Readhead for producing signals when travelling along a scale hav

Details Readhead for producing signals when travelling along a scale hav Readhead for producing signals when travelling along a scale hav

1992-05-11

1993-08-31

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, 32420722, 324 7678, G01D 534

Patent

active

052411737

ABSTRACT:
A readhead 10 traverses along a scale 12, producing square wave signals in quadrature on lines 24,26. These are counted by an external counter 28 to indicate the position along the scale. The square waves cannot be used to monitor the orientation and stand-off of the readhead 10 relative to the scale 12. To achieve this, therefore, circuitry within the readhead 10 monitors the sinusoidal quadrature signals from which the square waves are produced, and gives a simple go
o-go indication on a LED 62 when these signals have an acceptable amplitude and are in an acceptable quadrature relationship.

REFERENCES:
patent: 4459583 (1984-07-01), van der Walt et al.
patent: 4949289 (1990-08-01), Stephens et al.
patent: 4959542 (1990-09-01), Stephens
patent: 5128609 (1992-07-01), Howley
Patent Abstracts of Japan; vol. 013, No. 239 (P-879) 6 Jun. 1989 & JP-A-01 042 797 (Fuji Electric Co Ltd) 15 Feb. 1989, Abstract.

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