CN215494322U - Optical imaging lens and camera device - Google Patents

Abstract

The utility model discloses an optical imaging lens and a camera device, which comprise a first lens and a second lens which are arranged in sequence from an object side to an image side along an optical axis, wherein all surfaces from an object side surface of the first lens to an image side surface of the second lens are aspheric surfaces; the first lens element with positive refractive power has a convex object-side surface and a concave image-side surface; the second lens element with positive refractive power has a concave object-side surface and a convex image-side surface; the first lens and the second lens have a refractive index of less than 1.5, and the optical imaging lens satisfies the following relation: 4 < f1/ENPD < 7; where f1 is the focal length of the first lens, and ENPD is the entrance pupil diameter of the optical imaging lens. The utility model provides an optical imaging lens and a camera device, which can reduce the number of lenses and ensure the imaging effect by matching the refractive power and the surface type of a first lens and a second lens, thereby meeting the requirements of the current consumer market on the lightness and thinness of the lens volume.

Description

Optical imaging lens and camera device

Technical Field

The utility model relates to the technical field of optical imaging, in particular to an optical imaging lens and a camera device.

Background

In order to ensure the imaging effect, the number of lenses included in the camera lens in the prior art is increasing, and the corresponding imaging characteristics are obtained by means of the accumulation of the number of lenses. However, nowadays, all kinds of electronic devices tend to be light and thin, and the combination of multiple lenses often means the increase of volume, which is not favorable for the demand of light and thin in the consumer market. In particular, some precision instruments have a high demand for downsizing a lens, and a lens having a plurality of lenses is difficult to be used in such precision instruments.

Therefore, how to ensure the imaging effect while reducing the number of lenses is a technical problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model provides an optical imaging lens and an image pickup device, aiming at overcoming the defects of the prior art, and solving the problem that the imaging effect is difficult to ensure while the number of lenses is reduced in the prior art.

In order to achieve the above purpose, the present invention provides the following technical solutions:

an optical imaging lens comprises a first lens and a second lens which are sequentially arranged from an object side to an image side along an optical axis, wherein the surfaces of the object side surface of the first lens to the image side surface of the second lens are aspheric surfaces;

the first lens element with positive refractive power has a convex object-side surface and a concave image-side surface; the second lens element with positive refractive power has a concave object-side surface and a convex image-side surface;

the first lens and the second lens have a refractive index of less than 1.5, and the optical imaging lens satisfies the following relation:

4＜f1/ENPD＜7；

where f1 is the focal length of the first lens, and ENPD is the entrance pupil diameter of the optical imaging lens.

Optionally, the optical imaging lens satisfies the following relation:

0＜f1/f2＜0.35；

where f2 is the focal length of the second lens.

Optionally, the optical imaging lens satisfies the following relation:

16＜TTL×Fno＜19；

wherein, TTL is the optical total length of the optical imaging lens, and Fno is the aperture value.

Optionally, the optical imaging lens satisfies the following relation:

0＜f1/f＜1.5；

wherein f is the focal length of the optical imaging lens.

Optionally, the optical imaging lens satisfies the following relation:

3＜f2/f＜4；

where f is the focal length of the optical imaging lens, and f2 is the focal length of the second lens.

Optionally, the optical imaging lens satisfies the following relation:

0.5＜(R11+R12)/f1＜1；

wherein R11 is a radius of curvature of the object-side surface of the first lens element, and R12 is a radius of curvature of the image-side surface of the first lens element.

Optionally, the optical imaging lens satisfies the following relation:

-1＜(R21+R22)/f2＜0；

wherein R21 is a radius of curvature of the object-side surface of the second lens element, and R22 is a radius of curvature of the image-side surface of the second lens element.

Optionally, the optical imaging lens satisfies the following relation:

|f2/R21|＜20；

wherein R11 is a radius of curvature of the object-side surface of the first lens.

Optionally, the optical imaging lens further includes a diaphragm disposed between the first lens and the second lens.

The utility model also provides an image pickup device comprising the optical imaging lens.

