JP2582395Y2 - Head-up display device with automatic dimming function for vehicles - Google Patents

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 having an automatic light control function for a vehicle.

[0002]

2. Description of the Related Art A conventional head-up display device having an automatic light control function for a vehicle of this type is, for example, as shown in FIGS. Specifically, a main body case 3 having an opening 2 on an upper surface is provided inside an instrument panel 1 provided in front of a driver's seat, and a sub display 4 having a fluorescent display tube is provided inside the main body case 3. And a flat mirror 5 for reflecting a display image from the sub-display 4 is provided. Further, the opening 2 is provided with a transparent cover 6 for preventing dust from entering the main body case 3. Projector 16 is formed. Further, a translucent reflector (combiner) 8 serving as a half mirror is provided on the inner surface of the windshield 7 located above the instrument panel 1 so that the display image of the sub-display 4 can be transmitted to the plane mirror 5 and the translucent panel. The light is reflected by the reflective reflector 8, and the translucent reflector 8 can read the display image on the display 4 together with the scene in front of the vehicle.

Also, the defroster does not make it difficult for the display itself by the projector 16 to be visually recognized due to a change in the brightness of the background of the display portion, for example, too bright, too dazzling, dark and invisible, and difficult to see in a double image in the evening. A configuration in which the brightness of the external light is detected by using the optical sensor 11 disposed in the garnish 13 and the light is automatically adjusted so as to keep the ratio between the display luminance and the external light constant according to the detected output. Have been.

Reference numeral 9 denotes a main display which is provided inside the instrument panel 1 and displays, for example, an analog type or a digital type, for displaying a vehicle speed engine speed, etc., and 15 denotes the main display 9 and the sub-display. A display controller for driving the sub display and the main display;
, A reference numeral 10 denotes an optical sensor drive circuit.

However, in such a conventional head-up display device having an automatic light control function for a vehicle, the optical sensor 11 used in the head-up display device having the automatic light control function is used even in the daytime. Since the display brightness must be changed depending on the brightness of the external light, high-precision photometry is required. This requires the use of the optical sensor drive circuit 10 whose circuit is complicated, or the high-precision high-precision head-up. The display light sensor 11 must be used.

However, in a conventional head-up display device having an automatic dimming function, the optical sensor 11 is mounted on a surface of a defroster garnish 13 mounted on the upper surface of the instrument panel 1, for example. The light sensor 11 is apt to receive direct light because the light sensor 11 is located at a position that is easily affected by external light. The characteristics of the light sensor 11 are liable to change due to temperature change due to external light heat or the like. As a result, there is a problem that the external light measurement accuracy is reduced.

In the prior art, since the optical sensor 11 is provided separately from the projector 16 in the instrument panel, the work of installing the projector 16 and the optical sensor 11 and the work of connecting the circuits are troublesome, and the assembly work is difficult. There were also problems such as poor economic efficiency.

In order to solve these problems, the applicant of the present application has attached an optical sensor integrally to the lower part of the projector of the head-up display device, and provided a light guide for receiving external light to the optical sensor. A head-up display device that can be used to prevent a characteristic change due to external light heat of an optical sensor and maintain a highly accurate optical sensor has already been filed.

[0009]

However, in a light guide used to guide light to an optical sensor, it is possible to block heat conduction to the optical sensor, but to block ultraviolet light and infrared light. Since the light sensor cannot be used, ultraviolet light and infrared light act on the optical sensor via the light guide, and the characteristics of the optical sensor are degraded by the ultraviolet light and infrared light, which may cause a malfunction that is likely to occur.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and a light guide for guiding external light to an optical sensor can cut ultraviolet light and infrared light. Molded using a transparent material, the use of this light guide suppresses the heat receiving action of the optical sensor and the deterioration action by ultraviolet and infrared rays, prevents changes in the characteristics of the optical sensor, and provides excellent accuracy and reliability. It is an object of the present invention to provide a head-up display device having an automatic dimming function capable of maintaining a light sensor.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. The same parts of the structure of the present embodiment and the structures described in the conventional example are denoted by the same reference numerals as those in the conventional example. do it,
The description of the same structure is omitted.

That is, an optical sensor unit in which the optical sensor 11 and the optical sensor drive circuit 10 are integrated is disposed below the main body case 3 of the projector 16 and is integrally provided with the projector 16 via the mounting member 20. Case 3
As a means for allowing the light sensor 11 arranged at the lower part to receive external light, a light-receiving end is formed by using a light guide 14 made of a heat-resistant acrylic material having a light-receiving end protruding above the instrument panel 1 (from the surface of the finisher 12). The light is received by the optical sensor 11.

The material of the light guide 14 is a transparent plastic mixed with a dye that absorbs infrared rays and an ultraviolet absorber. The light receiving end of the light guide 14 slightly protruding from the surface of the head-up display finisher 12 has a truncated conical shape as shown in FIG. 5, and the surface of the light receiving end has a satin finish to prevent surface reflection. Has been treated. In addition, in the case of a heat-resistant acrylic material in which the light guide 14 is transparent, a smoke color is used so as not to change the wavelength of the guided external light in order to reflect a window at night or the like.

