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:
Jun. 28, 1977
Filed:
May. 09, 1975
Tsukumo Nobusawa, Oizumi, JA;
Abstract
A camera is provided with a photo-responsive pulse generator for generating pulses the number of which is determined by the logarithmically converted light intensity at an object which is to be photographed. A reference pulse generator is also provided for generating a series of reference pulses at intervals from one reference pulse to the next which become progressively greater. A shutter-operating plunger is available to the operator to be depressed for tripping the shutter, and this plunger is operatively connected to the photo-responsive pulse generator for activating the latter just prior to opening of the shutter and to the reference pulse generator for activating the latter simultaneously with opening of the shutter. A pulse-responsive structure is operatively connected with both of the pulse generators for receiving first pulses from the photo-responsive pulse generator and then pulses from the reference pulse generator, this pulse-responsive structure providing an output when a predetermined relationship is provided between the reference pulses received from the reference pulse generator and the pulses received from the photo-responsive pulse generator. A shutter-closing structure responds to the latter output for closing the shutter.