DRIVE DEVICE AND DRIVE DEVICE USED IN HEAD-UP DISPLAY DEVICE

Abstract

A drive device (1) comprising a drive unit (3), a lead screw (4) which is rotationally driven by the drive unit (3), and a movable element (6) which moves by a driving force of the drive unit (3), characterized in that the movable element (6) has a main body portion (9), a drive force transmission portion which transmits the drive force of the drive unit (3) to the main body portion (9), and a preload application portion which is provided separately from the main body portion (9), the drive force transmission section comprises a first threaded section screwed to the lead screw (4) and moves the main body section (9) together with a rotation of the lead screw (4) in an axial direction of the lead screw (4) and the preload applying portion comprises a second threaded portion screwed to the lead screw (4) and applies a preload between the first threaded portion and the second threaded portion, wherein the movable element (6) has a support portion (30) supporting a supported element, and the support portion (30) comprises an elastic support portion for biasing the supported member and a fixed support portion provided opposite to the elastic support portion in a moving direction of the movable member (6) and supporting the supported member biased by the elastic support portion.

Description

TECHNICAL FIELD

[0001] The present invention relates to a drive device that moves a movable member by a driving force of a drive unit. STATE OF THE ART

[0002] Conventionally, a head-up display device is known in which display light from a display component is reflected by a reflective member (concave mirror) and projected onto a windshield of a vehicle, thereby allowing a driver of the vehicle to visually recognize a projected display image (virtual image). In such a head-up display device, a drive device that pivots a mirror holder supporting a concave mirror around a predetermined rotation shaft is generally used to adjust a reflection angle of the display light by the reflective member.

[0003] Patent Documents 1 and 2 describe a driving device in which a mirror holder is pivoted by transmitting a driving force to a protrusion partially protruding outward from the mirror holder in a radial direction of a rotating shaft. This driving device includes a stepping motor, a lead screw (feed screw) rotationally driven by the stepping motor, a guide shaft arranged parallel to the lead screw, a frame for supporting the lead screw and the guide shaft, and a slider having a nut screwed to the lead screw and a guide hole formed therein for passing the guide shaft. The slider reciprocates along an axial direction of the lead screw along with the rotation of the lead screw. The slider has a support portion for supporting the protrusion of the mirror holder as a supported member.Thus, the mirror holder can be pivoted by the back and forth movement of the slider that carries the protruding part of the mirror holder.

[0004] JP 2016-75470 A discloses a linear drive device comprising a lead screw and a guide shaft, a base with a raceway parallel to them, a slider with a guide bore through which the guide shaft passes, and a nut that is screwed to the lead screw and moves linearly in the axial direction upon rotation of the lead screw. The device further comprises a first compression spring for applying rotational preload forces in a circumferential direction around the lead screw. LIST OF CITIONSPATENT LITERATURE [Patent Document 1] Japanese Patent Application Publication No. JP 2015-102700 A [Patent Document 2] Japanese Patent Application Publication No. JP 2016-109974 A SUMMARY OF THE INVENTION TASK TO BE SOLVED BY THE INVENTION

[0005] In the drive devices described in Patent Documents 1 and 2, the slider may rattle in the moving direction due to a play between the lead screw and the nut, which may cause rattling of the mirror holder and resulting blurring of the displayed image.

[0006] Therefore, it is an object of the present invention to provide a driving device that suppresses rattling of a movable member in the moving direction and a driving device used in a head-up display device. MEANS TO SOLVE THE TASK

[0007] To achieve the above-described object, a drive device according to the present invention comprises a drive unit, a lead screw rotationally driven by the drive unit, and a movable member moving by a drive force of the drive unit, wherein the movable member has a main body portion, a drive force transmission portion that transmits the drive force of the drive unit to the main body portion, and a preload application portion provided separately from the main body portion, the drive force transmission portion has a first threaded portion screwed to the lead screw and moves the main body portion along with rotation of the lead screw in an axial direction of the lead screw, and the preload application portion has a second threaded portion screwed to the lead screw,and exerts a preload between the first threaded portion and the second threaded portion.,

[0008] By the drive device according to the present invention, the play (backlash) between the lead screw and each of the threaded portions can be absorbed and chatter in the moving direction of the movable member (axial direction of the lead screw) can be suppressed.

[0009] In one aspect of the present invention, it is preferable that the driving force transmitting portion includes a first nut member and has the first threaded portion provided separately from the main body portion, the preload applying portion includes a second nut member having the second threaded portion and a preload member provided between the first nut member and the second nut member, a nut arranging portion is formed in the main body portion in which the first nut member and the second nut member are arranged, and the first nut member and the second nut member are arranged in the nut arranging portion in a state in which rotation with respect to the main body portion is restricted.In this case, it is preferable that a driving force receiving portion is formed in the nut arrangement portion, which receives a driving force of the drive unit from the first nut member, and that the first nut member receives a preload from the preload member via the drive receiving portion. This allows both the first nut member and the second nut member to be arranged in the main body portion, and space can be saved in the design of the device.

[0010] Further, in one aspect of the present invention, it is preferable that the biasing member is a coil spring, the lead screw extends in an interior of the coil spring, and the biasing member is arranged between the driving force receiving portion and the second nut member.In this case, it is preferable that the first nut member includes a tubular portion in which the first threaded portion is formed and a flange portion, the flange portion contacting the driving force receiving portion, and a restricting portion that restricts rotation of the first nut member by contacting the flange portion is provided at the nut locating portion, and it is preferable that the second nut member includes a tubular portion in which the second threaded portion is formed and a flange portion, and a restricting portion that restricts rotation of the second nut member by contacting the flange portion is provided at the nut locating portion. Thereby, the first nut member, the biasing member, and the second nut member can be configured more compactly, and further space saving can be achieved.

[0011] Further, it is preferable that a drive device according to the present invention includes a jig that rotatably supports a lead screw, the jig has a plate-shaped jig main body facing the main body portion, and the nut arranging portion opens to a direction intersecting a direction in which the main body portion and the jig main body face each other. Therefore, the jig (jig main body) does not pose an obstacle to arranging the first nut member and the second nut member in the nut arranging portion, thereby improving workability.

[0012] Further, it is preferable that a guide shaft for guiding a movement of the movable member is mounted on the frame, the guide shaft is arranged parallel to the lead screw, the movable member has a support portion that supports a supported member, and the support portion is provided on an opposite side of the guide shaft with the lead screw interposed therebetween. This can stabilize the movement of the movable member.

[0013] The invention is further characterized in that the movable member has a support portion that supports a supported member, and the support portion has an elastic support portion for biasing the supported member, and a fixed support portion that is provided opposite to the elastic support portion in a moving direction of the movable member and supports the supported member biased by the elastic support portion. Thus, the supported member is supported in a state pressed against the fixed support portion by the elastic support portion, whereby the position of the supported member can be determined using the fixed support portion as a reference.

[0014] Further, it is preferable that the elastic support portion includes an elastic member that contacts the supported member and biases the supported member toward the fixed support portion, and an elastic member fixing portion that holds the elastic member. The elastic member fixing portion is provided in the main body portion. In this case, it is preferable that the elastic member is a leaf spring. This allows the elastic member to be easily fixed.

