Electrical connectors – Having circuit interrupting provision effected by mating or...
Reexamination Certificate
2002-10-15
2004-07-13
Hyeon, Hae Moon (Department: 2839)
Electrical connectors
Having circuit interrupting provision effected by mating or...
C439S063000, C439S944000
Reexamination Certificate
active
06761571
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a coaxial connector mounted on a circuit board and, especially, to a coaxial connector having a switch for switching a high-frequency signal circuit.
2. Description of the Related Art
A coaxial connector having a switch is widely used for testing a high-frequency circuit in a portable communication equipment, such as a portable telephone. Such a coaxial connector is described in Japanese Patent Application Kokai Nos. 10-208817 and 10-3968.
FIGS. 11 and 12
show a coaxial connector having a switch disclosed in JP 10-208817. The coaxial connector comprises an insulative housing
2
having an insertion hole
3
, an outer conductor
3
provided outside the insulative housing
2
, and a pair of fixed and movable terminals
5
and
6
provided in a space
4
communicating with the insertion hole
1
. The movable terminal
6
comprises a zigzag portion
7
and a substantially U-shaped contact portion
8
. As shown in
FIG. 11
, when a central conductor
9
of a probe is not plugged into the insertion hole
1
, the contact portion
8
of the movable terminal
6
is pressed against the fixed terminal
5
by the elastic force of the zigzag portion
7
so that the fixed and movable terminals
5
and
6
are electrically connected. However, as shown in
FIG. 12
, when the central conductor
9
of the probe is plugged into the insertion hole
1
, the contact portion
8
of the movable terminal
6
flexes outwardly (downwardly in the drawing) to separate from the fixed terminal
5
so that the fixed and movable terminals
5
and
6
are electrically disconnected.
FIGS. 13 and 14
show a coaxial connector having a switch disclosed in JP 10-3968. The coaxial connector comprises an insulative housing
12
having a cavity
11
, an outer conductor
13
provided outside the insulative housing
12
, a pair of fixed and movable terminals
14
and
15
provided in the cavity
11
, and an elastic member
15
provided under the movable terminal
16
. As shown in
FIG. 13
, when a coaxial plug
17
is not inserted into the cavity
11
, the movable terminal
15
is pressed against the fixed terminal
14
by the elastic forces of the movable terminal
15
itself and the elastic member
16
so that the fixed and movable terminals
14
and
15
are electrically connected. However, as shown in
FIG. 14
, when a central conductor
18
of the plug
17
is inserted into the cavity
11
, the movable terminal
15
is pressed down by the central conductor
18
to elastically deform so that the fixed and movable terminals
14
and
15
are electrically disconnected.
However, the coaxial connector according to JP 10-208817 obtains a desired elastic force by providing the zigzag portion
7
, and, therefore, the transmission line is made long so that the impedance is mismatched, thus making it difficult to improve the electrical characteristics. In addition, since the movable terminal
6
has a complicated shape, it is difficult to miniature the product and the manufacturing process requires a long period of time.
The coaxial connector according to JP 10-3968 has the problem that the stress is concentrated only on a fixed portion
19
of the movable terminal
15
during the flexure and deformation of the movable terminal
15
, and, therefore, it is difficult to obtain a desired elastic force only by the movable terminal
15
. Accordingly, the elastic member
16
is separately provided so that the number of parts is increased, the assembly work is difficult, and it is difficult to minimize the size of the product. In addition, electric current sometimes flows in the elastic member
16
, which provides adverse effects on the high-frequency characteristics
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a coaxial connector with a switch, which makes not only the manufacturing work easy but also the product small, and has the improved high-frequency characteristics.
According to an aspect of the invention, a coaxial connector with a switch mounted on a board comprises an insulative housing having an opening for receiving a central conductor of a coaxial plug from upside, an outer conductor provided outside the insulative housing and engaging with an outer conductor of the coaxial plug such that the plug is attached to or detached from the coaxial connector, a fixed terminal provided under the opening and having a contact portion, and a movable terminal provided under the opening and having a fixed portion fixed to the insulative housing and a cantilevered flexible portion extending from the fixed portion and contacting with the contact portion of the fixed terminal. When the central conductor of the coaxial plug is plugged into the opening of the insulative housing, the central conductor of the coaxial plug abuts against the flexible portion so that the flexible portion separates from the contact portion of the fixed terminal to switch a signal circuit. The flexible portion has at least one cut-off portion at a position located on a side of the fixed portion with respect to an abutting position with the central conductor of the coaxial plug.
The flexible portion, preferably, comprises side faces between which the distance increases from a vicinity of the abutting position toward the fixed portion of the movable terminal and the cut-off portion has a shape formed along the side faces. The cut-off portion, preferably, has a substantially triangular shape.
Alternatively, the side faces are curved from the vicinity of the abutting position toward the fixed portion of the movable terminal in a concave form.
According to another aspect of the invention, a coaxial connector with a switch mounted on a board comprises an insulative housing having an opening for receiving a central conductor of a coaxial plug from upside, an outer conductor provided outside the insulative housing and engaging with an outer conductor of the coaxial plug such that the plug is attached to or detached from the coaxial connector, a fixed terminal provided under the opening and having a contact portion, and a movable terminal provided under the opening and having a fixed portion fixed to the insulative housing and a cantilevered flexible portion extending from the fixed portion and contacting with the contact portion of the fixed terminal. When the central conductor of the coaxial plug is plugged into the opening of the insulative housing, the central conductor of the coaxial plug abuts against the flexible portion so that the flexible portion separates from the contact portion of the fixed terminal to switch a signal circuit. The flexible portion has side faces curved from a vicinity of an abutting position with the central conductor of the coaxial plug toward the fixed portion of the movable terminal in a concave form.
It is preferable that each of the side faces of the flexible portion is formed by a quarter circular arc having a diameter of substantially ½ to 2 times of a difference between a width of the flexible portion at the vicinity of the abutting position of the movable terminal and a width of the fixed portion of the movable terminal.
According to a still another aspect of the invention, a coaxial connector with a switch mounted on a board comprises an insulative housing having an opening for receiving a central conductor of a coaxial plug from upside, an outer conductor provided outside the insulative housing and engaging with an outer conductor of the coaxial plug such that the plug is attached to or detached from the coaxial connector, a fixed terminal provided under the opening and having a contact portion and a fixed portion, and a movable terminal provided under the opening and having a fixed portion fixed to the insulative housing and a cantilevered flexible portion extending from the fixed portion and contacting with the contact portion of the fixed terminal. The fixed portions of the fixed and movable terminals have substantially same width which is greater than a width of the flexible portion of t
Hirose Electric Co. Ltd.
Hyeon Hae Moon
Kanesaka & Takeuchi
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