JPWO2020090463A1 - Power transmission device - Google Patents

Abstract

Provided is a power transmission device that does not cause image blurring of a display image. The power transmission member (65) has a pair of wall portions (65c, 65d) facing each other with the second extension portion (42e) interposed therebetween, and one wall portion (65c, 65d) of the pair of wall portions (65c, 65d). The 65c) is provided with a protrusion (65h) protruding toward the second extension (42e) side, and a leaf spring (65d) is provided on the other wall (65d) of the pair of wall portions (65c, 65d). 65i) is provided, and the first contact portion (T1) where the protrusion (65h) and the second extension portion (42e) come into contact with each other, and the leaf spring (65i) and the second extension portion (42e) are formed. Both of the abutting second contact portion (T2) are not located on the virtual line (70) extending parallel to the axial direction X.

Description

The present invention relates to a power transmission device used in, for example, a head-up display device.

Conventionally, in this type of power transmission device, for example, as described in Patent Document 1 below, a stepping motor (driving member) is used to adjust the angular position of a concave mirror provided in a head-up display device for a vehicle. It is known that the concave mirror is driven to adjust the angle position of the concave mirror.

Here, the above-mentioned head-up display device is mainly composed of a reflector that reflects the display light emitted from the display, and a housing that houses the display and the reflector, and is reflected by a concave mirror provided in the reflector. The display light is irradiated to the windshield of the vehicle, and the display image obtained by this irradiation is visually recognized by the user of the vehicle.

Then, in this case, the reflector is directed toward the outside of the concave mirror (reflecting member) that reflects the display light from the display, the resin mirror holder (holding member) that holds the concave mirror, and the mirror holder. A power transmission device that can adjust the angular position of the mirror holder by rotating the mirror holder around a predetermined rotation axis by transmitting power to a protruding piece that is a partially protruding powered transmission unit. To be equipped.

The power transmission device includes a stepping motor and a rotating shaft extending from the stepping motor, and also has a driving means in which a lead screw portion which is a screw groove is formed on the peripheral surface of the rotating shaft, and a function of mainly fixing and supporting the stepping motor. A metal support to be held, a metal nut fixed so as to mesh with the lead screw portion, a guide shaft fitted to the support so as to be parallel to the lead screw portion, and a base portion (base portion). A pair of contact surfaces that come into contact with both side surfaces of the nut are formed on the nut, and a pair of hemispherical protrusions that make point contact with the protruding piece of the mirror holder on the pair of facing wall portions that project forward of the base portion. Is composed of each of the formed power transmission members.

In the power transmission device configured in this way, when the lead screw portion is rotationally driven by the drive of the stepping motor, the nut screwed into the lead screw portion due to the rotation of the lead screw portion is axially driven by the lead screw portion. In synchronization with the reciprocating movement of the nut, for example, one side surface of the two side surfaces of the nut is in contact with one side surface of the pair of contact surfaces, which is in contact with the one side surface. Thrust acts on the surface.

Then, by the action of this thrust, the power transmission member moves along the axial direction (reciprocating movement) in synchronization with the reciprocating movement of the nut while being guided by the guide shaft. Then, as the power transmission member moves, the protruding piece in point contact with the pair of protrusions provided on the power transmission member receives power to rotate the mirror holder around the rotation axis. Be transmitted.

That is, this means that the mirror holder and the concave mirror held by the mirror holder rotate by a predetermined angle about the rotation axis by power transmission to the protruding piece. Then, by moving the concave mirror at an angle in this way, the projection direction of the display light with respect to the windshield is adjusted, and accordingly, the position of the display image visible to the user of the vehicle is moved in the vertical direction of the windshield. It becomes possible.

Japanese Unexamined Patent Publication No. 2009-73461

By the way, in the case of the power transmission device used in the head-up display device described in Patent Document 1, the structure is such that a protruding piece of the mirror holder is sandwiched between a pair of protrusions provided on the power transmission member. Since there is a dimensional tolerance in the dimensions of each part of the power transmission member and the mirror holder, in some cases, due to the dimensional tolerance, a protrusion provided on the power transmission member (for example, one of a pair of protrusions). It is conceivable that a minute clearance is generated between the protruding portion of the mirror holder and the protruding piece provided on the mirror holder.

