JP2010230157A - Power transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmission device, suppressing occurrence of play (chatter) between components to allow highly accurate positioning. <P>SOLUTION: The power transmission device includes: a lead screw part 61c rotary driven along with drive of a driving member 61a; and a power transmission means 64 moved along an axial direction X of the lead screw part 61c by rotation of the lead screw part 61c to transmit power to a hanging part (power transmission object part) 42e. The power transmission means 64 includes: a body part 66 having a first receiving part 77 receiving a desired part of an outer peripheral part of the lead screw part 61c; a receiving member 67 having a second receiving part 67b receiving the other portion of the outer peripheral part; and an elastic connecting member 68 connecting and fixing the body part 66 with the receiving member 67 so that the lead screw part 61c is sandwiched between the first receiving part 77 and the second receiving part 67b. First and second screw parts 78, 67c screwed with the lead screw part 61c are respectively formed to the first and second receiving parts 77, 67b. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lead screw portion that is rotationally driven as the drive member is driven, and a power transmission member that moves along the axial direction of the lead screw portion by the rotation of the lead screw portion and transmits power to the driven force transmission portion ( Power transmission device).

  Conventionally, in this type of power transmission device, as described in Patent Document 1 below, for example, the angular position of the concave mirror (or the position where the liquid crystal display element is arranged) provided in the vehicle head-up display device is adjusted. Therefore, there is known one that adjusts the angle position of the concave mirror (or adjusts the arrangement position of the liquid crystal display element) by driving a stepping motor (drive member).

JP 2008-224791 A

  Hereinafter, a configuration example of the vehicle head-up display device in the case of adjusting the angular position of the concave mirror will be described. The head-up display device for a vehicle in such a configuration example mainly includes a display that emits display light, a reflector that reflects display light emitted from the display, and a housing that houses the display and the reflector. The display light reflected by the concave mirror provided in the reflector is projected (irradiated) onto the windshield of the vehicle through the emission part formed in the housing, and the display image (virtual image) obtained by this irradiation is displayed on the vehicle user ( It is made visible to the driver).

  In this case, the reflector includes a concave mirror that reflects display light from the display, a mirror holder made of a substantially flat synthetic resin that holds the concave mirror, and partially toward the outside of the mirror holder. A power transmission device capable of adjusting the angular position of the mirror holder by rotating the mirror holder about a predetermined rotation axis by transmitting power to the projecting piece which is a driven power transmission portion formed to project; Become.

  This power transmission device includes a stepping motor (driving member) that generates a rotational driving force when energized, a rotating shaft extending from the stepping motor, and a drive in which a lead screw portion that is a thread groove is formed on the circumferential surface of the rotating shaft. Means, a stepping motor fixedly supported in a stationary state, and at the same time, a metal support having a substantially U-shaped cross section that pivotally supports the tip of the lead screw part, and a predetermined portion of the lead screw part screwed into the annular inner peripheral surface A nut having a screw thread portion and reciprocating along the axial direction of the lead screw portion by a thrust applied by rotation of the lead screw portion, and a guide fitted to the support so as to be parallel to the lead screw portion A pair of abutment surfaces are formed on the shaft and a base portion which is a base portion, respectively abutting both side surfaces of the nut. Formed by mainly configured from a pair of opposing walls made of hemispherical sandwiching the projecting pieces of the mirror holder to a pair of power projections are formed transmission member protruding towards (power transmitting means).

  In the power transmission device configured as described above, when the lead screw part is rotationally driven with the driving of the stepping motor, the nut screwed to the lead screw part by the rotation of the lead screw part reciprocates along the axial direction. In synchronism with the reciprocating movement of the nut, for example, the one side surface of the both side surfaces of the nut has the one contact surface portion on the side contacting the one side surface in the pair of contact surfaces. Thrust acts.

  By the action of the thrust, the power transmission member is moved (reciprocated) along the axial direction in synchronization with the reciprocating movement of the nut while being guided by the guide shaft. Then, with the movement of the power transmission member, a mirror holder is centered on the rotation axis on the protruding piece (powered transmission portion) sandwiched between the pair of protrusions provided in the power transmission member. Power to be rotated is transmitted.

  This means that the mirror holder and the concave mirror held by the mirror holder are rotated by a predetermined angle about the rotation axis by power transmission to the protruding piece. And the projection direction of the display light to the windshield is adjusted by moving the concave mirror in this way, and accordingly the position of the display image visible to the driver is moved in the vertical direction of the windshield. It becomes possible to do.

  In the case of the above-described head-up display device for a vehicle, the screw screwed into the lead screw portion is driven by rotating the lead screw portion in accordance with the driving of the stepping motor as a driving member in order to adjust the angular position of the concave mirror. A threaded portion (that is, a nut) is reciprocated along the axial direction of the lead screw portion.

  Then, by this reciprocating movement of the nut, the power transmission member which is guided by the guide shaft and the pair of contact surfaces abut on the nut (the pair of side surfaces) respectively moves along the axial direction. Thus, power is transmitted to the projecting piece of the mirror holder sandwiched between the pair of projecting parts provided in the power transmission member so as to rotate the mirror holder about the rotational axis. Accordingly, the angular position of the mirror holder (the concave mirror) is adjusted.

  However, when adjusting the angular position of the concave mirror in this way, the nut (the screw threaded portion) is screwed with a predetermined portion of the lead screw portion made of a screw groove, and the nut (both side surfaces) is the pair of pairs. When the power transmission member is guided by the guide shaft so as to be sandwiched between the contact surfaces, a meshing portion between the screw threaded portion formed on the nut and the lead screw portion, and the nut (both the both sides And a pair of contact surfaces provided on the power transmission member inevitably cause manufacturing play (so-called play) due to dimensional tolerances between components.

Therefore, minimizing the occurrence of such play in the meshing portion and the connecting portion is an important matter for operating the power transmission device (that is, for angularly moving the concave mirror). Therefore, it has been desired to provide a power transmission device capable of suppressing the occurrence of the play and adjusting the angular position of the concave mirror with high accuracy.
Accordingly, the present invention is directed to providing a power transmission device capable of suppressing the occurrence of play (backlash) between parts and performing highly accurate position adjustment in order to deal with the above-described problems. is there.

