CN115825917A

CN115825917A - Optical receiving device and optical sensing device

Info

Publication number: CN115825917A
Application number: CN202111479452.9A
Authority: CN
Inventors: 齐志宏; 杨莹
Original assignee: Suteng Innovation Technology Co Ltd
Current assignee: Suteng Innovation Technology Co Ltd
Priority date: 2021-12-03
Filing date: 2021-12-03
Publication date: 2023-03-21
Anticipated expiration: 2041-12-03
Also published as: CN115825917B; CN116990781A

Abstract

The application discloses an optical receiving device and an optical sensing device, wherein the optical receiving device comprises a lens assembly, a reflecting piece and a photosensitive piece; the reflector is provided with a reflecting surface used for reflecting the light passing through the lens assembly; the light sensing piece is provided with a light sensing surface, and the light sensing 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 greater 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, 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

Optical receiving device and optical sensing device

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 a detection echo beam reflected by the target object and outputs a corresponding electrical signal, and a control part in the optical sensing device can obtain parameters such as distance, direction, height, speed, posture and shape of the target object after processing the electrical signal, so that a detection function is realized.

However, when the distance of the target object is measured, the detection echo beam reflected by the target object needs to be processed by a lens assembly in the optical receiving device and then transmitted to the photosensitive member, and in order to meet the requirement of detecting the distance of the system, when the distance of the target object is short, the detection echo beam can shift when passing through the lens assembly, so that a large number 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 weak.

Disclosure of Invention

The application provides an optical receiving device and an optical sensing device, which can solve the problem that the strength of a detection optical signal received by the optical sensing device is weak.

In a first aspect, the present application provides an optical receiving apparatus comprising:

a lens assembly including at least one lens;

a reflector positioned in a transmission path of light passing through the lens assembly, the reflector having a reflective surface for reflecting light passing through the lens assembly;

the light sensing piece is provided with a light sensing surface, and the light sensing surface is used for receiving the light reflected by the reflecting surface;

the reflecting surface comprises a first part and a second part, the second part is arranged along the outer boundary of the first part, and the reflectivity of the first part is greater than that of the second part;

the first preset position department of first part with the optical axis of lens subassembly is a1 along the interval of first direction of predetermineeing, the first preset position department of first part is b1 along the length of second direction of predetermineeing, the second of first part predetermines position department with the optical axis of lens subassembly is a2 along the interval of first direction of predetermineeing, the second of first part predetermines position department and is b2 along the length of second direction of predetermineeing, the second is predetermine the position and is located first predetermined position is close to one side of the optical axis of lens subassembly, a1 is greater than a2, b1 is less than b2, first predetermined direction, the second direction of predetermineeing and the optical axis mutually perpendicular of lens subassembly sets up.

In some embodiments of the present application, the first portion includes a plurality of sub-bodies arranged along the second preset direction, and at a first preset position of the first portion, a sum of lengths of all the sub-bodies along the second preset direction is b1; 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. Set up the first part into a plurality of components of a whole that can function independently that arrange along the second preset direction, the clearance between the adjacent components of a whole that can function independently is filled by the lower second part of reflectivity, can prevent that the region that the reflectivity is high on the plane of reflection from concentrating and leading to the detection echo light beam homogeneity that the sensitization piece received relatively poor, can effectual promotion optical sensing device received the homogeneity of detection light signal to promote optical sensing device's detection effect.

In some embodiments of the present application, the number of the sub-bodies is n, at a first preset position of the first portion, a length of each of the sub-bodies along the second preset direction is b1/n, and at a second preset position of the first portion, a length of each of the sub-bodies along the second preset direction is b2/n. All the components of a whole that can function independently are the same along the length of the second preset direction at each position of the first component of the optical sensing device, so that the detection echo light beam received by the light sensing piece is 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, distances between two adjacent separated bodies along the second preset direction are both 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 the position department everywhere of first subsection, the interval homogeneous phase of two arbitrary adjacent components along the second preset direction to it is more even to make the detection echo light beam that the sensitization piece received, thereby can promote optical sensing device's detection effect.

