Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Electron or ion beam deflecting type
Reexamination Certificate
2000-09-21
2002-04-16
Barrera, Ramon M. (Department: 2832)
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Electron or ion beam deflecting type
C211S201000
Reexamination Certificate
active
06373359
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention:
The present invention relates to a deflection yoke apparatus, which is improved in a construction of a container section for containing a component part for compensating a magnetic field characteristic such as a piece of magnet utilized for compensating a magnetic field characteristic such as misconvergence, for example.
2. Description of the Related Art:
FIG. 9
is a perspective view of the deflection yoke apparatus as one example of the prior art.
In
FIG. 9
, the deflection yoke apparatus is formed a funnel having a lager diameter section at the bottom end and a smaller diameter section at the top end supported by the separator
1
, which is composed of a pair of semi-annular members. In addition thereto, the larger diameter section is toward a face of a cathode-ray tube and the smaller diameter section toward a neck of the cathode-ray tube.
A saddle shaped horizontal deflection coil, not shown, is mounted on the inner wall of the separator
1
. The separator
1
holds the horizontal deflection coil and the vertical deflection coil
3
with electrically insulating them each other. The core
4
composed of such a component as ferrite is mounted on the outer surface of the vertical deflection coil
3
. Generally, a circuit for compensating a deflection characteristic is necessary to such the deflection yoke apparatus mentioned above, so that the circuit board
5
composed of such the circuit is mounted on the side wall of the separator
1
.
In the neck side of the separator
1
, a plurality of flanges, hereinafter called a neck side flange
1
a
is provided. On the other hand, the flange, hereinafter called a face side flange
1
b
is provided in the face side of the separator
1
. On the neck side flange
1
a
, a pair of
4
pole compensating coils
7
, which are so called a
4
P coil, are inserted and fixed.
Further, on the outer circumference area of the face side flange
1
b
, there provided
4
container sections
8
,
2
each on the front side and back side of the face side flange
1
b
as shown in
FIG. 9
, which contain a component part for compensating a magnetic field characteristic such as a piece of magnet utilized for compensating a magnetic field characteristic. Such a board like magnet
9
, not shown in
FIG. 9
but shown in FIGS.
10
(
a
) through
11
(
c
), is contained in each container section
8
. These
4
container sections
8
or
4
magnets
9
are allocated so as to be symmetric with the horizontal and vertical axes of a screen.
The magnet
9
contained in the container section
8
is allocated in a vicinity of a tangent to the outer circumference area of the face side flange
1
b
, and compensates horizontal cross misconvergence and vertical cross misconvergence occurs at
4
corners of the screen by canceling or shifting a distribution of deflection magnetic field generated by the vertical deflection coil
3
locally. Usually, the magnet
9
is made from sintered ferrite or rubber-like resin dispersed and mixed with powdered ferrite.
FIG.
10
(
a
) is a perspective view of the container section on the face side flange shown in
FIG. 9
partly, showing no magnet mounted.
FIG.
10
(
b
) is a perspective view of the container section on the face side flange shown in
FIG. 9
partly, showing a magnet mounted.
FIGS.
11
(
a
) through
11
(
c
) are sectional views taken substantially along line a—a of FIG.
10
(
a
), showing a change of status while installing a magnet in the container section.
In FIGS.
10
(
a
) and
10
(
b
), the right side of the drawing is the upper side or the neck side of the deflection yoke apparatus shown in FIG.
9
and the left side of the drawing is the lower side or the face side of the deflection yoke apparatus shown in FIG.
9
. Further, in FIGS.
11
(
a
) through
11
(
c
), the right side of the drawing is the inner side of the separator
1
and the left side of the drawing is the outer side of the separator
1
. Furthermore, the line “H” is the horizontal axis of the deflection yoke apparatus or the screen.
As shown in FIGS.
10
(
a
) and
10
(
b
), there provide the first opening section
8
a
in a rectangular shape and the second opening section
8
b
, which is narrower and longer in shape than the first opening section
8
a
and jointed to the first opening section
8
a
, on the outer circumference area of the face side flange
1
b.
As shown in FIGS.
11
(
a
) through
11
(
c
), the tongue
8
c
, which is jointed to one end of the first opening section
8
a
opposite to the second opening section
8
b
and comes into the inside of the separator
1
, is formed on the outer circumference area of the face side flange
1
b
. The tongue
8
c
has flexibility, so that it can bend toward the arrow direction shown in FIG.
11
(
a
). Further, the stopper section
8
d
, which is shaped as the letter “L” and comes into the inside of the separator
1
, is formed on the other end opposite to the first opening section
8
a
in the second opening section
8
b
in the outer circumference area of the face side flange
1
b
. Furthermore, the claw
8
e
protruding to the inside of the separator
1
is formed on the inside surface of both ends of the second opening section
8
b
connected to the first opening section
8
a
in the outer circumference area of the face side flange
1
b.
The container section
8
is formed as a pocket by the first opening section
8
a
, the second opening section
8
b
, the tongue
8
c
, the stopper section
8
d
and the claw
8
e
. In the case that the board like magnet
9
is installed into the pocket like container section
8
formed as mentioned above, the magnet
9
is inserted into the container section
8
through the first opening section
8
a
as shown in FIG.
11
(
a
). As shown in FIG.
11
(
b
), the tongue
8
c
is bent toward the inside of the face side flange
1
b
when the magnet
9
touches the tongue
8
c
while being pushed in the container section
8
. As shown in FIG.
11
(
c
), when the magnet
9
is inserted as far as the stopper section
8
d
, the top end of the magnet
9
approximately touches with the stopper section
8
d
and the bottom end of the magnet
9
approximately touches with the tip of the claw
8
e
. Accordingly, the magnet
9
is held in the space between the stopper section
8
d
and the claw
8
e
in the container section
8
.
In the case that the magnet
9
is made from sintered ferrite, ferrite shrinks extremely during a sintering process, so that the external dimension of a magnet varies widely after sintered. Further, in the case that the magnet
9
is made from rubber-like resin dispersed and mixed with powdered ferrite, the outer dimension of a magnet varies widely due to an injection process and a cutting process. Therefore, the dimension of the magnet
9
varies such that an error or a fluctuation of dimension is approximately ±2%, that is, an error of ±0.2 mm occurs to the reference length of 10 mm in general.
Accordingly, in the deflection yoke apparatus containing the magnet
9
in the container section
8
as mentioned above, it is necessary for the dimension of the container section
8
to be more enlarged than the reference dimension of the magnet
9
in consideration of variation of the external dimension of the magnet
9
. In the case that the reference length of the magnet
9
is 10 mm, for example, the actual length of the container section
8
must be formed more than 10.2 mm. If the magnet
9
formed in the minimum dimension is inserted into the container section
8
mentioned above, an extra space of 0.4 mm occurs between the magnet
9
and the container section
8
and causes the magnet
9
to rattle.
Allocation of the magnet
9
contained in the container section
8
differs from variations of the external dimension of the magnet
9
. Accordingly, there existed the problem that the convergence characteristic varies by the external dimension of the magnet
9
. Further, there existed another problem that the initial convergence characteristic is shifted due to the dislocation of
Anderson Kill & Olick
Barrera Ramon M.
Lieberstein Eugene
Meller Michael
Victor Company of Japan Ltd.
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