CN109058934B - High telecentricity parallel light source with emergent light diameter of 70mm - Google Patents
High telecentricity parallel light source with emergent light diameter of 70mm Download PDFInfo
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- CN109058934B CN109058934B CN201810946524.8A CN201810946524A CN109058934B CN 109058934 B CN109058934 B CN 109058934B CN 201810946524 A CN201810946524 A CN 201810946524A CN 109058934 B CN109058934 B CN 109058934B
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- 239000000463 material Substances 0.000 description 5
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- 230000000694 effects Effects 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000005331 crown glasses (windows) Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000005308 flint glass Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/04—Refractors for light sources of lens shape
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Abstract
The invention discloses a high telecentricity parallel light source with an emergent light diameter of 70mm, wherein an optical path system of the light source sequentially comprises a first lens G1 with negative focal power and a biconcave structure, a second lens G2 with positive focal power and a biconvex structure, and a third lens G3 with positive focal power and a biconvex or plano-convex structure; the first lens G1 and the second lens G2 combine to form a cemented lens B, the focal length of the optical path system is f, the focal length of the cemented lens B is fB, and they satisfy the following relation: 9< |fB/f| <11. The first lens G1 and the second lens G2 form a cemented lens B for condensing light, controlling the emergent wave surface of the chief ray to be vertical to the optical axis, the third lens G3 receives the emergent ray of the cemented lens B, and controlling the emergent wave surface of the chief ray to be vertical to the optical axis, so that the parallelism of the optical path system is less than 0.05, the parallelism is high, and the excellent depth of field range is provided.
Description
Technical Field
The invention relates to the technical field of light sources, in particular to a high-telecentricity parallel light source with an emergent light diameter of 70mm.
Background
At present, the existing parallel light source products such as common coaxial light have the defects of low parallelism, small depth of field range, light diffusion to the side surface of an object due to backlight diffusion, obvious boundary effect, difficulty in obtaining images with clear and sharp edges and reduced contrast of the object to be measured. In some application environments with high requirements on the parallelism of the light source (such as providing parallel illumination for a telecentric lens, the high telecentricity parallel illumination can make the efficiency of the telecentric lens fully play), the parallel light source in the prior art is insufficient to meet the requirements. In addition, with the increase of the caliber of the parallel light source, the total length of the light source system is increased, and the total length of some large-caliber light source products is more than 3 times of the caliber value of the light source, so that a large amount of use space is occupied, and the installation difficulty is increased.
Disclosure of Invention
The invention aims at: aiming at the defects of the prior art, the high telecentricity parallel light source with the emergent light diameter of 70mm is provided.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the high telecentricity parallel light source with the emergent light diameter of 70mm comprises a mechanical system and an optical path system arranged in the mechanical system, wherein the optical path system sequentially comprises a first lens G1 with negative focal power and a biconcave structure, a second lens G2 with positive focal power and a biconvex structure, and a third lens G3 with positive focal power and a biconvex or plano-convex structure; the first lens G1 and the second lens G2 are combined to form a cemented lens B, the focal length of the optical path system is f, the focal length of the cemented lens B is fB, and they satisfy the following relation: 9< |fB/f| <11; the focal length of the third lens G3 is f3, and the following relation is satisfied with f: 0.5 < f3/f < 1.5.
As an improvement of the present invention, the refractive index of the first lens G1 is n1, the abbe number is v1, which satisfies the relation: 1.90< n1<2.05;20< v1<30.
As an improvement of the present invention, the refractive index of the second lens G2 is n2, and the abbe number is v2, which satisfies the relation: 1.55< n2<1.65;60< v2<70.
As an improvement of the present invention, the optical lens further includes a light source placement point S, an interval L1 between the light source placement point S and the first lens G1 on the optical axis is 118.148mm, and an interval L2 between the second lens G2 and the third lens G3 on the optical axis is 10mm.
As an improvement of the present invention, the radius of curvature R1 of the first lens G1 is 552.196mm, the radius of curvature R2 of the first lens G1 is 216.850mm, and the center thickness of the optical axis of the first lens G1 is 3mm.
