WO2021149792A1 - Head-up display - Google Patents

Abstract

The present invention allows a plane mirror to be held by a holder with substantially no play and in such a way as to facilitate assembly. Disclosed is a head-up display (1) provided with: a housing (2); an illumination device (6); a display unit (3) that is illuminated by the illumination device and emits display light; a plane mirror (41) that reflects the display light; and a holder (42) that holds the plane mirror. When a direction perpendicular to a reflection face of the plane mirror is a first direction (A), the holder comes into contact with the plane mirror and deforms elastically to constrain: displacement of the plane mirror with respect to the holder in the first direction; and displacement of the plane mirror with respect to the holder around an axis parallel to the first direction.

Description

Head-up display

This disclosure relates to a head-up display.

A head-up display with a plane mirror in front of the liquid crystal display is disclosed.

Japanese Unexamined Patent Publication No. 2013-174855

However, with the above-mentioned conventional technology, it is difficult to hold the plane mirror substantially without play in the holder in a manner in which the assembling property is good.

Therefore, it is an object of the present disclosure to hold the plane mirror substantially without play in the holder in a manner in which the assembling property is good.

On one side, the housing (2) and
Lighting device (6) and
A display (3) that emits display light illuminated by the lighting device, and
A plane mirror (41) that reflects the display light and
A holder (42) for holding the plane mirror is provided.
When the direction perpendicular to the reflection surface of the plane mirror is the first direction (A), the holder is elastically deformed in contact with the plane mirror, so that the displacement of the plane mirror in the first direction with respect to the holder. And a head-up display (1) that constrains the displacement of the plane mirror with respect to the holder about an axis parallel to the first direction.

According to the present disclosure, it is possible to hold the plane mirror substantially without play in the holder in a manner in which the assembling property is good.

It is a perspective view which shows the internal structure of the head-up display by one Example from the upper side. It is a perspective view which shows the head-up display from the lower side. It is a perspective view which shows the TFT panel unit. It is a perspective view which shows the backlight unit and a heat dissipation member. It is a figure which shows roughly the vehicle-mounted state of the head-up display in the vehicle side view. It is a perspective view of the reflector unit in a single item state. It is an exploded perspective view of the reflector unit. It is a perspective view of the holder as a single item viewed from the front side in the insertion direction. It is explanatory drawing of the shape of the 2nd urging part. It is the perspective view from the different direction which expanded the Q1 part of FIG. It is sectional drawing which shows the reflector of 1st Example. It is an operation explanatory view of a plane mirror. It is sectional drawing which shows the plane mirror of 2nd Example. It is sectional drawing which shows the plane mirror of 3rd Example. It is sectional drawing which shows the plane mirror of 4th Example. It is explanatory drawing of the angle R of the reflection layer which enlarged the Q2 part of FIG.

Hereinafter, each embodiment will be described in detail with reference to the attached drawings. In FIG. 1A and the like, for the sake of legibility, a plurality of parts or parts having the same attribute may have reference numerals only partially attached to them.

[Head-up display configuration]
FIG. 1A is a perspective view showing the internal configuration of the head-up display 1 according to the embodiment from above. FIG. 1B is a perspective view showing the head-up display 1 from below. FIG. 1C is a perspective view showing the TFT panel unit 3. FIG. 1D is a perspective view showing the backlight unit 6 and the heat radiating member 7. FIG. 2 is a diagram schematically showing a vehicle-mounted state of the head-up display 1 when viewed from the side of the vehicle. Note that in FIGS. 1A and 1B, the illustration of some components of the head-up display 1 is omitted. In FIG. 1A and the like, the X direction, the Y direction, and the Z direction, which are three directions orthogonal to each other, are defined in the right-handed system. In the following, formally, the Z direction is the vertical direction, the positive side is the upper side, and the negative side is the lower side.

The head-up display 1 is mounted in the instrument panel 9 of the vehicle. The head-up display 1 may be mounted in a direction in which the Y direction of FIG. 1A substantially corresponds to the vehicle width direction.

The head-up display 1 includes a case 2, a TFT (Thin Film Transistor) panel unit 3 (an example of a display), a reflector unit 4, a concave mirror 5, a backlight unit 6 (an example of a lighting device), and heat dissipation. Includes member 7.

The case 2 forms the housing of the head-up display 1. The case 2 is a lower case that forms the lower part of the housing of the head-up display 1. The case 2 is combined with an upper case (not shown in FIG. 1A).

Case 2 is formed of, for example, resin. The case 2 may be formed of two or more members.

The TFT panel unit 3 is fixed to the case 2. The TFT panel unit 3 is a display device that uses the light from the backlight unit 6 as a backlight to emit display light according to the display image. The TFT panel unit 3 of this embodiment includes a dot matrix type TFT (Thin Film Transistor) panel. The display image is arbitrary, and may be, for example, an image representing navigation information, various vehicle information, and the like.

The reflector unit 4 is fixed to the case 2. The reflecting mirror unit 4 includes a plane mirror 41, and reflects the display light emitted from the TFT panel unit 3 toward the concave mirror 5.

The concave mirror 5 is fixed to the case 2. The concave mirror 5 is rotatably supported with respect to the case 2 so that the vertical position of the area exposed to the display light in the windshield WS can be adjusted. The concave mirror 5 reflects the display light reflected by the reflector unit 4 and emits it from an outlet provided in the upper case (not shown) so as to face the windshield WS of the vehicle VC.

The backlight unit 6 is provided behind the TFT panel unit 3 (negative side in the Y direction). The backlight unit 6 includes, for example, a substrate 60 on which an LED 62 (Light Emitting Diode) is mounted. The substrate 60 may be placed on the heat radiating member 7 as shown in FIG. 1D. The backlight unit 6 cooperates with the TFT panel unit 3 to generate display light.

