Linear drive device and head-up display device

Abstract

A linear drive device and a head-up display device are disclosed, which can suppress the wobbling of the engaging part of the driven object even when a large external force is applied to it. The linear drive device, used to drive a driven object, includes a movable body that engages with a feed screw shaft and engages with the engaging part of the driven object. The movable body includes a sliding member and a flat leaf spring. The sliding member moves linearly along the axial direction of the feed screw shaft, and the flat leaf spring is held in the sliding member and can elastically deform along the axial direction of the feed screw shaft. The sliding member includes an elastic plate portion capable of elastically deforming along the axial direction of the feed screw shaft. The elastic plate portion includes an elastic plate base and multiple protrusions protruding from the elastic plate base towards the X1 direction side, contacting the engaging part from the X1 direction side and applying force to the engaging part towards the X2 direction side. The leaf spring is disposed on the X1 direction side of the multiple protrusions, and the multiple protrusions contact the leaf spring when the elastic plate portion contacts the engaging part and applies force to the engaging part.

Description

Technical Field

[0001] This invention relates to a linear drive device. Additionally, this invention relates to a head-up display device. Background Technology

[0002] Currently, a drive mechanism used in a head-up display device mounted in a vehicle is known (for example, see Patent Document 1). The drive mechanism described in Patent Document 1 rotates the mirror frame by moving a protruding piece that holds the concave mirror. This drive mechanism includes a lead screw, a drive unit for rotating the lead screw, and a movable member that engages with the lead screw and moves along the axis of the lead screw. The movable member includes a nut unit, a main body that moves integrally with the nut unit along the axis, and a support portion that supports the protruding piece of the mirror frame.

[0003] In the drive device described in Patent Document 1, the support portion includes an elastic support portion that applies force to the protruding piece of the eyeglass frame towards one side in the axial direction, and a fixed support portion that supports the protruding piece that is subjected to force by the elastic support portion. In this drive device, the protruding piece of the eyeglass frame is supported by the elastic support portion in a state of being pressed against the fixed support portion. Therefore, even if the head-up display device vibrates due to vehicle vibration, the swaying of the protruding piece can be suppressed, as well as the swaying of the eyeglass frame and the concave mirror.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent No. 7053201 Summary of the Invention

[0007] The technical problem that the invention aims to solve

[0008] In the driving device described in Patent Document 1, it is preferable that even if a large external force is applied to the protrusion of the frame, the shaking of the protrusion of the frame can be suppressed.

[0009] Therefore, the objective of this invention is to provide a linear drive device comprising a movable body that moves linearly along the axial direction of a feed screw shaft and engages with an engaging portion of a driven object, thereby suppressing wobbling of the engaging portion of the driven object even when a large external force is applied. Furthermore, the objective of this invention is to provide a head-up display device incorporating this linear drive device.

[0010] Technical solutions adopted to solve technical problems

[0011] To address the aforementioned problems, one aspect of the present invention provides a linear drive device for driving a driven object. The device includes a motor and a movable body. The motor has a feed screw shaft. When the movable body engages with the feed screw shaft and the feed screw shaft rotates, it moves linearly along the axial direction of the feed screw shaft and serves as an engagement part for the driven object. The movable body includes a sliding member and a flat leaf spring. The sliding member moves linearly along the axial direction of the feed screw shaft, and the flat leaf spring is held in place by the sliding member and is elastically deformable along the axial direction of the feed screw shaft. When one side of the axial direction of the feed screw shaft is designated as a first direction side, the opposite side, i.e., the axial direction of the feed screw shaft... When the other side is designated as the second direction side, the sliding member has a support portion and an elastic plate portion. The support portion allows the engaging portion to contact from the first direction side. The elastic plate portion is disposed closer to the first direction side than the support portion and is capable of elastic deformation along the axial direction of the feed screw shaft. The elastic plate portion has a flat elastic plate base and a plurality of protrusions. The plurality of protrusions protrude from the elastic plate base toward the first direction side and are arranged in a direction from the root of the elastic plate base toward the front end. The elastic plate portion contacts the engaging portion from the first direction side and applies force to the engaging portion toward the second direction side. A leaf spring is disposed on the first direction side of the plurality of protrusions. The plurality of protrusions contact the leaf spring when the elastic plate portion contacts the engaging portion and applies force to the engaging portion.

[0012] In addition to an elastic plate portion that is a sliding member that contacts the engagement portion of the driven object from a first direction side and applies force to the engagement portion towards a second direction side, the linear drive device of this embodiment also includes a leaf spring disposed on the first direction side of a plurality of protrusions on the elastic plate portion. Furthermore, in this embodiment, when the elastic plate portion contacts the engagement portion and applies force to it, the plurality of protrusions also contact the leaf spring. Therefore, in this embodiment, in addition to the force exerted by the elastic plate portion, the force exerted by the leaf spring can also be applied to the engagement portion of the driven object. Therefore, in this embodiment, even if a large external force is applied to the engagement portion of the driven object, the wobbling of the engagement portion of the driven object can be suppressed.

[0013] Furthermore, in the linear drive device of this method, when the elastic plate contacts the engaging portion and force is applied to the engaging portion, multiple protrusions of the elastic plate contact the leaf spring, thus dispersing the force applied from the elastic plate to the leaf spring. Therefore, in this method, excessive force applied to specific parts of the leaf spring can be prevented, thus preventing excessive deformation of the leaf spring and suppressing damage to the leaf spring.

[0014] The linear drive device of this type can be used, for example, in a head-up display device equipped with a mirror holding member. In this head-up display device, for example, the portion of the engaging part that contacts the support part (the first contact portion) and the portion of the engaging part that contacts the elastic sheet part (the second contact portion) are formed into convex curved surfaces. In this head-up display device, even if a large external force is applied to the engaging part of the driven object, the wobbling of the engaging part of the driven object can be suppressed. In addition, damage to the leaf spring can be suppressed in this head-up display device.

[0015] Invention Effects

[0016] As described above, in one aspect of the present invention, in a linear drive device having a movable body that moves linearly along the axial direction of the feed screw shaft and engages with the engaging part of the driven object, even if a large external force is applied to the engaging part of the driven object, the wobbling of the engaging part of the driven object can be suppressed. Attached Figure Description

[0017] Figure 1 This is a perspective view of a linear drive device according to an embodiment of the present invention.

[0018] Figure 2 It is used for the purpose of use Figure 1 A schematic diagram illustrating the structure of the head-up display device for the linear drive device shown.

[0019] Figure 3 yes Figure 1 The side view of the linear drive device shown.

[0020] Figure 4 yes Figure 1 The diagram shows a three-dimensional view of the sliding component and the leaf spring.

[0021] Figure 5 yes Figure 4 The front view of the sliding component shown.

[0022] Figure 6 yes Figure 4 The front view of the leaf spring is shown.

[0023] Figure 7 yes Figure 4 The sliding component and leaf spring shown are cross-sectional views.

[0024] Figure 8 yes Figure 4 The sliding component and leaf spring shown are cross-sectional views.

[0025] Figure 9 It is used for Figure 1 The diagram illustrates the effect of the linear drive device.

[0026] [Explanation of reference numerals in the attached figures]

[0027] 2: Linear drive device

[0028] 3: HUD device (Head-Up Display)

[0029] 5: Monitor

[0030] 8: Reflector

[0031] 9: Eyeglass frame (lens retaining components, drive mechanism)

[0032] 10: Framework

[0033] 11: Card-shaped section

[0034] 11b: First contact part

[0035] 11c: Second contact part

[0036] 17: Electric motor

[0037] 18: Movable body

[0038] 19b: Feed screw shaft

[0039] 28, 29: Nut components

[0040] 30: Slider (sliding component)

[0041] 30b: Nut retainer

[0042] 30c: Support section

[0043] 30d: Elastic sheet portion

[0044] 30e: Wall

[0045] 30k: Spring mounting hole (first spring mounting hole)

[0046] 30n: Spring mounting hole (second spring mounting hole)

[0047] 30s: Elastic sheet base

[0048] 30t: convex part (first convex part)

[0049] 30u: convex part (second convex part)

[0050] 30V: Anti-displacement protrusion

[0051] 32: Leaf Spring

[0052] 32b: Right end (end of the first leaf spring)

[0053] 32c: Left end (end of the second leaf spring)

[0054] 32f: Central part of the leaf spring

[0055] P1: The amount of protrusion of the first protrusion relative to the elastic plate base.

