Head-up display and method of manufacturing the same

Abstract

The present invention causes a holder to hold a plane mirror without causing damage to a reflection layer. Provided is a head-up display (1) comprising a housing (2), a display device (3+6) that emits display light, a plane mirror (41) that reflects the display light, and a holder (42) that holds the plane mirror, wherein the plane mirror has a base material, and a reflection layer provided on the base material and including a resin film, and the holder abuts on a portion of the base material in which the reflection layer is not provided.

Description

[Technical Field]

[0001] The present disclosure relates to a head-up display and a method for manufacturing a head-up display. [Background technology]

[0002] A head-up display is disclosed in which a plane mirror is provided in front of a liquid crystal display. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-174855 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-described conventional techniques, when the plane mirror includes a reflective layer that includes a resin film, it is difficult to hold the plane mirror on the holder without damaging the reflective layer.

[0005] Therefore, an object of the present disclosure is to allow a holder to hold a plane mirror without damaging the reflective layer. [Means for solving the problem]

[0006] In one aspect, a housing (2) and a display device (3+6) that emits display light; a plane mirror (41) that reflects the display light; a holder (42) for holding the plane mirror; the plane mirror has a substrate and a reflective layer provided on the substrate and including a resin film; A head-up display (1) is disclosed, in which the holder abuts against a portion of the base material where the reflective layer is not provided. [Effects of the Invention]

[0007] According to the present disclosure, a holder can hold a plane mirror without damaging the reflective layer. [Brief explanation of the drawings]

[0008] [Figure 1A] 1 is a perspective view showing an internal configuration of a head-up display according to an embodiment from above; [Figure 1B] FIG. 2 is a perspective view showing a head-up display from below. [Figure 1C] FIG. 2 is a perspective view showing a TFT panel unit. [Figure 1D] FIG. 2 is a perspective view showing a backlight unit and a heat dissipation member. [Figure 2] 1 is a diagram schematically illustrating a state in which a head-up display is mounted on a vehicle, as viewed from the side of the vehicle. [Figure 3] FIG. 2 is a perspective view of a reflecting mirror unit in a single state. [Figure 4] FIG. 2 is an exploded perspective view of a reflecting mirror unit. [Figure 5] FIG. 10 is a perspective view of the holder in a single state as viewed from the front side in the insertion direction. [Figure 6] FIG. 10 is an explanatory diagram of the shape of a second biasing portion. [Figure 7] FIG. 5 is an enlarged perspective view of a portion Q1 of FIG. 4, seen from a different direction. [Figure 8] FIG. 2 is a cross-sectional view showing the plane mirror of the first embodiment. [Figure 9] FIG. 2 is a diagram illustrating the operation of a plane mirror. [Figure 10] FIG. 10 is a cross-sectional view showing a plane mirror of a second embodiment. [Figure 11] FIG. 10 is a cross-sectional view showing a plane mirror of a third embodiment. [Figure 12] FIG. 10 is a cross-sectional view showing a plane mirror of a fourth embodiment. [Figure 13] 5 is an enlarged view of the Q2 portion of FIG. 4 illustrating the corner R of the reflective layer. [Figure 14] FIG. 2 is an explanatory diagram of a resin film formed by rolling. [Figure 15] FIG. 2 is a plan view showing the relationship between a reflective layer and a substrate. [Figure 16] FIG. 2 is a perspective view showing the relationship between a reflective layer and a substrate. [Figure 17] FIG. 10 is a plan view showing an example of a mold that can be used to punch out the reflective layer. [Figure 18] FIG. 18 is a schematic cross-sectional view taken along line DD in FIG. 17. [Figure 19] FIG. 18 is a schematic enlarged view of part Q3 in FIG. 17. [Figure 20] FIG. 10 is a perspective view showing another example of a reflecting mirror unit. [Figure 21] FIG. 10 is an exploded perspective view showing another example of a reflecting mirror unit. [Figure 22] FIG. 10 is a perspective view of a main part of a reflecting mirror unit according to another example. [Figure 23] FIG. 10 is a cross-sectional view of a main part of another example of a reflecting mirror unit. DETAILED DESCRIPTION OF THE INVENTION

[0009] Each embodiment will be described in detail below with reference to the accompanying drawings. Note that in Figure 1A and other figures, for ease of viewing, only some of the reference symbols may be assigned to multiple parts or portions with the same attribute.

[0010] [Head-up display configuration] FIG. 1A is a perspective view showing the internal configuration of a head-up display 1 according to an embodiment, from above. FIG. 1B is a perspective view showing the head-up display 1 from below. FIG. 1C is a perspective view showing a TFT panel unit 3. FIG. 1D is a perspective view showing a backlight unit 6 and a heat dissipation member 7. FIG. 2 is a diagram schematically showing a state in which the head-up display 1 is mounted on a vehicle, as seen from the side of the vehicle. Note that some components of the head-up display 1 are not shown in FIGS. 1A and 1B. In FIG. 1A and other figures, three mutually orthogonal directions, that is, an X direction, a Y direction, and a Z direction, are defined in a right-handed system. Hereinafter, for the sake of formality, the Z direction will be referred to as the up-down direction, with the positive side being the upper side and the negative side being the lower side.

[0011] The head-up display 1 is mounted in an instrument panel 9 of a vehicle. The head-up display 1 may be mounted in an orientation in which the Y direction in FIG. 1A substantially corresponds to the vehicle width direction.

[0012] The head-up display 1 includes a case 2, a TFT (Thin Film Transistor) panel unit 3, a reflecting mirror unit 4, a concave mirror 5, a backlight unit 6, and a heat dissipation member .

[0013] 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 that is not shown in FIG. 1A.

[0014] The case 2 is made of, for example, resin. The case 2 may be made of two or more members.

[0015] The TFT panel unit 3 is fixed to the case 2. The TFT panel unit 3 is a display device that uses light from the backlight unit 6 as a backlight and emits display light corresponding to a display image. The TFT panel unit 3 of this embodiment includes a dot matrix TFT (Thin Film Transistor) panel. The display image is arbitrary and may be, for example, an image showing navigation information, various types of vehicle information, etc.

[0016] The reflecting mirror unit 4 is fixed to the case 2. The reflecting mirror unit 4 includes a plane mirror 41 and a holder 42 that holds the plane mirror 41, and reflects the display light emitted from the TFT panel unit 3 toward the concave mirror 5.

[0017] The concave mirror 5 is fixed to the case 2. The concave mirror 5 is rotatably supported relative to the case 2 so that the vertical position of the area on the windshield WS onto which the display light falls can be adjusted. The concave mirror 5 reflects the display light reflected by the reflecting mirror unit 4, and emits the light from an exit port provided in the upper case (not shown) toward the windshield WS of the vehicle VC.

