CN216792574U

CN216792574U - Image pickup system

Info

Publication number: CN216792574U
Application number: CN202220282671.1U
Authority: CN
Inventors: 李洋; 王浩; 邢天祥; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2022-02-11
Filing date: 2022-02-11
Publication date: 2022-06-21
Anticipated expiration: 2032-02-11

Abstract

The utility model provides a camera system. The imaging system sequentially comprises from the object side to the image side along an optical axis: a first lens having an optical power; a diaphragm; a second lens having a negative focal power; a third lens having a positive focal power; a fourth lens having a positive refractive power; a fifth lens having optical power; the image side surface of the first lens is a convex surface; the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the object side surface of the fifth lens is a convex surface. The utility model solves the problem that the camera system in the prior art has long focus, high pixel and miniaturization which are difficult to be simultaneously considered.

Description

Image pickup system

Technical Field

The utility model relates to the technical field of optical imaging equipment, in particular to a camera system.

Background

Along with the rapid rise of the smart phone industrial chain, the smart phone is developed towards the direction of the full-screen integration and multi-camera mode, under the development that the smart phone tends to be small and light, the public pay more and more attention to how to ensure the photographing function of the smart phone under the condition that the internal space of the smart phone is dense, and particularly the smart phone with high-definition and small photographing effect is developed. The camera system on the mobile phone is rich in types, for example, the telephoto lens with the telephoto characteristic is difficult to realize simultaneously in miniaturization and high definition for the telephoto lens, the ordinary miniature telephoto lens applied to the smart phone is difficult to have higher definition, the telephoto lens with high definition needs a larger space, so that the miniaturization requirement is not met, and a proper method needs to be found to reduce the total length of the telephoto lens, so that the camera system meets the performance requirement and the miniaturization requirement at the same time.

That is, the imaging system in the related art has a problem that it is difficult to simultaneously achieve a long focus, a high pixel, and a small size.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide an imaging system to solve the problem that the imaging system in the prior art is difficult to simultaneously achieve long focus, high pixel and miniaturization.

In order to achieve the above object, according to one aspect of the present invention, there is provided an image pickup system including, in order from an object side to an image side along an optical axis: a first lens having an optical power; a diaphragm; a second lens having a negative focal power; a third lens having a positive focal power; a fourth lens having a positive refractive power; a fifth lens having optical power; the image side surface of the first lens is a convex surface; the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the object side surface of the fifth lens is a convex surface.

Further, the maximum field angle FOV of the camera system satisfies: FOV < 40 deg.

Further, the effective focal length f of the camera system and the entrance pupil diameter EPD of the camera system satisfy: f/EPD < 2.5.

Further, an on-axis distance TTL from the object side surface of the first lens to the imaging surface and an effective focal length f of the imaging system satisfy: TTL/f is less than or equal to 1.0.

Further, the effective focal length f1 of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: 11.0 < R2/f1 < -4.0.

Further, the effective focal length f of the camera system and the effective focal length f3 of the third lens satisfy: 2.5 < f3/f < 4.0.

Further, the effective focal length f2 of the second lens and the curvature radius R3 of the object side surface of the second lens satisfy: -2.5 < f2/R3 < -1.5.

Further, a radius of curvature R5 of the object side surface of the third lens and a radius of curvature R6 of the image side surface of the third lens satisfy: 3.5 < (R6+ R5)/(R6-R5) < 5.0.

Further, a curvature radius R6 of the image side surface of the third lens and a curvature radius R9 of the object side surface of the fifth lens satisfy: 2.0 < R6/R9 < 6.5.

Further, the effective focal length f of the image pickup system and the curvature radius R10 of the image side surface of the fifth lens satisfy: f/R10 is more than 1.5 and less than 6.5.

Further, an air interval T23 of the second lens and the third lens on the optical axis, an air interval T34 of the third lens and the fourth lens on the optical axis, and a center thickness CT3 of the third lens on the optical axis satisfy: 4.0 < (T23+ T34)/CT3 < 5.5.

Further, a center thickness CT5 of the fifth lens on the optical axis and an air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: 2.5 < CT5/T45 < 14.5.

Further, the combined focal length f12 of the first lens and the second lens and the effective focal length f of the camera system satisfy that: f12/f is more than 1.0 and less than 1.5.

Further, the central thickness CT2 of the second lens on the optical axis and the edge thickness ET2 of the second lens satisfy: 1.5 < ET2/CT2 < 2.0.

Further, an on-axis distance SAG21 between an intersection point of the object side surface of the second lens and the optical axis to an effective radius vertex of the object side surface of the second lens and an on-axis distance SAG22 between an intersection point of the image side surface of the second lens and the optical axis to an effective radius vertex of the image side surface of the second lens satisfy: 2.5 < (SAG22+ SAG21)/(SAG22-SAG21) < 4.0.

Further, an on-axis distance SAG41 between an intersection point of the object side surface of the fourth lens and the optical axis to an effective radius vertex of the object side surface of the fourth lens and an on-axis distance SAG51 between an intersection point of the object side surface of the fifth lens and the optical axis to an effective radius vertex of the object side surface of the fifth lens satisfy: 0.5 is less than or equal to SAG41/SAG51 is less than 5.0.

Further, an on-axis distance SAG52 between an intersection of the image-side surface of the fifth lens and the optical axis and an effective radius vertex of the image-side surface of the fifth lens and an edge thickness ET5 of the fifth lens satisfies: -1.5 < SAG52/ET5 < 0.5.

Further, the effective focal length f of the camera system satisfies: f is more than 10mm and less than 20 mm.

Further, the imaging system further includes a reflection prism disposed on an object side of the first lens.

According to another aspect of the present invention, there is provided an image pickup system including, in order from an object side to an image side along an optical axis: a first lens having an optical power; a diaphragm; a second lens having a negative focal power; a third lens having a positive focal power; a fourth lens having a positive refractive power; a fifth lens having a focal power; the image side surface of the first lens is a convex surface; the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the object side surface of the fifth lens is a convex surface; the effective focal length f of the camera system satisfies: f is more than 10mm and less than 20 mm; the on-axis distance TTL from the side surface of a shot object of the first lens to the imaging surface and the effective focal length f of the camera system meet the following requirements: TTL/f is less than or equal to 1.0.

Further, an on-axis distance SAG52 between an intersection point of the image-side surface of the fifth lens and the optical axis to an effective radius vertex of the image-side surface of the fifth lens and an edge thickness ET5 of the fifth lens satisfies: -1.5 < SAG52/ET5 < 0.5.

Further, the imaging system further includes a reflection prism disposed on the object side of the first lens.

By applying the technical scheme of the utility model, the camera system sequentially comprises a first lens, a diaphragm, a second lens, a third lens, a fourth lens and a fifth lens from a shot object side to an image side along an optical axis, wherein the first lens has focal power; the second lens has negative focal power; the third lens has positive focal power; the fourth lens has positive focal power; the fifth lens has focal power; the image side surface of the first lens is a convex surface; the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the object side surface of the fifth lens is a convex surface.