In some embodiments of the present application, the reflective surface has an intersection point with an optical axis of the lens component, the intersection point being located at the first portion. The detection echo light beam reflected by the target object which is far away from the lens component can still fall on the first part, and the remote detection effect of the optical sensing device is favorably improved.

In some embodiments of the present application, the first portion is a continuously extending structure extending toward the intersection point. The distribution of the first portion can be ensured to have a continuous gradual change trend, so that the reflecting surface has the characteristic of continuous gradual change reflectivity.

In some embodiments of the present application, the reflective 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-gathering 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 the detection echo beams reflected from a plurality of positions are reflected to the light-sensing surface after being reflected by the reflecting surface, the intensity of the detection light signals of each position in the preset distance range received by the optical sensing device can be improved, and the detection effect of the optical sensing device is improved.

In some embodiments of this application, the plane of reflection has first focus and second focus, passes first focus and to the light that the plane of reflection transmitted gathers in after the plane of reflection the second focus, first focus with the coincidence in the exit pupil center of lens subassembly, the second focus is located the photosurface of sensitization piece. The first focus of the reflecting surface is coincided with the center of the exit pupil of the lens assembly, and the second focus can be located on the photosensitive surface of the photosensitive element, so that the detection echo beam reflected from the target object passes through the lens assembly and is reflected by the reflecting surface to be focused on the photosensitive surface, and the intensity of the detection optical signal received by the optical sensing device can be further improved.

In some embodiments of the present application, the second focal point of the reflecting surface is located at the center of the photosensitive surface. The second focus of the reflecting surface is overlapped with the center of the photosensitive surface, so that more light can be transmitted to the photosensitive surface on the basis of not changing the area of the photosensitive 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 emitting device and an optical receiving device as described in any of the above embodiments; the optical transmitting device is used for transmitting a detection light beam to a target object, and the optical receiving device is used for receiving a detection echo light beam reflected by the target object.

The beneficial effect of this application does: 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 transmitted to the photosensitive surface of the photosensitive piece in a centralized manner, even if the detection echo light beam reflected by the target object within the preset distance range passes through the lens assembly and deviates, most of the detection echo light beam can still be detected and received by the photosensitive piece by utilizing the reflection action of the reflecting piece, so that the intensity of the detection light signal received by the optical sensing device can be improved, the detection effect of the optical sensing device is improved, meanwhile, the first part is distributed according to the gradual trend by controlling the area size and the extension direction of the first part in the reflecting surface, the reflecting surface has the characteristic of gradual change reflectivity, the intensity of the detection light signal received by the optical sensing device can be effectively adjusted, and the short-distance detection effect and the long-distance detection effect of the optical sensing device are improved. In addition, the optical sensing device adopts the optical receiving device in the foregoing embodiments, and 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 technical solutions in the embodiments or related technologies of the present application, the drawings needed to be used in the description of the embodiments or related technologies are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic diagram of an optical path structure of an optical receiving device according to an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a reflective surface according to an embodiment of the present disclosure;

fig. 3 is a schematic diagram of an optical path structure of an optical receiving device according to an embodiment of the present disclosure;

fig. 4 is a schematic diagram of an optical path structure of an optical receiving device according to an embodiment of the present application;

fig. 5 is a schematic diagram of an optical path structure of an optical receiving device according to an embodiment of the present application;

fig. 6 is a schematic diagram of an optical path structure of an optical receiving device according to an embodiment of the present application;

fig. 7 is a schematic perspective view of an optical sensing device according to an embodiment of the present application.

Reference numerals:

10. an optical receiving device; 11. a lens assembly; 111. a lens; 12. a reflector; 121. a reflective surface; 1211. a first portion; 1211a, a split body; 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 emitting device.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further 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.

When the optical sensing device is used for measuring the distance of a target object, a detection echo beam reflected by the target object needs to be processed by a lens assembly in the optical receiving device and then transmitted to the photosensitive member, and compared with the longer distance, the detection echo beam reflected by the target object closer to the optical sensing device can shift when passing through the lens assembly, which may cause a large amount of detection echo beams not to be detected and received by the optical sensor, thereby causing the strength of a detection light signal received by the optical sensing device to be weaker.

The application provides an optical receiving device and optical sensing device, can improve the detection light signal's that optical sensing device received intensity, promotes optical sensing device's detection effect.