[0018] 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 LEDs (Light Emitting Diodes) 62 are mounted. The substrate 60 may be placed on a heat dissipation member 7 as shown in FIG. 1D. The backlight unit 6 cooperates with the TFT panel unit 3 to generate display light.

[0019] The heat dissipation member 7 is made of a highly heat-conductive material such as aluminum. The heat dissipation member 7 is attached to the case 2 in a manner that the fins 71 are exposed to the outside of the case 2. The heat dissipation member 7 has a function of dissipating heat generated from the backlight unit 6. The heat dissipation member 7 releases the heat into the air flowing outside the case 2.

[0020] In such a head-up display 1, when display light is irradiated onto the windshield WS, a driver of the vehicle VC can see a display image (virtual image display) VI obtained by the irradiation in front of the windshield WS, as shown in Fig. 2. This allows the driver to visually recognize the display image VI superimposed on the scenery ahead, and to grasp vehicle information, etc. with minimal eye movement, thereby improving convenience and safety.

[0021] [Reflector unit configuration] Fig. 3 is a perspective view of the reflecting mirror unit 4 in a standalone state, and Fig. 4 is an exploded perspective view of the reflecting mirror unit 4. Fig. 5 is a perspective view of the holder 42 in a standalone state, 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 biasing portion 432. Fig. 7 is an explanatory diagram of the entrance opening, and is an enlarged perspective view of portion Q1 in Fig. 4, from a different direction.

[0022] In addition to the X, Y, and Z directions described above, Fig. 4 also defines A, B, and C directions. The A direction is perpendicular to the reflective surface of the plane mirror 41, and the terms "A1 side" and "A2 side" represent relative positional relationships based on a certain component. The A1 side relatively represents the side from the center of the plane mirror 41 in the A direction toward the reflective surface of the plane mirror 41, and the A2 side relatively represents the side from the center of the plane mirror 41 in the A direction toward the rear surface of the plane mirror 41. The B direction (an example of a second direction) is a direction perpendicular to the A direction and corresponds to the insertion direction of the plane mirror 41 into the holder 42 during assembly. The B1 side relatively represents the rear 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 first direction) is a direction perpendicular to both the A direction and the B direction, and the C1 side relatively represents the side from the center position of the plane mirror 41 in the C direction toward side L4, and the C2 side relatively represents the side from the center position of the plane mirror 41 in the C direction toward side L3.

[0023] The reflecting mirror unit 4 includes a plane mirror 41 and a holder 42 .

[0024] As described above, the plane mirror 41 forms a reflective 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 uniform thickness and a rectangular outer shape. In this embodiment, as an example, the plane mirror 41 is trapezoidal with parallel sides L1 and L2, the angle between sides L1 and L4 is 90 degrees, and the angle between sides L1 and L3 is greater than 90 degrees. That is, the angle between the side face on the side L1 side and the side face on the side L4 side of the plane mirror 41 is 90 degrees, and the angle between the side face on the side L1 side and the side face on the side L3 side is greater than 90 degrees. The side face on the side L1 side and the side face on the side L4 side may be connected by a so-called pin angle or a curved surface (R surface). The same applies to the side face on the side L1 side and the side face on the side L3 side.

[0025] The holder 42 is made 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.

[0026] In this embodiment, the holder 42 elastically deforms upon contact with the plane mirror 41, thereby having the function of restricting the displacement of the plane mirror 41 in the A direction relative to the holder 42 and the displacement of the plane mirror 41 around an axis parallel to the A direction (for example, an axis parallel to the A direction passing through the centroid).

[0027] 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, a third urging portion 433, a first guide portion 441, a second guide portion 442, and a third guide portion 443.

[0028] The base portion 420 extends within the area overlapping with the plane mirror 41 when viewed in the direction A. The base portion 420 has a planar shape.

[0029] 4, the base portion 420 preferably has ribs 4201 arranged in a honeycomb pattern on the side (A1 side) facing the plane mirror 41 in the A direction. The ribs 4201 are erected on the flat surface portion 4200. This makes it possible to increase the rigidity of the base portion 420 and therefore the holder 42 while reducing the thickness of the flat surface portion 4200 of the base portion 420 (and thus reducing the mass of the base portion 420). Note that the ribs 4201 may be formed in other patterns (patterns other than honeycomb) as long as they function to increase rigidity.

[0030] The base portion 420 further has a frame portion 4202 whose height (height in direction A) from the flat portion 4200 is slightly greater than that of the rib 4201. The frame portion 4202 extends near each of a first urging portion 431, a second urging portion 432, and a third urging portion 433, which will be described later, and has the function of ensuring necessary rigidity.

[0031] The base portion 420 has a window portion 4205 penetrating in the A direction within the range where the plane mirror 41 overlaps when viewed in the A direction. The window portion 4205 is provided so that it is possible to confirm that the plane mirror 41 has been inserted into the holder 42 in the desired manner. Therefore, the window portion 4205 is preferably provided on the far side in the insertion direction. In this case, it is possible to confirm that the plane mirror 41 has been inserted into the holder 42 in the desired manner by checking that the plane mirror 41 is visible through the window portion 4205. In this embodiment, as an example, three windows 4205 are provided lined up in the C direction.

[0032] The first portion 421 is spaced from the base portion 420 on 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 with the base portion 420 when viewed in the A direction. In this embodiment, the first portion 421 is provided so as to face in the A direction portions of the base portion 420 on both sides in the C direction and a portion of the base portion 420 on the B1 side in the B direction.

[0033] The first portion 421 abuts against the surface of the plane mirror 41 on the reflective surface side in the A direction at an edge portion of three sides (side L1, side L3, and side L4) of the plane mirror 41. The first portion 421 has a function of constraining displacement of the plane mirror 41 in the A direction relative to the holder 42 in cooperation with a first biasing portion 431 described later. That is, the first portion 421 abuts against the surface of the plane mirror 41 on the reflective surface side from the A direction A1 side, thereby restricting displacement of the plane mirror 41 toward the A direction A1 side. Hereinafter, this function of constraining displacement in the A direction will also be referred to as an "A direction displacement constraining function."

[0034] In this embodiment, as described above, the first portion 421 extends in a C-shape when viewed in the A direction, and can therefore abut against the plane mirror 41 along three sides (sides L1, L3, and L4) of the plane mirror 41. This effectively enhances the A-direction displacement constraint function described above. However, in modified examples, the first portion 421 may be provided in other ways. For example, the first portion 421 may be provided only on both sides of the base portion 420 in the C direction so as to face each other in the A direction.

[0035] 5, the second portion 422 is erected on the A1 side in the A direction at a position (boundary position) on the far side in the insertion direction (B1 side in the B direction) of the base portion 420. 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 therebetween.

