Browse Prior Art Database

LOW COST ROTARY POSITION SENSOR

IP.com Disclosure Number: IPCOM000027789D
Original Publication Date: 1999-Oct-31
Included in the Prior Art Database: 2004-Apr-09
Document File: 4 page(s) / 117K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is a low cost optical rotary position sensor having application to mid-volume electrophotographic printers and copiers as a feedback sensor controlling the position of backer bars and cleaning assembly. The sensor replaces a one-half revolution clutch and a one revolution clutch with active servo controlled position systems to improve machine reliability, robustness, and service life. Alignment of the optical rotary position sensor is not critical due to the geometry of the sensor disk pattern and optical sensor. As a result, motor sensor assembly would not require expensive alignment fixtures or operator finesse. Minimal support electronics is required and may be a customized Integrated Circuit (IC) in the Very Large Scale Integration (VLSI) category.

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Page 1 of 4

XEROX DISCLOSURE JOURNAL

LOW COST ROTARY POSITION SENSOR

C1.3991075 S. U. Proposed John J. Ricciardelli Classification

Int. C1. G03g 15/00

20

I

FIG. 7 FIG. 2

XEROX DISCLOSURE JOURNAL - Vol. 24 No. 5 September/October 1999 197

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Page 2 of 4

LOW COST ROTARY POSITION SENSOR (Cont'd)

U

OUTPUT

28

FIG. 3

Disclosed is a low cost optical rotary position sensor having application to mid-volume electrophotographic printers and copiers as a feedback sensor controlling the position of backer bars and cleaning assembly. The sensor replaces a one-half revolution clutch and a one revolution clutch with active servo controlled position systems to improve machine reliability, robustness, and service life. Alignment of the optical rotary position sensor is not critical due to the geometry of the sensor disk pattern and optical sensor. As a result, motor sensor assembly would not require expensive alignment fixtures or operator finesse. Minimal support electronics is required and may be a customized Integrated Circuit (IC) in the Very Large Scale Integration (VLSI) category.

198 XEROX DISCLOSURE JOURNAL - Vol. 24 No. 5 SeptembedOctober 1999

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Page 3 of 4

LOW COST ROTARY POSITION SENSOR (Cont'd)

Figure 1 descriptively illustrates sensor disk 10 and sensor 12. Sensor 12 is composed of a photodetector 14 and an illumination source 16, as shown in Figure 2. Referring to Figure 1, sensor disk 10 further comprises a transparent portion 18 and two opaque patterns 20 and 22. The transparent portion 18 may be glass, plastic, or some material transparent or semi-transparent to illumination source 16 (Figure 2). The opaque patterns 20 and 22 are applied to the disk 10. A negative pattern may be used, but it is not desirable if increased background noise is generated therefrom. The angular position is a function of the amount of light emitted by the illumination source 16 that is i...