CN110596674A - Swing mirror, driving method thereof and laser radar - Google Patents

Swing mirror, driving method thereof and laser radar Download PDF

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Publication number
CN110596674A
CN110596674A CN201910758380.8A CN201910758380A CN110596674A CN 110596674 A CN110596674 A CN 110596674A CN 201910758380 A CN201910758380 A CN 201910758380A CN 110596674 A CN110596674 A CN 110596674A
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CN
China
Prior art keywords
swing
sheet
limiting groove
mirror
state
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Granted
Application number
CN201910758380.8A
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Chinese (zh)
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CN110596674B (en
Inventor
陈杰
向少卿
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Hesai Technology Co Ltd
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Hesai Photonics Technology Co Ltd
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Priority to CN201910758380.8A priority Critical patent/CN110596674B/en
Publication of CN110596674A publication Critical patent/CN110596674A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4814—Constructional features, e.g. arrangements of optical elements of transmitters alone
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4817—Constructional features, e.g. arrangements of optical elements relating to scanning
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/10—Scanning systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/10—Scanning systems
    • G02B26/101—Scanning systems with both horizontal and vertical deflecting means, e.g. raster or XY scanners

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Optics & Photonics (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Abstract

The invention discloses a swing mirror for deflecting incident beams, a driving method of the swing mirror, a laser radar and a transmitting device thereof, wherein the swing mirror comprises: the device comprises a shell, a first limiting groove and a second limiting groove are respectively arranged on the inner sides of the top and the bottom of the shell, the extending directions of the first limiting groove and the second limiting groove are parallel to the reflecting surface of the swing mirror, and the stroke width of at least one of the first limiting groove and the second limiting groove in the front-back direction of the shell is not zero; the top end and the bottom end of the sheet-shaped swinging component are respectively clamped in the first limiting groove and the second limiting groove, the front surface of the sheet-shaped swinging component is provided with a reflecting surface, and the reflecting surface is used for deflecting the incident light beam; the driving part is suitable for driving the sheet-shaped swinging part to swing in the shell, the scheme is adopted, the number of lasers in the laser radar can be effectively reduced, the cost is reduced, the structure is simplified, and the installation difficulty is reduced.

Description

Swing mirror, driving method thereof and laser radar
Technical Field
The invention relates to the technical field of laser radars, in particular to a swing mirror for deflecting an incident beam, a driving method of the swing mirror, a laser radar and a transmitting device of the laser radar.
Background
The unmanned automobile is an intelligent automobile which senses road environment through a vehicle-mounted sensing system, automatically plans a driving route and controls the automobile to reach a preset target. The vehicle-mounted sensor is used for sensing the surrounding environment of the vehicle, and controlling the steering and the speed of the vehicle according to the road, the vehicle position and the obstacle information obtained by sensing, so that the vehicle can safely and reliably run on the road.
The in-vehicle sensor is an in-vehicle device necessary to implement the unmanned automobile. The laser radar has the characteristics of long detection distance, high resolution, small environmental interference and the like, and is indispensable vehicle-mounted equipment of the unmanned automobile. The operating principle of lidar is roughly as follows: laser radar's transmitter launches a bundle of laser, and after laser beam met the object, through diffuse reflection, returned to laser receiver, radar module multiplies the velocity of light according to the time interval of sending and received signal, divides by 2 again, can calculate the distance of transmitter and object. In addition to range information, the lidar may also acquire other information of the target object, such as orientation, velocity, size, shape, reflectivity, etc.
Early lidar was a single line lidar, i.e., having only one laser and detector, which scanned a limited range of targets, and was prone to loss of detected targets. To compensate for the shortcomings of the single line lidar, the multiline lidar is becoming the focus of research and commercial use.
However, the existing multi-line laser radar often has the problems of high cost and overlarge energy consumption.
The statements in the background section are merely prior art as they are known to the inventors and do not, of course, represent prior art in the field.
Disclosure of Invention
In view of at least one of the drawbacks of the prior art, the present invention proposes a swing mirror for deflecting an incident light beam, said swing mirror comprising:
the inner sides of the top and the bottom of the shell are respectively provided with a first limiting groove and a second limiting groove, the extending directions of the first limiting groove and the second limiting groove are parallel to the reflecting surface of the swing mirror, and the stroke width of at least one of the first limiting groove and the second limiting groove in the front-back direction of the shell is not zero;
the top end and the bottom end of the sheet-shaped swinging component are respectively clamped in the first limiting groove and the second limiting groove, the front surface of the sheet-shaped swinging component is provided with a reflecting surface, and the reflecting surface is used for deflecting the incident light beam;
and the driving component is suitable for driving the sheet-shaped swinging component to swing in the shell.
Optionally, the stroke widths of the first limiting groove and the second limiting groove in the front-back direction of the housing are not zero.
Optionally, the drive component comprises:
the first magnetic component is arranged on the sheet-shaped swinging component and is close to the top end of the sheet-shaped swinging component;
the second magnetic component is arranged on the sheet-shaped swinging component and is close to the bottom end of the sheet-shaped swinging component;
the first driving device is fixedly arranged in the shell, is opposite to the first magnetic part and is arranged at intervals, and is arranged to be capable of pushing and pulling the first magnetic part under the driving of a first driving signal so as to drive the top end of the sheet-shaped swinging part to swing in the first limiting groove;
and the second driving device is fixedly arranged in the shell, is opposite to the second magnetic part and is arranged at intervals, and is arranged to be capable of pushing and pulling the second magnetic part under the driving of a second driving signal so as to drive the bottom end of the sheet-shaped swinging part to swing in the second limiting groove.
Optionally, the stroke width of the first limiting groove is different from the stroke width of the second limiting groove.
Optionally, the sheet-like swinging member has four swinging states including:
in a first swinging state, the first driving device pushes the top end of the sheet-shaped swinging component to be abutted with the front flange of the first limiting groove, and the second driving device pushes the bottom end of the sheet-shaped swinging component to be abutted with the front flange of the second limiting groove;
in a second swinging state, the first driving device pushes the top end of the sheet-shaped swinging component to be abutted with the front flange of the first limiting groove, and the second driving device pulls the bottom end of the sheet-shaped swinging component to be abutted with the rear flange of the second limiting groove;
in a third swinging state, the first driving device pulls the top end of the sheet-shaped swinging component to be abutted against the rear flange of the first limiting groove, and the second driving device pulls the bottom end of the sheet-shaped swinging component to be abutted against the rear flange of the second limiting groove;
in a fourth swinging state, the first driving device pulls the top end of the sheet-shaped swinging component to be abutted against the rear flange of the first limiting groove, and the second driving device pushes the bottom end of the sheet-shaped swinging component to be abutted against the front flange of the second limiting groove.
Alternatively, the sheet-like swing member is sequentially driven cyclically in the order of the first swing state, the second swing state, the third swing state, the fourth swing state, and returning to the first swing state.
Optionally, the stroke width of the first limiting groove is n times of the stroke width of the second limiting groove, or the stroke width of the second limiting groove is n times of the stroke width of the first limiting groove, where n is a natural number greater than 1.
Optionally, a plane formed by a center line of the first limiting groove and a center line of the second limiting groove is parallel to the reflecting surface of the swing mirror.
Optionally, the swing mirror further comprises:
one end of the elastic component is fixedly connected inside the shell, the other end of the elastic component abuts against the rear surface of the sheet-shaped swinging component, and the elastic component is used for suspending the sheet-shaped swinging component so that the sheet-shaped swinging component can translate back and forth or rotate in the pitching direction.
Optionally, inside of the first limit groove and inside of the second limit groove are respectively provided with a buffer bush.
Optionally, the first driving device is a first electromagnetic coil configured to be driven by an electric current to push or pull the first magnetic member;
the second driving device is a second electromagnetic coil that is provided so as to be able to push and pull the second magnetic member by current driving.
Optionally, a reflector is attached to a front surface of the sheet-shaped swinging component, and the reflector is used for deflecting the incident light beam.
The embodiment of the invention provides a transmitting device of a laser radar, which comprises:
the optical transmitter comprises at least one optical transmitter, a light source and a light source, wherein the optical transmitter is used for transmitting a detection light beam, the optical transmitters are arranged along the vertical direction, and the detection light beam transmitted by each optical transmitter has different vertical field angles;
the oscillating mirror according to any one of the above embodiments, configured to deflect the incident probe beam, where the oscillating mirror is capable of performing pitching oscillation in the vertical direction, so as to change the vertical field angle of the probe beam to achieve scanning of the probe beam in the vertical direction;
the emission lens assembly is used for collimating the detection light beam deflected by the swing mirror;
the rotating mirror is fixed on the rotor and rotates around a rotating shaft of the rotor, wherein the rotating shaft is arranged along the vertical direction, the rotating mirror is provided with M reflecting surfaces and is synchronous with the swinging mirror, the rotating mirror is used for reflecting the detection light beams to a space to be detected, and therefore the scanning of the detection light beams in the horizontal direction is achieved, and M is a positive integer greater than or equal to 2.
