JPH11283415A - Luminaire and display device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow easy manufacturing and to provide high-efficiency, highly transparent light emission for use in various applications. SOLUTION: A black light 2 outputs near ultraviolet rays whose peak wavelengths are from about 350 to 360 nm. A front cover 5 as made of fluorescent glass composed base body of an amorphous inorganic compound to which ions serving as a luminescence center are added. The front cover 5 is made to emit light when excited by the near ultraviolet rays radiated from the black light 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting fixture and a display device using the same.

[0002]

2. Description of the Related Art Conventionally, various types of light sources and light-emitting devices have been developed and put to practical use, and are used for lighting and display applications. Numerous light-emitting materials are used for these light sources and light-emitting devices, and a typical one is a phosphor. The phosphor is based on various crystals,
The matrix is formed by doping various luminescent ions serving as luminescent centers, and exhibits luminescence peculiar to the luminescent ions by external excitation energy. These phosphors are used for lighting applications such as fluorescent lamps and fluorescent mercury lamps, cathode ray tubes, fluorescent display tubes, and EL displays.
It is used in a wide variety of applications, such as video and display applications for panels, and as an X-ray sensitizer (see, for example,
No. 55496).

[0003]

The above-mentioned phosphor is generally in the form of a powder, and is used after being coated on an appropriate position of a light source or a light-emitting device. Although the phosphor has a slight body color depending on the type, alumina (Al) used as a pigment is basically used as a pigment.
₂ O ₃₎ and titania (for TiO ₂₎ is the same as white and the like is opaque to visible range can not be obtained only superficial emission, the therefore opacity unsuitable use applications There was a problem that it was not possible.

[0004] Further, since the phosphor is in a powder form, the phosphor is prepared as a coating solution together with an appropriate solvent, an organic binder for obtaining a suitable viscosity, and the like, and is then applied to an appropriate light source or light emitting device. After coating on the part, it must be further dried and fired, which takes time and effort in the process. Fluorescent lamps are the mainstream light sources for backlights for liquid crystals, etc., which have been growing in demand in recent years, and thin plate-shaped lighting fixtures and display lamps. There is a problem because it is difficult to ensure uniformity of the light emission distribution due to the deviation, or there is a large restriction on the enlargement of the light source (that is, enlargement of the light emission area) in securing the mechanical strength of the structure. For this reason, the light emitting area of the flat light source is several cm.
Relatively small ones of about four sides or so-called edge light type in which a thin tube fluorescent lamp is arranged on an end face of a light guide plate which does not emit light by itself. However,
In the case of the edge light type, since the light guide plate itself does not emit light, there is a problem that a loss of visible light supplied from the fluorescent lamp to the light guide plate occurs in the light guide plate.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a highly efficient lighting apparatus which is easy to manufacture and is used for various uses, and a display device using the same. Is to do.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a fluorescent glass in which ions serving as luminescent centers are added to a base made of an amorphous inorganic compound;
An excitation light source that generates radiation light capable of exciting the fluorescent glass to emit light, and the fluorescent glass is excited and emitted by the radiation light of the excitation light source, so that the shape of the fluorescent glass is flat. Even in the case of a fluorescent lamp, there is less restriction on the increase in size as compared with conventional fluorescent lamps, and the fluorescent glass itself emits light compared to a light guide plate that guides the light of the light source, so that the loss can be reduced. , It is possible to obtain light that is optically more transparent than a conventional light source. Further, since the fluorescent glass is formed by adding ions to a base made of an amorphous inorganic compound, the production is easier than that of a conventional powdery phosphor. In addition, since the excitation light source and the fluorescent glass serving as the light emitting unit can be separated, heat generation of the light emitting unit can be reduced.

According to a second aspect of the present invention, in the first aspect of the present invention, the fluorescent glass is disposed in front of the excitation light source in the emission direction of the emitted light. An excitation light source is disposed on the light-emitting surface side. In the invention of claim 4, the excitation light source is disposed behind the irradiation target including the fluorescent glass, which is a preferred embodiment of the present invention.

According to a fifth aspect of the present invention, in the first aspect of the present invention, a visible light source is provided, and a fluorescent glass is disposed in front of the excitation light source and the visible light source in a radiation direction of the emitted light. At least one can be dimmed, and as a whole lighting fixture, it is possible to obtain light emission in which the emission of the visible light source is superimposed on the emission of the fluorescent glass, and by dimming the excitation light source or the visible light source, The color temperature of light emission can be changed.

According to a sixth aspect of the present invention, in the first aspect of the present invention, the fluorescent glass is formed so as to reduce the intensity of ultraviolet light contained in the light emitted from the excitation light source. An adverse effect such as fading of clothing can be prevented. According to the invention of claim 7, in the invention of claim 1, the fluorescent glass is formed so as to improve the color rendering index as compared with the case of using only the excitation light source. It is possible to realize a highly reliable lighting device.