  The present invention relates to a lead screw portion that is rotationally driven as the drive member is driven, and a power transmission means that moves along the axial direction of the lead screw portion by the rotation of the lead screw portion and transmits power to the driven force transmission portion. The power transmission means includes a main body having a threaded portion that engages with a required portion of the outer peripheral portion of the lead screw portion, and the outer peripheral portion different from the required portion of the outer peripheral portion. A receiving portion that receives the other portion, and an elastic connecting member that is connected and fixed to the main body portion so as to sandwich the lead screw portion between the screwing portion and the receiving portion. Features.

  The present invention also provides a lead screw portion that is rotationally driven as the drive member is driven, and a power transmission that moves along the axial direction of the lead screw portion by the rotation of the lead screw portion and transmits power to the driven transmission portion. The power transmission means includes a main body portion having a first receiving portion for receiving a required portion of the outer peripheral portion of the lead screw portion, and the required portion of the outer peripheral portion is different from the required portion of the outer peripheral portion. A receiving member having a second receiving portion for receiving another portion of the outer peripheral portion; and the main body portion and the receiving member so as to sandwich the lead screw portion between the first receiving portion and the second receiving portion. And a connecting member having elasticity for connecting and fixing, and at least one of the first receiving portion and the second receiving portion is formed with a screwing portion to be screwed into the lead screw portion. You .

  Further, according to the present invention, the main body portion is formed with an insertion portion for inserting a guide shaft that is substantially in parallel with the lead screw portion, and the guide shaft is the lead screw when viewed from the axial direction side. It is arranged on the upper side of the part.

  Further, the present invention is characterized by comprising a metal support that fixes and supports the drive member, and a vibration isolation member that is fixed to a predetermined exterior case so as to support the support.

  The present invention also provides a metal support that fixes and supports the drive member, a metal frame that is fixed to a predetermined exterior case so as to support the support, the support, and the frame. And an anti-vibration member interposed therebetween.

  ADVANTAGE OF THE INVENTION According to this invention, the initial objective can be achieved, the generation | occurrence | production of the play (play) between components can be suppressed, and the power transmission device which can perform a highly accurate position adjustment can be provided.

1 is a schematic view of a head-up display device according to a first embodiment of the present invention. Sectional drawing of the display apparatus by the embodiment. The perspective view which shows the 2nd reflector by the same embodiment. Sectional drawing which shows the 2nd reflector by the same embodiment, and the required part of a housing. The expanded sectional view which expands and shows the A section in FIG. The perspective view which shows each part of the power transmission device by the same embodiment, and a part of holding member. Sectional drawing which shows the power transmission means in the direction orthogonal to the axial direction of the lead screw part by the same embodiment, a lead screw part, and a guide shaft. Sectional drawing which shows the power transmission means in the direction orthogonal to the axial direction of the lead screw part by the modification of the embodiment, a lead screw part, and a guide shaft. The perspective view which shows a part of each part and holding member of the power transmission device by 2nd Embodiment of this invention.

(First Embodiment) An embodiment in which the power transmission device of the present invention is applied to a second reflector provided in a head-up display device for a vehicle will be described below with reference to FIGS.

  As shown in FIG. 1, the head-up display device uses the windshield 13 of the vehicle 10 that is a projection member to project the display light L that is projected by the display device 12 that is a display unit disposed inside the instrument panel 11 of the vehicle 10. The virtual image V is displayed by reflecting in the direction of the driver (user) 14 of the vehicle 10. In other words, the head-up display device irradiates (projects) the display light L emitted from a liquid crystal display (to be described later) of the display device 12 onto the windshield 13 and uses a display image (virtual image) V obtained by the irradiation. It is made to be visually recognized by the person 14. Thereby, the user 14 can observe the virtual image V superimposed on the landscape.

  As shown in FIG. 2, the display device 12 mainly includes a liquid crystal display 20, a first reflector 30, a second reflector 40, and a housing 50.

  The liquid crystal display 20 has a light source 21 formed of a light emitting diode mounted on the wiring board R and a front side (directly above) the light source 21 so as to transmit the illumination light from the light source 21 and form the display light L. It is mainly composed of a TFT-type liquid crystal display element (display element) 22 positioned. This means that the light source 21 is disposed behind (directly below) the liquid crystal display element 22, and the liquid crystal display element 22 displays predetermined information (information to be described later) by the light emitted from the light source 21. I mean. The liquid crystal display 20 is provided in the housing 50 such that the surface on the emission side of the display light L faces a cold mirror (to be described later) of the first reflector 30, and the optical axis of the display light L is on the cold mirror. Fixed and held at a crossing position and orientation.

  Further, the liquid crystal display element 22 emits and displays information (for example, the speed of the vehicle and the engine speed) to be displayed by an element driving circuit (not shown) by numerical values. The liquid crystal display 20 outputs display light L composed of light in the visible wavelength range. For example, a light source 21 that emits red light (mainly emission wavelength range of 610 to 640 nm) can be applied. Needless to say, the information to be displayed is not limited to the speed of the vehicle and the engine speed, and any display form can be adopted.

  The first reflector 30 includes a cold mirror 31 and an attachment member 32 for attaching and fixing the cold mirror 31 using predetermined attachment means. The cold mirror 31 includes a substantially rectangular glass substrate 31a and a first reflective layer 31b formed on one surface of the glass substrate 31a (a surface facing a concave mirror described later of the second reflector 40). . The first reflective layer 31b is composed of multilayer interference films having different film thicknesses, and is formed by a method such as vapor deposition. The cold mirror 31 is disposed in an inclined state at a position where the display light L emitted from the liquid crystal display 20 is reflected to the second reflector 40 (the concave mirror) side.

  The cold mirror 31 reflects light in the visible wavelength range (450 to 750 nm) including the emission wavelength range of the liquid crystal display 20 with a high reflectance (for example, 80% or more), and lowers light outside the visible wavelength range. It reflects with reflectivity. In this case, a cold mirror 31 that reflects light in the infrared wavelength region other than the visible wavelength region (infrared rays or heat rays of sunlight) with a low reflectance (for example, 15% or less) is applied. The light that is not reflected by the first reflective layer 31 b is configured to pass through the cold mirror 31.

  In the case of the present embodiment, the cold mirror 31 and the liquid crystal display 20 are arranged at a position where they cannot directly face a translucent cover (to be described later) of the housing 50, and light from outside such as sunlight (external light). Is a structure that does not directly hit. The attachment member 32 is made of, for example, a black synthetic resin material and is fixed to the housing 50.