[0056] P2: The amount of the second protrusion relative to the elastic base portion

[0057] W1: Maximum width of the end of the second leaf spring in the first orthogonal direction

[0058] W2: Maximum width of the central portion of the leaf spring in the first orthogonal direction

[0059] W3: Maximum width of the end of the first leaf spring in the first orthogonal direction

[0060] X: Axial direction of the feed screw shaft

[0061] X1: First direction side

[0062] X2: Second direction side

[0063] Y: Second orthogonal direction

[0064] Z: First orthogonal direction

[0065] Z1: Third Direction Side

[0066] Z2: Fourth direction side Detailed Implementation

[0067] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0068] (Overall structure of the linear drive unit)

[0069] Figure 1 This is a perspective view of the linear drive device 2 according to an embodiment of the present invention. Figure 2 It is used for the purpose of use Figure 1 A schematic diagram illustrating the structure of the head-up display device 3 of the linear drive device 2 shown. Figure 3 yes Figure 1 The side view of the linear drive device 2 shown.

[0070] The linear drive device 2 of this method is used, for example, in a head-up display device 3 (hereinafter referred to as "HUD device 3") installed in the dashboard (instrument panel) of a car. The HUD device 3 projects a virtual image onto the windshield 4 of the car, for example. The HUD device 3 includes a display 5 that emits display light, a mirror unit 6 that reflects the display light emitted from the display 5 toward the windshield 4, and a frame 7 that houses the display 5 and the mirror unit 6.

[0071] The mirror unit 6 includes a reflector 8 that reflects display light emitted from the display 5, a mirror frame 9 that holds the reflector 8 in place, and a frame 10 that holds the mirror frame 9 in a rotatable position. The display 5 is, for example, a liquid crystal display (LCD) that emits display light toward the reflector 8 when the HUD device 3 is used. The reflector 8 is a concave mirror. The mirror frame 9 is rotatable relative to the frame 10 about an axis L parallel to the horizontal direction.

[0072] The linear drive device 2 in this embodiment is used to drive the eyeglass frame 9. Specifically, the linear drive device 2 is used to rotate the eyeglass frame 9 relative to the frame 10. The linear drive device 2 is housed in the frame 7. The eyeglass frame 9 has a locking part 11 that engages with the movable body 18 (described later), which forms part of the linear drive device 2. The locking part 11 is formed in a generally annular shape, and its shape is generally circular when viewed from the direction of the axis L. The eyeglass frame 9 in this embodiment is the object being driven. That is, the HUD device 3 includes the linear drive device 2 and the eyeglass frame 9 as the object being driven.

[0073] In addition to the engaging portion 11, the frame 9 also includes two shaft portions 12 that fix the engaging portion 11 and two shaft fixing portions 13 that fix the shaft portions 12. The engaging portion 11, shaft portions 12, and shaft fixing portions 13 constitute the lower end of the frame 9. The engaging portion 11, shaft portions 12, and shaft fixing portions 13 are positioned lower in the vertical direction than the axis L. The shaft portions 12 are, for example, formed as a column with the axis L as the axial direction. The shaft portions 12 protrude from both sides of the engaging portion 11 in the direction of the axis L. The outer diameter of the shaft portions 12 is smaller than the outer diameter of the engaging portion 11. The outer end of the shaft portion 12 in the direction of the axis L is fixed to the shaft fixing portion 13.

[0074] The linear drive device 2 includes a motor 17 and a movable body 18 that moves linearly by power from the motor 17. The motor 17 is a stepper motor. The motor 17 includes a rotor having a rotating shaft 19 and a drive magnet, and a stator 20 having a drive coil and disposed on the outer periphery of the drive magnet. The output side portion of the rotating shaft 19 protrudes further from the stator 20 towards the output side. The portion of the rotating shaft 19 that protrudes from the stator 20 becomes a feed screw shaft (screw) 19b on its outer peripheral surface. That is, the motor 17 includes a feed screw shaft 19b.

[0075] When the movable body 18 engages with the feed screw shaft 19b and the feed screw shaft 19b rotates, it moves linearly along the axial direction of the feed screw shaft 19b. The engaging part 11 of the frame 9 engages with the movable body 18. When the movable body 18 moves, the frame 9 rotates relative to the frame 10 about the axis L. In addition to the motor 17 and the movable body 18, the linear drive device 2 also has a position detection mechanism 21 for detecting the position of the movable body 18 in the axial direction of the feed screw shaft 19b, and two guide shafts 22 for guiding the movable body 18 axially towards the feed screw shaft 19b.

[0076] In the following description, the axial direction of the rotating shaft 19 (i.e., the axial direction of the feed screw shaft 19b) will be referred to as... Figure 1 The X-direction of the equation is set as the front-back direction, and one side of the front-back direction is... Figure 1 The X1 direction side is designated as the "front" side, and the other side of the front-back direction is designated as the "front" side. Figure 1 The X2 direction side is designated as the "rear" side. Furthermore, for ease of explanation, the direction orthogonal to the front / rear direction will be referred to below. Figure 1 The Y-direction of the equation is set to the left and right directions, and the equation is orthogonal to both the front-back and left-right directions. Figure 1 The Z-direction is set as the up-down direction. Additionally, the left-right direction is... Figure 1 The Y1 direction side is set as the "right" side, and the other side of the left and right directions is... Figure 1 The Y2 direction side is set as the "left" side, and the vertical side is set as the other side. Figure 1 The Z1 direction side is designated as the "up" side, and the other side in the up and down direction is... Figure 4 The Z2 direction side is set as the "down" side.

[0077] In this configuration, the linear drive unit 2 is mounted on the HUD device 3 in a manner parallel to the axis L of the HUD device 3 and the left-right direction (Y direction). Furthermore, the linear drive unit 2 is mounted on the HUD device 3 with its upper side (Z1 direction side) and upper vertical side (the side opposite to where the windshield 4 is positioned) aligned (i.e., its lower side (Z2 direction side) and lower vertical side aligned).

[0078] In this configuration, the front side (X1 direction side) is one side of the axial direction of the feed screw shaft 19b, i.e., the first direction side, and the rear side (X2 direction side) is the other side of the axial direction of the feed screw shaft 19b, i.e., the second direction side. Furthermore, the vertical direction (Z direction) of this configuration is a predetermined direction orthogonal to the axial direction of the feed screw shaft 19b, i.e., the first orthogonal direction. Additionally, the upper side (Z1 direction side) is one side of the first orthogonal direction, i.e., the third direction side, and the lower side (Z2 direction side) is the opposite side of the third direction side, i.e., the fourth direction side. Furthermore, the horizontal direction (Y direction) is a direction orthogonal to both the axial direction of the feed screw shaft 19b and the first orthogonal direction, i.e., the second orthogonal direction.

[0079] The feed screw shaft 19b is positioned forward of the stator 20. In addition to the rotor and stator 20, the motor 17 includes a frame 24 for fixing the stator 20, an output-side bearing 25 supporting the front portion of the rotating shaft 19 (i.e., the output side portion of the feed screw shaft 19b), a reverse output-side bearing supporting the rear portion of the rotating shaft 19, and a leaf spring 26 that contacts the rear end of the rotating shaft 19 and applies force to the rotating shaft 19 forward. The frame 24 is, for example, fixed to the frame 10 of the HUD device 3. The output-side bearing 25 supports the rotating shaft 19 axially (front-to-back direction) and radially. The reverse output-side bearing supports the rotating shaft 19 radially. The leaf spring 26 is fixed to the rear surface of the stator 20.

[0080] The frame 24 includes a flat bottom portion 24b constituting the lower part of the frame 24, a flat side portion 24c rising upward from the front portion of the bottom portion 24b, a flat side portion 24d rising upward from the rear portion of the bottom portion 24b, and a flat fixing portion 24e for the fixed position detection mechanism 21. The thickness direction of the bottom portion 24b and the thickness direction of the fixing portion 24e are aligned with the vertical direction. The thickness directions of the side portions 24c and 24d are aligned with the horizontal direction.

