Zoom lens capable of effecting a macro operation

Details Zoom lens capable of effecting a macro operation Zoom lens capable of effecting a macro operation

1985-10-31

1988-01-19

Arnold, Bruce Y.

G02B 710, G02B 1500

Patent

active

047201827

ABSTRACT:
A zoom lens assembly comprises an optical system forming an optic axis and having at least one lens group moved along the optic axis for zooming and for focusing on an object to be photographed at a close-up distance less than a normal object distance. A barrel member is coupled to the lens group and is rotatable about the optic axis to move the lens group along the optic axis. An operating member is moved along the optic axis for a zooming operation and is rotated about the optic axis for a focusing operation. The operating member has a close-up operation area in which the operating member is rotated during focusing on an object at less than normal object distance. The barrel member is rotated in response to the zooming operation of the operating member. A connecting device is provided between the barrel member and the operating member and couples the barrel member to the operating member for rotation therewith when the operating member is rotated into the close-up operation area. In a specific embodiment, the optical system includes another lens group movable along the optic axis for zooming and for focusing at a normal object distance, but not movable along the optic axis during focusing at a close-up distance.

REFERENCES:
patent: 4114984 (1978-09-01), Muryoi
patent: 4247169 (1981-01-01), Uesugi
patent: 4322150 (1982-03-01), Kamata et al.
patent: 4421389 (1983-12-01), Muryoi
patent: 4448496 (1984-05-01), Isobe et al.
patent: 4506959 (1985-03-01), Hama

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