JP7147373B2 - vehicle display - Google Patents

Description

The present invention relates to a vehicular display device that projects light onto a screen portion arranged in the front portion of a vehicle body.

Some vehicles are equipped with a vehicle display device (head-up display device) that projects light onto a screen such as a windshield and provides necessary information to the driver. For example, a vehicle display device is provided on the dashboard of the vehicle and projects light onto the windshield. There is a technique disclosed in Patent Document 1 as a conventional technique of such a vehicle display device.

A vehicle display device as disclosed in Patent Document 1 includes display means for emitting light, and a collimator provided on the optical path of the light emitted from the display means for collimating the light emitted from the display means. An optical system, a light guide into which the light that has passed through the collimating optical system is incident and propagates by reflecting the incident light inside, a reflecting mirror that reflects the light emitted from the light guide, and a collimator of these and a case accommodating an optical system, a light guide and a reflecting mirror.

The light guide includes a first surface and a second surface formed parallel to each other and arranged obliquely with respect to the reflecting mirror. The light guide emits part of the light reflected by the second surface from the first surface.

When the light reflected by the reflecting mirror is projected onto the windshield, the driver perceives an image projected in front of the windshield.

JP 2014-191143 A

For example, vehicular displays are housed in vehicle dashboards. The dashboard is provided with components such as gauges that indicate information necessary for vehicle travel. Therefore, the space in which the vehicle display device can be mounted is limited.

Please refer to FIG. FIG. 8 shows a vehicle display device 120 according to Patent Document 1. As shown in FIG. In the vehicular display device 120 of Patent Literature 1, the first surface 152 and the second surface 155 of the light guide 150 are inclined with respect to the vehicle width direction of the vehicle body (vehicle). By arranging the light guide 150 in this manner, the light is vertically incident on the reflecting mirror 160 .

In such a vehicular display device, the light guide is tilted forward and backward with respect to the vehicle width direction, and it becomes necessary to widen the space for assembling the vehicular display device forward and backward.

An object of the present invention is to provide a compact vehicle display device.

According to the invention according to claim 1, the case is stored in the storage portion formed in the front part of the vehicle body,
In the case, display means capable of emitting light, a collimating optical system provided on the optical path of the light emitted from the display means and collimating the light emitted from the display means, and the collimating optical system A light guide member in which the light that passes through the light guide member is incident and the incident light travels by reflecting the inside of the light guide member, and a correction member that corrects the direction in which the light emitted from the light guide member is incident and the incident light is accommodated. ,
A vehicular display device in which light that has passed through the correction member is projected onto a screen unit,
The case protrudes toward an optical path of light incident on the light guide from the outside and reflected toward the screen portion, and suppresses the reflected light from being projected onto the screen portion. including a shielding part,
the correction member is arranged to reflect light incident into the case toward the first external light shielding portion;
The light guide has a first surface and a second surface formed parallel to each other and extending along the vehicle width direction, and diffracts or reflects light passing through the interior to avoid the first external light shielding portion. and a deflection unit for emitting light from the first surface toward the screen unit, and is arranged parallel to the correction member .

As described in claim 2, preferably, the storage portion protrudes toward an optical path of light incident on the light guide from the outside and reflected toward the screen portion, so that the reflected light reaches the screen portion. It includes a second external light shield that suppresses projection.

As described in claim 3 , preferably, the incident angles of the light passing through the collimating optical system and incident on the first surface and the second surface of the light guide are the same as those of the first surface and the second surface. If the minimum angle at which the light incident on the surface 2 is totally reflected is defined as the critical angle, the angle is larger than the critical angle.

As described in claim 4 , preferably, the collimating optical system has a collimating lens that transmits light so that the light is incident on the first surface,
The collimator lens is a liquid crystal polymer lens or a lenticular lens having a light incident surface and a light exit surface substantially parallel to each other.

Preferably , the correcting member is a liquid crystal polymer lens or a lenticular lens having a light incident surface and a light emitting surface substantially parallel to each other.

Preferably , the correction member is arranged such that the light incident surface and the light exit surface are parallel to the first surface.

In the invention according to claim 1, the light guide includes a first surface and a second surface which are formed parallel to each other and extend along the vehicle width direction, and a first surface which diffracts or reflects light passing through the inside. and a deflection section for emitting from. Since the light guide has a deflecting portion that diffracts or reflects light passing through it and is emitted from the first surface, the light can be emitted from the first surface regardless of how the light guide is arranged. can be emitted. In other words, the light can be emitted from the first surface without tilting the light guide in the longitudinal direction of the vehicle body. Furthermore, the first surface and the second surface that constitute the light guide extend along the vehicle width direction of the vehicle body, so that the light guide is provided parallel to the vehicle width direction. That is, it is possible to prevent the light guide from tilting back and forth. As a result, a compact vehicular display device can be provided.

