CN206773277U - Micro pick-up lens - Google Patents
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Abstract
The utility model discloses a kind of micro pick-up lens, include successively from thing side to image side along optical axis：Have the first lens of positive light coke, its thing side surface is convex surface；Have the second lens of negative power, its thing side surface is convex surface, and image side surface is concave surface；Have the 3rd lens of positive light coke, its thing side surface is convex surface, and image side surface is concave surface；Have the 4th lens of positive light coke, its thing side surface is concave surface, and image side surface is convex surface, and is provided with least one point of inflexion on the image side surface of the 4th lens；Have the 5th lens of negative power, its image side surface is concave surface, and is provided with least one point of inflexion on the image side surface of the 5th lens；Cutoff filter；Wherein, described first, second, third and fourth, five lens are plastic cement aspherical lens.The micro pick-up lens not only effectively improve image quality, and have the characteristics of miniaturization, image quality are high and the angle of visual field is big.
Description
Technical Field
The utility model relates to a camera lens technical field especially relates to a miniature camera lens.
Background
In recent years, with the development of science and technology, portable electronic products having an image pickup function have been gradually developed, and the demand for a miniaturized image pickup lens in the market has been gradually increased. As the size of pixels of photosensitive elements is reduced with the advancement of semiconductor processing technology, the optical systems tend to have higher pixels. The pixel size of the chip is smaller and smaller, and the imaging quality requirement of the optical system matched with the chip is higher and higher.
In various miniaturized five-lens optical lens group designs, different positive or negative power combinations are mostly adopted, for example, the fourth lens and the fifth lens with different refractive powers are adopted in the patent application number CN201110183987 to form different optical systems, but the optical total length and the pixel quality of the optical system are difficult to meet the use requirements of modern small portable electronic devices, and the field angle is also not favorable for wide-angle occasions.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the present invention is to provide a compact micro camera lens with high imaging quality and a large field angle.
According to the utility model discloses miniature camera lens of embodiment includes along the optical axis from the thing side to picture side in proper order:
a diaphragm;
a first lens with positive focal power, wherein the object side surface of the first lens is a convex surface;
a second lens with negative focal power, wherein 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;
a third lens with positive focal power, wherein 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 fourth lens with positive focal power has a concave object-side surface and a convex image-side surface, and at least one inflection point is arranged on the image-side surface of the fourth lens;
the image side surface of the fifth lens is a concave surface, and at least one inflection point is arranged on the image side surface of the fifth lens;
an infrared cut filter;
the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all plastic aspheric lenses;
wherein,represents the optical power of the first lens,represents the optical power of the second lens,represents the optical power of the third lens,represents the optical power of the fourth lens,represents the combined optical power of the first lens and the second lens,represents the combined power of the fourth lens and the fifth lens,the focal power of the whole miniature camera lens is expressed, and the focal power satisfies the following conditional expression:
the condition (1) is the power distribution between the first lens and the second lens, and contributes to correction of chromatic aberration and aberration. The power distribution of the condition (2) contributes to achieving a wide angle. The power distribution of the condition (3) contributes to correction of system aberration and sensitivity. The power distribution of the condition (4) is advantageous for shortening the lens size, thereby achieving miniaturization.
Further, the miniature camera lens satisfies the conditional expression:
TL/ImgH<1.5， (5)
wherein, TLThe optical total length of the micro camera lens is shown, and ImgH represents the half-image height on an imaging surface. Limit of Condition (5)The total length of the lens system is controlled, and the system has enough good imaging quality, when the condition T is metLWhen the value of/ImgH exceeds the upper limit, the total length of the whole lens system is large, and the purposes of system miniaturization and compactness cannot be achieved.
Further, the miniature camera lens satisfies the conditional expression:
1<(R9+R10)/(R9-R10)<1.3， (6)
wherein R is9Denotes a radius of curvature, R, of the object-side surface of the fifth lens10A radius of curvature of the image-side surface of the fifth lens. Satisfying the condition (6) can effectively shorten the optical total length of the lens and promote miniaturization of the lens.
