WO2021022598A1

WO2021022598A1 - Illuminator for close-up photography, and imaging device comprising same

Info

Publication number: WO2021022598A1
Application number: PCT/CN2019/104006
Authority: WO
Inventors: 曾绍群; 胡庆磊; 李宁; 李梦婷; 黄凯; 李亚武
Original assignee: 肯维捷斯（武汉）科技有限公司
Priority date: 2019-08-05
Filing date: 2019-09-02
Publication date: 2021-02-11
Also published as: CN110515258A

Abstract

An illuminator for close-up photography, and an imaging device comprising same. The illuminator comprises: a light guide (1), a small light source (2) and an illuminating circuit board (3); the light guide (1) is made of a transparent or semi-transparent material, the light guide (1) is arranged around the periphery of a camera module (4), the projections of the rear end of the light guide (1) and the camera module (4) partially overlap in length, the object-side end face of the light guide (1) extends forward beyond the object-side end face of the camera module (4), and the object-side end face of the light guide (1) comprises a light-emitting area (11); the small light source (2) is provided at the rear of the light guide (1) facing away from the object-side end face; and the illuminating circuit board (3) is a printed circuit board, and is electrically connected to the small light source (2). The invention can provide bright and uniform illumination for close-up photography, and avoid stray light interference caused by illuminating light directly entering the imaging lens during close-up illumination.

Description

一种近摄照明器及包含该照明器的成像设备Close-up illuminator and imaging equipment containing the illuminator

[技术领域][Technical Field]

本发明属于照明成像领域，具体涉及手机、相机等成像设备使用的适用于近距离拍摄的闪光灯或照明器，以及包含这类闪光灯或照明器的近摄成像设备。The present invention belongs to the field of lighting imaging, and specifically relates to a flashlight or illuminator suitable for close-up photography used by imaging devices such as mobile phones and cameras, and a close-up imaging device containing such flashlights or illuminators.

[背景技术][Background technique]

成像装置在生活中日渐普及，手机摄像头、电脑摄像头、行车记录仪、监控摄像头等成像装置每天都会在人们的日常生活中出现。成像也越来越朝着小型化方向发展，并且在小型化的同时仍能保持较高的成像质量。除了人像、风景等拍照需求外，人们也存在对近距离物体进行拍照的需求。以手机为例，近年出现了具备微距照明功能的型号，部分机型出现了专用于微距拍照的微距镜头。Imaging devices are becoming more and more popular in life, and imaging devices such as mobile phone cameras, computer cameras, driving recorders, and surveillance cameras appear in people's daily lives every day. Imaging is also developing toward miniaturization, and it can still maintain high imaging quality while miniaturizing. In addition to the demand for taking pictures of portraits and landscapes, people also need to take pictures of close objects. Take mobile phones as an example. In recent years, models with macro lighting have appeared, and some models have a macro lens dedicated to macro photography.

照明器用于在拍摄中补充照明，也称闪光灯。但现有的照明器多位于镜头的一侧，在远距离拍摄时尚有较好效果，在近距离拍摄时会出现照明不足、照明不均匀的情况。虽然也有环形的外接照明器(闪光灯)，但现有的环形照明器多针对的还是中距离拍摄需要，当拍摄物体到镜头的距离较近，例如在50mm以内时，现有的外接环形照明器无法有效的提供明亮、均匀、柔和的照明。The illuminator is used to supplement the lighting during shooting, and is also called a flash. However, most of the existing illuminators are located on one side of the lens, and they have better effects in long-distance shooting fashion, and insufficient lighting and uneven lighting may occur when shooting at close distances. Although there are also ring-shaped external illuminators (flash lights), the existing ring illuminators are mostly aimed at medium-distance shooting. When the distance between the shooting object and the lens is relatively short, such as within 50mm, the existing external ring illuminator Can not effectively provide bright, uniform and soft lighting.

另一方面，现有的微距摄像头多使用将照相镜头的像距增长的方式实现微距。由于一般照相镜头是针对远距离成像的，在微距情况下成像效果不佳，即使进行增距也只能增大放大率但无法获得足够的分辨率。On the other hand, the existing macro cameras mostly use the method of increasing the image distance of the camera lens to achieve macro. Since the general camera lens is aimed at long-distance imaging, the imaging effect is not good in the case of macro. Even if the distance is increased, it can only increase the magnification but cannot obtain sufficient resolution.

[发明内容][Summary of the invention]

针对现有技术以上缺陷或改进需求中的至少一种，本发明提供了一种近摄照明器，能够为近距离拍摄提供明亮、均匀的照明，避免近距离照明时照明光直接进入成像镜头引起杂散光干扰。In view of at least one of the above-mentioned defects or improvement requirements of the prior art, the present invention provides a close-up illuminator, which can provide bright and uniform illumination for close-range shooting, and avoid the direct entry of illumination light into the imaging lens during close-range illumination. Stray light interference.

为实现上述目的，按照本发明的一个方面，提供了一种近摄照明器，其中：包括光导、小型光源和照明电路板；To achieve the above objective, according to one aspect of the present invention, a close-up illuminator is provided, which includes a light guide, a small light source, and an illumination circuit board;

所述光导为透明或半透明材料，所述光导环绕设置在摄像头模组的***，所述光导的后端与所述摄像头模组存在部分长度投影叠合，且所述光导的物方端面向前超过所述摄像头模组的物方端面，所述光导的物方端面包含出光区域；The light guide is made of transparent or semi-transparent material, the light guide is arranged around the periphery of the camera module, the rear end of the light guide and the camera module have a partial length projection overlap, and the object end of the light guide faces The front side exceeds the object side of the camera module, and the object side of the light guide includes a light exit area;

所述小型光源设置在所述光导背向其物方端面的后方；The small light source is arranged behind the end surface of the light guide facing away from the object;

所述照明电路板为印制电路板，与所述小型光源具备电路连接。The lighting circuit board is a printed circuit board, and has a circuit connection with the small light source.

优选地，所述光导的物方端面向前超过所述摄像头模组的物方端面的距离S ₁₁满足0.1mm≤S ₁₁≤3mm。 Preferably, the light guide end surface forwardly beyond the object side of the camera module from the object side end surface S ₁₁ satisfy 0.1mm≤S ₁₁ ≤3mm.

优选地，所述光导的物方端面的法向平行于所述摄像头模组的光轴。Preferably, the normal direction of the object end surface of the light guide is parallel to the optical axis of the camera module.

优选地，所述光导的物方端面包含一个向所述摄像头模组倾斜的倒角；Preferably, the object end surface of the light guide includes a chamfer that is inclined to the camera module;

倒角的内侧端至少平齐所述摄像头模组的物方端面，倒角的外侧端向前超过所述摄像头模组的物方端面的距离即为所述S ₁₁。 The inner end of the chamfer is at least flush with the object end surface of the camera module, and the distance that the outer end of the chamfer forward exceeds the object end surface of the camera module is the S ₁₁ .

优选地，所述光导的物方内径小于其像方内径，即所述光导半包裹住所述摄像头模组的物方端面。Preferably, the object side inner diameter of the light guide is smaller than its image side inner diameter, that is, the light guide half-wraps the object side end surface of the camera module.

优选地，所述光导的物方端面包含一个向所述摄像头模组倾斜的圆角；Preferably, the object end surface of the light guide includes a rounded corner inclined to the camera module;

圆角的内侧端至少平齐所述摄像头模组的物方端面，圆角的外侧端向前超过所述摄像头模组的物方端面的距离即为所述S ₁₁； The inner end of the rounded corner is at least flush with the object end surface of the camera module, and the distance that the outer end of the rounded corner forwards beyond the object end surface of the camera module is the S ₁₁ ;

或者，所述光导的物方端面包含一个倾向所述摄像头模组的阶梯；Or, the object end surface of the light guide includes a step inclined to the camera module;

阶梯的内侧端至少平齐所述摄像头模组的物方端面，阶梯的外侧端向前超过所述摄像头模组的物方端面的距离即为所述S ₁₁； The inner end of the step is at least flush with the object end surface of the camera module, and the distance that the outer end of the step forwards beyond the object end surface of the camera module is the S ₁₁ ;

或者，所述光导的物方端面包含一个弧形凸起；Alternatively, the object end surface of the light guide includes an arc-shaped protrusion;

弧形凸起内后端至少平齐所述摄像头模组的物方端面，弧形凸起的最前端向前超过所述摄像头模组的物方端面的距离即为所述S ₁₁。 The inner and rear ends of the arc-shaped protrusions are at least flush with the object end surface of the camera module, and the distance that the most front end of the arc-shaped protrusions forwards beyond the object end surface of the camera module is the S ₁₁ .

优选地，所述光导为中空圆柱体、中空矩形体、中空锥体或为环绕所述摄像头模组分布的多个分离的形体；Preferably, the light guide is a hollow cylinder, a hollow rectangular body, a hollow cone, or a plurality of separate shapes distributed around the camera module;

当所述光导为中空锥体时，其物方锥径小于像方锥径；所述光导的物方端面与所述摄像头模组的物方端面呈一个钝角。When the light guide is a hollow cone, its object side cone diameter is smaller than the image side cone diameter; the object side end surface of the light guide and the object side end surface of the camera module form an obtuse angle.

优选地，所述小型光源位于所述光导的像方端面，所述小型光源的发光面朝向所述光导的物方；Preferably, the small light source is located on the image side end surface of the light guide, and the light emitting surface of the small light source faces the object side of the light guide;

或者，所述小型光源位于所述光导的外侧，所述小型光源的发光面向内侧朝向所述光导；Alternatively, the small light source is located outside the light guide, and the light emitting surface of the small light source faces the light guide inward;

或者，所述小型光源包含在所述光导的像方端内部，所述小型光源的发光面朝向所述光导的物方。Alternatively, the small light source is contained inside the image side end of the light guide, and the light emitting surface of the small light source faces the object side of the light guide.

优选地，所述照明电路板集成于所述近摄照明器所应用的设备的主板上，作为设备主板的一部分，并受设备主板上的控制器所控制；Preferably, the lighting circuit board is integrated on the main board of the device to which the close-up illuminator is applied, as a part of the main board of the device, and is controlled by a controller on the main board of the device;

或者，所述照明电路板集成于所述摄像头模组的电路板上，与摄像头模组构成一个整体；Alternatively, the lighting circuit board is integrated on the circuit board of the camera module to form a whole with the camera module;

或者，所述照明电路板为独立的电路板，与所述近摄照明器所应用的设备的主板通过连接器构成电路连接。Alternatively, the lighting circuit board is an independent circuit board, and is connected to the main board of the device to which the close-up illuminator is applied through a connector to form a circuit.

为实现上述目的，按照本发明的另一方面，还提供了一种近摄成像设备，通过使用独特的镜头设计，并确定了镜头与感光芯片之间的位置关系，构造了一种摄像头模组，其中镜头感光芯片的位置关系满足公式1，该构造有利于减少在近距离成像时镜头的像方端面到感光芯片的距离，避免采用增距方式实现近距离拍照，利于结构的小型化。同时，镜头包含前透镜组和后透镜组，构造成复合显微镜的结构，此时前透镜组等效为物镜，能够获取优秀的成像质量；In order to achieve the above objective, according to another aspect of the present invention, a close-up imaging device is provided. By using a unique lens design and determining the positional relationship between the lens and the photosensitive chip, a camera module is constructed Wherein, the positional relationship of the photosensitive chip of the lens satisfies formula 1. This structure is beneficial to reduce the distance from the image side end surface of the lens to the photosensitive chip when imaging at close range, avoiding the use of an increase in distance to realize close-range photography, and is beneficial to the miniaturization of the structure. At the same time, the lens includes a front lens group and a rear lens group, and is constructed into a compound microscope structure. At this time, the front lens group is equivalent to an objective lens, which can obtain excellent imaging quality;

其中：among them:

包含摄像头模组和如前所述的近摄照明器；Including the camera module and the close-up illuminator as mentioned above;

所述摄像头模组包括镜头模块、外壳、底板和感光芯片；The camera module includes a lens module, a housing, a bottom plate and a photosensitive chip;

所述外壳用于固定所述镜头模块和所述底板；The housing is used to fix the lens module and the bottom plate;

所述底板上安装有所述感光芯片；The photosensitive chip is mounted on the bottom plate;

光轴上物点到镜头模块的物方主面的距离小于40mm时的聚焦像点的均方差半径小于光轴上物点位于无穷远处时的聚焦像点的均方差半径；When the distance from the object point on the optical axis to the main surface of the lens module is less than 40mm, the mean square error radius of the focused image point is smaller than the mean square error radius of the focused image point when the object point on the optical axis is located at infinity;

所述镜头模块沿着光轴的物侧至像侧依次包括：第一透镜组、光圈、第二透镜组；The lens module includes in order from the object side to the image side along the optical axis: a first lens group, an aperture, and a second lens group;

所述第一透镜组和第二透镜组均为正光焦度；所述第一透镜组的物方通光口径大于其像方通光口径，所述第二透镜组的物方通光口径小于其像方通光口径；The first lens group and the second lens group both have positive refractive power; the object-side light-passing aperture of the first lens group is larger than the image-side light-passing aperture, and the object-side light-passing aperture of the second lens group is smaller than the image-side light-passing aperture;

所述镜头模块和所述感光芯片的感光面的位置关系满足如下条件：The positional relationship between the lens module and the photosensitive surface of the photosensitive chip meets the following conditions:

0.5f ₂₀₀<S _ima<1.5f ₂₀₀ (公式1)； 0.5f ₂₀₀ <S _ima <1.5f ₂₀₀ (Formula 1);

其中f ₂₀₀为第二透镜组的焦距，即第二透镜组的像方主面到第二透镜组的像方焦面的距离，S _ima为感光芯片的感光面到第二透镜组的像方主面的距离。 Where f ₂₀₀ is the focal length of the second lens group, that is, the distance from the main image side of the second lens group to the image side focal surface of the second lens group, and S _ima is the photosensitive surface of the photosensitive chip to the image side of the second lens group The distance to the main surface.

优选地，所述摄像头模组还包括滤光片；Preferably, the camera module further includes a filter;

所述滤光片安装在所述感光芯片的物方侧，固定于所述外壳上；The filter is installed on the object side of the photosensitive chip and fixed on the housing;

第二透镜组的像方主面到第二透镜组的像方焦面位置为考虑所述滤光片的折射效应之后的位置。The position of the image side principal surface of the second lens group to the image side focal surface of the second lens group is a position after considering the refraction effect of the filter.

优选地，所述摄像头模组还包括调焦马达；Preferably, the camera module further includes a focusing motor;

所述调焦马达用于使镜头模块相对于外壳运动，在所述镜头模块的调焦范围内，公式1均成立。The focusing motor is used to move the lens module relative to the housing, and within the focusing range of the lens module, Formula 1 is all established.

优选地，所述调焦马达为音圈马达或超声波马达。Preferably, the focusing motor is a voice coil motor or an ultrasonic motor.

优选地，所述摄像头模组还包括磁铁、前弹簧垫、后弹簧垫、线圈；Preferably, the camera module further includes a magnet, a front spring pad, a rear spring pad, and a coil;

所述磁铁和线圈构成所述调焦马达；The magnet and the coil constitute the focusing motor;

所述磁铁固定于所述外壳的内壁，所述前弹簧垫和后弹簧垫用于限制所述镜头模块的移动位置，所述线圈与所示镜头模块的外壁固定。The magnet is fixed to the inner wall of the housing, the front spring pad and the rear spring pad are used to limit the moving position of the lens module, and the coil is fixed to the outer wall of the lens module.

优选地，所述摄像头模组不具备调焦功能，所述镜头模块与所述感光芯片之间的距离为定值；Preferably, the camera module does not have a focusing function, and the distance between the lens module and the photosensitive chip is a fixed value;

不同规格的所述摄像头模组产生系列不同的定值，但均满足公式1。The camera modules of different specifications produce a series of different fixed values, but all satisfy formula 1.