  As shown in FIGS. 2 to 4, the second reflector 40 includes a concave mirror (reflecting member) 41 that reflects the display light L from the cold mirror 31 (that is, the liquid crystal display element 22), and a mirror holder that holds the concave mirror 41. (Holding member) 42 and a power transmission device for transmitting power to a later-described hanging portion (powered transmission portion) provided in the mirror holder 42 in order to adjust the angular position (arrangement position) of the mirror holder 42 43.

  The concave mirror 41 is formed by vapor-depositing a second reflective layer 41a on a resin substrate made of polycarbonate having a concave surface. The concave mirror 41 is disposed in an inclined state at a position where the second reflective layer 41a faces the cold mirror 31 and the translucent cover and faces the translucent cover.

  The concave mirror 41 is for reflecting (projecting) the display light L from the cold mirror 31 toward the translucent cover (the windshield 13 of the vehicle 10). This means that the concave mirror 41 enlarges the display light L reflected by the cold mirror 31 and projects the enlarged display light L onto the windshield 13 through the translucent cover.

  The mirror holder 42 is made of a synthetic resin material, and includes a shaft portion 42 a having a substantially cylindrical shape that is pivotally supported by a bearing portion (not shown) provided in the housing 50. The mirror holder 42 includes a holding portion 42 b that is a wall portion for holding the concave mirror 41. In this case, it is assumed that the concave mirror 41 is fixedly held to the holding portion 42b with a double-sided adhesive tape (not shown) interposed between the concave mirror 41 and the holding portion 42b. Further, the mirror holder 42 and the concave mirror 41 held by the mirror holder 42 are configured to be angularly movable (rotatable) about the rotation axis RA that is the central axis of the shaft portion 42a.

  Reference numeral 42c denotes a protruding piece formed in a substantially L shape from the back of the concave mirror 41 toward the second reflecting layer 41a side below the concave mirror 41. The protruding piece 42c is formed with a tongue piece 42d. And a hanging part 42e which is a driven part, and is formed integrally with the mirror holder 42.

  In FIG. 4, the tongue piece 42d extends from the bottom surface portion 42f constituting the bottom wall of the holding portion 42b of the mirror holder 42 toward the second reflective layer 41a (in other words, the lead screw portion described later). It consists of a substantially rectangular flat plate (extending along a substantially axial direction).

  The hanging portion 42e, which is a driven force transmission portion, is a substantially rectangular flat plate-like standing wall portion continuously formed on the tongue piece 42d so as to hang downward (from the lead screw portion side) from the tip portion of the tongue piece 42d. Consists of. The drooping portion 42e is configured such that both surfaces 42g and 42h (see FIG. 4) are in point contact with a pair of first and second protrusions of a power transmission unit (described later) provided in the power transmission device 43. Sandwiched by the first and second protrusions.

  As shown in FIGS. 3 to 7, the power transmission device 43 is mainly composed of a driving means 61, a support body 62, a guide shaft 63, a power transmission means 64, and a vibration isolation member 65, and the mirror holder 42. Is rotated around the rotation axis RA to adjust the angular position of the mirror holder 42 (concave mirror 41) (in other words, the projection direction of the display light L is adjusted).

  The driving means 61 includes a stepping motor (driving member) 61a that is a well-known PM type stepping motor that generates a rotational driving force when energized, and a rotating shaft 61b extending from the stepping motor 61a. In this case, the rotation shaft 61b is formed of a screw groove formed in a spiral shape on the peripheral surface thereof, and includes a lead screw portion 61c that is rotationally driven in accordance with the driving of the stepping motor 61a. In other words, the lead screw portion 61c (rotating shaft 61b) is rotated by receiving the rotational driving force from the stepping motor 61a.

  The support body 62 is formed of a metal motor case that fixes and supports the stepping motor 61a in an immobile state, is formed in a substantially U-shaped cross section, and is a substantially plate that is disposed along the axial direction X of the lead screw portion 61c. And a pair of first and second flange portions 62b, 62c formed by bending both ends of the flat plate portion 62a along the axial direction X so as to correspond to the stepping motor 61a, Have

  The first flange portion 62b positioned on the stepping motor 61a side is fitted with a through hole 62d through which an end portion (terminal portion) 61d of the lead screw portion 61c passes and one end portion of the guide shaft 63. 1 fitting hole 62e is formed. The first flange portion 62b and the required portion of the stepping motor 61a are fixed to each other by a predetermined mounting means, whereby the stepping motor 61a is fixedly supported by the support body 62 in an immobile state. Become.

  On the other hand, on the side of the second flange portion 62c that forms a pair with the first flange portion 62b, a hole (not shown) corresponding to the through hole 62d, a first fitting hole 62e, and a guide shaft 63 are provided. A second fitting hole 62f into which the other end is fitted is formed. A bearing member G is mounted in the hole provided in the second flange portion 62c. Then, the tip 61e portion of the lead screw portion 61c located on the tip side of the projecting portion that penetrates the through hole 62d and projects to the bearing member G side is rotatably supported through the bearing member G.

  Reference numerals 62g and 62h are provided at positions corresponding to first and second screw holes, which will be described later, of the vibration isolation member 65, and screw portions of the screws S1 penetrating the first and second screw holes are screwed together. It is the 1st, 2nd screwing part for making it do. The first and second screw threaded portions 62g and 62h are formed so as to protrude in a substantially cylindrical shape on the surface side of the flat plate portion 62a on both ends of the flat plate portion 62a. Specifically, the first screw A screwing portion 62g is provided in the vicinity of the first flange portion 62b, and a second screw screwing portion 62h is provided in the vicinity of the second flange portion 62c.

  The guide shaft 63 is made of, for example, an elongated cylindrical metal material, and one end portion of the guide shaft 63 has a first fitting hole 62e of the support body 62 so as to be substantially parallel to the lead screw portion 61c (rotating shaft 61b). And the other end is fitted into the second fitting hole 62 f of the support 62.

  In the case of the present embodiment, in a state where the lead screw portion 61c (rotating shaft 61b) and the guide shaft 63 are viewed from the axial direction X side (that is, the state shown in FIG. 7), the main body portion (base portion) described later is provided. In FIG. 7, the guide shaft 63 is disposed on the right side of the rotation shaft 61b so as to be separated from the lead screw portion 61c (the rotation shaft 61b) by a predetermined distance in a direction orthogonal to the longitudinal direction of the second leg portion.

