JPWO2020129777A1 - Concave mirror support device and display device - Google Patents

Abstract

Provided is a concave mirror support device and a display device capable of covering a portion requiring shading in a simple configuration. The concave mirror support device includes a concave mirror 31, a shaft portion provided on the concave mirror 31 along an axis, and a case 40. The concave mirror 31 has a reflecting surface R that reflects display light representing an image visually recognized as a virtual image toward a translucent member, and is rotatable about an axis. The case 40 has a bottom portion 41, and an optical path space S through which display light passes is formed on the front side of the bottom portion 41. The concave mirror 31 is attached to the case 40 from the back side of the bottom portion 41 through the opening 41a provided in the bottom portion 41, so that the reflective surface R is located on the front side of the bottom portion 41. The case 40 has a first covering portion 43 and a second covering portion 44 that cover the shaft portion from the front side.

Description

The present invention relates to a concave mirror support device and a display device.

As a conventional concave mirror support device, a device provided in a display device for visually recognizing an image as a virtual image is disclosed in, for example, Patent Document 1. This concave mirror support device has a structure in which a concave mirror that reflects display light representing an image toward a translucent member (for example, the windshield of a vehicle) is attached to the bottom surface of a case from the front side (see FIG. 1 of the same document). ..

Japanese Unexamined Patent Publication No. 2008-180917

In a structure in which a concave mirror is attached to the bottom surface of a case from the front side as in the device disclosed in Patent Document 1, a portion that is not preferable when indicated light such as a shaft for rotating the concave mirror is irradiated (hereinafter, shading is required). It will be necessary to provide a covering member that covers the part) separately from the case. As a result, the number of parts may increase and the configuration may become complicated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a concave mirror support device and a display device capable of covering a portion requiring shading with a simple configuration.

In order to achieve the above object, the concave mirror support device according to the first aspect of the present invention is
A concave mirror that has a reflective surface that reflects display light representing an image that is visually recognized as a virtual image toward a translucent member and that can rotate around a predetermined axis.
A shaft portion provided on the concave mirror and along the axis,
A case having a bottom portion and an optical path space through which the display light passes is formed on the front side of the bottom portion.
The concave mirror is attached to the case from the back side of the bottom portion through an opening provided in the bottom portion, so that the reflective surface is located on the front side of the bottom portion.
The case has a covering portion that covers the shaft portion from the front side.

In order to achieve the above object, the display device according to the second aspect of the present invention is
With the concave mirror support device,
A display device that emits the display light that reaches the concave mirror is provided.

According to the present invention, it is possible to cover a portion requiring shading with a simple structure.

It is a figure which shows the mounting mode of the head-up display (HUD) device which concerns on one Embodiment of this invention on a vehicle. It is a top view which looked at the main part of the HUD apparatus from the front side. It is an exploded perspective view which looked at the main part of the HUD apparatus from the back side. It is a perspective view of the concave mirror unit. It is a perspective view of the main part of the HUD device. It is a perspective view which looked at the case from the back side. It is a top view which looked at the partial structure of the HUD apparatus from the back side. It is a perspective view for demonstrating the mounting mode of the 1st bearing part to a case. It is a perspective view for demonstrating the mounting mode of the 2nd bearing part to a case.

An embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the head-up display device (HUD: Head-Up Display) device 100 according to the present embodiment is arranged, for example, in the dashboard 2 of the vehicle 1. The HUD device 100 emits the display light L toward the windshield 3. The display light L reflected by the windshield 3 is directed toward the user 4 (mainly the driver of the vehicle 1), and the user 4 is made to visually recognize the image represented by the display light L as a virtual image V. The virtual image V is displayed in front of the vehicle 1 via the windshield 3. As a result, the user 4 can observe the virtual image V by superimposing it on the front landscape. The virtual image V displays various information about the vehicle 1 (hereinafter referred to as vehicle information). The vehicle information includes not only the information of the vehicle 1 itself but also the external information of the vehicle 1.

As shown mainly in FIGS. 2 and 3, the HUD device 100 includes a display 10, a plane mirror 20, a concave mirror unit 30, a case 40, a circuit board 50, a first cover 60, and a second cover 70. And. Hereinafter, in the HUD device 100, each configuration will be described with the upper side of the vehicle 1 as the front side and the lower side of the vehicle 1 as the back side. In addition, in FIGS. 1, 3 to 6, 8 and 9, the front side is represented as “F” and the back side is represented as “B”. Further, the concave mirror support device according to the present embodiment is included in the HUD device 100, and includes a concave mirror unit 30, a case 40, and a first cover 60.

