JP2015072422A - In-vehicle display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an in-vehicle display device which is reduced in size and yet offers an improved anti-glare property against sunlight and endurance against external damage.SOLUTION: An HUD device 1 makes an aspherical mirror 13 reflect a superimposing image displayed on a display source 12 to project the image on a windshield WS of a vehicle to allow a driver to view a virtual image of the superimposing image superimposed on the foreground. A translucent cover member 14, through which light L1 of the superimposing image transmits, is provided on a light path from the aspherical mirror 13 to the windshield WS. On a surface of the translucent cover member 14 on the aspherical mirror 13 side, a prism surface 15 is formed comprising a plurality of prisms 151, each having a sloped surface 153 inclined toward the windshield WS side in the front-to-rear direction of the vehicle and a ridge line 152 extending in a width direction of the vehicle, arranged in the front-to-rear direction of the vehicle.

Description

  The present invention relates to a vehicle display device that superimposes and visually recognizes a foreground of a vehicle and a virtual image of a superimposing image projected on a windshield.

  In recent years, with the increase and diversification of information required by the driver during driving, information that cannot be displayed due to space in the meter unit is displayed as a virtual image on the windshield, and the vehicle is seen through it A projection-type vehicle display device called a head-up display device (hereinafter referred to as a HUD device) that is superimposed on the foreground is used.

FIG. 3 is a schematic diagram showing a HUD device as a conventional example. The HUD device 5 shown in FIG. 3 is provided in the instrument panel IP of the vehicle, and projects a superimposed image such as a navigation image on the windshield WS from the opening IPa of the instrument panel IP. The HUD device 5 includes a case 51, a display source 52, and an aspherical mirror 53. Further, a translucent cover member 54 is fitted into a portion of the case 51 that overlaps the opening IPa of the instrument panel IP. The light L5 forming the superimposing image displayed on the display source 52 is reflected by the aspherical mirror 53 as shown by the broken line in the figure, and passes through the translucent cover member 54 as follows. It passes through. In FIG. 3, the transmission path of the light L5 is shown in the enlarged view A5. The light L5 reflected by the aspherical mirror 53 enters the lower surface of the translucent cover member 54 at an incident angle φ5 _in . Incident angle .phi.5 _in is the angle between the normal V5 ₁ of this undersurface. Thereafter, refracted on the side closer to the normal V5 _1, reaching to the upper surface through the interior of the translucent cover member 54. Then, when emitted from the top surface, the light L5 is refracted on the side away from the normal V5 ₂ of the top surface is emitted at emission angle .phi.5 _out. Output angle .phi.5 _out is the angle between the normal V5 ₂ of this upper surface. Here, since the lower surface of the normal V5 ₁ and the upper surface normal V5 ₂ of substantially coincides becomes substantially equal to the angle of incidence angle .phi.5 _in the exit angle .phi.5 _out above. That is, the light L5 apparently passes through the translucent cover member 54 substantially straight. After emission, the light L5 travels to the windshield WS. As a result, the image for superimposition is projected onto the windshield WS with the projection size Sz5, and the foreground of the vehicle viewed through the windshield WS and the virtual image of the image for superimposition are displayed from an eye point (not shown) in the vehicle. It will be visually recognized superimposed.

  Here, generally, the HUD device is often required to be downsized due to the nature of being provided in the instrument panel IP. However, if a small display source or mirror is used for this miniaturization, there is a problem that the projection size of the superimposed image onto the windshield WS becomes small.

  Accordingly, a technique has been proposed in which the following prism surface is formed on the upper surface of the translucent cover member, and the size of the HUD device is reduced while maintaining the projection size of the superimposed image by this prism surface (see Patent Document 1). ).

