Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1992-03-09
1994-12-06
Stephan, Steven L.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
354457, H01L 4108, G03B 708
Patent
active
053714270
ABSTRACT:
There is disclosed a driving device for piezoelectric actuator, in which a voltage is applied to a piezoelectric actuator to generate a mechanical deformation therein, thus actuating a mechanical system. In an aspect, the piezoelectric actuator is at first given a voltage of inverse polarity, for generating a displacement in an opposite direction, and then given a voltage of forward polarity, for generating a displacement in the normal functioning direction, thereby actuating the mechanical system. Displacement and acceleration become larger, as the displacement of the actuator takes place from a position in the inverse direction. In another aspect, the electrical insulation state of the piezoelectric actuator is detected, and, if deteriorated, the destruction of insulation is prevented by an alarm generation and/or inhibition of voltage application. In an embodiment, the insulation state is identified from the ambient humidity of the actuator. In another aspect, if the detected humidity is at a high level that may induce destruction of insulation, the piezoelectric actuator is driven with a low voltage, in order to dehumidity by heat generation. Also shutter control devices for camera, utilizing piezoelectric actuator, are disclosed.
REFERENCES:
patent: 3742492 (1973-06-01), Proctor
patent: 3921015 (1975-11-01), Obeda et al.
patent: 4093885 (1978-06-01), Brown
patent: 4420235 (1983-12-01), Terada
patent: 4689516 (1987-08-01), Yokoyama et al.
patent: 4760351 (1988-07-01), Newell et al.
patent: 4799078 (1989-01-01), Hayama
patent: 4811044 (1989-03-01), Tanaka et al.
patent: 4851870 (1989-07-01), Tanaka et al.
patent: 4882602 (1989-11-01), Tanaka et al.
patent: 4920373 (1990-04-01), Tominaga et al.
patent: 5053668 (1991-10-01), Mitsuyasu
patent: 5138217 (1992-08-01), Wada et al.
Patent Abstracts of Japan, vol. 13, No. 40 (P-820), Jan. 30, 1989.
Patent Abstracts of Japan, vol. 9, No. 323 (P-414), Dec. 18, 1985.
Patent Abstracts of Japan, vol. 13, No. 303 (P-896), Jul. 12, 1989.
Patent Abstracts of Japan, vol. 13, No. 358 (P-916), Aug. 10, 1989.
Goto Tetsuro
Hasuda Masanori
Katayama Akira
Tanabe Yoshiaki
LaBalle C.
Nikon Corporation
Stephan Steven L.
LandOfFree
Driver for piezoelectric actuator and shutter control device uti does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Driver for piezoelectric actuator and shutter control device uti, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Driver for piezoelectric actuator and shutter control device uti will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-216954