Reflective linear encoder having controlled detector to code...

Details Reflective linear encoder having controlled detector to code... Reflective linear encoder having controlled detector to code...

2007-05-01

2007-05-01

Lee, John R. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S23700G

Reexamination Certificate

active

11378007

ABSTRACT:
An encoder having a code strip, a light emitter, a photodetector, and a spacing member is disclosed. The code strip includes an encoding region having a plurality of reflective and absorptive regions on a carrier having an encoding surface. The light emitter generates a light signal that is reflected from one of the reflective regions. The reflected light is measured by the photodetector. The spacing member maintains a fixed distance between the encoding surface and the photodetector when the code strip moves relative to the photodetector in a travel direction. The spacing member is attached to the photodetector and moves relative to the code strip when the code strip moves relative to the photodetector. A mechanism for allowing one of the photodetector and the code strip to move in a direction perpendicular to the travel direction to accommodate alignment errors can also be included.

REFERENCES:
patent: 4340814 (1982-07-01), DiCiaccio et al.
patent: 4737635 (1988-04-01), Uchida
patent: 5148020 (1992-09-01), Machida

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