JP2008021812A - Light-emitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light-emitting device that dispenses with any special electronic circuits, high-pressure equipment, or the like, and can emit visible light having uniform brightness in a wide range efficiently. <P>SOLUTION: The light-emitting device has an ultraviolet ray generation means that has an ultraviolet ray emission source comprising an ultraviolet light-emitting diode, and generates ultraviolet rays; a phosphor that receives the ultraviolet rays from the ultraviolet ray generation means and generates visible light; and a visible light transmission member for throwing the visible light from the phosphor to the outside. With this configuration, ultraviolet rays are generated by the ultraviolet ray generation source of the ultraviolet ray generation means and are applied to the phosphor, thus emitting visible light with uniform brightness over a wide range efficiently without requiring any special electronic circuits and high-pressure equipment. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The invention of this application relates to a light emitting device that emits visible light using ultraviolet rays as a light source.

  In general, a light-emitting device such as a fluorescent lamp that is used as a lighting means emits thermoelectrons by heating current filaments (hot cathodes) in a fluorescent tube containing mercury vapor. Visible light is obtained by applying electrons to the phosphor to cause the phosphor to emit light.

  However, a fluorescent lamp can emit light only in a narrow cylindrical fluorescent tube, and it is necessary to keep the filament at a high voltage and accelerate the generation of thermoelectrons using a high frequency.

  Therefore, it is necessary to combine a transformer (ballast) and complicated electronic circuit, and the inside of the fluorescent tube must be kept in a vacuum state in order not to reduce the impact velocity of the thermal electrons and to protect the filament. . Therefore, it is not suitable for forming a planar light emitter.

  For this reason, conventionally, in order to form a planar light emitting device, it is generally configured by combining a number of light emitting diodes.

  In some electronic devices such as mobile phones, light emitting devices such as organic EL are also employed.

  However, the light-emitting diode itself is expensive, and if a large number of light-emitting diodes are required, the product price of the light-emitting device itself is considerably expensive. Further, in the case of a configuration in which the light emitting diodes are combined, there is only a combination of point light sources in the end, so there is a limit to realizing a light emitting device of a surface light source with uniform brightness over a wide range.

  On the other hand, in the case of organic EL, there is a problem in manufacturing technology and it is very expensive.

  The present invention has been made to solve such a problem. By emitting phosphors with ultraviolet rays and allowing visible light to be efficiently emitted in a wide range, a special electronic circuit or An object of the present invention is to provide a low-cost light-emitting device that does not require high-voltage equipment and is easy to manufacture.

  In order to achieve the same object, the present invention is configured with the following problem solving means.

(1) Invention of Claim 1 The light emitting device of the present invention has an ultraviolet light emitting source comprising an ultraviolet light emitting diode and generates ultraviolet light, and generates visible light upon receiving the ultraviolet light from the ultraviolet light generating means. And a visible light transmitting member that projects visible light from the phosphor to the outside.

  According to such a configuration, ultraviolet rays are generated by an ultraviolet light emitting source composed of an ultraviolet light emitting diode as an ultraviolet ray generating means, and the phosphor is irradiated with the ultraviolet rays. Visible light can be efficiently emitted.

  Moreover, the point light source by the combination of the conventional light emitting diode can be changed into a surface light source, and it can be set as a more natural uniform light source.

  Moreover, since the ultraviolet light emitting diode, which is a semiconductor, is used as the ultraviolet light emitting source of the ultraviolet light generating means, the life of the light source is extended, and a light emitting device that has a much longer life than conventional fluorescent lamps is realized. Is possible.

  Further, it is not necessary to make the inside of the light emitting device vacuum like a fluorescent lamp.

(2) Invention of Claim 2 The light-emitting device of this invention has the diffusion means which diffuses the ultraviolet-ray from the ultraviolet-light-emitting source of an ultraviolet-ray generation means toward a fluorescent substance in the structure of the invention of the said Claim 1. It is said.