[0036] The second portion 422 abuts against the side surface of the plane mirror 41 on the far side in the insertion direction (i.e., the side L1 side) in the direction B. The second portion 422 has the function of constraining displacement of the plane mirror 41 in the direction B relative to the holder 42 in cooperation with a second biasing portion 432 described later. That is, the second portion 422 restricts displacement of the plane mirror 41 toward the B1 side in the direction B by abutting against the side surface of the plane mirror 41 on the B1 side in the direction B from the B1 side. Hereinafter, this function of constraining displacement in the direction B will also be referred to as the "B-direction displacement constraining function."

[0037] In this embodiment, as described above, the second portions 422 are disposed along the C direction in a manner that they face the entire side surface on the B1 side of the plane mirror 41 in the B direction, although they have the opening 4221 therebetween, and therefore the B-direction displacement restraint function described above can be effectively enhanced. However, in modified examples, the second portions 422 may be provided in other ways.

[0038] 5, the third portion 423 is erected on the A1 side in the A direction at a position (boundary position) on the C1 side in the C direction on the base portion 420. In this embodiment, the third portion 423 is formed so as to be continuous with the first portion 421 on the C1 side in the C direction (so as to form an L-shaped cross section when viewed in the B direction), and extends in the B direction over the same range as the first portion 421 on the C1 side in the C direction.

[0039] The third portion 423 abuts against the side surface of the plane mirror 41 on the C1 side in the C direction in the C direction. The third portion 423 has a function of constraining displacement of the plane mirror 41 in the C direction relative to the holder 42 in cooperation with a third biasing portion 433 described later. That is, the third biasing portion 433 abuts against the side surface of the plane mirror 41 on the C1 side in the C direction from the C1 side in the C direction, thereby restricting displacement of the plane mirror 41 toward the C1 side in the C direction. Hereinafter, this function of constraining displacement in the C direction will also be referred to as a "C-direction displacement constraining function."

[0040] In this embodiment, the third portion 423 is disposed along the direction B in a manner that faces substantially the entire side surface of the plane mirror 41 on the C1 side in the direction C, thereby effectively enhancing the above-described function of restricting displacement in the direction C. However, in modified examples, the third portion 423 may be provided in other ways.

[0041] The first urging portions 431 are provided within a range overlapping with the plane mirror 41 when viewed in the direction A. In the present embodiment, as an example, as shown in FIG. 4, two first urging portions 431 are provided on each side of the range overlapping with the plane mirror 41 in the direction C when viewed in the direction A.

[0042] The first biasing portion 431 contacts the rear surface of the plane mirror 41 and applies a force in the A direction to the plane mirror 41 by elastically deforming mainly toward the A2 direction. Specifically, the first biasing portion 431 is claw-shaped, and before the plane mirror 41 is attached to the holder 42, its tip is located closer to the A1 direction than the base portion 420. When the plane mirror 41 is attached to the holder 42, the tip of the first biasing portion 431 is displaced toward the A2 direction, and the first biasing portion 431 is elastically deformed. As a result, the first biasing portion 431 can apply a force to the plane mirror 41 toward the A1 direction. As described above, the displacement of the plane mirror 41 toward the A1 direction is restricted by the first portion 421. In this way, the first biasing portion 431 cooperates with the first portion 421 to achieve the A-direction displacement constraint function described above.

[0043] In this embodiment, as described above, the first biasing 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 of the B direction. This effectively enhances the A-direction displacement restraint function described above on both sides of the C direction and both sides of the B direction. However, in modified examples, the first biasing portions 431 may be provided in other ways. For example, the first biasing portions 431 may be additionally provided near the first portion 421 on the B1 side in the B direction.

[0044] When viewed in the direction A, the second urging portion 432 is provided on the B2 side in the direction B in an area overlapping with the plane mirror 41. In this embodiment, as an example, three second urging portions 432 are provided lined up in the direction C as shown in FIG.

[0045] The second biasing portion 432 abuts against the side portion 418 of the plane mirror 41 on the front side in the insertion direction (the B2 side in the B direction) and applies a force in the B direction to the plane mirror 41 by elastically deforming. Specifically, as shown in FIG. 6 , the second biasing portion 432 is claw-shaped and has a return portion 4322 that engages with the side portion 418 of the plane mirror 41 on the front side in the insertion direction. When the plane mirror 41 is assembled to the holder 42, the second biasing portion 432 is displaced toward the A2 side in the A direction, and the second biasing portion 432 is elastically deformed. The return portion 4322 abuts against the side portion 418 of the plane mirror 41 on the B2 side in the B direction (more precisely, the corner of the side portion 418 on the A2 side in the A direction) while the second biasing portion 432 is elastically deformed mainly toward the A2 side. This allows the second biasing portion 432 to 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 restricted by the second part 422. In this way, the second biasing part 432 cooperates with the second part 422 to realize the above-described B direction displacement restriction function.

[0046] In this embodiment, as described above, three second urging portions 432 are provided at approximately equal intervals in the C direction. This effectively enhances the B direction displacement restraint function described above. However, in modified examples, the second urging portions 432 may be provided in other ways. For example, the middle one of the three second urging portions 432 may be omitted. Note that in this embodiment, the three second urging portions 432 are substantially the same in shape, but may differ in details.

[0047] Incidentally, in order to realize the above-described B-direction displacement restraint function, the second urging portion 432 needs to be located on the B2 side in the B direction relative to the plane mirror 41, unlike the first urging portion 431 and the third urging portion 433. This means that when the plane mirror 41 is inserted into the holder 42 during 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 ease of assembly when inserting the plane mirror 41 into the holder 42 during assembly than the first urging portion 431 and the third urging portion 433.

[0048] In this regard, in this embodiment, as described below, the second biasing portion 432 is configured to enhance the above-mentioned B-direction displacement restraint function while improving assembly ease when inserting the plane mirror 41 into the holder 42.

[0049] 6, an edge 4320 on the front side in the insertion direction of the second urging portion 432 is spaced further away in the A direction from the rear surface of the plane mirror 41 than an edge 4421 on the front side in the insertion direction of the second guide portion 442. In other words, the edge 4320 of the second urging portion 432 is located closer to the A2 side in the A direction than the edge 4421 of the second guide portion 442. This reduces the possibility that the plane mirror 41 will interfere with the second urging portion 432 before the second guide portion 442 when inserting the plane mirror 41 into the holder 42 during assembly, improving the ease of assembly.

[0050] The second biasing portion 432 also has a first inclined surface 43221, a first flat surface 43222, a second flat surface 4328, and a second inclined surface 4329 on the A-direction A1 side.

