Photocopying – Projection printing and copying cameras – With focusing or projection screen
Patent
1983-01-10
1985-02-05
Hix, L. T.
Photocopying
Projection printing and copying cameras
With focusing or projection screen
353 26A, G03B 2148, G03B 21134
Patent
active
044975724
ABSTRACT:
An x-ray microfilm reader includes a microcomputer control system for controlling film loading, unloading and searching for a particular frame, as well as controlling exposure times for full-size reproductions ("blow backs") of the x-ray images. The x-ray microfilm is contained in a cartridge which is inserted into a cartridge station of the microfilm reader. When the user depresses an INDEX key, the control system automatically causes the microfilm to be withdrawn from the cartridge and wound onto a takeup reel until the first frame is aligned at a film gate. By entering a numerical value through a keyboard and then actuating a SEARCH switch, the user causes the control system to automatically drive the film until the selected frame is aligned at the film gate. The control system controls operating speeds of the drive motor as a function of the distance between the current frame and the desired frame, so that the microfilm is stopped at the proper frame without undershoot or overshoot. Once the desired frame has been located, the user can insert an x-ray plate or cartridge in a track behind the projection screen. A file monitor switch indicates the presence of the x-ray plate in the track, and the control system disables the film drive and turns off the projection lamp. The user then enters, through numerical keys, a desired exposure time and actuates an EXPOSE switch, which causes the photosensitive film in the x-ray cassette to be exposed to the image from the frame.
REFERENCES:
patent: 3290987 (1966-12-01), James et al.
patent: 3684366 (1972-08-01), Hollwedel, Jr.
patent: 3802771 (1974-04-01), Michelson
patent: 4339182 (1982-07-01), Ueda et al.
Hix L. T,.
Med-Tech Micrographics, Inc.
Rutledge Della J.
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