An embodiment of the present invention provides a laser radar, including: the launch device of any of the above; the optical receiver is used for receiving an echo light beam, and the echo light beam is formed after the emitted light beam is reflected by a target in the space to be measured;
and the control device is provided with at least one processor and is used for controlling the synchronization between the swing mirror and the rotating mirror and calculating the distance between the target in the space to be measured and the laser radar according to the time interval between the emission time of the detection light beam and the receiving time of the echo light beam.
The embodiment of the invention provides a driving method of a swing mirror, which comprises the following steps: applying a driving signal to the driving member to drive the sheet-like swing member to swing within the housing.
Optionally, comprising:
applying a first drive signal to the first drive device;
and applying a second driving signal to a second driving device to drive the sheet-shaped swinging component to be switched among the first swinging state, the second swinging state, the third swinging state and the fourth swinging state.
Optionally, the driving method includes:
adjusting the first driving signal to drive the top end of the sheet-shaped swinging component to move to the front or rear flange of the first limit groove firstly in an accelerating way and then in a decelerating way; and/or the presence of a gas in the gas,
and adjusting the second driving signal to drive the top end of the sheet-shaped swinging component to move to the front or rear flange of the second limit groove firstly in an accelerating way and then in a decelerating way.
Optionally, the first driving signal and the second driving signal are applied in a time-sharing manner to drive the sheet-shaped swinging component to sequentially and circularly switch according to the sequence of the first swinging state, the second swinging state, the third swinging state, the fourth swinging state and then return to the first swinging state, or select a part of states to switch.
Compared with the prior art, the technical scheme of the invention has the following advantages:
because the slice swing part in the swing mirror can swing within this first spacing groove and this second spacing groove, the stroke width of first spacing groove and this second spacing groove is different, so the top of slice swing part and the different combination of bottom swing position correspond and form multiple different swing states, and then correspond multiple inclination different with the vertical direction, thereby can form four detection light beams that the angle of view is different perpendicularly with a beam of incident light deflection, thereby can effectively reduce the quantity of laser instrument among the laser radar, reach reduce cost, the purpose of simplifying the structure and reducing the installation degree of difficulty.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a swing mirror according to an embodiment of the present invention;
FIG. 2 shows a schematic structural diagram of another swing mirror in an embodiment of the present invention;
FIG. 3 shows a schematic structural diagram of another swing mirror in an embodiment of the present invention;
fig. 3A to fig. 3D are schematic diagrams illustrating a swing mirror in a first swing state, a second swing state, a third swing state and a fourth swing state, respectively, according to an embodiment of the present invention;
3 a-3 d are schematic diagrams respectively illustrating the corresponding inclination angles of a swing mirror in a first swing state, a second swing state, a third swing state and a fourth swing state in the embodiment of the present invention; fig. 4A is a schematic side view showing a structure of a transmitting apparatus of a lidar in an embodiment of the present invention;
fig. 4B is a plan view showing the structure of a transmitting device of a lidar in an embodiment of the present invention;
fig. 4C is a schematic side view showing the structure of another lidar transmission apparatus in an embodiment of the present invention;
fig. 4D is a schematic side view showing the structure of a transmitting apparatus of a lidar in an embodiment of the present invention;
fig. 4E is a schematic side view showing the structure of a transmitting apparatus of a lidar in an embodiment of the present invention;
fig. 4F is a schematic side view showing the structure of another lidar transmission apparatus in an embodiment of the present invention;
FIG. 5 is a schematic diagram of a lidar constructed in an embodiment of the invention;
FIG. 6 shows a schematic diagram of another lidar in an embodiment of the invention;
FIG. 7 is a schematic diagram of a scanning trajectory of a lidar in an embodiment of the invention;
FIG. 8 is a schematic diagram of a scanning trajectory of a lidar in an embodiment of the present invention;
fig. 9 shows a scanning trajectory diagram of a lidar in an embodiment of the invention.
Detailed Description
In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.
As known from the background art, the multi-line laser radar in the prior art has the problems of high cost and excessive energy consumption.
In the conventional multi-line laser radar, a plurality of lasers and corresponding detectors are arranged in the vertical direction to increase the detection range in the vertical direction and the vertical field angle resolution. However, each detection channel needs one laser, and one detection channel includes one laser, that is, the number of lasers included in the laser radar is quite large, so that the cost of the laser radar is high, and the problems of complex internal structure and high installation difficulty are caused.
In order to solve the technical problem, the embodiment of the invention provides the swing mirror capable of generating various different swing states, so that various different deflection inclination angles are correspondingly generated, and accordingly, each deflection inclination angle can enable laser to cover different view fields, so that the number of lasers in a laser radar can be effectively reduced, and the purposes of reducing cost, simplifying structure and reducing installation difficulty are achieved.
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Fig. 1 shows a schematic structural diagram of a swing mirror for deflecting an incident light beam in an embodiment of the present invention, as can be seen with reference to fig. 1, the swing mirror includes: a housing 10, a sheet-like swinging member 11, and a driving member 14. For the sake of clarity, a relatively long side or a side of the housing 10 is selected to measure the height of the housing 10, the extending direction of the height of the housing 10 is referred to as the height direction, the arrow in the height direction in fig. 1 points to the upper part or the top end or the top part of the height direction, and the arrow in the opposite direction points to the lower part or the bottom end or the bottom part of the height direction; the other side or side of the housing 10 with the shortest relative dimension is selected to measure the depth or thickness of the housing 10, and the extension direction of the housing 10 in the depth or thickness is referred to as the front-back direction, the arrow in the front-back direction in fig. 1 points to the front or front end or front of the front-back direction, and the arrow in the reverse direction points to the rear or rear end or rear of the front-back direction. Of course, in the specific implementation, the person skilled in the art can adjust the above definition of the orientation direction according to the use scenario and the assembly requirement, and the examples herein are not intended to limit the scope of the present application.
In order to facilitate the installation of the sheet-shaped swinging member 11, a first limiting groove 12 and a second limiting groove 13 are respectively disposed on the inner sides of the top (upper portion in the height direction) and the bottom (lower portion in the height direction) of the housing 10, the extending directions of the stroke widths of the first limiting groove 12 and the second limiting groove 13 are parallel to the reflecting surface 110 of the swinging mirror, and correspondingly, the top end 111 and the bottom end 112 of the sheet-shaped swinging member 11 are respectively clamped in the first limiting groove 12 and the second limiting groove 13.
In specific implementation, two materials, namely metal (such as high-strength alloy) and nonmetal, or only nonmetal, can be adopted as the materials of the first limiting groove 12 and the second limiting groove 13, so that the accuracy and the long-term stability of the limiting grooves can be improved. In production, the first limiting groove 12 and the second limiting groove 13 can be manufactured by processing the raw materials by milling and other processes.
Note that, since there is a concept of a stroke if the end portion (the top end 111 and/or the bottom end 112) of the sheet-like swing member 11 can move in the front-rear direction in the stopper groove, the stroke width here is defined by the movement of the end portion (the top end 111 and/or the bottom end 112) of the sheet-like swing member 11.
In specific implementation, the stroke width of at least one of the first limiting groove 12 and the second limiting groove 13 in the front-back direction of the housing 10 is not zero, which specifically includes the following three cases: the stroke width of the first limiting groove 12 in the front-back direction is zero, and the stroke width of the second limiting groove 13 in the front-back direction is not zero; the stroke width of the first limiting groove 12 in the front-back direction is not zero, and the stroke width of the second limiting groove 13 in the front-back direction is zero; the stroke width of the first stopper groove 12 in the front-rear direction is not zero, and the stroke width of the second stopper groove 13 in the front-rear direction is also not zero. However, if the stroke width of the limiting groove in the front-rear direction of the housing 10 is zero, it means that the corresponding end of the sheet-like swinging member 11 cannot move in the limiting groove in the front-rear direction of the housing 10, that is, the thickness of the corresponding end of the sheet-like swinging member 11 in the front-rear direction is approximately equal to the depth of the corresponding limiting groove in the front-rear direction.
For example, as shown in fig. 1, the stroke width of the first limiting groove 12 in the front-back direction of the housing 10 is zero (the thickness of the sheet-shaped swinging member 11 is approximately equal to the depth of the first limiting groove 12), the top end 111 of the sheet-shaped swinging member 11 is directly and fixedly engaged in the first limiting groove 12, and the top end 111 of the sheet-shaped swinging member 11 can swing in the first limiting groove 12 but cannot move in the first limiting groove 12 in the front-back direction. The stroke width of the second limiting groove 13 in the front-back direction of the housing 10 is not zero (the thickness of the sheet-shaped swing member 11 is smaller than the depth of the second limiting groove 13), the leftmost side of the second limiting groove 13 is a left end a, and the rightmost side is a right end B, so that the bottom end 112 of the sheet-shaped swing member 11 is clamped in the second limiting groove 13, but the bottom end 112 of the sheet-shaped swing member 11 can move in the second limiting groove 13 in a position along the front-back direction, for example, the bottom end 112 of the sheet-shaped swing member 11 can move from the left end a to the right end B.
In order to realize the swing of the sheet-like swing member 11 in the housing 10, the end portion (the top end 111 and/or the bottom end 112) of the sheet-like swing member 11 may be driven by the driving member 14 to move in the front-rear direction in the stopper groove (the first stopper groove 12 and/or the second stopper groove 13).
