Electronic device and method for manufacturing same

An electronic device includes: a support member; an electronic component stacked over the support member with a plurality of connections therebetween; and a refrigerant pipe through which a refrigerant passes, the refrigerant pipe being provided between at least some connections among the plurality of connections. A method for manufacturing an electric device includes: stacking an electronic component over a support member with a plurality of connections therebetween; and providing a refrigerant pipe, through which a refrigerant passes, between at least some connections among the plurality of connections.

CROSS-REFERENCE TO RELATED APPLICATION

This application is based upon and claims the benefit of priority of the prior Japanese Patent Application No. 2013-137437 filed on Jun. 28, 2013, the entire contents of which are incorporated herein by reference.

FIELD

The embodiments discussed herein are related to an electronic device and a method for manufacturing the electronic device.

BACKGROUND

An electronic device is known including a support member, an electronic component mounted on the support member, and a cooling device that is in contact with the electronic component on the side of the electronic component that is opposite to the side facing the support member. In such an electronic device, the cooling device is deemed to be capable of cooling the electronic component.

However, in the electronic device described above, the cooling device is in contact with the electronic component on the side of the electronic component that is opposite to the side facing the support member. Accordingly, there is a concern that the cooling performance of the electronic component on the side facing the support member is low compared with the cooling performance of the electronic component on the side that is opposite to the side facing the support member.

The following are reference documents:

[Document 2] Japanese National Publication of International Patent Publication No. 2003-533057, and

SUMMARY

According to an aspect of the invention, an electronic device includes: a support member; an electronic component stacked over the support member with a plurality of connections therebetween; and a refrigerant pipe through which a refrigerant passes, the refrigerant pipe being provided between at least some connections among the plurality of connections.

DESCRIPTION OF EMBODIMENTS

Hereinafter, the embodiments of a technique disclosed in the present application will be described.

As illustrated inFIG. 1, an electronic device10according to the present embodiment includes a substrate20, an integrated circuit30(a semiconductor chip), and a flow path unit40.

The substrate20is an example of a support member and is formed in a square shape in planar view. A wiring pattern (not shown) is formed on the substrate20. As illustrated inFIG. 2, a plurality of pads22is formed on the surface of the substrate20. The plurality of pads22are aligned in an array and are connected to the wiring pattern (not shown) described above.

The integrated circuit30(a large scale integration or LSI circuit) is an example of an electronic component and is formed in a flat plate-like square shape in planar view. The integrated circuit30includes a silicon layer31and a circuit layer32. The circuit layer32is an example of a heating part and generates heat. A plurality of bumps34that are arranged in an array are provided on the circuit layer32at a position that corresponds to the position of the plurality of pads22. The plurality of bumps34are an example of a plurality of connections. The integrated circuit30, in which the circuit layer32faces the substrate20, is stacked on the substrate20with the plurality of bumps34therebetween. Furthermore, the circuit layer32is connected to the plurality of pads22with the plurality of bumps34therebetween. An underfill resin36is filled in the gaps between the substrate20and the integrated circuit30.

As illustrated inFIG. 1, the flow path unit40includes a first hollow member41, a second hollow member42, and a plurality of refrigerant pipes43. The first hollow member41and the second hollow member42have a hollow shape and are formed so as to be symmetrical with each other about a line. The first hollow member41includes a long plate-shaped first fixing plate44and a recessed first connection member45. The first fixing plate44closes an opening of the first connection member45having the recessed shape (see the lowest figure ofFIG. 5also). Similarly, the second hollow member42includes a long plate-shaped second fixing plate46and a recessed second connection member47. The second fixing plate46closes an opening of the second connection member47having the recessed shape.

A cylindrical first connection port48and a cylindrical second connection port49are formed in the first connection member45and the second connection member47, respectively. The inside of the first connection port48is in communication with the internal space of the first hollow member41and the inside of the second connection port49is in communication with the internal space of the second hollow member42. Furthermore, the internal space of the first hollow member41is in communication with the internal space of the second hollow member42through the plurality of refrigerant pipes43.

Each of the refrigerant pipes43is, as described later, formed of a single hollow fiber (seeFIG. 3also) and extends in a linear manner between the first hollow member41and the second hollow member42. Moreover, the plurality of refrigerant pipes43are disposed between the substrate20and the integrated circuit30. As illustrated inFIG. 2, the plurality of bumps34, which are arranged in an array, form a plurality of bump groups35that are arranged in a plurality of rows (seeFIG. 6also).

Moreover, in the state in which the substrate20and the integrated circuit30are stacked together, the plurality of refrigerant pipes43that are embedded in the underfill resin36are provided between the plurality of bump groups35. As an example, in the present embodiment, a plurality of (two as an example) refrigerant pipes43each formed of a single pipe are provided between the plurality of bump groups35that form a plurality of rows. The plurality of refrigerant pipes43are provided so as to be in contact with a surface30A (a surface of the circuit layer32), which is the surface of the integrated circuit30on the substrate20side.

