JP6780524B2 - Head-up display device - Google Patents

Description

The present invention relates to a head-up display (hereinafter referred to as HUD (Head Up Display)) device including a projection unit and a reflector unit.

Conventionally, the light of the display light image projected from the projection unit is reflected by the reflector unit and projected onto the projection member of the vehicle, so that the display light image can be visually displayed by the occupant in the vehicle interior of the vehicle. The device is widely known.

In the device disclosed in Patent Document 1 as a kind of such HUD device, the light of the display light image from the projection unit is reflected toward the projection member side by the surface reflection surface portion provided on the surface of the mirror body included in the reflector unit. There is. Therefore, sunlight incident on the vehicle interior from the outside of the vehicle is reflected by the surface reflecting surface portion of the mirror body and reaches the projection unit, which may cause thermal damage to the projection unit. Therefore, the heat of the projection unit is released by the Peltier element.

Japanese Unexamined Patent Publication No. 2010-76169

However, depending on the driving position of the mirror body by the drive source, the sunlight incident on the vehicle interior is reflected by the surface reflecting surface and reaches the occupant's visible area, which may reduce the visibility of the displayed light image. There is. The disclosure device of Patent Document 1 does not deal with the problem of such a decrease in visibility.

The present invention has been made in view of the problems described above, and an object of the present invention is to provide a HUD device that suppresses thermal damage and deterioration of visibility.

Hereinafter, the technical means of the invention for achieving the subject will be described. The scope of claims for disclosing the technical means of the invention and the reference numerals in parentheses described in this column indicate the correspondence with the specific means described in the embodiment described in detail later. It does not limit the technical scope of the invention.

The first invention disclosed to solve the above-mentioned problems is
The projection unit (20) and the reflector unit (3) are included, and the light of the display light image (5) projected from the projection unit is reflected by the reflector unit to the projection member (4) of the vehicle (2). A head-up display device (1) that displays a virtual image of a display light image that can be visually displayed by an occupant in the passenger compartment (2a) of a vehicle by projecting.
The reflector unit is
A mirror body (32) that forms a front surface (320) and a back surface (321) and allows light to pass between the front surface and the back surface.
It is equipped with a drive source (36) that drives the mirror body.
The surface is
A front reflecting surface portion (320a) that blocks the transmission of light to the back surface side and reflects the light to the projection member side opposite to the back surface side.
It has a transmissive surface portion (320b) provided around the front reflective surface portion and transmitting light to the back surface side.
The back side is
It has a back reflecting surface portion (321a) that reflects light that is assumed to be incident on the transmitting surface portion within the driving range of the mirror body by the driving source to a portion deviated from the transmitting surface portion.

According to the first invention, of the front surface of the mirror body that allows light transmission between the front surface and the back surface, the front surface reflecting surface portion that reflects light toward the projection member side opposite to the back surface is directed to the back surface side. A transmissive surface portion that transmits light is provided. According to this, the area of the surface reflecting surface portion can be limited to a size required for light reflection of the display light image, and the reflection of sunlight by the surface can be reduced as much as possible.

Moreover, according to the first invention, the light transmission to the back surface side is blocked by the front reflection surface portion, and the light expected to be incident on the transmission surface portion within the driving range of the mirror body by the drive source (hereinafter referred to as incident assumed light). ) Is reflected to a place outside the transparent surface portion by the back reflective surface portion on the back surface. According to this, not only the reflection portion of sunlight by the back surface can be narrowed down, but also the emission of sunlight from the reflection portion through the transmitting surface portion can be restricted.

Therefore, in the first invention as described above, it is possible to suppress thermal damage and deterioration of visibility caused by the sunlight reflected by the front surface and the back surface reaching the visual areas of the projection unit and the occupant, respectively.

Further, the back surface according to the disclosed second invention forms a back reflection surface portion by a shape portion different from the front surface.

According to the back reflecting surface portion formed by the surface shape portion different from the front surface on the back surface as in the second invention, sunlight can be reflected in a direction significantly different from the front reflecting surface portion. According to this, it is possible to facilitate the configuration design for restricting the emission of sunlight from the transmissive surface portion and to secure the reliability of the effect of suppressing thermal damage and deterioration of visibility.