As shown in fig. 1 and fig. 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 reflector 12 and a sensor 13.

The lens assembly 11 includes at least one lens 111, 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, so that the transmission direction of light can be changed, and light distribution can be controlled to converge light and finally form an image. The lens 111 may be divided 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 this application. The number of the lens 111 in the lens assembly 11 is at least one, and in order to make the lens assembly 11 have a plurality of different optical performances, the number of the lens 111 is usually set to be plural, the plural lenses 111 may be arranged together in a stacked manner to form a lens of the optical receiving device 10, the optical axes O of the plural lenses 111 may be coincident, the optical axis O is a line passing through the center of the lens 111, and the plural lenses 111 may be the same or different, which is not limited in this embodiment.

The reflector 12 is located on a transmission path of the light passing through the lens assembly 11, and the reflector 12 has a reflective surface 121, and the reflective surface 121 is used for reflecting the light passing through the lens assembly 11. It is understood that the echo probe beam reflected from the target object within the predetermined distance range from the optical sensing device passes through the optical lens assembly 11 and is reflected by the reflecting surface 121 of the reflecting member 12, and the light transmitting path can be changed by the reflecting member 12, so that the light passing through the optical lens assembly 11 is transmitted to the light sensing member 13. The reflecting surface 121 is a smooth mirror surface having a mirror reflection function, 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 reflector 12 can be selected according to practical situations, and the application is not particularly limited. The size of the reflecting surface 121 can be selected according to actual requirements, and the application is not particularly limited.

The light sensing member 13 has a light sensing surface 131, the light sensing surface 131 is used for receiving the light reflected by the reflecting surface 121, the light sensing member 13 can receive the light reflected by the reflecting member 12, convert an optical 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 the distance, the direction, the height, the speed, the posture, the shape and the like of the target object after processing the electrical signal. The photosensitive member 13 may be an optical sensor, and the specific working principle of the optical sensor is disclosed in the related art, and the embodiment of the present application is not described in detail. The type and the category of the optical sensor can be selected according to actual requirements. The shape of the photosensitive surface 131 may be circular, elliptical, square, or triangular, and the like, and the present application is not particularly limited.

It should be noted that, the detection echo beam reflected by the target object is reflected by the reflection surface 121 of the reflection member 12 after passing through the lens assembly 11, and the reflection member 12 can change the transmission direction of the light, so that the light is transmitted to the light sensing surface 131 of the light sensing member 13 in a concentrated manner, and thus even if the detection echo beam reflected by the target object within the preset distance range is deviated when passing through the lens assembly 11, most of the detection echo beam can be detected and received by the light sensing member 13 by utilizing the reflection action of the reflection member 12, thereby improving the intensity of the detection light signal received by the optical sensing device and enhancing 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 reflectivity of the first portion 1211 being greater than the reflectivity of the second portion 1212. The first portion 1211 is a region with a higher reflectivity on the reflection surface 121, the second portion 1212 is a region with a lower reflectivity on the reflection surface 121, the first portion 1211 can be a white reflection surface 121, the second portion 1212 can be a black reflection surface 121, and the preparation materials of the first portion 1211 and the second portion 1212 can be selected according to actual requirements, so that on the basis of ensuring that the reflection surface 121 has a good reflection performance, the requirement that the reflectivity of the first portion 1211 is greater than the reflectivity of the second portion 1212 is satisfied.

Specifically, a distance between a 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, a length between the first preset position Q1 of the first portion 1211 along the second preset direction BB is b1, a distance between a 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, a length between 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 a 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 predetermined direction AA, the second predetermined direction BB and the optical axis O of the lens assembly 11 are perpendicular to each other. It should be noted that the first predetermined position Q1 and the second predetermined position Q2 may be any positions on the first portion 1211.

It can be understood that, in the process of transmitting the detection echo beam reflected by the target object to the lens assembly 11, due to the influence of factors such as air, there is a certain energy loss in the transmission process of the detection echo beam, therefore, the intensity of the detection echo beam reflected by the target object far away from the lens assembly 11 is small, the intensity of the detection optical signal received by the optical sensing device is also small, and the intensity of the detection echo beam reflected by the target object near the lens assembly 11 is large, the intensity of the detection optical signal received by the optical sensing device is also large, and the detection effect of the optical sensing device is affected by too large or too small intensity of the detection optical signal.

