Rotation adjustment mechanism and headlamp device

Abstract

The rotation adjustment mechanism includes: a rotation object module (101) that is supported so as to be rotatable about a first rotation axis (15); and an adjustment unit (301) that includes a slider (32) that is movable along a slide axis (34) in a direction perpendicular to the first rotation axis. The adjustment unit (301) is supported so as to be rotatable about a second rotation axis (35). The rotation object module (101) has a coupling groove (14a), and the slider has a protrusion (33) and slide members (32b, 32c), and the protrusion is fitted into the coupling groove. The fixing member has cam grooves (25a, 25b) that engage with the slide members, and the rotation of the adjustment unit about the second rotation axis is defined by translational positions in two directions (Y, Z) that are perpendicular to the second rotation axis and perpendicular to each other. The groove shape of the cam groove is an arc shape that keeps the rotation angle of the contact point where the coupling groove and the protrusion contact, corresponding to the unit movement amount of the slider in the direction parallel to the slide axis, fixed about the first rotation axis.

Description

Technical Field

[0001] The present invention relates to a rotation adjustment mechanism and a headlamp device having the rotation adjustment mechanism. Background Art

[0002] In a headlamp device, there is an optical axis adjustment mechanism that pivotally (rotationally) supports, vertically translates, and horizontally translates an optical module, which is a rotation target module, at three points of constraint, and adjusts the linear momentum in each support to adjust the orientation of the optical axis of the optical module in the vertical direction and the horizontal direction. For example, Patent Document 1 describes the following configuration: A bracket that constrains the optical module is held in a housing at three points: a spherical joint, a set of an alignment screw and an alignment nut, and another set of an alignment screw and an alignment nut. The optical module is constrained by a connecting portion at a fulcrum so as to be rotatable relative to the bracket about an axis in the vertical direction. For the optical module, the orientation of the optical axis of the optical module in the vertical direction is adjusted by the linear motion of the motor shaft of a motor connected to its lower end. In addition, for the bracket, the orientation of the optical axis of the optical module in the horizontal direction (i.e., the inclination in the horizontal direction) can be manually adjusted using each set of the alignment screw and the alignment nut.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Patent No. 5700818 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] However, in a method of adjusting the orientation of an optical module using a linear motion mechanism of an adjustment unit placed at a position away from the rotation support portion of the optical module, there is a problem that the rotation angle of the optical module to which the rotational force is transmitted is not in a linear (i.e., fixed) relationship with the unit movement amount of the linear motion mechanism (for example, the movement amount of one step of a stepping motor), and thus the orientation (i.e., the rotation angle) of the optical module cannot be adjusted with high resolution.

[0008] The present invention has been made to solve the above problems, and an object thereof is to provide a rotation adjustment mechanism and a headlamp device in which the rotation angle of a rotation target module has a linear relationship with the unit movement amount of a slider of an adjustment unit, and thus the orientation of the rotation target module can be adjusted with high resolution.

[0009] Means for Solving the Problems

[0010] The rotation adjustment mechanism of the present invention includes: a rotation object module that is supported by a fixed member so as to be rotatable about a first rotation axis; and an adjustment unit that is supported by the fixed member and includes a slider that can move along a slide axis in a direction perpendicular to the first rotation axis. The adjustment unit is supported so as to be rotatable about a second rotation axis, the second rotation axis is parallel to the first rotation axis and is provided on the fixed member. The rotation object module has a coupling groove, the slider has a protrusion and a sliding member, the protrusion is engaged with the coupling groove, the sliding member contacts the fixed member at a position other than the second rotation axis, the fixed member has a cam member that engages with the sliding member, and the rotation of the adjustment unit about the second rotation axis is defined by translational positions in two directions perpendicular to the second rotation axis and perpendicular to each other. The cam member has a guiding surface with an arc shape, and the guiding surface with the arc shape keeps the rotation angle of the contact point where the coupling groove contacts the protrusion about the first rotation axis corresponding to the unit movement amount of the slider in a direction parallel to the slide axis fixed.

[0011] Advantages of the Invention

[0012] According to the present invention, the rotation angle of the rotation object module has a linear relationship with the unit movement amount of the slider of the adjustment unit, so that the orientation of the rotation object module can be adjusted with a high resolution. Description of the Drawings

[0013] Figure 1 It is a side view schematically showing the structure of the headlamp device of Embodiment 1.

[0014] Figure 2 It is a perspective view schematically showing the structure of the headlamp device of Embodiment 1.

[0015] Figure 3 It is an exploded perspective view schematically showing the structure of the headlamp device of Embodiment 1.

[0016] Figure 4 It is a side view (Part 1) showing the operation of the headlamp device of Embodiment 1.

[0017] Figure 5 It is a side view (Part 2) showing the operation of the headlamp device of Embodiment 1.

[0018] Figure 6 It is a schematic diagram showing the relationship between the rotation of the optical module and the rotation of the adjustment unit of the headlamp device of Embodiment 1.

[0019] Figure 7 It is a side view schematically showing the structure of the headlamp device of Embodiment 2.

[0020] Figure 8 is an exploded perspective view schematically showing the structure of the headlight device according to Embodiment 2.

[0021] Figure 9 is a side view schematically showing the structure of the headlight device according to Embodiment 3.

[0022] Figure 10 is a perspective view schematically showing the structure of the headlight device according to Embodiment 3.

[0023] Figure 11 is an exploded perspective view schematically showing the structure of the headlight device according to Embodiment 3.

[0024] Figure 12 is a schematic diagram showing the relationship between the rotation of the optical module and the rotation of the adjustment unit of the headlight device according to Embodiment 3.

[0025] Figure 13 is a perspective view showing another supporting method of the first rotation axis of the headlight device according to Embodiment 3.

[0026] Figure 14 is a side view schematically showing the structure of the headlight device according to Embodiment 4.

[0027] Figure 15 is a perspective view schematically showing the structure of the headlight device according to Embodiment 4.

[0028] Figure 16 is an exploded perspective view schematically showing the structure of the headlight device according to Embodiment 4.

[0029] Figure 17 is a schematic diagram showing the relationship between the rotation of the optical module and the adjustment unit of the headlight device according to Embodiment 4.

[0030] Figure 18 is a side view schematically showing the structure of the headlight device according to Embodiment 5.

[0031] Figure 19 is an exploded perspective view schematically showing the structure of the headlight device according to Embodiment 5. Detailed Embodiments

[0032] Hereinafter, the rotation adjustment mechanism and the headlight device according to the embodiments will be described with reference to the drawings. The following embodiments are merely examples, and the embodiments can be appropriately combined and each embodiment can be appropriately changed. In the drawings, the same reference numerals are given to the same structures.

