Over-head projector with partial projection device

Details Over-head projector with partial projection device Over-head projector with partial projection device

1980-10-07

1982-10-12

Stephan, Steven L.

Optics: image projectors

Transparent plate

Plate part of film gate

353 96, 353101, 353DIG3, 353DIG5, 353DIG6, G03B 148, G03B 2114

Patent

active

043536271

ABSTRACT:
An over head projector has a standard projection lens for projecting the whole view of an original image and a partial projection lens for projecting a part of the original image in enlarged scale. One of the projection lenses is selectively brought to a projection position for projecting the original image onto a projection screen. A stage for supporting the original image is vertically movable and is moved up and down when the projection lens is changed. The selection of the projection lens and the vertical movement of the stage are associated with each other so that the original image is always at a proper position with respect to the focal length of the selected projection lens.

REFERENCES:
patent: 2669156 (1954-02-01), Fitzgerald

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