优选地，当所述摄像头模组不具备调焦功能时，所述镜头模块和所述感光芯片的感光面的位置关系满足如下条件：Preferably, when the camera module does not have a focusing function, the positional relationship between the lens module and the photosensitive surface of the photosensitive chip meets the following conditions:

S _ima＝f ₂₀₀ (公式2)。 S _ima =f ₂₀₀ (Equation 2).

优选地，所述第一透镜组的像方介质和所述第二透镜组的物方介质为空气；Preferably, the image side medium of the first lens group and the object side medium of the second lens group are air;

所述光圈位于所述第一透镜组或所述第二透镜组的表面，或其物方、像方的空气介质中。The aperture is located on the surface of the first lens group or the second lens group, or in the air medium on the object side or the image side.

优选地，所述第一透镜组的像方介质和所述第二透镜组的物方介质为包括塑料或玻璃在内的透明材质；Preferably, the image-side medium of the first lens group and the object-side medium of the second lens group are transparent materials including plastic or glass;

此时，所述第一透镜组和所述第二透镜组有共同的一片透镜，该透镜的物方的所有透镜和该透镜的物方表面构成第一透镜组，该透镜的像方表面和其像方的所有透镜构成第二透镜组；At this time, the first lens group and the second lens group have a common lens, all the lenses of the object side of the lens and the object surface of the lens constitute the first lens group, and the image side surface of the lens is All the lenses on the image side constitute the second lens group;

所述光圈位于该透镜的表面或该透镜的透明介质内。The aperture is located on the surface of the lens or in the transparent medium of the lens.

优选地，所述摄像头模组是用于便携式电子产品的摄像头模组。Preferably, the camera module is a camera module for portable electronic products.

优选地，所述第一透镜组的焦距f ₁₀₀≤40mm，所述第二透镜组的焦距f ₂₀₀≤20mm； Preferably, the focal length of the first lens group f ₁₀₀ ≤ 40 mm, and the focal length of the second lens group f ₂₀₀ ≤ ₂₀ mm;

在使用时，待摄物体与所述第一透镜组的物方主面的距离od ₁₀₀小于第一透镜组100的焦距的2倍，即 In use, the distance od ₁₀₀ between the object to be photographed and the main surface of the first lens group is less than 2 times the focal length of the first lens group 100, namely

od ₁₀₀<2f ₁₀₀ (关系式1)； od ₁₀₀ <2f ₁₀₀ (relation 1);

且所述第二透镜组的像方主面到像面的距离id ₂₀₀小于所述第二透镜组的焦距的两倍，即 And the distance id ₂₀₀ from the main image side of the second lens group to the image surface is less than twice the focal length of the second lens group, that is

id ₂₀₀<2f ₂₀₀ (关系式2)； id ₂₀₀ <2f ₂₀₀ (relation 2);

且所述第一透镜组的像方数值孔径(numerical aperture)NA _img100、所述第二透镜组的物方数值孔径NA _obj200满足如下条件： And the image-side numerical aperture (numerical aperture) NA _img100 of the first lens group and the object-side numerical aperture NA _{obj200 of} the second lens group satisfy the following conditions:

0<NA _img100，NA _obj200<0.05 (关系式3)。 0<NA _img100 , NA _obj200 <0.05 (relationship 3).

优选地，所述光圈到所述第一透镜组的边缘沿光轴方向的距离sd ₁₀₀满足关系式： Preferably, the distance sd ₁₀₀ from the aperture to the edge of the first lens group along the optical axis direction satisfies the relationship:

sd ₁₀₀<f ₁₀₀ (关系式4)； sd ₁₀₀ <f ₁₀₀ (relation 4);

所述光圈到所述第二透镜组的边缘沿光轴方向的距离sd ₂₀₀满足关系式： The distance sd ₂₀₀ from the aperture to the edge of the second lens group along the optical axis direction satisfies the relationship:

sd ₂₀₀<f ₂₀₀ (关系式5)。 sd ₂₀₀ <f ₂₀₀ (relation 5).

优选地，所述第二透镜组沿着光轴的物侧至像侧依序包括至少三个透镜。Preferably, the second lens group includes at least three lenses in sequence from the object side to the image side along the optical axis.

优选地，所述第二透镜组沿着光轴的物侧至像侧依序设置的最后两片透镜设置如下：Preferably, the last two lenses of the second lens group arranged in sequence from the object side to the image side of the optical axis are arranged as follows:

倒数第二片透镜的像方表面为凸面，且其物方表面和像方表面中至少一表面为非球面；The image side surface of the penultimate lens is convex, and at least one of the object side surface and the image side surface is aspherical;

最后一片透镜的物方表面和像方表面均为凹面，且其物方表面和像方表面中至少一表面为非球面。The object side surface and the image side surface of the last lens are both concave, and at least one of the object side surface and the image side surface is aspherical.

最后一片透镜的物方表面为凸面，像方表面为凹面，其物方表面和像方表面中至少一表面为非球面，且具有一个中心厚度最小、越离轴厚度越大的区域。The object surface of the last lens is convex, the image surface is concave, and at least one of the object surface and the image surface is aspherical, and has an area with the smallest center thickness and the greater the thickness from the axis.

倒数第二片透镜的物方表面为凹面，像方表面为凸面，且其物方表面和像方表面中至少一表面为非球面；The object side surface of the penultimate lens is concave, the image side surface is convex, and at least one of the object side surface and the image side surface is aspherical;

最后一片透镜的物方表面为凹面，像方表面为凸面，且其物方表面和像方表面中至少一表面为非球面。The object side surface of the last lens is concave, the image side surface is convex, and at least one of the object side surface and the image side surface is aspherical.

最后一片透镜的物方表面为凸面，像方表面为凹面，其物方表面和像方表面中至少一表面为非球面，且具有一个中心厚度最大、越离轴厚度越小的区域。The object-side surface of the last lens is convex, the image-side surface is concave, and at least one of the object-side surface and the image-side surface is aspherical, and has an area with the largest center thickness and the smaller the thickness away from the axis.

优选地，所述最后一片透镜的物方表面和像方表面中至少一表面具有一反曲点。Preferably, at least one of the object side surface and the image side surface of the last lens has an inflection point.

优选地，所述第二透镜组沿着光轴的物侧至像侧依序包括：Preferably, the second lens group includes in order from the object side to the image side along the optical axis:

第一片透镜，其物方表面和像方表面均为凸面；For the first lens, both the object side surface and the image side surface are convex;

第二片透镜，其物方表面和像方表面均为凹面；The second lens, whose object side surface and image side surface are both concave;

第三片透镜，其物方表面的中心为凸面，然后离轴***变为凹面，像方表面中心为凹面，然后离轴***变为凸面；For the third lens, the center of the object side surface is convex, then the off-axis periphery becomes concave, the center of the image side surface is concave, and then the off-axis periphery becomes convex;

第四片透镜的像方表面为凸面，且其物方表面和像方表面中至少一表面为非球面；The image side surface of the fourth lens is convex, and at least one of the object side surface and the image side surface is aspherical;

第五片透镜的物方表面和像方表面均为凹面，且其物方表面和像方表面中至少一表面为非球面。The object side surface and the image side surface of the fifth lens are both concave, and at least one of the object side surface and the image side surface is aspherical.

第二片透镜，其物方表面和像方表面均为凹面，其中物方表面凹陷程度大于像方表面，且像方表面具有反曲点；The second lens, the object side surface and the image side surface are both concave, wherein the object side surface is more concave than the image side surface, and the image side surface has an inflection point;

第三片透镜，其像方表面为凸面，且其物方表面和像方表面中至少一表面为非球面；For the third lens, the image side surface is convex, and at least one of the object side surface and the image side surface is aspherical;

第四片透镜，其物方表面为凸面，像方表面为凹面，其物方表面和像方表面中至少一表面为非球面，且具有一个中心厚度最小、越离轴厚度越大的区域。The fourth lens has a convex object surface and a concave image surface. At least one of the object surface and the image surface is aspherical, and has an area with the smallest center thickness and the greater the thickness off the axis.

第二片透镜，其物方表面为凸面，像方表面为凹面；The second lens has a convex surface on the object side and a concave surface on the image side;

第四片透镜，其物方表面为凹面，像方表面为凸面；The fourth lens has a concave surface on the object side and a convex surface on the image side;

第五片透镜，其物方表面为凹面，像方表面为凸面，且其物方表面和像方表面中至少一表面为非球面；The fifth lens, the object side surface is concave, the image side surface is convex, and at least one of the object side surface and the image side surface is aspherical;

第六片透镜，其物方表面为凹面，像方表面为凸面，且其物方表面和像方表面中至少一表面为非球面。For the sixth lens, the object side surface is concave, the image side surface is convex, and at least one of the object side surface and the image side surface is aspherical.

第二片透镜，其像方表面为凸面，且其物方表面和像方表面中至少一表面为非球面；For the second lens, the image side surface is convex, and at least one of the object side surface and the image side surface is aspherical;

第三片透镜，其物方表面为凸面，像方表面为凹面，其物方表面和像方表面中至少一表面为非球面，且具有一个中心厚度最大、越离轴厚度越小的区域。The third lens has a convex surface on the object side and a concave surface on the image side. At least one of the object side and image side surfaces is aspherical, and has an area with the largest center thickness and smaller thickness away from the axis.

优选地，所述第一透镜组沿着光轴的物侧至像侧依序包括至少三个透镜。Preferably, the first lens group includes at least three lenses in sequence from the object side to the image side along the optical axis.

优选地，所述第一透镜组沿着光轴的物侧至像侧依序设置的前两片透镜设置如下：Preferably, the first two lenses of the first lens group arranged in sequence from the object side to the image side of the optical axis are arranged as follows:

第一片透镜的物方表面和像方表面均为凹面，且其物方表面和像方表面中至少一表面为非球面；Both the object side surface and the image side surface of the first lens are concave, and at least one of the object side surface and the image side surface is aspherical;

第二片透镜的像方表面为凸面，且其物方表面和像方表面中至少一表面为非球面。The image side surface of the second lens is convex, and at least one of the object side surface and the image side surface is aspherical.

第一片透镜的物方表面为凹面，像方表面为凸面，其物方表面和像方表面中至少一表面为非球面，且具有一个中心厚度最大、越离轴厚度越小的区域；The object-side surface of the first lens is concave, the image-side surface is convex, and at least one of the object-side surface and the image-side surface is aspherical, and has an area with the largest center thickness and the smaller the thickness away from the axis;

第二片透镜的物方表面为凸面，像方表面为凹面，且其物方表面和像方表面中至少一表面为非球面。The object side surface of the second lens is convex, the image side surface is concave, and at least one of the object side surface and the image side surface is aspherical.

第二片透镜的物方表面为凸面，且其物方表面和像方表面中至少一表面为非球面。The object-side surface of the second lens is convex, and at least one of the object-side surface and the image-side surface is aspherical.

优选地，所述第一片透镜的物方表面和像方表面中至少一表面具有一反曲点。Preferably, at least one of the object side surface and the image side surface of the first lens has an inflection point.

优选地，所述第一透镜组沿着光轴的物侧至像侧依序包括：Preferably, the first lens group includes in order from the object side to the image side along the optical axis:

第一片透镜，其物方表面和像方表面均为凹面，且其物方表面和像方表面中至少一表面为非球面；For the first lens, the object side surface and the image side surface are both concave, and at least one of the object side surface and the image side surface is aspherical;

第二片透镜，其物方表面为凸面，像方表面为凹面，且其物方表面和像方表面中至少一表面为非球面，且具有一个中心厚度最大、越离轴厚度越小的区域；The second lens has a convex surface on the object side and a concave surface on the image side, and at least one of the object side surface and the image side surface is aspherical, and has an area with the largest center thickness and the smaller the thickness off the axis ；

第三片透镜，其物方表面为凹面，但凹陷程度小于第一片透镜的物方表面凹陷程度，像方表面为凹面；The third lens, the object side surface of which is concave, but the degree of recession is smaller than the degree of recession of the object side surface of the first lens, and the image side surface is concave;

第四片透镜，其物方表面和像方表面均为凸面。The fourth lens has a convex surface on the object side and image side.

第一片透镜，其物方表面为凹面，像方表面为凸面，其物方表面和像方表面中至少一表面为非球面，且具有一个中心厚度最大、越离轴厚度越小的区域；The first lens has a concave object surface, a convex image surface, and at least one of the object surface and the image surface is aspherical, and has an area with the largest center thickness and the smaller the thickness off the axis;

第二片透镜，其物方表面为凸面，像方表面为凹面，且其物方表面和像方表面中至少一表面为非球面；The second lens, the object side surface is convex, the image side surface is concave, and at least one of the object side surface and the image side surface is aspherical;

第三片透镜，其物方表面和像方表面均为凸面。The third lens has a convex surface on the object side and image side.

第二片透镜，其物方表面为凸面，像方表面均为凹面，且其物方表面和像方表面中至少一表面为非球面，且具有一个中心厚度最大、越离轴厚度越小的区域；The second lens has a convex surface on the object side and a concave surface on the image side, and at least one of the object side and image side surfaces is aspherical, and has a center with the largest thickness and the smaller the thickness off the axis area;

第三片透镜，其物方表面为凹面，但凹陷程度小于第一片透镜的物方表面的凹陷程度，像方表面为凸面；For the third lens, the object surface is concave, but the degree of depression is smaller than that of the object surface of the first lens, and the image surface is convex;

第四片透镜，其物方表面和像方表面均为凹面；The fourth lens, whose object side surface and image side surface are both concave;

第五片透镜，其物方表面和像方表面均为凸面。For the fifth lens, both the object side surface and the image side surface are convex.

上述优选技术特征只要彼此之间未构成冲突就可以相互组合。The above-mentioned preferred technical features can be combined with each other as long as they do not conflict with each other.

总体而言，通过本发明所构思的以上技术方案与现有技术相比，具有以下有益效果：Generally speaking, compared with the prior art, the above technical solutions conceived by the present invention have the following beneficial effects:

1、本发明的近摄照明器，能够为近距离拍摄提供明亮、均匀的照明，避免近距离照明时照明光直接进入成像镜头引起杂散光干扰。1. The close-up illuminator of the present invention can provide bright and uniform illumination for close-range shooting, and avoid stray light interference caused by illuminating light directly entering the imaging lens during close-range illumination.

2、本发明的近摄照明器，功能是为摄像头提供照明，使用时，本发明光导环绕摄像头模组，光导的物方端面超过摄像头模组的物方端面，优选超出的距离S ₁₁满足0.1mm≤S ₁₁≤3mm，该结构有利于出光区域对摄像头模组物方的近距离区域进行照明，避免摄像头模组的外壳遮挡光导致其物方的近距离区域的中心区域照明不足；优选的，光导的出光区域超出摄像头模组的部分包含一个锥面或环面，该结构有利于引导照明光由出光区域出射后射向摄像头模组的物方，避免有大量照明光未照射向摄像头模组的物方的物体而是直接进入摄像头模组从而引起杂散光干扰成像。 2. The close-up illuminator of the present invention functions to provide illumination for the camera. When in use, the light guide of the present invention surrounds the camera module, and the object end face of the light guide exceeds the object end face of the camera module, and the distance S ₁₁ preferably exceeds 0.1 mm≤S ₁₁ ≤3mm, this structure is conducive to the light-emitting area to illuminate the close-range area of the camera module, avoiding the housing of the camera module to block light and cause insufficient illumination of the central area of the close-range area of the object; preferred The part of the light guide beyond the camera module includes a cone or torus. This structure is beneficial to guide the illuminating light from the light exit area to the object side of the camera module, avoiding a large amount of illuminating light not irradiating the camera module The objects in the group's object side directly enter the camera module and cause stray light to interfere with imaging.

3、本发明的近摄照明器，其光导具有独特的构造，光导的物方端面可包含倒角、圆角、弧形凸起，也可包含台阶；光导可为中空圆柱体、中空矩形体、中空锥体或其他中空三维形体，也可为环绕摄像头模组分布的多个分离的形体。3. In the close-up illuminator of the present invention, the light guide has a unique structure. The object side of the light guide can include chamfers, rounded corners, arc-shaped protrusions, or steps; the light guide can be a hollow cylinder or a hollow rectangular body. , Hollow cones or other hollow three-dimensional bodies, may also be multiple separate bodies distributed around the camera module.