By displaying an image, the display 10 emits a display light L representing the image toward the plane mirror 20. The display 10 includes, for example, an LCD (Liquid Crystal Display) and a backlight that illuminates the LCD from behind. The LCD is, for example, a TFT (Thin Film Transistor) type. The backlight is composed of, for example, an LED (Light Emitting Diode), a light guide member, or the like.

The plane mirror 20 is made of, for example, a cold mirror, and is arranged so as to be oblique to the optical axis of the display light L emitted by the display 10 as shown in FIG. The plane mirror 20 reflects the display light L from the display 10 toward the concave mirror 31. The plane mirror 20 is fixed to the case 40 via a holder.

As shown in FIGS. 3 and 4, the concave mirror unit 30 includes a concave mirror 31, a first bearing portion 32, a second bearing portion 33, and a drive portion 34.

The concave mirror 31 has a reflecting surface R that magnifies the display light L from the plane mirror 20 and reflects it toward the windshield 3. As a result, the virtual image V visually recognized by the user 4 is an enlarged image displayed on the display device 10. As shown in FIG. 4, the concave mirror 31 has a pair of a first shaft portion 31a and a second shaft portion 31b formed in a columnar shape, and a flat plate-shaped lever portion 31c. The pair of first shaft portions 31a and second shaft portions 31b project from the side surfaces of the concave mirror 31 in opposite directions, and are provided so as to extend along the axis AX. The lever portion 31c is provided below the second shaft portion 31b located on the left side in FIG. 4 so as to project from the side surface of the concave mirror 31.

The first bearing portion 32 has a pedestal portion 321 and a bearing 322 provided on the front side of the pedestal portion 321 and rotatably supporting the first shaft portion 31a around the axis AX. Further, the first bearing portion 32 is provided with pins P1 and P2 provided in the case 40 and inserted into the holes O1 and O2 described later. The pin P1 is provided so as to project from the bearing 322 to the front side. The pin P2 is provided so as to project from the pedestal portion 321 to the front side.

The second bearing portion 33 has a pedestal portion 331 and a bearing 332 provided on the front side of the pedestal portion 331 and rotatably supporting the second shaft portion 31b around the axis AX. The pedestal portion 331 is provided with holes O3 and O4 provided in the case 40 into which the pins P3 and P4 described later are inserted.

The drive portion 34 has a configuration for rotationally driving the concave mirror 31, and is fixed to the back side of the pedestal portion 331 of the second bearing portion 33. The drive unit 34 has a motor M (see FIG. 3), a housing 341 to which the motor M is mounted, and a sandwiching portion 342 that sandwiches the lever portion 31c. The motor M is composed of, for example, a stepping motor, and is driven by the control of a control unit mounted on the circuit board 50. As shown in FIG. 4, a guide shaft G extending along the direction in which the main surface of the lever portion 31c faces is attached to the housing 341. The sandwiching portion 342 moves the lever portion 31c along the guide shaft G in accordance with the rotational operation of the motor M via a gear mechanism (not shown). By moving the lever portion 31c along the guide shaft G by the sandwiching portion 342 in this way, the drive portion 34 rotationally drives the concave mirror 31 around the axis AX.

The case 40 is formed in a box shape having a light-shielding property by using synthetic resin or metal, and accommodates each of the display 10, the plane mirror 20, and the concave mirror unit 30 in a position satisfying the above functions. As shown mainly in FIG. 5, the case 40 has a bottom portion 41 to which a display 10 and a plane mirror 20 are attached on the front side, an outer peripheral wall portion 42 standing from the outer edge portion of the bottom portion 41 toward the front side, and a first covering portion 43. And a second covering portion 44.

The bottom portion 41 is provided with an opening 41a. The concave mirror 31 is attached to the case 40 from the back side of the bottom portion 41 through the opening 41a, so that the reflective surface R is located on the front side of the bottom portion 41. The opening 41a is formed in a size that does not interfere with the rotational operation of the concave mirror 31. As shown in FIGS. 2 and 5, in the case 40, an optical path space S through which the display light L passes is formed on the front side of the bottom portion 41. As shown in FIG. 5, the first covering portion 43 is located between the right end of the concave mirror 31 and the outer peripheral wall portion 42, and covers the first shaft portion 31a and the first bearing portion 32 from the front side. As shown in FIG. 5, the second covering portion 44 is located between the left end of the concave mirror 31 and the outer peripheral wall portion 42, and covers the second shaft portion 31b, the second bearing portion 33, and the driving portion 34 from the front side.