In addition, the case housing the light guide protrudes toward the optical path of the light that enters the light guide from the outside and is reflected toward the screen, thereby suppressing the reflected light from being projected onto the screen. It has the 1st external light shielding part which carries out. Since the case has the first external light shielding portion, external light that enters the light guide from the outside and is reflected by the light guide is blocked by the first external light shielding portion. As a result, it is possible to prevent the external light reflected by the light guide from being projected onto the screen. As a result, it is possible to prevent a situation in which the projected image (virtual image) becomes difficult to see due to the projection of the external light incident on the vehicle display device onto the screen portion. That is, the virtual image can be easily recognized. In addition, the correcting member reflects light that has entered the case toward the first external light shielding portion. As a result, it is possible to prevent the external light reflected by the correction member from being projected onto the screen. As a result, it is possible to further suppress the occurrence of a situation in which the projected image becomes difficult to see due to the projection of the external light incident on the vehicle display device onto the screen portion. That is, it is possible to make the virtual image easier to recognize.

In the invention according to claim 2, the storage portion formed in the front portion of the vehicle body protrudes toward the optical path of the light that enters the light guide from the outside and is reflected toward the screen portion, and the reflected light reaches the screen portion. It includes a second external light shielding portion that suppresses projection. By adopting a configuration in which external light is blocked by the first external light shielding part and the second external light shielding part, the external light reflected by the light guide can be blocked more reliably. As a result, it is possible to further suppress the occurrence of a situation in which the projected image becomes difficult to see. That is, it is possible to make the virtual image easier to recognize.

In the invention according to claim 3 , the incident angle of the light incident on the first surface and the second surface of the light guide body after passing through the collimating optical system is When the minimum angle for total reflection is defined as the critical angle, the angle is larger than the critical angle. By setting the incident angle of light to the first surface and the second surface to be larger than the critical angle, the light incident on the first surface and the second surface is totally reflected. As a result, the light incident on the light guide can be reflected inside the light guide without loss of light energy. As a result, it becomes unnecessary to form a reflective film for reflecting light on the first surface or the second surface in order to increase the reflectance. Thereby, an inexpensive vehicle display device can be provided.

In the invention according to claim 4 , the collimating optical system has a collimating lens that transmits light so that the light is incident on the first surface. A collimator lens is a liquid crystal polymer lens or a lenticular lens in which a light incident surface and a light exit surface are formed substantially parallel to each other. The collimating lens is thin because the light incident surface and the light emitting surface are formed substantially parallel to each other. In other words, a thinner collimating lens is assembled into the vehicle display. Thereby, a more compact vehicle display device can be provided.

In the invention according to claim 5 , the correcting member is a liquid crystal polymer lens or a lenticular lens in which a light incident surface and a light emitting surface are formed substantially parallel to each other. Since the light incident surface and the light emitting surface are formed substantially parallel to each other, the thickness of the correction member is reduced. That is, a thinner correction member is assembled to the vehicle display device. Thereby, a more compact vehicle display device can be provided.

In the invention according to claim 6 , the correcting member is arranged such that the light incident surface and the light emitting surface are parallel to the first surface. By arranging these surfaces parallel to the first surface, the correction member and the light guide are arranged parallel to each other. Assuming that the correction member and the light guide are integrated, the correction member and the light guide are arranged in parallel and thus compact. As a result, the case that accommodates the correction member and the light guide can be made more compact. As a result, a more compact vehicle display device can be provided.

1 is a cross-sectional view of a vehicle display device according to Embodiment 1 of the present invention, viewed from the side of a vehicle body; 2 is a cross-sectional view taken along line 2-2 of FIG. 1; FIG. FIG. 2 is a diagram for explaining the operation of the vehicle display device shown in FIG. 1; 2A and 2B are diagrams for explaining actions of a first external light shielding portion and a second external light shielding portion shown in FIG. 1; FIG. FIG. 3 shows a modification of the light guide shown in FIG. 2; FIG. 10 is a cross-sectional view of a vehicle display device according to Example 2; FIG. 11 is a cross-sectional view of a vehicle display device according to Example 3; It is a figure explaining the problem at the time of mounting the conventional display apparatus for vehicles on a vehicle.

