Flash photographing system
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United States of America Patent
Stats
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Feb 11, 1986
Issued Date -
N/A
app pub date -
May 15, 1985
filing date -
Dec 4, 1981
priority date (Note) -
Expired
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Abstract
A flash device for a photographic camera either inhibits a flashing action or shifts the control mode of the camera from flash photography to daylight photography in cases where the object to be photographed is located outside of an adequately operable distance range. A pre-flashing action detects a distance to the object when a main capacitor is charged to a given level before the capacitor is fully charged for flash photography. Then flash photography is performed at an aperture value determined on the basis of the detected distance when the distance is within the adequately operable distance range. When the detected distance is outside of the adequately operable distance range, the main capacitor is further charged for an increased flashing power. Then the distance to the object is again detected by a second preflashing action before flash photography is carried out at an aperture value determined on the basis of the distance detected by the second pre-flashing action. The flash photography arrangement thus permits seizing a shutter chance for flash photographing an object located at a relatively short distance without waiting until the main capacitor is fully charged.
First Claim
Family
- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- CANON KABUSHIKI KAISHA
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Kataoka, Hiroyuki | Saitama, JP | 72 | 942 |
Suzuki, Nobuyuki | Kanagawa, JP | 340 | 3584 |
Yamada, Masanori | Kanagawa, JP | 136 | 1460 |
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Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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