[0033] The axes of the XYZ orthogonal coordinate system are shown in the figure. The front of the headlamp device equipped with the rotation adjustment mechanism is taken as the +Z axis direction, and the rear is taken as the -Z axis direction. The front of the headlamp device is the direction in which the illumination light is emitted. The upper side of the headlamp device shown in the figure is taken as the +Y axis direction, and the lower side is taken as the -Y axis direction. In the state facing the front (+Z axis direction) of the headlamp device, the left side of the headlamp device is taken as the +X axis direction, and the right side of the headlamp device is taken as the -X axis direction. In the following embodiments, for example, the light emitted from the light source unit is emitted in the +Z axis direction.

[0034] The optical axis adjustment of the headlamp device around the X axis means adjusting the direction of the optical axis of the headlamp device between the obliquely upward direction and the obliquely downward direction. The optical axis adjustment of the headlamp device around the X axis is mainly used for correcting the installation offset of the headlamp device relative to the vehicle body and the optical axis offset caused by the inclination of the vehicle body during driving.

[0035] When the optical module of the headlamp device is installed obliquely around the X axis with respect to the vehicle body, there is a problem that the optimal light distribution of the headlamp device cannot be obtained. In addition, in this case, problems such as dazzling the driver of the oncoming vehicle due to the light emitted from the optical module sometimes occur. "Dazzling" means disturbing a person's line of sight. "Dazzling" means that the light emitted from the optical module of the headlamp device of one's own vehicle enters the eyes of the driver of the oncoming vehicle and hinders the driving of the driver of the oncoming vehicle. Therefore, an adjustment unit is used to perform optical axis adjustment to correct the inclination of the optical axis of the optical module around the X axis with respect to the vehicle body.

[0036] On the other hand, when a person is sitting in the rear seat of the vehicle, the vehicle body tilts backward. In addition, when goods or the like are loaded on the rear seat or the rear trunk, the vehicle body also tilts backward. In addition, when the vehicle is accelerating, the vehicle body tilts backward, and when the vehicle is decelerating, the vehicle body tilts forward. Here, "tilting" means that the vehicle body rotates around the axis of the vehicle's wheels and tilts. In this case, an adjustment unit is also used to adjust the inclination of the optical axis of the optical module around the X axis (i.e., optical axis adjustment). The control circuit (not shown) of the control unit that controls the operation of the rotation adjustment mechanism is installed on the vehicle body, for example, and can automatically perform optical axis adjustment of the optical module by the adjustment unit according to the detection result of the inclination sensor that detects the inclination of the vehicle body. In addition, the adjustment unit can perform optical axis adjustment of the optical module according to the operation of a user operation unit such as a switch that controls the operation of the rotation adjustment mechanism.

[0037] 《Embodiment 1》

[0038] Figure 1 It is a side view schematically showing the structure of the headlamp device 1000 of Embodiment 1. Figure 2It is a perspective view schematically showing the structure of the headlight device 1000. Figure 3 It is an exploded perspective view schematically showing the structure of the headlight device 1000. The headlight device 1000 includes an optical module 101 as a rotation object module, a fixed member 201, and an adjustment unit 301. The headlight device 1000 has a rotation adjustment mechanism. The rotation adjustment mechanism includes: an optical module 101 rotatably mounted on the fixed member 201 about the X axis; and an adjustment unit 301 rotatably mounted on the fixed member 201 about the X axis, connected to the optical module 101, and causing the optical module 101 to rotate about the X axis.

[0039] The optical module 101 has, for example, a light source unit 11, an optical component 12, a holding member 13, and a connecting member 14. The light source unit 11, the optical component 12, and the connecting member 14 are mounted on the holding member 13. However, the structure of the optical module 101 is not limited to the structure shown in the figure.

[0040] The light source unit 11 emits light. The light source unit 11 has, for example, a solid light source. The light source unit 11 is held by the holding member 13. The optical component 12 transmits and reflects the light emitted from the light source unit 11 and projects it forward (substantially in the +Z axis direction). The optical component 12 has, for example, a projection lens. The optical axis of the optical component 12 is denoted as the optical axis A.

[0041] The holding member 13 can support the light source unit 11 and the optical component 12. The holding member 13 has, for example, the function of a radiator. By using the holding member 13, the heat generated in the light source unit 11 can be effectively diffused, and the excessive temperature rise of the light source unit 11 can be suppressed.

[0042] The holding member 13 has first rotation shaft pins 15a and 15b at the end faces in its left - right direction (±X axis direction), and the first rotation shaft pins 15a and 15b constitute the first rotation shaft 15. The first rotation shaft pin 15b (not shown) protruding in the -X axis direction is coaxial with the first rotation shaft pin 15a protruding in the +X axis direction. That is, the coaxial first rotation shaft pins 15a and 15b protrude in opposite directions.

[0043] The holding member 13 has a connecting member 14 on the rear side in its front-rear direction (±Z-axis direction). A linear engaging groove 14a is provided in the connecting member 14, and the linear engaging groove 14a extends linearly. The linear engaging groove 14a in this example is a linear groove extending in a direction perpendicular to the first rotation axis 15 (for example, the ±Z-axis direction). More specifically, the linear engaging groove 14a is a linear groove extending in a direction perpendicular to the first rotation axis 15 and parallel to a straight line connecting the first rotation axis 15 and a point on the locus of a protrusion 33 described later. The linear engaging groove 14a can be, for example, a linear groove extending in a direction perpendicular to the first rotation axis 15 and parallel to the straight line connecting the first rotation axis 15 and the protrusion 33 in a state where the optical module 101 is connected to the adjustment unit 301.

[0044] As Figure 3 shown, the adjustment unit 301 has, for example, a bracket 37, a feed screw 31, a motor 38, and a slider 32. The feed screw 31, the slider 32, and the motor 38 constitute a linear feed mechanism for linearly feeding the slider 32 along the feed screw 31.

[0045] The feed screw 31 is supported by the bracket 37 so as to be rotatable about the Y-axis. The rotational output shaft of the motor 38 is connected to the feed screw 31 to transmit its rotational driving force to the feed screw 31. The main body of the motor 38 is fixed to the bracket 37. A threaded portion 32a (i.e., a threaded hole) is provided at the central portion of the slider 32, and the threaded portion 32a engages with the feed screw 31 in such a manner that the slider 32 can translate in the ±Y-axis direction with respect to the rotation of the feed screw 31 about the Y-axis.