It is a schematic block diagram which shows the HUD apparatus of one Embodiment. It is a schematic diagram which shows the virtual image display state of the display light image by the HUD apparatus of one Embodiment. It is a front view which shows the reflector unit in the HUD apparatus of one Embodiment. It is sectional drawing which shows the drive source which has the stepping motor and reduction mechanism of FIG. It is an electric circuit diagram which shows the electric connection state of a stepping motor of FIG. 1 and a control unit. FIG. 3 is a sectional view taken along line VI-VI of FIG. It is sectional drawing which shows the operating state different from FIG. It is sectional drawing which shows the modification of FIG. It is sectional drawing which shows the modification of FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the HUD device 1 according to the embodiment of the present invention is mounted on the vehicle 2 to visually display the display light image 5 in the vehicle interior 2a by the occupant. Specifically, the HUD device 1 includes a housing 10, a projection unit 20, an optical system 30, an adjustment switch 80, and a control unit 90.

The housing 10 is formed in a hollow shape and is installed on the instrument panel 2b in the vehicle interior 2a. The housing 10 is arranged in front of the driver's seat in the passenger compartment 2a, and houses the components 20, 30 and the like of the HUD device 1. The housing 10 has a translucent exit window 14 at a position facing the windshield 4 as a projection member installed in front of the driver's seat in the vehicle 2 at the top and bottom.

The projection unit 20 is mainly composed of a transillumination type liquid crystal panel, an organic EL panel, or the like, and has a screen 22. The screen 22 is transmitted and illuminated by a backlight built in the projection unit 20. The image displayed as a real image on the screen 22 is projected as a display light image 5 by receiving such transmitted illumination and emitting light. The display light image 5 projected from the projection unit 20 represents vehicle-related information related to the vehicle 2. As shown in FIG. 2, the display light image 5 of the present embodiment represents navigation information such as the vehicle traveling direction. However, the display light image 5 may represent vehicle state information such as vehicle speed, fuel remaining amount, cooling water temperature, and vehicle outside condition information such as traffic condition, in addition to navigation information.

As shown in FIG. 1, the optical system 30 is composed of a plurality of optical units including the reflector unit 3. However, in FIG. 1, the components other than the reflector unit 3 in the optical system 30 are not shown. As shown in FIGS. 1 and 3, the reflector unit 3 includes a bearing body 34, a mirror body 32, a drive source 36, and an elastic member 39.

The bearing body 34 is formed in a frame shape. The bearing body 34 has a fixed base 340, a holding base 341, and a bearing base 342. The fixed base 340, which has a strip-shaped flat plate shape, is fixed to the bottom of the housing 10 below the mirror body 32. The holding base 341, which has a substantially rectangular flat plate shape, projects substantially vertically upward from one end of the fixed base 340. The bearing base 342, which has a substantially rectangular flat plate shape, protrudes substantially vertically upward from the other end of the fixed base 340 on the opposite side of the holding base 341.

In the present embodiment, the mirror body 32 is a so-called concave mirror having a surface 320 recessed in a smooth curved surface. As shown in FIG. 1, the display light image 5 directly or indirectly incident on the surface 320 from the projection unit 20 is magnified by the mirror body 32 and reflected toward the exit window 14. The display light image 5 reflected in this way is projected onto the windshield 4 by passing through the exit window 14. As a result, the light of the display light image 5 reflected by the windshield 4 is perceived by the occupant on the driver's seat in the passenger compartment 2a. As a result, the virtual image of the display light image 5 formed in front of the windshield 4 can be visually recognized by the occupant in the visibility area 6 in the vehicle interior 2a.

As shown in FIG. 3, the mirror body 32 is integrally provided with a rotating shaft 328. The rotating shaft 328 has a first shaft portion 328a and a second shaft portion 328b separated on both sides of the surface 320 in the lateral direction. The first shaft portion 328a and the second shaft portion 328b are formed in a columnar shape coaxial with each other, and project to the opposite sides. The first shaft portion 328a is integrally rotatably connected to the output shaft 381 of the drive source 36 held by the holding base 341 of the bearing body 34. The second shaft portion 328b is rotatably supported by the bearing base 342 of the bearing body 34.

