JPS6225759Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a dial display device using an edge lighting method.

As is well known, dial display devices in various devices such as audio equipment receivers display dials by shining light from a light source onto a dial display board on which characters, scales, etc. are printed or engraved. It is configured. Figures 1 and 2 each show examples of conventional dial display devices. Of these, the one in Figure 1 prints or engraves light from a light source 2 through a lens 1 made of transparent plastic such as acrylic. This leads to a dial display board 3 on which a display section 4 of characters, numbers, etc. is formed. In this configuration, uniform illumination is difficult to obtain, and a large lens 1 and multiple light sources 2 are required, which increases power consumption and adversely affects safety standards and signal circuits due to heat from the light sources 2. Contains many other problems. Moreover, this type of device not only has a poor space factor and is large in size, but also has the disadvantage that in bright places, the illumination effect is reduced due to light interference.

The one shown in FIGS. 2a and 2b is the so-called edge lighting lighting method, and the back panel 5
A display section 4 is formed on the back side of a transparent dial display board 3 attached to the surface of the dial display board 3, and light from light sources 2, 2 arranged at both ends of the dial display board 3 is introduced into the inside of the dial display board 3, respectively. The dial will be displayed. In this device, the light peculiar to edge lighting does not hit the 4 parts of the display.
It exhibits so-called light piping characteristics and has the disadvantage that the illumination effect of light is reduced.

Therefore, the applicant has devised a dial display device that is an improved version of the device shown in FIG. 2, and has already applied for registration of a utility model for this device. This device covers the surface of the dial display board, except for the display parts such as letters and numbers, with a light-shielding film.
A rough surface is formed on the entire back surface to improve reflection, diffusion, and refraction, thereby improving the illumination effect of the display section. However, even in such a device, since the entire back surface is rough, there is a large amount of light leaking from the display board due to reflection, diffusion, and refraction before the light reaches the center of the dial display board, and as a result, the amount of light at the center is low. It was significantly reduced compared to both ends, and uniform illumination could not be achieved, leaving room for improvement.

This invention was made in view of the above points, and provides a dial display device using an edge lighting lighting method that makes the amount of light uniform over the entire dial display board and improves the lighting effect. The feature is that the dial display plate is made of a transparent material, and the transparent material is exposed on the surface of the dial display plate at the corresponding display parts such as numbers, letters, scales, etc. The remaining portions are covered with a light-shielding film having at least a reflective layer as the lowermost layer, and a rough surface is formed on the back surface of the light-shielding film in a portion corresponding to the display portion of the front surface.

Hereinafter, one embodiment of this invention will be described in detail based on the drawings.

FIG. 3 shows a dial display device according to this invention, in which a is a front view thereof, b is a vertical sectional view of the dial display board, and c and d are views showing the rough surface of the back surface corresponding to the display part of the dial display board. It is. In the figure, a dial display plate 10 is formed into a flat plate shape from transparent plastic, and its surface 10a is covered with a light-shielding film 11 except for a portion thereof. This light shielding film 11 is formed by a well-known aluminum vapor deposition method, an ultraviolet curing method, a hot stamping method, etc., and the characters, numbers, and scale 12a that constitute the display section 12 of the dial display board 10 are excluded. This display section 1
2, a transparent plastic material is exposed. In this case, the light shielding film 11 is printed on the bottom layer,
A reflective layer 14 with a high reflective effect such as white, silver, mirror surface, etc. by hot stamping, vapor deposition, etc.
(See Fig. 4) forms a double structure, and this reflective layer 14 reflects and transmits the light introduced into the dial display plate 10 to a farther distance without absorbing it, thereby creating a lighting effect. I'm trying to improve it further.

Approximately at the center of the back surface 10b of the dial display board 10, there is a dial pointer 1 along the entire length in the longitudinal direction.
A pointer hanging portion 16 is formed along the running direction of the pointer 5, and a portion corresponding to the display portion 12 is formed into a rough surface 17 by machining with a sander, brush cutter, etc., or by using corrosive ink, paint, etc. . This rough surface 17 may be formed along the contour of the numbers 12a (the same applies to letters and scales) of the display section 12 as shown in FIG. It may be formed, for example, in a square portion that surrounds 12a.