Further, the miniature camera lens satisfies the conditional expression:
0.5<(R7-R8)/(R7+R8)<0.7， (7)
wherein R is7Represents a radius of curvature, R, of the object-side surface of the fourth lens element8Represents a radius of curvature of the image-side surface of the fourth lens. Condition (7) defines the shape of the fourth lens when (R)7-R8)/(R7+R8) When the value of (2) exceeds the upper limit, the field curvature and distortion excessively increase towards the positive direction, and the correction is difficult; on the contrary, when (R)7-R8)/(R7+R8) When the value of (d) exceeds the lower limit, the field curvature and distortion excessively increase in the negative direction, making correction difficult.
Further, the miniature camera lens satisfies the conditional expression:
0.4<T23/T34<0.7， (8)
wherein, T23Represents a distance, T, between the second lens and the third lens on the optical axis34Represents a distance between the third lens and the fourth lens on the optical axis. Satisfying the condition (8) facilitates the assembly of the lens.
Further, the miniature camera lens satisfies the conditional expression:
28<V1-V2<45， (9)
wherein, V1、V2The abbe numbers of the materials of the first lens and the second lens are respectively shown. Condition (9) is an achromatic condition, when V is1-V2When the value of (A) exceeds the lower limit, the chromatic aberration is large and the correction is difficult; when V is1-V2When the value of (A) exceeds the upper limit, the material selection is not used.
Further, the aspherical surface shapes of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens all satisfy the equation:
wherein z is the distance rise from the aspheric surface vertex when the aspheric surface is at the position with the height h along the optical axis direction, c is the paraxial curvature radius of the surface, k is the conic coefficient, A2iIs the aspheric surface type coefficient of 2i order.
Further, the total optical length T of the miniature camera lensLThe conditional expression is satisfied:
TL≤3.41mm。
further, the field angle FOV of the miniature camera lens satisfies the conditional expression:
FOV≥83°。
compared with the prior art, the miniature camera lens at least has the following advantages:
(1) the miniature camera lens adopts five plastic aspheric lenses, so that the weight and the volume of the camera lens can be effectively reduced, and better optical imaging quality can be provided;
(2) the miniature camera lens is short in total length, small in size, convenient to assemble, capable of effectively reducing tolerance loss and capable of guaranteeing high-quality resolving power;
(3) the miniature camera lens has clear imaging and high sharpness, and reaches more than 800 ten thousand pixels;
(4) the field angle of the miniature camera lens can reach 83 degrees, ghost images can be effectively inhibited, distortion can be corrected, and the incident angle of the chief ray on an imaging surface is effectively controlled.
Advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a micro camera lens according to an embodiment of the present invention;
FIG. 2a is a field curvature graph of a proposed micro camera lens implemented according to the present invention;
FIG. 2b is a graph showing F-Theta distortion of a proposed micro camera lens according to the present invention;
FIG. 3 is a schematic diagram of an on-axis spherical aberration of a micro camera lens according to the present invention;
FIG. 4 is a schematic diagram of lateral chromatic aberration of a proposed micro camera lens according to the present invention;
FIG. 5a is a field curvature graph of a micro camera lens according to the second embodiment of the present invention;
FIG. 5b is a graph of F-Theta distortion for a miniature camera lens according to the second embodiment of the present invention;
FIG. 6 is a schematic diagram of an on-axis spherical aberration of a micro camera lens according to the second embodiment of the present invention;
FIG. 7 is a schematic diagram of lateral chromatic aberration of a micro camera lens according to the second embodiment of the present invention;
FIG. 8a is a field curvature graph of a miniature camera lens according to the present invention;
FIG. 8b is a graph of F-Theta distortion for a proposed micro camera lens according to the present invention;
FIG. 9 is a schematic diagram of on-axis spherical aberration of a micro camera lens according to the third embodiment of the present invention;
FIG. 10 is a schematic diagram of lateral chromatic aberration of a micro camera lens according to the third embodiment of the present invention;
r in FIG. 11Denotes a radius of curvature, R, of the object-side surface of the first lens 112Denotes a radius of curvature, R, of the image-side surface of the first lens 113Denotes a radius of curvature, R, of the object-side surface of the second lens 124Denotes a radius of curvature, R, of the image-side surface of the second lens 125Denotes a radius of curvature, R, of the object side surface of the third lens 136Denotes a radius of curvature, R, of the image-side surface of the third lens 137Denotes a radius of curvature, R, of the object side surface of the fourth lens 148Denotes a radius of curvature, R, of the image-side surface of the fourth lens element 149Denotes a radius of curvature, R, of the object-side surface of the fifth lens 1510A radius of curvature of the image side surface of the fifth lens 15 is shown.
