Optics: motion pictures – Camera and/or projector drive mechanisms – With single frame operation
Patent
1972-02-15
1976-04-13
Hayes, Monroe H.
Optics: motion pictures
Camera and/or projector drive mechanisms
With single frame operation
352121, 352137, 352177, G03B 2138
Patent
active
039500845
ABSTRACT:
A motion picture camera wherein a rotary shutter can be arrested in a first or a second angular position in which its blade respectively overlies and is out of register with the light-admitting aperture. In order to terminate a long exposure which is started with stoppage of the shutter in the second angular position, the user must close an auxiliary switch serving to energize an electromagnet which starts an electric motor for the shutter and simultaneously withdraws a tooth of a pivotable intercepting lever from the path of movement of two projections on the shutter. The first projection approaches and engages the tooth when the shutter is to be arrested in the first position, and the second projection approaches and engages the tooth in the second position of the shutter. The control system which times the entry of the tooth into the path of the oncoming first or second projection comprises a contact plate which rotates with the shutter and is tracked by two elastic contacts a selected one of which can be connected in the circuit of the electromagnet by a two-way switch. The contact plate carries two angularly and radially offset insulators. When one of the insulators engage one of the elastic contacts which one contact is then connected in the circuit of the electromagnet, the electromagnet is deenergized and allows a spring to move the tooth into the path of the oncoming first projection on the shutter. When the other insulator engages the other elastic contact (which other contact is then connected in the circuit of the electromagnet), the electromagnet is deenergized and allows the spring to move the tooth into the path of the second projection on the shutter.
REFERENCES:
patent: 2462302 (1949-02-01), Bolsey
patent: 3397937 (1968-08-01), Schrader
patent: 3520598 (1970-07-01), Murata
patent: 3601481 (1971-08-01), Kessler
patent: 3603678 (1971-09-01), Anderl
Hayes Monroe H.
Robert Bosch Photokino G.m.b.H.
Striker Michael J.
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