Method of arranging a conductive wire pattern of a film-type sad

Details Method of arranging a conductive wire pattern of a film-type sad Method of arranging a conductive wire pattern of a film-type sad

1998-06-24

2000-05-23

Patel, Vip

Electric lamp and discharge devices

Cathode ray tube

Beam deflecting means

313441, 335210, 335213, H01J 2970

Patent

active

060669136

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention generally relates to a method of arranging a conductive wire pattern of a film-type saddle deflection member for a cathode ray tube and a film-type saddle deflection member having the conductive wire pattern arranged by the method. More particularly, the present invention relates to a method of arranging a conductive wire pattern of a film-type saddle deflection member for a cathode ray tube which properly arranges a plurality of conductive wires in each film such that an optimum magnetic field can be obtained, and relates to a film-type saddle deflection member having the conductive wire pattern arranged by the method. In the present invention, each pair of film-type deflection members is formed, in stead of winding coils, by stacking a plurality of films such as flexible printed circuit boards having at least one conductive wire arranged in a predetermined pattern one on another, or by stacking conductive wire layers having a plurality of conductive wires arranged in a predetermined pattern with interposing an insulation layer between upper and lower portions of the conductive wire layers, in such a manner that the film-type deflection members can produce a predetermined magnetic field pattern.


BACKGROUND OF THE INVENTION

FIG. 1 shows a color-picture cathode ray tube 10 including a panel 12 having a panel surface 18, a fluorescence screen 20 formed on the back of the panel surface 18, a neck 14 containing an electron gun 11 which produces electron beams 19a and 19b and emits them towards the fluorescence screen 20, a funnel 13 for connecting the neck 14 to the panel 12, and a deflection yoke assembly 17 mounted on a connection portion at which the neck 14 is connected to the funnel 13.
The funnel 13 has an internal conductive layer (not shown) contacting a positive electrode terminal 15. A shadow mask 16, which has a plurality of apertures or slots 16a arranged in a predetermined pattern, is spaced at a predetermined distance apart from the screen 20 and is detachably installed in the panel 12.
The deflection yoke assembly 17 generally has a pair of horizontal deflection members and a pair of vertical deflections members. As a current is applied thereto, the horizontal deflection members produce a horizontal deflection magnetic-field for horizontally deflecting the electron beams 19a and 19b. In addition, the vertical deflection members also produce a vertical deflection magnetic-field for vertically deflecting the electron beams 19a and 19b as a current is applied to the vertical deflection members.
The deflection magnetic-fields is preferably varied by a proper means in such a manner that the electron beams 19a and 19b can be scanned over the whole face of the fluorescence screen 20, thereby providing two-dimensional images having an optimum deflection sensitivity on the cathode ray tube 12. In addition, such deflection of the magnetic field permits the horizontal deflection member to produce a pincushion magnetic field, and permits the vertical deflection member to produce a barrel magnetic field so that the electron beams of an in-line type electron gun are easily converged.
FIG. 2 is a sectional view taken along line 2--2 of FIG. 1 for illustrating a pair of film-type saddle horizontal deflection members LF and RF and a pair of film-type toroidal vertical deflection members UF and LR. The saddle horizontal deflection members LF and RF are mounted on the yoke with a supporting member 135a being interposed between the saddle horizontal deflection members LF and RF and an inner surface of a bobbin 135, and the toroidal vertical deflection members UF and LR are wound around a core 36 at the outside of the bobbin 135.
FIG. 3 shows European patent application No. 85201158.4 (Publication No. E.P. 0 1169 613 A1) filed by Philips Electronic and Associated Ind. Ltd., at al., which discloses a saddle horizontal deflection member 30 mounted as mentioned above. As shown in FIG. 3, the saddle horizontal deflection member 30 for the cathode ray tube comprises a defl

REFERENCES:
patent: 3792305 (1974-02-01), Lister
patent: 4126842 (1978-11-01), Barouh et al.
patent: 4556857 (1985-12-01), Logan
patent: 5847503 (1998-12-01), Roussel et al.

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