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. 22, 2000
Filed:
Jan. 20, 1998
Thomas F Uhling, Vancouver, WA (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
A detector for use in detecting at least one mark on a sheet of print media used in a printing device, the mark indicating at least one characteristic of the sheet of print media, is disclosed. The detector includes a source, a sensor, and a bandstop filter. The source generates a first light signal that is directed at the mark on the sheet of print media, the first light signal having a first predetermined wavelength. The sensor is configured to detect a second light signal from the mark on the sheet of print media, the second light signal arising in response to the first light signal and having a second predetermined wavelength. The bandstop filter is positioned between the sensor and the mark on the sheet of print media and is configured to block from the sensor the first predetermined wavelength of the first light signal generated by the source and transmit to the sensor other wavelengths of light, including the second predetermined wavelength of the second light signal. A printing device including the detector is also disclosed. A method of detecting a characteristic of a sheet of print media used in a printing device through the use of a detector is also disclosed. Further characteristics and features of the detector and printing device are described herein. Further characteristics and steps of the method are also described herein.