In addition, in an embodiment of the present invention, the front surface of the plate-shaped swinging member 11 has a reflection surface 110, and the reflection surface 110 can be used for deflecting the incident light beam. Of course, in another embodiment, a mirror may be attached to the front surface of the sheet-like oscillating member 11, and the mirror may be used to deflect the incident light beam. It can be understood that when the sheet-like swinging component 11 swings in the first limiting groove 12 and/or the second limiting groove 13, the top end 111 and the bottom end 112 of the sheet-like swinging component 11 are located at different positions at different times, so as to generate different combinations of swinging positions, and the sheet-like swinging component 11 drives the reflecting surface 110 or the reflecting mirror to generate different inclination angles relative to the vertical direction of the radar. For example, at time t1, the top end 111 of the sheet-like swinging member 11 is at point a1 (not shown), the bottom end 112 is at point b1 (not shown), and the angle between the reflection surface 110 or the mirror and the vertical direction is α 1; at time t2, the top end 111 of the sheet-like swinging member 11 is at point a2 (not shown), the bottom end 112 is at point b2 (not shown), and the angle between the reflection surface 110 or the mirror and the vertical direction of the laser radar is α 2 ≠ α 1. Therefore, the swing mirror in the application can deflect one incident beam to form a plurality of detection beams with different vertical field angles, so that the number of lasers in the laser radar can be effectively reduced, and the purposes of reducing cost, simplifying structure and reducing installation difficulty are achieved.
In order to deflect one incident light beam to form more probe light beams with different vertical field angles, in a specific implementation, the stroke widths of the first limiting groove and the second limiting groove in the front-back direction of the housing may be different from zero. Fig. 2 shows a schematic structural diagram of another oscillating mirror in an embodiment of the present invention, in fig. 2, the stroke widths of the first limiting groove 22 and the second limiting groove 23 in the front-back direction of the housing 10 are the same and are not zero, and the driving component is divided into two sub-components, which are respectively used for independently driving the top end 111 and the bottom end 112 of the sheet oscillating component.
As can be seen with reference to fig. 2, the driving part comprises: a first magnetic member 141, a second magnetic member 142, a first driving device 143, and a second driving device 144. In detail, the first magnetic member 141 is attached to the sheet-shaped swinging member and is relatively closer to the top end 111 of the sheet-shaped swinging member, the first driving device 143 is fixedly disposed inside the housing 10 and is opposite to and spaced from the first magnetic member 141, and when the first driving signal is applied to the first driving device 143, the first driving device 143 and the first magnetic member 141 generate an acting force therebetween, and the acting force is represented as that the first driving device 143 pushes and pulls the first magnetic member 141 in the front-back direction of the housing 10, so as to drive the top end 111 of the sheet-shaped swinging member to swing or move in the first limiting groove 22. Similarly, the second magnetic component 142 is disposed on the sheet-shaped swing component at a position relatively closer to the bottom end 112, the second driving device 144 is fixedly disposed inside the housing 10 and is disposed opposite to the second magnetic component 142 at an interval, and after a second driving signal is applied to the second driving device 144, the second driving device 144 can push and pull the second magnetic component 142 and drive the bottom end 112 of the sheet-shaped swing component to swing in the second limiting groove 23.
In a specific implementation, a first electromagnetic coil may be used as the first driving device 143, a first magnetic steel may be used as the first magnetic part 141, and then the first electromagnetic coil may be configured to be driven by current to push and pull the magnetic steel; correspondingly, a second electromagnetic coil is used as the second driving device 144, and a second magnetic steel is used as the second magnetic component 142, and the second electromagnetic coil is configured to be driven by current to push and pull the second magnetic steel.
In order to further improve the ability of the oscillating mirror to deflect the incident light beam to expand the beam, in an implementation, the stroke width of the first limiting groove and the stroke width of the second limiting groove may be different. Fig. 3 is a schematic structural view illustrating another swing mirror according to an embodiment of the present invention, and in fig. 3, a stroke width of the first stopper groove 32 in the front-rear direction of the housing 30 is T1, and a stroke width of the second stopper groove 33 in the front-rear direction of the housing 30 is T2.
In addition, in order to reduce the complexity of the device and the cost of the radar, the sheet-like oscillating member 11 of the oscillating mirror in the embodiment of the present invention may have four oscillating states, and the light beam may be deflected only in the four oscillating states. Specifically, the four swing states are respectively:
in the first swing state, the first driving device 143 pushes the top end of the sheet-like swing member 11 to abut against the end of the front flange D of the first stopper groove 32, and the second driving device 144 pushes the bottom end of the sheet-like swing member 11 to abut against the end of the front flange B of the second stopper groove 33, as shown in fig. 3A.
In the second swing state, the first driving device 143 pushes the top end of the sheet-like swing member 11 to abut against the front flange D of the first stopper groove 32, and the second driving device 144 pulls the bottom end of the sheet-like swing member 11 to abut against the rear flange a of the second stopper groove 33, as shown in fig. 3B.
In the third swing state, the first driving device 143 pulls the top end of the sheet-like swing member 11 to abut against the rear flange C of the first stopper groove 32, and the second driving device 144 pulls the bottom end of the sheet-like swing member 11 to abut against the rear flange a of the second stopper groove 33, as shown in fig. 3C.
In the fourth swing state, the first driving device 143 pulls the top end of the sheet-like swing member 11 to abut against the rear flange C of the first stopper groove 32, and the second driving device 144 pushes the bottom end of the sheet-like swing member 11 to abut against the front flange B of the second stopper groove 33, as shown in fig. 3D.
In order to reduce the loss of the limiting groove when the swing states are switched, and to improve the reliability of the swing mirror, in an embodiment of the present invention, the first limiting groove 32 and/or the second limiting groove 33 may be respectively provided with a buffer bush 34 inside, so as to play a certain buffer role on the end of the sheet-shaped swing component 11. The cushion bushing 34 may be made of a relatively elastic and soft material, such as rubber. In another embodiment of the present invention, unlike the above-described embodiment in which the end (top end and/or bottom end) of the sheet-like swing member 11 is moved to the front and rear flanges of the stopper groove (the first stopper groove 32 or the second stopper groove 33) to be in the swing state, the sheet-like swing member 11 may be moved to a halfway position of the stroke width of the stopper groove to be in the swing state, and for example, when the position E is in the first stopper groove 32 and is close to the end D of the front flange, the sheet-like swing member 11 may be set in the first swing state when the top end of the sheet-like swing member 11 is at the position E and the bottom end of the sheet-like swing member 11 abuts the end B of the front flange of the second stopper groove 33.
In a specific implementation, the sheet-like oscillating member 11 is sequentially driven cyclically in the sequence of the first oscillating state, the second oscillating state, the third oscillating state, the fourth oscillating state, and returning to the first oscillating state, so that when two adjacent oscillating states are switched, only one-end (top or bottom) driving is performed, that is, either the top end of the sheet-like oscillating member 11 is driven to move or the bottom end of the sheet-like oscillating member 11 is driven to move, thereby reducing the complexity of the movement and improving the measurement accuracy of the radar.
In an embodiment of the present invention, the stroke widths of the first limiting groove 32 and the second limiting groove 33 may have a relationship of n times, where n is a natural number greater than 1. Specifically, the stroke width of the first limiting groove 32 may be n times of the stroke width of the second limiting groove 33: t1 may be n × T2, or n times the stroke width of the second limiting groove 33 as the stroke width of the first limiting groove 32: t2 ═ nxt 1. It can be understood that the size relationship between the stroke widths of the first limiting groove 32 and the second limiting groove 33 determines the included angle between the sheet-like swinging component 11 in the swinging state and the vertical direction, and thus determines the deflection size of the reflecting mirror or the reflecting surface to the light beam, and further affects the size of the vertical field of view of the radar, so that a person skilled in the art can specifically set the size of n according to actual needs, considering the size of the vertical field of view of the radar and the splitting requirement in the embodiment of the present invention. In an embodiment of the present invention, n may be 2, and T1 may be n × T2, in which case, the corresponding sheet-shaped swinging member 11 may also have 4 states, and when the sheet-shaped swinging member 11 is sequentially and cyclically switched in the order of the first swinging state, the second swinging state, the third swinging state, the fourth swinging state, and then returned to the first swinging state, the deflection angle differences between adjacent swinging states with respect to the light beam are the same, so that the light beam may be deflected relatively uniformly, and uniform detection may be achieved. For example, as shown in fig. 3a, an angle between the extending direction of the reflection surface of the sheet-like swinging member 11 in the first swinging state and the vertical direction is γ 1; as shown in fig. 3b, the angle between the extending direction of the reflection surface and the vertical direction of the sheet-like swinging member 11 in the second swinging state is γ 2; as shown in fig. 3c, an angle between the extending direction of the reflection surface and the vertical direction of the sheet-like swinging member 11 in the third swinging state is γ 3; as shown in fig. 3d, when the angle between the extending direction of the reflection surface and the vertical direction of the sheet-like swinging member 11 in the fourth swinging state is γ 4, | γ 2- γ 1| ═ γ 4- γ 3|, and | γ 3- γ 2| - γ 4- γ 1 |. It should be noted that the included angle between the extending direction of the reflecting surface and the vertical direction is the same as the included angle between the normal direction of the reflecting mirror 110 and the horizontal direction, and for convenience of illustration, the included angle between the normal direction of the reflecting mirror 110 and the horizontal direction is shown in fig. 3a to 3 d. Further, it is defined that if the mirror 110 rotates clockwise from the normal direction to the horizontal direction, the angle value of the included angle between the normal direction of the mirror 110 and the horizontal direction is positive, and as shown in fig. 3c and 3d, the angle values γ 3 and γ 4 are both positive. If the mirror 110 rotates counterclockwise from the normal direction to the horizontal direction, the angle between the normal direction of the mirror 110 and the horizontal direction is negative, and as shown in fig. 3a and 3b, the angle γ 1 and γ 2 are both negative.
