CN209979837U - Stray light eliminating device - Google Patents
Stray light eliminating device Download PDFInfo
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- CN209979837U CN209979837U CN201821907155.3U CN201821907155U CN209979837U CN 209979837 U CN209979837 U CN 209979837U CN 201821907155 U CN201821907155 U CN 201821907155U CN 209979837 U CN209979837 U CN 209979837U
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Abstract
The application relates to a stray light eliminating device, comprising: the device comprises a light extinction cavity, a receiving lens arranged in the light extinction cavity, a receiving element arranged outside the light extinction cavity, a light extinction diaphragm arranged in the light extinction cavity and a light extinction cylinder wall; the receiving lens, the receiving element and the extinction cylinder wall are positioned on the same optical axis; the extinction diaphragm is positioned in the focal region of the receiving lens, and a light through hole is formed in the axis position of the extinction diaphragm; the extinction barrel wall is located between the extinction diaphragm and the receiving element. The stray light eliminating device provided by the application can enable the stray light eliminating effect to be better, and received signal beams are better.
Description
Technical Field
The utility model relates to a radar field especially relates to a stray light remove device.
Background
At present, receiving sensing devices mostly used by laser radars are sensitive, and the higher the sensitivity of the receiving sensing devices is, the better the signals reflected by the target objects are received. However, a sensor device with higher sensitivity requires a higher level of stray light elimination in the receiving device.
The traditional method for eliminating the stray light is to perform anodic oxidation black treatment on the surface of the cavity cylinder, and the method can only eliminate a small part of the stray light and has poor effect.
SUMMERY OF THE UTILITY MODEL
Therefore, there is a need to provide a stray light elimination apparatus to reduce the influence of stray light on the laser radar receiving signal and improve the signal receiving capability of the laser radar receiving system.
A stray light elimination apparatus comprising: the device comprises a light extinction cavity, a receiving lens arranged in the light extinction cavity, a receiving element arranged outside the light extinction cavity, a light extinction diaphragm arranged in the light extinction cavity and a light extinction cylinder wall; the receiving lens, the receiving element and the extinction cylinder wall are positioned on the same optical axis;
the extinction diaphragm is positioned in the focal region of the receiving lens, and a light through hole is formed in the axis position of the extinction diaphragm;
the extinction barrel wall is located between the extinction diaphragm and the receiving element.
The stray light eliminating device provided by the embodiment comprises an extinction cavity, a receiving lens arranged in the extinction cavity, a receiving element arranged outside the extinction cavity, an extinction diaphragm arranged in the extinction cavity and an extinction cylinder wall; the receiving lens, the receiving element and the extinction cylinder wall are positioned on the same optical axis; the extinction diaphragm is positioned in the focal region of the receiving lens, and a light through hole is formed in the axis position of the extinction diaphragm; the extinction barrel wall is located between the extinction diaphragm and the receiving element. The signal light beam is scattered to the extinction diaphragm through the receiving lens and then scattered to the extinction cylinder wall through the light through hole, the signal light beam is firstly eliminated once through the extinction cavity, then part of stray light is reflected through the extinction diaphragm, and finally the residual stray light is led out through the extinction cylinder wall; through the device of the embodiment, the stray light eliminating effect is better, and the received signal beam is better.
In one embodiment, a side of the extinction diaphragm facing the receiving lens is of a diamond structure.
In one embodiment, the surface angle of the diamond-shaped structures is 90 °.
In the above embodiment, one surface of the extinction diaphragm facing the receiving lens is set to be in a diamond structure, and the surface angle of the diamond structure is 90 °, so that a light beam with a light divergence angle larger than the receiving field angle of the receiving lens can be reflected to the extinction cavity for absorption, and further a part of stray light with a large light divergence angle is eliminated.
In one embodiment, the extinction barrel wall is provided with a plurality of polygonal through holes.
In one embodiment, the polygonal through hole has a trapezoidal structure.
In one embodiment, the aperture of the polygonal through hole is larger the closer the polygonal through hole is to the optical axis.
In this embodiment, the extinction cylinder wall is in a trapezoidal shape which is vertically symmetrical by taking the optical axis as a central line, and a plurality of polygonal through holes are formed in the extinction cylinder wall, and the aperture of the polygonal through hole is larger as the polygonal through hole is closer to the optical axis; the extinction cylinder wall has light conductivity according to the structural characteristics, disordered light rays are led out of the extinction cylinder wall to the extinction cavity to be absorbed, and then the residual part of stray light is eliminated, so that the received signal light beam is better.