[0046] The slider 32 has sliding pins 32b and 32c as sliding members on the end faces in its left-right direction (±X-axis direction), and the sliding pins 32b and 32c engage (contact) with cam grooves 25a and 25b as cam members described later. The sliding pin 32b is provided on the +X-axis side of the slider 32 and is a pin having an axis parallel to the X-axis. A sliding pin 32c coaxial with the sliding pin 32b is provided on the -X-axis side of the slider 32. A protrusion 33 with a spherical end is integrally formed on the slider 32. The protrusion 33 engages with the linear engaging groove 14a provided in the connecting member 14 of the optical module 101.

[0047] The bracket 37 is mounted so as to be rotatable about a second rotation axis 35 (described later) with respect to the fixed member 201 Figure 6As shown in the figure, it can rotate freely. In this example, the bracket 37 has second rotary shaft pins 35a and 35b on the end faces in its left - right direction (±X - axis direction), and the second rotary shaft pins 35a and 35b constitute the second rotary shaft 35. The second rotary shaft pin 35a is provided on the +X - axis side of the bracket 37 and is a pin having an axis parallel to the X - axis. On the -X - axis side of the bracket 37, there is a second rotary shaft pin 35b coaxial with the second rotary shaft pin 35a.

[0048] As Figure 3 shown, the fixing member 201 includes, for example, first rotary bearings 21a and 21b, second rotary bearings 23a and 23b (23b is not shown), and cam grooves 25a and 25b which are cam members for regulating the operation of the regulating unit 301. In addition, in Figure 1 and Figure 2 only a part of the fixing member 201 is shown.

[0049] The first rotary bearing 21a is provided on the +X - axis side of the fixing member 201 and is a shaft hole parallel to the X - axis. The first rotary bearing 21b is provided on the -X - axis side of the fixing member 201 and is a shaft hole coaxial with the first rotary bearing 21a. The first rotary bearings 21a and 21b respectively axially support the first rotary shaft pins 15a and 15b which are provided on the holding member 13. Thus, the optical module 101 is supported relative to the fixing member 201 so as to be rotatable freely about the X - axis.

[0050] The second rotary bearing 23a is provided on the +X - axis side of the fixing member 201 and is a shaft hole parallel to the X - axis. On the -X - axis side of the fixing member 201, there is a second rotary bearing 23b coaxial with the second rotary bearing 23a. The second rotary bearings 23a and 23b respectively axially support the second rotary shaft pins 35a and 35b which are provided on the regulating unit 301 (more specifically, the bracket 37 included in the regulating unit 301). Thus, the regulating unit 301 is supported relative to the fixing member 201 so as to be rotatable freely about the X - axis with the second rotary shaft 35 (described later in Figure 6 shown.) which is at a position different from the first rotary shaft 15 (described later in Figure 6 shown.) as the rotation center.

[0051] The cam groove 25a is provided on the +X - axis side of the fixing member 201, and the cam groove 25b is provided on the -X - axis side of the fixing member 201. The cam grooves 25a and 25b face each other. The cam grooves 25a and 25b are respectively engaged with sliding pins 32b and 32c which are provided on the regulating unit 301.

[0052] Figure 4 and Figure 5It is a side view (Part 1 and Part 2) showing the operation of the headlight device 1000. In addition, in Figure 4 and Figure 5 , only a part of the fixing member 201 is shown. In Figure 1 , when the feed screw 31 is rotated about the Y-axis by driving the motor 38, for example, when the slider 32 moves in the +Y-axis direction or the -Y-axis direction, the slide pins 32b, 32c fixed to the slider 32 engage with the cam grooves 25a, 25b provided in the fixing member 201 and move in the substantially +Y-axis direction as upward or the -Y-axis direction as downward. By this operation, as Figure 4 shows, the adjustment unit 301 rotates about the X-axis (i.e., counterclockwise or clockwise) with the second rotation axis 35 as the rotation center.

[0053] When the cam grooves 25a, 25b are of the Figure 1 shown shape, when the slider 32 moves in the substantially +Y-axis direction as upward, as Figure 4 shows, the adjustment unit 301 rotates about the X-axis (i.e., counterclockwise) with the second rotation axis 35 as the center. At this time, as Figure 4 shows, the optical axis A of the optical module 101 inclines obliquely downward with the +Z-axis direction as the reference.

[0054] In addition, when the cam grooves 25a, 25b are of the Figure 1 shown shape, when the slider 32 moves in the substantially -Y-axis direction as downward, as Figure 5 shows, the adjustment unit 301 rotates about the X-axis (i.e., clockwise) with the second rotation axis 35 as the center. At this time, as Figure 5 shows, the optical axis A of the optical module 101 inclines obliquely upward with the +Z-axis direction as the reference.

[0055] Similarly, when the feed screw 31 is rotated about the Y-axis by driving the motor 38, when the slider 32 moves in the substantially +Y-axis direction (or the substantially -Y-axis direction), the protrusion 33 fixed to the slider 32 engages with the linear engagement groove 14a provided in the connecting member 14 and moves in the substantially +Y-axis direction as upward (or the substantially -Y-axis direction as downward). By this operation, the optical module 101 rotates about the X-axis with the first rotation axis 15 (more specifically, the rotation axis defined by the first rotation axis pins 15a, 15b) as the rotation center. In this example, the contact point where the linear engagement groove 14a contacts the protrusion 33 rotates about the first rotation axis 15.

[0056] For example, when the slider 32 moves in the substantially +Y-axis direction as upward, as Figure 4 shows, the optical module 101 rotates about the X-axis with the first rotation axis 15 as the center (i.e., inFigure 4 In addition, for example, when the slide member 32 moves in the substantially -Y-axis direction as the lower side, as shown in FIG. Figure 5 As shown, the optical module 101 rotates around the X-axis (i.e., Figure 5 Rotates clockwise).

[0057] The tilt amount (i.e., the rotation angle) of the optical module 101 around the X-axis with the first rotation axis 15 as the center is determined by the ball center of the protrusion 33 provided on the slider 32 (e.g., Figure 6 The Y-coordinate position and Z-coordinate position of the ball center of the protrusion 33 are determined by the Y-coordinate position and Z-coordinate position of the position 33b, 33c, 33d, and 33e in the projection 33. In addition, the Y-coordinate position and Z-coordinate position of the ball center of the protrusion 33 are determined by the translation movement of the slider 32 in the Y-axis direction and the tilting amount of the adjustment unit 301 around the X-axis with the second rotation axis 35 as the center at this time. Here, the rotation of the adjustment unit 301 around the X-axis with the second rotation axis 35 as the center is determined by the cam grooves 25a and 25b, and the cam grooves 25a and 25b are determined by the translation position of the adjustment unit 301 in two directions (in this example, the Y-axis direction and the Z-axis direction) that are perpendicular to the second rotation axis 35 and perpendicular to each other. Therefore, the tilting amount of the adjustment unit 301 around the X-axis with the second rotation axis 35 as the center is determined by the cam action of the sliding pins 32b and 32c fixed to the slider 32 moving along the cam grooves 25a and 25b provided on the fixed component 201. That is, the tilt amount of the adjustment unit 301 around the X-axis with the second rotation axis 35 as the center corresponding to the translational movement amount of the slider 32 in the Y-axis direction can be arbitrarily set by adjusting the cam shapes of the cam grooves 25a and 25b.