Here, the mounting mode of the concave mirror 31 to the case 40 will be specifically described.
As shown in FIGS. 6, 7 and 8, an insertion portion 430 into which the first bearing portion 32 is inserted is formed on the back side of the first covering portion 43. The insertion portion 430 has a recessed portion 431 into which the bearing 322 of the first bearing portion 32 is inserted, and a contact portion 432 in contact with the pedestal portion 321. As shown in FIG. 8, the recessed portion 431 is formed in a tapered shape that tapers toward the front side so that the bearing 322 of the first bearing portion 32 can be easily inserted during assembly. The recessed portion 431 is formed so that its center is located on the axis AX. At the center of the recessed portion 431, a hole O1 into which the pin P1 provided in the bearing 322 is inserted is provided. The hole O1 is formed in a size to which the pin P1 is fitted. The contact portion 432 is provided with a hole O2 into which the pin P2 provided in the pedestal portion 331 is inserted. The hole O2 is formed in a shape longer than the hole O1 in the direction orthogonal to the axis AX.

As shown in FIGS. 6, 7 and 9, an insertion portion 440 into which the second bearing portion 33 is inserted is formed on the back side of the second covering portion 44. The insertion portion 440 has a recessed portion 441 into which the bearing 332 of the second bearing portion 33 is inserted, and a contact portion 442 in contact with the pedestal portion 331. As shown in FIG. 9, the recessed portion 441 is formed in a tapered shape that tapers toward the front side so that the bearing 332 of the second bearing portion 33 can be easily inserted during assembly. The recessed portion 441 is formed so that its center is located on the axis AX. The contact portion 442 has a pin P3 that projects toward the back side and is inserted into the hole O3 provided in the second bearing portion 33, and a pin P4 that is inserted into the hole O4 provided in the second bearing portion 33. And are provided. The hole O3 is formed in a size to which the pin P3 is fitted. The hole O4 is formed in a shape longer than the hole O3 in the direction orthogonal to the axis AX. The pin P3 provided on the case 40 is located on the axis AX.

The first bearing portion 32 is inserted into an insertion portion 430 provided on the back side of the case 40, and the pin P1 is inserted into the hole O1 of the case 40 and the pin P2 is inserted into the hole O2 of the case 40, whereby the first bearing portion 32 is inserted into the case 40. It is positioned against it. The first bearing portion 32 positioned in this way is fixed from the back side of the case 40 by a fixing means such as a screw.

The second bearing portion 33 is inserted into the insertion portion 440 provided on the back side of the case 40, and the pin P3 of the case 40 is inserted into the hole O3 and the pin P4 of the case 40 is inserted into the hole O4. It is positioned against it. As described above, since the drive unit 34 is fixed to the second bearing unit 33, the drive unit 34 is also positioned with respect to the case 40. The second bearing portion 33 and the drive portion 34 positioned in this way are fixed from the back side of the case 40 by a fixing means such as a screw. It should be noted that the housing 341 of the drive unit 34 may be provided with a hole communicating with each of the hole O3 and the hole O4, and the pins P3 and P4 of the case 40 may reach the hole via the second bearing portion 33. good.

As described above, the concave mirror 31 is attached to the case 40 from the back side via the first bearing portion 32 and the second bearing portion 33. As described above, the hole O1 and the pin P3 provided on the back side of the case 40 are located on the axis AX. As a result, the concave mirror 31 rotatably supported by the first bearing portion 32 and the second bearing portion 33 can be attached to the case 40 by suppressing an error with respect to the desired axis AX.

Further, as shown in FIG. 6, a substrate fixing portion 41b to which the circuit board 50 is fixed is provided on the back side of the bottom portion 41 of the case 40. The board fixing portion 41b is located on the back side of the portion of the bottom portion 41 where the display 10 is provided.

The circuit board 50 is a printed circuit board on which various circuits are formed and a control unit including a microcomputer is mounted. The control unit controls the overall operation of the HUD device, controls the rotational drive of the concave mirror 31 via the drive unit 34, and controls the display operation of the display 10. The control unit communicates with a system such as an ECU (Electronic Control Unit) that controls each part of the vehicle 1, and displays an image showing vehicle information on the display 10.

The first cover 60 is composed of a member having a light-shielding property, is attached to the case 40 from the back side as shown in FIG. 3, and covers the circuit board 50, the opening, 41a, and the concave mirror unit 30 from the back side. The first cover 60 is fixed to the case 40 by the engaging means H1 using a hook.

The second cover 70 is composed of a member having a light-shielding property, and is attached to the case 40 from the front side by an engaging means H2 using a hook, as shown in FIG. The second cover 70 is provided with an injection port 71 (see FIG. 1) that opens toward the windshield 3. A translucent cover (not shown) is attached to the injection port 71.

