Encoder for a printer motor and a printer using the same

Details Encoder for a printer motor and a printer using the same Encoder for a printer motor and a printer using the same

2006-08-14

2009-06-23

Epps, Georgia Y (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S229000

Reexamination Certificate

active

07550711

ABSTRACT:
A light emitter is operable to emit light. A scale comprises a transparent main body and a plurality of marks. The transparent main body has a first face and the second face which is opposite to the first face. The plurality of marks is provided on at least one of the first face and the second face and formed at a predetermined interval, and adapted to reflect or intercept the light emitted from the light emitter. A light detector is operable to detect light reflected by the marks or light passing through a plurality of regions each of which is defined between adjacent ones of the marks. The main body of the scale is formed with a plurality of through holes each of which connects the first face and the second face at one of the regions.

REFERENCES:
patent: 4092533 (1978-05-01), Ohsako et al.
patent: 4203679 (1980-05-01), Duerr et al.
patent: 5657125 (1997-08-01), Kato et al.
patent: 6992278 (2006-01-01), Sjoberg et al.
patent: 2001-232882 (2001-08-01), None
patent: 2003-166856 (2003-06-01), None

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