CN115825917B - Optical receiving device and optical sensing device - Google Patents
Optical receiving device and optical sensing device Download PDFInfo
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- CN115825917B CN115825917B CN202111479452.9A CN202111479452A CN115825917B CN 115825917 B CN115825917 B CN 115825917B CN 202111479452 A CN202111479452 A CN 202111479452A CN 115825917 B CN115825917 B CN 115825917B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 189
- 238000001514 detection method Methods 0.000 claims abstract description 82
- 238000002310 reflectometry Methods 0.000 claims abstract description 19
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/08—Mirrors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4816—Constructional features, e.g. arrangements of optical elements of receivers alone
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The application discloses an optical receiving device and an optical sensing device, wherein the optical receiving device comprises a lens component, a reflecting piece and a photosensitive piece; the reflecting piece is provided with a reflecting surface, and the reflecting surface is used for reflecting the light passing through the lens component; the photosensitive member is provided with a photosensitive surface, and the photosensitive surface is used for receiving the light reflected by the reflecting surface; the reflecting surface comprises a first part and a second part, and the reflectivity of the first part is larger than that of the second part; the distance between the first preset position of the first part and the optical axis of the lens component along the first preset direction is a1, the length of the first preset position of the first part along the second preset direction is b1, the distance between the second preset position of the first part and the optical axis of the lens component along the first preset direction is a2, the length of the second preset position of the first part along the second preset direction is b2, a1 is larger than a2, and b1 is smaller than b2. The intensity of the detection light signal received by the optical sensing device can be improved, and the detection effect of the optical sensing device is improved.
Description
Technical Field
The present application relates to the field of optical sensing technologies, and in particular, to an optical receiving device and an optical sensing device.
Background
The optical sensing device is a device capable of converting an optical signal into an electrical signal, and generally comprises an optical transmitting device and an optical receiving device, wherein a light source in the optical transmitting device transmits a detection beam to a target object, the optical receiving device receives the detection echo beam reflected by the target object and outputs a corresponding electrical signal, and a control part in the optical sensing device processes the electrical signal to obtain parameters such as distance, azimuth, height, speed, gesture and shape of the target object, so that a detection function is realized.
However, when the distance between the target object is measured, the detection echo beam reflected by the target object needs to be transmitted to the photosensitive member after being processed by the lens assembly in the optical receiving device, so as to meet the requirement of long-distance detection of the system, when the distance between the target object is relatively close, the detection echo beam can deviate when passing through the lens assembly, so that a large amount of detection echo beams are not detected and received by the optical sensor, and the intensity of the detection light signal received by the optical sensing device is relatively weak.
Disclosure of Invention
The application provides an optical receiving device and an optical sensing device, which can solve the problem that the intensity of a detection light signal received by the optical sensing device is weaker.
In a first aspect, the present application provides an optical receiving apparatus comprising:
a lens assembly comprising at least one lens;
a reflecting member located on a transmission path of light passing through the mirror assembly, the reflecting member having a reflecting surface for reflecting the light passing through the mirror assembly;
the photosensitive member is provided with a photosensitive surface and is used for receiving the light reflected by the reflecting surface;
the reflecting surface comprises a first part and a second part, wherein the second part is arranged along the outer boundary of the first part, and the reflectivity of the first part is larger than that of the second part;
the distance between the first preset position of the first part and the optical axis of the lens assembly along the first preset direction is a1, the length of the first preset position of the first part along the second preset direction is b1, the distance between the second preset position of the first part and the optical axis of the lens assembly along the first preset direction is a2, the length of the second preset position of the first part along the second preset direction is b2, the second preset position is positioned on one side, close to the optical axis of the lens assembly, of the first preset position, a1 is larger than a2, b1 is smaller than b2, and the first preset direction, the second preset direction and the optical axis of the lens assembly are mutually perpendicular.
In some embodiments of the present application, the first portion includes a plurality of split bodies arranged along the second preset direction, and a sum of lengths of all the split bodies along the second preset direction is b1 at a first preset position of the first portion; at a second preset position of the first part, the sum of the lengths of all the split bodies along the second preset direction is b2. The first parts are arranged to be a plurality of split bodies which are distributed along the second preset direction, gaps between adjacent split bodies are filled by the second parts with lower reflectivity, poor uniformity of detection echo beams received by the photosensitive parts due to concentration of areas with high reflectivity on the reflecting surface can be prevented, uniformity of detection light signals received by the optical sensing device can be effectively improved, and accordingly detection effects of the optical sensing device are improved.
In some embodiments of the present application, the number of the split bodies is n, a length of each split body along the second preset direction is b1/n at a first preset position of the first portion, and a length of each split body along the second preset direction is b2/n at a second preset position of the first portion. And the lengths of all the split bodies along the second preset direction are the same at all positions of the first split part, so that the detection echo light beams received by the photosensitive part are more uniform, and the detection effect of the optical sensing device can be improved.
