Automatic controller

Details Automatic controller Automatic controller

2000-01-05

2000-11-28

Martin, David

Land vehicles: wheels and axles

Wheel

Compression wheel

318610, 318 66, G05B 1136

Patent

active

061525421

ABSTRACT:
To drive a lens part by a servo motor, an automatic controller turns on the first switch to input a desired value to an error amplifier from a final controlling element, and turns off the second switch to activate a feedback circuit which performs negative feedback. On the other hand, if the desired value is 0, or if the final controlling element does not work, the automatic controller turns off the first switch to shut out the desired value from the final controlling element, and turns on the second switch to activate the feedback circuit which performs positive feedback. This enables hand operation of the lens part with support of the positive feedback.

REFERENCES:
patent: 4408148 (1983-10-01), Herzog
patent: 4415966 (1983-11-01), Herzog
patent: 5107193 (1992-04-01), Iwashita
patent: 5134354 (1992-07-01), Yamamotor et al.
patent: 5231442 (1993-07-01), Kitazawa et al.
patent: 5418440 (1995-05-01), Sakaguchi et al.
patent: 6020709 (2000-02-01), Sasaki

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