In one embodiment, the bore diameter of the matt cylinder wall is larger than the outer diameter of the receiving element.
In one embodiment, the difference between the aperture of the extinction cylinder wall and the outer diameter of the receiving element is smaller than a preset threshold value.
In this embodiment, the aperture of the extinction cylinder wall is larger than the outer diameter of the receiving element, so that the guided stray light is scattered into the extinction cavity, and if the aperture of the extinction cylinder wall is smaller than the outer diameter of the receiving element, the stray light is guided into the receiving element.
In one embodiment, the inner surface of the extinction cavity is an anodized black surface.
In one embodiment, the receiving lens is any one of a plano-convex lens, a biconvex lens, a spherical lens, an aspherical lens, a free-form lens, and a lens group.
In this embodiment, the inner surface of the extinction cavity is a surface treated by anodic black oxide, and can absorb stray light according to the material characteristics thereof.
The utility model provides a stray light eliminating device, which comprises an extinction cavity, a receiving lens arranged in the extinction cavity, a receiving element arranged outside the extinction cavity, an extinction diaphragm arranged in the extinction cavity and an extinction cylinder wall; the receiving lens, the receiving element and the extinction cylinder wall are positioned on the same optical axis; the extinction diaphragm is positioned in the focal region of the receiving lens, and a light through hole is formed in the axis position of the extinction diaphragm; the extinction barrel wall is located between the extinction diaphragm and the receiving element. In the embodiment, the signal light beam is scattered to the extinction diaphragm through the receiving lens and then scattered to the extinction cylinder wall through the light through hole; the signal light beam is firstly eliminated once through the extinction cavity, then a part of stray light is reflected through the extinction diaphragm, and finally the residual stray light is led out through the extinction cylinder wall; through the device of the embodiment, the stray light eliminating effect is better, and the received signal beam is better.
Drawings
Fig. 1 is a schematic view of a stray light elimination apparatus according to an embodiment of the present application;
fig. 2 is a schematic diagram illustrating an operation of a stray light elimination apparatus according to an embodiment of the present application;
fig. 3 is a cross-sectional view of a dull cylindrical wall according to an embodiment of the present disclosure.
Description of reference numerals:
1: an extinction cavity;
2: a receiving lens;
3: a receiving element;
4: an extinction diaphragm;
5: a delustering cylinder wall;
41: a light through hole;
51: and a polygonal through hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Fig. 1 is a schematic view of a stray light elimination apparatus according to an embodiment of the present application, as shown in fig. 1, the stray light elimination apparatus includes: the device comprises an extinction cavity 1, a receiving lens 2 arranged in the extinction cavity, a receiving element 3 arranged outside the extinction cavity, an extinction diaphragm 4 arranged in the extinction cavity and an extinction cylinder wall 5; the receiving lens 2, the receiving element 3 and the extinction cylinder wall 5 are positioned on the same optical axis; the extinction diaphragm 4 is positioned in the focal region of the receiving lens 2, and the extinction diaphragm 4 is provided with a light through hole 41 at the axis position; the extinction cylinder wall 5 is located between the extinction diaphragm 4 and the receiving element 3.
The extinction cavity 1 is used for absorbing stray light and fixing the receiving lens 2, and the receiving lens 2 is arranged at the front end of the extinction cavity 1 and plays a role of converging light; alternatively, the receiving lens 2 may be a biconvex lens, a plano-convex lens, or a meniscus lens, and the embodiment is not limited. The receiving element 3 is arranged outside the extinction cavity 1 and behind the focal length of the receiving lens 2; the receiving element 3 is a sensitive photoelectric sensor element, and may be a photo transistor, a photo resistor, a photo diode, or a photo transistor, which is not limited in this embodiment. The extinction diaphragm 4 and the extinction barrel wall 5 are both arranged in the extinction cavity 1, the extinction diaphragm 4 is positioned in the focal region of the receiving lens 2, and the extinction diaphragm 4 is provided with a light through hole 41 at the axis position; the extinction diaphragm 4 does not limit the signal beam in the optical system, but only partially limits the light energy incident from outside the field of view, stray light reflected and scattered inside the lens, and the like. An extinction cylinder wall 5 is positioned between the extinction diaphragm 4 and the receiving element 3; the receiving lens 2, the receiving element 3 and the extinction cylinder wall 5 are located on the same optical axis.