Through the focal power and the face type of each lens of reasonable setting, be favorable to controlling the trend of light, be favorable to the smooth transition of light, guarantee that imaging light can stably reach the imaging surface, increase imaging stability and imaging quality. Meanwhile, the characteristics of long focus and large aperture of the camera system can be ensured. In addition, the camera system adopts the periscopic lens to utilize the reflection principle of light to reflect the light directionally, and the prevention from the height is converted into a vertical or horizontal mode, so that the long-focus and miniaturized camera system is obtained.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:

fig. 1 is a schematic diagram showing a configuration of an image pickup system according to a first example of the present invention;

fig. 2 to 5 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging system in fig. 1;

fig. 6 is a schematic diagram showing a configuration of an image pickup system according to a second example of the present invention;

fig. 7 to 10 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging system in fig. 6;

fig. 11 is a schematic diagram showing a configuration of an image pickup system according to a third example of the present invention;

fig. 12 to 15 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging system in fig. 11;

fig. 16 is a schematic diagram showing a configuration of an image pickup system of example four of the present invention;

fig. 17 to 20 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging system in fig. 16;

fig. 21 is a schematic diagram showing a configuration of an image pickup system of example five of the present invention;

fig. 22 to 25 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging system in fig. 21;

fig. 26 is a schematic diagram showing a configuration of an image pickup system of example six of the present invention;

fig. 27 to 30 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging system in fig. 26;

fig. 31 is a schematic diagram showing a configuration of an image pickup system of example seven of the present invention;

fig. 32 to 35 show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging system in fig. 31;

fig. 36 shows a schematic configuration diagram of an image pickup system having a reflection prism according to an alternative embodiment of the present invention.

Wherein the figures include the following reference numerals:

e0, reflective prism; STO, stop; e1, first lens; s1, the subject side surface of the first lens; s2, an image side surface of the first lens; e2, second lens; s3, the object side surface of the second lens; s4, an image side surface of the second lens; e3, third lens; s5, the object side surface of the third lens; s6, an image side surface of the third lens; e4, fourth lens; s7, the object side surface of the fourth lens; s8, an image side surface of the fourth lens element; e5, fifth lens; s9, the object side surface of the fifth lens; s10, an image side surface of the fifth lens element; e6, optical filters; s11, the side of the object to be shot of the optical filter; s12, the image side surface of the optical filter; and S13, imaging surface.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It is to be noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the utility model.

It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present application.

In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens close to the object side becomes the object side surface of the lens, and the surface of each lens close to the image side is called the image side surface of the lens. The determination of the surface shape in the paraxial region can be performed by determining whether or not the surface shape is concave or convex, based on the R value (R denotes the radius of curvature of the paraxial region, and usually denotes the R value in a lens database (lens data) in optical software) in accordance with the determination method of a person ordinarily skilled in the art. Regarding the side of the object, when the R value is positive, the side is judged to be convex, and when the R value is negative, the side is judged to be concave; in the case of the image side surface, the image side surface is determined to be concave when the R value is positive, and is determined to be convex when the R value is negative.

The utility model provides an imaging system, aiming at solving the problem that the imaging system in the prior art is difficult to simultaneously give consideration to long focus, high pixel and miniaturization.

Example one

As shown in fig. 1 to 36, the imaging system includes, in order from an object side to an image side along an optical axis, a first lens having a power, a diaphragm, a second lens, a third lens, a fourth lens, and a fifth lens; the second lens has negative focal power; the third lens has positive focal power; the fourth lens has positive focal power; the fifth lens has focal power; the image side surface of the first lens is a convex surface; the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the object side surface of the fifth lens is a convex surface.

In the present embodiment, the maximum field angle FOV of the imaging system satisfies: FOV < 40 deg. The maximum field angle FOV of the camera system is controlled to be less than 40 degrees, the long-focus characteristic of the camera system can be maintained, and a distant object can be shot clearly. Preferably, the FOV is < 38 °.

In the present embodiment, the effective focal length f of the imaging system and the entrance pupil diameter EPD of the imaging system satisfy: f/EPD < 2.5. The ratio between the effective focal length f of the camera system and the entrance pupil diameter EPD of the camera system is controlled within a reasonable range, so that the aperture of the camera system is larger, the shooting effect of the camera system in a darkroom is ensured, and better imaging quality is guaranteed in the dark environment.

In the present embodiment, an on-axis distance TTL from the object side surface to the imaging surface of the first lens to the effective focal length f of the image capturing system satisfies: TTL/f is less than or equal to 1.0. The ratio of the distance TTL between the axis of the object side face to the imaging face of the first lens to the effective focal length f of the camera system is controlled within a reasonable range, so that the total length of the camera system is short, the camera system is favorable for meeting miniaturization, the whole camera system is good, and the appearance of the camera lens is not protruded.

In the present embodiment, the effective focal length f1 of the first lens and the radius of curvature R2 of the image side surface of the first lens satisfy: 11.0 < R2/f1 < -4.0. Satisfying this conditional expression, can guaranteeing that the focal power of first lens and second lens distributes in reasonable range to improve the image quality. Preferably, -10.6 < R2/f1 < -4.4.

In the present embodiment, the effective focal length f of the imaging system and the effective focal length f3 of the third lens satisfy: 2.5 < f3/f < 4.0. The condition is satisfied, the focal power distribution of the third lens can be ensured in a reasonable range, and the imaging quality of the camera system is improved. Preferably, 2.9 < f3/f < 4.0.

In the present embodiment, the effective focal length f2 of the second lens and the radius of curvature R3 of the object side surface of the second lens satisfy: -2.5 < f2/R3 < -1.5. Satisfying this conditional expression, not only can guaranteeing that the focal power distribution of second lens is in reasonable scope to improve camera system's image quality, can also guarantee the shape of second lens, thereby realize better processing nature. Preferably, -2.4 < f2/R3 < -1.8.

In the present embodiment, a radius of curvature R5 of the object side surface of the third lens and a radius of curvature R6 of the image side surface of the third lens satisfy: 3.5 < (R6+ R5)/(R6-R5) < 5.0. Satisfying this conditional expression, the shape of the third lens can be ensured, thereby achieving better workability. Preferably 3.5 < (R6+ R5)/(R6-R5) < 4.7.

In the present embodiment, a radius of curvature R6 of the image-side surface of the third lens and a radius of curvature R9 of the object-side surface of the fifth lens satisfy: 2.0 < R6/R9 < 6.5. Satisfying this conditional expression, the shape of the third lens and the shape of the fifth lens can be ensured, thereby achieving better workability. Preferably, 2.3 < R6/R9 < 6.2.

In the present embodiment, the effective focal length f of the imaging system and the radius of curvature R10 of the image-side surface of the fifth lens satisfy: f/R10 is more than 1.5 and less than 6.5. The condition is satisfied, the focal power distribution of the fifth lens can be ensured in a reasonable range, and the imaging quality of the camera system is improved. Preferably, 1.7 < f/R10 < 6.3.