Then, it is conceivable that the mirror holder (that is, the concave mirror held by the mirror holder) tilts due to this minute clearance so that the mirror holder (that is, the concave mirror held by the mirror holder) tilts, resulting in blurring of the display image visually recognized by the vehicle user through the front glass. May occur.
Therefore, an object of the present invention is to provide a power transmission device that does not cause image blurring of a display image in order to deal with the above-mentioned problems.

The present invention includes a lead screw portion that is rotationally driven by driving a drive member, and a power transmission member that moves along the axial direction of the lead screw portion due to the rotation of the lead screw portion and transmits power to the powered transmission portion. In the power transmission device provided with the above, the power transmission member has a pair of wall portions facing each other with the powered transmission portion interposed therebetween, and the power transmission is performed on one of the wall portions of the pair of wall portions. A first contact portion where a protrusion is provided so as to project toward the portion side, an elastic member is provided on the other wall portion of the pair of wall portions, and the protrusion and the powered transmission portion come into contact with each other. And both of the second contact portion where the elastic member and the powered transmission portion come into contact with each other are not located on a virtual line extending in parallel with the axial direction.

According to the present invention, it is possible to provide a power transmission device that can achieve a desired object and does not cause image blurring of a display image.

It is the schematic of the head-up display device by embodiment of this invention. It is sectional drawing of the head-up display device by the same embodiment. It is a perspective view which shows the 2nd reflector by the same embodiment. It is sectional drawing which shows the 2nd reflector and the required part of a housing by the same embodiment (hatching is omitted). It is a perspective view which shows each part of the position adjusting means and a part of a holding member by the same embodiment. It is sectional drawing which shows the positional relationship of the drive means, the moving member, and the power transmission member in the position adjusting means by the same embodiment. It is an enlarged cross-sectional view of a main part which shows a part of a power transmission member and a part of a holding member by the same embodiment (hatching is omitted). It is an enlarged cross-sectional view of a main part which shows a part of a power transmission member and a part of a holding member by the modification of the same embodiment (hatching is omitted).

Hereinafter, 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 with reference to FIGS. 1 to 7.

As shown in FIG. 1, the head-up display device projects the display light L projected by the display device 12 which is a display unit arranged inside the instrument panel 11 of the vehicle 10 on the windshield 13 of the vehicle 10 which is a projection member. The virtual image V is displayed by reflecting the light in the direction of the driver (user) 14. In other words, the head-up display device emits (projects) the display light L emitted from the liquid crystal display described later of the display device 12 onto the windshield 13 (the projection member), and the display image (projection) obtained by this emission (projection). The virtual image) V is visually recognized by the user 14. As a result, the user 14 can observe the virtual image V by superimposing it on the landscape.

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

The liquid crystal display 20 is located on the front side (directly above) of the light source 21 composed of a light emitting diode mounted on the wiring board R and the light source 21 so as to transmit the illumination light from the light source 21 to form the display light L. It is mainly composed of a positioned TFT type liquid crystal display element (display element) 22. This means that the light source 21 is arranged behind (directly below) the liquid crystal display element 22, and the liquid crystal display element 22 displays predetermined information (information to be displayed later) by the light emitted from the light source 21. Means.

In this case, the liquid crystal display 20 is provided in the housing 50 so that the surface on the emission side of the display light L faces the cold mirror described later of the first reflector 30, and the optical axis of the display light L is the cold. It is fixed and held at a position and orientation that intersects the mirror.

Further, the liquid crystal display element 22 emits and displays information (for example, vehicle speed and engine speed) to be displayed by an element drive circuit (not shown) as a numerical value or the like. The liquid crystal display 20 outputs display light L composed of light in the visible wavelength range, and 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 has a cold mirror 31 and a mounting member 32 for mounting and fixing the cold mirror 31 using a predetermined mounting 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 of the second reflector 40 facing the concave mirror described later). The first reflective layer 31b is made of a multi-layer interference film having a different film thickness, and is formed by a method such as thin film deposition. Further, the cold mirror 31 is arranged in an inclined state at a position where the display light L emitted by the liquid crystal display 20 is reflected toward the second reflector 40 (the concave mirror).

