| 摘要 |
PURPOSE:To improve resolution while irradiating the sufficient quantity of light by arranging an optical parts changing the quantity of transmitted light or its transmitting direction in accordance with the incident angle of incident light between photodetecting parts and an original reader. CONSTITUTION:The photodetecting parts 2 are formed on a transparent substrate 1 of a photosensor consisting of glass or the like with prescribed intervals and then a transparent protecting layer 3 is formed on the photodetecting parts 2. The transparent protecting layer 3 is coated with an interference film 6 and light from an original 4 to be read out is applied to the photodetecting parts 2 through an air layer 5, the interference film 6 and the transparent protecting layer 3. The interference film 6 is a normal thin film formed as a reflection preventing film, and is designed so that its transmittivity is increased when the incident angle is small, and reduced when the angle is large. Light arriving at each photoreceiving part is limited to the reflected light from portions close to the nearest original part, so that reading with high resolution is attained.
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