[0015] Furthermore, it is preferable that the elastic member includes a fixed plate portion fixed to the elastic member fixing portion, and an elastically deformable plate portion extending from an end portion of the fixed plate portion and elastically deformable. The elastically deformable plate portion includes a first elastic portion extending from the end portion of the fixed plate portion and a second elastic portion extending from an end portion of the first elastic portion. A contact portion contacting the supported member is formed on the second elastic portion. This ensures the elasticity of the elastically deformable plate portion.

[0016] Further, it is preferable that the fixed support portion be formed of a material having higher strength than the main body portion, and be partially embedded and fixed in the main body portion. This can improve the strength of the support portion supporting the supported member.

[0017] Furthermore, it is preferable that the fixed support portion supports the supported member at a position opposite to the supported member in the moving direction of the movable member. Further, it is preferable that the fixed support portion includes a support main body portion extending in a direction intersecting the moving direction of the movable member and an extension portion extending from an end portion of the support main body portion in the moving direction of the movable member, and at least a part of an upper surface of the extension portion is covered by the main body portion. This can improve the prevention of detachment of the fixed support portion from the main body portion.

[0018] Further, it is preferable that the fixed support portion includes a support main body portion extending in a direction intersecting the moving direction of the movable member, and an extension portion extending from an end portion of the support main body portion in the moving direction of the movable member, and at least a part of the upper surface of the extension portion is covered by the main body portion. This can improve the prevention of detachment of the fixed support portion from the main body portion. To achieve the above-described object, a drive device used in a head-up display device according to the present invention includes a drive unit, a lead screw rotationally driven by the drive unit, and a movable member moving by a driving force of the drive unit, wherein the movable member includes a main body portion,a driving force transmission section that transmits the driving force of the drive unit to the main body section, a preload application section provided separately from the main body section, and a support section that pivotally supports a mirror holder for holding a concave mirror. The driving force transmission section has a first threaded portion screwed to the lead screw and moves the main body section in an axial direction of the lead screw along with rotation of the lead screw, and the preload application section has a second threaded portion screwed to the lead screw and applies a preload between the first threaded portion and the second threaded portion. Furthermore, it is preferred that the concave mirror radiates an indicator light onto a windshield of a vehicle. The invention is further characterized in thatthat the support portion has an elastic support portion for preloading the mirror holder and a fixed support portion which is provided opposite to the elastic support portion in the direction of movement of the movable member and supports the mirror holder preloaded by the elastic support portion, a first nut member is provided separately from the main body portion, and a second nut member having the second threaded portion and a preloading member provided between the first nut member and the second nut member, which applies a preload between the first threaded portion and the second threaded portion, are provided, a nut arranging portion is formed in the main body portion, in which the first nut member and the second nut member are arranged, wherein the first nut member and the second nut member are arranged in the nut arranging portion in a state,in which rotation with respect to the main body portion is restricted, and a driving force receiving portion is formed in the nut arrangement portion, which receives a driving force of the drive unit from the first nut element, and the first nut element is preloaded by the preloading element via the driving force receiving portion. Furthermore, it is preferred that a frame is provided which rotatably supports the lead screw on one side and on the other side of which the drive unit is attached, and the fixed support portion is positioned on the other side of the movable element. Furthermore, it is preferred that the mirror holder pivots in constant contact with the fixed support portion. Furthermore, it is preferred that the first nut element and the fixed support portion are attached to the movable element.and the first nut member and the fixed support portion are arranged at substantially the same position in the axial direction of the lead screw. With such an arrangement, the drive device can suppress rattling of respective problematic parts of the head-up display device.

[0019] Further, a housing, a concave mirror that reflects a display light from a display device accommodated in the housing, a mirror holder that is housed in the housing, rotatably mounted on the housing, and supports the concave mirror, and a drive device that is housed in the housing and adjusts a position of the mirror holder to adjust an angle of the concave mirror are provided. The drive device includes a drive unit, a lead screw that is rotationally driven by the drive unit, and a movable member that moves by a drive force of the drive unit. The movable member includes a main body portion, a drive force transmission portion that transmits a drive force of the drive unit to the main body portion, a bias application portion that is provided separately from the main body portion, and a support portion that pivotally supports the mirror holder.The drive force transmission section includes a first threaded portion screwed to the lead screw and moves the main body portion along with rotation of the lead screw in the axial direction of the lead screw, and the preload application section includes a second threaded portion screwed to the lead screw and applies a preload between the first threaded portion and the second threaded portion. The head-up display device according to the present invention can absorb the backlash (rebound) between the lead screw and each of the threaded portions and suppress rattling in the moving direction of the movable member (axial direction of the lead screw). Furthermore, it is preferable that the support section includes an elastic support portion for preloading the mirror holder and a fixed support portion.which is provided opposite the elastic support portion in the direction of movement of the movable member and supports the mirror holder preloaded by the elastic support portion, a first nut member is provided separately from the main body portion, and a second nut member having the second threaded portion and a biasing member provided between the first nut member and the second nut member, which applies a preload between the first threaded portion and the second threaded portion, are provided, a nut arranging portion is formed in the main body portion, in which the first nut member and the second nut member are arranged, wherein the first nut member and the second nut member are arranged in the nut arranging portion in a state in which rotation with respect to the main body portion is restricted,and a driving force receiving portion is formed in the nut arrangement portion, which receives a driving force of the drive unit from the first nut element, and the first nut element applies a preload from the preload element via the driving force receiving portion. Furthermore, a frame is provided, which rotatably supports the lead screw on one side and on the other side of which the drive unit is fixed, wherein the fixed support portion can be positioned on the other side of the movable element. Furthermore, the drive device comprises a switching unit that performs position detection.The switching unit can perform position detection by contacting the fixed support portion. Furthermore, the mirror holder can pivot in constant contact with the fixed support portion. Furthermore, the first nut member and the fixed support portion can be arranged at substantially the same position in the axial direction of the lead screw. Furthermore, the concave mirror can radiate an indicator light onto a windshield of a vehicle. EFFECT OF THE INVENTION

[0020] In a driving device and a driving device used in a head-up display device according to the present invention, rattling of a movable member in a moving direction can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS [ Fig. 1] Fig. 1 is a schematic configuration diagram of a head-up display device according to an embodiment of the present invention. [ Fig. 2] Fig. 2 is a schematic sectional view of a display device of the Fig. Head-up display device shown in Figure 1. [ Fig. 3] Fig. 3 is a schematic perspective view showing a drive device according to the present embodiment. [ Fig. 4] Fig. 4 is a schematic side view showing the drive device according to the present embodiment. [ Fig. 5] Fig. 5 is a schematic perspective view showing an enlarged view of a movable member according to the present embodiment. [ Fig. 6] Fig. 6 is a schematic perspective view showing an elastic member according to the present embodiment. [ Fig. 7] Fig. 7 is a schematic perspective view showing an elastic member attachment portion according to the present embodiment. [ Fig. 8] Fig. 8 is a schematic perspective view of the Fig. 7 shown fastening section for the elastic element, seen from a different direction. [ Fig. 9] Fig. 9 is a schematic perspective view showing a support member according to the present embodiment. [ Fig. 10] Fig. 10 is a transparent side view of the Fig. 5 shown movable element. [ Fig. 11] Fig. 11 is a transparent top view of the Fig. 5 shown movable element. [ Fig. 12] Fig. 12A and Fig. 12B are schematic side views showing the drive device according to the present embodiment from a Fig. 4 opposite side. [ Fig. 13] Fig. 13 is a schematic view for explaining the operation of a mother unit according to the present embodiment. DESCRIPTION OF THE EMBODIMENTS

[0021] Embodiments of the present invention will now be described with reference to the drawings.

