Mirror surface angle adjustment device

Abstract

To provide a mirror surface angle adjustment device that can stably perform angle adjustment of a mirror surface of a mirror.SOLUTION: In a mirror angle adjustment device 1 configured to adjust a mirror angle using an actuator 20, the actuator 20 includes: pillow ball screws 50, 80 engageable with a mirror holder 12 so as to be able to transmit thrust force in an axial direction; worm wheels 40, 70 rotatably arranged together with the pillow ball screws; and motors 30, 60 configured to rotate the worm wheels 40, 70. The worm wheels 40, 70 have a triangular cross-sectional shape in a direction perpendicular to the axial direction and are provided with arrangement holes 42, 72 in which the pillow ball screws 50, 80 are movably arranged in the axial direction. The pillow ball screws 50, 80 have a triangular cross-sectional shape the same as the arrangement holes 42, 72 at an end on the opposite side of the engagement side with the mirror holder 12 and are provided with contact portions 53, 83 linearly contactable with inner surfaces of the arrangement holes 42, 72 when the worm wheels 40, 70 rotate.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a mirror surface angle adjusting device for adjusting the angle of a mirror surface such as a door mirror. [Background technology]

[0002] For example, a mirror angle adjusting device is provided on a door mirror of a vehicle to adjust the angle of the mirror surface by a motor. As this type of mirror angle adjusting device, Patent Document 1 discloses a mirror angle adjusting device that includes a male screw member, a nut member (adjuster), a gear member (worm wheel), and a motor.

[0003] In this mirror angle adjustment device, a groove is provided in the gear member and a protrusion is provided on the nut member, and the protrusion of the nut member is fitted into the groove of the gear member. As a result, the gear member is rotated by the rotation drive of the motor, and the rotating nut member is rotated via the protrusion of the nut member. When the rotating nut member rotates, the nut member that screws into the male thread member moves up and down, allowing the angle of the mirror surface to be adjusted. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6666772 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the above-mentioned mirror angle adjustment device, the rotational force of the gear member (worm wheel) is transmitted to the nut member (adjuster) via a small protrusion on the nut member. Therefore, when a large rotational force acts on the nut member from the gear member, the large force is concentrated at the base of the protrusion, which may damage the protrusion and prevent the rotational force of the gear member from being properly transmitted to the nut member. If the rotational force of the gear member cannot be properly transmitted to the nut member, the nut member will no longer move up and down stably, which will reduce the accuracy of adjusting the mirror's mirror angle.

[0006] Therefore, the present disclosure has been made to solve the above-mentioned problems, and aims to provide a mirror surface angle adjustment device that can adjust the angle of a mirror surface stably and accurately. [Means for solving the problem]

[0007] In order to solve the above problems, one aspect of the present disclosure is to a mirror holder for holding the mirror; an actuator that tilts the mirror holder to adjust the mirror angle of the mirror, The actuator is an adjuster that is provided so as to be movable in an axial direction by a screw mechanism and engages with the mirror holder so as to be able to transmit a thrust force in the axial direction; a worm wheel arranged coaxially with the adjuster and rotatable together with the adjuster; a motor having a worm attached to a rotary shaft, the worm meshing with a gear portion of the worm wheel; and the worm wheel has a polygonal cross section in a direction perpendicular to the axial direction, and includes an arrangement hole in which the adjuster is arranged so as to be movably mounted in the axial direction; The adjuster is characterized in that it has, at its end opposite to the side that engages with the mirror holder, a contact portion that has the same polygonal shape as the cross-sectional shape of the arrangement hole and that makes line contact with the inner surface of the arrangement hole when the worm wheel is rotated by the motor.

[0008] In this mirror angle adjustment device, when the motor is driven to rotate, the worm wheel rotates, and as the worm wheel rotates, the adjuster rotates as well. When the adjuster rotates, it moves axially via a screw mechanism, moving up and down (forward and backward). As the adjuster moves up and down, the mirror holder tilts, allowing the mirror angle to be adjusted.

