Patent
Light source unit for projection
Motoo Sugawara,元雄 菅原 +1 more
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TLDR
In this paper, an auxiliary reflecting mirror 66 of a spherical mirror is arranged so as to be deviated a little to the reflecting mirror 60 side from the light emission center of a parabolic mirror.Abstract:
PURPOSE: To improve the utilizing efficiency of light, and also, to improve a peripheral light quantity ratio. CONSTITUTION: In the light source unit for projection for reflecting light from a light emission source 10 and irradiating a body 26 to be projected therewith, and in he outside periphery of an opening end of a reflecting mirror 60 of a parabolic mirror, an auxiliary reflecting mirror 66 of a spherical mirror is provided, a focus F of the reflecting mirror 60 is arranged so as to be deviated a little to the reflecting mirror 60 side from the light emission center 11, the spherical center O of the auxiliary reflecting mirror 66 is arranged in one of a position of a middle point M of the focus F and the light emission center O, and a position deviated a little to the reflecting mirror 60 side from the middle point M, a first irradiation light 61 for irradiating the body 26 to be projected through the reflecting mirror 60 from the light emission soruce 10 is condensed to the inside a little from light being parallel to an optical axis 13, and a second irradiation light 63 for irradiating the body 26 to be projected through the auxiliary reflecting mirror 66 and the reflecting mirror 60 from the light emission source 10 is made parallel to the optical axis 13, or is allowed to diverge to the outside a little from the light being parallel to the optical axis 13. COPYRIGHT: (C)1994,JPO&Japioread more
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