CN216248540U - Optical imaging system - Google Patents
Optical imaging system Download PDFInfo
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- CN216248540U CN216248540U CN202123019217.1U CN202123019217U CN216248540U CN 216248540 U CN216248540 U CN 216248540U CN 202123019217 U CN202123019217 U CN 202123019217U CN 216248540 U CN216248540 U CN 216248540U
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Abstract
An optical imaging system includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, and an optical sensing element, wherein an image plane of the optical imaging system is located on a side of the optical sensing element facing the fourth lens element. The object side surface of the fourth lens is provided with a first effective diameter, the image side surface of the fourth lens is provided with a second effective diameter, the average value of the first effective diameter and the second effective diameter is an average effective diameter, the optical sensing element is provided with a diagonal length, and the ratio of the average effective diameter to the diagonal length is between 0.58 and 0.7.
Description
Technical Field
The present invention relates to an optical imaging system, and more particularly, to an optical imaging system capable of narrowing the width of a lens.
Background
It is to be noted that the current electronic products are gradually developed toward light and thin along with the technological evolution, and the screen occupation ratio thereof is gradually increased. Further, electronic products are designed in a direction of being light, thin, small, and the size of a lens mounted on the electronic products is easily limited, so that miniaturization of an optical system becomes a necessary means.
For example, the conventional optical imaging system with 2MB pixels has a length of 6mm and a width of 6mm, and the ratio of the average effective diameter of the fourth lens to the diagonal length of the optical sensing element is between 0.7 and 0.9, however, the conventional optical imaging system has too large width to meet the requirement of light and thin electronic products. Although lens manufacturers can directly narrow the width of the optical imaging system, the design reduces the size of the lens and simultaneously sacrifices the optical effective diameter of the lens and the size of the image sensor, which leads to the decrease of the optical performance of the optical imaging system. If the effective optical diameter of the lens is enlarged and the ineffective optical diameter of the lens is reduced in order to maintain the optical performance of the optical imaging system, the subsequent assembly of the optical imaging system on the lens base is difficult.
SUMMERY OF THE UTILITY MODEL
The main purpose of the present invention is to solve the problem that the conventional four-plate optical imaging system cannot be shortened in width and maintain good optical performance.
Another objective of the present invention is to solve the problem that the conventional four-piece optical imaging system increases the optical effective diameter of the lens to maintain the optical performance during the size reduction, which makes the subsequent assembly difficult.
In order to achieve the above object, the present invention provides an optical imaging system, which comprises, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and an optical sensing element, wherein the first lens element to the fourth lens element have refractive powers, and one side of the optical sensing element facing the fourth lens element is an image plane of the optical imaging system. The fourth lens element has an object-side surface and an image-side surface, the object-side surface of the fourth lens element has a first effective diameter, the image-side surface of the fourth lens element has a second effective diameter, an average of the first effective diameter and the second effective diameter is an average effective diameter, the optical sensing element has a diagonal length, and a ratio of the average effective diameter to the diagonal length is between 0.58 and 0.7.
In one embodiment, the fourth lens element has a first invalid length on the object-side surface, the fourth lens element has a second invalid length on the image-side surface, the first invalid length is a distance from an edge of an optically effective range of the fourth lens element on the object-side surface to an edge of the object-side surface of the fourth lens element, the second invalid length is a distance from an edge of the optically effective range of the fourth lens element on the image-side surface to an edge of the image-side surface of the fourth lens element, and the first invalid length and the second invalid length are 0.1mm, respectively.
In one embodiment, the optical imaging system has a maximum field angle between 75 degrees and 88 degrees.
In one embodiment, the optical imaging system comprises an aperture, which is implemented in one of the following embodiments i and ii:
the diaphragm is arranged on one side of the first lens, which does not face the second lens;
in embodiment ii, the aperture is disposed between any two adjacent lenses of the first lens and the fourth lens.
In one embodiment, the aperture has an aperture value of 2.0.
In one embodiment, the optical imaging system includes a filter element disposed between the fourth lens element and the imaging surface.
In one embodiment, at least one of the object-side surface and the image-side surface of the fourth lens element has at least one inflection point.
In one embodiment, at least one of the object-side surface and the image-side surface of the fourth lens element is aspheric.
In one embodiment, the object-side surface and the image-side surface of the fourth lens element are aspheric.
Through the implementation of the utility model, compared with the prior art, the utility model has the following characteristics: the utility model does not change the size of the optical sensing element, but reduces the ratio of the average effective diameter to the diagonal length, so that the optical imaging system can maintain the optical property while reducing the width.
