Electrical connectors – Preformed panel circuit arrangement – e.g. – pcb – icm – dip,... – With provision to conduct electricity from panel circuit to...
Reexamination Certificate
2000-01-18
2001-06-05
Patel, Tulsidas (Department: 2839)
Electrical connectors
Preformed panel circuit arrangement, e.g., pcb, icm, dip,...
With provision to conduct electricity from panel circuit to...
C439S066000, C439S091000
Reexamination Certificate
active
06241533
ABSTRACT:
BACKGROUND OF THE INVENTION
(1) Field of the Invention
The present invention relates to a press-contact electrical interconnector used for interconnecting a liquid crystal display and a circuit board or interconnecting circuit boards, and an improvement of the method for producing the same.
(2) Description of the Prior Art
There are various kinds of press-contact electrical interconnectors, but recently a U-shape metal line interconnector has been used for interconnecting a liquid crystal display and a circuit board or interconnecting circuit boards. The U-shaped metal line interconnector comprises, as shown in
FIG. 1
, an insulative foam elastomer
15
formed into a block having a section roughly in a half oval shape by using a sponge silicone rubber material; an insulative rubber sheet
2
A having a section roughly in a U shape attached to the surface, a curved one side and the backside on the periphery of the insulative foam elastomer
15
by covering them; and a plurality of conductive threads
3
bonded and secured in a U shape on the surface of the insulative rubber sheet
2
A and provided in proximity in a row arrangement in parallel at equal pitches in the direction of from one end face to the other end face of the insulative foam elastomer
15
s.
The metal line interconnector in a U shape constructed in this manner is pressed against and clamped between an unillustrated electrode of an electronic circuit board, serving as an electrical joiner and an unillustrated electrode of a subject electronic circuit board, serving as an object to be electrically interconnected, to thereby press the electronic circuit board with a pressure, causing elastic deformation in the electronic circuit board. Hence, the electronic circuit board and the subject electronic circuit board are interconnected electrically and softly with a plurality of conductive threads
3
.
Prior art technical references include Japanese Patent Application Laid-Open Hei 9 No. 115577, Japanese Patent Publication Hei 7 No. 105174 and Japanese Patent No. 2796872.
The conventional press-contact electrical interconnector
17
is simply formed by using only a sponge silicone rubber, as described above, hence it has a feature that it easily sticks and lacks a slip property. Therefore, if the height of the electrical interconnector
17
is high, incorporation workability is deteriorated, and interconnection between the electronic circuit board and the subject electronic circuit board becomes very unstable, often causing non-conductivity. As a result, non-interconnection between the electronic circuit board and the subject electronic circuit board occurs, to thereby cause a big problem that the quality thereof cannot be stabilized.
Moreover, the conventional press-contact electrical interconnector is constructed as described above, and has a disposition pitch of the conductive threads
3
as narrow as 50 &mgr;m to 100 &mgr;m, and a diameter of each conductive thread
3
as small as 30 &mgr;m to 40 &mgr;m. Hence, even a small force applied to press the conductive threads
3
can cause deformation in the conductive threads, causing such a problem that the percent defective of products such as mobile phones becomes high. Furthermore, since the surface of the electrical interconnector
17
is easily deformed by only the application of a small force, the interconnection between the electronic circuit board and the subject electronic circuit board becomes very unstable, causing such a problem that it lacks incorporation workability.
SUMMARY OF THE INVENTION
In view of the above situation, it is an object of the present invention to provide a press-contact electrical interconnector which can improve a slip property to improve incorporation workability, stabilize the interconnection between an electrical joiner and an object to be electrically interconnected and stabilize the quality, and a method for producing the same.
Moreover, in view of the above situation, it is an another object of the present invention to provide a press-contact electrical interconnector which can prevent the percent defective of products from increasing due to the deformation caused on a conductive threads or the surface of an electrical interconnector by a small force, and can stabilize the interconnection between an electrical joiner and an object to be electrically interconnected and further improve incorporation workability.
With a view to attaining the above objects, the gist of the present invention is as follows.
A first gist of the present invention is a press-contact electrical interconnector for interconnecting an electrical joiner and an object to be electrically interconnected by being disposed between the electrical joiner and the object to be electrically interconnected, wherein
the electrical interconnector comprises an insulative foam elastomer formed in a columnar shape having a section roughly in a U shape; an insulative rubber sheet having a section roughly in a U shape, which covers a part of the periphery of the insulative foam elastomer; and a plurality of conductive threads provided roughly in a U shape on the surface of the insulative rubber sheet and juxtaposed at roughly equal pitches in the direction of from one end face toward the other end face of the insulative foam elastomer,
the both end faces of the insulative foam elastomer being formed as an insulative exposed face, respectively, and an insulative protective rubber sheet of high hardness being provided in an exposed state on the remaining part of the periphery of the insulative foam elastomer.
A second gist of the present invention is a press-contact electrical interconnector for interconnecting an electrical joiner and an object to be electrically interconnected by being pinched between the electrical joiner and the object to be electrically interconnected, wherein
the electrical interconnector comprises an insulative foam elastomer; an insulative rubber sheet having a section roughly in a U shape which covers the surface, one side and the backside of the insulative foam elastomer, while exposing the both end faces and the other side of the insulative foam elastomer; a plurality of conductive threads provided roughly in a U shape on the insulative rubber sheet and juxtaposed at roughly equal pitches in the direction of from one end face toward the other end face of the insulative foam elastomer; and an insulative protective rubber sheet of high hardness provided on the other side of the insulative foam elastomer;
either one of the plurality of conductive threads on the surface of the insulative rubber sheet and the plurality of conductive threads on the backside thereof being capable of contacting with the electrical joiner, the other being capable of contacting with the object to be electrically interconnected, and the plurality of conductive threads on one side of the insulative rubber sheet being provided with an insulative deformation-restraining rubber sheet of high hardness.
A third gist of the present invention is a method for producing a press-contact electrical interconnector for interconnecting an electrical joiner and an object to be electrically interconnected through conductive threads, by being disposed between the electrical joiner and the object to be electrically interconnected, using an insulative rubber sheet having a plurality of conductive threads disposed on the surface in parallel to each other, a die having a molding space roughly in a U shape in section, and a laminated foam obtained by laminating an insulative protective rubber sheet of high hardness and an insulative foam elastomer material, which comprises:
a process of receiving the insulative rubber sheet in a roughly U shape in section in the molding space of the die, directing the plurality of conductive threads toward the molding face of the molding space, and inserting the laminated foam in the insulative rubber sheet with the protective rubber sheet facing the opening of the insulative rubber sheet;
a process of clamping, heating and pressing the die, to foam and mold the insula
Darby & Darby
Patel Tulsidas
Shin-Etsu Polymer Co. Ltd.
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