CN114779267B - Laser ranging system and laser ranging device - Google Patents
Laser ranging system and laser ranging device Download PDFInfo
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- CN114779267B CN114779267B CN202210409497.7A CN202210409497A CN114779267B CN 114779267 B CN114779267 B CN 114779267B CN 202210409497 A CN202210409497 A CN 202210409497A CN 114779267 B CN114779267 B CN 114779267B
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- light
- optical element
- light source
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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
- G01S17/10—Systems determining position data of a target for measuring distance only using transmission of interrupted, pulse-modulated waves
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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
Abstract
Laser rangefinder system and laser rangefinder includes: a light source; a first optical element including a first portion for converting the emission light of the light source into collimated light and a second portion for converging reflected back light after the collimated light is reflected by a target object; the photosensitive chip is used for receiving the reflected return light and outputting measurement data; a second optical element disposed between the light source and the first optical element; and the beam expander is embedded in the second optical element and penetrates through the second optical element, the optical axis of the beam expander and the optical axis of the light source are on the same straight line, emitted light emitted by the light source passes through the beam expander and is incident into the first optical element, and the second optical element reflects the reflected light converged by the first optical element to the photosensitive chip.
Description
Technical Field
The invention relates to the technical field of optical measurement and optical scanning, in particular to the technical field of laser radars, and specifically relates to a laser ranging system and a laser ranging device.
Background
The laser radar is a radar system that detects a characteristic quantity such as a position of a target by emitting a laser beam. The photosensitive sensor of the laser radar can convert the acquired optical pulse signal into an electric signal, and the time information corresponding to the electric signal is acquired based on the comparator, so that the distance information between the laser radar and the target object is obtained.
In the distance measuring device, the light source generally selects an Edge Emitting Laser (EEL) and an avalanche diode (APD) as a receiving element, wherein the EEL and the APD are both used as key devices to realize the generation and detection of laser beams.
When the light source is assembled to the mount of the laser surveying system, since there are machining variations and mounting variations, it is necessary to adjust the position of the light source (the relative position of the light source with respect to the lens in the optical axis direction, the circumferential relative position of the light source with respect to the lens center, and the radial relative position) to achieve calibration.
However, since the optical path of the emitted light and the optical path of the received light are overlapped, the emitted light and the received light share one lens, which causes the focal position of the received light to change when the position of the light source is adjusted, and the adjusted focal position of the received light needs to be adjusted twice.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a laser ranging system and a laser ranging device, which are used for solving the problem that the position of an adjusted light receiving photosensitive chip needs to be secondarily adjusted because the focal position of the light receiving is changed when the position of a light source is adjusted because a lens is shared by emitting light and receiving light of a laser in the prior art.
One embodiment of the present invention provides a laser ranging system, including: a light source;
a first optical element including a first portion for converting emission light of the light source into collimated light and a second portion for condensing reflected back light after the collimated light is reflected by a target, a focal length of the first portion being different from a focal length of the second portion;
the photosensitive chip is used for receiving the reflected return light and outputting measurement data;
a second optical element disposed between the light source and the first optical element; and
the beam expander is embedded in the second optical element and penetrates through the second optical element, the optical axis of the beam expander and the optical axis of the light source are on the same straight line, emitted light emitted by the light source penetrates through the beam expander and is incident into the first optical element, and the reflected light is reflected to the photosensitive chip by the second optical element.
In one embodiment, the first optical element includes a first surface and a second surface, the emitted light is incident from the first surface of the first optical element and exits from the second surface of the first optical element, the second surface includes a first aspheric region and a second aspheric region, the first aspheric region and the corresponding first surface constitute the first portion, the second aspheric region and the corresponding first surface constitute the second portion;
and/or the optical axes of the first part and the second part of the first optical element are on the same straight line, and the optical axes of the first aspheric surface area and the second aspheric surface area are on the same straight line.
In one embodiment, the second aspheric region is disposed around the first aspheric region;
and/or the focal length of the second aspheric surface area is larger than the focal length of the first aspheric surface area.
In one embodiment, the second optical element includes a third surface and a fourth surface, the emitted light emitted by the light source enters from the third surface of the second optical element and exits from the fourth surface of the second optical element, and the reflected return light condensed by the first optical element is reflected by the fourth surface of the second optical element and then output to the photosensitive chip.
In one embodiment, the fourth surface includes a third region and a fourth region, the beam expander penetrates through the third region, the fourth region is disposed around the third region, the emitted light emitted by the light source passes through the third region of the second optical element and is incident on the first surface of the first optical element, and the reflected light condensed by the first optical element is reflected by the fourth region of the fourth surface and is output to the photosensitive chip.
In one embodiment, the third surface is coated with a first optical film, the third region is coated with a first optical film, and the fourth region is coated with a second optical film.
In one embodiment, the first optical film comprises an antireflective film;
and/or the second optical film comprises any one of a reflecting film and a semi-transparent and semi-reflecting film.
In one embodiment, the beam expander comprises an input portion facing the light source and extending beyond the second optical element, and an output portion facing the first optical element and extending beyond the second optical element;
and/or the first optical element and the second optical element are integrally formed by adopting a glass hot-pressing process.
In one embodiment, the optical axis of the light source and the optical axis of the first optical element are located on the same axis;
and/or, when the second optical element comprises a third surface and a fourth surface, and the fourth surface comprises a third area and a fourth area, the center point of the third area is located on the optical axis of the light source or the first optical element.
In one embodiment, the third surface and the fourth surface are planar;
and/or the third surface and the fourth surface are arranged in parallel;
and/or an included angle between an optical axis of the light source and the third surface or the fourth surface ranges from 44 degrees to 46 degrees.
In one embodiment, the first portion of the first optical element is located on an optical axis of the light source;
and/or, when the first optical element includes a first surface and a second surface, and the second surface includes a first aspheric surface region and a second aspheric surface region, the ratio of the surface area of the second aspheric surface region to the surface area of the first aspheric surface region ranges from 4 to 5.
