Job Description:

• 1) Tends equipment that forms and prepares aperture masks and display screens for oscilloscope and television picture tubes: Feeds specified sections of sensitized steel between plates in photographic printing chase to flatten sheet to specification.

• 2) Sets timer for specified exposure and turns on heliarc lamp to imprint pattern of aperture mask from photographic plate onto steel.

• 3) Verifies alignment of plates, using microscope.

• 4) Tends furnace that blackens aperture masks and rings.

• 5) Feeds mask through series of rollers that flatten mask.

• 6) Positions mask on bed of forming press and lowers die to form mask.

• 7) Tends processing equipment to clean, dry, and coat phosphor on inside face of display screen.

• 8) Positions aperture mask and screen on fixture over time-cycled light source to print color-emitting dots on phosphor coating.

• 9) Starts cycle to expose coating to light through mask aperture.

• 10) Marks mating screen and aperture mask with matching numbers for future assembly.

• 11) Fastens screen in holder on conveyor that carries screen through equipment that develops exposed phosphor, removes unexposed phosphor, and dries screen.

• 12) May be designated according to process as Aperture-Mask Etcher; Mask Former; Screener.