Fading mechanism for slide projectors with automatic focusing me

Details Fading mechanism for slide projectors with automatic focusing me Fading mechanism for slide projectors with automatic focusing me

1976-05-05

1977-06-14

Haroian, Harry N.

Optics: image projectors

Lamp control

Dissolve type

353101, G03B 310

Patent

active

040294072

ABSTRACT:
A picture slide projector having provision for automatic focusing (i.e., provision for automatically keeping the projection lens and the picture slide at a constant distance from each other notwithstanding a buckling displacement of the slide under the influence of heat) is provided with means for moving the projection lens axially relative to the picture slide, to an out-of-focus position to produce a fading or dissolving effect on the viewing screen, while the slide is being withdrawn from the slide holder or gate and replaced by another slide. At the same time, the automatic focusing mechanism is rendered inoperative. Preferably also at the same time, the projection lamp is dimmed. When the slide changing operation is completed, the automatic focusing mechanism is rendered operative, and it serves to bring the projection lens back axially to the sharp focus position, the projection lamp being simultaneously brightened.

REFERENCES:
patent: 3601482 (1971-08-01), Harvey
patent: 3861794 (1975-01-01), Sobotta

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