In some embodiments of the present application, at a first preset position of the first portion, a distance between two adjacent split bodies along the second preset direction is c1; at a second preset position of the first part, the distance between two adjacent split bodies along the second preset direction is c2. At each position of the first subsection, the distances between any two adjacent splits along the second preset direction are the same, so that the detection echo light beams received by the photosensitive pieces are more uniform, and the detection effect of the optical sensing device can be improved.
In some embodiments of the application, the reflective surface has an intersection point intersecting the optical axis of the lens assembly, the intersection point being located at the first portion. The detection echo light beam reflected by the target object far away from the lens component can still fall on the first part, and the remote detection effect of the optical sensing device is improved.
In some embodiments of the application, the first portion is a continuous extension structure extending toward the intersection point. It is possible to ensure that the distribution of the first portion has a gradual trend of continuity, so that the reflection surface has a characteristic of gradual reflectance of continuity.
In some embodiments of the present application, the reflecting surface is a concave curved surface. Compared with a concave reflecting structure formed by a plurality of planes, the concave reflecting structure formed by the plurality of planes generally has a plurality of light focusing focuses, and the concave reflecting structure formed by the smooth curved surface can take the light sensing surface of the light sensing piece as one focus of the concave reflecting structure, so that detection echo light beams reflected from a plurality of positions are reflected to the light sensing surface after being reflected by the reflecting surface, the intensity of detection light signals received by the optical sensing device at all positions within a preset distance range can be improved, and the detection effect of the optical sensing device is improved.
In some embodiments of the present application, the reflecting surface has a first focal point and a second focal point, the light passing through the first focal point and transmitted to the reflecting surface is reflected by the reflecting surface and then gathered at the second focal point, the first focal point coincides with the center of the exit pupil of the lens assembly, and the second focal point is located on the photosensitive surface of the photosensitive member. The first focus of the reflecting surface is overlapped with the center of the exit pupil of the lens assembly, and the second focus can be positioned on the photosensitive surface of the photosensitive member, so that the detection echo light beam reflected from the target object can be focused on the photosensitive surface after passing through the lens assembly and being reflected by the reflecting surface, and the intensity of the detection light signal received by the optical sensing device can be further improved.
In some embodiments of the application, the second focal point of the reflective surface is located at the center of the photosurface. The second focus of the reflecting surface is overlapped with the center of the light sensing surface, so that more light is transmitted to the light sensing surface on the basis of not changing the area of the light sensing surface, and the intensity of a detection light signal received by the optical sensing device is improved.
In a second aspect, the present application also provides an optical sensing device comprising an optical transmitting device and an optical receiving device as described in any of the embodiments above; the optical transmitting device is used for transmitting the detection light beam to the target object, and the optical receiving device is used for receiving the detection echo light beam reflected by the target object.
The beneficial effects of the application are as follows: the detection echo light beam reflected by the target object passes through the lens assembly and then is reflected by the reflecting surface of the reflecting piece, the reflecting piece can change the transmission direction of light, so that the light is concentrated to the photosensitive surface of the photosensitive piece for transmission, even if the detection echo light beam reflected by the target object within the preset distance range deviates when passing through the lens assembly, most of the detection echo light beam can still be detected and received by the photosensitive piece by utilizing the reflection effect of the reflecting piece, thereby improving the intensity of detection light signals received by the optical sensing device, improving the detection effect of the optical sensing device, and simultaneously enabling the first part to be distributed according to the gradual change trend by controlling the area size and the extending direction of the first part in the reflecting surface, so that the reflecting surface has the characteristic of gradual change reflectivity, and the intensity of the detection light signals received by the optical sensing device can be effectively adjusted, thereby being beneficial to improving the short-distance detection effect and long-distance detection effect of the optical sensing device. In addition, the optical sensing device adopts the optical receiving device in the foregoing embodiment, so that the optical sensing device also has the features and advantages of the optical receiving device, which are not described in detail herein.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the related art, the drawings that are required to be used in the embodiments or the related technical descriptions will be briefly described, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
FIG. 1 is a schematic diagram of an optical path structure of an optical receiving device according to an embodiment of the application;
FIG. 2 is a schematic diagram of a reflective surface according to an embodiment of the application;
FIG. 3 is a schematic diagram illustrating an optical path structure of an optical receiving device according to an embodiment of the application;
FIG. 4 is a schematic diagram of an optical path structure of an optical receiving device according to an embodiment of the application;
FIG. 5 is a schematic diagram of an optical path structure of an optical receiving device according to an embodiment of the application;
FIG. 6 is a schematic diagram illustrating an optical path structure of an optical receiving device according to an embodiment of the application;
fig. 7 is a schematic perspective view of an optical sensor device according to an embodiment of the application.
Reference numerals:
10. an optical receiving device; 11. a lens assembly; 111. a lens; 12. a reflecting member; 121. a reflecting surface; 1211. a first portion; 1211a, split; 1212. a second portion; 13. a photosensitive member; 131. a light-sensitive surface; 14. a frame body; 21. a base; 22. a rotation driving device; 23. a cover plate; 24. a protective cover; 25. an external interface; 30. an optical emission device.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
When the optical sensing device is used for measuring the distance of the target object, the detection echo light beams reflected by the target object need to be transmitted to the photosensitive member after being processed by the lens component in the optical receiving device, and compared with the detection echo light beams reflected by the target object with a smaller distance from the optical sensing device, the detection echo light beams can deviate when passing through the lens component, so that a large amount of detection echo light beams are not detected and received by the optical sensor, and the intensity of detection light signals received by the optical sensing device is weaker.
