Distance measuring device

Abstract

The present invention relates to a distance measuring device. A pair of deflecting mirrors (211) are arranged on both sides of a mirror support body (212). A pair of partition plates (22) are arranged to clamp the pair of deflecting mirrors and the mirror support body from both sides in a manner orthogonal to the reflection surfaces of the pair of deflecting mirrors. A clamp (23) clamps and fixes the pair of deflecting mirrors, the mirror support body and the pair of partition plates. A motor (24) rotates them. The pair of partition plates include: a plate-like portion (22a), which is a plate-like portion extending along a plane orthogonal to a rotation axis in a manner that divides the reflection surface into two areas; and an upright setting portion (22b), which is uprightly set along the reflection surface from a position in the plate-like portion opposite to the reflection surface. The clamp clamps the pair of deflecting mirrors and the mirror support body via the upright setting portion in a direction orthogonal to the reflection surface.

Description

Technical Field

[0001] The present invention relates to a distance measuring device provided with a deflecting mirror. Background Art

[0002] There is a distance measuring device that irradiates a transmission wave and detects a reflected wave of the irradiated transmission wave from an object to detect the distance of the object. In this distance measuring device, a deflecting mirror that is driven to rotate is used, and the transmission wave output from the transmission unit is reflected by the deflecting mirror and emitted in a direction corresponding to the rotation angle of the deflecting mirror, thereby scanning a preset scanning range. The reflected wave of the transmission wave from the object is reflected by the deflecting mirror and detected by the receiving unit.

[0003] Patent document 1 describes a deflecting mirror device in a laser radar device that deflects and scans light. The deflecting mirror device includes a pair of deflecting mirrors and a mirror support body, and the pair of deflecting mirrors are arranged on the mirror support body on the opposite side of the mirror support body. In the deflecting mirror device, since the same deflecting mirror is used to deflect the transmission light beam and the reflection light beam, a separation wall is provided on the reflection surface of the deflecting mirror. The separation wall is a partition plate that suppresses the optical short circuit between the transmission part side and the reception part side. The separation wall has an edge portion that is opposite to the reflection surface of each deflecting mirror, that is, a linear edge portion, and a fastening web formed at both ends of the linear edge portion. The separation wall is engaged with each deflecting mirror via the linear edge portion and is fixed to the mirror support body on the fastening web.

[0004] Patent Document 1: Japanese Patent Application No. 2018-500603

[0005] In the technology described in Patent Document 1, when installing the partition plate on a pair of deflection mirrors and a mirror support, it is necessary to engage the partition plate with each deflection mirror via a linear edge portion and screw the fastening web to the mirror support. As a result of detailed research by the inventors, it was found that it is not easy to assemble the partition plate in such an installation method. Summary of the invention

[0006] One aspect of the present invention is to provide a technology capable of easily assembling a partition plate to a pair of deflecting mirrors and a mirror support body.

[0007] One embodiment of the present invention is a distance measuring device, which includes a pair of deflecting mirrors, a mirror support, a pair of partition plates, a clamp and a motor. The mirror support is a plate-like component having shapes corresponding to the shapes of the reflecting surfaces of the pair of deflecting mirrors on both sides, and a pair of deflecting mirrors are arranged on both sides of the plate-like component. A pair of partition plates are arranged to clamp the pair of deflecting mirrors and the mirror support from both sides in a manner orthogonal to the reflecting surface. The clamp clamps and fixes the pair of deflecting mirrors, the mirror support and the pair of partition plates. The motor rotates the pair of deflecting mirrors, the mirror support, the pair of partition plates and the clamp. The pair of partition plates includes a plate-like portion and an upright setting portion. The plate-like portion is a plate-like portion extending along a plane orthogonal to the rotation axis in a manner that divides the reflecting surface into two areas. The upright setting portion is uprightly arranged along the reflecting surface from a position in the plate-like portion that is opposite to the reflecting surface. The clamp clamps the pair of deflecting mirrors and the mirror support via the upright setting portion in a direction orthogonal to the reflecting surface.

[0008] According to such a configuration, the partition plate can be easily assembled to the pair of deflecting mirrors and the mirror support body. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a stereoscopic diagram showing the appearance of a laser radar device.