The heat radiating member 7 is formed of a material having high heat transfer properties such as aluminum. The heat radiating member 7 is attached to the case 2 in such a manner that the fins 71 are exposed to the outside of the case 2. The heat radiating member 7 has a function of radiating heat generated from the backlight unit 6. The heat radiating member 7 releases heat to the air flowing outside the case 2.

In such a head-up display 1, as shown in FIG. 2, when the windshield WS is irradiated with the display light, the driver who drives the vehicle VC obtains the windshield WS in front of the windshield WS by the irradiation. The displayed display image (virtual image display) VI can be seen. As a result, the driver can visually recognize the displayed image VI by superimposing it on the front scenery, and can grasp the vehicle information and the like in a mode in which the line of sight movement is small, and the convenience and safety are improved.

[Construction of reflector unit]
FIG. 3 is a perspective view of the reflector unit 4 in a single item state, and FIG. 4 is an exploded perspective view of the reflector unit 4. FIG. 5 is a perspective view of the holder 42 as a single item as viewed from the front side in the insertion direction (see arrow R1 in FIG. 4). FIG. 6 is an explanatory diagram of the shape of the second urging portion 432. FIG. 7 is an explanatory view of the opening on the entrance side, and is an enlarged perspective view of the Q1 portion of FIG. 4 from different directions.

In FIG. 4, the A direction, the B direction, and the C direction are defined separately from the X direction, the Y direction, and the Z direction described above. The A direction (an example of the first direction) is a direction perpendicular to the reflection surface of the plane mirror 41, and the terms "A1 side" and "A2 side" refer to a relative positional relationship with respect to a certain member. The A1 side represents the side of the plane mirror 41 from the center position in the A direction toward the reflection surface of the plane mirror 41, and the A2 side represents the side of the plane mirror 41 from the center position in the A direction toward the back surface of the plane mirror 41. Represented relatively. The B direction (an example of the second direction) is one direction orthogonal to the A direction, and corresponds to the insertion direction of the plane mirror 41 into the holder 42 at the time of assembly. Further, the B1 side relatively represents the back side in the insertion direction, and the B2 side relatively represents the front side in the insertion direction. The C direction (an example of the third direction) is a direction orthogonal to both the A direction and the B direction, and the C1 side relatively represents the side of the plane mirror 41 from the center position in the C direction toward the side L4, and C2. The side represents the side of the plane mirror 41 from the center position in the C direction toward the side L3 side relatively.

The reflector unit 4 includes a plane mirror 41 and a holder 42.

As described above, the plane mirror 41 forms a reflecting surface that reflects the display light emitted from the TFT panel unit 3 toward the concave mirror 5. The plane mirror 41 has a substantially constant thickness and has a rectangular outer shape. In this embodiment, as an example, the plane mirror 41 has a trapezoidal shape in which the sides L1 and L2 are parallel, the angle formed by the side L1 and the side L4 is 90 degrees, and the angle formed by the side L1 and the side L3 is larger than 90. big. That is, in the plane mirror 41, the angle formed by the side surface on the side L1 side and the side surface on the side L4 side is 90 degrees, and the angle formed by the side surface on the side L1 side and the side surface on the side L3 side is larger than 90 degrees. The side surface on the side L1 side and the side surface on the side L4 side may have a so-called pin angle or may be connected by a curved surface (R surface). The same applies to the side surface on the side L1 side and the side surface on the side L3 side.

The holder 42 is formed of, for example, resin. The holder 42 holds the plane mirror 41. The holder 42 is fixed to the case 2. Therefore, the plane mirror 41 is supported by the case 2 via the holder 42.

In this embodiment, the holder 42 abuts on the plane mirror 41 and is elastically deformed so that the displacement of the plane mirror 41 with respect to the holder 42 in the A direction and the axis of the plane mirror 41 with respect to the holder 42 parallel to the A direction (for example, the center of gravity). It has a function of restraining the displacement around (the axis parallel to the A direction) passing through.

Specifically, the holder 42 includes a base portion 420, a first portion 421, a second portion 422, a third portion 423, a first urging portion 431, a second urging portion 432, and a third. The urging unit 433, the first guide unit 441, the second guide unit 442, and the third guide unit 443 are included.

The base portion 420 extends in the area where the plane mirrors 41 overlap when viewed in the A direction. The base portion 420 has a planar shape.

The base portion 420 preferably has ribs 4201 arranged in a honeycomb shape on the side (A1 side) facing the plane mirror 41 in the A direction, as shown in FIG. The rib 4201 is erected on the flat surface portion 4200. As a result, the rigidity of the base portion 420 and the holder 42 can be increased while reducing the thickness of the flat portion 4200 of the base portion 420 (and thereby reducing the mass of the base portion 420). The rib 4201 may be formed of another pattern (a pattern other than the honeycomb shape) as long as it fulfills the function of increasing the rigidity.

The base portion 420 further has a frame portion 4202 whose height (height in the A direction) from the flat surface portion 4200 is slightly larger than that of the rib 4201. The frame portion 4202 extends in the vicinity of each of the first urging portion 431, the second urging portion 432, and the third urging portion 433, which will be described later, and has a function of ensuring the required rigidity.

The base portion 420 has a window portion 4205 penetrating in the A direction within a range in which the plane mirror 41 overlaps when viewed in the A direction. The window portion 4205 is provided so that the state in which the plane mirror 41 is inserted into the holder 42 in a desired manner can be confirmed. Therefore, the window portion 4205 is preferably provided on the back side in the insertion direction. In this case, by confirming that the plane mirror 41 is visible through the window portion 4205, it is possible to confirm that the plane mirror 41 is inserted into the holder 42 in a desired manner. In this embodiment, as an example, three window portions 4205 are provided side by side in the C direction.