The application provides an optical receiving device and an optical sensing device, which can improve the intensity of a detection light signal received by the optical sensing device and improve the detection effect of the optical sensing device.
As shown in fig. 1 and 2, the present application provides an optical receiving device 10, where the optical receiving device 10 can receive a probe echo beam reflected by a target object and output a corresponding electrical signal. The optical receiving device 10 includes a lens assembly 11, a reflecting member 12, and a photosensitive member 13.
The lens assembly 11 includes at least one lens 111, where the lens 111 is made of an optically transparent material such as glass or resin, and the lens 111 has one or more curved surfaces, which can change the transmission direction of light, control the distribution of light to concentrate the light and finally image. The lens 111 may be classified into a convex lens and a concave lens according to the shape and function thereof, and the material, type, size, etc. of the lens 111 are not limited in the present application. The number of lenses 111 in the lens assembly 11 is at least one, and in order to provide the lens assembly 11 with a plurality of different optical properties, the number of lenses 111 is generally set to be plural, the plural lenses 111 may be stacked together to form the lens of the optical receiving device 10, the optical axes O of the plural lenses 111 may be coincident, the optical axes O may be a line passing through the center of the lenses 111, and the plural lenses 111 may be the same or different, which is not limited in this embodiment.
The reflecting member 12 is positioned on a transmission path of the light passing through the mirror assembly 11, and the reflecting member 12 has a reflecting surface 121, and the reflecting surface 121 is used for reflecting the light passing through the mirror assembly 11. It will be appreciated that the probe echo beam reflected from the target object having a distance within the predetermined distance range from the optical sensing device is reflected by the reflecting surface 121 of the reflecting member 12 after passing through the lens assembly 11, and the light transmission path can be changed by the reflecting member 12 so that the light passing through the lens assembly 11 is transmitted to the photosensitive member 13. The reflecting surface 121 is a smooth mirror surface having a mirror reflection function, and the reflecting surface 121 may be formed on the reflecting member 12 by polishing or the like, or the reflecting surface 121 may be formed by coating or attaching a reflecting layer on the reflecting member 12. The material of the reflecting member 12 may be selected according to the actual situation, and the present application is not particularly limited. The size of the reflecting surface 121 may be selected according to practical requirements, and the present application is not particularly limited.
The photosensitive member 13 has a photosensitive surface 131, the photosensitive surface 131 is used for receiving the light reflected by the reflecting surface 121, the photosensitive member 13 can receive the light reflected by the reflecting member 12, convert the light signal into an electrical signal and transmit the electrical signal to a control part in the optical sensing device, and the control part in the optical sensing device can obtain parameters such as distance, azimuth, height, speed, posture and shape of the target object after processing the electrical signal. The photosensitive member 13 may be an optical sensor, and a specific working principle of the optical sensor is disclosed in the related art, which is not described in detail in the embodiment of the present application. The type and the kind of the optical sensor can be selected according to actual requirements. The shape of the photosensitive surface 131 may be a circular shape, an elliptical shape, a square shape, a triangular shape, or the like, and the present application is not particularly limited.
It should be noted that, after the probe echo beam reflected by the target object passes through the lens assembly 11 and is reflected by the reflecting surface 121 of the reflecting member 12, the reflecting member 12 can change the transmission direction of the light, so that the light is concentrated and transmitted to the light sensing surface 131 of the light sensing member 13, and even if the probe echo beam reflected by the target object located within the preset distance range deviates when passing through the lens assembly 11, most of the probe echo beam can still be detected and received by the light sensing member 13 by utilizing the reflection effect of the reflecting member 12, thereby improving the intensity of the probe light signal received by the optical sensing device and improving the detection effect of the optical sensing device.
With continued reference to fig. 1 and 2, the reflective surface 121 includes a first portion 1211 and a second portion 1212, the second portion 1212 being disposed along an outer boundary of the first portion 1211, the first portion 1211 having a reflectivity greater than the second portion 1212. The first portion 1211 is a region with higher reflectivity on the reflective surface 121, the second portion 1212 is a region with lower reflectivity on the reflective surface 121, the first portion 1211 may be a white reflective surface 121, the second portion 1212 may be a black reflective surface 121, the materials for preparing the first portion 1211 and the second portion 1212 may be selected according to actual requirements, and on the basis of ensuring that the reflective surface 121 has good reflectivity, it is sufficient that the reflectivity of the first portion 1211 is greater than that of the second portion 1212.
