Motor device

Abstract

One embodiment of the present invention is a motor device comprising: a circuit board having a through hole; a stator arranged opposite a first surface, which is one surface of the circuit board, and having a stator core and a coil composed of a conductive wire wound around the stator core; and a cover arranged opposite a second surface, which is opposite to the first surface of the circuit board, and covering the second surface of the circuit board, wherein the coil or a conductive component in contact with the coil passes through the through hole and protrudes from the second surface, and the cover has an opening that exposes the through hole.

Description

Technical Field

[0001] The present invention relates to a motor device. Background Art

[0002] In motor devices, it is necessary to provide electrical continuity between a circuit board and a coil composed of a conductive wire wound around a stator core via an insulating member. For example, in the motor described in Japanese Patent Application Laid-Open No. 2017-135854, lead wires at the start and end of the coil winding are connected to a printed circuit board. Summary of the Invention

[0003] Problems to be solved by the invention

[0004] During motor device manufacturing, to establish electrical continuity between a coil and a circuit board, one end of the coil or a conductive component, such as a conductive pin connected to the coil end, is soldered to the circuit board. When soldering is performed on the main mounting surface of the circuit board, it is necessary to secure an area for the solder fillet on that surface, which can sometimes prevent efficient component mounting or wiring on the main mounting surface.

[0005] Therefore, an object of the present invention is to provide effective mounting of components and wiring on a main mounting surface of a circuit board without impairing electrical continuity between a coil and a circuit board during manufacture of a motor device.

[0006] Means for solving problems

[0007] The first invention illustrated in the present application is a motor device, which includes a circuit board having a through hole; a stator, which is arranged opposite to a first surface which is one surface of the circuit board, and has a stator core and a coil composed of a conductive wire wound on the stator core; and a cover, which is arranged opposite to a second surface on the opposite side of the first surface of the circuit board and covers the second surface of the circuit board, the coil or a conductive component in contact with the coil passes through the through hole and protrudes from the second surface, and the cover has an opening for exposing the through hole.

[0008] Effects of the Invention

[0009] According to the present invention, when manufacturing a motor device, when the coil is electrically connected to the circuit board, components and wiring on the main mounting surface of the circuit board can be efficiently mounted without damaging them. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a perspective view of the motor device according to the embodiment as seen from one side.

[0011] Figure 2 This is a perspective view of the motor device according to the embodiment as seen from the other side.

[0012] Figure 3It is a cross-sectional view of the motor device according to the embodiment.

[0013] Figure 4 This is an exploded perspective view of main components of the motor device according to the embodiment.

[0014] Figure 5 This is an exploded perspective view of the stator of the motor device according to the embodiment, with coils removed.

[0015] Figure 6 This is an enlarged front view of one of the insulators included in the stator.

[0016] Figure 7 This is an enlarged front view of another insulator included in the stator.

[0017] Figure 8 This is an enlarged front view of the stator of the motor device according to the embodiment.

[0018] Figure 9 This is a diagram showing the structure of the assembled state after the stator is press-fitted into the sleeve when assembling the motor device according to the embodiment, as viewed from the circuit board side in the axial direction.

[0019] Figure 10 yes Figure 9 An enlarged cross-sectional view of the structure in the assembled state.

[0020] Figure 11 This is a diagram showing the structure of the assembled state after the stator is press-fitted into the sleeve when assembling the motor device according to the embodiment, as viewed from the cover side in the axial direction.

[0021] Figure 12 yes Figure 11 AA cross-sectional view.

[0022] Figure 13 It is a horizontal cross-sectional view of a vehicle headlamp to which the motor device according to the embodiment is applied. DETAILED DESCRIPTION

[0023] The present invention relates to Japanese Patent Application No. 2018-184356 filed with the Japan Patent Office on September 28, 2018, the entire contents of which are incorporated herein by reference.

[0024] Hereinafter, embodiments of the motor device according to the present invention will be described.

[0025] (1) Schematic Structure of Motor Device 1 According to Embodiment

[0026] Below, refer to Figures 1 to 4 A schematic configuration of the motor device 1 according to the embodiment will be described.

[0027] Figure 1This is a perspective view of the motor device 1 according to the embodiment as seen from one side. Figure 2 This is a perspective view of the motor device 1 according to the embodiment as seen from the other side. Figure 3 It is a cross-sectional view of the motor device 1 according to the embodiment. Figure 4 It is an exploded perspective view of main components of the motor device 1 according to the embodiment.