The first portion 421 is separated from the base portion 420 toward the A1 side in the A direction by a distance slightly larger than the thickness of the plane mirror 41. Therefore, the first portion 421 extends in a range overlapping the base portion 420 when viewed in the A direction. In this embodiment, the first portion 421 is provided so as to face the portions on both sides of the base portion 420 in the C direction and the portions on the B direction B1 side of the base portion 420 so as to face each other in the A direction.

The first portion 421 abuts in the A direction with respect to the surface of the plane mirror 41 on the reflecting surface side at the edges of the plane mirror 41 on the three sides (sides L1, side L3, and side L4). The first portion 421 has a function of restraining the displacement of the plane mirror 41 in the A direction with respect to the holder 42 in cooperation with the first urging portion 431 described later. That is, the first portion 421 abuts on the surface of the plane mirror 41 on the reflection surface side from the A direction A1 side to regulate the displacement of the plane mirror 41 toward the A direction A1 side. Hereinafter, such a function of restraining the displacement in the A direction is also referred to as an “A direction displacement restraining function”.

In this embodiment, as described above, the first portion 421 extends in a C shape when viewed in the A direction, and therefore extends along the three sides (side L1, side L3, and side L4) of the plane mirror 41. , Can come into contact with the plane mirror 41. As a result, the above-mentioned A-direction displacement restraint function can be effectively enhanced. However, in the modified example, the first portion 421 may be provided in another embodiment. For example, the first portion 421 may be provided so as to face only the portions on both sides of the base portion 420 in the C direction in the A direction.

As shown in FIG. 5, the second portion 422 is erected on the A1 side in the A direction at a position (boundary position) on the back side (B1 side in the B direction) of the base portion 420 in the insertion direction. In this embodiment, the second portion 422 does not extend continuously in the C direction, but is formed in such a manner that an opening 4221 is formed between them.

The second portion 422 abuts in the B direction with respect to the side surface of the plane mirror 41 on the back side (that is, the side L1 side) in the insertion direction. The second portion 422 has a function of restraining the displacement of the plane mirror 41 in the B direction with respect to the holder 42 in cooperation with the second urging portion 432 described later. That is, the second portion 422 abuts on the side surface of the plane mirror 41 on the B direction B1 side from the B direction B1 side to regulate the displacement of the plane mirror 41 toward the B direction B1 side. Hereinafter, such a function of restraining the displacement in the B direction is also referred to as a “displacement restraining function in the B direction”.

In this embodiment, as described above, the second portion 422 has an opening 4221 in between, but is arranged along the C direction in such a manner that it faces the entire side surface of the plane mirror 41 on the B direction B1 side. Therefore, the above-mentioned B-direction displacement restraint function can be effectively enhanced. However, in the modified example, the second portion 422 may be provided in another embodiment.

As shown in FIG. 5, the third portion 423 is erected on the A1 side in the A direction at the position (boundary position) on the C1 side in the C direction (an example of the first side) in the base portion 420. In this embodiment, the third portion 423 is formed in a mode continuous with the first portion 421 on the C1 side in the C direction (a mode in which an L-shaped cross section is formed when viewed in the B direction). It extends in the B direction in the same range as the first portion 421 on the C1 side in the C direction.

The third portion 423 abuts in the C direction with respect to the side surface of the plane mirror 41 on the C1 side in the C direction. The third portion 423 has a function of restraining the displacement of the plane mirror 41 in the C direction with respect to the holder 42 in cooperation with the third urging portion 433 described later. That is, the third urging portion 433 regulates the displacement of the plane mirror 41 toward the C1 side in the C direction by abutting the side surface of the plane mirror 41 on the C1 side in the C direction from the C1 side in the C direction. Hereinafter, such a function of restraining the displacement in the C direction is also referred to as a “displacement restraining function in the C direction”.

In the present embodiment, the third portion 423 is arranged along the B direction in such a manner that the third portion 423 faces substantially the entire side surface of the plane mirror 41 on the C1 side in the C direction, so that the above-mentioned displacement restraint function in the C direction can be effectively performed. Can be enhanced. However, in the modified example, the third portion 423 may be provided in another embodiment.

The first urging unit 431 is provided within a range that overlaps the plane mirror 41 when viewed in the A direction. In this embodiment, as an example, as shown in FIG. 4, two first urging portions 431 are provided on both sides of the C direction in a range overlapping the plane mirror 41 when viewed in the A direction.

The first urging portion 431 abuts on the back surface of the plane mirror 41 and elastically deforms mainly toward the A2 side in the A direction to apply a force in the A direction to the plane mirror 41. Specifically, the first urging portion 431 has a claw-shaped shape, and the tip portion is located on the A1 side in the A direction with respect to the base portion 420 in the state before the plane mirror 41 is assembled to the holder 42. When the plane mirror 41 is assembled to the holder 42, the tip end portion of the first urging portion 431 is displaced toward the A2 side in the A direction, and the first urging portion 431 is elastically deformed. As a result, the first urging unit 431 can apply a force toward the plane mirror 41 toward the A1 side in the A direction. As described above, the displacement of the plane mirror 41 toward the A1 side in the A direction is regulated by the first portion 421. In this way, the first urging unit 431 cooperates with the first portion 421 to realize the above-mentioned A-direction displacement restraint function.