Specifically, the distance between the first preset position Q1 of the first portion 1211 and the optical axis O of the lens assembly 11 along the first preset direction AA is a1, the length of the first preset position Q1 of the first portion 1211 along the second preset direction BB is b1, the distance between the second preset position Q2 of the first portion 1211 and the optical axis O of the lens assembly 11 along the first preset direction AA is a2, the length of the second preset position Q2 of the first portion 1211 along the second preset direction BB is b2, and the second preset position Q2 is located on one side of the first preset position Q1 close to the optical axis O of the lens assembly 11.
Wherein a1 is greater than a2, b1 is less than b2, and the first preset direction AA, the second preset direction BB, and the optical axis O of the lens assembly 11 are disposed perpendicular to each other. It should be noted that the first preset position Q1 and the second preset position Q2 may be any positions on the first portion 1211.
It will be appreciated that, in the process of transmitting the probe echo beam reflected by the target object to the lens assembly 11, due to the influence of factors such as air, a certain energy loss will be generated in the transmission process of the probe echo beam, so that the intensity of the probe echo beam reflected by the target object farther from the lens assembly 11 is smaller, the intensity of the probe echo beam received by the optical sensing device is also smaller, the intensity of the probe echo beam reflected by the target object nearer to the lens assembly 11 is larger, the intensity of the probe echo beam received by the optical sensing device is also larger, and the excessive or insufficient intensity of the probe echo beam will affect the detection effect of the optical sensing device.
It will be further appreciated that the farther the target object is from the lens assembly 11, the smaller the angle between the probe echo beam reflected by the target object and the optical axis O, i.e. the smaller the distance between the reflection point of the probe echo beam reflected by the target object on the reflection surface 121 and the optical axis O along the first preset direction AA (L1-L4 in fig. 1 are the probe echo beams reflected by the target object from far to near).
In the present application, the smaller the distance between the first portion 1211 and the optical axis O along the first preset direction AA, the larger the length along the second preset direction BB, which makes the first portion 1211 have a characteristic of gradual change in reflection performance, and the first portion 1211 has a larger reflectivity than the second portion 1212, so that the first portion 1211 can be distributed according to the gradual trend by controlling the area size and the extending direction of the first portion 1211 in the reflective surface 121, so that the reflective surface 121 has a characteristic of gradual change in reflectivity, and the intensity of the detection light signal received by the optical sensing device can be effectively adjusted, for example: the reflection of the detection echo beam reflected by the target object far away from the lens assembly 11 on the reflecting surface 121 is strong, the loss of the detection light signal received by the optical sensing device is small, the remote detection effect of the optical sensing device is improved, meanwhile, the reflection of the detection echo beam reflected by the target object near to the lens assembly 11 on the reflecting surface 121 is weak, the loss of the detection light signal received by the optical sensing device is large, the intensity of the detection light signal received by the optical sensing device can be effectively reduced, and the short-distance detection effect of the optical sensing device is improved.
It should be further noted that, there may be only two positions with different reflection properties on the first portion 1211, such as the first preset position Q1 and the second preset position Q2, so that the reflection surface 121 has different reflectivities only at the first preset position Q1 and the second preset position Q2; it is also possible that only a partial region on the first portion 1211 has a characteristic of gradual change in reflection performance, so that the reflection surface 121 has a characteristic of gradual change in reflectance in the partial region; of course, the entirety of the first portions 1211 may also each have a characteristic of gradual reflection performance, such that the reflective surfaces 121 each have a characteristic of gradual reflection at regions corresponding to the first portions 1211.
With continued reference to fig. 1 and 2, in some embodiments of the application, the first portion 1211 includes a plurality of segments 1211a arranged along the second predetermined direction BB, and the sum of the lengths of all segments 1211a along the second predetermined direction BB is b1 at a first predetermined position Q1 of the first portion 1211, and the sum of the lengths of all segments 1211a along the second predetermined direction BB is b2 at a second predetermined position Q2 of the first portion 1211. The specific numerical values of b1 and b2 may be selected according to actual requirements, and the present application is not limited in particular.
It can be understood that when the first portion 1211 includes the plurality of split units 1211a, the length of the first portion 1211 along the second preset direction BB at the first preset position Q1 refers to the sum of the lengths of all the split units 1211a along the second preset direction BB at the first preset position Q1, and the length of the first portion 1211 along the second preset direction BB at the second preset position Q2 refers to the sum of the lengths of all the split units 1211a along the second preset direction BB at the second preset position Q2; the first portion 1211 is configured as the plurality of split units 1211a arranged along the second preset direction BB, and gaps between adjacent split units 1211a are filled with the second portion 1212 with lower reflectivity, so that poor uniformity of the detection echo light beam received by the photosensitive member 13 due to concentration of the area with high reflectivity on the reflecting surface 121 can be prevented, and uniformity of the detection light signal received by the optical sensing device can be effectively improved.
It should be noted that, in fig. 2, only a case where the plurality of split units 1211a are finally connected to form an integral structure is illustrated, and the plurality of split units 1211a may be disposed at intervals according to actual requirements, however, only one split unit 1211a may be disposed according to actual requirements; it should be further understood that fig. 1 only illustrates the case that the overall shape of the split 1211a is trapezoidal, and the overall shape of the split 1211a may be triangular, arc-shaped or other shapes according to practical needs, which is not limited by the present application.