It can be further understood that the farther the distance between the target object and the lens assembly 11 is, the smaller the included angle between the probe echo beam reflected by the target object and the optical axis O is, that is, the smaller the distance between the reflection place 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 is (in fig. 1, L1-L4 are probe echo beams reflected by target objects 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 of the second preset direction BB along the first part 1211, the more the length of the first portion 1211 along the second preset direction BB is, the first portion 1211 has the characteristic of gradual change of the reflection performance, and the first portion 1211 has the reflectivity greater than that of the second portion 1212, so that the first portion 1211 can be distributed according to the gradual change trend by controlling the area size and the extending direction of the first portion 1211 in the reflection surface 121, so that the reflection surface 121 has the characteristic of gradual change of the 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 optical signal received by the optical sensing device is small, which is beneficial to improving the remote detection effect of the optical sensing device, meanwhile, the reflection of the detection echo beam reflected by the target object near the lens assembly 11 on the reflecting surface 121 is weak, the loss of the detection optical signal received by the optical sensing device is large, the strength of the detection optical signal received by the optical sensing device can be effectively reduced, and the near-distance detection effect of the optical sensing device is beneficial to improving.

It should be noted that there may be only two positions on the first portion 1211, such as the first predetermined position Q1 and the second predetermined position Q2, where the reflection performance is different, so that the reflection surface 121 has different reflectivities only at the first predetermined position Q1 and the second predetermined position Q2; only a partial area of the first portion 1211 may have a characteristic of gradually changing the reflection performance, so that the reflection surface 121 has a characteristic of gradually changing the reflectance in the partial area; of course, the entirety of the first portion 1211 may also have a characteristic in which the reflection performance is gradually changed, so that the reflection surface 121 has a characteristic in which the reflectance is gradually changed at the region corresponding to the first portion 1211.

With continued reference to fig. 1 and 2, in some embodiments of the present disclosure, the first portion 1211 includes a plurality of sub-bodies 1211a arranged along the second predetermined direction BB, a sum of lengths of all the sub-bodies 1211a along the second predetermined direction BB at a first predetermined position Q1 of the first portion 1211 is b1, and a sum of lengths of all the sub-bodies 1211a along the second predetermined direction BB at a second predetermined position Q2 of the first portion 1211 is b2. The specific values of b1 and b2 may be selected according to actual requirements, and are not specifically limited in this application.

It is understood that, when the first portion 1211 includes a plurality of sub-bodies 1211a, a length of the first portion 1211 along the second preset direction BB at the first preset position Q1 refers to a sum of lengths of all sub-bodies 1211a along the second preset direction BB at the first preset position Q1, and a length of the first portion 1211 along the second preset direction BB at the second preset position Q2 refers to a sum of lengths of all sub-bodies 1211a along the second preset direction BB at the second preset position Q2; the first portion 1211 is provided with a plurality of sub-bodies 1211a arranged along the second predetermined direction BB, and the gap between adjacent sub-bodies 1211a is filled with the second portion 1212 having a lower reflectivity, so that the area with a high reflectivity on the reflection surface 121 is concentrated, which may prevent the uniformity of the detection echo beam received by the light sensing element 13 from being poor, and may effectively improve the uniformity of the detection optical signal received by the optical sensing device.

It should be noted that fig. 2 only illustrates a case where the plurality of split bodies 1211a are finally connected to form an integrated structure, and the plurality of split bodies 1211a may be arranged at intervals according to actual requirements, and of course, only one split body 1211a may be arranged according to actual requirements; it should be understood that fig. 1 only illustrates the overall shape of the split 1211a as a trapezoid, and the overall shape of the split 1211a may be a triangle, an arc or other shapes according to actual requirements, which is not limited in this application.

