System and method for determining the light transmission...

Details System and method for determining the light transmission... System and method for determining the light transmission...

H - Electricity

01

J

316/3

H01J 9/42 (2006.01) H01J 9/00 (2006.01) H01J 9/227 (2006.01)

Patent

CA 1196050

ABSTRACT OF THE DISCLOSURE A system for determining the exposure time required for a lighthouse to expose the screen of a picture tube panel in accordance with the light transmission characteristic of the shadow mask includes means for providing the actual light transmission characteristic of the shadow mask. The minimum and maximum acceptable transmission values are subtracted to form a transmission range. The actual transmission characteristic and the minimum transmission value are combined to provide a transmission difference signal. The transmission difference signal and the transmission range are converted into a ratio which is used to determine a transmission percentage. The percentage is combined with a maximum exposure time to establish the exposure time.

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