JP2001282132A - Head up display device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To downsize a head up display device unit and to enhance the display luminance of hologram virtual images. SOLUTION: The head up display device unit having a reflection plate for reconstructing and displaying the hologram virtual images and a liquid crystal display for reflecting and displaying the display images by the display to the reflection plate is separately provided with a reference light source for reconstructing and displaying the virtual images and a translucent light source for causing the luminous display of the liquid crystal display. An LED is used as the reference light source.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head-up display device for projecting and reflecting a display image of a display device on a porous reflector disposed in front of a driver's seat of an automobile, for example. The present invention relates to a head-up display device for a vehicle configured to be able to reduce the size of a display device unit and increase the display brightness of a hologram virtual image.

[0002]

2. Description of the Related Art For example, a vehicular head-up display device for displaying different information at the same position of a porous reflective plate disposed in front of a driver's seat of an automobile by using regular reflection and non-regular reflection by a hologram is known. Kaihei 10-9524
No. 7 discloses this. The head-up display device for a vehicle includes a non-specular reflection hologram mirror that non-specularly reflects light from one of two displays arranged at different positions in a predetermined optical axis direction, and A semi-transmissive reflector that reflects light from the display device in the direction of the reflection optical axis of the non-specular reflection hologram mirror and is disposed in front of the non-specular reflection hologram mirror in the reflection direction.
Each light from the two displays is reflected in the same optical axis direction by the non-specular reflection hologram and the reflector, so that the display images of the two displays can be visually recognized within the same display range from the same optical axis direction. It was done.

The configuration of a vehicle head-up display device shown in this conventional example is shown in FIG.
Explaining the outline of the configuration, the reflector 1 is a transflective reflector having a hologram surface 11 for presenting a hologram image. The light source 3 is a light source composed of a halogen bulb. The spheroid mirror 5 is a mirror surface composed of a part of an elliptical shape, and is set so that one focal point on the ellipse is located at the position of the light source 3 and the other focal point is located at the position of the pinhole 7.

[0004] The movable reflecting mirror 9 is movably installed at the connecting portion 19 via the supporting portion 17 and reflects the light passing through the pinhole 7 to the reflecting plate 1 when in the open position as shown in FIG. On the other hand, when it is at the shielding position 9 ', the light passing through the pinhole 7 is shielded. Hologram surface 1
1 has a hologram for pre-recording information on the end of the vehicle,
The hologram image, which is a virtual image, is reproduced by the driver on the eye range 21 so as to be visually recognized by the light from the light source 3 reflected by the movable reflecting mirror 9.

The liquid crystal screen 13 displays the latest vehicle information. The liquid crystal screen 13 transmits the light from the light source 3 reflected by the rotating parabolic mirror 15 and reflects the latest vehicle information on the reflecting mirror.
The latest vehicle information image is displayed so as to be visible to the driver on the eye range 12. A diffusion plate 71 is provided on the lower surface of the liquid crystal screen 13 so that uniform light is incident on the liquid crystal screen 13. In order to facilitate understanding of the present invention, the principle of the hologram will be briefly described with reference to FIG.

That is, the laser beam 21 is transmitted to the transflective mirror 2.
2. When the laser light 21 is incident on the convex lens 24 via the reflecting mirror 23, the laser light 21 emitted from the lens 24 irradiates the entire surface of the object 25. On the other hand, when the laser light 21 is made incident on the convex lens 28 via the semi-transmissive reflecting mirror 22, the reflecting mirror 26 and the reflecting mirror 27, the reference light 29 emitted from the lens 28 irradiates the entire hologram recording surface 30. Is done.

Here, when the laser beam 21 is applied to the object 25, the reflected light 20 reflected from the object 25 is reflected.
And the interference fringes generated by the laser light 21 and the reference light 29 are recorded on the hologram recording surface 30. Next, when the hologram recording surface 30 is irradiated with the reference light 29, the object light is reproduced from the hologram recording surface 30. The position of the object recorded on the hologram recording surface 30 is recorded at a position where the hologram image can be seen at a preset position when the driver views the reproduced hologram image. The hologram recording surface 30 recorded in this way is attached to the transflective portion of the reflector 1.

[0008]

However, in the vehicular head-up display device having the above structure, the light emitted from the light source 3 is transmitted through a mirror having a complicated shape forming the spheroid mirror 5 and the paraboloid mirror 15. 3 is reflected by the reflecting plate 1 (combiner) via the movable reflecting mirror 9 and the liquid crystal screen 13 is transmitted and illuminated with the light of the other part. Insufficient luminance occurs when the reflection illumination of the reflector 1 and the transmission illumination of the liquid crystal screen 13 are performed. If the size of the light source is increased, the display illumination brightness can be improved. However, increasing the size of the light source causes a problem that the unit shape of the head-up display device for a vehicle is increased.

