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Solid state lighting device

A lighting device, solid technology, applied in the direction of lighting devices, components of lighting devices, safety devices of lighting devices, etc., can solve the problems of insufficient abnormality detection sensitivity, etc., and achieve the effect of good sensitivity and improved safety

Inactive Publication Date: 2014-10-01
TOSHIBA LIGHTING & TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the position for detecting the return light is not properly selected, the abnormality detection sensitivity becomes insufficient

Method used

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Examples

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Embodiment Construction

[0019] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0020] figure 1 It is a block diagram of the solid-state lighting device of the first embodiment.

[0021] The solid-state lighting device includes an irradiation unit 10 , a scattering unit 20 , a wavelength conversion layer 40 , a support plate 50 , a return light guide unit 90 , a light receiving unit 94 , and a control circuit 80 .

[0022] The irradiation unit 10 has a light source 12 such as a semiconductor laser element and a drive circuit 13 thereof. The irradiation unit 10 may further include a light guide unit 11 that transmits the laser beam 70 from the light source 12 . If the light guide part 11 is an optical fiber, it can guide the laser beam introduced into one end part and emit it toward the scattering part 20 from the other end part. The wavelength of the laser beam 70 may be, for example, a wavelength of 380 to 490 nm.

[0023] The scattering unit ...

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PUM

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Abstract

According to one embodiment, a solid state lighting device includes an irradiating section (10), a scattering section (20), a wavelength conversion layer (40), a supporting plate (50), a returned light guiding section (90), a light receiving section (94), and a control circuit (80). The irradiating section (10) emits laser light (70). The scattering section (20) has a plane provided to cross an optical axis of the laser light (70) and includes a light scattering material that reflects the laser light (70) and emits the laser light (70) as scattered light (72). The wavelength conversion layer (40) absorbs the scattered light (72) made incident thereon and emits wavelength-converted light (73) having a wavelength longer than the wavelength of the scattered light (72). The supporting plate (50) has a light incident surface on which the wavelength conversion layer (40) is provided and a light emission surface. The scattered light (72) and the wavelength-converted light (73) change to returned light (92) and propagate through the inside of the supporting plate (50). The returned light (92) is introduced into the returned light guiding section (90). The light receiving section (94) detects the returned light (92). When a detected light amount of the returned light (92) is outside a predetermined range, the control circuit (80) outputs an emission stop signal for the laser light (70) to the irradiating section (10).

Description

technical field [0001] The invention relates to a solid state lighting device. Background technique [0002] White solid-state lighting (SSL: Solid-State Lighting) devices have semiconductor light-emitting elements such as LED (Light Emitting Diode) or LD (Laser Diode), or wavelength conversion layers. [0003] Higher luminance and higher output are strongly required for solid-state lighting devices. Therefore, the output of light emitted from a semiconductor light-emitting element or wavelength-converted light generated by a wavelength conversion layer is increasingly required to be higher. [0004] Therefore, when the light emitted from the light-emitting element or the wavelength conversion layer is not emitted normally, it is preferable that the solid-state lighting device has a self-diagnosis function capable of detecting an abnormality in view of safety. [0005] When return light generated in the lighting device is used, abnormality of the lighting light can be dete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21V13/12F21V23/00F21Y101/02H05B44/00
CPCH05B33/08F21V25/04F21K9/56H01S5/06F21K9/52F21V23/0457F21K9/61F21K9/64H05B47/00F21V9/08
Inventor 石川真人
Owner TOSHIBA LIGHTING & TECH CORP