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US 4,941,070 AGranted
Flash device for a camera
AssigneeCanon Kabushiki Kaisha
InventorsYukio Ogawa, Kazuo Ikawa, Toru Shoji, Hideo Tamamura, Hiroki Nakayama, Takashi Matsushita
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Abstract
A flash device for a camera of the kind using a miniature lamp type flash tube solves all the problems resulting from the use of the straight tube type flash tube. The disclosed arrangement of the flash device not only ensures an adequate light distributing characteristic in all the vertical and lateral directions but also permits reduction in size of an electronic flash unit.
Claims25
A flash device for a camera comprising:
- (a) a light transmissive sealed body having an opening at one end thereof;
- (b) sealing means for sealing the opening of said light transmissive sealed body;
- (c) cathode and anode electrodes provided on said sealing means and adapted to generate a light producing arc discharged therebetween over an arc discharge route;
- (d) partitioning means for expanding the art discharge route by dividing the inside of said sealed body into a plurality of chambers, and for causing light generated by said flash device to be substantially free of shadow;
- and
- (e) means for forming a trigger electrode and for securing said trigger electrode to said light transmissive sealed body wherein said means for forming and retaining comprises a trigger leaf spring.
3 more elements
A flash device for a camera, comprising:
- (a) a light transmissive sealed body having an opening at one end thereof;
- (b) sealing means for sealing the opening of said light transmissive sealed body;
- (c) cathode and anode electrodes provided on said sealing means and adapted to generate a light producing arc discharged therebetween over an arc discharge route;
- (d) partitioning means for expanding the arc discharge route by dividing the inside of said sealed body into a plurality of chambers;
- and
- (e) optical means for refracting light located a predetermined distance from an optical axis of the flash device and generated by the flash device to cause the light generated by said flash device to be substantially free of shadow caused by said partitioning means.
3 more elements
A flash device for a camera comprising:
- (a) a light transmissive sealed body having an opening at one end thereof;
- (b) sealing means for sealing the opening of said light transmissive sealed body;
- (c) cathode and anode electrodes provided on said sealing means and adapted to generate a light by electric discharge therebetween over an electric discharge route;
- (d) partitioning means for expanding the electric discharged route by dividing the inside of said sealed body into a plurality of chambers;
- and
- (e) optical means for refracting the light so as to make the projected light of said flash device substantially free of shadow caused by said partitioning means.
3 more elements
Dependencies are inferred from the claim text.