CN218387163U - Mirror motor shakes - Google Patents

Abstract

The application relates to a mirror motor shakes, including drive-by-wire unit, housing unit and lens unit, the drive-by-wire unit includes: the photovoltaic module comprises a PCB with a plurality of photovoltaic cells, a light shading plate and a light source, wherein the light shading plate is arranged between the light source and the plurality of photovoltaic cells; the light shielding plate includes: the shading plate comprises a shading part and a fixing part which is arranged along the center of the surface of one side of the shading part in an outward protruding mode, wherein a positioning hole used for fixing the shading plate is formed in the fixing part. The special structure setting of light screen through the light screen has shortened the fitting distance between light screen and the photocell monomer, has improved the free detection precision of photocell.

Description

Mirror motor shakes

Technical Field

The application relates to the technical field of galvanometer scanning, in particular to a galvanometer motor.

Background

Lidar is an indispensable detection and sensing component for unmanned driving. The laser radar can be used for object detection and avoidance, object identification and tracking, timely positioning, map construction and the like. The galvanometer motor is used as a core component of the laser radar and has an important position in the laser radar.

The galvanometer motor is provided with a detection device used for determining the angular position of a rotating element in the galvanometer motor. Wherein the angular position of the rotating element can be determined by means of a photocell, a light source and a shutter arranged between the photocell and the light source. However, if the assembly distance between the light shielding plate and the single photocell is improper, some stray light cannot be completely shielded in the working process of the galvanometer motor, so that the detection accuracy of the photocell is low. There is a need to solve the above problems to improve the detection accuracy of the photovoltaic cell.

SUMMERY OF THE UTILITY MODEL

The vibrating mirror motor is provided aiming at the technical problems in the prior art, the special structure of the light screen is arranged, the assembly distance between the light screen and the single photocell is shortened, and the detection precision of the single photocell is improved.

The application provides a mirror motor shakes, including drive-by-wire unit, housing unit and lens unit, the drive-by-wire unit includes: the photovoltaic module comprises a PCB with a plurality of photovoltaic cells, a light shading plate and a light source, wherein the light shading plate is arranged between the light source and the plurality of photovoltaic cells; the light shielding plate includes: the shading plate comprises a shading part and a fixing part which is arranged along the center of the surface of one side of the shading part in an outward protruding mode, wherein a positioning hole used for fixing the shading plate is formed in the fixing part.

In the aforementioned galvanometer motor, the shielding portion includes a first sector plate and a second sector plate symmetrically disposed on two sides of the fixing portion.

The galvanometer motor as described above, the housing unit including: the lens unit is connected with a first end of the rotating shaft of the shell unit, and a limiting transverse shaft radially penetrates through a second end close to the rotating shaft; the drive-by-wire unit includes flexible spacing pad and control panel bearing frame, flexible spacing pad inlays to be established on the control panel bearing frame, the control panel bearing frame inlays to be established casing one side, be equipped with spacing through-hole on the flexible spacing pad, be used for holding spacing cross axle is in order to cushion the clash of spacing cross axle.

According to the galvanometer motor, the flexible limiting pad is made of rubber.

In the vibrating mirror motor, the assembly distance between the light shading plate and the photocell is 0.1-0.4mm.

According to the galvanometer motor, the PCB is in clearance fit with the second end of the rotating shaft through the through hole; the light screen is in interference fit with the end of the second end.

According to the galvanometer motor, the drive-by-wire unit further comprises a rear cover fixed with the shell unit through the PCB; the light source is fixed on the rear cover through the light source circuit board, and the range of the projected light spot of the light source is larger than the setting range of the plurality of photocell monomers.

According to the galvanometer motor, the light source is electrically connected with the light source circuit board by using an SMT (surface mount technology) chip process.

According to the vibrating mirror motor, the back cover is provided with the light through hole formed by the enclosing plate, the light source is arranged in the light through hole, the enclosing plate is arranged in a cone frustum shape in an enclosing manner, and the light source and the lower platform surface of the cone frustum cover the plurality of photocell monomers in the cone frustum.