In the present embodiment, the air interval T23 of the second lens and the third lens on the optical axis, the air interval T34 of the third lens and the fourth lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis satisfy: 4.0 < (T23+ T34)/CT3 < 5.5. The central thickness of the third lens and the air interval between the front lens and the rear lens can be controlled within a reasonable range by satisfying the conditional expression, so that the camera system is ensured to have better processing and assembling characteristics. Preferably 4.0 < (T23+ T34)/CT3 < 5.3.

In the present embodiment, the center thickness CT5 of the fifth lens on the optical axis and the air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: 2.5 < CT5/T45 < 14.5. The central thickness of the fifth lens and the distance between the fifth lens and the fourth lens can be ensured, and the processability and subsequent assembly of the fifth lens are ensured. Preferably, 2.6 < CT5/T45 < 14.2.

In the present embodiment, the combined focal length f12 of the first lens and the second lens and the effective focal length f of the imaging system satisfy: f12/f is more than 1.0 and less than 1.5. The condition is satisfied, the focal power distribution of the first lens and the second lens can be ensured in a reasonable range, and the imaging quality of the camera system is improved.

In the present embodiment, the central thickness CT2 of the second lens on the optical axis and the edge thickness ET2 of the second lens satisfy: 1.5 < ET2/CT2 < 2.0. Satisfying this conditional expression, the ratio of the center thickness to the edge thickness of the second lens can be ensured, thereby ensuring the molding of the second lens. Preferably, 1.6 < ET2/CT2 < 2.0.

In this embodiment, an on-axis distance SAG21 between an intersection point of the object side surface of the second lens and the optical axis to an effective radius vertex of the object side surface of the second lens and an on-axis distance SAG22 between an intersection point of the image side surface of the second lens and the optical axis to an effective radius vertex of the image side surface of the second lens satisfy: 2.5 < (SAG22+ SAG21)/(SAG22-SAG21) < 4.0. The method satisfies the conditional expression, can control the edge thickness and the bending degree of the second lens, and ensures the processability of the second lens. Preferably 2.6 < (SAG22+ SAG21)/(SAG22-SAG21) < 3.8.

In this embodiment, the on-axis distance SAG41 between the intersection of the object side surface of the fourth lens and the optical axis to the effective radius vertex of the object side surface of the fourth lens and the on-axis distance SAG51 between the intersection of the object side surface of the fifth lens and the optical axis to the effective radius vertex of the object side surface of the fifth lens satisfy: 0.5 is less than or equal to SAG41/SAG51 is less than 5.0. The method satisfies the conditional expression, can control the edge thickness of the fourth lens, the edge thickness of the fifth lens and the bending degree of the two lenses, and ensures the processability. Preferably 0.5. ltoreq. SAG41/SAG51 < 4.6.

In the present embodiment, an on-axis distance SAG52 between an intersection point of the image-side surface of the fifth lens and the optical axis to an effective radius vertex of the image-side surface of the fifth lens and an edge thickness ET5 of the fifth lens satisfies: -1.5 < SAG52/ET5 < 0.5. The thickness and the bending degree of the edge of the fifth lens can be controlled to ensure the processability of the fifth lens when the conditional expression is satisfied. Preferably, -1.3 < SAG52/ET5 < 0.3.

In the present embodiment, the effective focal length f of the imaging system satisfies: f is more than 10mm and less than 20 mm. The effective focal length f of the camera system is controlled within a reasonable range, so that the long-focus characteristic of the camera system is ensured. Preferably, 15.3mm < f < 15.9 mm.

In this embodiment, the imaging system further includes a reflection prism provided on the object side of the first lens. By providing the reflection prism, the reflection prism can turn back the light path, so that the total length of the telephoto imaging system does not become a limiting factor in designing the optical system, and the degree of freedom in design is increased.

Example two

As shown in fig. 1 to 36, the imaging system includes, in order from an object side to an image side along an optical axis, a first lens having a power, a diaphragm, a second lens, a third lens, a fourth lens, and a fifth lens; the second lens has negative focal power; the third lens has positive focal power; the fourth lens has positive focal power; the fifth lens has focal power; the image side surface of the first lens is a convex surface; the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the object side surface of the fifth lens is a convex surface; the effective focal length f of the camera system satisfies: f is more than 10mm and less than 20 mm; the on-axis distance TTL from the side surface of a shot object of the first lens to the imaging surface and the effective focal length f of the camera system meet the following requirements: TTL/f is less than or equal to 1.0.

Preferably, 15.3mm < f < 15.9 mm.

Through the focal power and the face type of each lens of reasonable setting, be favorable to controlling the trend of light, be favorable to the smooth transition of light, guarantee that imaging light can stably reach the imaging surface, increase imaging stability and imaging quality. Meanwhile, the characteristics of long focus and large aperture of the camera system can be ensured. The effective focal length f of the camera system is controlled within a reasonable range, so that the long-focus characteristic of the camera system is ensured. The ratio of the distance TTL between the axis of the object side face to the imaging face of the first lens to the effective focal length f of the camera system is controlled within a reasonable range, so that the total length of the camera system is short, the camera system is favorable for meeting miniaturization, the whole camera system is good, and the appearance of the camera lens is not protruded. In addition, the camera system adopts the periscopic lens to utilize the reflection principle of light to reflect the light directionally, and the prevention from the height is converted into a vertical or horizontal mode, so that the long-focus and miniaturized camera system is obtained.

In the present embodiment, the air interval T23 of the second lens and the third lens on the optical axis, the air interval T34 of the third lens and the fourth lens on the optical axis, and the central thickness CT3 of the third lens on the optical axis satisfy: 4.0 < (T23+ T34)/CT3 < 5.5. The central thickness of the third lens and the air interval between the third lens and the front lens and the rear lens can be controlled within a reasonable range when the conditional expression is met, and therefore the camera system is guaranteed to have better processing and assembling characteristics. Preferably 4.0 < (T23+ T34)/CT3 < 5.3.

The above-described image pickup system may further optionally include an optical filter for correcting color deviation or a protective glass for protecting the photosensitive element located on the image formation surface.

The imaging system in the present application may employ a plurality of lenses, such as the five lenses described above. By reasonably distributing the focal power, the surface shape, the central thickness of each lens, the axial distance between each lens and the like, the sensitivity of the lens can be effectively reduced, the machinability of the lens can be improved, and the camera system is more favorable for production and processing and can be suitable for portable electronic equipment such as a smart phone. The left side is the object side and the right side is the image side.

In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The aspheric lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality.

However, it will be appreciated by those skilled in the art that the number of lenses making up the imaging system can be varied to achieve the various results and advantages described in this specification without departing from the claimed subject matter. For example, although five lenses are exemplified in the embodiment, the image pickup system is not limited to including five lenses. The camera system may also include other numbers of lenses, as desired.

Examples of specific surface types and parameters applicable to the imaging system of the above embodiment are further described below with reference to the drawings.

It should be noted that any one of the following examples one to seven is applicable to all embodiments of the present application.

Example one

As shown in fig. 1 to 5, the image pickup system of the first example of the present application is described. Fig. 1 shows a schematic diagram of the configuration of an image pickup system of example one.

As shown in fig. 1, the imaging system, in order from an object side to an image side, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image plane S13.