Detailed Description
In order to make the objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. Several embodiments of the invention are given in the accompanying drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," "up," "down," and the like are for illustrative purposes only and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, a micro camera lens 10 according to an embodiment of the present invention sequentially includes, from an object side to an image side along an optical axis:
an aperture 101;
a first lens element 11 with positive refractive power having a convex object-side surface;
a second lens element 12 with negative refractive power having a convex object-side surface and a concave image-side surface;
a third lens element 13 with positive refractive power having a convex object-side surface and a concave image-side surface;
a fourth lens element 14 with positive refractive power having a concave object-side surface and a convex image-side surface, wherein at least one inflection point is disposed on the image-side surface of the fourth lens element 14;
the image side surface of the fifth lens 15 is a concave surface, and at least one inflection point is arranged on the image side surface of the fifth lens 15;
an infrared cut filter 102;
the first lens 11, the second lens 12, the third lens 13, the fourth lens 14 and the fifth lens 15 are all plastic aspheric lenses.
In addition, 103 in fig. 1 is an imaging plane.
Wherein,represents the optical power of the first lens 11,represents the optical power of the second lens 12,represents the optical power of the third lens 13,represents the optical power of the fourth lens 14,represents the combined power of the first lens 11 and the second lens 12,represents the combined power of the fourth lens 14 and the fifth lens 15,the refractive power of the entire micro imaging lens 10 is expressed, and satisfies the following conditional expression:
the condition (1) is the power distribution between the first lens 11 and the second lens 12, and contributes to correction of chromatic aberration and aberration. The power distribution of the condition (2) contributes to achieving a wide angle. The power distribution of the condition (3) contributes to correction of system aberration and sensitivity. The power distribution of the condition (4) is advantageous for shortening the lens size, thereby achieving miniaturization.
Further, the micro imaging lens 10 satisfies the conditional expression:
TL/ImgH<1.5， (5)
wherein, TLThe optical total length of the micro imaging lens 10 is shown, and ImgH represents the half-image height on the imaging plane. The condition (5) limits the total length of the lens system and ensures that the system has sufficiently good imaging quality when the condition TLWhen the value of/ImgH exceeds the upper limit, the total length of the whole lens system is large, and the purposes of system miniaturization and compactness cannot be achieved.
Further, the micro imaging lens 10 satisfies the conditional expression:
1<(R9+R10)/(R9-R10)<1.3， (6)
wherein R is9Denotes a radius of curvature, R, of an object-side surface of the fifth lens 1510A radius of curvature of the image side surface of the fifth lens 15. Satisfying the condition (6) can effectively shorten the optical total length of the lens and promote miniaturization of the lens.
Further, the micro imaging lens 10 satisfies the conditional expression:
0.5<(R7-R8)/(R7+R8)<0.7， (7)
wherein R is7Denotes a radius of curvature, R, of an object side surface of the fourth lens element 148Represents a radius of curvature of the image-side surface of the fourth lens element 14. Condition (7) defines the shape of the fourth lens 14 when (R)7-R8)/(R7+R8) When the value of (2) exceeds the upper limit, the field curvature and distortion excessively increase towards the positive direction, and the correction is difficult; on the contrary, when (R)7-R8)/(R7+R8) When the value of (d) exceeds the lower limit, the field curvature and distortion excessively increase in the negative direction, making correction difficult.
Further, the micro imaging lens 10 satisfies the conditional expression:
0.4<T23/T34<0.7， (8)
wherein, T23Represents a distance, T, between the second lens 12 and the third lens 13 on the optical axis34Indicating the distance between the third lens 13 and the fourth lens 14 on the optical axis. Satisfying the condition (8) facilitates the assembly of the lens.
Further, the micro imaging lens 10 satisfies the conditional expression:
28<V1-V2<45， (9)
wherein, V1、V2The abbe numbers of the materials of the first lens 11 and the second lens 12 are shown, respectively. Condition (9) is an achromatic condition, when V is1-V2When the value of (A) exceeds the lower limit, the chromatic aberration is large and the correction is difficult; when V is1-V2When the value of (A) exceeds the upper limit, the material selection is not used.