[0051] When viewed in the C direction, the first inclined surface 43221 is inclined in a direction that inclines from the edge 4320 toward the B1 side in the B direction toward the A2 side in the A direction.

[0052] The first flat surface 43222 is perpendicular to the rear surface of the plane mirror 41. The first flat surface 43222 is continuous with the first inclined surface 43221 from the B2 side in the B direction. The first flat surface 43222 cooperates with the first inclined surface 43221 to form the above-mentioned turned portion 4322. In this case, the side portion 418 on the B2 side of the plane mirror 41 in the B direction (more precisely, the corner portion of the side portion 418 on the A2 side in the A direction) abuts against the first inclined surface 43221.

[0053] In this embodiment, the first flat surface 43222 is perpendicular to the rear surface of the plane mirror 41, so even if the plane mirror 41 abutting against the first inclined surface 43221 attempts to displace in the B direction B2, the first flat surface 43222 can easily lock the plane mirror 41. This effectively enhances the B-direction displacement restraint function described above.

[0054] The second plane 4328 connects to the first plane 43222 from the B2 side in the B direction. The second plane 4328 is parallel to the rear 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 with 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 constraint function can be ensured.

[0055] The second inclined surface 4329 connects to the second flat surface 4328 from the B2 side in the B direction. The second inclined surface 4329 has an inclination direction opposite to that of the first inclined surface 43221. That is, when viewed in the C direction, the second inclined surface 4329 is inclined toward the A1 side in the A direction as it moves from the edge 4320 toward the B1 side in the B direction. Note that the second inclined surface 4329 may have a smaller inclination than the first inclined surface 43221. This makes it less likely that the plane mirror 41 will get caught on the second inclined surface 4329 when inserting the plane mirror 41 into the holder 42 during assembly, improving assembly ease.

[0056] The second inclined surface 4329 may be connected to the second flat surface 4328 via a curved surface 44211 with 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, the plane mirror 41 is less likely to get caught at the joint between the second inclined surface 4329 and the second flat surface 4328 when inserting the plane mirror 41 into the holder 42 during assembly, improving assembly ease.

[0057] As shown in FIGS. 3 and 4 , the third biasing portion 433 is provided on the C2 side of the base portion 420 in the direction C and the B1 side in the direction B. The third biasing portion 433 abuts against the side surface of the plane mirror 41 on the C2 side in the direction C and applies a force in the direction C to the plane mirror 41 by elastically deforming mainly toward the C2 side in the direction C. Specifically, the third biasing portion 433 is claw-shaped, and its tip protrudes toward the C1 side in the direction C. When the plane mirror 41 is attached to the holder 42, the tip of the third biasing portion 433 is displaced toward the C2 side in the direction C, and the third biasing portion 433 is elastically deformed. As a result, the third biasing portion 433 can apply a force to the plane mirror 41 toward the C1 side in the direction C. As described above, the displacement of the plane mirror 41 toward the C1 side in the direction C is restricted by the third portion 423. In this way, the third biasing portion 433 cooperates with the third part 423 to achieve the above-mentioned C-direction displacement restraint function.

[0058] In this embodiment, only one third biasing portion 433 is provided, but two or more third biasing portions may be provided.

[0059] 3 and 4, the third urging portion 433 preferably abuts only against the rear side in the insertion direction (the B1 side in the B direction) of the side surface of the plane mirror 41 on the C2 side in the C direction. As a result, when the plane mirror 41 is inserted into the holder 42 during 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), which improves assembly ease compared to when the plane mirror 41 interferes with the third urging portion 433 at the start of insertion.

[0060] As shown in FIG. 7, the first guide portion 441 is provided on the B2 side of the first portion 421 in the direction B. The first guide portion 441 is continuous with the B2 side of the first portion 421 in the direction B. When the plane mirror 41 is inserted into the holder 42 during assembly, the first guide portion 441 functions to position both side portions of the plane mirror 41 in the direction C at appropriate positions in the direction A (for example, a position where the surface on the A1 side in the direction A contacts the surface of the first portion 421 on the A2 side in the direction A). To enhance this function, the first guide portion 441 preferably has a tapered portion 4211 such that the height in the direction A (a width slightly larger than the thickness of the plane mirror 41) of the space formed between the first portion 421 and the base portion 420 in the direction A increases toward the B2 side in the direction B. Note that while FIG. 7 shows the first guide portion 441 on the C1 side in the direction C, the same applies to the first guide portion 441 on the C2 side in the direction C. However, in a 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.

[0061] As shown in FIG. 6, the second guide portion 442 is provided on the B2 side of the base portion 420 in the direction B. The second guide portion 442 is continuous with the B2 side of the base portion 420 in the direction B. When inserting the plane mirror 41 into the holder 42 during assembly, the second guide portion 442 functions to position the back surface of the plane mirror 41 at an appropriate position in the direction A (for example, a position where the B1 side of the back surface of the plane mirror 41 in the direction B rides on the second inclined surface 4329 of the second biasing portion 432). To enhance this function, the second guide portion 442 preferably has a corner on the front side in the insertion direction that is not a so-called pin angle, but has an R angle (see the tapered portion 4422 formed by a curved surface) as shown in FIG. 6. This allows the second guide portion 442 to function to position the back surface of the plane mirror 41 at an appropriate position in the direction A when inserting the plane mirror 41 into the holder 42 during assembly.

[0062] As shown in FIG. 7, the third guide portion 443 is provided on the B2 side of the third portion 423 in the direction B. The third guide portion 443 is continuous with the B2 side of the third portion 423 in the direction B. When inserting the plane mirror 41 into the holder 42 during assembly, the third guide portion 443 functions to position the C-direction side of the plane mirror 41 at an appropriate C-direction position (for example, a position where the side surface of the plane mirror 41 on the C1 side in the direction C of the plane mirror 41 contacts the surface of the third portion 423 on the C2 side in the direction C). To enhance this function, the third guide portion 443 preferably has a tapered portion 4432 in which the surface on the C2 side in the direction C of the plane mirror 41 slopes toward the C1 side in the direction C as it approaches the B2 side in the direction B. Note that while FIG. 7 shows the third guide portion 443 on the C1 side in the direction C of the plane mirror 41, a guide portion like the third guide portion 443 (see the third guide portion 443A in FIG. 6) may be formed on the C2 side in the direction C of the plane mirror 41.

[0063] In this way, in this embodiment, the first guide portion 441, the second guide portion 442, and the third guide portion 443 cooperate with one another to form an opening on the entrance side when inserting the plane mirror 41, and have tapered portions 4211, 4422, and 4432 such that the opening when viewed in the insertion direction becomes wider toward the B2 side in direction B. This makes it possible to easily position the plane mirror 41 in an appropriate positional relationship with respect to the holder 42 when inserting the plane mirror 41 into the holder 42 during assembly, improving ease of assembly.