[0022] First, a head-up display device for a vehicle to which the present invention is applied will be described with reference to Fig. 1 and Fig. 2 described. Fig. 1 is a schematic configuration diagram of the head-up display device according to an embodiment of the present invention. Fig. 2 is a schematic sectional view of a display device in the head-up display device according to the present embodiment.

[0023] As in Fig. 1, a head-up display device 1000 includes a display device 102 provided in an instrument panel 101 of a vehicle 100, and a display light L projected from the display device 102 is reflected by a windshield 103, which is a projecting element, toward a driver 104 of the vehicle 100 to display a virtual image (display image) V. In other words, the head-up display device 1000 irradiates (projects) the display light L emitted from a liquid crystal display 110, described later, of the display device 102 onto the windshield 103, and the driver 104 can visually recognize the virtual image V obtained by this irradiation. Thus, the driver 104 can view the virtual image V superimposed on the scenery.

[0024] As in Fig. 2, the display device 102 includes the liquid crystal display 110, a first reflector 120, a second reflector 130, and a housing 140.

[0025] The liquid crystal display 110 includes a light source 111 and a liquid crystal display component (display component) 112. The light source 111 is composed of a light-emitting diode mounted on a circuit board R. The liquid crystal display component 112 is a thin-film transistor (TFT) type liquid crystal display component positioned in front of (directly above) the light source 111 to transmit the light emitted from the light source 111 and form the display light L. Based on a drive signal from a component drive circuit (not shown), the liquid crystal display component 112 displays information to be displayed (for example, the speed and engine speed of the vehicle) in the form of numerical values ​​or the like by light emitted from the light source 111 arranged behind (directly below) the liquid crystal display component 112.It should be noted that the information to be displayed is not limited to the vehicle's speed and engine speed, and furthermore, the display format is not limited to numerical values, but can take a variety of forms. The liquid crystal display 110 outputs the display light L, which consists of light in the visible wavelength range. However, for example, a light source 111 emitting red light (mainly in the emission wavelength range of 610 to 640 nm) may also be used.

[0026] The liquid crystal display 110 constructed in this way is provided in the casing 140 such that a surface on the emission side of the display light L faces a cold mirror 121 of the first reflector 120 described later, and is held in such a position and orientation that the optical axis of the display light L intersects the cold mirror 121.

[0027] The first reflector 120 includes the cold mirror 121 and a fixing member 122 for fixing the cold mirror 121 in the housing 140. The cold mirror 121 reflects the display light L emitted from the liquid crystal display 110 to the second reflector 130 (concave mirror 131). The cold mirror 121 includes a substantially rectangular glass substrate 121a and a first reflective layer 121b formed on one surface side of the glass substrate 121a (surface facing the concave mirror 131 of the second reflector 130, described later) by vapor deposition or the like and composed of multilayer interference films with different film thicknesses. Further, the fixing member 122 is made of, for example, a black synthetic resin material and fixed to the housing 140.

[0028] Note that the cold mirror 121 reflects light in the visible wavelength range (450 to 750 nm) including the emission wavelength range of the liquid crystal display 110 with high reflectivity (for example, 80% or more), and reflects light outside the visible wavelength range with low reflectivity. In this case, a cold mirror that reflects light outside the visible wavelength range, particularly light in the infrared wavelength range (infrared radiation or thermal radiation of sunlight), with low reflectivity (for example, 15% or less) is used as the cold mirror 121. Note that light not reflected by the first reflective layer 121b passes through the cold mirror 121.In the present embodiment, the cold mirror 121 is arranged, similarly to the liquid crystal display 110, at a position that is not directly visible from a later-described light-transmitting cover 144 of the housing 140, and to which light from outside (external light) such as sunlight does not directly impinge.

[0029] The second reflector 130 includes the concave mirror 131 and a mirror holder 132 that holds the concave mirror 131. The concave mirror 131 has a second reflective layer 131a deposited on a concave surface of a polycarbonate resin substrate, and magnifies the display light L from the cold mirror 121 (i.e., the liquid crystal display component 112) and reflects it through the light-transmitting cover 144 of the housing 140 to the windshield 103. The concave mirror 131 is arranged so that the second reflective layer 131a faces the cold mirror 121 and the light-transmitting cover 144 of the housing 140, and is located at a position visible from the light-transmitting cover 144.

[0030] The mirror holder 132 is made of a synthetic resin material and has a rotary shaft A supported by a bearing portion provided in the housing 140 and orthogonal to the optical axis of the display light L. That is, the mirror holder 132 and the concave mirror 131 held by the mirror holder 132 are pivotable about the rotary shaft A, and thus an angular position of the mirror holder 132, that is, a projection direction of the display light L, can be adjusted. A protruding piece 132a is formed in the mirror holder 132, which partially protrudes outward in a radial direction of the rotary shaft A. The mirror holder 132 can be pivoted by moving the protruding piece 132a by a driving force from a driving device 1. Details of the

[0031] Drive device 1 will be described later.

[0032] The housing 140 is formed, for example, by die-casting aluminum and includes an upper housing part 141 and a lower housing part 142, each of which is substantially U-shaped in cross-section. The upper housing part 141 and the lower housing part 142 form an interior space 143, and the liquid crystal display 110, the first reflector 120, and the second reflector 130 are housed in this interior space 143.

[0033] In the upper case 141, an opening portion 141a is formed at a position facing the concave mirror 131, and the light-transmitting cover 144 is arranged to close the opening portion 141a. The light-transmitting cover 144 is made of a light-transmitting resin material (for example, acrylic resin) and functions as a light-transmitting member that transmits (transmits) the display light L reflected by the concave mirror 131. That is, the display light L reflected by the concave mirror 131 is projected onto the windshield 103 through the light-transmitting cover 144 provided on the case 140, thereby displaying the virtual image V.

[0034] Next, the drive device 1 according to the present embodiment will be described with reference to Fig. 3 and Fig. 4 described. Fig. 3 is a schematic perspective view showing the drive device according to the present embodiment. Fig. 4 is a schematic side view showing the drive device 1 according to the present embodiment, showing a state in which the protruding piece 132a of the mirror holder 132 is supported. Note that in the following description, in a direction in which an axis L of a lead screw 4 (shaft 19) extends, a side from which the lead screw 4 protrudes is defined as an output side L1, and a side opposite (other side) to the side from which the lead screw 4 protrudes is defined as a non-output side L2. Further, with respect to the direction of the axis L, a direction in which support portions 2b, 2c of a stage 2 extend is defined as an X direction, and a direction orthogonal to the X direction and the direction of the axis L is defined as a Y direction.

[0035] The drive device 1 includes the lead screw 4, on the outer peripheral surface of which a spiral groove is formed, a drive unit 3 for rotating the lead screw 4 around the axis L, a movable member 6 that engages the spiral groove and moves in the direction of the axis L, and the frame 2 that supports the drive unit 3 and the like. A guide shaft 5 is fixed in the frame 2 and is arranged parallel to the lead screw 4 along the direction of the axis L. The drive unit 3 is a motor such as a stepping motor and the like, and mainly consists of a stator 14 constituting a motor housing and a rotor (not shown) arranged inside the stator 14. The rotor includes the shaft 19 and a permanent magnet (not shown) fixed to the shaft 19.