With continued reference to fig. 1 and 2, in an embodiment of the present application, the number of the split units 1211a is n, the length of each split unit 1211a along the second preset direction BB is b1/n at the first preset position Q1 of the first portion 1211, the length of each split unit 1211a along the second preset direction BB is b2/n at the second preset position Q2 of the first portion 1211, that is, the length of all split units 1211a along the second preset direction BB is the same at the first preset position Q1 of the first portion 1211, and the length of each split unit 1211a along the second preset direction BB is b1/n, and the length of all split units 1211a along the second preset direction BB is the same at the second preset position Q2 of the first portion 1211, and the length of each split unit 1211a along the second preset direction BB is b2/n, so that the detected echo beam 13 is more uniformly received. The specific numerical value of n can be selected according to actual requirements, and the application is not particularly limited.
Wherein, at the first preset position Q1 of the first portion 1211, the pitches of the adjacent two split units 1211a along the second preset direction BB may be c1; at the second preset position Q2 of the first portion 1211, the pitches of the two adjacent split units 1211a along the second preset direction BB may be c2, that is, at the first preset position Q1 of the first portion 1211, the pitches of any two adjacent split units 1211a along the second preset direction BB may be the same, and at the second preset position Q2 of the first portion 1211, the pitches of any two adjacent split units 1211a along the second preset direction BB may be the same, so that the detection echo light beams received by the photosensitive member 13 are more uniform. The specific numerical values of c1 and c2 may be selected according to actual requirements, and the present application is not limited specifically.
It should be noted that, a plurality of photosensitive members 13 may be disposed, where the plurality of photosensitive members 13 are arranged along the second preset direction BB, and the split 1211a corresponds to the photosensitive members 13 one by one, that is, the probe echo beam reflected by one split 1211a is received by the corresponding photosensitive member 13, and the interval between two adjacent split 1211a along the second preset direction BB is related to the interval between two adjacent photosensitive members 13 along the second preset direction BB, and when the photosensitive members 13 are uniformly arranged, at the first preset position Q1 of the first portion 1211, the interval between any two adjacent split 1211a along the second preset direction BB is equal. When the photosensitive members 13 are unevenly arranged, at the first predetermined position Q1 of the first portion 1211, the adjacent two split bodies 1211a are not equally spaced in the second predetermined direction BB.
In one embodiment of the present application, the reflective surface 121 has an intersection point P intersecting the optical axis O of the lens assembly 11, and the intersection point P is located at the first portion 1211.
It can be understood that, the greater the energy loss in the process of transmitting the probe echo beam reflected from the object far from the lens assembly 11 to the lens assembly 11, and the closer the reflection point on the reflecting surface 121 is to the intersection point P, the more closely the intersection point P is located on the first portion 1211 in the embodiment of the present application, so that it can be ensured that the probe echo beam reflected from the object far from the lens assembly 11 still falls on the first portion 1211, which is beneficial to enhancing the remote detection effect of the optical sensing device.
Further, the intersection point P may be located at the center of the boundary of the first portion 1211.
With continued reference to fig. 1 and 2, the first portion 1211 may be a continuous extension structure extending toward the intersection point P. Note that the continuously extending structure means that the first portion 1211 is a continuously uninterrupted structure in a direction extending toward the intersection point P, so as to ensure that the distribution of the first portion 1211 has a continuous gradient trend, so that the reflective surface 121 has a continuous gradient reflectivity characteristic.
With continued reference to fig. 1 and 2, in some embodiments of the application, the reflective surface 121 may be concave. It can be understood that the concave reflecting structure has a light condensing function, after the divergent light is directed to the concave reflecting surface 121, the reflection effect of the reflecting surface 121 can make the detection echo beam reflected by the reflecting surface 121 to be condensed, so that the light reflected by the reflecting surface 121 can be condensed on the light sensing surface 131 of the light sensing member 13, and most of the detection echo beam reflected by the target object within the preset distance range is detected and received by the light sensing member 13.
The reflecting surface 121 may be formed by a plurality of reflecting planes, and the reflecting planes are sequentially connected to form a concave reflecting structure, and it is understood that the reflecting positions of the probe echo beams reflected by the target objects with different distances from the lens assembly 11 on the reflecting surface 121 are different.
Of course, as shown in fig. 3 and 4, the reflecting surface 121 may be a concave curved surface, and the reflecting surface 121 may be an arc surface or an elliptical arc surface. It can be understood that, compared to a concave reflecting structure formed by a plurality of reflecting planes, the concave reflecting structure formed by a plurality of reflecting planes generally has a plurality of focusing focuses, and the concave reflecting structure formed by a smooth curved surface can use the light sensing surface 131 of the light sensing member 13 as one focus of the concave reflecting structure, so that the detection echo light beams reflected from a plurality of positions are reflected to the light sensing surface 131 after being reflected by the reflecting surface 121, and the intensity of the detection light signals received by the optical sensing device at each position within a preset distance range can be improved, thereby improving the detection effect of the optical sensing device.
