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:
Feb. 19, 2002
Filed:
Feb. 08, 1999
Hideyuki Kitajima, Tokyo, JP;
Copyer Co., Ltd., Tokyo, JP;
Abstract
A media detection method and device which can detect media precisely in spite of individual variations and mechanical assembly errors of optical sensors and contamination of light emitting and receiving parts of the optical sensors, and which, even when the medium is not yet provided, can make setting for medium detection and precisely detect the medium in a short time; wherein first, a comparison reference voltage of the differential amplifier ( ) is set at 0 volts and the output of the differential amplifier ( ) corresponding to the output of the optical sensor ( ) is determined when or where a medium is absent; by applying the output of the differential amplifier ( ) to a predetermined formula, a comparison reference voltage to be given to the differential amplifier ( ) during the medium detection operation is determined; next, during the actual medium detection operation, this comparison reference voltage is applied to the differential amplifier ( ) and the amplifier output is compared with a predetermined threshold to judge the presence or absence of the medium.