PURPOSE: To enable a manuscript dweetly under a photoelectrical conversion layer to be brightly illuminated so as to improve a sensor in sensitivity by a method wherein an incident window through which illuminating light is made to impinge is provided to an optical shielding layer, and a light transmitting window larger than the incident window concerned is provided to the photoelectrical conversion layer overlapping the incident window.
CONSTITUTION: A photoelectric conversion layer 50 and an optical shielding layer 40 covering the layer 50 are successively provided to the face of an EMA type FAP 10 opposite to a manuscript through the intermediary of a light transmitting body, and an incident window 46 through which illuminating light is made to impinge is provided to the optical shielding layer 40, a light transmitting window larger than the incident window concerned is provided to the photoelectric conversion layer 50 overlapping the incident window 46. The illuminating light incident window 46 provided to the optical shielding layer 40 and the light transmitting window 56 provided to the photoelectric conversion layer are formed into rectangular shapes whose long sides extend in an auxiliary scanning direction. The area of the illuminating light incident window 46 is determined depending on the balance between the volume of incident light and the sensitivity of a sensor, and it is adequate that the short side of the window 46 is set as long as 20-60% of the width of a photoelectric conversion layer photodetective part 54 in a primary scanning direction, and the long side is set as long as 70-95% of the width of the photodetective part 54 in an auxiliary scanning direction.
MURAKAMI SATORU
KUWATA TAKESHI
KOGA AKIHIRO
MARUYAMA TSUTOMU
ASAHI GLASS CO LTD
Next Patent: ERROR CORRECTING CIRCUIT