In an embodiment of the present invention, a plane formed by the central line of the first position-limiting groove 32 and the central line of the second position-limiting groove 33 is parallel to the reflection surface 110 of the swing mirror, so that the whole structure of the swing mirror is relatively symmetrical, and the complexity of the radar structure can be reduced.
With continued reference to fig. 3, it can be seen that the oscillating mirror in the embodiment of the present invention further includes: an elastic member 35, one end of the elastic member 35 is fixedly connected to the inside of the housing 30, the other end of the elastic member 35 abuts against the rear surface of the sheet-shaped swinging member 11 through a suspension beam in a welding manner, the elastic member 35 can be a spring, and the elastic member 35 is used for pushing the sheet-shaped swinging member 11 from the rear to the front inside the housing 30 so as to ensure that the sheet-shaped swinging member 11 can swing flexibly inside the housing 30. In another embodiment of the present invention, the elastic member 35 may be used to suspend the sheet-like swing member 11 such that the sheet-like swing member 11 translates back and forth or rotates in a pitch direction.
In order to make the technical personnel in the field understand and realize the invention better, the embodiment of the invention also provides a driving method of the oscillating mirror, namely, the sheet-shaped oscillating component is driven to oscillate in the shell by applying a driving signal to the driving component.
Still referring to fig. 3, the control element for controlling the swing mirror can control to apply a first driving signal to the first driving device 143 to push or pull the top end of the sheet-like swing member 11; and controlling to apply a second driving signal to the second driving device 144 to push and pull the bottom end of the sheet-like swinging member 11, so as to drive the sheet-like swinging member 11 to switch among the first swinging state, the second swinging state, the third swinging state and the fourth swinging state.
In a specific implementation, the first driving signal and the second driving signal can be applied in a time-sharing manner to drive the sheet-like swinging component 11 to be circularly switched in the order of the first swinging state, the second swinging state, the third swinging state, the fourth swinging state and then returning to the first swinging state, so that the complexity of the radar can be reduced.
In order to ensure that the end (top end and/or bottom end) of the sheet-like swinging member 11 is pressed from one side of the flange of the limiting groove (the first limiting groove 32 and/or the second limiting groove 33) to the other side of the flange of the limiting groove as lightly as possible to avoid direct collision, and if the first driving signal used when pushing the sheet-like swinging member 11 is a positive signal and the first driving signal used when pulling the sheet-like swinging member 11 is a negative signal, in a specific implementation, the first driving signal may be adjusted, for example, the first driving signal in the positive direction is used first, and then the first driving signal in the negative direction is used to drive the top end of the sheet-like swinging member 11 to move in an accelerating and decelerating manner first, and finally move relatively stably to the front or rear flange of the first limiting groove 32. Similarly, the second driving signal can be adjusted, for example, a positive second driving signal is used first, and then a negative second driving signal is used to drive the bottom end of the sheet-like swinging component 11 to accelerate and then decelerate first, and finally move relatively stably to the front or rear flange of the second limit groove 33. In other words, when the coils 143 and 144 are used to drive the swing mirror to switch the swing state, the tilt angle is controlled by the limiting groove, so that the feedback control can be avoided as much as possible, and the magnetic steels 141 and 142 can be pushed and pulled by adjusting the current direction and amplitude of the coils 143 and 144 and the driving duration, so as to switch the swing mirror to the next swing state within the switching duration Δ t.
If the first driving signal is OUT1 and the second driving signal is OUT2, there are three timing sequences for each switching of the wobble state. If a certain end is originally located at 0 (corresponding to the left) and is now to be switched to 1 (corresponding to the right), the swing state is locked until the next switching of the swing state, wherein the swing state is accelerated (OUT1 is 1) for a time length TA1, then decelerated (OUT1 is 0) for a time length TD 1. The state of the drive signal OUT2 for the coil at the other end of the oscillating mirror is unchanged throughout the switching process. And at the next switching time of the swing state, the OUT1 is not changed, and the OUT2 repeats the process.
In the specific implementation, TA1> TD1, TA1+ TD1< Δ t may be provided, so that the sheet-like swinging member 11 can be lightly buckled on the other side without being knocked up, and the loss can be reduced. When the state of the swing mirror is switched every time, the required acceleration duration and the required deceleration duration can be independently controlled, so that the control flexibility is improved.
For ease of understanding, fig. 4A is a schematic side view showing a structure of a transmitting apparatus of a lidar in an embodiment of the present invention, fig. 4B is a plan view showing the structure of the transmitting apparatus of the lidar in the embodiment of the present invention, and referring to fig. 4A and 4B, the transmitting apparatus includes: at least one light emitter 41, a swing mirror 42, an emitting lens assembly 43, and a turning mirror 44. The plurality of light emitters 41 are configured to emit probe beams, the plurality of light emitters 41 are arranged along a vertical direction of the lidar, and the probe beams emitted by the plurality of light emitters 41 have different vertical field angles. The rotating mirror 44 is disposed at the focal plane of the emitting lens assembly 43, and the image of the detecting beam collimated by the emitting lens assembly 43 on the rotating mirror 44 is also the image formed on the focal plane. The rotating shafts of the swing mirror 42 and the rotating mirror 44 are perpendicular to each other.
In a specific implementation, the oscillating mirror 42 can be implemented by any one of the above embodiments, and can also be implemented by other ways, including but not limited to, for example, using a one-dimensional galvanometer, a rotating prism, a liquid crystal, one or more optical phased arrays operated by using an electronic signal, or a motor-driven mechanical element, as long as the oscillating mirror 42 can deflect any one of the incident probe beams to different positions on the emission lens assembly 43, and then after being collimated by the emission lens assembly 43, the resultant image has different translations or dispersions in the vertical direction on the focal plane of the emission lens assembly 43, generally on the rotating mirror 44.
In an embodiment of the present invention, the swing mirror 42 is implemented by any one of the above-described embodiments, that is, a structure capable of performing pitching swing in the vertical direction, having N (for example, 4) swing states, and sequentially switching between the N swing states or selecting a part (for example, 3) of the N swing states. In this case, the swing mirrors 42 in different swing states may have different tilt angles, and further, for any one probe beam, the swing mirror 42 in different swing states may deflect the one probe beam to different positions of the emission lens assembly 43, so that after the probe beam is collimated by the emission lens assembly 43, an image formed on the emission lens assembly 43 or the turning mirror 44 may have relative translation in position, and thus, any one probe beam may be divided into a plurality of probe sub-beams with different vertical view field directions. Since the above embodiments have been described in detail for the purpose of illustrating the principles and structures thereof, further description is omitted.
An emission lens assembly 43 may be used to collimate the probe beam deflected by the oscillating mirror 42.
And a rotating mirror 44 fixed on the rotor and rotating around a rotating shaft of the rotor arranged along the vertical direction, for reflecting the probe beam to the space to be measured, so as to realize the scanning of the probe beam in the horizontal direction. Specifically, the rotating mirror 44 has M reflecting surfaces, and the M reflecting surfaces cooperate with the swinging mirror 42 to synchronously cooperate, where M is a positive integer greater than or equal to 2. For convenience of explanation, in fig. 4A, the turning mirror 44 has 2 reflecting surfaces, i.e., a reflecting surface M11 and a reflecting surface M12, which are disposed in parallel and face each other. Fig. 4C is a schematic side view showing another structure of the transmitting device of the laser radar in the embodiment of the present invention, where M is 2, it can be understood that fig. 4A is a schematic view of the transmitting device at time t1, fig. 4C is a schematic view of the transmitting device at time (t1+ Δ t), a zero degree direction with the M direction as a reference, or an initial 0 ° direction in which the rotating mirror 44 starts to rotate, is selected, and it can be seen from comparing fig. 4A and 4C that the rotating mirror 44 always rotates around the rotation axis, and at time t1, the angle between the normal of the mirror surface of one of the transmitting surfaces M11 of the rotating mirror 44 and the M direction is equal toAt the time (t1+ Δ t), the normal of one of the emitting surfaces M11 of the rotating mirror 44 forms an angle with the M direction
In addition, FIG. 4D shows the present inventionIn fig. 4D and 4E, M is 4, 4 reflecting surfaces of the turning mirror 44 are respectively M11, M12, M13 and M14, fig. 4D is a schematic diagram of the transmitting device at time t3, fig. 4E is a schematic diagram of the transmitting device at time (t3+ Δ t), and a zero-degree direction in which the M direction is used as a reference or an initial 0 ° direction in which the turning mirror 44 starts to rotate is also selected, as can be seen from comparing fig. 4D and 4E, the turning mirror 44 rotates around the rotation axis all the time, and at time t3, an included angle between a normal line of one of the transmitting surfaces M11 of the turning mirror 44 and the M direction is an angleAt time (t3+ Δ t), the normal to the mirror surface of the emission surface M11 forms an angle with the M-direction
Therefore, in practical applications, a person skilled in the art can set the size of M and the relative position of the reflecting surface as required, and the examples herein do not limit the present application.