In one embodiment, the laser ranging device further comprises:
a mounting seat; and
the laser ranging system is arranged in the mounting seat, and the laser ranging system is the laser ranging system in any one of the multiple embodiments;
wherein, the mount pad includes:
the light inlet is used for arranging a light source module, and the light source module comprises the light source;
the light outlet is arranged opposite to the light inlet and is used for arranging a lens module, and the lens module comprises the first optical element;
the accommodating cavity is arranged between the light inlet and the light outlet and is used for arranging a reflection module, and the reflection module comprises the second optical element; and
and the reflected light receiving port is used for arranging the photosensitive chip.
In one embodiment, the light source module further includes:
the sleeve is sleeved on the outer side of the light source, and the light emitting end of the light source is exposed on the outer side of the sleeve;
the mounting plate is fixed on the light inlet of the mounting seat, a first mounting hole is formed in the mounting plate, and the sleeve penetrates through the first mounting hole of the mounting plate so that the light outlet end of the light source extends into the first cavity of the accommodating cavity;
and the adjusting component surrounds one end of the sleeve, which corresponds to the light emitting end of the light source, and is fixed on the mounting plate.
In one embodiment, the reflection module comprises a positioning plate, the positioning plate is arranged in the accommodating cavity, a second mounting hole is arranged inside the positioning plate, and the second optical element is fixed in the second mounting hole;
the cover plate and the second optical element are respectively arranged on two sides of the positioning plate, a through hole is formed in the cover plate, the through hole of the cover plate is positioned on the optical axis of the light source, and the through hole of the cover plate is a long-strip-shaped through hole; and
the extinction piece is arranged on the reflected light receiving opening, a light guide passage is formed in the extinction piece, the diameter of the light guide passage is gradually reduced along the direction far away from the second optical element, and extinction grains are formed on the side wall of the light guide passage.
The laser ranging system and the laser ranging device provided by the above embodiments of the present invention have the following beneficial effects:
1. when the light source is assembled on the mounting seat of the laser measuring system, due to the processing deviation and the mounting deviation, the position of the light source needs to be adjusted to realize calibration, so that the optical axis of the light source is coincident with the optical axis of the lens. However, since the emitting light and the receiving light share one lens, the optical path of the emitting light and the optical path of the receiving light are overlapped, which causes the focal position of the receiving light to change and exceed the sensing range of the photosensitive chip when the position of the light source is adjusted, so that the setting position of the adjusted receiving light photosensitive chip is also adjusted for the second time. In one embodiment, the first optical element is a lens, and the first optical element includes a first portion for emitting light and a second portion for receiving light, and since the focal length of the first portion is different from that of the second portion, it is equivalent to using two lenses to respectively emit light and receive light, wherein the first portion is used for converting the emitted light into collimated light, and the second portion is used for converging reflected back light after the collimated light is reflected by an object, so that the first optical element does not interfere with each other when emitting light and receiving light. Make the laser rangefinder system of this embodiment only need install the focus position at corresponding second portion with the sensitization chip, no matter changed the position of light source for first optical element when installation debugging light source position, or carry out the range finding to the target object of more remote, the focus position of the light of reflection back can not produce great change, and the sensitization chip can receive the light of reflection back effectively, need not the secondary adjustment sensitization chip set up the position.
2. In one embodiment, the first surface of the first optical element is planar; the second surface of the first optical element comprises a first aspheric surface area and a second aspheric surface area, wherein the first aspheric surface area is an emergent surface of the emitted light, and the second aspheric surface area is a receiving surface of the emitted light reflected by the object and used for receiving the reflected back light; the first aspheric surface area and the corresponding first surface form the first part, and the first part collimates the emitted light with a divergence angle emitted by the laser into collimated light, so that the collimated light can be emitted to a longer distance; the second aspheric surface area and the corresponding first surface form the second part, reflected return light obtained by reflecting collimated light by the target object is focused, the reflected return light is reflected to the photosensitive chip through the second optical element, the photosensitive chip converts the obtained optical pulse signal of the reflected return light into an electric signal, and time information corresponding to the electric signal is obtained based on comparison, so that distance information between the laser ranging system and the target object is obtained.
3. In the prior art, since the emitting light and the receiving light share one lens, and the optical path of the emitting light and the optical path of the receiving light are overlapped, when the position of the light source is adjusted or the distance measurement is performed on a distant target object, the focal position of the receiving light is changed, and the adjusted focal position of the receiving light needs to be adjusted for the second time. The optical path of the emitted light and the optical path of the received light are overlapped and have the same focal length, and when the distance measurement is carried out, the emitted light and the reflected light are easy to interfere with each other, so that the measurement result is not accurate enough. In one embodiment, the second aspheric surface region is disposed around the first aspheric surface region; because the emitted light from the light source is relatively concentrated with respect to the reflected back light, mainly concentrated through the first aspheric region of the first optical element; the second aspheric surface region is arranged around the first aspheric surface region, and the area of the second aspheric surface region is far larger than that of the first aspheric surface region, and the second aspheric surface region is used for receiving most of the reflected return light. The first optical element adopts two different aspheric surfaces, the two different aspheric surfaces have different focuses, and the two different aspheric surfaces respectively correspond to emitting light or receiving light, so that the first optical element does not interfere with each other when emitting light and receiving light.
4. In one embodiment, the first optical film coated on the third surface of the second optical element and the third area of the fourth surface can enhance light transmittance, especially can enhance light transmittance of light emitted by the light source, and the first optical film is preferably an antireflection film, and the antireflection film mainly functions to reduce reflection and increase light transmittance. That is, when the emission light emitted from the light source is incident on the third surface of the second optical element, the first optical film may allow more emission light to enter the second optical element; when the laser light source strikes the third region of the third surface of the second optical element, the first optical film may cause more of the emitted light to exit the third region. The second optical film coated on the fourth region of the fourth surface of the second optical element can enhance reflectivity, especially enhance reflection of reflected back light entering the fourth region, reflect and focus the reflected back light converged from the second aspheric region of the first optical element to the photosensitive chip, is any one of a reflective film and a semi-transparent reflective film, is preferably a semi-transparent reflective film, enhances light transmittance of emitted light exiting the fourth region, and can reflect received light entering the fourth region.
