Lighthouse having a main filter and a supplemental filter

Details Lighthouse having a main filter and a supplemental filter Lighthouse having a main filter and a supplemental filter

1975-10-23

1977-05-03

O'Connor, Edna M.

G03B 2120

Patent

active

040218201

ABSTRACT:
An exposure lighthouse for use in printing screen structures for cathode-ray tubes comprising a lens assembly including a diffracting optical element, a main intensity-correction filter and a supplemental intensity-correction filter in series with the main filter. Both of the filters comprise preformed carbon particles in a light - transmitting binder.

REFERENCES:
patent: 3420150 (1969-01-01), Kaplan
patent: 3569761 (1971-03-01), Lange
patent: 3592112 (1971-07-01), Frey
patent: 3676129 (1972-07-01), Ragland, Jr.
patent: 3788848 (1974-01-01), Morrell

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