Zoom lens barrel and adjustment method of the flange back focal

Details Zoom lens barrel and adjustment method of the flange back focal Zoom lens barrel and adjustment method of the flange back focal

1995-11-17

1997-10-21

Epps, George Y.

Optical: systems and elements

Lens

With variable magnification

359699, 359700, G02B 1514

Patent

active

056802552

ABSTRACT:
A zoom lens barrel and a method of adjusting the flange back focal distance of the zoom lens barrel is disclosed. The zoom lens barrel includes mounting members for mounting the zoom lens barrel on a camera body; a zoom ring that rotates for zooming relative to the mounting members; an adjustment member that may rotate with or relative to the zoom ring; and a cam ring. The cam ring is screwed to the adjustment member and moves in the optical axis direction due to the rotation of the adjustment member when the adjustment member rotates relative to the zoom ring, and when the adjustment member and the zoom ring both rotate, the zoom ring and the adjustment member rotate together. Lens units move in the optical axis direction due to the rotation of the cam ring.

REFERENCES:
patent: 4387968 (1983-06-01), Sekiguchi
patent: 5144493 (1992-09-01), Nomura
patent: 5225939 (1993-07-01), Iizuka

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