Optics: image projectors – Slide transfer mechanism – Gravity operated
Patent
1980-06-26
1981-09-29
Stephan, Steven L.
Optics: image projectors
Slide transfer mechanism
Gravity operated
40511, G09F 1130, G03B 2302
Patent
active
042919550
ABSTRACT:
A slide projector for projecting slides transferred into and out of registry with a projection aperture solely by the force of gravity. A rotary slide tray is vertically arranged with the slides in a radial orientation, and the rotary slide tray is arranged over a central hub portion having a vertically arranged projection passage formed therein. Upon rotating the rotary slide tray, slides are permitted to radially drop from the tray by the influence of gravity into the projection passage and will be caused to back-up in the passage, since they are falling entirely through the slot and resting upon slides already in the rotary slide tray in diametrically opposed locations. A specialized slide construction, formed as a double planar slide of two individual slides arranged having like horizontal edges arranged adjacent or a single slide with a recess formed in one horizontal edge is employed. A shutter controlled by a solenoid actuated by insertion of a properly oriented slide into a recess in a tray is provided to block the projection passage except when a properly oriented slide is aligned with the projection aperture. A modification of the projector utilizes an arcuate shaped slide path to guide slides from the lower end of a vertical slide passageway to an upper end of the passageway, the slides being projected during passage through the slide passageway. A pusher pushes slides from the passageway into the slide path in such manner that all of the slides are advanced through the slide path.
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patent: 3874788 (1975-04-01), Thorn et a.
patent: 4105317 (1978-08-01), Sobotta
patent: 4232953 (1980-11-01), Sabater
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