It should be noted that, as can be seen in fig. 4A, 4B, 4C, 4D and 4E, the clockwise rotation of the turning mirror 44 is merely a schematic illustration for facilitating understanding of those skilled in the art, but the schematic illustration is not a limitation to the present application. In another embodiment of the present invention, the turning mirror 44 may also be rotated counterclockwise.
In a specific implementation, the oscillating mirror 42 can swing around the rotating shaft to swing to different positions, and can present N swing states, and the oscillating mirror 42 in different swing states respectively has different pitch inclination angles. Fig. 4F is a schematic side view showing the structure of another lidar transmitting device in an embodiment of the present invention, and as can be seen from comparing fig. 4A and 4F, the oscillating mirror 42 may be in different oscillating states, and in fig. 4A, the oscillating mirror 42 may be in a first oscillating state, and the pitch angle is γ 1; in 4F, the swing mirror 42 may be in the second swing state with a pitch tilt angle γ 2. The oscillating mirror 42 can be sequentially switched between the N oscillating states, where N is a positive integer equal to or greater than 2. It is understood that the size of N is related to the arrangement of the first and second positioning grooves. In addition, the swing mirror 42 may be switched cyclically in sequence according to the order of the first swing state, the second swing state, the third swing state, the fourth swing state, and returning to the first swing state, and the swing mirror 42 may also be switched by selecting only a part of states, for example, may be switched in sequence according to the order of the third swing state, the fourth swing state, and returning to the third swing state.
Because the swing mirror has a plurality of swing states (N), and the rotating mirror has a plurality of reflecting surfaces (M), for better matching, the swing mirror and the rotating mirror need to be synchronized and coordinated to a certain extent, and different matching time sequences can exist between the frame frequency of the whole laser radar and the motion frequencies of the swing mirror and the rotating mirror, so that a user can switch the wiring harness and the frame rate as required.
In some embodiments of the invention, the oscillating mirror may not be driven, but only the turning mirror, where the oscillating mirror is similar to a one-sided mirror. If the number of the light emitters sequentially arranged in the vertical direction is 16, the frame frequency is X1HZ, and the rotation frequency of the rotating mirror is 2X1HZ, then the radar can scan the surrounding environment to obtain 16 lines of point cloud data. Moreover, if 16 light emitters are arranged in the vertical direction, the frame frequency is X1HZ, and the rotation frequency of the rotating mirror is 4X1HZ, then the radar can obtain 16 lines of point cloud data by scanning the surrounding environment, but the 16 lines of point cloud data are denser than the point cloud obtained by the rotating mirror with the frequency of 2X1 HZ. It should be noted that one point cloud image represents one frame, and the scanning is completed by rotating a rotating device such as a motor corresponding to the inside of the laser radar. The frame rate is the number of revolutions of the laser radar rotating device, such as the rotating mirror 44 or the motor, in one second, i.e. the number of times the laser radar completes one scan per second, and the frame rate also represents the frequency of updating the point cloud data acquired by the laser radar. For example, when a certain laser radar operates at a frame rate of 10HZ, it means that the rotation device of the laser radar rotates 10 revolutions per second.
In other embodiments of the present invention, the oscillating mirror may be switched from one oscillating state to the next oscillating state within an interval time which is not longer than an interval time between two consecutive horizontal scans performed by two adjacent reflecting surfaces of the rotating mirror, in other words, the oscillating mirror is in any one of the oscillating states for a certain period of time, and one reflecting surface of the rotating mirror performs one horizontal scan or one horizontal scan within the period of time.
For example, when M is 2 and N is 2, the two reflecting surfaces M11 and M12 of the rotating mirror are arranged in parallel to each other, and the swinging mirror has a first swinging state and a second swinging state. The synchronization and coordination of the oscillating mirror with the turning mirror can be referred to table 1, in particular:
at time t0, the oscillating mirror enters the first oscillating state, and during the period from time t1 (time t1 may be time t0, or later than time t 0) to time t2, the oscillating mirror remains in the first oscillating state, and at time t0 to time t1, the reflecting surface of the oscillating mirror does not start to operate, or the emitter does not emit the probe beam, the oscillating mirror does not scan in the horizontal direction during the period from time t0 to time t1, the angle between the extending direction of the reflecting surface of the oscillating mirror in the first oscillating state and the vertical direction is γ 1 (refer to fig. 3a and 4A), the incident beam is deflected by the reflecting surface of the oscillating mirror from time t1 to the M11 surface of the oscillating mirror, and the M11 surface of the oscillating mirror rotates around the rotating shaft in the horizontal direction during the period from time t1 to time t2(refer to FIG. 4A) rotate to(refer to fig. 4C), one scan in the horizontal direction is completed. Then, during a period from time t3 (time t3 may be time t2, or a time later than time t 2) to time t4, the swing mirror is switched from the first swing state to the second swing state, the rotating mirror continues to rotate, but the rotating mirror does not deflect the incident beam due to the reflection surface of the rotating mirror and/or the emitter does not emit the probe beam during the period, even the reflection surface of the rotating mirror does not start to work, and the time t3 to the time t4 is totally returned toWithout scanning in the horizontal direction, the angle between the extending direction of the reflecting surface of the oscillating mirror in the second oscillating state and the vertical direction is γ 2 (refer to fig. 3b and 4F), at time t5 (time t5 may be time t4 or time later than t 4), the M12 surface of the rotating mirror rotates to receive the incident beam deflected by the oscillating mirror in the second oscillating state and starts to operate, and the oscillating mirror keeps the second oscillating state in the following time period from time t5 to time t6, and the M12 surface of the rotating mirror rotates around the rotating shaft from the rotating shaft to the vertical direction(not shown, since M11 is parallel to M12, it is similar toCan also be understood with reference to fig. 4A) to rotate to(not shown, similar toAs can also be understood with reference to fig. 4C), one scan in the horizontal direction is completed. Then, the above process is repeated and circulated, which is not described in detail.
TABLE 1
For example, when M is 2 and N is 4, the two reflecting surfaces M11 and M12 of the turning mirror are arranged in parallel to each other, and the turning mirror has a first turning state, a second turning state, a third turning state, and a fourth turning state. Frame frequency of the whole radar is X2HZ, 2X rotating mirror2HZ, the operating frequency of the oscillating mirror is 4X2And HZ, if the number of the light emitters sequentially arranged in the vertical direction is 16, the radar can scan the surrounding environment to obtain 64 lines of point cloud data. The synchronization and coordination of the oscillating mirror with the turning mirror can be referred to table 2, in particular:
at time t0, the oscillating mirror enters the first oscillation state,in a period from time t1 (time t1 may be time t0, or later than time t 0) to time t2, the oscillating mirror is kept in the first oscillating state, and from time t0 to time t1, the reflecting surface of the rotating mirror does not start to operate, or the emitter does not emit a probe beam, the rotating mirror does not perform scanning in the horizontal direction in a period from time t0 to time t1, an included angle between the reflecting surface of the oscillating mirror in the first oscillating state and the vertical direction is γ 1 (refer to fig. 3a and 4A), from time t1, the incident beam is deflected by the reflecting surface of the oscillating mirror and then enters the M11 surface of the rotating mirror, and the M11 surface of the rotating mirror rotates around the rotating shaft in the horizontal direction in a period from time t1 to time t2(refer to FIG. 4A) rotate to(refer to fig. 4C), one scan in the horizontal direction is completed.
Then, during the period from time t3 (time t3 may be time t2, or a time later than time t 2) to time t4, the oscillating mirror switches from the first oscillating state to the second oscillating state, the rotating mirror continues to rotate, but during the period, the rotating mirror does not deflect the incident beam and/or the emitter does not emit the probe beam, even the reflecting surface of the rotating mirror does not start to work, the rotating mirror does not scan in the horizontal direction during the period from time t3 to time t4, the angle between the reflecting surface of the oscillating mirror in the second oscillating state and the vertical direction is γ 2 (refer to fig. 3b and 4F), at time t5 (time t5 may be time t4, or a time later than time t 4), the M12 surface of the rotating mirror rotates to receive the incident beam deflected by the oscillating mirror in the second oscillating state and starts to work, and continues to the period 6 after time t5 to time t 3556, the swing mirror is also kept in the second swing state at all times, and the M12 surface of the rotating mirror rotates around the rotating shaft(not shown, since M11 is parallel to M12, it is similar toCan also be understood with reference to fig. 4A) to rotate to(not shown, similar toAs can also be understood with reference to fig. 4C), one scan in the horizontal direction is completed.
