JP2001255178A - Fluorescent display of meter for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display in clear colors in a bright place and improve a display luminance in a dark place. SOLUTION: This fluorescent display for fluorescent displaying dials 21, 31 and 41 or pointers 22, 32 and 42 of a meter for an automobile is provided with a substrate 101, a white layer as a first layer 111 formed on the substrate 101 and a fluorescent layer as a second layer 112 formed on the white layer of the substrate 101. In the bright place during the daytime or the like, the fluorescent layer scatters and radiates a light of normal colors (non-fluorescent color) specific to the fluorescent layer by a visible light, and part of the light directly emits from a front face of the fluorescent layer. At the same time, the other part of the light proceeds toward the white layer at the side of a rear face of the fluorescent layer, is reflected, and is emitted form the font face of the fluorescent layer. In other words, light advancing to the rear face of the fluorescent layer is radiated from the front face of the fluorescent layer, without being absorbed to the substrate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent display device for displaying an object to be displayed with fluorescent light, and more particularly to a fluorescent device having a two-layer structure in which a white layer or another coloring layer is provided below a fluorescent layer that emits fluorescent light. It relates to a display device. The present invention, for example,
It is preferably used for a meter lighting device that illuminates scales and characters of a dial of an automobile meter such as a speedometer and a tachometer with fluorescent light by using a light emitting diode (hereinafter, referred to as an LED) capable of emitting short-wavelength light. be able to.

[0002]

2. Description of the Related Art A fluorescent display device using a fluorescent substance (broadly defined) such as a fluorescent paint, a luminescent paint, a luminous paint, etc. is used for a sign used at night or in a dark place, a pointer of an instrument, a scale of a dial and characters. used. For example, there is a fluorescent display device in which a coating film of a phosphor is formed on the surface of a substrate of a pointer of an automobile meter, and scales, characters, and the like are formed on the surface of a substrate of a dial by the coating film of the phosphor. This fluorescent display device excites a fluorescent substance by irradiating short wavelength light from a fluorescent lamp or the like at night or the like, and illuminates a pointer or a scale of a dial by emitting fluorescent light. In this case, it is possible to more clearly display the hands, the scales of the dial, and the like with greater luminance than the ordinary visible light illumination, and it is also possible to exhibit a unique illumination effect by the fluorescent color. In recent years, a so-called luminous paint that can extend the afterglow time after the phosphor excitation is stopped and can maintain light emission for a long time has been developed. Such a luminous paint is also generally included in the category of phosphor. included.

[0003]

On the other hand, in a conventional fluorescent display device using a fluorescent material, a single fluorescent layer is used to form a coating film such as a pointer surface and a dial scale. In a light place, this coating film generally shows only a pale yellow-green (blue-white) color, which is a color normally possessed by a phosphor layer composed of a phosphor (hereinafter, referred to as a normal color or a non-fluorescent color). It does not have a clear color as with fluorescent paint. As a result, the colors of the pointers, dial scales and the like in bright places are not clear, and there is room for improvement in terms of visibility. Further, when the coating film is excited by a light source such as a fluorescent lamp in a dark place, it emits light of an emission color having an emission peak wavelength specific to the phosphor used. At this time, since the fluorescent light of the phosphor is absorbed by the substrate on the back surface side of the coating film, the luminance in a dark place may be reduced. Furthermore, the conventional fluorescent display device displays the hands, dial scales, and the like only with the fluorescent color of a single fluorescent layer, so there is a limit in providing various designs, and the design is improved in terms of design. There is room to do it.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fluorescent display device for a vehicle meter which can display a clear color in a bright place and can improve the brightness of the display in a dark place.

Another object of the present invention is to provide a fluorescent display device for a vehicle meter that can improve the design of a display.

[0006]

According to a first aspect of the present invention, there is provided a fluorescent display device for a vehicle meter for fluorescently displaying a dial or hands of the vehicle meter. The fluorescent display device for a vehicle meter includes a substrate, a white layer as a first layer formed on the substrate, and a fluorescent layer as a second layer formed on the white layer of the substrate.

Therefore, in a light place such as daytime, the fluorescent layer scatters and emits light of a normal color (non-fluorescent color) unique to the fluorescent layer by visible light, and a part of the light is emitted by the fluorescent layer. Emit directly from the surface. At the same time, another part of the light travels toward the white layer on the back surface side of the fluorescent layer, is reflected, and is emitted from the surface of the fluorescent layer. That is, light traveling toward the rear surface of the fluorescent layer can be emitted from the front surface of the fluorescent layer without being absorbed by the substrate. Therefore, as compared with the case where there is no white layer on the back surface side of the fluorescent layer, the ordinary color of the fluorescent layer appears more clearly in a light place such as in the daytime, giving an impression that the fluorescent layer appears to float above the white layer.

On the other hand, in a dark place such as at night, the phosphor in the fluorescent layer is excited by light in an excitation wavelength range from a light source (for example, a short-wavelength LED), and a wavelength range (color) specific to the phosphor.
Emits fluorescent light (visible light). At this time, most of the fluorescent light is emitted directly from the surface of the fluorescent layer. At the same time, another part of the fluorescence proceeds to the white layer on the back surface side of the fluorescent layer, is reflected, and is emitted from the surface of the fluorescent layer. That is, the fluorescent light traveling toward the back surface of the fluorescent layer can be emitted from the front surface side of the fluorescent layer without being absorbed by the substrate. Therefore, as compared with the case where there is no white layer on the back side of the fluorescent layer, the brightness of the fluorescent color of the fluorescent layer is increased in a dark place such as at night, and the fluorescent color is more clearly seen.

