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:
Jul. 29, 1986
Filed:
Sep. 27, 1983
Kwok Y Chan, Quarry Bay, HK;
W. Haking Enterprises Limited, North Point, HK;
Abstract
A completely mechanical disc film camera features film advance and shutter actuation by direct mechanical coupling to an external shutter release button. Shutter button actuation is automatically blocked after the fifteenth frame so as to prevent double exposure and film tearing. Selective film-flattening back pressure is applied to the disc film cassette during the terminal phase of the shutter depression stroke immediately prior to shutter tripping so as to hold the film in the proper imaging plane. Back pressure is released during the film advancing phase to as to relieve system loads and avoid film scratching. The film advance is secured by the oscillatory movement of a film notch engaging pawl carried by a claw driven into oscillatory motion by operation of the shutter button. Means are provided for coupling additional mass to the claw during the terminal phase of the film advancing stroke to reduce the speed of film advance, thereby providing protection against film overtravel. To provide for proper initial film advance when a fresh cassette is inserted an automatic film advancing operation is carried out responsive to closure of the door loading system.