[0028] In the following description, "axial direction" means the axial direction of the sleeve 9 of the motor device 1. The axial direction is equivalent to the rotation axis of the shaft 5 ( Figure 3 axis CTR).

[0029] like Figures 1 to 3 As shown, the motor device 1 of the embodiment includes a circuit board 3, a yoke 4, a shaft 5, a rotating body 6, a cover 2 covering the rotating body 6, and a stator 8, and rotates the rotating body 6 by a DC brushless motor.

[0030] The cover 2 is made of resin, for example, and has a rectangular parallelepiped shape with a bottom. Figure 4 As shown, a sleeve 9 (an example of a cylindrical member) is mounted on the cover 2. The sleeve 9 is made of metal such as iron or aluminum and is disposed in a hole provided in the center of the circular bottom of the cover 2. The cover 2 and the sleeve 9 are integrated by insert molding.

[0031] The circuit board 3 and the coil (winding) 83 of the stator 8 are connected via a conducting pin 84 (an example of a conductive member; see Figure 3 and Figure 4 ) and is turned on. A control circuit (not shown) is mounted on the circuit board 3. The circuit board 3 provides current to the coil 83.

[0032] like Figure 4 As shown, the circuit board 3 has a first surface 3a as the surface facing the yoke 4 and a second surface 3b as the surface facing the cover 2. The second surface 3b is the back surface of the first surface 3a. The first surface 3a is the main mounting surface on which the main circuit components are mounted.

[0033] An inner hole 3 h is formed near the center of the circuit board 3 , and the circuit board 3 and the sleeve 9 are connected by press-fitting the inner hole 3 h into the outer peripheral surface of the sleeve 9 .

[0034] The circuit board 3 has two through holes 32. Figure 2 and Figure 3 As shown, screws 22 are passed through through holes 32 and fastened to cover 2, thereby restricting circumferential displacement of circuit board 3 relative to cover 2. Cover 2 is arranged opposite to second surface 3b of circuit board 3 on the opposite side of first surface 3a, covering second surface 3b of circuit board 3.

[0035] like Figure 4As shown, the cover 2 has two openings 24, and the circuit board 3 has two through-holes 34. As will be described later, in the motor device 1 of this embodiment, a conducting pin 84, one end of which is fixed to the coil 83 of the stator 8, has its other end inserted through the through-hole 34 of the circuit board 3 and soldered to the second surface 3b (the surface facing the cover 2) of the circuit board 3. The openings 24 of the cover 2 are provided to facilitate the soldering of the conducting pin 84.

[0036] like Figure 3 As shown, the shaft 5 extends in the axial direction of the motor device 1. One end of the shaft 5 is fixed to the support portion 41. The support portion 41 is made of metal, for example, and the yoke 4 and the support portion 41 are joined by pressing the support portion 41. The support portion 41 is supported by the force of the coil spring 53 provided between the support portion 41 and the bearing 52. Figure 3 The inner surface of the yoke 4 is ( Figure 3 (press to the left of the .

[0037] One end of the shaft 5 is press-fitted into the support portion 41, and the other end of the shaft 5 is fixed to the rotating body 6. The shaft 5 passes through the interior of the sleeve 9 and is supported by bearings 51 and 52 at one end and the other end of the sleeve 9 in the axial direction, respectively.

[0038] like Figure 2 and Figure 4 As shown, the yoke 4 is in a substantially annular shape. A magnet 7 is pressed into the inner peripheral surface of the yoke 4 (see Figure 3 The magnet 7 is magnetized so that the north pole and the south pole are alternately arranged in the circumferential direction. The yoke 4 is made of a magnetic body and prevents the magnetic field generated by the magnet 7 from leaking outside the magnet 7.

[0039] like Figure 3 As shown, the stator 8 is arranged opposite to the first surface 3 a of the circuit board 3 and includes a stator core 81 , an insulating member 82 attached to the stator core 81 , and a coil 83 composed of a conductive wire wound around the stator core 81 via the insulating member 82 .

[0040] In this embodiment, the magnet 7 and the shaft 5 constitute a rotor. The motor of this embodiment is an outer rotor type DC brushless motor in which the rotor is positioned radially outward of the stator 8 .

[0041] (2) Structure of stator 8 according to the embodiment

[0042] Next, refer to Figures 5 to 8 , the structure of the stator 8 is described in further detail.