Under such a configuration, the first shaft portion 328a is rotationally driven by the drive source 36, so that the surface 320 of the mirror body 32 reflects the display light image 5 in a direction corresponding to the rotation position of the rotation shaft 328. Change. As a result, the virtual image display position of the display light image 5 is adjusted up and down with respect to the windshield 4 as shown in FIG. Here, in the present embodiment, the virtual image display position of the display light image 5 can be adjusted between the lower limit display position Dl shown by the solid line in FIG. 2 and the upper limit display position Du shown by the broken line in FIG. ..

As shown in FIG. 4, the drive source 36 has a stepping motor 37 and a speed reduction mechanism 38. The stepping motor 37 is a permanent magnet type motor having a claw pole structure. In the stepping motor 37, the rotor magnets 372 rotate integrally with the motor shaft 373 when the A and B two-phase coils 370 and 371 are energized by the energization by the drive signal and excited. As a result, the rotational position of the motor shaft 373 is adjusted to a position corresponding to the electric angle of the drive signal applied to the coils 370 and 371 of the A and B phases.

The speed reduction mechanism 38 is a gear mechanism in which a plurality of spur gears are combined and housed in a casing 380 held by a holding base 341 as shown in FIG. The output shaft 381 of the speed reduction mechanism 38 is coaxially fitted and fixed to the first shaft portion 328a of the rotating shaft 328. As a result, in the reduction mechanism 38, the rotation of the motor shaft 373 is decelerated and transmitted from the output shaft 381 to the rotation shaft 328 of the mirror body 32. As a result, when the motor shaft 373 rotates in the forward direction, the rotation shaft 328 is rotationally driven so that the virtual image display position of the display light image 5 shown in FIG. 2 changes toward the lower lower limit display position Dl. On the other hand, when the motor shaft 373 rotates in the reverse direction, the rotation shaft 328 is rotationally driven so that the virtual image display position of the display light image 5 shown in FIG. 2 changes toward the upper upper limit display position Du. Here, in the speed reduction mechanism 38, a stopper structure (not shown) is provided in order to limit the rotation of the rotation shaft 328 to the drive range corresponding to the lower limit display position Dl and the upper limit display position Du, respectively.

As shown in FIGS. 1 and 3, the elastic member 39 is formed in the shape of a tension coil spring. One end of the elastic member 39 is locked to the mirror body 32. The other end of the elastic member 39 is locked by the fixed base 340 of the bearing body 34. Due to these locking modes, the elastic member 39 is pulled and deformed between the mirror body 32 and the bearing body 34 to generate stability so as to reduce the backlash in the reduction mechanism 38.

The adjustment switch 80 shown in FIGS. 1 and 5 is installed so as to be operable by an occupant around the driver's seat of the vehicle 2. The adjustment switch 80 has operating members 82 and 83 such as a lever type or a push type. The up operation member 82 is operated by an occupant who wants to change the virtual image display position of the display light image 5 upward. In response to this operation, the adjustment switch 80 outputs a command signal that gives an up adjustment command. On the other hand, the down operation member 83 is operated by an occupant who wants to change the virtual image display position of the display light image 5 downward. In response to this operation, the adjustment switch 80 outputs a command signal for giving a down adjustment command.

The control unit 90 is installed outside or inside the housing 10. The control unit 90 includes a display control circuit 92 and a switching circuit 93. The display control circuit 92 is mainly composed of a microcomputer. The display control circuit 92 is electrically connected to the projection unit 20 and the adjustment switch 80. As shown in FIG. 5, the switching circuit 93 has a plurality of transistors as the switching element 94. The collector of each switching element 94 is electrically connected to any of the coils 370 and 371 of the stepping motor 37. The emitter and base of each switching element 94 are electrically connected to the ground terminal of the vehicle 2 and the display control circuit 92, respectively. Each switching element 94 step-changes the drive signal applied to the coils 370 and 371 of each of the A and B phases according to the base signal input by the display control circuit 92 in response to the command signal from the adjustment switch 80.

