Optics: motion pictures – With sound accompaniment – Sound stages – methods and accessories
Patent
1994-09-13
1995-10-10
Gellner, Michael L.
Optics: motion pictures
With sound accompaniment
Sound stages, methods and accessories
352 90, 40546, 362 31, 362 98, 362155, 362253, 340332, G03B 3100, G03B 2132
Patent
active
054575079
ABSTRACT:
The present invention relates to a back lighted clap board or slate used for the identification of rolls, takes, and scenes and like information in the making of films that is back-lit with an electroluminescent panel. The electroluminescent panel is activated by the movement of the clap board arms with respect to each other such that, when the arms open, the electroluminescent panel is illuminated. A timing circuit determines the length of time the electroluminescent panel will be lit. Either a mechanically actuated switch or a Hall effect switch may be used to control the illumination of the electroluminescent panel. In addition, a photodiode may be used to detect light intensity and activate the circuit only when the light falls below a predetermined intensity.
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Gellner Michael L.
Lee Eddie C.
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