Then, during the period from time t7 (time t7 may be time t6, or a time later than time t 6) to time t8, the oscillating mirror is switched from the second oscillating state to the third oscillating state, the rotating mirror continues to rotate, but during the period, the rotating mirror does not deflect the incident beam and/or the emitter does not emit the probe beam, even the reflecting surface of the rotating mirror does not start to work, the rotating mirror does not scan in the horizontal direction during the period from time t7 to time t8, the angle between the reflecting surface of the oscillating mirror in the third oscillating state and the vertical direction is γ 3 (refer to fig. 3c), at time t9 (time t9 may be time t8, or a time later than time t 8), the M11 surface of the rotating mirror rotates to receive the incident beam deflected by the oscillating mirror in the third oscillating state and starts to work, and continues during the following period from time t9 to time t10, the swing mirror is also kept in the third swing state all the time, and the M11 surface of the rotating mirror rotates around the rotating shaft(not shown, similar toAs can be understood with reference to fig. 4A) is rotated to(not shown, similar toAs can also be understood with reference to fig. 4C), one scan in the horizontal direction is completed.
Then, at tDuring the period from time 11 (time t11 may be time t10, or time later than time t 10) to time t12, the oscillating mirror switches from the third oscillating state to the fourth oscillating state, the rotating mirror continues to rotate, but during this period, the rotating mirror does not deflect the incident beam and/or the emitter does not emit the detection beam, even the reflecting surface of the rotating mirror does not work, the rotating mirror does not scan in the horizontal direction during the period from time t11 to time t12, the angle between the reflecting surface of the oscillating mirror in the fourth oscillating state and the vertical direction is γ 4 (refer to fig. 3d), at time t13 (time t13 may be time t12, or time later than time t 12), the M12 surface of the rotating mirror rotates to receive the incident beam deflected by the oscillating mirror in the fourth oscillating state and starts to work, and continues during the following period from time t13 to time t14, the swing mirror is also kept in the fourth swing state at all times, and the M12 surface of the rotating mirror rotates around the rotating shaft(not shown, similar toCan also be understood with reference to fig. 4A) to rotate to(not shown, similar toAs can also be understood with reference to fig. 4C), one scan in the horizontal direction is completed. And then the above process is repeated and circulated continuously, which is not described in detail.
TABLE 2
For example, when M is 4 and N is 4, the turning mirror is a cube, the four reflection surfaces M11, M12, M13, and M14 are spaced apart from each other, and the swing mirror has a first swing state, a second swing state, a third swing state, and a fourth swing state. Frame frequency of the whole radar is X3HZ, rotating mirror isX3HZ, the operating frequency of the oscillating mirror is 4X3HZ, synchronization and coordination of the oscillating mirror with the turning mirror can be found in table 3, in particular:
at time t0, the swing mirror enters a first swing state, the swing mirror is kept in the first swing state from time t1 (time t1 may be time t0, or later than time t 0) to time t2, an included angle between a reflection surface of the swing mirror in the first swing state and the vertical direction is γ 1 (refer to fig. 3a and 4A), the reflection surface of the swing mirror deflects the incident light beam from time t1 and then enters the M11 surface of the swing mirror, and the M11 surface of the swing mirror horizontally rotates around the rotation shaft from time t1 to time t2(not shown, as can be appreciated with reference to FIG. 4D) to(not shown, as can be appreciated with reference to fig. 4E), one scan in the horizontal direction is completed.
Then, during the period from time t3 (time t3 may be time t2, or a time later than time t 2) to time t4, the oscillating mirror switches from the first oscillating state to the second oscillating state, the rotating mirror continues to rotate, but during this period, the rotating mirror does not deflect the incident beam and/or the emitter does not emit the probe beam, or the reflecting surface of the rotating mirror does not start to operate, but the angle between the reflecting surface of the oscillating mirror in the second oscillating state and the vertical direction is γ 2 (refer to fig. 3b and fig. 4F), at time t5 (time t5 may be time t4, or a time later than time t 4), the M12 surface of the rotating mirror rotates to receive the incident beam deflected by the oscillating mirror in the second oscillating state and starts to operate, and the oscillating mirror continues to maintain the second oscillating state during the period from time t5 to time t6, and the M12 surface of the rotating mirror rotates around the rotating shaft(refer to FIG. 4D) rotate to(refer to fig. 4E), one scan in the horizontal direction is completed.
Then, during the period from time t7 (time t7 may be time t6, or a time later than time t 6) to time t8, the oscillating mirror is switched from the second oscillating state to the third oscillating state, the rotating mirror continues to rotate, but during the period, the rotating mirror does not deflect the incident beam and/or the emitter does not emit the probe beam, or the reflecting surface of the rotating mirror does not start to operate, the rotating mirror does not scan in the horizontal direction during the period from time t7 to time t8, the angle between the reflecting surface of the oscillating mirror in the third oscillating state and the vertical direction is γ 3 (refer to fig. 3c), at time t9 (time t9 may be time t8, or a time later than time t 8), the M13 surface of the rotating mirror rotates to receive the incident beam deflected by the oscillating mirror in the third oscillating state and starts to operate, and continues during the period from time t9 to time t10, the swing mirror is also kept in the third swing state all the time, and the M13 surface of the rotating mirror rotates around the rotating shaft(not shown, as can be appreciated with reference to FIG. 4D) to(not shown, as can be appreciated with reference to fig. 4E), one scan in the horizontal direction is completed.
Then, during a period from time t11 (time t11 may be time t10, or a time later than time t 10) to time t12, the oscillating mirror is switched from the third oscillating state to the fourth oscillating state, the rotating mirror continues to rotate, but during the period, the rotating mirror does not deflect the incident beam and/or the emitter does not emit the probe beam, or the reflecting surface of the rotating mirror does not start to work, the rotating mirror does not scan in the horizontal direction during the period from time t11 to time t12, an included angle between the reflecting surface of the oscillating mirror in the fourth oscillating state and the vertical direction is γ 4 (refer to fig. 3d), and at time t13 (time t13 may be time t12, or a time later than time t 12), the M14 surface of the rotating mirror rotates to receive the incident beam in the fourth oscillating stateThe swing mirror deflects the incident light beam and starts to work, and continues to keep the fourth swing state in the following time period from the time t13 to the time t14, and the M14 surface of the swing mirror rotates around the rotating shaft from the time t14(not shown, as can be appreciated with reference to FIG. 4D) to(not shown, as can be appreciated with reference to fig. 4E), one scan in the horizontal direction is completed. And then the above process is repeated and circulated continuously, which is not described in detail.
TABLE 3
In a specific implementation, the vertical field angle of the probe beam emitted by the light emitter is uniformly distributed within the field range of scanning in the vertical direction of the laser radar, so that uniform scanning can be achieved over the vertical field of view.
In a specific implementation, if the difference between the vertical field angles of the probe beams emitted by two adjacent light emitters is set to be α degrees, and the difference between the vertical field angles of any one probe beam deflected by the two adjacent oscillating mirrors in the oscillating state is set to be β degrees, then the following proportional relationship exists between the difference angle α and the difference angle β:
wherein α ═ β × N;
n is the number of the swing states of the swing mirror, so that it can be seen that, through the deflection of the swing mirror in N different swing states, any collimated detection beam can be divided into N detection sub-beams equally divided in the vertical view field direction, and the N detection sub-beams different in the vertical view field direction are not generated at the same time point, but are generated one after another when the swing mirror is in one of the N swing states. In addition, the vertical view angle between the N detection sub-beams with different vertical view directions can be ensured to be the same by controlling the relative size relationship of the positioning grooves and the switching time sequence between the swinging states. Therefore, by adopting the transmitting end of the radar of the embodiment of the invention, the vertical scanning beam can be improved on the premise of not changing the number of the laser transmitters, so that the cost and the complexity of the radar can be reduced.
In order to further increase the beam of the vertical field of view of the lidar, in an embodiment of the present invention, at least two of the M reflecting surfaces of the turning mirror may be respectively provided with different tilt angles with respect to the vertical direction. In detail, a pitching inclination angle is additionally arranged on the M-plane rotating mirror, and the pitching inclination angle is an included angle with a rotating shaft (namely, a vertical direction) of the rotating mirror. Because the M-surface reflecting surface of the rotating mirror can generate a mirror effect on the incident detection light beam, when the M-surface reflecting surfaces are all parallel to the vertical direction, namely the pitching inclination angles of the M-surface reflecting surfaces are all zero, the incident detection light beam can be reflected out from the direction symmetrical to the horizontal plane after being reflected by the reflecting surface of the rotating mirror. For any reflecting surface in the M-plane, when there is a slight non-zero pitch tilt angle, the reflected probe beam will also deflect differently. If the pitching inclination angles of all the emitting surfaces are different, detection beams with different vertical view field directions are generated, and when the rotating mirror rotates around the rotating shaft in a matching manner, scanning tracks of the wire harnesses with different vertical view field directions are generated. Of course, when the M-plane turning mirror rotates around the rotation axis, the tilt effect of the turning mirror gradually disappears from the direction facing the incident probe beam to the direction gradually away from and nearly parallel to the incident beam. Therefore, the scan lines are uniformly distributed on the left side of the simulation result, and every adjacent M scan lines converge to the right side.