  In the longitudinal direction of the second leg portion, the guide shaft 63 is disposed on the upper side (front side) of the lead screw portion 61c (rotating shaft 61b). That is, this means that in FIG. 7, the first virtual horizontal line Y1 passing through the center point P of the guide shaft 63 is the second virtual horizontal line Y2 passing through the center point Z of the lead screw portion 61c (rotating shaft 61b). It means that it is the structure located in the upper side (namely, the 1st guide part side with which the connection member mentioned later is equipped).

  The power transmission means 64 includes a main body portion 66, a receiving member 67, and a connecting member 68 having elasticity for connecting and fixing the main body portion 66 and the receiving member 67. The main body portion 66 is made of a synthetic resin material such as polyacetal, and has a base 71 having a substantially inverted concave shape constituting the base, and a pair of protrusions formed so as to face each other upward from the surface of the base 71. First and second opposing walls 81 and 82 are provided.

  The base portion 71 includes a mounting portion 72 formed by mounting the first and second opposing walls 81 and 82, and first and second leg portions that are formed to hang downward from both ends of the mounting portion 72. The insertion portion 75 is formed in the mounting portion 72 so as to extend along the axial direction X. The insertion portion 75 is a substantially circular through hole through which the guide shaft 63 is inserted.

  In addition, 72a is a first positioning portion formed of a substantially cylindrical protrusion formed at a position corresponding to a second positioning hole described later of the connecting member 68. The first positioning portion 72a is a first positioning portion 72a. Among the second leg portions 73 and 74, the second leg portions 73 and 74 are provided on one side surface portion of the mounting portion 72 on the front side in FIG.

  Further, the mounting portion 72 is formed with a second positioning portion 76 made of a substantially rectangular protrusion at a position corresponding to a first positioning hole, which will be described later, of the connecting member 68, and on the bottom surface of the mounting portion 72. A first receiving portion 77 formed of a concave curved surface portion that receives a required portion of the outer peripheral portion of the lead screw portion 61c is continuously formed linearly along the axial direction X (see FIG. 5).

  In this example, the length dimension in the axial direction X of the first receiving portion 77 located on the upper side of the lead screw portion 61c is set to about 1 cm, and the first receiving portion 77 having such a 1 cm width is set. However, it is the structure which receives the required part of the upper side R surface outer peripheral part corresponding to an upper side R surface among the said outer peripheral parts of the lead screw part 61c. The first receiving portion 77 includes a screw portion that meshes (screws) with the lead screw portion 61c (a required portion of the outer peripheral portion of the upper R surface) so as to correspond to the first receiving portion 77. A first screwing portion 78 that is a screwing portion is provided.

  On the other hand, of the first and second leg portions 73 and 74, the first leg portion 73 located on the near side in FIG. 6 has the receiving member 67 as the first leg portion 73 and the second leg portion 74. A rectangular window portion 73a formed so as to be led in between and a frame portion 73b surrounding the window portion 73a, and a bottom wall portion of the frame portion 73b located on the lower end side of the frame portion 73b Is provided with a first stopper portion 73c composed of a convex portion protruding toward the support body 62 (flat plate portion 62a).

  In addition, 74a is the 2nd stopper part formed in the 2nd leg part 74 located in the back | inner side in FIG. 6 (in other words, it is located in the right side in FIG. 7). Similarly to the first stopper portion 73c, the second stopper portion 74a includes a convex portion that is formed to protrude toward the support body 62 (flat plate portion 62a).

  The first and second stopper portions 73c and 74a are lead screw portions whose main body portion 66 is in a direction different from the axial direction X when the main body portion 66 guided by the guide shaft 63 moves in the axial direction X. When the first stopper part 73c or the second stopper part 74a is brought into contact with the surface of the flat plate part 62a of the support body 62 when rotated along the outer peripheral direction of 61c, The lead screw portion 61c has a function of preventing excessive rotation in the outer circumferential direction.

  In addition, the first and second opposing walls 81 and 82 have a pair of first and second walls that are in point contact with the hanging portions 42e (both surfaces 42g and 42h) of the projecting piece 42c of the mirror holder 42 on the tip side. Second protrusions 83 and 84 are formed.

  The first and second protrusions 83 and 84 have a substantially hemispherical shape, and sandwich the hanging portion 42e so as to make point contact with both surfaces 42g and 42h of the hanging portion 42e at the apex portion thereof. In other words, the first protrusion 83 and the second protrusion 84 are disposed to face each other with a predetermined gap, and the first and second protrusions 83 and 84 and both surfaces 42g and 42h are disposed in the gap. And the drooping portion 42e intervene so that they are in point contact with each other.

  Further, in the vicinity of the boundary between the base portion 71 which is the lower end side of the first and second opposing walls 81 and 82 and the first and second opposing walls 81 and 82, the first positioning portion 72a and the second positioning portion are provided. A pair of first and second flange portions 85 and 86 are formed in a flange shape so as to face each other with a predetermined gap between the portions 76. And between these 1st, 2nd collar parts 85 and 86 and the base 71, the 1st to-be-guided part H1 which consists of a micro gap part which can guide the below-mentioned 1st guide part of the connection member 68 is demonstrated. Is provided.

  The receiving member 67 is made of a synthetic resin material such as polyacetal similarly to the main body portion 66, and is formed in a substantially rectangular parallelepiped shape. The front surface portion 67a located on the lead screw portion 61c side has the outer periphery of the lead screw portion 61c. A second receiving portion 67b is formed along the axial direction X. The second receiving portion 67b is a concave curved surface portion that receives another portion of the outer peripheral portion different from the required portion of the portion.

  In this example, the length dimension in the axial direction X of the second receiving portion 67b located below the lead screw portion 61c is set to about 0.5 mm, and the second width having the width of 0.5 mm is set. The second receiving portion 67b is configured to receive a required portion of the lower R surface outer peripheral portion which is the opposite side of the upper R surface outer peripheral portion. The second receiving portion 67b includes a screw portion that meshes (screws) with the lead screw portion 61c (a required portion of the outer peripheral portion of the lower R surface) so as to correspond to the second receiving portion 67b. The 2nd screwing part 67c which is the screwing part which becomes is provided.

