Means for adjusting the focal length of a lens in relation to it

Details Means for adjusting the focal length of a lens in relation to it Means for adjusting the focal length of a lens in relation to it

1987-12-16

1989-04-18

Corbin, John K.

Photocopying

Contact printing

Light boxes

35419511, 355 56, G02B 702

Patent

active

048221376

ABSTRACT:
A copying machine provided with an optical system having a variable imaging ratio and a fixed distance between the image plane and the object plane and a lens whose focal length can be adjusted to the selected imaging ratio by rotation of a toothed ring coupled to the lens. Displacement of the lens with respect to the object plane and the image plane, in order to change the imaging ratio, is converted into a rotation of the toothed ring on the lens by means of a system of cooperating gearwheels. One of these gearwheels has at least one toothed ring segment which is pivotable about an axis; situated almost at the circumference of the gearwheel and extending axially of said gearwheel. The toothed ring segment can be caused to pivot about the axis and be fixed in any position.

REFERENCES:
patent: 2464559 (1949-03-01), Davenport et al.
patent: 4135798 (1979-01-01), Slavitter
patent: 4448517 (1984-05-01), Hayashi
patent: 4641957 (1987-02-01), Takeda et al.

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