Focus adjusting device of a camera
US4456356A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 16, 1982 |
| Grant date | Jun 26, 1984 |
| Priority date | — |
| Expiry date | Jul 16, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A focus adjusting device of a camera has moving means for moving a phototaking lens in the direction of the optical axis thereof, a motor producing a revolution output, a manually operated ring provided on the outer periphery of a lens barrel and rotatable circumferentially of the lens barrel, mode selecting means for selecting one of a manual mode in which the phototaking lens is driven by the manually operated ring and an automatic mode in which the phototaking lens is driven by the motor, and clutch means for coupling the moving means and the manually operated ring together when the manual mode has been selected by the mode selecting means and for cutting off the coupling between the moving means and the manually operated ring when the automatic mode has been selected by the mode selecting means. The device further has limit means for blocking movement of the moving means when the phototaking lens has come to an infinity in-focus position and when the phototaking lens has come to a very short distance in-focus position. The clutch means produces slip between the manually operated ring and the moving means when the manually operated ring is rotated by a great torque, thereby perm…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.