  The second threaded portion 67c is formed in a second receiving portion 67b provided as a concave curved surface portion that receives a required portion of the outer peripheral portion of the lower R surface of the lead screw portion 61c. In this example, the second screwing portion 67c (second receiving portion 67b) is located on the front surface portion 67a facing the substantially central region in the required portion of the outer peripheral portion of the upper R surface across the lead screw portion 61c. (See FIG. 5).

  On the other hand, a pair of slits 67d and 67e are arranged along the direction substantially perpendicular to the axial direction X on the back surface of the receiving member 67 on the side opposite to the front surface portion 67a, and between the pair of slits 67d and 67e. The elastic member 67g which has the hook part 67f fitted to the fitting hole mentioned later of the connection member 68 is provided (refer FIG. 7). In this case, the hook portion 67f is formed of a claw portion that is formed at the free end portion (tip portion) of the elastic piece 67g formed in a cantilever shape and protrudes toward the front surface portion 67a.

  H2 is a second guided portion that guides a second guide portion described later of the connecting member 68. The second guided portion H2 includes a front surface portion 67a and the back surface of the receiving member 67. A part of the side surface of the receiving member 67 located between them is partially penetrated, and is formed of a hollow part for guiding the second guide part. In this example, the main body portion 66 and the receiving member 67 are formed as separate members, but the main body portion 66 and the receiving member 67 can be integrally formed.

  The connecting member 68 is made of a metal material having elasticity formed in a substantially “U” shape, and serves as a fixing member for connecting and fixing the main body 66 and the receiving member 67 formed of different members. A thin plate-shaped first guide that has a function and is guided (guided) in a first guided portion H1 formed between the base 71 and the first and second flange portions 85 and 86. A portion 68a, a thin plate-like second guide portion 68b guided (guided) by a second guided portion H2 provided on the receiving member 67, a first guide portion 68a, and a second guide portion 68b. And a thin plate-like connecting portion 68c to be connected.

  The first guide portion 68a is formed with a first positioning hole 68d having a substantially rectangular shape in which the second positioning portion 76 provided in the main body portion 66 (the mounting portion 72 of the base portion 71) is positioned. The second guide portion 68b is formed with a substantially rectangular fitting hole 68e that fits with the hook portion 67f of the receiving member 67 when the second guide portion 68b is inserted into the second guided portion H2. The connecting portion 68c is formed with a substantially circular second positioning hole 68f in which the first positioning portion 72a provided in the main body portion 66 (the mounting portion 72 of the base portion 71) is positioned.

  Here, an example of the assembly of the main body 66, the receiving member 67, and the connecting member 68 will be described. First, the first guide portion 68a of the connecting member 68 is positioned above the receiving member 67, and the second guide portion 68b of the connecting member 68 and the second guided portion H2 provided on the receiving member 67 are provided. The receiving member 67 and the connecting member 68 are aligned so as to face each other.

  Next, when the second guide portion 68b is inserted into the second guided portion H2, the second guide portion 68b is bent so that the tip of the second guide portion 68b bends the hook portion 67f downward in FIG. Then, the hook portion 67f is fitted into the fitting hole 68e so that the hook portion 67f is restored to its original position by its own restoring force, and the receiving member 67 is connected to the connecting member 68. It will be in the state fixed by fitting to.

  Next, from this state, the first guide portion 68a and the first guided portion H1 provided in the receiving member 67, the first positioning portion 72a provided in the mounting portion 72, and the second positioning hole of the connecting member 68 are provided. The main body 66 and the receiving member 67 to which the connecting member 68 is attached are aligned so that the window portion 73a of the first leg 73 and the receiving member 67 face each other.

  Finally, from this state, when the first guide portion 68a is guided to the first guided portion H1, the receiving member 67 supported by the second guide portion 68b passes through the window portion 73a and passes through the window portion 73a. The first guide is disposed between the first leg portion 73 and the second leg portion 74, and the tip portion of the first guide portion 68 a passes through the first and second flange portions 85 and 86. The part 68a is pushed into the second leg 74 side.

  Then, the second positioning portion 76 provided in the placement portion 72 is positioned in the first positioning hole 68d of the first guide portion 68a, and the first positioning portion 72a provided in the placement portion 72 is connected to the connection portion. When positioned in the second positioning hole 68f of 68c, an upward elastic force from the second guide portion 68b having elasticity acts on the second screwing portion 67c (second receiving portion 67b). Then, due to the upward elastic force, the first screwing portion 78 (first receiving portion 77) provided in the main body portion 66 (base portion 71) and the second screwing portion 67c (secondly provided in the receiving member 67). As a result, the assembly of the three members is completed.

  The vibration isolation member 65 is formed of an elastic material made of a rubber material (for example, silicon rubber) or a soft synthetic resin material (for example, polypropylene resin), and is provided with a substantially rectangular flat plate provided so as to correspond to the flat plate portion 62a of the support body 62. The flat part 65a of shape is provided. The vibration isolating member 65 has a vibration attenuating function for attenuating vibration generated when the stepping motor 61 a is driven from the support 62 to the housing 50 that is an outer case of the display device 12.

  Of the four corners of the flat portion 65a of the vibration isolation member 65, the first corner portion C1 provided at a position corresponding to a first boss portion described later of the housing 50 has a first ear portion 65b. Is formed so as to protrude to the side of the flat portion 65a so as to have substantially the same thickness as that of the flat portion 65a. In addition, a second ear portion 65c is flat on the second corner portion C2 provided in a position diagonal to the first corner portion C1 and corresponding to a second boss portion described later of the housing 50. The flat portion 65a is formed so as to protrude laterally so as to have substantially the same thickness as that of the portion 65a.

  Note that 65d and 65e are provided so as to communicate with the first and second screw threaded portions 62g and 62h of the support body 62, respectively, for allowing the screw portion of the screw S1 to penetrate from the back side of the flat portion 65a. The first and second screw holes 65d and 65e are located on both ends of the flat portion 65a, and the first screw hole 65d is the first screw hole 65d. 1 is provided on the flange portion 62b side, and the second screw hole 65e is provided on the second flange portion 62c side.

  Then, as shown in FIG. 4, the vibration isolation member 65 and the support 62 are fixed by allowing the screw portion of the screw S1 to pass through the first and second screw holes 65d and 65e from the back side of the flat portion 65a, respectively. The required portions of the screw portion of the screw S1 passing through the screw holes 65d and 65e are respectively screwed into the first and second screw screw portions 62g and 62h, thereby completing the process.

