Shutter actuating device

Details Shutter actuating device Shutter actuating device

1988-06-16

1989-03-07

Adams, Russell E.

3542341, 3542711, 354484, G03B 7096

Patent

active

048110442

ABSTRACT:
A shutter actuating device of the type employing a piezoelectric element as an actuating element which attains stabilization of the shutter opening speed of a shutter device. The device includes a piezoelectric element charging circuit which charges a piezoelectric element with constant current so that the rising speed of the charged voltage of the piezoelectric element may be maintained constant. Means is also disclosed for minimizing a time lag until a minimum aperture for exposure is reached after triggering of a shutter release operation. Higher constant charging current is supplied to the piezoelectric element until a time just before the minimum aperture for exposure is presented, and after then the piezoelectric element is charged with lower constant current.

REFERENCES:
patent: 4119979 (1978-10-01), Frank et al.
patent: 4162832 (1979-07-01), Frank et al.
patent: 4190336 (1980-02-01), Frank et al.
patent: 4198140 (1980-04-01), Frank et al.
patent: 4234245 (1980-11-01), Toda et al.
patent: 4322145 (1982-02-01), Yamada et al.
patent: 4609275 (1986-09-01), Ishiguro
Japan Camera Trade News, May 1987, vol. 38, No. 5, New Products Section.

Affiliated with

Also associated with

Rating

Shutter actuating device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Shutter actuating device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Shutter actuating device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1672346