CN209690596U

CN209690596U - Optical imaging system

Info

Publication number: CN209690596U
Application number: CN201920387444.3U
Authority: CN
Inventors: 赵镛主; 康永锡
Original assignee: Samsung Electro Mechanics Co Ltd
Current assignee: Samsung Electro Mechanics Co Ltd
Priority date: 2018-03-27
Filing date: 2019-03-25
Publication date: 2019-11-26
Anticipated expiration: 2029-03-25
Also published as: KR20190113496A

Abstract

Provide a kind of optical imaging system.The optical imaging system has the first lens, the second lens, the third lens and the 4th lens of sequence setting from the object side to the image side.The optical imaging system meets conditional expression below: No.≤1.5 F, 0.5 < EPD/TTL < 0.7, wherein EPD is Entry pupil diameters, and TTL is from the object side surface of first lens to the distance on optical axis of imaging surface, and F No. is the F number of the optical imaging system.According to the utility model, realize with small size and under low light conditions to the optical imaging system of subject imaging.

Description

Optical imaging system

This application claims Korea Spro 10-2018-0034965 submitted on March 27th, 2018 in Korean Intellectual Property Office State's patent application and in the 10-2018-0091268 Korean Patent submitted in Korean Intellectual Property Office on the 6th of August in 2018 The complete disclosure of the equity of the priority of application, the South Korea patent application is incorporated herein by reference for all purposes This.

Technical field

This application involves a kind of optical imaging systems for realizing bright image.

Background technique

There is relatively short length in the magazine optical system being mounted on Miniature Terminal device.Accordingly, it is possible to It can be difficult to realize low F number (F No.), and may can not be from the camera for Miniature Terminal device under low light conditions Obtain high-definition picture.

Utility model content

The content of the present invention is provided to be introduced according to design of the simplified form to selection, is being embodied below The design is further described in mode.The content of the present invention is both not intended to determine the key feature of theme claimed Or essential feature, it is also not intended to be used as the range for assisting in theme claimed.

In order to solve to be difficult to realize low F number and may can not be from for Miniature Terminal device under low light conditions Camera the problem of obtaining high-definition picture, the utility model, which provides, a kind of has small size and right under low light conditions The optical imaging system of subject imaging.

In a general way, a kind of optical imaging system includes the first lens of sequence setting, the from the object side to the image side Two lens, the third lens and the 4th lens, wherein the optical imaging system can meet conditional expression below: F No.≤ 1.5,0.5 < EPD/TTL < 0.7, wherein EPD is Entry pupil diameters, and TTL be from the object side surfaces of first lens at The distance on optical axis of image planes, F No. are the F number of the optical imaging system.

First lens can have positive refractive power.

Second lens can have positive refractive power.

The third lens can have positive refractive power.

4th lens can have negative refractive power.

First lens can have recessed image interface.

Second lens can have the image interface of protrusion.

4th lens can have recessed object side surface.

The half of the catercorner length of the imaging surface of the optical imaging system is smaller than effectively the half of the 4th lens Diameter.

In another general aspect, a kind of optical imaging system includes multiple lens of sequence setting from the object side to the image side, Wherein, the optical imaging system can meet conditional expression below: F No.≤1.5,4.0 < (f1+f2)/f < 8.0, In, f is the total focal length of the optical imaging system, and f1 is closest to the focal length of the first lens of object space setting, and f2 be with The focal length for the second lens that first lens are disposed adjacent, F No. are the F number of the optical imaging system.

The multiple lens may include four lens.

First lens and second lens can have positive refractive power.

The optical imaging system can meet conditional expression below: 1.0 < TTL/f < 2.0, wherein TTL is from described Distance on optical axis of the object side surface of first lens to imaging surface.

The optical imaging system can meet conditional expression below: 0.3 < R1/TTL < 5.0, wherein R1 is described The radius of curvature of the object side surface of one lens, and TTL is from the object side surfaces of first lens to imaging surface in optical axis On distance.

The optical imaging system can meet conditional expression below: 0.5 < f3/f < 0.8, wherein f3 is and described The focal length for the third lens that two lens are disposed adjacent.

The optical imaging system can meet conditional expression below: -2.0 < f4/f < -0.5, wherein f4 is and third The focal length for the 4th lens that lens are disposed adjacent, wherein the third lens are disposed adjacent with second lens.

The optical imaging system can meet conditional expression below: -0.5 < R1/R3 < 1.0, wherein R1 is described The radius of curvature of the object side surface of one lens, and R3 is the radius of curvature of the object side surface of second lens.

The optical imaging system can also meet No. < 1.5 0.8 < F of conditional expression.

