JP2013152978A - Cooling substrate, package for housing element, and package structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling substrate improving cooling performance, a package for housing an element which is used in the cooling substrate thereby achieving the sealability, and a package structure.SOLUTION: A cooling substrate 5 includes: a first substrate 14; a frame body 15 provided on the first substrate 14; cavity pipes 16, each of which includes a cavity part 16a provided on a straight line L at a region located on the first substrate 14 and enclosed by the frame body 15 and being hollow, the cavity part 16a where both ends, viewed in a direction along the straight line L, are open, and protruding parts 16b protruding from both side surfaces, viewed in a direction perpendicular to the straight line L of the cavity part 16a, in an interdigital manner, having spaces connecting with the interior of the cavity part 16a, and opening in the direction along the straight line L; and a second substrate 17 provided on the frame body 15 and covering the cavity pipes 16.

Description

  The present invention relates to a cooling substrate, an element storage package, and a mounting structure.

  2. Description of the Related Art Conventionally, an element storage package having an input / output terminal in which a signal line is formed on one main surface of a dielectric layer and a ground layer is formed on the other main surface of the dielectric layer is known. In input / output terminals used at high frequencies such as microwaves and millimeter waves, high-frequency signals are easily transmitted, and thus the temperature tends to become high. In view of this, a technique has been proposed in which a cooling liquid flow path formed in a belt shape is provided to cool the element storage package or the mounting structure (see Patent Document 1 below).

JP 2006-100410 A

  By the way, an element housing package or a mounting structure provided with a cooling liquid flow path simply formed in a belt shape may easily become high temperature because the cooling liquid flows only into the cooling liquid flow path. For this reason, a device storage package or mounting structure that is mounted on an input / output terminal using microwaves, millimeter waves, or other high-frequency waves, which is likely to be small and particularly prone to high temperatures, cannot fully perform its cooling function, and the device storage package Or a crack may generate | occur | produce in a mounting structure and there exists a possibility that sealing performance may be impaired.

  An object of the present invention is to provide a cooling substrate having an improved cooling function, an element storage package excellent in sealing performance by using the cooling substrate, and a mounting structure.

  A cooling substrate according to an embodiment of the present invention includes a first substrate, a frame provided on the first substrate, and a straight line provided in a region surrounded by the frame on the first substrate. And a cavity that is hollow inside and open at both ends in the direction along the straight line, and protrudes in a comb-tooth shape from both side surfaces of the hollow part in a direction perpendicular to the straight line, and the hollow part A hollow tube including a convex portion having a space connected to the inside of the frame and having an opening in the direction along the straight line, and a second substrate provided on the frame and covering the hollow tube. Features.

  An element storage package according to an embodiment of the present invention surrounds the cooling substrate, a mounting substrate provided on the cooling substrate and having an element mounting region on an upper surface, and the mounting region on the mounting substrate. Provided with a sealing frame body partially having a through-mounting hole, and an input / output terminal provided in the through-mounting hole for electrically connecting the frame body and the outside of the frame body It is characterized by that.

  A mounting structure according to an embodiment of the present invention includes the element storage package, an element mounted in the element storage package, and a lid that covers the element provided on the element storage package. It is characterized by comprising.

According to the present invention, it is possible to provide a cooling substrate with an improved cooling function, an element storage package excellent in sealing performance, and a mounting structure by using the cooling substrate.

It is a general-view perspective view which shows the inside of the mounting structure which concerns on one Embodiment. It is a general | schematic perspective view which shows the general appearance of the input / output terminal of an element storage package. It is a general | schematic perspective view which shows the general appearance of the cooling substrate of the element storage package. It is a general | schematic perspective view which shows the inside of a cooling substrate. It is a top view which shows the inside of the cooling substrate shown in FIG. It is a general-view perspective view which shows the state which removed the frame from the cooling substrate shown in FIG. It is the fragmentary perspective view which expanded the A section of FIG. It is the fragmentary perspective view which expanded the B section of FIG. It is sectional drawing which shows the cross section along XX of FIG. It is sectional drawing which shows the cross section along YY of FIG.

  Embodiments of an element storage package according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited to the following embodiment.

<Schematic structure of element storage package>
FIG. 1 is a schematic perspective view showing the inside of the mounting structure according to the present embodiment, and shows a state where a lid is removed. FIG. 2 is a schematic perspective view of the input / output terminal 2 used in the element storage package 2 of FIG. The element storage package 2 is used for a power module in which a home appliance such as a television, an electronic device such as a mobile phone or a computer, a power device, or the like is stored. In particular, it is used for high frequency circuits and power modules of electronic equipment used at high frequencies such as microwaves and millimeter waves.

