JP2007129035A - Ultraviolet phosphor cap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ultraviolet phosphor cap for enhancing advertisement effect or illumination effect. <P>SOLUTION: A UV cap 12 covers UVLED 10, where a phosphor material is dispersed as excited with the ultraviolet ray to emit the light. Lights different in colors in accordance with viewing directions are emitted by deviating allocation of the phosphor materials 100a to 100c in a plurality of kinds in the shape of laminated layers. That is, three colors C1 to C3 can be visualized when the phospohor materials are viewed from a side surface V1, and a mixed color C4 can also be visualized when the materials are viewed just from the above area V2. The color C4 may be varied to enhance the illumination effect by making it possible to change the lamination sequence of the phosphor materials 100a to 100c. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cap that covers a light source that emits ultraviolet light.

Conventionally, UVLED has been developed as a light source having an emission peak in the ultraviolet region. Since the ultraviolet light cannot be seen as it is, it is necessary to cover the UVLED with a resin coated with a phosphor and convert the ultraviolet light from the UVLED into visible light in order to use it for illumination or the like.
Patent Document 1 below discloses the use of a phosphor that is excited by ultraviolet light.

  In Patent Document 2 below, a wavelength conversion member having a phosphor is composed of a phosphor and a light projecting inorganic member, and the phosphor and the light projecting inorganic member are layered, striped, latticed, concentric. Disposing in a dot shape or the like is disclosed.

JP 2002-359404 A JP 2004-363343 A

  As described above, the technology for converting ultraviolet light into visible light is known, but it is basically intended to irradiate visible light with a specific directivity angle, and it can be used at a wide angle to enhance decoration and advertising effects. There is a problem that is not suitable for the purpose of increasing the advertising effect by emitting visible light. Furthermore, it is desirable that the emission color can be changed as appropriate in order to exert a high advertising effect, and it is possible to attract attention by making the emission color different depending on the viewing angle. Not considered.

  In view of the above problems, an object of the present invention is to provide an apparatus that can enhance the advertising effect or the illumination effect.

The ultraviolet light fluorescent cap of the present invention is characterized in that a light source having a light emission peak in the ultraviolet region is coated, and a phosphor excited by ultraviolet light from the light source is dispersed therein and is detachable.

  In one embodiment of the present invention, the phosphors are a plurality of types of phosphors having different emission wavelengths, and the plurality of types of phosphors are unevenly distributed in specific regions so that light having different wavelengths depending on the viewing direction can be obtained. It is preferable to emit light. Further, it is preferable that the plurality of types of phosphors are unevenly distributed so as to be stacked on each other.

  According to the present invention, the ultraviolet light emitted from the light source is repeatedly absorbed and scattered inside the cap, and the phosphor dispersed inside the cap is excited to emit light. This makes it possible to enhance the illumination effect or the decoration effect by emitting light not in a specific direction angle but in a wider angle, that is, in a whole area. The cap of the present invention is detachable, and the user can easily change the emission color simply by replacing the cap. Furthermore, by unevenly distributing a plurality of types of phosphors, an effect of changing the color depending on the viewing direction can be provided.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings, taking as an example a UVLED that emits ultraviolet light as a light source.

  1A and 1B show the configuration of the present embodiment. The UV cap 12 of this embodiment is configured by molding a resin such as epoxy into a bell shape or a bullet shape, and a space for accommodating the UVLED 10 is formed inside. The phosphor 100 excited by the ultraviolet light from the UVLED 10 is dispersed almost uniformly inside the UV cap. The UV cap 12 is coated on the UVLED 10 as shown in FIG. 1B, and a bias current is applied to the UVLED 10. When driven, it emits light when excited by ultraviolet light from the UVLED 10. Ultraviolet light from the UVLED 10 is scattered and diffused inside the UV cap 12, and the inside of the UV cap 12 is irradiated over almost the entire region to excite phosphors dispersed substantially uniformly inside. Therefore, in the present embodiment, visible light is emitted from almost the entire surface of the UV cap 12 as shown in FIG.

  The UVLED 10 can be a gallium nitride compound semiconductor, for example, GaN, InGaN, AlInGaN, or a quantum well structure LED formed by adding impurities such as Si and Zn to these compounds, and applies a DC bias voltage. Thus, ultraviolet light having an emission peak at 300 nm to 430 nm is emitted.

  The phosphor 100 is made of a material that emits fluorescence when excited by ultraviolet light. For example, the phosphor 100 is a phosphate or borate phosphor containing Mg, Ca, Sr, Zn, Eu, Mn, Sn, Fe, or Cr. is there. The phosphor includes a phosphorescent material.

  Since the UV cap 12 of the present embodiment is configured to be detachable with respect to the UVLED 10, a plurality of UV caps 12 in which different phosphors 100 are dispersed are prepared, and the same UVLED 10 can be replaced by appropriately replacing them. It is possible to emit different light while using. For example, instead of the UV cap 12 in which the phosphor 100 that emits green light when excited is dispersed, the UV cap 12 in which the phosphor 100 that emits red light is dispersed is coated on the UVLED 10 so that the emission color is increased. Can be easily changed from green to red, and the illumination effect can be enhanced.

  In FIG. 2, the top view (plan view of the state coat | covered with UVLED10) of UV cap 12 of other embodiment is shown. In the UV cap 12 shown in FIGS. 1A and 1B, the phosphor 100 that emits a specific color when excited by ultraviolet light is dispersed. In FIG. 2A, two types of phosphors are divided into a right half and a left half. An example in which light is emitted in two different colors C1 and C2 is shown. Similarly, FIG. 2B shows an example in which three types of phosphors are dispersed three times symmetrically to emit three types of colors C1, C2, and C3. In these examples, since the color looks different depending on the viewing direction, the illumination effect can be further enhanced.