The distance on optical axis of imaging surface from the object side surface of first lens to the optical imaging system can In the range of 2.5mm to 4.0mm.

Optical imaging system according to the present utility model can have small size and under low light conditions to subject at Picture.

By following specific embodiments, drawings and claims, other features and aspect be will be apparent.

Detailed description of the invention

Fig. 1 is the first exemplary diagram for showing optical imaging system；

Fig. 2 shows the examples of the aberration curve of optical imaging system shown in Fig. 1；

Fig. 3 shows the second example of optical imaging system；

Fig. 4 shows the example of the aberration curve of optical imaging system shown in Fig. 3；

Fig. 5 shows the third example of optical imaging system；And

Fig. 6 shows the example of the aberration curve of optical imaging system shown in Fig. 5.

Throughout the drawings and the detailed description, unless otherwise described or provided, otherwise identical appended drawing reference will be by It is interpreted as indicating identical element, feature and structure.In order to clear, explanation and it is convenient for the sake of, attached drawing can not to scale draw, And the relative size, ratio and description of the element in attached drawing can be exaggerated.

Specific embodiment

Hereinafter, embodiment of the disclosure described below with reference to the accompanying drawings.

Following specific embodiments are provided to help reader to obtain to method as described herein, equipment and/or system Comprehensive understanding.However, after understanding disclosure of this application, the various changes of method, equipment and/or system as described herein It changes, modify and equivalent will be apparent.For example, operation order as described herein is only example, do not limit to In sequence set forth herein, but other than the operation in addition to that must occur in a specific order, it can make and understand the application's It will be apparent changing after disclosure.In addition, can be omitted as known in the art to improve clearness and terseness The description of feature.

Feature as described herein can be implemented in different forms, and will not be interpreted to be shown by as described herein Example limitation.More precisely, providing example as described herein is only to show after understanding disclosure of this application It will be apparent implementing method as described herein, some modes in many feasible modes of equipment and/or system.

Although such as term of " first " or " second " can be used for illustrating various assemblies, component is not by the limit of term System.Each term in these terms is not intended to limit essence, the order or sequence of corresponding component, and may be only to use It is distinguished in by corresponding component and other components.For example, in the interest field according to exemplary design, " first " component It is referred to alternatively as " second " component, or similarly, " second " component is referred to alternatively as " first " component.

Throughout the specification, when such as element of layer, region or substrate be described as " being located at " another element "upper", When " being connected to " another element or " being integrated to " another element, which can direct " being located at " another element "upper", " being connected to " Another element or " being integrated to " another element, or one or more other elements to fall between may be present.It compares Under, when element is described as " located immediately at " another element "upper", " being directly connected to " another element or " being bonded directly to " When another element, the other elements to fall between may not be present.

Term used herein is used only for the purpose of describing specific embodiments, and is not intended to be limited.For example, such as at this In used in, unless the context clearly dictates otherwise, otherwise singular is also intended to include plural form.It will also be understood that , term "comprising" and/or " comprising " enumerate that there are the feature, integer, step, behaviour when using in the present specification Work, element, component or their combination, but do not preclude the presence or addition of other one or more features, integer, step, behaviour Work, element, component or their group.

In the accompanying drawings, for the ease of explaining, slightly exaggerating the thickness of lens, size and shape.Specifically, by showing The mode of example shows the shape of spherical face shown in the drawings or non-spherical surface.That is, spherical face or aspherical The shape on surface is not limited to shape shown in the drawings.

Throughout the specification, the unit of the radius of curvature of lens, thickness, distance and focal length etc. is " millimeter ", angle Unit is " degree ".

Throughout the specification, the shape of lens refers to the shape of the near axis area of lens.For example, the object space of the first lens The concept of surface protrusion means the near axis area protrusion of the object side surface of the first lens.Therefore, when the object space table of description lens When face is protruded, it is not offered as the entire object side surface protrusion of lens.For example, even if in the image interface tool for describing the first lens When having concave shape, the edge of the image interface of the first lens can also have convex shape.Above-mentioned near axis area can refer to The region of optical axis.

In the exemplary embodiment, optical imaging system may include the multiple lens being arranged along optical axis.For example, optics at As system may include the first lens, the second lens, the third lens and the 4th lens being for example arranged along optical axis sequence.First thoroughly Mirror can refer to the lens being arranged closest to object (or subject), and the 4th lens can refer to set adjacent to imaging surface or imaging sensor The lens set.

In the following description, optical imaging system will be described in further detail.