  The mounting structure 1 includes an element storage package 2, an element 3 mounted in the element storage package 2, and a lid 4 provided on the element storage package 2 and covering the element 3.

  The element storage package 2 is provided on the cooling substrate 5, the mounting substrate 6 provided on the cooling substrate 5 and having the mounting region R of the element 3 on the upper surface, and on the mounting substrate 6 so as to surround the mounting region R. And the input / output terminal 8 provided in the through-mounting hole H and electrically connecting the inside of the sealing frame 7 and the outside of the sealing frame 7. And.

  The element storage package 2 is, for example, an active element such as a semiconductor element, an optical semiconductor element, a power device transistor, a diode or a thyristor, or a passive element such as a resistor, a capacitor, a solar cell, a piezoelectric element, a crystal resonator, or a ceramic oscillator. It is used for mounting the element 3 composed of elements.

  The mounting substrate 6 is a member formed in a square shape when seen in a plan view. The mounting substrate 6 is made of, for example, a metal material such as copper, iron, tungsten, molybdenum, nickel, or cobalt, or an alloy containing these metal materials. The mounting substrate 6 has a function of improving heat conductivity and efficiently dissipating heat generated from the elements 3 mounted in the mounting region R to the mounting substrate 6. The thermal conductivity of the mounting substrate 6 is set to, for example, 15 W / (m · K) or more and 450 W / (m · K) or less.

Further, the mounting substrate 6 is manufactured in a predetermined shape by using a conventionally known metal processing method such as rolling or punching for an ingot obtained by casting and solidifying a molten metal material into a mold. . The length of one side of the mounting substrate 6 is set to, for example, 5 mm or more and 50 mm or less. Moreover, the thickness of the mounting substrate 6 is set to, for example, not less than 0.3 mm and not more than 3 mm.

  The surface of the mounting substrate 6 is plated with nickel or gold by electroplating or electroless plating in order to prevent oxidative corrosion or to easily braze the element 3 to the mounting region R. Is formed. The mounting region R of the mounting substrate 6 is a region that is not connected to the sealing frame 7 when the sealing frame 7 is connected to the upper surface of the mounting substrate 6. In the present embodiment, the mounting substrate 6 has a quadrangular shape. However, as long as the element 3 can be mounted, the mounting substrate 6 is not limited to a quadrangular shape, and may be a polygonal shape or an elliptical shape.

  The sealing frame 7 is a member that is connected along the outer periphery of the mounting region R of the mounting substrate 6 and protects the element 3 mounted on the mounting region R from the outside. Further, the sealing frame body 7 is formed with a through-mounting hole H provided with the input / output terminal 8 in a part of the side surface. The sealing frame 7 is brazed to the mounting substrate 6 via a brazing material. The brazing material is made of, for example, silver, copper, gold, aluminum, or magnesium, and may contain an additive such as nickel, cadmium, or phosphorus.

  The sealing frame 7 is made of a metal material such as copper, iron, tungsten, molybdenum, nickel or cobalt, or an alloy containing these metal materials. The sealing frame 7 has a function of dissipating heat generated from the element 3 to the outside of the sealing frame 7 in a state where the element 3 is mounted in the mounting region R. The thermal conductivity of the sealing frame 7 is set to, for example, 15 W / (m · K) or more and 450 W / (m · K) or less.

  The input / output terminal 8 is provided in the through-mounting hole H of the sealing frame 7. The input / output terminal 8 is formed on the top surface of the first dielectric layer 9 and the first dielectric layer 9 extending in and out of the sealing frame 8, and a signal line that electrically connects the inside and outside of the frame. 10, a ground conductor 11 formed on the lower surface of the first dielectric layer 9, and a second dielectric layer 12 formed on the signal line 10.

  The signal line 10 has a function of transmitting a predetermined electric signal. The signal line 10 is used as, for example, a microstrip line or a coplanar line. The signal line 10 is made of a metal material such as copper, silver, gold, aluminum, nickel, molybdenum, manganese, or chromium, for example. The line width of the signal line 10 is ¼ or less of the wavelength of the signal transmitted to the signal line 10, and is set to 0.1 mm or more and 5 mm or less, for example.