[0058] Figure 6It is a schematic diagram showing the relationship between the rotation of the optical module 101 of the headlamp device 1000 and the rotation of the adjustment unit 301. When the tilt amount of the optical module 101 about the X-axis with respect to the first rotation axis 15 is fixed with respect to the fixed translational movement amount of the slider 32 in the direction of the sliding axis 34 (i.e., the substantially Y-axis direction) (i.e., when the translational movement amount and the tilt amount are in a linear relationship), the groove shapes of the cam grooves 25a and 25b can also be set to an arc shape that keeps the angular movement amount (i.e., the rotation angle) of the contact point where the linear coupling groove 14a contacts the protrusion 33 corresponding to the unit movement amount of the slider 32 in the direction of the sliding axis 34 about the first rotation axis 15 fixed. In addition, the cam grooves 25a and 25b as cam members can have a guiding surface in an arc shape, and the guiding surface in the arc shape defines the rotation of the adjustment unit 301 about the second rotation axis using the translational positions in two directions (Y, Z) that are perpendicular to the second rotation axis and perpendicular to each other. In the case of this example, the inner peripheral surface and the outer peripheral surface in an arc shape of the cam grooves 25a and 25b correspond to the guiding surface. Hereinafter, in other embodiments, the description related to the groove shape of the cam groove can also be interpreted as the description of the shape of the guiding surface of the cam member. For example, as Figure 6 shown, the groove shapes of the cam grooves 25a and 25b are formed such that the spherical center of the protrusion 33 moves to positions 33a, 33b, 33c, 33d, and 33e.

[0059] Figure 6 It shows the mutual positional relationship of the first rotation axis 15, the second rotation axis 35, the sliding axis 34, and the spherical center of the protrusion 33 of the headlamp device 1000, and the relationship between the angle θ0 as the rotation angle of the optical module 101 and the angles α and β as the rotation angles of the adjustment unit 301. Here, the slope of the optical module 101 is represented by the line segment connecting the first rotation axis 15 and the spherical center of the protrusion 33, and the slope of the adjustment unit 301 is represented by the line segment connecting the second rotation axis 35 and the spherical center of the protrusion 33.

[0060] In Figure 6 when the spherical center of the protrusion 33 is located at position 33a, the slope of the optical module 101 is 0 (horizontal), and the slope of the slope of the adjustment unit 301 (i.e., the slope of the sliding axis 34) is also 0 (vertical). The sliding axis 34 at this time is denoted as the sliding axis 34a.

[0061] Next, in order to tilt the optical module 101 by a fixed angle θ0 when the slider 32 ( Figure 6 not shown in.) moves a unit movement amount L in the +Y-axis direction along the sliding axis 34a, the sliding axis 34a can be tilted by an angle α to the sliding axis 34b, and the spherical center of the protrusion 33 can be moved from position 33b to position 33d. In addition, in order to when the slider 32 ( Figure 6(Not shown in the figure.) When the optical module 101 is moved by a movement amount of 2L (i.e., twice the unit movement amount L) in the +Y-axis direction along the sliding shaft 34a from the initial position, the optical module 101 is tilted by an angle of 2θ0 (i.e., twice the fixed angle θ0), and the sliding shaft 34a can be tilted by an angle β to the sliding shaft 34c, so that the spherical center of the protrusion 33 moves from the position 33c to the position 33e. That is, if the groove shapes of the cam grooves 25a and 25b are configured such that the spherical center of the protrusion 33 passes along a trajectory formed by smoothly connecting the positions 33a, 33d, and 33e, the tilt amount of the optical module 101 about the X-axis with respect to the first rotation axis 15 can be fixed relative to the fixed translational movement amount of the slider 32 in the direction of the sliding shaft 34 (i.e., the substantially ±Y-axis direction). That is, the translational movement amount of the slider 32 and the tilt amount of the optical module 101 can be made to have a linear relationship.

[0062] As described above, the rotation angle of the optical module 101 is fixed with respect to the unit movement amount L of the slider 32 of the linear motion mechanism of the adjustment unit 301 (i.e., the unit movement amount L of the slider 32 and the rotation angle of the optical module 101 are linear), so that the orientation (i.e., the rotation angle) of the optical axis A of the optical module 101 can be adjusted with high resolution.

[0063] In addition, since the coupling groove of the coupling member 14 of the optical module 101 is a linear coupling groove 14a, it is easy to process the coupling member 14 of the optical module 101.

[0064] In addition, in the above description, the linear coupling groove 14a is a groove having a C-shaped cross section formed by cutting off a part of a cylindrical groove, but it may also be a cylindrical groove without a notch, and in this case, the same effect can also be obtained.

[0065] In addition, in the above description, an example is shown in which pin structures (sliding pins 32b and 32c, second rotary shaft pins 35a and 35b, first rotary shaft pins 15a and 15b, etc.) are provided on the adjustment unit 301 and the optical module 101 side, and groove structures (cam grooves 25a and 25b, second rotary bearings 23a and 23b, first rotary bearings 21a and 21b, etc.) that engage with these pin structures are provided on the fixed member 201 side. However, the relationship between the pins and the grooves can be reversed. For example, the fixed member 201 side can be provided with pin structures, and the adjustment unit 301 and the optical module 101 side can be provided with groove structures. In this case, a protrusion as a cam member can also be provided on the fixed member 201. The protrusion has a guiding surface with an arc shape. The guiding surface with the arc shape defines the rotation of the adjustment unit 301 around the second rotary shaft by translational positions in two directions (Y and Z) that are perpendicular to the second rotary shaft and perpendicular to each other. A pair of rollers or the like are respectively provided on the adjustment unit 301 as follower joints that engage with these protrusions and move along the guiding surface of the protrusions. The same applies to other embodiments.