[0009] The rotational force of the worm wheel is transmitted to the adjuster via the contact portion of the adjuster. Because the cross-sectional shape of the mounting hole in the worm wheel is polygonal and the contact portion of the adjuster has the same shape as the mounting hole of the worm wheel, the adjuster rotates with the worm wheel while the contact portion of the adjuster is in line contact with the inner surface of the mounting hole. Therefore, even if a large rotational force acts on the adjuster from the worm wheel, the large contact area and large moment of inertia cause the force to be dispersed and transmitted at the contact portion.

[0010] Therefore, the rotational force of the worm wheel can be transmitted to the adjuster with high accuracy and stability, which allows the adjuster to be raised and lowered accurately and smoothly, thereby enabling stable and accurate adjustment of the angle of the mirror surface.

[0011] The polygonal shape of the arrangement hole and the abutment portion may be a triangle, a rectangle, a pentagon, a hexagon, or the like, but a triangle is particularly preferable because it is the simplest shape and contributes to improving the production efficiency and reducing the production costs of the worm wheel and the adjuster.

[0012] In the above-mentioned mirror surface angle adjustment device, It is preferable that a retaining portion be provided at the end of the worm wheel on the mirror side, the retaining portion being formed so as to protrude into the arrangement hole.

[0013] By providing such a retaining portion on the end of the worm wheel on the mirror side, the contact portion of the adjuster hits the retaining portion, stopping the adjuster from moving up and down. In other words, the retaining portion functions as a stopper that forcibly stops the movement of the adjuster. Therefore, the retaining portion can prevent the adjuster from coming out (jumping out) of the arrangement hole of the worm wheel.

[0014] Furthermore, the retaining portion ensures that when the adjuster is placed in the worm wheel placement hole, it can only be inserted from the end opposite the retaining portion (one direction). This means that the adjuster can be prevented from being assembled backwards relative to the worm wheel. This prevents incorrect assembly of parts, improving production efficiency.

[0015] In any of the above mirror surface angle adjustment devices, It is preferable that a space be formed inside the gear portion of the worm wheel.

[0016] By forming a space (thinned portion) inside the gear portion of the worm wheel in this way, it is possible to prevent sink marks from occurring in the gear portion during molding of the worm wheel, thereby improving the product precision of the gear portion and improving the efficiency of transmission of driving force from the motor to the worm wheel.

[0017] Furthermore, by forming a space (a hollowed-out portion) inside the gear portion, the worm wheel can be made lighter. This allows the driving force of the motor that rotates the worm wheel to be reduced. This improvement in the transmission efficiency of the driving force and reduction in the driving force reduces the load on the motor. This prevents motor failure and extends the motor's lifespan, thereby improving the reliability of the mirror angle adjustment device.

[0018] In any of the above mirror surface angle adjustment devices, a base for accommodating the adjuster, the worm wheel, and the motor, and a cover; the cover has an opening in which the adjuster is movably disposed, It is preferable that a seal member be provided at the opening to keep the gap between the adjuster and the opening airtight.

[0019] In this mirror angle adjustment device, the movement of the adjuster is mechanically stopped by the worm wheel's retaining portion, so the adjuster does not hit the cover. Therefore, even if a seal member is provided at the opening of the cover, the adjuster will not hit the seal member and be crushed by the adjuster, resulting in deformation of the seal member. In other words, the seal member can maintain its flexibility, allowing it to stably maintain an airtight seal between the adjuster and the opening for a long period of time. This prevents water droplets and foreign matter from entering the actuator from the outside, preventing actuator failure and improving the reliability of the mirror angle adjustment device. [Effects of the Invention]

[0020] According to the present disclosure, it is possible to provide a mirror surface angle adjusting device that can stably and accurately adjust the angle of the mirror surface. [Brief explanation of the drawings]

