Optical transformation drawing apparatus

Details Optical transformation drawing apparatus Optical transformation drawing apparatus

1975-08-25

1976-04-13

Bell, Jr., Houston S.

Optics: image projectors

Simultaneous projection and manual delineation

353 77, 353 79, 353119, 248 11, G03B 2110, G03B 2128

Patent

active

039500853

ABSTRACT:
In an optical transformation drawing apparatus in which an image is projected by a projector on to a rear face of a projection screen so that a draftsman can trace on the front face of the screen the image transmitted through the screen, both the projection screen and a projector support frame supporting the projector are mounted on a fixed frame to pivot about an axis with the projector support frame and the projector thereon acting as a counterweight for the screen and with the projector support frame arranged parallel to the pivot axis, a mirror being provided to deflect the image from the projector on to the rear face of the screen.

REFERENCES:
patent: 405758 (1889-06-01), Bement
patent: 1306861 (1919-06-01), Sparkes
patent: 1840920 (1932-01-01), Spaulding
patent: 2254368 (1941-09-01), Holbrook
patent: 2474055 (1949-06-01), Lacey
patent: 3627241 (1971-12-01), Santirocco
patent: 3880508 (1975-04-01), Hughes

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