JPH087621Y2 - Contact pin - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact pin mainly used in electronic equipment.

[0002]

2. Description of the Related Art Heretofore, soldering has been commonly used to connect parts and wiring of electronic equipment. This is also true for electronic devices that have small component dimensions and high packing density.

For example, in a connection terminal portion of a connection cable of an electronic device, a dielectric type or capacitance type filter is provided for each line in order to remove noise mixed in from the line of the cable . For this capacitive filter ,
The feedthrough capacitor (01) shown in FIG. 3 is used to increase the packaging density.

The feedthrough capacitor (01) has a through hole (02) at the center.
The outer and inner surfaces of the through-hole (02) of a cylindrical capacitor body having an outer diameter of about 2 mm having a (03), each electrode (04) (05) in which by forming a capacitor element body (03 der), for example those obtained by firing a powder of barium titanate pressure molded to
Ri, electrode (04) (05) is that is formed by subjecting a thin film of metal on the capacitor element body (03) for example, electroless plating.

In the through hole (02) of this feedthrough capacitor (01) ,
Insert the contact pins of the connection terminal (06), it is common to connect by soldering (07). The outer electrode of the feedthrough capacitor (01) (04) is soldered (09) on both sides of the common ground (08).

[0006]

As described above, when the electrode on the inner surface of the through hole of the feedthrough capacitor and the contact pin are soldered, the molten solder flows between them,
Due to the long-term thermal hysteresis due to the difference in the coefficient of thermal expansion between this electrode and the ceramic sintered body, the thin-walled capacitor body may crack or the electrode body may crack after the initial failure period. May peel off
It An object of the present invention is to provide a contact pin which does not require soldering which causes such a problem.

[0007]

[Means for Solving the Problems] According to the present invention , the above-mentioned section
The problem is the contact pin used to connect the electronic device.
Metal with good elasticity and good electrical conductivity
The thin wire of is wound in a spiral shape with a fine pitch,
The inner diameter of both ends is outside the conductor body of the contact pin.
Slightly smaller than the diameter, and the outer diameter of the intermediate portion is trying to connect
A spiral body slightly larger than the diameter of the through hole
Conductor should be installed in an elastically fitted and locked position on the conductor body.
By inserting the body into the through hole at the connection point
The intermediate portion of the spiral body was pressed against the inner surface of the through hole.
Will be solved.

[0008]

[Action] contact pin of the present invention is, for example, if plugged directly into the through hole of the feedthrough capacitor, the spiral of thin metal wires, tightly engaged with the elastic force to the inner wall of the through hole, without soldering, sufficient to fulfill the electrical connection
Can be.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the contact pin of the present invention viewed from the front. Conductor body of this contact pin (6)
Is preferably 1 mm to 1.5 mm in diameter , and is there elasticity in the part to be inserted and electrically connected ?
One electrical conductivity is attached good metal helix (10).

The spiral body (10) is, for example, phosphor bronze , or one obtained by plating this with gold or the like, and preferably has a wire diameter of 0.05 mm to 0.15 mm.
It is assumed that This is spirally wound, but both ends
(10a) (10a) is slightly smaller than the diameter of the conductor body (6)
And the diameter, the outer diameter of the intermediate portion (10b) is slightly large diameter than the inner diameter of the through hole to be inserted.

[0011] As shown in FIG. 1, the pitch of the winding is between lines
It is relatively small , with the gap less than or equal to the wire diameter. The spiral body (10) thus formed in advance is press-fitted from the end portion of the conductor body (6) to a desired connecting portion. This state is, as shown in FIG. 1
Is shown in.

[0012] both ends of the helix (10) (10a) (10a), since its inner diameter than the diameter of the conductor body (6) is small, these winding portions, with the spring force, firmly conductor Body (6)
Engage the outer surface of the. Also, the middle part (10b) of the spiral body (10)
Is larger than the inner diameter of the through hole to be inserted ,
Of course larger than the diameter of the conductor body (6), therefore,
As shown in FIG. 1, the gap is of form between the conductor body (6)
Has been.

[0013] The contact pins of such a configuration, as shown in FIG. 2
Insert into the through hole (2) of the through capacitor (1) as shown in FIG . The feedthrough capacitor (1) is formed by pressing a powder of a ferroelectric substance such as barium titanate into a cylindrical shape under pressure, firing the electrode body (3) at a high temperature, and penetrating the electrode (4) again. The electrode (5) is formed on the inner surface of the hole (2) by a thin film electrode forming means such as electroless plating.
The feedthrough capacitor (1) is fixed to the common ground (8) by soldering (9).

In the through hole (2) of this feedthrough capacitor (1),
When the contact pin of the present invention shown in FIG. 1 is press-fitted, the inner diameter of the through hole (2) is the diameter of the conductor body (6) plus the spiral body (10).
Because of slightly larger than twice the wire diameter, the ends of the spiral body (10) (10a) is directly passed through the through-hole (2).

However , the outer diameter of the intermediate portion (10b) is a through hole.
Since it is slightly larger than the inner diameter of (2), the outer surface of the intermediate part (10b)
Contacts the electrode (5) on the inner wall of the through hole (2) and is twisted obliquely as long as the pitch allows, and the through hole (2)
Move the inner, the contact state between the inner wall and held with elastic force of the line fit to the through hole (2).

Therefore, the line forming the spiral body (10) is
Conductor body of the contact pin at both ends (10a) (10a)
Electrically firm contact to (6), and <br/> Oite the intermediate portion (10b), firmly in electrical contact with the inner wall of the electrode through-hole (2) (5), thereby, The connection between the contact pin and the inner electrode of the feedthrough capacitor must be ensured.
It

[0017] The contact pins may be not limited to the exemplary feedthrough capacitor, also for attachment to through holes of example wiring board, as it is applied.

[0018]

[Effect of the invention The present invention contact pins are not essential to soldering any way, the through hole of the feedthrough capacitor, to be mechanically and electrically, can also be reliably fixed connection. Thus, unavoidable in soldering when mounting, or impact transmitted directly from the electrode, the thin wall thickness of the capacitor body due to thermal expansion of the metal electrode cracks or peeling of the electrode due to thermal hysteresis, it is possible to completely avoid .

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of a contact pin of the present invention .

FIG. 2 is a vertical cross-sectional view of a main part showing a state in which a contact pin of the present invention is attached to a through hole of a feedthrough capacitor.

FIG. 3 is a vertical cross-sectional view of a main part showing a state in which a conventional contact pin is attached to a through hole of a feedthrough capacitor.

[Explanation of symbols]

 (1) Through capacitor (2) Through hole (3) Capacitor body (4) Electrode (5) Electrode (6) Conductor body (8) Common ground (9) Soldering (10) Spiral body (10a) End (10b) ) Middle part

Claims (1)

[Scope of utility model registration request] 1. A contact pin for use in connection of electronic devices, there is a resilient and electrically conductive properties of good thin metal wire, wound in a fine spiral pitch form
The inner diameter of both ends of the
Slightly smaller than the outer diameter of the main body, and a diameter slightly have large helical than the through hole outer diameter of the intermediate portion is to contact <br/> connection attempt
The body is elastically fitted and locked to the main part of the conductor body.
Insert the conductor body into the through hole at the connection point.
By, the intermediate part of the spiral body is elastically pressed against the inner surface of the through hole.
A contact pin characterized by being made .