5. In one embodiment, the beam waist radius of the emitted light can be enlarged by the beam expander, and the divergence angle of the laser beam can be changed. Specifically, light emitted by the laser light source is emitted to the beam expander, and after the emitted light enters the beam expander through the input part, the emitted light is emitted out of the beam expander through the output part at a preset emission angle and reaches the first optical element, so that the emitted light can be collimated by the first aspheric surface area in the first optical element. And the glass hot pressing process is a manufacturing process for heating glass to a softening point (6-700 ℃), putting the glass into a smooth mould, applying an acting force to the glass through an upper mould to bend and form the glass, and then cooling and fixing the shape of the glass to obtain a glass product with a required shape. The first optical element and the second optical element are integrally formed by adopting a glass hot pressing process, so that the production flow can be optimized, and the production and the manufacture of the first optical element and the second optical element are simpler.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the embodiments or technical solutions of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 shows a schematic optical path diagram of a laser ranging system of the present invention;
FIG. 2 is a schematic view of a first optical element according to the present invention;
FIG. 3 is a schematic diagram of a second optical element according to the present invention;
FIG. 4 is a schematic diagram of a fourth surface structure of a second optical element according to the present invention;
FIG. 5 is a schematic diagram of an exploded view of the laser ranging device of the present invention;
FIG. 6 is a schematic view of a positioning plate according to the present invention;
FIG. 7 is a schematic view of the cover plate structure of the present invention;
FIG. 8 is a front view of the laser distance measuring device of the present invention;
FIG. 9 is a schematic diagram showing a right side view of the laser ranging apparatus according to the present invention;
FIG. 10 is a schematic cross-sectional view in the direction C-C in FIG. 9;
FIG. 11 is a schematic view showing the structure of a mat member of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that if directional indications (such as up, down, left, right, front, back, 8230) \8230;) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components in a specific posture, the motion situation, etc., and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, if the meaning of "and/or" and/or "appears throughout, the meaning includes three parallel schemes, for example," A and/or B "includes scheme A, or scheme B, or a scheme satisfying both schemes A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
In order to better describe the technical solutions in the present application, some technical terms are explained below:
the light emitted by the laser source is light beam with small beam waist radius and large divergence angle, and is easy to diverge in the propagation process.
Collimated light, a light beam obtained by focusing or collimating emitted light through an optical element, has a larger beam waist radius and a smaller divergence angle compared with the original light beam, and is not easy to diverge in the propagation process.
The reflected light is emitted from the laser light source, and is reflected after being irradiated on the target object, and the light beam returns along the optical axis direction.
Referring to fig. 1 to 4, an embodiment of the invention provides a laser ranging system 100, including: a light source 110 for emitting light;
a first optical element 120 including a first portion for converting the emission light of the light source 110 into collimated light and a second portion for condensing reflected back light after the collimated light is reflected by a target object, a focal length of the first portion being different from a focal length of the second portion;
a light sensing chip 130 for receiving the reflected return light and outputting measurement data;
a second optical element 140 disposed between the light source 110 and the first optical element 120; and
and a beam expander 150 embedded in the second optical element 140 and penetrating through the second optical element 140, wherein an optical axis of the beam expander 150 and an optical axis of the light source 110 are on the same straight line, the emitted light of the light source 110 passes through the beam expander 150 and enters the first optical element 120, and the second optical element 140 reflects the reflected light converged by the first optical element 120 to the photosensitive chip 130.
When the light source 110 is assembled to the mounting base 210 of the laser surveying system, since there are machining deviations and mounting deviations, it is necessary to adjust the position of the light source 110 to achieve calibration so that the optical axis of the light source 110 coincides with the optical axis of the lens. However, since the emitting light and the receiving light share a lens, the optical path of the emitting light and the optical path of the receiving light are overlapped, which causes the focal position of the receiving light to change and exceed the sensing range of the photo sensor chip 130 when the position of the light source 110 is adjusted, so that the position of the photo sensor chip 130 for receiving the adjusted light is adjusted again.
In this embodiment, the first optical element 120 is a lens, and the first optical element 120 includes a first portion for emitting light and a second portion for receiving light, and since the focal length of the first portion is different from that of the second portion, it is equivalent to using two lenses to respectively emit light and receive light, where the first portion is used to convert the emitted light into collimated light, and the second portion is used to converge the reflected light after the collimated light is reflected by the object, so that the first optical element 120 does not interfere with each other when emitting light and receiving light. Therefore, the laser ranging system 100 of the embodiment only needs to install the photosensitive chip 130 at the focal position corresponding to the second portion, and no matter the position of the light source 110 relative to the first optical element 120 is changed when the position of the light source 110 is adjusted, or the distance measurement is performed on the target object at a longer distance, the focal position of the reflected light does not change greatly, and the photosensitive chip 130 can effectively receive the reflected light without adjusting the setting position of the photosensitive chip 130 twice.
Referring to fig. 2, in one embodiment, the first optical element 120 includes a first surface 121 and a second surface 122, the emitting light is incident from the first surface 121 of the first optical element 120 and exits from the second surface 122 of the first optical element 120, the second surface 122 includes a first aspheric surface area 1221 and a second aspheric surface area 1222, the first aspheric surface area 1221 and the corresponding first surface 121 constitute the first portion, and the second aspheric surface area 1222 and the corresponding first surface 121 constitute the second portion.
And/or the optical axes of the first part and the second part of the first optical element are on the same straight line, and the optical axes of the first aspheric surface area and the second aspheric surface area are on the same straight line.
In the existing laser ranging system, the emitting light and the receiving light share the same lens, and the light path of the emitting light and the light path of the receiving light are overlapped, so that the focal position of the receiving light is changed when the position of a light source is adjusted and exceeds the sensing range of a photosensitive chip; or along with the distance increase between laser ranging system and the target object, the reflection back light after the transmission light is jetted out from the laser ranging system by the target object reflection can produce the divergence of corresponding degree, and the focus position that the divergent reflection back light received the focus through lens can produce the change, surpasss the effective detection scope of sensitization chip to lead to the sensitization chip setting position of receiving light that adjusts also to carry out the secondary control.