[0010] Figure 2 This is an exploded perspective view of a laser radar device.

[0011] Figure 3 This is a three-dimensional diagram showing the structure of a light detection module housed in a housing of a laser radar device.

[0012] Figure 4 This is an exploded perspective view of the mirror module, partition plate, and fixture in the scanning unit.

[0013] Figure 5A This is a perspective view of the partition plate viewed from the surface.

[0014] Figure 5B This is a diagram of the partition plate viewed from the side.

[0015] Figure 5C This is a perspective view of the partition plate viewed from the back.

[0016] Figure 6 This is a diagram showing a portion of a mirror module, a partition plate, and a jig in a scanning unit as viewed from the reflection surface side of a deflecting mirror. DETAILED DESCRIPTION

[0017] Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings.

[0018] [1.Structure]

[0019] Figure 1The laser radar device 1 shown is a distance measuring device that emits light and receives its reflected light to measure the distance to an object. The laser radar device 1 is mounted on a vehicle and used to detect various objects in front of the vehicle. Laser radar is also recorded as LIDAR. LIDAR is the abbreviation of Light Detection and Ranging.

[0020] like Figure 1 As shown, the laser radar device 1 includes a housing 100 and an optical window 200. The housing 100 is a box made of resin and formed in a rectangular parallelepiped shape with one surface opened.

[0021] Hereinafter, the direction along the long side of the opening of the housing 100 having a substantially rectangular shape is defined as the X-axis direction, the direction along the short side of the opening is defined as the Y-axis direction, and the direction orthogonal to the X-Y plane is defined as the Z-axis direction. In addition, when the laser radar device 1 is installed on the vehicle in a manner that the X-Z plane is horizontal and viewed from the opening side of the housing 100, the left and right in the X-axis direction and the top and bottom in the Y-axis direction are defined. In addition, with respect to the front and back in the Z-axis direction, the opening side of the housing 100 is defined as the front, and the depth side is defined as the back.

[0022] like Figure 2 As shown, the light detection module 2 is housed inside the housing 100 . The light detection module 2 includes a light projecting unit 10 , a scanning unit 20 , and a light receiving unit 30 .

[0023] [2. Scanning unit]

[0024] like Figure 3 as well as Figure 4 As shown in FIG. 1 , the scanning unit 20 includes a mirror module 21, a pair of partition plates 22, a clamp 23, and a motor 24. The pair of partition plates 22 are fixed to the mirror module 21 by the clamp 23. The mirror module 21 is vertically arranged on the motor 24. The mirror module 21, the pair of partition plates 22, and the clamp 23 are arranged to Figure 6 The motor 24 is driven to rotate the rotating shaft indicated by the dot-dash line.

[0025] [3. Mirror module, partition plate and fixture]

[0026] The mirror module 21 includes a pair of deflecting mirrors 211 and a mirror support body 212 .

[0027] The pair of deflecting mirrors 211 are flat plate-shaped members having reflecting surfaces for reflecting light.

[0028] The mirror support body 212 includes a circular plate portion 212a and a mounted portion 212b. The circular plate portion 212a is a circular plate-shaped portion, the center of which is fixed to the rotation axis of the motor 24. The mounted portion 212b is a plate-shaped portion having a pair of deflection mirrors 211 disposed on both sides, and is vertically mounted on the circular surface of the circular plate portion 212a.

[0029] The pair of deflecting mirrors 211 has a shape in which two rectangles having different widths in the long-side direction are integrated. Specifically, the pair of deflecting mirrors 211 has a shape in which a first rectangle and a second rectangle having a width in the long-side direction longer than the first rectangle are aligned along the central axis in the short-side direction of each rectangle and arranged along the central axis for integration. Hereinafter, in the pair of deflecting mirrors 211, the portion corresponding to the first rectangle is referred to as a narrow width portion, and the portion corresponding to the second rectangle is referred to as a wide width portion.

[0030] The shape of the installation surface of the pair of deflection mirrors 211 in the installed portion 212 b corresponds to the shape of the pair of deflection mirrors 211 .