An embodiment of the present invention will be described below with reference to the accompanying drawings. In the description, left and right refer to left and right with respect to the occupant of the vehicle, and front and rear refer to front and rear with respect to the traveling direction of the vehicle. In the figure, Fr indicates the front, Rr the rear, Le the left as seen from the occupant, Ri the right as seen from the occupant, Up the upper, and Dn the lower.
<Example 1>

Please refer to FIG. The vehicle display device 20 projects light onto the windshield 11 (screen unit 11 ) to make the driver Mn recognize that an image is projected in front of the windshield 11 . By including information such as vehicle speed and navigation information in the image, the driver Mn can obtain necessary information through the windshield 11 during driving.

The vehicular display device 20 is housed in a dashboard 12 (storage section 12 ) provided in the front portion of the vehicle body 10 . The dashboard 12 is provided with a shielding portion (hereinafter referred to as a “second external light shielding portion 12a”) that protrudes toward the windshield 11 and has a light shielding property. The vehicle display device 20 is housed at a position below the second external light shielding portion 12 a and emits light toward the windshield 11 .

By the way, the vehicle display device 20 housed in the front part of the vehicle body 10 may be irradiated with sunlight incident on the inside of the vehicle through the windshield 11, for example. Such sunlight can be said to be external light that irradiates the vehicle display device 20 from the outside (outside the vehicle display device 20). External light that irradiates the vehicle display device 20 may enter the light guide 50 and the correction member 60 through an opening 32b, which will be described later. In such a case, external light may be reflected toward the windshield 11 by the light guide 50 and the correction member 60 .

Please refer to FIG. The vehicle display device 20 includes a box-shaped case 30, a display means 21 fixed to the case 30, a collimating optical system 40 for collimating the light emitted from the displaying means 21, and the collimating optical system. A light guide 50 into which light that has passed through the system 40 is incident, a correction member 60 that corrects the traveling direction of the light emitted from the light guide 50, and a control unit 22 that controls the display means 21. have.

Please refer to FIG. A case 30 housed in the dashboard 12 comprises a resin lower case 31, a resin upper case 32 covering the lower case 31, and a transparent cover 33 provided on the upper case. .

Also refer to FIG. The case 30 is accommodated at a position below the second external light shielding portion 12a having light shielding properties. The case 30 is continuous with the second external light shielding portion 12a, and is tilted so that the cover 33 faces the second external light shielding portion 12a. Here, the second external light shielding portion 12 a protrudes toward the optical path of the external light reflected by the light guide 50 and the correction member 60 . The display unit 21, the collimating optical system 40, the light guide 50, and the correction member 60 are accommodated in the case 30. As shown in FIG.

Please refer to FIG. The lower case 31 is made of a light-blocking resin, and blocks light entering from the outside. The lower case 31 is arranged in front of the vehicle body 10 relative to the upper case 32 .

The upper case 32 includes an upper case main body 32a made of resin having a light-shielding property, an opening 32b provided in the upper case main body 32a through which the light corrected by the correction member 60 passes, and the vicinity of the opening 32b. and a first external light shielding portion 32c that is provided in the upper case body portion 32a and protrudes toward the windshield 11 from the upper case main body portion 32a. The upper case 32 is arranged behind the vehicle body 10 relative to the lower case 31 .

The upper case main body portion 32a blocks light incident from the outside.

The first external light shielding portion 32 c protrudes toward the optical path of external light reflected by the light guide 50 and the correction member 60 . The first external light shielding portion 32 c is made of resin having a light blocking property, and suppresses external light reflected by the light guide 50 and the correction member 60 from being projected onto the windshield 11 . The tip of the first external light shielding portion 32c abuts on the second external light shielding portion 12a. The first external light shielding portion 32c is continuous with the second external light shielding portion 12a.

Please refer to FIG. The display means 21 has a light source 21a capable of emitting light and a display panel 21b through which the light emitted from the light source 21a is transmitted.

The light source 21a is formed by mounting an LED lamp on a substrate. Note that the light source 21a is not limited to an LED lamp as long as it can irradiate the display panel 21b with light.

The display panel 21b employs, for example, a transmissive display element such as a TFT (Thin Film Transistor) liquid crystal panel.

The collimating optical system 40 includes a first mirror 41 that reflects the light emitted from the display means 21, a second mirror 42 that reflects the light reflected by the first mirror 41, and the second mirror and a collimating lens 43 through which the reflected light passes.

The first mirror 41 is a full mirror composed of a first mirror substrate 41a having a flat plate shape and a first mirror reflecting portion 41b deposited in a thin film on the surface of the first mirror substrate 41a. be.