[0066] Embodiment 2

[0067] Figure 7 It is a side view schematically showing the structure of the headlamp device 2000 according to Embodiment 2. Figure 8 It is an exploded perspective view schematically showing the structure of the headlamp device 2000. The difference between the headlamp device 2000 according to Embodiment 2 and the headlamp device 1000 according to Embodiment 1 lies in the shape of the linear coupling groove 14b of the optical module 102 and the shape of the protrusion 39 of the adjustment unit 302. In addition, the fixed member 202 is the same as the fixed member 201 according to Embodiment 1.

[0068] In Embodiment 1, the linear coupling groove 14a of the optical module 101 is a groove having a C-shaped cross section that extends linearly in the substantially ±Z-axis direction. In Embodiment 2, the linear coupling groove 14b of the optical module 102 is a groove having a U-shaped cross section that extends in the ±X-axis direction. In addition, in Embodiment 1, the protrusion 33 of the adjustment unit 301 is a sphere that is rotatably fitted to the linear coupling groove 14a. In Embodiment 2, the protrusion 39 of the adjustment unit 302 is a cylinder that is rotatably fitted to the linear coupling groove 14b around the X-axis and has the X-axis direction as its axial direction. As Figure 7 and Figure 8 shown, in the headlamp device 2000, the linear coupling groove 14b of the optical module 102 has two planes that are parallel to the XZ plane and face each other to clamp the protrusion 39 in the up and down direction.

[0069] The headlight device 2000 of Embodiment 2 operates in the same manner as the headlight device 1000 of Embodiment 1, as Figure 6 shown.

[0070] As described above, the rotation angle of the optical module 102 is fixed with respect to the unit movement amount L of the slider 32 of the linear motion mechanism of the adjustment unit 302 (that is, the unit movement amount L of the slider 32 and the rotation angle of the optical module 102 are linear), so that the orientation (i.e., the rotation angle) of the optical axis A of the optical module 102 can be adjusted with high resolution.

[0071] In addition, since the coupling groove of the coupling member 14 of the optical module 102 is a linear coupling groove 14b, it is easy to process the coupling member 14 of the optical module 102.

[0072] In other aspects, Embodiment 2 is the same as Embodiment 1.

[0073] <<Embodiment 3>>

[0074] Figure 9 FIG. is a side view schematically showing the structure of the headlight device 3000 of Embodiment 3. Figure 10 FIG. is a perspective view schematically showing the structure of the headlight device 3000. Figure 11 FIG. is an exploded perspective view schematically showing the structure of the headlight device 3000. The headlight device 3000 of Embodiment 3 is different from the headlight device 1000 of Embodiment 1 in the shape of the C-shaped coupling groove 14c of the coupling member 14 of the optical module 103 and the groove shapes of the cam grooves 25a and 25b.

[0075] In the headlight device 1000 of Embodiment 1, a linear coupling groove 14a is provided in the coupling member 14 of the optical module 101, and the linear coupling groove 14a extends linearly in the front-rear direction (substantially the ±Z-axis direction). In the headlight device 3000 of Embodiment 3, as Figures 9 to 11 shown, a C-shaped coupling groove 14c is provided in the coupling member 14 of the optical module 103, and in the case of observing in the X-axis direction (that is, in side view), the C-shaped coupling groove 14c is C-shaped. The protrusion 33 fixed to the slider 32 is a sphere and is fitted into the C-shaped coupling groove 14c. In the headlight device 3000, the groove shapes of the cam grooves 25a and 25b are formed such that the center of the sphere of the protrusion 33 passes through a locus on an arc centered on the first rotation axis 15 (the locus T shown later). Figure 12 shown.

[0076] In Embodiment 3, the contact point where the C-shaped engagement groove 14c contacts the protrusion 33 moves in a manner of rotating around the first rotation axis 15. Therefore, by forming the groove shapes of the cam grooves 25a and 25b into an arc shape such that the rotation angles θ1 and θ2 of the contact point where the C-shaped engagement groove 14c contacts the protrusion 33 around the first rotation axis 15 are fixed with respect to the unit movement amount L of the slider 32 in the direction of the sliding axis 34, the rotation angles θ1 and θ2 of the optical module 103 to which the rotational force is transmitted, corresponding to the unit movement amount L of the linear motion mechanism, are fixed. That is, there is a linear relationship between the unit movement amount L of the linear motion mechanism and the rotation angle of the optical module 103. If configured in this way, the orientation of the optical axis A of the optical module 103 (i.e., the rotation angle in the vertical direction) can be adjusted with a high resolution.

[0077] Figure 12 FIG. is a schematic diagram showing the relationship between the rotation of the optical module 103 and the rotation of the adjustment unit 303 of the headlamp device 3000 according to Embodiment 3. Figure 12 FIG. shows the mutual positional relationship of the first rotation axis 15, the second rotation axis 35, the sliding axis 34, and the spherical center of the protrusion 33 of the optical module 103 of the headlamp device 3000, and the relationship between the rotation angle of the optical module 103 and the rotation angle of the adjustment unit 303. Here, the slope of the optical module 103 is represented by a line segment connecting the position 33d (or 33e, etc.) of the spherical center of the first rotation axis 15 and the protrusion 33, and the slope of the adjustment unit 303 is represented by a line segment connecting the position 33b (or 33c, 33d, 33e, etc.) of the spherical center of the second rotation axis 35 and the protrusion 33.

[0078] In Figure 12 , when the spherical center of the protrusion 33 is at the position 33a, the slope of the optical module 103 is 0 (horizontal), and the slope of the adjustment unit 303 (sliding axis 34a) is also 0 (vertical). Next, when the slider 32 ( Figure 12 not shown in FIG.) moves along the sliding axis 34a in the +Y-axis direction by the unit movement amount L, the spherical center of the protrusion 33 moves from the position 33a by the movement amount of the unit movement amount L to the position 33d, and this position 33d is on the arc-shaped locus T with the first rotation axis 15 as the center and the radius r connecting the first rotation axis 15 and the second rotation axis 35.

[0079] Furthermore, the slider 32 ( Figure 12(Not shown in the figure.) When the protrusion 33 moves a movement amount of 2L (i.e., twice the unit movement amount L) in the +Y-axis direction along the sliding axis 34a from the initial position, the position of the ball center of the protrusion 33 moves to a position 33e on a circular arc with a radius r centered on the first rotation axis 15 at a distance of the movement amount 2L from the position 33a. In this way, the groove shapes of the cam grooves 25a and 25b are formed such that the ball center of the protrusion 33 passes through a locus T on a circular arc with a radius r connecting the positions 33a, 33d, and 33e.

