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:
Mar. 02, 1982
Filed:
Nov. 03, 1980
Edwin K Shenk, Westford, MA (US);
Polaroid Corporation, Cambridge, MA (US);
Abstract
A flash camera having a range finder, a blade position sensor for producing an output representative of the position of the displaceable blades of a scanning shutter, a flash firing apparatus that includes a position/distance converter responsive to the output of the range finder for producing a representation of the desired flash-fire position of the blades, and a coincidence detector responsive to the output of the blade position sensor for firing the flash unit when the blades reach the position at which the exposure aperture established by the blades will effect proper flash exposure of the subject. In one embodiment of the invention, the converter is in the form of a digital memory whose addresses represent subject distances and whose contents at a given address represents the fire-flash position for the distance specified by the given address. In a second embodiment of the invention, the fire-flash position is generated from a scaled clock.