Display apparatus for visually impaired persons

Details Display apparatus for visually impaired persons Display apparatus for visually impaired persons

1987-12-21

1990-01-16

Hix, L. T.

Music

Accessories

Teaching devices

353 74, G09B 1508

Patent

active

048935409

ABSTRACT:
An apparatus and a method for displaying visual information such as music to persons having visual deficiencies includes a housing having a rear projection screen and a mechanism for projecting images of the information. The mechanism can include a slide tray for storing transparencies of the information, a projection lamp and lens, and means for moving the slides from the storage tray to the projection lamp and back again. Controls are provided for varying the brightness of the projection lamp and the speed at which the slides are displayed in a predetermined sequence. Also, the size of the image on the viewing screen can be varied. In a manual mode of operation, a foot switch is available for sequencing the slides and both forward and reverse directions of display are available.

REFERENCES:
patent: 2483570 (1949-10-01), Bergey
patent: 3577824 (1971-05-01), Lavan
patent: 3887275 (1975-06-01), Heist
patent: 3991648 (1976-11-01), Karpowicz
patent: 4097135 (1978-06-01), Castor
patent: 4331062 (1982-05-01), Rogers

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