Furthermore, a part of the light in the excitation wavelength range passes through the fluorescent layer and reaches the white layer. However, the transmitted light is reflected by the white layer and excites the phosphor of the fluorescent layer again. Therefore,
Compared to the case where there is no white layer on the back side of the fluorescent layer, the brightness of the fluorescent color of the fluorescent layer is further increased in a dark place such as at night, and the fluorescent color is seen more clearly.

According to a second aspect of the present invention, there is provided a fluorescent display device for a vehicle meter for fluorescent display of a dial or hands of the vehicle meter. The fluorescent display device of the vehicle meter is formed on the substrate and the substrate, and exhibits white color by visible light.
A first fluorescent layer as a first layer that emits fluorescent light by light in an excitation wavelength range; and a first fluorescent layer formed on the first fluorescent layer of the substrate to exhibit a color other than white by visible light and to be excited. A second fluorescent layer serving as a second layer that emits fluorescent light in response to light in the wavelength range.

Therefore, in a light place such as daytime, the second fluorescent layer scatters and emits light of a normal color (non-fluorescent color) other than white, which is inherent in the fluorescent layer, by visible light. The part emits directly from the surface of the fluorescent layer. At the same time, another part of the light travels to the first fluorescent layer on the back side of the second fluorescent layer. At this time, the first fluorescent layer functions as a normal white layer because it exhibits white by visible light. Therefore, the visible light from the second fluorescent layer is reflected by the first fluorescent layer as a white layer and emitted from the surface of the second fluorescent layer. That is, light traveling toward the rear surface of the second phosphor layer can be emitted from the front surface side of the second phosphor layer without being absorbed by the substrate. Therefore, compared to the case where the first fluorescent layer as a white layer is not provided on the back surface side of the second fluorescent layer, the ordinary color of the second fluorescent layer can be seen more clearly in a light place such as daytime, and the first fluorescent layer can be seen. Gives the impression of appearing above the fluorescent layer.

On the other hand, in a dark place such as at night, the phosphor in the second phosphor layer is excited by light in the excitation wavelength range from the light source, and the fluorescence (visible) in the wavelength range (color) specific to the phosphor is excited. light)
Emits. At this time, most of the fluorescence is directly emitted from the surface of the second fluorescent layer. Further, of the light in the excitation wavelength range from the light source, the light transmitted through the second fluorescent layer excites the phosphor of the first fluorescent layer on the back surface side of the second fluorescent layer. Therefore,
The first fluorescent layer emits fluorescence (visible light) in a wavelength range (color) specific to the phosphor. Then, light composed of the fluorescent color of the first fluorescent layer and the fluorescent color of the second fluorescent layer is emitted from the surface of the second fluorescent layer. For example, when the fluorescent color of the first fluorescent layer and the fluorescent color of the second fluorescent layer are the same color, the fluorescent light of the same color is emitted from both the first fluorescent layer and the second fluorescent layer. Of the image is improved. Therefore, in a dark place such as at night, the brightness of the fluorescent color of the entire fluorescent layer increases, and the fluorescent color can be seen more clearly. Further, for example, when the fluorescent color of the first fluorescent layer and the fluorescent color of the second fluorescent layer are different colors, the first fluorescent layer and the second fluorescent layer emit fluorescence of a mixed color thereof. Therefore, in a dark place such as at night, the brightness of the fluorescent color of the entire fluorescent layer increases, and the fluorescent color can be seen more clearly. Furthermore, the mixed color fluorescence becomes a unique illumination.

According to a third aspect of the present invention, there is provided a fluorescent display device for a vehicle meter according to the second aspect, wherein the first fluorescent layer and the second fluorescent layer emit light of the same fluorescent color by light in an excitation wavelength range. At the same time, the second fluorescent layer emits a chromatic color different from the fluorescent color by visible light.

Therefore, in a light place such as daytime, the second fluorescent layer scatters and emits a chromatic (non-fluorescent) light inherent to the fluorescent layer by visible light. Therefore, the chromatic color of the second fluorescent layer is clearly seen in a light place such as in the daytime. On the other hand, in a dark place such as at night, both the first fluorescent layer and the second fluorescent layer emit the same color of fluorescent light, thereby improving the overall luminance. Therefore, in a dark place such as at night, the brightness of the fluorescent color of the entire fluorescent layer increases, and the fluorescent color can be seen more clearly. The fluorescent color in a dark place is different from the chromatic color in a bright place.

According to a fourth aspect of the present invention, there is provided a fluorescent display device for a vehicle meter for fluorescent display of a dial or hands of the vehicle meter. The fluorescent display device for a vehicle meter includes a substrate, a black layer formed on the substrate, and a fluorescent layer formed on the black layer of the substrate, transmitting visible light and emitting fluorescent light by light in an excitation wavelength range. A fluorescent layer that emits light.

Therefore, in a light place such as daytime, visible light passes through the fluorescent layer, and the black color of the black layer is visually recognized from the outside. On the other hand, in a dark place such as at night, the phosphor in the fluorescent layer is excited by light in the excitation wavelength range from the light source, and emits fluorescence (visible light) in a wavelength range (color) unique to the phosphor. At this time, most of the fluorescence is directly emitted from the surface of the second fluorescent layer.

According to a fifth aspect of the present invention, there is provided a fluorescent display device for a vehicle meter according to any one of the first to fourth aspects, wherein the substrate comprises a pair of transparent substrates, and at least one of the substrates is a transparent substrate. One layer was formed on one substrate, and the second layer was formed on the other transparent substrate, and the pair of substrates was arranged so that the first layer and the second layer overlapped each other.

Therefore, by overlapping a pair of substrates, the first layer and the second layer can be overlapped, and display can be performed by a design of a combination thereof.

[0019]

Embodiments of the present invention will be described below. Throughout the embodiments, the same members or components are denoted by the same reference numerals or numbers, and description thereof is omitted.

