Mounting structure, method for manufacturing mounting structure, and radio device
Provided is a mounting structure that can bond a first heat dissipation element to a second substrate through a hole in a first substrate without using a binder such as solder, an adhesive, or the like. A mounting structure of the present disclosure includes a first substrate ( 10 ) in which a penetrating hole ( 11 ) is formed, a second substrate ( 20 ) and a first heat dissipation element ( 30 ) overlapped with both surfaces of the first substrate ( 10 ), respectively, so as to cover the penetrating hole ( 11 ), and a second heat dissipation element ( 40 ) sandwiched and attached between the second substrate ( 20 ) and the first heat dissipation element ( 30 ) inside the penetrating hole ( 11 ).
1. A mounting structure comprising:
a first substrate in which a penetrating hole is formed;
a second substrate and a first heat dissipation element overlapped with both surfaces of the first substrate, respectively, so as to cover the penetrating hole; and
a second heat dissipation element sandwiched and attached between the second substrate and the first heat dissipation element inside the penetrating hole,
wherein the second heat dissipation element is a metal spring having elasticity in the first substrate thickness direction,
wherein, inside the penetrating hole, the second heat dissipation element is disposed at a position corresponding to a position where a heat generating component is mounted, the heat generating component being mounted on a surface of the second substrate opposite to a surface facing the first substrate,
wherein the first heat dissipation element includes a projection formed on a surface of the first heat dissipation element facing the second substrate and inserted into the penetrating hole, and inside the penetrating hole, the second heat dissipation element is sandwiched and attached between the second substrate and the projection of the first heat dissipation element,
wherein the projection has a size in the first substrate thickness direction that is smaller than the substrate thickness of the first substrate and does not protrude from the surface of the first substrate that faces the second substrate,
wherein when the second substrate is not mounted on the first substrate, the second heat dissipation element protrudes from the surface of the first substrate that faces the second substrate, and
wherein when the second substrate is mounted on the first substrate, the second heat dissipation element is brought in contact with and pressed against the surface of the second substrate that faces the first substrate.
2. The mounting structure according to claim 1 , wherein
the heat generating component is one of a plurality of heat generating components mounted on the second substrate, and
inside the penetrating hole, additional second heat dissipation elements are disposed at respective positions corresponding to positions where the plurality of the heat generating components are mounted.
3. A radio device comprising a transmission/reception circuit composed of the mounting structure according to claim 1 , wherein
the transmission/reception circuit comprises:
a first circuit block comprising at least an RF (Radio Frequency) front end unit configured to amplify a transmission signal by a power amplifier and amplify a reception signal with low noise by a low noise amplifier; and
a second circuit block other than the first circuit block, wherein
the first circuit block is mounted on the second substrate, and
the second circuit block is mounted on the first substrate.
4. The radio device according to claim 3 , wherein the first circuit block further comprises a converter unit configured to convert the transmission signal from a low frequency signal to a high frequency signal, output the transmission signal to the RF front end unit, convert the reception signal output from the RF front end unit from a high frequency signal to a low frequency signal.
5. A method for manufacturing a mounting structure comprising:
forming a penetrating hole in a first substrate,
overlapping a second substrate and a first heat dissipation element on both surfaces of the first substrate, respectively, so as to cover the penetrating hole, and
sandwiching and attaching a second heat dissipation element between the second substrate and the first heat dissipation element inside the penetrating hole,
wherein the second heat dissipation element is a metal spring having elasticity in the first substrate thickness direction,
wherein, inside the penetrating hole, the second heat dissipation element is disposed at a position corresponding to a position where a heat generating component is mounted, the heat generating component being mounted on a surface of the second substrate opposite to a surface facing the first substrate,
wherein the first heat dissipation element includes a projection formed on a surface of the first heat dissipation element facing the second substrate and inserted into the penetrating hole, and inside the penetrating hole, the second heat dissipation element is sandwiched and attached between the second substrate and the projection of the first heat dissipation element,
wherein the projection has a size in the first substrate thickness direction that is smaller than the substrate thickness of the first substrate and does not protrude from the surface of the first substrate that faces the second substrate,
wherein when the second substrate is not mounted on the first substrate, the second heat dissipation element protrudes from the surface of the first substrate that faces the second substrate, and
wherein when the second substrate is mounted on the first substrate, the second heat dissipation element is brought in contact with and pressed against the surface of the second substrate that faces the first substrate.