[0031] like Figures 4 to 6 As shown, the pair of partition plates 22 is a plate that divides a circular plate-shaped member having the same diameter as the width in the long-side direction of the wide portion of the pair of deflection mirrors 211 into two semicircular portions. The pair of partition plates 22 are fixed to the mirror module 21 in a state where they sandwich the pair of deflection mirrors 211 from both sides in a manner orthogonal to the reflection surface.

[0032] The partition plate 22 includes a plate-shaped portion 22a and a standing portion 22b. The plate-shaped portion 22a is a semicircular plate-shaped portion and is arranged along a plane perpendicular to the rotation axis so as to divide the reflection surface of the deflection mirror 211 into two regions, a narrow width portion and a wide width portion.

[0033] The upright portion 22b is a portion of the plate-shaped portion 22a that is arranged upright along the reflecting surface and faces the reflecting surface of the deflecting mirror 211. Figure 5A As shown, the surface where the upright setting portion 22b exists is set as the surface, as shown in FIG. Figure 5C As shown, the surface on which the upright portion 22b does not exist is set as the back surface.

[0034] like Figure 4 As shown in FIG. 2 , the clamp 23 has a U-shaped shape including a base 23a and a pair of gripping portions 23b extending from the base 23a. Figure 6 As shown, the pair of clamps 23 hold the pair of deflection mirrors 211 and the mirror support 212 via the upright portions 22b at both ends of the narrow width portion of the pair of deflection mirrors 211 in the direction perpendicular to the rotation axis. Thus, the pair of partition plates 22 are fixed to the mirror module 21.

[0035] When the pair of partition plates 22 are fixed to the mirror module 21, a portion of the plate-shaped portion 22a is located on the side of the side of the set portion 212b where the step difference between the narrow width portion and the wide width portion is formed. Specifically, the side is a side that is continuous with the side of the portion corresponding to the narrow width portion among the side of the portion corresponding to the wide width portion in the set portion 212b that is orthogonal to the rotation axis. Both ends of the portion of the plate-shaped portion 22a that forms the upright set portion 22b are located on the side.

[0036] Hereinafter, the portion of the pair of deflecting mirrors 211 that is above the pair of partition plates 22, i.e., the portion on the narrow width side, is referred to as the light projection deflection portion 20a, and the portion of the pair of partition plates 22 that is below the pair of partition plates 22, i.e., the portion on the wide width side, is referred to as the light receiving deflection portion 20b.

[0037] like Figure 4 as well as Figure 6 As shown, the disposed portion 212b of the mirror support body 212 includes: a pair of mirror limiting portions 213, a pair of convex portions 214, and a pair of guide portions 215. The pair of mirror limiting portions 213 and the pair of guide portions 215 are formed on the side surfaces of the disposed portion 212b corresponding to the narrow width portion and sandwiching the rotation axis. In addition, the pair of convex portions 214 are formed on the side surfaces of the disposed portion 212b forming the step difference between the narrow width portion and the wide width portion.

[0038] The partition plate 22 includes a pair of clamp restricting portions 216 and a pair of recessed portions 217. Figure 5A as well as Figure 5B As shown in FIG. 1 , a pair of clamp limiting portions 216 are formed on the surface of the plate-shaped portion 22a. Figure 5C As shown, a pair of recessed portions 217 are formed on the back surface of the plate-like portion 22a.

[0039] like Figure 6 As shown, the pair of clamp limiting parts 216 are protrusions erected from the surface of the plate-shaped part 22a at a position farther from the rotation axis than the position of the base 23a of the clamp 23. The pair of clamp limiting parts 216 contact the clamp 23 in a manner of sandwiching the base 23a between the mirror module 21, thereby limiting the movement of the clamp 23 in the direction orthogonal to the rotation axis in the reflection surface.

[0040] like Figure 4 As shown, the pair of mirror restricting portions 213 are protrusions protruding from the side surfaces on both sides of the rotation axis in the portion of the set portion 212b corresponding to the narrow width portion toward the pair of deflecting mirrors 211. Figure 6 As shown, the pair of mirror restricting portions 213 contact the pair of deflecting mirrors 211 at both sides of the narrow width portion in the direction perpendicular to the rotation axis, and restrict movement of the pair of deflecting mirrors 211 in the direction perpendicular to the rotation axis on the reflection surface.