FIG. 1 is a front view showing an entire vehicle meter to which the fluorescent display device for a vehicle meter according to each embodiment of the present invention is applied.

The fluorescent display device for a vehicle meter according to each embodiment described below is embodied as a fluorescent display device for fluorescent display of a dial and / or hands of a vehicle meter such as a combination meter. Here, as shown in FIG. 1, the automotive meter to which the fluorescent display device of the present invention is applied includes a meter case (not shown) made of a non-transparent resin, and a facing plate 50 mounted on the front side of the meter case. Is provided. A tachometer section 20 is provided on the left side in the meter case. The tachometer section 20 has a dial 21 and hands 22. Scales and characters are arranged at predetermined intervals on the outer periphery of the dial 21 as a variable display portion 21a indicating the engine speed. Further, a speedometer section 30 is provided at a central portion in the meter case. The speedometer section 30 has a dial 31 and hands 32. On the outer periphery of the dial 31, a variable display section 3 indicating the vehicle speed is provided.
As 1a, scales and characters are arranged at predetermined intervals. Further, an auxiliary meter section 40 in which auxiliary instruments such as a fuel gauge, a voltmeter, and a thermometer are appropriately disposed at a right portion in the meter case.
Is provided. The auxiliary meter unit 40 has a dial 41
And hands 42, 43, and 44 of various instruments. On the dial 41, on the outer peripheral portion of each instrument, the variables of the instrument (remaining fuel amount, battery voltage, cooling water temperature, etc.) are respectively provided.
Are displayed at predetermined intervals as a variable display section 41a that represents.

Next, the configuration of the fluorescent display device of the vehicle meter according to Embodiment 1 of the present invention will be described. FIG. 2 is a sectional view showing the fluorescent display device of the vehicle meter according to Embodiment 1 of the present invention.

The fluorescent display device for a vehicle meter according to the first embodiment includes meter portions 20, 30, and 40 of a vehicle meter.
Dials 21, 31, 41 or hands 22, 32, 42
To 44 are displayed by fluorescence. As shown in FIG. 2, the fluorescent display device for a vehicle meter includes a substrate 101, a first layer 111 formed on the substrate 101, and a second layer 112 formed on the first layer 111 of the substrate 101. Have. The display unit 110 according to the first embodiment is configured by the first layer 111 and the second layer 112.

The board 101 corresponds to the dials 21, 31, 41 of the meter sections 20, 30, 40 of the automobile meter, or the shafts and / or hands of the hands 22, 32, 42, 43, 44. On the other hand, display unit 110 indicates dial 2
1, 31 and 41 correspond to the display portions 21a, 31a and 41a or the display portions of the shaft portions of the hands 22, 32 and 42 to 44 and / or the surface of the hands. The substrate 101 is formed of a polycarbonate (PC) resin or the like. Substrate 101
May be transparent or non-transparent, but is usually non-transparent.

Specifically, as the first layer 111, a white layer made of a white paint is used. The white paint is generally provided by printing or painting in order to form a light scattering surface with an optical system, and includes, for example, a white pigment such as titanium dioxide. In the present embodiment, the first layer 111 made of the white layer is applied and formed at a predetermined position on the substrate 101 with a predetermined film thickness so as to have a predetermined coating plane shape. That is, in the case of the dials 21, 31, and 41, white paint is applied to the substrate 101 at positions corresponding to the scales and the characters on the display units 21a, 31a, and 41a so as to have shapes corresponding to the scales and the characters. Thus, a first layer 111 is formed. In the case of the hands 22, 32, and 42, a white paint is applied to the entire surface of the shaft portion and / or the hand portion to form the first layer 1
11 is formed.

As the second layer 112, a fluorescent layer made of a fluorescent paint is used. The fluorescent paint is, for example, a mixture of a clear paint and a phosphor and a coloring material, and exhibits the color of a coloring material (color pigment, dye) in a bright place, and exhibits the fluorescent color of the phosphor in a dark place. In the present embodiment, the second layer 112 made of the fluorescent layer is formed on the entire surface of the first layer 111 with a predetermined thickness so as to have the same coating plane shape as the first layer 111. .

As the coloring material, any of a coloring pigment and a dye may be used. Either an inorganic pigment or an organic pigment may be used as the color pigment. For example, as a red coloring pigment, iron oxide red, red iron oxide and the like can be used. As the blue color pigment, cobalt blue, ultramarine blue and the like can be used. In the case of a sulfide phosphor, since it has its own body color, it is not necessary to mix a pigment.

As the phosphor of the fluorescent paint, an inorganic phosphor,
Any of the organic phosphors may be used. Also, organic fluorescent
As a body, using either a fluorescent pigment or a fluorescent dye
Is also good. For example, as an inorganic phosphor having a red fluorescent color,
And Y_Two O_Two S: Eu, Y _Two O_Two S: Eu, Sm, Y
VO_Five : An inorganic phosphor such as Eu can be used.
In addition, inorganic phosphors having a green fluorescent color include 3
(Ba, Mg) O · 8Al_Two O_Three : Eu, Mn, Zn_Two 
GeO_Four : Mn, ZnS: Cu, Al, Zn_Two SiO
_Four : Inorganic phosphors such as Mn can be used. Change
In addition, as an inorganic phosphor having a blue fluorescent color, 3 (B
a, Mg) O · 8Al_Two O_Three : Eu, Ca_Two B _Five O₉ C
1: Eu, Sr_Two P_Two O₇ : Uses inorganic phosphor such as Eu
can do. In addition, an organic fluorescent light having a red fluorescent color
As the optical pigment resin, formaldehyde-melamine-
It is possible to use rat toluenesulfonamide copolymer etc.
it can. Furthermore, an organic fluorescent dye having a red fluorescent color is used.
, Basic Violet 82, Basic Red
1, Disperse Yellow 82, Solvent Yellow 1
16 or the like can be used.

