Cathode ray tube apparatus

Details Cathode ray tube apparatus Cathode ray tube apparatus

1994-09-22

1996-09-03

Wieder, Kenneth A.

Electric lamp and discharge devices

Cathode ray tube

Screen

313463, 348805, H01J 2918

Patent

active

055526632

ABSTRACT:
The present invention enlarges the effective display area of a CRT for projecting while maintaining the strength of the panel necessary to allow for normal usage without breaking. The inside portion of the effective display area inside the rectangular display area is of a predetermined radius, and protrudes inward, extending in all directions. The four corners of the display area are outside of the circular boundary line comprised of the standard thickness Tf. Non-display areas H which are outside the boundary line are flat or protuberant, and have a thickness greater than the standard thickness Tf. Accordingly, with the present invention, the effective display area A2 can be made larger than previous effective display areas A1 in the prior art, which could not extend beyond a border that included the four corners, while maintaining overall the necessary strength.

REFERENCES:
patent: 2172775 (1939-09-01), Schmidt-ott et al.
patent: 4409515 (1983-10-01), Kloss
patent: 4904899 (1990-02-01), Nakata et al.
patent: 5353070 (1994-10-01), Mitani et al.

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