[0080] At this time, the angles θ1 and θ2, which are the rotation angles of the optical module 103 corresponding to the unit movement amount L of the slider 32, are not exactly the same strictly speaking, and there is a slight non-linearity between the unit movement amount L and the rotation angle of the optical module 103. However, as long as it is within the normal adjustment range of the optical axis adjustment, that is, within about ±10 degrees sandwiching the horizontal axis, the influence of the non-linearity is small enough to be negligible. Thus, it is possible to fix the tilt amount about the X-axis centered on the first rotation axis 15 corresponding to the unit movement amount L.

[0081] Figure 13 FIG. is a perspective view showing another supporting method of the first rotation axis 15 of the headlight device 3000 showing a modification of Embodiment 1. In Figure 13 this, the first rotation axis pins 15a and 15b of the holding member 13 provided on the optical module 103 are supported by the guide grooves 28a and 28b, which are parallel to the XZ plane and are parallel to each other in a form that sandwiches the first rotation axis pins 15a and 15b in the Y-axis direction. The guide grooves 28a and 28b are fixed to the fixing member 203 ( Figure 11 shown). Here, the guide grooves 28a and 28b are structured to restrict the translation in the Y-axis direction and the rotation about the Z-axis of the first rotation axis 15 of the first rotation axis pins 15a and 15b, but not to restrict the rotation of the first rotation axis 15 about the X-axis. In other words, through the guide grooves 28a and 28b and the first rotation axis pins 15a and 15b, the optical module 103 is supported so as to be rotatable about the first rotation axis 15, and the translation of the optical module 103 in the Y-axis direction and the rotation about the Z-axis are restricted.

[0082] In addition, the optical module 103 has a rotation axis 26 perpendicular to the first rotation axis 15 (in the example in the figure, it is the Y-axis. Hereinafter, it is also referred to as the third rotation axis 26). In this example, the pins 26a and 26b constituting the third rotation axis 26 are fixed to the fixing member 203 ( Figure 11as shown). Further, guide grooves 18a and 18b that engage with such pins 26a and 26b are provided in the holding member 13. Here, the guide grooves 18a and 18b are configured to restrict translation in the X-axis direction and rotation about the Z-axis without restricting the rotation of the pins 26a and 26b about the third rotation axis (Y-axis). In other words, the optical module 103 is supported by the guide grooves 18a and 18b and the pins 26a and 26b so as to be rotatable about the third rotation axis 26, and translation of the optical module 103 in the X-axis direction and rotation about the Z-axis are restricted.

[0083] For example, in the case of supporting the holding member 13 including the first rotation axis pins 15a and 15b and the guide grooves 18a and 18b by such a structure, the C-shaped engagement groove 14c formed in the connecting member 14 and the protruding portion 33 that engages therewith do not restrict the rotation of the optical module 103 about the Y-axis. Therefore, in the headlamp device 3000, in addition to the rotation adjustment about the X-axis shown in the above headlamp device 3000, the optical module 103 can be rotationally adjusted in the left-right direction, that is, about the Y-axis.

[0084] The rotation adjustment mechanism of the headlamp device 3000 is effective as an optical axis adjustment unit of a headlamp device for four wheels. Here, the rotation adjustment mechanism of the headlamp device 3000 can also be applied to other uses such as lighting devices such as road surface lighting or induction lighting, display devices, and rotation mechanisms that use a straight-ahead mechanism to rotate a module with high precision. In particular, this rotation adjustment mechanism is suitable for a rotation mechanism of a small module.

[0085] In addition, in the rotation adjustment mechanism of the headlamp device 3000, the adjustment unit 303 is configured to be rotatably supported relative to a second rotation axis 35 provided at a position different from the first rotation axis 15 by a fixing member 203, and cam grooves 25a and 25b are provided. The cam grooves 25a and 25b restrict the rotation of the adjustment unit 303 about the second rotation axis 35 by translational positions in two directions perpendicular to the second rotation axis 35 and perpendicular to each other (in this example, the Y-axis direction and the Z-axis direction) (more specifically, the movement of the contact point where the protrusion 33 contacts the C-shaped coupling groove 14c about the first rotation axis 15). According to such a structure, compared with a structure in which the rotation axis (first rotation axis 15) of the optical module 103 coincides with the rotation axis of the linear motion mechanism of the adjustment unit 303, and the adjustment unit 303 is mounted on the optical module 103 and rotates integrally (in this case, the adjustment unit 303 is inclined in an arc shape of a circle concentric with the first rotation axis 15), the arrangement of the adjustment unit 303 is not limited to rotation about the first axis. Therefore, miniaturization can be achieved particularly in applications where the installation location and driving range are limited within a housing such as a vehicle lamp. In addition, instead of mounting the adjustment unit 303 on the rotation object module on the side to be adjusted, the adjustment unit 303 is supported on the fixing member 203 side, thereby enabling the overall weight reduction of the movable part and facilitating high-speed adjustment.

[0086] In addition, in Figure 13 the example of, a set of pins coaxially arranged with the holding member 13 interposed therebetween is illustrated as a constituent member of the rotation axis, but the structure of the rotation axis is not limited thereto. For example, the above-described rotation axis pin may be constituted by a columnar body that is a single rod extending in the rotation axis direction.

[0087] <<Embodiment 4>>

[0088] Figure 14 is a side view schematically showing the structure of the headlamp device 4000 according to Embodiment 4. Figure 15 is a perspective view schematically showing the structure of the headlamp device 4000. Figure 16 is an exploded perspective view schematically showing the structure of the headlamp device 4000. The headlamp device 4000 according to Embodiment 4 is different from the above-described headlamp devices 1000, 2000, and 3000 in the shape of the arc coupling groove 16 of the coupling member 14 of the optical module 104, the shape of the fixing member 204, and the fixing of the adjustment unit 304 to the fixing member 204.

[0089] In Embodiment 4, the arc-shaped engaging groove 16, which is the engaging groove of the connecting member 14 of the optical module 104, is a groove having a C-shaped cross-section that extends in an arc shape in the substantially ±Z-axis direction and slopes downward as it approaches the adjustment unit 304. That is, the shape of the cross-section of the arc-shaped engaging groove 16 cut by a plane parallel to the XY plane is C-shaped, and the shape in the length direction of the groove is arc-shaped. Further, the protrusion 33 is fitted into the arc-shaped engaging groove 16, and the protrusion 33 is fixed to the slider 32 of the adjustment unit 304.

[0090] Further, in the above headlight devices 1000, 2000, and 3000, the bracket 37 includes second rotary shaft pins 35a and 35b, and second rotary bearings 23a and 23b are provided on the fixing members 201, 202, and 203. The adjustment units 301, 302, and 303 are supported so as to be rotatable about the X-axis relative to the fixing members 201, 202, and 203. In contrast, in the headlight device 4000 of Embodiment 4, the bracket 37 of the adjustment unit 304 is fixed to the fixing member 204 and does not rotate relative to the fixing member 204.