[0064] In a modified example, the first guide portion 441, the second guide portion 442, and the third guide portion 443 may be omitted in part or in whole, and the tapered portions 4211, 4422, and 4432 may be omitted in part or in whole.

[0065] According to the present embodiment described above, the first urging portion 431, the second urging portion 432, and the third urging portion 433 are elastically deformed as described above, which improves assembly performance when inserting the plane mirror 41 into the holder 42. Furthermore, according to the present embodiment, as described above, the elastic deformation of the holder 42 makes it possible to restrain the displacement of the plane mirror 41 in three directions (direction A, direction B, and direction C) relative to the holder 42 with substantially no play. In this way, according to the present embodiment, the plane mirror 41 can be held in the holder 42 with substantially no play in a manner that improves assembly performance.

[0066] In the above-described embodiment, the first biasing portion 431 abuts against the back surface of the plane mirror 41, but this is not limited to this. For example, the first biasing portion 431 may abut against the surface of the plane mirror 41 on the reflective surface side and apply a force to the plane mirror 41 toward the A direction A2. In this case, the first biasing portion 431 may be provided, for example, on the first portion 421 side. In this case, the back surface of the plane mirror 41 abuts against the base portion 420, thereby restricting displacement in the A direction A2.

[0067] In the above-described embodiment, the third biasing portion 433 is provided on the C2 side in the direction C, but may be provided on the C1 side in the direction C. In this case, the third part 423 is provided on the C2 side in the direction C.

[0068] [Plane mirror configuration] Next, a preferred configuration of the plane mirror 41 will be described with reference to FIGS.

[0069] Fig. 8 is a cross-sectional view showing the plane mirror 41 of the first embodiment, and Fig. 9 is an explanatory diagram of the operation of the plane mirror 41.

[0070] 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 disposed behind the reflective layer 411.

[0071] The reflective layer 411 is a reflective polarizing multilayer film, which is a film in which several hundred layers of polyester resin films with different refractive indices are laminated.

[0072] The refractive index of each film in the reflective layer 411 is adjusted so as to reflect only specific polarization components of visible light I. The reflective layer 411 has wavelength selectivity for reflected wavelengths and passes infrared light J without reflecting it. The reflective layer 411 has a reflection axis and reflects linearly polarized components of visible light I parallel to the reflection axis direction Rr. Note that the reflection axis direction Rr may be parallel to the above-mentioned direction C. The reflective layer 411 passes linearly polarized components of visible light I perpendicular to the reflection axis direction Rr without reflecting them. This will be described in detail with reference to FIG. 9. When the reflection axis direction Rr of the reflective layer 411 is parallel to a direction orthogonal to the plane of incidence D (the plane formed by the incident light E and the reflected light F), the reflective layer 411 transmits P-polarized light G (not shown) of visible light I, which is a wave component parallel to the plane of incidence D. The reflective layer 411 also reflects S-polarized light H of visible light I, which is a wave component orthogonal to the plane of incidence D.

[0073] The plane mirror 41 having such a reflective layer 411 can transmit infrared light J from among external light such as sunlight incident from the outside, thereby preventing it from reaching the TFT panel unit 3. Furthermore, the reflective layer 411 reflects only S-polarized light H from visible light I contained in the external light and transmits P-polarized light G, so that it is possible to reduce the visible light heading toward the TFT panel unit 3 without placing a glass plate with a polarizing film or the like near the TFT panel unit 3.

[0074] The adhesive layer 412 is made of an acrylic resin, and is a colorless, transparent, light-transmitting adhesive layer. The reflective layer 411 and the adhesive layer 412 are supplied as an integrated member, and the total thickness thereof is about 60 μm.

[0075] The base material 413 is a member that maintains the reflective layer 411 in a good flatness and planarity, and that is vibration-resistant and transparent, and is made of, for example, transparent inorganic glass. In consideration of economy and rigidity as the flat mirror 41 of the head-up display 1, inorganic glass having a thickness of 1.7 to 2.1 mm is used.

[0076] [Plane mirror placement] The plane mirror 41 is disposed so that the reflective axis direction Rr of the reflective layer 411 is approximately parallel to the polarization direction of the display light emitted from the TFT panel unit 3. By disposing the plane mirror 41 in this manner, it is possible to reduce the visible light I directed toward the TFT panel unit 3, while suppressing attenuation of the display light from the TFT panel unit 3 and reflecting it toward the driver's viewpoint.

[0077] 1A is a so-called horizontally-reflecting type head-up display in which the plane mirror 41 reflects the display light from the TFT panel unit 3 in the horizontal direction (a direction closer to the horizontal direction than the vertical direction). Therefore, the plane mirror 41 is disposed so that the incident plane D of the display light from the TFT panel unit 3 is closer to the horizontal plane than to the vertical plane, and the reflective axis direction Rr of the reflective layer 411 is approximately parallel to the direction perpendicular to the incident plane D. Specifically, the plane mirror 41 is disposed so that the reflective axis direction Rr of the reflective layer 411 is oriented in the vertical direction (a direction closer to the vertical direction than the horizontal direction).

[0078] The angle of incidence of the display light from the TFT panel unit 3 to the plane mirror 41 is preferably 30° to 40°. In this way, the concave mirror 5 and the TFT panel unit 3 can be disposed close to each other, thereby making it possible to reduce the size of the head-up display 1.

[0079] [Another example of a plane mirror] Next, plane mirrors 41B, 41C, and 41D of second to fourth embodiments will be described with reference to Figures 10 to 12. However, for configurations common to the first embodiment, the same reference numerals as in the first embodiment are used, and the description of the first embodiment will be used.

[0080] Fig. 10 is a cross-sectional view showing a plane mirror 41B of a second embodiment, Fig. 11 is a cross-sectional view showing a plane mirror 41C of a third embodiment, and Fig. 12 is a cross-sectional view showing a plane mirror 41D of a fourth embodiment.

[0081] The plane mirror 41 of the first embodiment described above prevents infrared light J and P-polarized light G of visible light I contained in external light such as sunlight from heading toward the TFT panel unit 3, thereby improving the heat blocking properties against external light. However, with the plane mirror 41 of the first embodiment, as shown in FIG. 8, there is a possibility that part of the light (infrared light J and P-polarized light G) that has passed through the reflective layer 411 is reflected by the rear surface of the base material 413, passes through the reflective layer 411 again, and heads toward the TFT panel unit 3. The temperature rise of the TFT panel unit 3 due to such re-transmitted light is as high as that of sunlight of 1,000 W / m 2 The temperature may reach approximately 10° C. Furthermore, if light transmitted through the reflective layer 411 illuminates the holding member of the plane mirror 41, the shape of the holding member may be reflected in the displayed image.