FIG. 4 is a schematic view showing a HUD device in which a prism surface is formed on the upper surface of the translucent cover member. In this HUD device 6, the light L <b> 6 that forms a superimposition image that exits the display source 62 and is reflected by the aspherical mirror 63 passes through the light-transmitting cover member 64 with the prism surface 65 through the following path. To do. In FIG. 4, the transmission path of the light L6 is shown in the enlarged view A6. The light L6 reflected by the aspherical mirror 63 enters the lower surface of the translucent cover member 64 at an incident angle φ6 _in . Incident angle .phi.6 _in is an angle formed between a normal line V6 ₁ of the lower surface. Thereafter, refracted on the side closer to the normal V6 _1, it reaches the prism surface 65 formed on the upper surface through the interior of the translucent cover member 64. The prism surface 65 is formed by arranging a plurality of prisms 651 in the vehicle front-rear direction indicated by an arrow D6 in FIG. Each prism 651 has its ridge 652 extending in the vehicle width direction orthogonal to the front-rear direction. The light L6 that has reached the prism surface 65 is emitted from the inclined surface 653 of the prism 651 constituting the prism surface 65. Light L6 at this exit is away from the normal V6 ₂ of the inclined surface 653 and is refracted on the side closer to the lower surface of the normal V6 _1, output angle .phi.6 _out forming between the normal V6 ₁ of this undersurface Exit with Due to the emission from the inclined surface 653, the emission angle φ6 _out becomes smaller than the incident angle φ6 _in . That is, the light L6 is a translucent cover member 64 with the prism surface 65, apparently transmitted is refracted on the side closer to the lower surface of the normal V6 _1.

Here, the projection size Sz6 of the superimposed image formed by the light L6 onto the windshield WS is shown in FIG. 3 if the optical path from the translucent cover member 64 to the windshield WS is as follows. It becomes substantially the same size as the projection size Sz5 of the superimposed image. That is, if the optical path is substantially the same as the optical path from the translucent cover member 54 to the windshield WS in the configuration shown in FIG. 3, the two projection sizes Sz5 and Sz6 are substantially the same size. It becomes. In order to match the optical paths of both, if the exit angle φ6 _out from the translucent cover member 64 is substantially the same as the exit angle φ5 _out from the translucent cover 54 without the prism surface shown in FIG. Good. In this case, the incident angle φ6 _in to the translucent cover member 64 is greater than the incident angle φ5 _in to the translucent cover 54 without a prism surface in order to emit the light L6 at the above-described exit angle φ6 _out. Will be greatly increased. As a result, the optical path of the light L6 from the aspherical mirror 63 to the translucent cover member 64 lies on the horizontal side, and the height dimension of the cross section is reduced. The HUD device 6 shown in FIG. 4 utilizes this, and the display source 62 and the aspherical mirror 63 that are smaller in the height direction than the display source 52 and the aspherical mirror 53 shown in FIG. Is adopted. As a result, the case 61 can be downsized in the height direction, and thus the HUD device 6 can be downsized.

JP 2004-20605 A

  However, in the HUD device 6 shown in FIG. 4, sunlight reflected by the prism surface 65 provided on the translucent cover member 64 is further reflected by the windshield WS and reaches the driver's eyes. There was a problem that the eyes could be dazzled. Further, there is a problem that the prism surface 65 exposed to the outside is easily damaged.

  Therefore, an object of the present invention is to provide a vehicular display device that is improved in antiglare property against sunlight and durability against damage while being downsized.

  In order to achieve the above object, a vehicle display device according to claim 1 is configured to reflect an image for superimposition displayed on a display source by a mirror and project it onto a windshield of the vehicle, thereby preventing an eye point in the vehicle. In the vehicle display device that superimposes and visually recognizes the foreground of the vehicle viewed through the windshield and the virtual image of the superimposing image projected on the windshield, light from the mirror to the windshield On the road, a translucent cover member through which light forming the superimposing image is transmitted is disposed, and on the mirror-side surface of the translucent cover member, the windshield side extends from the front to the rear of the vehicle. A prism surface is formed by arranging a plurality of prisms having an inclined surface and ridge lines extending in the width direction of the vehicle in the front-rear direction of the vehicle. And wherein the Rukoto.

  The vehicle display device according to claim 2 is the vehicle display device according to claim 1, wherein the translucent cover member is inclined toward the windshield from the front to the rear of the vehicle. Features.

  The vehicle display device according to claim 3 is the vehicle display device according to claim 2, wherein the translucent cover member is convexly curved toward the mirror in the front-rear direction of the vehicle. Features.