  In this way, when the diffusion means for diffusing the ultraviolet light from the ultraviolet light source of the ultraviolet light generation means toward the phosphor, the ultraviolet light irradiated from the ultraviolet light source of the ultraviolet light generation means is uniformly high-density toward the phosphor. The visible light from the phosphor is also emitted outward from the entire surface of the phosphor uniformly.

  As a result, the luminous efficiency of visible light is improved and a more natural surface light source can be realized.

(3) Invention of Claim 3 The light-emitting device of this invention is the ultraviolet light reduction which interrupts | blocks or reduces the ultraviolet-ray in the light irradiated outside through the visible light transmissive member in the structure of the said invention of Claim 1 or 2. It has the means.

  As described above, when the ultraviolet ray reducing means for blocking or reducing the ultraviolet ray in the light beam projected to the outside through the visible light transmitting member is provided, the ultraviolet ray irradiated to the phosphor is irradiated to the outside as it is through the visible light transmitting member. Can be effectively prevented.

  As a result, according to the light-emitting device of the present invention, it is possible to provide a low-cost light-emitting device that solves the various problems of the conventional light-emitting devices described above.

  In particular, it is easier to manufacture than an organic EL or the like, and is suitable for realizing a flat light emitter having a low cost and a simple structure.

  Next, several best modes for carrying out the present invention will be described.

(Best Mode 1)
First, FIGS. 1 to 3 show a configuration of a light emitting device 1 according to the best mode 1 of the present invention.

  The light emitting device 1 includes an ultraviolet ray generation means 7 having an ultraviolet light emission source for generating ultraviolet rays, a diffusion means for diffusing ultraviolet rays from the ultraviolet light emission source of the ultraviolet ray generation means 7 toward the phosphor 4, and the ultraviolet rays. It is composed of a phosphor 4 that generates visible light in response to ultraviolet rays from the generating means 7 and a visible light transmitting member 3 that radiates visible light from the phosphor 4 to the outside.

  The ultraviolet light emitting part 7a of the ultraviolet light generating means 7 includes, for example, an ultraviolet light emitting diode 10 as an ultraviolet light emitting source, a pair of (+) and (−) bias electrodes 13 and 13, as shown in detail in FIG. A pair of electrode holding members 12 and 12 holding a pair of bias electrodes 13 and 13, an Epone diffusion lens 14 for diffusing ultraviolet light emitted from the ultraviolet light emitting diode 10 as shown in the figure, and the ultraviolet light emission. The reflecting surface portion 11 has a reflecting surface 11a that reflects ultraviolet rays in a direction opposite to the irradiation direction of the diode 10 in the irradiation direction. The ultraviolet light emitting diode 10 portion of the light emitting portion 7a has a pair of bias electrodes 13 and 13 and an electrode holder. A pair of (+) and (−) leads 7b, 7b are connected through the members 12, 12.

  Then, when a predetermined forward bias voltage is applied between the pair of bias electrodes 13 and 13 through the same pair of leads 7b and 7b, ultraviolet rays are radiated in a predetermined viewing angle direction (see arrows) according to the voltage value. ).

  On the other hand, the phosphor 4 is made of a desired type of fluorescent material that receives visible light from the ultraviolet light-emitting diode 10 and generates visible light. As an example, the phosphor 4 has a rectangular shape as shown in the figure and has a desired planar area. The visible light transmitting member 3 is provided on the entire inner surface of the visible light transmitting member 3 in a form having a desired thickness.

  For the visible light transmitting member 3, for example, a transparent ultraviolet cut glass (UV cut glass) capable of blocking or sufficiently reducing the ultraviolet light transmitted through the phosphor 4 portion is employed, and only visible light is exposed to the outside. It comes to shine.

  By the way, in the case of this form, the same shape and the same shape as the visible light transmitting member 3 are provided at positions facing the visible light transmitting member 3 coated with the phosphor 4 via the ultraviolet light path 6 having a predetermined width. A mounting plate 2 made of metal such as aluminum having a planar area is provided, and the inner surface of the mounting plate 2 is formed on an ultraviolet reflecting surface 2a that reflects the ultraviolet rays from the ultraviolet light emitting diode 10 to the phosphor 4 side. Has been.