The first lens element E1 has positive refractive power, and the object side surface S1 of the first lens element is a convex surface, and the image side surface S2 of the first lens element is a convex surface. The second lens element E2 has negative refractive power, and the object side surface S3 of the second lens element is convex, and the image side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, and the object side surface S5 of the third lens element is convex, and the image side surface S6 of the third lens element is concave. The fourth lens element E4 has positive refractive power, and the object side surface S7 of the fourth lens element is concave, and the image side surface S8 of the fourth lens element is convex. The fifth lens E5 has positive refractive power, and the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave. The filter E6 has a filter object side surface S11 and a filter image side surface S12. The light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging surface S13.

In this example, the total effective focal length f of the camera system is 15.38mm, the Semi-FOV of the maximum field angle of the camera system is 19.0 °, the total length TTL of the camera system is 15.43mm and the image height ImgH is 5.35 mm.

Table 1 shows a basic structural parameter table of the camera system of example one, in which the unit of the radius of curvature and the thickness/distance are millimeters (mm).

TABLE 1

In the first example, the object-side surface and the image-side surface of any one of the first lens E1 to the fifth lens E5 are aspheric surfaces, and the surface shape of each aspheric lens can be defined by, but is not limited to, the following aspheric surface formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below gives the high-order coefficient A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for each of the aspherical mirrors S1-S10 in example one.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-8.0801E-02

-3.2828E-02

-9.0323E-03

-2.2715E-03

-3.4535E-04

-5.9052E-05

-3.9630E-06

S2

7.5459E-03

-3.0009E-02

-2.9391E-03

1.2862E-03

-8.5359E-04

3.2878E-04

-1.7468E-04

S3

-3.7738E-01

2.9311E-02

-3.2363E-03

3.2371E-03

-6.1670E-04

5.3790E-05

-6.3665E-05

S4

-6.6400E-01

-4.7687E-02

-1.9791E-02

-3.2877E-03

-1.4052E-03

-6.3544E-04

-1.7551E-04

S5

1.9580E-01

5.9682E-03

-3.2301E-03

-1.4109E-03

-2.5797E-04

-2.3126E-04

-1.1286E-04

S6

2.0097E-01

1.8377E-02

7.9693E-04

-8.6384E-04

-1.2857E-04

-1.5344E-04

-9.2060E-05

S7

2.9788E-01

-4.8532E-02

4.7351E-03

-4.5401E-03

3.9593E-04

-5.4472E-04

-9.8373E-05

S8

1.9196E-01

-2.6836E-02

2.8486E-03

-1.9277E-03

1.1792E-03

-2.2708E-04

1.3837E-04

S9

-7.3579E-01

4.1509E-02

-1.0631E-02

2.8394E-03

1.1261E-03

-2.7835E-05

2.4021E-04

S10

-8.1910E-01

3.1628E-02

-1.4103E-02

1.4267E-03

-7.6271E-06

-8.2120E-06

8.3147E-05

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-3.7313E-06

-1.5236E-07

-8.9181E-07

4.4899E-07

2.7270E-07

-1.6297E-07

-5.1409E-07

S2

9.2194E-05

-4.9412E-05

2.5856E-05

-1.3056E-05

5.8228E-06

-3.3305E-06

1.2319E-06

S3

4.1892E-05

-1.8851E-05

8.4738E-06

-2.9291E-06

1.1911E-06

-2.1762E-07

-2.7606E-07

S4

-6.8866E-05

-1.9578E-05

-1.1765E-05

-2.6963E-06

-2.7668E-06

-8.8328E-07

-4.6535E-07

S5

-5.2455E-05

-2.1309E-05

-9.8729E-06

-4.3328E-06

-2.2753E-06

-1.1916E-06

-6.5263E-07

S6

-5.5865E-05

-2.4977E-05

-1.2885E-05

-4.8303E-06

-2.8201E-06

-9.2658E-07

-1.2200E-06

S7

-1.2775E-04

-4.4905E-05

-3.4908E-05

-1.4138E-05

-8.0854E-06

-3.9521E-06

-1.8425E-06

S8

-6.2054E-05

3.4956E-05

-1.8918E-05

8.8397E-06

-2.7933E-06

1.4866E-06

5.4344E-08

S9

-6.5831E-05

5.8772E-05

-2.9102E-05

1.6261E-05

-6.3376E-06

2.2225E-06

-6.1170E-07

S10

-1.3848E-05

2.2886E-05

-6.6213E-06

5.1740E-06

-1.0644E-06

5.6577E-07

6.4483E-08

TABLE 2

Fig. 2 shows an on-axis chromatic aberration curve of the imaging system of example one, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging system. Fig. 3 shows astigmatism curves of the imaging system of the first example, which represent meridional field curvature and sagittal field curvature. Fig. 4 shows distortion curves of the imaging system of the first example, which show distortion magnitude values corresponding to different angles of view. Fig. 5 shows a chromatic aberration of magnification curve of the imaging system of the first example, which represents the deviation of different image heights on the imaging plane after the light passes through the imaging system.

As can be seen from fig. 2 to 5, the imaging system of example one can achieve good imaging quality.

Example two

As shown in fig. 6 to 10, an image pickup system of example two of the present application is described. In this example and the following examples, descriptions of parts similar to example one will be omitted for the sake of brevity. Fig. 6 shows a schematic diagram of the configuration of the imaging system of example two.

As shown in fig. 6, the image capturing system comprises, in order from an object side to an image side: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image plane S13.

The first lens element E1 has positive refractive power, and the object side surface S1 of the first lens element is a convex surface, and the image side surface S2 of the first lens element is a convex surface. The second lens element E2 has negative refractive power, and the object side surface S3 of the second lens element is convex, and the image side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, and the object side surface S5 of the third lens element is convex, and the image side surface S6 of the third lens element is concave. The fourth lens element E4 has positive refractive power, and the object side surface S7 of the fourth lens element is concave, and the image side surface S8 of the fourth lens element is convex. The fifth lens element E5 has negative refractive power, and the object side surface S9 of the fifth lens element is convex, and the image side surface S10 of the fifth lens element is concave. The filter E6 has a filter object side surface S11 and a filter image side surface S12. The light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging surface S13.

In this example, the total effective focal length f of the camera system is 15.50mm, the Semi-FOV of the maximum field angle of the camera system is 18.9 °, the total length TTL of the camera system is 15.36mm and the image height ImgH is 5.35 mm.

Table 3 shows a basic structural parameter table of the camera system of example two, in which the unit of the radius of curvature and the thickness/distance are millimeters (mm).

TABLE 3

Table 4 shows the high-order term coefficients that can be used for each aspherical mirror surface in example two, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

TABLE 4

Fig. 7 shows an on-axis chromatic aberration curve of the imaging system of example two, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging system. Fig. 8 shows astigmatism curves of the imaging system of example two, which represent meridional field curvature and sagittal field curvature. Fig. 9 shows distortion curves of the imaging system of example two, which show values of distortion magnitudes corresponding to different angles of view. Fig. 10 shows a chromatic aberration of magnification curve of the imaging system of example two, which represents the deviation of different image heights on the imaging plane after the light passes through the imaging system.

As can be seen from fig. 7 to 10, the imaging system according to example two can achieve good imaging quality.