  A lead terminal 13 is formed on the signal line 10. The lead terminal 13 is a member for electrically connecting an external electronic device or the like to the element 3. The lead terminal 13 is connected to the signal line 10 via a brazing material. The signal line 10 and the lead terminal 13 are electrically connected.

  The input / output terminal 8 includes a ground conductor 11 that surrounds the lower surface and side surface of the first dielectric layer 9 and the side surface and upper surface of the second dielectric layer 12. The ground conductor 11 has a function of setting a common potential, for example, a ground potential. The ground conductor 11 is made of a metal material such as copper, silver, gold, aluminum, nickel, molybdenum, manganese, or chromium. The ground conductor 11 is formed in a region overlapping the signal line 10 in plan view. The sealing frame body 7 is made of a metal material, and the ground conductor 11 and the sealing frame body 7 are electrically connected.

The first dielectric layer 9 and the second dielectric layer 12 are insulating substrates, for example, inorganic materials such as aluminum oxide, aluminum nitride, or silicon nitride, or organic materials such as epoxy resin, polyimide resin, or ethylene resin. It is made of a material, a ceramic material such as alumina or mullite, or a glass ceramic material. Or it consists of a composite material which mixed several materials among these materials. The thicknesses of the first dielectric layer 9 and the second dielectric layer 12 are not more than one half of the wavelength of the signal transmitted to the signal line 10 and are, for example, 0.3 mm.
It is set to 5 mm or less.

  The input / output terminal 8 has a ground conductor 11 surrounding the first dielectric layer 9 and the second dielectric layer 12, and the ground conductor 11 is connected to the inner wall surface of the through-mounting hole H and the ground electrode. Is electrically connected. The insertion loss and reflection loss of the high-frequency signal transmitted to the signal line 10 increase in the region where the signal line 10 and the second dielectric layer 12 overlap and the region where the signal line 10 and the ground conductor 11 overlap. Can be suppressed.

  The mounting structure 1 can be configured by flip-chip mounting the element 3 on the element storage package 2 via bumps such as solder. When a semiconductor element such as an IC or LSI or a power device is mounted, for example, silicon, germanium, gallium arsenide, gallium arsenide phosphorus, gallium nitride, or silicon carbide can be used as the semiconductor element.

  FIG. 3 is a schematic perspective view of the cooling substrate 5 and shows a state in which the first substrate 14, the frame body 15 and the second substrate 17 are laminated. FIG. 4 is a schematic perspective view showing the inside of the cooling substrate 5 and shows a state where the second substrate 17 is removed. FIG. 5 is a plan view showing the inside of the cooling substrate 5 and shows a state where the second substrate 17 is removed. FIG. 6 is a schematic perspective view of the cooling substrate 5 and shows a state in which the frame body 15 and the second substrate 17 are removed. FIG. 7 is a perspective view of the portion A of FIG. FIG. 8 is a perspective view of the portion B of FIG. 6, in which the space between the hollow tubes 16 is enlarged. FIG. 9 is a cross-sectional view taken along the line XX in FIG. 5 and shows the through hole T provided in the first substrate 14. FIG. 10 is a cross-sectional view taken along line YY of FIG. 5 and shows a cavity inside the cavity tube 16.

  The cooling substrate 5 is provided on the first substrate 14, the frame 15 provided on the first substrate 14, the region on the first substrate 14 surrounded by the frame 15, and provided on the straight line L. And a convex portion 16b having a space protruding from both side surfaces in a direction orthogonal to the straight line L of the hollow portion 16a and having a space connected to the inside of the hollow portion 16a. A hollow tube 16 and a second substrate 17 provided on the frame 15 and covering the hollow tube 16 are provided. The convex portion 16b has an open side surface in the direction along the straight line L in which the hollow portions 16a are arranged.

  The first substrate 14 is a member having a rectangular outer shape formed in a quadrangular shape when viewed from above. The first substrate 14 is made of, for example, a metal material such as copper, iron, tungsten, molybdenum, nickel, or cobalt, or an alloy containing these metal materials. The first substrate 14 has a good thermal conductivity and transfers heat generated from the element 3 mounted in the mounting region R to the refrigerant filled in the cavity 16 via the first substrate 14, and efficiently outside. It has a function to dissipate. Note that the thermal conductivity of the first substrate 14 is set to, for example, 15 W / (m · K) or more and 450 W / (m · K) or less.

  Further, the first substrate 14 is manufactured in a predetermined shape by using a conventionally known metal processing method such as rolling or punching for an ingot obtained by casting and solidifying a molten metal material into a mold. The The length of one side of the first substrate 14 is set to, for example, 10 mm or more and 100 mm or less. Moreover, the thickness of the 1st board | substrate 14 is set to 0.5 mm or more and 5 mm or less, for example.