According to an eighth aspect of the present invention, in the first aspect of the present invention, the reflecting plate including the fluorescent glass is provided on the side opposite to the radiation direction of the radiated light with respect to the excitation light source. It is. According to a ninth aspect of the present invention, in any one of the first to fifth aspects of the present invention, at least a part of the fluorescent glass is provided with a display unit for performing luminescent display, and the lighting fixture of the present invention is applied to a display device. can do.

[0011]

Embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) FIG. 1 is a side sectional view of a lighting fixture of the present embodiment.
Shown in The lighting apparatus A includes an apparatus main body 1 including a reflective shade 3 having an open lower surface, and a fluorescent lamp (excitation light source) disposed in the apparatus main body 1 and serving as an excitation light source that emits near-ultraviolet light having a peak wavelength of emitted light of about 350 to 360 nm. A lighting circuit 4 mounted on the upper surface of the appliance body 1 for lighting the black light 2; and a front cover 5 covering the opening of the appliance body 1. The front cover 5 is a black light. It is arranged ahead of the light 2 in the emission direction of the emitted light.

[0012] The front cover 5, the glass is amorphous inorganic compounds as a host consists of so-called fluorescent glass doped with ions to be a luminescent center to the mother, for example, P ₂ O ₅ ·
It has a composition of SrF ₂ .BaF ₂ : Eu ^3+, and is excited by near ultraviolet rays emitted from the black light 2 and emits red light having a peak wavelength of about 610 nm.
As the fluorescent glass, there are, for example, a glass in which a large amount of ZnO is added to silicate glass to activate Mn in 2ZnO.SiO ₂ to obtain fluorescence, and a glass in which uranium is added to borate glass. As these fluorescent glasses,
Similar to ordinary fluorescent lamp phosphors, it excites UV light into long-wavelength light, such as visible light, when excited by UV light, and emits visible light when excited by infrared light. A device that converts light into light having a shorter wavelength such as light and emits light has also been developed.

As described above, in the present embodiment, instead of the conventional powdery phosphor, a fluorescent glass formed by adding ions to a base made of an amorphous inorganic compound is used for the front cover 5. As a result, optical transparency is high, light emission with a sense of transparency can be obtained as compared with conventional lighting equipment, and workability is good. Further, in the present embodiment, the front cover 5 is disposed in front of the emission direction of the black light 2, but as shown in FIG.
A plurality of fluorescent glasses 7 processed into a shape (for example, a prism-like shape) that can provide an optical glittering feeling may be provided, and a highly decorative chandelier-like lighting device can be realized.

Here, the fluorescent glass 7 may have the same composition as that of the front cover 5 and emit red monochromatic light. For example, P ₂ O ₅ .SrF ₂ .Ba
A green light emitting material having a composition of F ₂ : Tb ³⁺ , for example, P ₂ O ₅ .AlF ₃ .MgF ₂ .CaF ₂ .SrF _2.
It is desirable to use the light emitting device in combination with a blue light emitting device having a composition of BaCl ₂ : Eu ²⁺ , so that a more luxurious and highly decorative lighting device can be realized.

(Embodiment 2) FIG. 3 is a side sectional view of a lighting fixture of this embodiment. In the lighting fixture A of the present embodiment, the lighting fixture A of the first embodiment is provided with an incandescent lamp 6 as a visible light source in the fixture main body 1, and the front cover 5 radiates the black light 2 and the incandescent lamp 6. It is arranged in front of the direction of light emission. Since the configuration other than the incandescent lamp 6 is the same as that of the first embodiment, the same components are denoted by the same reference numerals and description thereof will be omitted.

Here, the two types of black lights 2 and incandescent lamps 6 arranged side by side in the apparatus main body 1 are individually turned on / off by switch means (not shown). Can be turned on, or both the black light 2 and the incandescent bulb 6 can be turned on, and a lighting fixture that can produce three types of lighting scenes can be realized.

As in the first embodiment, the front cover 5 is formed by using an amorphous glass as a base and adding ions serving as emission centers to the base, for example, P ₂ O ₅ .SrF ₂ .B
Since it has a composition of aF ₂ : Eu ^3+, it has a high transmittance to visible light, and when only the incandescent lamp 6 is turned on, a yellowish emission specific to the incandescent lamp 6 is emitted. The light is emitted through the front cover 5. On the other hand, when the incandescent lamp 6 is turned off and only the black light 2 is turned on, the front cover 5 is excited by near-ultraviolet rays emitted from the black light 2 and emits red light having a peak wavelength of about 610 nm.

