JPH08122104A - Meter - Google Patents

Abstract

PURPOSE: To make a pointer or dial to be invisible from the outside by matching the peak wavelength of surface reflecting property of at least one or both of the pointer and dial with the wavelength of a smoked glass with low transmissivity. CONSTITUTION: A smoke glass 3 is fixed on a black dial trim plate 12 or a case 7, covering a pointer 1 and dial 2, and it is set in advance as to have spectral characteristics with a specified wavelength and transmissivity. The reflection factor of a reflection layer for specified wavelength becomes high against external optical component having a wavelength of at most 400nm. However, since the transmissivity of the glass 3 is low, a light quantity transmitting the glass 3 decreases, so the pointer 1 and dial 2 are difficult to be seen. On the other hand, the reflection factor thereof is 0% against the external optical component having a wavelength of at least 400nm, so the pointer 1 and dial 2 cannot be seen at all. Therefore, in the case where the light is turned off or the external light is strong, the pointer 1 and dial 2 are difficult to be seen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an instrument, and more particularly to a vehicle having a pointer that emits light from a light emitting element, a dial that emits light from a lamp, and a smoked glass that covers the pointer and the dial. Related to speedometers and other measuring instruments.

[0002]

2. Description of the Related Art This type of instrument uses the low transmittance of smoked glass so that the pointer and dial cannot be seen from the outside when the light-emitting element and the lamp are not supplied with power, and the indicator and the dial are not visible from outside. It is characterized in that the pointer and dial face appear to float when the light is turned on.

[0003]

However, since the luminous intensity of the light emitting element and the lamp is limited, the transmittance of the smoked glass is also limited. Therefore, when the ambient light is strong, the smoked glass is not exposed to the ambient light. There is a problem in that it is transparent and the pointer and dial are visible from the outside, and it is difficult to make full use of the above characteristics.

The present invention solves the above-mentioned problems and provides a measuring instrument which makes it possible to make full use of the characteristics of the pointer or dial so that it cannot be seen from the outside even when the external light is strong. With the goal.

[0005]

According to a first aspect of the present invention, there is provided an instrument having a pointer which emits light from a light emitting element, a dial which emits light from a lamp, and a smoked glass which covers the pointer and the dial. , The peak wavelength of the surface reflection characteristics of either or both of the pointer or dial,
An instrument is adopted which is set so as to match the wavelength of the smoke glass having a low transmittance.

According to a second aspect of the invention, the instrument according to the first aspect is adopted, wherein the surface reflection characteristic is obtained by a material of the pointer or the dial.

According to a third aspect of the present invention, the instrument according to the first aspect is adopted, wherein the surface reflection characteristic is obtained by a specific wavelength reflection layer provided on the surface of the pointer or the dial.

According to a fourth aspect of the present invention, in an instrument having a pointer whose colored surface emits light due to light from the light emitting element and smoke glass which covers the pointer, an emission peak wavelength of the light emitting element and a reflection peak wavelength of the pointer colored surface. An instrument is adopted which is characterized in that and are substantially equal.

[0009]

According to the instrument of the first aspect of the present invention, the peak wavelength of the surface reflection characteristic of either or both of the pointer and the dial coincides with the wavelength of smoke glass having a low transmittance. Since the external light component near the peak wavelength has a low transmittance of smoked glass, the amount of light reaching the pointer or dial is small, and the external light component deviating from the vicinity of the peak wavelength is the amount of light passing through the smoked glass. Even if there is a large amount, it will not be reflected on the surface of the pointer or dial. For this reason, even if the outside light is strong when the light is turned off, the pointer or dial is difficult to see from the outside, and the features of the instrument can be fully utilized.

The instrument according to claim 2 is such that the surface reflection characteristics can be obtained by the material itself of the pointer or dial.

According to a third aspect of the present invention, the surface reflection characteristic can be obtained with a specific wavelength reflection layer.

