Fluorescent light source device

Abstract

Provided is a fluorescent light source device with which, when excitation light is emitted to a wavelength conversion member, rearward scattering of the excitation light is controlled and fluorescence generated inside the wavelength conversion member can be emitted to the outside with high efficiency, and with which high light-emitting efficiency can be obtained. The fluorescent light source device comprises a wavelength conversion member which uses phosphors that are excited by excitation light, and is characterized in that the wavelength conversion member has formed on a front surface thereof serving as an excitation light receiving surface a front-surface-side periodic structure, has formed on a rear surface thereof a rear-surface-side periodic structure, and has a light reflecting surface disposed on the outside of the rear surface.

Description

technical field [0001] The present invention relates to a fluorescent light source device that excites a phosphor with excitation light to emit fluorescence from the phosphor. Background technique [0002] As a green light source used in, for example, a projector, there has been known a fluorescent light source device that emits green light from a fluorescent body by irradiating laser light to the fluorescent body. As an example of such a fluorescent light source device, there is known a fluorescent light source device that includes a wavelength conversion member formed by coating a phosphor on the surface of a rotating wheel, and irradiates the wavelength conversion member with laser light in the blue region. , light in the green region is generated in the phosphor in the wavelength conversion member (see Patent Document 1). [0003] Specifically, in Patent Document 1, a fluorescent light source device as described below is used: Figure 17 As shown, a green light source o...

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Problems solved by technology

[0005] However, the configuration of the driving system of the fluorescent wheel 72 including the wheel motor 73 is complicated, and there is a problem that the wheel motor 73 cannot obtain a long service life due to deterioration of constituent members.

[0007] However, such a fluorescent light source device has the problem that high luminous efficiency cannot be obtained

[0008] Specifically, there is a problem that when the excitation light is irradiated to the wavelength conversion member 61, the excitation light is backscattered at the surface of the wavelength conversion member 61, so that the excitation light cannot be sufficiently absorbed into the wavelength conversion member 61. Inside of member 61

In addition, there is a problem that in the wavelength conversion member 61, among the fluorescence generated by the phosphor, the fluorescence whose incident angle exceeds the critical angle with respect to the interface between the wavelength conversion member 61 and air is enclosed in the inside of the wavelength conversion member 61, Therefore, the fluorescence cannot be effectively used

[0009] In addition, in the device described in Patent Document 2, there is a problem that since the fluorescence emitted from the phosphor is diffused in all directions and is emitted, it cannot be efficiently emitted from the side surface of the wavelength conversion member 61. to use

[0010] In addition, there is a problem that, since barium sulfate has low thermal conductivity, when barium sulfate is used as a diffuse reflection member, heat cannot be efficiently released.

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