As described above, in the present embodiment, two types of light sources (black light 2 and incandescent light bulb 6) arranged in the apparatus main body 1 are switched, so that one lighting apparatus has different light colors and light qualities. Two types of illumination light can be obtained.
In the present embodiment, the black light 2 and the incandescent light bulb 6 are used.
4, the front cover 5 is disposed in front of the radiation direction. However, as shown in FIG. 4, instead of the front cover 5, the front cover 5 is formed into a shape (for example, a prism-like shape) that gives an optical glittering feeling. A plurality of processed fluorescent glasses 7 may be provided, and a lighting device with high decorativeness in a chandelier style can be realized.

Here, the fluorescent glass 7 may have the same composition as that of the above-described front cover 5 and emit red monochromatic light. For example, P ₂ O ₅ .SrF ₂ .Ba
A green light emitting material having a composition of F ₂ : Tb ³⁺ , for example, P ₂ O ₅ .AlF ₃ .MgF ₂ .CaF ₂ .SrF _2.
It is desirable to use the light emitting device in combination with a blue light emitting device having a composition of BaCl ₂ : Eu ²⁺ , so that a more luxurious and highly decorative lighting device can be realized. In the present embodiment, the incandescent lamp 6 is used as the visible light source. However, the present invention is not intended to limit the visible light source to the incandescent lamp 6, and a fluorescent lamp that emits visible light other than the incandescent lamp 6 may be used. Needless to say, it's good.

(Embodiment 3) In Embodiment 2, a black light 2 and an incandescent light bulb 6 are operated by switch means (not shown).
Are turned on / off individually, but in this embodiment, the black light 2 and the incandescent bulb 6 can be turned on / off individually.
In addition, the lighting circuit 4 allows the dimming of the black light 2 and the incandescent lamp 6 individually. Since the lighting fixture A has the same configuration as that of FIG. 3, illustration and description of common components are omitted.

The front cover 5 is made of, for example, P ₂ O ₅ .AlF
_{3 · MgF 2 · CaF 2 ·} SrF 2 · BaCl 2: Eu
It is composed of fluorescent glass having a composition of ²⁺ and emitting blue light when excited by near-ultraviolet light incident from the black light 2. First, when only the incandescent lamp 6 is turned on, the light emitted from the incandescent lamp 6 passes through the front cover 5 and is radiated to the outside as it is.
It will be around 800-3000K. When the lighting circuit 4 turns on the black light 2 in a state where the incandescent lamp 6 is turned on, the near-ultraviolet rays incident from the black light 2 excite the front cover 5 to emit blue light, and the blue light emitted from the front cover 5 becomes incandescent. The light is superimposed on the light emitted from the light bulb 6. At this time, if the output of the black light 2 is gradually increased, the incandescent lamp 6
The blue light emission of the front cover 5 superimposed on the light emission color of the lighting device A increases, and the light emission color of the entire lighting fixture A changes to white having a higher color temperature, and the color temperature can be continuously changed.

Incidentally, the color temperature can be changed by arranging two types of light sources having different color temperatures in the apparatus in parallel. However, when viewed from the front cover 5 side, the arrangement positions of the two types of light sources are provided. The difference in light color causes a difference in light color. However, in the present embodiment, the light emitted from the incandescent lamp 6 passes through the front cover 5, which is the other light source, and
Since the light is emitted to the outside, the light color can be made uniform over the entire surface of the front cover 5.

In this embodiment, the incandescent lamp 6 is used as a visible light source. However, the present invention is not intended to limit the visible light source to the incandescent lamp 6, but a fluorescent lamp that emits visible light other than the incandescent lamp 6 is used. It goes without saying that it may be used. Further, the front cover 5 is made of a fluorescent glass whose emission color is blue, but is not intended to limit the emission color to blue.
Using a fluorescent lamp with a relatively high color temperature of about 000K,
When used in combination with the front cover 5 made of fluorescent glass that emits yellow light by near-ultraviolet light, the fluorescent lamp and the black light 2 are individually adjusted to provide white light of about 5000K from a bulb color having a color temperature of about 3000K. Can be varied up to

(Embodiment 4) FIG. 5 shows a side sectional view of a lighting fixture of this embodiment. Since the basic configuration of the lighting fixture A is the same as that of the first embodiment, the same components are denoted by the same reference numerals and description thereof will be omitted. In the lighting fixture A of the present embodiment, a general fluorescent lamp 8 that can obtain visible light is used instead of the black light 2 as the excitation light source.
The front cover 5 is made of a fluorescent glass capable of obtaining an emission spectrum similar to that of the fluorescent lamp 8.

For example, when the fluorescent lamp 8 is used as a fluorescent material, Y ₂
A red light-emitting phosphor composed of O ₃ : Eu ³⁺ and LaPO ₄ :
The color temperature of about 3000 is obtained if a phosphor obtained by appropriately mixing a green light-emitting phosphor made of Ce ³⁺ and Tb ³⁺ is used.
K light bulb color can be obtained. In this case, the front cover 5
For example, P ₂ O ₅ .SrF ₂ .BaF ₂ : E
A fluorescent glass made of u ³⁺ and Tb ³⁺ is used.