Example III

As shown in fig. 11 to 15, an image pickup system of the third example of the present application is described. Fig. 11 shows a schematic diagram of the configuration of the image pickup system of example three.

As shown in fig. 11, the imaging system, in order from an object side to an image side, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image plane S13.

In this example, the total effective focal length f of the camera system is 15.38mm, the Semi-FOV of the maximum field angle of the camera system is 18.8 °, the total length TTL of the camera system is 14.90mm and the image height ImgH is 5.32 mm.

Table 5 shows a basic structural parameter table of the camera system of example three, in which the unit of the radius of curvature and the thickness/distance are millimeters (mm).

TABLE 5

Table 6 shows the high-order term coefficients that can be used for each aspherical mirror surface in example three, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-5.8074E-02

-2.2314E-02

-6.9152E-03

-2.3608E-03

-6.5669E-04

-1.9662E-04

-4.9711E-05

S2

4.7213E-02

-1.6587E-02

-3.9401E-03

8.4730E-04

-6.3404E-04

2.0582E-04

-9.7533E-05

S3

-3.8825E-01

4.2069E-02

-9.0701E-03

2.4988E-03

-4.1041E-04

8.3376E-05

-2.1511E-05

S4

-6.1196E-01

-1.1172E-02

-1.4490E-02

-1.1282E-03

-5.3943E-04

-1.6186E-04

-3.8872E-05

S5

7.9005E-02

1.0935E-02

1.4765E-03

-3.3395E-04

2.1715E-04

3.9535E-05

9.4837E-06

S6

9.8295E-02

8.8211E-03

2.3760E-03

-4.5231E-04

1.4934E-04

7.1466E-05

3.7670E-05

S7

2.3828E-01

-4.9416E-02

4.2629E-03

-3.0490E-03

5.3041E-04

-8.5885E-05

9.2183E-05

S8

1.8658E-01

-4.7926E-02

1.3186E-03

-1.4919E-04

1.6213E-03

6.6062E-04

1.7628E-04

S9

-6.5497E-01

6.7688E-02

5.4633E-03

1.8814E-03

2.5889E-03

-8.1220E-04

2.8831E-04

S10

-7.2860E-01

7.0179E-02

-3.4118E-03

2.4361E-03

1.5394E-03

-3.9422E-04

3.3613E-04

Flour mark

A18

A20

A22

A24

A26

A28

A30

S1

-2.1401E-05

-5.8783E-06

0.0000E+00

S2

2.6459E-05

-3.9172E-06

0.0000E+00

S3

-8.2438E-06

1.1118E-05

-4.6691E-06

6.0698E-07

0.0000E+00

S4

-2.2957E-05

1.7945E-06

-1.1908E-06

-2.0734E-06

0.0000E+00

S5

-2.2570E-06

-2.2290E-06

-3.5876E-06

-1.2576E-06

0.0000E+00

S6

1.8964E-05

7.2191E-06

4.2396E-06

0.0000E+00

S7

2.2130E-06

2.2323E-05

-8.2816E-07

4.1892E-06

0.0000E+00

S8

8.8951E-05

-7.2020E-06

-5.0012E-06

-1.1886E-05

0.0000E+00

S9

-2.6163E-04

6.7604E-05

-5.2709E-05

2.3266E-05

0.0000E+00

S10

-1.7103E-04

6.9977E-05

-4.7988E-05

1.9385E-05

0.0000E+00

TABLE 6

Fig. 12 shows an on-axis chromatic aberration curve of the imaging system of example three, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging system. Fig. 13 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging system of example three. Fig. 14 shows distortion curves of the imaging system of example three, which show values of distortion magnitude corresponding to different angles of view. Fig. 15 shows a chromatic aberration of magnification curve of the imaging system of example three, which represents the deviation of different image heights on the imaging surface after the light passes through the imaging system.

As can be seen from fig. 12 to 15, the imaging system according to the third example can achieve good imaging quality.

Example four

As shown in fig. 16 to 20, an image pickup system of the present example four is described. Fig. 16 shows a schematic diagram of the configuration of the image pickup system of example four.

As shown in fig. 16, the imaging system, in order from an object side to an image side, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image plane S13.

In this example, the total effective focal length f of the camera system is 15.38mm, the Semi-FOV of the maximum field angle of the camera system is 19.0 °, the total length TTL of the camera system is 14.60mm and the image height ImgH is 5.35 mm.

Table 7 shows a basic structural parameter table of the imaging system of example four, in which the unit of the radius of curvature and the thickness/distance are millimeters (mm).

TABLE 7

Table 8 shows the high-order term coefficients that can be used for each aspherical mirror surface in example four, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-3.2415E-02