The phosphors exemplified above are all
It is excited by light from a light emitting diode (LED) having an emission peak wavelength of about 380 nm and a spectral half width of about 40 nm, and emits light with sufficient luminance. That is, the phosphor has an excitation peak wavelength in the vicinity of about 380 nm, and the display unit 110 using the phosphor performs light emission display with sufficient luminance by the light of the LED having the light emission characteristics.

As a light source of the fluorescent display device according to the present embodiment, outside light such as sunlight is used in a light place. on the other hand,
In the dark place, the dials 21, 3 of the meter units 20, 30, 40
It is preferable to use LEDs provided for 1,41 illumination from the viewpoint of miniaturization, operational stability, long life, and the like. LED
Any LED can be used as long as the phosphor of the fluorescent layer 112 of the display unit 110 can be excited. That is, the LED is selected according to the excitation wavelength of the phosphor used for the fluorescent layer 111. However, in consideration of the influence of ultraviolet irradiation, such as deterioration of the phosphor due to ultraviolet light, it is preferable to use an LED having an emission peak wavelength of about 380 nm and a spectral half width of about 40 nm. Then, for example, an LED as a light source is
It is arranged on the surface side (driver side) of 1, 31, 41, and illuminates the dials 21, 31, 41 surface and hands 22, 32, 42 directly from the front. As a light source, an ordinary ultraviolet lamp or the like can be used in addition to the LED.

To manufacture the fluorescent display device configured as described above, first, a first layer 111 is formed by applying a white paint to a predetermined position on the surface of the substrate 101 by printing or the like. Next, the second layer 112 is formed by applying a fluorescent paint on the surface of the first layer 111 at the predetermined position by printing or the like. Thus, the display unit 110 can be formed at a predetermined position on the substrate 101. The display unit 110 is preferably formed by coating from the viewpoint of cost, productivity, and the like, and can be formed by, for example, screen printing. In this case, since the first layer 111 and the second layer 112 have the same planar shape, printing can be performed using the same plate. Then, the fluorescent display device manufactured as described above is mounted on the meter units 20, 30, and 40 such that the front surface side (the second layer 122 side) of the substrate 101 is in front of the front (driver side).

In the present embodiment, the ordinary color and the fluorescent color of the second layer 112 are arbitrarily set as required. Usually, the second layer 112 is used in order to improve the designability, taste, and the like.
It is preferable that the normal color and the fluorescent color are different colors.

Next, the operation and effect of the fluorescent display device for a vehicle meter according to the first embodiment configured as described above will be described.

First, in a light place such as the daytime, the second layer 112 composed of a fluorescent layer mainly emits visible light components of external light.
Light of a normal color (non-fluorescent color) inherent to the fluorescent layer is scattered and emitted, and a part of the light is directly emitted from the surface of the second layer 112. At the same time, another part of the light travels to the first layer 111 composed of the white layer on the back side of the second layer 112, is reflected, and is emitted from the surface of the second layer 112. That is, light traveling to the rear surface side of the second layer 112 can be emitted from the front surface side of the second layer 112 without being absorbed by the substrate 101. Therefore, compared to a case where there is no white layer as the first layer 111 on the back side of the second layer 112, the ordinary color of the second layer 112 can be seen more clearly in a light place such as daytime, and the white first layer 111
Gives the impression of floating above. As a result, the hands 22, 32, 42 or dial 2 in the light place
The visibility of the display unit 110 including the scales of 1, 31, 41 and the like is improved.

On the other hand, in a dark place such as at night, the phosphor of the second layer 112 is excited by light in the excitation wavelength range from a light source (for example, a short-wavelength LED), and the wavelength range (color ) Emits fluorescence (visible light). At this time, most of the fluorescence is directly emitted from the surface of the second layer 112. At the same time, another part of the fluorescence proceeds to the first layer 111 on the back surface side of the second layer 112, is reflected, and is emitted from the surface of the second layer 112. That is, the fluorescent light traveling to the back side of the second layer 112 can be emitted from the front side of the second layer 112 without being absorbed by the substrate 101. Therefore, compared to the case where the white layer as the first layer 111 is not provided on the back side of the second layer 112, the luminance of the fluorescent color of the second layer 112 is increased in a dark place such as at night, and the fluorescent color is more increased. It looks clear.

Further, as described above, a part of the light in the excitation wavelength range passes through the second layer 112 and reaches the first layer 111.
However, the transmitted light is reflected by the white layer as the first layer 111 and excites the phosphor of the second layer 112 again. Therefore, compared to the case where the first layer 111 is not provided on the back surface side of the second layer 112, the brightness of the fluorescent color of the second layer 112 is further increased in a dark place such as at night, and the fluorescent color is more clearly defined. appear. As a result, even in a dark place, the display unit 1 including the scales of the hands 22, 32, 42 or the dials 21, 31, 41, etc.
The visibility of No. 10 is improved.

Next, the configuration of a fluorescent display device for a vehicle meter according to Embodiment 2 of the present invention will be described. FIG. 3 is a sectional view showing a fluorescent display device for a vehicle meter according to Embodiment 2 of the present invention.