Optical imaging system may include multiple lens.For example, optical imaging system may include from object space towards image space sequence The first lens, the second lens, the third lens and the 4th lens being arranged.

Optical imaging system may also include imaging sensor and optical filter.Imaging sensor can form imaging surface, and can Electric signal will be converted by the first lens to the light that the 4th lens reflect.Optical filter may be provided between lens and imaging surface, and And the infrared light for being incident on imaging surface can be stopped.

Optical imaging system may also include diaphragm and spacer.Diaphragm may be provided at the front area (object space) of the first lens In or be arranged between lens, but not limited to this, and the adjustable light being incident on imaging surface of diaphragm.Spacer may be provided at Between lens and gap between lens can be kept.Spacer can be formed using light screening material so that spacer can stop it is non- Necessary light penetrates the rib of lens.

In the following description, lens included in optical imaging system will be described in further detail.

First lens can have refractive power.For example, the first lens can have positive refractive power.First lens can have in protrusion One surface of shape.For example, the object side surface of the first lens can have convex shape.First lens may include aspherical table Face.For example, a surface of the first lens can be non-spherical surface.

Second lens can have refractive power.For example, the second lens can have positive refractive power.Second lens can have protrusion Surface.For example, the image interface of the second lens can have convex shape.Second lens can have spherical face or aspherical table Face.For example, two surfaces of the second lens can be spherical face or non-spherical surface.

The third lens can have refractive power.For example, the third lens can have positive refractive power.The third lens can have recessed Surface.For example, the object side surface of the third lens can have concave shape.The third lens may include non-spherical surface.For example, third A surface or two surfaces for lens can be non-spherical surface.

4th lens can have refractive power.For example, the 4th lens can have negative refractive power.One surface of the 4th lens can With concave shape.For example, at least one surface in the object side surface and image interface of the 4th lens can have concave shape. 4th lens can be in the shape with inflection point.For example, inflection point may be formed in the object side surface and image interface of the 4th lens On at least one surface.Therefore, at least one surface of the 4th lens may be configured such that near axis area shape can with it is outer The shape in all regions is different.For example, the 4th lens may be configured such that near axis area can be recessed, and the edge of near axis area (that is, outer region on the outside of near axis area) can be protruded.4th lens may include non-spherical surface.For example, the one of the 4th lens A surface can be non-spherical surface.

In addition, the F No. of optical imaging system may be less than or equal to 1.5.Preferably, F No. satisfaction will be described below Conditional expression 8.

The non-spherical surface of first lens to the 4th lens can be indicated by following formula 1.

Formula 1:

In equation 1 above, " c " is the curvature (inverse of radius of curvature) of lens, and " K " is the constant of the cone, " Y " be perpendicular to From certain point on the non-spherical surface of lens to the distance of optical axis on the direction of the optical axis of lens, constant " A " to " H " is aspherical Surface constants." Z " (or SAG) indicate from the non-spherical surface of lens away from optical axis distance be Y certain point to the aspherical table The distance of the tangent plane of the vertex intersection in face in the direction of the optical axis.

Optical imaging system can meet one or more in the following conditions expression formula:

In above conditional expression, TTL be from the object side surfaces of the first lens to imaging surface on optical axis away from From f is the total focal length of optical imaging system, and R1 is the radius of curvature of the object side surface of the first lens, and EPD is Entry pupil diameters, f1 It is the focal length of the first lens, f2 is the focal length of the second lens, and f3 is the focal length of the third lens, and f4 is the focal length of the 4th lens, R3 It is the radius of curvature of the object side surface of the second lens, and F No. (F number) is the total focal length and Entry pupil diameters of optical imaging system The ratio between.

In the following description, the example of optical imaging system will be described.

First example

Fig. 1 is the first exemplary diagram for showing optical imaging system.Fig. 2 shows optical imagery systems shown in Fig. 1 The example of the aberration curve of system.

Optical imaging system 100 as shown in Figure 1 may include the first lens 110, the second lens 120, the third lens 130 With the 4th lens 140.

First lens 110 can have positive refractive power, and can have protrusion object side surface and recessed image interface.The Two lens 120 can have positive refractive power, and can have the object side surface of protrusion and the image interface of protrusion.The third lens 130 There can be positive refractive power, and there can be the image interface of recessed object side surface and protrusion.4th lens 140 can have negative bend Luminous power, and can have recessed object side surface and recessed image interface.4th lens 140 can have in object side surface and picture The shape of inflection point is formed in square surface.

