Optical encoder with converging means

Details Optical encoder with converging means Optical encoder with converging means

1988-02-25

1989-11-28

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

048839558

ABSTRACT:
An optical encoder comprises a measuring section and a scanning grating plate. The measuring section comprises parallel light beam sources, light receiving elements located in opposition to the parallel light beam sources, converging devices disposed between the parallel light beam sources and the light receiving elements and a main grating plate arranged between the converging devices and the light receiving elements. The scanning grating plate is located between the main grating plate and the light receiving elements while allowing the scanning grating plate to move relative to the measuring section.

REFERENCES:
patent: 3487399 (1969-12-01), Wogatzke
patent: 3950099 (1976-04-01), Malueg
patent: 4112295 (1978-09-01), Dubrik et al.
patent: 4125025 (1978-11-01), Suzuki et al.
patent: 4195909 (1980-04-01), Holle et al.
patent: 4231662 (1980-11-01), Feinland et al.
patent: 4385234 (1983-05-01), Johnson
patent: 4519709 (1985-05-01), Nelle
patent: 4631404 (1986-12-01), Burkhardt et al.
patent: 4689485 (1987-08-01), McMurtry

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