G - Physics – 03 – B
Patent
G - Physics
03
B
88/72
G03B 21/11 (2006.01)
Patent
CA 1123241
ABSTRACT OF THE DISCLOSURE An improved filmstrip-carrying cassette, the film- strip carrying thereon microimages arranged in rows and col- umns, and a viewer for illuminating, projecting, enlarging and reading on a display screen a selected one of the micro- images is provided, using a pair of transparent plates to engage a selected portion of the filmstrip on opposite sides to hold same in a precise focal plane for properly illuminating and projecting the selected microimage. The filmstrip has great width to accommodate multiple rows of microimages, and motor means operate to transport the filmstrip selectively in oppo- site directions to quickly locate the column in which the de- sired microimage is located. The cassette is carried by a viewer-mounted carriage that is manually reciprocable along a track, so as to traverse the column in seeking the desired microimage. The transparent plates are separated simultane- ously with the energizing of the motor means to permit unfet- tered movement of the filmstrip. In one form of construction, the transparent plates are carried by the cassette. In a pre- ferred form, the cassette carries one transparent plate, and the other plate is carried by the viewer's carriage; the motor means provides selectively fast or slow transport, and the trans- parent plates are caused to separate only during fast trans- port, to provide visual coordination for locating the selected microimage with the slow transport of the filmstrip. A modular construction for the light projecting portion of the viewer provides for simplicity of adjustment and servicing.
317678
Meredith & Finlayson
Northern Engraving Company
LandOfFree
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