Photography – Having variable focal length of camera objective – Having focus operation
Patent
1997-03-17
1998-07-14
Perkey, W. B.
Photography
Having variable focal length of camera objective
Having focus operation
G03B 1336, G02B 709, G02B 710, G02B 728
Patent
active
057818088
ABSTRACT:
Data output means for outputting the moving position data of respective movable lens groups in a zoom lens according to designated magnification data and object distance data is provided, thereby smoothly and easily performing the drive control operation for a zoom lens in which not only the focus-adjusting movable lens but also the power-changing movable lens is moved at the time of focus adjustment. Alternatively, reference data output means for outputting designed moving positions of the respective movable lens groups according to the designated magnification data and object distance data, as well as adjustment data output means for outputting amounts of adjustment corresponding to the individual differences of the respective lenses in the movable lens groups are provided, thereby smoothly, easily, and correctly performing the drive control operation for the zoom lens in which not only the focus-adjusting movable lens but also the power-changing movable lens is moved at the time of focus adjustment. A CPU (11) reads out the moving position data for respective movable lens groups (G2, G4) from first and second tables stored in a ROM (16) according to magnification designation data from a magnification designation operating section (12) and distance designation data from an object distance designation operating section (13), and then transmits predetermined lens drive signals to the movable lens groups (G2 and G4) according to these moving position data. Alternatively, a CPU (111) reads out the moving position reference data for the respective movable lens groups (G2, G4) from first and second tables stored in a ROM (116) according to magnification designation data from a magnification designation operating section (112) and distance designation data from an object distance designation operating section (113), reads out moving position adjustment data for the respective movable lens groups (G2, G4) from third and fourth tables stored in the ROM (116), and then transmits predetermined lens drive signals to the movable lens groups (G2 and G4) according to these data.
REFERENCES:
patent: 4161756 (1979-07-01), Thomas
Fuji Photo Optical Co., Ltd.
Perkey W. B.
Snider Ronald R.
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