The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 14, 1997
Filed:
Feb. 21, 1995
Hans-Jurgen Meyer, Tucson, AZ (US);
Photometrics, Ltd, Tucson, AZ (US);
Abstract
A mechanical camera shutter requiring voltage in the range of 30 to 60 volts is made to operate from a power supply which provides voltage such lower than is necessary for shutter operation by the inclusion of a capacitor which is charged to 15 volts. The capacitor is operated to add to the insufficient voltage of a power source to provide the requisite high voltage during a critical part of a cycle of operation of the shutter. The shutter driver circuit follows results from the recognition that the shutter requires the high voltage only during the short opening phase of the shutter cycle and is not required during the later holding phase when only a low holding voltage is required. The capacitor is recharged during the holding phase and provides the necessary increased voltage for the next shutter operation.