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AssigneeFujitsu Limited
InventorsHideo Nasu, Kenji Umehara, Kazuhiro Kakuguchi
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An optically transparent dustproof plate provided to a reflex type optical sheet sensor being for detecting passage of a sheet, transferred in front of the sheet sensor, by irradiating light from a light source provided in the sheet sensor to the sheet and receiving light reflected from the sheet at a light sensor provided in the sheet sensor, the sheet sensor being for protecting the light source and the light sensor from dust and having an outer surface, which faces outside of the dustproof plate, roughed for dispersing the irradiating light so as to decrease light reflected at the outer surface and received to the light sensor and an inner surface, which faces inside of the sheet sensor, inclined against the irradiating light so as to prevent light reflected at the inner surface from directing to the light sensor.
A reflex type optical object sensor (106) for optically detecting passage of objects (300) by irradiating light, which is emitted from the object sensor, on a surface of the object and receiving light reflected from the surface of the object, said object sensor comprising:
A reflex type optical sheet sensor (106) provided in a serial printer, for optically detecting passage of sheets (200) of paper by irradiating light, which is emitted from the sheet sensor, on a surface of the sheet and receiving light reflected from the surface of the sheet, said sheet sensor comprising:
Dependencies are inferred from the claim text.