CN218547114U - Low-distortion double-telecentric optical lens - Google Patents
Low-distortion double-telecentric optical lens Download PDFInfo
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- CN218547114U CN218547114U CN202222346908.0U CN202222346908U CN218547114U CN 218547114 U CN218547114 U CN 218547114U CN 202222346908 U CN202222346908 U CN 202222346908U CN 218547114 U CN218547114 U CN 218547114U
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Abstract
The utility model discloses a two telecentric optics camera lenses of low distortion, follow the first plane glass that the optical axis direction arranged in proper order from the object space to the image space, have the second lens of positive focal power, have the third lens of positive focal power, have the fourth lens of positive focal power, have the fifth lens of negative focal power, diaphragm, have the sixth lens of negative focal power, have the seventh lens of positive focal power and have the eighth lens of positive focal power; the fourth lens and the fifth lens form a first double-gluing piece, and the sixth lens and the seventh lens form a second double-gluing piece. The embodiment of the utility model provides a can keep high resolution, little distortion, low telecentric degree under different ambient temperature, but wide application in optical imaging technical field.
Description
Technical Field
The utility model relates to an optical imaging technical field especially relates to a two telecentric optics camera lenses of low distortion.
Background
Modern industrial technology is developed at a high speed, an industrial lens is taken as an important detection element in the optical field, and the focal depth of a telecentric lens is deeper and is determined by the focal lengths of a front lens group and a rear lens group. The traditional lens causes errors due to different magnifications at different object distances; the telecentric lens is designed by parallel light paths, images perpendicular to the optical axis, and can eliminate the distortion caused by different object distances. At present, industrial integration is increasingly accelerated, more instruments are continuously developed towards ultra-high precision, and in order to ensure the product quality in production, a precision detection system is derived along with the market, and an industrial lens becomes a very important optical device in the field of industrial measurement. At present, an optical lens which can maintain the characteristics of high resolution, small distortion, low telecentricity and the like at different environmental temperatures and has wider environmental adaptability is needed.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a low-distortion double-telecentric optical lens, which can maintain high resolution, small distortion and low telecentricity at different environmental temperatures.
The embodiment of the utility model provides a two telecentric optics camera lenses of low distortion, along the optical axis direction from the object space to the first plane glass of image space range in proper order, have the second lens of positive focal power, have the third lens of positive focal power, have the fourth lens of positive focal power, have the fifth lens of negative focal power, diaphragm, have the sixth lens of negative focal power, have the seventh lens of positive focal power and have the eighth lens of positive focal power; the fourth lens and the fifth lens form a first double-gluing piece, and the sixth lens and the seventh lens form a second double-gluing piece.
Optionally, the second lens element is a biconvex lens element, the third lens element is a meniscus lens element, the fourth lens element is a biconvex lens element, the fifth lens element is a biconcave lens element, the sixth lens element is a biconcave lens element, the seventh lens element is a biconvex lens element, and the eighth lens element is a biconvex lens element.
Optionally, the first plane glass to the fifth lens form a front lens group, and the stop, the sixth lens to the eighth lens form a rear lens group, wherein the front lens group and the rear lens group satisfy the following formula:
2.9＜F1/F2＜3.9
where F1 denotes a focal length of the front lens group, and F2 denotes a focal length of the rear lens group.
Optionally, the focal lengths of the first and second double glue meet the following formula:
-0.86＜F3/F4＜-0.6
where F3 denotes the focal length of the first dual glue and F4 denotes the focal length of the second dual glue.
Optionally, the focal length of the first double cemented piece and the second lens satisfies the following formula:
-0.155＜F3/f2＜-0.13
where F3 denotes the focal length of the first double cemented element, and F2 denotes the focal length of the second lens.
Optionally, the focal length of the first double cemented piece and the third lens satisfies the following formula:
-0.2＜F3/f3＜-0.05
where F3 denotes a focal length of the first double cemented element, and F3 denotes a focal length of the third lens.
Optionally, the focal length of the second double cemented piece and the eighth lens satisfies the following formula:
-0.4＜F4/f4＜-0.6
where F4 denotes a focal length of the second double cemented element, and F4 denotes a focal length of the eighth lens.
Optionally, the working distance of the optical lens and the total length of the optical lens satisfy the following formula:
0.66＜T1/T2＜0.86
where T1 is the working distance of the optical lens and T2 is the total length of the optical lens.