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 other than the visible wavelength range. It reflects at the reflectance. In this case, as the cold mirror 31, a cold mirror 31 that reflects light in a wavelength region other than the visible wavelength region (heat rays of infrared rays or sunlight) with a low reflectance (for example, 15% or less) is applied. The light that is not reflected by the first reflecting layer 31b is configured to pass through the cold mirror 31.

Further, in the case of the present embodiment, the cold mirror 31 and the liquid crystal display 20 are arranged at a position not directly facing the translucent cover described later of the housing 50, and the light from the outside such as sunlight (external light). Has a structure that does not directly hit. The mounting member 32 is made of, for example, a black synthetic resin material, and is appropriately fixed to the housing 50 by using fixing means.

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 display element 22), and a mirror holder that holds the concave mirror 41. The holding member 42 and the position adjusting means 43 for adjusting the angular position (arrangement position) of the holding member 42 are provided.

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

Further, the concave mirror 41 magnifies the display light L from the cold mirror 31 and reflects (projects) it toward the translucent cover (windshield 13 of the vehicle 10). This means that the concave mirror 41 magnifies the display light L reflected by the cold mirror 31 and projects the magnified display light L onto the windshield 13 through the translucent cover.

The holding member 42 includes a substantially columnar shaft portion 42a formed of a metal material (or synthetic resin material) and pivotally supported by a bearing portion (not shown) provided in the housing 50. Further, the holding member 42 includes a holding portion 42b which is a wall portion for holding (supporting) the concave mirror 41. In this case, 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 holding member 42 and the concave mirror 41 held by the holding member 42 have a configuration in which the angle can be moved (rotatably) about the rotation axis (predetermined rotation axis) RA which is the central axis of the shaft portion 42a. There is.

Reference numeral 42c is a protruding piece (protruding portion) formed in a substantially L-shape below the concave mirror 41 from behind the concave mirror 41 toward the second reflective layer 41a, and the protruding piece 42c is It has a first extension portion 42d and a second extension portion 42e as a powered transmission portion, and is integrally formed with the holding member 42.

In FIG. 4, the first extension portion 42d extends from the bottom surface portion 42f forming the bottom wall of the holding portion 42b of the holding member 42 toward the second reflective layer 41a (in other words, a lead described later). It is a thin plate-shaped wall portion (extending along the substantially axial direction of the screw portion).

Further, the second extension portion 42e, which is a powered transmission portion, is continuous with the first extension portion 42d so as to hang downward (the lead screw portion side) from the tip portion of the first extension portion 42d. It is a thin plate-shaped standing wall portion formed. The second extension portion 42e has the protrusion and the leaf spring so that both side surfaces 42g and 42h (see FIG. 4) come into point contact with the protrusion and the leaf spring provided in the position adjusting means described later. It is sandwiched by. In the following description, of the side surfaces 42g and 42h, the side surface 42g is referred to as one side surface, and the side surface 42h is also referred to as the other side surface.

As shown in FIGS. 3 to 5, the position adjusting means 43 is mainly composed of a driving means 61, a support 62, a nut 63, a guide shaft 64, a power transmission member 65, and a vibration isolator member 66. , The holding member 42 is rotated about the rotation axis RA to adjust the angular position of the holding member 42 (concave mirror 41) (in other words, the projection direction of the display light L is adjusted).

The drive means 61 includes a stepping motor (driving member) 61a that generates a rotational driving force by energization, and a rotary shaft 61b that extends from the stepping motor 61a. The rotating shaft 61b includes a lead screw portion 61c which is a screw groove formed spirally on the peripheral surface thereof. The lead screw portion 61c (rotary shaft 61b) is rotationally driven by receiving the rotational driving force from the stepping motor 61a.