Compared with the prior art, the utility model has the following beneficial effects:

the utility model provides an optical imaging lens and a camera device, which can reduce the number of lenses and ensure the imaging effect by matching the refractive power and the surface type of a first lens and a second lens, thereby meeting the requirements of the current consumer market on lightness and thinness.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic diagram of an optical imaging lens according to a first embodiment of the present invention;

fig. 2 is a graph illustrating astigmatism and distortion curves of an optical imaging lens according to an embodiment of the utility model;

fig. 3 is a spherical aberration curve chart of an optical imaging lens according to a first embodiment of the utility model;

fig. 4 is a schematic diagram of an optical imaging lens according to a second embodiment of the present invention;

fig. 5 is a graph illustrating astigmatism and distortion curves of an optical imaging lens according to a second embodiment of the utility model in order from left to right;

fig. 6 is a spherical aberration curve chart of an optical imaging lens according to a second embodiment of the present invention;

fig. 7 is a schematic view of an optical imaging lens according to a third embodiment of the present invention;

fig. 8 is a graph illustrating astigmatism and distortion curves of an optical imaging lens according to a third embodiment of the utility model in order from left to right;

fig. 9 is a spherical aberration curve chart of an optical imaging lens according to a third embodiment of the present invention.

In the above figures:

a first lens: 110. 210, 310; an object side surface: 111. 211, 311; image side: 112. 212, 312;

a second lens: 120. 220, 320; an object side surface: 121. 221, 321; image side: 122. 222, 322;

an infrared filter: 130. 230, 330;

imaging surface: 140. 240, 340;

diaphragm: 101. 201, 301;

f: the focal length of the optical imaging lens;

TTL: the optical total length of the optical imaging lens;

ENPD is the diameter of the entrance pupil of the optical imaging lens;

fno is the aperture value;

f 1: a focal length of the first lens;

f 2: a focal length of the second lens;

r11: a radius of curvature of the first lens object-side surface;

r12: a radius of curvature of an image-side surface of the first lens;

r21: a radius of curvature of the object-side surface of the second lens;

r22: a radius of curvature of the image-side surface of the second lens.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. 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.

The utility model provides the following technical scheme:

an optical imaging lens comprises a first lens and a second lens which are sequentially arranged from an object side to an image side along an optical axis, wherein all surfaces from an object side surface of the first lens to the image side surface of the second lens are aspheric.

The first lens element with positive refractive power has a convex object-side surface and a concave image-side surface; the second lens element with positive refractive power has a concave object-side surface and a convex image-side surface; the first lens and the second lens have a refractive index of less than 1.5. The optical imaging lens further comprises a diaphragm which is arranged between the first lens and the second lens and is beneficial to reducing the aperture of the front end, so that the effect of reducing the volume of the optical imaging lens is achieved.

Further, the optical imaging lens satisfies the following relation: 4 < f1/ENPD < 7; where f1 is the focal length of the first lens, and ENPD is the entrance pupil diameter of the optical imaging lens. Through restricting the focal length of the first lens and the entrance pupil diameter of the optical imaging lens, the optical imaging lens can obtain more excellent telephoto effect under the same image height, and simultaneously can control distortion, so that the optical imaging lens has excellent resolution performance.

Further, the optical imaging lens satisfies the following relation: f1/f2 is more than 0 and less than 0.35; where f2 is the focal length of the second lens. By reasonably controlling the ratio of f1 to f2, the amount of spherical aberration contribution of the first lens and the second lens is controlled within a reasonable range, and the imaging quality of the optical imaging lens in an on-axis field area is improved.

Further, the optical imaging lens satisfies the following relation: 16 < TTL × Fno < 19; wherein, TTL is the optical total length of the optical imaging lens, and Fno is the aperture value. Based on the relation, the length of the optical imaging lens is not increased while the optical aperture is increased, and the light and thin lens is facilitated to be achieved.

Further, the optical imaging lens satisfies the following relation: f1/f is more than 0 and less than 1.5; f2/f is more than 3 and less than 4; where f is the focal length of the optical imaging lens, and f2 is the focal length of the second lens. Therefore, the positive spherical aberration generated by the first lens and the second lens is balanced, and the optical imaging lens has good imaging quality.

Further, the optical imaging lens satisfies the following relation: 0.5 < (R11+ R12)/f1 < 1; -1 < (R21+ R22)/f2 < 0; wherein R11 is a radius of curvature of the object-side surface of the first lens element, R12 is a radius of curvature of the image-side surface of the first lens element, R21 is a radius of curvature of the object-side surface of the second lens element, and R22 is a radius of curvature of the image-side surface of the second lens element. Therefore, the field curvature of each field is balanced in a reasonable range, and the optical imaging lens has good imaging quality.