4、本发明的近摄照明器，小型光源的设置带来了更明亮、均匀的照明，小型光源位于光导的像侧、外侧或内侧；小型光源为发光器件，小型光源选用发光二极管(light emitting diode，LED)或激光二极管(LASER diode，LD)；小型光源的数量为2～4个；当存在多个小型光源时，小型光源环绕摄像头模组；当存在多个小型光源，小型光源等间隔分布环绕摄像头模组。4. In the close-up illuminator of the present invention, the setting of a small light source brings brighter and uniform illumination. The small light source is located on the image side, outside or inside of the light guide; the small light source is a light-emitting device, and the small light source is a light emitting diode. diode, LED) or laser diode (LD); the number of small light sources is 2 to 4; when there are multiple small light sources, the small light source surrounds the camera module; when there are multiple small light sources, the small light sources are equally spaced Distribute surround camera modules.

5、现有技术中，感光芯片的感光面位于镜头的焦面上；存在调焦功能时，感光芯片的感光面在调焦范围内位于镜头的一倍焦距到两倍焦距所确定的两个平面之间。本发明的近摄成像设备与现有技术不同，镜头与感光芯片的位置关系满足关系式，该构造有利于减少在近距离成像时镜头的像方端面到感光芯片的距离，避免采用增距方式实现近距离拍照，利于结构的小型化。5. In the prior art, the photosensitive surface of the photosensitive chip is located on the focal plane of the lens; when there is a focus adjustment function, the photosensitive surface of the photosensitive chip is located within the focus range of the lens from one to two times the focal length of the lens. Between planes. The close-up imaging device of the present invention is different from the prior art in that the positional relationship between the lens and the photosensitive chip satisfies the relational expression. This structure is beneficial to reduce the distance from the image side end surface of the lens to the photosensitive chip when imaging at close range, and avoids the use of an increase in distance. The realization of close-range photography is conducive to the miniaturization of the structure.

6、如前所述，本发明的近摄成像设备的构造可避免通过增距方式实现近距离拍照，从而使模组的结构更加紧凑，减少像方空气介质的总厚度从而避免浪费空间。在此基础上，节省下来的空间可用于在镜头中增加镜片数量，从而使得镜头获得更加丰富的像差校正自由度，以实现更高的光学分辨率和更低的畸变。6. As mentioned above, the structure of the close-up imaging device of the present invention can avoid realizing close-up photography by increasing the distance, thereby making the structure of the module more compact, reducing the total thickness of the image-side air medium and avoiding wasting space. On this basis, the saved space can be used to increase the number of lenses in the lens, so that the lens can obtain a richer degree of freedom in aberration correction to achieve higher optical resolution and lower distortion.

7、本发明的近摄成像设备中，镜头包含第一透镜组和第二透镜组，构造成复合显微镜的结构，此时第一透镜组等效为物镜，该结构有利于在近距离成像下获取优秀的成像质量。7. In the close-up imaging device of the present invention, the lens includes a first lens group and a second lens group, and is constructed into a structure of a compound microscope. At this time, the first lens group is equivalent to an objective lens. This structure is conducive to imaging at close range Obtain excellent image quality.

8、本发明的近摄成像设备中，镜头中光圈位于中间位置，光圈中置的构造有利于减少成像时的横向色差，也有利于实现大视场角成像。8. In the close-up imaging device of the present invention, the aperture in the lens is in the middle position, and the structure of the aperture in the middle is beneficial to reduce the lateral chromatic aberration during imaging, and is also beneficial to realize imaging with a large field of view.

9、本发明的近摄成像设备中，在成像过程中，镜头的第一透镜组处于物距小像距大的状态，第二透镜组处于物距大像距小的状态，此时第一透镜组和第二透镜组相互之间存在安装误差时，安装误差尤其是距离误差远小于第一透镜组的像距和第二透镜组的物距，从而使得安装误差对成像质量的影响较小，有利于减少成像质量对安装误差的敏感度，从而获取较高的良品率。9. In the close-up imaging device of the present invention, during the imaging process, the first lens group of the lens is in the state of small object distance and large image distance, and the second lens group is in the state of large object distance and small image distance. When there is an installation error between the lens group and the second lens group, the installation error, especially the distance error, is much smaller than the image distance of the first lens group and the object distance of the second lens group, so that the installation error has less influence on the image quality , Which is beneficial to reduce the sensitivity of imaging quality to installation errors, thereby obtaining a higher yield.

10、传统微型镜头多为照相镜头，针对物距远大于像距的情况所设计，不适用于近距离的微距和显微成像；本发明的近摄成像设备，提出了一种由第一透镜组、光圈和第二透镜组组成的三明治结构的镜头构型，能在小型化的情况下获取较高的近距离成像效果，能有效降低近距离成像时的像差，尤其是畸变和色差。满足本发明的的结构特征和参数关系式的镜头，能有效减少镜头的直径，减小镜头尺寸和降低加工难度和加工成本，并能有效减少有镜头和探测器组成的结构的总光学筒长。10. Traditional miniature lenses are mostly photographic lenses, which are designed for the situation where the object distance is far greater than the image distance, and are not suitable for close-up macro and microscopic imaging; the close-up imaging device of the present invention proposes a first The lens configuration of the sandwich structure composed of the lens group, the aperture and the second lens group can obtain high close-range imaging effect under the condition of miniaturization, and can effectively reduce the aberrations during close-range imaging, especially distortion and chromatic aberration . The lens that satisfies the structural features and parameter relational expressions of the present invention can effectively reduce the diameter of the lens, reduce the size of the lens, reduce the processing difficulty and processing cost, and can effectively reduce the total optical barrel length of the structure composed of the lens and the detector .

[附图说明][Description of drawings]

图1为本发明的近摄照明器的第一实施例的结构示意图；Fig. 1 is a schematic structural diagram of a first embodiment of a close-up illuminator of the present invention;

图2为本发明的近摄照明器的第二实施例的结构示意图；2 is a schematic structural diagram of a second embodiment of the close-up illuminator of the present invention;

图3为本发明的近摄照明器的第二实施例的三维结构示意图；3 is a schematic diagram of the three-dimensional structure of the second embodiment of the close-up illuminator of the present invention;

图4为本发明的近摄照明器的第三实施例的结构示意图；4 is a schematic structural diagram of a third embodiment of the close-up illuminator of the present invention;

图5为本发明的近摄照明器的第四实施例的结构示意图；5 is a schematic structural diagram of a fourth embodiment of the close-up illuminator of the present invention;

图6为本发明的近摄照明器的第五实施例的结构示意图；6 is a schematic structural diagram of a fifth embodiment of the close-up illuminator of the present invention;

图7a为本发明的近摄照明器的光导的物方端面的第一种形状；Fig. 7a is the first shape of the object end surface of the light guide of the close-up illuminator of the present invention;

图7b为本发明的近摄照明器的光导的物方端面的第二种形状；Fig. 7b is the second shape of the object end surface of the light guide of the close-up illuminator of the present invention;

图7c为本发明的近摄照明器的光导的物方端面的第三种形状；Fig. 7c is a third shape of the object end surface of the light guide of the close-up illuminator of the present invention;

图7d为本发明的近摄照明器的光导的物方端面的第四种形状；Fig. 7d is a fourth shape of the object end surface of the light guide of the close-up illuminator of the present invention;

图7e为本发明的近摄照明器的光导的物方端面的第五种形状；Fig. 7e is the fifth shape of the object end surface of the light guide of the close-up illuminator of the present invention;

图7f为本发明的近摄照明器的光导的物方端面的第六种形状；Fig. 7f is the sixth shape of the object end surface of the light guide of the close-up illuminator of the present invention;

图8为本发明的近摄照明器的光导的横截面的第一种形状；FIG. 8 is the first shape of the cross section of the light guide of the close-up illuminator of the present invention;

图9为本发明的近摄照明器的光导的横截面的第二种形状；Fig. 9 is a second cross-sectional shape of the light guide of the close-up illuminator of the present invention;

图10为本发明的近摄照明器的光导的横截面的第三种形状；Fig. 10 is a third shape of the cross section of the light guide of the close-up illuminator of the present invention;

图11是本发明的第一类近摄成像设备的示意图；Figure 11 is a schematic diagram of the first type of close-up imaging device of the present invention;

图12是本发明的第一类近摄成像设备的镜头模块的简要示意图；12 is a schematic diagram of the lens module of the first type close-up imaging device of the present invention;

图13是本发明的第一类近摄成像设备的镜头模块的结构示意图；13 is a schematic diagram of the structure of the lens module of the first type of close-up imaging device of the present invention;

图14是本发明的第二类近摄成像设备的示意图；Figure 14 is a schematic diagram of a second type of close-up imaging device of the present invention;

图15是本发明的近摄成像设备的结构示意图；15 is a schematic diagram of the structure of the close-up imaging device of the present invention;

图16是本发明的近摄成像设备的实施例一的结构示意图；16 is a schematic structural diagram of Embodiment 1 of the close-up imaging device of the present invention;

图17是本发明的近摄成像设备的实施例二的结构示意图；FIG. 17 is a schematic structural diagram of Embodiment 2 of the close-up imaging device of the present invention;

图18是本发明的近摄成像设备的实施例三的结构示意图；18 is a schematic structural diagram of Embodiment 3 of the close-up imaging device of the present invention;

图19是本发明的近摄成像设备的实施例四的结构示意图；19 is a schematic structural diagram of Embodiment 4 of the close-up imaging device of the present invention;

图20是本发明的近摄成像设备的实施例四的视场角内畸变示意图；20 is a schematic diagram of distortion within the field of view of Embodiment 4 of the close-up imaging device of the present invention;

图21是本发明的近摄成像设备的实施例五的结构示意图；21 is a schematic structural diagram of Embodiment 5 of the close-up imaging device of the present invention;

图22是本发明的近摄成像设备的实施例一的参数表图之一；22 is one of the parameter table diagrams of the first embodiment of the close-up imaging device of the present invention;

图23是本发明的近摄成像设备的实施例一的参数表图之二；FIG. 23 is a second parameter table diagram of Embodiment 1 of the close-up imaging device of the present invention;

图24是本发明的近摄成像设备的实施例二的参数表图之一；24 is one of the parameter table diagrams of the second embodiment of the close-up imaging device of the present invention;

图25是本发明的近摄成像设备的实施例二的参数表图之二；25 is the second parameter table diagram of the second embodiment of the close-up imaging device of the present invention;

图26是本发明的近摄成像设备的实施例三的参数表图之一；FIG. 26 is one of the parameter table diagrams of Embodiment 3 of the close-up imaging device of the present invention;

图27是本发明的近摄成像设备的实施例三的参数表图之二；Fig. 27 is the second parameter table diagram of the third embodiment of the close-up imaging device of the present invention;

图28是本发明的近摄成像设备的实施例四的参数表图之一；28 is one of the parameter table diagrams of the fourth embodiment of the close-up imaging device of the present invention;

图29是本发明的近摄成像设备的实施例四的参数表图之二；29 is the second parameter table diagram of the fourth embodiment of the close-up imaging device of the present invention;

图30是本发明的近摄成像设备的实施例五的参数表图之一；FIG. 30 is one of the parameter table diagrams of Embodiment 5 of the close-up imaging device of the present invention;

图31是本发明的近摄成像设备的实施例五的参数表图之二。Fig. 31 is the second parameter table diagram of the fifth embodiment of the close-up imaging device of the present invention.

[具体实施方式][detailed description]

为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。此外，下面所描述的本发明各个实施方式中所涉及到的技术特征只要彼此之间未构成冲突就可以相互组合。下面结合具体实施方式对本发明进一步详细说明。In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. The present invention will be further described in detail below in conjunction with specific embodiments.

作为本发明的一种较佳实施方式，如图1-10所示，本发明提供一种近摄照明器，其中：包括光导1、小型光源2和照明电路板3。As a preferred embodiment of the present invention, as shown in FIGS. 1-10, the present invention provides a close-up illuminator, which includes a light guide 1, a small light source 2 and an illumination circuit board 3.

所述光导1为透明或半透明材料，如透明塑料、玻璃等。本发明的功能是为摄像头提供照明，使用时，所述光导1环绕在摄像头模组4的***，定义朝向待拍摄物体的方向为物方，相反的方向为像方，所述光导1的后端与所述摄像头模组4存在部分长度投影叠合，且所述光导1的物方端面向前超过所述摄像头模组4的物方端面，优选地，所述光导1的物方端面向前超过所述摄像头模组4的物方端面的距离S ₁₁满足0.1mm≤S ₁₁≤3mm。所述摄像头模组4为包含成像镜头和面阵光电探测器的器件，所述摄像头模组4为本领域内技术人员所熟知，均可以使用本发明的近摄照明器，优选搭配本发明下文详细说明的摄像头模组一同使用。 The light guide 1 is made of transparent or semi-transparent material, such as transparent plastic, glass, etc. The function of the present invention is to provide illumination for the camera. When in use, the light guide 1 surrounds the periphery of the camera module 4, and defines the direction toward the object to be photographed as the object side, and the opposite direction is the image side. There is a partial length projection overlap between the camera module 4 and the camera module 4, and the object side of the light guide 1 forwards beyond the object side of the camera module 4. Preferably, the object side of the light guide 1 faces before exceeding the object side of the camera module from the end surface 4 of the S ₁₁ satisfy 0.1mm≤S ₁₁ ≤3mm. The camera module 4 is a device that includes an imaging lens and an area array photodetector. The camera module 4 is well known to those skilled in the art and can use the close-up illuminator of the present invention, preferably in combination with the following Use the camera module described in detail together.

所述光导1的物方端面包含出光区域11，所述出光区域11优选呈环状。本发明所述环形、环绕，均非限定所述结构的形状为圆形或圆环形，而是描述所述结构的特征为分布在另一结构四周。The object end surface of the light guide 1 includes a light emitting area 11, and the light emitting area 11 is preferably ring-shaped. The ring shape and surrounding of the present invention do not limit the shape of the structure to a circle or a circular ring shape, but describe that the structure is characterized as being distributed around another structure.

本发明的光导的物方端面形状和横截面形状具有多个不同的实施方式，如图1-4、图7a-图7f所示。The object end shape and cross-sectional shape of the light guide of the present invention have a number of different embodiments, as shown in FIGS. 1-4 and 7a-7f.

如图1、图7a所示，所述光导1的物方端面的法向平行于所述摄像头模组4的光轴。As shown in FIGS. 1 and 7a, the normal direction of the object end surface of the light guide 1 is parallel to the optical axis of the camera module 4.

如图2-3、图7b所示，所述光导1的物方端面包含一个向所述摄像头模组4倾斜的倒角；倒角的内侧端至少平齐所述摄像头模组4的物方端面，倒角的外侧端向前超过所述摄像头模组4的物方端面的距离即为所述S ₁₁。 As shown in Figures 2-3 and 7b, the object side of the light guide 1 includes a chamfer that is inclined toward the camera module 4; the inner end of the chamfer is at least flush with the object side of the camera module 4 For the end face, the distance that the outer end of the chamfer forward exceeds the object end face of the camera module 4 is the S ₁₁ .

如图4、图7c所示，所述光导1的物方内径小于其像方内径，即所述光导1半包裹住所述摄像头模组4的物方端面。As shown in FIGS. 4 and 7c, the object-side inner diameter of the light guide 1 is smaller than its image-side inner diameter, that is, the light guide 1 half-wraps the object-side end surface of the camera module 4.

如图7d所示，所述光导1的物方端面包含一个向所述摄像头模组4倾斜的圆角；圆角的内侧端至少平齐所述摄像头模组4的物方端面，圆角的外侧端向前超过所述摄像头模组4的物方端面的距离即为所述S ₁₁。 As shown in Fig. 7d, the object end surface of the light guide 1 includes a rounded corner inclined to the camera module 4; the inner end of the rounded corner is at least flush with the object end surface of the camera module 4, and the rounded corner The distance that the outer end forwards beyond the object end surface of the camera module 4 is the S ₁₁ .