The first substrate 14 is provided with a pair of through holes T on a diagonal line of the first substrate 14 in plan view. The through hole T allows the coolant to flow inside the cooling substrate 5. The through hole T has a cylindrical shape, and has a diameter of, for example, 0.5 mm or more and 5 mm or less, and a vertical length of, for example, 0.5 mm or more and 5 mm or less. Note that the refrigerant is a liquid such as water, saline, ammonia water, or a fluorine-based inert liquid, or a gas such as Freon, ammonia, or carbon dioxide.

  The frame body 15 is provided on the first substrate 14 and is provided so as to surround the main surface of the first substrate 14. The frame 15 is connected to the first substrate 14 via, for example, a brazing material. The brazing material is made of, for example, silver, copper, gold, aluminum, or magnesium, and may contain an additive such as nickel, cadmium, or phosphorus.

  Further, the hollow tube 16 has a hollow portion 16a whose inside is arranged on the straight line L and a convex portion 16b which protrudes in a comb-tooth shape from both side surfaces in the direction along the straight line L of the hollow portion 16a. ing. The cavity 16a is open at both ends in the direction along the straight line L. Moreover, the inside of the convex part 16b is a space, and the inside of the convex part 16b is connected to the inside of the hollow part 16a. The hollow tube 16 has a shape in which a plurality of U-shaped members are alternately connected so that the space is continuous.

  The hollow portion 16a is orthogonal to the straight line L when it is assumed that the length of the straight line L from one open end to the other open end is, for example, 6 mm or more and 96 mm or less and there is no convex portion 16b. The length in the direction to be set is set to, for example, 1 mm or more and 5 mm or less. Further, the length from the lower end to the upper end of the hollow portion 16a is set to 0.5 mm or more and 5 mm or less, for example.

  The protrusion 16b has a length from one end connected to the cavity 16a to the other end protruding, for example, of 0.5 mm or more and 4.5 mm or less, and is in a direction along the straight line L of the protrusion 16b. The length is set to, for example, 0.5 mm or more and 5 mm or less. Moreover, the length from the lower end of the convex part 16b to an upper end is set to 0.5 mm or more and 5 mm or less, for example.

  The hollow tube 16 is disposed between the pair of through holes T. The hollow tube 16 is disposed on the first substrate 14 along one side of the first substrate 14, and the lower surface of the hollow tube 16 is joined to the upper surface of the first substrate 14 by a brazing material or the like. As a result, the refrigerant that has flowed into the first substrate 14 from the through hole T can flow into all the hollow tubes 16, can cool all the hollow tubes 16, and can be cooled from the element 3 to the first. The heat transmitted to the substrate 14 is efficiently transmitted to the hollow tube 16 and is radiated from the hollow tube 16 via the refrigerant. In addition, the refrigerant flows through a path from one to the other of the pair of through holes T and flows into the hollow pipe 16, and the refrigerant passes through the side surface of the hollow pipe 16 without passing through the hollow pipe 16. . The refrigerant flowing into the hollow tube 16 can cool the hollow tube 16 from the inside, and the refrigerant passing through the side surface of the hollow tube 16 can cool the side surface of the hollow tube 16.

  Further, in the hollow tube 16, the portion where the convex portion 16 b is provided is open at the portion connected to the hollow portion 16 a and the side surface along the straight line L. Therefore, the refrigerant that has flowed into the hollow pipe 16 is blocked by the wall located at the other end of the convex portion 16b, and flows so as to leak from the opened portion. As a result, the refrigerant that has flowed into the hollow tube 16 flows along the direction of the straight line L without being blocked by the hollow tube 16, and is further branched into a plurality of paths by a wall located at the other end of the convex portion 16b. Since the refrigerant flows in the hollow pipe 16 along the direction of the straight line L in a complicated manner, the refrigerant does not stay in the hollow pipe 16 and can be prevented from being immediately discharged to the outside of the cooling substrate 5 immediately. . As a result, it is possible to reduce the refrigerant that has not sufficiently absorbed heat from flowing out of the cooling substrate 5 in vain. By suppressing the coolant from flowing out of the cooling substrate 5 before absorbing heat, the cooling function of the cooling substrate 5 can be enhanced.

