1977-07-21
1979-05-15
Gonzales, John
354150, 354202, G09B 1700, G09B 1750
Patent
active
041545184
ABSTRACT:
A photographic camera of the type having at least one reflection mirror positioned in a space between an objective lens optical system and a film plane so that an image bearing beam of light rays entering through the objective lens optical system after reflection from the mirror is deflected to the film plane, includes a dustproof shutter device for sealing the space containing the mirror from a film casette chamber when a film casette is loaded in the chamber therefor, in order to prevent dust and other falling particles from entering a photo-taking optical system chamber containing the mirror through an opening for the loading and removal of the film cassette.
REFERENCES:
patent: 3608456 (1971-09-01), Hauser
patent: 3754458 (1973-08-01), Plummer
patent: 4109259 (1978-08-01), Tarr
Ito Fumio
Yazaki Mutsunobu
Canon Kabushiki Kaisha
Gonzales John
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