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Light source device

A technology of light source device and light emitting tube, which is applied in the direction of light source, electric light source, point light source, etc., can solve the problems of unsightly appearance, easy temperature rise of LED chip, high power connection of UV-LED, etc.

Inactive Publication Date: 2013-03-06
TOSHIBA LIGHTING & TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, since the ultraviolet ray radiated from the UV-LED is irradiated only to the head of the glass tube, there are problems that not only the head of the glass tube is illuminated and is unsightly, but also because the LED chip is in a state of floating in the glass tube, the LED The temperature of the chip is easy to rise, it is difficult to connect high power to UV-LED, and it is impossible to obtain light with high luminous flux.

Method used

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Examples

Experimental program
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Embodiment approach 1

[0023] figure 1 and figure 2 Used to describe Embodiment 1 related to the light source device, figure 1 is the appearance diagram, figure 2 is used for figure 1 A cross-sectional view illustrating the internal surface structure of .

[0024] exist figure 1 and figure 2 Among them, 11 is a luminous tube made of, for example, quartz glass, borosilicate glass or transparent resin, in which one end of a straight tube 111 is spherically sealed 112 . A phosphor layer 12 coated with phosphor is formed on the inner surface of the light emitting region 11 a at the tip of the arc tube 11 . A reflective film 13 made of, for example, a barium sulfate layer is formed on the inner surface of the arc tube 11 from the light emitting area 11a to the other end side of the straight tube area 11b.

[0025] Reference numeral 14 is a support member made of, for example, synthetic resin, which has heat resistance and has an opening 141 formed in the center. The open end of the arc tube 11...

Embodiment approach 2

[0059] Figure 4 This is used to describe Embodiment 2 related to the light source device. This embodiment ensures safety when constituting a light source using LD. In addition, the same code|symbol is attached|subjected to the same component as the above-mentioned embodiment, and description is abbreviate|omitted here. This also applies to the following embodiments.

[0060] A sensor 41 is arranged in the light source device, and the sensor 41 is different from usual ones for detecting that the luminous tube 11 or the outer tube 15 falls off from the support member 14 during driving, or that either the luminous tube 11 or the outer tube 15 may be broken. Abnormal patterns such as impact, application of external pressure, or cracking are detected. As the sensor 41 , an acoustic sensor that detects the sound of glass cracking and outputs a detection signal, a vibration shock sensor that detects vibration due to impact or external pressure and outputs a detection signal, etc....

Embodiment approach 3

[0063] Figure 5 This is used to describe Embodiment 3 related to the light source device. In this embodiment, the portion of the light emitting region 11a of the arc tube 11 is formed into a dome shape whose outside is larger than the outer shape of the straight tube region 11b. In this case, too, the phosphor layer 12 has a shape corresponding to a portion exposed outside the outer shape of the straight pipe region 11b.

[0064] In the case of this embodiment, white light can also be emitted toward the base 18 as shown by the hollow arrow in the figure, and an electric lamp closer to an incandescent lamp can be realized. Therefore, in the case of a downlight with a reflector, the reflector can be effectively used.

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Abstract

Disclosed is a light source device that is a globe-type light source that uses a laser diode (LD) and that obtains white light emission with a high light flux and is almost uniform in all directions. The light source device has a dual-tube structure comprising a transparent light-emitting tube (11) and a transparent outer tube (15). The light-emitting tube (11) is sealed (112) and the tip of the straight tube (111) is rounded. A fluorescent material layer (12) is formed on an inner surface of a light-emitting region (11a) in the light-emitting tube (11) in the vicinity of the seal (112) and a reflective film (13) is formed on an inner surface of a straight tube region (11b) which is a non-light-emitting section of the light-emitting tube (11). The outer tube (15) is frosted (151). The LD (16) with suppressed temperature increase and attached to a heat radiator (17) is disposed on the release end section of the light-emitting tube (11) and the fluorescent material emits light by the LD (16) radiating laser light on the fluorescent material layer (12). This enables white light emission that has high light flux and is almost uniform in all direction to be obtained while using an LD.

Description

technical field [0001] An embodiment of the present invention relates to a light bulb type light source device that irradiates a phosphor with light emitted from a laser diode (LD) as excitation light of the phosphor to obtain white light. Background technique [0002] Conventionally, in a light source device using an ultraviolet light-emitting diode (UV-LED) or a blue light-emitting diode, a phosphor is irradiated with ultraviolet light or blue light to emit white light. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Laid-Open No. 2001-156338 Contents of the invention [0006] [Problem to be Solved by the Invention] [0007] In the above-mentioned technique of Patent Document 1, since ultraviolet light is irradiated from the UV-LED to the phosphor layer on the inner surface of the front end of the glass tube, and visible light is radiated from the phosphor, there are advantages in that power consumption is lower than...

Claims

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Application Information

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IPC IPC(8): F21S2/00F21V3/04F21V29/00H01S5/022F21Y101/02
CPCH01S5/02469F21Y2101/025F21K9/56F21V9/16F21K9/135H01S5/02208F21Y2101/02F21V3/0418F21V13/02F21K9/232F21K9/64F21Y2115/30F21Y2115/10F21V3/061H01S5/0087
Inventor 武田雄士
Owner TOSHIBA LIGHTING & TECH CORP
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