如图7e所示，所述光导1的物方端面包含一个倾向所述摄像头模组4的阶梯；阶梯的内侧端至少平齐所述摄像头模组4的物方端面，阶梯的外侧端向前超过所述摄像头模组4的物方端面的距离即为所述S ₁₁。 As shown in FIG. 7e, the object end surface of the light guide 1 includes a step inclined to the camera module 4; the inner end of the step is at least flush with the object end surface of the camera module 4, and the outer end of the step is forward The distance beyond the object end surface of the camera module 4 is the S ₁₁ .

如图7f所示，所述光导1的物方端面包含一个弧形凸起，优选为半圆形凸起；弧形凸起内后端至少平齐所述摄像头模组4的物方端面，弧形凸起的最前端向前超过所述摄像头模组4的物方端面的距离即为所述S ₁₁。 As shown in Fig. 7f, the object end surface of the light guide 1 includes an arc-shaped protrusion, preferably a semicircular protrusion; the inner and rear ends of the arc-shaped protrusion are at least flush with the object end surface of the camera module 4, The distance that the foremost end of the arc-shaped protrusion forwards beyond the object end surface of the camera module 4 is the S ₁₁ .

本发明的光导的横截面形状具有多个不同的实施方式，以展示光导1环绕摄像头模组4的不同方式，如图8a-图8c、图5所示。The cross-sectional shape of the light guide of the present invention has a number of different embodiments to show the different ways in which the light guide 1 surrounds the camera module 4, as shown in FIGS. 8a-8c and 5.

所述光导1为中空圆柱体、中空矩形体、中空锥体或为环绕所述摄像头模组4分布的多个分离的形体；图8a展示的是光导1横截面为中空矩形的情形。图8b展示的是光导1横截面为中空圆形的情形。图8c展示的是光导1的横截面为环绕分布的4个矩形，此时光导1为分离的4个条状体。The light guide 1 is a hollow cylinder, a hollow rectangular body, a hollow cone, or a plurality of separate shapes distributed around the camera module 4; FIG. 8a shows a case where the cross section of the light guide 1 is a hollow rectangle. Figure 8b shows the case where the cross section of the light guide 1 is hollow and circular. Fig. 8c shows that the cross section of the light guide 1 is 4 rectangles distributed around, and the light guide 1 is now 4 separate strips.

如图5所示，当所述光导1为中空锥体时，其物方锥径小于像方锥径；所述光导1的物方端面与所述摄像头模组4的物方端面呈一个钝角。As shown in FIG. 5, when the light guide 1 is a hollow cone, its object side cone diameter is smaller than the image side cone diameter; the object side end surface of the light guide 1 and the object side end surface of the camera module 4 form an obtuse angle .

所述小型光源2设置在所述光导1背向其物方端面的后方。The small light source 2 is arranged behind the end surface of the light guide 1 facing away from the object side.

优选地，所述小型光源2位于所述光导1的像方端面，所述小型光源2的发光面朝向所述光导1的物方；或者，所述小型光源2位于所述光导1的外侧，所述小型光源2的发光面向内侧朝向所述光导1；或者，所述小型光源2包含在所述光导1的像方端内部，所述小型光源2的发光面朝向所述光导1的物方。Preferably, the small light source 2 is located on the image side end surface of the light guide 1, and the light emitting surface of the small light source 2 faces the object side of the light guide 1; or, the small light source 2 is located outside the light guide 1, The light-emitting surface of the small light source 2 faces the light guide 1 inward; or, the small light source 2 is included in the image side end of the light guide 1, and the light-emitting surface of the small light source 2 faces the object side of the light guide 1. .

所述小型光源2为发光器件。优选的，所述小型光源2选用发光二极管(light emitting diode，LED)或激光二极管(LASER diode，LD)。优选的，所述小型光源2位于所述光导1的像侧或外侧。所述小型光源2的数量大于等于1。优选的，所述小型光源2的数量为2～4个。优选的，当存在多个小型光源2时，小型光源2环绕所述摄像头模组4。优选的，当存在多个小型光源2，小型光源2等间隔分布环绕所述摄像头模组4。The small light source 2 is a light emitting device. Preferably, the small light source 2 is a light emitting diode (LED) or a laser diode (LD). Preferably, the small light source 2 is located on the image side or outside of the light guide 1. The number of the small light sources 2 is greater than or equal to one. Preferably, the number of the small light sources 2 is 2 to 4. Preferably, when there are multiple small light sources 2, the small light sources 2 surround the camera module 4. Preferably, when there are multiple small light sources 2, the small light sources 2 are distributed around the camera module 4 at equal intervals.

所述照明电路板3为印制电路板(Printed Circuit Board，PCB)，与所述小型光源2具备电路连接。其作用是为小型光源2提供机械支撑并供电。所述照明电路板3可集成于本发明所应用的设备的主板上，作为主板的一部分，并受主板上的控制器所控制。所述照明电路板3也可以为独立的电路板，与本发明所应用的设备的主板通过连接器构成电路连接。必要时，所述照明电路板3上还可以具备电阻、电容、电感等电子元器件以及芯片。所述照明电路板3也可集成于本发明所应用的摄像头模组的电路板上，与摄像头模组构成一个整体。The lighting circuit board 3 is a printed circuit board (Printed Circuit Board, PCB), and has a circuit connection with the small light source 2. Its function is to provide mechanical support and power supply for the small light source 2. The lighting circuit board 3 can be integrated on the main board of the device applied in the present invention, as a part of the main board, and controlled by the controller on the main board. The lighting circuit board 3 may also be an independent circuit board, which is connected to the main board of the device applied in the present invention through a connector. When necessary, the lighting circuit board 3 may also be equipped with electronic components and chips such as resistors, capacitors, and inductors. The lighting circuit board 3 can also be integrated on the circuit board of the camera module used in the present invention, and form a whole with the camera module.

以下提出本发明的近摄照明器的具体实施例。其他未描述的、但可自由组合实施的方案不再穷举。Specific embodiments of the close-up illuminator of the present invention are presented below. Other solutions that are not described but can be freely combined are not exhaustively listed.

<第一实施例><First embodiment>

本发明第一实施例结构如图1所示。本实施例包含光导1、小型光源2和照明电路板3。所述小型光源2包含2个发光二极管，分比为第一发光二极管21和第二发光二极管22。所述光导1为中空圆柱体，环绕摄像头模组4。所述光导1的物方端面超出所述摄像头模组4的物方端面1mm。所述第一发光二极管21和第二发光二极管22紧贴所述光导1的像方端面。所述第一发光二极管21和第二发光二极管22分别位于摄像头模组4的两侧。所述第一发光二极管21和第二发光二极管22的发光面朝向物方。所述第一发光二极管21和第二发光二极管22均安装于照明电路板3上。所述照明电路板3位于所述第一发光二极管21和第二发光二极管22的像方。所述照明电路板3上包含驱动第一发光二极管21和第二发光二极管22所需的电阻、电容等***电子元器件。所述照明电路板3与本发明所应用的设备的主板具有电路连接，从而使得设备能够控制所述第一发光二极管21和第二发光二极管22。The structure of the first embodiment of the present invention is shown in FIG. 1. This embodiment includes a light guide 1, a small light source 2 and a lighting circuit board 3. The small light source 2 includes two light emitting diodes, and the ratio is a first light emitting diode 21 and a second light emitting diode 22. The light guide 1 is a hollow cylinder and surrounds the camera module 4. The object end surface of the light guide 1 exceeds the object end surface of the camera module 4 by 1 mm. The first light-emitting diode 21 and the second light-emitting diode 22 are close to the image-side end surface of the light guide 1. The first light emitting diode 21 and the second light emitting diode 22 are respectively located on two sides of the camera module 4. The light emitting surfaces of the first light emitting diode 21 and the second light emitting diode 22 face the object. The first light emitting diode 21 and the second light emitting diode 22 are both mounted on the lighting circuit board 3. The lighting circuit board 3 is located on the image side of the first light emitting diode 21 and the second light emitting diode 22. The lighting circuit board 3 includes peripheral electronic components such as resistors and capacitors required to drive the first light emitting diode 21 and the second light emitting diode 22. The lighting circuit board 3 has a circuit connection with the main board of the device to which the present invention is applied, so that the device can control the first light emitting diode 21 and the second light emitting diode 22.

<第二实施例><Second Embodiment>

本发明第一实施例结构如图2所示。本实施例包含光导1、小型光源2和照明电路板3。所述小型光源2包含4个发光二极管，分比为第一发光二极管21、第二发光二极管22、第三发光二极管23和第四发光二极管24(受三维位置关系限制，其中第三发光二极管23和第四发光二极管24在图2中未画出)。所述光导1为中空圆柱体，其物方端面的内壁包含一个倒角。所述光导1环绕摄像头模组4。所述光导1的物方端面超出所述摄像头模组4的物方端面1mm。所述第一发光二极管21、第二发光二极管22、第三发光二极管23和第四发光二极管24紧贴所述光导1的像方端面。所述第一发光二极管21、第二发光二极管22、第三发光二极管23和第四发光二极管24等间距环绕摄像头模组4。所述第一发光二极管21、第二发光二极管22、第三发光二极管23和第四发光二极管24的发光面朝向物方。所述第一发光二极管21、第二发光二极管22、第三发光二极管23和第四发光二极管24均安装于照明电路板3上。所述照明电路板3位于所述第一发光二极管21、第二发光二极管22、第三发光二极管23和第四发光二极管24的像方。所述照明电路板3上包含驱动第一发光二极管21、第二发光二极管22、第三发光二极管23和第四发光二极管24所需的电阻、电容等***电子元器件。所述照明电路板3与本发明所应用的设备的主板具有电路连接，从而使得设备能够控制所述第一发光二极管21、第二发光二极管22、第三发光二极管23和第四发光二极管24。The structure of the first embodiment of the present invention is shown in FIG. 2. This embodiment includes a light guide 1, a small light source 2 and a lighting circuit board 3. The small light source 2 includes 4 light-emitting diodes, the ratio of which is the first light-emitting diode 21, the second light-emitting diode 22, the third light-emitting diode 23, and the fourth light-emitting diode 24 (limited by the three-dimensional positional relationship, the third light-emitting diode 23 And the fourth light emitting diode 24 are not shown in FIG. 2). The light guide 1 is a hollow cylinder, and the inner wall of the object side includes a chamfer. The light guide 1 surrounds the camera module 4. The object end surface of the light guide 1 exceeds the object end surface of the camera module 4 by 1 mm. The first light-emitting diode 21, the second light-emitting diode 22, the third light-emitting diode 23 and the fourth light-emitting diode 24 are closely attached to the image-side end surface of the light guide 1. The first light emitting diode 21, the second light emitting diode 22, the third light emitting diode 23 and the fourth light emitting diode 24 surround the camera module 4 at equal intervals. The light emitting surfaces of the first light emitting diode 21, the second light emitting diode 22, the third light emitting diode 23 and the fourth light emitting diode 24 face the object. The first light emitting diode 21, the second light emitting diode 22, the third light emitting diode 23 and the fourth light emitting diode 24 are all mounted on the lighting circuit board 3. The lighting circuit board 3 is located on the image side of the first light emitting diode 21, the second light emitting diode 22, the third light emitting diode 23 and the fourth light emitting diode 24. The lighting circuit board 3 includes peripheral electronic components such as resistors and capacitors required to drive the first light-emitting diode 21, the second light-emitting diode 22, the third light-emitting diode 23, and the fourth light-emitting diode 24. The lighting circuit board 3 has a circuit connection with the main board of the device to which the present invention is applied, so that the device can control the first light emitting diode 21, the second light emitting diode 22, the third light emitting diode 23 and the fourth light emitting diode 24.

本实施例的三维结构示意图如图3所示。The three-dimensional structure diagram of this embodiment is shown in FIG. 3.

<第三实施例><Third Embodiment>

本发明第三实施例结构如图4所示。本实施例包含光导1、小型光源2和照明电路板3。所述小型光源2包含4个发光二极管，分比为第一发光二极管21、第二发光二极管22。所述光导1为中空圆柱体，其物方端面的内壁包含一个倒角。所述光导1环绕摄像头模组4。所述光导1的物方内径小于像方内径，即所述光导1半包裹住摄像头模组4的物方端面。所述光导1的物方端面超出所述摄像头模组4的物方端面1mm。所述第一发光二极管21、第二发光二极管22紧贴所述光导1的像方端面。所述第一发光二极管21、第二发光二极管22位于摄像头模组4两侧。所述第一发光二极管21、第二发光二极管22的发光面朝向物方。所述第一发光二极管21、第二发光二极管22均安装于照明电路板3上。所述照明电路板3位于所述第一发光二极管21和第二发光二极管22的像方。所述照明电路板3上包含驱动第一发光二极管21、第二发光二极管22所需的电阻、电容等***电子元器件。所述照明电路板3与本发明所应用的设备的主板具有电路连接，从而使得设备能够控制所述第一发光二极管21、第二发光二极管22。The structure of the third embodiment of the present invention is shown in FIG. 4. This embodiment includes a light guide 1, a small light source 2 and a lighting circuit board 3. The small light source 2 includes 4 light-emitting diodes, and the ratio is a first light-emitting diode 21 and a second light-emitting diode 22. The light guide 1 is a hollow cylinder, and the inner wall of the object side includes a chamfer. The light guide 1 surrounds the camera module 4. The object side inner diameter of the light guide 1 is smaller than the image side inner diameter, that is, the light guide 1 half-wraps the object side end surface of the camera module 4. The object end surface of the light guide 1 exceeds the object end surface of the camera module 4 by 1 mm. The first light-emitting diode 21 and the second light-emitting diode 22 are close to the image-side end surface of the light guide 1. The first light emitting diode 21 and the second light emitting diode 22 are located on both sides of the camera module 4. The light emitting surfaces of the first light emitting diode 21 and the second light emitting diode 22 face the object. The first light emitting diode 21 and the second light emitting diode 22 are both mounted on the lighting circuit board 3. The lighting circuit board 3 is located on the image side of the first light emitting diode 21 and the second light emitting diode 22. The lighting circuit board 3 includes peripheral electronic components such as resistors and capacitors required to drive the first light emitting diode 21 and the second light emitting diode 22. The lighting circuit board 3 has a circuit connection with the main board of the device to which the present invention is applied, so that the device can control the first light emitting diode 21 and the second light emitting diode 22.

<第四实施例><Fourth Embodiment>

本发明第四实施例结构如图5所示。本实施例包含光导1、小型光源2和照明电路板3。所述小型光源2包含4个发光二极管，分比为第一发光二极管21、第二发光二极管22。所述光导1为中空锥体，其外壁和内壁均为锥面。其物方端面与镜头模组4的物方端面呈一个钝角。所述光导1环绕摄像头模组4。所述第一发光二极管21、第二发光二极管22紧贴所述光导1的像方端面。所述第一发光二极管21、第二发光二极管22位于摄像头模组4两侧。所述第一发光二极管21、第二发光二极管22的发光面朝向物方。所述第一发光二极管21、第二发光二极管22均安装于照明电路板3上。所述照明电路板3位于所述第一发光二极管21和第二发光二极管22的像方。所述照明电路板3集成于本实施例所应用的设备的主板上。The structure of the fourth embodiment of the present invention is shown in FIG. 5. This embodiment includes a light guide 1, a small light source 2 and a lighting circuit board 3. The small light source 2 includes 4 light-emitting diodes, and the ratio is a first light-emitting diode 21 and a second light-emitting diode 22. The light guide 1 is a hollow cone, and its outer wall and inner wall are both tapered. The object end face and the object end face of the lens module 4 form an obtuse angle. The light guide 1 surrounds the camera module 4. The first light-emitting diode 21 and the second light-emitting diode 22 are close to the image-side end surface of the light guide 1. The first light emitting diode 21 and the second light emitting diode 22 are located on both sides of the camera module 4. The light emitting surfaces of the first light emitting diode 21 and the second light emitting diode 22 face the object. The first light emitting diode 21 and the second light emitting diode 22 are both mounted on the lighting circuit board 3. The lighting circuit board 3 is located on the image side of the first light emitting diode 21 and the second light emitting diode 22. The lighting circuit board 3 is integrated on the main board of the device applied in this embodiment.