[0041] like Figure 4 As shown, the pair of convex parts 214 are protrusions protruding from the side of the set portion 212b forming the step difference between the narrow width part and the wide width part toward the pair of deflection mirrors 211. The pair of convex parts 214 contact the deflection mirror 211 on the side of the deflection mirror 211 forming the step difference between the narrow width part and the wide width part, and restrict the movement of the pair of deflection mirrors 211 in the direction from the wide width part to the narrow width part, that is, in the upward direction.

[0042] The pair of recessed portions 217 are formed on the back surface of the plate-shaped portion 22a at positions facing the pair of convex portions 214 of the mirror support 212. The pair of recessed portions 217 and the pair of convex portions 214 are engaged with each other, thereby restricting the movement of the partition plate 22.

[0043] The pair of guide portions 215 are protrusions that protrude from the side surfaces of the two sides of the rotating shaft in the portion corresponding to the narrow width portion of the set portion 212b toward the pair of deflection mirrors 211, and are located below the pair of mirror restricting portions 213. Figure 6 As shown, the pair of guides 215 contact the pair of deflection mirrors 211 at both sides of the narrow width portion in the direction perpendicular to the rotation axis, restricting the movement of the pair of deflection mirrors 211 in the direction perpendicular to the rotation axis in the reflection surface. In addition, the pair of guides 215 contact the clamp 23 in a manner of sandwiching the clamp 23 between the plate-shaped portion 22a, restricting the movement of the clamp 23 in the direction parallel to the rotation axis.

[0044] [4.Light projection part]

[0045] like Figure 3 As shown, the light projecting unit 10 includes a pair of light emitting modules 11 and 12. The light projecting unit 10 may include a light projection reflecting mirror 15.

[0046] The light emitting module 11 includes a light source 111 and a light emitting lens 112, which are arranged opposite to each other. The light source 111 uses a semiconductor laser. The light emitting lens 112 is a lens that narrows the beam width of the light emitted from the light source 111. Similarly, the light emitting module 12 includes a light source 121 and a light emitting lens 122. Since the light emitting module 12 is the same as the light emitting module 11, the description thereof is omitted.

[0047] The light projection and reflection mirror 15 is a mirror that changes the traveling direction of light.

[0048] The light emitting module 11 is arranged so that light output from the light emitting module 11 directly enters the light projection and deflection unit 20 a .

[0049] The light emitting module 12 is arranged so that the traveling direction of light outputted from the light emitting module 12 is bent by approximately 90 degrees by the light projection return mirror 15 and the light is incident on the light projection deflection unit 20 a .

[0050] Here, the light emitting module 11 is configured to output light from left to right in the X-axis direction, and the light emitting module 12 is configured to output light from back to front in the Z-axis direction. In addition, the light reflection mirror 15 is configured not to block the path of light from the light emitting module 11 toward the light projection deflection unit 20a.

[0051] [5. Light receiving part]

[0052] The light receiving unit 30 includes a light receiving element 31. The light receiving unit 30 may include a light receiving lens 32 and a light receiving reflecting mirror 33.

[0053] The light receiving element 31 has an APD array in which a plurality of APDs are arranged in a row. APD is an avalanche photodiode.

[0054] The light receiving lens 32 is a lens that reduces the light received from the light receiving deflection unit 20 b .

[0055] The light receiving reflection mirror 33 is disposed on the left side of the light receiving lens 32 in the X-axis direction and is a mirror that changes the traveling direction of light. The light receiving element 31 is disposed below the light receiving reflection mirror 33 .

[0056] The light receiving reflection mirror 33 is arranged to bend the path of light downward by approximately 90 degrees so that light incident from the light receiving deflection unit 20 b via the light receiving lens 32 reaches the light receiving element 31 .

[0057] The light receiving lens 32 is disposed between the light receiving deflection unit 20b and the light receiving folding mirror 33. The light receiving lens 32 focuses the light beam incident on the light receiving element 31 so that the beam diameter thereof becomes approximately equal to the element width of the APD.