[0036] The stator 14 is fixed by welding or the like to the support portion 2b on the non-output side L2 of the stage 2 in the direction of the axis L. A substrate holder 60 holding a power supply board 70 is fixed to the support portion 2b with bolts.

[0037] A terminal pin 82 as a power supply unit is provided on a side surface of the stator 14 and is electrically connected to the power supply board 70. A terminal part (not shown) of a drive coil of the stator 14 is wound around the terminal pin 82, and by soldering the terminal pin 82 and the power supply board 70, the power supply board 70 and the drive coil can be electrically connected.

[0038] A switching unit 50 is attached to the power supply board 70. The switching unit 50 is a push-button switch that detects an initial position in the movement direction (axis L direction) of the movable element 6. The electrical connection between the switching unit 50 and the power supply board 70 is established by soldering terminal pins 52a, 52b of the switching unit 50 to the power supply board 70.

[0039] The rack 2 includes a plate-shaped rack main body 2a and the pair of support portions 2b, 2c formed by bending both ends of the rack main body 2a in the longitudinal direction, and the rack 2 is fixed to the housing 140 using a hole 2g formed in the rack main body 2a. The drive unit 3 is fixed to the support portion 2b on the non-output side L2 in the direction of the axis L.

[0040] The lead screw 4 is integrally formed with the shaft 19 of the drive unit 3 and is formed by forming a spiral groove on a part of the outer peripheral surface of the shaft 19 (part protruding from the stator 14 toward the output side L1 in the axis L direction). As a result, the lead screw 4 is rotationally driven by the drive unit 3. The lead screw 4 is arranged substantially parallel to the frame main body 2a, and a front end of the lead screw 4 on the output side L1 in the axis L direction is rotatably supported by a bearing 7a provided in the support portion 2c of the frame 2 on the output side L1 in the axis L direction.Further, an end portion of the shaft 19 on the non-output side L2 is rotatably supported in the direction of the axis L by a bearing 7b fixed to the drive unit 3, and a front end of the shaft 19 on the non-output side L2 is biased toward the output side L1 in the direction of the axis L by a biasing member 7c formed of a leaf spring. The guide shaft 5 is arranged parallel to the lead screw 4, and both ends of the guide shaft 5 are respectively fixed to the support portions 2b, 2c of the frame 2. In the present embodiment, the guide shaft 5 and the lead screw 4 are arranged to overlap in the X direction.

[0041] The movable member 6 includes a nut unit 40 that engages the lead screw 4 and moves in the direction of the axis L, a main body portion 9 that moves integrally with the nut unit 40 in the direction of the axis L, and a support portion 10 that is provided above the main body portion 9 and holds the protruding piece 132a of the mirror holder 132, which is a supported member. A guide hole 8 through which the guide shaft 5 passes and a nut mounting portion 11 in which the nut unit 40 is mounted are formed in the main body portion 9. The nut unit 40 reciprocates in the direction of the axis L along with rotation of the lead screw 4 caused by the drive unit 3, causing the movable member 6 to reciprocate in the direction of the axis L, guided by the guide shaft 5.As a result, the protruding piece 132a reciprocates in the direction of the axis L, whereby the mirror holder 132 can be pivoted at a predetermined angle about the rotary shaft A (see . Fig. 2). (support section)

[0042] The support portion 10 includes an elastic support portion 20 for biasing the protruding piece 132a of the mirror holder 132 toward the non-output side L2 in the axis L direction, and a fixed support portion 30 provided opposite to the elastic support portion 20 on the non-output side L2 in the axis L direction, and supporting the protruding piece 132a biased by the elastic support portion 20. According to such a structure, the protruding piece 132a is supported in a state of always being pressed against the fixed support portion 30 by the elastic support portion 20. Therefore, the position of the protruding piece 132a can always be determined with the fixed support portion 30 as a reference, and even if, for example, movement or vibration occurs, the position of the protruding piece 132a hardly shifts.Thus, even when the vehicle vibrates, it is possible to simultaneously prevent rattling of the protruding piece 132a and suppress the occurrence of blur in the display image due to the biasing force of the elastic support portion 20. Thus, the support portion 10 according to the present embodiment can improve the positioning accuracy of the protruding piece 132a of the mirror holder 132.

[0043] The elastic support portion 20 includes an elastic member 21 that contacts the protruding piece 132a of the mirror holder 132 and biases the protruding piece 132a toward the fixed support portion 30, and an elastic member fixing portion 22 for fixing the elastic member 21. The elastic member fixing portion 22 is made of a synthetic resin material such as polyacetal and is integrally formed with the main body portion 9. Note that the elastic member fixing portion 22 may also be formed separately from the main body portion 9 and then fixed to the main body portion 9 by a method such as bonding.

[0044] The fixed support portion 30 is made of a metal such as stainless steel and is formed of a material having higher strength than the resin main body portion 9. The fixed support portion 30 is integrally formed with the main body portion 9 by insert molding. Therefore, the fixed support portion 30 is partially embedded and fixed in the main body portion 9. With such a structure, the strength of the fixed support portion 30 can be improved compared to a case where the fixed support portion 30 is integrally formed with the main body portion 9 by resin. As a result, the resonance frequency of the entire head-up display device 1000 can be increased, the occurrence of resonance due to vibration of the vehicle can be suppressed, and the occurrence of blur in the display image can be suppressed. (Elastic support section)

[0045] With reference to Fig. 5 to Fig. 8, a detailed structure of the elastic support portion 20 according to the present embodiment will be described. Fig. Fig. 5 is a schematic perspective view showing the movable member 6 according to the present embodiment in an enlarged manner. It should be noted that for the sake of simplicity, the illustration of the nut unit 40 in Fig. 5 is omitted. Fig. 6 is a schematic perspective view showing the elastic member 21 according to the present embodiment. Fig. 7 is a schematic perspective view showing the elastic member fixing portion 22 according to the present embodiment. Fig. 8 is a schematic perspective view of the Fig. 7, seen from a different direction. It should be noted that for the sake of simplicity, the illustration of the fixed support section 30 in Fig. 7 and Fig. 8 is omitted.

[0046] As in Fig. As shown in Fig. 6, the elastic member 21 includes a fixed plate portion 23 attached and fixed to the elastic member attachment portion 22, and an elastically deformable plate portion 24 extending from one end portion of the fixed plate portion 23 and elastically deformable. The elastic member 21 according to the present embodiment is a plate spring having a comparatively large width (length in the Y direction). A first engaging portion 23a is formed on the fixed plate portion 23 and engages with a second engaging portion 26b of the elastic member attachment portion 22. In the present embodiment, the first engaging portion 23a is an opening portion long in the X direction.The elastically deformable plate portion 24 is configured by a first elastic portion 24a extending from one end portion of the fixed plate portion 23 and a second elastic portion 24b extending obliquely from one end portion of the first elastic portion 24a toward the non-discharge side L2 in the direction of the axis L. The first elastic portion 24a extends on an extension line of the fixed plate portion 23 (to the X direction in which the fixed plate portion 23 extends), and the second elastic portion 24b extends at an acute angle to the first elastic portion 24a. A first support point portion 25a is formed between the fixed plate portion 23 and the first elastic portion 24a. As shown in FIG. Fig. 5, the first support point portion 25a is defined as a contact portion between the elastic member 21 and an upper end of the elastic member fixing portion 22. In other words, the first support point portion 25a is defined as a boundary portion between a portion of the elastic member 21 held by the elastic member fixing portion 22 and a portion not held by the elastic member fixing portion 22. The first elastic portion 24a is elastically deformable with respect to the fixed plate portion 23 with the first support point portion 25a as a support point.Furthermore, a second support point portion 25b is formed as a bent portion of the elastically deformable plate portion 24 between the first elastic portion 24a and the second elastic portion 24b, and the second elastic portion 24b is elastically deformable with respect to the first elastic portion 24a using this second support point portion 25b as a support point.

