Method and apparatus for correcting position errors using writab

Details Method and apparatus for correcting position errors using writab Method and apparatus for correcting position errors using writab

1988-07-13

1990-08-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023113, H01J 314

Patent

active

049508903

ABSTRACT:
A method and apparatus for correcting position errors, both linear and rotary is disclosed. In this method a blank encoder is mounted on the system and the position of the part to be controlled is measured. Lines are written on the blank encoder corresponding to equal increments of the position of the controlled part rather than equal increments on the encoder. In this method many of the system positional errors are cancelled. The blank encoder is made of laser recordable material and the writing is achieved by forming a beam of a laser diode into a line. Reading is achieved using the same optical system at a lower power level.

REFERENCES:
patent: 4079251 (1978-03-01), Osann, Jr.
patent: 4122336 (1978-10-01), Pomerantz
patent: 4152588 (1979-05-01), Klatt et al.

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