Cathode ray tube having magnetic shield with a bent portion

Details Cathode ray tube having magnetic shield with a bent portion Cathode ray tube having magnetic shield with a bent portion

2005-12-27

2005-12-27

Guharay, Karabi (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

C313S402000, C313S408000

Reexamination Certificate

active

06979943

ABSTRACT:
In a cathode ray tube including a panel provided with a phosphor screen, a funnel integrated with the panel, an electron gun disposed inside the funnel, a magnetic shield (1) for shielding an electron beam (5) emitted from the electron gun against an external magnetic field, and a frame (2) for holding the magnetic shield (1), the magnetic shield (1) includes, at a portion to be joined with the frame (2), a bent portion (20) bent toward a tube axis side, and a thickness T of the bent portion (20) at its edge on the tube axis side is 0.08 mm or less. By making the thickness T small, halation that is liable to occur in a cathode ray tube with a large deflection angle can be suppressed because electron beams reflected from an end face (11) and allowed to reach the screen without being shielded by the frame (2) are reduced.

REFERENCES:
patent: 5298832 (1994-03-01), Jeong et al.
patent: 6784607 (2004-08-01), Shimada et al.
patent: 2 310 079 (1997-08-01), None
patent: 53-66155 (1978-06-01), None
patent: 2-244542 (1990-09-01), None
patent: 55-71445 (1990-11-01), None
patent: 5-314919 (1993-11-01), None
patent: 11-120932 (1999-04-01), None

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