Optical imaging system 100 may also include diaphragm ST, optical filter 150 and imaging sensor 160.Diaphragm ST may be provided at First lens 110 are on the front area of object space, and the amount of the adjustable light for being incident on imaging sensor 160.Optical filter 150 It may be provided between the 4th lens 140 and imaging sensor 160, and infrared light can be stopped.Imaging sensor 160 can be formed into Image planes, subject can be imaged on imaging surface.

Table 1 below lists the characteristics for the lens for including in optical imaging system, and table 2 lists the aspheric of lens Face amount.In table 1, " * " indicates that corresponding surface is non-spherical surface.

Table 1:

Table 2:

Second example

Fig. 3 is the second example of optical imaging system.The aberration that Fig. 4 shows optical imaging system shown in Fig. 3 is bent The example of line.

Optical imaging system 200 as shown in Figure 3 may include the first lens 210, the second lens 220, the third lens 230 With the 4th lens 240.

First lens 210 can have positive refractive power, and can have protrusion object side surface and recessed image interface.The Two lens 220 can have positive refractive power, and can have the object side surface of protrusion and the image interface of protrusion.The third lens 230 There can be positive refractive power, and there can be the image interface of recessed object side surface and protrusion.4th lens 240 can have negative bend Luminous power, and can have the image interface of recessed object side surface and protrusion.4th lens 240 can also have in object side surface and The shape of inflection point is formed in image interface.

Optical imaging system 200 may also include diaphragm ST, optical filter 250 and imaging sensor 260.Diaphragm ST may be provided at First lens 210 are in the front area of object space, and the adjustable light for being incident on imaging sensor 260.Optical filter 250 can be set It sets between the 4th lens 240 and imaging sensor 260, and infrared light can be stopped.Imaging sensor 260 can form imaging Face, subject can be imaged on imaging surface.The half (IMG HT) of the catercorner length of imaging surface can be relatively shorter than the 4th lens Effective radius.

Table 3 below illustrates the characteristics of lens included in optical imaging system, and table 4 lists the non-of lens Spherical surface value.In table 3, " * " indicates that corresponding surface is non-spherical surface.

Table 3:

Table 4:

Surface number	S3	S7	S9
				K	0	0	0
A	0	-4.30632	0
				B	-0.03222	-0.59889	0.15706
C	0.25944	1.69726	-0.28234
				D	-0.52617	-2.62138	0.10552
E	0.5257	2.02605	0.00386
				F	-0.19907	-0.60194	-0.00708
G	0	0	0
				H	0	0	0

Third example

Fig. 5 is the third example of optical imaging system.The aberration that Fig. 6 shows optical imaging system shown in Fig. 5 is bent The example of line.

Optical imaging system 300 as shown in Figure 5 may include the first lens 310, the second lens 320, the third lens 330 With the 4th lens 340.

First lens 310 can have positive refractive power, and can have protrusion object side surface and recessed image interface.The Two lens 320 can have positive refractive power, and can have the image interface of recessed object side surface and protrusion.The third lens 330 There can be positive refractive power, and there can be the image interface of recessed object side surface and protrusion.4th lens 340 can have negative bend Luminous power, and can have protrusion object side surface and recessed image interface.4th lens 340 can have in object side surface and picture The shape of inflection point is formed in square surface.

Optical imaging system 300 may also include diaphragm ST, optical filter 350 and imaging sensor 360.Diaphragm ST may be provided at First lens 310 are on the front area of object space, and the adjustable light for being incident on imaging sensor 360.Optical filter 350 can be set It sets between the 4th lens 340 and imaging sensor 360, and infrared light can be stopped.Imaging sensor 360 can form imaging Face, subject can be imaged on imaging surface.The half of the catercorner length of imaging surface can be relatively shorter than effectively the half of the 4th lens Diameter.

Following table 5 lists the characteristic of lens included in optical imaging system, and table 6 lists the non-of lens Spherical surface value.In table 5, " * " indicates that corresponding surface is non-spherical surface.

Table 5:

Table 6:

Table 7 lists the value of the conditional expression of optical imaging system of first example into third example

Table 7:

Optical imaging system can have optical characteristics as described below.For example, the total focal length of optical imaging system can be about In the range of 1.5mm to about 2.5mm, the total length (TTL) on optical axis from the object side surface of the first lens to imaging surface can In the range of about 2.5mm to about 4.0mm, full filed angle (FOV) can in the range of about 30 ° to about 40 °, imaging surface it is diagonal Line length can be in the range of about 2.5mm to about 4.0mm, and Entry pupil diameters (EPD) can be in about 1.2mm to the model of about 2.5mm In enclosing.The sum of focal length of the focal length of first lens and the second lens can in the range of about 10mm to about 15mm, the third lens Focal length can be in the range of about 1.0mm to about 2.0mm and the focal length of the 4th lens can be in about -4.0mm to the model of about -1.0mm In enclosing.

