Photoelectric drive circuit for a piezoelectric bimorph element

Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices

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310311, 310332, H01L 4108

Patent

active

044171692

ABSTRACT:
A photoelectric circuit arrangement includes one direct current voltage source and first and second photoconductive networks, each comprising at least one resistance and one photoconductive cell. An output voltage generated between two output terminals of the first and second networks is directly applied to a bimorph element used to close or open a blind. The strong light causes the networks to be in low resistive state so as to produce the output voltage of one polarity to bend the bimorph in one direction and thereby to tend to close the blind, while the weak light causes the networks to be in high resistive state so as to produce the output voltage of the other polarity to bend the bimorph in the opposite direction and thereby to tend to open the blind. The first and second photoconductive networks can be integrated in one body.

REFERENCES:
patent: 2054380 (1936-09-01), Lamb
patent: 2499484 (1950-03-01), Friend
patent: 3152317 (1964-10-01), Mayer
patent: 3321632 (1967-05-01), Wood
patent: 3582658 (1971-06-01), Mita
patent: 3585416 (1971-06-01), Mellen

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