-1.6629E-02

-4.6904E-03

-1.5244E-03

-4.5877E-04

-1.5947E-04

-3.5171E-05

S2

8.9961E-02

-2.1284E-02

1.4307E-03

-7.1374E-04

-1.2796E-05

-4.7193E-05

2.8719E-05

S3

-3.3502E-01

2.3420E-02

-1.3871E-03

5.3481E-04

-1.4850E-04

-6.3618E-05

4.7800E-05

S4

-6.3423E-01

-3.6673E-02

-1.7250E-02

-3.4927E-03

-1.4323E-03

-4.5246E-04

-1.0279E-04

S5

1.2226E-01

4.2512E-03

-1.1910E-03

-5.0185E-05

1.7463E-04

-6.3407E-05

1.4831E-05

S6

1.4576E-01

9.1769E-03

-1.3584E-03

-2.6140E-04

1.4564E-04

7.3804E-06

-2.4604E-05

S7

3.3455E-01

-5.7295E-02

6.4199E-03

-5.6832E-03

1.8104E-03

-3.3928E-04

3.0426E-04

S8

2.4277E-01

-4.0570E-02

-2.8836E-03

-3.5087E-03

1.6614E-03

1.5471E-04

1.2627E-04

S9

-4.9318E-01

5.5840E-02

4.5981E-03

-1.0864E-03

3.8869E-03

-1.4287E-03

8.2450E-04

S10

-6.7156E-01

6.5220E-02

-7.7254E-03

4.0765E-03

7.5860E-04

2.4900E-04

-4.2250E-05

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-1.6334E-05

-4.3132E-06

-3.0825E-06

3.0529E-06

-3.6551E-06

5.6553E-06

-3.9868E-06

S2

-2.3355E-05

1.0558E-05

-4.6749E-06

8.0721E-07

-6.8232E-06

8.4751E-06

-2.5598E-06

S3

-4.0831E-05

1.9430E-05

-8.0592E-06

8.4090E-06

-7.9570E-06

1.1009E-05

-7.3613E-06

S4

-1.2295E-05

2.5936E-05

3.2702E-05

2.5493E-05

2.4259E-05

1.7917E-05

1.6195E-05

S5

-2.1257E-05

1.1913E-05

-1.1784E-05

8.2972E-06

-1.1841E-05

7.6219E-06

-1.7047E-06

S6

7.0833E-06

-1.8533E-05

-2.0932E-06

-9.7665E-06

-3.9623E-06

-1.6470E-05

7.2741E-06

S7

8.1720E-05

4.0688E-05

4.0466E-05

-1.2858E-05

7.1122E-07

5.9692E-06

-4.3354E-06

S8

3.0792E-04

-2.2002E-04

2.0058E-04

-1.5343E-04

1.2145E-04

-3.4364E-05

4.5071E-05

S9

-3.7262E-04

-3.0132E-05

1.4939E-04

-6.9060E-05

1.9246E-04

-3.5287E-05

8.1700E-05

S10

-3.5749E-05

-1.7726E-04

1.2415E-04

-4.3918E-05

1.3504E-04

-1.1225E-06

6.0838E-05

TABLE 8

Fig. 17 shows an on-axis chromatic aberration curve of the imaging system of example four, which shows the deviation of the convergent focus of light rays of different wavelengths after passing through the imaging system. Fig. 18 shows astigmatism curves of the imaging system of example four, which represent meridional field curvature and sagittal field curvature. Fig. 19 shows distortion curves of the imaging system of example four, which indicate distortion magnitude values corresponding to different angles of view. Fig. 20 shows a chromatic aberration of magnification curve of the imaging system of example four, which represents the deviation of different image heights on the imaging plane after the light passes through the imaging system.

As can be seen from fig. 17 to 20, the imaging system according to example four can achieve good imaging quality.

Example five

As shown in fig. 21 to 25, an image pickup system of the present example five is described. Fig. 21 shows a schematic diagram of the configuration of the image pickup system of example five.

As shown in fig. 21, the imaging system, in order from an object side to an image side, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image plane S13.

In this example, the total effective focal length f of the camera system is 15.80mm, the Semi-FOV of the maximum field angle of the camera system is 18.5 °, the total length TTL of the camera system is 15.70mm and the image height ImgH is 5.35 mm.

Table 9 shows a basic structural parameter table of the camera system of example five, in which the unit of the radius of curvature and the thickness/distance are millimeters (mm).

TABLE 9

Table 10 shows the high-order term coefficients that can be used for each aspherical mirror surface in example five, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Watch 10

Fig. 22 shows an on-axis chromatic aberration curve of the imaging system of example five, which represents the convergent focus deviation of light rays of different wavelengths after passing through the imaging system. Fig. 23 shows astigmatism curves of the imaging system of example five, which represent meridional field curvature and sagittal field curvature. Fig. 24 shows distortion curves of the image pickup system of example five, which show distortion magnitude values corresponding to different angles of view. Fig. 25 shows a chromatic aberration of magnification curve of the imaging system of example five, which represents the deviation of different image heights on the imaging surface of the light ray after passing through the imaging system.

As can be seen from fig. 22 to 25, the imaging system according to example five can achieve good imaging quality.

Example six

As shown in fig. 26 to 30, an image pickup system of a sixth example of the present application is described. Fig. 26 shows a schematic diagram of the configuration of the image pickup system of example six.

As shown in fig. 26, the imaging system, in order from an object side to an image side, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image plane S13.

The first lens element E1 has positive refractive power, and the object side surface S1 of the first lens element is a convex surface, and the image side surface S2 of the first lens element is a convex surface. The second lens element E2 has negative refractive power, and the object side surface S3 of the second lens element is convex, and the image side surface S4 of the second lens element is concave. The third lens element E3 has positive refractive power, and the object side surface S5 of the third lens element is convex, and the image side surface S6 of the third lens element is concave. The fourth lens element E4 has positive refractive power, and the object side surface S7 of the fourth lens element is concave, and the image side surface S8 of the fourth lens element is convex. The fifth lens element E5 has negative power, and the object side surface S9 of the fifth lens element is convex and the image side surface S10 of the fifth lens element is concave. The filter E6 has a filter object side surface S11 and a filter image side surface S12. The light from the object passes through the respective surfaces S1 to S12 in order and is finally imaged on the imaging surface S13.

In this example, the total effective focal length f of the camera system is 15.40mm, the Semi-FOV of the maximum field angle of the camera system is 19.0 °, the total length TTL of the camera system is 14.98mm and the image height ImgH is 5.35 mm.

Table 11 shows a basic structural parameter table of the imaging system of example six, in which the unit of the radius of curvature and the thickness/distance are millimeters (mm).

TABLE 11

Table 12 shows the high-order term coefficients that can be used for each of the aspherical mirror surfaces in example six, wherein each aspherical mirror surface type can be defined by formula (1) given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-1.1575E-01

-6.0941E-02

-2.6002E-02

-1.0753E-02

-3.7076E-03

-1.1952E-03

-3.0063E-04

S2

6.1683E-03

-5.2898E-02

-1.3602E-02

-1.2115E-03

-1.4785E-03

2.5413E-04

-1.8617E-04

S3

-5.3360E-01

6.6321E-02

-7.7690E-03

5.6472E-03

-1.6398E-04

2.8004E-04

-1.2465E-05

S4

-8.7708E-01

-6.0974E-02

-3.5271E-02

-8.6685E-03

-3.8836E-03

-1.7142E-03

-7.4181E-04

S5

1.1688E-01

1.9572E-02

3.6140E-03

9.6880E-04

7.4802E-04

1.0977E-04

-3.6654E-05

S6

1.3643E-01

1.5539E-02

3.0357E-03

2.9660E-04

9.7036E-04

5.0366E-04

3.2771E-04

S7

3.0960E-01

-7.8401E-02

2.8671E-03

-3.2611E-03

3.3868E-03

1.2623E-03

1.1547E-03

S8

2.0439E-01

-4.8730E-02

-3.3759E-03

1.6163E-03

2.6671E-03

1.1612E-03

4.1398E-04

S9

-6.9929E-01

8.9037E-02

1.1440E-02

5.2792E-03

4.1109E-03

-1.5589E-03

3.0804E-04

S10

-7.4334E-01

6.6818E-02

1.8888E-03

2.5152E-03

3.3373E-03

-5.8839E-04

7.5572E-04

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-6.1372E-05

8.8488E-06

0.0000E+00

S2

5.4241E-05

-5.2304E-05

0.0000E+00

S3

-2.4258E-05

-3.9421E-05

-2.5650E-05

3.4711E-06

0.0000E+00

S4

-3.7164E-04

-1.7791E-04

-8.4917E-05

-2.6148E-05

0.0000E+00

S5

-6.9117E-05

-6.6879E-05

-2.6483E-05

-1.2211E-05

0.0000E+00

S6

1.7922E-04

7.5884E-05

2.1035E-05

0.0000E+00

S7

5.3659E-04

3.0366E-04

9.5455E-05

4.3041E-05

0.0000E+00

S8

2.4766E-04

4.7791E-05

1.0786E-05

-1.8616E-05

0.0000E+00

S9

-5.1158E-04

1.3219E-04

-8.3514E-05

4.4507E-05

0.0000E+00

S10

-2.5154E-04

1.7312E-04

-7.7508E-05

3.0801E-05

0.0000E+00

TABLE 12

Fig. 27 shows an on-axis chromatic aberration curve of the imaging system of example six, which represents the convergent focus deviation of light rays of different wavelengths after passing through the imaging system. Fig. 28 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging system of example six. Fig. 29 shows distortion curves of the imaging system of example six, which indicate values of distortion magnitudes corresponding to different angles of view. Fig. 30 shows a chromatic aberration of magnification curve of the imaging system of example six, which represents the deviation of different image heights on the imaging plane after the light passes through the imaging system.