The support 62 is a metal motor case that fixes and supports the stepping motor 61a in an immovable state, is formed in a substantially U-shaped cross section, and is a substantially plate arranged along the axial direction X of the lead screw portion 61c. It has a flat plate portion 62a and a pair of first and second flange portions 62b and 62c in which both end portions of the flat plate portion 62a are bent at substantially right angles.

The first flange portion 62b located on the stepping motor 61a side is fitted with a through hole 62d through which the end portion (end portion) 61d of the lead screw portion 61c penetrates and one end of the guide shaft 64. The fitting hole 62e of 1 is formed. The first flange portion 62b and the required portion of the stepping motor 61a are appropriately fixed to each other by fixing means, whereby the stepping motor 61a is fixedly supported by the support 62 in an immovable state.

On the other hand, on the side of the second flange portion 62c paired with the first flange portion 62b, a hole corresponding to the through hole 62d (not shown) and a hole corresponding to the first fitting hole 62e correspond to the guide shaft 64. A second fitting hole 62f into which the other end is fitted is formed. The bearing member G is mounted in the hole provided in the second flange portion 62c. Then, the tip portion 61e portion of the lead screw portion 61c located on the tip end side of the protruding portion that penetrates the through hole 62d and protrudes toward the bearing member G side is rotatably supported through the bearing member G.

The 62g and 62h are provided at positions corresponding to the first and second screw holes described later of the vibration isolator 66, and the screw portions of the screws S1 penetrating the first and second screw holes are screwed together. It is a first and second screwed portion for making the screw. The first and second screwed portions 62g and 62h are formed so as to project substantially cylindrically on the surface side of the flat plate portion 62a on both end sides of the flat plate portion 62a, and specifically, the first screwed portion is formed. 62 g is provided in the vicinity of the first flange portion 62b, and the second screwed portion 62h is provided in the vicinity of the second flange portion 62c.

The nut 63 is screwed (meshed) into a predetermined position of the lead screw portion 61c on the rotating shaft 61b, and the thrust applied by the rotation of the lead screw portion 61c causes the lead screw portion 61c to move on the lead screw portion 61c in the axial direction X. Move along. In this case, the nut 63 is moved (reciprocated) to the tip portion 61e or the end portion 61d of the lead screw portion 61c by rotationally driving the lead screw portion 61c.

The guide shaft 64 is made of, for example, an elongated cylindrical metal material, and one end thereof is a first fitting hole 62e of the support 62 so as to be substantially parallel to the lead screw portion 61c (rotary shaft 61b). And the other end is fitted into the second fitting hole 62f of the support 62.

The power transmission member 65 is formed of a synthetic resin material such as polyacetal, and has a base portion 65a and a pair of wall portions 65c formed so as to project upward from the surface portion 65b of the base portion 65a so as to face each other. It has 65d. Further, in this case, the power transmission member 65 has a function of moving along the axial direction X of the lead screw portion 61c by the rotation of the lead screw portion 61c and transmitting the power to the second extension portion 42e.

In the following description, of the pair of wall portions 65c and 65d facing each other with the second extension portion 42e in between, the facing wall located on the end portion 61d side of the lead screw portion 61c is designated as one wall portion 65c, and the pair. Of the wall portions 65c and 65d, the facing wall located on the tip end portion 61e side of the lead screw portion 61c is referred to as the other wall portion 65d.

The base portion 65a is in contact with the insertion portion 65e having a substantially circular through-hole shape for inserting the guide shaft 64 and the required portions of the first and second side surfaces 63a and 63b on both side surfaces of the nut 63 ( A pair of first and second contact portions 65f and 65g that make surface contact) are formed (see FIG. 6). In this case, the first and second contact portions 65f and 65g are integrally formed with the base portion 65a so as to partially sandwich the first and second side surfaces 63a and 63b of the nut 63.

In the nut 63, the surface on the first flange portion 62b side is referred to as the first side surface 63a, and the surface on the second flange portion 62c side is referred to as the second side surface 63b. Further, the first contact portion 65f and the first side surface 63a are in contact with each other, and the second contact portion 65g and the second side surface 63b are in contact with each other, and the first and second contact portions 65f and 65g are brought into contact with each other. It is assumed that the nut 63 is sandwiched.

