Apparatus and method for generating calibrated optical encoder p

Details Apparatus and method for generating calibrated optical encoder p Apparatus and method for generating calibrated optical encoder p

1983-05-31

1986-06-03

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

364571, G01D 534

Patent

active

045931933

ABSTRACT:
Timing pulses generated by an incremental optical encoder disc may be nonuniformly spaced due to eccentricity in the disc mounting and inaccuracies in the pulse generating marks. An apparatus and method are disclosed wherein pulse width measurements are made during one revolution of the disc, and from these measurements data relating to pulse delay information are computed and stored in a memory. During operation the leading edge of each encoder pulse is delayed by a period of time related to the stored delay information corresponding to that specific pulse.

REFERENCES:
patent: 4064504 (1977-12-01), Lepetit et al.
patent: 4286790 (1981-09-01), Siryj et al.
patent: 4413212 (1983-11-01), Okamoto et al.
patent: 4441061 (1984-04-01), Yoshida et al.

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