[0021] [Figure 1]1 is an exploded perspective view showing a mirror angle adjustment device according to an embodiment. [Figure 2] FIG. 2 is a perspective view showing a worm wheel. [Figure 3] FIG. 2 is a perspective view showing a pillow ball screw. [Figure 4] 1 is a cross-sectional view showing a mirror angle adjustment device according to an embodiment. [Figure 5] FIG. 5 is an enlarged view of a V portion shown in FIG. [Figure 6] FIG. 10 is a diagram showing a state in which the mirror surface angle is tilted to the right. [Figure 7] FIG. 10 is a diagram showing a state in which the mirror surface angle is tilted to the left. DETAILED DESCRIPTION OF THE INVENTION

[0022] A mirror angle adjusting device for adjusting the mirror angle of a mirror, which is an embodiment according to the present disclosure, will be described in detail with reference to the drawings. In this embodiment, a case where the present disclosure is applied to a door mirror of a vehicle will be described. As shown in FIG. 1, the mirror angle adjusting device 1 in this embodiment includes a mirror 10, a mirror holder 12 that holds the mirror 10, and an actuator 20 that tilts the mirror holder 12. Note that the left and right and up and down in FIG. 1 refer to the left and right directions and up and down directions of the vehicle.

[0023] The actuator 20 includes a first motor 30, a first worm wheel 40, a first pillow ball screw 50 (adjuster), a second motor 60, a second worm wheel 70, and a second pillow ball screw 80 (adjuster). The first motor 30, the first worm wheel 40, and the first pillow ball screw 50 tilt the mirror holder 12 in the left-right direction, and the second motor 60, the second worm wheel 70, and the second pillow ball screw 80 tilt the mirror holder 12 in the up-down direction.

[0024] The first motor 30, first worm wheel 40, first pillow ball screw 50, second motor 60, second worm wheel 70, and second pillow ball screw 80 are housed inside a housing 90 formed by integrating a base 91 and a cover 92 made of synthetic resin (e.g., ABS resin, ASA resin, etc.). In this embodiment, the cover 92 and the base 91 are joined by snap fitting.

[0025] The first motor 30 and the second motor 60 are respectively housed in housing spaces 31, 61 formed in the base 91. A first worm 32 and a second worm 62 are respectively attached to the rotary shafts of the first motor 30 and the second motor 60.

[0026] The first worm 32 meshes with a gear portion (helical teeth) 41 of the first worm wheel 40, and the second worm 62 meshes with a gear portion (helical teeth) 71 of the second worm wheel 70. A space S (a hollowed-out portion) is formed inside these gear portions 41, 71 (see FIGS. 4 and 5). The first worm wheel 40 and the second worm wheel 70 are housed in a housing 90, rotatably sandwiched between a base 91 and a cover 92. As a result, the first worm wheel 40 and the second worm wheel 70 rotate when the first motor 30 and the second motor 60 are driven to rotate.

[0027] As shown in Fig. 2, the first worm wheel 40 and the second worm wheel 70 are formed with arrangement holes 42, 72, respectively, for axially movably arranging the first pillow ball screw 50 and the second pillow ball screw 80. The arrangement holes 42, 72 have a polygonal cross-sectional shape in a direction perpendicular to the axial direction. In this embodiment, the arrangement holes 42, 72 have a triangular cross-sectional shape. The first worm wheel 40 and the second worm wheel 70 are integrally molded products made of synthetic resin (e.g., PA resin, POM resin, etc.).

[0028] Since the first worm wheel 40 and the second worm wheel 70 have the same configuration, only the first worm wheel 40 is shown in the drawings, and only the reference numeral of the second worm wheel 70 is shown in parentheses. The same applies to the first pillow ball screw 50 and the second pillow ball screw 80.

[0029] The upper ends (ends on the cover 92 side) of the arrangement holes 42, 72 are formed with retaining portions 43, 73 that protrude inward toward the inside of the holes. In this embodiment, retaining portions are formed at three locations on the vertices of a triangle, but retaining portions can also be provided around the entire circumference of the triangle.