[0082] As shown in Fig. 10, the plane mirror 41B of the second embodiment has a base material 413B that is light-blocking. The light-blocking base material 413B is not colorless and transparent but is colored, and is made of, for example, a black resin plate. With such a plane mirror 41B, light that has passed through the reflective layer 411 is absorbed by the base material 413B, thereby enhancing the heat-blocking effect of the plane mirror 41B. Furthermore, the light-blocking base material 413B can prevent the shape of the holding member of the plane mirror 41B from being reflected in the displayed image.

[0083] 11, in the plane mirror 41C of the third embodiment, an adhesive layer 412C has a light-blocking property. The light-blocking adhesive layer 412C is not colorless and transparent but is colored, and is made of, for example, a black adhesive. Such a plane mirror 41C can provide the same effects as the plane mirror 41B of the second embodiment.

[0084] As shown in FIG. 12 , the plane mirror 41D of the fourth embodiment includes a light-blocking layer 414 on the rear surface of the substrate 413 (the surface opposite the reflective layer 411). The light-blocking layer 414 is not colorless and transparent, but is formed of a printed layer printed with colored ink, a colored adhesive film, or the like. Such a plane mirror 41D achieves the same effects as the plane mirror 41B of the second embodiment. When the light-blocking layer 414 is formed of a printed layer, it is preferably formed of a black oil-based ink or UV-curable ink whose refractive index is close to that of the substrate 413. When the light-blocking layer 414 is formed of an adhesive film, it is preferably formed of a black adhesive film attached via an adhesive whose refractive index is close to that of the substrate 413. This configuration reduces the reflectance at the interface between the substrate 413 and the light-blocking layer 414, ensuring that the light transmitted through the reflective layer 411 is absorbed by the light-blocking layer 414.

[0085] Incidentally, when using the plane mirror 41D of the fourth embodiment, as is the case with the first to third embodiments, if the plane mirror 41D is wobbly relative to the holder 42 in such a way that the reflection axis direction Rr deviates from the desired direction, the quality of the display image generated by the head-up display 1 is likely to deteriorate.

[0086] In this regard, since the holder 42 can hold the plane mirror 41D without any rattle as described above, the possibility of such a deterioration in quality can be effectively reduced.

[0087] Furthermore, when the plane mirror 41D of the fourth embodiment is used, the light-shielding layer 414 may be pressed by the first biasing portion 431 and the second biasing portion 432, which may cause peeling or the like.

[0088] Therefore, the light-shielding layer 414 is preferably formed with a thickness that will prevent such peeling. For example, when the light-shielding layer 414 is formed of a printed layer printed with colored ink, it may be realized by overlapping printed layers printed two or more times. This reduces the possibility of peeling of the light-shielding layer 414 even when the light-shielding layer 414 is pressed by the first biasing portion 431 or the second biasing portion 432 described above.

[0089] Here, when using the plane mirror 41D of the fourth embodiment, as is the case with the first to third embodiments, there is also a risk that the reflective layer 411 may peel off from its corners (the corners corresponding to the corners between sides L1 and L3, the corners between sides L1 and L4, the corners between sides L2 and L3, and the corners between sides L2 and L4 in Figure 4) when the plane mirror 41D is inserted into the holder 42 during assembly.

[0090] Therefore, the reflective layer 411 preferably has rounded corners at the corners corresponding to the corners between sides L1 and L3, the corners between sides L1 and L4, the corners between sides L2 and L3, and the corners between sides L2 and L4. FIG. 13 shows an example of the rounded corner (see arrow 1300) of the reflective layer 411 at one corner. This reduces the possibility of the reflective layer 411 peeling off even if the reflective layer 411 interferes with the holder 42 when inserting the plane mirror 41D into the holder 42 during assembly. Also, in FIG. 13, the outer peripheral edge of the reflective layer 411 has a clearance Δ1 of approximately 0.1 to 0.5 mm from the end face of the C-plane portion of the substrate 413. This makes it difficult for the reflective layer 411 to peel off from its outer peripheral edge, thereby reducing the possibility of the reflective layer 411 peeling off. However, the clearance Δ1 may be set larger so that contact (abutment) between the holder 42 and the reflective layer 411 does not occur, as will be described later.

[0091] [Relationship between the reflective layer and the holder, etc.] Next, a preferred embodiment of the relationship between the reflective layer 411 of the plane mirror 41D according to the fourth embodiment and the holder 42 will be described with reference to Figure 14 onwards. The following embodiment will be described with respect to the plane mirror 41D according to the fourth embodiment, but can also be similarly applied to the plane mirrors 41, 41B, and 41C according to the first to third embodiments.

[0092] Fig. 14 is an explanatory diagram schematically showing how a resin film forming reflective layer 411 is rolled. Fig. 15 is a plan view showing the relationship between reflective layer 411 and substrate 413. Fig. 16 is a perspective view showing the relationship between reflective layer 411 and substrate 413. In Fig. 16, reflective layer 411 is shown by a dotted line for convenience.

[0093] Incidentally, the reflective polarizing multilayer film, which is the resin film that forms the reflective layer 411, is formed by rolling (see arrow R142) a material 1400 in a nip between rotating rolls 1450 (see arrow R140), as shown in Fig. 14. In this case, the material to be rolled may be the material after being multilayered, or the material before being multilayered.

[0094] Such resin films are prone to the following problems in high-temperature environments. For example, if stress occurs in the reflective layer 411, the reflective properties of the reflective layer 411 may become distorted, and the intended reflective properties may not be achieved. Specifically, the reflected light from the stressed area tends to appear rainbow-colored rather than white. Furthermore, if cracks occur in the reflective layer 411 due to stress or other factors, the area where the cracks occur may lose its function as a reflecting mirror.

[0095] In addition, since the linear expansion coefficient of the resin reflective layer 411 is larger than that of the inorganic glass substrate 413 (the reflective layer 411 expands more at high temperatures), the above-mentioned inconvenience is likely to occur in a high-temperature environment.

[0096] Stress that can occur in the reflective layer 411 can be caused by interference (contact, etc.) of another object such as the holder 42 with the reflective layer 411, in addition to the thermal stress described above.

[0097] Therefore, when the plane mirror 41D is held by the holder 42 as described above, if the holder 42 comes into contact with the reflective layer 411, the reflective layer 411 may be damaged, possibly causing a crack in the reflective layer 411.

[0098] Therefore, the holder 42 preferably comes into contact with a portion of the base material 413 where the reflective layer 411 is not provided.