  In the vehicle display device according to the first aspect, the light forming the superimposing image is bent toward the windshield by the translucent cover member on which the prism surface is formed. Therefore, even if the optical path from the mirror to the translucent cover member is laid horizontally and the height of the cross section is suppressed, the optical path from the translucent cover member to the windshield is not formed on the prism surface. It is possible to have substantially the same optical path. If the height dimension of the cross section of the optical path from the mirror to the translucent cover member is suppressed, the height of the mirror and the display source can be reduced and the vehicle display device can be miniaturized. On the other hand, if the optical path from the translucent cover member to the windshield is substantially the same as that in the case where the prism surface is not formed, the projection size of the image for superimposing on the windshield is also approximately the same between the two. . That is, according to the vehicle display device of the first aspect, the vehicle display device can be reduced in size while maintaining the projection size of the image to be superimposed on the windshield. Here, the sunlight that is inserted through the windshield from the front of the vehicle is reflected on both the upper and lower surfaces of the translucent cover member and travels toward the windshield, and is further reflected by the windshield and travels toward the driver. At this time, the prism surface is formed on the lower surface of the translucent cover member. And most of the sunlight which goes to the lower surface through the inside of the translucent cover member is reflected by the inclined surface inclined toward the windshield from the front to the rear of the vehicle, which the prism constituting the prism surface has. The For this reason, the sunlight reflected by the lower surface of a translucent cover member is reflected in the direction inclined toward the windshield rather than the sunlight reflected by the upper surface. As a result, when the light is further reflected by the windshield and travels toward the driver side, the sunlight reflected on the lower surface follows a path separated from the driver's eyes downwardly than the sunlight reflected on the upper surface. In other words, in the vehicle display device according to the first aspect, the antiglare property against sunlight reflected by the prism surface provided for miniaturization is improved. Furthermore, in the vehicle display device according to the first aspect, since the prism surface is formed on the lower surface of the translucent cover member and is not exposed to the outside, durability against damage is also improved. As described above, according to the vehicle display device of the first aspect, the antiglare property against sunlight and the durability against damage can be improved while downsizing.

  According to the vehicle display device of the second aspect, the translucent cover member is inclined toward the windshield from the front to the rear of the vehicle. For this reason, the sunlight reflected by the upper surface of the translucent cover member is also reflected in the direction inclined toward the windshield and follows a path away from the driver's eyes. Therefore, according to the vehicle display device of the second aspect, the antiglare property against sunlight is further improved.

  According to the vehicle display device of the third aspect, the inclination of the reflection path toward the windshield when the sunlight is reflected on the upper surface can be increased by the curvature of the translucent cover member. For this reason, the inclination height of the translucent cover member can be kept low in anticipation of an increase in the inclination. Therefore, according to the vehicle display device of the third aspect, further miniaturization can be achieved.

It is a figure which shows the HUD apparatus concerning one Embodiment of the display apparatus for vehicles of this invention. It is a schematic diagram which shows the optical path of the sunlight inserted from the vehicle front through a windshield. It is a schematic diagram which shows the HUD apparatus as one prior art example. It is a schematic diagram which shows the HUD apparatus by which the prism surface was formed in the upper surface of a translucent cover member.

  A HUD device according to an embodiment of a vehicle display device of the present invention will be described with reference to FIGS.

  FIG. 1 is a diagram showing a HUD device according to an embodiment of a vehicle display device of the present invention. The HUD device 1 shown in FIG. 1 includes a case 11, a display source 12, and an aspherical mirror 13. Further, a translucent cover member 14 is fitted into a portion of the case 11 that overlaps the opening IPa of the instrument panel IP. Although the display source 12 is not specified here, a display device such as a liquid crystal display or a CRT is given as an example. Moreover, as for the translucent cover member 14, the cover made from glass or transparent resin is mentioned as an example.

  The light L1 forming the superimposing image displayed on the display source 12 is reflected by the aspherical mirror 13 and transmitted through the translucent cover member 14 to the windshield WS, as indicated by the broken line in the figure. And so on. Thereby, the image for superimposition is projected on the windshield WS, and the foreground over the windshield WS and the virtual image of the image for superimposition are visually superposed from an eye point (not shown) in the vehicle. The display source 12 corresponds to an example of the display source according to the present invention, the aspherical mirror 13 corresponds to an example of the mirror according to the present invention, and the translucent cover member 14 corresponds to the translucent cover according to the present invention. It corresponds to an example of a member.