In the present embodiment, the first surface 121 of the first optical element 120 is a plane; the second surface 122 of the first optical element 120 includes a first aspheric region 1221 and a second aspheric region 1222, where the first aspheric region 1221 is an exit surface of the emitted light, and the second aspheric region 1222 is a receiving surface of the reflected back light after the emitted light is reflected by the object; the first aspheric area 1221 and the corresponding first surface 121 form the first portion, and collimate the emitted light with a divergence angle from the laser into collimated light, so that the collimated light can be emitted to a longer distance; the second aspheric surface area 1222 and the corresponding first surface 121 form the second portion, the reflected back light reflected by the target object from the collimated light is focused, the reflected back light is reflected to the light sensing chip 130 through the second optical element 140, the light sensing chip 130 converts the obtained light pulse signal of the reflected back light into an electrical signal, and time information corresponding to the electrical signal is obtained based on comparison, so as to obtain distance information between the laser ranging system 100 and the target object.
By making the optical axes of the first and second portions of the first optical element 120 on the same straight line, that is, the optical axes of the first aspherical region 1221 and the second aspherical region 1222 are on the same straight line; when the device is installed, only the emission path of the emitted light needs to be aligned, so that the emitted light can be reflected back along the same path, and no additional adjustment is needed.
In one embodiment, the second aspheric region 1222 is disposed around the first aspheric region 1221;
and/or the focal length of the second aspheric surface region 1222 is greater than the focal length of the first aspheric surface region 1221.
In the prior art, since the emitted light and the received light share one lens, and the optical path of the emitted light and the optical path of the received light are overlapped, when the position of the light source is adjusted or the distance measurement is performed on a distant target object, the focal position of the received light is changed, and the adjusted focal position of the received light needs to be adjusted secondarily. The optical path of the emitted light coincides with the optical path of the received light and has the same focal length, and the emitted light and the reflected light are easy to interfere with each other when ranging is performed, so that the measurement result is not accurate enough.
In this embodiment, the second aspheric region 1222 is disposed around the first aspheric region 1221; because the emitted light from the light source 110 is relatively concentrated with respect to the reflected back light, the emitted light is mainly concentrated in the first aspheric region 1221 of the first optical element 120; while the reflected back light is relatively divergent and the optical axis of the reflected back light is coaxial with the optical axis of the emitted light from the light source 110, since the second aspheric surface region 1222 is disposed around the first aspheric surface region 1221 and the area of the second aspheric surface region 1222 is much larger than that of the first aspheric surface region 1221, the second aspheric surface region 1222 is used for receiving most of the reflected back light. Moreover, the first optical element 120 adopts two different aspheric surfaces, the two different aspheric surfaces have different focal points, and the two different aspheric surfaces respectively emit light or receive light, so that the first optical element 120 does not interfere with each other when emitting light and receiving light.
And, the first aspheric area 1221 is used to collimate the emitted light from the light source 110 to obtain collimated light, thereby reducing the divergence of the emitted light during the emission and reflection processes. And the focal length of the second aspheric surface area 1222 is greater than that of the first aspheric surface area 1221, so that the influence of the movement of the focal position of the reflected back light caused by adjusting the position of the light source 110 or testing a target object at a far position on the receiving effect of the light sensing chip 130 can be reduced, the focal position formed by the reflected back light is always located on the light sensing chip 130, the light intensity of the focused light spot of the reflected back light meets the detection requirement of the light sensing chip 130, and the position of the light sensing chip 130 does not need to be adjusted for a second time.
Referring to fig. 3 and 4, in one embodiment, the second optical element 140 includes a third surface 141 and a fourth surface 142, the emitted light of the light source 110 enters from the third surface 141 of the second optical element 140 and exits from the fourth surface 142 of the second optical element 140, and the reflected light condensed by the first optical element 120 is reflected by the fourth surface 142 of the second optical element 140 and then output to the light sensing chip 130.
When the collimated light emitted from the laser ranging system 100 is irradiated onto a target object, the collimated light is reflected to form reflected return light, and when laser light coaxial with the emitted light in the reflected return light returns to the inside of the light source 110 along the original path, the light source 110 may be damaged due to focusing of the lens, which affects the working stability of the light source 110.
In this embodiment, the emitted light from the light source 110 enters from the third surface 141 of the second optical element 140 and exits from the fourth surface 142 of the second optical element 140, is collimated by the first optical element 120 into collimated light and directed to the target object, and is reflected after being irradiated to the target object to form reflected back light, the reflected back light is converged by the first optical element 120 and emitted and output to the photosensitive chip 130 through the fourth surface 142 of the second optical element 140, the photosensitive chip 130 converts the obtained optical pulse signal of the reflected back light into an electrical signal, and time information corresponding to the electrical signal is obtained based on comparison, so as to obtain the distance information between the laser ranging system 100 and the target object. The fourth surface 142 of the second optical element 140 is mainly used for reflecting the focused reflected light, and preventing the reflected light from returning to the inside of the light source 110 along the coaxial optical path, which may damage the light source 110.
Referring to fig. 4, in one embodiment, the fourth surface 142 includes a third region 1421 and a fourth region 1422, the beam expander 150 penetrates the third region 1421, the fourth region 1422 is disposed around the third region 1421, the emitted light emitted by the light source 110 passes through the third region 1421 of the second optical element 140 and is incident on the first surface 121 of the first optical element 120, and the reflected light condensed by the first optical element 120 is reflected by the fourth region 1422 of the fourth surface 142 and is output to the photosensitive chip 130.
When the emitted light from the light source 110 directly passes through the second optical element 140 and enters the second optical element 140 for collimation, since the emitted light from the light source 110 has a large divergence angle and the beam waist radius is small, the first optical element 120 has no good collimation effect on the emitted light, and the beam waist radius of the collimated light generated thereby is small.
In this embodiment, the beam expander 150 is a lens assembly capable of changing a beam waist radius and a divergence angle of the laser beam, and the beam waist radius of the emitted light can be enlarged by the beam expander 150, the divergence angle of the laser beam can be changed, and the emitted light can reach the first optical element 120 at a preset emission angle, which is more beneficial to the collimation of the emitted light by the first aspheric surface area 1221 in the first optical element 120.