Moreover, as illustrated inFIG. 1, in the electronic device10, hoses51and52are connected to the first connection port48and second connection port49, respectively. Furthermore, a refrigerant that is supplied from an external refrigerant supply device (not shown) to the first connection port48through the hose51flows through the plurality of refrigerant pipes43via the internal space of the first hollow member41.

Furthermore, the refrigerant that has passed through the plurality of refrigerant pipes43is conveyed to the second connection port49through the internal space of the second hollow member42and is returned to the external refrigerant supply device from the second connection port49via the hose52. The refrigerant is circulated between the external refrigerant supply device and the plurality of refrigerant pipes43in the above described manner. Furthermore, the refrigerant passing through the plurality of refrigerant pipes43allows heat to be exchanged between the refrigerant and the circuit layer32illustrated inFIG. 2; accordingly the circuit layer32is cooled. Note that a coolant, which is an example of the refrigerant, is used.

A method for manufacturing the electronic device10described above will be described next.

First, as illustrated in the upper figure ofFIG. 4, the first fixing plate44and the second fixing plate46are stacked together such that a plurality of holes53formed in the first fixing plate44and a plurality of holes53formed in the second fixing plate46are in communication with one another. Then, a sewing machine mechanism60sews a needle thread71through and sews a bobbin thread72along the first fixing plate44and the second fixing plate46. A single hollow fiber, which will become the refrigerant pipes43(seeFIGS. 1 and 3) described above, is used for the needle thread71. A synthetic fiber such as, for example, nylon (a registered trademark), polyethylene, or polyester is used for the hollow fiber.

The sewing machine mechanism60includes a sewing needle62having a needle hole61, a bobbin63around which the bobbin thread72is wound, and a rotary hook64that rotates around the bobbin63. The bobbin63is rotated in the direction of an arrow R1to feed the bobbin thread72from the bobbin63. Furthermore, the sewing needle62, the needle hole61of which is threaded with the needle thread71, sequentially passes through the plurality of holes53. The rotary hook64rotates in the direction of an arrow R2, which is a direction opposite to the rotating direction of the bobbin63, the needle thread71is formed into a loop73, and the bobbin thread72is inserted through the loop73of the needle thread71.

Furthermore, the sewing machine mechanism60is operated to form, in the needle thread71, a plurality of U-shaped turn-back portions74that are passed through the plurality of holes53in a sequential manner from the first fixing plate44side. At this time, gaps76are formed between the first fixing plate44and connection portions75, the connection portions75being formed between the plurality of turn-back portions74of the needle thread71. Furthermore, the bobbin thread72fed from the bobbin63is provided along the surface of the second fixing plate46that is the surface on the opposite side to the first fixing plate44and is passed through the distal end portions74A of the plurality of turn-back portions74. Then, the distal end portions74A of the plurality of turn-back portions74are fixed to the second fixing plate46.

Next, as illustrated in the lower figure ofFIG. 4, in a state in which the distal end portions74A of the plurality of turn-back portions74are fixed to the second fixing plate46, the first fixing plate44is moved away from the second fixing plate46. Accordingly, the plurality of turn-back portions74is stretched.

Then, as illustrated in the top figure ofFIG. 5, each of the plurality of holes53is filled with a hole filler54. The hole filler54fixes a proximal end portion74B and the distal end portion74A of the plurality of turn-back portions74to the first fixing plate44and the second fixing plate46, respectively. Next, a cutting tool65is moved along the surface of the first fixing plate44that is the surface on the opposite side to the second fixing plate46; accordingly, the connection portions75of the needle thread71between the plurality of turn-back portions74are removed. Furthermore, in a similar manner, the cutting tool65is moved along the surface of the second fixing plate46that is the surface on the opposite side with respect to the first fixing plate44; accordingly, the distal end portions74A of the plurality of turn-back portions74are removed. Then, as illustrated in the middle figure ofFIG. 5, the plurality of refrigerant pipes43(seeFIG. 7also) are formed from the remaining portions of the needle thread71.

Next, as illustrated in the bottom figure ofFIG. 5, the first connection member45is fixed to the first fixing plate44. The first fixing plate44and the first connection member45form the first hollow member41. In a similar manner, the second connection member47is fixed to the second fixing plate46. The second fixing plate46and the second connection member47form the second hollow member42. Accordingly, the flow path unit40including the first hollow member41, the second hollow member42, and the plurality of refrigerant pipes43is formed.