[0030] 4 and 5, the first pillow ball screw 50 and the second pillow ball screw 80, which are respectively disposed in the arrangement hole 42 of the first worm wheel 40 and the arrangement hole 72 of the second worm wheel 70, have openings at their lower ends (on the base 91 side) and are formed with insertion holes 51, 81 therein into which male threaded portions 93, 94 erected on the base 91 are inserted. In other words, the first pillow ball screw 50 and the second pillow ball screw 80 are disposed so as to coaxially cover the male threaded portions 93, 94.

[0031] As shown in Fig. 3, a plurality of feet 54, 84 are provided at equal intervals at the lower ends of the first pillow ball screw 50 and the second pillow ball screw 80. Pawl portions 55, 85 that screw into the male thread portions 93, 94 are formed on the inner surfaces of the tips of the feet 54, 84. The pawl portions 55, 85 of the feet 54, 84 screw into the male thread portions 93, 94, as shown in Figs. 4 and 5. In other words, the male thread portions 93, 94 and the pawl portions 55, 85 of the feet 54, 84 form a screw mechanism. As a result, when the first pillow ball screw 50 and the second pillow ball screw 80 rotate, they are caused to rise and fall (move axially) along the male thread portions 93, 94 by the screw mechanism.

[0032] 3 to 5, polygonal abutment portions 53, 83 having the same cross-sectional shape as the arrangement holes 42, 72 are formed near the bases of the feet 54, 84 of the first pillow ball screw 50 and the second pillow ball screw 80. In this embodiment, the abutment portions 53, 83 are also formed in a triangular shape (planar view) (see FIG. 3). When the worm wheels 40, 70 rotate, the outer circumferential surfaces of the abutment portions 53, 83 come into line contact with the inner surfaces of the arrangement holes 42, 72. As a result, rotational force is transmitted to the first pillow ball screw 50 and the second pillow ball screw 80 via the abutment portions 53, 83, causing the first worm wheel 40 and the second worm wheel 70 to rotate integrally with them.

[0033] 3 to 5, ball portions 52, 82 that engage (ball jointly connect) with the mirror holder 12 are formed on the upper ends (ends on the cover 92 side) of the first pillow ball screw 50 and the second pillow ball screw 80. As shown in FIG. 5, these ball portions 52, 82 protrude to the outside of the cover 92 from openings 95, 96 (see FIG. 1) that are formed at positions away from the center position of the cover 92 (the position where the boss portion 97 is disposed).

[0034] 1 and 5, a seal member 98 is provided in each of these openings 95, 96 to keep the gap between the first pillow ball screw 50 and the second pillow ball screw 80 and the openings 95, 96 airtight. The seal member 98 is a lip seal made of synthetic resin (for example, TPE resin, etc.), and is integrally molded with the cover 92.

[0035] 4 and 5, the ball portions 52, 82 are fitted into recesses 13, 14 formed in the mirror holder 12, respectively. As a result, the first pillow ball screw 50 and the second pillow ball screw 80 are engaged with the mirror holder 12 so as to be able to transmit a thrust force in the axial direction. In other words, the mirror holder 12 is tilted by the first pillow ball screw 50 and the second pillow ball screw 80 moving up and down. The first pillow ball screw 50 and the second pillow ball screw 80 are integrally molded products made of synthetic resin (for example, PA resin, POM resin, etc.).

[0036] 4, the mirror holder 12 is also held in a tiltable manner relative to the cover 92 (housing 90). That is, a boss 97 that protrudes from the outer surface of the cover 92 is formed in the center of the cover 92. This boss 97 is fitted into a recess 15 formed in the center of the rear surface (backside) of the mirror holder 12 and connected by a ball joint. This allows the mirror holder 12 to be held in a tiltable manner in the left-right and up-down directions relative to the cover 92 (housing 90).