(Detailed configuration of the mirror body)
The detailed configuration of the mirror body 32 will be described below. As shown in FIGS. 3 and 6, the mirror body 32 has a curved plate shape as a whole. The mirror body 32 includes a back surface 321 on the opposite side of the front surface 320, and four side surfaces (in FIGS. , Forming. Here, the concave front surface 320 and the convex back surface 321 are surfaces along virtual curved surfaces C1 and C2 that are different from each other as shown in FIG. 6 at arbitrary positions facing each other along the optical axis of the mirror body 32. It presents a shape. In particular, in the present embodiment, the second virtual curved surface C2 along the back surface 321 has a curvature smaller than that of the first virtual curved surface C1 along the front surface 320 in each of the vertical direction shown in FIG. 6 and the horizontal direction (not shown). Has been done.

As shown in FIGS. 3 and 6, the mirror body 32 is configured by combining the base material 32a, the reflective film 32b, and the absorbing films 32c and 32d. Specifically, the base material 32a is transparent such as polycarbonate (PC), cyclic olefin polymer (COP), cyclic olefin copolymer (COC), etc. so as to allow light to pass between the front surface 320 and the back surface 321. It is made of transparent resin. On the base material 32a, the first shaft portion 328a and the second shaft portion 328b forming the rotating shaft 328 are integrally resin-molded.

The reflective film 32b is laminated on the surface 320 side of the base material 32a. The reflective film 32b is formed to a thickness of, for example, 200 nm by vapor deposition of a light-reflecting metal such as aluminum. The reflective film 32b is provided on the inner peripheral portion of the surface 320 having a substantially rectangular contour except for the entire outer peripheral portion. As a result, the surface 320 has a surface reflecting surface portion 320a formed including the reflecting film 32b. The front reflecting surface portion 320a has a light blocking action of blocking light transmission to the back surface 321 side and light transmission from the back surface 321 side, and to the windshield 4 (see FIG. 1) side opposite to the back surface 321. It exerts a light reflection action that reflects light.

As shown in FIG. 6, the absorption film 32c is laminated between the base material 32a and the reflection film 32b on the surface 320 side of the base material 32a. The absorbing film 32c is formed by printing a light absorbing resin such as a dark black acrylic resin or the like. The absorbing film 32c is provided on the inner peripheral portion of the surface 320 having a substantially rectangular contour, which has substantially the same shape and the same size as the reflecting film 32b. As a result, the surface 320 has a surface absorbing portion 320c formed including the absorbing film 32c. The front absorbing portion 320c exerts a light absorbing action of absorbing light from the back surface 321 side on the back surface 321 side of the front reflecting surface portion 320a.

Due to the lamination of the reflective film 32b and the absorbing film 32c, the outer peripheral portion where the films 32b and 32c are not formed remains on the surface 320 side of the base material 32a. As a result, the surface 320 has a surface reflecting surface portion 320a and a transmitting surface portion 320b provided around the surface absorbing portion 320c as shown in FIGS. 3 and 6. The transmitting surface portion 320b exerts a light transmitting action of transmitting light to the back surface 321 side. Here, in particular, the surface reflecting surface portion 320a is given a shape and a size that match the outer contour of the incident display light image 5 as shown in FIG. Therefore, the light of the display light image 5 is not substantially incident on the transmission surface portion 320b. In addition to the reflective film 32b and the absorbing film 32c, the surface 320 having the respective portions 320a, 320b, and 320c has, for example, a protective film that protects the surface reflecting surface portion 320a and the light reflectance of the surface reflecting surface portion 320a. It may be formed to include other films such as an increasing reflection film.

As shown in FIGS. 3 and 6, an absorption film 32d is laminated on the lower side surface 322 side of the base material 32a. The absorbing film 32d is formed by printing a light absorbing resin such as a dark black acrylic resin or the like. The absorption film 32d is provided over the entire lower side surface 322. As a result, the lower side surface 322 has a side absorbing portion 322a formed including the absorbing film 32d. The side absorbing portion 322a exerts a light absorbing action of absorbing light from the back surface 321 side and the front surface 320 side.