[0043] Figure 5 It is an exploded perspective view of the stator 8 excluding the coil 83 . Figure 6 It is an enlarged front view of the first insulator 82A when viewed from the yoke 4 side in the axial direction. Figure 7It is an enlarged front view of the second insulator 82B when viewed from the rotating body 6 side in the axial direction. Figure 8 It is an enlarged front view of the stator 8 (viewed from the yoke 4 side).

[0044] Figure 5 The stator core 81 , the insulating member 82 (a first insulator 82A, a second insulator 82B), and the conducting pin 84 are shown.

[0045] like Figure 5 As shown, the stator core 81 is a plurality of magnetic steel plates arranged in the axial direction (in Figure 3 The stacked body (in the left-right direction) is stacked and fixed, and has a plurality of teeth 811. In the example of this embodiment, the teeth 811 are provided at intervals of 90 degrees along the circumferential direction of the stator core 81.

[0046] An inner hole 81h is formed in the center of the stator core 81. The inner circumferential surface 81a of the inner hole 81h is pressed into the outer circumferential surface of the sleeve 9 when the stator 8 and the sleeve 9 are coupled. That is, the stator core 81 is mounted on the sleeve 9 such that the inner circumferential surface 81a of the inner hole 81h of the stator core 81 contacts the outer circumferential surface of the sleeve 9.

[0047] like Figure 5 As shown, the insulating member 82 is made of an insulating material such as rubber or resin, and insulates the coil 83 from the teeth 811. It is composed of a first insulator 82A and a second insulator 82B that sandwich the stator core 81 from both sides. The first insulator 82A and the second insulator 82B have inner holes 82Ah and 82Bh for inserting the sleeve 9.

[0048] like Figure 5 and Figure 6 As shown, the first insulator 82A has tooth cover portions 821A at 90-degree intervals along the circumference of the inner hole 82Ah, corresponding to the teeth 811 of the stator core 81. The first insulator 82A has an inner circumferential wall 823A extending axially around the periphery of the inner hole 82Ah. Specifically, the inner circumferential wall 823A extends axially on the side opposite to the side where the stator core 81 is located, relative to the tooth cover portion 821A. The wall portion 822A extends axially on the side where the stator core 81 is located, relative to the tooth cover portion 821A.

[0049] like Figure 5 and Figure 7As shown, the second insulator 82B has tooth cover portions 821B at 90-degree intervals along the circumference of the inner hole 82Bh, corresponding to the teeth 811 of the stator core 81. The second insulator 82B has an inner circumferential wall 823B that protrudes axially from the circumference of the inner hole 82Bh. Specifically, the inner circumferential wall 823B extends axially on the side opposite to the side where the stator core 81 is located, relative to the tooth cover portion 821B. The wall portion 822B extends axially on the side where the stator core 81 is located, relative to the tooth cover portion 821B.

[0050] As described above, the first insulator 82A and the second insulator 82B each have a wall surface (inner circumferential walls 823A and 823B) extending along the circumference of the inner hole 81h of the stator core 81 and in the axial direction of the sleeve 9 into which the stator 8 is press-fitted, thereby isolating the teeth 811 of the stator core 81 from the coils 83. The provision of the inner circumferential walls 823A and 823B ensures reliable insulation between the coils 83 and the teeth 811.

[0051] Refer again Figure 5 and Figure 6 A notch 823Ah is formed in the inner peripheral wall 823A of the first insulator 82A. As will be described later, the notch 823Ah is provided to expose the surface of the stator core 81 when the stator 8 is assembled, facilitating the press-fitting of the stator 8 into the sleeve 9. Specifically, the first insulator 82A has the notch 823Ah on the periphery of the inner hole 82Ah, corresponding to the exposed surface of the stator core 81.

[0052] In addition, in the notch portion 823Ah, a protrusion 823Aj is provided from the inner peripheral wall 823A toward the radially outer side. The protrusion 823Aj is provided to reliably insulate the coil 83 and the teeth 811 in the notch portion 823Ah.

[0053] Reference Figure 5 and Figure 7 The second insulator 82B includes a cylindrical portion 824B extending in the axial direction and for the conductive pin 84 to pass through. The cylindrical portion 824B is supported by a wall portion 822B formed in the axial direction, thereby ensuring sufficient strength of the cylindrical portion 824B.