Preferably, the central point a of the third region 1421 is located on the optical axis of the light source 110, the fourth surface 142 is rectangular, the central point a of the third region 1421 is located right below the central point B of the fourth surface 142, and the emitted light emitted by the light source 110 enters from the third surface 141 of the second optical element 140 and then exits from the third region 1421 of the fourth surface 142 of the second optical element 140; the reflected back light reflected by the object is converged by the second aspheric surface region 1222 of the first optical element 120, and then reflected by the fourth region 1422 of the fourth surface 142 of the second optical element 140 and focused on the photo sensor chip 130, so as to prevent the reflected back light from being directly reflected back to the light source 110.
In one embodiment, the third surface 141 is coated with a first optical film, the third region 1421 is coated with a first optical film, and the fourth region 1422 is coated with a second optical film.
Because the optical surface of the optical element can refract the emitted light, when the emitted light emitted by the light source passes through the optical element, part of the emitted light is reflected to other directions, so that the emitted light is lost, and the detection effect of the laser ranging system on the target object is reduced.
In this embodiment, a first optical film is coated on the third surface 141 and the third region 1421 of the fourth surface 142, and the first optical film can enhance the light transmittance, especially the light transmittance of the light emitted by the laser source 110, reduce the reflection of the emitted light when the emitted light enters from the third surface 141 of the second optical element 140 and exits from the third region 1421 of the fourth surface 142, and a second optical film is coated on the fourth region 1422 of the fourth surface 142, and the second optical film can enhance the reflection of the optical surface of the optical element on the emitted light, so as to enhance the reflection of the fourth region 1422 of the fourth surface 142 on the reflected back light condensed by the first optical element 120, reflect the reflected back light into the photosensitive chip 130 as much as possible, and avoid the reflected back light returning to the light source 110 to damage the light source 110.
In one embodiment, the first optical film comprises an antireflective film;
and/or the second optical film comprises any one of a reflecting film and a semi-reflecting film.
In this embodiment, the first optical film coated on the third surface 141 of the second optical element 140 and the third region 1421 of the fourth surface 142 can enhance light transmittance, especially can enhance light transmittance of light emitted from the light source 110, and the first optical film is preferably an anti-reflection film, and the main function of the anti-reflection film is to reduce reflection and increase light transmittance. That is, when the emission light emitted from the light source 110 is incident to the third surface 141 of the second optical element 140, the first optical film may allow more emission light to enter the second optical element 140; when the laser light source 110 hits the third region 1421 on the third surface 141 of the second optical element 140, the first optical film may allow more emitted light to exit the third region 1421. The second optical film coated on the fourth area 1422 of the fourth surface 142 of the second optical element 140 can enhance reflectivity, especially enhance reflection of reflected back light incident on the fourth area 1422, reflect and focus the reflected back light converged by the second aspheric area 1222 of the first optical element 120 to the photosensitive chip 130, and is any one of a reflective film or a semi-transparent and semi-reflective film, and the second optical film is preferably a semi-transparent and semi-reflective film, which enhances light transmittance of the emitted light exiting the fourth area 1422 and can reflect the received light incident from the fourth area 1422.
In one embodiment, the beam expander 150 includes an input portion facing the light source 110 and extending out of the second optical element 140, and an output portion facing the first optical element 120 and extending out of the second optical element 140;
and/or the first optical element 120 and the second optical element 140 are integrally formed by a glass hot-pressing process.
In this embodiment, the beam expander 150 is a lens assembly capable of changing the beam waist radius and the divergence angle of the laser beam, and the beam waist radius of the emitted light can be enlarged by the beam expander 150 to change the divergence angle of the laser beam.
Specifically, light emitted from the laser source 110 is emitted to the beam expander 150, and after the emitted light enters the beam expander 150 through the input portion, the emitted light is emitted from the beam expander 150 through the output portion at a preset emission angle and reaches the first optical element 120, which is more favorable for the first aspheric surface area 1221 in the first optical element 120 to collimate the emitted light.
And the glass hot pressing process is a manufacturing process for heating glass to a softening point (6-700 ℃), putting the glass into a smooth mould, applying force to the glass through an upper mould to bend and form the glass, and then cooling and fixing the shape of the glass to obtain a glass product with a required shape. The first optical element 120 and the second optical element 140 are integrally formed by a glass hot pressing process, so that the production flow can be optimized, and the production and the manufacture of the first optical element 120 and the second optical element 140 are simpler.
In one embodiment, the optical axis of the light source 110 and the optical axis of the first optical element 120 are located on the same axis;
and/or, when the second optical element 140 includes a third surface 141 and a fourth surface 142, and the fourth surface 142 includes a third region 1421 and a fourth region 1422, a center point of the third region 1421 is located on an optical axis of the light source 110 or the first optical element 120.
In the present embodiment, by positioning the optical axis of the light source 110 and the optical axis of the first optical element 120 on the same straight line, the emitted light emitted from the light source 110 directly enters the first optical element 120 along the propagation direction, and the emitted light does not need to be angularly adjusted. And by locating the third region 1421 of the fourth surface 142 on the optical axis of the light source 110 or the first optical element 120, the emitted light can enter from the third surface 141 of the second optical element 140 and then exit from the third region 1421 of the fourth surface 142.
In one embodiment, the third surface 141 and the fourth surface 142 are planar;
and/or, the third surface 141 and the fourth surface 142 are arranged in parallel;
and/or an included angle between the optical axis of the light source 110 and the third surface 141 or the fourth surface 142 ranges from 44 degrees to 46 degrees.
Since the collimated light emitted from the laser ranging system 100 may be reflected to form reflected return light when it is irradiated on a target object, when an optical path coaxial with the emitted light in the reflected return light returns to the inside of the light source 110, the light source 110 may be damaged due to the focusing of the lens, which affects the working stability of the light source 110, and therefore, a corresponding optical element needs to be arranged to reflect the reflected light.
