Optical scale encoder with light intensity alarm

Details Optical scale encoder with light intensity alarm Optical scale encoder with light intensity alarm

1990-06-01

1991-09-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, G01D 534

Patent

active

050515799

ABSTRACT:
An encoder for measuring movement of an optical scale by photoelectrically converting light from the optical scale obtained by applying light from a light source to the optical scale, by means of light receiving element, includes detector for detecting a variation in intensity of the light received by the light receiving element and a comparator for comparing a signal from the detector with a predetermined reference signal. Consequently, a predetermined alarm signal is generated on the basis of the result of comparison obtained from the comparator. A measuring system for detecting a moving condition of an object, includes an optical scale connected to the object; a light source for applying light to the optical scale; a first detector for receiving light from the optical scale and for detecting the moving condition of the object; a second detector for detecting a variation in intensity of the light received by the first detector; and a signal forming device for forming a predetermined alarm signal on the basis of an output signal from the second detector.

REFERENCES:
patent: 3756723 (1973-09-01), Hock
patent: 3944813 (1976-03-01), Fowler
patent: 4536762 (1985-08-01), Moates
patent: 4587485 (1986-05-01), Papiernik
patent: 4629886 (1986-12-01), Akiyama et al.
patent: 4676645 (1987-06-01), Taniguchi et al.

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