[0037] Anti-rotation protrusions 99 are provided at equal intervals around the boss portion 97 of the cover 92, and anti-rotation holes 19 into which the anti-rotation protrusions 99 of the cover 92 engage are formed around the recessed portion 15 of the mirror holder 12. As a result, when the boss portion 97 of the cover 92 is fitted into the recessed portion 15 of the mirror holder 12, the anti-rotation protrusions 99 of the cover 92 engage with the anti-rotation holes 19 of the mirror holder 12, preventing the mirror holder 12 from rotating around the axis AX of the boss portion 97 relative to the cover 92 (housing 90).

[0038] Next, the operation of the mirror angle adjustment device 1 having the above configuration will be described with reference to Figures 4, 6, and 7. Note that the operation of tilting the mirror holder 12 by the actuator 20 is basically the same in the left-right direction and the up-down direction of the vehicle, so in the following explanation, the tilting operation in the left-right direction will be illustrated and explained, and the explanation of the tilting operation in the up-down direction will be omitted.

[0039] First, the state shown in Figure 4 is a state in which the mirror surface angle of the mirror 10 is in a neutral position. The neutral state is a state in which the central axis of the boss portion 97 is perpendicular to the mirror surface of the mirror 10. When the first motor 30 is driven from this neutral state to rotate the first worm 32, the first worm wheel 40 having the gear portion 41 meshing with the first worm 32 rotates. At this time, the first worm wheel 40 is sandwiched between the base 91 and the cover 92, and therefore is prevented from moving in the axial direction.

[0040] When the first worm wheel 40 rotates, the first pillow ball screw 50 rotates together with the first pillow ball screw 50, raising and lowering the male thread portion 93. As the first pillow ball screw 50 rises and falls, the mirror holder 12 tilts, and the mirror surface angle of the mirror 10 is adjusted in the left-right direction.

[0041] Specifically, the motor 30 is driven from the neutral state to rotate the first worm wheel 40, and as shown in Fig. 6, the first pillow ball screw 50 is lowered, thereby tilting the mirror holder 12 to the right (clockwise in the figure, when the mirror 10 moves from the state indicated by the two-dot chain line to the state indicated by the solid line). On the other hand, the motor 30 is driven from the neutral state to rotate the first worm wheel 40 in the reverse direction to lift the first pillow ball screw 50, as shown in Fig. 7, thereby tilting the mirror holder 12 to the left (counterclockwise in the figure, when the mirror 10 moves from the state indicated by the two-dot chain line to the state indicated by the solid line).

[0042] The mirror holder 12 can be tilted up and down by performing the same operation on the second worm wheel 70 and the second pillow ball screw 80. In this way, in the mirror angle adjustment device 1, the mirror holder 12 is tilted left and right and up and down to adjust the mirror angle of the mirror 10.

[0043] Here, in the mirror angle adjustment device 1 of this embodiment, the cross-sectional shape of the arrangement holes 42, 72 in the worm wheels 40, 70 is triangular, and the abutment portions 53, 83 of the pillow ball screws 50, 80 have the same shape (i.e., triangular) as the arrangement holes 42, 72 of the worm wheels 40, 70. As a result, the pillow ball screws 50, 80 rotate together with the worm wheels 40, 70 with the abutment portions 53, 83 of the pillow ball screws 50, 80 in line contact with the inner surfaces of the arrangement holes 42, 72.

[0044] Therefore, even if a large rotational force acts on the ball screw 50, 80 from the worm wheel 40, 70, the force is not concentrated in a specific location but is dispersed and transmitted at the line-contacting abutment portions 53, 83. Furthermore, even if a portion of the abutment portion 53, 83 is damaged, the rotational force can be reliably transmitted from the worm wheel 40, 70 to the ball screw 50, 80 via the abutment portion 53, 83.

[0045] Therefore, the rotational force of the worm wheels 40, 70 can be transmitted accurately and stably to the ball screws 50, 80. This allows the ball screws 50, 80 to be raised and lowered accurately and smoothly, thereby enabling stable and accurate adjustment of the mirror surface angle of the mirror 10 in the left-right and up-down directions.