[0058] [6. Operation of the light detection module]

[0059] The light output from the light emitting module 11 is incident on the light projection deflection unit 20a. In addition, the traveling direction of the light output from the light emitting module 12 is bent by approximately 90° by the light projection return mirror 15 and is incident on the light projection deflection unit 20a. The light incident on the light projection deflection unit 20a is emitted in a direction corresponding to the rotation angle of the mirror module 21 via the optical window 200. The range of light irradiated via the mirror module 21 is the scanning range. For example, the forward direction along the Z axis is set to 0 degrees, and the range of ±60° extending along the X axis direction can be set as the scanning range.

[0060] The reflected light from the object in the predetermined direction corresponding to the rotation position of the mirror module 21, i.e., the emission direction of the light from the projecting light deflection unit 20a, passes through the optical window 200 and is reflected by the receiving light deflection unit 20b. Then, the reflected light is received by the light receiving element 31 via the receiving lens 32 and the receiving light reflecting mirror 33.

[0061] [7. Effect]

[0062] According to the above-described detailed embodiments, the following effects are obtained.

[0063] (7a) In the laser radar device 1, the pair of deflecting mirrors 211 and the mirror support body 212 are held by the pair of clamps 23 via the upright setting portion 22b, so that the pair of partition plates 22 are fixed to the mirror module 21. According to such a structure, the partition plates 22 can be easily assembled to the pair of deflecting mirrors 211 and the mirror support body 212 only by clamping the pair of deflecting mirrors 211, the mirror support body 212 and the pair of partition plates 22 with the clamps 23.

[0064] (7b) In the laser radar device 1, the pair of partition plates 22 are provided with a clamp limiting portion 216. The clamp limiting portion 216 is a protrusion provided upright from a position of the plate-shaped portion 22a that is farther from the rotation axis than the position of the base portion 23a of the clamp 23, and limits the movement of the clamp 23 in a direction perpendicular to the rotation axis on the reflection surface. Thus, when the partition plates 22 are assembled to the mirror module 21 by the clamp 23, the deviation of the clamp 23 in a direction perpendicular to the rotation axis on the reflection surface can be suppressed, thereby improving the assembly accuracy.

[0065] (7c) In the laser radar device 1, the mirror support body 212 includes a pair of mirror limiting parts 213. The pair of mirror limiting parts 213 are protrusions that protrude from the side surfaces on both sides of the rotation axis in the portion corresponding to the narrow width portion of the set portion 212b toward the pair of deflection mirrors 211, and limit the movement of the pair of deflection mirrors 211 in the direction perpendicular to the rotation axis on the reflection surface. As a result, the pair of deflection mirrors 211 can be prevented from deviating in the direction perpendicular to the rotation axis on the reflection surface, thereby improving assembly accuracy and making assembly easier.

[0066] (7d) In the laser radar device 1, a portion of the plate-shaped portion 22a of the partition plate 22 is located on the side surface of the side surface of the installed portion 212b in the mirror support body 212, which forms a step difference between the narrow width portion and the wide width portion. According to such a structure, when the partition plate 22 is assembled to the mirror module 21, the partition plate 22 can be positioned so as to be arranged at a position that divides the reflection surface of the deflecting mirror 211 into two regions, the narrow width portion and the wide width portion, so that assembly can be performed more easily.

[0067] (7e) In the laser radar device 1, the mirror support body 212 has a pair of convex parts 214. The pair of convex parts 214 are protrusions that protrude from the side of the installed part 212b that forms the step difference between the narrow width part and the wide width part toward the pair of deflection mirrors 211, and restrict the movement of the pair of deflection mirrors 211 in the direction from the wide width part to the narrow width part. As a result, it is possible to suppress the pair of deflection mirrors 211 from deviating in the direction from the wide width part to the narrow width part, that is, in the upward direction, so that the assembly accuracy is improved and the assembly can be performed more easily.

