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Browse Prior Art Database

ALTERNATIVE GAIN CONTROL FOR AN ETAC SENSOR

IP.com Disclosure Number: IPCOM000027267D
Original Publication Date: 1996-Feb-29
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 74K

Publishing Venue

Xerox Disclosure Journal

Abstract

Proposed is a programmable gain factor for an enhanced toner area coverage (ETAC) sensor. The additional gain increases device sensitivity required to measure the developed mass area (DMA) of black and colored toner patches on xerographic photoreceptors.

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XEROX DISCLOSURE JOURNAL

ALTERNATIVE GAIN CONTROL Proposed Classification FOR AN ETAC SENSOR
Michael D. Borton

U.S. C1.118/689 Int. C1. B05c 11/00

Proposed is a programmable gain factor for an enhanced toner area coverage (ETAC) sensor. The additional gain increases device sensitivity required to measure the developed mass area (DMA) of black and colored toner patches on xerographic photoreceptors.

The ETAC sensor is an extension of an older toner area coverage (TAC) sensor wherein, a diffuse signal is now utilized to extend the sensor range to higher color DMA's. Additional circuitry required to extract the diffuse signal forced the removal of components that provided the TAC sensor with gain while measuring higher DMA's.

One skilled in the art will recognize that gain is a ratio of the increase of output over input in an amplifier. Since the ETAC will be used in applications similar to the TAC, the loss of sensitivity due to reduced gain is a detriment. Gain can be artificially replaced by using a calibration procedure adopted for an analog signal that establishes the operating point of the ETAC sensor. The analog signal is an input to the sensor's illumination source.

DMA is derived by comparing the relative reflectance of a toned patch to that of a clean photoreceptor. Subsequently, the ETAC sensor set-up calibration is performed against a clean photoreceptor. A gain factor may be added with an additional calibration to a known mid-range toner patch. The mid-...