[0081] Side portion 24c rises at a right angle from the front end of bottom portion 24b. Side portion 24d rises at a right angle from the rear end of bottom portion 24b. Fixing portion 24e extends forward from the upper end of side portion 24d. Side portion 24c holds output side bearing 25. The front end face of stator 20 is fixed to side portion 24d. A through hole is formed in side portion 24d for arranging a portion of rotating shaft 19. The front end of guide shaft 22 is fixed to side portion 24c. The rear end of guide shaft 22 is fixed to side portion 24d.

[0082] The movable body 18 is positioned between the side portion 24c and the side portion 24d in the front-rear direction. Additionally, the movable body 18 is positioned on the upper side of the bottom portion 24b. The specific structure of the movable body 18 will be described later. The position detection mechanism 21 is a contact switch. The position detection mechanism 21 is mounted on the upper surface of the fixed portion 24e. The position detection mechanism 21 is positioned rearward of the support portion 30c (described later), which forms part of the movable body 18, and detects the position of the movable body 18 from its rear side. Furthermore, the position detection mechanism 21 detects the origin position of the movable body 18 in the front-rear direction.

[0083] (Structure of a movable body)

[0084] Figure 1 yes Figure 5 The three-dimensional view of the slider 30 and leaf spring 32 shown. Figure 4 yes Figure 6The front view of slider 30 shown. Figure 4 yes Figure 7 The front view of the leaf spring 32 shown. Figure 8 , Figure 4 yes Figure 7 The cross-sectional view of the slider 30 and leaf spring 32 is shown. Furthermore, in Figure 8 , Figure 5 The middle diagram shows the equivalent of Figure 7 The cross section of the E-E section.

[0085] The movable body 18 includes nut components 28 and 29 with a feed screw shaft 19b disposed on its inner circumference, a slider 30 that moves linearly in the front-rear direction together with the nut components 28 and 29 as a sliding component, a compression coil spring 31 for applying force to the nut components 28 and 29, and a flat leaf spring 32 held on the slider 30. The movable body 18 of this embodiment includes two nut components 28 and 29. Furthermore, the movable body 18 of this embodiment is composed of nut components 28 and 29, slider 30, compression coil spring 31, and leaf spring 32.

[0086] Nut components 28 and 29 are formed of resin. Specifically, nut components 28 and 29 are resin molded articles manufactured by resin molding. Nut components 28 and 29 are formed into flanged cylindrical shapes with an axial direction in the front-to-back direction. The inner circumferential side of nut components 28 and 29 forms threaded holes that engage with the feed screw shaft 19b. Nut components 28 and 29 are arranged at a distance from each other in the front-to-back direction. Nut component 28 is disposed on the front side of nut component 29. A flange portion 28b extending radially outward is formed at the front end of nut component 28. A flange portion 29b extending radially outward is formed at the rear end of nut component 29.

[0087] The slider 30 is formed of resin. Specifically, the slider 30 is a resin molded article manufactured by resin molding. The slider 30 includes a nut retaining portion 30b for retaining nut members 28 and 29, a support portion 30c that contacts the engagement portion 11 of the frame 9 from the front, and a plate-shaped elastic sheet portion 30d that can elastically deform in the front-rear direction. The elastic sheet portion 30d is disposed in front of the support portion 30c. The elastic sheet portion 30d contacts the engagement portion 11 from the front and applies force to the engagement portion 11 toward the rear. That is, the elastic sheet portion 30d contacts the engagement portion 11 from the front and applies force to the engagement portion 11 toward the support portion 30c.

[0088] Furthermore, the slider 30 includes two wall portions 30e disposed on both sides of the elastic plate portion 30d in the left-right direction, and a connecting portion 30f connecting the two wall portions 30e. The slider 30 of this type is composed of a nut retaining portion 30b, a support portion 30c, an elastic plate portion 30d, wall portions 30e, and a connecting portion 30f. As described above, the slider 30 is a resin molded product, in which the nut retaining portion 30b, support portion 30c, elastic plate portion 30d, wall portions 30e, and connecting portion 30f are integrally formed.

[0089] The nut retaining portion 30b forms the lower end of the slider 30. A guide hole 30g is formed in the nut retaining portion 30b for arranging a portion of the guide shaft 22. In addition, a nut mounting recess 30h is formed in the nut retaining portion 30b for arranging nut members 28 and 29. A wall portion 30j is formed in the nut mounting recess 30h that contacts the rear surface of the flange portion 28b of the nut member 28.

[0090] The cylindrical portions of nut components 28 and 29 are disposed on the inner circumferential side of the compression coil spring 31. The front end of the compression coil spring 31 contacts the rear surface of the wall portion 30j. The rear end of the compression coil spring 31 contacts the front surface of the flange portion 29b of the nut component 29. The compression coil spring 31 applies a force to the nut component 29 relative to the slider 30 towards the rear. In addition, due to the force of the compression coil spring 31, the front surface of the wall portion 30j contacts the rear surface of the flange portion 28b of the nut component 28 with a predetermined contact pressure.

[0091] The support portion 30c rises upward from the nut retaining portion 30b and is connected to it. That is, the lower end of the support portion 30c is connected to the upper end of the nut retaining portion 30b. The support portion 30c rises upward from the rear portion of the nut retaining portion 30b. The support portion 30c is formed as a rectangular flat plate with the front-to-back direction as its thickness direction. The direction of the long side of the rectangular flat plate support portion 30c is consistent with the vertical direction.

[0092] The support portion 30c is relatively thick. Specifically, the thickness of the support portion 30c is set such that it hardly deforms elastically even when pressed against the engaging portion 11 from the front. The front and rear surfaces of the support portion 30c are planes orthogonal to the front-rear direction. The front surface of the support portion 30c becomes the contact surface that contacts the engaging portion 11. The rear surface of the support portion 30c becomes the contact surface that the contact portion of the position detection mechanism 21 can contact.

[0093] The wall portion 30e rises upward from the nut retaining portion 30b and is connected to it. That is, the lower end of the wall portion 30e is connected to the upper end of the nut retaining portion 30b. The wall portion 30e rises upward from the front portion of the nut retaining portion 30b. The wall portion 30e is formed in a quadrangular prism shape. The side surface of the wall portion 30e is a plane orthogonal to the front-back direction or the left-right direction.

[0094] The right surface of the wall portion 30e located on the right side is positioned in the same horizontal direction as the right end face of the support portion 30c, and the left surface of the wall portion 30e located on the left side is positioned in the same horizontal direction as the left end face of the support portion 30c. A connecting portion 30f connects the upper ends of the two wall portions 30e to each other. The connecting portion 30f is formed in the shape of a quadrangular prism. The height of the wall portion 30e is greater than the height of the support portion 30c, and the connecting portion 30f is positioned higher than the upper end of the support portion 30c.

[0095] A spring mounting hole 30k, 30n is formed on the wall portion 30e at the left and right ends of the leaf spring 32, a spring mounting recess 30p adjacent to the spring mounting hole 30k, and a spring mounting recess 30r adjacent to the spring mounting hole 30n. The spring mounting hole 30k and the spring mounting recess 30p are formed on the wall portion 30e on the right side. The spring mounting hole 30n and the spring mounting recess 30r are formed on the wall portion 30e on the left side. The spring mounting holes 30k, 30n and the spring mounting recesses 30p, 30r are formed on the lower part of the wall portion 30e. In this embodiment, the spring mounting hole 30k is a first spring mounting hole, and the spring mounting hole 30n is a second spring mounting hole.

[0096] Spring mounting recesses 30p and 30r are recessed from the front surface of the wall portion 30e toward the rear. Spring mounting recess 30p is formed from the left surface of the wall portion 30e located on the right side to a position midway along the left-right direction. Spring mounting recess 30r is formed from the right surface of the wall portion 30e located on the left side to a position midway along the left-right direction. The rear surfaces of spring mounting recesses 30p and 30r are planes orthogonal to the front-rear direction. The rear surfaces of spring mounting recesses 30p and 30r are positioned at the same location in the front-rear direction.

