JPH03182847A - Reflection type display for vehicle - Google Patents

Abstract

PURPOSE:To make the whole of a device compact by providing a transmittant reflecting member having a reflecting surface for transmitting the display light between a display and a reflecting member of a display located in an instrument panel and for performing remote display with the reflecting surface. CONSTITUTION:A display, which consists of a light emittion type analogmeter 1 comprising a back light, a prism 2 as a reflecting member and a total reflection type spherical mirror (reflecting member) 3 of which surface is recessed a little, is housed in an instrument panel 4. Te display light of the light emission type analogmeter 1 is transmitted through the prism 2 to be reflected by the spherical mirror 3, and furthermore, it is reflected by a reflecting surface of the prism 2. A virtual image X can be thereby seen at a position back of the prism 2 (in front of a vehicle) with a view from near a supporting point 8 of a driver. The spherical mirror 3 is located in a position so that the radial center point of the reflecting surface thereof coincides with a position previously set as a supporting point of the driver seat side.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a display device for a vehicle that displays driving information to a driver at an inlet panel position of a vehicle.

[Conventional technology]

Hitherto, in order to speed up the visual recognition speed of the display, a display device for a vehicle has been proposed that uses the anti-U=1 surface to perform long-distance display; for example, there are devices shown in FIGS. 13 and 14. .

In the case of the device shown in FIG.
3, and a half mirror 24 is installed in the meter display section of the instrument panel 21, and the display 23
The virtual image 2 of the display on the display 23 is projected through the half-Ku-2i.
5 can be visually recognized.

As a result, the visually recognized virtual image 25 is half-sized
4 and the display 23, the position is set back □ behind the half-column 24, and the effect of distant display can be obtained.

In addition, the device shown in FIG.
A reflector 36 facing the half mirror 34 and a display 33 facing the reflector 36 are provided in the meter foot 32, and the displayed image of the display 33 is projected onto the half mirror 34 via the reflector 36. A virtual image 35 displayed on the display 33 is made visible through the half mirror 34 and the reflection plate 3G.

As a result, the optical path length from the display device 3 (3) to the half mirror 34 becomes longer, and for example, the effect of displaying at a further distance than in the device shown in FIG. 13 can be improved by HBB.

It should be noted that 27 in FIG. 13 and 37 in FIG. 14 are other display devices that appear overlapping with the displayed virtual image 2 5 g 3 5, respectively.

[Problems to be Solved by the Invention] However, the effect of distant display cannot be sufficiently obtained with the device shown in Fig. 13; For this reason, if we try to lengthen the optical path length by increasing the same number of reflections as in the device shown in Figure 14 of L, the physical size of the optical path increases by 1j,
There is a problem in that the entire device becomes larger.

The object of the present invention (J) is to make the entire device compact and to lengthen Rli El for distant display from μ in a reflective display device for a vehicle that performs distant display using a reflective surface.

[Means to solve the problem]

A reflective display device for a vehicle according to the present invention, which has been made to solve the above problems, includes a display device, a reflective member having a spherical reflective surface facing the display surface side of the display device, and the display device and the reflective display device. 14 member, and a translucent reflector that has a reflective surface that transmits the display light from the display device, and the center point in the radial direction of the reflective surface of the reflective member is the viewpoint of the driver's seat example. Light that is arranged so as to optically match or approximately match a preset position, and that passes through the reflector and enters the reflective surface of the reflective member, and the light that is reflected by the reflective surface. The reflecting member is arranged so that the axes are coaxial or paraxial, and the reflected light from the reflecting surface of the reflecting member is reflected toward the driver's seat side from the reflecting surface of the reflector.

[For production]

In the reflective display device for a vehicle of the present invention, display light from the display device passes through the reflector, this transmitted light is reflected by the reflector, and further reflected by the reflector (trough) g. Begged for.

At this time, since the optical axes of the incident light and the anti-1.j light in the reflection part are coaxial or paraxial, the optical path of the incident light from the reflector to the reflection part and from the reflection member to the reflector are It occupies approximately the same space as the optical path of the anti-9.1 light that it traces.

Also, among the light rays that enter the reflective member from the driver's seat side via the reflective surface of the reflector L7, the light rays that are reflected by the reflective member and the reflective surface of the reflector and head toward the viewpoint position pass near the viewpoint position. Limited to light rays incident on a reflector.