[0099] 15, the reflective layer 411 is provided on the inside of edge portions 4131, 4132, 4133, and 4134 relating to three sides (sides L1, L3, and L4) of the plane mirror 41D, among edge portions 4131, 4132, 4133, and 4134 relating to the four sides of the base material 413. In other words, the reflective layer 411 is provided on the base material 413 in a manner that does not extend to the edge portions relating to the three sides (sides L1, L3, and L4) of the plane mirror 41D.

[0100] Here, as described above, the first portion 421 of the holder 42 abuts against the surface of the plane mirror 41D on the reflecting surface side in the A direction at the edges 4131, 4133, and 4134 on three sides (side L1, side L3, and side L4) of the plane mirror 41D.

[0101] Therefore, by forming the reflective layer 411 inside the edge portions 4131, 4133, and 4134 of the three sides (side L1, side L3, and side L4) of the plane mirror 41D, it is possible to prevent the first portion 421 from coming into contact with the reflective layer 411. Note that Fig. 16 shows a perspective view of the relationship between the first portion 421 and the reflective layer 411. This reduces the possibility that cracks or the like will occur in the reflective layer 411 due to the first portion 421.

[0102] In this way, according to this embodiment, the plane mirror 41D is reliably held by the holder , while damage that may occur to the reflective layer 411 due to interference with the holder can be reduced or prevented.

[0103] In this embodiment, when the plane mirror 41D is assembled, it is inserted into the holder 42 in such a direction that the rolling direction of the resin film of the reflective layer 411 intersects with the insertion direction (direction B) of the plane mirror 41D into the holder 42. In other words, the reflective layer 411 is formed on the base material 413 so that the rolling direction corresponds to direction C.

[0104] Incidentally, cracks that occur in the reflective layer 411 tend to occur in a direction along the rolling direction of the reflective layer 411 (direction C shown in FIG. 4, see arrow R15 in FIG. 15). Therefore, if a crack occurs on either one of the ends of the reflective layer 411 in the rolling direction, the crack may propagate to the other side along the rolling direction.

[0105] In this regard, in the present embodiment, of the first portions 421 that abut on the three sides (side L1, side L3, and side L4) of the plane mirror 41D, the first portions 421 that abut on sides L3 and L4 extend in a direction perpendicular to the rolling direction of the resin film of the reflective layer 411. Therefore, by configuring the first portions 421 so that they do not abut on the reflective layer 411, it is possible to effectively reduce the possibility that undesirable cracks or the like will occur in the reflective layer 411 due to the first portions 421.

[0106] In this embodiment, the reflective layer 411 is formed inside edge portions 4131, 4133, and 4134 of the three sides (sides L1, L3, and L4) of the plane mirror 41D so as not to come into contact with the first portions 421 that come into contact with the three sides (sides L1, L3, and L4) of the plane mirror 41D, but is not limited to this. For example, the reflective layer 411 is formed inside edge portions 4133 and 4134 (an example of a first edge portion) of two sides (sides L3 and L4) of the plane mirror 41D, but the edge portion 4131 (an example of a second edge portion) of the side L1 may be formed in such a manner that it extends outside the edge portion 4131 (for example, to the end face of the C-plane portion of the base material 413 or its vicinity). Furthermore, the reflective layer 411 is formed so that the edge 4132 (an example of a second edge) relating to the other side, side L2, extends to the end face of the C-surface portion of the substrate 413 or its vicinity, but may be formed more inward than the edge 4132 relating to side L2, as is the case with the edges 4131, 4133, 4134 relating to the three sides (sides L1, L3, and L4).

[0107] Here, as described above, the resin film for the reflective layer 411 is formed by rolling the material 1400 and then punching it into a predetermined shape (in this example, a trapezoid with parallel sides L1 and L2) using a punching die having cutting blades. The punching die may be a Thomson type or similar die that creates a step at the joint of the blade, or a Pinnacle (registered trademark) type or similar die that does not create a step.

[0108] Fig. 17 is an explanatory diagram of an example of a punching die, and is a plan view showing an example of a die 1700 that can be used when punching out the reflective layer 411. Fig. 18 is a cross-sectional view taken along line DD in Fig. 17. Fig. 19 is a schematic enlarged view of part Q3 in Fig. 17.

[0109] The die 1700 shown in FIGS. 17 and 18 is a Thomson type, and has a seam 1704 between the cutting blades 1702 as shown in FIG. 19. That is, the cutting blades 1702 are formed by butting both ends 17021 together so as to extend along the outline of a predetermined shape (in this example, a trapezoid with parallel sides L1 and L2) that matches the outline of the reflective layer 411. The seam 1704 between the both ends 17021 can cause minute notches at the seam on the edge surface (cut surface) of the cut resin film. When a minute notch is formed, cracks are more likely to occur due to force concentrating on the notch.

[0110] In this way, when a resin film is punched into a predetermined shape using cutting blade 1702 having seams 1704, cracks are likely to occur at the outer peripheral edge of the resin film at positions corresponding to the seams of cutting blade 1702. If minute notches are formed on the sides (L3 and L4) that intersect with the rolling direction (direction C shown in FIG. 4) of the resin film that forms reflective layer 411, cracks will occur due to the concentration of force at these notches, and the cracks will likely progress along the rolling direction.

[0111] Therefore, the resin film forming the reflective layer 411 is preferably cut such that the side L1 or the side L2 is cut at a straight line portion where the joint (i.e., both joined ends) of the cutting blade 1702 is located. This reduces the possibility of cracks or the like occurring in the resin film compared to when the side L3 or the side L4 is cut at a straight line portion where the joint of the cutting blade 1702 is located.

[0112] [Another example of a reflector unit] Next, another example of a reflecting mirror unit 4B will be described with reference to Figures 20 to 23. However, the same reference numerals as in the previous embodiment are used for the components common to the previous embodiment, and the description of the previous embodiment will be used.

[0113] Fig. 20 is a perspective view showing another example of reflecting mirror unit 4B. Fig. 21 is an exploded perspective view showing another example of reflecting mirror unit 4B. Fig. 22 is a perspective view of a main part showing another example of reflecting mirror unit 4B. Fig. 23 is a cross-sectional view of a main part showing another example of reflecting mirror unit 4B.

[0114] 21, another example of reflecting mirror unit 4B differs from the above-described embodiment in that plane mirror 41 is fixed to holder 42B with adhesive 424. Adhesive 424 is in a liquid state at least when applied, and for example, a hot melt adhesive is used.

[0115] As shown in FIGS. 20 and 21, another example holder 42B has a first surface 425 to which the plane mirror 41 is adhered, and a second surface 427 that exposes the reflective layer 411 of the plane mirror 41 through an opening 426.

