The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 15, 1992
Filed:
Nov. 25, 1991
Fujitsu Limited, Kawasaki, JP;
Abstract
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.