As shown in FIG. 6, no arbitrary film is laminated on the back surface 321 side of the base material 32a with respect to the front surface 320 side and the lower side surface 322 side as described above. As a result, the back surface 321 has an entire area having a surface shape different from that of the front surface 320 as the back reflection surface portion 321a. As shown in FIGS. 6 and 7, the back reflecting surface portion 321a has a light reflecting action of reflecting the assumed light incident on the transmitting surface portion 320b in the driving range of the mirror body 32 by the driving source 36 to a portion deviating from the transmitting surface portion 320b. And, it exerts a light emitting action of emitting (transmitting) to the side opposite to the surface 320. However, the former light reflection action is exhibited at any part of the back reflection surface portion 321a where the assumed incident light reaches, while the latter light emission action is the incident light of the back reflection surface portion 321a. It is exhibited where the angle is less than the critical angle.

Here, the assumed light incident on the transmission surface portion 320b does not substantially include the light of the display light image 5 projected from the projection unit 20, but is incident from the outside world of the vehicle 2 into the vehicle interior 2a and transmitted through the exit window 14. Includes sunlight. Therefore, in FIGS. 6 and 7, as the assumed light incident on the transmitting surface portion 320b, a light ray of sunlight whose incident angle is limited by the relatively small finite-shaped exit window 14 is typically shown.

As shown in FIGS. 6 and 7, the locations outside the transmitting surface portion 320b to which the assumed incident light is reflected by the back reflecting surface portion 321a are the locations where the reflecting film 32b and the absorbing film 32c are formed and the absorbing film 32d. It becomes the formation place of. That is, the back reflecting surface portion 321a exerts a light reflecting action of reflecting the assumed incident light toward the front reflecting surface portion 320a and the front absorbing portion 320c and a light reflecting action of reflecting the assumed incident light toward the side absorbing portion 322a. Will be done.

(Action effect)
The effects of the HUD device 1 described above will be described below.

According to the HUD device 1, of the front surface 320 of the mirror body 32 that allows light transmission between the front surface 320 and the back surface 321, the periphery of the front reflection surface portion 320a that reflects light toward the windshield 4 side opposite to the back surface 321. Is provided with a transmissive surface portion 320b that transmits light to the back surface 321 side. According to this, the area of the surface reflecting surface portion 320a can be limited to a size required for light reflection of the display light image 5, and the reflection of sunlight by the surface 320 can be reduced as much as possible. Here, in the present embodiment in which a transparent transmissive surface portion 320b that exerts a light transmitting action is formed around the surface reflecting surface portion 320a, a shape or a film that enhances the light reflectance is present around the surface reflecting surface portion 320a. Therefore, it is easy to surely obtain the effect of reducing the reflection of sunlight.

Moreover, according to the HUD device 1, the light transmission to the back surface portion 321 side is blocked by the front reflection surface portion 320a, and the assumed light incident on the transmission surface portion 320b within the drive range of the mirror body 32 by the drive source 36 is the back surface of the back surface portion 321. The reflection surface portion 321a reflects the light to a location outside the transmission surface portion 320b. According to this, not only the reflection portion of sunlight by the back surface 321 can be narrowed down, but also the emission of sunlight from the reflection portion through the transmission surface portion 320b can be restricted.

Therefore, in the HUD device 1 as described above, it is possible to suppress thermal damage and deterioration of visibility caused by the sunlight reflected by the front surface 320 and the back surface 321 reaching the projection unit 20 and the visible area 6 of the occupant, respectively. It becomes.

Further, according to the back reflecting surface portion 321a formed on the back surface 321 by a surface shape portion different from that of the front surface 320 like the HUD device 1, sunlight can be reflected in a direction significantly different from that of the front reflecting surface portion 320a. According to this, it is possible to facilitate the configuration design for restricting the emission of sunlight from the transmissive surface portion 320b and to secure the reliability of the effect of suppressing thermal damage and deterioration of visibility.

