Electric heating – Metal heating – By arc
Patent
1987-11-25
1989-02-07
Paschall, M. H.
Electric heating
Metal heating
By arc
21912171, 21912161, 350 16, B23K 2600
Patent
active
048033375
ABSTRACT:
A method for the preparation of an illuminance-correcting light transmitting filter employed in an exposure device adapted for the preparation of the phosphor screen of the color cathode ray tube. The laser light modulated with a light modulator is radiated to the surface of the filter base plate on which a thin layer of the recording material is previously formed. A pattern of through-holes of variable size or density is formed as the thin layer is vaporized so that the light transmitting filter may be prepared with high accuracy and in a shorter time. The laser light is modified with the light modulator, and the filter base plate is securely mounted to a movable stage, the movement of which in the X- and Y- directions is controlled under the commands of a computer unit.
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Ishikawa Reiji
Kimura Tomohiro
Paschall M. H.
Sony Corporation
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