Electronic flash device

Details Electronic flash device Electronic flash device

1997-01-28

1998-05-12

Adams, Russell E.

Photography

With object illumination for exposure

Multiple flashing from a single unit for a single exposure

G03B 970

Patent

active

057521034

ABSTRACT:
An electronic flash device for use with a camera having a shutter with an aperture that opens gradually. The electronic flash device includes a flash tube having a discharge path; a switching element arranged in the discharge path; and a light emission controller for controlling a light emission of the flash tube during an opening operation of the shutter by repeatedly turning on and off the switching element in accordance with the opening operation of the shutter. Thus, the electronic flash device can reliably maintain an expected photographic effect even in an unstable area of the shutter aperture.

REFERENCES:
patent: 4400087 (1983-08-01), Nakayama
patent: 4592639 (1986-06-01), Nakamura
patent: 4626093 (1986-12-01), Matsui et al.
patent: 4951081 (1990-08-01), Hosomizu et al.
patent: 4985725 (1991-01-01), Serikawa
patent: 5115169 (1992-05-01), Aoki
patent: 5313247 (1994-05-01), Hosomizu et al.
patent: 5491533 (1996-02-01), Sakamoto

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