Meanwhile, in a general fluorescent lamp 8, the wavelength is about 25 due to the discharge of mercury vapor sealed in a glass tube.
Ultraviolet light of 4 nm is generated, and the phosphor applied to the inner surface of the glass tube is excited and emitted by the ultraviolet light to emit visible light. However, the fluorescent lamp 8 has a wavelength of about 2
In addition to the 54 nm ultraviolet ray, a plurality of linear spectra are also emitted in the near ultraviolet region to the visible light region,
Of these linear spectra, near-ultraviolet radiation having a wavelength of about 365 nm is relatively strong. Here, the glass tube of the fluorescent lamp 8 is generally made of soda-lime glass, and due to its spectral transmittance characteristics, almost no radiated light having a wavelength of about 254 nm is transmitted, and is not emitted to the outside of the glass tube. Most of the emitted light of about 365 nm is transmitted and emitted to the outside of the glass tube. It is said that this light having a wavelength of about 365 nm has little harm to human bodies, but may have a bad effect such as fading on paintings and clothing.

The front glass 5 is made of, for example, P ₂ O ₅
SrF ₂ BaF ₂ : It is composed of a fluorescent glass made of Eu ³⁺ , Tb ³⁺ , which has a wavelength of about 3
Since the transmittance for 65 nm near-ultraviolet light is much lower than that of soda-lime glass, and absorbs most of near-ultraviolet light, the use of such a fluorescent glass makes it possible to reduce the radiation emitted from the fluorescent lamp 8. The intensity of the included ultraviolet rays can be greatly reduced, and the adverse effects of near ultraviolet rays on paintings and clothing can be reduced. In addition, the front glass 5 absorbs near-ultraviolet light having a wavelength of about 365 nm and emits light in a visible light spectrum similar to that of the fluorescent lamp 8, so that the emission spectrum of the front glass 5 is superimposed on the emission spectrum of the fluorescent lamp 8. Thus, the luminous efficiency of the entire lighting fixture A can be improved.

In the present embodiment, a general fluorescent lamp 8 is used, and the front cover 5 is made of a fluorescent glass capable of obtaining an emission spectrum similar to that of the fluorescent lamp 8. A fluorescent glass that can obtain an emission spectrum in a wavelength range that is insufficient for the spectrum may be used. For example, when the fluorescent lamp 8 is used as a phosphor, a red light-emitting phosphor composed of Y ₂ O ₃ : Eu ³⁺
If a phosphor using a green light-emitting phosphor composed of LaPO ₄ : Ce ³⁺ , Tb ³⁺ and a blue light-emitting phosphor composed of BaMg ₂ Al ₁₆ O ₂₇ : Eu ²⁺ appropriately is used,
White light having a color temperature of about 5000 K can be obtained. In this case, for example, a fluorescent glass made of phosphate doped with Mn ²⁺ is used as the front cover 5.

The above-described fluorescent lamp 8 is a so-called rare-earth three-wavelength narrow-band light-emitting fluorescent lamp, and has a higher average color rendering index and a superior color rendering property as compared with a conventional fluorescent lamp using a calcium halophosphate phosphor. I have. However, the fluorescent lamp 8 lacks a light emission spectrum in the deep red near the wavelength of about 650 nm, and it is said that if the light emission spectrum in the deep red is enhanced, the color rendering properties are further improved.

Therefore, in this embodiment, the front cover 5
A fluorescent glass made of phosphate doped with n ²⁺ is used, and red light having a peak wavelength of about 600 nm can be obtained from the front cover 5 by excitation with near ultraviolet rays having a wavelength of about 365 nm. This emission spectrum is a broad spectrum having a large half-value width and has a wavelength of about 650.
Since there is considerable intensity also in the vicinity of the deep red near nm, in addition to the emission of the fluorescent lamp 8, the emission of the front cover 5 is superimposed so that the insufficient deep red light of the fluorescent lamp 8 is emitted. Emission spectra can be superimposed.

The visible light emitted from the fluorescent lamp 8 passes through the front cover 5 and is emitted as it is. Similarly, near ultraviolet light having a wavelength of about 365 nm emitted from the fluorescent lamp 8 is absorbed by the front cover 5. The front cover 5 emits light with an emission spectrum containing deep red light by the near ultraviolet light, and can superimpose an emission spectrum containing deep red light which is insufficient for the fluorescent lamp 8. As a result, illumination light having higher color rendering properties can be obtained, and the color rendering index of the lighting fixture A can be improved. In order to increase the emission spectrum including the deep red light emitted from the front cover 5 by the excitation with the near ultraviolet light, as shown in FIG. About 350-360nm
The near-ultraviolet light emitted from the black light 2 may enhance the light emission of the front cover 5 and further improve the color rendering of the fluorescent lamp 8. Can be.