With continued reference to fig. 1 and 2, in an embodiment of the present invention, the number of the sub-bodies 1211a is n, the length of each sub-body 1211a along the second predetermined direction BB is b1/n at the first predetermined position Q1 of the first portion 1211, the length of each sub-body 1211a along the second predetermined direction BB is b2/n at the second predetermined position Q2 of the first portion 1211, that is, the lengths of all sub-bodies 1211a along the second predetermined direction BB are the same at the first predetermined position Q1 of the first portion 1211, and the lengths of each sub-body 1211a along the second predetermined direction BB are b1 ÷ n, the lengths of all sub-bodies 1211a along the second predetermined direction BB are the same at the second predetermined position Q2 of the first portion 1211, and the lengths of each sub-body 1211a along the second predetermined direction BB are b2 ÷ n, so that the echo beams received by the light-sensing member 13 are more uniform. The specific value of n may be selected according to actual requirements, and is not specifically limited in this application.

Wherein, at the first predetermined position Q1 of the first portion 1211, the distances between two adjacent bodies 1211a along the second predetermined direction BB may be c1; at the second predetermined position Q2 of the first portion 1211, the distances between two adjacent bodies 1211a along the second predetermined direction BB may be c2, that is, at the first predetermined position Q1 of the first portion 1211, the distances between any two adjacent bodies 1211a along the second predetermined direction BB may be the same, and at the second predetermined position Q2 of the first portion 1211, the distances between any two adjacent bodies 1211a along the second predetermined direction BB may also be the same, so that the detection echo beams received by the light-sensing element 13 are more uniform. Specific values of c1 and c2 may be selected according to actual requirements, and the application is not particularly limited.

It should be noted that, a plurality of photosensitive members 13 may be provided, the plurality of photosensitive members 13 are arranged along the second predetermined direction BB, the sub-bodies 1211a correspond to the photosensitive members 13 one by one, that is, the detection echo light beam reflected by one sub-body 1211a is received by the corresponding photosensitive member 13, the distance between two adjacent sub-bodies 1211a along the second predetermined direction BB is related to the distance between two adjacent photosensitive members 13 along the second predetermined direction BB, and when the photosensitive members 13 are uniformly arranged, the distance between any two adjacent sub-bodies 1211a along the second predetermined direction BB is equal at the first predetermined position Q1 of the first portion 1211. When the photosensitive members 13 are unevenly arranged, the adjacent two bodies 1211a are not equally spaced in the second predetermined direction BB at the first predetermined position Q1 of the first portion 1211.

In an embodiment of the present application, the reflective surface 121 has a crossing point P crossing the optical axis O of the lens assembly 11, and the crossing point P is located at the first portion 1211.

It can be understood that, the larger the energy loss in the transmission process to the lens assembly 11 of the detection echo beam reflected by the target object far away from the lens assembly 11, and the closer the reflection ground on the reflection surface 121 is to the intersection point P, the intersection point P is disposed on the first portion 1211 in the embodiment of the present application, so that the detection echo beam reflected by the target object far away from the lens assembly 11 can still fall on the first portion 1211, which is beneficial to improving 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 continuously extending structure extending toward the intersection point P. It should be noted that the continuously extending structure means that the first portion 1211 is continuously and uninterruptedly extending in the direction extending to the intersection point P, so as to ensure that the distribution of the first portion 1211 has a continuously gradual trend, so that the reflective surface 121 has a continuously gradual reflectivity characteristic.

With continued reference to fig. 1 and 2, in some embodiments of the present application, the reflective surface 121 may be a concave surface. It can be understood that the concave-concave reflecting structure has a light-gathering function, and after the divergent light is directed to the concave reflecting surface 121, the detection echo light beam can be gathered after being reflected by the reflecting surface 121 through the reflecting function of the reflecting surface 121, so that the light reflected by the reflecting surface 121 is gathered on the light-sensing surface 131 of the light-sensing piece 13, and most of the detection echo light beam reflected by the target object within the preset distance range is detected and received by the light-sensing piece 13.

The reflecting surface 121 may be formed by a plurality of reflecting planes, and the plurality of reflecting planes are sequentially connected to form an inward concave reflecting structure, and it can be understood that the reflecting places of the detection echo beams reflected by the target objects with different distances from the lens assembly 11 on the reflecting surface 121 are different, and therefore, when the reflecting surface 121 is formed by a plurality of reflecting planes, each reflecting plane can correspondingly perform optical path adjustment on the detection echo beams reflected by the target objects within a certain distance range, so that the detection echo beams reflected by the target objects within a distance range corresponding to the reflecting plane are incident on the light-sensing surface 131.