[0097] The upper and lower surfaces of the spring mounting recesses 30p and 30r form planes orthogonal to the front-back direction. The upper surfaces of the spring mounting recesses 30p and 30r are positioned at the same location in the vertical direction. The lower surfaces of the spring mounting recesses 30p and 30r are positioned at the same location in the vertical direction. The right surface of the spring mounting recess 30p and the left surface of the spring mounting recess 30r form planes orthogonal to the left-right direction.

[0098] A spring mounting hole 30k is formed on the right side of the spring mounting recess 30p. The spring mounting hole 30k is a through hole extending from the right surface of the wall portion 30e on the right side to the spring mounting recess 30p. A spring mounting hole 30n is formed on the left side of the spring mounting recess 30r. The spring mounting hole 30n is a through hole extending from the left surface of the wall portion 30e on the left side to the spring mounting recess 30r. When viewed from the left-right direction, the spring mounting holes 30k and 30n are elongated rectangular shapes with the vertical direction as their longer side. The width of the spring mounting holes 30k and 30n in the front-back direction is wider than the thickness of the leaf spring 32.

[0099] The rear surfaces of the spring mounting holes 30k and 30n are positioned in the front-to-back direction at the same positions as the rear surfaces of the spring mounting recesses 30p and 30r. The upper surfaces of the spring mounting holes 30k and 30p are positioned in the vertical direction, and the lower surfaces of the spring mounting holes 30k and 30p are positioned in the vertical direction. However, the upper surface of the spring mounting hole 30n is positioned lower than the upper surface of the spring mounting recess 30r, and the lower surface of the spring mounting hole 30n is positioned higher than the lower surface of the spring mounting recess 30r. That is, the vertical width of the spring mounting hole 30k is wider than the vertical width of the spring mounting hole 30n. The vertical centers of the spring mounting holes 30k and 30n are positioned in the vertical direction at the same positions.

[0100] The leaf spring 32 is formed from a metal plate such as a steel plate. The leaf spring 32 is arranged such that its thickness direction and front-to-back direction are aligned, allowing it to elastically deform in the front-to-back direction. As described above, the left and right ends of the leaf spring 32 are positioned in spring mounting holes 30k and 30n. Specifically, the right end 32b of the leaf spring 32 is positioned in the spring mounting hole 30k, and the left end 32c of the leaf spring 32 is positioned in the spring mounting hole 30n. In this configuration, the right end 32b is the first leaf spring end, and the left end 32c is the second leaf spring end.

[0101] The right end portion 32b is composed of a wide portion 32d with a constant width in the vertical direction and a narrow portion 32e with a constant width in the vertical direction. The width of the wide portion 32d in the vertical direction is wider than that of the narrow portion 32e in the vertical direction. The width of the left end portion 32c in the vertical direction is constant. The width of the left end portion 32c in the vertical direction is equal to that of the narrow portion 32e in the vertical direction. When the portion of the leaf spring 32 disposed between the two wall portions 30e is designated as the central portion 32f of the leaf spring, the shape of the central portion 32f of the leaf spring when viewed from the front-rear direction is rhomboid.

[0102] The maximum vertical width of the left end 32c (i.e., the vertical width of the left end 32c) W1 is narrower than the maximum vertical width of the central portion 32f of the leaf spring (i.e., the vertical width of the center portion of the central portion 32f in the left-right direction) W2. The maximum vertical width of the right end 32b (i.e., the vertical width of the wide portion 32d) W3 is greater than the maximum vertical width W2 of the central portion 32f of the leaf spring. In this embodiment, the maximum width W3 and the maximum width W2 are equal. Furthermore, the vertical width of the spring mounting hole 30k is wider than the maximum width W2. In this embodiment, the vertical width of the spring mounting hole 30k is slightly wider than the maximum width W2.

[0103] The elastic sheet portion 30d extends downward from the connecting portion 30f and is connected to the connecting portion 30f. Specifically, the upper end of the elastic sheet portion 30d is connected to the connecting portion 30f. More specifically, the upper end of the elastic sheet portion 30d is connected to the center portion of the connecting portion 30f in the left-right direction. Additionally, the upper end of the elastic sheet portion 30d is connected to the rear portion of the connecting portion 30f. The thickness (thickness in the front-rear direction) of the elastic sheet portion 30d is thinner than the width of the wall portion 30e in the front-rear direction. As described above, the elastic sheet portion 30d is positioned forward of the support portion 30c. The support portion 30c and the elastic sheet portion 30d are arranged opposite each other in the front-rear direction at a predetermined interval.

[0104] The elastic plate portion 30d includes a flat elastic plate base portion 30s, a plurality of protrusions 30t and 30u protruding from the elastic plate base portion 30s, and anti-deviation protrusions 30v that contact the end face of the leaf spring 32 to prevent the leaf spring 32 from deviating relative to the elastic plate base portion 30s. The elastic plate portion 30d of this embodiment has two protrusions 30t and 30u and four anti-deviation protrusions 30v. The elastic plate portion 30d of this embodiment is composed of the elastic plate base portion 30s, two protrusions 30t and 30u, and four anti-deviation protrusions 30v.

[0105] The elastic sheet base portion 30s extends downward from the connecting portion 30f, and the upper end of the elastic sheet base portion 30s is connected to the connecting portion 30f. That is, the upper end of the elastic sheet base portion 30s becomes the root of the elastic sheet base portion 30s, and the lower end of the elastic sheet base portion 30s becomes the front end of the elastic sheet base portion 30s. In other words, the upper end portion of the elastic sheet base portion 30s becomes the end portion on the root side of the elastic sheet base portion 30s, and the lower end portion of the elastic sheet base portion 30s becomes the end portion on the front end side of the elastic sheet base portion 30s.

[0106] When the engaging portion 11 is not engaged with the movable body 18, the elastic plate base 30s tilts towards the rear as it moves downward (see reference). Figure 8That is, when no external force is applied to the elastic sheet portion 30d, the elastic sheet base portion 30s tilts towards the rearward side as it moves downward. Specifically, when no external force is applied to the elastic sheet portion 30d, the elastic sheet base portion 30s tilts slightly towards the rearward side as it moves downward. Furthermore, when the engaging portion 11 is engaged with the movable body 18, the thickness direction of the elastic sheet base portion 30s is approximately aligned with the front-rear direction (see reference). Figure 7 ).

[0107] The elastic sheet base 30s has protrusions 30w that project outwards in the left-right direction. The elastic sheet base 30s of this embodiment has four protrusions 30w. Two of the four protrusions 30w project outwards in the left-right direction from the lower end of the elastic sheet base 30s, respectively. The remaining two protrusions 30w project outwards in the left-right direction from the middle portion of the elastic sheet base 30s in the vertical direction, respectively. The width of the portion of the elastic sheet base 30s excluding the protrusions 30w gradually increases towards the lower side. When viewed from the front-rear direction, the shape of the portion of the elastic sheet base 30s excluding the protrusions 30w is trapezoidal.

[0108] Protrusions 30t and 30u are formed on the front surface of the elastic sheet base 30s. Protrusions 30t and 30u protrude forward from the elastic sheet base 30s. Protrusions 30t and 30u are arranged in the direction from the root of the elastic sheet base 30s toward the front end (i.e., the vertical direction) and are adjacent in the vertical direction. In this embodiment, protrusion 30t is disposed on the lower side, and protrusion 30u is disposed on the upper side. That is, protrusion 30t is disposed on the front end side of the elastic sheet base 30s closer to the protrusion 30u than protrusion 30u. Protrusions 30t and 30u are formed on the lower portion of the elastic sheet base 30s. Protrusions 30t and 30u are disposed at the same position in the left-right direction. Protrusions 30t and 30u are disposed at the center in the left-right direction of the elastic sheet base 30s. The front end face (front end face) of protrusions 30t and 30u is spherical. In this method, the convex part 30t is the first convex part, and the convex part 30u is the second convex part.