[0054] In addition, no notch is provided in the inner peripheral wall 823B of the second insulator 82B.

[0055] After the stator core 81 is clamped from both sides by the first insulator 82A and the second insulator 82B, a conductive wire is wound around the tooth cover portion 821A, the teeth 811, and the tooth cover portion 821B to form the coil 83. Figure 8 As shown, the stator 8 is assembled.

[0056] After the stator 8 is assembled, Figure 5As shown, the conducting pin 84 is passed through the cylindrical portion 824B, and one end of the conducting pin 84 and one end of the coil 83 are welded together.

[0057] (3) Pressing the stator 8 into the sleeve 9

[0058] Next, refer to Figures 8 to 10 Press-fitting of the stator 8 into the sleeve 9 during assembly of the motor device 1 according to the present embodiment will be described.

[0059] Figure 9 This diagram shows the assembled structure of the motor device 1 according to this embodiment, viewed from the first surface 3a of the circuit board 3 in the axial direction, after the stator 8 is press-fitted into the sleeve 9. Furthermore, during assembly of the motor device 1 according to this embodiment, before the stator 8 is press-fitted into the sleeve 9, the circuit board 3 is secured to the cover 2. Figure 10 yes Figure 9 An enlarged cross-sectional view of the structure in the assembled state.

[0060] like Figure 10 As shown, when the stator 8 is press-fitted into the sleeve 9, the process is as follows: the inner circumferential surface 81a of the inner hole 81h of the stator core 81 of the stator 8 is brought into contact with the outer circumferential surface 9a of the sleeve 9 in the axial direction (the press-fitting direction D from the first surface 3a toward the second surface 3b of the circuit board 3). During press-fitting, the cover 2 is fixed to the device, and the stator 8 is pressed in a predetermined amount in the press-fitting direction using a press-fitting jig.

[0061] In addition, as described above, when the stator 8 is pressed in, one end of the conduction pin 84 is welded to the coil 83. Therefore, by the operator confirming whether the end of the conduction pin 84 is welded, it is possible to avoid pressing the stator 8 in the wrong direction.

[0062] In this embodiment, when the stator 8 is press-fitted by the press-fit jig, a portion of the stator core 81 is exposed. Therefore, by pressing the jig so as to contact the exposed surface of the stator core 81 , the stator 8 can be reliably press-fitted into the sleeve 9 .

[0063] More specifically, if Figure 8 As shown, the stator core 81 of the stator 8 has an exposed surface when viewed from the side of the pressing jig in the axial direction of the sleeve 9, so by making the press jig contact with the exposed surface and pressing the stator core 81 in the axial direction ( Figure 8 By pressing in the inner side of the paper (in the direction of the inner side of the paper), the inner peripheral surface 81a of the inner hole 81h of the stator core 81 can be reliably pressed into the outer peripheral surface 9a of the sleeve 9.

[0064] Figure 8The exposed surface of the stator core 81 shown includes a peripheral region 811a along the periphery of the inner hole 81h of the stator core 81. The peripheral region 811a of the inner hole 81h in the exposed surface is located closest to the outer peripheral surface 9a of the sleeve 9 when the stator 8 is press-fitted into the sleeve 9. Therefore, by bringing the press-fit jig into contact with the peripheral region 811a, the stator 8 can be press-fitted more reliably.

[0065] As reference Figure 6 As described above, the inner peripheral wall 823A of the first insulator 82A is provided with a notch 823Ah. Therefore, after the first insulator 82A is assembled to the stator core 81, Figure 8 As shown, the exposed surface of the stator core 81 is formed by the notch 823Ah. In this embodiment, the protruding region 811p is a region protruding from the peripheral edge of the inner hole 81h of the stator core 81 in the radial direction of the stator core 81.

[0066] If the inner peripheral wall 823A of the first insulator 82A is set at Figure 6 If the state shown is closer to the outside, the peripheral area 811a of the exposed surface can be expanded. Figure 3 As shown, the overall shape of the stator 8 cannot be expanded to ensure clearance between the magnets 7. Therefore, increasing the exposed peripheral area 811a would sacrifice the radial dimensions of the coils 83 and teeth 811, which would affect motor performance. Therefore, notches 823Ah are locally provided along the circumference of the inner peripheral wall 823A of the first insulator 82A, thereby creating protruding areas 811p on the exposed surface of the stator core 81. This ensures an effective exposed area without compromising motor performance.

