Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Patent
1998-01-20
2000-02-22
Le, Que T.
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
2504581, 399 84, G01N 2186
Patent
active
060283203
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.
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Anderson Erik A.
Hewlett--Packard Company
Le Que T.
Luu Thanh X.
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