(Embodiment 5) The lighting fixture of this embodiment is
As shown in FIG. 7, the fluorescent glass 9 formed in a substantially tubular shape is used.
And a light source 10 made of, for example, a black light, which is arranged on one end side of the fluorescent glass 9 and can emit at least ultraviolet rays. In FIG. 7, the lighting circuit of the light source 10 is not shown. The fluorescent glass has the same composition as the fluorescent glass described in each of the above embodiments.

The ultraviolet light emitted from the light source 10 enters the fluorescent glass 9 from one end of the fluorescent glass 9. The fluorescent glass 9 is excited by this ultraviolet light to emit light, and visible light is radiated from the entire peripheral side surface of the fluorescent glass 9 to the outside. This radiated light can be used as illumination light. As described above, since the light source 10 as the heat source and the fluorescent glass 9 as the light emitting portion are separated from each other, the fluorescent glass 9 itself hardly generates heat and is used for irradiating light to a product that dislikes heat. A suitable lighting fixture A can be realized.

The light emitted from the other end of the fluorescent glass 9, that is, the end of the fluorescent glass 9 opposite to the light source 10 can be used like an optical fiber. If light emission from the end side is not required,
It is desirable to provide a reflecting film or a reflecting member 11 made of a reflecting film for reflecting ultraviolet light and visible light on the other end surface of the fluorescent glass 9. Note that, for example, aluminum is desirable as the reflective film.

Here, when the fluorescent glass 9 is in the shape of a solid bar,
Ultraviolet light incident from the light source 10 is almost absorbed in the vicinity of the incident portion of the fluorescent glass 9, and there is a possibility that uniform light emission cannot be obtained from the entire fluorescent glass 9. Therefore, as shown in FIG. 8, the fluorescent glass 9 is formed in a hollow cylindrical shape, and the fluorescent glass 9 is filled with an ultraviolet light guide 12 made of a material that easily transmits ultraviolet light, such as quartz, for example.
Sufficient light emission can be obtained up to the tip of the fluorescent glass 9. Further, as shown in FIG. 9, on the outer peripheral surface of the ultraviolet light guide 12, a dot-like film 12 made of a material (for example, aluminum or the like) having a high reflectance to ultraviolet light and visible light is provided.
is formed, the distribution of the dot-like film 12a is made dense at the end of the ultraviolet light guide 12 on the light source 10 side, and gradation is applied so that the distribution of the dot-like film 12a becomes narrower toward the other end. Thus, uniform illumination light can be obtained over the entire length of the fluorescent glass 9. Note that the dot-shaped film 12a may be formed on the inner surface of the fluorescent glass 9 formed in a cylindrical shape.
Similar effects can be obtained.

(Embodiment 6) The lighting fixture of this embodiment is
As shown in FIG. 10, a fluorescent glass 13 formed in a substantially flat plate shape and a light source made of, for example, a black light, which is disposed to face at least one of the outer peripheral end surfaces (edges) of the fluorescent glass 13 and can emit at least ultraviolet rays 14 is provided. In FIG. 10, the lighting circuit of the light source 14 is not shown. The fluorescent glass 13 has the same composition as the fluorescent glass 13 of each of the above-described embodiments.

The ultraviolet light emitted from the light source 14 enters the fluorescent glass 13 from the end face of the fluorescent glass 13, and the fluorescent light is excited by the incident light to emit light, and the surface (light emitting surface) 13 b of the fluorescent glass 13 is emitted. Visible light is emitted from the outside. Here, the ultraviolet light that has entered the fluorescent glass 13 from the end face 13a is almost absorbed in the vicinity of the incident portion and hardly reaches the entire surface of the fluorescent glass 13, so that FIG.
As shown in the figure, the back surface of the fluorescent glass 13 (non-light-emitting surface side)
Then, an ultraviolet light guide 15 formed in a substantially flat shape from a material that easily transmits ultraviolet light, such as quartz, is adhered to the surface, and the surface of the ultraviolet light guide 15 opposite to the fluorescent glass 13 is exposed to ultraviolet light and visible light. It is desirable to provide a reflection plate 16 made of a substance having a high reflectance (for example, aluminum or the like), and sufficient light emission can be obtained from the entire surface of the fluorescent glass 13. As shown in FIG. 12, on the surface of the ultraviolet light guide 15 on the side of the fluorescent glass 13, a dot-like film 15 a made of a material (for example, aluminum) having a high reflectance to ultraviolet light and visible light is formed. The end of the UV light guide 15 on the side
5a is made denser, and the dot-shaped film 1
If gradation is applied so that the distribution of 5a becomes sparse, uniform illumination light can be obtained over the entire surface of the fluorescent glass 13. Also, since the fluorescent glass 13 itself does not emit light,
Unlike a conventional fluorescent lamp formed in a flat plate shape, there is no limitation on the size, and the light emitting area can be increased.