Further, the aspherical surface shapes of the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, and the fifth lens 15 all satisfy the equation:
wherein z is the distance rise from the aspheric surface vertex when the aspheric surface is at the position with the height h along the optical axis direction, c is the paraxial curvature radius of the surface, k is the conic coefficient, A2iIs the aspheric surface type coefficient of 2i order.
Further, the overall optical length T of the miniature camera lens 10LThe conditional expression is satisfied:
TL≤3.41mm。
further, the field angle FOV of the micro imaging lens 10 satisfies the conditional expression:
FOV≥83°。
compared with the prior art, the micro camera lens 10 has at least the following advantages:
(1) the miniature camera lens adopts five plastic aspheric lenses, so that the weight and the volume of the camera lens can be effectively reduced, and better optical imaging quality can be provided;
(2) the miniature camera lens is short in total length, small in size, convenient to assemble, capable of effectively reducing tolerance loss and capable of guaranteeing high-quality resolving power;
(3) the miniature camera lens has clear imaging and high sharpness, and reaches more than 800 ten thousand pixels;
(4) the field angle of the miniature camera lens can reach 83 degrees, ghost images can be effectively inhibited, distortion can be corrected, and the incident angle of the chief ray on an imaging surface is effectively controlled.
The invention is further illustrated below in the following examples. In each of the following embodiments, the thickness, the radius of curvature, and the concave-convex shape portion of each lens in the micro imaging lens are different, and specific differences can be referred to the parameter tables in the embodiments. The following examples are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following examples, and any other changes, substitutions, combinations or simplifications which do not depart from the innovative points of the present invention should be construed as being equivalent substitutions and shall be included within the scope of the present invention.
The first embodiment is as follows:
the parameters related to each lens in the miniature camera lens of the present embodiment are shown in table 1.
TABLE 1
The aspherical surface parameters of each lens in the micro imaging lens of this embodiment are shown in table 2.
TABLE 2
In the present embodiment, the field curvature, distortion, on-axis spherical aberration and lateral chromatic aberration of the miniature camera lens are respectively shown in fig. 2a, fig. 2b, fig. 3 and fig. 4.
Example two:
the parameters related to each lens in the miniature imaging lens of the present embodiment are shown in table 3.
TABLE 3
| Surface number | Structure of the product | Radius of curvature R | Thickness d | Refractive index nd | Abbe number vd |
| 0 | Article (A) | — | — | ||
| 1 | — | 0.26 | |||
| 2 | Diaphragm | — | -0.0944 | ||
| 3 | Lens 1 | 1.4550 | 0.3839 | 1.544 | 55.951 |
| 4 | -7.4620 | 0.0521 | |||
| 5 | Lens 2 | 5.8922 | 0.1890 | 1.651 | 21.513 |
| 6 | 1.5372 | 0.1576 | |||
| 7 | Lens 3 | 2.7268 | 0.3148 | 1.544 | 55.951 |
| 8 | 6.7130 | 0.2713 | |||
| 9 | Lens 4 | -2.8220 | 0.4651 | 1.544 | 55.951 |
| 10 | -0.6444 | 0.1730 | |||
| 11 | Lens 5 | 46.7031 | 0.2948 | 1.544 | 55.951 |
| 12 | 0.7200 | 0.4000 | |||
| 13 | Sheet glass | — | 0.2100 | 1.523 | 54.513 |
| 14 | — | 0.3275 | |||
| 15 | Image plane | — | — |
Aspherical surface parameters of each lens in the micro imaging lens according to the present embodiment are shown in table 4.
TABLE 4
In the present embodiment, curvature of field, distortion, on-axis spherical aberration and lateral chromatic aberration of the miniature camera lens are respectively shown in fig. 5a, 5b, 6 and 7.
Example three:
the parameters relating to each lens in the miniature imaging lens of the present embodiment are shown in table 5.
TABLE 5
Aspherical surface parameters of each lens in the micro imaging lens of this embodiment are shown in table 6.
TABLE 6
In the present embodiment, curvature of field, distortion, on-axis spherical aberration and lateral chromatic aberration of the miniature camera lens are respectively shown in fig. 8a, 8b, 9 and 10.