  In FIG. 1, the transmission path of the light L1 is shown in the enlarged view A1. The light L 1 reflected by the aspherical mirror 13 reaches the prism surface 15 formed on the lower surface of the translucent cover member 64. The prism surface 15 includes a plurality of prisms 151 arranged in the vehicle front-rear direction indicated by an arrow D1 in FIG. Each prism 151 has a ridge line 152 extending in the vehicle width direction perpendicular to the front-rear direction. The prism surface 15 corresponds to an example of a prism surface according to the present invention.

The light L 1 that has reached the prism surface 15 enters the inclined surface 153 of the prism 151 that constitutes the prism surface 15. The inclined surface 153 is a surface inclined toward the windshield WS from the front to the rear of the vehicle. When the angle formed between the upper surface normal V1 ₁ and the apparent incident angle φ1 _in to the translucent cover member 64 is substantially the incident angle formed between the inclined surface 153 and the normal V1 _2. φ1 _in ′ is larger than the apparent incident angle φ1 _in . As a result, the light L1, upon entering the inclined surface 153, than if assuming that the incident at an incident angle .phi.1 _in the apparent to the plane, refracted to the side closer to the normal line V1 ₁ of the upper surface.

Thereafter, the light L1 reaches the upper surface through the inside of the translucent cover member 64. Then, the light L1 is refracted on the side away from the normal V1 ₁ of this upper surface, and emits an output angle .phi.1 _out forming between the normal line V1 _1. Since the substantial incident angle φ1 _in ′ is increased by the inclined surface 153, the amount of refraction at the time of incidence increases, and as a result, the output angle φ1 _out becomes smaller than the incident angle φ1 _in . That is, the light L1 is a light-transmitting cover member 64 with the prism surface 15, apparently transmitted is refracted on the side closer to the normal V1 ₁ of the upper surface.

In the HUD device 1, the projection size Sz1 of the image for superimposition formed by the light L1 onto the windshield WS is as shown in FIG. 3 if the optical path from the translucent cover member 14 to the windshield WS is as follows. Is substantially the same size as the projection size Sz5 of the superimposing image shown in FIG. That is, if the optical path is substantially the same as the optical path from the translucent cover member 54 to the windshield WS in the configuration shown in FIG. 3, the two projection sizes Sz5 and Sz1 are the same size. Become. In order to match the optical paths of the two, if the exit angle φ1 _out from the translucent cover member 14 is substantially the same as the exit angle φ5 _out from the translucent cover 54 without the prism surface shown in FIG. Good. In this case, the incident angle φ1 _in to the translucent cover member 14 is greater than the incident angle φ5 _in to the translucent cover 54 without a prism surface in order to emit the light L1 at the above-described output angle φ1 _out. Will be greatly increased. As a result, the optical path of the light L1 from the aspherical mirror 13 to the translucent cover member 14 lies on the horizontal side, and the height dimension of the cross section is reduced. The HUD device 1 shown in FIG. 1 utilizes this, and the display source 62 and the aspherical mirror 13 that are smaller in the height direction than the display source 52 and the aspherical mirror 53 shown in FIG. Is adopted. As a result, the case 61 can be downsized in the height direction, and thus the HUD device 1 can be downsized. That is, in the HUD device 1 of the present embodiment, the HUD device 1 is downsized while maintaining the projection size Sz1 of the image for superimposition on the windshield WS.

  Here, sunlight passes through the windshield WS from the front of the vehicle, and a part thereof is directed to the translucent cover member 14 of the HUD device 1. In this embodiment, the anti-glare property is improved so that the driver's eyes are not dazzled by the sunlight. Hereinafter, the improvement of the antiglare property will be described with reference to FIG.

  FIG. 2 is a schematic diagram showing an optical path of sunlight inserted from the front of the vehicle through the windshield. Moreover, in this FIG. 2, the mode of reflection of sunlight LS by the translucent cover member 14 is shown in enlarged view A2. The sunlight LS is incident on the translucent cover member 14 at an incident angle φs, reflected on the upper and lower surfaces of the translucent cover member 14 as follows, and directed toward the windshield WS, and further reflected by the windshield WS. Then head to the driver DR side.

Here, in this embodiment, the translucent cover member 14 is provided to be inclined toward the windshield WS from the front to the rear of the vehicle. The upper surface reflected light LS _U reflected on the upper surface of the translucent cover member 14 at the reflection angle φ _U having the same angle as the incident angle φ _S described above is caused toward the windshield WS due to the inclination of the translucent cover member 14. Reflected in the tilted direction. As a result, the optical path of the upper surface reflected light LS _U toward and is reflected by the windshield WS to the driver DR side, and thus follow the isolated path downwardly from the eye of the driver DR.

