Head-up display device

Abstract

To provide a head-up display device that is easy to assemble despite including a combiner and a dustproof cover.SOLUTION: An HUD device 1 includes a case 10 having an opening 11 in its upper surface and accommodating a display 20 that emits display light LT toward the opening 11, a dustproof cover 12 placed on the upper surface to block the opening 11 while allowing the display light LT to pass through, and a holder 40 that holds a combiner 30 onto which the display light LT emitted from the opening 11 is projected. The holder 40 is positioned on top of the dustproof cover 12 and clamps the upper surface of the case 10 and the dustproof cover 12.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a head-up display device. [Background technology]

[0002] Some head-up display devices have a case opening through which display light emitted by a display is emitted, covered with a dustproof cover, and a projection member onto which the display light is projected is provided near the dustproof cover.

[0003] For example, Patent Document 1 discloses a head-up display device that includes a dust cover that covers an opening in a case and a projection member that has a rotation axis around the periphery of the opening and rises and falls as the rotation axis rotates. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-20945 Summary of the Invention [Problem to be solved by the invention]

[0005] Some head-up display devices have a holder that holds a projection member and is attached to the periphery of an opening in a case. However, because a dust cover is provided over the opening, the structure becomes complicated, which can result in complicated assembly of the head-up display device.

[0006] The present invention has been made to solve the above-mentioned problems, and has an object to provide a head-up display device that is easy to assemble despite being provided with a projection target member and a dustproof cover. [Means for solving the problem]

[0007] In order to achieve the above object, the head-up display device of the present invention comprises: a case having an opening on an upper surface thereof and accommodating a display device that emits display light toward the opening; a dustproof cover placed on the upper surface portion to cover the opening and to transmit the display light; a holder for holding a projection member onto which the display light emitted from the opening is projected; Equipped with The holder is disposed on the dustproof cover and holds the dustproof cover between the upper surface of the case and the holder. [Effects of the Invention]

[0008] According to the configuration of the present invention, assembly is easy despite the inclusion of a combiner and a dust cover. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic cross-sectional view of a head-up display device according to an embodiment of the present invention. [Figure 2] 1 is a conceptual diagram of a vehicle equipped with a head-up display device according to an embodiment. [Figure 3] 1 is a perspective view of a head-up display device according to an embodiment. [Figure 4] 1 is a perspective view of a head-up display device according to an embodiment, taken along a plane perpendicular to the left-right direction, viewed from slightly below in the left-right direction. FIG. [Figure 5] FIG. 5 is an enlarged view of the V region shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, a head-up display device according to an embodiment of the present invention will be described in detail with reference to the drawings. In the drawings, identical or equivalent parts are denoted by the same reference numerals. In the specification, the terms "front, rear, left, right, top, bottom" refer to the front, rear, left, right, top, bottom of a vehicle in which the head-up display device is installed.

[0011] A head-up display device (hereinafter referred to as HUD device) according to an embodiment is a device that is installed in a vehicle and projects display light that represents an image, for example, an image including information about the vehicle (such as vehicle speed and navigation information; hereinafter referred to as vehicle information), onto a projection member. In this HUD device, to facilitate assembly, a dustproof cover that covers the opening of the case is incorporated into the device by being sandwiched between the case and a holder that holds the projection member.

[0012] The configuration of the HUD device will be described below using an example in which the projection target member is a combiner. First, the overall configuration of the HUD device will be described with reference to Figs.

[0013] As shown in FIG. 1, the HUD device 1 includes a case 10, a display 20, and a combiner 30.

[0014] The case 10 is formed in a box shape to accommodate components therein. An opening 11 is formed in the case 10, and the case 10 is placed on the instrument panel 3 of the vehicle 2 with the opening 11 facing upward. The opening 11 is covered with a dustproof cover 12 made of a colorless and transparent material to prevent foreign matter from entering. A display 20 is accommodated in the case 10 to emit display light LT from the opening 11 through the dustproof cover 12.

[0015] The display device 20 has a backlight 21 that emits light to generate display light LT, and a liquid crystal panel 22 that adjusts the degree of light transmission of the backlight 21 to generate the display light LT that displays an image.

[0016] The backlight 21 is composed of, for example, a plurality of LEDs (Light Emitting Diodes). The backlight 21 is turned on based on a command signal output by a microcomputer (not shown), and emits light at a brightness based on the command signal when turned on. A liquid crystal panel 22 is disposed above the backlight 21, and the backlight 21 illuminates the liquid crystal panel 22 when turned on.