One wall portion 65c is provided with a substantially hemispherical protrusion 65h projecting toward one side surface 42g side (second extension portion 42e side), and the other wall portion 65d is provided with the other side surface 42h. A metal leaf spring 65i as an elastic member for applying a pressing force, which will be described later, is provided on the (second extension portion 42e) (see FIG. 7).

Although the details will be described later, when the second extension portion 42e is inserted between the protrusion 65h and the leaf spring 65i, the second extension 42e and the protrusion 65h are the apex portions of the protrusion 65h. The first contact portion T1 is always in point contact. As the shape of the protrusion 65h, any shape can be adopted as long as it can make point contact with one side surface 42g.

The leaf spring 65i is attached to, for example, the surface of the other wall portion 65d on the other side surface 42h side, and is fixed so as to be in close contact with the other wall portion 65d by using an appropriate fixing means, and the fixing portion F1 and the fixing portion. An inclined portion F2 extending diagonally from the upper end side of the F1 toward the other side surface 42h side, and a bent tip portion F3 slightly bent from the lower end side of the inclined portion F2 toward the fixed portion F1 side. Has.

Here, in a situation where the leaf spring 65i is attached to the other wall portion 65d, when the second extension portion 42e is inserted between the leaf spring 65i and the protrusion 65h, the leaf spring 65i becomes the inclined portion F2. In a state where the bent tip portion F3 is slightly elastically deformed toward the other wall portion 65d, the second extension portion 42e and the second extension portion 42e at the second contact portion T2 which is the boundary portion between the inclined portion F2 and the bent tip portion F3. Contact.

Then, since a pressing force (elastic recovery force) acts on the leaf spring 65i toward one wall portion 65c side, the second extension portion 42e is constantly urged toward the protrusion portion 65h side, and the second extension portion 42e is always urged. The extension portion 42e (one side surface 42g) and the protrusion 65h are not always separated from each other. Along with this, the second extension portion 42e and the protrusion 65h are in point contact at the first contact portion T1, and as a result, the second extension portion 42e is always between the protrusion 65h and the leaf spring 65i. , Will be pinched.

At this time, the first contact portion T1 in which the second extension portion 42e (one side surface 42g) and the protrusion 65h come into contact with each other, the second extension portion 42e (the other side surface 42h), and the leaf spring 65i are in contact with each other. Focusing on the positional relationship with the second contact portion T2 in contact, in the case of this example, both the first contact portion T1 and the second contact portion T2 are virtual extending in parallel with the axial direction X of the lead screw portion 61c. A configuration that is not located on the line (virtual horizontal line) 70 is adopted.

For example, in FIG. 7, when the first contact portion T1 is located on the virtual line 70, the second contact portion T2 does not exist on the virtual line 70 and is located below the virtual line 70. There is. That is, this means that the first contact portion T1 and the second contact portion T2 have the same height in the height direction of the pair of wall portions 65c and 65d (the direction orthogonal to the axial direction X). It means that it is not located at the position and the second contact portion T2 is located below the first contact portion T1.

The anti-vibration member 66 is formed of a soft synthetic resin material (for example, polypropylene resin) having a vibration damping function, and includes a substantially rectangular flat plate-shaped base portion 66a provided so as to correspond to the flat plate portion 62a of the support 62. .. The anti-vibration member 66 has a vibration damping function that attenuates vibration generated when the stepping motor 61a is driven from the support 62 to the housing 50.

The first ear portion 66b is formed in the first corner portion C1 provided at a position corresponding to the first boss portion described later of the housing 50 among the four corner portions of the base portion 66a of the vibration isolator member 66. , The plate thickness is formed so as to have substantially the same plate thickness as the plate thickness of the base portion 66a so as to project laterally from the base portion 66a. Further, in the second corner portion C2 provided at a position diagonal to the first corner portion C1 and corresponding to the second boss portion described later in the housing 50, a second ear portion 66c is provided as a base portion. It is formed so as to project laterally from the base 66a so as to have a plate thickness substantially the same as the plate thickness of 66a.