  The ultraviolet light path 6 between the visible light transmitting member 3 and the mounting plate 2 is formed by shielding the outer periphery 4 in a frame shape with synthetic resin shield members 5a to 5d mixed with phosphors. Sealed to prevent leakage.

  The ultraviolet ray generation means 7 having the above-described configuration is provided at the central portion of the shield member (side wall portion) 5a in the longitudinal direction of the main casing of the flat light emitting device 1 formed as described above. The diffusing lens 14 is placed in a shielded state with the sealed ultraviolet light path 6 facing it.

  Accordingly, in the above configuration, the ultraviolet light emitted from the ultraviolet light emitting diode 10 of the ultraviolet light emitting portion 7a of the ultraviolet light generating means 7 is effectively diffused by the diffusing action (see FIG. 3) by the diffusing lens 12 while the phosphor. Through the ultraviolet light path 6 formed between the visible light transmitting member 3 surrounded by the shielding members 5a to 5d mixed with the phosphor 4 and the mounting plate 2 having the ultraviolet reflecting surface 2a. The phosphor 4 and the shield members 5a to 5d are irradiated. At this time, the ultraviolet rays from the ultraviolet light emitting portion 7a are also applied to the reflection surface 2a on the inner side of the mounting plate 2, but the ultraviolet rays are reflected by the reflection surface 2a and are also applied to the phosphor 4 and the like. Is done.

  And when the said ultraviolet-ray is irradiated, the fluorescent substance in the fluorescent substance 4 and shield member 5a-5d generate | occur | produces visible light by the fluorescence effect | action, and the visible light is made outside via the said visible light transmissive member 3. Emerge.

  The visible light is emitted to the outside uniformly over the entire wide light emitting surface of the visible light transmitting member 3 shown in the figure, and the entire flat portion efficiently emits light with uniform brightness.

  For this reason, the light-emitting device having the above configuration efficiently emits visible light in a wide plane range without requiring a special electronic circuit such as a conventional fluorescent lamp, a high-pressure device, a tube containing mercury vapor, or the like. be able to. Moreover, it is not necessary to make the inside of a light-emitting device into a vacuum state.

  In addition, unlike a point light source using a combination of conventional light emitting diodes, a surface light source with uniform brightness can be obtained over the entire surface, and a more natural planar light source can be obtained.

  In the above light emitting device, the diffusing lens 12 as a diffusing means for diffusing the ultraviolet light from the ultraviolet light emitting diode 10 toward the phosphor 4 is provided in the ultraviolet light emitting portion 7a of the ultraviolet light generating means 7.

  Thus, when the diffusion lens 12 that diffuses the ultraviolet rays from the ultraviolet light emitting diode 10 toward the phosphor 4 is provided in the ultraviolet light emitting portion 7a, the ultraviolet rays are uniformly directed toward the phosphor 4 and the shield members 5a to 5d. As a result, the visible light from the fluorescent substance 4 and the fluorescent substance in the shield members 5a to 5d is emitted uniformly from the entire surface of the visible light transmitting member 3 to the outside.

  As a result, the luminous efficiency of visible light can be improved, and a more natural light emitting surface light source can be realized.

  Further, in the above light emitting device, an ultraviolet ray cut function (UV cut function) as ultraviolet ray reducing means for blocking or reducing ultraviolet rays in the light beam projected to the outside through the visible light transmissive member 3 to the visible light transmissive member 3. Is provided.

  As described above, when the visible light transmitting member 3 is provided with the ultraviolet ray cutting function for blocking or reducing the ultraviolet rays in the light beam projected to the outside through the visible light transmitting member 3, the ultraviolet rays irradiated to the phosphor 4 are provided. Can be effectively prevented from being directly irradiated to the outside through the visible light transmitting member 3.

  Further, in the above light emitting device, the ultraviolet light emitting section 7a of the ultraviolet light generating means 7 is configured with the ultraviolet light emitting diode 10 as a light source.