<第五实施例><Fifth Embodiment>

本发明第五实施例结构如图6所示。本实施例包含光导1、小型光源2和照明电路板3。所述小型光源2包含4个发光二极管，分比为第一发光二极管21、第二发光二极管22。所述光导1为中空立方体，其物方端面的内壁包含一个倒角。所述光导1环绕摄像头模组4。所述光导1的物方端面超出所述摄像头模组4的物方端面1mm。所述第一发光二极管21、第二发光二极管22紧贴所述光导1的侧面。所述第一发光二极管21、第二发光二极管22的发光面朝向光导1。所述第一发光二极管21、第二发光二极管22均安装于照明电路板3上。所述照明电路板3位于所述第一发光二极管21和第二发光二极管22的像方。所述照明电路板3上包含驱动第一发光二极管21、第二发光二极管22所需的电阻、电容等***电子元器件。所述照明电路板3与本发明所应用的设备的主板具有电路连接，从而使得设备能够控制所述第一发光二极管21、第二发光二极管22。The structure of the fifth embodiment of the present invention is shown in FIG. 6. This embodiment includes a light guide 1, a small light source 2 and a lighting circuit board 3. The small light source 2 includes 4 light-emitting diodes, and the ratio is a first light-emitting diode 21 and a second light-emitting diode 22. The light guide 1 is a hollow cube, and the inner wall of the object side includes a chamfer. The light guide 1 surrounds the camera module 4. The object end surface of the light guide 1 exceeds the object end surface of the camera module 4 by 1 mm. The first light emitting diode 21 and the second light emitting diode 22 are close to the side surface of the light guide 1. The light emitting surfaces of the first light emitting diode 21 and the second light emitting diode 22 face the light guide 1. The first light emitting diode 21 and the second light emitting diode 22 are both mounted on the lighting circuit board 3. The lighting circuit board 3 is located on the image side of the first light emitting diode 21 and the second light emitting diode 22. The lighting circuit board 3 includes peripheral electronic components such as resistors and capacitors required to drive the first light emitting diode 21 and the second light emitting diode 22. The lighting circuit board 3 has a circuit connection with the main board of the device to which the present invention is applied, so that the device can control the first light emitting diode 21 and the second light emitting diode 22.

综上所述，本发明的近摄照明器具有如下优势：In summary, the close-up illuminator of the present invention has the following advantages:

以下提出采用了前述近摄照明器的近摄成像设备的具体方案。The specific solution of the close-up imaging device using the aforementioned close-up illuminator is proposed below.

如图11-14所示，本发明提供一种近摄成像设备，As shown in Figures 11-14, the present invention provides a close-up imaging device,

包含摄像头模组4和前述的近摄照明器；Contains the camera module 4 and the aforementioned close-up illuminator;

所述摄像头模组4包括镜头模块10、外壳20、底板30和感光芯片600。The camera module 4 includes a lens module 10, a housing 20, a bottom plate 30 and a photosensitive chip 600.

所述镜头模块10中包含透镜组及其所需的支撑机械结构。The lens module 10 includes a lens group and the necessary supporting mechanical structure.

所述外壳20用于固定所述镜头模块10和所述底板30；优选的，外壳20选用金属或塑料材质。The housing 20 is used to fix the lens module 10 and the bottom plate 30; preferably, the housing 20 is made of metal or plastic.

所述底板30与所述外壳20相固定，且所述底板30上安装有感光芯片600。所述底板30用于提供机械支撑和电路连接。所述底板30上印制有电路，必要时包含配合感光芯片600工作的电子元件。The bottom plate 30 is fixed to the housing 20, and a photosensitive chip 600 is mounted on the bottom plate 30. The bottom plate 30 is used to provide mechanical support and circuit connection. Circuits are printed on the bottom plate 30 and contain electronic components that work with the photosensitive chip 600 when necessary.

所述感光芯片600为面阵型光电探测器，优选的，感光芯片600为CMOS图像传感器或CCD图像传感器。The photosensitive chip 600 is an area array photodetector. Preferably, the photosensitive chip 600 is a CMOS image sensor or a CCD image sensor.

所述镜头模块10的透镜组为适用于近距离成像(包括但不限于微距成像和显微成像)的镜头。具体而言，所述镜头模块10进行成像时，光轴上物点到镜头模块10的物方主面的距离小于40mm时的聚焦像点的均方差半径小于光轴上物点位于无穷远处时的聚焦像点的均方差半径。The lens group of the lens module 10 is a lens suitable for short-range imaging (including but not limited to macro imaging and microscopic imaging). Specifically, when the lens module 10 performs imaging, when the distance between the object point on the optical axis and the main surface of the lens module 10 is less than 40 mm, the mean square error radius of the focused image point is smaller than that when the object point on the optical axis is located at infinity The mean square error radius of the focused image point at.

所述镜头模块10沿着光轴的物侧至像侧依次包括：第一透镜组100、光圈300、第二透镜组200。The lens module 10 includes a first lens group 100, an aperture 300, and a second lens group 200 in order from the object side to the image side along the optical axis.

所述第一透镜组100和第二透镜组200均为正光焦度；所述第一透镜组100的物方通光口径大于其像方通光口径，所述第二透镜组200的物方通光口径小于其像方通光口径；所述第一透镜组100和第二透镜组200均为由两片及两片以上透镜组成的透镜组，且均包含非球面透镜。所述第一透镜组100和第二透镜组200中透镜的材料为透明塑料或玻璃。The first lens group 100 and the second lens group 200 both have positive refractive power; the object-side light aperture of the first lens group 100 is larger than its image-side light aperture, and the object-side light aperture of the second lens group 200 is smaller than its image. Square-pass light aperture; the first lens group 100 and the second lens group 200 are both lens groups composed of two or more lenses, and both include aspheric lenses. The materials of the lenses in the first lens group 100 and the second lens group 200 are transparent plastic or glass.

所述镜头模块10和所述感光芯片600的感光面的位置关系满足如下条件：The positional relationship between the lens module 10 and the photosensitive surface of the photosensitive chip 600 satisfies the following conditions:

其中f ₂₀₀为第二透镜组200的焦距，即第二透镜组的像方主面2001到第二透镜组的像方焦面2002的距离，S _ima为感光芯片600的感光面到第二透镜组的像方主面2001的距离，如图12所示。 Where f ₂₀₀ is the focal length of the second lens group 200, that is, the distance from the image-side principal surface 2001 of the second lens group to the image-side focal surface 2002 of the second lens group, and S _ima is the photosensitive surface of the photosensitive chip 600 to the second lens The distance of the main image side 2001 of the group is shown in FIG. 12.

所述第一透镜组100的像方介质和第二透镜组200物方介质可为空气、塑料或玻璃以及其他透明材质。The image-side medium of the first lens group 100 and the object-side medium of the second lens group 200 may be air, plastic, glass, or other transparent materials.

当所述第一透镜组100的像方介质和所述第二透镜组200的物方介质为空气时，所述光圈300位于所述第一透镜组100或所述第二透镜组200的表面，或其物方、像方的空气介质中。When the image side medium of the first lens group 100 and the object side medium of the second lens group 200 are air, the aperture 300 is located on the surface of the first lens group 100 or the second lens group 200 , Or in the air medium of the object or image side.

当所述第一透镜组100的像方介质和所述第二透镜组200的物方介质为包括塑料或玻璃在内的透明材质；此时，所述第一透镜组100和所述第二透镜组200有共同的一片透镜，该透镜的物方的所有透镜和该透镜的物方表面构成第一透镜组100，该透镜的像方表面和其像方的所有透镜构成第二透镜组200；所述光圈300位于该透镜的表面或该透镜的透明介质内。这种第一透镜组100和第二透镜组200共用一片透镜的情形，可减少一片透镜数量，使得镜头模块10的结构更紧凑，从而利于小型化。When the image-side medium of the first lens group 100 and the object-side medium of the second lens group 200 are transparent materials including plastic or glass; at this time, the first lens group 100 and the second lens group 200 The lens group 200 has a common lens. All the lenses on the object side of the lens and the object surface of the lens constitute the first lens group 100. The image side surface of the lens and all the lenses on the image side constitute the second lens group 200. The aperture 300 is located on the surface of the lens or in the transparent medium of the lens. In this case where the first lens group 100 and the second lens group 200 share one lens, the number of one lens can be reduced, so that the structure of the lens module 10 is more compact, thereby facilitating miniaturization.

作为第一类结构，如图11所示，必要时，感光芯片前方还有滤光片400。优选的，滤光片400为红外滤光片。具体地讲，所述近摄成像设备还包括滤光片400；所述滤光片400安装在所述感光芯片600的物方侧，固定于所述外壳20上。As the first type of structure, as shown in FIG. 11, if necessary, there is a filter 400 in front of the photosensitive chip. Preferably, the filter 400 is an infrared filter. Specifically, the close-up imaging device further includes a filter 400; the filter 400 is installed on the object side of the photosensitive chip 600 and fixed on the housing 20.

当镜头模块10和感光芯片600之间还包含滤光片400时，滤光片400作为平板型光学元件，会影响镜头模块10的像方光学参数，第二透镜组的像方主面2001到第二透镜组的像方焦面2002位置为考虑所述滤光片400的折射效应之后的位置。When the optical filter 400 is further included between the lens module 10 and the photosensitive chip 600, the optical filter 400 as a flat optical element will affect the image-side optical parameters of the lens module 10, and the image-side main surface 2001 of the second lens group The position of the image-side focal plane 2002 of the second lens group is the position after considering the refraction effect of the filter 400.

对于有调焦需要的场合，所述近摄成像设备还包括调焦马达；所述调焦马达为音圈马达或超声波马达。所述调焦马达用于使镜头模块10相对于外壳20运动。For occasions where focusing is required, the close-up imaging device further includes a focusing motor; the focusing motor is a voice coil motor or an ultrasonic motor. The focusing motor is used to move the lens module 10 relative to the housing 20.

如图13所示，所述近摄成像设备还包括磁铁1001、前弹簧垫1002、后弹簧垫1003、线圈1004；所述磁铁1001和线圈1004构成所述调焦马达；所述磁铁1001固定于所述外壳20的内壁，所述前弹簧垫1002和后弹簧垫1003用于限制所述镜头模块10的移动位置，所述线圈1004与所示镜头模块10的外壁固定。此时所述镜头模块10具备调焦功能。As shown in FIG. 13, the close-up imaging device further includes a magnet 1001, a front spring pad 1002, a rear spring pad 1003, and a coil 1004; the magnet 1001 and the coil 1004 constitute the focusing motor; the magnet 1001 is fixed to The inner wall of the housing 20, the front spring pad 1002 and the rear spring pad 1003 are used to limit the moving position of the lens module 10, and the coil 1004 is fixed to the outer wall of the lens module 10 shown. At this time, the lens module 10 has a focusing function.

当所述镜头模块10具备调焦功能时，经调焦马达调焦后，所述镜头模块10和感光芯片600的位置关系也满足公式1。When the lens module 10 has a focusing function, after focusing by the focusing motor, the positional relationship between the lens module 10 and the photosensitive chip 600 also satisfies Formula 1.

作为第二类结构，如图14所示，所述近摄成像设备不具备调焦功能，所述镜头模块10与所述感光芯片600之间的距离为定值；不同规格的所述近摄成像设备产生系列不同的定值，但均满足公式1。As a second type of structure, as shown in FIG. 14, the close-up imaging device does not have a focusing function, and the distance between the lens module 10 and the photosensitive chip 600 is a fixed value; the close-ups of different specifications The imaging device produces a series of different fixed values, but all satisfy formula 1.

优选地，当所述近摄成像设备不具备调焦功能时，所述镜头模块10和所述感光芯片600的感光面的位置关系满足如下条件：Preferably, when the close-up imaging device does not have a focusing function, the positional relationship between the lens module 10 and the photosensitive surface of the photosensitive chip 600 meets the following conditions:

S _ima＝f ₂₀₀ (公式2)。 S _ima =f ₂₀₀ (Equation 2).

下面进一步详细介绍本发明的近摄成像设备。The close-up imaging device of the present invention will be described in further detail below.

如图15所示，本发明提供一种近距离成像用微型成像镜头，其中：沿着一光轴的物侧至像侧依序包括：第一透镜组100、光圈300、第二透镜组200。As shown in FIG. 15, the present invention provides a micro imaging lens for close-range imaging, wherein: the object side to the image side along an optical axis sequentially includes: a first lens group 100, an aperture 300, and a second lens group 200 .

所述第一透镜组100和第二透镜组200均为正光焦度；所述第一透镜组100的物方通光口径大于其像方通光口径，所述第二透镜组200的物方通光口径小于其像方通光口径；所述第一透镜组100的焦距f ₁₀₀≤40mm，所述第二透镜组200的焦距f ₂₀₀≤20mm； The first lens group 100 and the second lens group 200 both have positive refractive power; the object-side light aperture of the first lens group 100 is larger than its image-side light aperture, and the object-side light aperture of the second lens group 200 is smaller than its image. Square pass light aperture; the focal length f _{100 of} the first lens group 100 ≤ 40 mm, and the focal length f _{200 of} the second lens group ₂₀₀ ≤ ₂₀ mm;

在使用时，待摄物体500与所述第一透镜组100的物方主面的距离od ₁₀₀小于第一透镜组100的焦距的2倍，即 When in use, the distance od ₁₀₀ between the object 500 and the main surface of the first lens group 100 is less than twice the focal length of the first lens group 100, that is

且所述第二透镜组(200)的像方主面到像面的距离id ₂₀₀小于所述第二透镜组200的焦距的两倍，即 And the distance id ₂₀₀ from the principal image side of the second lens group (200) to the image plane is less than twice the focal length of the second lens group 200, that is

在上述两式确定的条件下，针对近距离成像，尤其是超近距离成像时，所述第二透镜组200的像方表面到所述探测器600的距离能够显著减小，即有利于减小总光学筒长，便于设备的小型化。Under the conditions determined by the above two formulas, for short-distance imaging, especially for ultra-short-distance imaging, the distance from the image side surface of the second lens group 200 to the detector 600 can be significantly reduced, which is beneficial to reduce The small total optical tube length is convenient for miniaturization of the equipment.

且所述第一透镜组100的像方数值孔径(numerical aperture)NA _img100、所述第二透镜组200的物方数值孔径NA _obj200满足如下条件： The first lens group and the image side numerical aperture 100 _(numerical aperture) NA img100, the object side numerical aperture NA of the second lens group 200 satisfies the following condition _obj200:

待摄物体500经第一透镜组100和第二透镜组200成像后，最终成像到探测器600的光敏面上。进一步，当存在波长选择要求时，第二透镜组200和探测器600的光敏面之间还包括滤光片400。由于在第一透镜组100和第二透镜组200之间的空间中的光束的数值孔径较小，便于减小制造和装配误差对光束的质量影响，因此该设计有利于提高生产时的良品率。所述第二透镜组200至少存在一个透镜，其像方表面为非球面，该曲面靠近光轴处为凹面，且该曲面远离光轴一段距离后其坡度(指该曲面与子午面相交形成的曲线的切线与光轴的夹角的反正切值的绝对值)减小，该设计有利于在大视场角的情况下抑制离轴视场的像差，尤其是抑制像散和场曲，以提升本发明在物方视场较大的情况下的成像质量。After the object 500 to be photographed is imaged by the first lens group 100 and the second lens group 200, it is finally imaged on the photosensitive surface of the detector 600. Further, when there is a wavelength selection requirement, a filter 400 is further included between the second lens group 200 and the photosensitive surface of the detector 600. Since the numerical aperture of the light beam in the space between the first lens group 100 and the second lens group 200 is small, it is convenient to reduce the influence of manufacturing and assembly errors on the quality of the light beam, so this design is beneficial to improve the yield during production . The second lens group 200 has at least one lens, the image side surface is aspherical, the curved surface is a concave surface close to the optical axis, and the slope of the curved surface after a distance away from the optical axis (referring to the intersection of the curved surface and the meridian surface) The absolute value of the arctangent value of the angle between the tangent of the curve and the optical axis) is reduced. This design is beneficial to suppress the aberration of the off-axis field of view in the case of a large field of view, especially to suppress astigmatism and field curvature, In order to improve the imaging quality of the present invention when the field of view is large on the object side.