The hollow tube 16 is connected to the first substrate 14 surrounded by the frame body 15 with the entire lower surface of the hollow tube 16 via, for example, a brazing material. The brazing material is made of, for example, silver, copper, gold, aluminum, or magnesium, and may contain an additive such as nickel, cadmium, or phosphorus.

  A plurality of hollow tubes 16 are provided side by side on the first substrate 14. The convex portions 16b are regularly arranged so as to protrude from the side surface of the hollow portion 16a. Furthermore, the distance between the convex portions 16b is set to be the same length. And between the adjacent hollow tubes 16, the convex portions 16b protruding from one hollow tube 16 and the convex portions 16b protruding from the other hollow tube 16 alternately protrude. As a result, a gap having the same shape as that of the hollow tube 16 is formed between the hollow tubes 16 in a complicated manner, and the refrigerant flowing between the hollow tubes 16 flows in the same direction at each position between the hollow tubes 16. By flowing evenly, the heat from the element 3 can be easily transmitted to the refrigerant through the first substrate 14 and the hollow tube 16 without unevenness.

  Further, between the adjacent hollow tubes 16, the convex portion 16b protruding from one of the hollow tubes 16 and the convex portion 16b protruding from the other hollow tube 16 are respectively projected in a straight line L and a sectional view in the vertical direction. It may be arranged so that a part of part 16b overlaps. As a result, it is possible to increase the number of the cavity tubes 16 disposed on the upper surface of the first substrate 14 and increase the contact area between the cavity tubes 16 and the refrigerant, so that the heat transferred from the cavity tubes 16 to the refrigerant can be increased. Can be increased.

  The upper part of the hollow tube 16 is flat, and is joined to the lower surface of the second substrate 17 by a brazing material or the like. Then, by connecting the upper surface of the cavity tube 16 to the lower surface of the second substrate 17, the heat of the element 3 can be effectively transferred from the second substrate 17 to the refrigerant through the cavity tube 16. The heat of the mounting substrate 6 can be transmitted to the refrigerant via the 17.

  The cooling substrate according to the present embodiment is sufficient by intentionally providing a plurality of locations where the refrigerant uniformly contacts the surface of the cavity pipe 16 without flowing in and staying in the refrigerant flowing in in a complicated manner. It is possible to prevent the refrigerant that has not absorbed heat from flowing to the outside unnecessarily, and the refrigerant to which the heat of the element 3 has been transmitted stays inside the hollow tube 16 or the frame body 15 and the cooling substrate 5 Accumulation without being discharged to the outside can be suppressed. Further, the coolant flows evenly inside the hollow tube 16 and the frame body 15, so that sufficient heat is transmitted from the element 3 to the hollow tube 16 through the mounting substrate 6, the first substrate 14, and the second substrate 17. Therefore, it is possible to realize a cooling substrate with an improved cooling function.

  In addition, the element storage package or the mounting structure according to the present embodiment is a small package using a high frequency such as a microwave or a millimeter wave or a package used for a power module by using the cooling substrate described above. However, it is possible to suppress the occurrence of cracks in the element storage package and the input / output terminals by suppressing the high temperature, and the element can be operated normally. Sealability can be maintained over a long period of time, and the mounting structure can be operated normally. As a result, it is possible to realize an element storage package and a mounting structure that are excellent in sealing performance and that can operate normally over a long period of time.

  In addition, this invention is not limited to the above-mentioned form, A various change, improvement, etc. are possible in the range which does not deviate from the summary of this invention.

<Method for manufacturing mounting structure>
Here, a method for manufacturing the element storage package 2 shown in FIG. 1 will be described. First, each of the mounting substrate 6 and the sealing frame 7 is prepared. Each of the mounting substrate 6 and the sealing frame 7 is manufactured in a predetermined shape by using a metal processing method on a solidified ingot obtained by casting a molten metal material into a mold.

  Next, the input / output terminal 8 is prepared. Here, the production of the input / output terminal 8 when the material of the first dielectric layer 9 and the second dielectric layer 12 is an aluminum oxide sintered body, an aluminum nitride sintered body, a mullite sintered body, or the like. A method will be described.

  Specifically, when the material of the first dielectric layer 9 and the second dielectric layer 12 is made of an aluminum oxide sintered body, an organic binder is added to the raw material powder such as aluminum oxide, silicon oxide, magnesium oxide and calcium oxide, Prepare a slurry by adding and mixing plasticizer or solvent.