[0017] The liquid crystal panel 22 is configured, for example, by a transmissive TFT (Thin Film Transistor) liquid crystal panel. The liquid crystal panel 22 has a display section in which a plurality of pixels are arranged in a matrix, and is controlled by a driver (not shown) to change the light transmittance of each pixel. The liquid crystal panel 22 is irradiated by the backlight 21 described above, and adjusts the light transmittance for each pixel to generate display light LT containing an image. The liquid crystal panel 22 is disposed with its panel surface facing upward, and emits the generated display light LT upward as shown in FIG. 1. As a result, the display device 20 emits the display light LT upward from the opening 11 of the case 10 through the dustproof cover 12. A combiner 30 is provided above the case 10, and as a result, the display light LT is incident on the combiner 30.

[0018] The combiner 30 is formed in the shape of a rectangular flat plate. As shown in FIG. 1, the combiner 30 is held by a holder 40 so as to stand on the case 10. Specifically, the holder 40, which is slightly inclined toward the rear B, is provided on the front and upper surface of the case 10. The combiner 30 is attached to the rear B surface of the holder 40. As a result, the combiner 30 stands on the dust cover 12 of the opening 11 with its plate surface inclined toward the rear B. The plate surface is inclined toward the driver's seat of the vehicle 2 behind the windshield 5 shown in FIG. 2. As a result, the combiner 30 reflects the display light LT and causes the reflected light to reach the driver 4 (also referred to as a user) sitting in the driver's seat behind the rear B. As a result, the image of the display light LT is visually recognized by the driver 4.

[0019] In such a HUD device 1, not only is the dustproof cover 12 attached to the case 10, but the holder 40 that holds the combiner 30 is also attached to the case 10. This makes the structure of the HUD device 1 complex. As a result, assembly of the HUD device 1 tends to be complicated, and there is a demand for a HUD device 1 that is easy to assemble. Therefore, in order to facilitate assembly, the HUD device 1 places the dustproof cover 12 on the case 10, and then places the holder 40 that holds the combiner 30 on top of the case 10, thereby sandwiching the dustproof cover 12 between the case 10 and the holder 40.

[0020] Next, the configurations of the case 10, the dustproof cover 12, and the holder 40 will be described in more detail with reference to FIGS.

[0021] As shown in Fig. 3, the case 10 has a left side surface 13 extending in the front-rear and up-down directions, a rear surface 14 extending in the left-right and up-down directions, and a right side surface 15 facing the left side surface 13 in the left-right direction. Furthermore, as shown in Fig. 4, the case 10 has a front surface 16 facing the rear surface 14 in the front-rear direction.

[0022] The left side surface portion 13, the rear surface portion 14, the right side surface portion 15, and the front surface portion 16 form a space that houses the display device 20 and an internal space through which the display light LT from the display device 20 is directed toward the opening 11. In order to direct the opening 11, which is located above the internal space, in the desired direction, the upper end portion of the rear surface portion 14 is higher than the upper end portion of the front surface portion 16, as shown in FIG. 4. As a result, the rear B peripheral edge of the opening 11 is higher than the front F peripheral edge. As a result, the dust cover 12 that covers the opening 11 is inclined in a direction that increases in height toward the rear B. This prevents the dust cover 12 from reflecting external light and catching on the combiner 30.

[0023] 3, the upper end portions of the left side surface 13 and the right side surface 15 are each formed in a shape that curves slightly downward. As will be described later, the dustproof cover 12 is positioned by being pressed against the upper end portions of the left side surface 13 and the right side surface 15 by the holder 40. The upper end portions of the left side surface 13 and the right side surface 15 each have the above-described shape, thereby curving the dustproof cover 12. As a result, external light is less likely to be reflected by the dustproof cover 12 and be reflected onto the combiner 30.

[0024] Furthermore, as shown in FIG. 4, the upper end portion of the rear surface portion 14 protrudes rearward B in a canopy-like shape. The rear end portion of the dustproof cover 12 is placed over the upper end portion of the rear surface portion 14 as shown in FIG. 3, and the rear end portion of the dustproof cover 12 is fastened by a pin 17 having a needle-like shape that extends from the center of the disk in a direction perpendicular to the disk. As will be described later, the rear B side of the holder 40 is open to allow the display light LT to be emitted. By fastening the rear end portion of the dustproof cover 12 to the rear surface portion of the case 10 in this manner, the dustproof cover 12 is fixed without blocking the display light LT. Furthermore, the dustproof cover 12 is fixed by a means that allows for easy assembly.

[0025] In contrast, as shown in Figure 3, the holder 40 has a front cover portion 41 with a slope that slopes upward toward the rear B, a top cover 42 that covers the upper part of the front cover portion 41 and extends from the upper part of the front cover portion 41 toward the rear B, a left side wall portion 43 that extends from the left end of the front cover portion 41 rearward B beyond the combiner 30 and covers the left side L, and a right side wall portion 44 that extends from the right end of the front cover portion 41 rearward B beyond the combiner 30 and covers the right side R.