Fig. 2 is a schematic diagram of the operation of a stray light elimination apparatus, in which the light beam entering the receiving lens 2 includes an effective information light beam and a stray light beam; the stray light beam includes a light beam whose light divergence angle is larger than the receiving field angle of the receiving lens 2, and a light beam which has not been significantly directional, out of order. As shown in fig. 2, the signal light beam enters the extinction cavity 1 through the receiving lens 2, and converges in the focal region of the receiving lens 2, i.e. the light-passing hole 41 region of the extinction diaphragm 4, in this process, the extinction cavity 1 absorbs a part of stray light, and the extinction diaphragm 4 reflects the light beam with the light divergence angle larger than the receiving field angle of the receiving lens 2 to the extinction cavity 1, so as to eliminate the stray light with the light divergence angle larger than the receiving field angle of the receiving lens 2; the signal light beam passes through the light-transmitting hole 41 and enters the extinction cylinder wall 5, the extinction cylinder wall 5 guides out the disordered light beam to the extinction cavity 1, the disordered stray light is eliminated, and finally the high-quality signal light beam is obtained and transmitted to the receiving element 3.
In the stray light eliminating device in the above embodiment, the signal light beam is scattered to the extinction diaphragm through the receiving lens 2, and then scattered to the extinction cylinder wall 5 through the light through hole 41; the signal beam is firstly eliminated once through the extinction cavity 1, then a part of stray light is reflected through the extinction diaphragm 4, and finally the residual stray light is led out through the extinction cylinder wall 5, so that the stray light elimination effect is better, and the signal beam received by the receiving element 3 is better.
In one embodiment, the side of the extinction diaphragm 4 facing the receiving lens 2 is of a diamond structure; optionally, the surface angle of the diamond-shaped structures is 90 °.
In this embodiment, one surface of the extinction diaphragm 4 facing the receiving lens 2 is of a diamond structure; the surface angle of the rhombic structure is 90 degrees, and according to the structural characteristics, the light beam entering from the outside of the field angle and the stray light reflected inside the lens can be limited, for example, the light beam with the light ray divergence angle larger than the receiving field angle of the receiving lens is reflected into the extinction cavity to be absorbed, so that part of the stray light is eliminated.
Fig. 3 is a cross-sectional view of an extinction cylinder wall according to an embodiment of the present disclosure, optionally, in an embodiment, a plurality of polygonal through holes 51 are formed on the extinction cylinder wall 5; the polygonal through hole 51 is in a trapezoidal structure; the closer the polygonal through hole 51 is to the optical axis, the larger the aperture of the polygonal through hole 51 is.
In the above embodiment, the extinction cylinder wall 5 is cylindrical, a plurality of polygonal through holes 51 with different sizes are formed on the extinction cylinder wall 5, the aperture of the polygonal through hole 51 near the optical axis is larger, and the aperture far away from the optical axis is smaller, and the polygonal through hole is in a trapezoidal structure; the closer the polygonal through-hole 51 is to the optical axis, the larger the aperture of the polygonal through-hole 51. According to the structural characteristics, when the signal light beam passes through the extinction barrel wall 5, disordered light rays are emitted out of the polygonal through hole 51 of the extinction barrel wall 5, and due to the fact that the polygonal through hole 51 is of the trapezoidal structure, the light rays are difficult to reflect back to the interior of the extinction barrel wall 5 from one end with a larger caliber and then from one end with a smaller caliber, the influence of stray light on the signal light beam is eliminated, and the signal light beam is enabled to be better.
In particular, as shown in fig. 1, the bore diameter of the matting cylinder wall 5 is greater than the outer diameter of the receiving element 3; the difference between the aperture of the extinction cylinder wall 5 and the outer diameter of the receiving element 3 is smaller than a preset threshold value.
In this embodiment, the aperture of the extinction cylinder wall 5 is larger than the outer diameter of the receiving element 3, so that stray light guided out from the extinction cylinder wall 5 is scattered into the extinction cavity 1, and if the aperture of the extinction cylinder wall 5 is smaller than the outer diameter of the receiving element 3, the stray light is guided into the receiving element 3, which affects signal quality. A threshold value may be preset to control the size of the aperture of the extinction cylinder wall 5. For example, if the threshold value is set to 2cm, the difference between the bore diameter of the extinction cylinder wall 5 and the outer diameter of the receiving element 3 is less than 2cm, and the size of the bore diameter of the extinction cylinder wall 5 can be determined.