[0067] In this embodiment, four protruding areas 811p are formed on the exposed surface along the periphery of the inner hole 81h of the stator core 81. The stator 8 is pressed in along the press-fit direction D using a press-fit jig that simultaneously contacts the four protruding areas 811p on the exposed surface. Because the four protruding areas 811p are relatively close to the outer circumferential surface 9a of the sleeve 9, the stator 8 can be reliably pressed in.

[0068] In the example of this embodiment, the protruding areas 811p of the exposed surface of the stator core 81 are arranged at equal intervals along the circumferential direction of the inner hole 81h of the stator core 81. In this example, the protruding areas 811p of the exposed surface of the stator core 81 are arranged at equal intervals along the circumferential direction at four locations between adjacent teeth 811 of the stator core 81. That is, Figure 8In the embodiment, since the protruding region 811 p is provided toward the portion where the coil 83 is not wound, the influence on the arrangement of the coil 83 in the stator 8 is small.

[0069] As reference Figure 6 As described above, the first insulator 82A is provided with a protrusion 823Aj extending from the inner peripheral wall 823A toward the radially outer side at the notch portion 823Ah. Figure 8 As shown, the projection 823Aj of the first insulator 82A is configured to surround at least a portion of the protruding region 811p of the exposed surface of the stator core 81. Therefore, insulation between the teeth 811 and the coil 83 in the protruding region 811p can be reliably performed.

[0070] Furthermore, unlike the inner circumferential wall 823A of the first insulator 82A, the inner circumferential wall 823B of the second insulator 82B does not have a notch. Therefore, when the stator 8 is assembled and viewed from the second insulator 82B side, no protruding area protruding radially outward from the inner hole 81h is formed on the exposed surface of the stator core 81. In other words, the protruding area is provided only on the surface of the stator core 81 on the first insulator 82A side in the axial direction of the sleeve 9, and is not provided on the surface of the stator core 81 on the second insulator 82B side in the axial direction of the sleeve 9. Therefore, by confirming the exposed surface of the stator core 81 on both sides of the stator 8, it is possible to prevent the operator from mis-assembling the stator 8 by misaligning the orientation of the stator 8 when pressing the stator 8 into the sleeve 9.

[0071] (4) Welding of the conduction pin 84

[0072] Next, refer to Figures 10-12 The welding of the conducting pin 84 when assembling the motor device 1 according to the present embodiment will be described.

[0073] Figure 11 This is a diagram showing the structure of the assembled state after the stator 8 is press-fitted into the sleeve 9 when assembling the motor device 1 of the present embodiment, as viewed from the second surface 3 b side of the circuit board 3 in the axial direction. Figure 12 yes Figure 11 AA cross-sectional view.

[0074] When the stator 8 is pressed into place, the conducting pin 84 is inserted into the cylindrical portion 824B of the second insulator 82B of the stator 8, and one end of the conducting pin 84 is welded to the coil 83. When the stator 8 is pressed into the sleeve 9, the other end of the conducting pin 84 that is not welded is in the pressing direction D (refer to FIG. Figure 10 ) on the cover 2 side, so that the stator 8 moves on the outer peripheral surface of the sleeve 9. In the following description, the end of the conducting pin 84 that becomes the leading end in the pressing direction D when the stator 8 is pressed in (i.e., becomes the cover 2 side) is referred to as the first end of the conducting pin 84.

[0075] like Figure 4 As shown, a through hole 34 is provided on the circuit board 3 for the conducting pin 84 to pass through. When the stator 8 is pressed into the sleeve 9, as shown in FIG. Figure 10 As shown, the conducting pin 84 passes through the through-hole 34 , and the first end 84 a of the conducting pin 84 protrudes from the second surface 3 b of the circuit board 3 on the cover 2 side.

[0076] like Figure 11 As shown, the cover 2 has an opening 24 that exposes the through-hole 34 of the circuit board 3. Therefore, a soldering tool such as a soldering iron can be passed through the opening 24 and contact the first end 84a of the conducting pin 84, thereby soldering the first end 84a of the conducting pin 84 to the second surface 3b (not the main mounting surface) of the circuit board 3. Specifically, in the motor device 1 of this embodiment, since the coil 83 is electrically connected to the circuit board 3 on the second surface 3b rather than the main mounting surface, effective mounting of components and wiring on the first surface 3a, the main mounting surface of the circuit board 3, is possible without compromising the performance.