As shown in fig. 3, the reflecting surface 121 may be formed of a concave curved surface. Of course, as shown in fig. 4, the reflecting surface 121 may also be formed by a plurality of concave curved surfaces. When the reflecting surface 121 is formed by a plurality of concave curved surfaces, the concave curved surfaces may be connected to each other or disposed at intervals, and each concave curved surface may correspondingly perform optical path adjustment on the probe echo beam reflected back by the target object within a certain distance range, so that the probe echo beam reflected back by the target object within a distance range corresponding to the reflecting plane is incident on the photosensitive surface 131.
It should be noted that, as shown in fig. 4, when the plurality of concave curved surfaces are arranged at intervals, the gaps between the adjacent concave curved surfaces can also play a role in reducing the partial reflectivity, so that the reflection of the detection echo beam reflected by the target object with a relatively close distance to the lens assembly 11 on the reflecting surface 121 is relatively weak, the intensity of the detection light signal received by the optical sensing device can be effectively reduced, and the close-range detection effect of the optical sensing device is facilitated to be improved.
It should be further noted that, in the embodiment of the present application, the concave reflection structure is combined with the gradual reflectivity characteristic of the reflection surface 121, so that the intensity of the probe echo beam reflected by the target object having a relatively close distance to the lens assembly 11 can be effectively increased, and the intensity of the probe light signal received by the optical sensing device when the target object having a relatively close distance to the lens assembly 11 is detected can be effectively reduced, which is beneficial to improving the close-range detection effect of the optical sensing device.
It should be further noted that, when the probe echo beam reflected by the target object far from the lens assembly 11 passes through the lens assembly 11, the offset is very small, so that only the probe echo beam reflected by the target object located within the preset distance range can be condensed, so as to improve the intensity of the probe light signal received by the optical sensing device.
Therefore, the length of the reflecting surface 121 is related to the preset distance range that the optical sensing device needs to detect, the detected echo beam reflected by the target object located within the preset distance range needs to be concentrated by the reflecting member 12, in general, the greater the preset distance range that the optical sensing device needs to detect, the greater the length of the reflecting surface 121, for example, the optical sensing device only needs to detect the target object beyond 20, where the preset distance range is 20 meters to 50 meters, the length of the reflecting surface 121 is 8 centimeters, and when the preset distance range is 20 meters to 80 meters, the length of the reflecting surface 121 is 10 centimeters, and the preset distance range that the optical sensing device needs to detect can be selected according to practical needs.
With continued reference to fig. 3, the reflecting surface 121 has a first focal point F1 and a second focal point F2, and the light transmitted to the reflecting surface 121 through the first focal point F1 is reflected by the reflecting surface 121 and then collected at the second focal point F2, where the first focal point F1 coincides with the exit pupil center of the lens assembly 11, and the second focal point F2 may be located on the photosensitive surface 131 of the photosensitive member 13.
It should be noted that, as known to those skilled in the art, the concave reflecting structure formed by the curved surface necessarily has two focuses, and the light emitted from one focus of the concave reflecting structure is reflected by the concave reflecting structure and then is necessarily collected at the other focus of the concave reflecting structure, and the focus of the light reflected by the concave reflecting structure is the light collecting focus of the concave reflecting structure. For optical systems such as the lens assembly 11, the image formed by the aperture diaphragm of the optical system in the image space of the optical system is called as an "exit pupil" of the optical system, the center of the exit pupil refers to the center of the exit pupil, the light entering the lens assembly 11 can intersect at the center of the exit pupil in the lens assembly 11, the center of the exit pupil is the optical center of the lens assembly 11, and the transmission direction of the light passing through the center of the exit pupil when passing through the lens assembly 11 is not changed.
Therefore, in the embodiment of the present application, the first focal point F1 of the reflecting surface 121 is disposed coincident with the center of the exit pupil of the lens assembly 11, and the second focal point F2 may be located on the photosensitive surface 131 of the photosensitive member 13, so that the probe echo beam reflected from the target object, after passing through the lens assembly 11 and being reflected by the reflecting surface 121, is focused on the photosensitive surface 131, so that the intensity of the probe light signal received by the optical sensing device may be further improved.
With continued reference to fig. 3, the second focal point F2 of the reflective surface 121 may be located at the center of the photosurface 131. It can be understood that, during the process of transmitting the light reflected by the reflecting surface 121 to the second focal point F2 of the reflecting surface 121, due to the influence of factors such as air medium, a part of the light is deflected, so that a part of the light is scattered near the second focal point F2, and the second focal point F2 of the reflecting surface 121 is overlapped with the center of the photosensitive surface 131, so that more light can be transmitted to the photosensitive surface 131 without changing the area of the photosensitive surface 131.
In another embodiment of the present application, as shown in fig. 5, the reflective surface 121 is planar. It will be appreciated that the light condensing effect of the planar reflective structure is slightly worse than that of the concave reflective structure, but the planar reflective structure is easier to form, so that the production cost of the reflective member 12 can be reduced on the premise of ensuring that the intensity of the detection light signal received by the optical sensing device is sufficient.