[0116] As shown in Figures 21 to 23, the first surface 425 of the holder 42B has a first opposing portion 4251 that faces the portion of the base material 413 of the plane mirror 41 where the reflective layer 411 is not provided, a second opposing portion 4252 that faces the reflective layer 411 of the plane mirror 41, a plurality of adhesive portions 4253 to which the plane mirror 41 is fixed via adhesive 424, a plurality of abutment portions 4254 that determine the thickness of the adhesive 424, and a plurality of grooves 4255 that accommodate excess adhesive.

[0117] The adhesive portions 4253 are provided on the first opposing portion 4251, and portions of the base material 413 of the plane mirror 41 where the reflective layer 411 is not provided are fixed via an adhesive 424. In the example shown in Fig. 21 , the adhesive portions 4253 are provided at three locations on the first surface 425 along the edge of the opening 426, and three sides of the plane mirror 41 are fixed to the adhesive portions 4253 via the adhesive 424.

[0118] The contact portions 4254 protrude from the first opposing portion 4251 and come into contact with portions of the base material 413 of the plane mirror 41 where the reflective layer 411 is not provided, thereby determining the distance between the base material 413 of the plane mirror 41 and the adhesive portion 4253, i.e., the thickness of the adhesive 424. In the example shown in Fig. 21 , the contact portions 4254, each having a rectangular flat surface as a contact surface, protrude from the four corners of the first surface 425. The contact portions 4254 shown in Fig. 21 have a relatively small contact area and contact length with the plane mirror 41, but the number, contact area, and contact length of the contact portions 4254 can be changed as appropriate as long as the thickness of the adhesive 424 can be determined.

[0119] The groove 4255 is provided between the adhesive portion 4253 and the opening 426, parallel to the adhesive portion 4253. The length of the groove 4255 is approximately the same as or longer than the adhesive portion 4253. Such a groove 4255 accommodates excess adhesive that is pressed between the adhesive portion 4253 and the plane mirror 41 and flows toward the opening 426 during the bonding process of the plane mirror 41, thereby preventing excess adhesive from flowing into the opening 426, which is the reflective area of the plane mirror 41.

[0120] It is desirable that the cross-sectional shape of groove 4255 be a V-groove shape. If groove 4255 has a rectangular cross-sectional shape, surface tension makes it difficult for excess adhesive to flow into groove 4255, whereas V-groove-shaped groove 4255 can suppress surface tension and promote the flow of excess adhesive.

[0121] 23, the reflective layer 411 of the plane mirror 41 is maintained in a state where it is separated from the second opposing portion 4252 by a predetermined distance, since contact with the second opposing portion 4252 could cause cracks. However, this distance is small, and excess adhesive could adhere to the reflective layer 411 and cause cracks. As shown in FIG. 23, the groove 4255 is located between the adhesive portion 4253 and the second opposing portion 4252, and can contain excess adhesive just before the reflective layer 411, preventing it from adhering to the reflective layer 411.

[0122] 23 , if the groove 4255 overlaps with the reflective layer 411, it is desirable to provide the groove 4255 so that the center position of the groove width is closer to the adhesive portion 4253 than to the end face of the reflective layer 411. In this way, the distance between the end face of the reflective layer 411 and the groove bottom of the groove 4255 can be increased, and excess adhesive can be prevented from adhering to the reflective layer 411.

[0123] Although each embodiment has been described in detail above, it is not limited to the specific embodiment, and various modifications and changes are possible within the scope of the claims. It is also possible to combine all or a plurality of components of the above-described embodiments. [Explanation of symbols]

[0124] 1 Head-up display 2 cases 3 TFT panel unit 4 Reflector unit 5 concave mirror 6 Backlight unit 7 Heat dissipation material 71 Finn 9. Instrument panel 41 Plane mirror 41B Plane mirror 41C plane mirror 41D plane mirror 42 Holder 411 Reflective layer 412 Adhesive layer 412C adhesive layer 413 Base material 413B Base material 414 Light blocking layer 418 Side 420 base 421 Part 1 422 Part 2 423 Part 3 431 1st biasing section 432 Second biasing section 433 Third biasing section 441 1st Information Department 442 2nd Information Department 443 3rd Information Department 443A 3rd guide section 4200 Flat section 4201 Rib 4202 Frame 4205 Window 4211 Tapered part 4221 Opening 4320 Edge 4322 Return part 4328 2nd plane 4329 2nd slope 4421 Edge 4422 Tapered section 4432 Tapered section 43221 1st slope 43222 1st plane 43281 Curved surface 44211 Curved surface 4B Reflector unit 42B holder 424 Adhesive 425 Page 1 4251 First opposing part 4252 Second opposing part 4253 Adhesive part 4254 Contact part 4255 Groove 426 Opening 427 2nd page

Claims

1. A housing (2), a display device (3+6) that emits display light; a plane mirror (41) that reflects the display light; a holder (42) for holding the plane mirror; the plane mirror has a substrate and a reflective layer provided on the substrate and including a resin film; The holder abuts against a portion of the base material where the reflective layer is not provided.

2. the substrate includes first edge portions on both sides in a first direction (C) along the rolling direction of the resin film and second edge portions on both sides in a second direction (B) intersecting the first direction, the reflective layer is provided on the base member on an inner side than the first edge portion, 2. The head-up display (1) according to claim 1, wherein the holder abuts the first edge.

3. a resin film is prepared by cutting a resin film material formed by rolling into the predetermined shape using a cutting blade having both ends butted together so as to extend along the outer shape of the predetermined shape; a reflective layer including the resin film is provided on a substrate; The method includes inserting and holding a plane mirror including the substrate on which the reflective layer is provided into a holder of a head-up display, The cutting blade has both ends on a side of the predetermined shape that is along the rolling direction of the resin film.

4. The method for manufacturing a head-up display (1) according to claim 3, wherein the plane mirror is inserted into the holder in an insertion direction that intersects with a rolling direction of the resin film.

5. The head-up display (1) according to claim 1 or 2, wherein the holder has an adhesive portion (4253) to which a portion of the base material on which the reflective layer is not provided is fixed via an adhesive (424).

6. The holder is A facing portion (4252) facing the reflective layer; 6. The head-up display (1) according to claim 5, further comprising a groove (4255) formed between the adhesive portion and the opposing portion.

7. The holder is an opening (426) exposing the reflective layer; A head-up display (1) according to claim 5 or 6, further comprising a groove (4255) formed between the adhesive portion and the opening.

8. the holder includes an abutment portion (4254) that abuts against a portion of the base material on which the reflective layer is not provided, The head-up display (1) according to any one of claims 5 to 7, wherein the abutment portion defines a thickness of the adhesive applied to the adhesive portion.

Images