In the present embodiment, the reflected back light is reflected by the second optical element 140, reflected and focused on the photo-sensing chip 130; the third surface 141 and the fourth surface 142 of the second optical element 140 are both planar, and the third surface 141 and the fourth surface 142 are arranged in parallel, so that the light transmittance of the second optical element 140 is increased, and the change of the emitting angle of the emitted light is avoided, so as to reduce the reflection of the emitted light of the light source 110 when the emitted light passes through the second optical element 140.
Specifically, an included angle between the optical axis of the light source 110 and the third surface 141 or the fourth surface 142 ranges from 44 degrees to 46 degrees, and when the reflected back light reflected by the target is converged by the second aspheric region 1222 of the first optical element 120 and then irradiates the second optical element 140 disposed at an angle with respect to the optical axis, the fourth surface 142 of the second optical element 140 reflects and focuses the reflected back light on the photosensitive chip 130.
In one embodiment, a first portion of the first optical element 120 is located on an optical axis of the light source 110; and/or, when the first optical element 120 includes the first surface 121 and the second surface 122, and the second surface 122 includes the first aspheric region 1221 and the second aspheric region 1222, a ratio of a surface area of the second aspheric region 1222 to a surface area of the first aspheric region 1221 ranges from 4.
In this embodiment, the first portion of the first optical element 120 includes the first aspheric region 1221 and the corresponding first surface 121, and when the first portion is located on the optical axis of the light source 110, the emitted light emitted from the light source 110 can be collimated by the first portion along a straight line to be emitted as collimated light toward the target object.
And, the ratio of the surface area of the second aspheric region 1222 to the surface area of the first aspheric region 1221 is in the range of 4 to 1, the second aspheric region 1222 is disposed around the first aspheric region 1221, since the reflected back light formed by the collimated light reflected by the target has a certain degree of divergence, when the reflected back light enters the first optical element 120, the surface area of the second aspheric region 1222 is much larger than the surface area of the first aspheric region, the second aspheric region 1222 is used as a main reflected back light receiving region, that is, the reflected back light received by the second aspheric region 1222 is a main reflected back light, and the light sensing chip 130 is disposed according to the position of the focus point of the reflected back light of the second aspheric region 1222.
Referring to fig. 5 to 10, in one embodiment, a laser ranging apparatus 200 is further provided, including:
a mounting base 210; and
a laser ranging system 100 disposed in the mounting base 210, wherein the laser ranging system 100 is the laser ranging system 100 according to any one of the embodiments;
wherein the mount 210 includes:
a light inlet 211 for installing a light source module 220, wherein the light source module 220 includes the light source 110;
a light exit 212, disposed opposite to the light entrance 211, for disposing a lens module 230, where the lens module 230 includes the first optical element 120;
the accommodating cavity 213 is disposed between the light inlet 211 and the light outlet 212, and is used for disposing the reflective module 240, where the reflective module 240 includes the second optical element 140; and
the reflective light receiving opening 214 is used for disposing the photosensitive chip 130, the second optical element 140 divides the accommodating cavity 213 into a first cavity 2131 and a second cavity 2132 at an interval, the light inlet 211 is located in the first cavity 2131, and the light outlet 212 is located in the second cavity 2132.
In the present embodiment, the laser ranging apparatus 200 includes a mounting base 210 and a laser ranging system 100 disposed in the mounting base 210; the mounting base 210 includes a light inlet 211 and a light outlet 212 opposite to the light inlet 211, a light source module 220 including a light source 110 is disposed in the light inlet 211, and the light source module 220 is used for emitting light outwards. Go out at light-emitting port 212 and set up lens module 230 including first optical element 120 to fix first optical element 120 in going into light-emitting port 211 through the lens clamping ring, lens module 230 is used for collimating the emitted light that light source module 220 jetted out simultaneously and forms collimated light, and receives the back reflection light and will reflect back light and converge and form the focus facula. The mounting base 210 further includes a receiving cavity 213 disposed between the light inlet 211 and the light outlet 212, the receiving cavity 213 is used for disposing a reflection module 240 including the second optical element 140, the reflection module 240 divides the receiving cavity 213 into a first cavity 2131 and a second cavity 2132 at intervals, the light inlet 211 is disposed in the first cavity 2131, the light outlet 212 is disposed in the second cavity 2132, and the reflection module 240 is used for reflecting the reflected light to the reflected light receiving port 214 in the mounting base 210, a photosensitive chip 130 is disposed in the reflected light receiving port 214, a focal spot formed by converging the reflected light falls on the photosensitive chip 130, the photosensitive chip 130 converts an obtained optical pulse signal of the reflected light into an electrical signal, and obtains time information corresponding to the electrical signal based on comparison, so as to obtain distance information between the laser ranging system 100 and a target object, thereby completing ranging.
Referring to fig. 5, 9-10, in one embodiment, the light source module 220 further includes: the sleeve 221 is sleeved outside the light source 110, and the light emitting end of the light source 110 is exposed outside the sleeve 221;
the mounting plate 222 is fixed to the light inlet 211 of the mounting base 210, a first mounting hole 2221 is formed in the mounting plate 222, and the sleeve 221 is disposed through the first mounting hole 2221 of the mounting plate 222 so that the light outlet end of the light source 110 extends into the first cavity 2131 of the accommodating cavity 213.
In this embodiment, during assembly of the light source module 220, the sleeve 221 is firstly sleeved on the outer side of the light source 110, so that the light emitting end of the light source 110 is exposed on the outer side of the sleeve 221, and then the sleeve 221 passes through the first mounting hole 2221 of the mounting plate 222 fixed on the light inlet 211 of the mounting base 210, so that the light emitting end of the light source 110 extends into the first cavity 2131 of the accommodating cavity 213.
Referring to fig. 5, in one embodiment, the light source module 220 further includes an adjusting component 250, the adjusting component 250 surrounds one end of the sleeve 221 corresponding to the light-emitting end of the light source 110 and is fixed on the mounting plate 222; the adjusting assembly 250 includes an adjusting slider 251, a bracket 252 and a bottom plate 253, wherein the adjusting slider 251 is sleeved on one end of the sleeve 221 corresponding to the light emitting end of the light source 110, the bracket 252 is disposed around the adjusting slider 251, and the bottom plate 253 is used for fixing the bracket 252 and the adjusting slider 251 on the mounting plate 222.