The first mirror base material 41a is made of inorganic glass, for example.

The first mirror reflecting portion 41 b is arranged on the optical path of the light emitted from the display means 21 and reflects the light toward the second mirror 42 . The first mirror reflecting portion 41b is a portion on which metal such as aluminum is vapor-deposited in the form of a thin film. For example, silver or the like can be used as the metal forming the first mirror reflection portion 41b.

The second mirror 42 is a full mirror composed of a second mirror substrate 42a having a flat plate shape and a second mirror reflecting portion 42b deposited in the form of a thin film on the surface of the second mirror substrate 42a. be.

The second mirror base material 42a is made of inorganic glass, for example.

The second mirror reflector 42 b is arranged on the optical path of the light reflected by the first mirror reflector 41 b and reflects the light toward the collimator lens 43 . The second mirror reflection portion 42b is a portion on which a thin film of metal such as aluminum is vapor-deposited. For example, silver or the like can be used as the metal forming the second mirror reflection portion 42b.

The collimating lens 43 is arranged on the optical path of the light reflected by the second mirror reflecting portion 42b, and makes the light passing through the collimating lens 43 parallel. The collimator lens 43 has a light incident surface and a light exit surface that are substantially parallel to each other. A liquid crystal polymer lens or a lenticular lens can be adopted for the collimator lens 43 formed substantially in parallel. A lens made of inorganic glass can be used for the polymer lens and the lenticular lens.

The first mirror 41 , the second mirror 42 and the collimating lens 43 are arranged so that the light that has passed through the collimating optical system 40 and entered the light guide 50 is totally reflected inside the light guide 50 . That is, the light passing through the collimating optical system 40 and incident on the light guide 50 is incident on the inner surface of the light guide 50 at an angle larger than the critical angle (the minimum angle at which the incident light is totally reflected). are arranged to

The light guide 50 has a light guide entrance surface 51 on which light that has passed through the collimator lens 43 is incident, and a first surface that totally reflects the light that has entered the light guide 50 from the light guide entrance surface 51 . 52, a light guide facing surface 53 which faces the first surface 52 and receives the light reflected by the first surface 52; A deflecting portion 54 that diffracts part of the light incident on the surface 53, and a second surface 55 that is formed below the deflecting portion 54 and totally reflects the remaining light incident on the light guide facing surface 53. contains.

The light guide entrance surface 51 is arranged in the vicinity of the collimator lens 43 and is incident on the light that has passed through the collimator lens 43 . The light that has passed through the collimator lens 43 enters the light guide 50 through the light guide entrance surface 51 . The light guide entrance surface 51 connects the ends of the first surface 52 and the light guide facing surface 53 . The light guide entrance surface 51 is inclined with respect to the collimator lens 43 .

The first surface 52 is arranged along the vehicle width direction of the vehicle body 10 . The first surface 52 is a boundary surface where the light that has entered the light guide entrance surface 51 and passed through the light guide entrance surface 51 first reaches. The light passing through the incident surface 51 of the light guide enters the first surface 52 at an angle larger than the critical angle, and is totally reflected by the first surface 52 toward the deflection section 54 . Also, the first surface 52 totally reflects the light totally reflected by the second surface 55 toward the second surface 55 .

The light guide facing surface 53 is formed parallel to the first surface 52 and positioned between the first surface 52 and the second surface 55 .

Also refer to FIG. The deflecting portion 54 diffracts part of the light incident on the deflecting portion 54 so that the light reflected inside the light guide 50 is emitted to the outside from the first surface 52 . Further, the deflector 54 directs incident light toward the windshield 11 so that the light emitted from the first surface 52 avoids the first external light shielding portion 32c and the second external light shielding portion 12a. diffract. The deflection unit 54 is composed of, for example, a holographic optical element, and is laminated with thin films capable of diffracting light in a predetermined wavelength band. The deflection section 54 diffracts the light incident on the deflection section 54 according to the wavelength band, and transmits the remaining light. In addition to the holographic optical element, for example, a black diffraction grating, a liquid crystal polymer diffraction grating, or a blazed diffraction optical element can be used for the deflection section 54 .

Please refer to FIG. The second surface 55 is a boundary surface formed in the lower portion of the deflection section 54 and totally reflects incident light toward the first surface 52 . The second surface 55 is parallel to the first surface 52 and extends along the vehicle width direction together with the first surface 52 . The light reflected by the first surface 52 is incident on the second surface 55 at an angle larger than the critical angle.

