| 摘要 |
PURPOSE:To make illuminations while maintaining the irradiating angle and illuminance neary constant, by installing a fixed light source and a scanning mirror which moves on a parabolic locus having its focal point on the light source. CONSTITUTION:The luminous flux generated from a fixed pole-shaped light source 1a and reflected by a reflector 2a reaches a scanning mirror 3a which moves on a parabolic locus having its focal point on the light source 1a, and then, the luminous flux is reflected by the mirror 3a and irradiate the surface of a manuscript 4 under a condition where the luminous flux is practically a parallel flux. The reflector 2a is set at the behind of the light source 1a, and an optical beam reflected synchronously by the scanning mirror 3a is made to have a directivity. In this way, the light source is fixed, and a compact scanning lighting apparatus which successively irradiates the surface of manuscripts with a narrow space while the irradiating angle and illuminance are maintained neary constant. |