It is to be noted that the lighting apparatus of the present embodiment can be used not only for lighting purposes but also as a liquid crystal display in combination with a liquid crystal. In addition, by combining with an acrylic plate or the like on which characters or pictorial figures are formed on the surface, thin indicator lights, guide lights, luminescent nameplates,
It can also be used as a display device such as a license plate for a vehicle.

(Embodiment 7) The lighting fixture of this embodiment is
As shown in FIG. 13, an appliance body 1 having a reflective shade 3 with an open lower surface, a fluorescent lamp 8 that emits visible light, and a lighting circuit 4 that lights the fluorescent lamp 8 are arranged in the appliance body 1. A front cover 5 that covers the opening of the instrument body 1 and a fluorescent glass layer 21 made of fluorescent glass formed on the inner surface of the reflective shade 3, and a reflector made of the reflective shade 3 including the fluorescent glass layer 21. Is provided on the opposite side to the emission direction of the emitted light with respect to the fluorescent lamp 8.

The visible light emitted from the fluorescent lamp 8 is emitted to the outside through the front cover 5, and a part of the visible light emitted from the fluorescent lamp 8 is also emitted to the reflection shade 3 side. Here, since the fluorescent glass layer 21 is transparent, the visible light transmitted through the fluorescent glass layer 21 is reflected by the reflector 3, transmitted again through the fluorescent glass layer 21, and emitted from the front cover 5 to the outside. Here, near ultraviolet rays having a wavelength of about 365 nm are also radiated from the fluorescent lamp 8, and the reflection shade 3
Near ultraviolet rays emitted to the side enter the fluorescent glass layer 21,
The fluorescent glass layer 21 is excited by the near ultraviolet light to emit light. The light emitted by the fluorescent glass layer 21 is reflected by the reflection shade 3 formed on the rear surface of the fluorescent glass layer 21, passes through the fluorescent glass layer 21, and is emitted from the front cover 5 to the outside. Since the emission of the fluorescent glass layer 21 is superimposed on the visible light emitted from the fluorescent lamp 8, the color rendering properties of the lighting fixture can be appropriately selected by appropriately selecting the emission colors of the fluorescent lamp 8 and the fluorescent glass layer 21. And the luminous efficiency can be improved.

(Embodiment 8) FIG. 1 is a schematic configuration diagram of an example of a display device using the lighting fixture of each embodiment described above for display.
It is shown in FIG. In FIG. 14, the lighting device of the light source 18 is not shown. This display device is disposed opposite to at least one surface of a display plate 17 which is a plate-shaped display portion and an outer peripheral end surface (edge) of the display plate 17, and is capable of radiating ultraviolet rays to at least the display plate 17, for example, black. A light source 18 composed of a light.

The display plate 17 is made of a colorless and transparent material (for example, acrylic resin or glass).
On the surface of the display plate 17, a character 17a indicating that the fluorescent glass is in use is formed. Since both the display plate 17 and the characters 17a are transparent to visible light, the characters 17a are not conspicuous when the light source 18 is turned off, and when the light source 18 is turned on, the characters 17a made of fluorescent glass are excited by the ultraviolet rays emitted from the light source 18. And the letters 17a emerge, so that a display device with good visibility can be realized. It should be noted that the fluorescent glass 13 may be formed in the same configuration as the fluorescent glass 13 shown in FIG. 11 so that the ultraviolet light incident from the light source 18 reaches the entire surface of the display plate 17.

(Embodiment 9) FIG. 15 shows a schematic configuration diagram of an example in which the lighting fixture of each of the above-described embodiments is used for a window glass as a display device for displaying a picture or a pattern. In FIG. 15, the lighting device of the light source 20 is not shown.
The display device includes a window glass 19 serving as a plate-shaped display unit, and a light source 20 that is arranged on each side of the window glass 19 and that can emit at least ultraviolet rays to the window glass 19. The window glass 19 is formed like a stained glass by combining a plurality of types of fluorescent glasses that emit light of various light colors.

Although the plurality of types of fluorescent glasses constituting the window glass 19 each have a slight body color, they are formed almost colorless and transparent.
When 0 is turned off, external light passes through the window glass 19 and enters the room, and the pattern of the stained glass formed on the window glass 19 is almost invisible. Meanwhile, the light source 2 at night
When 0 is turned on, the fluorescent glass formed on the window glass 19 is excited by the ultraviolet light incident from the light source 20 to emit light, and a bright stained glass pattern or pattern can be displayed. A window glass 19 having two functions of a window glass and a stained glass at night can be realized.