In the present embodiment, the translucent cover member 14 is convexly curved toward the aspherical mirror 13 in the front-rear direction of the vehicle. The curvature of the translucent cover member 14, the inclination of the windshield WS side of the path of the upper surface reflected light LS _U is increased. In the present embodiment, in consideration of the increase in the inclination, the inclination height of the translucent cover member 14 is suppressed to be low, so that the HUD device 1 is further miniaturized.

The sunlight LS that is incident on the inside of the translucent cover member 14 and is refracted toward the lower surface is inclined by the prism 151 that constitutes the prism surface 15 and is inclined toward the windshield WS from the front to the rear of the vehicle. At 153, most of it is reflected. The lower surface reflected light LS _L reflected by the inclined surface 153 is refracted toward the upper surface of the translucent cover member 14 and is emitted from the upper surface at an emission angle φ _L. The emission angle φ _L of the lower surface reflected light LS _L is larger than the reflection angle φ _U of the upper surface reflected light LS _{U because} the reflection surface on the lower surface is the inclined surface 153 inclined toward the windshield WS as described above. Get smaller. That is, the lower surface reflected light LS _L travels in a direction inclined toward the windshield WS than the upper surface reflected light LS _U. As a result, when further reflected by the windshield WS toward the driver DR side, the optical path of the lower-surface reflected light LS _L follows a path away from the eyes of the driver DR below the optical path of the upper-surface reflected light LS _U. follow. That is, in the HUD device 1 of the present embodiment, the antiglare property against the sunlight LS reflected by the prism surface 15 provided for miniaturization is improved.

As described above, in the present embodiment, the inclination of the translucent cover member 14, the optical path of the upper surface reflected light LS _U also has a tracing the isolated path downwardly from the eye of the driver DR, Antiglare property is further improved. Further, the optical path of the lower surface reflected light LS _L in order to follow the lower than the optical path of the upper surface reflected light LS _U, when designing the inclination angle of the translucent cover member 14 only the optical path of the upper surface reflected light LS _U in mind, such as This simplifies the design.

  Further, in the HUD device 1 of the present embodiment, the prism surface 15 is formed on the lower surface of the translucent cover member 14 and is not exposed to the outside, so that durability against damage is also improved.

  As described above, in the HUD device 1 of the present embodiment, the antiglare property with respect to the sunlight LS and the durability with respect to the damage are improved while downsizing is achieved.

  In addition, embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention.

  For example, in the above-described embodiment, a mode in which an image for superimposition is projected onto the windshield WS by reflection from one aspherical mirror 13 is illustrated. However, the mirror used for reflection is not limited to an aspherical mirror, and may be a spherical mirror, for example. In addition, the optical path from the display source 12 to the windshield WS is not limited to the optical path reflected by one mirror, but may be an optical path in which light is guided by reflection by a plurality of mirrors, for example.

1 HUD device (one embodiment of vehicle display device)
11 Case 12 Display source (an example of display source)
13 Aspherical mirror (an example of a mirror)
14 Translucent cover member (an example of a translucent cover member)
15 Prism surface (example of prism surface)
151 Prism (an example of a prism)
152 Ridge 153 Slope

Claims (3)

By reflecting the image for superimposition displayed on the display source with a mirror and projecting it on the windshield of the vehicle, the foreground of the vehicle viewed through the windshield from the eyepoint inside the vehicle, and the windshield In the vehicular display device that visually superimposes the virtual image of the superimposed image to be projected,
On the optical path from the mirror to the windshield, a translucent cover member that transmits the light forming the superimposing image is disposed,
The mirror-side surface of the translucent cover member has an inclined surface inclined toward the windshield from the front to the rear of the vehicle, and a prism having a ridge line extending in the width direction of the vehicle. A vehicular display device having a plurality of prism surfaces arranged in a direction.   The vehicle display device according to claim 1, wherein the translucent cover member is inclined toward the windshield from the front to the rear of the vehicle.   The vehicle display device according to claim 2, wherein the translucent cover member is convexly curved toward the mirror in the front-rear direction of the vehicle.

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