Further, the optical imaging lens satisfies the following relation: i f 2/R21I < 20; wherein R11 is a radius of curvature of the object-side surface of the first lens. By reasonably adjusting the ratio of the focal length of the second lens to the object-side surface of the second lens, the optical imaging lens has a good effect of correcting the aberration.

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 application will be described in detail below with reference to the embodiments with reference to the attached drawings.

Example one

Referring to fig. 1 to 3, fig. 1 is a schematic diagram illustrating an optical imaging lens according to a first embodiment of the utility model, fig. 2 is graphs of astigmatism and distortion of the optical imaging lens according to the first embodiment of the utility model in order from left to right, and fig. 3 is a graph of spherical aberration of the optical imaging lens according to the first embodiment of the utility model.

An optical imaging lens comprises a first lens 110 and a second lens 120 which are arranged in sequence from an object side to an image side along an optical axis, wherein each surface of an object side surface 111 of the first lens 110 to an image side surface 122 of the second lens 120 is an aspheric surface.

The first lens element 110 with positive refractive power has a convex object-side surface 111 and a concave image-side surface 112; the second lens element 120 with positive refractive power has a concave object-side surface 121 and a convex image-side surface 122; the first lens 110 and the second lens 120 have a refractive index less than 1.5.

The optical imaging lens further includes a diaphragm 101 disposed between the first lens 110 and the second lens 120, which is beneficial to reducing the front aperture, so as to achieve the effect of reducing the volume of the optical imaging lens.

In addition, the optical imaging lens further includes an infrared filter 130, the infrared filter 130 is disposed between the second lens 120 and the imaging plane 140, and infrared band light entering the lens is filtered by the infrared filter 130, so as to prevent infrared light from irradiating the photosensitive chip to generate noise. Specifically, the infrared filter 130 may be made of glass to avoid affecting the focal length.

Please refer to the following tables 1-1, 1-2 and 1-3.

Table 1-1 shows detailed structural data of an embodiment, where the unit of the radius of curvature, the thickness and the focal length is mm, f is the focal length of the optical imaging lens, Fno is the aperture value, ENPD is the entrance pupil diameter of the optical imaging lens, and TTL is the total optical length of the optical imaging lens. And surfaces 0 to 9 represent surfaces from the object side to the image side in order, wherein surfaces 1-6 represent, in order, an aperture stop, an object surface 111 of the first lens 110, an image surface 112 of the first lens 110, a stop 101, an object surface 121 of the second lens 120, and an image surface 122 of the second lens 120.

Table 1-2 shows aspheric coefficient data in the first embodiment, where k represents cone coefficients in aspheric curve equations, and a4, a6, A8, a10, a12, a14, and a16 represent aspheric coefficients of orders 4, 6, 8, 10, 12, 14, and 16 of each surface.

Tables 1 to 3 show the conditions satisfied by the optical imaging lens according to the first embodiment.

In addition, the following tables in the embodiments correspond to the schematic diagrams and graphs of the embodiments, and the definitions of the data in the tables are the same as those in tables 1-1, tables 1-2 and tables 1-3 of the first embodiment, which will not be described herein again.

Example two

Referring to fig. 1 to 3, fig. 1 is a schematic diagram illustrating an optical imaging lens according to a first embodiment of the utility model, fig. 2 is graphs of astigmatism and distortion of the optical imaging lens according to the first embodiment of the utility model in order from left to right, and fig. 3 is a graph of spherical aberration of the optical imaging lens according to the first embodiment of the utility model.

An optical imaging lens comprises a first lens 210 and a second lens 220 which are arranged in sequence from an object side to an image side along an optical axis, wherein each surface of an object side surface 211 of the first lens 210 to an image side surface 222 of the second lens 220 is an aspheric surface.

The first lens element 210 with positive refractive power has a convex object-side surface 211 and a concave image-side surface 212; the second lens element 220 with positive refractive power has a concave object-side surface 221 and a convex image-side surface 222; the first lens 210 and the second lens 220 have refractive indices less than 1.5.

The optical imaging lens further includes a diaphragm 201 disposed between the first lens 210 and the second lens 220, which is beneficial to reducing the front end aperture, thereby achieving the effect of reducing the volume of the optical imaging lens.