According to the instrument of claim 4, since the emission peak wavelength of the light emitting element and the reflection peak wavelength of the pointer coloring surface are substantially equal to each other, the brightness of the pointer at the time of lighting becomes high. For this reason,
It becomes possible to set the transmittance of the smoked glass to be low, and it becomes difficult for the pointer to be seen from the outside even when the outside light is strong when the light is turned off.

[0013]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 schematically shows the configuration of an instrument according to one embodiment.

In FIG. 1, 1 is a pointer, 2 is a dial, and 3
Represents smoked glass.

The pointer 1 is a transparent resin molded product made of polycarbonate, acrylic resin or the like. A colored surface 4 (FIG. 2) colored by a hot stamp or the like is provided on the lower surface of the pointer 1. Further, a specific wavelength reflecting layer 5 (FIG. 2) formed by printing, vapor deposition, sputtering, or the like is provided on the upper surface and both side surfaces of the pointer 1. Guideline 1
A light emitting element 6, for example, an LED or a lamp is disposed on the base portion 1a of the. The light emitting element 6 illuminates the colored surface 4 on the lower surface of the pointer 1 to cause the pointer 1 to emit light. The base 1a of the pointer 1 is connected to the shaft 9 of the inner unit 8 attached to the white case 7, and the pointer 1 is rotated by the inner unit 8.

The dial 2 is constructed as shown in FIG. 3 or 4. The dial 2 shown in FIG. 3 is a substrate 2 formed of a transparent resin such as polycarbonate or acrylic.
1, a specific wavelength reflecting layer 22 formed on the upper surface of the substrate 21 by printing, vapor deposition, sputtering or the like, and a black layer 23 formed on the upper surface of the specific wavelength reflecting layer 22 by printing or the like. On the other hand, the dial 2 shown in FIG. 4 includes a substrate 21 formed of a transparent resin such as polycarbonate or acrylic, a black layer 23 formed on the upper surface of the substrate 21 by printing or the like, the black layer 23 and the substrate 21. And a specific wavelength reflecting layer 22 formed by printing, vapor deposition, sputtering or the like on the upper surface of the.

A diffusion plate 10 is arranged on the back surface of the dial plate 2. The diffusion plate 10 is made of a resin such as polycarbonate and is fixed to the dial plate 2 by heat staking or the like. The diffusion plate 10 is the lamp 1 arranged in the case 7.
The light from 1 is diffused and the dial 2 is illuminated from the back side. The lamp 11 is composed of a xenon lamp or a cold cathode tube.

The smoked glass 3 includes a pointer 1 and a dial 2.
It is fixed to the black dial plate 12 or the case 7 so as to cover the. The smoked glass 3 is formed of a transparent resin such as acrylic or polycarbonate. The smoked glass 3 is preset so as to have a spectral characteristic of the relationship between wavelength and transmittance as shown in FIG. 5, FIG. 6 or FIG.

Next, the relationship between the specific wavelength reflection layers 5 and 22 of the pointer 1 and the dial plate 2, the smoked glass 3, the light emitting element 6 and the lamp 11 will be described with reference to FIGS.

As shown in FIG. 5, wavelengths of 400 to 700n
The transmittance is about 30% at m, and the transmittance decreases proportionally as the wavelength decreases below 400 nm.
When the smoked glass 3 is made so that the transmittance increases proportionally as the wavelength increases at 0 nm or more, only the light near the wavelength of 200 nm at which the smoked glass 3 has a low transmittance is reflected, in other words, the reflection peak. Wavelength is 2
The specific wavelength reflecting layers 5 and 22 are formed so as to have a wavelength of around 00 nm. The light emitting element 6 and the lamp 11 each have an emission wavelength within a wavelength range of 400 to 700 nm.