〔Example〕

FIG. 2 is a diagram showing how the reflective display device for a vehicle according to the embodiment of the present invention is installed.

In the figure, 1 is a non-client (as explained later).
2 is a prism as a reflector, and 3 is a slightly concave totally reflective spherical ε mirror (separate member); The display device of the embodiment is constituted by the mirror 3 and is an instrument panel.Note that 5 is a steering wheel column, 6 is a steering wheel, and 7 is a windshield.

As will be explained in detail later, the display light of the light-emitting analog meta-meta-1 passes through the prism 2, is reflected by the spherical mirror 3, is further reflected by the reflective surface of the prism 2, and is reflected from the vicinity of the driver's viewpoint 8. When viewed, a virtual image X is visually recognized at a position behind the prism 2 (in front of the vehicle).

FIG. 1 is a diagram showing the display device of the above embodiment, in which the prism 2
is disposed close to the dial 17, and on the opposite side of the prism 2, the spherical mirror is arranged so as to face the dial 17 of the luminescent analog meter 1 with an interval from the prism 2. 3 are arranged.

The dash-dotted line shown in the figure represents the light ray that finally goes from the light-emitting analog meter 1 to the viewpoint position 8. To explain based on this ray tracing, the display light emitted by the light-emitting analog meter 1 is The first on the entrance side of prism 2
The light is incident on the surface 2a at a right angle, but when it passes through the second reflection surface 2b of the prism 2, it is refracted along the optical axis A and enters the spherical mirror 3 at a substantially right angle.

On the other hand, the spherical mirror 3 satisfies the reflection conditions and reflects the incident light beam along an optical axis B that makes a slight angle with the optical axis A.
The reflected light beam is directed towards the second surface 2b.

Further, the reflected light beam is reflected by the second surface 2b and directed toward the viewpoint position 8 in the direction of the optical axis C. Here, optical axis Δ and optical axis B
may be coaxial or paraxial, but since the optical axes A and B are close to each other, the light beam will reciprocate between the second surface 2b of the prism 2 and the spherical mirror 3.

Therefore, the optical path length during this period is approximately twice the distance between the second surface 2b and the spherical surface 3, and the entire apparatus can be made compact by lengthening the optical path and reducing the space occupied by the optical path.

At this time, the virtual image visible from the viewpoint position 8 is the prism 2
The distance from the second surface 2b to the virtual image is (α, β+rrδ) in the same figure.
The sum of the distances between each member shown in is larger than α+β→−γ+δ.

That is, the spherical mirror 3 is made slightly concave, and the light-emitting analog meter 1 is optically placed inside the focal point F of the spherical mirror 3, as shown in FIG. As a result of this action, the virtual image
It is visually recognized at a position further back than the position α1β+γ+δ away from b.

Since the display image is enlarged and displayed using the spherical mirror 3 in this way, the light-emitting analog meter 1 can be downsized. Furthermore, since the center of the sphere of the spherical mirror 3 is set to approximately coincide with the viewpoint position 8, as shown in FIG. Among the incident light beams, the spherical mirror 3 and the second
The light rays reflected by the surface 2b and directed toward the viewpoint position 8 are limited to the light rays directed from the viewpoint position 8 toward the second surface 2b. However, since the driver's face is actually located at this viewpoint position 8, the driver does not see the external light that enters the spherical mirror 3 via the second surface 2b.

Therefore, even if external light such as the headlights of a following vehicle or sunlight at sunset enters the rear of the vehicle interior, the driver will not be dazzled.

Further, the optical positional relationship with the viewpoint position 8 can be easily set, for example, by adjusting the angle of the spherical mirror 3 while the light-emitting analog meter 1 and the prism 2 are fixed to the instrument panel 4. I can do it.

Next, the positional relationship between the viewpoint position 8 (direction of the optical axis C) and the prism 2 and the characteristics of the prism 2 will be explained.

FIG. 3 is a diagram showing a state in which a virtual ray l is incident on the prism 2 from the viewpoint position 8 side, and the locus of this virtual ray i is considered to be the line of sight from the viewpoint position 8 in terms of geometric optics. be able to.