According to aforementioned exemplary, realize with small size and under low light conditions to the optical imagery of subject imaging System.

Although the present disclosure includes specific examples, be evident that for those of ordinary skills, not In the case where the spirit and scope for being detached from claim and its equivalent, in form and details various can be made to these examples Change.Example as described herein is considered merely as descriptive sense, rather than for purposes of limitation.In each example The description of features or aspect will be understood as being applicable to the similar features or aspect in other examples.If according to different Sequence executes the technology of description, and/or if combines and/or pass through other assemblies or their equivalent in different forms The component in system, framework, device or the circuit of description is replaced or increased, then can get suitable result.Therefore, the disclosure Range is limited not by specific embodiment but is limited by claim and its equivalent, in claim and its is equal Whole modifications within the scope of object will be understood to comprise in the disclosure.

Claims

1. a kind of optical imaging system, which is characterized in that the optical imaging system includes:

First lens, the second lens, the third lens and the 4th lens, sequence is arranged from the object side to the image side,

Wherein, the optical imaging system meets conditional expression below:

No.≤1.5 F,

0.5 < EPD/TTL < 0.7,

Wherein, EPD is Entry pupil diameters, and TTL be from the object side surfaces of first lens to imaging surface on optical axis Distance, F No. are the F number of the optical imaging system.

2. optical imaging system according to claim 1, which is characterized in that first lens have positive refractive power.

3. optical imaging system according to claim 1, which is characterized in that second lens have positive refractive power.

4. optical imaging system according to claim 1, which is characterized in that the third lens have positive refractive power.

5. optical imaging system according to claim 1, which is characterized in that the 4th lens have negative refractive power.

6. optical imaging system according to claim 1, which is characterized in that first lens have recessed image space table Face.

7. optical imaging system according to claim 1, which is characterized in that second lens have the image space table of protrusion Face.

8. optical imaging system according to claim 1, which is characterized in that the 4th lens have recessed object space table Face.

9. optical imaging system according to claim 1, which is characterized in that pair of the imaging surface of the optical imaging system The half of diagonal length is less than the effective radius of the 4th lens.

10. a kind of optical imaging system, which is characterized in that the optical imaging system includes:

Multiple lens, sequence is arranged from the object side to the image side,

Wherein, the optical imaging system meets conditional expression below:

No.≤1.5 F,

4.0 < (f1+f2)/f < 8.0,

Wherein, f is the total focal length of the optical imaging system, and f1 is closest to the focal length of the first lens of object space setting, and F2 is the focal length for the second lens being disposed adjacent with first lens, and F No. is the F number of the optical imaging system.

11. optical imaging system according to claim 10, which is characterized in that the multiple lens include four lens.

12. optical imaging system according to claim 10, which is characterized in that first lens and second lens With positive refractive power.

13. optical imaging system according to claim 10, which is characterized in that the optical imaging system meets below Conditional expression:

1.0 < TTL/f < 2.0,

Wherein, TTL is from the object side surface of first lens to the distance on optical axis of imaging surface.

14. optical imaging system according to claim 10, which is characterized in that the optical imaging system meets below Conditional expression:

0.3 < R1/TTL < 5.0,

Wherein, R1 is the radius of curvature of the object side surface of first lens, and TTL is the object space table from first lens Distance on optical axis of the face to imaging surface.

15. optical imaging system according to claim 10, which is characterized in that the optical imaging system meets condition table Up to formula:

0.5 < f3/f < 0.8,

Wherein, f3 is the focal length for the third lens being disposed adjacent with second lens.

16. optical imaging system according to claim 10, which is characterized in that the optical imaging system meets condition table Up to formula:

- 2.0 < f4/f < -0.5,

Wherein, f4 is the focal length for the 4th lens being disposed adjacent with the third lens, wherein the third lens are saturating with described second Mirror is disposed adjacent.

17. optical imaging system according to claim 10, which is characterized in that the optical imaging system meets condition table Up to formula:

- 0.5 < R1/R3 < 1.0,

Wherein, R1 is the radius of curvature of the object side surface of first lens, and R3 is the object side surface of second lens Radius of curvature.

18. optical imaging system according to claim 10, which is characterized in that the optical imaging system also meets condition No. < 1.5 0.8 < F of expression formula.

19. optical imaging system according to claim 10, which is characterized in that from the object side surfaces of first lens to The imaging surface of the optical imaging system in the distance on optical axis in the range of 2.5mm to 4.0mm.