Implement the embodiment of the utility model provides a include following beneficial effect: in the embodiment, the optical lens comprises a first plane glass, a second lens with positive focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with negative focal power, a diaphragm, a sixth lens with negative focal power, a seventh lens with positive focal power and an eighth lens with positive focal power, wherein the first lens and the fifth lens form a first double-adhesive part, the second lens and the seventh lens form a second double-adhesive part, and the high resolution, the small distortion and the low telecentricity are kept at different ambient temperatures by matching material temperature coefficients of the lenses at high and low temperatures.
Drawings
Fig. 1 is a schematic structural diagram of a low distortion double telecentric optical lens provided by an embodiment of the present invention;
fig. 2 is an optical path diagram of a first low-distortion double-telecentric optical lens provided by an embodiment of the present invention;
fig. 3 is a field curvature distortion diagram of a first low-distortion double-telecentric optical lens provided in an embodiment of the present invention;
fig. 4 is an incident angle and image height diagram of a first low-distortion double-telecentric optical lens provided by an embodiment of the present invention;
fig. 5 is an analytic graph of a modulation transfer function of a first low-distortion double-telecentric optical lens according to an embodiment of the present invention;
fig. 6 is a diagram of a temperature drift of a first low-distortion double-telecentric optical lens at 20 ℃;
fig. 7 is a diagram of a temperature drift of a first low-distortion double-telecentric optical lens at-40 ℃;
fig. 8 is a diagram of a temperature drift of a first low-distortion double-telecentric optical lens at 60 ℃;
fig. 9 is an optical path diagram of a second low-distortion double-telecentric optical lens provided in the embodiment of the present invention;
fig. 10 is a field curvature distortion diagram of a second low-distortion double-telecentric optical lens according to an embodiment of the present invention;
fig. 11 is an incident angle and image height diagram of a second low-distortion double-telecentric optical lens according to an embodiment of the present invention;
fig. 12 is an analytic graph of a modulation transfer function of a second low-distortion double-telecentric optical lens according to an embodiment of the present invention;
fig. 13 is a temperature drift diagram of a second low-distortion double-telecentric optical lens provided by an embodiment of the present invention at 20 ℃;
fig. 14 is a diagram of a temperature drift of a second low-distortion double-telecentric optical lens at-40 ℃;
fig. 15 is a temperature drift diagram of a second low-distortion double-telecentric optical lens at 60 ℃.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, an embodiment of the present invention provides a low-distortion double-telecentric optical lens, which includes a first plane glass L1, a second lens L2 with positive focal power, a third lens L3 with positive focal power, a fourth lens L4 with positive focal power, a fifth lens L5 with negative focal power, a diaphragm S, a sixth lens L6 with negative focal power, a seventh lens L7 with positive focal power, and an eighth lens L8 with positive focal power, which are sequentially arranged along an optical axis direction from an object space to an image space; the fourth lens L4 and the fifth lens L5 form a first double-cemented element, and the sixth lens L6 and the seventh lens L7 form a second double-cemented element.
Optionally, the second lens element is a biconvex lens element, the third lens element is a meniscus lens element, the fourth lens element is a biconvex lens element, the fifth lens element is a biconcave lens element, the sixth lens element is a biconcave lens element, the seventh lens element is a biconvex lens element, and the eighth lens element is a biconvex lens element.
Optionally, the first plane glass to the fifth lens form a front lens group, and the stop, the sixth lens to the eighth lens form a rear lens group, wherein the front lens group and the rear lens group satisfy the following formula:
2.9＜F1/F2＜3.9
where F1 denotes a focal length of the front lens group, and F2 denotes a focal length of the rear lens group.
Optionally, the focal lengths of the first and second double glue meet the following formula:
-0.86＜F3/F4＜-0.6
where F3 denotes the focal length of the first dual glue, and F4 denotes the focal length of the second dual glue.
Optionally, the focal length of the first double cemented piece and the second lens satisfies the following formula:
-0.155＜F3/f2＜-0.13
where F3 denotes the focal length of the first double cemented element, and F2 denotes the focal length of the second lens.
Optionally, a focal length of the first double cemented piece and the third lens satisfies the following formula:
-0.2＜F3/f3＜-0.05
where F3 denotes a focal length of the first double cemented element, and F3 denotes a focal length of the third lens.