According to the vibrating mirror motor, the photocell monomer is a PIN silicon photodiode packaged by an SMD and used for receiving infrared light with a wavelength within a certain range.

According to the vibrating mirror motor, the light source is the high-speed infrared emitting diode, and the high-speed infrared emitting diode can uniformly generate a wide-angle light field.

The beam angle of the high-speed infrared emitting diode is 100-130 DEG

In conclusion, the special structure of the light shading plate is arranged, the assembling distance between the light shading plate and the photocell monomer is shortened, the light shading plate can shade more stray light, the light radiation intensity of the part, which is not shaded by the photocell monomer, is increased, and the detection precision of the photocell monomer is improved.

Drawings

Preferred embodiments of the present application will now be described in further detail with reference to the accompanying drawings, in which:

fig. 1 is a schematic perspective view of a galvanometer motor according to an embodiment of the present disclosure;

FIG. 2 is a schematic perspective view of a sub-assembly of a galvanometer motor including a drive-by-wire unit and a housing unit;

FIG. 3 isbase:Sub>A sectional view taken along line A-A of FIG. 2;

fig. 4 is a schematic perspective view of a control panel bearing seat according to an embodiment of the present application;

fig. 5A is a schematic perspective view of a housing unit according to an embodiment of the present application;

FIG. 5B is a schematic view of the V-directional structure of FIG. 5A;

FIG. 6 isbase:Sub>A partial sectional view taken along line A-A of FIG. 2;

fig. 7 is a schematic structural diagram of a PCB and a light shielding plate according to an embodiment of the present application;

FIG. 8 is a schematic view of a partial structure of a PCB and a light shielding plate in an operating state according to an embodiment of the present application; and

fig. 9 is a schematic perspective view of a light shielding plate according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the following detailed description, reference is made to the accompanying drawings that form a part hereof, and in which is shown by way of illustration specific embodiments of the application. In the drawings, like numerals describe substantially similar components throughout the different views. Various specific embodiments of the present application are described in sufficient detail below to enable those skilled in the art to practice the teachings of the present application. It is to be understood that other embodiments may be utilized and structural, logical or electrical changes may be made to the embodiments of the present application.

Fig. 1 is a schematic perspective view of a galvanometer motor according to an embodiment of the present disclosure. As shown in fig. 1, the present application provides a galvanometer motor 100, which includes a line control unit 101, a housing unit 102 and a lens unit 103, which are connected in sequence, wherein the line control unit 101 is used for controlling the rotation of the galvanometer motor, a rotor assembly and a stator assembly are arranged inside the housing unit 102, and a lens 104 on the lens unit 103 is used for manipulating a light beam at a laser radar emitting end. Fig. 2 is a schematic perspective view of a sub-assembly of the galvanometer motor including a drive-by-wire unit and a housing unit. Fig. 3 isbase:Sub>A sectional view taken along linebase:Sub>A-base:Sub>A of fig. 2. Referring to fig. 2 and 3, the housing unit 102 includes a casing 200, one end of the casing 200 is connected to a control board bearing seat 201, and the other end is connected to a lens bearing seat 202, and the casing 200 is provided with a winding (not shown) and a rotor assembly inside. The rotor assembly comprises a rotating shaft 203 arranged in the housing unit 102 in a penetrating mode, a first end of the rotating shaft 203 is connected with the lens unit 103, a limiting transverse shaft 204 radially penetrates through a position close to a second end of the rotating shaft 203, two ends of the rotating shaft 203 are fixed on the housing unit 102 through a first bearing 205 and a second bearing 206 respectively, the limiting transverse shaft 204 and the first bearing 205 are contained in the control panel bearing seat 201, and the second bearing 206 is contained in the lens bearing seat 202.

In the embodiment of the application, the control panel bearing seat, the casing and the lens bearing seat are designed in a split mode, so that when parts in the mirror vibrating motor are installed and assembled, under the condition that the relative position between the control panel bearing seat, the lens bearing seat and the rotor assembly is determined, the accuracy of the relative position between the mirror vibrating motor casing and the lens unit can be achieved through a mode of simply adjusting the position of the casing. And because the relative position of control panel bearing frame, lens bearing frame and pivot is unchangeable, so the concentricity of control panel bearing frame, lens bearing frame and casing can keep unchangeable, and then makes the concentricity of the part in the mirror motor that shakes obtain improving.

