Variable magnification projection device

Details Variable magnification projection device Variable magnification projection device

1980-05-12

1982-05-18

Henry, Jon W.

G02B 714, G02B 1510

Patent

active

043301797

ABSTRACT:
A variable magnification projection device includes a principal lens displaceable along its optical path and at least a supplementary lens movable into and out of the optical path at a fixed conjugate distance from the principal lens as the latter is displaced. The supplementary lens is linearly movable along a sliding rail extending perpendicular to the optical path and is so coupled to a fixed frame of the device that as the principal lens is displaced along the path, it is automatically moved from a first position remote from the path to a second position in which its optical axis and that of the principal lens coincide.

REFERENCES:
patent: 2985070 (1961-05-01), Lane
patent: 3476478 (1969-11-01), Rees
patent: 3591256 (1971-07-01), Hoyer et al.
patent: 3600066 (1971-08-01), Delvecchio
patent: 3678819 (1972-07-01), Gruber
patent: 3853387 (1974-12-01), Demaine et al.
patent: 3882520 (1975-05-01), Kamp et al.

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