Fig. 5 shows a schematic structural diagram of a lidar in an embodiment of the present invention, where for differentiation, solid arrows in fig. 5 indicate the direction of an outgoing probe beam, and dashed arrows indicate the direction of an echo beam, as shown in fig. 5, the lidar may include: any one of the above embodiments of the transmitting device, the at least one optical receiver, and the control device. In addition, the laser radar may further include corresponding optical devices in order to achieve functions such as deflection or collimation of the light beam. For example, the laser radar may further include a beam splitting device and a receiving lens assembly, wherein the beam splitting device is configured to reflect or transmit the probe beam and to transmit or reflect the echo beam; the receiving lens assembly is used for collecting the echo light beam.
Referring to fig. 5, the operation of the lidar is as follows:
the detection light beam emitted by the light emitter is reflected or transmitted by the light splitting device and then enters the swing mirror, the detection light beam is deflected by one swing mirror in N swing states and then enters the emission lens assembly to be collimated, the collimated detection light beam enters the rotating mirror synchronous with the emission light beam and is reflected to a space to be measured by a reflecting surface of the rotating mirror, the detection light beam forms an echo light beam after being reflected by a target of the space to be measured, the echo light beam is reflected to the receiving lens assembly by the rotating mirror, the echo light beam is collected by the receiving lens assembly and enters the swing mirror, the echo light beam is deflected by the swing mirror and then enters the light splitting device again, and the echo light beam is transmitted or reflected by the light splitting device and then is converged on the light receiver. In terms of control, the control device with at least one processor can control the synchronization between the swing mirror and the rotating mirror, and correspondingly calculate the distance between the target in the space to be measured and the laser radar according to the time interval between the emission time of the detection beam and the receiving time of the echo beam.
Fig. 6 shows a schematic structural diagram of another lidar in an embodiment of the present invention, and for differentiation, solid arrows in fig. 6 indicate the direction of the outgoing probe beam, and dashed arrows indicate the direction of the return beam. Unlike fig. 5, the lidar in this embodiment may additionally include, in addition to the components shown in fig. 5: the second swing mirror is arranged right above or below the swing mirror, and can be driven synchronously with the swing mirror as long as the second swing mirror is overlapped with the projection of the swing mirror on the horizontal plane, so that the second swing mirror and the swing mirror are in the same swing state. Similarly to fig. 5, in order to implement the functions of deflecting or collimating the light beam, the lidar further includes a beam splitter and a receiving lens assembly, where the beam splitter is configured to reflect or transmit the probe light beam and transmit or reflect the echo light beam; the receiving lens assembly is used for collecting the echo light beam.
Referring to fig. 6, the operation of the lidar is as follows:
the detection light beam emitted by the light emitter is reflected or transmitted by the light splitting device and then enters the swing mirror, the detection light beam is deflected by the swing mirror and then enters the emission lens assembly to be collimated, the collimated detection light beam enters the swing mirror synchronously matched with the swing mirror and then is reflected to the space to be measured, the detection light beam is reflected by a target of the space to be measured to form the echo light beam, the echo light beam is reflected to the receiving lens assembly by the swing mirror, the echo light beam is collected by the receiving lens assembly and enters the second swing mirror, the echo light beam is deflected by the second swing mirror and then enters the light splitting device, and the echo light beam is transmitted or reflected by the light splitting device and then is converged on the light receiver. In background control, the control device also controls the synchronization among the swing mirror, the second swing mirror and the rotating mirror, and correspondingly calculates the distance between the target in the space to be measured and the laser radar according to the time interval between the emission time of the detection beam and the receiving time of the echo beam.
It should be noted that, regarding the control of the synchronization of the swing mirror and the turning mirror, the details have been described in the above embodiments, and are not repeated herein.
To better illustrate the scanning effect of the lidar in the embodiment of the present invention, fig. 7 shows a schematic scanning track diagram of the lidar in the embodiment of the present invention, where the light emitter is 4 LDs, the 4 LDs are uniformly and sequentially arranged in the vertical direction, and the oscillating mirror has N-2 oscillating states: the first and second swing states correspond to 2 kinds of inclination angles of the reflection surface or the reflection mirror with respect to the vertical direction: γ 1 (refer to fig. 3a) and γ 2 (refer to fig. 3b), the rotating mirror has 2 reflecting surfaces, and the 2 reflecting surfaces are all parallel to the vertical direction, the horizontal axis of fig. 7 is the horizontal direction scanning view field, and the vertical axis is the vertical direction scanning view field. As shown in fig. 7, 8 scanning lines that are relatively uniform in the vertical field of view can be seen, because one probe beam emitted by each LD can be deflected by the oscillating mirror in the first oscillating state or the second oscillating state, respectively, to equally form two probe beams different in the vertical scanning direction, the oscillating mirror expands the beam, and the scanning in the horizontal direction is achieved by the rotation of the oscillating mirror around the rotating shaft, so that 8 scanning lines can be obtained. It will be appreciated that the scan lines described above are formed by scanning of the probe beam. In fig. 7, scanning lines corresponding to γ 1 and γ 2 are indicated.
Fig. 8 shows a schematic scanning track of a lidar in an embodiment of the present invention, where the optical transmitter is 4 LDs, the 4 LDs are uniformly and sequentially arranged in a vertical direction, and the oscillating mirror has N-4 oscillating states: the first swing state, the second swing state, the third swing state, and the fourth swing state correspond to the reflection surface or the mirror having 4 kinds of inclination angles with respect to the vertical direction of the laser radar: γ 1 (refer to fig. 3a), γ 2 (refer to fig. 3b), γ 3 (refer to fig. 3c), and γ 4 (refer to fig. 3d), the rotating mirror has 2 reflecting surfaces, and the 2 reflecting surfaces can be all parallel to the vertical direction, the horizontal axis of fig. 8 represents the horizontal direction scanning angle of the laser radar, and the vertical axis represents the vertical direction scanning angle of the laser radar. As shown in fig. 8, 16 scanning lines that are relatively uniform in the vertical field of view can be seen, because one of the detection beams emitted by each LD can be deflected by the oscillating mirror in the first oscillating state, the second oscillating state, the third oscillating state, or the fourth oscillating state, respectively, so as to equally form four detection beams with different vertical scanning directions in the vertical field of view, the oscillating mirror expands the beam, and the scanning in the horizontal direction is achieved by the rotation of the rotating mirror around the rotating shaft, so that 16 scanning lines can be obtained. In fig. 8, scanning lines corresponding to γ 1, γ 2, γ 3, and γ 4 are indicated.
Fig. 9 shows a schematic scanning track of a laser radar in an embodiment of the present invention, where the light emitters are 4 LDs, namely LD1, L,2, LD3, and LD4, the 4 LDs are uniformly and sequentially arranged along a vertical direction, and the oscillating mirror has N ═ 4 oscillating states: the first swing state, the second swing state, the third swing state, and the fourth swing state correspond to the reflection surface or the mirror having 4 kinds of inclination angles with respect to the vertical direction: γ 1 (refer to fig. 3a), γ 2 (refer to fig. 3b), γ 3 (refer to fig. 3c) and γ 4 (refer to fig. 3d), and the 2 reflection surfaces (M11 and M12, respectively) of the turning mirror have non-zero included angles with the vertical direction, and the included angles may be δ 1 and δ 2. In fig. 9, the horizontal axis represents the horizontal scanning angle, and the vertical axis represents the vertical scanning angle. As shown in fig. 9, 32 scanning lines in the vertical field of view can be seen, partly because, similar to the corresponding embodiment in fig. 8, one of the detection beams emitted by each LD can be deflected by the swing mirror in the first swing state, the second swing state, the third swing state or the fourth swing state, respectively, to equally form four detection beams in different vertical scanning directions in the vertical field of view, and the swing mirror expands the beam, and partly because the reflection surface of the tilted mirror also expands the beam in the vertical direction, and the rotation of the mirror around the rotation axis reaches the scanning in the horizontal direction, thereby forming 32 scanning lines in total. In addition, it can be seen that the scan lines are still more evenly distributed on the left side, but to the right side, every two adjacent scan lines are nearly converged together. The reason why this left and right side unevenness occurs is that, as described above, the tilt effect of the polygon mirror gradually disappears from the direction facing the incident probe beam to the direction gradually away from and nearly parallel to the incident beam as the polygon mirror rotates about the rotary shaft. Therefore, the scan lines are uniformly distributed on the left side of the simulation result, and every adjacent scan lines converge together to the right side.
