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Lighting Device

A technology for lighting devices and irradiating parts, which is applied to lighting devices, components of lighting devices, lighting and heating equipment, etc., can solve the problems of light extraction efficiency decline, and achieve the effect of improving light extraction efficiency and safety

Inactive Publication Date: 2014-09-10
TOSHIBA LIGHTING & TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the light extraction efficiency will decrease

Method used

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Embodiment Construction

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

[0020] FIG. 1( a ) is a schematic plan view of the lighting device according to the first embodiment, and FIG. 1( b ) is a schematic cross-sectional view along line A-A.

[0021] The solid-state lighting device has an irradiation unit 10 , a scattering unit 20 , and a wavelength conversion unit 40 . The irradiation unit 10 has a light source such as a semiconductor laser, and emits laser light 70 .

[0022] The wavelength of the laser light 70 may be, for example, a wavelength of 380 to 490 nm. In addition, the irradiation unit 10 further includes a light guide (optical fiber) 11 , and transmits and emits laser light from a light source.

[0023] The scattering unit 20 includes a light scattering material 20s that reflects the incident laser light 70 and emits it as scattered light 72 . The scattering part 20 contains Al 2 o 3 , Ca 2 P 2 o 7 , BaSO 4 Such fine ...

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Abstract

The present invention provides a lighting device for improving light extraction efficiency and safety. The lighting device includes an irradiating section (10) configured to emit laser light (70), a scattering section (20), and a wavelength converting section (40). The scattering section (20) has a principal plane provided to cross an optical axis of the laser light (70) and includes a light scattering material that reflects the laser light (70) made incident thereon and emits the laser light (70) as scattered light (72). The wavelength converting section (40) absorbs the scattered light (72) made incident through a first surface and emits wavelength-converted light having a wavelength longer than the wavelength of the laser light (70) from a second surface on a side opposite to the first surface. The scattered light (72) passes through the wavelength converting section (40) while being scattered and is emitted from the second surface.

Description

technical field [0001] The invention relates to a lighting device. Background technique [0002] LED (Light Emitting Diode) has become the mainstream as a light source of a white solid state lighting (SSL: Solid State Lighting) device using a solid light emitting element. [0003] At this time, if the white light-emitting part including the phosphor is provided so as to cover the LED (Light Emitting Diode) chip, a substrate for heat dissipation and power supply of the LED chip is required. If the white light-emitting part is constituted only by the optical system, less heat is generated and the size and weight can be reduced, thereby improving the degree of freedom in design of the lighting device. [0004] For this purpose, for example, a structure may be adopted in which laser light from a semiconductor laser in the blue-violet to blue wavelength range is effectively matched with a light guide and the like to irradiate a wavelength conversion layer such as a phosphor sepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21S2/00F21V13/08F21V8/00
CPCF21V3/0481F21V7/0066F21V9/16F21K9/56F21Y2101/025F21V13/08F21V7/05F21Y2115/30F21Y2115/10F21V3/12F21V9/40F21V9/32F21V7/00F21V9/08
Inventor 池田善久木村吉博
Owner TOSHIBA LIGHTING & TECH CORP
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