Also refer to FIG. The first surface 52 and the second surface 55 block external light that passes through the opening 32b and is incident on the first surface 52 and the second surface 55 through the first external light shielding portion 32c and the second external light shielding portion 32c. It is inclined toward the first external light shielding portion 32c and the second external light shielding portion 12a so as to reflect toward the shielding portion 12a.

Please refer to FIG. The correction member 60 has a member entrance surface 61 on which light emitted from the first surface 52 is incident, and a member exit surface 62 from which the light incident from the member entrance surface 61 is emitted.

The correction member 60 is a transmissive lens, and refracts incident light so that the light reflected by the windshield 11 becomes parallel light. For the correction member 60, for example, a liquid crystal polymer lens or a lenticular lens can be adopted. A lens made of inorganic glass can be used for the polymer lens and the lenticular lens.

Also refer to FIG. The member entrance surface 61 and the member exit surface 62 are formed substantially parallel to each other. Furthermore, the member entrance surface 61 and the member exit surface 62 block external light that passes through the opening 32b and enters the member entrance surface 61 and the member exit surface 62 through the first external light shielding portion 32c and the second external light shielding portion. It is inclined toward the first external light shielding portion 32c and the second external light shielding portion 12a so as to reflect toward 12a.

The first surface 52, the second surface 55, the member entrance surface 61, and the member exit surface 62 are provided substantially parallel to each other.

The control unit 22 controls blinking of the light source 21a. An arbitrary image I is projected in front of the windshield 11 by voltage-controlling the display panel 21 b by the control unit 22 .

Next, the operation of the vehicle display device will be described.

Please refer to FIG. The vehicle display device 20 is housed, for example, in the dashboard 12 of the vehicle 10 and projects light onto the windshield 11 . By projecting light onto the windshield 11 , the driver Mn recognizes that an arbitrary image I is projected in front of the windshield 11 .

Please refer to FIG. FIG. 3 shows the vehicle display device 20 and the optical path of the light that is projected onto the windshield 11 so that the user recognizes that an image is being projected. Light projected onto the windshield 11 is emitted from the display means 21 . The optical path of the light emitted from the display means 21 until it is projected onto the windshield 11 will be described below.

Light emitted from the display means 21 is reflected by the first mirror 41 and the second mirror 42, passes through the collimator lens 43, and becomes parallel light. The parallel light enters the interior of the light guide 50 from the light guide entrance surface 51 and reaches (enters) the first surface 52 . Here, the angle of incidence of light on the first surface 52 is larger than the critical angle when the minimum angle at which light is totally reflected is defined as the critical angle. That is, the incident angle θ>critical angle γ (the critical angle γ is not shown). Therefore, light incident on the first surface 52 is totally reflected toward the second surface 55 provided parallel to the first surface 52 . The light totally reflected toward the second surface 55 enters the deflection section 54 via the light guide facing surface 53 .

Some of the light incident on the deflection section 54 is diffracted by the deflection section 54 . The deflection portion 54 emits light from the first surface 52 to the outside of the light guide 50, and the emitted light passes through the first external light shielding portion 32c (see FIG. 1) and the second external light shielding portion 12a. (See FIG. 1) and is diffracted so as to be projected onto the windshield 11 . Therefore, part of the diffracted light is emitted from the first surface 52 , transmitted through the correcting member 60 which is a transmissive lens, and projected onto the windshield 11 .

The rest of the light incident on the deflection section 54 enters the second surface 55 formed below the deflection section 54 . At this time, the incident angle of the remaining light incident on the second surface 55 is larger than the critical angle, where the minimum angle at which light is totally reflected is defined as the critical angle. That is, the incident angle δ>critical angle γ. Therefore, light incident on the second surface 55 is totally reflected toward the first surface 52 . The light totally reflected toward the first surface 52 enters the first surface 52 via the light guide facing surface 53 . The incident angle at this time is larger than the critical angle. That is, the incident angle θ>critical angle γ.

Next, the operation of the first external light shielding section and the second external light shielding section will be described.

Please refer to FIGS. 4(a) and 4(b). FIGS. 4(a) and 4(b) show a vehicle display device 220 in which the first external light shielding section and the second external light shielding section are not provided. The vehicle display device 220 projects the light emitted from the first surface 252 of the light guide 250 onto the windshield 211 . In such a vehicle display device 220 , external light entering the light guide 250 and the correction member 260 from the outside may be reflected toward the windshield 211 and projected onto the windshield 211 . It should be noted that the first surface 252 , the second surface 255 , the member entrance surface 261 and the member exit surface 262 are the parts that cause the light incident on the light guide 250 and the correction member 260 to be reflected.