Moreover, since there are too many beams in fig. 9, for the convenience of illustration, in fig. 9, the scanning beams are numbered according to the rules of light emitter-tilting angle of the tilting mirror, for example, 1-1-1 indicates LD1- γ 1- δ 1, that is, the scanning beam is the first light emitter LD1, and when the tilting mirror is in the first swinging state (tilting angle γ 1), the reflecting surface M11 (included angle δ 1) rotates around the rotating shaft to scan the obtained beams; for another example, 2-1-1 indicates LD2- γ 1- δ 1, that is, the scanning beam is a second light emitter LD2, when the oscillating mirror is in the first oscillating state (the inclination angle is γ 1), the reflecting surface M11 (the included angle is δ 1) rotates around the rotating shaft, and then the obtained beam is scanned; for another example, 2-2-1 indicates LD2- γ 2- δ 1, that is, the scanning beam is a beam obtained by scanning a second light emitter LD2 when the oscillating mirror is in a second oscillating state (the inclination angle is γ 2) and the reflection surface M11 (the included angle is δ 1) rotates around the rotation axis; for another example, 2-2-2 indicates LD2- γ 2- δ 2, that is, the scanning beam is the second light emitter LD2, and when the oscillating mirror is in the second oscillating state (the inclination angle is γ 2), the reflection surface M12 (the included angle is δ 2) rotates around the rotation axis and then scans the obtained beam.
Comparing fig. 8 and 9, it can be seen that, by setting an inclination angle different from zero with respect to the vertical direction with respect to the reflection surface of the counter rotating mirror, the oscillating mirror in the embodiment of the present invention can obtain a plurality of scanning lines and relatively uniform scanning lines without increasing the number of light emitters.
It should be noted that the light emitter in the present application may be any suitable type of emitting element. For example, the light emitter may be an LED, an LD, or a VCSEL, and the like, and the light emitter may adjust parameters according to the detection requirement, such as adjusting the light emitting intensity, adjusting the light emitting frequency, and adjusting the light emitting wavelength. The optical receiver may be any suitable type of detection device capable of converting light into an electrical signal, such as an APD, SPAD, SiPM, or the like.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the invention as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (18)

1. A pendulum mirror for deflecting an incident light beam, comprising:
the inner sides of the top and the bottom of the shell are respectively provided with a first limiting groove and a second limiting groove, the extending directions of the first limiting groove and the second limiting groove are parallel to the reflecting surface of the swing mirror, and the stroke width of at least one of the first limiting groove and the second limiting groove in the front-back direction of the shell is not zero;
the top end and the bottom end of the sheet-shaped swinging component are respectively clamped in the first limiting groove and the second limiting groove, the front surface of the sheet-shaped swinging component is provided with a reflecting surface, and the reflecting surface is used for deflecting the incident light beam;
and the driving component is suitable for driving the sheet-shaped swinging component to swing in the shell.
2. The oscillating mirror according to claim 1, wherein the stroke widths of the first and second limiting grooves in the front-rear direction of the housing are not zero.
3. The oscillating mirror according to claim 2, wherein the driving member comprises:
the first magnetic component is arranged on the sheet-shaped swinging component and is close to the top end of the sheet-shaped swinging component;
the second magnetic component is arranged on the sheet-shaped swinging component and is close to the bottom end of the sheet-shaped swinging component;
the first driving device is fixedly arranged in the shell, is opposite to the first magnetic part and is arranged at intervals, and is arranged to be capable of pushing and pulling the first magnetic part under the driving of a first driving signal so as to drive the top end of the sheet-shaped swinging part to swing in the first limiting groove;
and the second driving device is fixedly arranged in the shell, is opposite to the second magnetic part and is arranged at intervals, and is arranged to be capable of pushing and pulling the second magnetic part under the driving of a second driving signal so as to drive the bottom end of the sheet-shaped swinging part to swing in the second limiting groove.
4. The oscillating mirror according to claim 3,
the stroke width of the first limiting groove is different from that of the second limiting groove.
5. The oscillating mirror according to claim 4,
the sheet-like swing member has four swing states including:
in a first swinging state, the first driving device pushes the top end of the sheet-shaped swinging component to be abutted with the front flange of the first limiting groove, and the second driving device pushes the bottom end of the sheet-shaped swinging component to be abutted with the front flange of the second limiting groove;
in a second swinging state, the first driving device pushes the top end of the sheet-shaped swinging component to be abutted with the front flange of the first limiting groove, and the second driving device pulls the bottom end of the sheet-shaped swinging component to be abutted with the rear flange of the second limiting groove;
in a third swinging state, the first driving device pulls the top end of the sheet-shaped swinging component to be abutted against the rear flange of the first limiting groove, and the second driving device pulls the bottom end of the sheet-shaped swinging component to be abutted against the rear flange of the second limiting groove;
in a fourth swinging state, the first driving device pulls the top end of the sheet-shaped swinging component to be abutted against the rear flange of the first limiting groove, and the second driving device pushes the bottom end of the sheet-shaped swinging component to be abutted against the front flange of the second limiting groove.
6. The oscillating mirror according to claim 5,
the sheet-like swing member is sequentially driven cyclically in the order of the first swing state, the second swing state, the third swing state, the fourth swing state, and returning to the first swing state.
7. The oscillating mirror according to claim 4,
the stroke width of the first limiting groove is n times of the stroke width of the second limiting groove, or the stroke width of the second limiting groove is n times of the stroke width of the first limiting groove, and n is a natural number greater than 1.
8. The oscillating mirror according to any one of claims 1 to 7,
and a surface formed by the central line of the first limit groove and the central line of the second limit groove is parallel to the reflecting surface of the swing mirror.
9. The oscillating mirror according to claim 2, further comprising:
one end of the elastic component is fixedly connected inside the shell, the other end of the elastic component abuts against the rear surface of the sheet-shaped swinging component, and the elastic component is used for suspending the sheet-shaped swinging component so that the sheet-shaped swinging component can translate back and forth or rotate in the pitching direction.
10. The oscillating mirror according to claim 2,
and buffer bushes are arranged in the first limiting groove and the second limiting groove respectively.
11. The oscillating mirror according to claim 3,
the first driving device is a first electromagnetic coil configured to be driven by an electric current to push or pull the first magnetic member;
the second driving device is a second electromagnetic coil that is provided so as to be able to push and pull the second magnetic member by current driving.
12. The oscillating mirror according to claim 1,
and a reflector is attached to the front surface of the sheet-shaped swinging component and used for deflecting the incident light beam.
13. A lidar transmitting apparatus, comprising:
the optical transmitter comprises at least one optical transmitter, a light source and a light source, wherein the optical transmitter is used for transmitting a detection light beam, the optical transmitters are arranged along the vertical direction, and the detection light beam transmitted by each optical transmitter has different vertical field angles;
the oscillating mirror according to any one of claims 1 to 12 for deflecting the incident probe beam, the oscillating mirror being capable of tilting in a vertical direction so as to vary a vertical field angle of the probe beam to effect scanning of the probe beam in the vertical direction;
the emission lens assembly is used for collimating the detection light beam deflected by the swing mirror;
the rotating mirror is fixed on the rotor and rotates around a rotating shaft of the rotor, wherein the rotating shaft is arranged along the vertical direction, the rotating mirror is provided with M reflecting surfaces and is synchronous with the swinging mirror, the rotating mirror is used for reflecting the detection light beams to a space to be detected, and therefore the scanning of the detection light beams in the horizontal direction is achieved, and M is a positive integer greater than or equal to 2.
14. A lidar, comprising:
the transmitting apparatus of claim 13;
the optical receiver is used for receiving an echo light beam, and the echo light beam is formed after the emitted light beam is reflected by a target in the space to be measured;
and the control device is provided with at least one processor and is used for controlling the synchronization between the swing mirror and the rotating mirror and calculating the distance between the target in the space to be measured and the laser radar according to the time interval between the emission time of the detection light beam and the receiving time of the echo light beam.
15. A method of driving a swing mirror according to any one of claims 1 to 12, wherein a driving signal is applied to said driving member to drive said sheet-like swinging member to swing within said housing.
16. The driving method of a swing mirror according to claim 15, comprising:
applying a first drive signal to the first drive device;
and applying a second driving signal to a second driving device to drive the sheet-shaped swinging component to switch among a first swinging state, a second swinging state, a third swinging state and a fourth swinging state.
17. The driving method of a swing mirror according to claim 16, comprising:
adjusting the first driving signal to drive the top end of the sheet-shaped swinging component to move to the front or rear flange of the first limit groove firstly in an accelerating way and then in a decelerating way; and/or the presence of a gas in the gas,
and adjusting the second driving signal to drive the top end of the sheet-shaped swinging component to move to the front or rear flange of the second limit groove firstly in an accelerating way and then in a decelerating way. The acceleration and deceleration operations in the above-described driving are not necessary.
18. The driving method of a swing mirror according to claim 16,
and applying the first driving signal and the second driving signal in a time-sharing manner to drive the sheet-shaped swinging component to be sequentially switched in a circulating manner according to the sequence of the first swinging state, the second swinging state, the third swinging state, the fourth swinging state and returning to the first swinging state, or to select a part of states to be switched.
CN201910758380.8A 2019-08-16 2019-08-16 Swing mirror, driving method thereof and laser radar Active CN110596674B (en)

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JPH11252886A (en) * 1998-03-06 1999-09-17 Japan Servo Co Ltd Dc brushless motor
CN1318766A (en) * 2001-06-15 2001-10-24 清华大学 Two-dimensional laser beam director
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