JPH04155702A - Display device for vehicle - Google Patents

Abstract

PURPOSE:To obtain a display device for vehicle by providing a light reflecting part on the rear surface of a base of a transparent resin, by putting shades into a multilayered film so as to form a pattern through a transparent hole, and by providing LED on the rear surface side of the base, so as to make it move synchronously with a brake pedal. CONSTITUTION:A base 5 of a display part 1 made of transparent synthetic resinous plate, has a light reflecting part 6 due to a fisheyed convex part 6a, and is covered with a shade film 7. The letters STOP are drawn by utilizing a slit 9 that forms a pattern 8, on a part of the shade. An ELD 10 is fixed to the upper part of the shade film 7, and when a switch SW is turned ON, voltage is applied thereto. When a brake pedal is not applied, light is incident only from the side of the surface of the base 5 (or the rear part of an automobile) of this braking display lamp, and since the light reflected on the reflecting part 6, the slit 9 is hard to discriminate. When the braking is carried out while the pedal is given, since the switch SW of a power circuit 2 is closed and the ELD 10 is illuminated, large part thereof is shaded, and the light passing the slit 9 is focused on the convex part 6a of the reflecting part 6, and the letters STOP can thus be recognized as a pattern 8 from the rear part of the automobile.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle display device such as a brake display device installed in a vehicle.

[Prior art and problems to be solved by the invention] Conventionally,
As a braking display device for a vehicle, there is a structure in which a large number of LEDs (light emitting diodes) are arranged to express characters such as 5TOP, and the LEDs emit light during braking in conjunction with a brake pedal. However, since this device requires a large number of LEDs to express characters, etc., the structure such as wiring becomes complicated, the characters, etc. that can be displayed are limited, and the cost is high.

Furthermore, there are advertising display members that are attached to the rear of a vehicle, etc., but conventional display members are always in the same state regardless of day or night, so there is a problem that it is difficult to attract attention and the advertising effect is low.

The present invention has been made in view of the above problems, and includes:
The purpose is to provide a display device for a vehicle that has a simple structure and that allows characters, etc. to stand out only when the vehicle is braking, thereby easily attracting people's attention.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes forming a light reflecting portion having unevenness on the back surface of a base material made of a transparent resin,
A light-shielding film is provided on the light-reflecting portion, and a through-hole forming a pattern is formed in the light-shielding film, and a light-emitting member is disposed on the back side of the base material to irradiate light into the through-hole of the light-shielding film; The light emitting member was connected to a power supply circuit having a switch that was turned on and off in conjunction with the brake pedal.

[Operation] When the light emitting member does not emit light, that is, when the brake pedal is not in the braking position, light incident from the surface side of the base material is reflected by the light reflecting portion. Therefore, the through holes provided in the light shielding film cannot be identified from the surface side of the base material and cannot be seen as a pattern.

When the brake pedal is operated to the braking position and the light-emitting member enters the light-emitting state, the light-shielding film is irradiated with light from the light-emitting member. The light emitted from the light emitting member passes through the through holes forming the pattern formed in the light shielding film and is transmitted through the base material. Therefore, the light transmitted through the holes and the base material appears as a pattern from the surface side of the base material.

[Embodiment] An embodiment in which the present invention is embodied in a brake display device for an automobile will be described below with reference to FIGS. 1 to 3.

As shown in FIG. 1, the brake display device is composed of a display section 1 and a power supply circuit 2. As shown in FIG. As shown in FIG. 2, the display section l is formed in a horizontally elongated manner so as to be attached to the center of the lower part of the rear window 4 of the automobile 3. The power supply circuit 2 is provided with a switch SW that is turned on and off in conjunction with the brake pedal.

The base material 5 constituting the display section 1 is made of transparent synthetic resin and is formed into a plate shape, and has a large number of hemispherical (fish-eye) convex portions 6a on its entire back surface (right side in FIG. 1). The portion 6 is integrally formed. The light reflecting section 6 has a function of reflecting light incident from the front side of the base material 5 and a function of converging light incident from the back side of the base material 5. A light shielding film 7 having a thickness of 5 to 60 μm and having a silver metallic color is formed on the light reflecting portion 6 . As the material of the base material 5, a transparent synthetic resin such as polymethyl methacrylate, polycarbonate, polyurethane, or epoxy resin is used. Transparent here includes not only colorless and transparent, but also colored and translucent. In this example, the base material 5 is made of polymethyl methacrylate and is entirely colored yellow.

A large number of slits 9 serving as through holes forming the pattern 8 are formed in a part of the light shielding film 7 . The pattern 8 is formed as a whole to represent the alphabet "rsTOP", and the slits 9 are formed with lengths corresponding to each letter in a state extending in the horizontal direction so that the whole can be visually recognized as a letter of each alphabet, as shown in FIG. It is formed. Said slit 9
The width W is 0.1 mm and the distance between adjacent slits 9 is 0.
．． It is formed to have a thickness of 5 mm.

A light shielding film 7 corresponding to the pattern 8 is provided on the back side of the base material 5.
On the top, E L (Electr.

Luminescence) The light emitting element 10 is fixed with adhesive or double-sided adhesive tape. This EL light emitting element 10 has a structure in which an EL phosphor thin film is sandwiched between transparent electrodes and metal electrodes with high reflectance, and the EL light emitting element 10 of this embodiment emits a green color when a voltage is applied. It is designed to emit light. And this EL light emitting element 1
0 is connected to the power supply circuit 2, and when the switch SW is turned on, a voltage is applied to the EL light emitting element 10 as φ.

