Patent ID: 8157398
Filing Date: 2012-04-17
Classification: G03B

Abstract:
1. A light source unit comprising: a fluorescent plate on which a fluorescent material layer for emitting light in a predetermined wavelength range when light is shone thereonto is disposed; a diffusion plate on which a diffusion layer for emitting light in a diffusing fashion is disposed so as to lie adjacent to the fluorescent material layer; a light source for shining the light onto the fluorescent material layer and the diffusion layer; a driving device for rotating the fluorescent plate and the diffusion plate together; and a light cut-off plate which is formed into a size which covers an area on the diffusion plate where the light is to be shone, wherein the light cut-off plate is rotatable together with the fluorescent plate and the diffusion plate by being locked in a locked state by the diffusion plate, and wherein the light cut-off plate is configured such that when the diffusion plate comes off, the locked state is released, and the light cut-off plate moves to cover an area corresponding to the area on the diffusion plate where the light was shone from the light source before the diffusion plate came off.