In addition, the optical imaging lens further includes an infrared filter 230, the infrared filter 230 is disposed between the second lens 220 and the imaging plane 240, and the infrared filter 230 filters infrared band light entering the lens, so as to prevent infrared light from irradiating the photosensitive chip to generate noise. Specifically, the infrared filter 230 may be made of glass to avoid affecting the focal length.

Please refer to the following Table 2-1, Table 2-2 and Table 2-3.

EXAMPLE III

Referring to fig. 1 to 3, fig. 1 is a schematic diagram illustrating an optical imaging lens according to a first embodiment of the utility model, fig. 2 is graphs of astigmatism and distortion of the optical imaging lens according to the first embodiment of the utility model in order from left to right, and fig. 3 is a graph of spherical aberration of the optical imaging lens according to the first embodiment of the utility model.

An optical imaging lens comprises a first lens 310 and a second lens 320 which are arranged in sequence from an object side to an image side along an optical axis, wherein each surface of an object side surface 311 of the first lens 310 to an image side surface 322 of the second lens 320 is an aspheric surface.

The first lens element 310 with positive refractive power has a convex object-side surface 311 and a concave image-side surface 312; the second lens element 320 with positive refractive power has a concave object-side surface 321 and a convex image-side surface 322; the first lens 310 and the second lens 320 have a refractive index less than 1.5.

The optical imaging lens further includes a diaphragm 301 disposed between the first lens 310 and the second lens 320, which is beneficial to reducing the front aperture, so as to achieve the effect of reducing the volume of the optical imaging lens.

In addition, the optical imaging lens further includes an infrared filter 330, the infrared filter 330 is disposed between the second lens 320 and the imaging surface 340, and infrared band light entering the lens is filtered by the infrared filter 330, so as to prevent infrared light from irradiating the photosensitive chip to generate noise. Specifically, the infrared filter 330 may be made of glass to avoid affecting the focal length.

Please refer to the following Table 3-1, Table 3-2 and Table 3-3.

Example four

The embodiment of the utility model also provides a camera device which comprises the optical imaging lens. Through the refractive power and the surface type collocation of first lens and second lens, can ensure the imaging effect when reducing lens quantity to adapt to present consumer market to the demand that the camera lens volume is frivolous.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. An optical imaging lens is characterized by comprising a first lens and a second lens which are sequentially arranged from an object side to an image side along an optical axis, wherein the surfaces of the object side surface of the first lens to the image side surface of the second lens are aspheric surfaces;

the first lens element with positive refractive power has a convex object-side surface and a concave image-side surface; the second lens element with positive refractive power has a concave object-side surface and a convex image-side surface;

the first lens and the second lens have a refractive index of less than 1.5, and the optical imaging lens satisfies the following relation:

4＜f1/ENPD＜7；

where f1 is the focal length of the first lens, and ENPD is the entrance pupil diameter of the optical imaging lens.

2. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies the following relationship:

0＜f1/f2＜0.35；

where f2 is the focal length of the second lens.

3. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies the following relationship:

16＜TTL×Fno＜19；

wherein, TTL is the optical total length of the optical imaging lens, and Fno is the aperture value.

4. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies the following relationship:

0＜f1/f＜1.5；

wherein f is the focal length of the optical imaging lens.

5. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies the following relationship:

3＜f2/f＜4；

where f is the focal length of the optical imaging lens, and f2 is the focal length of the second lens.

6. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies the following relationship:

0.5＜(R11+R12)/f1＜1；

wherein R11 is a radius of curvature of the object-side surface of the first lens element, and R12 is a radius of curvature of the image-side surface of the first lens element.

7. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies the following relationship:

-1＜(R21+R22)/f2＜0；

wherein R21 is a radius of curvature of the object-side surface of the second lens element, and R22 is a radius of curvature of the image-side surface of the second lens element.

8. The optical imaging lens of claim 1, wherein the optical imaging lens satisfies the following relationship:

|f2/R21|＜20；

wherein R11 is a radius of curvature of the object-side surface of the first lens.

9. The optical imaging lens of claim 1, further comprising a stop disposed between the first lens and the second lens.

10. An image pickup apparatus comprising the optical imaging lens according to any one of claims 1 to 9.

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