Of course, as shown in fig. 3 and 4, the reflecting surface 121 may also 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 with the concave reflection structure formed by a plurality of reflection planes, the concave reflection structure formed by a plurality of reflection planes generally has a plurality of light-gathering focuses, and the concave reflection structure formed by a smooth curved surface can use the light-sensing surface 131 of the light-sensing member 13 as a focus of the concave reflection structure, so that the detection echo beams reflected from a plurality of positions are reflected onto the light-sensing surface 131 after being reflected by the reflection surface 121, and the intensity of the detection optical signal received by the optical sensing device at each position within the preset distance range can be increased, thereby improving the detection effect of the optical sensing device.

As shown in fig. 3, the reflecting surface 121 may be formed by a concave curved surface. Of course, as shown in fig. 4, the reflecting surface 121 may also be composed of a plurality of concave curved surfaces. When the reflecting surface 121 is composed of a plurality of concave curved surfaces, the plurality of concave curved surfaces may be connected to each other or disposed at intervals, and each concave curved surface may perform optical path adjustment on the detection echo beam reflected from the target object within a certain distance range, so that the detection echo beam reflected from the target object within the distance range corresponding to the reflecting plane is incident on the light-sensing surface 131.

It should be noted that, as shown in fig. 4, when a plurality of concave curved surfaces are arranged at intervals, the gap between adjacent concave curved surfaces can also play a role in reducing part of the reflectivity, so that the reflection of the detection echo beam reflected by the target object closer to the lens assembly 11 on the reflection surface 121 is weaker, the intensity of the detection optical signal received by the optical sensing device can be effectively reduced, and the short-distance detection effect of the optical sensing device is favorably improved.

It should be further explained that, the offset is larger when the detection echo beam reflected back by the object closer to the lens assembly 11 passes through the lens assembly 11, in the embodiment of the present application, the concave reflection structure is combined with the gradual change reflectivity characteristic of the reflection surface 121, the intensity of the detection echo beam reflected back by the object closer to the lens assembly 11 can be effectively increased, meanwhile, the intensity of the detection optical signal received by the optical sensing device when the object close to the lens assembly is detected can be effectively reduced, and the short-distance detection effect of the optical sensing device is favorably improved.

It should be noted that the shift of the probe echo beam reflected by the target object far away from the lens assembly 11 is very small when passing through the lens assembly 11, so that only the probe echo beam reflected by the target object within the preset distance range can be condensed to improve the intensity of the probe optical 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, and the detection echo beam reflected by the target object within the preset distance range needs to be condensed by the reflecting member 12, generally speaking, the larger the preset distance range that the optical sensing device needs to detect is, the larger the length of the reflecting surface 121 is, for example, the optical sensing device only needs to detect the target object other than 20 meters, at this time, 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, the preset distance range that the optical sensing device needs to detect can be selected according to actual needs, which is not limited in this application.

With reference to fig. 3, the reflecting surface 121 has a first focal point F1 and a second focal point F2, and light passing through the first focal point F1 and transmitted to the reflecting surface 121 is reflected by the reflecting surface 121 and then focused on the second focal point F2, the first focal point F1 coincides with the center of the exit pupil of the lens assembly 11, and the second focal point F2 may be located on the light-sensing surface 131 of the light-sensing element 13.

It should be noted that, as known to those skilled in the art, a concave reflective structure formed by a curved surface inevitably has two focal points, and in the case where the influence of other components on light is not considered, light emitted from one focal point of the concave reflective structure is inevitably collected at the other focal point of the concave reflective structure after being reflected by the concave reflective structure, and the focal point at which the light reflected by the concave reflective structure is collected is the light-collecting focal point of the concave reflective structure. For the optical system such as the lens assembly 11, an image formed by the aperture stop of the optical system in the image space of the optical system is called "exit pupil" of the optical system, and the center of the exit pupil is the center of the exit pupil, the light entering the lens assembly 11 will 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 will not change when passing through the lens assembly 11.