The brism angle θ between the first surface 2a and the second surface 2b of the prism 2 means that the light ray l is refracted and enters the prism 2 from the second surface 2b of the prism 2, and this incident light ray l enters the prism 2.
The angle is set such that total reflection occurs on the inner first surface 2a. That is, the angle ψ in the figure is made larger than the critical angle of total reflection at the first surface 2a. Even on the second side 2b, the entire fabric is separated.

Therefore, from the direction of the light ray i (direction of the viewpoint position 8), the second part 2b+ of the prism 2: When desired, the outside of the first surface 2a, that is, the light-emitting analog meter 1, passes through the prism 2 from the second surface 2b. It cannot be seen directly.

In this way, the light-emitting analog meter 1 cannot be seen through the prism 2 due to total reflection, so the prism 2 and the light-emitting analog meter 1 can be brought as close together as possible, and the prism 2 and the spherical mirror 3 It is possible to increase the distance of distant display by increasing the interval between the two.

Furthermore, when the second surface 2b is viewed from the direction of the light ray l as described above, the third surface 2c is visible through the second surface 2b and the first surface 2a in the prism 2. However, in the prism 2 of this embodiment, a black painted surface 2d is formed on the third surface 2c, and it actually looks dark, but the light-emitting analog meter 1 is not visible against this dark background. The displayed image is displayed at a distance and the contrast is increased.

In addition, as explained about the light ray r and the total internal reflection within the prism 2 in Figure 3 of Section 2, the light that enters the prism 2 from the second surface 2b passes through the first surface 2a and is reflected in the light-emitting analog meter. 1, it is possible to prevent washout due to incidence of external light.

FIG. 6 is a partial cross-sectional view of the light-emitting analog meter 1, and FIG.
The figure is a partial front view, and FIG. 8 is an exploded perspective view thereof.

In the figure, numeral 11 is a meter internal mechanism that rotates a pointer shaft 11a in response to an electric signal input manually from a circuit not shown, and its internal structure is a miniaturized version of that of a conventionally known analog meter. be. I2 is meter internal unit 11
A case body 13 disposed on the front side of the pointer shaft 11a is housed in the case body 12 and rotates around the cylindrical concave reflecting surface 13a toward the opening side of the case body 12. It is a cold cathode tube (discharge lamp) arranged along the focal point f, and this cold cathode tube 14 is connected to a socket 15.
It is connected to an external power source via a lead wire (not shown) drawn out from the case body 12, and constitutes a high-output light source. Note that the reflector 13 is a cylindrical concave reflective surface 1.
3a forms a concave mirror, so the focal point r is at the 8th
It becomes a straight line as shown in the figure.

1G is a light diffusing plate disposed to cover the opening of the case body 12; 17 is a dial disposed on the front of the light diffusing plate 16;
Reference numeral 18 denotes a disc-shaped pointer plate arranged on the front surface of the dial 17, and the center of this pointer plate 18 is fixed to the tip of the pointer shaft 11a.

As shown in FIG. 7, the dial 17 has a black face surface 17a (shaded area) formed by printing black on a transparent resin plate, and the scale and number 3 character area 17b are cut out characters. The scale and number portions and the circular portion overlapping with the pointer plate 18 are made transparent. In addition, the pointer plate 18 has a black face surface 18a (shaded area) formed on a disc-shaped transparent resin plate by black printing process, and a part of the black face surface 18a (shaded area) is not printed in the radial direction from the vicinity of the center, so that the light transmittance is improved. A slit 18b is formed, and this slit 18b serves as a pointer.

Incidentally, the scale and number portion 17b and the ring 18b described above can also be formed by punching using a light-opaque member.

By the way, in many analog meters for general use in cars, the scale is not formed around the entire circumference, but is formed approximately in the range from 8 o'clock to 4 o'clock clockwise on a clock face.

The scale of the dial 17 of this embodiment is not formed all around the circumference as shown in FIG. 7, but the center of the pointer plate 18 is placed a certain distance d below the center of the height H of the scale. It is set in the wrong position. Further, as shown in FIG. 6, the height of the reflective surface 13a of the reflector 13 is set to include the height H of the scale portion, and furthermore, the center and the position of the cold cathode tube 14 are , coincides with approximately the center P of the height I4 of the scale portion.

