Deflection yoke

Details Deflection yoke Deflection yoke

2002-09-25

2004-11-23

Patel, Ashok (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Beam deflecting means

C335S213000

Reexamination Certificate

active

06822382

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a deflection yoke, which is constituted to fix vertical float and horizontal float between a coil separator and a front cover which are assembled together in the deflection yoke, to improve the structure of the connection between the coil separator and the front cover.
2. Description of the Related Art
In general, the deflection yoke used for a television receiver or a cathode ray tube of a monitor is formed in various types such as a Saddle-Troidal Type, a Saddle-Saddle Type, and has a part to accurately deflect an electron beam scanned from an electron gun to a fluorescent film applied on the screen of the cathode ray tube.
As illustrated in
FIG. 1
, a general deflection yoke
101
is positioned in a neck portion of a cathode ray tube
102
and is divided into two main types, the Saddle-Saddle Type and the Saddle-Troidal Type according to the winding structure of coils.
The deflection yoke deflects an electron beam launched from a RGB electron gun
103
positioned in the neck portion of the cathode ray tube
102
to the left/right and upper/lower directions and thus has the part to impact to the accurate position on the fluorescent surface of the cathode ray tube.
The structure of connecting a coil separator and a front cover according to the present invention is applicable to any one of the Saddle-Saddle Type deflection yoke and the Saddle-Troidal Type deflection yoke, and the Saddle-Saddle Type is described below.
However, a person having an ordinary knowledge in this art can know that the structure of an inner arm in the present invention and the related arts can be also applicable to the aforementioned Saddle-Troidal Type deflection yoke.
The general deflection yoke
101
is constituted as follows. An approximately conical coil separator
113
has a front cover
111
to be connected toward the cathode ray tube and a rear cover
112
being formed at the opposite side, and a horizontal deflection coil
113
a
is formed in the upper/lower sides inside of the peripheral surface of the screen portion of the coil separator
113
and a vertical deflection coil
113
b
is formed in the left/right sides of the peripheral surface.
An approximately cylinder-shaped ferrite core
114
is provided on the peripheral surface of the screen portion of the coil separator
113
to strengthen a magnetic field of the vertical deflection coil
113
b.
Further, coma free coils
115
to correct a coma occurred by the vertical deflection coil
113
b
are additionally formed at about the peripheral surface of a neck portion of the coil separator
113
.
The deflection yoke as constituted above is mounted to the neck portion of the cathode ray tube. If an electric current is applied to the horizontal and vertical deflection coils, the magnetic field is generated and the electron beam in red (R), green (G) and blue (B) radiated from an electron gun of the cathode ray tube is deflected, thereby determining a scanning position on the screen.
In the general deflection yoke, the coil separate
113
and the front cover
111
are integrated in a solid body, however, these are manufactured in the separate forms and used in the state of connecting two if necessary. In connecting a coil separator with a front cover manufactured in the separate forms and using the connected ones, for said connection, the present invention is to improve the structure of a connection projection of the coil separator and a connection hook of the front cover. Below, the structure of connecting the connection projection of the general coil separator and the connection hook of the front cover.
FIG. 2
is an exploded perspective view of a coil separator and a front cover of a deflection yoke according to the related arts. As illustrated in
FIG. 2
, the outside surface of the coil separator
113
is connected with each of plural connection hooks
111
c
,
111
d
formed on the front/rear and left/right sides of the front cover
111
.
FIG. 3
is a plan view illustrating such a connection state and
FIG. 4
is an exploded perspective view to illustrate the connection by the connection hook.
The coil separator and front cover connected by the connection structure can prevent only the vertical float, that is, the upper and lower direction (z direction) float of the coil separator but cannot prevent the horizontal float, that is, the left and right directions (x,y directions) float and thus have the problem of causing a quality degradation.
To solve the above-indicated problem, although there has been a study of the method of adding an additional assembly structure for the left and right direction constraint, there are the problems that the structure is complicate and the assembling productivity is degraded.
Therefore, it is keenly required to provide the structure of the coil separator and the front cover which have an excellent assembling productivity and offer the positive structure to prevent the float in the three dimensional space.
SUMMARY OF THE INVENTION
To solve the above-indicated problems, it is, therefore, an object of the present invention is to provide a deflection yoke to improve the connection structure of a coil separator and a front cover in a deflection yoke.
To achieve the above object, there is provided a deflection yoke comprising a coil separator having a flange surface being provided means for preventing a float; a ferrite core being installed to form a magnetic field on the peripheral surface of the coil separator; a vertical deflection coil being positioned with the ferrite core on the peripheral surface of the coil separator; a horizontal deflection coil being provided inside the peripheral of the coil separator; a front cover to be connected with the means for preventing the float of the flange surface of the coil separator being provided means for preventing the float formed on the front/rear and left/right sides so that the float on the connection surface can be prevented; and a rear cover being positioned on the upper portion of the coil separator.
Specifically, according to a preferred embodiment of the present invention, the means for preventing the float on the flange surface of the coil separator has eight connection projections.
In addition, the means for preventing the float of the front cover has eight connection hooks.


REFERENCES:
patent: 4712080 (1987-12-01), Katou
patent: 5804913 (1998-09-01), Grubben et al.
patent: 6404118 (2002-06-01), Park
patent: 6472809 (2002-10-01), Motomiya et al.
patent: 6559587 (2003-05-01), Inoue et al.

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