Drawings
FIG. 1 is a schematic view of an optical imaging system according to a first embodiment of the present invention;
FIG. 2 is a schematic view of an optical imaging system according to a second embodiment of the present invention;
fig. 3 is a schematic view of an optical imaging system according to a third embodiment of the present invention.
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Detailed Description
The present invention is described in detail and technical content with reference to the accompanying drawings, wherein:
an optical imaging system includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and an optical sensing element. The first lens element, the second lens element, the third lens element and the fourth lens element respectively have refractive power, and the first lens element, the second lens element, the third lens element and the fourth lens element can be made of glass or plastic.
The fourth lens is provided with an object side surface facing the object side of the optical imaging system, an image side surface facing the image side of the optical imaging system, an area where the fourth lens does not generate noise light after receiving light is an optical effective range, the object side surface of the fourth lens has a first effective diameter based on the optical effective range, the image side surface of the fourth lens has a second effective diameter based on the optical effective range, and the average value of the first effective diameter and the second effective diameter is an average effective diameter.
The side of the optical sensing element facing the fourth lens element is an imaging surface of the optical imaging system, the size of the optical sensing element is calculated by a diagonal length, and the size of the optical sensing element can be designed according to requirements, for example, the size of the optical sensing element can be 1/5 inches, 1/6 inches, 1/7 inches, and the like.
In order to maintain the performance of the optical imaging system, the size of the optical sensing element is not reduced, but the fourth lens is narrowed, and the ratio of the average effective diameter to the diagonal length of the fourth lens is between 0.58 and 0.7 and is smaller than the ratio of the average effective diameter to the diagonal length (between 0.7 and 0.9) of the conventional fourth lens, thereby the width of the optical imaging system is reduced. For example, when the present invention is applied to a lens capable of providing 2MB pixels, the length and width of the conventional optical imaging system is 6mm × 6mm, and the length and width of the optical imaging system of the present invention is 6mm × 4mm, so that the present invention can actually reduce the size of the optical imaging system.
In addition, in one embodiment, the area of the fourth lens element that generates the noise light after receiving the light is an optically inactive area, and the position where the fourth lens element is expected to be assembled with a lens base is located in the optically inactive area. The object side surface of the fourth lens has a first ineffective length based on the optical ineffective range, the image side surface of the fourth lens has a second ineffective length based on the optical ineffective range, the first ineffective length is the distance from the edge of the optical effective range of the object side surface of the fourth lens to the edge of the object side surface of the fourth lens, the second ineffective length is the distance from the edge of the optical effective range of the image side surface of the fourth lens to the edge of the image side surface of the fourth lens, and the first ineffective length and the second ineffective length are respectively 0.1mm, so that the size of the fourth lens is narrowed, the position expected to be assembled with the lens base is still reserved, and the subsequent assembly operation is facilitated.
Further, at least one of the object-side surface and the image-side surface of the fourth lens element is aspheric. Preferably, the object-side surface and the image-side surface of the fourth lens element are aspheric. In another embodiment, at least one of the object-side surface and the image-side surface of the fourth lens element has at least one inflection point for effectively suppressing the incident angle of light. Preferably, the object-side surface and the image-side surface of the fourth lens element each have at least one inflection point.
In addition, in one embodiment, the optical imaging system has a maximum field of view (FOV) between 75 degrees and 88 degrees.
Furthermore, in an embodiment of the present invention, at least one aperture can be disposed as required in the optical imaging system, and the aperture can be configured to be located on a side of the first lens element facing the second lens element, i.e. a so-called front aperture, which can be used to increase the efficiency of the optical sensor for receiving images. In addition, the aperture stop may also be disposed between any two adjacent first to fourth lenses, thereby helping to enlarge the field angle of the optical imaging system. In this embodiment, the aperture has an aperture value, which may be 2.0.
In addition, in an embodiment, the optical imaging system has a filter element, the filter element is located between the fourth lens element and the imaging plane, and the material of the filter element may be glass or other materials.
The present invention is described in detail below with reference to the following embodiments and accompanying drawings.
Referring to fig. 1, in a first embodiment of the present invention, an optical imaging system 100 is provided, where the optical imaging system 100 includes, in order from an object side to an image side, an aperture stop, a first lens element 120, a second lens element 130, a third lens element 140, a fourth lens element 150, a filter element 160, and an optical sensor element 170.
The fourth lens element 150 of the first embodiment has an object-side surface 151 and an image-side surface 152, the object-side surface 151 of the fourth lens element 150 is aspheric and has at least one inflection point, and the image-side surface 152 is aspheric and has at least one inflection point.