  Then, the molds of the first dielectric layer 9 and the second dielectric layer 12 are prepared, the frame body is filled with a slurry-like aluminum oxide material, and the first dielectric layer 9 before sintering is filled. Then, the second dielectric layer 12 is taken out. The second dielectric layer 12 is decomposed into at least two layers before the second dielectric layer 12 is sintered. The two layers include a plate-like first layer laminated on the signal line 10 and a plate-like second layer laminated on the first layer, and are formed by laminating these layers.

  Moreover, a high melting point metal powder such as tungsten or molybdenum is prepared, and an organic binder, a plasticizer, a solvent, or the like is added to and mixed with the powder to obtain a metal paste. Then, the signal line 10 is formed by applying a metal paste to the upper surface of the extracted first dielectric layer 9 of the precursor using, for example, a screen printing method. In addition, when the first dielectric layer 9 and the second dielectric layer 12 are combined, the ground conductor 11 is formed at a location surrounding both by using, for example, a screen printing method.

  Next, the second dielectric layer 12 of the precursor is placed on the first dielectric layer 9 of the precursor and pressed to be brought into close contact with each other. Then, by firing the laminate on which the metal paste is printed and applied at a temperature of about 1600 ° C., the input / output terminal 8 made of ceramic on which the base member is formed can be produced. And the input / output terminal 8 is fitted and connected to the through-mounting hole H of the prepared sealing frame body 7 through a brazing material.

  Next, the cooling substrate 5 is prepared. For the first substrate 14, the frame 15, the hollow tube 16, and the second substrate 17, ingots are prepared by preparing molds according to the respective shapes and casting the molten metal material into the respective molds and solidifying them. On the other hand, it can be manufactured in a predetermined shape by using a conventionally known metal working method such as rolling or punching.

  Furthermore, the cooling substrate 5 can be produced by connecting the prepared first substrate 14, frame 15, cavity tube 16, and second substrate 17 via brazing materials. Then, by providing the mounting substrate 6 on the cooling substrate 5, the element housing package 2 can be manufactured. Further, the mounting structure 1 is manufactured by mounting the element 3 in the mounting region R in the element storage package 2 and further connecting the lid 4 on the sealing frame 7 via the brazing material. Can do.

DESCRIPTION OF SYMBOLS 1 Mounting structure 2 Element storage package 3 Element 4 Lid 5 Cooling board 6 Mounting board 7 Sealing frame body 8 Input / output terminal 9 First dielectric layer 10 Signal line 11 Grounding conductor 12 Second dielectric layer 13 Lead terminal 14 1st board | substrate 15 Frame 16 Cavity pipe | tube 16a Cavity part 16b Convex part 17 2nd board | substrate R Mounting area H Through-mounting hole T Through-hole

Claims (7)

A first substrate;
A frame provided on the first substrate;
A cavity provided in a region surrounded by the frame body on the first substrate, provided on a straight line and having a hollow inside and open at both ends in a direction along the straight line; and the cavity A hollow tube that protrudes from both side surfaces in a direction orthogonal to a straight line and includes a convex portion having a space connected to the inside of the hollow portion and having an opening in the direction along the straight line;
A cooling substrate, comprising: a second substrate provided on the frame and covering the hollow tube. The cooling substrate according to claim 1,
The first substrate has a rectangular outer shape, and a pair of through holes are provided on a diagonal line,
A cooling substrate, wherein a coolant flows from one through hole of the pair of through holes to the other through hole in a region surrounded by the first substrate, the frame body, and the second substrate. The cooling substrate according to claim 1 or 2, wherein
A plurality of the hollow tubes are provided side by side on the first substrate;
Between the adjacent hollow tubes, the convex portion of one hollow tube and the convex portion of the other hollow tube protrude alternately. The cooling substrate according to any one of claims 1 to 3,
The cooling substrate according to claim 1, wherein an upper portion of the hollow tube is flat and is connected to a lower surface of the second substrate. The cooling substrate according to claim 2,
The cooling substrate according to claim 1, wherein the refrigerant flows through at least one of the inside of the hollow tube and between the hollow tubes. The cooling substrate according to any one of claims 1 to 5,
A mounting substrate provided on the cooling substrate and having an element mounting region on an upper surface;
A sealing frame body that is provided so as to surround the mounting area on the mounting substrate and has a through-mounting hole in part;
An element storage package comprising an input / output terminal provided in the through-mounting hole for electrically connecting the frame body and the outside of the frame body. The device storage package according to claim 6;
An element mounted in the element storage package;
A mounting structure comprising: a lid body provided on the element storage package and covering the element.

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