The 66d and 66e are provided so as to communicate with the first and second screwed portions 62g and 62h of the support 62, respectively, and are through holes for allowing the screw portion of the screw S1 to penetrate from the back side of the base portion 66a. The first and second screw holes are made of, and the first and second screw holes 66d and 66e are located near the center of the base portion 66a, and the first screw hole 66d is the first flange portion. It is provided on the 62b side, and the second screw hole 66e is provided on the second flange portion 62c side.

Then, for fixing the anti-vibration member 66 and the support 62, as shown in FIG. 4, the screw portion of the screw S1 is passed through the first and second screw holes 66d and 66e from the back side of the base portion 66a, respectively. It is completed by screwing the required portion of the screw portion of the screw S1 penetrating the screw holes 66d and 66e into the first and second screwed portions 62g and 62h, respectively. As a result, the support 62 and the vibration isolator 66 are fixed by the screw S1 which is the first fixing means.

The 66f is provided so as to communicate with a third screw screw portion to be described later, which is provided in the first boss portion, and is provided through a through hole for penetrating the screw portion of the screw S2 from the surface side of the base portion 66a. The third screw hole 66f is formed at a predetermined position of the first ear portion 66b.

Similarly, 66g is provided so as to communicate with a fourth screw screw portion to be described later provided in the second boss portion, and a through hole for penetrating the screw portion of the screw S2 from the surface side of the base portion 66a. It is a fourth screw hole made of, and the fourth screw hole 66g is formed at a predetermined position of the second ear portion 66c.

In the position adjusting means 43 configured in this way, when the lead screw portion 61c is rotationally driven by receiving the rotational driving force from the stepping motor 61a, the nut 63 meshed with the lead screw portion 61c moves in the axial direction X. Move back and forth along. Then, for example, when the nut 63 is moved to the side of the first flange portion 62b, the first side surface 63a of the nut 63 has a first contact portion 65f in surface contact with the first flange portion 65f. A thrust that moves the portion 62b side acts.

By the action of this thrust, the power transmission member 65 is translated to the first flange portion 62b side along the axial direction X in synchronization with the movement of the nut 63 while being guided by the guide shaft 64. Then, with the translation of the power transmission member 65, a power for rotating the holding member 42 is transmitted to the second extension portion 42e interposed between the protrusion 65h and the leaf spring 65i. .. That is, this means that the holding member 42 rotates in the direction of the arrow in FIG. 4 about the rotation axis RA by the power transmission to the second extension portion 42e.

When the nut 63 moves to the second flange portion 62c side instead of the first flange portion 62b side, the power transmission member 65 moves in parallel to the second flange portion 62c side, whereby the second flange portion 62c side is moved. Needless to say, a force for rotating the holding member 42 about the rotation axis RA in the direction opposite to the direction of the arrow in FIG. 4 acts on the extension portion 42e of the above.

The housing 50 is formed of, for example, an aluminum die-cast, and includes an upper case 51 and a lower case 52 both having a substantially concave cross section, and is a space portion which is an internal space formed by the upper case 51 and the lower case 52. In 53, the liquid crystal display 20 (liquid crystal display element 22), the first reflector 30, and the second reflector 40 composed of the concave mirror 41, the holding member 42, and the position adjusting means 43 are housed (FIG. 5). 2).

The upper case body 51 is formed with an opening window portion 51a through which the upper portion (the windshield 13 side of the vehicle 10) of the arrangement position of the concave mirror 41 opens, and the opening window portion 51a is provided with the opening window portion 51a. A translucent cover 54, which is a translucent portion, is arranged so as to close the film.

The translucent cover 54 is formed of a translucent synthetic resin material, and has a function as a light transmissive member through which the display light L reflected by the concave mirror 41 is transmitted (passed). 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 display image (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 protruding from the bottom portion toward the vibration isolator 66 side are formed on the bottom portion of the lower case body 52. Provided.

