Electric part having solder-less terminal metal fitment

Details Electric part having solder-less terminal metal fitment Electric part having solder-less terminal metal fitment

2000-06-19

2002-07-16

Easthom, Karl D. (Department: 2832)

Electrical resistors

Mechanically variable

Movable contact electrically adjustable over length of...

C338S199000, C338S184000

Reexamination Certificate

active

06420957

ABSTRACT:

TECHNICAL FIELD
This invention relates to an electric component with a soldering-less terminal fitment, and more particularly to an electric component equipped with a terminal fitment which permits electrical connection without soldering and a high-voltage variable resistor unit.
BACKGROUND ART
Use of freon is subject to restriction in view of environmental pollution, thus, it is required to connect a terminal conductor, a lead wire or the like to a connection electrode on a circuit board without soldering. This is likewise true of a high-voltage electric component called a focus pack used for adjusting a focus voltage of a cathode ray tube (CRT), a screen voltage thereof or the like.
U.S. Pat. No. 4,471,339 discloses a high-voltage variable resistor including a terminal connection structure for connecting, by means of a terminal fitment like a coiled spring provided at one end thereof with a ring through which a connection conductor or connection terminal is inserted, a connection electrode of the resistor to the connection terminal without soldering.
Also, U.S. Pat. No. 5.546,280 issued to the assignee which corresponds to Japanese Patent Application No. 318669/1994 discloses two kinds of terminal connection structures each constructed so as to connect a core of a lead wire to a connection electrode on a circuit board without soldering.
U.S. Pat. No. 5,546,280 described above also discloses a connection structure having an integral terminal fitment which is integrally provided with a conductor holding section and an elastic or resilient contact terminal section incorporated therein. The terminal fitment is so constructed that the resilient contact terminal section connects the conductor holding section and the electrode arranged on the circuit board to each other without soldering. Further, the patent discloses a structure for connecting a plurality of electrodes on the circuit board and a plurality of connection conductors to each other without soldering.
U.S. Pat. No. 5,508,678 which corresponds to Japanese Patent Application No. 67099/1994 discloses a high-voltage variable resistor which includes such an integral terminal fitment as described above and an insulating casing having a board receiving chamber defined therein and covered with a lid member.
The assignee proposed a soldering-less connection structure having a terminal assembly incorporated therein which includes a terminal fitment including two conductor holding sections and a conductive coiled spring arranged between the terminal fitment and an electrode on a circuit board, as disclosed in Japanese Patent Application Laid-Open Publication No. 189316/1998 (Japanese Patent Application No. 350137/1996). Now, an electric component disclosed in the Japanese publication will be described with reference to
FIGS. 3A
to
4
, wherein
FIG. 3A
shows a conventional electric component or high-voltage variable resistor unit,
FIG. 3B
shows an insulating casing,
FIG. 3C
is a sectional view taken along line C—C of FIG.
3
A and
FIG. 4
shows a circuit board. The high-voltage variable resistor proposed includes an insulating casing
1
integrally made of an insulating resin material and a circuit board
3
made of a ceramic material. The circuit board
3
is formed on a front surface thereof with a variable resistance circuit pattern including an input electrode E
1
, a focus voltage output electrode E
2
, a screen voltage output electrode E
3
, a ground electrode or earth electrode E
4
, a focus voltage adjusting resistance element R
1
, a screen voltage adjusting resistance element R
2
and the like. The circuit board
3
has through-holes H
1
, H
2
and H
3
formed at a central portion of the input electrode E
1
, the ground electrode E
4
and the focus voltage output electrode E
2
to which a capacitor is connected, respectively. The through-holes H
1
, H
2
and H
3
have an input connection conductor
61
, a ground connection conductor and a capacitor connection conductor
59
inserted thereinto, respectively.
The insulating casing
1
, as best seen in
FIG. 38
, is formed at one end thereof or a bottom end thereof with an opening. The insulating casing
1
is formed therein with a board receiving chamber
5
, a fixed resistance substrate receiving chamber
6
and a capacitor receiving chamber
7
. The fixed resistance substrate receiving chamber
6
and capacitor receiving chamber
7
are arranged so as to communicate with each other. The insulating casing
1
includes a double outer peripheral wall structure constituted by an inner wall
9
and an outer wall
11
each formed into a closed loop-like configuration. The inner wall
9
and outer wall
11
are arranged so as to define a rectangular ring-like fit groove
13
therebetween. The outer wall
11
has a wall portion
11
a
arranged along the capacitor receiving chamber
7
, which functions as a partition wall for separating the board receiving chamber
5
and capacitor receiving chamber
7
from each other. The inner wall
9
Is provided on an inner surface thereof with a rib
15
which acts as a board support rib for supporting the circuit board
3
thereon. The circuit board
3
is interposedly supported between the rib
15
and a board contact rib of a cover or lid member
51
described hereinafter. When the lid member
51
is not provided with the board contact rib, the circuit board
3
may be joined to the rib
15
by means of an adhesive. The opening of the insulating casing
1
is formed with an opening-side peripheral wall
17
, which is arranged so as to surround the opening except one side thereof. The peripheral wall
17
is fitted in a fit groove formed on a casing of a fly-back transformer.
The inner wall
9
of the insulating casing
1
which defines the board receiving chamber
5
is formed thereon with four terminal fitment fit sections
19
,
21
,
23
and
25
. The terminal fitment fit sections
19
and
21
include a terminal fitment
29
which is arranged in correspondence to the focus voltage output electrode E
2
and a terminal fitment
29
which is arranged in correspondence to the screen voltage output electrode E
3
fitted therein, respectively. In the prior art, the terminal fitment fit sections
19
,
21
,
23
and
25
each have the terminal fitment
29
which is formed into the same configuration fitted therein. The terminal fitment fit sections
19
,
21
,
23
and
25
are provided on a portion thereof facing the opening with coil spring receiving portions
19
A,
21
A,
23
A and
25
A for receiving coiled springs
30
therein, respectively.
The insulating casing
1
is provided on an upper wall thereof with four expansions
31
,
33
,
35
and
37
in correspondence to the terminal fitment fit sections
19
,
21
,
23
and
25
, respectively. The expansions
31
and
33
each constitute a connection conductor inserting portion into which a connection conductor such as a pin terminal, a lead wire or the like is inserted. The expansions
31
and
33
are formed with through-holes
39
and
42
, respectively. Between the Inner wall of the insulating casing
1
which defines the board receiving chamber
5
and the front surface of the circuit board
3
is defined a space in which two slide elements are rotatable received. In
FIG. 3A
, reference numerals
43
and
45
each designate an operation shaft rotatable extending through the upper wall of the insulating casing
1
so that the slide element may be operated from an outside of the insulating casing
1
.
The fixed resistance substrate receiving chamber
6
, as shown in
FIG. 3B
, has a so-called bleeder resistance
47
received therein. The bleeder resistance
47
is interposedly supported between two holding portions
49
and
50
provided in the fixed resistance substrate receiving chamber
6
so as to vertically extend therein.
The board receiving chamber
5
, as shown in
FIG. 3C
, is closed with a lid member
51
made of a synthetic resin material substantially identical with or similar to that for the insulating casing
1
. The lid member
51
is formed on a rear surfac

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