As can be seen from fig. 27 to 30, the imaging system according to example six can achieve good imaging quality.

Example seven

As shown in fig. 31 to 35, an image pickup system of a seventh example of the present application is described. Fig. 31 shows a schematic diagram of the configuration of an image pickup system of example seven.

As shown in fig. 31, the imaging system, in order from an object side to an image side, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image plane S13.

In this example, the total effective focal length f of the camera system is 15.60mm, the Semi-FOV of the maximum field angle of the camera system is 17.6 °, the total length TTL of the camera system is 14.00mm and the image height ImgH is 5.35 mm.

Table 13 shows a basic structural parameter table of the imaging system of example seven, in which the unit of the radius of curvature and the thickness/distance are millimeters (mm).

Watch 13

Table 14 shows the high-order term coefficients that can be used for each of the aspherical mirror surfaces in example seven, wherein each of the aspherical mirror surface types can be defined by formula (1) given in example one above.

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-1.7390E-02

-2.4102E-02

-9.7177E-03

-3.8481E-03

-1.4937E-03

-4.6002E-04

-2.1434E-04

S2

3.6703E-02

-1.6948E-02

-5.2895E-03

4.0818E-04

-1.1057E-03

2.0922E-04

-2.8845E-04

S3

-4.2224E-01

5.0833E-02

-5.9837E-03

2.2410E-03

-1.6539E-04

-3.9543E-05

-7.6405E-05

S4

-5.2878E-01

6.1007E-03

-9.9414E-03

-2.2459E-03

-5.7158E-04

-4.9812E-04

6.7089E-05

S5

1.1064E-01

2.0957E-02

5.2620E-03

-4.8098E-04

2.4258E-04

-6.1624E-04

-1.3850E-04

S6

1.1295E-01

8.3661E-03

5.5969E-03

3.0691E-04

7.5209E-04

-3.6365E-04

-1.1830E-04

S7

3.0464E-01

-5.6795E-02

4.4310E-03

-3.7284E-03

2.1718E-03

-4.1987E-04

2.5179E-04

S8

1.4939E-01

-3.1665E-02

-9.5944E-03

-9.1618E-04

2.0118E-03

-8.2417E-05

2.0575E-04

S9

-5.4915E-01

4.0560E-02

-7.4797E-03

-3.8923E-03

5.4467E-03

-1.7689E-03

1.4676E-03

S10

-3.5083E-01

3.7095E-02

5.9565E-03

-6.2119E-03

5.9733E-03

-3.1312E-03

2.1631E-03

Flour mark

A4

A6

A8

A10

A12

A14

A16

S1

-9.7339E-05

-3.4227E-05

0.0000E+00

S2

1.4142E-04

-3.2576E-05

0.0000E+00

S3

9.4419E-05

1.6410E-05

-2.0231E-05

2.9278E-06

0.0000E+00

S4

1.5740E-04

8.3361E-05

7.3230E-06

-7.9825E-06

0.0000E+00

S5

1.1408E-05

1.3509E-05

-1.2330E-05

-1.7345E-07

0.0000E+00

S6

-3.4284E-05

-5.1868E-07

-7.2972E-06

0.0000E+00

S7

3.6473E-05

8.5988E-05

2.2767E-06

3.8408E-06

0.0000E+00

S8

9.7142E-05

7.3464E-05

7.1157E-06

-2.4775E-05

0.0000E+00

S9

-4.0885E-04

3.0469E-04

-1.0444E-04

2.5312E-05

0.0000E+00

S10

-7.1525E-04

7.7203E-04

-4.0066E-05

2.2861E-04

0.0000E+00

TABLE 14

Fig. 32 shows an on-axis chromatic aberration curve of the imaging system of example seven, which represents the convergent focus deviation of light rays of different wavelengths after passing through the imaging system. Fig. 33 shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging system of example seven. Fig. 34 shows distortion curves of the imaging system of example seven, which indicate values of distortion magnitudes corresponding to different angles of view. Fig. 35 shows a chromatic aberration of magnification curve of the imaging system of example seven, which represents the deviation of different image heights on the imaging plane after the light passes through the imaging system.

As can be seen from fig. 32 to 35, the imaging system according to example seven can achieve good imaging quality.

To sum up, examples one to seven respectively satisfy the relationships shown in table 15.

Table 15 table 16 gives effective focal lengths f of the imaging systems of example one to example seven, effective focal lengths f1 to f5 of the respective lenses, and the like.

Parameter/example	1	2	3	4	5	6	7
								f(mm)	15.38	15.50	15.38	15.38	15.80	15.40	15.60
f1(mm)	7.64	7.66	7.35	7.34	7.62	7.54	7.10
								f2(mm)	-8.99	-8.94	-8.66	-7.98	-8.47	-8.80	-8.31
f3(mm)	48.06	49.28	45.07	60.71	57.34	49.46	48.78
								f4(mm)	7653.21	145.77	71.98	311.78	86.49	170.83	79.12
f5(mm)	237.17	-262.30	-52.66	219.51	-763.02	-149.03	-30.66
								TTL(mm)	15.43	15.36	14.90	14.60	15.70	14.98	14.00
ImgH(mm)	5.35	5.35	5.32	5.35	5.35	5.35	5.35
								Semi-FOV(°)	19.0	18.9	18.8	19.0	18.5	19.0	17.6
SAG51(mm)	15.38	15.50	15.38	15.38	15.80	15.40	15.60

TABLE 16

The present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging apparatus is equipped with the above-described image pickup system.

It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An imaging system comprising, in order from an object side to an image side along an optical axis:

a first lens having an optical power;

a diaphragm;

a second lens having a negative optical power;

a third lens having a positive optical power;

a fourth lens having a positive optical power;

a fifth lens having an optical power;

the image side surface of the first lens is a convex surface; the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the object side surface of the fifth lens is a convex surface.

2. The image capture system of claim 1, wherein a maximum field angle FOV of the image capture system satisfies: FOV is less than 40 ℃.

3. The camera system of claim 1, wherein an effective focal length f of the camera system and an entrance pupil diameter EPD of the camera system satisfy: f/EPD < 2.5.

4. The image capturing system according to claim 1, wherein an on-axis distance TTL from the object side surface to the imaging surface of the first lens to the effective focal length f of the image capturing system satisfies: TTL/f is less than or equal to 1.0.

5. The imaging system of claim 1, wherein an effective focal length f1 of the first lens and a radius of curvature R2 of an image side surface of the first lens satisfy: 11.0 < R2/f1 < -4.0.

6. The image capture system of claim 1, wherein an effective focal length f3 of the third lens and an effective focal length f of the image capture system satisfy: 2.5 < f3/f < 4.0.

7. The image capturing system according to claim 1, wherein an effective focal length f2 of the second lens and a radius of curvature R3 of an object side surface of the second lens satisfy: -2.5 < f2/R3 < -1.5.

