Camera with a variable focus lens device

Details Camera with a variable focus lens device Camera with a variable focus lens device

1994-03-30

1995-12-19

Hayes, Monroe H.

G03B 118

Patent

active

054772966

ABSTRACT:
A camera with a variable focus lens device, in which a lens position detecting device detects the focal length of the photographing lens from the amount of movement of a movable member that is capable of being rectilinearly advanced and retracted along the optical axis of the photographing lens, in order to provide an autofocusing function to accurately focus upon an object. Thus, the focal length can be detected in a simplified manner, and the influence of errors during assembly of the components of a photographing lens driving system can be minimized. A flare preventing mask effectively prevents flare occurrence in correspondence to variations in the position of the photographing lens. The lens retaining structure simplifies the assembly of the front lens group into a movable lens mount, and reduces the size and weight of the camera. A position sensor is coupled to the movable member which moves while maintaining a predetermined relation with the movement of the photographing lens, and the position of the photographing lens is detected from the amount of movement of the movable member. A key member prevents rotation of the movable lens mount and so allows the movable lens mount to be advanced or retracted a lesser distance than the movable lens mount. The flare preventing mask is mounted on the key member. A rear focusing type autofocusing mechanism is provided by inserting a holder retaining the front lens group into the movable lens mount from the front end of the lens mount.

REFERENCES:
patent: 5035493 (1991-07-01), Tanaka
patent: 5041855 (1991-08-01), Takezawa et al.

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