It should be noted that, as shown in fig. 5, when the reflecting surface 121 is a plane, only one reflecting member 12 may be provided, and at this time, the transmission direction of the probe echo beam after passing through the lens assembly 11 may be changed by only one reflecting member 12, so that the probe echo beam is concentrated to be transmitted to the photosensitive surface 131 of the photosensitive member 13.
Of course, as shown in fig. 6, when the reflecting surface 121 is a plane, a plurality of reflecting members 12 may be disposed, and by designing the positions of the plurality of reflecting members 12, the plurality of reflecting members 12 cooperate with each other, and the transmission direction of the probe echo beam passing through the lens assembly 11 may be changed multiple times, so that more probe echo beams are concentrated and transmitted to the photosensitive surface 131 of the photosensitive member 13.
As shown in fig. 1 to 6, in an embodiment of the present application, the photosensitive surface 131 of the photosensitive member 13 is disposed parallel to the optical axis O of the lens assembly 11, and the reflecting surface 121 is disposed obliquely with respect to the photosensitive surface 131, so as to facilitate placement of the lens assembly 11, the reflecting member 12 and the photosensitive member 13 in the optical sensing device.
Of course, the positions of the lens assembly 11, the reflective member 12 and the photosensitive member 13 may be selected according to practical needs, for example, the lens assembly 11 and the photosensitive member 13 are located on the same side of the reflective member 12, the reflective surface 121 of the reflective member 12 and the photosensitive surface 131 of the photosensitive member 13 are disposed in parallel, and the optical axis O of the lens assembly 11 is disposed obliquely with respect to the reflective surface 121.
Based on the above-mentioned optical receiving device 10, the present application also provides an optical sensing device, as shown in fig. 7, which includes an optical transmitting device 30 and the optical receiving device 10 according to any of the above-mentioned embodiments.
Wherein the optical transmitting device 30 is used for transmitting the probe beam to the target object, and the optical receiving device 10 is used for receiving the probe echo beam reflected by the target object.
Specifically, the optical emitting device 30 includes a light source, which may emit a probe beam toward the target object, and the light source may be a surface light source, a point light source or a line light source, and the light source may be a laser light source, and of course, the light source may also be other kinds of light sources, such as a high-intensity LED light source, which is not particularly limited in the present application.
Specifically, the optical sensing device may further include a control portion, where the control portion may process the electrical signal, and then may obtain parameters such as a distance, an azimuth, a height, a speed, an attitude, and a shape of the target object, so as to implement a detection function. The control part may be a micro control unit (Microcontroller Unit, MCU).
Taking the optical sensing device as a laser radar applied to a vehicle as an example, a light source in the optical sensing device emits a detection beam to a target object according to an emission signal, an optical receiving device 10 in the optical sensor receives the detection echo beam reflected by the target object and outputs a corresponding electric signal, a control part in the optical sensor processes the electric signal to form a radar point cloud image, and parameters such as distance, azimuth, height, speed, gesture, shape and the like of the target object can be obtained after the radar point cloud image is subjected to data processing, so that the radar detection function is realized. Of course, according to actual demands, the optical sensing device can also realize functions of part diameter detection, surface roughness detection, strain detection, displacement detection, vibration detection, speed detection, distance detection, acceleration detection, shape detection of an object, and the like.
The optical sensing device can also be applied to an environment sensing system of a vehicle, and of course, the optical sensor can also be applied to an environment sensing system of equipment such as an unmanned plane or a robot so as to realize functions such as 3d (3 Dimensions) sensing and environment image sensing. Of course, the optical sensing device can also be applied to an active suspension system of a vehicle, for example, in the active suspension system, the optical sensing device can send corresponding signals to an electric control unit of the vehicle according to the height, the speed, the steering angle, the speed, the braking and the like of the vehicle, and the electric control unit of the vehicle controls an actuating mechanism of the suspension, so that the rigidity of the suspension, the damping force of a shock absorber, the height and other parameters of the vehicle body are changed, and the vehicle has good riding comfort and operation stability. The optical sensing device can also be applied to a light control system, a vehicle speed measuring system, a driving control system and other systems of the vehicle.
With continued reference to fig. 7, in an embodiment of the present application, the optical sensing device further includes a base 21, a rotation driving device 22, a cover 23, a protection cover 24, and an external connection interface 25.
The base 21 has a receiving cavity, the rotary driving device 22 is located in the receiving cavity, the optical receiving device 10 and the optical transmitting device 30 are mounted on the rotary driving device 22, the optical transmitting device 30 and the optical receiving device 10 are arranged side by side, the light outlet of the optical transmitting device 30 and the light inlet of the optical receiving device 10 are located at the same side, the light emitted by the light source is emitted from the light outlet, reflected by the target object and then emitted into the optical receiving device 10 from the light inlet. The rotation driving device 22 may drive the optical receiving device 10 and the optical transmitting device 30 to rotate so as to change the directions of the light source and the lens assembly 11, so that the optical receiving device 10 may better receive the probe echo beam reflected from the target object, and the rotation driving device 22 may be a device that has power such as a motor or a motor and is capable of driving the optical receiving device 10 and the optical transmitting device 30 to rotate.
