JPH08105767A - Dialplate illuminating structure of instrument - Google Patents

Abstract

PURPOSE: To provide a dialplate illuminating structure, which can keep illumina tion balance without collapsing the chromaticity balance of a display part. CONSTITUTION: A reflecting layer 5, which is provided between a part other than a display part 2 of a dialplate 1 and a diffusing plate 4, is formed as net points, which are present in the network shape in the direction of the surface of the diffusing plate 4. Then, the net-point arranged around a display part 2a, which is close to a light source 6, and wherein illumination becomes brighter, is made thin. The net-point arrangement around a display part 2b, which is remote from the light source 6, and wherein the illumination becomes dark, is dense.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dial illuminating structure for an instrument mounted on a vehicle such as an automobile, and in particular, illuminating light from the back of the dial and transmitting this illuminating light through the display portion of the dial. TECHNICAL FIELD The present invention relates to a transillumination type dial plate illumination structure for illuminating by making it illuminate.

[0002]

2. Description of the Related Art In a transillumination type dial illuminating device, a diffuser plate is used to diffuse the light of a light source through the diffuser plate to allow the display portion of the dial plate to pass therethrough to enhance the light utilization rate. It is known to improve the lighting effect.

For example, as shown in FIG.
A diffuser plate 12 is superposed on the back surface of a dial 10 in which 1 is light-transmissive and a portion other than the display portion 11 is light-impermeable, and a portion other than the display portion 11 of the dial 10 and the diffuser plate 1 are arranged.
The reflective layer 13 is provided between the display unit 1 and the display unit 1 to diffuse the light of the light source 14 arranged on the back of the diffusion plate 12 by the diffusion plate 12.
1 is transmitted and illuminated, and the display unit 11
Light that has not passed through the display section 11 is repeatedly reflected and diffused by the reflective layer 13 and the diffusion plate 12 until it passes through the display section 11,
Thus, the utilization rate of light is increased to improve the lighting effect.

[0004]

Such a diffuser plate 12
Even in the illumination structure using the display unit 1, the display unit 1 close to the light source 14
Since the illumination is bright in 1 and the illumination is dark in the display section 11 far from the light source 14, the diffusion plate 12 is provided with a thick portion 12a and a thin portion 12b as shown in FIG. 4 in order to eliminate the uneven illumination. By changing the wall thickness or performing the die drawing process 12c, the illumination balance is improved in the entire area of the display unit 11.

However, if the thickness of the diffuser plate 12 is changed, the cost of the mold for the diffuser plate 12 increases, and in the case of the die drawing treatment, the die drawing treatment equipment is required. Both are disadvantageous in terms of cost.

Further, particularly when the thickness of the diffuser plate 12 is changed, the thick wall portion 12a and the thin wall portion 12b of the diffuser plate 12 are changed.
In that case, the color tone of the light transmitted through the display unit 11 is changed, and the chromaticity balance is lost even if the illumination balance is achieved.

Therefore, the present invention aims to provide a dial illuminating structure for an instrument, which is capable of maintaining the illumination balance without degrading the chromaticity balance of the display portion and causing no illumination unevenness in terms of cost. .

[0008]

According to a first aspect of the present invention, there is provided a dial plate having a light-transmitting display portion and light-impermeable other than the display portion, and a diffuser plate superposed on the back surface of the dial plate. , A reflective layer provided between the diffusion plate and a portion other than the display portion of the dial,
A dial illuminating structure, comprising: a light source disposed on the back of a diffuser plate, wherein the light of the light source is diffused by the diffuser plate and is transmitted through the display portion of the dial plate to illuminate the reflecting layer. In addition to forming halftone dots in a mesh pattern in the plane direction of, the sparse dot arrangement around the display part where the illumination becomes brighter near the light source and the dot arrangement around the display part where the illumination becomes darker from the light source It is formed as dense.

According to a second aspect of the present invention, the sparse and dense arrangement of halftone dots of the reflection layer provided between the diffusion plate and the portion other than the display portion of the dial is formed by white printing on the back surface of the dial. It is characterized by that.

According to a third aspect of the present invention, a dense and dense arrangement of halftone dots of the reflection layer provided between the diffusion plate and a portion other than the display portion of the dial is formed by aluminum vapor deposition on the back surface of the dial. There is.

According to a fourth aspect of the present invention, a portion other than the display portion of the dial is black-printed on the surface to make it impermeable to light.
It is characterized in that the display portion is black-printed and made light-transmissive.