[0068] (7f) In the laser radar device 1, the pair of partition plates 22 form a pair of recessed portions 217 at positions on the back side of the plate-like portion 22a that are opposite to the pair of convex portions 214, and the pair of recessed portions 217 engage with the pair of convex portions 214 to restrict movement of the partition plates 22. According to such a structure, when the partition plates 22 are assembled to the mirror module 21, the partition plates 22 can be prevented from deviating in a direction orthogonal to the rotation axis, thereby improving assembly accuracy and making assembly easier.

[0069] (7g) In the laser radar device 1, the mirror support body 212 has a pair of guide parts 215. The pair of guide parts 215 are protrusions protruding from the side surfaces on both sides of the rotation axis in the portion corresponding to the narrow width portion of the set portion 212b toward the pair of deflecting mirrors 211, and are located lower than the pair of mirror limiting parts 213. The pair of guide parts 215 limit the movement of the pair of deflecting mirrors 211 in the direction orthogonal to the rotation axis in the reflection surface. As a result, it is possible to suppress the pair of deflecting mirrors 211 from deviating in the direction orthogonal to the rotation axis in the reflection surface, thereby improving the assembly accuracy and making it easier to assemble. In addition, the pair of guide parts 215 contact the clamp 23 in a manner of clamping the clamp 23 between the plate-shaped portion 22a, thereby limiting the movement of the clamp 23 in the direction parallel to the rotation axis. As a result, when the partition plate 22 is assembled to the mirror module 21 through the clamp 23, it is possible to suppress the clamp 23 from deviating in the direction parallel to the rotation axis, thereby improving the assembly accuracy.

[0070] [8. Other embodiments]

[0071] As mentioned above, although embodiment of this invention was demonstrated, it is needless to say that this invention is not limited to the said embodiment, Various forms can be adopted.

[0072] (8a) In the above embodiment, an example is proposed in which the pair of deflecting mirrors 211, the mirror support body 212, and the pair of partition plates 22 are held by a pair of clamps 23 at both ends in the direction perpendicular to the rotation axis in the narrow width portion of the pair of deflecting mirrors 211. However, for example, the pair of deflecting mirrors 211, the mirror support body 212, and the pair of partition plates 22 may be held by a clamp at one end. In this case, the clamp restricting portion 216 may be formed only on one side of the plate-shaped portion 22a where the clamp is provided.

[0073] (8b) In the above embodiment, the plate-like portion 22a is in a semicircular shape having the same diameter as the width of the wide portion of the pair of deflecting mirrors 211 in the long-side direction, but the shape of the plate-like portion 22a is not limited thereto. For example, the shape of the plate-like portion 22a may be a quadrilateral or the like. In addition, the plate-like portion 22a may protrude further outward than the width of the wide portion of the pair of deflecting mirrors 211 in the long-side direction.

[0074] (8c) In the above embodiment, the installation portion 212 b of the mirror support body 212 includes a pair of mirror restriction portions 213 , but the number of the mirror restriction portions 213 is not limited thereto. For example, two or more pairs of mirror restriction portions 213 may be provided.

[0075] (8d) In the above embodiment, the portion 212b of the mirror support body 212 includes a pair of protrusions 214, and a pair of recesses 217 engaging with the protrusions are formed on the partition plate 22, but the number of the protrusions 214 and the recesses 217 is not limited thereto. For example, the portion 212b of the mirror support body 212 may include only one protrusion 214, and one recess 217 engaging with the protrusion may be formed on the partition plate 22.

[0076] (8e) In the above embodiment, the laser radar device 1 is exemplified as the distance measuring device, but the type of the distance measuring device is not limited to this. For example, the distance measuring device may be a millimeter wave radar device or the like.

[0077] (8f) The function of one component in the above-mentioned embodiment can be dispersed into multiple components, or the functions of multiple components can be integrated into one component. In addition, a part of the structure of the above-mentioned embodiment can be omitted. In addition, at least a part of the structure of the above-mentioned embodiment can be added to or replaced by the structure of other above-mentioned embodiments.