[0109] The amount of protrusion of the convex portion 30t relative to the elastic base portion 30s (specifically, the amount of protrusion of the convex portion 30t relative to the front surface of the elastic base portion 30s) P1 is smaller than the amount of protrusion of the convex portion 30u relative to the elastic base portion 30s (specifically, the amount of protrusion of the convex portion 30u relative to the front surface of the elastic base portion 30s) P2 (refer to...). Figure 7That is, the protrusions P1 and P2 of the two protrusions 30t and 30u relative to the elastic plate base 30s gradually decrease from the root side of the elastic plate base 30s toward the front end side. The leaf spring 32 is disposed on the front side of the protrusions 30t and 30u. Specifically, the leaf spring 32 is disposed on the front side of the lower portion of the elastic plate base 30s. More specifically, the central portion 32f of the leaf spring is disposed on the front side of the protrusions 30t and 30u.

[0110] Anti-deviation protrusion 30v is formed on the front surface of the elastic sheet base 30s. The anti-deviation protrusion 30v protrudes forward from the elastic sheet base 30s. The anti-deviation protrusion 30v protrudes forward of the protrusions 30t and 30u. The anti-deviation protrusion 30v is formed in the protrusion 30w. The anti-deviation protrusion 30v is positioned to contact the end face of the leaf spring 32. Specifically, four anti-deviation protrusions 30v are respectively positioned to contact the four sides of the central portion 32f of the rhomboid leaf spring.

[0111] The anti-deviation protrusion 30v is formed in the shape of a triangular prism. When viewed from the front-rear direction, the shape of the anti-deviation protrusion 30v is a right-angled triangle. The hypotenuse of the right-angled triangle anti-deviation protrusion 30v can contact the end face of the central portion 32f of the leaf spring. The anti-deviation protrusion 30v performs the function of preventing the leaf spring 32 from deviating relative to the elastic plate base portion 30s in a direction orthogonal to the thickness direction of the leaf spring 32 (i.e., in a direction orthogonal to the front-rear direction).

[0112] As described above, the linear drive device 2 is mounted on the HUD device 3 in a manner parallel to the axis L of the HUD device 3 in the left-right direction (Y direction) and aligned with the upper side (Z1 direction side) and the upper side in the vertical direction. The engaging portion 11 is disposed from above between the support portion 30c and the elastic plate portion 30d and engages with the movable body 18. When the engaging portion 11 is disposed between the support portion 30c and the elastic plate portion 30d, the engaging portion 11 is disposed between the two wall portions 30e in the left-right direction. Furthermore, when the engaging portion 11 is disposed between the support portion 30c and the elastic plate portion 30d, the shaft portion 12 is disposed between the support portion 30c and the wall portion 30e, and the shaft fixing portion 13 is disposed on the outside of the slider 30 in the left-right direction.

[0113] like Figure 8 As shown, when the movable body 18 is not engaged with the engaging part 11, only the protrusion 30u contacts the leaf spring 32. Figure 8As shown, when the engaging portion 11 is disposed between the support portion 30c and the elastic plate portion 30d and the engaging portion 11 engages with the movable body 18, the lower end of the elastic plate base portion 30s contacts the engaging portion 11 from the front and flexes towards the front, applying force to the engaging portion 11 towards the rear. When the engaging portion 11 engages with the movable body 18 (i.e., when the elastic plate portion 30d contacts the engaging portion 11 and applies force to the engaging portion 11), both protrusions 30t and 30u contact the leaf spring 32. At this time, the leaf spring 32 applies force to the engaging portion 11 towards the rear via the elastic plate portion 30d.

[0114] In either the state where the engaging part 11 is not engaged with the movable body 18, or the state where the engaging part 11 is engaged with the movable body 18, the right end 32b of the leaf spring 32 contacts the front surface of the spring mounting hole 30k, and the left end 32c contacts the front surface of the spring mounting hole 30n. The leaf spring 32 is held by two wall portions 30e and an elastic plate portion 30d. When mounting the leaf spring 32 on the slider 30, with the elastic plate portion 30d slightly bent rearward, the leaf spring 32 is inserted into the spring mounting holes 30k and 30n from the right side of the slider 30.

[0115] As described above, the frame 9 can rotate relative to the frame 10 about the axis L. Therefore, the contact points of the engaging portion 11 with the support portion 30c and with the elastic piece portion 30d change slightly as the frame 9 rotates about the axis L. That is, a predetermined portion on the rear side of the engaging portion 11 contacts the support portion 30c. In addition, a predetermined portion on the front side of the engaging portion 11 contacts the elastic piece portion 30d.

[0116] As described above, the engaging portion 11 is formed in a generally annular shape, and its shape is generally circular when viewed from the direction of the axis L. Therefore, the portion of the engaging portion 11 that contacts the support portion 30c is the first contact portion 11b (see reference). Figure 8 ), and the portion of the engaging portion 11 that contacts the elastic sheet portion 30d, namely the second contact portion 11c (see reference). Figure 9 The first contact portion 11b and the second contact portion 11c are formed into a convex curved surface. That is, when viewed from the left and right, the shapes of the first contact portion 11b and the second contact portion 11c are convex curves. Specifically, when viewed from the left and right, the shapes of the first contact portion 11b and the second contact portion 11c are arc-shaped.

[0117] (The main effects of this method)

[0118] As explained above, in this embodiment, the linear drive device 2, in addition to having an elastic plate portion 30d that contacts the engaging portion 11 from the front and applies force to the engaging portion 11 towards the rear, also has a leaf spring 32 disposed on the front side of the protrusions 30t and 30u of the elastic plate portion 30d. Furthermore, in this embodiment, when the elastic plate portion 30d contacts the engaging portion 11 and applies force to it, the protrusions 30t and 30u contact the leaf spring 32. Therefore, in this embodiment, in addition to the force exerted by the elastic plate portion 30d, the force exerted by the leaf spring 32 can also be applied to the engaging portion 11.

[0119] Therefore, in this method, even if a large external force is applied to the frame 9 and the locking part 11, the wobbling of the locking part 11 can be suppressed. In particular, in this method, because a leaf spring 32 is disposed on the front side of the lower portion of the elastic sheet portion 30d extending downward from the connecting portion 30f, the wobbling of the locking part 11 can be suppressed even if a larger external force is applied to the locking part 11.

[0120] In this configuration, when the elastic plate portion 30d contacts the engaging portion 11 and applies force to the engaging portion 11, the two protrusions 30t and 30u contact the leaf spring 32. Therefore, in this configuration, the force applied to the leaf spring 32 from the elastic plate portion 30d can be dispersed. Therefore, in this configuration, excessive force applied to specific parts of the leaf spring 32 and excessive deformation of the leaf spring 32 can be prevented, and as a result, damage to the leaf spring 32 can be suppressed.

[0121] In this configuration, the protrusion P1 of the protrusion 30t, which is located at the front end of the elastic plate base 30s, is smaller than the protrusion P2 of the protrusion 30u relative to the elastic plate base 30s. Therefore, in this configuration, for example, even if the dimensions of the engaging portions 11 are inconsistent and the outer diameter of the engaging portions 11 increases, when the elastic plate portion 30d, which contacts the engaging portions 11 from the front and applies force to the engaging portions 11 rearward, undergoes elastic deformation towards the front, excessive deformation of the portion of the leaf spring 32 that contacts the protrusion 30t can be prevented. Therefore, in this configuration, for example, even if the dimensions of the engaging portions 11 are inconsistent and the outer diameter of the engaging portions 11 increases, damage to the leaf spring 32 can be suppressed.

[0122] Furthermore, for example, when the protrusion P1 of the protrusion 30t relative to the elastic sheet base 30s is equal to the protrusion P2 of the protrusion 30u relative to the elastic sheet base 30s (refer to...) ​ (The double-dotted line), for example, if the size of the engaging part 11 is inconsistent and the outer diameter of the engaging part 11 becomes larger, when the elastic plate part 30d that applies force to the engaging part 11 to the rearward side undergoes elastic deformation to the frontward side, the part of the leaf spring 32 that contacts the protrusion 30t may be excessively deformed.

