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:
Jan. 06, 2004
Filed:
Jan. 31, 2002
Shinya Kawanishi, Tenri, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
Infrared light emitted from an infrared light-emitting diode and reflected by a toner that is an object to be detected. Then, the reflection light is received by a photodiode. A signal detection circuit is composed of an amplifier for converting an output current into a voltage, an amplifier in which a circuit constant is optimized for detection of color toner density, an amplifier in which a circuit constant is optimized for detection of black toner density and an amplifier in a circuit constant is optimized for detection of toner misregistration. These amplifiers are connected to each other in two steps. The first step amplifier's output is further amplified by the second step amplifiers to output as a color toner detection output voltage Vo a black toner detection output voltage Vo and a toner misregistration detection output voltage Vo