Then, in correspondence with the center of the pointer plate 18, a dial 17,
Shaft holes 17c, 16a, 13b, and 12a with small diameters are formed in the light diffusing plate 16, reflector 13, and case body 12, respectively, and the pointer shaft 11a is inserted into each shaft hole 12a.
, 13b, 16a, and 17c, and passes under the cold cathode tube 14 toward the center of the pointer plate 18.

With the above configuration, the light from the cold cathode tube 14 is diffused by the light diffusing plate 16, and the light directed toward the reflector 13 is reflected by the reflecting surface 13a into substantially parallel light, which is then diffused by the light diffusing plate 16. And the light diffusing plate 16
Uniform and bright light is illuminated behind the dial 17 and pointer plate 18 through the dial 17, and only the scale, numerals, and 18b appear to emit light, and when the pointer plate 18 is rotated by the meter internal unit 11, , luminous pointer (slint 18
b) rotates to indicate the luminous scale, and analog display is performed.

In this way, in the light-emitting analog meter 1 according to the above embodiment, uniform and bright light is irradiated behind the dial 17 and the pointer plate 18, so that there is no unevenness in the amount of light on the display patterns such as the scale, characters, and hands. However, it is a light-emitting analog meter with high brightness, and is suitable for the reflective display device according to the present invention.

In the light-emitting analog meter 1 of the above embodiment, the dial 1
Although a slight clearance is provided between the pointer plate 7 and the pointer plate 18, light leakage may occur from this clearance. However, if it is incorporated into a reflective display device as described above, the light-emitting analog meter 1 will be viewed optically from the front, and the contrast will be enhanced by using the reflective surface. , this light leakage is almost invisible.

Incidentally, in order to further reduce this light leakage, the arrangement shown in FIG. 9 may be adopted, for example.

The light-emitting analog meter shown in the same figure has a dial and a pointer plate that are different from the configuration shown in Figure 8-6 above.
7' is placed on the front side, and a pointer plate 18' is arranged between this dial 17' and the diffuser plate 16.

In FIG. 9, parts similar to those in FIG. 8 are given the same reference numerals.

An opening 170' is formed in the part of the dial 17' facing the pointer plate 18', and the area around it is covered with black letters with the scale and number part 17b' cut out, as in FIG. A face surface 17a' is formed. Further, the pointer plate 18' has a black face surface 18a' formed with a groove 18b' like the pointer plate 18 described above.

The area around the opening 170' of the dial 17' is on the pointer plate 1B' side (light diffusing plate 16 side), as shown in the cross section in FIG.
A stepped portion 17d' is formed in the stepped portion 17d', and the periphery of the pointer plate 18' is loosely fitted into this stepped portion 17d' to provide a certain amount of clearance. This makes it possible to reduce light leakage from the clearance between the dial 17' and the pointer plate 18'.

7 In the reflective display device of the above embodiment, the spherical mirror 3 is used to enlarge the display and eliminate dazzle caused by external light. is in the longitudinal direction.

Therefore, when using the spherical mirror 3 in this way,
The display surface (dial 17) of the light-emitting analog meter 1 should not be made into a flat surface, for example, as shown in FIG. 11 and FIG. By doing so, deformation of the image caused by the spherical mirror 3 can be reduced.

In the case of FIG. 11(a), the dial 17 has a convex surface matching the curvature of the spherical mirror 3, and the radius of curvature r of this convex surface is the same as that of the spherical mirror 3, as shown in FIG. 11(b). When the distance from the convex surface of the rH1 dial 17 to the spherical mirror 3 is h, the radius of curvature of the dial 17 is set to rn=rH−h. Note that under this condition, the spherical mirror 3
Although it is not possible to completely correct the aberration caused by this, a sufficient correction effect can be obtained in practice.

8 The dial 17 shown in FIG. 12(a) has a multifaceted face that matches the radius of curvature of the spherical mirror 3, and as shown in FIG. It has a multifaceted structure with the following faces 17+=17z. Also, each plane portion 17 of this multifaceted plane. ．． 17□ has different meters (e.g. speedometer and tachometer)
The scale is being rampant.