Claims

1. A distance measuring device, wherein: have: a pair of deflecting mirrors; The mirror support body is a plate-like member having shapes corresponding to the shapes of the reflecting surfaces of the pair of deflecting mirrors on both surfaces, and the pair of deflecting mirrors are provided on both surfaces of the plate-like member; A pair of partition plates, arranged to sandwich the pair of deflection mirrors and the mirror support from both sides in a manner orthogonal to the reflection surface; a fixture for clamping and fixing the pair of deflection mirrors, the mirror support body, and the pair of partition plates; and a motor to rotate the pair of deflecting mirrors, the mirror support, the pair of partition plates and the clamp, The clamp is in a U-shaped shape having a base and a pair of gripping portions extending from the base, and the pair of deflecting mirrors and the mirror support body are gripped by the pair of gripping portions via a vertical setting portion at the end of the mirror support body in a direction perpendicular to the rotation axis. The pair of partition plates comprises: a plate-shaped portion extending along a plane perpendicular to the rotation axis in a manner of dividing the reflection surface into two regions; and the upright portion being uprightly arranged along the reflection surface from a position of the plate-shaped portion facing the reflection surface. The clamp clamps the pair of deflecting mirrors and the mirror support body via the upright portion in a direction perpendicular to the reflecting surface.

2. The distance measuring device according to claim 1, wherein: The pair of partition plates include a clamp restricting portion which is a protrusion erected from the plate-like portion at a position farther from the rotation axis than the clamp and restricts movement of the clamp in a direction perpendicular to the rotation axis on the reflection surface.

3. The distance measuring device according to claim 1, wherein: The mirror support body has at least one pair of mirror limiting parts, which are protrusions protruding from both ends of the mirror support body in a direction perpendicular to the rotation axis toward both sides of the pair of deflection mirrors, and are protrusions that limit the movement of the pair of deflection mirrors in the direction perpendicular to the rotation axis in the reflecting surface.

4. The distance measuring device according to claim 2, wherein: The mirror support body has at least one pair of mirror limiting parts, which are protrusions protruding from both ends of the mirror support body in a direction perpendicular to the rotation axis toward both sides of the pair of deflection mirrors, and are protrusions that limit the movement of the pair of deflection mirrors in the direction perpendicular to the rotation axis in the reflecting surface.

5. The distance measuring device according to any one of claims 1 to 4, wherein: The pair of deflecting mirrors comprises: a narrow width portion, which is a portion where the width of the reflecting surface along a direction perpendicular to the rotation axis is narrower than other portions of the reflecting surface; and a wide width portion, which is the other portion. The narrow width portion is formed on either side of the reflecting surface in a direction parallel to the rotation axis. The pair of partition plates are configured to separate the narrow width portion from the wide width portion. A part of the plate-shaped portion is located on a side surface of the mirror support body where a step difference between the narrow width portion and the wide width portion is formed.

6. The distance measuring device according to claim 5, wherein: The mirror support body includes a convex portion which protrudes from a side surface of the mirror support body forming the step toward both sides of the pair of deflection mirrors and restricts movement of the pair of deflection mirrors in a direction from the wide width portion toward the narrow width portion.

7. The distance measuring device according to claim 6, wherein: The pair of partition plates include recessed portions that engage with the convex portions at positions of the plate-shaped portion that face the convex portions.

8. The distance measuring device according to claim 5, wherein: The mirror support body includes a pair of guide portions, which are protrusions protruding from both ends of a portion of the mirror support body corresponding to the narrow width portion in a direction perpendicular to the rotation axis toward both sides of the pair of deflection mirrors, and are protrusions that restrict movement of the pair of deflection mirrors in the direction perpendicular to the rotation axis in the reflection surface. The clamp is sandwiched between the pair of guide portions and the plate-shaped portion, and restricts movement in a direction parallel to the rotation axis.

9. The distance measuring device according to claim 6 or 7, wherein: The mirror support body includes a pair of guide portions, which are protrusions protruding from both ends of a portion of the mirror support body corresponding to the narrow width portion in a direction perpendicular to the rotation axis toward both sides of the pair of deflection mirrors, and are protrusions that restrict movement of the pair of deflection mirrors in the direction perpendicular to the rotation axis in the reflection surface. The clamp is sandwiched between the pair of guide portions and the plate-shaped portion, and restricts movement in a direction parallel to the rotation axis.

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