Therefore, in the embodiment of the present application, the first focal point F1 of the reflecting surface 121 is disposed to coincide with the center of the exit pupil of the lens assembly 11, and the second focal point F2 can be located on the light-sensing surface 131 of the light-sensing element 13, so that the probe echo beam reflected from the target object is focused on the light-sensing surface 131 after passing through the lens assembly 11 and being reflected by the reflecting surface 121, and the intensity of the probe optical signal received by the optical sensing device can 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 photosensitive surface 131. It can be understood that, in the process of transmitting the light reflected by the reflection surface 121 to the second focal point F2 of the reflection surface 121, due to the influence of air media and the like, a part of the light is deflected, so that a part of the light is scattered to the vicinity of the second focal point F2, and the second focal point F2 of the reflection surface 121 is arranged to coincide with the center of the light sensing surface 131, so that more light can be transmitted to the light sensing surface 131 without changing the area of the light sensing surface 131.

In another embodiment of the present application, as shown in fig. 5, the reflective surface 121 is a flat surface. It can be understood that, compared to the concave reflection structure, the light-gathering effect of the plane reflection structure is slightly poor, but the plane reflection structure is easier to form, and the production cost of the reflection 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 reflection surface 121 is a plane, only one reflection element 12 may be provided, and in this case, the transmission direction of the probe echo beam after passing through the lens assembly 11 may be changed by only one reflection element 12, so that the probe echo beam is intensively transmitted toward the light-sensing surface 131 of the light-sensing element 13.

Of course, as shown in fig. 6, when the reflection surface 121 is a plane, a plurality of reflection members 12 may be disposed, and the positions of the plurality of reflection members 12 are designed, so that the plurality of reflection members 12 are mutually matched, and the transmission direction of the detection echo beam after passing through the lens assembly 11 may be changed for a plurality of times, so that more detection echo beams are intensively transmitted to the light-sensing surface 131 of the light-sensing member 13.

As shown in fig. 1 to 6, in an embodiment of the present application, the light-sensing surface 131 of the light-sensing element 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 light-sensing surface 131 to facilitate the placement of the lens assembly 11, the reflecting element 12 and the light-sensing element 13 in the optical sensing device.

Of course, the positions of the lens assembly 11, the reflector 12 and the sensor 13 can be selected according to actual requirements, for example, the lens assembly 11 and the sensor 13 are located on the same side of the reflector 12, the reflecting surface 121 of the reflector 12 is parallel to the sensing surface 131 of the sensor 13, and the optical axis O of the lens assembly 11 is inclined with respect to the reflecting surface 121.

Based on the above optical receiving device 10, the present application further provides an optical sensing device, as shown in fig. 7, which includes an optical emitting device 30 and the optical receiving device 10 in any of the above embodiments.

The optical transmitter 30 is configured to transmit a probe beam to the target object, and the optical receiver 10 is configured to receive a probe echo beam reflected by the target object.

Specifically, the optical emission device 30 includes a light source, the light source can emit a detection light beam to the target object, the light source can be a surface light source, a point light source or a line light source, the light source can be a laser light source, and of course, the light source can also be other kinds of light sources, such as a high-intensity LED light source, which is not limited in this application.

Specifically, the optical sensing device may further include a control portion, and the control portion may process the electrical signal to obtain parameters of the target object, such as a distance, an orientation, a height, a speed, an attitude, and a shape, thereby implementing a detection function. The control part may be a Microcontroller Unit (MCU).

Taking a laser radar applied to a vehicle as an example, a light source in an 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 a 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 cloud picture, and after data processing is performed on the radar cloud picture, parameters such as distance, direction, height, speed, posture and shape of the target object can be obtained, so that a radar detection function is realized. Of course, according to actual requirements, the optical sensing device may also realize functions such as part diameter detection, surface roughness detection, strain detection, displacement detection, vibration detection, speed detection, distance detection, acceleration detection, and object shape detection.

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 aerial vehicle or a robot, so as to realize functions of 3d (3 Dimensions) sensing, environment image sensing and the like. 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 electronic control unit of the vehicle according to the height of the vehicle body, the vehicle speed, the steering angle, the speed, the brake and the like, the electronic control unit of the vehicle controls an actuating mechanism of the suspension, and parameters such as the rigidity of the suspension, the damping force of a shock absorber, the height of the vehicle body and the like are changed, so that the automobile has good riding comfort and operation stability. The optical sensing device can also be applied to systems such as a light control system, a vehicle speed measuring system, a driving control system and the like of a vehicle.