[0026] The front cover part 41 is disposed on the front surface 16 of the above-described case 10 shown in FIG. 4 , with the dustproof cover 12 sandwiched therebetween. The front cover part 41 extends in the left-right direction along the front surface 16 and also extends diagonally rearward and upward. This forms the above-described inclined surface on the dustproof cover 12. The combiner 30 is attached to this inclined surface, i.e., the inner wall of the front cover part 41. As described above, the combiner 30 reflects the display light LT that has passed through the dustproof cover 12. This causes the display light LT to travel rearward B.

[0027] Furthermore, as shown in Fig. 5, a plurality of protrusions 411 are formed on the lower end portion of the front cover part 41. Note that in Fig. 5, for the sake of simplicity, the plurality of protrusions 411 are shown in the shape of banks.

[0028] To explain in more detail, conventionally, dustproof covers are fixed to the case with adhesive tape. However, in the HUD device 1, as described above, the dustproof cover 12 is fastened to the case 10 with pins 17. For this reason, the HUD device 1 is more likely to have water droplets seep into the case 10 than a conventional HUD device that uses adhesive tape.

[0029] On the other hand, as described above, the dustproof cover 12 is inclined in a direction that increases in height toward the rear B. In other words, the dustproof cover 12 decreases in height toward the front F. As a result, when condensation occurs on the HUD device 1, water droplets tend to collect on the front end side of the dustproof cover 12. Since the possibility of water droplets entering the case 10 is higher than in the past, there is a risk that water collected on the front end side of the dustproof cover 12 will enter the inside of the case 10.

[0030] To drain this water, a plurality of protrusions 411 are arranged in the left-right direction at the bottom end of the front cover portion 41, with gaps between them that allow water to pass through. They may be shaped, for example, like a cylinder or a prism. Having this configuration, the front cover portion 41 can drain water forward F, i.e., to the outside of the HUD device 1. As a result, the front cover portion 41 prevents water from pooling and flowing into the case 10.

[0031] As shown in FIG. 3 , the left side wall 43 is disposed on the left side surface 13 of the case 10, sandwiching the dust cover 12 therebetween. The left side wall 43 extends in the front-to-rear direction along the left side surface 13 and also extends upward. The lower end portion of the left side wall 43 has a shape that curves slightly downward. As described above, the upper end portion of the left side surface 13 of the case 10 also has a shape that curves slightly downward. Due to this shape, the lower end portion of the left side wall 43 fits into the upper end portion of the left side surface 13 of the case 10, with the dust cover 12 sandwiched between them. The left side wall 43 is joined by fastening a joint 431 that protrudes to the left to a joint 131 provided on the left side surface 13 of the case 10 with a screw.

[0032] Furthermore, the right side wall 44 is disposed on the right side surface 15 of the case 10, sandwiching the dust cover 12 therebetween, and extends in the front-to-rear direction along the right side surface 15 while also extending upward. Furthermore, the lower end portion of the right side surface 44 has a shape that curves slightly downward, similar to the lower end portion of the left side surface 43. As described above, the upper end portion of the right side surface 15 of the case 10 also has a shape that curves slightly downward. Due to this shape, the lower end portion of the right side surface 44 fits into the upper end portion of the right side surface 15 of the case 10, with the dust cover 12 sandwiched between them. Furthermore, the right side surface 44 is joined by a joint 441 that protrudes to the right being fastened with a screw to a joint 151 provided on the right side surface 15 of the case 10.

[0033] The left side wall 43 and the right side wall 44 sandwich the dust cover 12 between the left side surface 13 and the right side surface 15 of the case 10. In other words, the dust cover 12 is sandwiched between them. Conventionally, dust covers have been attached to the case with adhesive tape, but in the HUD device 1, the dust cover 12 is fixed simply by placing the dust cover 12 over the left side surface 13 and the right side surface 15 of the case 10 and then placing the left side surface 43 and the right side surface 44 of the holder 40 on top of the dust cover 12. In this way, the left side wall 43 and the right side wall 44 make it easy to assemble the HUD device 1.

[0034] The left side wall 43 and the right side wall 44 have lower end portions that curve slightly downward, and the dustproof cover 12 is curved by fitting it along this shape. The left side wall 43 and the right side wall 44 also determine its position. This allows the dustproof cover 12 to be easily attached to the HUD device 1 and to be easily positioned.