In the normal assembling process of the light source module 220, due to the processing deviation and the installation deviation, the optical axis of the light source 110 and the optical axis of the first optical element 120 or the second optical element 140 may not be in the same line, which affects the distance detection of the laser distance measuring device 200 to the target object.
In this embodiment, the adjusting assembly 250 in the light source module 220 includes an adjusting slider 251, a bracket 252 and a bottom plate 253, the adjusting slider 251 has a through hole for receiving the sleeve 221, one end of the sleeve 221 corresponding to the light emitting end of the light source 110 is received in the through hole of the adjusting slider 251, the optical axis of the light source 110 in the sleeve 221 and the optical axis of the first optical element 120 or the second optical element 140 are aligned on the same line by the rotation of the sleeve 221 in the through hole and the movement in the front-back direction, the bracket 252 is disposed around the adjusting slider 251, and the bottom plate 253 is used for fixing the adjusting slider 251 and the bracket 252 on the mounting plate 222. The top of the adjusting slider 251 has an adjusting screw hole corresponding to the through hole, the bracket 252 has an avoidance vacancy at a position corresponding to the adjusting screw hole, and a screw is disposed in the adjusting screw hole to fix the position of the sleeve 221, thereby fixing the position of the light source 110.
In one embodiment, the reflective module 240 includes a positioning plate 241, the positioning plate 241 is disposed in the accommodating cavity 213, a second mounting hole 2411 is disposed inside the positioning plate 241, and the second optical element 140 is fixed in the second mounting hole 2411.
In the present embodiment, the second optical element 140 is disposed in the second mounting hole 2411 of the positioning plate 241, and the positioning plate 241 is mounted in the accommodating cavity 213 at a predetermined angle, so that the second optical element 140 is disposed at a limited inclination angle, and the irradiation direction of the reflected back light is changed.
Referring to fig. 5 and 10, in one embodiment, the accommodating cavity 213 has a first step portion 2133 and a second step portion inside, the first step portion 2133 and the second step portion are disposed obliquely to the optical axis of the light source 110, and the positioning plate 241 abuts against the first step portion 2133 and the second step portion.
During the mounting process, since the second optical element 140 is disposed in the second mounting hole 2411 of the positioning plate 241, since the mounting position and the mounting angle of the second mounting plate 222 determine the specific position of the second optical element 140, a corresponding structure needs to be disposed inside the accommodating cavity 213 to position and fix the positioning plate 241.
In this embodiment, the second optical element 140 can vertically reflect and focus the reflected light onto the photo sensor chip 130 by disposing the first step portion 2133 and a second step portion (not shown) in the accommodating cavity 213, wherein the second step portion has the same structure as the first step portion 2133 and is disposed on the other side of the accommodating cavity 213 opposite to the first step portion 2133, and the inclination angle is between 44 degrees and 46 degrees, preferably 45 degrees. The mounting position and the inclination angle of the positioning plate 241 can be limited by the first step portion 2133 and the second step portion, so that the positioning plate 241 is accurately aligned in the mounting process, and the second optical element 140 is arranged at a fixed position.
Referring to fig. 5 to 7, in one embodiment, the reflective module 240 further includes a cover plate 242, the cover plate 242 and the second optical element 140 are respectively disposed at two sides of the positioning plate 241, a through hole 2421 is disposed inside the cover plate 242, the through hole 2421 of the cover plate 242 is located on the optical axis of the light source 110, and the through hole 2421 of the cover plate 242 is a long strip through hole.
In the present embodiment, by disposing the cover plate 242 on the other side of the positioning plate 241 opposite to the second optical element 140, and the through hole 2421 of the cover plate 242 is located on the optical axis of the light source 110, the emitted light emitted by the light source 110 passes through the through hole 2421 of the cover plate 242 and enters the second optical element 140, and is emitted from the fourth region 1422 of the fourth surface 142 of the second optical element 140. And the cover plate 242 can be used to enhance the covering surface for the reflected light to prevent the reflected light from being reflected back into the light source 110 and damaging the light source 110.
Referring to fig. 10 and 11, in one embodiment, the optical module further includes an extinction member 260, the extinction member 260 is disposed on the reflected light receiving opening 214, a light guide path 261 is formed inside the extinction member 260, a diameter of the light guide path 261 gradually decreases along a direction away from the second optical element 140, and extinction grooves are formed on a side wall of the light guide path 261.
In addition to the reflected back light reflected by the target object irradiated by the collimated light emitted from the light source 110, the reflected back light received and condensed by the first optical element 120 and the second optical element 140 may also include ambient diffuse reflected light and reflected back light irradiated by the other light source 110, and if these additional reflected back lights enter the detector, the accuracy of the optical sensor chip 130 may be affected.
In the embodiment, the top view direction of the second optical element 140 is perpendicular to the optical axis of the light source 110, and the light extinction member 260 is located directly below the third region 1421 of the second optical element 140 along the top view direction of the second optical element 140. The extinction member 260 is internally formed with a light guide path 261, the diameter of the light guide path 261 gradually decreases in a direction away from the second optical element 140, and extinction grooves are formed on the side wall of the light guide path 261. Unnecessary environment diffuse reflection light and the like in the reflected return light are absorbed by the extinction marks, and the detection accuracy of the photosensitive chip 130 is improved.
In one embodiment, the first surface 121 of the first optical element 120 is a plane, the optical axes of the first aspheric surface area 1221 and the second aspheric surface area 1222 are on the same line, and the curved surfaces of the first aspheric surface area 1221 and the second aspheric surface area 1222 have a radius of curvature gradually increasing from the center to the edge of the surface; the maximum radius of curvature of the curved surface of the first aspherical region 1221 is smaller than the minimum radius of curvature of the curved surface of the second aspherical region 1222. And/or the ratio of the surface area of the second aspheric surface region 1222 to the surface area of the first aspheric surface region 1221 is in the range of 4.