[0077] In the example of this embodiment, the opening 24 is substantially rectangular, but the shape is not limited thereto and may be appropriately determined according to the shape of the circuit board 3. From the viewpoint of soldering workability, it is preferable to make the opening area of the opening 24 as large as possible.

[0078] Reference Figure 12 , shows the detailed shape of the opening 24 of the cover 2. Figure 12 As shown, the cover 2 has a wall surface 24W extending from the reference surface 2b of the cover 2 toward the second surface 3b of the circuit board 3, thereby forming an opening 24. Figure 10 As shown, the reference surface 2b of the cover 2 is a surface perpendicular to the axial direction and coincides with the end surface of the sleeve 9 on the cover 2 side in the axial direction. Wall surface 24W is formed close to the second surface 3b of the circuit board 3, thereby suppressing the intrusion of foreign matter into the circuit board 3 through the opening 24. The minimum value of the gap between wall surface 24W and the second surface 3b of the circuit board 3 is preferably a value that assumes that even if foreign matter enters the circuit board 3, a short circuit (for example, a short circuit between IC pins) will not occur.

[0079] The wall surface 24W has an inclined surface 241 that inclines toward the inside of the opening 24 as it moves from the reference surface 2b toward the second surface 3b of the circuit board 3. The provision of the inclined surface 241 allows the first end 84a of the conducting pin 84 to be welded using a welding jig from an inclined direction, even without increasing the area of the portion of the second surface 3b of the circuit board 3 exposed through the opening 24, thereby improving welding workability.

[0080] Furthermore, the wall surface 24W includes a vertical surface 242 that extends perpendicularly to the reference surface 2b as it extends from the end of the inclined surface 241 on the second surface 3b side of the circuit board 3 toward the second surface 3b. If the inclined surface 241 were positioned near the second surface 3b of the circuit board 3, the end of the inclined surface 241 near the second surface 3b would form an acute angle in cross-section because the inclined surface 241 tilts inward of the opening 24. This would easily cause burrs to form during molding. In contrast, in this embodiment, the provision of the vertical surface 242 allows the end of the wall surface 24W near the second surface 3b to form a right angle in cross-section, thereby suppressing the generation of burrs during molding.

[0081] (5) Application Examples of the Motor Device 1 of the Present Embodiment

[0082] Next, as an application example of the motor device 1 of the present embodiment described above, refer to Figure 13 A vehicle headlamp on which the motor device 1 according to the present embodiment can be mounted will be outlined. Figure 13 It is a horizontal cross-sectional view of a vehicle headlamp. Figure 13 The vehicle headlamp 10 shown is a left-side headlamp mounted on the left side of the front end of a vehicle. It has the same structure as the right-side headlamp, except that it is bilaterally symmetrical. Therefore, the left-side vehicle headlamp 10 will be described in detail below, and the description of the right-side vehicle headlamp will be omitted.

[0083] like Figure 13 As shown, the vehicle headlamp 10 includes a lamp body 12 having a recessed portion open toward the front. The front opening of the lamp body 12 is covered by a transparent front cover 14 to form a lamp chamber 16. The lamp chamber 16 functions as a space for accommodating a lamp unit 18.

[0084] The lamp unit 18 is a unit that uses ADB (Adaptive Driving Beam) technology using a blade scanning method and is configured to emit a so-called variable high beam. The lamp unit 18 includes an optical unit 20 and a projection lens 27. The optical unit 20 includes a rotating reflector 60 and a light source 26. The projection lens 27 uses, for example, a convex lens. The shape of the convex lens can be appropriately selected based on the required light distribution pattern or illumination distribution, and an aspherical lens or a free-form surface lens can be used. In addition, an extended reflector 23 is provided around the projection lens 27.

[0085] The rotating reflector 60 is configured such that, driven by a motor 30, a blade 60b is rotated in one direction about a rotation axis R, thereby reflecting light emitted from the light source 26 and forming a light distribution pattern by scanning the reflected light. The blade 60b also has an annular reflective region 60a, which is configured to reflect light emitted from the light source 26 while rotating, thereby forming a desired light distribution pattern.