In this embodiment, as described above, the first urging portions 431 are provided at four locations so as to act on both sides of the plane mirror 41 in the C direction and both sides in the B direction. As a result, the above-mentioned A-direction displacement restraint function can be effectively enhanced on both sides in the C direction and both sides in the B direction. However, in the modified example, the first urging portion 431 may be provided in another embodiment. For example, the first urging portion 431 may be additionally provided in the vicinity of the first portion 421 on the B1 side in the B direction.

The second urging portion 432 is provided on the B2 side in the B direction in a range overlapping the plane mirror 41 when viewed in the A direction. In this embodiment, as an example, three second urging portions 432 are provided side by side in the C direction as shown in FIG.

The second urging portion 432 abuts on the side portion of the plane mirror 41 on the front side (B direction B2 side) in the insertion direction and elastically deforms to apply a force in the B direction to the plane mirror 41. Specifically, as shown in FIG. 6, the second urging portion 432 has a claw-shaped shape and has a return portion 4322 that engages with the side portion 418 on the front side in the insertion direction of the plane mirror 41. When the plane mirror 41 is assembled to the holder 42, the second urging portion 432 is displaced toward the A2 side in the A direction, and the second urging portion 432 is elastically deformed. The return portion 4322 is a side portion 418 on the B direction B2 side of the plane mirror 41 (to be exact, the A direction A2 side of the side portion 418) in a state where the second urging portion 432 is elastically deformed mainly toward the A direction A2 side. Contact the corners of). As a result, the second urging unit 432 can apply a force to the plane mirror 41 toward the B1 side in the B direction. As described above, the displacement of the plane mirror 41 toward the B1 side in the B direction is regulated by the second portion 422. In this way, the second urging portion 432 cooperates with the second portion 422 to realize the above-described B-direction displacement restraint function.

In this embodiment, as described above, three second urging portions 432 are provided at substantially even intervals in the C direction. As a result, the above-mentioned B-direction displacement restraint function can be effectively enhanced. However, in the modified example, the second urging portion 432 may be provided in another embodiment. For example, in the second urging unit 432, one of the three may be omitted. In this embodiment, the three second urging portions 432 have substantially the same form as each other, but the detailed portions may be different.

By the way, unlike the first urging unit 431 and the third urging unit 433, the second urging unit 432 is located on the B direction B2 side with respect to the plane mirror 41 in order to realize the above-mentioned B direction displacement restraint function. Must be located. This means that when the plane mirror 41 is inserted into the holder 42 at the time of assembly, the second urging portion 432 interferes with the plane mirror 41 before the first urging portion 431 and the third urging portion 433. .. Therefore, the second urging portion 432 is more likely to affect the assembling property when the plane mirror 41 is inserted into the holder 42 at the time of assembling than the first urging portion 431 and the third urging portion 433.

In this regard, in the present embodiment, as described below, the second urging portion 432 that can improve the assembling property when the plane mirror 41 is inserted into the holder 42 while enhancing the above-mentioned B direction displacement restraining function. The configuration of is realized.

Specifically, with reference to FIG. 6, in the second urging portion 432, the edge portion 4320 on the front side in the insertion direction is larger than the edge portion 4421 on the front side in the insertion direction in the second guide portion 442. , The distance from the back surface of the plane mirror 41 in the A direction is large. That is, the edge portion 4320 of the second urging portion 432 is located on the A2 side in the A direction with respect to the edge portion 4421 of the second guide portion 442. As a result, when the plane mirror 41 is inserted into the holder 42 at the time of assembly, the possibility that the plane mirror 41 interferes with the second urging portion 432 before the second guide portion 442 is reduced, and the assembling property is improved.

Further, the second urging portion 432 has a first inclined surface 43221, a first plane 43222, a second plane 4328, and a second inclined surface 4329 on the A1 side in the A direction.

The first inclined surface 43221 is an inclined direction toward the A direction A2 side as it goes from the edge portion 4320 to the B direction B1 side when viewed in the C direction.

The first plane 43222 is perpendicular to the back surface of the plane mirror 41. The first plane 43222 is continuous with respect to the first inclined surface 43221 from the B2 side in the B direction. The first plane 43222 cooperates with the first inclined surface 43221 to form the return portion 4322 described above. In this case, the side portion 418 of the plane mirror 41 on the B direction B2 side (to be exact, the corner portion of the side portion 418 on the A direction A2 side) abuts on the first inclined surface 43221.

In this embodiment, since the first plane 43222 is perpendicular to the back surface of the plane mirror 41, the first plane 43222 is a plane mirror even if the plane mirror 41 abutting on the first inclined surface 43221 tries to be displaced toward the B2 side in the B direction. It becomes easy to lock 41. As a result, the above-mentioned B-direction displacement restraint function can be effectively enhanced.

The second plane 4328 is connected to the first plane 43222 from the B2 side in the B direction. The second plane 4328 is parallel to the back surface of the plane mirror 41. As shown in FIG. 6, the second plane 4328 may be connected to the first plane 43222 via a curved surface 43281 having a relatively small radius of curvature. The center of curvature of the curved surface 43281 is on the A2 side. By making the radius of curvature of the curved surface 43281 relatively small, the above-mentioned B-direction displacement restraint function can be ensured.

The second inclined surface 4329 is connected to the second plane 4328 from the B2 side in the B direction. The second inclined surface 4329 has an inclined direction opposite to that of the first inclined surface 43221. That is, the second inclined surface 4329 is an inclined direction toward the A1 side as it goes from the edge 4320 toward the B direction B1 side when viewed in the C direction. The slope of the second inclined surface 4329 may be smaller than that of the first inclined surface 43221. As a result, when the plane mirror 41 is inserted into the holder 42 at the time of assembly, the plane mirror 41 is less likely to be caught on the second inclined surface 4329, and the assembling property is improved.