  In addition, 65f is provided so that it may connect with the below-mentioned 3rd screwing part provided in the said 1st boss | hub part, and the through-hole for penetrating the screw part of screw S2 from the surface side of the flat part 65a The third screw hole 66f is formed at a predetermined location of the first ear portion 65b.

  Similarly, 65g is provided so as to communicate with a later-described fourth screw threaded portion provided in the second boss portion, and a through hole for allowing the screw portion of the screw S2 to penetrate from the surface side of the flat portion 65a. The fourth screw hole 65g is formed at a predetermined location of the second ear portion 65c.

  In the power transmission device 43 configured as described above, when the lead screw portion 61c is driven to rotate in accordance with the driving of the stepping motor 61a, the first screwing engaged with the lead screw portion 61c by the rotation of the lead screw portion 61c. The portion 78 (that is, the main body portion 66) reciprocates along the axial direction X. At this time, the receiving member 67 is connected and fixed to the main body portion 66 via the connecting member 68 while receiving the upward elastic force, so that the first screwing portion 78 in the axial direction X is configured. The second threaded portion 67c provided on the receiving member 67 in conjunction with the movement is also movable along the axial direction X.

  Here, for example, when the main body portion 66 is translated along the axial direction X toward the first flange portion 62b side in the state of being guided by the guide shaft 63, the main body portion 66 and the connection are connected. Along with the parallel movement of the receiving member 67 connected to the main body 66 via the member 68, the mirror holder 42 is attached to the hanging portion 42e interposed between the first and second protrusions 83 and 84 in the main body 66. Power is transmitted to rotate the. This means that the mirror holder 42 rotates in the direction of the arrow in FIG. 4 about the rotation axis RA by power transmission to the hanging portion 42e.

  In addition, when the main-body part 66 and the receiving member 67 move to the 2nd flange part 62c side instead of the 1st flange part 62b side, the main-body part 66 and the receiving member 67 move to the 2nd flange part 62c side. Thus, the suspending portion 42e is acted upon by a power that rotates the mirror holder 42 about the rotation axis RA in the direction opposite to the arrow direction in FIG.

  The housing 50 is formed by, for example, aluminum die casting, and includes an upper case body 51 and a lower case body 52 both having a substantially concave shape in cross section, and is formed by the upper case body 51 and the lower case body 52. In the space 53 which is an internal space, the liquid crystal display 20, the first reflector 30, and the second reflector 40 are accommodated (see FIG. 2).

  The upper case body 51 is formed with an opening window 51a that opens at the upper part (the windshield 13 side of the vehicle 10) where the concave mirror 41 is disposed. The opening window 51a includes an opening window 51a. A light-transmitting cover 54 that is an emission part is disposed so as to be closed.

  The translucent cover 54 is made of a translucent synthetic resin material (for example, acrylic resin) and has a function as a light transmissive member that transmits (passes) the display light L reflected by the concave mirror 41. . That is, the display light L reflected by the concave mirror 41 is projected onto the windshield 13 through the translucent cover 54 formed on the housing 50, whereby the virtual image V is displayed.

  On the other hand, as shown in FIG. 4, a pair of first and second boss portions 52a and 52b having a substantially cylindrical shape projecting from the bottom portion toward the vibration isolation member 65 side are provided at the bottom portion of the lower case body 52. It is provided.

  Among these, the 1st boss | hub part 52a is provided with the 3rd screw screwing part 52c for screwing the screw S2, and this 3rd screw screwing part 52c is provided in the vibration proof member 65. The third screw hole 65f communicates with the third screw hole 65f. On the other hand, the second boss portion 52b includes a fourth screw screw portion 52d for screwing the screw S2, and the fourth screw screw portion 52d is provided in the vibration isolation member 65. It communicates with the fourth screw hole 65g.

  The vibration isolation member 65 and the housing 50 (the boss portions 52a and 52b) are fixed by allowing the screw portion of the screw S2 to pass through the third and fourth screw holes 65f and 65g from the surface side of the flat portion 65a. The required portions of the screw portion of the screw S2 passing through the screw holes 65f and 65g are respectively screwed into the third and fourth screw screw portions 52c and 52d provided in the boss portions 52a and 52b. Complete with that. Then, the vibration isolation member 65 is configured to be fixed to the housing 50 so as to support the support body 62.

  According to such an embodiment, the power transmission means 64 has a base 71 (a first receiving portion 77 that receives a required portion of the upper R surface outer peripheral portion of the lead screw portion 61c (that is, a required portion of the outer peripheral portion). A receiving member 67 having a main body portion 66) and a second receiving portion 67b for receiving a required portion of the outer peripheral portion of the lower R surface (that is, another portion of the outer peripheral portion different from the required portion of the outer peripheral portion). The first receiving portion 77 and the second receiving portion 67b are provided with a connecting member 68 having elasticity to connect and fix the main body portion 66 and the receiving member 67 so that the lead screw portion 61c is sandwiched between the first receiving portion 77 and the second receiving portion 67b. First and second threaded portions 78 and 67c, which are threaded portions that are threadedly engaged with the lead screw portion 61c, are formed on the two receiving portions 77 and 67b, respectively.

  Accordingly, when the main body portion 66 and the receiving member 67 are connected and fixed using the elastic connecting member 68, the lead screw portion 61c is provided in the main body portion 66 (base portion 71) in accordance with the action of the upward elastic force. When the main body portion 66 and the receiving member 67 move along the axial direction X by being sandwiched between the first screwing portion 78 and the second screwing portion 67c provided in the receiving member 67, Since there is no rattling between the lead screw portion 61c and the main body portion 66 and between the lead screw portion 61c and the receiving member 67, the angular position of the mirror holder 42 that operates by receiving the power from the power transmission device 43 is determined. The position can be adjusted with high accuracy.

  In other words, by adopting a configuration in which the lead screw portion 61c is sandwiched between the screwed portions 78 and 67c by the upward elastic force as described above, the lead screw portion meshes with the nut as in the conventional case. And the play between the members that occurs when both side surfaces of the nut are sandwiched between a pair of contact surfaces provided on the power transmission member (power transmission means) (that is, the thread of the lead screw portion and the nut Since the occurrence of the play of the meshing part between the screw threaded part and the play of the connecting part between the both side surfaces of the nut and the pair of contact surfaces is suppressed, the angular position of the mirror holder 42 (concave mirror 41) Can be adjusted with high accuracy.