[0123] In this configuration, the base portion 30s of the elastic sheet is tilted toward the rear as it moves downward when the engaging portion 11 is not engaged with the movable body 18. Therefore, in this configuration, it is easy to position the engaging portion 11 from above between the support portion 30c and the elastic sheet portion 30d.

[0124] In this embodiment, the elastic plate portion 30d is integrally formed with the nut retaining portion 30b and the support portion 30c. Therefore, compared to the case where the elastic plate portion 30d, nut retaining portion 30b, and support portion 30c are formed separately, the number of parts in the linear drive device 2 can be reduced, thus lowering the cost of the parts constituting the linear drive device 2. Furthermore, in this embodiment, because the leaf spring 32 is formed in a flat plate shape, the cost of the leaf spring 32 can be suppressed. Therefore, even if the linear drive device 2 includes the leaf spring 32, the cost of the parts constituting the linear drive device 2 can still be reduced.

[0125] In this embodiment, the elastic plate portion 30d has an anti-deviation protrusion 30v, which contacts the end face of the leaf spring 32 and prevents the leaf spring 32 from deviating relative to the elastic plate base portion 30s in a direction orthogonal to the thickness direction of the leaf spring 32. Therefore, in this embodiment, even if the width of the spring mounting holes 30k and 30n at the right end portion 32b and left end portion 32c of the leaf spring 32 in the front-rear direction is wider than the thickness of the leaf spring 32, deviation of the leaf spring 32 relative to the elastic plate base portion 30s can still be prevented. Therefore, in this embodiment, the right end portion 32b and the left end portion 32c can be restrained by the wall portion 30e, and deviation of the leaf spring 32 relative to the elastic plate base portion 30s can be prevented. That is, in this embodiment, deviation of the leaf spring 32 relative to the elastic plate base portion 30s can be prevented, and the leaf spring 32 can be easily elastically deformed, thereby effectively suppressing damage to the leaf spring 32.

[0126] In this configuration, the central portion 32f of the leaf spring, when viewed from the front-rear direction, has a rhomboid shape. Therefore, in this configuration, when the leaf spring 32 undergoes elastic deformation, stress concentration in a specific part of the central portion 32f can be suppressed. Thus, in this configuration, damage to the leaf spring 32 can be effectively suppressed.

[0127] In this configuration, the maximum vertical width W1 of the left end portion 32c of the leaf spring 32 is narrower than the maximum vertical width W2 of the central portion 32f of the leaf spring, and the vertical width of the spring mounting hole 30k is wider than the maximum vertical width W2 of the central portion 32f of the leaf spring. Therefore, in this configuration, as described above, the leaf spring 32 can be inserted into the spring mounting holes 30k and 30n from the right side of the slider 30, and the leaf spring 32 can be mounted on the slider 30. Therefore, in this configuration, the leaf spring 32 can be easily mounted on the slider 30.

[0128] Furthermore, in this method, because the vertical width of the spring mounting hole 30n at the left end 32c can be narrowed, the strength of the wall portion 30e on the left side of the spring mounting hole 30n can be ensured. Additionally, in this method, because the maximum vertical width W3 of the right end 32b of the leaf spring 32 is greater than or equal to the maximum width W2, the maximum width W3 can be widened. Therefore, in this method, the vertical swaying of the right end 32b within the spring mounting hole 30k can be suppressed.

[0129] In this configuration, the first contact portion 11b of the engaging portion 11 that contacts the support portion 30c and the second contact portion 11c of the engaging portion 11 that contacts the elastic sheet portion 30d are formed into convex curved surfaces. Therefore, in this configuration, even if the movable body 18 moves in the front-rear direction and the frame 9 rotates relative to the frame 10 about the axis L, the engaging portion 11 and the support portion 30c can maintain smooth and continuous contact, and the engaging portion 11 and the elastic sheet portion 30d can maintain smooth and continuous contact.

[0130] (Other implementation methods)

[0131] The above-described method is an example of a preferred embodiment of the present invention, but it is not limited thereto, and various modifications can be made within the scope of the present invention without changing its spirit.

[0132] In the above-described manner, the protrusion P1 of the protrusion 30t relative to the elastic plate base 30s and the protrusion P2 of the protrusion 30u relative to the elastic plate base 30s can also be equal. Furthermore, in the above-described manner, the elastic plate portion 30d may also have three or more protrusions protruding forward from the elastic plate base 30s. In this case, the three or more protrusions are arranged in a vertical direction. Even in this case, when the engaging portion 11 engages with the movable body 18, all three or more protrusions are in contact with the leaf spring 32. Additionally, in this case, for example, the protrusion of the three or more protrusions relative to the elastic plate base 30s gradually decreases from the protrusion disposed at the uppermost side of the elastic plate base 30s toward the protrusion disposed at the lowermost side.

[0133] In the above-described manner, the elastic plate portion 30d can also stand upright from the nut retaining portion 30b towards the upward side. That is, the elastic plate base portion 30s can also stand upright from the nut retaining portion 30b towards the upward side. In this case, the protrusions 30t and 30u are formed on the upper portion of the elastic plate base portion 30s. Furthermore, in this case, for example, the protrusion P2 of the upper protrusion 30u relative to the elastic plate base portion 30s is smaller than the protrusion P1 of the lower protrusion 30t relative to the elastic plate base portion 30s. Additionally, in this case, the slider 30 may not have the connecting portion 30f.

[0134] In the above-described manner, the elastic plate portion 30d may also be formed separately from the nut retaining portion 30b and the support portion 30c. In this case, for example, the elastic plate portion 30d is formed of metal, and the upper end of the elastic plate portion 30d is embedded into the connecting portion 30f by insert forming. In this case, for example, protrusions 30t and 30u are formed on the elastic plate base portion 30s by deep drawing. In addition, in the above-described manner, the maximum vertical width W3 of the right end portion 32b of the leaf spring 32 may be narrower than the maximum vertical width W2 of the central portion 32f of the leaf spring. In addition, in the above-described manner, the elastic plate portion 30d may not have the anti-deviation protrusion 30v.

[0135] In the above-described manner, the position detection mechanism 21 may also be positioned forward of the movable body 18. In this case, for example, the elastic plate portion 30d may also be positioned rearward of the support portion 30c. When the elastic plate portion 30d is positioned rearward of the support portion 30c, the rear side (X2 direction side) becomes one side of the axial direction of the feed screw shaft 19b, i.e., the first direction side, and the front side (X1 direction side) becomes the other side of the axial direction of the feed screw shaft 19b, i.e., the second direction side.

[0136] In the above-described manner, a portion of the rotating shaft 19 becomes the feed screw shaft 19b, but the feed screw shaft 19b, which is separate from the rotating shaft 19, can also be fixed to the rotating shaft 19. Furthermore, in the above-described manner, the motor 17 can be a motor other than a stepper motor. Moreover, in the above-described manner, the linear drive device 2 can also be mounted on a device other than the HUD device 3. That is, the object driven by the linear drive device 2 can also be an object other than the eyeglass frame 9.

[0137] In the above-described manner, only the first contact portion 11b and the second contact portion 11c of the engaging portion 11 may be formed as convex curved surfaces. Furthermore, in the above-described manner, the engaging portion 11 may be formed as a sphere, a cylinder with the axis L as its axial direction, or a circular plate with the axis L as its thickness direction. Even in this case, the first contact portion 11b and the second contact portion 11c are formed as curved surfaces, and the shapes of the first contact portion 11b and the second contact portion 11c when viewed from the left and right directions are both convex curves.

[0138] (Structure of this technology)

[0139] Furthermore, this technology can adopt the following structure.

[0140] (1) A linear drive device for driving a driven object, wherein,

[0141] It includes an electric motor and a movable body. The electric motor has a feed screw shaft. When the movable body is engaged with the feed screw shaft and the feed screw shaft rotates, it moves linearly along the axial direction of the feed screw shaft and is engaged by the engaging part of the driven object.

[0142] The movable body includes a sliding component and a flat leaf spring. The sliding component moves linearly along the axial direction of the feed screw shaft, and the flat leaf spring is held in place by the sliding component and is capable of elastic deformation along the axial direction of the feed screw shaft.