[0047] Furthermore, the second elastic portion 24b of the elastically deformable plate portion 24 is bent such that the front end side of the second elastic portion 24b faces the fixed plate portion 23 side. The bent portion functions as a protruding piece contact portion 25c that contacts the protruding piece 132a of the mirror holder 132. Furthermore, since the protruding piece contact portion 25c is bent and forms a curved surface, snagging when supporting the protruding piece 132a can be prevented. Note that the protruding piece contact portion 25c may have any shape that does not snag on the protruding piece 132a and allows the protruding piece 132a to move smoothly, and a tapered shape is also possible instead of the curved surface.Furthermore, the curved front end functions as a fixing portion contact portion 25d that contacts the elastic member fixing portion 22 when the elastically deformable plate portion 24 is greatly elastically deformed. Even if a strong impact is applied to the elastically deformable plate portion 24 due to, for example, a collision or the like of the vehicle, the fixing portion contact portion 25d contacts the elastic member fixing portion 22, so that excessive deformation of the elastically deformable plate portion 24, that is, plastic deformation, can be suppressed. Note that the shape of the second elastic portion 24b is not limited to the illustrated example and may be, for example, an arc shape or an S shape.

[0048] As in Fig. 7 and Fig. As shown in Fig. 8, the elastic member fixing portion 22 includes a protruding portion 26 protruding from the main body portion 9 in the X direction, and a pair of restricting portions 27 provided at a front end of the protruding portion 26 in the protruding direction (X direction) of the protruding portion 26 and at both ends in the width direction (Y direction). Between the protruding portion 26 and the main body portion 9, a reinforcing rib 26a is provided, connecting the protruding portion 26 and the main body portion 9. The reinforcing rib 26a is provided to reinforce a portion with the lowest strength when a load is applied to the elastic member fixing portion 22. That is, a load acts on the elastic member fixing portion 22 in the direction of the axis L from the non-discharge side L2 to the discharge side L1.However, in this case, the most fragile portion with the lowest strength is a base portion of the protruding portion 26 on the non-discharge side L2. The reinforcing rib 26a is provided in this portion and is formed in a plate shape extending in a direction in which the load is applied (axis L direction). The pair of restricting portions 27 are formed on the surface of the protruding portion 26 on the discharge side L1 in the axis L direction, and a gap between the restricting portions 27 and this surface substantially corresponds to the thickness of the elastic member 21, thereby forming a gap G into which the elastic member 21 is inserted.Each of the restricting portions 27 includes a lateral restricting portion 27a protruding from the surface of the projecting portion 26 on the output side L1 toward the axis L direction, and a rear restricting portion 27b extending inward from the lateral restricting portion 27a along the Y direction. The lateral restricting portion 27a restricts the movement of the fixed plate portion 23 of the elastic member 21 inserted into the gap G toward the Y direction, and the rear restricting portion 27b restricts the movement of the fixed plate portion 23 in the axis L direction. Thus, the movement of the elastic member 21 is restricted to a direction intersecting an insertion direction of the fixed plate portion 23 inserted into the gap G (Y direction and the axis L direction), thereby fixing the elastic member 21 to the elastic member fixing portion 22.

[0049] Further, on the surface of the protruding portion 26 on the output side L1 in the direction of the axis L, the second engaging portion 26b is formed, which engages with the first engaging portion 23a formed on the fixed plate portion 23. The second engaging portion 26b has a so-called snap connection, and includes, on an upper side in the X direction, a guide surface 26d inclined with respect to the surface of the protruding portion 26 on the output side L1 in the direction of the axis L, and, on a lower side in the X direction, an engaging surface 26e substantially perpendicular to the surface of the protruding portion 26 on the output side L1 in the direction of the axis L.Also, when the fixed plate portion 23 is inserted into the gap G and the first engaging portion (opening portion) 23a engages with the engaging surface 26e, movement of the fixed plate portion 23 in the X direction can be restricted, and the fixed plate portion 23 can be prevented from coming off. Note that when the fixed plate portion 23 is inserted and fastened into the gap G, the boundary portion between the portion of the elastic member 21 held by the elastic member fastening portion 22 and the portion not held by the elastic member fastening portion 22 forms the above-mentioned first support point portion 25a.

[0050] A stepped portion 26c is formed at a front end in the X direction on the surface of the protruding portion 26 on the non-discharge side L2 in the direction of the axis L. The stepped portion 26c has a larger width (length in the Y direction) than the second elastic portion 24b of the elastically deformable plate portion 24. This allows the stepped portion 26c to function as a relief portion that prevents interference with the second elastic portion 24b of the elastically deformable plate portion 24, and thus, the moving range of the elastically deformable plate portion 24 can be expanded. In other words, the stepped portion 26c is located at a corner portion of the protruding portion 26 opposite the second elastic portion 24b, and when the elastically deformable plate portion 24 bends, the second elastic portion 24b does not contact this corner portion.Further, a receiving surface 26f is formed below the stepped portion 26c in the X direction, with which the fixing portion contact portion 25d of the elastically deformable plate portion 24 can contact, meaning that the fixing portion contact portion 25d does not contact the stepped portion 26c. This allows a sufficient range of rotation of the elastically deformable plate portion 24 to be ensured.

[0051] In the illustrated example, the elastic member 21 is fixed to the surface of the elastic member fixing portion 22 on the output side L1 in the direction of the axis L, however, it may also be fixed to the surface of the elastic member fixing portion 22 on the non-output side L2 in the direction of the axis L. Further, a fixing method is not limited to the illustrated snap-in type, but a screw, an adhesive, or the like may also be used. Furthermore, the elastic member 21 is not limited to the leaf spring, but may be any member that biases the protruding piece 132a of the mirror holder 132 toward the fixed support portion 30. For example, it may be another spring member such as a coil spring, or the elastic member 21 may be made of an elastic material such as rubber. (Fixed support section)

[0052] Next, with reference to Fig. 5 and additionally Fig. 9 to Fig. 11, a detailed structure of the fixed support portion 30 according to the present embodiment will be described. Fig. 9 is a schematic perspective view showing the fixed support portion 30 according to the present embodiment. Fig. 10 and Fig. 11 are a transparent side view and a transparent top view of the Fig. 5 shown movable element 6.

[0053] As in Fig. 9, the fixed support portion 30 includes a support main body portion 31, a pair of extension portions 32, 33, and a pair of arm portions 34, 35. The support main body portion 31 extends in the X direction, the pair of extension portions 32, 33 extend from one end portion of the support main body portion 31 in the direction of the axis L (moving direction of the movable member 6), and the pair of arm portions 34, 35 extend from both end portions of the support main body portion 31 in the Y direction substantially in the direction of the axis L.