  Moreover, in this embodiment, the 1st threading part 78 threadedly engaged with the 1st receiving part 77 in the base 71 (main-body part 66) at the predetermined location of the said outer peripheral part (the required part of the said upper-side R surface outer peripheral part). A description will be given of an example in which the second receiving portion 67b of the receiving member 67 is provided with a second screwing portion 67c that is screwed into another portion of the outer peripheral portion (a required portion of the outer peripheral portion of the lower R surface). However, for example, the first receiving portion 77 is provided with the first screwing portion 78 and the second receiving portion 67b is not provided with the second screwing portion 67c. The second screwing part 67c may be provided in the part 67b and the first screwing part 78 may not be provided in the first receiving part 77.

  Further, in the present embodiment, the first screwing portion 78 formed on the bottom surface of the mounting portion 72 in the base portion 71 is continuously formed linearly along the axial direction X so as to correspond to the first receiving portion 77. Although the example which is made was demonstrated, in the 1st receiving part 77, it is good also as a structure which provides the 1st screwing part 78 partially. For example, in FIG. 5 described above, the first screwing portion 78 is formed at the first receiving portion 77 that faces the second screwing portion 67c (second receiving portion 67b) across the lead screw portion 61c. Alternatively, the first screwing portion 78 may be provided only at the first receiving portion 77 that does not face the second screwing portion 67c.

  In the present embodiment, an example in which the main body 66 and the receiving member 67 are connected and fixed using the connecting member 68 having elasticity has been described. For example, as shown in FIG. 67, and the shape of the connecting member 68 is improved (devised), and another place of the outer peripheral portion (required portion of the lower R surface outer peripheral portion) is placed on the mounting portion 72 at a predetermined position of the connecting member 68. In other words, the lead screw 61c may be sandwiched between the main body 66 and the predetermined portion of the connecting member 68.

  In this case, the fitting hole 68e in the receiving member 67 and the connecting member 68 employed in the above-described embodiment is abolished, the tip portion of the second guide portion 68b in the connecting member 68 is bent, and the upward elastic force is applied. The required portion of the outer peripheral portion of the lower R surface is pressed against the mounting portion 72 side at the tip portion. Hereinafter, in this modification, the tip portion of the second guide portion 68b of the connecting member 68 is defined as a receiving portion V (corresponding to a predetermined portion of the connecting member 68 described above).

  Therefore, the connecting member 68 having elasticity in this modification has a receiving portion V that receives a required portion of the lower R surface outer peripheral portion, and a receiving portion V and a required portion of the outer peripheral portion (the upper R surface outer peripheral portion). The lead screw part 61 is connected and fixed to the main body part 66 so as to sandwich the lead screw part 61 with a screwing part (first screwing part) 78 provided on the main body part 66 (base part 71). It has a configuration. Even in such a configuration, rattling does not occur between the lead screw portion 61c and the main body portion 66, and between the lead screw portion 61c and the connecting member 68 (receiving portion V). An effect can be obtained.

  In the present embodiment (including the modification), the mounting portion 72 (main body portion 66) is formed with an insertion portion 75 for inserting the guide shaft 63 that is substantially parallel to the lead screw portion 61c. When viewed from the axial direction X side, the guide shaft 63 is disposed above the lead screw portion 61c.

  With this configuration, for example, when the main body portion 66 guided by the guide shaft 63 moves in the axial direction X, the main body portion 66 uses the center point P of the guide shaft 63 as a rotation center in FIG. 7 (FIG. 8). The first screwing portion (screwing portion) 78 rotates in the counterclockwise direction, and the first screw portion (screwing portion) 78 is brought into contact with the lead screw portion 61c when the lower end portion of the first stopper portion 73c and the surface of the flat plate portion 62a of the support 62 are brought into contact with each other. Since the pressing force for pressing (the required portion of the outer peripheral portion of the upper R surface) is reduced to some extent, there is an advantage that the load (stress) applied to the lead screw portion 61c can be reduced.

  Further, in the present embodiment, a metal support 62 that fixes and supports the stepping motor 61 a and a vibration isolation member 65 that is fixed to the housing 50 that is an outer case of the display device 12 so as to support the support 62. The vibration isolating member 65 has a vibration attenuating function for attenuating vibration generated when the stepping motor 61a is driven when reaching the housing 50 from the support body 62.

  Therefore, vibration generated when the stepping motor 61a is driven is transmitted to the support body 62 that is in contact with the stepping motor 61a without being attenuated, and then the vibration of the support body 62 is screwed to the support body 62. Even when the vibration is transmitted to the vibration isolation member 65, the vibration transmitted to the vibration isolation member 65 is eventually transmitted to the vibration isolation member 65 because the vibration isolation member 65 itself has a vibration damping function. The vibration from the support body 62 (the flat plate portion 62a) is greatly damped by the vibration isolation member 65.

  Then, vibrations greatly attenuated via the vibration isolating member 65 are transmitted to the boss portions 52a and 52b (that is, the housing 50) on which the vibration isolating member 65 is placed. Even when 43 is attached and fixed to the outer case (in this case, the housing 50 of the display device 12), the generation of abnormal noise from the housing 50 when the stepping motor 61a is driven can be suppressed as much as possible.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. 9. The same reference numerals are used for the same or corresponding parts as in the first embodiment, and the detailed description thereof will be made. Omitted. In the second embodiment, the configuration of the first embodiment is used as a basic configuration, and the first and second screw threaded portions 62g and 62h, the first and second screws employed in the first embodiment. The holes 65d and 65e and the screw S1 are eliminated, and a metal frame body 90 having no vibration damping function is employed instead of the vibration isolating member 65 having a vibration damping function. The metal frame body 90 and the stepping motor The vibration isolating member 100 is sandwiched between a metal support 62 that fixes and supports the 61a in a stationary state.

  The metal frame 90 has an outer shape that is substantially the same as the outer shape of the vibration isolation member 65 employed in the first embodiment, and is substantially parallel to the flat plate portion 62 a of the support 62. The flat part 91 of the substantially rectangular flat plate shape provided in this way is provided.