In the HUD device 100 having the above configuration, the display light L emitted from the display 10 and reflected in the order of the plane mirror 20 and the concave mirror 31 is emitted to the outside from the ejection port 71 and heads toward the windshield 3. When the display light L is reflected by the windshield 3, a virtual image V is displayed in front of the windshield 3 when viewed from the user 4.

Here, among the manufacturing methods of the HUD device 100, an example of a step of attaching the concave mirror 31 to the case 40 will be mainly described.
First, the concave mirror unit 30 that has been assembled and unitized in advance is assembled to the back side of the case 40 so that the concave mirror 31 is located in the opening 41a. Specifically, the first bearing portion 32 of the concave mirror unit 30 is inserted into the insertion portion 430 provided on the back side of the case 40. At this time, the pin P1 of the first bearing portion 32 is inserted into the hole O1 of the case 40, and the pin P2 of the first bearing portion 32 is inserted into the hole O2 of the case 40. Further, the second bearing portion 33 of the concave mirror unit 30 is inserted into the insertion portion 440 provided on the back side of the case 40. At this time, the pin P3 of the case 40 is inserted into the hole O3 of the second bearing portion 33, and the pin P4 of the case 40 is inserted into the hole O4 of the second bearing portion 33. As a result, the concave mirror unit 30 is positioned with respect to the case 40.
After being positioned in this way, the first bearing portion 32 is fixed to the case 40 from the back side by a fixing means such as a screw. The second bearing portion 33 and the drive portion 34 are fixed to the case 40 from the back side of the case 40 by a fixing means such as a screw.
Then, the first cover 60 that covers the circuit board 50 fixed to the case 40, the opening 41a, and the concave mirror unit 30 from the back side is attached to the case 40 by the engaging means H1. The step of fixing the circuit board 50 to the case 40 may be before or after the step of attaching the concave mirror unit 30 to the case 40.
As described above, the concave mirror unit 30 is attached to the case 40, and the main member on the back side of the case 40 is covered and protected by the first cover 60.

(1) The concave mirror support device included in the HUD device 100 described above is provided in the concave mirror 31 and the concave mirror 31, and has a shaft portion (first shaft portion 31a, second shaft portion 31b) along the axis AX and a case. 40 and. The concave mirror 31 has a reflecting surface R that reflects the display light L representing an image visually recognized as a virtual image V toward the windshield 3 (an example of a translucent member), and is rotatable about a predetermined axis AX. .. The case 40 has a bottom portion 41, and an optical path space S through which the display light L passes is formed on the front side of the bottom portion 41. The concave mirror 31 is attached to the case 40 from the back side of the bottom portion 41 through the opening 41a provided in the bottom portion 41, so that the reflective surface R is located on the front side of the bottom portion 41. The case 40 has a covering portion (first covering portion 43, second covering portion 44) that covers the shaft portion from the front side.
As described above, since the concave mirror 31 is attached from the back side of the case 40 having the covering portion, it is not necessary to provide the covering member for covering the light-shielding necessary portion separately from the case, and the increase in the number of parts can be suppressed. Therefore, according to the concave mirror support device having the above configuration, it is possible to cover the light-shielding necessary portion with a simple configuration.

(2) Specifically, the concave mirror support device includes a bearing portion (first bearing portion 32, second bearing portion 33) that rotatably supports the shaft portion, and the bearing portion is fixed to the cover portion from the back side. There is.

(3) Specifically, the shaft portion includes a pair of the first shaft portion 31a and the second shaft portion 31b, and the bearing portion includes the first bearing portion 32 that supports the first shaft portion 31a and the second shaft portion. There is a second bearing portion 33 that supports 31b, and the concave mirror support device includes a drive portion 34 that rotationally drives the concave mirror 31. Further, as the covering portion, there are a first covering portion 43 that covers the first shaft portion 31a from the front side, and a second covering portion 44 that covers the second shaft portion 31b and the driving portion 34 from the front side.

(4) In the concave mirror support device, a concave mirror having a concave mirror 31, a shaft portion (first shaft portion 31a, second shaft portion 31b), a bearing portion (first bearing portion 32, second bearing portion 33), and a drive portion 34. The unit 30 is attached to the case 40 from the back side of the bottom 41.
As described above, since the unitized concave mirror unit 30 can be attached from the back side of the case 40, it is easy to assemble. Further, according to the configuration, the assembled concave mirror unit 30 can be fixed by a fixing means such as a screw in one direction from the back side to the front side.

