Browse Prior Art Database

PROGRAMMABLE TONER AREA COVERAGE SENSOR

IP.com Disclosure Number: IPCOM000026956D
Original Publication Date: 1994-Aug-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 65K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is a programmable toner area coverage sensor (TAC) for use in, for example, electrophotographic printing and copying machines. The ability to use a single sensor design for detecting toner area coverage on different photoreceptor substrate materials enables improved quality control, and reduced parts sourcing and inventory. Photoreceptor belts made from different materials typically have different surface reflectivity characteristics.

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XEROX DISCLOSURE JOURNAL

PROGRAMMABLE TONER AREA Proposed Classification COVERAGE SENSOR US. C1.355/246 Charles J. Mirabella, Jr.

C1. Int. Ralph A. Shoemaker G30g 21/00

Disclosed is a programmable toner area coverage sensor (TAC) for use in, for example, electrophotographic printing and copying machines. The ability to use a single sensor design for detecting toner area coverage on different photoreceptor substrate materials enables improved quality control, and reduced parts sourcing and inventory. Photoreceptor belts made from different materials typically have different surface reflectivity characteristics.

A preferred TAC Sensor is Model 130K 48252, available from TEMIC Co., which is an electro-optic infrared reflective sensor useful in color and or black toner xerographic systems. By sensing the relative amounts of diffuse and specular reflection of a toner patch, the sensor gives an indication of the toner area coverage which can then be correlated to a developed toner mass per unit area. This diffuse specular reflection is dependent on the amount of light shown on and the reflectivity of the photoreceptor surface. By having a selectable LED current drive, and selecting either unused pins 1 or 4 of the sensor, the TAC sensor can be used in a wide variety of machines with different photoreceptor substrates.

REFERENCES

For related toner detection schemes, see US. Patent 4,967,238 and Xerox Disclosure Journal, Vol. 18, No. 4, July/August, 1993, p 373.

XEROX DI...