Chemistry: analytical and immunological testing – Hemoglobin – myoglobin – or occult blood
Reexamination Certificate
1998-03-24
2001-03-20
Sircus, Brian (Department: 2839)
Chemistry: analytical and immunological testing
Hemoglobin, myoglobin, or occult blood
C436S534000
Reexamination Certificate
active
06204065
ABSTRACT:
BACKGROUND OF THE INVENTION AND RELATED ART STATEMENT
The present invention relates to a conduction assist member used for connection between conductors for various electronic equipments, manufacturing method of the same, a connector using the same and an integrated circuit socket using the same.
A conduction assist member functions to assist electrical conduction between connecting elements of a connector by being made to intervene between the connecting elements.
There are several types of connector electrically connecting conductors to each other. For example, in one type of connector, connecting elements have flat conductive surfaces. They are laid one on top of the other and brought into contact with each other so that electrical conduction is made. In another type of connector, one of connecting elements is a plug and the other is a socket, and the plug is fitted in the socket to bring an outer circumferential surface of the plug into contact with an inner circumferential of a socket hole so that the electrical conduction is made. In order to secure sufficient electrical connection in such a connector, it is necessary to bring the connecting elements into close contact with each other. However, if the connecting element has a distortion, or dust or the like exists between the connecting elements, the contact area between the connecting elements becomes small. As a result, close contact between the connecting elements is prevented and electrical connection becomes incomplete.
As a means for solving the above-mentioned problem, Japanese Utility Model Publication (Kokoku) No. 1-22230 discloses a conduction assist member in which a plurality of blades are disposed between two annular frames with a constant interval and obliquely oriented with respect to an outer circumferential surface of a plug, the conduction assist member being disposed around an inner circumferential surface of a socket hole or the outer circumferential surface of the plug. Japanese Utility Model Publication (Kokoku) No. 51-8710 discloses a conduction assist member in which tongue pieces both ends of which are connected to an annular metal band provided with a plurality of cuts, are disposed around an inner circumferential surface of a socket hole or an outer circumferential surface of a plug so that the tongue pieces are obliquely oriented with respect to the outer circumferential surface of the plug.
On the other hand, an integrated circuit such as an IC or an LSI is mounted on a substrate or the like through an integrated circuit socket. Thus, in order to secure sufficient electrical conduction, it is necessary that a contact substrate of the integrated circuit socket, that is, a portion assisting conduction between the integrated circuit and the substrate, is brought into close contact with both of a terminal of the integrated circuit and a terminal formed in the substrate. Further, the contact substrate of the integrated circuit socket used for mounting is required not only to be thin by the demand for miniaturing information processing equipments or the like in recent years but also to have high speed performance in accordance with increase of an amount of information to be processed.
As conventional contact substrates for integrated circuits, the following are exemplified. That is, one contact substrate uses a terminal contact member
35
in which a curved portion
27
is formed to give elasticity in an up-and-down direction, and a support portion
29
for a terminal is formed (FIG.
4
(
a
)). Another contact substrate includes a silicone rubber
30
in which metal thin wires
31
are buried at a high density (FIG.
4
(
b
)). A third contact substrate includes a rubber sheet
32
between both surfaces of which conductive grains
33
are disposed in lines, and when the contact substrate is compressed by a spherical terminal
24
of an integrated circuit, the conductive grains
33
at a compressed portion are brought into contact with one another (FIG.
4
(
c
)). A fourth contact substrate includes a terminal contact member
35
which is buried in a sheet while an end of the terminal contact member is supported by a coil spring
34
and the other end thereof protrudes from the sheet (FIG.
4
(
d
)). A fifth contact substrate includes a terminal contact member
35
which is formed of a randomly wound wire of a conductive material and is buried in a sheet while both ends thereof protrude from the sheet (FIG.
4
(
e
)).
However, the above-mentioned conduction assist member is used in a socket-plug type connector and especially the conduction assist member as disclosed in Japanese Utility Model Publication (Kokoku) No. 51-8710 has a problem in durability such that the tongue pieces or blade portions are damaged or abraded due to repeated use. Furthermore, the conduction assist member has a problem that it must be prepared in compliance with different standards so that it matches with sizes of connectors.
As to the contact substrates for integrated circuits, the contact substrate shown in FIG.
4
(
a
) is inferior in high speed performance and poses a problem that it cannot be used for an integrated circuit socket for mounting.
The contact substrate shown in FIG.
4
(
b
) can hardly be applied to an integrated circuit of the LGA type although it is superior in high speed performance.
Also, with respect to the contact substrate shown in FIG.
4
(
c
), there are problems that conduction is unstable due to a fact that the conductive grains
33
in a line are not brought into sufficient contact with each other or are brought into contact with the conductive grains
33
in another line.
Further, since the contact substrate shown in FIG.
4
(
d
) is required to be thick inevitably due to the structure thereof, it exhibits problems in that it exhibits inferior high speed performance and that it is not suited for mounting use.
Furthermore, the contact substrate shown in FIG.
4
(
e
) poses a problem that it has diversified conduction paths and its electric characteristics become unstable.
SUMMARY OF THE INVENTION
The present invention has been made in view of these circumstances, and an object thereof is to provide a conduction assist member which can be applied to both a flat conduction surface and a curved conduction surface when it is used in a connector, which can easily cope with the difference in size of a connector and a socket when it is used in an integrated circuit socket, which is superior in high speed performance, which can be used in an integrated circuit socket for mounting and which can be easily assembled. Another object of the present invention is to provide a manufacturing method of the above conduction assist member, a connector using the conduction assist member and an integrated circuit socket using the same.
According to the present invention, there is provided a conduction assist member comprising: a sheet made of an insulating elastic material and having a number of through holes; and conduction members disposed in an inside of a part of the through holes or all the through holes, the conduction members comprising a conductive material, wherein a cut piece is fixed to said sheet at an end thereof and has two or more blades which are formed by one, two or more cuts, and wherein one or some of said two or more blades formed on each cut piece are bent toward one of two opening portions of the through hole so that ends of said blades formed on said cut pieces protrude from said opening portions on the same surface of the sheet.
In the conduction assist member of the present invention, at least one of the two or more blades may be bent toward an opening portion toward the other opening portion existing on the other surface of the sheet.
In the conduction assist member mentioned above, it is preferable that each cut piece has two blades which are formed by providing a single cut at the other end.
In the conduction assist member mentioned above two sheets each made of an insulating elastic material are laid one on top of the other and one end of the cut piece is held by the two sheets so that
Burr & Brown
NGK Insulators Ltd.
Prasad Chandrika
Sircus Brian
LandOfFree
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