FIG. 3 shows a fluorescent display device according to the second embodiment.
As shown in FIG. 1, first, a pair of substrates 101,
102. The substrate 101 is similar to the substrate of the first embodiment, and is formed of a non-transparent resin material. The substrate 102 is a transparent substrate formed from a transparent resin material. In the present embodiment, the pair of substrates 101, 102
Are dials 21, 31, 41 or hands 22, 32, 4
2, 43 and 44 correspond to the shaft portion and / or the pointer portion.
On the surface (upper surface) of one substrate 101, a first layer 121 is formed. A second layer 1 is provided at a position corresponding to the first layer 121 on the surface (upper surface) of the other transparent substrate 102.
22 are formed. Then, the pair of substrates 101, 1
No. 02 is arranged so as to overlap with each other so that the first layer 121 and the second layer 122 overlap each other. The first layer 121 and the second layer 122 form the display unit 120 of the second embodiment. The display unit 120 includes dials 21, 31, 4
1 display units 21a, 31a, 41a or hands 22, 3
2, 42 to 44 correspond to the display surface of the surface of the shaft portion and / or the pointer portion.

More specifically, the first layer 121 is formed of a first fluorescent layer that exhibits white light by visible light and emits fluorescent light by light in the excitation wavelength range. The first layer 121 is made of, for example, a first fluorescent paint in which an arbitrary phosphor and an arbitrary white pigment are blended, and exhibits a white color which is the color of the white pigment in a bright place, and a fluorescent color of the phosphor in a dark place. Present. In the present embodiment, the first layer 121 made of the first fluorescent layer is formed in a predetermined coating plane shape at a predetermined position on the surface of the substrate 101 in the same manner as the first layer 111 of the first embodiment. As shown in FIG.

The second layer 122 is formed on the first layer 121 of the substrate 102. The second layer 122 has a color other than white by visible light and emits fluorescent light by light in the excitation wavelength range. Consists of The second layer 122 is made of, for example, a second fluorescent paint in which an arbitrary phosphor and an arbitrary chromatic pigment are blended, and exhibits a chromatic color which is the color of the chromatic pigment in a light place, and a fluorescent substance in a dark place. Of fluorescent color. In the present embodiment, the second layer 122 composed of the second fluorescent layer is
On the surface of No. 02, a predetermined thickness is applied at a position completely corresponding to the first layer 121 so as to have the same coating plane shape as the first layer 121.

As the light source of the fluorescent display device according to the present embodiment, the same light source (LED or the like) as in the first embodiment can be used.

In order to manufacture the fluorescent display device configured as described above, first, a first fluorescent coating is applied to a predetermined position on the surface of the substrate 101 by printing or the like to form the first layer 121. Next, the second layer 122 is formed by applying a second fluorescent paint to a predetermined position on the surface of the substrate 102 by printing or the like.
Then, the substrates 101 and 102 are bonded and fixed to each other in an overlapping state so that the first layer 121 and the second layer 122 completely overlap. At this time, in FIG. 3, a gap is formed between the substrates 101 and 102 by the thickness of the first layer 121, but in reality, the thickness of the first layer 121 is very small. It is in a substantially adhered state, and can be easily handled in the same manner as a single substrate. Thus, the display unit 120 can be formed at a predetermined position on the substrates 101 and 102. The display unit 120 is formed by coating in the same manner as in the first embodiment. And the substrate 10
1, 102 are meter units 20, 30, 4 so that the substrate 102 side (second layer 122 side) is in front of the front (driver side).
0.

In the present embodiment, the fluorescent color of the first layer 121 composed of the first fluorescent layer is arbitrarily set as needed. Further, the normal color and the fluorescent color of the second layer 122 composed of the second fluorescent layer are arbitrarily set as needed. Normally, it is preferable that the fluorescent color of the first layer 121 be the same as the fluorescent color of the second layer 122 in order to improve luminance, visibility, and the like. Further, it is preferable that the normal color and the fluorescent color of the second layer 122 be different colors in order to improve the design property, the taste, and the like. For example, the normal color of the first layer 121 is white and the fluorescent color is green, and the normal color of the second layer 122 is red and the fluorescent color is green. In this way, in a bright place, the display section 120 is clearly displayed by the red color of the second layer 122, and in a dark place, the display section 120 is clearly displayed with high brightness by the green color of the first layer 121 and the second layer 122. can do.

Next, the operation and effects of the fluorescent display device for a vehicle meter according to the second embodiment configured as described above will be described.

First, in a light place such as the daytime, the second layer 122 composed of the second fluorescent layer mainly emits a chromatic color (other than white) unique to the second fluorescent layer due to the visible light component of the external light. (A non-fluorescent color), and a part of the light is
Exits directly from the surface. At the same time, another part of the light passes through the transparent substrate 102 and proceeds to the first layer 121 made of the first fluorescent layer on the back surface side of the second layer 122. At this time, since the first layer 121 presents white by visible light,
Functions as a normal white layer. Therefore, the visible light from the second layer 122 is reflected by the first layer 121 as a white layer and emitted from the surface of the second layer 122. That is, the second layer 1
The light traveling toward the rear surface of the second layer 122 can be emitted from the front surface of the second layer 122 without being absorbed by the substrate 101. Therefore, compared with the case where the first layer 121 as a white layer is not provided on the back surface side of the second layer 122, the chromatic color of the second layer 122 is more clearly seen in a light place such as daytime, and the first layer 12 is
It gives an impression that it appears to float on the white layer of No. 1. As a result, the display unit 12 composed of the scales of the hands 22, 32, 42 or the dials 21, 31, 41 in the light place, etc.
0 visibility is improved.

On the other hand, in a dark place such as at night, the phosphor in the second layer 122 is excited by the light in the excitation wavelength range from the light source, and the fluorescence (visible light) in the wavelength range (color) unique to the phosphor is excited. )
Emits. At this time, most of the fluorescence is transmitted to the second layer 122.
Exits directly from the surface. Further, of the light in the excitation wavelength range from the light source, the light transmitted through the second layer 122 is reflected by the second layer 12.
2 excites the phosphor of the first layer 121 on the back side. Therefore, the first layer 121 emits fluorescence (visible light) in a wavelength range (color) specific to the phosphor. Then, light composed of the fluorescent color of the first layer 121 and the fluorescent color of the second layer 122 is transmitted to the second layer 12.
2 from the surface.