Please refer to FIGS. 4(c) and 4(d). 4(c) and 4(d) show the vehicle display device 20 provided with the first external light shielding portion 32c and the second external light shielding portion 12a. The light guide 50 has a first surface 52 and a second surface 55 inclined toward the first external light shielding portion 32c and the second external light shielding portion 12a. The correcting member 60 has a member entrance surface 61 and a member exit surface 62 inclined toward the first external light shielding portion 32c and the second external light shielding portion 12a. As a result, external light reflected by the light guide 50 and the correction member 60 can be blocked by the first external light shielding portion 32c and the second external light shielding portion 12a. Furthermore, the light guide 50 emits light from the first surface 52 so as to avoid the first external light shielding portion 32c and the second external light shielding portion 12a. Therefore, the light emitted from the light guide 50 can be projected onto the windshield 11 while suppressing the projection of external light onto the windshield 11 .

Next, the effects of the vehicle display device will be described.

Please refer to FIG. In the vehicle display device 20, the light guide body 50 includes a first surface 52 and a second surface 55 formed parallel to each other and extending along the vehicle width direction, and diffracts or reflects light passing through the inside. and a deflecting portion 54 that emits light from one surface 52 . Since the light guide 50 has the deflector 54 that diffracts or reflects the light passing through it and is emitted from the first surface 52, regardless of how the light guide 50 is arranged, the first light can be emitted from the surface 52 of . In other words, the light can be emitted from the first surface 52 without tilting the light guide 50 in the longitudinal direction of the vehicle body 10 . Furthermore, since the first surface 52 and the second surface 55 constituting the light guide 50 extend along the vehicle width direction of the vehicle body 10, the light guide 50 is provided parallel to the vehicle width direction. be done. That is, it is possible to prevent the light guide 50 from tilting forward and backward. As a result, a compact vehicle display device 20 can be provided.

Please refer to FIG. In addition, the case 30 housing the light guide 50 protrudes toward the optical path of the light incident on the light guide 50 from the outside and reflected toward the screen portion 11 , and the reflected light is projected onto the screen portion 11 . It has a first external light shielding portion 32c that suppresses the light from being exposed. Since the case 30 has the first external light shielding portion 32c, external light that enters the light guide 50 from the outside and is reflected by the light guide 50 is blocked by the first external light shielding portion 32c. be done. As a result, it is possible to prevent the external light reflected by the light guide 50 from being projected onto the screen section 11 . As a result, it is possible to suppress the occurrence of a situation in which the projected image I becomes difficult to see due to the projection of the external light incident on the vehicle display device 20 onto the screen portion 11 . That is, the virtual image I can be easily recognized.

The housing portion 12 formed in the front portion of the vehicle body 10 protrudes toward the optical path of the light that enters the light guide 50 from the outside and is reflected toward the screen portion 11 , and the reflected light is projected onto the screen portion 11 . 2nd outside light shielding part 12a which suppresses this is included. By adopting a configuration in which external light is blocked by the first external light shielding portion 32c and the second external light shielding portion 12a, the external light reflected by the light guide 50 can be blocked more reliably. As a result, it is possible to further suppress the occurrence of a situation in which the projected image I becomes difficult to see. That is, the virtual image I can be made easier to recognize.

The correcting member 60 reflects light that has entered the case toward the first external light shielding portion 32c. As a result, it is possible to prevent the external light reflected by the correction member 60 from being projected onto the screen portion 11 . As a result, it is possible to further suppress the occurrence of a situation in which the projected image I becomes difficult to see due to the projection of the external light incident on the vehicle display device 20 onto the screen portion 11 . That is, the virtual image I can be made easier to recognize.

Please refer to FIG. The incident angle of the light that has passed through the collimating optical system 40 and is incident on the first surface 52 and the second surface 55 of the light guide 50 is such that the light incident on the first surface 52 and the second surface 55 is totally reflected. It is an angle larger than the critical angle, which is the minimum angle for By setting the incident angle of the light to the first surface 52 and the second surface 55 to be larger than the critical angle, the light incident on the first surface 52 and the second surface 55 is totally reflected. . As a result, the light incident on the light guide 50 can be reflected inside the light guide 50 without loss of light energy. As a result, it becomes unnecessary to form a reflective film for reflecting light on the first surface 52 or the second surface 55 in order to increase the reflectance. This makes it possible to provide the inexpensive vehicle display device 20 .