(Embodiment 10) FIGS. 16 (a) to 16 (c) show examples of display devices in which the lighting fixture of each of the above embodiments is used for a nameplate for displaying names. In FIG. 16, a lighting device for lighting the black light 2 is not shown. As shown in FIG. 16 (b), on the surface of the nameplate 22 as a display portion, a portion of a character 23 indicating a name is carved so as to be concave, and a colored (for example, black) is formed at the bottom of the concave portion. A paint 25 is applied, and a fluorescent glass layer 26 made of fluorescent glass is provided on the front surface of the paint 25. The black light 2 is arranged in front of the surface (light emitting surface) of the nameplate 22 so that the entire surface of the nameplate 22 can be irradiated. The black light 2 is stored in a storage case 24, and although not shown, the storage case 24
Inside, a reflector and a lighting circuit, etc., which are optically designed so as to efficiently irradiate the surface of the nameplate 22 are accommodated.

Here, during the daytime, the characters 23 made of the paint 25 can be seen through the transparent fluorescent glass layer 26 as it is. On the other hand, when the black light 2 is turned on at night, the entire surface of the nameplate 22 is illuminated by the black light 2, and ultraviolet rays enter the fluorescent glass layer 26. Since the fluorescent glass layer 26 is excited by this ultraviolet light to emit light,
By the light emission of the fluorescent glass layer 26, the characters 23 are displayed in a prominent manner, and the nameplate 22 with good visibility can be realized at any time of the day regardless of daytime or nighttime.

The character 23 does not need to be formed in a concave shape by engraving the surface of the nameplate 22, and a layer of paint 25 and a fluorescent glass layer 26 may be sequentially formed on the surface of the nameplate 22. The display device is not limited to the nameplate 22, but may be applied to other display devices such as guide boards, advertisement / signboard lights, license plates for vehicles, and the like. In addition, the stars and constellations are drawn with the fluorescent glass layer on the sky part of the landscape painting drawn with general paint, and these stars and constellations emerge when the black light is turned on at night It can also be applied to unusual wall-mounted paintings, and achieves a highly decorative, eye-catching and novel display.

(Embodiment 11) FIG. 17 shows an external view of a lighting fixture of this embodiment. This lighting fixture is composed of a case 27 in which a black light and its lighting circuit are housed, and a molded article 28 placed on the case 27 and formed entirely or at least partially of fluorescent glass. The light is arranged behind a model 28 as an object to be irradiated including fluorescent glass. Note that the basic configuration of the black light and the lighting circuit is the same as that of the first embodiment, so that illustration and description are omitted.

At least a part of the upper surface of the case 27
An aperture or a light-transmitting portion (not shown) made of a member that transmits ultraviolet light is provided. Near-ultraviolet rays emitted from the black light are irradiated on the object 28 through this transmitting portion, and the object 28 is unique to fluorescent glass. The present invention can provide a decorative stand that exhibits a transparent light emission, has high decorativeness, and can obtain faint light.

Embodiment 12 FIG. 18 shows an example in which the lighting fixture of this embodiment is applied to a table. The lighting apparatus includes a table 32 on which a near-ultraviolet irradiation device 30 including a black light and a lighting circuit thereof is disposed on a back surface of a top plate 31.
At least a part of the top plate 31 is provided with an opening or a light-transmitting portion (not shown) made of a member that transmits ultraviolet light. A plate-shaped fluorescent glass 33 to which near-ultraviolet rays from a black light are irradiated through a portion is provided.

When the black light is turned on, the fluorescent glass 33 disposed on the top plate 31 is irradiated with near ultraviolet light of the black light, and the fluorescent glass 33 is excited by the near ultraviolet light to emit light. A high table can be realized. In addition, if tableware 34 such as glass formed of fluorescent glass is used, tableware 34 emits light by near-ultraviolet rays emitted from black light,
The table 32 that can further enhance the decorativeness and create a fun atmosphere can be realized.

In the present embodiment, an example is described in which the above-described lighting fixture is applied to the table 32. However, it goes without saying that the lighting fixture may be applied to furniture other than the table 32, furniture such as chairs and interiors.

[0053]

As described above, according to the first aspect of the present invention, there is provided a fluorescent glass in which an ion serving as a luminescent center is added to a base made of an amorphous inorganic compound, and the fluorescent glass is excited to emit light. An excitation light source that generates the emitted light that can be generated is provided.The fluorescent glass is excited and emitted by the emitted light of the excitation light source, so even if the shape of the fluorescent glass is flat, it can be used as a conventional fluorescent lamp. Compared to the light guide plate that guides the light of the light source, the fluorescent glass itself emits light and the loss can be reduced, and the fluorescent glass is transparent to visible light. There is an effect that light with high optical transparency can be obtained as compared to Further, since the fluorescent glass is formed by adding ions to the base made of an amorphous inorganic compound, there is also an effect that the manufacture is easier than that of a conventional powdery phosphor. In addition, since the excitation light source and the fluorescent glass serving as the light emitting unit can be separated from each other, there is an effect that heat generation of the fluorescent glass can be reduced.