Next, as illustrated in the upper left figure ofFIG. 6, the flow path unit40is disposed on the substrate20. At this time, the plurality of pads22that are arranged in an array form a plurality of pad groups23that form a plurality of rows. The flow path unit40is positioned on the substrate20so that, in planar view, each of the pairs of refrigerant pipes43is positioned between the plurality of pad groups23, which form a plurality of rows.

Referring next to the upper right figure ofFIG. 6andFIG. 2, in a state in which the flow path unit40is disposed on the substrate20, the integrated circuit30is stacked onto the substrate20from a side of the plurality of the refrigerant pipes43that is opposite to the substrate20side of the refrigerant pipes43. Then, the plurality of bumps34that are provided on the surface of the integrated circuit30that is on the substrate20side are connected to the plurality of pads22. Accordingly, each of the pairs of refrigerant pipes43is arranged between the plurality of bump groups35that are arranged in rows.

Next, as illustrated in the bottom left figure ofFIG. 6, the underfill resin36is filled between the substrate20and the integrated circuit30. Then, as illustrated in the bottom right figure ofFIG. 6, the hoses51and52are connected to the first connection port48and second connection port49, respectively. The fabrication of the electronic device10is completed in the above manner.

The functions and the advantageous effects of the present embodiment will be described next.

As illustrated inFIG. 2, in the electronic device10fabricated in the above manner, each pair of refrigerant pipes43is provided between the substrate20and the integrated circuit30and between the plurality of bump groups35that are arranged in rows. The refrigerant is passed through the refrigerant pipes43and heat is exchanged between the refrigerant and the integrated circuit30; accordingly, the cooling performance of the integrated circuit30on the substrate20side may be obtained.

In particular, the integrated circuit30includes the circuit layer32that generates heat and is stacked on the substrate20with the circuit layer32side of integrated circuit30on the substrate20side. Moreover, the plurality of refrigerant pipes43are provided on the circuit layer32side of the integrated circuit30. Accordingly, the heat generating circuit layer32may be efficiently cooled by the refrigerant passing through the plurality of refrigerant pipes43.

Moreover, the refrigerant pipes43are provided so as to be in contact with the surface30A of the integrated circuit30that is the surface on the substrate20side, in other words, the refrigerant pipes43are provided so as to be in contact with the surface of the circuit layer32. Accordingly, the efficiency of heat exchange between the refrigerant passing through the refrigerant pipes43and the circuit layer32may be further improved and, as a result, the heat generating circuit layer32may be cooled in a further efficient manner.

Furthermore, since the refrigerant pipes43are hollow fibers, thin and inexpensive refrigerant pipes43may be formed. Moreover, since the refrigerant pipes43are each a single pipe, the refrigerant pipes43may be disposed between the plurality of bumps34even if the spaces between the plurality of bumps34are narrow, for example.

Modifications of the present embodiment will be described next. In the embodiment described above, as illustrated inFIG. 2, the plurality of refrigerant pipes43are disposed between the plurality of bump groups35that form the plurality of rows. However, the refrigerant pipes43do not have to be provided between some of the bump groups35among the plurality of bump groups35that form the plurality of rows. Furthermore, the plurality of refrigerant pipes43may be provided only between some of the bumps34among the plurality of bumps34.

Furthermore, as illustrated inFIG. 8, the plurality of refrigerant pipes43may be provided so as to wind through some of the pads22among the plurality of pads22. Accordingly, the refrigerant pipes43may be provided between the bumps34among the plurality of bumps34that correspond to the plurality of pads22. Furthermore, the plurality of refrigerant pipes43may be formed in a winding manner so as to be provided between all of the plurality of bumps34or may be formed such that the plurality of refrigerant pipes43only wind through some of the bumps34among the plurality of bumps34.

When the refrigerant pipes43wind around in the above described manner, the length of each of the refrigerant pipes43may be increased; accordingly, the cooling area per refrigerant pipe43may be increased. Note that the refrigerant pipes43may be formed in a winding manner in advance by molding. Alternatively, the refrigerant pipes43may be made to extend in a winding manner by adhering the refrigerant pipes43to the substrate20with an adhesive or the like and by bending the refrigerant pipes43from the adhered point.

Furthermore, in the embodiment described above, as illustrated inFIG. 2, the plurality of (two as an example) refrigerant pipes43each formed of a single pipe are provided between the plurality of bump groups35that form the plurality of rows. However, as illustrated inFIG. 9, a single piece of refrigerant pipe43formed of a single pipe may be provided between the plurality of bump groups35that form the plurality of roles.

Furthermore, a single piece of refrigerant pipe43formed of a single pipe may be provided between some of the bump groups35among the plurality of bump groups35, and a plurality of refrigerant pipes43each formed of a single pipe may be provided between some of the remaining bump groups35among the plurality of bump groups35.