Since the light shielding film 7 is provided on the light reflecting part 6 which has many irregularities, it is difficult to form straight slits 9 neatly by masking when applying silver metallic paint. Therefore, in this embodiment, a silver metallic paint was applied to the entire surface of the light reflecting section 6, dried and hardened, and then the slits 9 were formed by laser beam processing. A Nd-YAG laser processing machine was used for laser beam processing, with an output iw and a scan speed of 100 mm/se.
In step e, the light shielding film 7 was directly irradiated with laser light. When the light-shielding film 7 is irradiated with laser light, the corresponding portion of the light-shielding film 7 is vaporized and removed, and the removed portion becomes the slit 9.

In the brake display device configured as described above, when the EL light emitting element 10 does not emit light, that is, when the brake pedal is not in the braking position, the brake display device can only be viewed from the front side of the base material 5, that is, from the rear of the automobile 3. Light is irradiated. car 3
The light irradiated onto the display part l from the rear of the display unit 1 passes through the base material 5, or since the light reflection part 6 is formed on the back side of the base material 5, the light is reflected by the light reflection part 6. Ru. Therefore, although many slits 9 are formed in the light-shielding film 7, these slits 9 are difficult to distinguish from the rear of the automobile 3, and the slits 9 appear yellow as a whole.

When the brake pedal is depressed and the vehicle 3 is braked, the switch SW of the power supply circuit 2 closes and the EL light emitting element 10
A voltage is applied to. As a result, the EL light emitting element 10 emits green light, and this green light is irradiated onto the back side of the base material 5. Since the light shielding film 7 is formed on the back surface of the base material 5,
Most of the light from the EL light emitting element 10 is blocked by the light shielding film 7, and the light that has passed through the slit 9 is transmitted through the base material 5 as shown by the arrow in FIG. At this time, the light passing through the slit 9 is converged by the convex portion 6a of the light reflecting portion 6. Therefore,
The light passing through the many slits 9 can be seen from the rear of the car 3, and the letters "5TOP" as the pattern 8 are visible on the base material 5.
It appears to be floating on the surface. In other words, the display unit 1 displays rs only when the brake pedal is depressed.
Since the letters TOPJ are displayed, it is easy to attract the attention of the viewer.

In this embodiment, the pattern 8 is formed of a large number of slits 9 instead of forming through-holes in the light-shielding film 7 in a shape that completely corresponds to the pattern 8, so that the processing time using the laser beam is shortened.

Note that the present invention is not limited to the above embodiments,
For example, the configuration and formation method of each part may be changed as desired without departing from the spirit of the invention, as described below.

(1) The light shielding film 7 is formed by forming a coating film of black paint on a coating film of silver metallic color paint. In this case, leakage of light from the light-shielding film 7 is reliably prevented, and the pattern 8 appears more prominent when the light-emitting member emits light.

(2) The slits 9 constituting the pattern 8 may be made into a shape other than a straight line, such as a zigzag or spiral shape, or the through holes may be made into a shape corresponding to the pattern 8 or a number of dots.

(3) A light bulb or a light emitting diode (LED) is used as a light emitting member instead of the EL light emitting element 1o. In this case, it is preferable to arrange a reflector on the opposite side of the light shielding film 7, sandwiching the light bulb or LED. Since the LEDs do not constitute the pattern themselves, but are used solely as light sources, the number of LEDs required is much smaller than in the conventional example.

(4) The convex portion 6a of the light reflecting portion 6 is formed in the shape of a pyramid such as a quadrangular pyramid or a truncated pyramid, or the convex portion 6a is formed only in an area corresponding to the pattern 8 instead of on the entire back surface of the base material 5. .

(5) The base material 5 is uncolored and transparent, and the EL light emitting element 10 is one that emits red light.

(6) When forming the slits 9 in the light-shielding film 7 by laser beam processing, the light-shielding film 7 is irradiated with laser light from the surface side of the base material 5 instead of directly irradiating the light-shielding film 7 with laser light.

In this case, the output of the laser beam is adjusted to 2 W and the scanning speed is adjusted to 200 mm/sec.

(7) Change the pattern displayed on the display unit l to characters or figures other than rsTOP, or change the mounting position and use it as a display device other than a brake display device.

In this case, if the through holes that make up the pattern 8 are formed by laser beam machining, simply by changing the area irradiated with the laser beam,
Various logos, grade names, patterns, etc. can be easily formed, and original characters, patterns, etc. can also be easily formed according to demand. Therefore, it is possible to cope with high-mix low-volume production, which is preferable in terms of production control.

[Effects of the Invention] As detailed above, according to the present invention, although the structure is simple, patterns such as letters appear raised on the display only when the vehicle is braking, so they easily attract people's attention. The braking display effect and advertising effect will be enhanced.

[Brief explanation of the drawing]

Fig. 1 is a schematic cross-sectional view of one embodiment of the present invention as a brake display device, Fig. 2 is a partial perspective view showing a state in which the display section is attached to the rear of an automobile, and Fig. 3 is a pattern configuring. FIG. 3 is a diagram showing the arrangement of slits. DESCRIPTION OF SYMBOLS 1... Display part, 2... Power supply circuit, 5... Base material, 6
...Light reflecting part, 6a... Convex part, 7... Light shielding film, 8
...Pattern, 9...Slit as a through hole, 10...
- EL light-emitting element as a light-emitting member, SW...Sui-Sochi.

Claims (1)

[Claims] 1. A light reflecting part (6) having unevenness is formed on the back surface of a base material (5) made of transparent resin, and a light shielding film (7) is provided on the light reflecting part (6). A light-emitting member (10) is formed on the back side of the base material (5) to irradiate light into the through-holes (9) of the light-shielding film (7). A switch (SW) is provided, and the light emitting member (10) is turned on and off in conjunction with the brake pedal.
A display device for a vehicle, characterized in that it is connected to a power supply circuit (2) having a power supply circuit (2).