[0091] Next, the rotation operation of the headlight device 4000 will be described. In Figures 14 to 16 , the feed screw 31 is rotated about the Y-axis by driving the motor 38. Thus, for example, when the slider 32 moves in the +Y-axis direction, the protrusion 33 fixed to the slider 32 moves in the +Y-axis direction, which is the upward direction, while being fitted into the arc-shaped engaging groove 16 provided in the connecting member 14. By this operation, the optical module 104 rotates about the X-axis with the first rotary shaft 15 as the rotation center. When the slider 32 moves in the +Y-axis direction, which is the upward direction, the optical module 104 rotates about the X-axis with the first rotary shaft 15 as the center (i.e., counterclockwise in Figure 14 ). Further, when the slider 32 moves in the -Y-axis direction, which is the downward direction, the optical module 104 rotates about the X-axis with the first rotary shaft 15 as the center (i.e., clockwise in Figure 14 ). The rotation of the optical module 104 about the first rotary shaft 15 is restricted by the contact point where the arc-shaped engaging groove 16 contacts the protrusion 33.

[0092] Here, the tilt amount of the optical module 104 about the X-axis with the first rotary shaft 15 as the center is defined by the Y coordinate position of the spherical center of the protrusion 33 provided on the slider 32 and the groove shape of the arc-shaped engaging groove 16 that engages with the protrusion 33. That is, for the tilt amount of the optical module 104 about the X-axis with the first rotary shaft 15 as the center corresponding to the translational movement amount of the slider 32 in the Y-axis direction, it can be arbitrarily set by adjusting the groove shape of the arc-shaped engaging groove 16, which is equivalent to a cam shape, that engages with the protrusion 33.

[0093] When the tilt amount of the optical module 104 about the X-axis with respect to the first rotation axis 15 is fixed relative to the fixed translational movement amount of the slider 32 in the Y-axis direction, that is, when the tilt amount of the optical module 104 about the X-axis corresponding to the translational movement amount of the slider 32 in the Y-axis direction is linear, the groove shape of the arc engagement groove 16 is configured such that the arc engagement groove 16 always contacts Figure 17 the position of the ball center of the protrusion 33 shown.

[0094] Figure 17 FIG. is a schematic diagram showing the relationship between the rotation of the optical module 104 of the headlamp device 4000 and the position of the ball center of the protrusion 33 of the adjustment unit 304. Figure 17 FIG. shows the relationship between the position relationship of the first rotation axis 15, the slide axis 34, the ball center of the protrusion 33, and the groove contact point of the arc engagement groove 16 of the headlamp device 4000 and the rotation angle of the optical module 104. Here, the slope of the optical module 104 is represented by a line segment connecting the first rotation axis 15 and the groove contact point 16a.

[0095] In Figure 17 FIG., when the ball center of the protrusion 33 is located at the position 33a, the slope of the optical module 104 is 0 (horizontal). At this time, the arc engagement groove 16 contacts the protrusion 33 with the ball center at the position 33a at the groove contact point 16a.

[0096] Next, in order to make the optical module 104 tilt by an angle θ0 when the ball center of the protrusion 33 moves to the position 33b as the slider 32 ( Figure 17 not shown in FIG.) moves a unit movement amount L along the slide axis 34 in the +Y-axis direction, the groove contact point 16b can be set at the same position as the position of the ball center 33b, and the arc engagement groove 16 can be configured to smoothly connect the groove contact point 16a and the groove contact point 16b.

[0097] In addition, in order to make Figure 17(Not shown in the figure.) When the ball center of the protrusion 33 moves to the position 33c by moving the moving amount 2L (i.e., twice the unit moving amount L) in the +Y-axis direction along the sliding axis 34 from the initial position, the inclination angle 2θ0 of the optical module 104 is such that the groove contact 16c can be provided at the same position as the position 33c of the ball center, and the arc coupling groove 16 is extended in a manner that smoothly connects the groove contact 16b and the groove contact 16c. That is, if the groove shape of the arc coupling groove 16 is formed in a manner that smoothly connects the groove contacts 16a, 16b, 16c that contact the positions 33a, 33b, 33c of the ball center of the protrusion 33, the inclination amount of the optical module 104 about the X-axis with the first rotation axis 15 as the center can be fixed with respect to the fixed translation amount of the slider 32 in the Y-axis direction. That is, the inclination amount of the optical module 104 about the X-axis with the first rotation axis 15 as the center can be made linear with respect to the translation amount of the slider 32 in the Y-axis direction.

[0098] As described above, the rotation angle of the optical module 104 is fixed with respect to the unit moving amount L of the slider 32 of the linear motion mechanism of the adjustment unit 304 (i.e., the unit moving amount L of the slider 32 and the rotation angle of the optical module 104 are linear), so that the orientation (i.e., the rotation angle) of the optical axis A of the optical module 104 can be adjusted with high resolution.

[0099] In addition, since it is a simple structure in which the adjustment unit 304 is fixedly supported by the fixed member 204, it is easy to manufacture.

[0100] In addition, in the above description, the arc coupling groove 16 is a groove having a C-shaped cross section formed by cutting off a part of a cylindrical groove, but it can also be a cylindrical groove without a notch, and in this case, the same effect can be obtained.

[0101] <<Embodiment 5>>

[0102] Figure 18 It is a side view schematically showing the structure of the headlamp device 5000 according to Embodiment 5. Figure 19 It is an exploded perspective view schematically showing the structure of the headlamp device 5000. The difference between the headlamp device 5000 according to Embodiment 5 and the headlamp device 4000 according to Embodiment 4 lies in the shape of the arc coupling groove 17 of the connecting member 14 of the optical module 105 and the shape of the protrusion 39 of the adjustment unit 305. In addition, the fixed member of Embodiment 5 is the same as the fixed member 204 of Embodiment 4.

[0103] In Embodiment 4, the arc-shaped coupling groove 16 of the optical module 104 is a groove having a C-shaped cross section that extends in an arc shape in the substantially ±Z-axis direction, while in Embodiment 5, the arc-shaped coupling groove 17 of the optical module 105 is a groove having a U-shaped cross section that extends in the ±X-axis direction. Further, in Embodiment 4, the protrusion 33 of the adjustment unit 304 is a sphere that is rotatably fitted to the arc-shaped coupling groove 16, while in Embodiment 5, the protrusion 39 of the adjustment unit 305 is a cylinder having the X-axis direction as its axis that is rotatably fitted to the arc-shaped coupling groove 17. As Figure 18 and Figure 19 shown, in the headlamp device 5000, the arc-shaped coupling groove 17 of the optical module 105 has two curved surfaces that are parallel to the XZ plane and face each other with the protrusion 39 being clamped therebetween in the vertical direction.