[0143] When one side of the axial direction of the feed screw shaft is designated as the first direction side, and the opposite side of the first direction side, i.e., the other side of the axial direction of the feed screw shaft, is designated as the second direction side,

[0144] The sliding component includes a support portion and an elastic plate portion. The support portion allows the engaging portion to contact the component from the first direction side. The elastic plate portion is disposed closer to the first direction side than the support portion and is capable of elastic deformation along the axial direction of the feed screw shaft.

[0145] The elastic sheet portion has a flat elastic sheet base and a plurality of protrusions. The plurality of protrusions protrude from the elastic sheet base toward the first direction side and are arranged in a direction from the root of the elastic sheet base toward the front end. The elastic sheet portion contacts the engaging portion from the first direction side and applies force to the engaging portion toward the second direction side.

[0146] The leaf spring is disposed on the first direction side of the plurality of protrusions.

[0147] The plurality of protrusions contact the leaf spring when the elastic plate portion contacts the engaging portion and applies force to the engaging portion.

[0148] (2) The linear drive device according to (1), wherein,

[0149] When one of two adjacent protrusions in the direction from the root of the elastic sheet base toward the front end is designated as the first protrusion, and the other protrusion is designated as the second protrusion...

[0150] The first protrusion is disposed on the front end side of the elastic sheet base, which is closer to the second protrusion.

[0151] The amount by which the first protrusion protrudes relative to the elastic sheet base is smaller than the amount by which the second protrusion protrudes relative to the elastic sheet base.

[0152] (3) The linear drive device according to (2), wherein,

[0153] The elastic sheet portion has two protrusions.

[0154] (4) The linear drive device according to any one of (1) to (3), wherein,

[0155] When a predetermined direction orthogonal to the axial direction of the feed screw shaft is defined as the first orthogonal direction, one side of the first orthogonal direction is defined as the third direction side, and the opposite side of the third direction side is defined as the fourth direction side,

[0156] The third-direction end of the elastic sheet base becomes the root-side end of the elastic sheet base.

[0157] The base of the elastic sheet tilts toward the second direction side as it moves toward the fourth direction side when the engaging portion is not engaged with the movable body.

[0158] (5) The linear drive device according to any one of (1) to (4), wherein,

[0159] The movable body includes a nut component, on which the feed screw shaft is disposed on its inner circumference, and moves axially along the feed screw shaft together with the sliding component.

[0160] The sliding member has a nut retaining portion for retaining the nut member, and is formed of resin.

[0161] In the sliding component, the support portion, the elastic plate portion, and the nut retaining portion are integrally formed.

[0162] (6) The linear drive device according to any one of (1) to (5), wherein,

[0163] When a predetermined direction orthogonal to the axial direction of the feed screw shaft is defined as the first orthogonal direction, and a direction orthogonal to both the axial direction of the feed screw shaft and the first orthogonal direction is defined as the second orthogonal direction,

[0164] The end of the elastic sheet base on one side of the first orthogonal direction becomes the root side end of the elastic sheet base.

[0165] The sliding member has wall portions disposed on both sides of the elastic sheet portion in the second orthogonal direction.

[0166] A spring mounting hole is formed in the wall portion for arranging the end of the leaf spring in the second orthogonal direction.

[0167] The elastic sheet portion has an anti-deviation protrusion that contacts the end face of the leaf spring, and is used to prevent the leaf spring from deviating relative to the base of the elastic sheet in a direction orthogonal to the thickness direction of the leaf spring.

[0168] The anti-deviation protrusion extends from the base of the elastic sheet toward the first direction side.

[0169] (7) The linear drive device according to (6), wherein,

[0170] When the portion of the leaf spring positioned between the two wall portions is designated as the central portion of the leaf spring...

[0171] The shape of the central portion of the leaf spring when viewed axially from the feed screw shaft is rhomboid.

[0172] (8) The linear drive device according to (7), wherein,

[0173] When the spring mounting hole formed in one of the two wall portions is designated as the first spring mounting hole, and the spring mounting hole formed in the other wall portion is designated as the second spring mounting hole, the end of the leaf spring disposed in the first spring mounting hole is designated as the first leaf spring end, and the end of the leaf spring disposed in the second spring mounting hole is designated as the second leaf spring end,

[0174] The width of the first spring mounting hole in the first orthogonal direction is wider than the width of the second spring mounting hole in the first orthogonal direction, and also wider than the maximum width of the central portion of the leaf spring in the first orthogonal direction.

[0175] The maximum width of the end of the second leaf spring in the first orthogonal direction is narrower than the maximum width of the central portion of the leaf spring in the first orthogonal direction.

[0176] The maximum width of the end of the first leaf spring in the first orthogonal direction is greater than or equal to the maximum width of the central portion of the leaf spring in the first orthogonal direction.

[0177] (9) The linear drive device according to any one of (1) to (8), wherein,

[0178] The driving object is a mirror holding component used in a head-up display device that includes a reflector and a display that emits display light toward the reflector. The mirror holding component fixes the reflector and is rotatably held on the frame of the head-up display device.

[0179] (10) A head-up display device, wherein,

[0180] Equipped with the linear drive device described in (9) and the mirror holding component,

[0181] The portion of the engaging part that contacts the support part, namely the first contact portion, and the portion of the engaging part that contacts the elastic sheet part, namely the second contact portion, are formed into a convex curved surface.

[0182] In this technology, it is preferable that when one of two adjacent protrusions in the direction from the root of the elastic sheet base toward the front end is designated as the first protrusion and the other protrusion is designated as the second protrusion, the first protrusion is positioned closer to the front end of the elastic sheet base than the second protrusion, and the amount of protrusion of the first protrusion relative to the elastic sheet base is smaller than the amount of protrusion of the second protrusion relative to the elastic sheet base. In this case, for example, the elastic sheet portion has two protrusions.

[0183] When configured in this way, for example, even if the dimensions of the engaging portions are inconsistent and the shape of the engaging portions becomes larger, when the elastic plate portion, which contacts the engaging portion from the first direction side and applies force to the engaging portion towards the second direction side, undergoes elastic deformation towards the first direction side, excessive deformation of the portion of the leaf spring that contacts the first protrusion can be prevented. Therefore, for example, even if the dimensions of the engaging portions are inconsistent and the shape of the engaging portions becomes larger, damage to the leaf spring can be suppressed.

[0184] In this technology, for example, when a predetermined direction orthogonal to the axial direction of the feed screw shaft is designated as the first orthogonal direction, one side of the first orthogonal direction is designated as the third direction side, and the opposite side of the third direction side is designated as the fourth direction side, the end of the third direction side of the elastic plate base becomes the end of the root side of the elastic plate base. The elastic plate base, in a state where the engaging portion is not engaged with the movable body, tilts towards the second direction side as it moves towards the fourth direction side. In this case, it is easy to position the engaging portion between the support portion and the elastic plate portion from the third direction side.

[0185] In this technology, it is preferable that the movable body includes a nut component, on which a feed screw shaft is disposed on its inner circumference and moves axially along the feed screw shaft together with a sliding component. The sliding component includes a nut retaining portion that holds the nut component and is formed of resin. In the sliding component, a support portion, an elastic plate portion, and a nut retaining portion are integrally formed. When configured in this way, compared to the case where the elastic plate portion, the nut retaining portion, and the support portion are formed separately, the cost of the components constituting the linear drive device can be reduced.

[0186] In this technology, it is preferred that when a predetermined direction orthogonal to the axial direction of the feed screw shaft is set as the first orthogonal direction, and a direction orthogonal to both the axial direction of the feed screw shaft and the first orthogonal direction is set as the second orthogonal direction, the end of the elastic plate base on one side of the first orthogonal direction becomes the root end of the elastic plate base. The sliding member has wall portions disposed on both sides of the elastic plate portion in the second orthogonal direction, and spring mounting holes for the end of the leaf spring disposed in the second orthogonal direction are formed in the wall portions. The elastic plate portion has an anti-deviation protrusion that contacts the end face of the leaf spring and is used to prevent the leaf spring from deviating relative to the elastic plate base in a direction orthogonal to the thickness direction of the leaf spring. The anti-deviation protrusion protrudes from the elastic plate base toward the first direction side.