Further, the effective radius of the object-side surface 151 is 0.485, and the effective radius of the image-side surface 152 is 0.612, i.e. a first effective diameter of the fourth lens element 150 is 0.97, a second effective diameter is 1.224, and an average effective diameter obtained by averaging the first effective diameter and the second effective diameter is 1.097.
The side of the optical sensing element 170 facing the fourth lens 150 is an imaging plane 180 of the optical imaging system 100, a diagonal length of the optical sensing element 170 is 1.638, and a ratio of the average effective diameter to the diagonal length is 0.669.
First, first embodiment lens data
In summary, the first embodiment of the present invention provides detailed structural data as shown in fig. 1, wherein the units of the radius of curvature, the thickness and the effective radius are mm, and the surfaces 1-12 sequentially represent an image plane defined by the aperture stop, an object-side surface 121 of the first lens element 120, an image-side surface 122 of the first lens element 120, an object-side surface 131 of the second lens element 130, an image-side surface 132 of the second lens element 130, an object-side surface 141 of the third lens element 140, an image-side surface 142 of the third lens element 140, the object-side surface 151 of the fourth lens element 150, the image-side surface 152 of the fourth lens element 150, the object-side surface of the filter element 160, the image-side surface of the filter element 160 and the image plane 180.
Referring to fig. 2, in a second embodiment of the present invention, an optical imaging system 200 is provided, wherein the optical imaging system 200 includes, in order from an object side to an image side, an aperture stop, a first lens element 220, a second lens element 230, a third lens element 240, a fourth lens element 250, a filter element 260, and an optical sensor element 270.
The fourth lens element 250 of the second embodiment has an object-side surface 251 and an image-side surface 252, the object-side surface 251 of the fourth lens element 250 is aspheric and has at least one inflection point, and the image-side surface 252 is also aspheric and has at least one inflection point.
Further, the effective radius of the object-side surface 251 is 0.572, and the effective radius of the image-side surface 252 is 0.762, that is, a first effective diameter of the fourth lens element 250 is 1.144, a second effective diameter is 1.524, and an average effective diameter obtained by averaging the first effective diameter and the second effective diameter is 1.332.
The side of the optical sensor 270 facing the fourth lens element 250 is an imaging plane 280 of the optical imaging system 200, a diagonal length of the optical sensor 270 is 2.056, and a ratio of the average effective diameter to the diagonal length is 0.648.
TABLE II second example lens data
In summary, the second embodiment of the present invention provides detailed structural data of the second embodiment of fig. 2, wherein the units of the radius of curvature, the thickness and the effective radius are mm, and the surfaces 1-12 sequentially represent an image plane defined by the aperture stop, an object-side surface 221 of the first lens element 220, an image-side surface 222 of the first lens element 220, an object-side surface 231 of the second lens element 230, an image-side surface 232 of the second lens element 230, an object-side surface 241 of the third lens element 240, an image-side surface 242 of the third lens element 240, the object-side surface 251 of the fourth lens element 250, the image-side surface 252 of the fourth lens element 250, the object-side surface of the filter element 260, the image-side surface of the filter element 260 and the image plane 280.
Referring to fig. 3, in a third embodiment of the present invention, an optical imaging system 300 is provided, the optical imaging system 300 includes, in order from an object side to an image side, a first lens element 320, an aperture stop 310, a second lens element 330, a third lens element 340, a fourth lens element 350, a filter element 360 and an optical sensing element 370.
The fourth lens element 350 in the third embodiment has an object-side surface 351 and an image-side surface 352, the object-side surface 351 of the fourth lens element 350 is aspheric and has at least one inflection point, and the image-side surface 352 is aspheric and has at least one inflection point.
Further, the effective radius of the object-side surface 351 is 0.527, and the effective radius of the image-side surface 352 is 0.678, i.e. a first effective diameter of the fourth lens element 350 is 1.054, a second effective diameter is 1.356, and an average effective diameter obtained by averaging the first effective diameter and the second effective diameter is 1.204.
An image plane 380 of the optical imaging system 300 is located on a side of the optical sensing element 370 facing the fourth lens 350, a diagonal length of the optical sensing element 370 is 2.056, and a ratio of the average effective diameter to the diagonal length is 0.586.
TABLE III lens data of the third embodiment
In summary, the third table shows detailed structural data of the third embodiment of fig. 3, wherein the units of the radius of curvature, the thickness and the effective radius are mm, and the surfaces 1-12 sequentially represent an object-side surface 321 of the first lens element 320, an image-side surface 322 of the first lens element 320, the aperture stop, an object-side surface 331 of the second lens element 330, an image-side surface 332 of the second lens element 330, an object-side surface 341 of the third lens element 340, an image-side surface 342 of the third lens element 340, the object-side surface 351 of the fourth lens element 350, the image-side surface 352 of the fourth lens element 350, the object-side surface of the filter element 360, the image-side surface of the filter element 360 and the image plane 380.
