US Patent No: 4,453,816

Number of patents in Portfolio can not be more than 2000

Method and means for controlling the aperture blades of a camera through pulse motors

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Abstract

The invention is directed to an improved method and apparatus for controlling the aperture blades of a camera in which the aperture stop-down position is controlled by the number of pulses applied to pulse motors. In the present case, the unit-pulse numbers which determine the aperture stop-down position are split into at least two groups, one of which is a multiple of the other, and the blades are moved into the desired position by applying both groups of pulses to the pulse motors.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
KONICA CORPORATIONTOKYO4284

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hiraike, Fumiaki Hachioji, JP 10 68

Cited Art

Patent Info (Count) # Cites Year
 
CANON KABUSHIKI KAISHA (1)
4,367,931 Electromagnetically driven diaphragm device 7 1980
 
OLYMPUS OPTICAL CO., LTD. (1)
4,344,678 Diaphragm control device for camera 7 1980

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
DELTA ELECTRONICS, INC. (3)
7,059,830 Axial-flow serial fan 0 2003
7,238,004 Serial fan with a plurality of rotor vanes 1 2003
7,740,446 Serial fan with a plurality of rotor vanes 1 2007
 
SENSHIN CAPITAL, LLC (2)
4,879,592 Camera with two-bladed shutter mechanism with multiple filter apertures disposed for relative movement to provide sequential color separation exposures 17 1988
4,827,348 Exposure control system for dual mode electronic imaging camera 46 1988