[0187] When configured in this way, even if the width of the spring mounting hole in the axial direction of the feed screw shaft is wider than the thickness of the leaf spring, deviation of the leaf spring relative to the base of the elastic plate can be prevented. Therefore, it is possible to prevent the end of the leaf spring disposed in the spring mounting hole from being constrained by the wall portion and to prevent deviation of the leaf spring relative to the base of the elastic plate. That is, it is possible to prevent deviation of the leaf spring relative to the base of the elastic plate and to facilitate elastic deformation of the leaf spring, thereby effectively suppressing damage to the leaf spring.

[0188] In this technology, it is preferable that when the portion of the leaf spring positioned between the two wall portions is designated as the central portion of the leaf spring, the shape of the central portion of the leaf spring, when viewed axially from the feed screw shaft, becomes rhomboid. When configured in this way, stress concentration in a specific portion of the central portion of the leaf spring can be suppressed when the leaf spring undergoes elastic deformation. Therefore, damage to the leaf spring can be effectively suppressed.

[0189] In this technology, preferably, for example, when a spring mounting hole formed in one of the two wall portions is designated as a first spring mounting hole, a spring mounting hole formed in the other wall portion is designated as a second spring mounting hole, the end of the leaf spring disposed in the first spring mounting hole is designated as a first leaf spring end, and the end of the leaf spring disposed in the second spring mounting hole is designated as a second leaf spring end, the width of the first spring mounting hole in the first orthogonal direction is wider than the width of the second spring mounting hole in the first orthogonal direction, and wider than the maximum width of the central portion of the leaf spring in the first orthogonal direction, the maximum width of the second leaf spring end in the first orthogonal direction is narrower than the maximum width of the central portion of the leaf spring in the first orthogonal direction, and the maximum width of the first leaf spring end in the first orthogonal direction is greater than or equal to the maximum width of the central portion of the leaf spring in the first orthogonal direction.

[0190] With this configuration, the leaf spring can be easily mounted onto the sliding member from the side forming the first spring mounting hole. Furthermore, this configuration narrows the width of the second spring mounting hole in the first orthogonal direction, thus ensuring the strength of the wall portion forming the second spring mounting hole. Additionally, this configuration widens the maximum width of the first leaf spring end in the first orthogonal direction, thus suppressing wobbling of the first leaf spring end in the first orthogonal direction within the first spring mounting hole.

[0191] In this technology, for example, the driving object is a mirror holding member used in a head-up display device having a reflector and a display that emits display light toward the reflector, fixing the reflector and rotatably holding it on the frame of the head-up display device.

Claims

1. A linear drive device for driving a driven object, characterized in that, It includes an electric motor and a movable body. The electric motor has a feed screw shaft. When the movable body is engaged with the feed screw shaft and the feed screw shaft rotates, it moves linearly along the axial direction of the feed screw shaft and is engaged by the engaging part of the driven object. The movable body includes a sliding component and a flat leaf spring. The sliding component moves linearly along the axial direction of the feed screw shaft, and the flat leaf spring is held in place by the sliding component and is capable of elastic deformation along the axial direction of the feed screw shaft. When one side of the axial direction of the feed screw shaft is designated as the first direction side, and the opposite side of the first direction side, i.e., the other side of the axial direction of the feed screw shaft, is designated as the second direction side, The sliding component includes a support portion and an elastic plate portion. The support portion allows the engaging portion to contact the component from the first direction side. The elastic plate portion is disposed closer to the first direction side than the support portion and is capable of elastic deformation along the axial direction of the feed screw shaft. The elastic sheet portion has a flat elastic sheet base and a plurality of protrusions. The plurality of protrusions protrude from the elastic sheet base toward the first direction side and are arranged in a direction from the root of the elastic sheet base toward the front end. The elastic sheet portion contacts the engaging portion from the first direction side and applies force to the engaging portion toward the second direction side. The leaf spring is disposed on the first direction side of the plurality of protrusions. The plurality of protrusions contact the leaf spring when the elastic plate portion contacts the engaging portion and applies force to the engaging portion.

2. The linear drive device according to claim 1, characterized in that, When one of two adjacent protrusions in the direction from the root of the elastic sheet base toward the front end is designated as the first protrusion, and the other protrusion is designated as the second protrusion... The first protrusion is disposed on the front end side of the elastic sheet base, which is closer to the second protrusion. The amount by which the first protrusion protrudes relative to the elastic sheet base is smaller than the amount by which the second protrusion protrudes relative to the elastic sheet base.

3. The linear drive device according to claim 2, characterized in that, The elastic sheet portion has two protrusions.

4. The linear drive device according to any one of claims 1 to 3, characterized in that, When a predetermined direction orthogonal to the axial direction of the feed screw shaft is defined as the first orthogonal direction, one side of the first orthogonal direction is defined as the third direction side, and the opposite side of the third direction side is defined as the fourth direction side, The third-direction end of the elastic sheet base becomes the root-side end of the elastic sheet base. The base of the elastic sheet tilts toward the second direction side as it moves toward the fourth direction side when the engaging portion is not engaged with the movable body.

5. The linear drive device according to any one of claims 1 to 3, characterized in that, The movable body includes a nut component, on which the feed screw shaft is disposed on its inner circumference, and moves axially along the feed screw shaft together with the sliding component. The sliding member has a nut retaining portion for retaining the nut member, and is formed of resin. In the sliding component, the support portion, the elastic plate portion, and the nut retaining portion are integrally formed.

6. The linear drive device according to any one of claims 1 to 3, characterized in that, When a predetermined direction orthogonal to the axial direction of the feed screw shaft is defined as the first orthogonal direction, and a direction orthogonal to both the axial direction of the feed screw shaft and the first orthogonal direction is defined as the second orthogonal direction, The end of the elastic sheet base on one side of the first orthogonal direction becomes the root side end of the elastic sheet base. The sliding member has wall portions disposed on both sides of the elastic sheet portion in the second orthogonal direction. A spring mounting hole is formed in the wall portion for arranging the end of the leaf spring in the second orthogonal direction. The elastic sheet portion has an anti-deviation protrusion that contacts the end face of the leaf spring, and is used to prevent the leaf spring from deviating relative to the base of the elastic sheet in a direction orthogonal to the thickness direction of the leaf spring. The anti-deviation protrusion extends from the base of the elastic sheet toward the first direction side.

7. The linear drive device according to claim 6, characterized in that, When the portion of the leaf spring positioned between the two wall portions is designated as the central portion of the leaf spring... The shape of the central portion of the leaf spring when viewed axially from the feed screw shaft is rhomboid.

8. The linear drive device according to claim 7, characterized in that, When the spring mounting hole formed in one of the two wall portions is designated as the first spring mounting hole, and the spring mounting hole formed in the other wall portion is designated as the second spring mounting hole, the end of the leaf spring disposed in the first spring mounting hole is designated as the first leaf spring end, and the end of the leaf spring disposed in the second spring mounting hole is designated as the second leaf spring end, The width of the first spring mounting hole in the first orthogonal direction is wider than the width of the second spring mounting hole in the first orthogonal direction, and also wider than the maximum width of the central portion of the leaf spring in the first orthogonal direction. The maximum width of the end of the second leaf spring in the first orthogonal direction is narrower than the maximum width of the central portion of the leaf spring in the first orthogonal direction. The maximum width of the end of the first leaf spring in the first orthogonal direction is greater than or equal to the maximum width of the central portion of the leaf spring in the first orthogonal direction.

9. The linear drive device according to any one of claims 1 to 3, characterized in that, The driving object is a mirror holding component used in a head-up display device that includes a reflector and a display that emits display light toward the reflector. The mirror holding component fixes the reflector and is rotatably held on the frame of the head-up display device.

10. A head-up display device, characterized in that, Equipped with the linear drive device as described in claim 9 and the mirror holding component, The portion of the engaging part that contacts the support part, namely the first contact portion, and the portion of the engaging part that contacts the elastic sheet part, namely the second contact portion, are formed into a convex curved surface.

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