Audio visual system having recorded moving light pointer and met

Details Audio visual system having recorded moving light pointer and met Audio visual system having recorded moving light pointer and met

1978-01-30

1979-03-27

Stephan, Steven L.

Optics: image projectors

Pointer

G03B 2100

Patent

active

041463145

ABSTRACT:
An automatic pointer for audio-visual systems superimposes a bright highlighting spot on a sequence of visual images. The spot is continuously movable over each image in coordination with the audio program. Movement of the spot is programmed initially through a transducer that translates the position of a thumb into electrical signals. One pointer movement mechanism for a front screen projector employs a pair of mutually perpendicular frames that support an apertured mask which defines the pointer image. Stepping motors acting through a gear train move the frames to position the pointer spot. A preferred pointer movement mechanism for a rear screen viewer employs a twisting mirror.
In a preferred form for front screen slide projection, the pointer mechanism mounts a standard slide projector with the slide projection lens vertically spaced from the pointer projection lens. A mechanical linkage to the focus control of the pointer projector automatically corrects for parallax problems due to this separation between the two projection lenses. Alternatively, the pointer projector can execute a programmed pattern that outlines a centered visual image and the slide projector itself can be adjusted so that its actual projected image coincides with the outline.

REFERENCES:
patent: 1119597 (1914-12-01), Henry
patent: 2848922 (1958-08-01), Field
patent: 3220305 (1965-11-01), Van Gelder et al.
patent: 3552037 (1971-01-01), Stern
patent: 3804503 (1974-04-01), Sissona
patent: 3832050 (1974-08-01), Johannsen
patent: 4060318 (1977-11-01), Hansford

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