Electrical connectors – With circuit component or comprising connector which fully... – Termination circuit
Reexamination Certificate
2001-02-21
2002-03-12
Sircus, Brian (Department: 2839)
Electrical connectors
With circuit component or comprising connector which fully...
Termination circuit
Reexamination Certificate
active
06354880
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to the structure of a CRT (Cathode-Ray-Tube) socket for connecting a cathode ray tube used in a color television, etc., and particularly relates to a resistance element connecting structure ofthe CRT socket in which a resistance element is connected in series with a focus contact.
2. Description of the Background Art
In a CRT socket for connection to a cathode ray tube, an undesired radiating signal is generated by a high frequency signal applied to a cathode ofthe cathode ray tube through a focus circuit block. The high frequency signal influences the focus of an electronic beam. A terminal connected to a flyback transformer is attached to the CRT socket. Conventionally, a resistance element is connected in series between this terminal and a focus contact in the interior of the CRT socket to reduce the above influence.
The resistance element can be connected by directly soldering lead portions on both sides of the resistance element to the terminal and the focus contact. However, it is very difficult to make a soldering connecting work within a housing of the CRT socket, wherein the CRT socket is made as compact as possible.
Referring now to
FIGS. 11-13
, conventionally, a resistance element connecting structure
100
of the CRT socket connects both side lead portions of the resistance element in press contact with press contact slits concavely arranged in the terminal and the focus contact. A CRT socket
101
is assembled by attaching parts, to be described later, to a housing main body
102
from the rear. The housing main body
102
is formed by integrally molding a cylindrical housing
102
a
on one side (a lower side in
FIG. 11
) and a generally box-shaped housing
102
b
on the other side. A bottom face side of the box-shaped housing
102
b
has an open face to enable attachment of the constructional parts. After all ofthe parts are installed, the open face of the box-shaped housing
102
b
is covered with a bottom cover
102
c.
The cathode ray tube is connected to a planar side of the cylindrical housing
102
a
. The cathode ray tube is attached from a bottom face side of the cylindrical housing
102
a
in contact with pins of a neck portion of the cathode ray tube such that plural contacts
104
are located on the same circular circumference on this plane side.
A contact
104
F in
FIG. 11
among these contacts
104
is a focus contact to which a high voltage is particularly applied in comparison with the other contacts
104
. A connecting portion
105
at one end of this focus contact is pulled out into the lower measure type housing
102
b
to reliably insulate the focus contact from the other contacts
104
.
As shown in
FIG. 13
, an end portion of the connecting portion
105
is bent in a downward U-shape. Two parallel press contact slits
106
are concavely formed in the bent portion. A connecting piece
107
a
of a focus side discharge electrode plate
107
is press-fitted into one press contact slit
106
. The press contact slit
106
is electrically connected to the focus side discharge electrode plate
107
. The focus side discharge electrode plate
107
has a center of the focus side discharge electrode plate
107
projecting in a spherical or conical shape.
The focus side discharge electrode plate
107
is attached to a side wall surrounding a discharge air gap chamber
108
formed within the box-shaped housing
102
b
(see FIG.
12
). The focus side discharge electrode plate
107
is positioned opposite to a ground side discharge electrode plate
109
similarly formed such that the focus side discharge electrode plate
107
and the ground side discharge electrode plate
109
form a discharge gap within the discharge air gap chamber
108
. This discharge gap remains quiescent while a normal voltage is applied to the focus contact
104
F. When a discharge occurs within the cathode ray tube, the discharge gap discharges spark energy of this discharge to the ground side discharge electrode plate
109
to prevent discharged electric current from flowing in the reverse direction from the focus contact
104
F to a semiconductor element within a circuit.
In
FIG. 12
, a terminal storing concave portion
111
is concavely arranged from an open face
103
on a side partitioned by a partition wall
110
from the discharge air gap chamber
108
within the box-shaped housing
102
b
. A terminal
112
is stored to the terminal storing concave portion
111
. In the terminal
112
, an external connecting portion
112
a
and a resistance connecting portion
112
b
are continuously integrated with each other. A portion of the terminal storing concave portion
111
for storing the external connecting portion
112
a
extends through a plane side of the box-shaped housing
102
b
. One end of an external lead wire
114
, having its other end connected to a flyback transformer, is inserted from the plane side into this through hole where it comes into elastic contact with an elastic contact piece
112
c
of the external connecting portion
112
a.
Similar to the end portion of the connecting portion
105
, as shown in
FIG. 13
, the resistance connecting portion
112
b
is bent in a downward U-shape. A press contact slit
116
is concavely formed in this bent portion. Both side lead portions
115
a
of the resistance element
115
are respectively press-fitted into press contact slits
116
,
106
of end portions of this resistance connecting portion
112
b
and the connecting portion
105
from the open face
103
of the box-shaped housing
102
b
. Thus, the resistance element
115
is connected in series between the focus contact
104
F and the flyback transformer.
In this connecting work, it is sufficient to press-fit both end lead portions
115
a
of the resistance element
115
to the press contact slits
116
,
106
respectively formed in the terminal
112
. The connecting portion
105
of the focus contact after the terminal
112
and the focus contact
104
F are attached into the box-shaped housing
102
b
. Accordingly, soldering is not required. Therefore, the connection is easily made.
However, it is desirable to make the CRT socket in a shape that is as compact as possible in order to accomplish high density mounting. But the conventional resistance element connecting structure
100
positions the resistance element
115
parallel to the open face
103
of the box-shaped housing
102
b
. Therefore, the space required for the resistance element
115
is enlarged in a plane direction of the box-shaped housing
102
b
and thereby interferes with the desire to make the CRT socket
101
compact.
Therefore, as shown in
FIG. 14
, a resistance element connecting structure
120
for storing the resistance element
115
in a vertical direction with respect to a box-shaped housing
121
has also been developed. In this resistance element connecting structure
120
, both end lead portions
115
a
of the resistance element
115
are press-fitted into press contact slits
124
,
124
formed in a terminal
122
. A connecting portion
123
is connected to an unillustrated focus contact. The resistance element
115
is stored toward a side of a terminal storing concave portion
125
along an attaching direction of the terminal
122
.
However, in this resistance element connecting structure
120
, the resistance element
115
is attached after the terminal
122
and the focus contact are attached from an open plane side (an upper side in
FIG. 14
) of the box-shaped housing
121
. Therefore, the lead portions
115
a
of the resistance element
115
are press-fitted to the press contact slits
124
,
124
of the terminal
122
and the connecting portion
123
from the open plane side (the upper side) using a jig. Accordingly, there is no storing space for the resistance element
115
on an inner side (lower side) onto which the terminal
122
or the focus contact is attached. Therefore, the only available storing space is located in a space between the terminal
122
and the focus contact. As a result, the
Dinh Phuong K T
Morrison Law Firm
Sircus Brian
SMK Corporation
LandOfFree
Resistance element connecting structure of CRT socket does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Resistance element connecting structure of CRT socket, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Resistance element connecting structure of CRT socket will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2870976