As shown in fig. 2, a fixing plate 207 is protruded from the outer side of the casing 200 along the tangential direction of the outer periphery, and a fixing hole 208 for connecting with an external device is opened on the fixing plate 207. The external device is connected to the galvanometer motor through a fixing plate 207, and in some embodiments, the external device may optionally include a laser emitting end. Because the mirror motor that shakes is handled laser beam through the lens unit, so, for the irradiation range of the light beam after the lens reflection laser beam in the lens unit within the scope of predetermineeing, the required precision that the contained angle of fixed plate and lens action face should satisfy certain angle, and the contained angle scope of the two generally is: 1 deg. In the embodiment of this application, because control panel bearing frame, casing and lens bearing frame are the components of a whole that can function independently design, so in the mirror motor assembling process that shakes, can make the one end of casing and control panel bearing frame carry out incomplete fixed connection earlier, the other end fixed connection of lens bearing frame and casing, can make the contained angle of fixed plate and lens working face satisfy the requirement of predetermineeing through the mode of rotating the casing afterwards. Like this, satisfying under the requirement of concentricity, can also improve the accuracy of the angle of fixing base and lens on the casing.

Fig. 4 is a schematic perspective view of a control panel bearing seat according to an embodiment of the present application. As shown in fig. 4 and 3, the control board bearing housing includes a first cylinder 301 and a second cylinder 302 connected to each other, the first cylinder 301 having a cross-sectional area larger than that of the second cylinder 302, the first cylinder 301 being connected to the PCB board 209 disposed at one side of the control board bearing housing, and an outer side 306 of the second cylinder 302 being connected to the inner wall 210 of the rear port of the cabinet 200. In some embodiments, the outer side 306 of the secondary post 302 optionally has a clearance fit with the inner wall 210 of the rear port of the housing 200, which facilitates fine adjustment of the housing 200 during the transfer process, thereby allowing the housing to be positioned more accurately relative to the lenses in the lens units.

Further, a groove 303 is formed in the first column 301, the groove 303 is used for accommodating the limiting transverse shaft 204 inserted on the rotating shaft 203, a bearing chamber 304 is formed in the second column 302, the bearing chamber 304 is communicated with the groove 303, the bearing chamber 304 is used for accommodating the first bearing 205 sleeved on the rotating shaft 203, and the first bearing 205 is fixedly connected with the inner wall of the bearing chamber 304 in a clearance fit manner.

Fig. 5A is a schematic perspective view of a housing unit according to an embodiment of the present application; fig. 5B is a schematic view of the V-directional structure of fig. 5A. As shown in fig. 5A, the housing unit 102 further includes a flexible limiting pad 501, the flexible limiting pad 501 is embedded on the bearing plate control seat 201, and the control plate bearing seat 201 is disposed on the casing 200 near the second end of the rotating shaft 203. One or more limiting grooves 502 are formed in the outer edge of the flexible limiting pad 501, and the positions of the limiting grooves 502 correspond to the positions of the first clamping grooves 305 on the bearing plate control seat 201. When the first engaging groove 305 is embedded in the limiting groove 502, the flexible limiting pad 501 is prevented from rotating in the axial direction in the bearing plate control seat 201.

As shown in fig. 5B, the flexible limiting pad 501 further comprises a limiting through hole 503 for receiving the limiting transverse shaft 204. The middle of the limiting through hole 503 may be a circular through hole with fan-shaped ends. The limiting through hole 503 limits the limiting transverse shaft 204 to swing in a sector area, and prevents the rotating shaft 203 from over-rotating. Wherein the swing angle A of the limit transverse shaft 204 is 30-40 degrees, and preferably, the swing angle A of the limit transverse shaft 204 is 32 degrees. Those skilled in the art will appreciate that the swing angle of the limit transverse shaft 204 can be set according to practical situations, and is not limited herein.