Of these, the first boss portion 52a includes a third screw screw portion 52c for screwing the screw S2, and the third screw screw portion 52c is a third screw screw portion 52c provided on the vibration isolator member 66. It communicates with the screw hole 66f. 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 a fourth screw provided on the vibration isolator member 66. It communicates with the hole 66g.

Then, in order to fix the housing 50 (each boss portion 52a, 52b) and the vibration isolator member 66, the screw portion of the screw S2 is passed through the third and fourth screw holes 66f, 66g from the surface side of the base portion 66a, respectively. The required portion of the screw portion of the screw S2 that penetrates the screw holes 66f and 66g is screwed into the third and fourth screw screw portions 52c and 52d provided in the boss portions 52a and 52b, respectively. Complete with. As a result, the housing 50 (each boss portion 52a, 52b) and the vibration isolator member 66 are fixed by the screw S2 which is the second fixing means.

As described above, in the present embodiment, one wall portion 65c of the power transmission member 65 is provided with a protrusion 65h projecting toward the second extension portion 42e side, and the other wall portion 65d of the power transmission member 65 is provided. Is provided with a leaf spring 65i, a first contact portion T1 in which the protrusion 65h and the second extension portion 42e abut, and a second contact portion in which the leaf spring 65i and the second extension portion 42e abut. Both of the T2 and the lead screw portion 61c are not located on the virtual line 70 extending in parallel with the axial direction X of the lead screw portion 61c.

Therefore, when the second extension portion 42e is pressed toward one wall portion 65c by the leaf spring 65i (the elastic return force), the second extension portion 42e (protruding piece 42c) and the protrusion 65h are always in contact with each other. It does not come into contact with each other. As a result, the generation of the minute clearance conventionally formed between the protrusion and the protrusion is suppressed, and the fixed reliability of the second extension 42e sandwiched between the protrusion 65h and the leaf spring 65i. It is possible to improve the property, and the holding member 42 does not rattle when the power is transmitted to the holding member 42 by the second extension portion 42e, and the image blurring of the display image V visually recognized by the user 14 occurs through the windshield 13. There is no fear.

The present invention is not limited to the above-described embodiments and drawings. Changes (including deletion of components) can be made to the embodiments and drawings as appropriate without changing the gist of the present invention.

For example, in the above-described embodiment, the second contact portion T2 is located below the first contact portion T1 in the height direction of the pair of wall portions 65c and 65d, but the first The contact portion T1 and the second contact portion T2 need not be provided at the same height position in the height direction. For example, FIG. 8 is a modification of the present embodiment. Needless to say, as shown in the above, the second contact portion T2 may be positioned above the first contact portion T1 in the height direction.

30 1st reflector
40 Second reflector
41 Concave mirror (reflective member)
42 Holding member
42c protruding piece
42d first extension
42e Second extension (powered transmission)
42g One side (one side)
42h The other side (the other side)
43 Position adjustment means
61 Drive means
61a Stepping motor (driving member)
61c lead screw part
62 Support
63 nuts
64 Guide shaft
65 Power transmission unit
65a base
65c One wall
65d The other wall
65h protrusion
65i leaf spring (elastic member)
66 Anti-vibration member
70 Virtual line (virtual horizontal line)
L Display light
RA rotation axis
T1 first contact part
T2 second contact part
X-axis direction

Claims (1)

The lead screw part that is rotationally driven by the drive of the drive member,
In a power transmission device provided with a power transmission member that moves along the axial direction of the lead screw portion by rotation of the lead screw portion and transmits power to the powered transmission portion.
The power transmission member has a pair of wall portions facing each other with the powered transmission portion interposed therebetween.
One of the pair of wall portions is provided with a protrusion that projects toward the powered transmission portion side.
An elastic member is provided on the other wall portion of the pair of wall portions.
Both the first contact portion where the protrusion and the powered transmission portion come into contact with each other and the second contact portion where the elastic member and the powered transmission portion come into contact extend in parallel with the axial direction. A power transmission device characterized by not being located on a virtual line.

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