所述光圈300为能够限定通光孔径的物理实体。定义第一透镜组100外侧为整个镜头的物方，第二透镜组的外侧为整个镜头的像方。所述光圈300位于第一透镜组100和第二透镜组200之间，有利于对成像中的畸变(distortion)和色差(chromatic aberration)进行校正。The aperture 300 is a physical entity capable of defining a clear aperture. The outside of the first lens group 100 is defined as the object side of the entire lens, and the outside of the second lens group is defined as the image side of the entire lens. The aperture 300 is located between the first lens group 100 and the second lens group 200, which is beneficial for correcting distortion and chromatic aberration in imaging.

所述光圈300到所述第一透镜组100的边缘沿光轴方向的距离sd ₁₀₀满足关系式： The distance sd ₁₀₀ from the aperture 300 to the edge of the first lens group 100 along the optical axis direction satisfies the relationship:

所述光圈300到所述第二透镜组200的边缘沿光轴方向的距离sd ₂₀₀满足关系式： The distance sd ₂₀₀ from the aperture 300 to the edge of the second lens group 200 along the optical axis direction satisfies the relationship:

当光圈300与第一透镜组100和第二透镜组200的距离满足关系式4和关系式5所表达的关系时，有利于减小大视场成像情况下光线在第一透镜组100的像方表面和第二透镜组200的物方表面上的光线高度(即光线与表面的交点到光轴的距离)，从而便于减小第一透镜组100和第二透镜组200的直径，有便于小型化且减少加工成本(大直径透镜加工成本高)；进一步，也便于所述第一透镜组100的像方的第一个透镜和第二透镜组200的物方的第一个透镜进行低阶球差的校正，从而提高成像质量。综上，本发明的有益效果为：提出了一种由第一透镜组100、光圈300和第二透镜组200组成的三明治结构的镜头，能有效降低近距离成像时的像差，尤其是畸变和色差。满足前面所述的结构特征和参数关系式的镜头，能有效减少镜头的直径，减小镜头尺寸和降低加工难度和加工成本，并能有效减少有镜头和探测器组成的结构的总光学筒长。When the distance between the aperture 300 and the first lens group 100 and the second lens group 200 satisfies the relationship expressed by the relational expression 4 and the relational expression 5, it is beneficial to reduce the image of the light in the first lens group 100 under the large field of view imaging. The height of the light on the square surface and the object surface of the second lens group 200 (that is, the distance between the intersection of the light and the surface and the optical axis), so as to facilitate the reduction of the diameters of the first lens group 100 and the second lens group 200, which is convenient Miniaturization and reduction of processing costs (large diameter lens processing costs are high); further, it is also convenient for the first lens of the image side of the first lens group 100 and the first lens of the object side of the second lens group 200 to be reduced Correction of order spherical aberration to improve imaging quality. In summary, the beneficial effects of the present invention are: a sandwich structure lens composed of a first lens group 100, an aperture 300 and a second lens group 200 is proposed, which can effectively reduce aberrations, especially distortion, when imaging at close range. And color difference. A lens that satisfies the aforementioned structural features and parameter relations can effectively reduce the diameter of the lens, reduce the size of the lens, and reduce the processing difficulty and cost, and can effectively reduce the total optical barrel length of the structure composed of the lens and the detector .

本发明中，所述第二透镜组200沿着光轴的物侧至像侧依序包括至少三个透镜；所述第一透镜组100沿着光轴的物侧至像侧依序包括至少三个透镜。第一透镜组100和第二透镜组200各自的数量可以自由组合，不同的结构设置也可以自由自合；第一透镜组100和/或第二透镜组200具有整体轴向调节装置；进一步地，第一透镜组100和/或第二透镜组200中至少有一个透镜具有其单独轴向调节装置。In the present invention, the second lens group 200 includes at least three lenses in sequence from the object side to the image side along the optical axis; the first lens group 100 includes at least three lenses in sequence from the object side to the image side along the optical axis. Three lenses. The respective numbers of the first lens group 100 and the second lens group 200 can be freely combined, and different structural settings can also be freely combined; the first lens group 100 and/or the second lens group 200 have an overall axial adjustment device; further At least one lens in the first lens group 100 and/or the second lens group 200 has its own axial adjustment device.

所述第二透镜组200沿着光轴的物侧至像侧依序设置的最后两片透镜有如下四种设置方式：The last two lenses of the second lens group 200 arranged in sequence from the object side to the image side of the optical axis can be arranged in the following four ways:

第一种第二透镜组：倒数第二片透镜的像方表面为凸面，且其物方表面和像方表面中至少一表面为非球面；最后一片透镜的物方表面和像方表面均为凹面，且其物方表面和像方表面中至少一表面为非球面。The first second lens group: the image side surface of the penultimate lens is convex, and at least one of the object side surface and the image side surface is aspherical; the object side surface and the image side surface of the last lens are both A concave surface, and at least one of the object side surface and the image side surface is aspherical.

第二种第二透镜组：倒数第二片透镜的像方表面为凸面，且其物方表面和像方表面中至少一表面为非球面；最后一片透镜的物方表面为凸面，像方表面为凹面，其物方表面和像方表面中至少一表面为非球面，且具有一个中心厚度最小、越离轴厚度越大的区域。The second second lens group: the image side surface of the penultimate lens is convex, and at least one of the object side surface and the image side surface is aspherical; the object side surface of the last lens is convex, the image side surface It is a concave surface, and at least one of the object side surface and the image side surface is aspherical, and has an area with the smallest center thickness and the greater the thickness from the axis.

第三种第二透镜组：倒数第二片透镜的物方表面为凹面，像方表面为凸面，且其物方表面和像方表面中至少一表面为非球面；最后一片透镜的物方表面为凹面，像方表面为凸面，且其物方表面和像方表面中至少一表面为非球面。The third type of second lens group: the object surface of the penultimate lens is concave, the image surface is convex, and at least one of the object surface and the image surface is aspherical; the object surface of the last lens It is a concave surface, the image side surface is convex, and at least one of the object side surface and the image side surface is aspherical.

第四种第二透镜组：倒数第二片透镜的像方表面为凸面，且其物方表面和像方表面中至少一表面为非球面；最后一片透镜的物方表面为凸面，像方表面为凹面，其物方表面和像方表面中至少一表面为非球面，且具有一个中心厚度最大、越离轴厚度越小的区域。The fourth second lens group: the image side surface of the penultimate lens is convex, and at least one of the object side surface and the image side surface is aspherical; the object side surface of the last lens is convex, the image side surface It is a concave surface, and at least one of the object side surface and the image side surface is aspherical, and has an area with the largest center thickness and the smaller the thickness away from the axis.

各种第二透镜组中：所述最后一片透镜的物方表面和像方表面中至少一表面具有一反曲点。In various second lens groups: at least one of the object side surface and the image side surface of the last lens has an inflection point.

所述第一透镜组100沿着光轴的物侧至像侧依序设置的前两片透镜有如下三种设置方式：The first two lenses of the first lens group 100 arranged in sequence from the object side to the image side of the optical axis can be arranged in the following three ways:

第一种第一透镜组：第一片透镜的物方表面和像方表面均为凹面，且其物方表面和像方表面中至少一表面为非球面；第二片透镜的像方表面为凸面，且其物方表面和像方表面中至少一表面为非球面。The first type of the first lens group: the object surface and image surface of the first lens are both concave, and at least one of the object surface and the image surface is aspherical; the image surface of the second lens is Convex surface, and at least one of the object side surface and the image side surface is aspherical.

第二种第一透镜组：第一片透镜的物方表面为凹面，像方表面为凸面，其物方表面和像方表面中至少一表面为非球面，且具有一个中心厚度最大、越离轴厚度越小的区域；第二片透镜的物方表面为凸面，像方表面为凹面，且其物方表面和像方表面中至少一表面为非球面。The second type of the first lens group: the object surface of the first lens is concave, the image surface is convex, and at least one of the object surface and the image surface is aspherical, and has a center with the largest thickness and more distance The area where the axis thickness is smaller; the object side surface of the second lens is convex, the image side surface is concave, and at least one of the object side surface and the image side surface is aspherical.

第三种第一透镜组：第一片透镜的物方表面和像方表面均为凹面，且其物方表面和像方表面中至少一表面为非球面；第二片透镜的物方表面为凸面，且其物方表面和像方表面中至少一表面为非球面。The third type of the first lens group: the object surface and the image surface of the first lens are both concave, and at least one of the object surface and the image surface is aspherical; the object surface of the second lens is Convex surface, and at least one of the object side surface and the image side surface is aspherical.

各种第一透镜组中所述第一片透镜的物方表面和像方表面中至少一表面具有一反曲点。At least one of the object side surface and the image side surface of the first lens in the various first lens groups has an inflection point.

所有镜头都有其适用的物距范围。本发明较好工作的一种情形是，物面500位于第一透镜组100的物方焦面，探测器600的光敏面位于第二透镜组200的像方焦面。当第二透镜组200之后还包含滤光片400时，第二透镜组200的像方焦面是考虑滤光片400的折射效应后的实际焦面。在此情况下，物面500上的一个物点发出的光经第一透镜组100后的出射光近似为准直光，该准直光经第二透镜组200聚焦后在探测器600的光敏面上形成一物点。当物面500不处于上述理想位置时，需要进一步进行对焦，既可通过调整本发明所述第一透镜组100和第二透镜组200的整体相对于探测器600的距离来进行对焦，也可通过调整本发明所述第一透镜组100或第二透镜组200的其中之一来进行对焦。All lenses have their applicable object distance range. A situation in which the present invention works well is that the object plane 500 is located on the focal plane of the first lens group 100 and the photosensitive surface of the detector 600 is located on the image focal plane of the second lens group 200. When the second lens group 200 further includes the filter 400, the image-side focal plane of the second lens group 200 is the actual focal plane after considering the refraction effect of the filter 400. In this case, the light emitted from an object point on the object plane 500 after passing through the first lens group 100 is approximately collimated light, and the collimated light is focused by the second lens group 200 on the photosensitive of the detector 600. An object point is formed on the surface. When the object plane 500 is not in the above ideal position, further focusing is required, either by adjusting the distance between the first lens group 100 and the second lens group 200 of the present invention relative to the detector 600, or Focusing is performed by adjusting one of the first lens group 100 or the second lens group 200 of the present invention.

本发明所述镜头中的透镜，可为玻璃、塑料或其他透光材料。当使用塑料材料时，可以有效减少重量和成本。透镜的透光表面可为非球面，从而获得更多的像差校正的自由度，从而更好的校正像差。且本发明所述第二透镜组200至少存在一个透镜其像方表面为非球面，其过镜头光轴的剖面构成的曲线包含反曲点，即改变了曲面的凹凸性，该设计有利于在大视场角的情况下抑制离轴视场的像差，以提升本发明在物方视场较大的情况下的成像质量。The lens in the lens of the present invention may be glass, plastic or other light-transmitting materials. When plastic materials are used, weight and cost can be effectively reduced. The light-transmitting surface of the lens can be aspherical, so as to obtain more freedom of aberration correction, thereby better correcting aberrations. In addition, the second lens group 200 of the present invention has at least one lens whose image side surface is an aspherical surface, and the curve formed by the cross-section through the optical axis of the lens contains inflection points, that is, the unevenness of the curved surface is changed. In the case of a large field of view, the aberration of the off-axis field of view is suppressed, so as to improve the imaging quality of the present invention when the object side field of view is large.

本发明所述光圈300置于镜头中部，所谓镜头中部是指光圈的物方和像方均含透镜。这种光圈设置方法称为光圈中置。光圈中置有助于提升视场角，且对畸变和色差有较好抑制作用。优选地，所述近距离成像用微型成像镜头是用于便携式电子产品的微型成像镜头。The aperture 300 of the present invention is placed in the middle of the lens. The so-called middle of the lens means that both the object side and the image side of the aperture contain lenses. This aperture setting method is called center aperture. The central position of the iris helps to increase the angle of view, and has a better suppression of distortion and chromatic aberration. Preferably, the micro imaging lens for close-range imaging is a micro imaging lens for portable electronic products.

进一步，本发明所述镜头包含机械外壳作为封装，并与马达、面阵光电探测器(例如CMOS图像传感器等)等组成成像模组，可用于手机、平板电脑、可穿戴设备(例如智能手环、智能手表等)、小型相机(例如运动相机等)等电子产品，实现近距离成像功能，甚至可实现显微成像功能。Further, the lens of the present invention includes a mechanical casing as a package, and forms an imaging module with a motor, an area array photodetector (such as CMOS image sensor, etc.), which can be used in mobile phones, tablet computers, and wearable devices (such as smart bracelets). , Smart watches, etc.), small cameras (such as sports cameras, etc.) to achieve close-range imaging functions, and even microscopic imaging functions.

以下提出本发明的具体实施例。Specific embodiments of the present invention are presented below.

<第一实施例><First embodiment>

本发明第一实施例如图16所示。所述第一透镜组100包含4片透镜，所述第二透镜组200包含5片透镜。上述9片透镜均为非球面透镜。非球面透镜的面型由曲线方程表示如下(非球面由该曲线绕光轴回转而成)：The first embodiment of the present invention is shown in FIG. 16. The first lens group 100 includes 4 lenses, and the second lens group 200 includes 5 lenses. The above 9 lenses are all aspherical lenses. The surface shape of the aspheric lens is expressed by the curve equation as follows (the aspheric surface is formed by the curve revolving around the optical axis):

其中：among them:

X：非球面上距离光轴为Y的点，其与相切于非球面光轴上焦点的切面的相对距离；X: The point on the aspheric surface that is Y from the optical axis, and the relative distance between it and the tangent to the focal point on the aspheric surface;

Y：非球面曲线上的点与光轴的垂直距离；Y: the vertical distance between the point on the aspheric curve and the optical axis;

r：曲率半径；r: radius of curvature;

k：圆锥系数；k: conic coefficient;

A _i：第i阶非球面系数。 A _i : aspheric coefficient of order i.

本实施例中的透镜各面参数如图22和图23所示。The parameters of each surface of the lens in this embodiment are shown in FIGS. 22 and 23.

图22中曲率半径r、厚度t等长度型物理量的单位均为毫米；表面1到表面18依次为本发明由物方到像方的各个表面，面19到面20为滤光片。图23中A2到A14为前述2到14阶非球面系数。The units of length-type physical quantities such as radius of curvature r and thickness t in FIG. 22 are millimeters; surface 1 to surface 18 are the surfaces of the present invention from the object side to the image side in turn, and surfaces 19 to 20 are filters. A2 to A14 in FIG. 23 are the aforementioned 2 to 14 order aspheric coefficients.

本实施例的第一透镜组100的第一片透镜其物方表面为非球面，该曲面靠近光轴处为凹面，且该曲面远离光轴一段距离后存在反曲点，像方表面为非球面，为凹面；第二片透镜的物方表面为非球面，且靠近光轴处为凸面，像方表面为凹面，第二片透镜整体上呈现为中心比四周厚；第三片透镜的物方表面也为凹面，但凹陷程度弱于第一片透镜的物方表面，像方表面为凹面，物方表面和像方表面均为非球面；第四片透镜的物方表面和像方表面均为非球面的凸面。The object surface of the first lens of the first lens group 100 of this embodiment is an aspheric surface, and the curved surface is a concave surface close to the optical axis, and there is a point of inflection after the curved surface is far away from the optical axis, and the image side surface is non-spherical. The spherical surface is concave; the object surface of the second lens is aspherical, and the surface near the optical axis is convex, and the image surface is concave. The second lens appears to be thicker in the center than the periphery; the object of the third lens The square surface is also concave, but the degree of depression is weaker than that of the object surface of the first lens. The image surface is concave. Both the object surface and the image surface are aspherical; the object surface and image surface of the fourth lens All are aspherical convex surfaces.