At this time, in the present embodiment, the first layer 12
Since the first fluorescent color and the fluorescent color of the second layer 122 are the same color, both the first layer 121 and the second layer 122 emit fluorescent light of the same color, and the overall luminance is improved. Therefore, in a dark place such as at night, the luminance of the fluorescent color of the first and second fluorescent layers or the entire display unit 120 increases, and the fluorescent color can be seen more clearly. As a result, guideline 2 even in dark places
The visibility of the display unit 120 including the scales of the dials 32, 32, 42 or the dials 21, 31, 41 can be improved. Further, in the display unit 120, the fluorescent color in a dark place is
The color is different from the chromatic color in the light place. As a result, it is possible to change colors in a light place and a dark place, and to exert a unique design effect.

In the second embodiment, the pair of substrates 10
The first layer 121 made of the first fluorescent layer (white fluorescent layer) and the second layer 122 made of the second fluorescent layer (chromatic fluorescent layer) are overlapped by joining the first and second layers 102 and 102 together. The display unit 120 is configured. Therefore, the second layer 122
Of the display unit 120 by changing the type (fluorescent color) of the
The fluorescent color as can be easily changed. As a result, a large number of substrates 102 on which the second layer 122 formed of the chromatic fluorescent layers of different colors are formed are prepared and appropriately combined with the substrate 101 on which the first layer 121 formed of the first fluorescent layer (white fluorescent layer) is formed. , The hands 22, 32, 42, and the dial 2 by the display unit 120 of various designs (fluorescent colors)
Display such as scales of 1, 31, 41 can be performed.

In the second embodiment, the first layer 121 and the second layer 122 have the same fluorescent color. However, for example, the fluorescent colors may be different. In this case, the first layer 121 and the second layer 122 emit the mixed color fluorescent light. Therefore, the luminance of the fluorescent color of the entire fluorescent layer is increased in a dark place such as at night, and the fluorescent color is more clearly seen, and the mixed color fluorescent light is a unique illumination. As a result, even in a dark place, visibility such as a scale of a pointer or a dial is improved, and further, a unique illumination effect by mixed light of the fluorescent color of the first layer 121 and the fluorescent color of the second layer 122 is exhibited. be able to.

In this alternative example, the first layer 121 and the second layer 1
The display on the display unit 120 can be performed with a fluorescent color (mixed color) that changes according to the combination of the 22 fluorescent colors. As a result, by preparing a large number of substrates 101 and 102 each having the first layer 121 and the second layer 122 formed of the chromatic fluorescent layers of different colors, and appropriately combining the substrates 101 and 102, a variety of designs ( Mixed fluorescent color)
Can display the scales and the like of the hands 22, 32, 42 and the dials 21, 31, 41.

Further, in the second embodiment, at least the substrate 102 on the second layer 122 side needs to be a transparent substrate, but the substrate 101 on the first layer 121 side can also be a transparent substrate. In this case, a skeleton effect that makes the internal structure visible can be exerted.

Next, the configuration of a fluorescent display device for a vehicle meter according to Embodiment 3 of the present invention will be described. FIG. 4 is a sectional view showing a fluorescent display device of a vehicle meter according to Embodiment 3 of the present invention.

The fluorescent display device according to the third embodiment includes a substrate 102 and a first layer 131 formed on the back surface of the substrate 102.
And a second layer 132 formed on the first layer 131 on the surface of the substrate 102. First layer 13
The display unit 13 of the third embodiment is formed by the first and second layers 132.
0 is configured. The display unit 130 has dials 21 and 3
1, 41 display portions 21a, 31a, 41a or hands 2
2, 32, 42 to 44 correspond to the display surface of the surface of the shaft portion and / or the pointer portion.

Specifically, as the first layer 131, a black layer made of a black paint is used. The black paint is generally provided by printing or painting to form a mask surface with an optical system, and includes, for example, a black pigment such as carbon black. In the present embodiment, the first layer 131 composed of a black layer is formed into a predetermined coating plane shape at a predetermined position on the back surface of the substrate 102 in the same manner as the first layer 111 of the first embodiment. The coating is formed thick.

As the second layer 132, of the fluorescent paint,
A fluorescent layer made of a fluorescent paint used as a transparent thin-film phosphor for banknote identification is used so that the phosphor becomes transparent in a bright place and has a fluorescent color of the phosphor in a dark place. That is, the second layer 132 uses a fluorescent paint that transmits visible light and emits fluorescent light by light in the excitation wavelength range.
The second layer 132 becomes a transparent layer in a bright place, and emits fluorescent light in a dark place. In the present embodiment, the second layer 132 made of the fluorescent layer is placed on the surface of the substrate 102 at a position (overlapping position) that completely corresponds to the first layer 131, and has the same coating plane shape as the first layer 131. It is applied and formed with a predetermined film thickness so that

As the light source of the fluorescent display device according to the present embodiment, the same light source (LED or the like) as in the first embodiment can be used.

In order to manufacture the thus constructed fluorescent display device, first, a black paint is applied to a predetermined position on the back surface of the substrate 102 by printing or the like to form the first layer 131. Next, a fluorescent paint is applied to a predetermined position on the surface of the substrate 102 by printing or the like to form the second layer 132. This allows
The display unit 130 can be formed at a predetermined position on the substrate 102. The display unit 130 is formed by coating in the same manner as in the first embodiment. And the substrate 102 is the substrate 10
2 front side (second layer 132 side) is front front (driver side)
So as to be assembled to the meter units 20, 30, and 40.

In the present embodiment, the normal color and the fluorescent color of the second layer 132 are arbitrarily set as needed. Normally, the second layer 132 is used to improve the design and taste.
It is preferable that the normal color and the fluorescent color are different colors.