As an improvement of the present invention, the radius of curvature R3 of the second lens G2 is 216.850mm, the radius of curvature R4 of the second lens G2 is 140.852mm, and the center thickness of the optical axis of the second lens G2 is 10mm.
As an improvement of the present invention, the radius of curvature R5 of the third lens G3 is 700.229mm, the radius of curvature R6 of the third lens G3 is 157.245mm, and the center thickness of the optical axis of the third lens G3 is 8.851mm.
The invention has the beneficial effects that: the first lens G1 and the second lens G2 form a cemented lens B for condensing light, controlling the emergent wave surface of the principal ray on the cemented lens B to be vertical to the optical axis, the third lens G3 receives the emergent ray of the cemented lens B, and controlling the emergent wave surface of the principal ray on the third lens G3 to be vertical to the optical axis (even if the principal ray is parallel to the optical axis), so that the parallelism of an optical path system is less than 0.05, and the invention has excellent depth of field range because of high parallelism; the high parallelism ensures that the relative position of the light source and the detection equipment has little influence on the parallel entering of the light rays into the lens, and can also improve the edge contour contrast of the detected object in the detection system and eliminate the boundary effect. Before the light path turns, the focal length distribution of the cemented lens B and the third lens G3 can reduce the ratio of the total length of the light source system to the aperture of the light source to 2; meanwhile, one or two times of light path turning can be carried out between the light source placing point S and the first lens G1, so that the total length of the light path system is reduced, and the total length of the light path system can be compressed to be less than 95mm to the greatest extent. In addition, the refractive index and Abbe number distribution of each lens can enable the optical path system to be compatible with visible light in the wavelength range of 420 nm-650 nm.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
FIG. 1 is a schematic diagram of an optical path system according to the present invention;
FIG. 2 is one of the schematic optical path diagrams of the optical path system of the present invention (showing the effective exit angle and spot diameter);
FIG. 3 is a second schematic diagram of the optical path system according to the present invention;
FIG. 4 is a third schematic diagram of the optical path system (with a mirror) according to the present invention.
Detailed Description
Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As used throughout the specification and claims, the word "comprise" is an open-ended term, and thus should be interpreted to mean "include, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art is able to solve the technical problem within a certain error range, substantially achieving the technical effect.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The present invention will be described in further detail below with reference to the drawings, but is not limited thereto.
As shown in fig. 1 to 4, a parallel light source with a high telecentricity and an emergent light diameter of 70mm comprises a mechanical system and a light path system 100 arranged in the mechanical system, wherein the light path system 100 sequentially comprises a first lens G1 with negative focal power and a biconcave structure, a second lens G2 with positive focal power and a biconvex structure, and a third lens G3 with positive focal power and a biconvex or plano-convex structure; the first lens G1 and the second lens G2 combine to form a cemented lens B, the focal length of the optical path system 100 is f, and the focal length of the cemented lens B is fB, which satisfy the following relation: 9< |fB/f| <11. The focal length of the third lens G3 is f3, and the following relation is satisfied with f: 0.5 < f3/f < 1.5.
Preferably, the refractive index of the first lens G1 is n1, the abbe number is v1, which satisfies the relation: 1.90< n1<2.05;20< v1<30. The refractive index of the second lens G2 is n2, the abbe number is v2, which satisfies the relation: 1.55< n2<1.65;60< v2<70.
The invention also includes a light source placement point S, where the light source of the light source placement point S can emit light at a certain angle, which forms parallel light through the optical path system 100. The distance L1 between the light source placement point S and the first lens G1 on the optical axis 10 is 118.148mm, and the distance L2 between the second lens G2 and the third lens G3 on the optical axis 10 is 10mm. The cemented lens B and the third lens G3 are close to each other, so that the light path is turned between the light source placement points S and G1, and the length of the light path system 100 is further shortened. In addition, the present invention may further include a reflecting mirror 20, wherein the reflecting mirror 20 has a V-shaped structure, and is mainly used for reflecting the light beam of the light source placement point S to the first lens G1, and finally sequentially passing through the second lens G2 and the third lens G3.