The optical receiving apparatus 10 further has a frame 14, the cover 23 is covered on the frame 14, and the cover 23 and the frame 14 can enclose to form a closed optical transmission channel, and the probe echo beam reflected from the target object passes through the lens assembly and is transmitted in the optical transmission channel.
The protection cover 24 may be disposed on the base 21, and a protection cavity may be formed between the protection cover 24 and the base 21, where the optical receiving device 10 is accommodated in the protection cavity, so as to protect the optical receiving device 10 by the protection cover 24. The protection cover 24 is detachably connected with the base 21, and the protection cover 24 can be detachably connected through clamping, threaded connection, riveting or plugging and the like.
The external interface 25 may be mounted on the base 21, and the external interface 25 may be electrically connected to the photosensitive member 13, so as to implement signal transmission between the photosensitive member 13 and the control portion through the external interface 25.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application.
Claims (10)
1. An optical receiving apparatus, comprising:
a lens assembly comprising at least one lens;
a reflecting member located on a transmission path of light passing through the mirror assembly, the reflecting member having a reflecting surface for reflecting the light passing through the mirror assembly;
the photosensitive member is provided with a photosensitive surface and is used for receiving the light reflected by the reflecting surface;
the reflecting surface comprises a first part and a second part, wherein the second part is arranged along the outer boundary of the first part, and the reflectivity of the first part is larger than that of the second part;
the distance between the first preset position of the first part and the optical axis of the lens assembly along the first preset direction is a1, the length of the first preset position of the first part along the second preset direction is b1, the distance between the second preset position of the first part and the optical axis of the lens assembly along the first preset direction is a2, the length of the second preset position of the first part along the second preset direction is b2, the second preset position is positioned on one side, close to the optical axis of the lens assembly, of the first preset position, a1 is larger than a2, b1 is smaller than b2, and the first preset direction, the second preset direction and the optical axis of the lens assembly are mutually perpendicular.
2. The optical receiving device according to claim 1, wherein the first portion includes a plurality of split bodies arranged along the second preset direction, and a sum of lengths of all the split bodies along the second preset direction is b1 at a first preset position of the first portion; at a second preset position of the first part, the sum of the lengths of all the split bodies along the second preset direction is b2.
3. The optical receiving device according to claim 2, wherein the number of the split bodies is n, and a length of each of the split bodies in the second preset direction is b1/n at a first preset position of the first portion; at a second preset position of the first part, the length of each split body along the second preset direction is b2/n.
4. The optical receiving device according to claim 2, wherein at a first preset position of the first portion, a distance between two adjacent split bodies along the second preset direction is c1; at a second preset position of the first part, the distance between two adjacent split bodies along the second preset direction is c2.
5. The optical receiving device of claim 2, wherein the reflective surface has an intersection point intersecting the optical axis of the lens assembly, the intersection point being located at the first portion.
6. The optical receiving device of claim 5, wherein the first portion is a continuous extension structure extending toward the intersection point.
7. The optical receiving device according to any one of claims 1 to 6, wherein the reflecting surface is a concave curved surface.
8. The optical receiving device according to claim 7, wherein the reflecting surface has a first focal point and a second focal point, the light passing through the first focal point and transmitted to the reflecting surface is reflected by the reflecting surface and then collected at the second focal point, the first focal point coincides with the center of the exit pupil of the lens assembly, and the second focal point is located on the photosensitive surface of the photosensitive member.
9. The optical receiving device of claim 8, wherein the second focal point of the reflective surface is located at a center of the photosurface.
10. An optical sensing device comprising an optical transmitting device and an optical receiving device according to any one of claims 1 to 9; the optical transmitting device is used for transmitting the detection light beam to the target object, and the optical receiving device is used for receiving the detection echo light beam reflected by the target object.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310854329.3A CN116990781A (en) | 2021-12-03 | 2021-12-03 | Optical receiving device and optical sensing device |
| CN202111479452.9A CN115825917B (en) | 2021-12-03 | 2021-12-03 | Optical receiving device and optical sensing device |
| US18/072,653 US11796385B2 (en) | 2021-12-03 | 2022-11-30 | Optical receiving device and optical sensing device comprising a reflecting surface having a second portion arranged along an outer boundary of a first portion with different reflectivity |
| US18/368,548 US20240003739A1 (en) | 2021-12-03 | 2023-09-14 | Optical receiving device and optical sensing device |
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| CN202111479452.9A CN115825917B (en) | 2021-12-03 | 2021-12-03 | Optical receiving device and optical sensing device |
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| CN202310854329.3A Division CN116990781A (en) | 2021-12-03 | 2021-12-03 | Optical receiving device and optical sensing device |
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| CN116990781A (en) | 2023-11-03 |
| CN115825917A (en) | 2023-03-21 |
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