Next, the operation and effect of the fluorescent display device for a vehicle meter according to the third embodiment configured as described above will be described.

First, in a light place such as daytime, external light (visible light) passes through the second layer 132 made of a fluorescent layer, and the black color of the first layer 131 made of a black layer is visually recognized from the outside. On the other hand, in a dark place such as at night, the phosphor of the second layer 132 made of the fluorescent layer is excited by the light in the excitation wavelength range from the light source, and the fluorescence (visible) in the wavelength range (color) specific to the phosphor is excited. light)
Emits. At this time, most of the fluorescence is
Exits directly from the surface.

As a result, the hands 22 and 3 have a unique atmosphere design that exhibits a black color in a light place and a fluorescent color in a dark place.
Display unit 1 such as 2, 42, scales of dials 21, 31, 41
30 is displayed, and the design of the display can be improved.

Incidentally, in the first embodiment, the substrate 101
Embodiment 2 in which a white layer and a fluorescent layer are laminated on the surface of
In the third embodiment, a white fluorescent layer and a chromatic fluorescent layer are formed on a pair of substrates 101 and 102, respectively.
02, a fluorescent layer and a black layer were formed on the front and back surfaces. However, in the present invention, the first layer and the second layer can be formed on the substrate in any mode as long as the first layer and the second layer overlap each other to form a display unit. For example, the white fluorescent layer and the chromatic fluorescent layer of the second embodiment, or the black layer and the fluorescent layer of the third embodiment may be formed on the surface of the substrate 101 of the first embodiment. Alternatively, Embodiment 2
The white layer and the fluorescent layer of the first embodiment, or the black layer and the fluorescent layer of the third embodiment may be formed on the pair of substrates 101 and 102. Alternatively, the substrate 102 according to the third embodiment
A white layer and a fluorescent layer according to the first embodiment,
Alternatively, the white fluorescent layer and the chromatic fluorescent layer of the second embodiment may be formed. Alternatively, another combination of the first layer and the second layer may be formed on the front surface or the back surface of one substrate 101 or the substrate 102, or a pair of the substrates 101 and 102.
May be formed.

In each of the above embodiments, the second layer 11
2, 122, 132 are the fluorescent layers, and the first layers 111, 12
Although 1,131 is a white layer, a white fluorescent layer or a black layer, the present invention may be embodied as a chromatic fluorescent layer for both the first layer and the second layer. For example, the first layer and the second layer,
It may be formed to have the same ordinary color and different chromatic fluorescent colors. In this case, the display unit, in a light place,
In the dark place, the display is performed by mixing the fluorescent colors of the first layer and the second layer in the dark place, so that the display variation can be increased.

In this case, as in the second embodiment,
The display unit may be configured by forming the first layer and the second layer on the pair of substrates 101 and 102 and overlapping them. In this case, by changing one of the types (fluorescent color) of the first layer and the second layer, the fluorescent color of the display unit can be easily changed.

Further, as the light source of the fluorescent display device of the present invention, any one can be used as described above. However, when an LED is used as a light source, there is an effect that power consumption is small, light emission does not involve heat generation, and space can be saved as compared with a normal ultraviolet lamp. On the other hand, an LED is a relatively small light source, and the irradiation range of light may be small, and there is room for consideration in terms of illumination uniformity. However, in the lighting device of this configuration, the dial 2
Since the display portions 21a, 31a, and 41a of 1, 31, and 41 are displayed with fluorescent light, uniformity can be easily obtained. As a result, the hands 22, 32, 42 and the dials 21, 31, 41 can be efficiently used with a small number of LEDs.
Etc. can be uniformly illuminated.

The LED capable of emitting light in the short wavelength range includes not only a normal short wavelength LED emitting light in only the short wavelength range, but also
Visible light short wavelength LED that can emit light in short wavelength range and visible light range
Can also be used. Further, as light in a short wavelength range by the LED, ultraviolet light having an emission peak wavelength of about 380 nm and a spectral half width of about 40 nm is preferable. With light (ultraviolet light) having a shorter wavelength than this, there is a possibility that problems such as early deterioration of the resin material such as the dials 21, 31, 41 and the fluorescent paint may occur. On the other hand, for light of a longer wavelength,
There is a possibility that the phosphor is not sufficiently excited, and the graduation of the dial and the fluorescence emission of the character are weakened. For example, an aluminum gallium nitride (Al _x Ga ₁ -xN) -based LED can be used as the LED capable of emitting light having a short wavelength.

The term “fluorescence” used in the present specification means “phosphorescence” in addition to “fluorescence” in a narrow sense. It is used in a broad sense including “light storage”, that is, “luminescence”. As the phosphor of the present invention, other than those exemplified in the above embodiment, any phosphor can be used as long as it can emit a desired fluorescent color.

Further, in the present invention, the first layer and the second layer may be made different from each other without having the same area (the same plane shape). For example, the second layer is formed of the transparent phosphor as in the third embodiment, and has a larger area than the first layer and extends outward from the outer periphery of the first layer. In this way, in a bright place, the ordinary color of the first layer is visually recognized, and in a dark place, a part which is not visually recognized in the bright place is visually recognized by the fluorescent light, so that a unique design effect can be exhibited.

Further, in the present invention, an infrared-excited phosphor may be used to emit visible light by infrared rays.

[0070]

According to the present invention, the fluorescent display device for a vehicle meter according to the present invention is constructed as described above. This gives the impression that the ordinary color of the color is more clearly visible and appears above the white layer. As a result, the visibility of a pointer or dial scale in a light place is improved.

On the other hand, the brightness of the fluorescent color of the fluorescent layer is increased in a dark place such as at night, and the fluorescent color can be seen more clearly than in the case where there is no white layer on the back side of the fluorescent layer. As a result, even in a dark place, the visibility of the pointer or the dial scale is improved.

