Photography – Having variable focal length of camera objective – Lens moves in or out of light path
Patent
1999-02-01
2000-07-04
Adams, Russell
Photography
Having variable focal length of camera objective
Lens moves in or out of light path
396 82, 396 85, G03B 1700
Patent
active
060850418
ABSTRACT:
An autofocus system and photographic lens to convert a residual defocus amount which is corrected on the camera body side into an appropriate residual drive amount on the photographic lens side. The autofocus system includes, on the camera body side, a focus detection device to detect a defocus amount of a photographic lens, a lens movement information acquisition device to acquire lens movement information, a within-camera correction device to determine a residual defocus amount, correcting the lens movement after focus detection based on relational information representing a relationship between the defocus amount and the lens drive amount and movement information, and an information transmission device to transmit the residual defocus amount to the lens side. The autofocus system also includes, on the lens side, a within-lens conversion device to convert the residual defocus amount into a residual drive amount using the coefficient information used by the within-camera correction device, and a lens drive device to drive the lens according to the residual drive amount.
REFERENCES:
patent: 4841325 (1989-06-01), Hoshino et al.
patent: 5231441 (1993-07-01), Hata
patent: 5687403 (1997-11-01), Ohtake
patent: 5765051 (1998-06-01), Watanabe
Adams Russell
Nikon Corporation
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