[0012]

According to the present invention, since the halftone dot arrangement of the reflective layer is formed around the display portion near the light source, the reflectance of the light incident on the diffuser plate from the light source becomes low, and the light source Illumination is weakened by suppressing the amount of transmitted light in the near display area, and conversely, the reflection layer around the display area distant from the light source has a dense halftone dot pattern, so the light reflected from the light source to the diffuser is reflected. The ratio is increased, the amount of transmitted light in the display portion far from the light source is increased, and the illumination is weakened, so that the illumination balance of the entire display portion can be achieved.

Further, since the diffusion plate is not provided with the wall thickness changing portion, the illumination balance can be achieved over the entire display portion, so that the chromaticity balance of the display portion is not disturbed.

According to the second aspect, the dense and dense arrangement of the halftone dots of the reflection layer provided between the portion other than the display portion of the dial and the diffusion plate is formed by white printing on the back surface of the dial. because there is,
The reflective layer can be arranged around the display portion without any displacement, and the illumination balance can be improved.

According to a third aspect of the present invention, a dense and dense arrangement of halftone dots of the reflecting layer provided between the diffusion plate and a portion other than the display portion of the dial is formed by aluminum vapor deposition on the back surface of the dial. Therefore, it is possible to arrange the reflective layer around the display portion without causing a shift and improve the illumination balance, and of course, the reflective layer serves as a mirror surface so that the light reflectance is sparse and densely arranged. The illumination effect can be further improved by being uniformly increased by.

According to the fourth aspect, since the display portion of the dial plate is light-transmissive without black printing, the brightness of the light transmitted through the display portion is high and the illumination effect can be further improved.

[0017]

Embodiments of the present invention will now be described in detail with reference to the drawings.

In FIGS. 1 to 3, reference numeral 1 denotes a dial, and the surface of the portion other than the display portion 2 is black-printed to make it impermeable to light, and the display portion 2 is black-printed to obtain high brightness. It is light transmissive.

Reference numeral 4 denotes a diffusion plate composed of a transparent or translucent resin panel, which is superposed on the back surface of the dial 1, and is a dial 1.
Between the portion other than the display portion 2 of the display panel and the diffusion plate 4
Is provided.

The reflecting layer 5 is formed as halftone dots in a mesh shape in the surface direction of the diffusion plate 4, and the diffusion plate 4 is also formed.
The dot arrangement around the display portion 2a where the illumination is bright near the light source 6 arranged on the back of the display is sparse, and the dot arrangement around the display portion 2b where the illumination is distant from the light source 6 is dense. is there.

In this embodiment, the sparse and dense arrangement of the halftone dots of the reflective layer 5 is formed by white printing on the back surface of the dial plate 1 other than the display portion 2.

According to the structure of the above embodiment, during nighttime illumination of the dial 1, the light incident on the diffuser plate 4 from the light source 6 remains as it is in the portion of the diffuser plate 4 which is not covered with the reflective layer 5. 4 as well as the display part 2 of the dial 1 to illuminate the display part 2.

The light that has not passed through the display portion 2 is reflected by the reflection layer 5 and diffused, reflected by the surface on the opposite side of the diffusion plate 4, made incident on the reflection layer 5 again, and transmitted through the display portion 2. This reflection and diffusion are repeated until.

Here, since the reflective layer 5 is formed so as to have a sparse dot arrangement around the display portion 2a which is close to the light source 6 and the illumination tends to be bright, the reflective layer 5 is formed as shown by the arrow b in FIG. The light transmitted between the halftone dots of 5 is the black print 3 of the dial 1.
The light that is absorbed by and is reflected by the reflective layer 5 is reduced.

As a result, in the display portion 2a near the light source 6, the amount of transmitted light shown by the arrow a is suppressed to be small, and the illumination is weakened.

On the contrary, since the dot arrangement of the reflection layer 5 is densely formed around the display portion 2b where the illumination tends to be darker from the light source 6, the light due to the reflection layer 5 is formed around the display portion 2b. The reflectance is high and the amount of light transmitted through the display unit 2a is increased to enhance the illumination. Therefore, it is possible to improve the illumination balance in the entire region of the display unit 2 and eliminate the illumination unevenness.

Further, in particular, in this embodiment, since the display portion 2 is light-transmissive without black printing, the light incident on the display portion 2 is not absorbed but is transmitted as it is to obtain high brightness. In addition to the good lighting balance, the lighting effect can be further improved.

Moreover, since the sparse and dense arrangement of the reflective layer 5 is formed by white printing on the back surface of the dial plate 1 other than the display portion 2, the reflective layer 5 is formed on the basis of the display portion 2. Since the reflective layer 5 can be directly arranged on the back surface of the dial 1 in a dense and dense manner, the reflective layer 5 is not displaced with respect to the display portion 2, and therefore the illumination balance can be improved.