The second inclined surface 4329 may be connected to the second plane 4328 via a curved surface 44211 having a relatively large radius of curvature. The center of curvature of the curved surface 44211 is on the A2 side. By making the radius of curvature of the curved surface 44211 relatively large, when the plane mirror 41 is inserted into the holder 42 at the time of assembly, the plane mirror 41 is less likely to be caught in the connecting portion between the second inclined surface 4329 and the second plane 4328, and the assembling property is improved. It will be good.

As shown in FIGS. 3 and 4, the third urging portion 433 is provided on the C2 side in the C direction (an example of the second side) and the B1 side in the B direction with respect to the base portion 420. The third urging portion 433 abuts on the side surface of the plane mirror 41 on the C2 side in the C direction and elastically deforms mainly toward the C2 side in the C direction to apply a force in the C direction to the plane mirror 41. Specifically, the third urging portion 433 has a claw-shaped shape, and the tip portion protrudes toward C1 in the C direction. When the plane mirror 41 is assembled to the holder 42, the tip end portion of the third urging portion 433 is displaced toward the C2 side in the C direction, and the third urging portion 433 is elastically deformed. As a result, the third urging unit 433 can apply a force toward the C1 side in the C direction to the plane mirror 41. As described above, the displacement of the plane mirror 41 toward the C1 side in the C direction is regulated by the third portion 423. In this way, the third urging unit 433 cooperates with the third portion 423 to realize the above-mentioned C-direction displacement restraint function.

In this embodiment, only one third urging unit 433 is provided, but two or more may be provided.

Here, the third urging portion 433 is preferably provided only on the back side in the insertion direction (B1 side in the B direction) of the side surfaces of the plane mirror 41 on the C2 side in the C direction, as shown in FIGS. 3 and 4. Contact. As a result, when the plane mirror 41 is inserted into the holder 42 at the time of assembly, the plane mirror 41 interferes with the third urging portion 433 near the final stage of insertion (as a result, the third urging portion 433 is elastically deformed). Therefore, the assembling property is improved as compared with the case where the plane mirror 41 interferes with the third urging portion 433 at the start stage of insertion.

As shown in FIG. 7, the first guide portion 441 is provided on the B2 side in the B direction with respect to the first portion 421. The first guide portion 441 has a form continuous with respect to the first portion 421 from the B2 side in the B direction. When the plane mirror 41 is inserted into the holder 42 at the time of assembly, the first guide portion 441 positions the side portions of the plane mirror 41 on both sides in the C direction at appropriate positions in the A direction (for example, the surface on the A1 side in the A direction is the first portion 421). It functions to be positioned at the position (position in contact with the surface on the A2 side in the A direction). In order to enhance such a function, the first guide portion 441 is preferably the height in the A direction (smaller than the thickness of the plane mirror 41) of the space formed between the first portion 421 and the base portion 420 in the A direction. It has a tapered portion 4211 such that the width becomes larger toward the B2 side in the B direction. Although FIG. 7 shows the first guide portion 441 on the C1 side in the C direction, the same applies to the first guide portion 441 on the C2 side in the C direction. However, in the modified example, one or both of the first guide portions 441 on the C1 side and the C2 side in the C direction may be omitted.

As shown in FIG. 6, the second guide portion 442 is provided on the B2 side in the B direction with respect to the base portion 420. The second guide portion 442 is continuous with respect to the base portion 420 from the B2 side in the B direction. When the plane mirror 41 is inserted into the holder 42 at the time of assembly, the second guide portion 442 positions the back surface of the plane mirror 41 in an appropriate A direction (for example, the back surface of the plane mirror 41 on the B direction B1 side is the second biasing portion 432. 2 It functions to be positioned at the position where it rides on the inclined surface 4329). In order to enhance such a function, the second guide portion 442 preferably has a corner R (see the tapered portion 4422 due to the curved surface) as shown in FIG. 6 instead of a so-called pin angle at the front corner in the insertion direction. Granted. As a result, when the plane mirror 41 is inserted into the holder 42 at the time of assembly, the back surface of the plane mirror 41 can function to be positioned at an appropriate position in the A direction.

As shown in FIG. 7, the third guide portion 443 is provided on the B2 side in the B direction with respect to the third portion 423. The third guide portion 443 is continuous with respect to the third portion 423 from the B2 side in the B direction. When the plane mirror 41 is inserted into the holder 42 at the time of assembly, the third guide portion 443 positions the side portion of the plane mirror 41 in the C direction at an appropriate position in the C direction (for example, the side surface of the plane mirror 41 on the C direction C1 side is the third portion. It functions to be positioned at a position (position in contact with the surface of 423 on the C2 side in the C direction). In order to enhance such a function, the third guide portion 443 preferably realizes a tapered portion 4432 that inclines toward the C1 side in the C direction as the surface on the C2 side in the C direction toward the B2 side in the B direction. Although FIG. 7 shows the third guide portion 443 on the C1 side in the C direction, a guide portion such as the third guide portion 443 on the C2 side in the C direction (see the third guide portion 443A in FIG. 6). ) May be formed.

In this way, in the present embodiment, the first guide portion 441, the second guide portion 442, and the third guide portion 443 cooperate with each other to form an opening on the entrance side when the plane mirror 41 is inserted. The tapered portions 4211, 4422, and 4432 are provided so that the opening when viewed in the insertion direction becomes wider toward the B2 side in the B direction. As a result, when the plane mirror 41 is inserted into the holder 42 at the time of assembly, the plane mirror 41 can be easily positioned in an appropriate positional relationship with respect to the holder 42, and the assembling property is improved.

In the modified example, a part or all of the first guide portion 441, the second guide portion 442 and the third guide portion 443 may be omitted, and a part or all of the tapered portions 4211, 4422, 4432 may be omitted. May be done.