[0054] On the support main body portion 31, a support projection 31a is formed, which projects toward the elastic support portion 20, which is opposite to the support main body portion 31 on the output side L1 in the direction of the axis L. The support projection 31a can support the protruding piece 132a of the mirror holder 132, which is biased by the elastic support portion 20. In addition, the support projection 31a is formed in a hemispherical shape. Thus, even if the inclination of the protruding piece 132a of the mirror holder 132 changes greatly due to the movement of the movable member 6, the protruding piece 132a can be supported equally. However, the support projection 31a is not limited to the illustrated shape; it is sufficient for the support projection 31a to have a curved front end.

[0055] The support main body portion 31 is held by covering at least upper surfaces 32a, 33a of the respective extension portions 32, 33 with the main body portion 9. This can reliably prevent the fixed support portion 30 from detaching in the X direction with respect to the main body portion 9.

[0056] Furthermore, the support main body portion 31 is held by covering a lower end portion 31b on the non-discharge side L2 in the axis L direction (portion on the opposite side of the extension portions 32, 33 in the axis L direction) with a holding-fixing portion 9a of the main body portion 9. Accordingly, detachment of the fixed support portion 30 in both the X direction and the axis L direction can be reliably prevented.

[0057] It should be noted that the guide hole 8 is formed in the main body portion 9, into which the guide shaft 5 is fitted for guiding the movement of the movable member 6. The pair of extension portions 32, 33 are arranged inside the main body portion 9 so as not to overlap with this guide hole 8. A recessed portion 31c is formed in the support main body portion 31. The recessed portion 31c and the guide hole 8 are arranged to overlap in the direction of the axis L. The pair of extension portions 32, 33 extend from a lower end portion of the support main body portion 31, which is bisected by the recessed portion 31c in the Y direction, to the direction of the axis L.Furthermore, the pair of extension portions 32, 33 are arranged parallel to the guide hole 8 on both sides in the Y direction of the guide hole 8 of the main body portion 9, and a part of the pair of extension portions 32, 33 is arranged to overlap with the guide hole 8 in the X direction. In this way, the extension portions 32, 33 can be effectively arranged even in a limited space, and an effect of preventing detachment of the fixed support portion 30 can be effectively exhibited. Note that only a single extension portion may be provided.

[0058] In the present embodiment, the front ends of the extension portions 32, 33 in the direction of the axis L reach up to the surface of the protruding portion 26 of the elastic support portion 20 on the non-discharge side L2, and the width of the extension portions 32, 33 in the Y direction (the length from one end portion to the other end portion in the Y direction) is equal to that of the support main body portion 31. Furthermore, the lower surfaces of the extension portions 32, 33 in the X direction reach up to the lower end of the guide hole 8. By arranging the extension portions 32, 33 in this way, a contact area with the main body portion 9 can be increased, and the fixed support portion 30 can be held more firmly. As a result, detachment of the fixed support portion 30 can be more reliably prevented.

[0059] A part of the pair of arm portions 34, 35 is embedded in the main body portion 9. This allows the contact area of ​​the fixed support portion 30 with the main body portion 9 to be further increased, whereby the fixed support portion 30 can be held even more firmly. For example, if the pair of arm portions 34, 35 are not provided, when excessive stress acts on the support main body portion 31 in the direction of the axis L, the stress may be concentrated on a base end portion (base portion exposed from the main body portion 9) 31d of the support main body portion 31, and the base end portion 31d may break. In contrast, in the present embodiment, the pair of arm portions 34, 35 are partially embedded in the main body portion 9, whereby the cross-sectional area of ​​the fixed support portion 30 along the upper surface of the main body portion 9 can be increased.As a result, the stress acting on the support main body portion 31 can be dispersed, whereby the resistance to the aforementioned stress can be improved.

[0060] It should be noted that the pair of arm portions 34, 35 extend obliquely with respect to the direction of the axis L, so that the distance between the arm portions 34, 35 decreases with increasing distance from the support main body portion 31. Therefore, even if the size of the main body portion 9 is limited, the formation of a portion in which the resin becomes thinner on the outer side of the pair of arm portions 34, 35 can be prevented. Furthermore, since the pair of arm portions 34, 35 extend obliquely, the pair of arm portions 34, 35 and the support main body portion 31 form a portion in which resin is sealed (in Fig. 11 (section shown by oblique lines), so the fixed support portion 30 and the main body portion 9 can be formed even more firmly together as one piece. However, the shape of the pair of arm portions 34, 35 is not limited to the illustrated shape. For example, if the size of the main body portion 9 is expandable in the Y direction and resin of a sufficient thickness can be secured on the outer side of the pair of arm portions 34, 35, the arm portions 34, 35 may extend parallel to the direction of the axis L.

[0061] In the present embodiment, the fixed support portion 30 is made of metal and fixed in the resin-made main body portion 9 by insert molding, but the material and fixing method of the fixed support portion 30 are not limited thereto. The material of the fixed support portion 30 may also be resin as long as it has higher strength than the main body portion 9, and as the fixing method, for example, a press-fitting method may also be used. (Mother unit)

[0062] Next, with reference to Fig. 12A and Fig. 12B, a detailed structure of the nut unit 40 used for the drive device 1 according to the present embodiment is described. Fig. 12A is a schematic side view showing the drive device 1 according to the present embodiment from a Fig. 4 opposite side, and Fig. 12B is an enlarged side view of an area shown in Fig. 12A is surrounded by a circle B. Fig. 13 is a schematic view for explaining the operation of the mother unit 40 according to the present embodiment.

[0063] The nut unit 40 includes a first nut member 41, a coil spring 42, and a second nut member 43, and is disposed in a groove-like nut arranging portion 11 formed in the main body portion 9. The first nut member 41 and the second nut member 43 are screwed to the lead screw 4, and the lead screw 4 extends inside the coil spring 42.

[0064] The first nut member 41 includes a flange portion 41a with a rectangular outer shape and a tubular portion 41b extending from the flange portion 41a in the direction of the axis L. A threaded portion screwed to the lead screw 4 is formed within the flange portion 41a and the tubular portion 41b. The second nut member 43 also includes a flange portion 43a with a rectangular outer shape and a tubular portion 43b extending from the flange portion 43a in the direction of the axis L. A threaded portion screwed to the lead screw 4 is formed within the flange portion 43a and the tubular portion 43b. The first nut member 41 and the second nut member 43 are arranged in the nut arrangement portion 11 such that the tubular portions 41b, 43b are opposite to each other.The flange portion 41a of the first nut member 41 is in contact with a pair of opposing ribs 12a, 12b protruding from an inner surface 11a of the nut locating portion 11. Note that, on the inner surface 11a of the nut locating portion 11, another pair of opposing ribs 13a, 13b is formed on the non-discharge side L2 of the first nut member 41 in the direction of the axis L, and this pair of opposing ribs 13a, 13b is provided to facilitate the positioning of the nut unit 40 (first nut member 41) and the movable member 6.

[0065] The coil spring 42 is interposed between the pair of opposing ribs 12a, 12b and the second nut member 43 in a compressed state. Therefore, the coil spring 42 contacts the pair of opposing ribs 12a, 12b at one of the end portions and biases the pair of opposing ribs 12a, 12b toward the non-discharge side L2 in the direction of the axis L, thereby bringing the pair of opposing ribs 12a, 12b into contact with the flange portion 41a of the first nut member 41. Further, the coil spring 42 contacts the flange portion 43a of the second nut member 43 at the other of the end portions and biases the flange portion 43a of the second nut member 43 toward the discharge side L1 in the direction of the axis L.Note that in the present embodiment, the additional pair of opposing ribs 13a, 13b is provided, whereby, when the nut unit 40 is arranged in the nut arrangement portion 11, the distance between the pair of opposing ribs 12a, 12b and the second nut member 43 can be prevented from becoming too small. Therefore, it is possible to prevent the coil spring 42 from being excessively compressed or the coil spring 42 from being separated from the tubular portion 41b of the first nut member 41.

