Method for manufacturing a glass panel for a cathode ray tube

摘要

The invention relates to a method for producing CRT screens in which, during the cooling of the CRT screen, the cooling rate of the fast cooling parts of the screen is reduced. The outside of the CRT screen (the side facing the viewer of the CRT) normally has a higher cooling rate than the inside of the CRT screen. Therefor, the invention provides means to reduce the cooling rate of the outside of the CRT screen by reflecting heat coming from the outside of the CRT screen back to the CRT screen and/or by providing extra heat to the outside of the CRT screen by a heater. The method of the invention is preferably used during the transport of the CRT screen from the press to the lehr (cooling oven). Advantages/Improvements The invention provides means for a symmetric cooling of the CRT screen (inside/outside the same cooling rate) which will reduce unwanted stresses in the CRT screen and will increase the dimensional accuracy of the product.