According to the present embodiment described above, as described above, the first urging portion 431, the second urging portion 432, and the third urging portion 433 are elastically deformed, so that the plane mirror 41 is inserted into the holder 42. Good assembling property. Further, according to the present embodiment, as described above, the holder 42 is elastically deformed so that the displacement of the plane mirror 41 with respect to the holder 42 in the three directions (A direction, B direction, and C direction) is substantially eliminated. Can be restrained. In this way, according to the present embodiment, the plane mirror 41 can be held by the holder 42 substantially without play in a manner in which the assembling property is good.

In the above-described embodiment, the first urging portion 431 comes into contact with the back surface of the plane mirror 41, but the present invention is not limited to this. For example, the first urging portion 431 may apply a force to the plane mirror 41 toward the A2 side in the A direction in contact with the surface of the plane mirror 41 on the reflection surface side. In this case, the first urging portion 431 may be provided, for example, on the side of the first portion 421. In this case, the back surface of the plane mirror 41 comes into contact with the base portion 420, so that the displacement toward the A2 side in the A direction is constrained.

Further, in the above-described embodiment, the third urging portion 433 is provided on the C2 side in the C direction, but may be provided on the C1 side in the C direction. In this case, the third portion 423 is provided on the C2 side in the C direction.

[Construction of plane mirror]
Next, a preferable configuration of the plane mirror 41 will be described with reference to FIGS. 8 and 9.

FIG. 8 is a cross-sectional view showing the plane mirror 41 of the first embodiment. FIG. 9 is an explanatory view of the operation of the plane mirror 41.

As shown in FIG. 8, the plane mirror 41 of the first embodiment includes a reflective layer 411, an adhesive layer 412, and a base material 413 to which the reflective layer 411 is bonded via the adhesive layer 412. The reflective layer 411 faces the TFT panel unit 3 and the concave mirror 5. The adhesive layer 412 and the base material 413 are arranged behind the reflective layer 411.

The reflective layer 411 is a reflective polarizing multilayer film. The reflective polarizing multilayer film is a film in which polyester resin films having different refractive indexes are laminated in several hundred layers.

The refractive index of each film is adjusted so that the reflective layer 411 reflects only a specific polarization component of visible light I. The reflective layer 411 has wavelength selectivity with respect to the reflected wavelength, and allows infrared light J to pass through without being reflected. The reflection layer 411 has a reflection axis and reflects a linearly polarized component of visible light I parallel to the reflection axis direction Rr. The reflection axis direction Rr may be parallel to the above-mentioned C direction. The reflection layer 411 passes the linearly polarized light component of visible light I perpendicular to the reflection axis direction Rr without being reflected. A specific description will be given with reference to FIG. When the reflection axis direction Rr of the reflection layer 411 is parallel to the direction orthogonal to the incident plane D (the plane formed by the incident light E and the reflected light F), the reflection layer 411 has a wave component parallel to the incident plane D. It transmits the P-polarized light G (not shown) of a certain visible light I. Further, the reflection layer 411 reflects the S-polarized light H of visible light I, which is a wave component orthogonal to the incident plane D.

According to the plane mirror 41 provided with such a reflection layer 411, it is possible to transmit the infrared light J among the external light such as sunlight incident from the outside and prevent the light from reaching the TFT panel unit 3. Further, since the reflective layer 411 reflects only S-polarized light H and transmits P-polarized light G among the visible light I contained in the external light, a glass plate with a polarizing film or the like is arranged in the vicinity of the TFT panel unit 3. It is possible to reduce the visible light directed to the TFT panel unit 3 without doing so.

The adhesive layer 412 is a colorless and transparent translucent adhesive layer made of an acrylic resin. The reflective layer 411 and the adhesive layer 412 are supplied as an integral member, and the total thickness thereof is about 60 μm.

The base material 413 is a member that holds the reflective layer 411 well with flatness and flatness, and has vibration resistance and transparency. For example, transparent inorganic glass is used. Considering economy and rigidity as the plane mirror 41 of the head-up display 1, inorganic glass having a thickness of 1.7 to 2.1 mm is applied.

[Arrangement of plane mirrors]
The plane mirror 41 is arranged in a direction in which the reflection axis direction Rr of the reflection layer 411 is substantially parallel to the polarization direction of the display light emitted from the TFT panel unit 3. By arranging the plane mirror 41 in this way, it is possible to reduce the visible light I toward the TFT panel unit 3 while suppressing the attenuation of the display light from the TFT panel unit 3 and reflecting it toward the viewpoint of the occupant.

For example, the head-up display 1 of the present embodiment shown in FIG. 1A is a so-called horizontal folding type in which the plane mirror 41 reflects the display light from the TFT panel unit 3 in the horizontal direction (the direction closer to the horizontal direction than the vertical direction). be. Therefore, in the plane mirror 41, the incident plane D relating to the display light from the TFT panel unit 3 is closer to the horizontal plane than the vertical plane, and the reflection axis direction Rr of the reflection layer 411 is substantially parallel to the direction orthogonal to the incident plane D. It is arranged in the direction that becomes. Specifically, the plane mirror 41 is arranged in a direction in which the reflection axis direction Rr of the reflection layer 411 is in the vertical direction (direction closer to the vertical direction than the horizontal direction).

It is desirable that the incident angle of the display light from the TFT panel unit 3 to the plane mirror 41 is 30 ° to 40 °. In this way, the concave mirror 5 and the TFT panel unit 3 can be arranged at close positions, so that the head-up display 1 can be miniaturized.