[0104] The headlamp device 5000 of Embodiment 5 operates in the same manner as the headlamp device 4000 of Embodiment 4, as Figure 17 shown.

[0105] As described above, the rotation angle of the optical module 105 is fixed with respect to the unit movement amount L of the slider 32 of the linear motion mechanism of the adjustment unit 305 (that is, the unit movement amount L of the slider 32 and the rotation angle of the optical module 105 are linear), and thus the orientation (i.e., rotation angle) of the optical axis A of the optical module 105 can be adjusted with high resolution.

[0106] Further, since it has a simple structure in which the adjustment unit 305 is fixedly supported by the fixed member, it is easy to manufacture.

[0107] In addition, in other aspects than those described above, Embodiment 5 is the same as Embodiment 4.

[0108] Reference Numeral Explanation

[0109] 101, 102, 103: optical module; 11: light source unit; 12: optical component; 13: holding member; 14: connecting member; 14a, 14b: linear coupling groove; 15: first rotation axis; 15a, 15b: first rotation axis pin; 201, 202, 203: fixed member; 21a, 21b: first rotation bearing; 25a, 25b: cam groove; 23a: second rotation bearing; 301, 302, 303: adjustment unit; 32: slider; 32b, 32c: sliding pin; 33, 39: protrusion; 34: sliding shaft; 35: second rotation axis; 35a, 35b: second rotation axis pin; 37: bracket; 38: motor; 26: third rotation axis; 1000, 2000, 3000: headlamp device; A: optical axis.

Claims

1. A rotary adjustment mechanism, wherein, The rotation adjustment mechanism includes: a rotation object module that is supported by a fixed member so as to be rotatable about a first rotation axis; and an adjustment unit that is supported by the fixed member and includes a slider that can move along a slide axis in a direction perpendicular to the first rotation axis. The adjustment unit is supported so as to be rotatable about a second rotation axis that is parallel to the first rotation axis and is provided on the fixed member. The rotation object module has a coupling groove. The slider has a protrusion and a sliding member. The protrusion is engaged with the coupling groove, and the sliding member contacts the fixed member at a position other than the second rotation axis. The fixed member has a cam member that engages with the sliding member, and the rotation of the adjustment unit about the second rotation axis is defined by translational positions in two directions that are perpendicular to the second rotation axis and perpendicular to each other. The cam member has a guiding surface with an arc shape that keeps the rotation angle about the first rotation axis of the contact point where the coupling groove contacts the protrusion corresponding to the unit movement amount of the slider in a direction parallel to the slide axis fixed.

2. The rotation adjustment mechanism according to claim 1, wherein the coupling groove is a linear groove that extends in a direction perpendicular to the first rotation axis and parallel to a straight line connecting the first rotation axis and the protrusion.

3. The rotation adjustment mechanism according to claim 1, wherein when viewed in a side view along a direction perpendicular to the first rotation axis, the coupling groove is in a C shape or a circular shape.

4. The rotation adjustment mechanism according to claim 2, wherein when viewed in a side view along a direction perpendicular to the first rotation axis, the coupling groove is in a C shape or a circular shape.

5. The rotation adjustment mechanism according to claim 2, wherein the protrusion is a sphere.

6. The rotation adjustment mechanism according to claim 3, wherein the protrusion is a sphere.

7. The rotation adjustment mechanism according to claim 4, wherein the protrusion is a sphere.

8. The rotation adjustment mechanism according to claim 1, wherein the coupling groove is a linear groove that extends in a direction parallel to the first rotation axis.

9. The rotation adjustment mechanism according to claim 8, wherein the shape of a cross section of the coupling groove cut by a plane perpendicular to the first rotation axis is a U shape.

10. The rotation adjustment mechanism according to claim 9, wherein the protrusion is a cylinder that has an axis extending in a direction parallel to the first rotation axis.

11. The rotation adjustment mechanism according to claim 8, wherein the shape of a cross section of the coupling groove cut by a plane perpendicular to the first rotation axis is a C shape.

12. The rotation adjustment mechanism according to claim 11, wherein the protrusion is a sphere.

13. The rotation adjustment mechanism according to any one of claims 1 to 12, wherein the rotation object module has: a light source unit; and an optical component that changes the light distribution of light emitted from the light source unit.

14. The rotational adjustment mechanism according to any one of claims 1 to 12, wherein, the rotatable object module is supported so as to be rotatable relative to the fixed member about the first rotation axis and about a third rotation axis perpendicular to the first rotation axis.

15. The rotational adjustment mechanism according to claim 13, wherein, the rotatable object module is supported so as to be rotatable relative to the fixed member about the first rotation axis and about a third rotation axis perpendicular to the first rotation axis.

16. The rotational adjustment mechanism according to any one of claims 1 to 12, wherein, the sliding member is a pair of pins, the pair of pins being provided on an end surface of the slider in a direction parallel to the first rotation axis, the cam member is a pair of arcuate grooves, the pair of arcuate grooves being provided on an end surface of the fixed member in a direction parallel to the first rotation axis and engaging with the pair of pins to define rotation of the adjustment unit about the second rotation axis.

17. The rotational adjustment mechanism according to claim 13, wherein, the sliding member is a pair of pins, the pair of pins being provided on an end surface of the slider in a direction parallel to the first rotation axis, the cam member is a pair of arcuate grooves, the pair of arcuate grooves being provided on an end surface of the fixed member in a direction parallel to the first rotation axis and engaging with the pair of pins to define rotation of the adjustment unit about the second rotation axis.

18. The rotational adjustment mechanism according to claim 14, wherein, the sliding member is a pair of pins, the pair of pins being provided on an end surface of the slider in a direction parallel to the first rotation axis, the cam member is a pair of arcuate grooves, the pair of arcuate grooves being provided on an end surface of the fixed member in a direction parallel to the first rotation axis and engaging with the pair of pins to define rotation of the adjustment unit about the second rotation axis.

19. The rotational adjustment mechanism according to claim 15, wherein, the sliding member is a pair of pins, the pair of pins being provided on an end surface of the slider in a direction parallel to the first rotation axis, the cam member is a pair of arcuate grooves, the pair of arcuate grooves being provided on an end surface of the fixed member in a direction parallel to the first rotation axis and engaging with the pair of pins to define rotation of the adjustment unit about the second rotation axis.

20. A headlight device, wherein, The headlamp device includes: the rotational adjustment mechanism according to any one of claims 1 to 19; and the fixed member.

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