In a conventional head-up display device for a vehicle, a spheroidal mirror 5 and a paraboloidal mirror 15 having specific shapes are provided in a unit case of the head-up display device, and light from the light source 3 is transmitted. Since the spheroidal mirror 5 reflects the light toward the liquid crystal screen 13 and the paraboloidal mirror 15 reflects the light toward the movable reflecting mirror 9, the spheroidal surface having the specific shape is provided in the unit case. A depth space is required to house the mirror 5 and the rotating parabolic mirror 15, and this also causes a problem that the unit shape of the head-up display device becomes large.

Further, in the conventional example, since a halogen bulb is used as the light source 3, the wavelength characteristic of the halogen bulb and the wavelength characteristic of the laser beam used as the reference light are greatly different. The reproduction brightness of the image was insufficient, and it was impossible to display a hologram image with high brightness.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems in the conventional head-up display device. The head-up display device has a reduced unit shape, and the head-up display device is mounted in a small space limited in a vehicle interior. A first object is to facilitate equipment of an up display device.

According to the present invention, a light source having a light wavelength characteristic of a light source incorporated in a head-up display device unit which is similar to a light wavelength characteristic of a laser beam is used to improve the reproduction brightness of a hologram image and reduce the size of the light source. A second object is to develop a light source that can reflect and illuminate a combiner with sufficient luminance even when the light source is used.

[0013]

In order to achieve the first and second objects, according to the first aspect of the present invention, a transmission / reflection plate provided with a hologram for reproducing and displaying a hologram image; In a vehicle head-up display device having a reference light source for reproducing and displaying, an LED is used as the reference light source, the light of the LED is condensed on an aperture via a condenser lens, and the condensed light is irradiated on a reflector. It is a head-up display device for a vehicle.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

FIG. 1 shows the structure of a head-up display device for a vehicle, 31 denotes a lower housing of the head-up display device for a vehicle, 32 denotes an upper housing thereof, and a horizontal support shaft 33 is mounted on the upper housing 32. The support shaft is supported by a bracket 34. A translucent combiner 36 is attached to the bracket 34 by an attachment screw 35, and is provided so as to be able to undulate with the bracket 34 and a horizontal support shaft 33 as a fulcrum.

A liquid crystal display 38 transmitted and illuminated by a backlight 37 and a light source 39 for generating reference light are built in a housing composed of the lower housing 31 and the upper housing 32. The display image by the liquid crystal display 38 is projected through a display window 40 provided on the upper surface of the upper housing 32 toward the surface of the combiner 36 which is erected upright.

The reference light source 39 houses an LED 43 serving as a light source inside a light source case 42 having an aperture 41, and the LED 43 and the aperture 4.
A condensing lens 44 is arranged in the middle of the optical path connecting the lens 1 and the lens 1. The position of the condenser lens is set such that the center of the aperture 41 is located at the focal position of the condenser lens.

Reference numeral 45 denotes a mounting bracket screwed to the inner surface of the lower housing 31. The light source case 42 of the light source 39 is positioned by the mounting bracket 45, and at the same time, the reference light emitted from the light source 39. A reflecting mirror 46 for reflecting the light to the surface of the combiner 36 is held.

Reference numeral 47 denotes a backlight inverter, 4
Reference numeral 8 denotes an instrument panel for fixing and holding the vehicle head-up display device having the above-described configuration. The raising and lowering operation of the combiner 36 can be performed manually or electrically by a known means.

The configuration of the present embodiment has been described above. The operation of the liquid crystal display 38 will be described below. The liquid crystal display 38 can display vehicle information necessary for the operation of the vehicle. Is reflected on the surface of the combiner 36 by turning on the backlight 38, and the reflected display information is visible to the driver in the eye range.

At a predetermined position on the surface of the combiner,
For example, since a hologram image in the form of a corner pole of a vehicle is recorded in advance, by irradiating the hologram image with reference light emitted from the light source 39 through the reflecting mirror 46, the hologram image is reproduced on the surface of the combiner. Is done. Therefore, the driver can see both the display by the liquid crystal display 38 and the hologram image reproduced by the reference light on the surface of the combiner 36.

