System and method for controlling the exposure of color picture

Details System and method for controlling the exposure of color picture System and method for controlling the exposure of color picture

1981-05-28

1984-03-13

Nelms, David C.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250205, 430 24, G03B 4100

Patent

active

044363940

ABSTRACT:
The light intensity-exposure time product of a lighthouse used in the manufacture of phosphor screens for color picture tubes is held constant despite changes in the shadow mask light transmission characteristic and power supply variations. The power provided to the exposing lamp is monitored and converted to a square wave output having a frequency which varies with the power. The frequency variations change the exposure time inversely with the frequency changes to maintain the light intensity-exposure time product constant.

REFERENCES:
patent: Re21907 (1941-09-01), Balsley
patent: 3636836 (1972-01-01), Maddox et al.
patent: 3737617 (1973-06-01), Llop et al.
patent: 3949226 (1976-06-01), Dugan
patent: 4009387 (1977-02-01), Nuver
patent: 4053906 (1977-10-01), Schultz
patent: 4059834 (1977-11-01), Hosokoshi et al.
patent: 4222642 (1980-09-01), VanNes
patent: 4226513 (1980-10-01), Shimoma et al.
patent: 4256390 (1981-03-01), Fisher et al.

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