Further, in the HUD device 1, the assumed light incident on the transmission surface portion 320b in the drive range of the mirror body 32 by the drive source 36 is reflected by the back reflection surface portion 321a to a location outside the transmission surface portion 320b, so that the light is reflected from the back surface portion 321 side. To the surface reflecting surface portion 320a that blocks the light transmission of the light. According to this, the emission of sunlight from the back reflecting surface portion 321a through the transmitting surface portion 320b can be regulated by the light blocking action after reflection by the back reflecting surface portion 321a, which contributes to the suppression of thermal damage and deterioration of visibility. It becomes possible to do.

Furthermore, the assumed light incident on the transmission surface portion 320b by the HUD device 1 is reflected by the back reflection surface portion 321a and heads toward the front reflection surface portion 320a, so that the light is absorbed on the back surface 321 side of the front reflection surface portion 320a. It will reach the surface absorption unit 320c. According to this, the emission of sunlight from the back reflecting surface portion 321a through the transmitting surface portion 320b can be reliably regulated by the light absorption action after reflection by the back reflecting surface portion 321a, so that thermal damage and deterioration of visibility can be suppressed. It is possible to enhance the effect.

In addition, in the HUD device 1, the assumed light incident on the transmission surface portion 320b in the drive range of the mirror body 32 by the drive source 36 is reflected by the back reflection surface portion 321a to a location outside the transmission surface portion 320b, so that the lower side surface portion 322 To the side absorbing portion 322a that absorbs light at. According to this, the emission of sunlight from the back reflecting surface portion 321a through the transmitting surface portion 320b can be reliably regulated by the light absorption action after reflection by the back reflecting surface portion 321a, so that thermal damage and deterioration of visibility can be suppressed. It is possible to enhance the effect.

In addition, in the HUD device 1, the assumed light incident on the transmission surface portion 320b within the drive range of the mirror body 32 by the drive source 36 is reflected to a portion outside the transmission surface portion 320b and is directed to the side opposite to the surface 320. The light emitting action of is received from the back reflecting surface portion 321a. According to this, since the reflection of sunlight itself, which is a factor of emission through the transmissive surface portion 320b, can be reduced on the back surface 321, it is possible to enhance the effect of suppressing thermal damage and deterioration of visibility.

(Other embodiments)
Although one embodiment of the present invention has been described above, the present invention is not construed as being limited to the embodiment, and can be applied to various embodiments without departing from the gist of the present invention. it can.

As a modification 1, the back reflecting surface portion 321a is along the optical axis of the mirror body 32 of the concave back surface portion 321 as shown in FIG. 8 if it can exhibit a light reflecting action of reflecting to a portion outside the transmitting surface portion 320b. It may be formed by a surface-shaped portion substantially the same as the surface 320 at the facing portion. That is, as a modification 1, the back reflecting surface portion 321a may be formed by the convex back surface 321 along the virtual curved surface C2 which is substantially the same as the virtual curved surface C1 of the concave surface 320.

As a modification 2, the back reflecting surface portion 321a is along the optical axis of the mirror body 32 of the planar back surface 321 as shown in FIG. 9 if it can exhibit a light reflecting action of reflecting to a portion outside the transmitting surface portion 320b. It may be formed by a surface-shaped portion that is different from the surface 320 at the facing portion. That is, as a modification 2, the back reflecting surface portion 321a may be formed by a flat back surface 321 along a virtual plane P2 different from the virtual curved surface C1 of the concave surface 320.

As a modification 3, the back reflecting surface portion 321a has a light reflecting action of reflecting the assumed incident light on the transmitting surface portion 320b toward the front reflecting surface portion 320a and the front absorbing portion 320c, and reflects the assumed incident light toward the side absorbing portion 322a. It is also possible to limit the exertion of either one of the light reflection actions. For example, as the third modification, by not providing the transmitting surface portion 320b above the surface reflecting surface portion 320a, it is possible to limit the exertion of the former light reflecting action. Further, as a modification 3, by not providing the transmitting surface portion 320b below the surface reflecting surface portion 320a, it is possible to limit the exertion of the latter light reflecting action.

As the fourth modification, the planar surface 320 may be adopted in the above-described embodiments and the modifications 1 and 2. As a modification 5, a reflective film that reflects light is laminated on the back surface 321 side of the base material 32a, thereby limiting the exertion of the light emitting action by the back reflecting surface portion 321a that emits light to the side opposite to the front surface 320. You may.