Claims (18)
1. An optical imaging system, in order from an object side to an image side comprising:
a first lens element with refractive power;
a second lens element with refractive power;
a third lens element with refractive power;
a fourth lens element with refractive power; and
an optical sensing element, one side facing the fourth lens is an imaging surface of the optical imaging system;
the fourth lens element has an object-side surface and an image-side surface, the object-side surface of the fourth lens element has a first effective diameter, the image-side surface of the fourth lens element has a second effective diameter, an average of the first effective diameter and the second effective diameter is an average effective diameter, the optical sensing element has a diagonal length, and a ratio of the average effective diameter to the diagonal length is between 0.58 and 0.7.
2. The optical imaging system of claim 1, wherein the fourth lens element has a first invalid length at the object-side surface and a second invalid length at the image-side surface, the first invalid length being a distance from an edge of an optically effective area of the fourth lens element at the object-side surface to an edge of the object-side surface of the fourth lens element, the second invalid length being a distance from an edge of an optically effective area of the fourth lens element at the image-side surface to an edge of the image-side surface of the fourth lens element, the first invalid length and the second invalid length each being 0.1 mm.
3. The optical imaging system of claim 1 or 2, wherein the optical imaging system has a maximum field of view angle between 75 degrees and 88 degrees.
4. The optical imaging system of claim 3, comprising an aperture implemented in one of the following embodiments I and II:
the diaphragm is arranged on one side of the first lens, which does not face the second lens;
in embodiment ii, the aperture is disposed between any two adjacent lenses of the first lens and the fourth lens.
5. The optical imaging system of claim 4, wherein the aperture has an aperture value of 2.0.
6. The optical imaging system of claim 5, wherein the optical imaging system comprises a filter element disposed between the fourth lens element and the imaging surface.
7. The optical imaging system of claim 6, wherein at least one of the object side surface and the image side surface of the fourth lens element has at least one inflection point.
8. The optical imaging system of claim 7, wherein at least one of the object-side surface and the image-side surface of the fourth lens element is aspheric.
9. The optical imaging system of claim 8, wherein the object-side surface and the image-side surface of the fourth lens element are aspheric.
10. The optical imaging system of claim 1 or 2, comprising an aperture in one of the following embodiments i and ii:
the diaphragm is arranged on one side of the first lens, which does not face the second lens;
in embodiment ii, the aperture is disposed between any two adjacent lenses of the first lens and the fourth lens.
11. The optical imaging system of claim 10, wherein the aperture has an aperture value of 2.0.
12. The optical imaging system of claim 11, wherein the optical imaging system comprises a filter element disposed between the fourth lens element and the imaging surface.
13. The optical imaging system of claim 12, wherein at least one of the object side surface and the image side surface of the fourth lens element has at least one inflection point.
14. The optical imaging system of claim 13, wherein at least one of the object-side surface and the image-side surface of the fourth lens element is aspheric.
15. The optical imaging system of claim 14, wherein the object-side surface and the image-side surface of the fourth lens element are aspheric.
16. The optical imaging system of claim 1 or 2, wherein the optical imaging system comprises a filter element disposed between the fourth lens element and the imaging surface.
17. The optical imaging system of claim 1 or 2, wherein at least one of the object side surface and the image side surface of the fourth lens has at least one inflection point.
18. The optical imaging system of claim 1 or 2, wherein at least one of the object-side surface and the image-side surface of the fourth lens element is aspheric.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123019217.1U CN216248540U (en) | 2021-12-03 | 2021-12-03 | Optical imaging system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123019217.1U CN216248540U (en) | 2021-12-03 | 2021-12-03 | Optical imaging system |
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| CN216248540U true CN216248540U (en) | 2022-04-08 |
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| CN202123019217.1U Active CN216248540U (en) | 2021-12-03 | 2021-12-03 | Optical imaging system |
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- 2021-12-03 CN CN202123019217.1U patent/CN216248540U/en active Active
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Effective date of registration: 20220722 Address after: 3, No. six road 8, industrial zone, Tun Tong, Taichung City, Taiwan, China Patentee after: JIUHE PHOTOELECTRIC Co.,Ltd. Patentee after: JIANGSU JIUHE PHOTOELECTRIC Co.,Ltd. Address before: Floor 3, No. 8, 6th Road, industrial zone, Xitun District, Taichung City Patentee before: JIUHE PHOTOELECTRIC Co.,Ltd. |