[Other examples of plane mirrors]
Next, the plane mirrors 41B, 41C, and 41D of the second to fourth embodiments will be described with reference to FIGS. 10 to 12. However, for the configuration common to that of the first embodiment, the description of the first embodiment is incorporated by using the same reference numerals as those of the first embodiment.

FIG. 10 is a cross-sectional view showing the plane mirror 41B of the second embodiment. FIG. 11 is a cross-sectional view showing the plane mirror 41C of the third embodiment. FIG. 12 is a cross-sectional view showing the plane mirror 41D of the fourth embodiment.

According to the plane mirror 41 of the first embodiment described above, since the P-polarized light G of the infrared light J and the visible light I contained in the external light such as sunlight is prevented from heading toward the TFT panel unit 3, it is shielded from the external light. Increased heat. However, in the plane mirror 41 of the first embodiment, as shown in FIG. 8, a part of the light (infrared light J or P-polarized light G) transmitted through the reflection layer 411 is reflected on the back surface of the base material 413, and the reflection layer. There is a possibility that it will pass through 411 again and head toward the TFT panel unit 3. The temperature rise of the TFT panel unit 3 due to such retransmitted light may reach about 10 ° C. at ^{1,000 W / m 2 of sunlight.} Further, when the light transmitted through the reflective layer 411 irradiates the holding member of the plane mirror 41, the modeling of the holding member may be reflected in the display image.

As shown in FIG. 10, in the plane mirror 41B of the second embodiment, the base material 413B has a light-shielding property. The light-shielding base material 413B is not colorless and transparent but is colored, and is composed of, for example, a black resin plate. According to such a plane mirror 41B, since the light transmitted through the reflection layer 411 is absorbed by the base material 413B, the heat shielding effect of the plane mirror 41B can be enhanced. Further, according to the base material 413B having a light-shielding property, it is possible to prevent the modeling of the holding member of the plane mirror 41B from being reflected in the display image.

As shown in FIG. 11, in the plane mirror 41C of the third embodiment, the adhesive layer 412C has a light-shielding property. The light-shielding adhesive layer 412C is not colorless and transparent but is colored, and is composed of, for example, a black adhesive. According to such a plane mirror 41C, the same effect as that of the plane mirror 41B of the second embodiment can be obtained.

As shown in FIG. 12, the plane mirror 41D of the fourth embodiment includes a light-shielding layer 414 having a light-shielding property on the back surface of the base material 413 (the surface opposite to the reflection layer 411). The light-shielding layer 414 is composed of a print layer printed with colored ink that is not colorless and transparent, a colored adhesive film, and the like. According to such a plane mirror 41D, the same effect as that of the plane mirror 41B of the second embodiment can be obtained. When the light-shielding layer 414 is composed of a print layer, it is preferably composed of a black oil-based ink or a UV-curable ink having a refractive index close to that of the base material 413. When the light-shielding layer 414 is made of an adhesive film, it is preferably made of a black adhesive film that is attached via an adhesive having a refractive index close to that of the base material 413. With this configuration, the reflectance at the interface between the base material 413 and the light-shielding layer 414 is reduced, so that the light transmitted through the reflection layer 411 can be reliably absorbed by the light-shielding layer 414.

By the way, when the plane mirror 41D of the fourth embodiment is used, the light-shielding layer 414 may be pressed by the above-mentioned first urging portion 431 and the second urging portion 432, resulting in peeling or the like.

Therefore, the light-shielding layer 414 is preferably formed with a thickness that does not cause such peeling. For example, when the light-shielding layer 414 is formed by a print layer printed with colored ink, it may be realized by superimposing the print layers obtained by printing two or more times. As a result, even if the light-shielding layer 414 is pressed against the first urging portion 431 or the second urging portion 432 described above, the possibility that the light-shielding layer 414 is peeled off can be reduced.

Further, when the plane mirror 41D of the fourth embodiment is used, the same applies to the cases of the first to third embodiments, but the reflection layer 411 is also reflected when the plane mirror 41D is inserted into the holder 42 at the time of assembly. The layer 411 is formed on each of the corners (the corners of the sides L1 and L3 in FIG. 4, the corners of the sides L1 and L4, the corners of the sides L2 and L3, and the corners of the sides L2 and L4, respectively. It may come off from the corresponding corner).

Therefore, the reflective layer 411 preferably corresponds to the corners of the sides L1 and L3, the corners of the sides L1 and L4, the corners of the sides L2 and L3, and the corners of the sides L2 and L4, respectively. A corner R is given to the corner portion to be used. FIG. 13 shows, as an example, the angle R (see arrow 1300) of the reflective layer 411 at one corner. Thereby, when the plane mirror 41D is inserted into the holder 42 at the time of assembly, even if the reflective layer 411 interferes with the holder 42, the possibility that the reflective layer 411 is peeled off can be reduced. Further, in FIG. 13, the outer peripheral edge of the reflective layer 411 has a clearance Δ1 of about 0.1 to 0.5 mm from the outer peripheral edge (C surface portion end surface) of the base material 413. As a result, the reflective layer 411 is less likely to be peeled off from the outer peripheral edge thereof, and the possibility of the reflective layer 411 being peeled off can be reduced.

By the way, when the plane mirror 41D of the fourth embodiment is used, the same applies to the cases of the first to third embodiments, but the mode in which the plane mirror 41D deviates from the desired direction with respect to the holder 42 in the reflection axis direction Rr. If it rattles, the quality of the display image generated by the head-up display 1 tends to deteriorate. In this respect, since the holder 42 can hold the plane mirror 41D without rattling as described above, the possibility of such deterioration of quality can be effectively reduced.

Although each embodiment has been described in detail above, it is not limited to a specific embodiment, and various modifications and changes can be made within the scope of the claims. It is also possible to combine all or a plurality of the components of the above-described embodiment.