Preferably, the radius of curvature R1 of the first lens G1 is 552.196mm, the radius of curvature R2 of the first lens G1 is 216.850mm, the center thickness of the optical axis 10 of the first lens G1 is 3mm, the material of the first lens G1 is duyun-zhiaf 90 (refractive index is 2.00, abbe number is 25.4), and the maximum outer diameter is controlled to be 70mm. The radius of curvature R3 of the second lens G2 is 216.850mm, the radius R3 is the same as the radius R2, the radius of curvature R4 of the second lens G2 is 140.852mm, the center thickness of the optical axis 10 of the second lens G2 is 10mm, the material of the second lens G2 is Du Zhu Ming glass H-ZPK A (refractive index is 1.60, abbe number is 65.5), and the maximum outer diameter is controlled to be 70mm. The radius of curvature R5 of the third lens G3 is 700.229mm, the radius of curvature R6 of the third lens G3 is 157.245mm, the center thickness of the optical axis 10 of the third lens G3 is 8.851mm, the material of the third lens G3 is cheng zhu optical glass H-ZLAF2A (refractive index is 1.80, abbe number is 46.8), and the maximum outer diameter is controlled to be 80mm.
In this embodiment, the total length L of the optical path system 100 is 150mm, the light source exit angle at s is 30 °, and the maximum telecentricity is less than 0.03. The spot diameter of the light source is 70mm. In addition, the length of the optical path system 100 is shortened to 93mm through two optical path turns.
It should be noted that: since the invention is used for illumination, no strict correction of aberration is required, but in order to make the system possess good telecentricity (even if the principal ray of the image side of the system is as parallel to the optical axis as possible), two optical powers are allocated when designing a parallel light source system, set as Φ1 and Φ2, i.e. the system has two optical groups; let the combined focal length of the whole parallel light source system be f, the focal power be phi, the distance between two light groups be d, they have the following relation: 1/f=Φ1+Φ2-dΦ1Φ2. Because the system is an image-side telecentric optical path, the distance from the diaphragm (focal plane, light source) to the second optical group is the total length of the system, which is set to L, approximately equal to the combined focal length f. In addition, the exit angle of the chief ray of the diaphragm (focal plane, light source) is related to the overall system length (combined focal length f), and the smaller the overall system length (combined focal length f), the larger the exit angle of the chief ray of the diaphragm (focal plane, light source) is, but the design difficulty and complexity are increased. Therefore, when designing the parallel light source system, the total length L of the system and the optical powers Φ1 and Φ2 of the two light groups are reasonably distributed according to the above relation, the total length of the system is shortened as much as possible under the condition of keeping the telecentricity of the system, the emergence angle of the chief ray of the diaphragm (focal plane, light source) is increased, and meanwhile, in order to turn the light path between the diaphragm (focal plane) and the first light group, the distance d between the two light groups needs to be considered.
In addition, the invention requires compatibility with visible light in the wavelength range of 420 nm-650 nm, therefore, the first optical group of the system is designed into a double-cemented lens, the focal power of the double-cemented lens is the distributed phi 1, and the chromatic aberration is reduced by selecting a proper glass material. The second optical group is mainly for focusing and balancing aberration, and the material of the second optical group can be primarily selected as flint glass with high refractive index or crown glass for balancing chromatic aberration.
The invention can be seen as an image side telecentric light path, i.e. where the diaphragm is placed at the object side focal plane of the optical system and the chief ray of the image side is parallel to the optical axis, whereby a parallel light source is placed at the object side focal plane of the system for obtaining parallel light.