A spherical lens refers to a lens having a constant curvature from the center to the edge of the lens, and spherical aberration easily generated in a collimating and focusing system, that is, light rays converge to different points, resulting in image blur.
In this embodiment, the first optical element 120 includes a first aspheric area 1221 and a second aspheric area 1222 which are coaxial and correspond to two aspheric lenses, and the curvature radius of the curved surface of the aspheric lens gradually increases from the center to the edge of the surface, so as to eliminate spherical aberration to the maximum extent, i.e. to converge light to the same point, and provide collimated light with better optical quality.
And the optical axes of the first aspheric area 1221 and the second aspheric area 1222 are aligned, so that the emitted light can be reflected along the same path without additional adjustment by aligning the emitted light path during installation.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, which are directly or indirectly applied to the present invention, are included in the scope of the present invention.
Claims (12)
1. A laser ranging system, comprising:
a light source;
a first optical element including a first portion for converting emission light of the light source into collimated light and a second portion for condensing reflected back light after the collimated light is reflected by a target, a focal length of the first portion being different from a focal length of the second portion;
the photosensitive chip is used for receiving the reflected return light and outputting measurement data;
a second optical element disposed between the light source and the first optical element; and
the beam expander is embedded in the second optical element and penetrates through the second optical element, the optical axis of the beam expander and the optical axis of the light source are on the same straight line, emitted light emitted by the light source passes through the beam expander and is incident into the first optical element, and the second optical element reflects the reflected light to the photosensitive chip;
the first optical element includes a first surface and a second surface, the emitted light is incident from the first surface of the first optical element and exits from the second surface of the first optical element, the second surface includes a first aspheric surface region and a second aspheric surface region, the first aspheric surface region and the corresponding first surface constitute the first portion, the second aspheric surface region and the corresponding first surface constitute the second portion; the optical axes of the first part and the second part of the first optical element are on the same straight line, and the optical axes of the first aspheric surface area and the second aspheric surface area are on the same straight line;
the second aspheric surface region is disposed around the first aspheric surface region; the focal length of the second aspheric surface area is larger than the focal length of the first aspheric surface area.
2. The laser ranging system according to claim 1, wherein the second optical element comprises a third surface and a fourth surface, the light source emits an incident light from the third surface of the second optical element and an exit light from the fourth surface of the second optical element, and the reflected return light converged by the first optical element is reflected by the fourth surface of the second optical element and then output to the light sensing chip.
3. The laser ranging system according to claim 2, wherein the fourth surface includes a third area and a fourth area, the beam expander penetrates through the third area, the fourth area is disposed around the third area, the emitted light from the light source passes through the third area of the second optical element and is incident on the first surface of the first optical element, and the reflected light condensed by the first optical element is reflected by the fourth area of the fourth surface and is output to the photosensitive chip.
4. The laser ranging system according to claim 3, wherein the third surface is coated with a first optical film, the third area is coated with a first optical film, and the fourth area is coated with a second optical film.
5. The laser ranging system of claim 4, wherein the first optical film comprises an anti-reflective film;
and/or the second optical film comprises any one of a reflecting film and a semi-reflecting film.
6. The laser ranging system of claim 1, wherein the beam expander comprises an input portion and an output portion, the input portion facing the light source and extending out of the second optical element, the output portion facing the first optical element and extending out of the second optical element;
and/or the first optical element and the second optical element are integrally formed by adopting a glass hot-pressing process.
7. The laser ranging system according to claim 6, wherein an optical axis of the light source and an optical axis of the first optical element are located on the same axis;
and/or, when the second optical element comprises a third surface and a fourth surface, and the fourth surface comprises a third area and a fourth area, the center point of the third area is located on the optical axis of the light source or the first optical element.
8. The laser ranging system of claim 7, wherein the third surface and the fourth surface are planar;
and/or the third surface and the fourth surface are arranged in parallel;
and/or an included angle between an optical axis of the light source and the third surface or the fourth surface ranges from 44 degrees to 46 degrees.
9. The laser ranging system of claim 6,
a first portion of the first optical element is located on an optical axis of the light source;
and/or, when the first optical element includes a first surface and a second surface, and the second surface includes a first aspheric region and a second aspheric region, a ratio of a surface area of the second aspheric region to a surface area of the first aspheric region ranges from 4 to 5.
10. A laser ranging device, comprising:
a mounting seat; and
a laser ranging system arranged in the mounting seat, wherein the laser ranging system is the laser ranging system as claimed in any one of claims 1 to 9;
wherein, the mount pad includes:
the light inlet is used for arranging a light source module, and the light source module comprises the light source;
the light outlet is arranged opposite to the light inlet and is used for arranging a lens module, and the lens module comprises the first optical element;
the accommodating cavity is arranged between the light inlet and the light outlet and used for arranging a reflection module, and the reflection module comprises the second optical element; and
and the reflected light receiving port is used for arranging the photosensitive chip.
11. The laser ranging device as claimed in claim 10, wherein the light source module further comprises:
the sleeve is sleeved on the outer side of the light source, and the light-emitting end of the light source is exposed on the outer side of the sleeve;
the mounting plate is fixed on the light inlet of the mounting seat, a first mounting hole is formed in the mounting plate, and the sleeve penetrates through the first mounting hole of the mounting plate so that the light outlet end of the light source extends into the first cavity of the accommodating cavity;
and the adjusting component surrounds one end of the sleeve, which corresponds to the light emitting end of the light source, and is fixed on the mounting plate.
12. The laser ranging device according to claim 10, wherein the reflection module comprises a positioning plate disposed in the receiving cavity, a second mounting hole is disposed inside the positioning plate, and the second optical element is fixed in the second mounting hole;
the cover plate and the second optical element are respectively arranged on two sides of the positioning plate, a through hole is formed in the cover plate, the through hole of the cover plate is positioned on the optical axis of the light source, and the through hole of the cover plate is a long-strip-shaped through hole; and
the extinction piece is arranged on the reflected light receiving opening, a light guide path is formed in the extinction piece, the diameter of the light guide path is gradually reduced along the direction far away from the second optical element, and extinction grains are formed on the side wall of the light guide path.
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