(5) The concave mirror support device is attached to the circuit board 50 provided on the back side of the bottom 41 and the case 40 from the back side, and at least the first cover 60 that covers the circuit board 50, the opening 41a, and the concave mirror 31 from the back side. (An example of a cover) and.
With this configuration, the mounting direction of the concave mirror 31, the mounting direction of the circuit board 50, and the mounting direction of the first cover 60 with respect to the case 40 can be set to one direction from the back side to the front side, so that the efficiency in the assembly work process is improved. Can be planned.

(6) The HUD device 100 (an example of a display device) includes the above-mentioned concave mirror support device and a display 10 that emits display light L that reaches the concave mirror 31.

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

Further, the display 10 is not limited to the one using the LCD, and the one using the OLED (Organic Light-Emitting Diode) may be adopted. Further, the display 10 may use, for example, a reflective display device such as a DMD (Digital Micro mirror Device) or LCOS (Liquid Crystal On Silicon).

Further, a plane mirror other than the plane mirror 20 may be provided in the optical path of the display light L connecting the plane mirror 20 and the concave mirror 31. The number of plane mirrors to be used and how to fold the optical path of the display light L can be appropriately changed according to the design.

Further, the projection target (translucent member) of the display light L is not limited to the windshield 3 of the vehicle 1, and may be a combiner composed of a plate-shaped half mirror, a hologram element, or the like.

Further, the type of the vehicle 1 on which the HUD device 100 is mounted is not limited, and can be applied to various vehicles such as motorcycles and motorcycles. Further, the HUD device 100 may be mounted on a vehicle other than the vehicle 1, such as an aircraft, a ship, and a snowmobile.

In the above description, in order to facilitate the understanding of the present invention, the description of known technical matters has been omitted as appropriate.

100 ... Head-up display (HUD) device 1 ... Vehicle, 2 ... Dashboard, 3 ... Front glass, 4 ... User L ... Display light, V ... Virtual image 10 ... Display 20 ... Plane mirror 30 ... Concave mirror unit 31 ... Concave mirror, R ... Reflective surface, AX ... Axis line 31a ... 1st shaft part, 31b ... 2nd shaft part, 31c ... Lever part 32 ... 1st bearing part 321 ... Pedestal part, P2 ... Pin 322 ... Bearing, P1 ... Pin 33 ... 2nd Bearing part 331 ... Pedestal part, O3, O4 ... Hole 332 ... Bearing 34 ... Drive part 341 ... Housing, 342 ... Insertion part, M ... Motor, G ... Guide shaft 40 ... Case, S ... Optical path space 41 ... Bottom, 41a ... Opening, 41b ... Board fixing part 43 ... First covering part 430 ... Inserting part 431 ... Depressed part, O1 ... Hole 432 ... Contact part, O2 ... Hole 44 ... Second covering part 440 ... Inserting part 441 ... Depressed part 442 ... Contact part, P3, P4 ... Pin 50 ... Circuit board 60 ... First cover 70 ... Second cover, 71 ... Injection port

Claims (6)

A concave mirror that has a reflective surface that reflects display light representing an image that is visually recognized as a virtual image toward a translucent member and that can rotate around a predetermined axis.
A shaft portion provided on the concave mirror and along the axis,
A case having a bottom portion and an optical path space through which the display light passes is formed on the front side of the bottom portion.
The concave mirror is attached to the case from the back side of the bottom portion through an opening provided in the bottom portion, so that the reflective surface is located on the front side of the bottom portion.
The case has a covering portion that covers the shaft portion from the front side.
Concave mirror support device. A bearing portion that rotatably supports the shaft portion is provided.
The bearing portion is fixed to the covering portion from the back side.
The concave mirror support device according to claim 1. The shaft portion includes a pair of a first shaft portion and a second shaft portion.
The bearing portion includes a first bearing portion that supports the first shaft portion and a second bearing portion that supports the second shaft portion.
A drive unit for rotationally driving the concave mirror is provided.
The covering portion includes a first covering portion that covers the first shaft portion from the front side, and a second covering portion that covers the second shaft portion and the driving portion from the front side.
The concave mirror support device according to claim 2. A concave mirror unit having the concave mirror, the shaft portion, the bearing portion, and the drive portion is attached to the case from the back side of the bottom portion.
The concave mirror support device according to claim 3. The circuit board provided on the back side of the bottom and
It is attached to the case from the back side and includes at least a cover that covers the circuit board, the opening, and the concave mirror from the back side.
The concave mirror support device according to any one of claims 1 to 4. The concave mirror support device according to any one of claims 1 to 5.
A display that emits the display light that reaches the concave mirror, and comprises.
Display device.

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