[0046] Furthermore, since the shapes of the arrangement holes 42, 72 and the abutment portions 53, 83 are triangles, the simplest of polygons, the production efficiency of the worm wheels 40, 70 and the pillow ball screws 50, 80 can be improved and production costs can be reduced, which contributes to cost reduction of the mirror angle adjustment device 1 and makes production management easier.

[0047] Furthermore, in the mirror angle adjustment device 1 of this embodiment, the upper end of the worm wheel 40, 70 is provided with a retaining portion 43, 73 formed to protrude inward into the arrangement hole 42, 72. When the ball bearing screw 50, 80 rises to the maximum stroke amount, the abutment portion 53, 83 of the ball bearing screw 50, 80 abuts against the retaining portion 43, 73, thereby stopping the rise of the ball bearing screw 50, 80 (see FIG. 7 ). In other words, the retaining portion 43, 73 functions as a mechanical stopper that forcibly stops the movement of the ball bearing screw 50, 80. Therefore, the retaining portion 43, 73 can prevent the ball bearing screw 50, 80 from coming out (jumping out) of the arrangement hole 42, 72 of the worm wheel 40, 70.

[0048] In this way, in the mirror surface angle adjustment device 1, the upward movement of the ball-locked screws 50, 80 is mechanically stopped by the retaining portions 43, 73 of the worm wheels 40, 70 (the upper surfaces of the abutment portions 53, 83 abut against the lower surfaces of the retaining portions 43, 73), so the ball-locked screws 50, 80 do not come into contact with the cover 92. Therefore, even if seal members 98, 98 are provided in the openings 95, 96 of the cover 92, the ball-locked screws 50, 80 will not come into contact with the seal members 98, 98 and be crushed by the ball-locked screws 50, 80, resulting in deformation of the seal members 98, 98.

[0049] In other words, the sealing performance of the sealing members 98, 98 provided in the openings 95, 96 can be maintained, so that the sealing members 98, 98 can closely follow the movement of the ball-lock screws 50, 80 as they move up and down, stably maintaining an airtight seal between the ball-lock screws 50, 80 and the openings 95, 96 for a long period of time. This prevents water droplets and foreign matter from entering the housing 90 from the outside, thereby preventing malfunction of the actuator 20 and improving the reliability of the mirror angle adjustment device 1.

[0050] Furthermore, when placing the ball screws 50, 80 in the placement holes 42, 72 of the worm wheels 40, 70, the retaining portions 43, 73 allow them to be inserted only from the end (one direction) opposite the retaining portions 43, 73. In other words, it is possible to prevent the ball screws 50, 80 from being reverse-assembled to the worm wheels 40, 70. This makes it possible to prevent incorrect assembly of parts, thereby improving the production efficiency of the mirror angle adjustment device 1.

[0051] Furthermore, in the mirror angle adjusting device 1 of this embodiment, a space S (a hollowed-out portion) is formed inside the gear portion 41, 71 of the worm wheel 40, 70. This makes it possible to prevent sink marks from occurring in the gear portion 41, 71 when the worm wheel 40, 70 is molded. This improves the product precision of the gear portion 41, 71. Therefore, the efficiency of transmission of the driving force from the motor 30, 60 to the worm wheel 40, 70 is improved.

[0052] Furthermore, by forming the space S inside the gear portions 41, 71, the weight of the worm wheels 40, 70 can be reduced, and therefore the driving force of the motors 30, 60 that rotate the worm wheels 40, 70 can be reduced.

[0053] In this way, it is possible to improve the efficiency of transmission of the driving force from the motors 30, 60 to the worm wheels 40, 70 and reduce the driving force in the motors 30, 60, thereby reducing the load on the motors 30, 60. Therefore, it is possible to prevent breakdowns in the motors 30, 60 and extend the life of the motors 30, 60, thereby improving the reliability of the mirror angle adjustment device 1.

