JPS6222237B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrical connector for mounting a multi-pin chip carrier package on which an LSI or a very LSI is mounted on a printed circuit board.

Conventionally, electrical connectors for chip carrier packages with multiple pins have been designed to make contact with the package terminals.
The release is performed using a slide lever or a rotary lever. However, such an electrical connector inevitably has a larger size and a more complicated structure due to the slide lever mechanism. Also,
It is difficult to support extremely high-pin packages with over 1000 terminals. In order to cope with this, it is possible to use liquid metal for LSI mounting packages with a large number of pins, but in this case, it is easy to scatter or fall off from the storage part due to impact force, and it is likely to be caused by vibration. It is extremely difficult to maintain stable contact due to instantaneous resonance interruptions and uneven mounting positions.

The purpose of the present invention was to solve the above-mentioned problems, and the purpose of the present invention is to create a conductive contact using a shape memory alloy that recovers its shape due to superelasticity when thermal energy is applied or removed. It is an object of the present invention to provide an electrical connector that can be inserted and removed with an extremely small applied force by configuring the members, and can also form a highly reliable contact state.

The electrical connector according to the present invention includes a ceramic substrate having a plurality of through holes and a heating element printed and arranged adjacent to the through holes, and a pin terminal made of a shape memory alloy and having a longitudinal slit and inserted. A plurality of contacts having an open cylindrical part at the upper end and having a lower end inserted into the through hole of the ceramic substrate, and the ceramic substrate on which the contacts are mounted are accommodated and correspond to the open cylindrical part. a housing having a hole through which a plurality of the pin terminals pass through the housing;
It is characterized in that the open cylindrical portion of the contactor connects or opens the pin terminal in response to a temperature change due to energization of the heating element.

Embodiments of the present invention will be described below with reference to the drawings.

1, 2 and 3 show one embodiment of an electrical connector according to the invention. Referring to each figure, the electrical connector of this embodiment has a plurality of through holes 1a formed in a matrix, a heating element 2 meanderingly printed on the main surface, and lead-out terminals 2a, 2b of the heating element. a ceramic substrate 1 formed by implanting
Open cylindrical portion 4 that receives the inserted pin terminal 8a
a and a contactor 4 made of a shape memory alloy that is fitted into the through hole 1a of the ceramic substrate 1, and a wall surface on which an LSI mounting package 8 (to be described later) is placed, for introducing the pin terminal 8a of this package. It is provided with a plastic housing 6 provided with a plurality of holes 6a and lead-out holes 6a for the lead-out terminals 2a and 2b of the heating element 2. Here, the ceramic substrate 1 with the contacts 4 fitted thereon is shown in the housing 6 from the direction of arrow A.
is fitted in. Furthermore, an LSI mounting package 8 is placed on the electrical connector 7 configured in this manner from the direction of arrow B. In this case, the extraction terminals 2a, 2
When electricity is applied between the terminals B, the heating element 2 generates heat, raising the ambient temperature, and the thermal energy expands the inner diameter of the open cylindrical portion 4a at one end of the contact 4 made of shape memory alloy, which causes the pins of the LSI mounting package 8 to expand. terminal 8
A can be installed as shown in FIG. 3A with low or no insertion force. After installation, pull out terminals 2a, 2b
When the energization is stopped, the heat generated from the heating element 2 decreases, the inner diameter of the open cylindrical part 4a made of shape memory alloy becomes narrower, and the pin terminal 8a and the contact 4 come into pressure contact as shown in FIG. 3B. . In addition, as is well known, the shape memory alloy that makes up the contact 4 remembers its shape in its high-temperature phase, and even if it is considerably deformed at room temperature or low temperature, it will return to its original shape when heated to a high-temperature phase. Since it returns to its original shape and undergoes a reversible shape change, if the LSI mounting package 8 becomes defective, the lead-out terminal 2
A and 2b are energized to generate heat, thereby restoring the inner diameter of the open cylindrical portion 4a of the contact 4 to a state in which it is removed, thereby performing removal.

Note that the shape memory effect (SME) of shape memory alloy (SMA) is generally known and will not be discussed in detail; however, in the electrical connector of this invention, Cu-Al-Ni It is preferable that the contacts and rings are made of an alloy or the like. Furthermore, the present invention is not limited to the connectors for LSI-equipped packages as described above, but can also be applied to, for example, connectors for mounting printed circuit boards of multi-contact sealed switches (SMM).

As explained above, according to the present invention, by configuring the contact member with a shape memory alloy that changes shape by expanding and contracting with thermal energy, it can be inserted and removed with extremely little applied force, and has high reliability. An electrical connector is obtained that can form a contact state. In addition, since it can be easily inserted and removed by supplying thermal energy without providing any special external force applying means,
It is possible to create a compact electrical connector that follows the miniaturization of parts such as LSI and SMM switches.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of an electrical connector according to the present invention, FIG. 2 is a perspective view showing details of the board in FIG. 1, and FIGS. 3A and 3B are contacts of the same embodiment. It is a figure explaining a state. 1... Ceramic substrate, 2... Heating element, 4...
Contactor, 4a...Open cylindrical part, 6...Housing, 8...LSI mounting package, 8a...Pin terminal.

Claims (1)

[Claims] 1. A ceramic substrate having a plurality of through holes and a heating element printed and arranged adjacent to the through holes, and an open cylindrical portion made of a shape memory alloy and having a vertical slit and receiving an inserted pin terminal. a plurality of contacts having an upper end and a lower end inserted into a through hole of the ceramic substrate, and a plurality of pin terminals that house the ceramic substrate on which the contacts are mounted and are located at positions corresponding to the opening cylindrical part. an electrical connector, comprising: a housing having a hole passing through the heating element; the opening cylindrical part of the contactor connects or opens the pin terminal in response to a temperature change due to energization of the heating element.