Optics: image projectors – Lamp control
Patent
1977-12-13
1978-12-19
Stephan, Steven L.
Optics: image projectors
Lamp control
353 92, 353116, G03B 2120, G03B 2304
Patent
active
041303539
ABSTRACT:
A slide projector with controls for the slide changing system and for the stop associated with the slide changing system where there are separately moving insertion and storage feeder arms for the slide changer, and at least two routes for inserting and removing the slides. Preferred motor driven cams (B",R",S",T") act as controls for the stop (8,11) and for slide changing and are operationally timed so that the closing process for the stop is initiated simultaneously or nearly simultaneously with the beginning of the removal of the projected slide (19a) from the slide stage plane and with the insertion of a new slide (19c). The process of stop opening begins immediately and without any pause after the complete closure of the stop which coincides with the terminated insertion of the new slide. Interlocking means (14-18) are provided in the slide stage (20) which keep the stop closed in a change process where there is no slide insertion and which means are overridden when the first new slide is introduced or when the previous one is reinserted, the override taking place through the slide itself.
REFERENCES:
patent: 2916965 (1959-12-01), Jungjohann
patent: 2978823 (1961-04-01), Klund
patent: 3067650 (1962-12-01), Pester
patent: 3910696 (1975-10-01), Mulch
Henkelmann Kurt
Schafer Wilhelm
Speier Rolf
Ernst Leitz Wetzlar GmbH
Stephan Steven L.
Wells Gilbert L.
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