[0054] As described above, according to the mirror surface angle adjustment device 1 of this embodiment, the cross-sectional shape of the mounting holes 42, 72 in the worm wheels 40, 70 is triangular, and the abutment portions 53, 83 of the ball-bearing screws 50, 80 have the same shape (i.e., triangular) as the mounting holes 42, 72 of the worm wheels 40, 70. Therefore, the rotational force of the worm wheels 40, 70 can be transmitted to the ball-bearing screws 50, 80 via the abutment portions 53, 83 that are in line contact with the inner surfaces of the mounting holes 42, 72. This allows the rotational force of the worm wheels 40, 70 to be transmitted to the ball-bearing screws 50, 80 with high precision and stability, enabling the ball-bearing screws 50, 80 to be raised and lowered accurately and smoothly. Therefore, the mirror surface angle of the mirror 10 can be adjusted stably and accurately in the left-right and up-down directions.

[0055] The above-described embodiments are merely illustrative and do not limit the present disclosure in any way. Needless to say, various improvements and modifications are possible within the spirit and scope of the present disclosure. For example, in the above-described embodiments, the arrangement holes 42, 72 of the first worm wheel 40 and the second worm wheel 70 and the contact portions 53, 83 of the first pillow ball screw 50 and the second pillow ball screw 80 are triangular in shape. However, these shapes are not limited to triangles and may be polygonal, such as square, pentagonal, or hexagonal. This is because such polygonal shapes allow the side surfaces of the contact portions 53, 83 to be in line contact with the inner surfaces of the arrangement holes 42, 72 when the first worm wheel 40 or the second worm wheel 70 rotates integrally with the first pillow ball screw 50 or the second pillow ball screw 80.

[0056] Furthermore, in the above embodiment, the case where the present disclosure is applied to a door mirror of a vehicle is exemplified, but the present disclosure can also be applied to mirrors other than door mirrors. [Explanation of symbols]

[0057] 1 Mirror angle adjustment device 10. Mirror 12 Mirror holder 20 Actuator 30 First motor 32 First Worm 40 No. 1 worm wheel 41 Gear section 42 Placement hole 43 Retaining part 50 First Pillow Ball Screw 53 Contact part 54 Foot 55 Claw 60 Second motor 62 2nd Worm 70 Second worm wheel 71 Gear section 72 Placement hole 73 Retaining part 80 Second Pillow Ball Screw 83 Contact part 84 Foot 85 Claw 91 Base 92 Cover 93 Male thread 94 Male thread 95 Opening 96 Opening 98 Sealing material S space

Claims

1. a mirror holder for holding the mirror; an actuator that tilts the mirror holder to adjust the mirror angle of the mirror, The actuator is an adjuster that is provided so as to be movable in an axial direction by a screw mechanism and engages with the mirror holder so as to be able to transmit a thrust force in the axial direction; a worm wheel arranged coaxially with the adjuster and rotatable together with the adjuster; a motor having a worm attached to a rotary shaft, the worm meshing with a gear portion of the worm wheel; and the worm wheel has a polygonal cross section in a direction perpendicular to the axial direction, and includes an arrangement hole in which the adjuster is arranged so as to be movably mounted in the axial direction; The adjuster has, at an end opposite to the side engaging with the mirror holder, a contact portion that has a polygonal shape identical to the cross-sectional shape of the arrangement hole and that comes into line contact with the inner surface of the arrangement hole when the worm wheel is rotated by the motor. A mirror angle adjustment device characterized by:

2. 2. The mirror angle adjustment device according to claim 1, The worm wheel has an end portion on the mirror side that is provided with a retaining portion formed to protrude into the arrangement hole. A mirror angle adjustment device characterized by:

3. 3. The mirror angle adjustment device according to claim 1 or 2, A space is formed inside the gear portion of the worm wheel. A mirror angle adjustment device characterized by:

4. 3. The mirror angle adjustment device according to claim 1 or 2, a base for accommodating the adjuster, the worm wheel, and the motor, and a cover; the cover has an opening in which the adjuster is movably disposed, The opening is provided with a seal member that keeps the gap between the adjuster and the opening airtight. A mirror angle adjustment device characterized by:

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