Optionally, the focal length of the second double cemented piece and the eighth lens satisfies the following formula:
-0.4＜F4/f4＜-0.6
where F4 denotes a focal length of the second double cemented element, and F4 denotes a focal length of the eighth lens.
Optionally, the working distance of the optical lens and the total length of the optical lens satisfy the following formula:
0.66＜T1/T2＜0.86
where T1 is the working distance of the optical lens and T2 is the total length of the optical lens.
The performance of the optical lens in the present application is explained in two specific embodiments.
Example one
The parameters of the low-distortion double-telecentric optical lens are shown in the table I, and the light path diagram is shown in FIG. 2. Wherein R represents a curvature radius, S0 is an object plane from an object space to an image space along an optical axis, S1 is a front surface of the first planar lens, and S2 is a rear surface of the first planar lens; s3 is the front surface of the second lens, and S4 is the rear surface of the second lens; s5 is the front surface of the third lens, and S6 is the rear surface of the third lens; s7 is the front surface of the fourth lens, and S8 is the gluing surface of the fourth lens and the fifth lens; s9 is the rear surface of the fifth lens; s10, setting the position of a diaphragm; s11 is the front surface of the sixth lens, and S12 is the cemented surface of the sixth lens and the seventh lens; s13 is a rear surface of the seventh lens; s14 is a front surface of the eighth lens, and S15 is a rear surface of the eighth lens. The test results are shown in fig. 3 to 8: as can be seen from fig. 3, the distortion of the low-distortion double-telecentric optical lens of the present application is less than 0.1; as can be seen from the graph of fig. 4 in which the incident angle of the chief ray varies with the image height, the variation of the chief ray with the image height is small; as can be seen from fig. 5, the low distortion double telecentric optical lens of the present application has high resolution; as can be seen from fig. 6 to 8, the optical performance of the low distortion double telecentric optical lens of the present application is less affected by temperature.
| Noodle | R value | Thickness of | Refractive index of material | Abbe number |
| S0 | Infinite number of elements | 110 | ||
| S1 | Infinite number of elements | 1.5 | 1.5167 | 64.198 |
| S2 | Infinite number of elements | 5.455806 | ||
| S3 | 176.9 | 4.26 | 1.7552 | 27.547 |
| S4 | -201.107 | 7.56 | ||
| S5 | 53.57 | 5.28 | 1.58912 | 61.247 |
| S6 | 116.57 | 50.01 | ||
| S7 | 13.1 | 3.51 | 1.603 | 65.459 |
| S8 | -26.6315 | 2.76 | 1.76182 | 26.613 |
| S9 | 6.378 | 7.45 | ||
| S10 | Unlimited in size | 2.16 | ||
| S11 | -41.24 | 2.540289 | 1.9108 | 35.25 |
| S12 | 21.95318 | 3.94 | 1.744 | 44.904 |
| S13 | -11 | 33.25 | ||
| S14 | 205.7092 | 4.21 | 1.8061 | 33.286 |
| S15 | -42.9132 | 21.6 |
Example two
The parameters of the low distortion double telecentric optical lens are shown in table two, and the light path diagram is shown in fig. 9. From the object space to the image space along the optical axis, S0 is an object plane, S1 is a virtual plane, S2 is the front surface of the first planar lens, and S3 is the rear surface of the first planar lens; s4 is the front surface of the second lens, S5 is the rear surface of the second lens; s6 is the front surface of the third lens, and S7 is the gluing surface of the third lens and the fourth lens; s8 is the rear surface of the fourth lens; s9 is the position of a diaphragm; s10 is the front surface of the fifth lens, and S11 is the gluing surface of the fifth lens and the sixth lens; s12 is the rear surface of the sixth lens element; s13 is a front surface of the seventh lens, and S14 is a rear surface of the seventh lens. The test results are shown in fig. 10 to 15: as can be seen from fig. 10, the distortion of the low-distortion double telecentric optical lens of the present application is less than 0.1; as can be seen from the graph of fig. 11, in which the incident angle of the chief ray varies with the image height, the angular variation of the chief ray with the image height is small; as can be seen from fig. 12, the low distortion double telecentric optical lens of the present application has high resolution; as can be seen from fig. 13 to 15, the optical performance of the low distortion double telecentric optical lens of the present application is less affected by temperature.