The above is the structure of the present embodiment. Next, the operation will be described. In FIG. 3, the display light emitted from the display 4 by the fluorescent display tube passes through the representative optical path b and is reflected by the plane mirror 5. The optical path is bent and passes through the representative optical path a.
The display light passing through the representative optical path a enters one point P on the inner surface of the windshield 7 and is reflected by the translucent reflector 8, and is displayed on the display 4 together with the scene in front of the vehicle by the translucent reflector 8. The image can be read.

The head-up display finisher 1 is provided so that the display image on the display 4 is not difficult to recognize.
The external light is taken in from the light receiving end of the light guide 14 slightly protruding from the second surface, and the external light is guided to the optical sensor 11 provided below the projector 16 to detect the brightness of the external light. The display controller 15 is driven by the detection signal from the controller 11 and the automatic dimming control of the display 4 is performed so that the ratio between the display luminance and the external light is kept constant according to the detection output.

Therefore, according to this embodiment, the optical sensor 11 for adjusting the brightness of the display according to the external brightness and the drive circuit 10 thereof are provided integrally with the projector 16 of the head-up display device. Therefore, by attaching the projector 16 to the vehicle body, the optical sensor 11 is also provided on the vehicle body, and the work of assembling the head-up display device having the automatic light control function to the vehicle body is greatly improved. Further, since the light guide 14 is used as a light receiving means for the optical sensor 11, the optical sensor 1
1 is not irradiated with direct light, so that the optical sensor 1
1 does not receive a temperature change due to direct radiation. Further, since the material of the light guide 14 is formed of an infrared absorbing dye and plastics mixed with an ultraviolet absorber, the ultraviolet light and infrared light contained in the extraneous light incident on the light guide are guided by the light guide. The light is cut while being guided by the light body. As a result, ultraviolet light and infrared light are not applied to the light sensor.
Also, there is no characteristic change (deterioration) due to infrared rays or the like, and automatic light control with excellent reliability and accuracy can be performed.

[0017]

As described above, according to the present invention, the display of information such as characters and figures is reflected by the windshield 7 of the vehicle or the translucent reflection plate 8 provided in front of the windshield, and a virtual image is displayed in front of the windshield. In the head-up display device provided with the projector 16 in the instrument panel 1 and projecting the information by superimposing the information on the external scene, the optical sensor 11 and the optical sensor driving circuit 10 A head provided integrally with the projector 16 and having a light guide 14 for guiding external light to the optical sensor 11 integrally attached to the projector, and the light guide having characteristics of cutting off ultraviolet light and infrared light of external light. Since this is an up display device, according to this, the optical sensor 11 is not irradiated with direct light, and But not subject to temperature changes due to direct. Further, since the material of the light guide 14 is formed of an infrared absorbing dye and plastics mixed with an ultraviolet absorber, the ultraviolet light and infrared light contained in the extraneous light incident on the light guide are guided by the light guide. The light is cut while being guided by the light body. As a result, ultraviolet light and infrared light are not applied to the optical sensor. Therefore, in the optical sensor 11, characteristic changes (deterioration) due to thermal ultraviolet light, infrared light, and the like are caused. There is no effect, and an effect is obtained that automatic light adjustment with excellent reliability and accuracy can be performed.

[Brief description of the drawings]

FIG. 1 is a structural explanatory view of a conventional head-up display device.

FIG. 2 is an explanatory view of the external structure of a conventional instrument panel.

FIG. 3 is a structural explanatory view of the head-up display device according to the embodiment of the present invention;

FIG. 4 is an explanatory diagram of an external structure of an instrument panel portion according to the embodiment of the present invention.

FIG. 5 is an explanatory view of a main part structure of the embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Instrument panel 2 ... Opening 3 ... Main body case 4 ... Sub-display 5 ... Flat mirror 6 ... Transparent cover 7 ... Front glass 8 ... Translucent raw reflection plate 9 ... Main display 10 ... Optical sensor drive circuit 11 ... Light Sensor 12: Display finisher 13: Defroster garnish 14: Light guide 15: Display controller 16: Projector 17: Sensor

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B60K 35/00 G09G 3/00 G02F 1/13 505 G02F 1/133 580 G01J 1/02 G02J 1/04

Claims (1)

(57) [Scope of request for utility model registration] 1. A projector for projecting a virtual image display image in front of a windshield by reflecting an information display such as characters and figures on a windshield (7) of a vehicle or a translucent reflector (8) provided in front of the windshield. In a head-up display device provided with (16) in an instrument panel (1) and having an automatic dimming function for displaying the information in a manner superimposed on an external scene, an optical sensor (11) and an optical sensor drive circuit ( 10) is provided integrally with the projector (16), and a light guide (14) for guiding external light to the optical sensor (11) is integrally attached to the projector. A head-up display device having an automatic dimming function, which has a characteristic of cutting off infrared rays.