As a modification 6, the side absorbing portion 322a formed including the absorbing film 32d may be provided in addition to the lower side surface 322 among the four side surfaces of the mirror body 32. That is, as a modification 6, the mirror body 32 may have a side absorbing portion 322a by laminating an absorbing film 32d on one to three side surfaces which are a part or four side surfaces which are all.

As a modification 7, at least one of the front absorbing portion 320c and the side absorbing portion 322a is integrally formed with the forming resin of the base material 32a by multicolor resin molding using a light absorbing resin as a forming material thereof. You may be. As a modification 8, at least one of the front absorbing portion 320c and the side absorbing portion 322a may not be provided. In these modifications 7 and 8, at least one of the absorbing films 32c and 32d becomes unnecessary. Further, when at least one object to which the modified examples 7 and 8 are applied is the surface absorbing portion 320c, as the modified example 9, the surface reflecting surface portion 320a is molded with a multicolor resin using a light reflective resin as a forming material thereof. Therefore, it may be formed integrally with the forming resin of the base material 32a.

As a modification 10, the optical system 30 may include a plurality of reflector units 3. As a modification 11, the projection unit 20 is a laser scanner that projects a laser beam that becomes a display light image 5 by a microelectromechanical system, or an image display system that projects a visible light or a laser beam that becomes a display light image 5 by a digital mirror device. And so on. As a modification 12, the display light image 5 may be projected toward a combiner or the like as a “projection member” exclusively installed in the HUD device 1 in the vehicle interior 2a.

1 HUD device, 2 vehicle, 2a cabin, 3 reflector unit, 4 windshield, 5 display light image, 6 viewing area, 10 housing, 20 projection unit, 30 optical system, 32 mirror body, 32a base material, 32b reflection Film, 32c, 32d absorption film, 36 drive source, 320 surface, 320a front reflection surface, 320b transmission surface, 320c front absorption, 321 back surface, 321a back reflection surface, 322 lower surface, 322a side absorption

Claims (6)

The projection unit (20) and the reflector unit (3) are included, and the light of the display light image (5) projected from the projection unit is reflected by the reflector unit to be reflected by the projection member (4) of the vehicle (2). ) Is a head-up display device (1) that displays the display light image as a virtual image so as to be visible to the occupant in the passenger compartment (2a) of the vehicle.
The reflector unit is
A mirror body (32) that forms a front surface (320) and a back surface (321) and allows light to pass between the front surface and the back surface.
A drive source (36) for driving the mirror body is provided.
The surface is
A front reflecting surface portion (320a) that blocks the transmission of light to the back surface side and reflects the light to the projection member side that is opposite to the back surface side.
It has a transmitting surface portion (320b) provided around the front reflecting surface portion and transmitting light to the back surface side.
The back side
A head-up display device having a back reflecting surface portion (321a) that reflects light that is assumed to be incident on the transmitting surface portion within the driving range of the mirror body by the driving source to a portion deviating from the transmitting surface portion. The back side
The head-up display device according to claim 1, wherein the back reflecting surface portion is formed by a surface shape portion different from the surface. The surface reflecting surface portion is
Blocks the transmission of light from the back surface side
The back reflective surface portion is
The head-up display device according to claim 1 or 2, wherein light that is assumed to be incident on the transmitting surface portion in the driving range is reflected toward the surface reflecting surface portion. The surface is
The head-up display device according to claim 3, further comprising a front absorption portion (320c) that absorbs light on the back surface side of the front reflection surface portion. The mirror body
A side surface (322) connecting the front surface and the back surface is formed.
The side surface
It has a side absorption unit (322a) that absorbs light.
The back reflective surface portion is
The head-up display device according to any one of claims 1 to 4, wherein light that is assumed to be incident on the transmitting surface portion in the driving range is reflected toward the side absorbing portion. The back reflective surface portion is
The head-up display device according to any one of claims 1 to 5, wherein light that is assumed to be incident on the transmitting surface portion in the driving range is emitted to a side opposite to the surface.

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