With continued reference to fig. 7, in an embodiment of the present application, the optical sensing apparatus further includes a base 21, a rotation driving device 22, a cover plate 23, a protective cover 24, and an external interface 25.

The base 21 has an accommodating cavity, the rotation driving device 22 is located in the accommodating cavity, the optical receiving device 10 and the optical transmitting device 30 are installed on the rotation driving device 22, the optical transmitting device 30 and the optical receiving device 10 are arranged side by side, a light outlet of the optical transmitting device 30 and a light inlet of the optical receiving device 10 are located on the same side, light emitted by the light source is emitted from the light outlet, and the light is reflected by the target object and then emitted into the optical receiving device 10 from the light inlet. The rotation driving device 22 can drive the optical receiving device 10 and the optical transmitting device 30 to rotate so as to change the orientation of the light source and the lens assembly 11, so that the optical receiving device 10 can better receive the detection echo beam reflected from the target object, and the rotation driving device 22 can be a motor or the like having power and capable of driving the optical receiving device 10 and the optical transmitting device 30 to rotate.

The optical receiving device 10 further includes a frame 14, a cover plate 23 covers the frame 14, and the cover plate 23 and the frame 14 may enclose a closed optical transmission channel, in which a detection echo beam reflected from the target object passes through the lens assembly and is transmitted.

The protective cover 24 may be disposed on the base 21, and a protective cavity may be formed between the protective cover 24 and the base 21, and the optical receiving device 10 is accommodated in the protective cavity, so as to protect the optical receiving device 10 through the protective cover 24. The protective cover 24 is detachably connected with the base 21, and the protective cover 24 can be detachably connected through clamping, threaded connection, riveting or inserting connection 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 element 13, so as to transmit signals between the photosensitive element 13 and the control portion through the external interface 25.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An optical receiving apparatus, comprising:

a lens assembly including at least one lens;

the first position department of predetermineeing of first portion with the optical axis of lens subassembly is a1 along the interval of first direction of predetermineeing, the first position department of predetermineeing of first portion predetermines the length of direction along the second and is b1, the second of first portion predetermine the position department with the optical axis of lens subassembly is a2 along the interval of first direction of predetermineeing, the second of first portion predetermines the position department and predetermines the length of direction along the second and be b2, the second predetermines the position and is located first predetermined position is close to one side of the optical axis of lens subassembly, lens a1 is greater than a2, b1 is less than b2, first predetermined direction the second predetermines the direction and the optical axis mutually perpendicular of lens subassembly sets up.

2. The optical receiving device according to claim 1, wherein the first portion includes a plurality of sub-bodies arranged along the second predetermined direction, and at a first predetermined position of the first portion, a sum of lengths of all the sub-bodies along the second predetermined direction is b1; 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 divided bodies is n, and at a first preset position of the first portion, the length of each divided body along the second preset direction is b1/n; 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 the first preset position of the first portion, the distance between two adjacent separated 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 with an optical axis of the lens assembly, the intersection point being located at the first portion.

6. An optical receiving device according to claim 5, wherein the first portion is a continuous extending structure extending toward the intersection point.

7. An optical receiving device according to any one of claims 1 to 6, wherein the reflecting surface is a concave curved surface.

8. The optical receiver of claim 7, wherein the reflective surface has a first focus and a second focus, light passing through the first focus and transmitted toward the reflective surface is collected at the second focus after being reflected by the reflective surface, the first focus is coincident with a center of an exit pupil of the lens assembly, and the second focus is located on the photosensitive surface of the photosensitive element.

9. An optical receiving device according to claim 8, wherein the second focal point of the reflecting surface is located at the center of the photosensitive surface.

10. An optical sensing device comprising an optical emitting device and an optical receiving device according to any one of claims 1 to 9; the optical transmitting device is used for transmitting a detection light beam to a target object, and the optical receiving device is used for receiving a detection echo light beam reflected by the target object.