The pointer hanging portion 16 is composed of a groove 18, and both upper and lower side surfaces and the bottom surface thereof are connected to the back surface 10a of the dial display plate 10 (excluding the rough surface 17).
By leaving the mirror surface as is, the dial pointer 15 running at the rear of the dial display board 10 can be seen from the front. Therefore, the surface portion of the dial display plate 10 corresponding to the pointer hanging portion 16 is not covered with the light shielding film 11 because it is necessary to make the position of the dial pointer 15 visible.

Note that 20 is a silicon rubber cap constituting a colored filter that is removably placed over the light sources 13, 13. Further, both left and right end surfaces of the dial display plate 10 are formed into mirror surfaces in order to introduce the light from the light sources 13, 13.

Therefore, according to the above configuration, the light source 1 introduced into the inside from both sides of the dial display board 10
As shown in FIG. 5, the light from 3 and 13 hits the rough surface 17 of the dial display plate 10 and is diffusely reflected, and also reflects from the reflective layer 14 of the light shielding film 11 (however, it is omitted in FIG. 5).
Since the light is reflected by the light and guided to the center of the dial display board 10, the amount of light decreases little and the entire area can be uniformly illuminated. Furthermore, since the light hitting the rough surface 17 is reflected, diffused, and refracted by the rough surface 17, each display section 12 can be uniformly irradiated.
It can enhance the lighting effect. Moreover, when the dial display plate 10 is viewed from the front, the display section 12 appears to be shining due to the diffused reflection of light, so that a good display with an excellent design effect can be performed. In this case, the color of the illumination from the light sources 13, 13 can be easily changed by replacing the silicone cap 20, which not only makes the design effect even more remarkable, but also increases the brightness depending on the translucency of the cap 20. It has the advantage that it can be varied.

Although the above embodiment describes the case where the display section 12 is formed by the light-shielding film 11, the present invention is not limited to this, and letters, numbers, and scales may be engraved at a certain depth at predetermined locations on the dial display board 10. Alternatively, a display section may be formed, and a light-shielding film may be provided on the surface of the dial display plate 10, avoiding this display section.

As explained in detail above, according to the dial display device according to the invention, in the edge lighting method, the entire surface of the dial display board made of a transparent body other than the display area such as numbers, letters, scales, etc. , it is covered with a light-shielding film having at least a reflective layer on the bottom layer, and only the portion of the back surface corresponding to the display section is formed with a rough surface that diffusely reflects light, so that the reflection and transmission of light by the reflective layer is good, and the entire back surface is covered. Compared to those formed with a rough surface, there is less light leakage from the rough surface, and the light can be effectively guided to the center of the dial display board, making it possible to illuminate the entire display board more uniformly. Therefore, the display section can be easily recognized with a small number of light sources, and the display section looks shiny due to the diffused reflection of light by the rough surface, making it possible to display a dial with good lighting and design effects.

[Brief explanation of the drawing]

FIG. 1 shows an example of a conventional dial display device, in which a is a sectional view thereof, b is a plan view of a lens, and
The figure shows another example of a conventional dial display device,
a is its cross-sectional view, b is a plan view of the dial display board,
FIG. 3 shows an embodiment of the dial display device according to this invention, in which a is a front view thereof, b is a sectional view of the dial display board, and c and d are rough surfaces formed on the back surface of the dial display board. FIG. 4 is a sectional view of a main part showing another embodiment of the dial display board, and FIG. 5 is a diagram for explaining the effect of this invention. 10... Dial display board, 11... Light shielding film, 1
2...Display section, 13...Light source, 14...Reflection layer,
15... Dial pointer, 16... Pointer visible part, 17... Rough surface.

Claims (1)

[Scope of utility model registration request] In an edge lighting type dial display device having an illumination body at an end of the dial display plate, the dial display plate is made of a transparent material,
On its surface, the transparent material is exposed in areas corresponding to display parts such as numbers, letters, scales, etc., and areas other than the areas corresponding to the display parts are covered with a light-shielding film having at least a reflective layer on the bottom layer, and the back surface is covered with a light-shielding film having at least a reflective layer on the bottom layer. A dial display device characterized in that a rough surface is formed on a portion corresponding to a display portion of the dial display device.