[0035] As described above, in the HUD device 1 according to the embodiment, the holder 40 is disposed on the dustproof cover 12 and holds the upper end portions of the left side surface 13 and the right side surface 15 of the case 10, i.e., the upper surface of the case 10 and the dustproof cover 12. This makes it easy to attach the dustproof cover 12, and therefore makes it easy to assemble the HUD device 1.

[0036] In the HUD device 1, the upper end portions of the left side surface 13 and the right side surface 15 of the case 10 are curved, and the lower end portions of the left side wall 43 and the right side wall 44 of the holder 40 are similarly curved. The dust cover 12 is flexible and is sandwiched between the left side surface 13 and the right side surface 15 of the case 10 and the left side wall 43 and the right side wall 44 of the holder 40. The dust cover 12 is fixed by being sandwiched between the left side surface 13 and the right side surface 15 of the case 10 and the left side wall 43 and the right side wall 44 of the holder 40, and the position of the surface of the dust cover 12 is determined. This makes it easy to attach the dust cover 12. As a result, the HUD device 1 is easy to assemble.

[0037] Furthermore, since the rear B side of holder 40 is open, dustproof cover 12 cannot be sandwiched between it and the top surface of case 10, but dustproof cover 12 is fastened to holder 40 at the rear B side of holder 40 by pins 17. Since it is fastened only by pins 17, dustproof cover 12 can be easily attached.

[0038] Furthermore, the lower end portion of the front cover part 41 of the holder 40 is formed with a plurality of protrusions 411 with gaps that allow water to pass through, so that water can be discharged from the gaps to the front F of the front cover part 41. As a result, the HUD device 1 can prevent water from accumulating due to condensation or the like and from entering the inside of the case 10.

[0039] The upper end portions of the left side surface 13 and right side surface 15 of the case 10 are specific examples of the first opening periphery and the second opening periphery defined in the claims. The left side wall 43, the right side wall 44, and the front cover 41 of the holder 40 are specific examples of the first side wall, the second side wall, and the support wall defined in the claims.

[0040] Although the head-up display device according to the embodiment of the present invention has been described above, the present invention is not limited to this.

[0041] In the embodiment, the display 20 has a liquid crystal panel 22, but instead of the liquid crystal panel 22, it may have a dial plate on which symbols, letters, etc. indicating vehicle information are displayed. The display 20 may emit display light LT including images of the symbols, letters, etc. on the dial plate by illuminating the dial plate with the backlight 21. Alternatively, the display 20 may have the dial plate in addition to the liquid crystal panel 22, and generate the display light LT by illuminating the liquid crystal panel 22 and the dial plate with the backlight 21.

[0042] Furthermore, in the above embodiment, the dustproof cover 12 of the case 10 is curved, but the dustproof cover 12 does not necessarily have to be curved. In other words, the dustproof cover 12 may be a flat plate. [Explanation of symbols]

[0043] 1 HUD device 2 vehicles 3. Instrument panel 4. Driver 5 Windshield 10 cases 11 Aperture 12 Dustproof cover 13 Left side part 14 Rear part 15 Right side part 16 Front part 17-pin 20 Display 21 Backlight 22 LCD panel 30 Combiner 40 Holder 41 Front cover 42 Top cover 43 Left side wall 44 Right side wall 131 Joint 151 Joint 411 Protrusion 431 Joint 441 Joint B Back F forward L left side R right side LT display light

Claims

1. a case having an opening on an upper surface thereof and accommodating a display device that emits display light toward the opening; a dustproof cover placed on the upper surface portion to cover the opening and to transmit the display light; a holder that holds a projection member onto which the display light emitted from the opening is projected; Equipped with the holder is disposed on the dustproof cover and holds the dustproof cover between the upper surface of the case and the holder; Head-up display device.

2. the dustproof cover is fastened to the top surface of the case by a pin at a portion that is not sandwiched between the holder and the top surface of the case; The head-up display device according to claim 1 .

3. The top surface of the case is a first opening periphery portion located on one of both sides of the opening and curved downward; a second opening rim portion located on the other of the two sides of the opening and curved downward; and The holder is a first side wall portion provided on one of both sides of the projection member and having a lower end portion curved upward; a second side wall portion provided on the other of the two sides of the projection member and having a lower end portion curved upward; and the dustproof cover is flexible and curved by being sandwiched between the first opening peripheral edge portion and the first side wall portion and between the second opening peripheral edge portion and the second side wall portion; The head-up display device according to claim 1 or 2.

4. the holder is provided with the first side wall portion and the second side wall portion on both sides thereof, and further has a support wall portion that supports the projection member from a direction opposite to a direction in which the projection member reflects the display light, The lower end portion of the support wall portion has a plurality of protrusions, The gaps between the plurality of protrusions have a size that allows water to pass through. The head-up display device according to claim 3 .

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