In this way, when configured with multiple surfaces, the effect of correcting aberrations by the spherical mirror 3 is lower than that of the one shown in FIG. 11, but there is no problem in practical use and the bottom shape of a dial etc. can be easily formed. I can do it. As shown in FIG. 1, since the dial 17 of the light-emitting analog meter 1 and the spherical mirror 3 are opposed to each other in parallel, there is almost no deformation due to aberrations in the upper and lower positions of the scale of the dial 17. There is no deterioration in display quality in practical use.

Although a light-emitting analog meter is used in the above embodiment, it goes without saying that a display such as a fluorescent display tube or a liquid crystal display board may also be used.

〔Effect of the invention〕

As explained above, according to the reflective display device for a vehicle of the present invention, a display device, a reflective member having a spherical reflective surface facing the display surface side of the display device, and a combination of the display device and the reflective member. a translucent separate body disposed between them and having a reflective surface that transmits display light from the display device, the center point in the radial direction of the reflective surface of the reflective member being preset as the viewpoint position of the driver's seat example; The optical axis of the light that passes through the reflector and enters the reflective surface of the reflective part and the light that is reflected by the reflective surface are coaxial. Alternatively, the reflecting member is arranged so that the light reflected from the reflecting surface of the reflecting member is reflected toward the driver's seat side from the reflecting surface of the reflecting member, so that the distance from the reflecting member to the reflecting member is The optical path of the reflected light to be traced and the optical path of the reflected light to be traced from the reflecting member to the reflector occupy approximately the same space, making it possible to lengthen the distance for distant display while making the entire device compact. Of the light rays that enter the reflective member from the driver's seat side through the opposite surface of the reflector, the light rays that are reflected by the reflective member and the reflective surface of the reflector and head toward the viewpoint position are located near the viewpoint position. Since the light rays are limited to those that pass through the reflector and enter the reflector, the driver will not be dazzled even if external light such as the headlights of a following car or sunlight at sunset enters from either side of the driver. never be done.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a reflective display device for a vehicle according to an embodiment of the present invention, FIG. 2 is a diagram showing how the reflective display device for a vehicle according to an embodiment is installed, and FIG. 3 is a diagram showing a state of installation of a reflective display device for a vehicle according to an embodiment. FIG. 4 is a diagram showing the relationship between the spherical mirror and the viewpoint position in the embodiment. FIG. 5 is a diagram showing the positional relationship between the spherical mirror and the light-emitting analog meter in the embodiment. The figures are a partial sectional view of the light-emitting analog meter in the example. 1. Figure 7 is a -7" HII front view of the light-emitting analog meter. Figure 8 is an exploded perspective view of the light-emitting analog meter. 9. The figure shows another embodiment of the dial and pointer plate of a light-emitting analog meter. Figure 10 is a cross-sectional view of the same embodiment. Figure 11 is a diagram showing an embodiment in which the dial surface shape is spherical. , Fig. 12 is a diagram showing an embodiment in which the face shape of the dial is multifaceted, and Figs. 13 and 14 are diagrams showing an example of a conventional display device using a reflector. 1... Light emission type analog meter, 2...prism,
3... Spherical surface

Claims (3)

[Claims] (1) A display device, a reflective member having a spherical reflective surface facing the display surface side of the display device, and a reflective member disposed between the display device and the reflective member that transmits display light from the display device. a translucent reflector having a surface, and arranged so that the center point in the radial direction of the reflective surface of the reflective member optically coincides or substantially coincides with a position preset as a viewpoint position on the driver's seat side. , the optical axes of the light that passes through the reflector and enters the reflective surface of the reflective member and the light that is reflected by the reflective surface are coaxial or paraxial, and the reflected light from the reflective surface of the reflective member is A reflective display device for a vehicle, characterized in that the reflective member is arranged so that the reflection is reflected toward the driver's seat from the reflective surface of the reflector. (2) The reflector is a prism, and the first surface of the two meeting surfaces of the prism is opposed to the display surface of the display, and the second surface is the reflective surface of the reflector, and the two surfaces that meet so that the light incident on the second surface from the direction in which the reflected light from the reflective surface of the reflective member is reflected by the second surface is totally reflected on the first surface within the prism; 2. The reflective display device for a vehicle according to claim 1, wherein the reflective display device has an angle of . (3) The reflective display device for a vehicle according to claim 2, wherein surfaces of the prism other than the two surfaces that meet are treated to have a dark color.