In one embodiment, the flexible limiting pad 501 is made of rubber, and the rubber can buffer the impact force of the limiting transverse shaft 204. At the moment of electrifying the galvanometer motor, the rotating shaft 203 can rotate and has large impact force, and if the long-term limiting transverse shaft 204 is in hard contact with the rigid limiting pad, the limiting through hole in the rigid limiting pad can be deformed, so that the swinging angle of the rotating shaft 203 is inaccurate. In addition, the limiting cross shaft 204 is in hard contact with the rigid limiting pad, so that the working noise is increased. Therefore, the spacing pad in this application is flexible spacing pad, has both reduced the noise, has to guarantee that pivot 203 swing angle is accurate, has improved the job stabilization nature of mirror motor that shakes.

Fig. 6 isbase:Sub>A partial sectional view taken along linebase:Sub>A-base:Sub>A of fig. 2. As shown in fig. 6, the drive-by-wire unit 101 includes a PCB board 209, a light shielding plate 601, a rear cover 602, and a light source 603. The PCB 209 is provided with a through hole which is in clearance fit with the rotating shaft 203, a plurality of photocell monomers 604 are arranged on one side of the PCB 209 facing the second end of the rotating shaft 203, and the shading plate 601 is in interference fit with the end part of the second end of the rotating shaft 203. The existing shading plate is generally in clearance fit with the rotating shaft 203 and then fixed by adopting a gluing mode. In the application, the shading plate 601 is directly in interference fit with the rotating shaft 203, the gluing step is omitted, and the shading plate has the advantages of simplicity in assembly, stable structure, reliability in process and the like.

The rear cover 602 is fixed to the housing unit through a PCB board 209, the light source 603 is fixed to the rear cover 602 through a light source circuit board 605, and the light source circuit board 605 is electrically connected to the PCB board 209. When the rear cover 602 is fixed to the housing unit, the inner cavity thereof and the PCB 209 enclose a closed space. The rear cover 602 is made of opaque material, so as to avoid the influence of external light on the light sensed by the single photocell 604 and improve the detection accuracy of the photocell.

The light source 603 is located on an extension of the center line of the through hole, and the light blocking plate 601 is disposed between the light source 603 and the plurality of photovoltaic cells 604. The light shielding plate 601 can rotate with the rotating shaft 203, and the light shielding plate 601 detects the rotation angle by changing the area of the plurality of photocells 604 irradiated by the light source 603. The light shielding plate 601 may be a fan-shaped thin plate made of non-reflective opaque material, and functions to shield light.

According to one embodiment of the present application, the light sources 603 are electrically connected to the light source circuit board 605 using a SMT pad process. The light source 603 and the light source circuit board are electrically connected by using the SMT process, so that the volume of the light source 603 can be reduced, the distance between the light source 603 and the photocell monomer 604 is prolonged, and the irradiation range of the light source 603 is enlarged. Referring to fig. 6, the projected spot range of the light source 603 is larger than the setting range of the plurality of photocells 604. When the range of the projected light spot of the light source 603 is larger than the setting range of the plurality of photocell monomers 604, the influence of light scattering emitted by the light source can be weakened, so that the intensity of light is more concentrated on the photocell monomers 604, the detection error of the photocell monomers 604 is reduced, and the working stability of the photocell monomers 604 is improved.

According to one embodiment of the present application, the light source 501 may be a high-speed infrared emitting diode capable of uniformly generating a wide-angle light field. Wherein the beam angle B of the high-speed infrared emission diode is 100-130 degrees, preferably, the beam angle B of the high-speed infrared emission diode is 120 degrees. The high-speed infrared emitting diode has the advantages of small volume, large beam angle, more uniform emitted light, low cost and the like.

According to an embodiment of the present application, the back cover 602 is provided with a light passing hole 606 formed by a surrounding plate, the light source 603 is disposed in the light passing hole 606, the surrounding plate is in a truncated cone shape, and the upper mesa of the truncated cone covers the light source 603 and the lower mesa of the truncated cone to house the plurality of photovoltaic cells 604 therein. The light through hole 606 is designed to be in a truncated cone shape, so that light spots projected by the light source 603 are gathered on the plurality of photocell monomers 604, light fields formed by the light source 603 are prevented from being shielded, and the range of the light spots projected by the light source 603 is larger than the setting range of the plurality of photocell monomers 604.

