Electricity: circuit makers and breakers – Combined with or actuated by connector coupling – Coupling-actuated switch
Reexamination Certificate
2000-06-29
2001-11-20
Scott, J. R. (Department: 2832)
Electricity: circuit makers and breakers
Combined with or actuated by connector coupling
Coupling-actuated switch
Reexamination Certificate
active
06320144
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a coaxial connector switch, and more particularly to such a switch in which a cover plate is attached to a switch portion of a coaxial connector so as to prevent the increase of a contact resistance of the switch portion of the coaxial connector due to the intrusion of flux and also to prevent the intrusion of dust.
2. Description of the Related Art
There has been extensively used a coaxial connector switch which is connected to an antenna on an automobile via a coaxial adapter, connected to the automobile antenna, so that the automobile antenna can be used as an antenna of a portable cellular telephone.
FIG. 3
is a bottom view showing the construction of a conventional coaxial connector switch.
FIG. 4
is a cross-sectional view taken along the line
4
—
4
of
FIG. 3
, showing the construction of the conventional coaxial connector switch.
The construction of the conventional coaxial connector switch will now be described with reference to
FIGS. 3 and 4
. In
FIG. 4
, a dielectric member
21
, in which a center pin
23
is inserted, is fitted on a funnel-shaped outer conductor
24
. The center pin
23
is held in contact with a first contact leg
26
, including a resilient contact arm
25
having a contact projection, and the center pin
23
is urged upward by a resilient force of the first contact leg
26
.
The first contact leg
26
is contacted at its contact projection with a second contact leg
27
so that a signal can be fed from the first contact leg
26
to the second contact leg
27
. When the center pin
23
is pushed by a coaxial adapter
40
, the signal can be fed from the first contact leg
26
to the center pin
23
. This will be described later.
Although not shown in
FIG. 4
, a terminal
28
of the first contact leg
26
and a terminal
29
of the second contact leg
27
are mounted (surface mounted) by reflow soldering on a conductor on a surface of a printed circuit board. Also, first and second terminals
31
and
32
(shown in FIG.
3
), formed on the outer conductor
24
, are mounted (surface mounted) on the conductor of the printed circuit board by reflow soldering.
Next, the operation of the conventional axial connector switch will be described with reference to FIG.
5
. In
FIG. 5
, the coaxial adapter
40
is pushed into the coaxial connector switch in a direction of an arrow, a central conductor
41
abuts against the center pin
21
to push the same downward. As a result, the center pin
21
is moved downward against the bias of the first contact leg
26
, so that the flow of the signal from the first contact leg
26
to the second contact leg
27
is interrupted.
At this time, an outer conductor
42
surrounding dielectric portion
43
of the coaxial adapter
40
is brought into contact with the outer conductor
24
of the coaxial connector switch, so that signals from the terminals
31
and
32
, formed on the outer conductor
24
of the coaxial connector switch, are connected to the outer conductor
42
of the coaxial adapter
40
, and also the signal from the first contact leg
26
of the coaxial connector.
As a result, the flow of the signal from the first contact leg
26
is switched to the central conductor
41
of the coaxial adapter
40
, and therefore the automobile antenna can be used as an antenna of the portable cellular telephone.
In the above conventional coaxial connector switch, however, a cover plate is not provided at the switch portion of the coaxial connector; therefore, the rising of flux due to surface tension during the surface-mounting operation by the reflow soldering can not be prevented, so that the contact resistance is increased by the flux, and in the worst case, there has been encountered a disadvantage that the switch portion has failed to function as a switch.
SUMMARY OF THE INVENTION
This invention seeks to solve the above problem, and an object of the invention is to provide a coaxial connector switch in which the rising of flux during the surface-mounting operation by reflow soldering is prevented so that the contact resistance of the switch will not be increased by the flux.
According to the first aspect of the invention, there is provided a coaxial connector switch wherein a dielectric member, in which a center pin is inserted, is fitted on a funnel-shaped outer conductor, and the center pin is usually urged upward by a resilient arm, forming a switch; characterized in that a cover plate is attached to a switch portion of a coaxial connector so as to prevent the increase of a contact resistance of the switch portion of the coaxial connector due to the intrusion of flux. There is achieved an advantage that the contact resistance of the switch will not be increased by the flux.
According to the second aspect of the invention, there is provided a coaxial connector switch wherein a center pin is inserted, is fitted on a funnel-shaped outer conductor, and the center pin is usually urged upward by a resilient arm, forming a switch; characterized in that a cover plate is closely attached to a switch portion of a coaxial connector so as to prevent the intrusion of dust into the switch portion of the coaxial connector. There are achieved advantages that dust will not intrude into the switch portion from the exterior and that the corrosion of switch contacts is prevented.
According to the third aspect of the invention, the coaxial connector switch is characterized in that cover plate is formed by the same material as that of the dielectric member. There is achieved an advantage that the cover plate can be formed by the same material as that of the dielectric member.
According to the fourth aspect of the invention, the cover plate of the coaxial connector switch has a portion corresponding to the switch portion, which is smaller in thickness than a portion corresponding to terminal portions.
According to the fifth aspect of the invention, and the coaxial connector switch is characterized in that a bottom end of the center pin is pointed. There is achieved an advantage that a load per unit area can be increased; therefore, a first contact leg can be held in contact with the center pin without increasing the resilient force of the first contact leg.
REFERENCES:
patent: 5625177 (1997-04-01), Yukinori et al.
patent: 6030240 (2000-02-01), Duff
patent: 6099334 (2000-08-01), Togashi
patent: 6142803 (2000-11-01), Bozzer et al.
patent: 0924810 A2 (1999-06-01), None
patent: 2307113 A (1997-05-01), None
Matsushita Electric - Industrial Co., Ltd.
Pearne & Gordon LLP
Scott J. R.
LandOfFree
Coaxial connector switch does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Coaxial connector switch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coaxial connector switch will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2579270