[0066] The rotation of the first nut member 41 with respect to the main body portion 9 is restricted by the flange portion 41a contacting the inner surface 11a of the nut arranging portion 11. In other words, the inner surface 11a of the nut arranging portion 11 functions as a restricting portion that contacts the flange portion 41a of the first nut member 41 and restricts the rotation of the first nut member 41. Further, as described above, the first nut member 41 receives a biasing force (preload) toward the non-discharge side L2 in the direction of the axis L from the coil spring 42 via the pair of opposing ribs 12a, 12b, and the flange portion 41a is constantly in contact with the pair of opposing ribs 12a, 12b.For this reason, the first nut member 41 functions as a driving force transmitting portion that transmits a driving force of the drive unit 3 to the main body portion 9, and the pair of opposing ribs 12a, 12b functions as a driving force receiving portion that receives the driving force of the drive unit 3 from the first nut member 41. As a result, the main body portion 9 can be reciprocated along with the rotation of the lead screw 4 in the direction of the axis L.

[0067] The rotation of the second nut member 43 with respect to the main body portion 9 is restricted by the flange portion 43a contacting the inner surface 11a of the nut arranging portion 11. In other words, the inner surface 11a of the nut arranging portion 11 functions as a restricting portion that contacts the flange portion 43a of the second nut member 43 and restricts the rotation of the second nut member 43. On the other hand, the second nut member 43 is not supported by the main body portion 9 in the direction of the axis L and, as described above, receives a biasing force (preload) from the coil spring 42 toward the output side L1 in the direction of the axis L. Thus, the second nut member 43, together with the coil spring 42, functions as a preload applying portion and can, as shown in Fig. 13, exert a preload F in a direction in which the threaded portion of the first nut member 41 and the threaded portion of the second nut member 43 move away from each other.

[0068] By this preload F, when the movable member 6 moves through the first nut member 41, the threaded portion of the first nut member 41 can be continuously kept in contact with a non-output-side flank surface 4a of the lead screw 4. Furthermore, the threaded portion of the second nut member 43 can be brought into contact with an output-side flank surface 4b of the lead screw 4. As a result, the backlash (rebound) between the lead screw 4 and each of the nut members (threaded portions) can be absorbed, and chatter in the moving direction (axis L direction) of the movable member 6 can be suppressed.

[0069] It should be noted that, as described above, the coil spring 42 contacts the movable member 6 (the pair of opposed ribs 12a, 12b) with one end portion and contacts the second nut member 43 with the other end portion, and the movable member 6 contacts the flange portion 41a of the first nut member 41. Therefore, when the movable member 6 moves toward the output side L1 in the axis L direction, a thrust force of the first nut member 41 is transmitted to the movable member 6 via the flange portion 41a as a driving force, and when the movable member 6 moves toward the non-output side L2 in the axis L direction, the driving force is transmitted to the movable member 6 via the first nut member 41 by the biasing force of the coil spring 42.In this way, the movable member 6 can move both toward the output side L1 and toward the non-output side L2 in the direction of the axis L, and in both cases, as described above, rattling of the movable member 6 can always be suppressed by the one coil spring 42.

[0070] Incidentally, in the present embodiment, the nut arranging portion 11 accommodating the nut unit 40 opens not in a direction in which the main body portion 9 and the frame main body 2a oppose each other (X direction), but in a direction intersecting this direction (Y direction). This is particularly preferable in that the workability of arranging the nut unit 40 in the nut arranging portion 11 can be improved. That is, if the nut arranging portion 11 opens in the direction opposite to the frame main body 2a, the interior of the nut arranging portion 11 cannot be visually recognized due to the frame main body 2a, thereby making it difficult to accommodate the nut unit 40 in a proper arrangement in the nut arranging portion 11.On the other hand, in the present embodiment, when the nut unit 40 is accommodated inside the nut arranging portion 11, there is no interference from the rack main body 2a, whereby visual inspection is possible during arranging the nut unit 40 at an appropriate position, and a decrease in assembling efficiency can be suppressed.

[0071] As described above, in the present embodiment, the guide shaft 5 and the lead screw 4 are arranged to overlap in the X direction. The support portion 10 is arranged to overlap the guide shaft 5 and the lead screw 4 in the X direction. Therefore, the movement of the movable member 6 can be stabilized. In the present embodiment, further provided below the main body portion 9 are a pair of stoppers 9b, 9c (see Fig. 4 and Fig.8) for restricting the rotation of the main body portion 9, wherein the distance from the guide shaft 5 to each of the stoppers 9b, 9c can be made approximately equal. Therefore, rattling in the rotational direction of the movable member 6 can be suppressed as much as possible, and the movement of the movable member 6 can be stabilized.

[0072] In the present embodiment, the first nut member 41 and the second nut member 43 are both formed separately from the main body portion 9, however, forming them separately from the main body portion 9 is not necessarily required as long as the first nut member 41 can move integrally with the main body portion 9. That is, the first nut member 41 may be physically fixed to the main body portion 9 by a fixing agent such as an adhesive, or the first nut member 41 and the main body portion 9 are integrally formed, and the main body portion 9 itself includes an internal thread portion screwed to the lead screw 4.

[0073] The driving device described in the present embodiment can be used in a head-up display device for a vehicle.

[0074] In the present embodiment, a frame is provided that rotatably supports the lead screw on one side and the drive unit is attached to the other side, and the fixed support portion can be positioned on the other side of the movable member. Therefore, the mirror holder can pivot in constant contact with the fixed support portion. Furthermore, the first nut member and the fixed support portion are attached to the movable member, and it is optimal if the first nut member and the fixed support portion are arranged at substantially the same position in the axial direction of the lead screw.By adopting such an arrangement, in the driving device used in a head-up display device, rattling of respective important parts of the head-up display device can be absorbed or suppressed by the driving device, thereby eliminating the need to provide a separate rattling suppressing member in the head-up display device and thus simplifying the device as a whole. LIST OF REFERENCE SYMBOLS

[0075] 1... Driving device, 2... Rack, 2a... Rack main body, 2b, 2c... Support section, 3... Drive unit, 4... Lead screw, 5... Guide shaft, 6... Movable member, 8... Guide hole, 9... Main body section, 10... Support section, 11... Nut arrangement section, 11a... Inner surface, 12a, 12b... Opposing ribs, 20... Elastic support section, 21... Elastic member, 22... Elastic member fixing section, 23... Fixed plate section, 24... Elastically deformable plate section, 24a... First elastic section, 24b... Second elastic section, 25a... First support point section, 25c... Contact section for the projecting piece, 26... Projecting section, 26a... Reinforcing rib, 26b... Second engagement section, 26c... Stepped section, 27... Restriction section, 30... Fixed support section, 31... Support main body section, 31c... Recessed section, 32, 33... Extension section, 32a, 33a...Upper surface (of the extension portion), 34, 35... Arm portion, 40... Nut unit, 41... First nut member, 41a... Flange portion, 42b... Tubular portion, 42... Coil spring, 43... Second nut member, 43a... Flange portion, 43b... Tubular portion, 132a... Projecting piece (of the mirror holder), G... Gap.