  Thus, when the ultraviolet light emitting diode 10 which is a semiconductor is employed as the ultraviolet light emitting source of the above-described ultraviolet light generating means 7, the life of the light source is prolonged, and a light emitting device having a much longer life than a conventional fluorescent lamp or the like can be obtained. It can be realized.

  As a result, according to the above light-emitting device, it is possible to provide a light-emitting device having a low cost and a simple structure that solves the various problems of the conventional light-emitting device described above.

  In particular, in the case of this apparatus, it is suitable for realizing a flat light emitter having a simple structure and low cost that is easy to manufacture as compared with an organic EL or the like.

(Best Mode 2)
Next, FIG. 4 and FIG. 5 show the configuration of the light emitting device according to the best mode 2 of the present invention.

  In the configuration of the best mode 1, the visible light transmitting member 3 and the mounting plate 2 are both formed of a complete plate member, and are joined by shield members 5a to 5d having a spacer function for defining the optical path 6 interval. In the configuration of the best mode 2, the mounting plate 2 side is disposed on the side of the side wall portions 5a 'to 5d' corresponding to the shield members 5a to 5d as shown in FIGS. 4 and 5, for example. And a visible light transmitting member 3 similar to that of the configuration of the best mode 1 is fitted inside the opening, and the periphery is bonded and integrated. Is. If necessary, the inner surface of the side wall portions 5a 'to 5d' is also coated with the phosphor 4.

  The rest of the configuration including the ultraviolet ray generating means 7 is the same as that of the configuration of the best mode 1 described above.

  According to such a structure, compared with the case of the best form 1 in which the shield members 5a to 5d are separate members, the number of parts is reduced and assembly is facilitated.

(Other forms)
(1) Visible light transmitting member 3 1-1) In each of the above embodiments, a glass body having an ultraviolet cut function is employed. However, this employs a synthetic resin body such as acrylic having the same function. Also good.

  1-2) Further, it is not always necessary to provide the visible light transmitting member 3 with an ultraviolet cut function. For example, an ultraviolet cut member (a film body having a UV cut function, a glass body, a synthetic resin, etc.) is provided in parallel. You may make it do.

(2) About the phosphor 4 It is not always necessary to coat the inner surface of the visible light transmitting member 3, and for example, it may be affixed as a seal member, or may be arranged in parallel as a completely separate member.

(3) Mounting plate 2 This is not necessarily a metal plate, but may be a reflecting surface 2a by installing a mirror member on the inner surface of a synthetic resin molded one.

It is sectional drawing which shows the structure of the light-emitting device which concerns on the best form 1 for implementing this invention. It is a front view of the light-emitting device. It is sectional drawing which shows the structure of the ultraviolet-ray generation means in the light-emitting device. It is sectional drawing which shows the structure of the light-emitting device which concerns on the best form 2 for implementing this invention. It is a front view of the light-emitting device.

Explanation of symbols

  1 is a light emitting device, 2 is a mounting plate, 2a is a reflecting surface, 4 is a phosphor, 5a to 5d are shield members, 5a 'to 5d' are side walls, 6 is an ultraviolet light path, 7 is an ultraviolet light generating means, and 7a is An ultraviolet light emitting portion, 7b is a lead, 10 is an ultraviolet light emitting diode, 11 is a reflecting surface portion, 11a is a reflecting surface, and 14 is a diffusing lens.

Claims (3)

  An ultraviolet light generating means having an ultraviolet light source composed of an ultraviolet light emitting diode and generating ultraviolet light, a phosphor generating visible light upon receiving the ultraviolet light from the ultraviolet light generating means, and visible light from the phosphor to the outside A light emitting device comprising a visible light transmitting member that emits light.   2. The light emitting device according to claim 1, further comprising diffusion means for diffusing ultraviolet rays from an ultraviolet light source of the ultraviolet ray generation means toward the phosphor.   3. The light emitting device according to claim 1, further comprising ultraviolet reducing means for blocking or reducing ultraviolet rays in the light emitted to the outside through the visible light transmitting member.

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