Fig. 7 is a schematic structural diagram of a PCB board and a light shielding plate according to an embodiment of the present application. Fig. 8 is a schematic partial structure diagram of a PCB and a light shielding plate in an operating state according to an embodiment of the present application. As shown in fig. 7, when there are 4 photovoltaic cells 604, the plurality of photovoltaic cells includes photovoltaic cells 604A, 604B, and the photovoltaic cells 604A, 604B are symmetrically disposed around the through hole. Further, the diagonally distributed 604A and 604A groups are electrically connected to one group, the diagonally distributed 604B and 604B groups are electrically connected to the other group, and the two groups of the photovoltaic cells 604 are connected in parallel. The photovoltaic cells 640 of the same group are distributed in the diagonal direction, so that the linearity error can be reduced, and the working error of the photovoltaic cells 604 can be improved.

According to one embodiment of the present application, the photovoltaic cells 604 are SMD packaged PIN silicon photodiodes for receiving infrared light having a range of wavelengths. The SMD packaged PIN silicon photodiode is pasted on the PCB 209 by adopting the SMT process, so that the reliability of the photocell monomer 604 is improved, and the requirements of vehicle specifications can be met. The PIN silicon photodiode is used as the single photovoltaic cell 604, so that the size of the single photovoltaic cell 604 can be reduced, and the cost is lower.

As shown in fig. 8, a light shielding plate 601 is disposed on the plurality of photocells 604 for shielding light from the light source. The output current of the photovoltaic cell 604 is proportional to the total radiant energy on its active surface. With constant light intensity, the photovoltaic cells 604 output a current proportional to the area exposed to the light.

Referring to FIG. 8, when the photovoltaic cells 604 are designed in pairs and are diagonally distributed, the light shield 601 rotates counterclockwise, the exposed areas of the photovoltaic cells 604B, 604B increase, the exposed areas of the photovoltaic cells 604A, 604A decrease, and then the currents generated by the two sets of photovoltaic cells 604 are summed and connected to the opposite side of the differential amplifier, resulting in a directional linear signal. Wherein the linear signal is capable of indicating the angular position of the shaft. To ensure that the output signal is linear, the increased exposed area on one set of photocells 604 is the same as the decreased exposed area on the other set of photocells 604. The diagonal design of the two groups of photocell monomers 604 can eliminate the manufacturing and assembling errors of all parts in the axial direction and the radial direction, and further improve the stability of the photocell output linear signals.

Fig. 9 is a schematic perspective view of a light shielding plate according to an embodiment of the present application. As shown in fig. 9, the light shielding plate 601 includes: the light shielding plate comprises a shielding part 902 and a fixing part 901 which is arranged along the center of one side surface of the shielding part 902 in an outward protruding mode, wherein a positioning hole 911 for fixing the light shielding plate 601 is arranged in the fixing part 901. The fixing portion 901 is used to fix the light shielding plate 601 at the end of the rotation shaft. The fixing portion 901 is a hollow cylinder, and a positioning hole 911 formed in the middle of the fixing portion 901 is used for interference fit between the light shielding plate 601 and the rotating shaft. Further, the shielding portion 902 includes a first sector plate 903 and a second sector plate 904, which are symmetrically disposed on both sides of the fixing portion 901. Wherein the first sector plates 903 and the second sector plates 904 are identical in shape and size to ensure that the area change is the same across both pairs of photovoltaic cells 604.

According to an embodiment of the present application, since the fixing portion 901 is disposed to protrude outward along the center of one side surface of the shielding portion 902, the lower surfaces of the first fan-shaped plate 903 and the second fan-shaped plate 904 are flush with the bottom surface of the fixing portion 901, so that the assembly distance between the light shielding plate 601 and the single photovoltaic cell 604 can be shortened, the light shielding plate 601 can shield more stray light, the light radiation intensity of the portion of the single photovoltaic cell 604 that is not shielded is increased, and the detection accuracy of the single photovoltaic cell 604 is increased. In one embodiment, the mounting distance between the light shielding plate 601 and the photovoltaic cell 604 can be 0.1-0.4mm, and preferably, the mounting distance between the light shielding plate 601 and the photovoltaic cell 604 is 0.1mm. When the assembly distance between the light shielding plate 601 and the single photocell 604 is 0.1mm, the interference of most stray light can be avoided, and the detection precision of the single photocell 604 is greatly improved.