The collimating optical system 40 has a collimating lens 43 that transmits light so that the light enters the first surface 52 . The collimator lens 43 is a liquid crystal polymer lens or a lenticular lens in which a light incident surface and a light exit surface are formed substantially parallel to each other. The collimating lens is thin because the light incident surface and the light emitting surface are formed substantially parallel to each other. In other words, a thinner collimating lens is assembled to the vehicle display device 20 . Thereby, a more compact vehicle display device 20 can be provided.

The correcting member 60 is a liquid crystal polymer lens or a lenticular lens in which a light incident surface and a light exit surface are formed substantially parallel to each other. Since the light incident surface and the light emitting surface are formed substantially parallel to each other, the thickness of the correction member 60 is reduced. In other words, a thinner correction member 60 is assembled to the vehicle display device 20 . Thereby, a more compact vehicle display device 20 can be provided.

The correction member 60 is arranged such that a light incident surface (member entrance surface) 61 and a light exit surface (member exit surface) 62 are parallel to the first surface 52 . By arranging these surfaces 61 and 62 parallel to the first surface 52, the correction member 60 and the light guide 50 are arranged parallel to each other. Assuming that the correction member 60 and the light guide 50 are integrated, the correction member 60 and the light guide 50 are arranged in parallel and thus compact. Thereby, the case 30 that accommodates the correction member 60 and the light guide 50 can be made more compact. As a result, a more compact vehicle display device 20 can be provided.

Next, a modified example of the vehicle display device will be described.

Please refer to FIG. FIG. 5 shows a light guide 50A mounted on a vehicle display device 20A according to a modification. The light guide 50A is integrally provided with a collimator lens portion 56A that plays a role of converting transmitted light into parallel light. That is, it can be said that the vehicle display device 20A has the collimator lens 43 integrally provided with the light guide 50 shown in FIG.

The light guide body 50A configured in this manner can also provide the desired effects of the present invention. Furthermore, by using the light guide body 50A integrally formed with the collimating lens portion 56A, the number of parts can be reduced.
<Example 2>

Next, a vehicle display device according to a second embodiment of the present invention will be described with reference to the drawings.

Please refer to FIG. FIG. 6 shows a cross-sectional view of a vehicle display device 20B according to the second embodiment, corresponding to FIG. Reference numerals are used for the parts that are common to the first embodiment, and detailed description thereof is omitted.

The light guide 50B includes a light guide entrance surface 51 on which light that has passed through the collimator lens 43 is incident, a first surface 52 that totally reflects the light that has entered from the light guide entrance surface 51, and the first surface 52. It consists of a deflection portion 54B that reflects part of the light reflected by the surface 52 and transmits the rest, and a second surface 55 that totally reflects the light transmitted through the deflection portion 54B toward the first surface 52. .

A plurality of deflecting portions 54B are arranged in a tilted state inside the light guide 50B so that a portion of the reflected light is emitted outward from the first surface 52 . The light reflected by the deflecting portion 54B tilted in this way avoids the first external light shielding portion 32c (see FIG. 1) and the second external light shielding portion 12a (see FIG. 2) and is projected onto the windshield 11. be done. The deflector 54</b>B is, for example, a half mirror, and is provided between the first surface 52 and the second surface 55 . A half mirror here means a mirror that can partially reflect light. That is, the ratio of light reflectance and light transmittance does not necessarily have to be 1:1. For example, the ratio may be 1:9 or 2:8. Furthermore, the plurality of deflection sections 54B may have different reflectances and transmittances.

The predetermined effects of the present invention can also be obtained in the vehicle display device 20B according to the second embodiment.
<Example 3>

Next, a vehicle display device according to a third embodiment of the present invention will be described with reference to the drawings.

Please refer to FIG. FIG. 7 shows a cross-sectional view of a vehicle display device 20C according to the third embodiment, corresponding to FIG. In the vehicle display device 20C of Example 3, the cover 33 of Example 1 is eliminated, and a correction member 60C is attached to the portion where the cover 33 was attached. Other basic structures are the same as those of the vehicle display device 20 of the first embodiment. Reference numerals are used for the parts that are common to the first embodiment, and detailed description thereof is omitted.

The case 30</b>C is composed of a resin lower case 31 and a resin upper case 32 covering the lower case 31 .

The correction member 60C has a first external light shielding structure so as to reflect external light incident on the member entrance surface 61 and the member exit surface 62 toward the first external light shielding portion 32c and the second external light shielding portion 12a. It is attached to the opening 32b formed in the upper case 32 while being inclined toward the portion 32c and the second external light shielding portion 12a. The correction member 60C also serves as the cover 33 (see FIG. 2) in the first embodiment to prevent dust from entering the case 30C. The correction member 60</b>C is arranged such that the member entrance surface 61 and the member exit surface 62 are parallel to the first surface 52 and the second surface 55 .