  FIG. 3 shows still another UV cap 12 configuration. When the phosphor is dispersed in the UV cap 12, it is unevenly distributed so as to have a laminated structure. For example, three types of phosphors 100a, 100b, and 100c are sequentially stacked from the bottom of the UV cap 12. The region where the phosphor 100a is dispersed in the UV cap 12 is the region 12a, the region where the phosphor 100b is dispersed is 12b, and the region where the phosphor 100c is dispersed is the region 12c. When viewed from the direction V1), the emission color C1 of the region 12a, the emission color C2 of the region 12b, and the emission color C3 of the region 12c are visible, and when the UV cap 12 is viewed from directly above (direction V2 in the figure), , 12c can be visually recognized. That is, the color can be different depending on the viewing direction.

  In FIG. 3, when the phosphor 100a is a phosphor that emits red light by excitation, the phosphor 100b is a phosphor that emits green light by excitation, and the phosphor 100c is a phosphor that emits blue light by excitation, viewed from the direction V2. In some cases, the color is white, but various colors can be obtained by changing the stacking order of the phosphors 100a to 100c.

  FIG. 4 shows light emission colors when the stacking order of the phosphors 100a to 100c in the regions 12a to 12c in FIG. 3 is changed. In the figure, “12a”, “12b”, and “12c” indicate the emission colors of the phosphors in the regions 12a, 12b, and 12c, respectively, “C4” indicates the color when viewed from the V2 direction, and “C1”, “C2” and “C3” respectively indicate the colors of the lower, middle, and upper parts when viewed from the V1 direction.

  When the emission color of the phosphor in the region 12a is R (red), the emission color of the phosphor in the region 12b is G (green), and the emission color of the phosphor in the region 12c is B (blue), C1, C2, and C3 are Although they are R, G, and B, respectively, C4 is white as a mixed color thereof.

  On the other hand, when the emission color of the phosphor in the region 12a is B, the emission color of the phosphor in the region 12b is G, and the emission color of the phosphor in the region 12c is R, C1, C2, and C3 are B, G, and R, respectively. Although there is, C4 is yellow or orange.

  Further, if the emission color of the phosphor in the region 12a is B, the emission color of the phosphor in the region 12b is R, and the emission color of the phosphor in the region 12c is G, C1, C2, and C3 are B, R, and G, respectively. Although there is, C4 is yellow or orange.

  Further, if the emission color of the phosphor in the region 12a is R, the emission color of the phosphor in the region 12b is B, and the emission color of the phosphor in the region 12c is G, C1, C2, and C3 are R, B, and G, respectively. Although there is, C4 is yellow or orange.

  Further, when the emission color of the phosphor in the region 12a is G, the emission color of the phosphor in the region 12b is R, and the emission color of the phosphor in the region 12c is B, C1, C2, and C3 are G, R, and B, respectively. Although there is C4, it becomes magenta.

  Further, when the emission color of the phosphor in the region 12a is G, the emission color of the phosphor in the region 12b is B, and the emission color of the phosphor in the region 12c is R, C1, C2, and C3 are G, B, and R, respectively. Although there is C4, it becomes magenta.

  As described above, by changing the stacking order of the three types of phosphors 100a to 100c, various kinds of light can be emitted. Therefore, the illumination effect can be further enhanced by preparing a plurality of UV caps 12 in which the stacking order of the phosphors 100a to 100c is changed, and appropriately covering them to cover the UVLED 10.

In the present embodiment, the shape of the UV cap 12 is a bell shape, but may be an arbitrary shape. For example, the shape of the UV cap 12 may be a rectangular parallelepiped, and the shape of the regions 12a, 12b, and 12c in FIG. The user can emit various colors as shown in FIG. 4 while using the same UVLED 10 by setting the stacking order to a desired order. For example, the first layer: R from the order in which the stacking order in the default state is close to the UVLED
Second layer: G
3rd layer: B
And if the user wants to change it so that it looks magenta when viewed from the direction of V2, the user exchanges the first and second layers with each other,
First layer: G
Second layer: R
3rd layer: B
And it is sufficient.

It is a block diagram of UV cap of embodiment. It is a covering state explanatory view of the UV cap of the embodiment. It is a top view in the covering state of the UV cap of other embodiments. It is a block diagram of UV cap of other embodiment. It is explanatory drawing which shows the relationship between the lamination order in the UV cap of FIG. 3, and luminescent color.

Explanation of symbols

  10 UVLED, 12 UV cap (ultraviolet fluorescent cap), 100 phosphor.

Claims (4)

  A detachable ultraviolet light fluorescent cap in which a light source having an emission peak in the ultraviolet region is coated and a phosphor that is excited by ultraviolet light from the light source is dispersed therein. In the ultraviolet fluorescent cap according to claim 1,
The phosphor is a plurality of types of phosphors having different emission wavelengths.
The ultraviolet fluorescent cap, wherein the plurality of types of phosphors are unevenly distributed in specific regions, and emit light having different wavelengths depending on the viewing direction. The ultraviolet light fluorescent cap according to claim 2,
The ultraviolet fluorescent cap, wherein the plurality of types of phosphors are unevenly distributed so as to be stacked on each other. The ultraviolet light fluorescent cap according to claim 3,
The ultraviolet light fluorescent cap, wherein the order of the layers can be changed.

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