Glass trichter for cathode ray tube and manufacturing method thereof

Abstract

To discriminate between a partially chemically strengthened glass funnel and a non-strengthened glass funnel visually. At least the outer surface of a region 6 where maximum tensile vacuum stress occurs and if necessary, a region 7 where maximum thermal stress occurs in a body part 3 of the glass funnel 1 is chemically strengthened using paste containing potassium nitrate and silver nitrate by an electric field assist method to form a compressive stress layer and simultaneously silver ion is implanted to the glass in the chemically strengthened region to color by ion exchange.

Description

Technical field [0001] The present invention relates to a glass funnel for cathode ray tubes in which a partially chemically strengthened area is colored by ion exchange and a method for manufacturing the same. Background technique [0002] In recent years, many image display devices other than cathode ray tubes have been put into practical use. From a comparison between cathode ray tubes and these image display devices, as image display devices become larger, length and weight are disadvantages of the display device. is getting people's attention. Therefore, there is a strong demand for length reduction and weight reduction. However, if the length of the traditional cathode ray tube is shortened, the structural asymmetry of the cathode ray tube will also increase, resulting in the problem that the large tensile vacuum stress formed on the glass funnel far exceeds the damage strength of the glass. At the same time, due to the above-mentioned asymmetry and enlargement of th...

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Problems solved by technology

However, when using conventional techniques to chemically strengthen and color general glass products similar to the aforementioned plate glass, because the strengthening process and the coloring process are to be carried out separately, equipment and work space are required for each process. The process requires time and personnel, so there is a problem that the manufacturing cost increases.

[0046] Although the method of immersing in the aforementioned inorganic salt bath containing potassium ions and silver ions can be completed in one process, the silver content of the mixed salt bath with silver ions and potassium ions as main components has a subtle influence. If the silver content is low, the strengthening is sufficient, but the coloring is very little; if the silver content is high, the coloring becomes bright, but the strengthening is insufficient, and a satisfactory product cannot be obtained.

[0047] Also, a method of strengthening the chemically strengthened part of the glass funnel, which has a completely different composition from ordinary soda-lime glass, and at the same time coloring it by ion exchange has not yet been known

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