8. The imaging system according to claim 1, wherein a radius of curvature R5 of an object side surface of the third lens and a radius of curvature R6 of an image side surface of the third lens satisfy: 3.5 < (R6+ R5)/(R6-R5) < 5.0.

9. The imaging system according to claim 1, wherein a radius of curvature R6 of an image-side surface of the third lens and a radius of curvature R9 of an object-side surface of the fifth lens satisfy: 2.0 < R6/R9 < 6.5.

10. The imaging system according to claim 1, wherein an effective focal length f of the imaging system and a radius of curvature R10 of an image side surface of the fifth lens satisfy: f/R10 is more than 1.5 and less than 6.5.

11. The imaging system according to claim 1, wherein an air interval T23 of the second lens and the third lens on the optical axis, an air interval T34 of the third lens and the fourth lens on the optical axis, and a center thickness CT3 of the third lens on the optical axis satisfy: 4.0 < (T23+ T34)/CT3 < 5.5.

12. The imaging system according to claim 1, wherein a center thickness CT5 of the fifth lens on the optical axis and an air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: 2.5 < CT5/T45 < 14.5.

13. The imaging system of claim 1, wherein a combined focal length f12 of the first and second lenses, an effective focal length f of the imaging system, satisfies: f12/f is more than 1.0 and less than 1.5.

14. The imaging system of claim 1, wherein a center thickness CT2 of the second lens on the optical axis and an edge thickness ET2 of the second lens satisfy: 1.5 < ET2/CT2 < 2.0.

15. The imaging system according to claim 1, wherein an on-axis distance SAG21 between an intersection point of the object-side surface of the second lens and the optical axis to an effective radius vertex of the object-side surface of the second lens and an on-axis distance SAG22 between an intersection point of the image-side surface of the second lens and the optical axis to an effective radius vertex of the image-side surface of the second lens satisfy: 2.5 < (SAG22+ SAG21)/(SAG22-SAG21) < 4.0.

16. The image capturing system according to claim 1, wherein an on-axis distance SAG41 between an intersection of the object-side surface of the fourth lens and the optical axis and an effective radius vertex of the object-side surface of the fourth lens and an on-axis distance SAG51 between an intersection of the object-side surface of the fifth lens and the optical axis and an effective radius vertex of the object-side surface of the fifth lens satisfy: 0.5 is less than or equal to SAG41/SAG51 is less than 5.0.

17. The imaging system according to claim 1, wherein an on-axis distance SAG52 between an intersection point of the image-side surface of the fifth lens and the optical axis and an effective radius vertex of the image-side surface of the fifth lens and an edge thickness ET5 of the fifth lens satisfies: -1.5 < SAG52/ET5 < 0.5.

18. The camera system of claim 1, wherein the effective focal length f of the camera system satisfies: f is more than 10mm and less than 20 mm.

19. The image capturing system according to claim 1, further comprising a reflection prism provided on an object side of the first lens.

20. An imaging system comprising, in order from an object side to an image side along an optical axis:

a first lens having an optical power;

a diaphragm;

a second lens having a negative optical power;

a third lens having a positive optical power;

a fourth lens having a positive optical power;

a fifth lens having an optical power;

the image side surface of the first lens is a convex surface; the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the object side surface of the fifth lens is a convex surface; the effective focal length f of the camera system satisfies: f is more than 10mm and less than 20 mm; the axial distance TTL from the side surface of the shot object of the first lens to the imaging surface and the effective focal length f of the camera system meet the following conditions: TTL/f is less than or equal to 1.0.

21. The camera system according to claim 20, wherein a maximum field angle FOV of the camera system satisfies: FOV is less than 40 ℃.

22. The camera system of claim 20, wherein an effective focal length f of the camera system and an entrance pupil diameter EPD of the camera system satisfy: f/EPD < 2.5.

23. The imaging system of claim 20, wherein an effective focal length f1 of the first lens and a radius of curvature R2 of an image side surface of the first lens satisfy: 11.0 < R2/f1 < -4.0.

24. The camera system of claim 20, wherein an effective focal length f3 of the camera system and an effective focal length f of the third lens satisfies: 2.5 < f3/f < 4.0.

25. The image capturing system according to claim 20, wherein an effective focal length f2 of the second lens and a radius of curvature R3 of an object side surface of the second lens satisfy: -2.5 < f2/R3 < -1.5.

26. The image capturing system according to claim 20, wherein a radius of curvature R5 of the object-side surface of the third lens and a radius of curvature R6 of the image-side surface of the third lens satisfy: 3.5 < (R6+ R5)/(R6-R5) < 5.0.

27. The imaging system according to claim 20, wherein a radius of curvature R6 of an image side surface of the third lens and a radius of curvature R9 of an object side surface of the fifth lens satisfy: 2.0 < R6/R9 < 6.5.

28. The image capturing system of claim 20, wherein an effective focal length f of the image capturing system and a radius of curvature R10 of an image side surface of the fifth lens satisfy: f/R10 is more than 1.5 and less than 6.5.

29. The imaging system according to claim 20, wherein an air interval T23 of the second lens and the third lens on the optical axis, an air interval T34 of the third lens and the fourth lens on the optical axis, and a center thickness CT3 of the third lens on the optical axis satisfy: 4.0 < (T23+ T34)/CT3 < 5.5.

30. The imaging system of claim 20, wherein a center thickness CT5 of the fifth lens on the optical axis and an air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: 2.5 < CT5/T45 < 14.5.

31. The camera system of claim 20, wherein a combined focal length f12 of the first and second lenses, an effective focal length f of the camera system, satisfies: f12/f is more than 1.0 and less than 1.5.

32. The imaging system of claim 20, wherein a center thickness CT2 of the second lens on the optical axis and an edge thickness ET2 of the second lens satisfy: 1.5 < ET2/CT2 < 2.0.

33. The imaging system according to claim 20, wherein an on-axis distance SAG21 between an intersection point of the object-side surface of the second lens and the optical axis to an effective radius vertex of the object-side surface of the second lens and an on-axis distance SAG22 between an intersection point of the image-side surface of the second lens and the optical axis to an effective radius vertex of the image-side surface of the second lens satisfy: 2.5 < (SAG22+ SAG21)/(SAG22-SAG21) < 4.0.

34. The imaging system according to claim 20, wherein an on-axis distance SAG41 between an intersection point of the object side surface of the fourth lens and the optical axis and an effective radius vertex of the object side surface of the fourth lens and an on-axis distance SAG51 between an intersection point of the object side surface of the fifth lens and the optical axis and an effective radius vertex of the object side surface of the fifth lens satisfy: 0.5 is less than or equal to SAG41/SAG51 is less than 5.0.

35. The imaging system according to claim 20, wherein an on-axis distance SAG52 between an intersection point of the image-side surface of the fifth lens and the optical axis and an effective radius vertex of the image-side surface of the fifth lens and an edge thickness ET5 of the fifth lens satisfies: -1.5 < SAG52/ET5 < 0.5.

36. The image capturing system according to claim 20, further comprising a reflection prism provided on an object side of the first lens.