本实施例的第二透镜组200的第一片透镜的物方表面和像方表面均为非球面的凸面；第二片透镜的物方表面和像方表面均为非球面的凹面；第三片透镜的物方表面的中心为凸面，然后离轴位置出现一个凹面，像方表面中心为凹面，然后离轴位置出现一个凸面；第四片透镜的物方表面为较为平坦的非球面，像方表面为非球面的凸面；最后一片透镜的物方表面为非球面的凹面，其像方表面为非球面，该曲面靠近光轴处为凹面，且该曲面远离光轴一段距离后存在反曲点。The object side and image side surfaces of the first lens of the second lens group 200 of this embodiment are both aspherical convex surfaces; the object side and image side surfaces of the second lens are both aspherical concave surfaces; third The center of the object surface of the lens is convex, then a concave surface appears off-axis, the center of the image surface is concave, and then a convex surface appears off-axis; the object surface of the fourth lens is a relatively flat aspheric surface, like The square surface is aspherical convex surface; the object surface of the last lens is aspherical concave surface, the image side surface is aspherical, the curved surface is concave near the optical axis, and the curved surface is recurved after a certain distance away from the optical axis point.

本实施例所展示的镜头，在±30°视场角情况下，可获得0.15以上的物方数值孔径，且在全视场范围内大部分区域斯特列尔比可高于0.9，有较好成像质量。The lens shown in this embodiment can obtain an object numerical aperture of more than 0.15 under the condition of a field of view of ±30°, and the Strehl ratio can be higher than 0.9 in most areas of the full field of view. Good image quality.

<第二实施例><Second Embodiment>

本发明第二实施例如图17所示。所述第一透镜组100包含4片透镜，所述第二透镜组200包含4片透镜。本实施例中的透镜各面参数如图24和图25所示，变量定义与前述类似，不再赘述。The second embodiment of the present invention is shown in FIG. 17. The first lens group 100 includes 4 lenses, and the second lens group 200 includes 4 lenses. The parameters of each surface of the lens in this embodiment are shown in FIG. 24 and FIG. 25, and the definition of the variables is similar to the foregoing, and will not be repeated.

本实施例的第二透镜组200的第一片透镜的物方表面和像方表面均为非球面的凸面；第二片透镜的物方表面和像方表面均为非球面的凹面，其中物方表面凹陷程度大于像方表面，且像方表面在离轴位置有反曲点；第三片透镜的物方表面的中心为凹面，像方表面为非球面的凸面；最后一片透镜的物方表面为非球面的凸面，其像方表面为非球面的凹面，且中心厚度小于离轴位置的厚度。The object side and image side surfaces of the first lens of the second lens group 200 of this embodiment are both aspherical convex surfaces; the object side and image side surfaces of the second lens are both aspherical concave surfaces, where the object The concave degree of the square surface is greater than that of the image side, and the image side surface has an inflection point at the off-axis position; the center of the object side surface of the third lens is concave, and the image side surface is an aspheric convex surface; the object side of the last lens The surface is aspherical convex surface, the image side surface is aspherical concave surface, and the center thickness is smaller than the thickness at the off-axis position.

本实施例相比第一实施例，其放大率更小，适用于需要更小放大率的场合。Compared with the first embodiment, this embodiment has a smaller magnification ratio and is suitable for occasions where a smaller magnification ratio is required.

<第三实施例><Third Embodiment>

本发明的第三实施例如图18所示，第一透镜组100包含3片透镜，第二透镜组200包含4片透镜。本实施例中的透镜各面参数如图26和图27所示，变量定义与前述类似，不再赘述。In the third embodiment of the present invention, as shown in FIG. 18, the first lens group 100 includes 3 lenses, and the second lens group 200 includes 4 lenses. The parameters of each surface of the lens in this embodiment are shown in FIG. 26 and FIG. 27, and the definition of the variables is similar to the foregoing, and will not be repeated.

本实施例的第一透镜组100的第一片透镜其物方表面为非球面，该曲面靠近光轴处为凹面，且该曲面远离光轴一段距离后存在反曲点，像方表面为非球面的凸面；第二片透镜的物方表面为非球面的凸面，像方表面为非球面的凹面；第三片透镜的物方表面和像方表面均为非球面的凸面。The object surface of the first lens of the first lens group 100 of this embodiment is an aspheric surface, and the curved surface is a concave surface close to the optical axis, and there is a point of inflection after the curved surface is far away from the optical axis, and the image side surface is non-spherical. The convex surface of the spherical surface; the object surface of the second lens is an aspheric convex surface, and the image surface is an aspheric concave surface; the object surface and image surface of the third lens are both aspheric convex surfaces.

本实施例透镜片数较少，可减少成本，但广角性能弱于之前实施例。The number of lenses in this embodiment is small, which can reduce the cost, but the wide-angle performance is weaker than the previous embodiment.

<第四实施例><Fourth Embodiment>

本发明的第四实施例如图19所示，第一透镜组100包含5片透镜，第二透镜组200包含6片透镜。本实施例中的透镜各面参数如图28和图29所示，变量定义与前述类似，不再赘述。In the fourth embodiment of the present invention, as shown in FIG. 19, the first lens group 100 includes 5 lenses, and the second lens group 200 includes 6 lenses. The parameters of each surface of the lens in this embodiment are shown in FIG. 28 and FIG. 29, and the definition of the variables is similar to the foregoing, and will not be repeated.

本实施例的第一透镜组100的第一片透镜其物方表面为非球面，该曲面靠近光轴处为凹面，且该曲面远离光轴一段距离后存在反曲点，像方表面为非球面的凹面；第二片透镜的物方表面为非球面，且靠近光轴处为凸面，像方表面为较为平坦的非球面凹面，第二片透镜整体上呈现为中心比四周厚；第三片透镜的物方表面也为非球面的凹面，但凹陷程度弱于第一片透镜的物方表面，像方表面为非球面的凸面；第四片透镜的物方表面和像方表面均为非球面的凹面；最后一片透镜的物方表面和像方表面均为非球面的凸面。The object surface of the first lens of the first lens group 100 of this embodiment is an aspheric surface, and the curved surface is a concave surface close to the optical axis, and there is a point of inflection after the curved surface is far away from the optical axis, and the image side surface is non-spherical. The concave surface of the spherical surface; the object surface of the second lens is aspherical, and the surface near the optical axis is convex, the image-side surface is a relatively flat aspheric concave surface, and the second lens as a whole appears to be thicker in the center than the periphery; third The object surface of the lens is also aspherical and concave, but the degree of recession is weaker than that of the first lens. The image surface is aspherical and convex; the fourth lens has both the object surface and the image surface Concave aspherical surface; the object and image surfaces of the last lens are both aspherical and convex.

本实施例的第二透镜组200的第一片透镜的物方表面和像方表面均为非球面的凸面；第二片透镜的物方表面为非球面的凸面，像方表面为非球面的凹面；第三片透镜的物方表面的中心为凸面，然后离轴位置出现一个凹面，像方表面中心为凹面，然后离轴位置出现一个凸面；第四片透镜的物方表面为较为平坦的非球面，像方表面为非球面的凸面；第五片透镜的物方表面为非球面的凹面，其像方表面为非球面的凸面；最后一片透镜，物方表面靠近光轴处为凹面，像方表面为较为平坦的非球面，中心呈现为轻微的凸面。The object surface and the image surface of the first lens of the second lens group 200 of this embodiment are both aspherical convex surfaces; the object surface of the second lens is aspherical convex surface, and the image-side surface is aspherical Concave surface; the center of the object surface of the third lens is convex, then a concave surface appears off-axis, the center of the image surface is concave, and then a convex surface appears off-axis; the object surface of the fourth lens is relatively flat Aspheric, the image side surface is aspherical convex surface; the fifth lens has an aspherical concave object surface, and its image side surface is aspherical convex surface; the last lens, the object side surface is concave near the optical axis, The surface of the image side is relatively flat aspherical, and the center is slightly convex.

本实施例采用更多片数透镜以矫正像差，可获得良好的广角性能，尤其是±30°视场角内畸变小于0.7％(如图20所示)，这对于广角成像来说非常优异。This embodiment uses a larger number of lenses to correct aberrations, and can obtain good wide-angle performance, especially the distortion within a ±30° field of view is less than 0.7% (as shown in Figure 20), which is very good for wide-angle imaging .

<第五实施例><Fifth Embodiment>

本发明的第五实施例如图21所示，第一透镜组100包含3片透镜，第二透镜组200包含3片透镜。本实施例中的透镜各面参数如图30和图31所示，变量定义与前述类似，不再赘述。As shown in FIG. 21 in the fifth embodiment of the present invention, the first lens group 100 includes three lenses, and the second lens group 200 includes three lenses. The parameters of each surface of the lens in this embodiment are shown in FIG. 30 and FIG. 31, and the definition of the variables is similar to the foregoing, and will not be repeated.

本实施例的第二透镜组200的第一片透镜的物方表面和像方表面均为非球面的凸面，第二片透镜的物方表面为非球面的凹面，像方表面为非球面的凸面；第三片透镜的物方表面中心为非球面的凸面，像方表面中心为非球面的凹面，且该曲面远离光轴一段距离后存在反曲点。The object side and image side surfaces of the first lens of the second lens group 200 of this embodiment are both aspherical convex surfaces, the object side surface of the second lens is aspherical concave surface, and the image side surface is aspherical Convex; the center of the object surface of the third lens is an aspheric convex surface, and the center of the image surface is an aspheric concave surface, and there is a point of inflection after the curved surface is far away from the optical axis.

本实施例镜片数量较少，便于降低成本，但平场性能有所下降。The number of lenses in this embodiment is small, which facilitates cost reduction, but the flat field performance is somewhat reduced.

综上所述，本发明的近摄成像设备具有如下优势：In summary, the close-up imaging device of the present invention has the following advantages:

1、现有技术中，感光芯片的感光面位于镜头的焦面上；存在调焦功能时，感光芯片的感光面在调焦范围内位于镜头的一倍焦距到两倍焦距所确定的两个平面之间。本发明的近摄成像设备与现有技术不同，镜头与感光芯片的位置关系满足关系式，该构造有利于减少在近距离成像时镜头的像方端面到感光芯片的距离，避免采用增距方式实现近距离拍照，利于结构的小型化。1. In the prior art, the photosensitive surface of the photosensitive chip is located on the focal plane of the lens; when there is a focus adjustment function, the photosensitive surface of the photosensitive chip is located within the focus range of the lens from one focal length to twice the focal length of the lens. Between planes. The close-up imaging device of the present invention is different from the prior art in that the positional relationship between the lens and the photosensitive chip satisfies the relational expression. This structure is beneficial to reduce the distance from the image side end surface of the lens to the photosensitive chip when imaging at close range, and avoids the use of an increase in distance. The realization of close-range photography is conducive to the miniaturization of the structure.

2、如前所述，本发明的近摄成像设备的构造可避免通过增距方式实现近距离拍照，从而使模组的结构更加紧凑，减少像方空气介质的总厚度从而避免浪费空间。在此基础上，节省下来的空间可用于在镜头中增加镜片数量，从而使得镜头获得更加丰富的像差校正自由度，以实现更高的光学分辨率和更低的畸变。2. As mentioned above, the structure of the close-up imaging device of the present invention can avoid the realization of close-up photography by means of increasing the distance, thereby making the structure of the module more compact, reducing the total thickness of the image side air medium and avoiding wasting space. On this basis, the saved space can be used to increase the number of lenses in the lens, so that the lens can obtain a richer degree of freedom in aberration correction to achieve higher optical resolution and lower distortion.

3、本发明的近摄成像设备中，镜头包含第一透镜组和第二透镜组，构造成复合显微镜的结构，此时第一透镜组等效为物镜，该结构有利于在近距离成像下获取优秀的成像质量。3. In the close-up imaging device of the present invention, the lens includes a first lens group and a second lens group, and is structured into a compound microscope structure. At this time, the first lens group is equivalent to an objective lens. This structure is beneficial for imaging at close range Obtain excellent image quality.

4、本发明的近摄成像设备中，镜头中光圈位于中间位置，光圈中置的构造有利于减少成像时的横向色差，也有利于实现大视场角成像。4. In the close-up imaging device of the present invention, the aperture in the lens is located in the middle position, and the structure of the aperture in the middle is beneficial to reduce lateral chromatic aberration during imaging, and is also beneficial to realize imaging with a large field of view.

5、本发明的近摄成像设备中，在成像过程中，镜头的第一透镜组处于物距小像距大的状态，第二透镜组处于物距大像距小的状态，此时第一透镜组和第二透镜组相互之间存在安装误差时，安装误差尤其是距离误差远小于第一透镜组的像距和第二透镜组的物距，从而使得安装误差对成像质量的影响较小，有利于减少成像质量对安装误差的敏感度，从而获取较高的良品率。5. In the close-up imaging device of the present invention, during the imaging process, the first lens group of the lens is in the state of small object distance and large image distance, and the second lens group is in the state of large object distance and small image distance. When there is an installation error between the lens group and the second lens group, the installation error, especially the distance error, is much smaller than the image distance of the first lens group and the object distance of the second lens group, so that the installation error has less influence on the image quality , Which is beneficial to reduce the sensitivity of imaging quality to installation errors, thereby obtaining a higher yield.

6、传统微型镜头多为照相镜头，针对物距远大于像距的情况所设计，不适用于近距离的微距和显微成像；本发明的近摄成像设备，提出了一种由第一透镜组、光圈和第二透镜组组成的三明治结构的镜头构型，能在小型化的情况下获取较高的近距离成像效果，能有效降低近距离成像时的像差，尤其是畸变和色差。满足本发明的的结构特征和参数关系式的镜头，能有效减少镜头的直径，减小镜头尺寸和降低加工难度和加工成本，并能有效减少有镜头和探测器组成的结构的总光学筒长。6. Traditional miniature lenses are mostly photographic lenses, designed for the situation where the object distance is far greater than the image distance, and are not suitable for close-range macro and microscopic imaging; the close-up imaging device of the present invention proposes a first The lens configuration of the sandwich structure composed of the lens group, the aperture and the second lens group can obtain high close-range imaging effect under the condition of miniaturization, and can effectively reduce the aberrations during close-range imaging, especially distortion and chromatic aberration . The lens that satisfies the structural features and parameter relational expressions of the present invention can effectively reduce the diameter of the lens, reduce the size of the lens, reduce the processing difficulty and processing cost, and can effectively reduce the total optical barrel length of the structure composed of the lens and the detector .

本领域的技术人员容易理解，以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。Those skilled in the art can easily understand that the above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present invention, All should be included in the protection scope of the present invention.

