Optics: image projectors – Lamp control – Dissolve type
Patent
1975-08-18
1978-02-28
Haroian, Harry N.
Optics: image projectors
Lamp control
Dissolve type
353 94, G03B 2126
Patent
active
040763994
ABSTRACT:
A control system for the control of special functions in multiple projector systems is disclosed. The system can effect fading, blending and mixing at different speeds in forward and reverse projector directions. The system includes a freely programmable memory, such as a cross-bar distributor for storing program instructions. The program memory may be modified by changing the location of plug-in diodes at cross-over points between rows and columns of the cross-bar distributor. A selector is provided for extracting a portion of the programmed memory. The selector may include an automatic portion such as a stepping switch for changing the portion of the program selected. The selector provides binary coded signals representative of program instructions to a decoder. The decoder decodes the digital signals and provides control signals for effecting control of the light sources in each projector. The decoder includes a different charge-discharge circuit for each projector. The charge-discharge time constant of the control signal is changed to modify the rate of change of the actuation and deactuation of the projector. The decoder also includes means for changing the phase and amplitude of the control signal and means for supplying a slide changer pulse signal.
REFERENCES:
patent: 3015809 (1962-01-01), Myers
patent: 3027548 (1962-03-01), Vaughan
patent: 3282155 (1966-11-01), Cleary
patent: 3503058 (1970-03-01), Ault
patent: 3622236 (1971-11-01), Novy
patent: 3844646 (1974-10-01), Oury
patent: 3907419 (1975-09-01), Moran
patent: 3909124 (1975-09-01), Schmidt
Braun Aktiengesellschaft
Haroian Harry N.
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