Nippon Electric Glass Co., Ltd.

Tokyo Shibaura Denki Kabushiki Kaisha

Hajime Makio

Yoshiharu Miwa

Takashi Kuze

Masaya Kyono

Nobutaka Daiku

Shigeyoshi Ito

Yukio Baba

Upper end edges () of positioning reference portions () to be formed on outer walls of a funnel () for cathode ray tube are formed at distances (downwardly) toward a narrow open end () of the funnel from a maximum profile line () formed in the vicinity of a wide open end () by mold matching of forming mold at the time of press molding, thereby suppressing molding defects such as deficiency and wrinkle resulting from that glass is not completely filled, which are likely to occur in reference surfaces () of the positioning reference portions, and eliminating occurrences of small cracks caused by concentration of heat stress, which are likely to occur in the upper end edges () of the reference portions, to improve the productivity of the funnel.

CRT funnel with positioning reference portions

A glass panel for a cathode ray tube comprises a substantially rectangular face portion on which images are displayed and a skirt portion continuous to the face portion through a blend R portion. An effective screen size of the face portion in a diagonal direction is 500 mm or more, an average radius of curvature of an outer surface of the face portion is 10000 mm or more in all radial directions from a face center portion, and a difference in height between the face center portion and an edge portion of the effective screen in the diagonal direction on an inner surface of the face portion is in a range from 9 mm to 17 mm.

Glass panel for cathode ray tube

An anode button for a cathode ray tube comprises an outer cup having a peripheral wall made so thin as to be well sealed to a glass bulb and an inner cup disposed in the outer cup for minimizing X-ray leak. A space is provided between the outer and inner cups so that the seal between the outer cup and the glass bulb is not damaged.

Anode button for a cathode ray tube

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Hikone, Japan

Hajime Makio