| 摘要 |
A flash device comprises a light source and an optical system for projecting light emitted from the light source onto an object, the optical system having a transparent member which is tapered toward the light source. The transparent member has an entrance surface, an exit surface opposed to the entrance surface, and a reflecting surface lying between the entrance surface and the exit surface. Part of the light emitted from the light source is made incident on the entrance surface and then exits from the exit surface after having been reflected at the reflecting surface.
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