In the present embodiment, the reflective layer 5 is formed by white printing on the back surface of the dial 1 as described above.
Since the mirror surface 5a can be obtained by forming aluminum on the back surface of the aluminum by vapor deposition, it is possible to uniformly increase the reflectance of light in the sparse and densely arranged portions of the dots, and further improve the illumination effect.

Further, in both the white printing and the aluminum vapor deposition, since the thickness change portion of the diffusion plate 4 unlike the conventional case is not provided, the color tone of the light transmitted from the display portion 2 does not change. The chromaticity balance of the display unit 2 is not affected insignificantly.

[0031]

As described above, according to the present invention, the following effects can be obtained.

According to the first aspect of the invention, since the halftone dot arrangement of the reflective layer is formed around the display portion near the light source, the reflectance of the light incident on the diffuser plate from the light source becomes low and Illumination is weakened by reducing the amount of transmitted light in the near display area, and conversely, because the dot arrangement of the reflective layer is densely formed around the display area far from the light source, the light incident on the diffuser from the light source is reflected. Rate, the amount of transmitted light in the display section far from the light source increases, and the illumination is strengthened. Therefore, it is possible to improve the illumination balance over the entire display section and further improve the quality and reliability. it can.

Further, since the diffuser plate is not provided with the thickness varying portion in this way, the illuminance of the entire display portion is balanced by the sparse and dense arrangement of the halftone dots of the reflective layer. Since the balance is never lost and the diffuser plate can be easily molded, high quality and low cost can be realized.

According to the second aspect, the dense and dense arrangement of the halftone dots of the reflection layer provided between the portion other than the display portion of the dial and the diffusion plate is formed by white printing on the back surface of the dial. because there is,
The reflective layer can be arranged around the display portion without causing a shift, and the illumination balance can be improved.

According to the third aspect, the dense and dense arrangement of halftone dots of the reflection layer provided between the diffusion plate and the portion other than the display portion of the dial is formed by aluminum vapor deposition on the back surface of the dial. Therefore, it is possible to arrange the reflection layer around the display unit without causing a shift and improve the illumination balance, and of course, the reflection layer serves as a mirror surface to make the light reflectance uniform in the sparse and dense halftone dots. It is possible to enhance the lighting effect.

According to the present invention, since the display portion of the dial is black-printed so as to be light-transmissive, the brightness of the light transmitted through the display portion is high and the illumination balance of the display portion is good. In addition, the lighting effect can be further improved.

[Brief description of drawings]

FIG. 1 is a sectional perspective view showing an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional explanatory view showing a main part of the embodiment.

FIG. 3 is a schematic cross-sectional explanatory view showing a light transmission state of the embodiment.

FIG. 4 is a schematic cross-sectional explanatory view showing a conventional structure.

[Explanation of symbols]

 1 dial 2 display 2a display 2b close to the light source 2b display far from the light source 3 black printing 4 diffuser 5 reflection layer 6 light source

[Procedure amendment]

[Submission date] February 1, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

[0012]

According to the present invention, since the halftone dot arrangement of the reflective layer is formed around the display portion near the light source, the reflectance of the light incident on the diffuser plate from the light source becomes low, and the light source Illumination is weakened by suppressing the amount of transmitted light in the near display area, and conversely, the reflection layer around the display area distant from the light source has a dense halftone dot pattern, so the light reflected from the light source to the diffuser is reflected. rate is increased, the illumination amount of light transmitted through the far display unit from the light source is increased the strength Merare can take the illumination balance of the display section throughout.

Claims (4)

[Claims] 1. A dial having a light-transmitting display portion and light-impermeable portions other than the display portion, a diffusion plate superposed on the back surface of the dial, and a portion of the dial other than the display portion. A diffuser plate is provided with a reflection layer provided between the diffuser plate and a light source provided at the back of the diffuser plate, and the light from the light source is diffused by the diffuser plate and transmitted through the display portion of the dial to illuminate. In the dial plate illumination structure, the reflection layer is formed as halftone dots in a mesh shape in the plane direction of the diffuser plate, and the halftone dot arrangement around the display unit where the illumination is close to the light source is sparse and far from the light source. A dial illumination structure for instruments, characterized in that the dots are arranged densely around the display where the illumination is dark. 2. The dial illuminating structure for an instrument according to claim 1, wherein sparse and dense arrangement of halftone dots of the reflecting layer is formed by white printing on the back surface of the dial. 3. The dial illuminating structure for an instrument according to claim 1, wherein the halftone dot arrangement of the reflection layer is formed on the back surface of the dial by aluminum vapor deposition. 4. A portion other than the display portion of the dial plate is black-printed on its surface to be light-impermeable, and the display portion is black-printed to be light-transmissive. The dial illumination structure of the instrument according to any one of 3 above.