Since the fluorescent display device for a vehicle meter according to claim 2 is configured as described above, the fluorescent display device according to the second embodiment has a structure in which the first fluorescent layer as a white layer is not provided on the back side of the second fluorescent layer. In a light place such as during the daytime, the ordinary color of the second fluorescent layer looks clearer, giving an impression that the second fluorescent layer appears to rise above the first fluorescent layer. As a result, the visibility of a pointer or dial scale in a light place is improved.

On the other hand, in a dark place such as at night, the brightness of the fluorescent color of the entire fluorescent layer increases, and the fluorescent color can be seen more clearly. Also, for example, when the fluorescent color of the first fluorescent layer and the fluorescent color of the second fluorescent layer are different colors, the first fluorescent layer and the second fluorescent layer
The fluorescent layers emit fluorescent light of the mixed colors. Therefore, the mixed color fluorescence becomes a unique illumination.
As a result, even in a dark place, the visibility such as the scale of the hands or the dial is improved, and the fluorescent color of the first fluorescent layer and the second color are also improved.
A unique illumination effect due to the mixed light of the fluorescent colors of the fluorescent layers can be exhibited.

According to the third aspect of the present invention, the fluorescent display device for a vehicle meter is configured as described above. In addition to the effect of the second aspect, the chromatic color of the second fluorescent layer can be clearly seen in a light place such as daytime. . On the other hand, in a dark place such as at night, the brightness of the fluorescent color of the entire fluorescent layer is increased, and the fluorescent color is seen more clearly.
The fluorescent color in a dark place is different from the chromatic color in a bright place. As a result, it is possible to improve the visibility of the pointer or the scale of the dial even in a dark place, and to change the colors in the light place and the dark place, thereby exhibiting a unique design effect.

According to the fourth aspect of the present invention, the fluorescent display device for a vehicle meter is configured as described above. Therefore, the design of the hands and the dial is made by a unique atmosphere design that exhibits black color in a bright place and fluorescent color in a dark place. Or the like can be displayed, and the design of the display can be improved.

According to a fifth aspect of the present invention, the fluorescent display device for a vehicle meter is configured as described above. In addition to the effects of the first to fourth aspects, a white layer and a white fluorescent layer (first fluorescent layer) are provided. Along with preparing a substrate on which various first layers are formed, such as a black layer, a fluorescent layer, a second fluorescent layer, etc., a large number of transparent substrates are formed on which a second layer having a variety of fluorescent colors is formed. By appropriately combining these, it is possible to display a pointer, a dial scale, and the like with a variety of designs.

[Brief description of the drawings]

FIG. 1 is a front view showing an entire automotive meter to which a fluorescent display device for a vehicle meter according to each embodiment of the present invention is applied.

FIG. 2 is a sectional view showing a fluorescent display device of the vehicle meter according to Embodiment 1 of the present invention.

FIG. 3 is a sectional view showing a fluorescent display device of a vehicle meter according to Embodiment 2 of the present invention.

FIG. 4 is a sectional view showing a fluorescent display device of a vehicle meter according to Embodiment 3 of the present invention.

[Explanation of symbols]

21 dial, 31 dial, 41 dial, 22 pointer, 32 pointer 42 pointer, 43 pointer, 101, 102 substrate, 11
1, 121, 131 first layer, 112, 122, 132
Second layer

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masato Tamaki 1 Ochiai Ochiai, Kasuga-cho, Nishi-Kasugai-gun, Aichi Prefecture Inside Toyoda Gosei Co., Ltd. (72) Inventor Yoshinori Asano 2-705-7-20 Komatsudai, Hanyu City, Saitama Prefecture Jujo Chemical Co., Ltd. (72) Inventor Yozo Nishiguchi 2-19-12 Dai, Kamakura-shi, Kanagawa F-term in Shinro Ihi Co., Ltd. FF01 5G435 AA01 AA03 BB01 CC04 CC12 FF11 HH06 LL17

Claims (5)

[Claims] 1. A fluorescent display device of a vehicle meter for fluorescently displaying a dial or a pointer of a vehicle meter, the substrate comprising: a substrate; a white layer as a first layer formed on the substrate; A fluorescent display device for a vehicle meter, comprising: a fluorescent layer as a second layer formed on a white layer. 2. A fluorescent display device of a vehicle meter for fluorescently displaying a dial or a pointer of a vehicle meter, comprising: a substrate; formed on the substrate; A first fluorescent layer serving as a first layer that emits fluorescent light by light; and a light in an excitation wavelength range formed on the first fluorescent layer of the substrate and having a color other than white by visible light. And a second fluorescent layer as a second layer that emits fluorescent light. 3. The first fluorescent layer and the second fluorescent layer,
While emitting light of the same fluorescent color by light in the excitation wavelength range,
The fluorescent display device for a vehicle meter according to claim 2, wherein the second fluorescent layer presents a chromatic color different from the fluorescent color by visible light. 4. A fluorescent display device for a vehicle meter for fluorescently displaying a dial or a pointer of a vehicle meter, the substrate comprising: a substrate; a black layer formed on the substrate; and a black layer formed on the black layer of the substrate. And a fluorescent layer that transmits visible light and emits fluorescent light by light in an excitation wavelength range. 5. The method according to claim 1, wherein the substrate comprises a pair of substrates, at least one of which is a transparent substrate, the first layer is formed on one substrate, and the second layer is formed on the other transparent substrate. The pair of substrates is arranged so as to overlap with each other so that the layer and the second layer overlap each other (the areas of the first layer and the second layer are different, and a portion not lit in a bright place is lit in a dark place). The fluorescent display device according to claim 1.