According to a second aspect of the present invention, the fluorescent glass is disposed in front of the light source for excitation in the emission direction of the emitted light. The invention of claim 4 is a preferred embodiment of the present invention in which an excitation light source is arranged behind an object to be irradiated including fluorescent glass. According to a fifth aspect of the present invention, a visible light source is provided, a fluorescent glass is disposed in front of the excitation light source and the visible light source in the emission direction of emitted light, and at least one of the two light sources can be dimmed. As a whole fixture, it is possible to obtain light emission in which light emission of a visible light source is superimposed on light emission of a fluorescent glass, and by dimming a light source for excitation or a visible light source, it is possible to change a color temperature of light emission of the whole lighting fixture. Thus, there is an effect that a lighting device having higher color rendering properties can be realized.

According to a sixth aspect of the present invention, since the fluorescent glass is formed so as to reduce the intensity of the ultraviolet light contained in the radiation emitted from the excitation light source, the fluorescent glass has an adverse effect such as fading of paintings and clothing due to the ultraviolet light. There is an effect that it can be prevented. According to the seventh aspect of the present invention, since the fluorescent glass is formed so as to improve the color rendering index as compared with the case where the excitation light source is used alone, a lighting device having higher color rendering properties is realized by light emission from the fluorescent glass. There is an effect that can be.

The invention according to claim 8 is a preferred embodiment of the present invention in which the reflection plate containing the fluorescent glass is provided on the side opposite to the emission direction of the emitted light with respect to the excitation light source. According to the ninth aspect of the present invention, at least a part of the display is provided with a display unit for performing light emission display formed of the fluorescent glass.
There is an effect that the lighting fixture of the present invention can be applied to a display device.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a lighting fixture of a first embodiment.

FIG. 2 is a side sectional view showing another lighting apparatus of the above.

FIG. 3 is a side sectional view showing a lighting apparatus according to a second embodiment.

FIG. 4 is a side sectional view showing another lighting apparatus of the above.

FIG. 5 is a side sectional view showing a lighting device according to a fourth embodiment.

FIG. 6 is a side sectional view showing another lighting device of the above.

FIG. 7 is a side sectional view showing a lighting fixture of a fifth embodiment.

FIG. 8 is a cross-sectional view of the fluorescent glass used in Embodiment 1;

FIG. 9 is a perspective view of an ultraviolet light guide used in the above.

FIG. 10 is a side sectional view showing a lighting fixture of a sixth embodiment.

FIG. 11 is a cross-sectional view of the fluorescent glass used in Embodiment 1;

FIG. 12 is a top view of the ultraviolet light guide used in the first embodiment.

FIG. 13 is a side sectional view showing a lighting fixture of a seventh embodiment.

FIG. 14 is a perspective view illustrating a display device according to an eighth embodiment.

FIG. 15 is a schematic configuration diagram illustrating a display device according to a ninth embodiment.

16A and 16B show a display device according to a tenth embodiment, wherein FIG. 16A is a perspective view of a main part, FIG. 16B is a side sectional view, and FIG.

FIG. 17 is an external perspective view showing a lighting fixture of an eleventh embodiment.

FIG. 18 is an external perspective view showing a table using the lighting fixture of the twelfth embodiment.

[Explanation of symbols]

 2 Black light 5 Front cover

Continuation of front page (72) Inventor Kenji Kono 1048 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Works, Ltd.

Claims (9)

[Claims] 1. A fluorescent glass comprising a base made of an amorphous inorganic compound to which ions serving as emission centers are added, and an excitation light source for generating radiation light capable of exciting the fluorescent glass to emit light. A lighting device characterized by comprising: 2. The luminaire according to claim 1, wherein the fluorescent glass is disposed in front of the excitation light source in the emission direction of the emitted light. 3. The lighting apparatus according to claim 1, wherein an excitation light source is arranged on a light emitting surface side of the fluorescent glass. 4. The lighting apparatus according to claim 1, wherein an excitation light source is disposed behind an object to be irradiated including the fluorescent glass. 5. A light source comprising: a visible light source; a fluorescent glass disposed in front of the excitation light source and the visible light source in a radiation direction of the emitted light; and at least one of the two light sources can be dimmed. The lighting fixture according to claim 1. 6. The lighting apparatus according to claim 1, wherein the fluorescent glass is formed so as to reduce the intensity of ultraviolet light contained in radiation emitted from the excitation light source. 7. The lighting apparatus according to claim 1, wherein the fluorescent glass is formed so as to improve the color rendering index as compared with the case where the excitation light source is used alone. 8. The lighting apparatus according to claim 1, wherein the reflection plate including the fluorescent glass is provided on a side opposite to a radiation direction of the emitted light with respect to the excitation light source. 9. A display device using a lighting device according to claim 1, further comprising a display unit for displaying light emission, at least a part of which is formed from said fluorescent glass.