Furthermore, in the embodiment described above, each of the plurality of refrigerant pipes43is a single pipe. However, as illustrated inFIGS. 10 and 11, each of the plurality of refrigerant pipes43may be, for example, a plurality of single pipes (as an example, three single pipes in the present modification), which are formed of hollow fibers, stranded together. Configured as such, the mechanical strength of each refrigerant pipe43, which is formed of single pipes stranded together, may be secured.

Furthermore, in the embodiment described above, a single-layered integrated circuit30is mounted on the substrate20; however, as illustrated inFIG. 12, integrated circuits30, which are examples of the electronic component, may be mounted on the substrate20three-dimensionally, in other words, stacked and mounted in three dimensions.

Each integrated circuit30is arranged so that the circuit layer32faces the substrate20. Furthermore, the plurality of bumps34, which are an example of the plurality of first connections, are provided between the substrate20and the integrated circuit30of the lowermost layer (the lower layer in the present case) among the plurality of integrated circuits30. Similarly, a plurality of bumps84, which are an example of the plurality of second connections, are provided between the plurality of integrated circuits30. Furthermore, an underfill resin86, similar to the underfill resin36filled into the gap between the integrated circuit30and the substrate20, is filled into the gaps between the plurality of integrated circuits30.

Furthermore, the integrated circuit30of the lower layer among the plurality of integrated circuits30is provided with through-electrodes88. The plurality of bumps34and the plurality of bumps84are connected through the through-electrodes88. Furthermore, the refrigerant pipes43, which are examples of a first refrigerant pipe, are each provided between the plurality of bumps34, and refrigerant pipes93, which are examples of a second refrigerant pipe, are provided between the plurality of bumps84. Similar to the refrigerant pipes43, the refrigerant flows through the refrigerant pipes93, and the refrigerant pipes93are in contact with the surface30A of the integrated circuit30of the upper layer on the substrate20side (the surface of the circuit layer32).

Configured as such, the refrigerant is passed through each of the refrigerant pipes43and93. Since heat is exchanged between the refrigerant and the integrated circuits30, the circuit layer32of each integrated circuit30may be cooled individually. In particular, the cooling performance of the circuit layer32of the integrated circuit30of the lower layer may be obtained even if a plurality of integrated circuits30is mounted three-dimensionally.

Note that in the modification illustrated inFIG. 12, among the plurality of integrated circuits30that are mounted three-dimensionally, the integrated circuit30of a first layer (the lower layer) may be regarded as an example of a support member, and the integrated circuit30of the layer that is provided above the first layer may be regarded as an example of the electronic component.

Furthermore, in the modification illustrated inFIG. 12, the integrated circuit30may be stacked in three or more layers. Furthermore, the refrigerant pipes43may be provided only between some of the bumps34among the plurality of bumps34, and further, the refrigerant pipes93may be provided only between some of the bumps84among the plurality of bumps84. Furthermore, the plurality of integrated circuits30may be mounted on the substrate20after the integrated circuits30have been stacked together; alternatively, the integrated circuits30may be stacked onto the substrate20in order from the integrated circuit30of the lower layer to the integrated circuit30of the upper layer.

Furthermore, in the embodiment described above, the electronic device10includes the substrate20, the plurality of bumps34, and the integrated circuit30as examples of the support member, the plurality of connections, and the electronic component, respectively. However, the embodiment described above may be applied to other electronic devices having a support member other than the substrate20, connections other than the plurality of bumps34, and an electronic component other than the integrated circuit30. Furthermore, the electronic component of such electronic devices may be, in its entirety, a heating part.

Furthermore, in the embodiment described above, each of the refrigerant pipes43is formed of, as an example, a hollow fiber. However, each refrigerant pipe43may be a component other than the hollow fiber. Moreover, a fluid other than the coolant may be employed as the refrigerant.

Furthermore, the plurality of modifications described above may be also applied to the method for manufacturing the electronic device10described above.

Furthermore, in the embodiment described above, the refrigerant is supplied from the external refrigerant supply device to the first connection port48through the hose51, and the refrigerant is returned to the external refrigerant supply device from the second connection port49through the hose52. However, the refrigerant may be supplied from the external refrigerant supply device to the second connection port49through the hose52, and the refrigerant may be returned to the external refrigerant supply device from the first connection port48through the hose51.

Furthermore, as illustrated in the lower figure ofFIG. 4, in the method for manufacturing the electronic device10according to the present embodiment, the first fixing plate44is moved apart from the second fixing plate46. However, the second fixing plate46may be moved apart from the first fixing plate44, alternatively, the first fixing plate44and the second fixing plate46may be moved apart from each other.

Furthermore, among the plurality of modifications described above, those that are capable of being combined with each other may be combined and implemented as appropriate.