  Of the four corners of the flat portion 91, the first ear portion 92 is substantially equal to the plate thickness of the flat portion 91 at the first corner C1 provided at a position corresponding to the first boss portion 52a. The flat portion 91 is formed so as to protrude laterally so as to have the same thickness. Further, the second corner portion C2 is provided in a diagonal direction with respect to the first corner portion C1 and at a position corresponding to the second boss portion 52b. The flat portion 91 is formed so as to protrude from the side so as to have substantially the same thickness.

  The first ear portion 92 is provided with a third screw hole 94 having the same function as the third screw hole 65f employed in the first embodiment, and the second ear portion 93 has the above-mentioned first screw hole 94. A fourth screw hole 95 having the same function as that of the fourth screw hole 65g employed in the embodiment is provided.

  The frame body 90 and the housing 50 (the boss portions 52a and 52b) are not shown in detail, but the screw portion of the screw S2 is fixed from the surface side of the flat portion 91 as in the first embodiment. Third and fourth screw holes 94 and 95 are inserted into the respective screw holes 94 and 95, and the required portions of the screw portions of the screw S2 passing through the screw holes 94 and 95 are provided in the boss portions 52a and 52b. This is completed by being screwed into the screw threaded portions 52c and 52d. Then, the frame body 90 is configured to be fixed to the housing 50 that is an outer case of the display device 12 so as to support the support body 62.

  The vibration isolation member 100 is made of an elastic material such as silicon rubber, is formed in a substantially rectangular shape, and is interposed between the metal support body 62 and the metal frame body 90. The vibration isolating member 100 has a vibration damping function that attenuates vibration generated when the stepping motor 61a is driven when the stepping motor 61a reaches the frame body 90 (housing 50). In this case, the vibration isolating member 100 and the support body 62, and the vibration isolating member 100 and the frame body 90 are both bonded and fixed using a double-sided tape.

  According to the second embodiment, vibration generated when the stepping motor 61a is driven is transmitted to the support body 62 that is in contact with the stepping motor 61a without being attenuated. Thereafter, the vibration of the support body 62 is bonded to the support body 62. Even when the vibration is transmitted to the fixed vibration isolation member 100, the vibration transmitted to the vibration isolation member 100 is consequently prevented because the vibration isolation member 100 itself has a vibration damping function. The vibration from the support body 62 transmitted to the vibration member 100 is greatly attenuated by the vibration isolation member 100. Since the vibration greatly attenuated through the vibration isolating member 100 is transmitted to the frame body 90 (housing 50) on which the vibration isolating member 100 is placed, this causes the stepping motor 61a to be driven. It is possible to suppress the generation of abnormal noise from the housing 50 as much as possible.

  In each of the above embodiments, the power transmission device 43 is used to transmit power to the hanging portion 42e and the angular position of the mirror holder 42 (concave mirror 41) is adjusted. The power transmission device 43 may be adopted.

  Specifically, although not shown in detail, the liquid crystal display 20 has a window portion through which illumination light emitted from the light source 21 passes, and a movable support in which the liquid crystal display element 22 is placed (supported). A predetermined part of the body (for example, a standing wall-shaped flange extending outward of the movable support) is positioned between the first and second protrusions 83 and 84 of the main body 66 described above, and the power transmission means 64 Moves along the axial direction X to transmit power to the predetermined portion (the collar portion) which is a driven portion, and the movable support (liquid crystal display element 22) is rotated clockwise with a predetermined position as a reference position. The arrangement may be such that the position of the liquid crystal display element 22 is adjusted by turning it counterclockwise. With this configuration, it is possible to adjust the inclination of the display image V with respect to the windshield 13 (in other words, the inclination of the display image V visible to the user 14 with respect to the virtual horizontal line).

40 Second reflector 41 Concave mirror (reflective member)
42 Mirror holder (holding member)
42e hanging part (power transmission part)
43 Power transmission device 50 Housing (exterior case)
61 Driving means 61a Stepping motor (driving member)
61c Lead screw portion 62 Support body 63 Guide shaft 64 Power transmission means 65, 100 Anti-vibration member 66 Main body portion 67 Receiving member 67b Second receiving portion 67c Second screwing portion (screwing portion)
68 connecting member 71 base portion 72 mounting portion 73 first leg portion 74 second leg portion 77 first receiving portion 78 first screwing portion (screwing portion)
83 First Projection 84 84 Second Projection 90 Frame Body RA Axis of Rotation X Axial Direction V Receiving Unit

Claims (5)

A lead screw portion that is rotationally driven as the drive member is driven;
In a power transmission device including power transmission means that moves along the axial direction of the lead screw portion by rotation of the lead screw portion and transmits power to a power transmission portion.
The power transmission means includes a main body portion having a threaded portion that is threadedly engaged with a required portion of an outer peripheral portion of the lead screw portion,
A receiving portion for receiving another portion of the outer peripheral portion different from the required portion of the outer peripheral portion is connected and fixed to the main body portion so as to sandwich the lead screw portion between the screwing portion and the receiving portion. A power transmission device comprising a connecting member having elasticity. A lead screw portion that is rotationally driven as the drive member is driven;
In a power transmission device including power transmission means that moves along the axial direction of the lead screw portion by rotation of the lead screw portion and transmits power to a power transmission portion.
The power transmission means includes a main body portion having a first receiving portion for receiving a required portion of the outer peripheral portion of the lead screw portion,
A receiving member having a second receiving part for receiving another part of the outer peripheral part different from the required part of the outer peripheral part;
An elastic connecting member for connecting and fixing the main body and the receiving member so as to sandwich the lead screw portion between the first receiving portion and the second receiving portion;
A power transmission device, wherein a screwing portion that is screwed into the lead screw portion is formed in at least one of the first receiving portion and the second receiving portion. The body portion is formed with an insertion portion for inserting a guide shaft that is substantially parallel to the lead screw portion,
3. The power transmission device according to claim 1, wherein the guide shaft is disposed above the lead screw portion when viewed from the axial direction side. 4. The metal support body which fixes and supports the said drive member, and the vibration isolator member fixed to a predetermined | prescribed exterior case so that the said support body may be supported is provided. The power transmission device described. A metal support that fixes and supports the drive member, a metal frame that is fixed to a predetermined exterior case so as to support the support, and a support that is interposed between the support and the frame. The power transmission device according to claim 1, further comprising a vibration isolation member.

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