[0086] The blades 60b of the rotating reflector 60 are shaped so that the secondary light source of the reflected light source 26 is formed near the focal point of the projection lens 27. Furthermore, the blades 60b have a twisted shape so that the angle between the optical axis Ax and the reflecting surface changes as it moves in the circumferential direction centered on the rotation axis R. This enables scanning using the light from the light source 26 (light source image).

[0087] The light source 26 is preferably a light source that can be turned on and off in a short time, and is preferably a semiconductor light emitting element such as an LED, LD, or EL element.

[0088] The motor 30 is mounted on a substrate 92. The substrate 92 is mounted and fixed on a mounting surface 94a of a heat sink 94. When the substrate 92 is mounted on the mounting surface 94a, the rotation axis R of the rotating reflector 60 is tilted relative to the optical axis Ax or the vehicle front direction.

[0089] The light source 26 is mounted on a substrate 36. Furthermore, a lens 38 serving as a primary optical system is provided in the light emission direction of the light source 26 and between the light source 26 and the rotating reflector 60. The lens 38 converges the light emitted from the light source 26 so that the light emitted from the light source 26 is directed toward the reflection area 60a of the rotating reflector 60. The substrate 36 is mounted on a heat sink 40. The heat sink 94 and the heat sink 40 are fixed to a metal plate-shaped support member 42. Furthermore, the lamp unit 18 is supported via the support member 42 so that it can be freely tilted relative to the lamp body 12 using an adjustment screw 44 and a nut 46.

[0090] The control circuit 48 is connected to the light source 26 and the motor 30 via the respective substrates, and transmits signals for controlling the light source 26 or the motor 30 and receives signals output from the motor 30 .

[0091] In the vehicle headlamp 10, the rotating reflector 60 corresponds to the rotating body 6 of the motor device 1 of this embodiment, and the motor 30 corresponds to the motor of the motor device 1 of this embodiment. As described above, the motor device 1 of this embodiment can be applied to the vehicle headlamp 10.

[0092] While the embodiments of the motor device of the present invention have been described in detail above, the scope of the present invention is not limited to the above embodiments. In addition, the above embodiments can be variously improved and modified without departing from the spirit of the present invention.

[0093] In the above embodiment, if Figure 8 The figure shows an example in which the protruding regions 811p on the exposed surface of the stator 8 are arranged at equal intervals along the circumference of the inner hole 81h of the stator core 81, but the present invention is not limited to this. The protruding regions 811p do not need to be evenly spaced along the circumference of the inner hole 81h of the stator core 81, and the number is not limited to four. Furthermore, when the protruding regions 811p are arranged at equal intervals along the circumference of the inner hole 81h, they can be arranged at equal intervals along the circumference between adjacent teeth, or they can be arranged at predetermined angular intervals along the circumference regardless of the position of the teeth.

[0094] In the above embodiment, if Figure 7 and Figure 8 8. In the figure, an example is shown in which four cylindrical portions 824B are provided for inserting the conducting pin 84, but the present invention is not limited thereto. The number of cylindrical portions 824B may be three, for example.

[0095] In the above embodiment, the case where the coil 83 is electrically connected to the circuit board 3 via the conductive pin 84 is described as an example, but the present invention is not limited to this. Alternatively, the coil 83 and the circuit board 3 may be electrically connected by inserting the end of the coil 83 into the cylindrical portion 824B of the second insulator 82B and the through-hole 34 of the circuit board 3 and then soldering the end of the coil 83 to the second surface 3b of the circuit board 3.

Claims

1. A motor device comprising: a circuit board having a through hole; a stator disposed opposite to the first surface, which is one surface of the circuit board, and including a stator core and a coil composed of a conducting wire wound around the stator core; and a resin cover disposed opposite to the second surface of the circuit board and covering the second surface of the circuit board; The coil or a conductive member in contact with the coil passes through the through hole and protrudes from the second surface. The cover has: a wall surface covering the second surface of the circuit board; and Two openings are provided on a portion of the wall surface to expose the through hole through which the conductive component protrudes. The cover has a wall surface extending from a reference surface toward the second surface of the circuit board in the opening, the reference surface being a surface opposite to the surface facing the second surface of the circuit board. The wall surface has an inclined surface that inclines toward the inside of the opening as it moves from the reference surface toward the second surface of the circuit board. The inclined surface facilitates soldering of the conductive member.

2. The motor device according to claim 1, wherein The wall surface has a vertical surface that is perpendicular to the reference surface as it moves from one end of the inclined surface toward the second surface of the circuit board.

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