In one embodiment, the inner surface of the extinction cavity 1 is the surface after anodic black treatment.
In this embodiment, the inner surface of the extinction cavity 1 is subjected to anodic black oxidation treatment, so that a part of stray light can be absorbed, the signal beam enters the extinction cavity 1 through the receiving lens 1, and the stray light of the signal beam is eliminated by the inner surface of the extinction cavity 1 for the first time.
In one embodiment, the receiving lens 2 is optionally any one of a plano-convex lens, a biconvex lens, a spherical lens, an aspherical lens, a free-form lens, and a lens group.
In the present embodiment, the receiving lens 2 may be any one of convex lenses for focusing, such as a plano-convex lens, a biconvex lens, a spherical lens, an aspheric lens, a free-form surface lens, or a convex lens group, a biconvex lens group, a spherical lens group, an aspheric lens group, a free-form surface lens group, etc.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
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 (10)
1. A stray light elimination apparatus comprising: the device is characterized by also comprising an extinction diaphragm and an extinction cylinder wall which are arranged in the extinction cavity; the receiving lens, the receiving element and the extinction cylinder wall are positioned on the same optical axis;
the extinction diaphragm is positioned in the focal region of the receiving lens, and a light through hole is formed in the axis position of the extinction diaphragm;
the extinction barrel wall is located between the extinction diaphragm and the receiving element.
2. A stray light elimination device as set forth in claim 1, wherein a side of said extinction diaphragm facing said receiving lens is of a diamond configuration.
3. A stray light elimination device as claimed in claim 2, wherein the surface angle of the diamond-shaped structure is 90 °.
4. A stray light elimination device according to any one of claims 1 to 3, wherein the extinction cylinder wall is provided with a plurality of polygonal through holes.
5. The stray light elimination device of claim 4, wherein the polygonal through hole is in a trapezoidal structure.
6. A stray light elimination device according to claim 5, wherein the aperture of the polygonal through hole is larger the closer the polygonal through hole is to the optical axis.
7. A stray light elimination device according to any one of claims 1 to 3, wherein an aperture of said light extinction cylinder wall is larger than an outer diameter of said receiving member.
8. A stray light elimination device according to claim 7, wherein the difference between the aperture of the extinction cylinder wall and the outer diameter of the receiving element is smaller than a preset threshold value.
9. A stray light elimination device according to any one of claims 1 to 3, wherein the inner surface of the extinction cavity is an anodized black surface.
10. A stray light elimination device according to any one of claims 1 to 3, wherein said receiving lens is any one of a plano-convex lens, a biconvex lens, a spherical lens, an aspherical lens, a free-form lens, and a lens group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821907155.3U CN209979837U (en) | 2018-11-19 | 2018-11-19 | Stray light eliminating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821907155.3U CN209979837U (en) | 2018-11-19 | 2018-11-19 | Stray light eliminating device |
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| Publication Number | Publication Date |
|---|---|
| CN209979837U true CN209979837U (en) | 2020-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821907155.3U Active CN209979837U (en) | 2018-11-19 | 2018-11-19 | Stray light eliminating device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109459739A (en) * | 2018-11-19 | 2019-03-12 | 深圳市速腾聚创科技有限公司 | Stray light cancellation element |
| CN113376845A (en) * | 2021-06-21 | 2021-09-10 | 中国工程物理研究院激光聚变研究中心 | Stray light absorbing device |
-
2018
- 2018-11-19 CN CN201821907155.3U patent/CN209979837U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109459739A (en) * | 2018-11-19 | 2019-03-12 | 深圳市速腾聚创科技有限公司 | Stray light cancellation element |
| CN109459739B (en) * | 2018-11-19 | 2024-02-27 | 深圳市速腾聚创科技有限公司 | Stray light eliminating device |
| CN113376845A (en) * | 2021-06-21 | 2021-09-10 | 中国工程物理研究院激光聚变研究中心 | Stray light absorbing device |
| CN113376845B (en) * | 2021-06-21 | 2022-03-18 | 中国工程物理研究院激光聚变研究中心 | Stray light absorbing device |
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