Method for manufacturing glass panel for a cathode ray tube

Details Method for manufacturing glass panel for a cathode ray tube Method for manufacturing glass panel for a cathode ray tube

2005-04-26

2005-04-26

Williams, Joseph (Department: 2879)

Electric lamp or space discharge component or device manufacturi

Process

Combined, e.g., with shaping of lamp or device envelope

C065S069000

Reexamination Certificate

active

06884137

ABSTRACT:
A method for producing CRT screens includes the step of reducing the cooling rate of part of a press-formed glass screen during the cooling stage. The outside portion of the screen, i.e., the side normally facing a viewer, normally has a higher cooling rate than the inside portion of the screen, which leads to unwanted stresses in the finished product. The cooling rate of the outside portion of the screen is reduced by reflecting the heat radiating from the outside portion during the cooling process, and/or providing extra heat to the outside portion from a heater. The reduction in the cooling rate is preferably done during the transport of the glass screen from the press to the cooling oven. The method provides for systematic cooling of the inside and outside portions of the glass screen at nearly the same cooling rate.

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