While the foregoing description illustrates and describes several preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as limited to other embodiments, and is capable of numerous other combinations, modifications and environments and is capable of changes or modifications within the scope of the inventive concept as described herein, either as a result of the foregoing teachings or as a result of the knowledge or technology in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (6)
1. The utility model provides a high telecentricity parallel light source that emergent light diameter is 70mm which characterized in that: the lens comprises a mechanical system, a light source placement point S and a light path system arranged in the mechanical system, wherein the light path system sequentially comprises a first lens G1 with negative focal power and a biconcave structure, a second lens G2 with positive focal power and a biconvex structure, and a third lens G3 with positive focal power and a biconvex or plano-convex structure; the first lens G1 and the second lens G2 are combined to form a cemented lens B, the focal length of the optical path system is f, the focal length of the cemented lens B is fB, and they satisfy the following relation: 9< |fB/f| <11; the focal length of the third lens G3 is f3, and the following relation is satisfied with f: 0.5 < f3/f < 1.5; the distance L1 between the light source placement point S and the first lens G1 on the optical axis is 118.148mm, and the distance L2 between the second lens G2 and the third lens G3 on the optical axis is 10mm.
2. The high telecentricity parallel light source of claim 1 wherein the exit light diameter is 70mm, characterized in that: the refractive index of the first lens G1 is n1, the abbe number is v1, which satisfies the relation: 1.90< n1<2.05;20< v1<30.
3. The high telecentricity parallel light source of claim 1 wherein the exit light diameter is 70mm, characterized in that: the refractive index of the second lens G2 is n2, the abbe number is v2, which satisfies the relation: 1.55< n2<1.65;60< v2<70.
4. The high telecentricity parallel light source of claim 1 wherein the exit light diameter is 70mm, characterized in that: the curvature radius R1 of the first lens G1 is 552.196mm, the curvature radius R2 of the first lens G1 is 216.850mm, and the center thickness of the optical axis of the first lens G1 is 3mm.
5. The high telecentricity parallel light source of claim 1 wherein the exit light diameter is 70mm, characterized in that: the curvature radius R3 of the second lens G2 is 216.850mm, the curvature radius R4 of the second lens G2 is 140.852mm, and the center thickness of the optical axis of the second lens G2 is 10mm.
6. The high telecentricity parallel light source of claim 1 wherein the exit light diameter is 70mm, characterized in that: the radius of curvature R5 of the third lens G3 is 700.229mm, the radius of curvature R6 of the third lens G3 is 157.245mm, and the center thickness of the optical axis of the third lens G3 is 8.851mm.
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| CN201810946524.8A CN109058934B (en) | 2018-08-20 | 2018-08-20 | High telecentricity parallel light source with emergent light diameter of 70mm |
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| CN109058934B true CN109058934B (en) | 2024-01-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112986954A (en) * | 2019-12-17 | 2021-06-18 | 上海禾赛科技股份有限公司 | Laser radar transmitting unit, laser radar receiving unit and laser radar |
| CN111458864B (en) * | 2020-04-27 | 2023-09-29 | 中国科学院西安光学精密机械研究所 | Light collecting lens with calibratable optical axis and optical axis calibration method |
| CN114326055B (en) * | 2021-12-30 | 2024-01-12 | 深圳市韵腾激光科技有限公司 | Infrared field lens with large scanning angle |
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| CN205067851U (en) * | 2015-09-01 | 2016-03-02 | 深圳市三优光电有限公司 | Heart projecting lens far away |
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| CN209262933U (en) * | 2018-08-20 | 2019-08-16 | 广东奥普特科技股份有限公司 | The high telecentricity source of parallel light that a kind of emergent light diameter is 70mm |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI476452B (en) * | 2007-12-14 | 2015-03-11 | 尼康股份有限公司 | Diffractive optical systems and optical machines |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000028919A (en) * | 1998-07-09 | 2000-01-28 | Mamiya Op Co Ltd | Middle telephotographic lens |
| CN205067851U (en) * | 2015-09-01 | 2016-03-02 | 深圳市三优光电有限公司 | Heart projecting lens far away |
| CN205427336U (en) * | 2016-02-29 | 2016-08-03 | 中山联合光电科技股份有限公司 | Virtual reality optical system |
| JP2018010218A (en) * | 2016-07-15 | 2018-01-18 | 株式会社ニコン | Eyepiece optical system, optical instrument, and eyepiece optical system manufacturing method |
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