Watch two
| Flour | R value | Thickness of | Refractive index of material | Abbe number |
| S0 | Infinite number of elements | 110 | ||
| S1 | Unlimited in size | 2 | ||
| S2 | 224.3988 | 3.619237 | 1.7552 | 27.547 |
| S3 | -178.918 | 14.10804 | ||
| S4 | 56.70902 | 5.631188 | 1.58912 | 61.247 |
| S5 | 129.6871 | 50.0075 | ||
| S6 | 11.34773 | 3.550191 | 1.603 | 65.459 |
| S7 | -58.6622 | 3.042608 | 1.76182 | 26.613 |
| S8 | 6.03783 | 6.160897 | ||
| S9 | Infinite number of elements | 2.22132 | ||
| S10 | -34.6938 | 4.07838 | 1.9108 | 35.25 |
| S11 | 27.25066 | 4.073033 | 1.744 | 44.904 |
| S12 | -11.1381 | 31.27193 | ||
| S13 | 207.2577 | 4.004666 | 1.8061 | 33.286 |
| S14 | -43.3299 | 21.24248 |
Implement the embodiment of the utility model provides a include following beneficial effect: in the embodiment, the optical lens is sequentially arranged from an object space to an image space along an optical axis direction, and comprises a first plane glass, a second lens with positive focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with negative focal power, a diaphragm, a sixth lens with negative focal power, a seventh lens with positive focal power and an eighth lens with positive focal power, wherein the fourth lens and the fifth lens form a first double-adhesive piece, the sixth lens and the seventh lens form a second double-adhesive piece, and high resolution, small distortion and low telecentricity can be kept at different environmental temperatures by matching material temperature coefficients of the lenses at high and low temperatures.
Claims (8)
1. A low-distortion double-telecentric optical lens is characterized by comprising a first plane glass, a second lens with positive focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with negative focal power, a diaphragm, a sixth lens with negative focal power, a seventh lens with positive focal power and an eighth lens with positive focal power which are sequentially arranged from an object space to an image space along the optical axis direction; the fourth lens and the fifth lens form a first double-cemented piece, and the sixth lens and the seventh lens form a second double-cemented piece.
2. An optical lens barrel according to claim 1, wherein the second lens element is a double convex lens element, the third lens element is a meniscus lens element, the fourth lens element is a double convex lens element, the fifth lens element is a double concave lens element, the sixth lens element is a double concave lens element, the seventh lens element is a double convex lens element, and the eighth lens element is a double convex lens element.
3. An optical lens according to claim 1, wherein the first plane glass to the fifth lens constitute a front lens group, and the stop, the sixth lens to the eighth lens constitute a rear lens group, wherein the front lens group and the rear lens group satisfy the following formula:
2.9＜F1/F2＜3.9
where F1 denotes a focal length of the front lens group, and F2 denotes a focal length of the rear lens group.
4. An optical lens according to claim 1, wherein the focal lengths of the first and second double glue satisfy the following formula:
-0.86＜F3/F4＜-0.6
where F3 denotes the focal length of the first dual glue, and F4 denotes the focal length of the second dual glue.
5. An optical lens according to claim 1, wherein the focal lengths of the first double glue and the second lens satisfy the following formula:
-0.155＜F3/f2＜-0.13
where F3 denotes the focal length of the first double cemented element, and F2 denotes the focal length of the second lens.
6. An optical lens according to claim 1, wherein the focal lengths of the first double glue and the third lens satisfy the following formula:
-0.2＜F3/f3＜-0.05
where F3 denotes a focal length of the first double cemented element, and F3 denotes a focal length of the third lens.
7. An optical lens according to claim 1, wherein the focal lengths of the second double glue and the eighth lens satisfy the following formula:
-0.4＜F4/f4＜-0.6
where F4 denotes a focal length of the second double cemented element, and F4 denotes a focal length of the eighth lens.
8. An optical lens according to claim 1, wherein the working distance of the optical lens and the total length of the optical lens satisfy the following formula:
0.66＜T1/T2＜0.86
where T1 is the working distance of the optical lens and T2 is the total length of the optical lens.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222346908.0U CN218547114U (en) | 2022-09-02 | 2022-09-02 | Low-distortion double-telecentric optical lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222346908.0U CN218547114U (en) | 2022-09-02 | 2022-09-02 | Low-distortion double-telecentric optical lens |
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| CN218547114U true CN218547114U (en) | 2023-02-28 |
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| CN202222346908.0U Active CN218547114U (en) | 2022-09-02 | 2022-09-02 | Low-distortion double-telecentric optical lens |
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