Zoom lens assembly

Details Zoom lens assembly Zoom lens assembly

1988-05-27

1990-05-15

Arnold, Bruce Y.

G02B 1500

Patent

active

049252828

ABSTRACT:
A zoom lens assembly comprises a photo-taking optical system having a focusing portion, a zooming portion, and an optic axis, a manual operator movable in the direction of the optic axis for zooming and rotatable about the optic axis for focusing, an electrically rotated drive shaft, a member for moving the zooming portion of the photo-taking optical system for zooming in response to the movement of the manual operator in the direction of the optic axis, an intermediate member rotatable in response to the rotation of the manual operator to move the focusing portion of the photo-taking optical system for focusing, and movable in the direction of the optic axis with the manual operator, a transmission system for coupling the intermediate member to the drive member for movement in the direction of the optic axis to thereby transmit the rotation of the drive member to the intermediate member irrespective of the movement of the intermediate member in the direction of the optic axis, and a change-over device operable to connect and disconnect the rotation of the manual operator and the intermediate member.

REFERENCES:
patent: 4275952 (1981-06-01), Uesugi
patent: 4621906 (1986-11-01), Hashimoto et al.
patent: 4681406 (1987-07-01), Naito et al.
patent: 4729644 (1988-03-01), Ueyama
patent: 4806000 (1989-02-01), Shiokama et al.

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