In addition, table 7 shows the 3 embodiments and the corresponding optical characteristics, including the focal length F, F # of the micro camera lens, and the total optical length T of the micro camera lensLAnd an angle of view 2 θ, and a numerical value corresponding to each of the foregoing conditional expressions.
TABLE 7
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (9)
1. A micro imaging lens, comprising, in order from an object side to an image side along an optical axis:
a diaphragm;
a first lens with positive focal power, wherein the object side surface of the first lens is a convex surface;
a second lens with negative focal power, wherein 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;
a third lens with positive focal power, wherein 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 fourth lens with positive focal power has a concave object-side surface and a convex image-side surface, and at least one inflection point is arranged on the image-side surface of the fourth lens;
the image side surface of the fifth lens is a concave surface, and at least one inflection point is arranged on the image side surface of the fifth lens;
an infrared cut filter;
the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all plastic aspheric lenses;
wherein,represents the optical power of the first lens,represents the optical power of the second lens,represents the optical power of the third lens,represents the optical power of the fourth lens,represents the combined optical power of the first lens and the second lens,represents the combined power of the fourth lens and the fifth lens,the focal power of the whole miniature camera lens is expressed, and the focal power satisfies the following conditional expression:
2. the miniature camera lens of claim 1, wherein said miniature camera lens satisfies the conditional expression:
TL/ImgH<1.5；
wherein, TLThe optical total length of the micro camera lens is shown, and ImgH represents the half-image height on an imaging surface.
3. The miniature camera lens of claim 2, wherein said miniature camera lens satisfies the conditional expression:
1<(R9+R10)/(R9-R10)<1.3；
wherein R is9Denotes a radius of curvature, R, of the object-side surface of the fifth lens10A radius of curvature of the image-side surface of the fifth lens.
4. The miniature camera lens of claim 2, wherein said miniature camera lens satisfies the conditional expression:
0.5<(R7-R8)/(R7+R8)<0.7；
wherein R is7Represents a radius of curvature, R, of the object-side surface of the fourth lens element8Represents a radius of curvature of the image-side surface of the fourth lens.
5. The miniature camera lens of claim 2, wherein said miniature camera lens satisfies the conditional expression:
0.4<T23/T34<0.7；
wherein, T23Represents a distance, T, between the second lens and the third lens on the optical axis34Represents a distance between the third lens and the fourth lens on the optical axis.
6. The miniature camera lens of claim 2, wherein said miniature camera lens satisfies the conditional expression:
28<V1-V2<45；
wherein, V1、V2The abbe numbers of the materials of the first lens and the second lens are respectively shown.
7. The micro imaging lens according to claim 1, wherein aspherical surface shapes of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens satisfy an equation:
wherein z is the distance rise from the aspheric surface vertex when the aspheric surface is at the position with the height h along the optical axis direction, c is the paraxial curvature radius of the surface, k is the conic coefficient, A2iIs the aspheric surface type coefficient of 2i order.
8. The miniature camera lens of any of claims 1 to 7, wherein said miniature camera lens has an optical overall length TLThe conditional expression is satisfied:
TL≤3.41mm。
9. the micro imaging lens according to any one of claims 1 to 7, wherein a field angle FOV of the micro imaging lens satisfies a conditional expression:
FOV≥83°。
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| CN201720548339.4U CN206773277U (en) | 2017-05-17 | 2017-05-17 | Micro pick-up lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720548339.4U CN206773277U (en) | 2017-05-17 | 2017-05-17 | Micro pick-up lens |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109960007A (en) * | 2017-12-22 | 2019-07-02 | 南昌欧菲光电技术有限公司 | Pick-up lens and electronic device |
| CN112731631A (en) * | 2021-04-06 | 2021-04-30 | 江西联益光学有限公司 | Optical lens and imaging apparatus |
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2017
- 2017-05-17 CN CN201720548339.4U patent/CN206773277U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109960007A (en) * | 2017-12-22 | 2019-07-02 | 南昌欧菲光电技术有限公司 | Pick-up lens and electronic device |
| CN112731631A (en) * | 2021-04-06 | 2021-04-30 | 江西联益光学有限公司 | Optical lens and imaging apparatus |
| CN112731631B (en) * | 2021-04-06 | 2021-08-20 | 江西联坤智能科技有限公司 | Optical lens and imaging apparatus |
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