The predetermined effects of the present invention can also be obtained in the vehicle display device 20C according to the third embodiment.

The vehicle on which the vehicle display device according to the present invention is mounted may be a two-wheeled vehicle or a three-wheeled vehicle in addition to the four-wheeled vehicle.

Also, the first and second mirrors shown in the embodiment are not essential components. In other words, these may be discarded if necessary. Conversely, the number of mirrors can be increased as needed. By increasing the number of mirrors, it is possible to increase the degree of freedom of the optical path until the light enters the light guide.

Furthermore, in the embodiment, an example has been described in which the external light reflected by the light guide is blocked by the first external light shielding portion and the second external light shielding portion. However, the vehicular display device may block external light reflected by the light guide only by the first external light shielding portion. In order to block only the first external light shielding part, for example, the light guide may be tilted toward the first external light shielding part side, or the first external light shielding part may be directed toward the optical path of the reflected external light. You may make it protrude more.

Moreover, in the embodiment, an example has been described in which the correction member reflects the outside light entering the case toward the first outside light shielding portion and the second outside light shielding portion. However, the correction member may reflect incident external light toward the first external light shielding portion or the second external light shielding portion. That is, the external light reflected by the correction member may be blocked only by the first external light shielding portion, or the external light reflected by the correction member may be blocked by only the second external light shielding portion. Also good.

Furthermore, in the examples, the screen portion is described as a windshield. However, the vehicular display device according to the present invention can also be applied to a vehicular display device using a so-called combiner as a screen portion.

That is, the present invention is not limited to the examples as long as the action and effects of the present invention are exhibited.

The vehicle display device of the present invention is suitable for being mounted on a vehicle.

10... vehicle (body)
11... Screen part (front glass)
12 ... Storage part (dashboard)
DESCRIPTION OF SYMBOLS 12a... 2nd external light shielding part 20, 20A, 20B, 20C... Vehicle display device 21... Display means 30, 30C... Case 32c... 1st external light shielding part 40... Collimating optical system 43... Collimating lens 50, 50A, 50B... Light guide 52... First surface 54, 54B... Deflection unit 55... Second surface 60, 60C... Correction member Mn... Driver

Claims (6)

The case is stored in the storage section formed in the front part of the vehicle body,
In the case, display means capable of emitting light, a collimating optical system provided on the optical path of the light emitted from the display means and collimating the light emitted from the display means, and the collimating optical system A light guide member in which the light that passes through the light guide member is incident and the incident light travels by reflecting the inside of the light guide member, and a correction member that corrects the direction in which the light emitted from the light guide member is incident and the incident light is accommodated. ,
A vehicular display device in which light that has passed through the correction member is projected onto a screen unit,
The case protrudes toward an optical path of light incident on the light guide from the outside and reflected toward the screen portion, and suppresses the reflected light from being projected onto the screen portion. including a shielding part,
the correction member is arranged to reflect light incident into the case toward the first external light shielding portion;
The light guide has a first surface and a second surface formed parallel to each other and extending along the vehicle width direction, and diffracts or reflects light passing through the interior to avoid the first external light shielding portion. and a deflecting portion for emitting light from the first surface toward the screen portion, the vehicular display device being arranged in parallel with the correcting member . The storage portion protrudes toward an optical path of light incident on the light guide from the outside and reflected toward the screen portion, and prevents the reflected light from being projected onto the screen portion. 2. The vehicle display device according to claim 1, further comprising a light shielding portion. The incident angle of the light that passes through the collimating optical system and is incident on the first surface and the second surface of the light guide is such that the light incident on the first surface and the second surface is totally reflected. 3. The vehicle display device according to claim 1, wherein the angle is larger than the critical angle, which is the minimum angle to be set. The collimating optical system has a collimating lens that transmits light so that the light is incident on the first surface,
The vehicle according to any one of claims 1 to 3 , wherein the collimating lens is a liquid crystal polymer lens or a lenticular lens having a light incident surface and a light emitting surface substantially parallel to each other. display device for The vehicle according to any one of claims 1 to 4 , wherein the correcting member is a liquid crystal polymer lens or a lenticular lens having a light incident surface and a light emitting surface substantially parallel to each other. display device for The correction member according to any one of claims 1 to 5 , wherein the correction member is arranged such that a light incident surface and a light emitting surface are parallel to the first surface. Vehicle display.

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