Claims

一种近摄照明器，其特征在于：包括光导(1)、小型光源(2)和照明电路板(3)；A close-up illuminator, characterized in that it comprises a light guide (1), a small light source (2) and a lighting circuit board (3);

所述光导(1)为透明或半透明材料，所述光导(1)环绕设置在摄像头模组(4)的***，所述光导(1)的后端与所述摄像头模组(4)存在部分长度投影叠合，且所述光导(1)的物方端面向前超过所述摄像头模组(4)的物方端面，所述光导(1)的物方端面包含出光区域(11)；The light guide (1) is a transparent or semi-transparent material, the light guide (1) is arranged around the periphery of the camera module (4), and the rear end of the light guide (1) exists with the camera module (4) Partial length projections are superimposed, and the object end face of the light guide (1) forwards beyond the object end face of the camera module (4), and the object end face of the light guide (1) includes a light exit area (11);

所述小型光源(2)设置在所述光导(1)背向其物方端面的后方；The small light source (2) is arranged behind the end surface of the light guide (1) facing away from the object side;

所述照明电路板(3)为印制电路板，与所述小型光源(2)具备电路连接。The lighting circuit board (3) is a printed circuit board, and is provided with a circuit connection with the small light source (2).
如权利要求1所述的近摄照明器，其特征在于：The close-up illuminator of claim 1, wherein:

所述光导(1)的物方端面向前超过所述摄像头模组(4)的物方端面的距离S ₁₁满足0.1mm≤S ₁₁≤3mm。 The light guide (1) forward beyond the end face on the object side of the camera module (4) from the object-side end surface S ₁₁ satisfy 0.1mm≤S ₁₁ ≤3mm.
如权利要求2所述的近摄照明器，其特征在于：The close-up illuminator of claim 2, wherein:

所述光导(1)的物方端面的法向平行于所述摄像头模组(4)的光轴。The normal direction of the object end surface of the light guide (1) is parallel to the optical axis of the camera module (4).
如权利要求2所述的近摄照明器，其特征在于：The close-up illuminator of claim 2, wherein:

所述光导(1)的物方端面包含一个向所述摄像头模组(4)倾斜的倒角；The object end surface of the light guide (1) includes a chamfer inclined to the camera module (4);

倒角的内侧端至少平齐所述摄像头模组(4)的物方端面，倒角的外侧端向前超过所述摄像头模组(4)的物方端面的距离即为所述S ₁₁。 The inner end of the chamfer is at least flush with the object end surface of the camera module (4), and the distance that the outer end of the chamfer forward exceeds the object end surface of the camera module (4) is the S ₁₁ .
如权利要求4所述的近摄照明器，其特征在于：The close-up illuminator according to claim 4, wherein:

所述光导(1)的物方内径小于其像方内径，即所述光导(1)半包裹住所述摄像头模组(4)的物方端面。The object side inner diameter of the light guide (1) is smaller than the image side inner diameter, that is, the light guide (1) half-wraps the object side end surface of the camera module (4).
如权利要求2所述的近摄照明器，其特征在于：The close-up illuminator of claim 2, wherein:

所述光导(1)的物方端面包含一个向所述摄像头模组(4)倾斜的圆角；The object end surface of the light guide (1) includes a rounded corner inclined to the camera module (4);

圆角的内侧端至少平齐所述摄像头模组(4)的物方端面，圆角的外侧端向前超过所述摄像头模组(4)的物方端面的距离即为所述S ₁₁； The inner end of the rounded corner is at least flush with the object end surface of the camera module (4), and the distance that the outer end of the rounded corner forwards beyond the object end surface of the camera module (4) is the S ₁₁ ;

或者，所述光导(1)的物方端面包含一个倾向所述摄像头模组(4)的阶梯；Alternatively, the object end surface of the light guide (1) includes a step inclined to the camera module (4);

阶梯的内侧端至少平齐所述摄像头模组(4)的物方端面，阶梯的外侧端向前超过所述摄像头模组(4)的物方端面的距离即为所述S ₁₁； The inner end of the step is at least flush with the object end surface of the camera module (4), and the distance that the outer end of the step forwards beyond the object end surface of the camera module (4) is the S ₁₁ ;

或者，所述光导(1)的物方端面包含一个弧形凸起；Alternatively, the object end surface of the light guide (1) includes an arc-shaped protrusion;

弧形凸起内后端至少平齐所述摄像头模组(4)的物方端面，弧形凸起的最前端向前超过所述摄像头模组(4)的物方端面的距离即为所述S ₁₁。 The inner and rear ends of the arc-shaped protrusions are at least flush with the object end surface of the camera module (4), and the distance that the foremost end of the arc-shaped protrusion forwards beyond the object end surface of the camera module (4) is determined Said S ₁₁ .
如权利要求2所述的近摄照明器，其特征在于：The close-up illuminator of claim 2, wherein:

所述光导(1)为中空圆柱体、中空矩形体、中空锥体或为环绕所述摄像头模组(4)分布的多个分离的形体；The light guide (1) is a hollow cylinder, a hollow rectangular body, a hollow cone, or a plurality of separate shapes distributed around the camera module (4);

当所述光导(1)为中空锥体时，其物方锥径小于像方锥径；所述光导(1)的物方端面与所述摄像头模组(4)的物方端面呈一个钝角。When the light guide (1) is a hollow cone, its object side cone diameter is smaller than the image side cone diameter; the object side end surface of the light guide (1) and the object side end surface of the camera module (4) form an obtuse angle .
如权利要求2所述的近摄照明器，其特征在于：The close-up illuminator of claim 2, wherein:

所述小型光源(2)位于所述光导(1)的像方端面，所述小型光源(2)的发光面朝向所述光导(1)的物方；The small light source (2) is located on the image side end surface of the light guide (1), and the light emitting surface of the small light source (2) faces the object side of the light guide (1);

或者，所述小型光源(2)位于所述光导(1)的外侧，所述小型光源(2)的发光面向内侧朝向所述光导(1)；Alternatively, the small light source (2) is located outside the light guide (1), and the light emitting surface of the small light source (2) faces the light guide (1) inward;

或者，所述小型光源(2)包含在所述光导(1)的像方端内部，所述小型光源(2)的发光面朝向所述光导(1)的物方。Alternatively, the small light source (2) is contained inside the image side end of the light guide (1), and the light emitting surface of the small light source (2) faces the object side of the light guide (1).
如权利要求2所述的近摄照明器，其特征在于：The close-up illuminator of claim 2, wherein:

所述照明电路板(3)集成于所述近摄照明器所应用的设备的主板上，作为设备主板的一部分，并受设备主板上的控制器所控制；The lighting circuit board (3) is integrated on the main board of the device to which the close-up illuminator is applied, as a part of the device main board, and is controlled by a controller on the device main board;

或者，所述照明电路板(3)集成于所述摄像头模组(4)的电路板上，与摄像头模组(4)构成一个整体；Alternatively, the lighting circuit board (3) is integrated on the circuit board of the camera module (4) to form a whole with the camera module (4);

或者，所述照明电路板(3)为独立的电路板，与所述近摄照明器所应用的设备的主板通过连接器构成电路连接。Alternatively, the lighting circuit board (3) is an independent circuit board, and is connected to the main board of the equipment to which the close-up illuminator is applied through a connector to form a circuit connection.
一种近摄成像设备，其特征在于：A close-up imaging device, which is characterized in:

包含摄像头模组(4)和如权利要求1-9任一项所述的近摄照明器；Comprising a camera module (4) and the close-up illuminator according to any one of claims 1-9;

所述摄像头模组(4)包括镜头模块(10)、外壳(20)、底板(30)和感光芯片(600)；The camera module (4) includes a lens module (10), a housing (20), a bottom plate (30) and a photosensitive chip (600);

所述外壳(20)用于固定所述镜头模块(10)和所述底板(30)；The housing (20) is used to fix the lens module (10) and the bottom plate (30);

所述底板(30)上安装有所述感光芯片(600)；The photosensitive chip (600) is mounted on the bottom plate (30);

光轴上物点到镜头模块(10)的物方主面的距离小于40mm时的聚焦像点的均方差半径小于光轴上物点位于无穷远处时的聚焦像点的均方差半径；When the distance between the object point on the optical axis and the main surface of the lens module (10) is less than 40mm, the mean square error radius of the focused image point is smaller than the mean square error radius of the focused image point when the object point on the optical axis is located at infinity;

所述镜头模块(10)沿着光轴的物侧至像侧依次包括：第一透镜组(100)、光圈(300)、第二透镜组(200)；The lens module (10) includes a first lens group (100), an aperture (300), and a second lens group (200) in order from the object side to the image side along the optical axis;

所述第一透镜组(100)和第二透镜组(200)均为正光焦度；所述第一透镜组(100)的物方通光口径大于其像方通光口径，所述第二透镜组(200)的物方通光口径小于其像方通光口径；The first lens group (100) and the second lens group (200) have positive refractive power; the object-side light aperture of the first lens group (100) is larger than the image-side light aperture, and the second lens group (200) ) Has a smaller aperture on the object side than the aperture on its image side;

所述镜头模块(10)和所述感光芯片(600)的感光面的位置关系满足如下条件：The positional relationship between the lens module (10) and the photosensitive surface of the photosensitive chip (600) satisfies the following conditions:

0.5f ₂₀₀<S _ima<1.5f ₂₀₀ (公式1) 0.5f ₂₀₀ <S _ima <1.5f ₂₀₀ (Formula 1)

其中f ₂₀₀为第二透镜组(200)的焦距，即第二透镜组的像方主面(2001)到第二透镜组的像方焦面(2002)的距离，S _ima为感光芯片(600)的感光面到第二透镜组的像方主面(2001)的距离。 Where f ₂₀₀ is the focal length of the second lens group (200), that is, the distance from the main image side (2001) of the second lens group to the image side focal surface (2002) of the second lens group, and S _ima is the photosensitive chip (600 ) The distance from the photosensitive surface of the second lens group to the image-side principal surface (2001).
如权利要求10所述的近摄成像设备，其特征在于：The close-up imaging device according to claim 10, wherein:

所述摄像头模组还包括滤光片(400)；The camera module further includes a filter (400);

所述滤光片(400)安装在所述感光芯片(600)的物方侧，固定于所述外壳(20)上；The filter (400) is installed on the object side of the photosensitive chip (600) and fixed on the housing (20);

第二透镜组的像方主面(2001)到第二透镜组的像方焦面(2002)位置为考虑所述滤光片(400)的折射效应之后的位置。The position of the image side principal plane (2001) of the second lens group to the image side focal plane (2002) of the second lens group is the position after considering the refraction effect of the filter (400).
如权利要求10所述的近摄成像设备，其特征在于：The close-up imaging device according to claim 10, wherein:

所述摄像头模组还包括调焦马达；The camera module further includes a focusing motor;

所述调焦马达用于使镜头模块(10)相对于外壳(20)运动，在所述镜头模块(10)的调焦范围内，公式1均成立。The focusing motor is used to move the lens module (10) relative to the housing (20), and within the focusing range of the lens module (10), formula 1 is all established.
如权利要求12所述的近摄成像设备，其特征在于：The close-up imaging device according to claim 12, wherein:

所述调焦马达为音圈马达或超声波马达。The focusing motor is a voice coil motor or an ultrasonic motor.
如权利要求12所述的近摄成像设备，其特征在于：The close-up imaging device according to claim 12, wherein:

所述摄像头模组还包括磁铁(1001)、前弹簧垫(1002)、后弹簧垫(1003)、线圈(1004)；The camera module further includes a magnet (1001), a front spring pad (1002), a rear spring pad (1003), and a coil (1004);

所述磁铁(1001)和线圈(1004)构成所述调焦马达；The magnet (1001) and the coil (1004) constitute the focusing motor;

所述磁铁(1001)固定于所述外壳(20)的内壁，所述前弹簧垫(1002)和后弹簧垫(1003)用于限制所述镜头模块(10)的移动位置，所述线圈(1004)与所示镜头模块(10)的外壁固定。The magnet (1001) is fixed to the inner wall of the housing (20), the front spring pad (1002) and the rear spring pad (1003) are used to limit the moving position of the lens module (10), and the coil ( 1004) is fixed to the outer wall of the lens module (10) shown.
如权利要求10所述的近摄成像设备，其特征在于：The close-up imaging device according to claim 10, wherein:

所述摄像头模组不具备调焦功能，所述镜头模块(10)与所述感光芯片(600)之间的距离为定值；The camera module does not have a focusing function, and the distance between the lens module (10) and the photosensitive chip (600) is a fixed value;

不同规格的所述摄像头模组产生系列不同的定值，但均满足公式1。The camera modules of different specifications produce a series of different fixed values, but all satisfy formula 1.
如权利要求15所述的近摄成像设备，其特征在于：The close-up imaging device according to claim 15, wherein:

当所述摄像头模组不具备调焦功能时，所述镜头模块(10)和所述感光芯片(600)的感光面的位置关系满足如下条件：When the camera module does not have a focusing function, the positional relationship between the lens module (10) and the photosensitive surface of the photosensitive chip (600) satisfies the following conditions:

S _ima＝f ₂₀₀ (公式2)。 S _ima =f ₂₀₀ (Equation 2).
如权利要求10所述的近摄成像设备，其特征在于：The close-up imaging device according to claim 10, wherein:

所述第一透镜组(100)的像方介质和所述第二透镜组(200)的物方介质为空气；The image side medium of the first lens group (100) and the object side medium of the second lens group (200) are air;

所述光圈(300)位于所述第一透镜组(100)或所述第二透镜组(200)的表面，或其物方、像方的空气介质中。The aperture (300) is located on the surface of the first lens group (100) or the second lens group (200), or in the air medium on the object side or the image side.
如权利要求10所述的近摄成像设备，其特征在于：The close-up imaging device according to claim 10, wherein:

所述第一透镜组(100)的像方介质和所述第二透镜组(200)的物方介质为包括塑料或玻璃在内的透明材质；The image-side medium of the first lens group (100) and the object-side medium of the second lens group (200) are transparent materials including plastic or glass;

此时，所述第一透镜组(100)和所述第二透镜组(200)有共同的一片透镜，该透镜的物方的所有透镜和该透镜的物方表面构成第一透镜组(100)，该透镜的像方表面和其像方的所有透镜构成第二透镜组(200)；At this time, the first lens group (100) and the second lens group (200) have a common lens, and all the lenses of the object side of the lens and the object surface of the lens constitute the first lens group (100). ), the image side surface of the lens and all the lenses on the image side constitute the second lens group (200);

所述光圈(300)位于该透镜的表面或该透镜的透明介质内。The aperture (300) is located on the surface of the lens or in the transparent medium of the lens.
如权利要求10所述的近摄成像设备，其特征在于：The close-up imaging device according to claim 10, wherein:

所述摄像头模组是用于便携式电子产品的摄像头模组。The camera module is a camera module for portable electronic products.
如权利要求10-19任一项所述的近摄成像设备，其特征在于：The close-up imaging device according to any one of claims 10-19, characterized in that:

所述第一透镜组(100)的焦距f ₁₀₀≤40mm，所述第二透镜组(200)的焦距f ₂₀₀≤20mm； The focal length f _{100 of} the first lens group (100) is less _{than or} equal to 40 mm, and the focal length f _{200 of} the second lens group (200) is less _{than or} equal to ₂₀ mm;

在使用时，待摄物体(500)与所述第一透镜组(100)的物方主面的距离od ₁₀₀小于第一透镜组100的焦距的2倍，即 When in use, the distance od ₁₀₀ between the object to be photographed (500) and the main surface of the first lens group (100) is less than twice the focal length of the first lens group 100, that is

od ₁₀₀<2f ₁₀₀； od ₁₀₀ <2f ₁₀₀ ;

且所述第二透镜组(200)的像方主面到像面的距离id ₂₀₀小于所述第二透镜组(200)的焦距的两倍，即 And the distance id ₂₀₀ from the main image side of the second lens group (200) to the image plane is less than twice the focal length of the second lens group (200), that is

id ₂₀₀<2f ₂₀₀； id ₂₀₀ <2f ₂₀₀ ;

且所述第一透镜组(100)的像方数值孔径NA _img100、所述第二透镜组(200)的物方数值孔径NA _obj200满足如下条件： And the image side numerical aperture _NA img100 said first lens group (100), said second lens group (200) of the object-side numerical aperture _NA obj200 satisfy the following conditions:

0<NA _img100，NA _obj200<0.05。 0<NA _img100 , NA _obj200 <0.05.
如权利要求20所述的近摄成像设备，其特征在于：The close-up imaging device according to claim 20, wherein:

所述光圈(300)到所述第一透镜组(100)的边缘沿光轴方向的距离sd ₁₀₀满足关系式： The distance sd ₁₀₀ from the aperture (300) to the edge of the first lens group (100) along the optical axis direction satisfies the relationship:

sd ₁₀₀<f ₁₀₀； sd ₁₀₀ <f ₁₀₀ ;

所述光圈(300)到所述第二透镜组(200)的边缘沿光轴方向的距离sd ₂₀₀满足关系式： The distance sd ₂₀₀ from the aperture (300) to the edge of the second lens group (200) along the optical axis direction satisfies the relationship:

sd ₂₀₀<f ₂₀₀。 sd ₂₀₀ <f ₂₀₀ .