Claims

[1] A drive device (1) comprising a drive unit (3), a lead screw (4) which is rotationally driven by the drive unit (3), and a movable element (6) which moves by a driving force of the drive unit (3), characterized by , that the movable element (6) has a main body portion (9), a drive force transmission portion which transmits the drive force of the drive unit (3) to the main body portion (9), and a preload application portion which is provided separately from the main body portion (9), the drive force transmission section comprises a first threaded section screwed to the lead screw (4) and moves the main body section (9) together with a rotation of the lead screw (4) in an axial direction of the lead screw (4) and the preload applying portion comprises a second threaded portion screwed to the lead screw (4) and applies a preload between the first threaded portion and the second threaded portion, wherein the movable element (6) has a support portion (30) supporting a supported element, and the support portion (30) comprises an elastic support portion for biasing the supported member and a fixed support portion provided opposite to the elastic support portion in a moving direction of the movable member (6) and supporting the supported member biased by the elastic support portion. [2] Drive device (1) according to claim 1, characterized by that the driving force transmission portion comprises a first nut element (41) and has the first threaded portion provided separately from the main body portion (9), the preload application section comprises a second nut element (43) having the second threaded portion and a preload element (42) provided between the first nut element (41) and the second nut element (43), in the main body portion (9) a nut arrangement portion (11) is formed in which the first nut element (41) and the second nut element (43) are arranged, and the first nut member (41) and the second nut member (43) are arranged in the nut arranging portion (11) in a state in which rotation with respect to the main body portion (9) is restricted. [3] Drive device (1) according to claim 2, characterized byin that a driving force receiving section (12a, 12b) is formed in the nut arrangement section (11), which receives a driving force of the drive unit (3) from the first nut element (41), and the first nut element (41) is prestressed by the prestressing element (42) via the driving force receiving section (12a, 12b). [4] Drive device (1) according to claim 3, characterized by that the prestressing element (42) is a helical spring, the lead screw (4) runs inside the coil spring, and the prestressing element (42) is arranged between the driving force receiving section (12a, 12b) and the second nut element (43). [5] Drive device (1) according to claim 4, characterized by that the first nut element (41) has a tubular portion in which the first threaded portion is formed, and a flange portion (41a), the flange portion (41a) touches the driving force receiving portion (12a, 12b), and a restricting portion is provided on the nut arranging portion (11) which restricts rotation of the first nut member (41) by contacting the flange portion (41a). [6] Drive device (1) according to claim 4 or 5, characterized by that the second nut member (43) has a tubular portion in which the second threaded portion is formed, and a flange portion (43a), and a restricting portion is provided on the nut arranging portion (11) which restricts rotation of the second nut member (43) by contacting the flange portion (43a). [7] Drive device (1) according to one of claims 2 to 6, comprising a frame (2) which rotatably supports the lead screw (4), characterized by , that the frame (2) has a plate-shaped frame main body which is opposite the main body section (9), and the nut arranging portion (11) opens to a direction intersecting a direction in which the main body portion (9) and the frame main body are opposed to each other. [8] Drive device (1) according to claim 7, characterized by that a guide shaft for guiding a movement of the movable element (6) is attached to the frame (2), the guide shaft is arranged parallel to the lead screw (4), the movable element (6) has a support portion which supports a supported element, and the support portion is provided on an opposite side of the lead screw (4), with the guide shaft arranged therebetween. [9] Drive device (1) according to claim 1, characterized bythat the elastic support portion comprises an elastic member that contacts the supported member and biases the supported member toward the fixed support portion, and an elastic member fixing portion that holds the elastic member, and the elastic member fixing portion is provided in the main body portion (9). [10] Drive device (1) according to claim 9, characterized by that the elastic element is a leaf spring. [11] Drive device (1) according to claim 10, characterized by that the elastic element comprises a fixed plate portion fixed to the elastic element fixing portion and an elastically deformable plate portion extending from an end portion of the fixed plate portion and being elastically deformable, wherein the elastically deformable plate portion has a first elastic portion extending from the end portion of the fixed plate portion and a second elastic portion extending from an end portion of the first elastic portion, and a contact portion is formed on the second elastic portion which contacts the supported member. [12] Drive device (1) according to one of claims 1 to 11, characterized by that the fixed support portion is formed from a material having a higher strength than the main body portion (9), and is partially embedded and fixed in the main body portion (9). [13] Drive device (1) according to claim 12, characterized by that the fixed support portion supports the supported element at a position opposite to the supported element in the direction of movement of the movable element (6). [14] Drive device (1) according to claim 13, characterized by in that the fixed support portion has a support main body portion extending in a direction intersecting the moving direction of the movable member (6) and an extending portion extending from an end portion of the support main body portion in the moving direction of the movable member (6), and at least a part of an upper surface of the extending portion is covered by the main body portion (9). [15] A driving device (1) used in a head-up display device, comprising a driving unit (3), a lead screw (4) rotationally driven by the driving unit (3), and a movable member (6) moving by a driving force of the driving unit (3), characterized by , that the movable element (6) comprises a main body portion (9), a drive force transmission portion which transmits the drive force of the drive unit (3) to the main body portion (9), a preload application portion which is provided separately from the main body portion (9), and a support portion (30) which pivotally supports a mirror holder for holding a concave mirror, wherein the drive force transmission section comprises a first threaded section screwed to the lead screw (4) and moves the main body section (9) together with a rotation of the lead screw (4) in an axial direction of the lead screw (4), and the preload applying portion comprises a second threaded portion screwed to the lead screw (4) and applies a preload between the first threaded portion and the second threaded portion, wherein the support portion (30) has an elastic support portion for preloading the mirror holder and a fixed support portion provided opposite the elastic support portion in the direction of movement of the movable element (6) and supporting the mirror holder preloaded by the elastic support portion, a first nut element (41) is provided separately from the main body portion (9), and a second nut element (43) having the second threaded portion and a prestressing element (42) provided between the first nut element (41) and the second nut element (43) which applies a prestress between the first threaded portion and the second threaded portion are provided, in the main body portion (9) a nut arrangement portion (11) is formed, in which the first nut element (41) and the second nut element (43) are arranged, wherein the first nut member (41) and the second nut member (43) are arranged in the nut arranging portion (11) in a state in which rotation with respect to the main body portion (9) is restricted, in the nut arrangement section (11) a driving force receiving section (12a, 12b) is formed, which receives a driving force of the drive unit (3) from the first nut element (41), and the first nut element (41) is prestressed by the prestressing element (42) via the drive force receiving section (12a, 12b). [16] Drive device (1) used in a head-up display device according to claim 15, characterized by that the concave mirror shines an indicator light onto a windshield of a vehicle. [17] Drive device (1) used in a head-up display device according to claim 15, comprising a frame (2) which rotatably supports the lead screw (4) on one side and on the other side of which the drive unit (3) is fastened, characterized by that the fixed support portion is positioned on the other side of the movable element (6). [18] Drive device (1) used in a head-up display device according to claim 17, characterized by that the mirror holder pivots in constant contact with the fixed support section. [19] Drive device (1) used in a head-up display device according to claim 18, characterized by that the first nut element (41) and the fixed support portion are fixed to the movable element (6), and the first nut element (41) and the fixed support portion are arranged at substantially the same position in the axial direction of the lead screw (4).

Images