Shadow mask having vertical pitch about 8/(2n-1) times horizonta

Details Shadow mask having vertical pitch about 8/(2n-1) times horizonta Shadow mask having vertical pitch about 8/(2n-1) times horizonta

1978-10-19

1980-01-29

Segal, Robert

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313403, 313470, H01J 2906, H01J 2932

Patent

active

041863267

ABSTRACT:
A color picture tube, wherein a set of three electron beams emitted from respective three electron-emitting members of an electron gun, or from respective three electron guns, is projected onto a screen, and sets of each three luminous strips on this screen are selectively energized to emit luminous color lights, characterized in that the numeral ratios between said luminous strips by pieces and said slots of the shadow mask, respectively, are about 1:1 vertically and about 3:1 horizontally, and also that every strip as well as its set is complete insulated from adjacent strips and their sets by a light-absorbent film filling all the gaps inbetween.
With such construction, a color picture tube having excellent brightness and contrast characteristic, being free from disturbing vertical strips, has been obtained.

REFERENCES:
patent: 3146368 (1964-08-01), Fiore et al.
patent: 3247412 (1966-04-01), Barneveld et al.
patent: 3569760 (1971-03-01), Fargher
patent: 3633058 (1972-01-01), Kuono
patent: 3663854 (1972-05-01), Tsuneta et al.
patent: 3731129 (1973-05-01), Tsuneta et al.
patent: 3766419 (1973-10-01), Barbin
patent: 3900757 (1975-08-01), Kaplan
patent: 3979630 (1976-09-01), Ormer
Barbin & Hughes, "New Color Picture System for Portable TV Receivers," IEEE Transactions on Broadcast and Television Receivers, BTR-18, 1972; pp. 193-200.

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