Contact type reader

Abstract

Abstract PURPOSE:To reduce the generation of noise, by forming a contact section between an original and a photodetecting section of a contact type reader by an alumina single crystal to decrease scratches caused by sliding on the original. CONSTITUTION:An insulating film or light shield layer 8 is formed on a transparent base 7 and formed into a layer by leaving a light leading window 4; and a lower electrode 6, photoelectric member 5 and an input electrode 9 are formed. An alumina single crystal plate 15 is sticked to a passivation film 13 to protect a photodetector section 2 with a transparent adhesives 14. The incident light from a light emitting source 3 penetrates through the light leading window 4 and the alumina single crystal plate 15, it is transmitted on the original 1, the reflecting light transmits through the alumina single crystal plate and detected at a photoelectric conversion section 5'. Since the hardness of the alumina single crystal plate is very large, the scratches on the surface are not produced even with the contact on the original 1 for a long time and the scattering of light between the incident and reflected lights is prevented, allowing to prevent the increase in long-term noise and the reduction in the signal intensity.

Inventors

• 👤 Hisashi Higuchi
• 👤 永 樋口
• 👤 Yasuo Nishiguchi
• 👤 泰夫 西口

Bibliographic Details