To sum up, this application embodiment sets up through the fixed part with the light screen along shielding part side surface center to the evagination, makes the lower surface of the first sector plate of light screen and second sector plate and the bottom surface of fixed part keep the parallel and level, effectively shortens the light screen and the free fitting distance of photocell for the light screen can shelter from more stray light, has increased the photocell monomer simultaneously and has not sheltered from partial light radiation intensity, has improved the free detection precision of photocell. Furthermore, the limiting pad in the application is a flexible limiting pad, so that noise is reduced, the accuracy of the swing angle of the rotating shaft can be guaranteed, and the working stability of the mirror motor is improved.

The above-described embodiments are provided for illustrative purposes only and are not intended to be limiting, and various changes and modifications may be made by those skilled in the art without departing from the scope of the present disclosure, and therefore, all equivalent technical solutions should fall within the scope of the present disclosure.

Claims (12)

1. A mirror motor that shakes, includes drive-by-wire unit, housing unit and lens unit, its characterized in that, the drive-by-wire unit includes: the photovoltaic module comprises a PCB with a plurality of photovoltaic cells, a light shading plate and a light source, wherein the light shading plate is arranged between the light source and the plurality of photovoltaic cells; the light shielding plate includes: the shading plate comprises a shading part and a fixing part which is arranged along the center of the surface of one side of the shading part in an outward protruding mode, wherein a positioning hole used for fixing the shading plate is formed in the fixing part.

2. The galvanometer motor of claim 1, wherein the shield portion comprises a first sector plate and a second sector plate symmetrically disposed on either side of the fixed portion.

3. The galvanometer motor of claim 1, wherein the housing unit comprises: the lens unit is connected with a first end of the rotating shaft, and a limiting transverse shaft radially penetrates through a second end close to the rotating shaft; and

flexible spacing pad and control panel bearing frame, flexible spacing pad inlays to be established on the control panel bearing frame, the control panel bearing frame inlays to be established casing one side, be equipped with spacing through-hole on the flexible spacing pad, be used for holding spacing cross axle is in order to cushion the offend of spacing cross axle.

4. The galvanometer motor of claim 3, wherein the flexible limiting pad is made of rubber.

5. A galvanometer motor as in claim 1, wherein the mounting spacing between the shutter plate and the photocell cell is 0.1-0.4mm.

6. The galvanometer motor of claim 3, wherein the PCB board is in clearance fit with the second end of the shaft through a through hole; the light screen is in interference fit with the end of the second end.

7. The galvanometer motor of claim 1, wherein the drive-by-wire unit further comprises a rear cover fixed to the housing unit by the PCB board; the light source is fixed on the rear cover through the light source circuit board, and the range of the projected light spot of the light source is larger than the setting range of the plurality of photocell monomers.

8. The galvanometer motor of claim 7, wherein the light source is electrically connected to the light source circuit board using an SMT pick and place process.

9. A galvanometer motor according to claim 7, wherein the rear cover is provided with a light passing hole formed by a surrounding plate, the light source is arranged in the light passing hole, the surrounding plate is arranged in a cone frustum shape, and the upper table surface of the cone frustum covers the light source and the lower table surface to arrange the plurality of photocell monomers inside.

10. A galvanometer motor as in claim 1, wherein the photocell cells are SMD packaged PIN silicon photodiodes for receiving infrared light having a wavelength within a certain range.

11. A galvanometer motor as recited in claim 1, wherein the light source is a high speed infrared emitting diode capable of uniformly generating a wide angle light field.

12. A galvanometer motor as set forth in claim 11, wherein said high speed infrared emitting diode has a beam angle of 100 ° to 130 °.

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