Encoder for detecting movement of an object

Details Encoder for detecting movement of an object Encoder for detecting movement of an object

2007-05-08

2007-05-08

Le, Que Tan (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S205000

Reexamination Certificate

active

11076083

ABSTRACT:
An encoder for stably detecting the amount of movement of an object. The encoder includes an LED for emitting light toward a rotor plate including slits. An optical sensor generates an ON signal when the amount of emitted light passing through the slits exceeds a threshold value. A current increasing circuit increases the amount of current flowing through the LED when the optical sensor generates an ON signal.

REFERENCES:
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patent: 4593194 (1986-06-01), Graham et al.
patent: 4649267 (1987-03-01), Ray
patent: 5015836 (1991-05-01), Van Antwerp
patent: 2002-98522 (2002-04-01), None

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