Zoom lens barrel for variable magnification type copying machine

Details Zoom lens barrel for variable magnification type copying machine Zoom lens barrel for variable magnification type copying machine

1984-09-26

1985-11-26

Corbin, John K.

Photocopying

Contact printing

Light boxes

355 55, G02B 711, G03B 2710

Patent

active

045551650

ABSTRACT:
A zoom lens barrel for a variable magnification type copying machine in which the lenses are readily mounted and adjusted and the optimum angular positions thereof employed. Two movable lenses are fixedly held by respective movable lens frames, the latter being inserted into an axial hole formed in a single movable lens barrel which is moved in the axial direction as the magnification setting of these zoom lenses vary. At least one of the movable lens frames is fixedly secured to the movable lens barrel, while the other movable lens frame is supported in the movable lens barrel in such as a manner as to move in the axial direction as the magnification changes. The one movable lens frame includes a first mechanism for adjusting the angular position of the one movable lens frame with respect to the movable lens barrel without moving the movable lens frame in the axial direction, and a second mechanism for adjusting the position of the one movable lens frame in the axial direction thereof.

REFERENCES:
patent: 2529894 (1950-11-01), Altman et al.
patent: 3765748 (1973-10-01), Mito

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