With this configuration, the wavelength is 4
The reflectance of the specific wavelength reflecting layers 5 and 22 is high with respect to the external light component of 00 nm or less, but the transmittance of the smoked glass 3 is low, so that the amount of light transmitted through the smoked glass 3 is reduced and the pointer is used. 1 and dial 2 are hard to see from the outside. On the other hand, with respect to the external light component having a wavelength of 400 nm or more, the reflectance of the specific wavelength reflection layers 5 and 22 is 0%, so that the pointer 1 and the dial 2 cannot be seen from the outside. Therefore,
Even when external light is strong when the light is turned off, the pointer 1 and the dial 2 are difficult to see from the outside. In addition, at the time of lighting, as described above, the reflection peak wavelength of each of the specific wavelength reflecting layers 5 and 22 is near 200 nm, and each of the light emitting wavelengths of the light emitting element 6 and the lamp 11 is in the range of 400 to 700 nm. The specific wavelength reflection layers 5 and 22 do not interfere with the light emission of the pointer 1 and the dial 2.

On the other hand, as shown in FIG. 6, the wavelength is 500 nm.
When the smoked glass 3 having a low transmittance of about 20% in the vicinity is formed, the specific wavelength reflection layers 5 and 22 are formed so that the reflection peak wavelength is around 500 nm.

With this configuration, as in the case shown in FIG. 5 described above, even when the external light is strong when the light is turned off,
The pointer 1 and the dial 2 are difficult to see from the outside.

FIG. 7 shows the relationship between the luminous intensity of the light emitting element 6, the reflectance of the colored surface 4 of the pointer 1 and the transmittance of the smoked glass 3 in the instrument according to another embodiment.

As shown in FIG. 7, the light emitting element 6 has a light emission peak wavelength of around 500 nm, and the colored surface 4 has a reflection peak wavelength around 500 nm which is substantially equal to the light emission peak wavelength. Has been created. Therefore, the brightness of the pointer 1 at the time of lighting becomes high, and the transmittance of the smoked glass 3 can be set to about 20%, that is, lower than that shown in FIG. Therefore, even when the external light is strong, the pointer 1 is difficult to see from the outside.

Although not shown, as another embodiment, the specific wavelength reflecting layers 5 and 22 are eliminated and the pointer 1 itself and the dial 2 themselves are made of a material having a characteristic of reflecting a specific wavelength. You may do it.

As described above, according to each of the above-described embodiments, even if the outside light is strong when the light is turned off, the pointer or dial is difficult to see from the outside, and the characteristic of the instrument can be fully utilized. Like

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an instrument according to an embodiment.

FIG. 2 shows a structure of a pointer, FIG. 2 (A) is a side view, and FIG.
2B is a sectional view taken along the line BB in FIG. 2A.

FIG. 3 shows the structure of a dial, FIG. 3 (A) is a front view, FIG. 3 (B) is a cross-sectional view taken along line BB in FIG. 3 (A).

FIG. 4 is a sectional view of a dial according to another embodiment.

FIG. 5 is a graph showing the relationship between the transmittance of smoked glass and the reflectance of a specific wavelength reflective layer.

FIG. 6 is a graph showing the relationship between the transmittance of smoked glass and the reflectance of a specific wavelength reflective layer according to another example.

FIG. 7 is a graph showing the relationship between the reflectance of the colored surface of the pointer, the luminous intensity of the light emitting element, and the transmittance of smoked glass according to another example.

[Explanation of symbols]

 1 pointer 2 dial plate 3 smoked glass 4 colored surface 5,22 specific wavelength reflective layer 6 light emitting element 11 lamp

Claims (4)

[Claims] 1. An instrument having a pointer that emits light from a light-emitting element, a dial that emits light from a lamp, and smoked glass that covers the pointer and the dial, wherein either the pointer or the dial is present. An instrument characterized in that one or both of the peak wavelengths of the surface reflection characteristics are set to match the wavelength of the smoke glass having a low transmittance. 2. The instrument according to claim 1, wherein the surface reflection characteristic is obtained by a material of the pointer or the dial. 3. The instrument according to claim 1, wherein the surface reflection characteristic is obtained by a specific wavelength reflection layer provided on the surface of the pointer or the dial. 4. An instrument having a pointer whose colored surface emits light by light from a light emitting element and smoke glass which covers the pointer, wherein an emission peak wavelength of the light emitting element and a reflection peak wavelength of the pointer colored surface are substantially equal to each other. An instrument characterized by equalization.