1 Head-up display 2 Case 3 TFT panel unit 4 Reflector unit 5 Concave mirror 6 Backlight unit 7 Heat dissipation member 71 Fin 9 Instrument panel 41 Plane mirror 41B Plane mirror 41C Plane mirror 41D Plane mirror 42 Holder 411 Reflection layer 412 Adhesive layer 412C Adhesive layer 413 units Material 413B Base material 414 Light-shielding layer 418 Side part 420 Base part 421 1st part 422 2nd part 423 3rd part 431 1st urging part 432 2nd urging part 433 3rd urging part 441 1st guide part 442 2 Guide 443 3rd Guide 443A 3rd Guide 4200 Flat 4201 Rib 4202 Frame 4205 Window 4211 Tapered 4221 Opening 4320 Edge 4322 Return 4328 2nd Plane 4329 2nd Inclined Surface 4421 Edge 4422 Tapered Part 4432 Tapered part 43221 First inclined surface 43222 First plane 43281 Curved surface 44211 Curved surface

Claims (12)

Housing (2) and
Lighting device (6) and
A display (3) that emits display light illuminated by the lighting device, and
A plane mirror (41) that reflects the display light and
A holder (42) for holding the plane mirror is provided.
When the direction perpendicular to the reflection surface of the plane mirror is the first direction (A), the holder is elastically deformed in contact with the plane mirror, so that the displacement of the plane mirror in the first direction with respect to the holder. And the head-up display (1) that constrains the displacement of the plane mirror with respect to the holder about the axis parallel to the first direction. One direction orthogonal to the first direction, the direction in which the plane mirror is inserted into the holder at the time of assembly is the second direction (B), and the direction is orthogonal to both the first direction and the second direction. In the third direction (C), the holder constrains the displacement of the plane mirror in the second direction with respect to the holder and the displacement of the plane mirror in the third direction with respect to the holder, according to claim 1. The described head-up display. The holder
A planar base portion (420) on which the planar mirrors overlap when viewed in the first direction, and
A first portion (421) that is separated from the base portion in the first direction by a distance slightly larger than the thickness of the plane mirror.
A second portion (422) that is erected in the first direction at a position on the back side of the base portion in the insertion direction and abuts on the back side surface of the plane mirror in the insertion direction in the second direction. When,
It is erected in the first direction at the position of the first side (C1) in the third direction in the base portion, and is in the third direction with respect to the side surface of the first side in the third direction in the plane mirror. The third part (423) that comes into contact with
A first urging portion (431) that applies a force in the first direction to the plane mirror by abutting against the plane mirror and elastically deforming the plane mirror.
A second urging portion (432) that abuts on the front side portion of the plane mirror in the insertion direction and elastically deforms to apply a force in the second direction to the plane mirror.
A third urging portion that abuts on the side surface of the second side (C2) opposite to the first side in the third direction of the plane mirror and elastically deforms the plane mirror to apply a force in the third direction to the plane mirror. (433), the head-up display according to claim 2. The first portion abuts in the first direction with respect to the side portion of the plane mirror in the third direction.
The head-up display according to claim 3, wherein the first urging portion is arranged in a region where the plane mirrors overlap when viewed in the first direction, and abuts on the back surface of the plane mirrors. The head-up display according to claim 3 or 4, wherein the third urging portion abuts only on the inner side in the insertion direction of the side surface of the plane mirror on the second side in the third direction. Any one of claims 3 to 5, wherein the second urging portion has a claw-shaped shape and has a return portion (4322) that engages with a side portion on the front side in the insertion direction of the plane mirror. Heads-up display as described in the section. The second urging portion includes a first plane (43222) perpendicular to the back surface of the plane mirror, and the second urging portion continuous from the back side in the insertion direction with respect to the first plane and toward the back side in the insertion direction. A first inclined surface (43221) in an inclined direction approaching the base portion in the first direction is provided on the side facing the plane mirror in the first direction.
The head-up display according to claim 6, wherein the return portion is formed by the first flat surface and the first inclined surface. The second urging portion has a second plane (4328) connected to the first plane from the front side in the insertion direction and parallel to the back surface of the plane mirror, and the insertion direction with respect to the second plane. Further has a second inclined surface (4329) which is connected from the front side of the above and has an inclined direction opposite to that of the first inclined surface.
The head-up display according to claim 7, wherein the second inclined surface and the second plane are continuous via a curved surface (44211). The method according to any one of claims 3 to 8, wherein the base portion has a window portion (4205) penetrating in the first direction within a range in which the plane mirrors overlap when viewed in the first direction. Head-up display. The holder has a first guide portion (441) on the front side in the insertion direction with respect to the first portion, and a second guide portion (442) on the front side in the insertion direction with respect to the base portion. A third guide portion (443) is further provided on the front side in the insertion direction with respect to the third portion.
The first guide portion, the second guide portion, and the third guide portion form an opening on the entrance side when the plane mirror is inserted.
At least one of the first guide portion, the second guide portion, and the third guide portion is such that the opening when viewed in the insertion direction becomes wider toward the front side in the insertion direction. The head-up display according to any one of claims 3 to 9, further comprising a tapered portion (4211, 4422, 4432). The head-up display according to any one of claims 3 to 10, wherein the base portion has a reinforcing rib (4201) on the side facing the plane mirror in the first direction. The first side surface of the plane mirror in the third direction forms a right angle to the back side surface of the plane mirror in the insertion direction.
Any of claims 3 to 11, wherein the second side surface of the plane mirror in the third direction forms an angle greater than 90 degrees with respect to the back side surface of the plane mirror in the insertion direction. The head-up display according to item 1.

Images