In the present embodiment, the light source 39 of the reference light for reproducing and displaying the hologram image is a single light source provided separately from the backlight for transmitting and illuminating the liquid crystal display 38. The light source can be configured as a light source having sufficient luminance to reproduce and display an image.
Since the ED is used, it is possible to obtain, from the LED, a wavelength characteristic approximate to the wavelength characteristic of a laser beam effective as reference light for reproducing and displaying a hologram image, so that the display of the hologram image is reproduced effectively and clearly. be able to.

Further, since an LED is used as a light source used for reproducing and displaying the hologram image, the size of the light source can be reduced, and light emitted from the LED is reflected on the surface of the combiner 36. Since it is possible to simplify the reflection path and the configuration of the reflection plate, the size and economy of the head-up display device unit for a vehicle can be improved.

In the above embodiment, the light source used as the reference light is constituted by one LED 43. However, when the light source luminance is insufficient, a plurality of LEDs can be used in combination. . As an embodiment in the case of using a plurality of LEDs 43 in combination, as shown in FIG.
And the aperture axis of the aperture 41 is arranged so that the optical axis of the aperture 43 is parallel to the aperture axis of the aperture 41, the light emitted from each LED 43 is transmitted between the LED 43 and the aperture 41 so as to be condensed at the position of the aperture 41. The condenser lens 44 </ b> A may be provided. When the optical axes of the plurality of LEDs 43 and the aperture axes of the aperture 41 intersect as shown in FIG. LED
What is necessary is just to arrange | position the reflection condensing lens 44B which reflects the light emission from 43 toward the aperture 41, and condenses it. As shown in FIG. 4, when the two LEDs 43 are opposed to each other, a reflection condenser lens 44 </ b> C for reflecting and condensing light emitted from the LEDs 43 in the direction of the aperture 41 is arranged between the two LEDs 43. I do.

Therefore, according to each of the above embodiments, it is possible to increase the luminance of the reference light for reproducing and displaying the hologram virtual image. In addition, since each uses an LED as a light source, the wavelength characteristic of the laser light is reduced. Since the hologram virtual image can be reproduced and displayed with close wavelength characteristics, the hologram virtual image is clearly displayed.

[0026]

As described above, according to the head-up display device for a vehicle according to the first aspect of the present invention, an LED having a wavelength characteristic close to that of a laser beam as a light source for reproducing and displaying a hologram virtual image. Is used, the display of the hologram virtual image can be made effective and clear. In addition, the use of an LED as a light source makes it possible to reduce the unit size, thereby providing a small head-up display device.

Further, by using a plurality of LEDs, it is possible to increase the luminance of the reference light, thereby increasing the display luminance of the hologram virtual image.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view showing an embodiment of a head-up display device according to the present invention.

FIG. 2 is a perspective view of a light source using three LEDs in each embodiment of a light source used in a head-up display device according to the present invention, and (b) is a plan view thereof.

FIG. 3 is a view showing each embodiment of a light source used in the head-up display device according to the present invention, wherein the light source is arranged so that the optical axis of three LEDs intersects the hole axis of the aperture. () Is a perspective view thereof, and (b) is a plan view thereof.

FIGS. 4A and 4B are each a light source used in a head-up display device according to the present invention, in which two LEDs are opposed to each other, and FIG.
(B) is a plan view thereof.

FIG. 5 is an explanatory diagram of a conventional head-up display device.

FIG. 6 is an explanatory view showing the principle of a hologram virtual image.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 31 ... Lower housing 32 ... Upper housing 33 ... Horizontal support shaft 34 ... Bracket 35 ... Mounting screw 36 ... Combiner 37 ... Bag light 38 ... Liquid crystal display 39 ... Light source 40 ... Display window 41 ... Aperture 42 ... Light source case 43 ... LED 44 ... Condenser lens 45 ... Mounting bracket 46 ... Reflector

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03B 21/00 G03B 21/00 D 35/08 35/08 F term (Reference) 2H059 AC04 2H088 EA23 HA10 HA21 HA22 HA28 MA20 3D044 BA22 BA27 BA28 BB01 BC25 BC27 BD13 5G435 AA03 AA18 BB12 BB19 GG02 GG08 GG23

Claims (1)

[Claims] 1. A vehicle head-up display device having a transmission / reflection plate having a hologram for reproducing and displaying a hologram image and a reference light source for reproducing and displaying the hologram image, wherein an LED is used as the reference light source, A head-up display device for a vehicle, wherein the light of the LED is condensed on an aperture via a condensing lens, and the condensed light is applied to a reflector.