Storage device having capacitors in a housing
A storage device according to an embodiment includes a housing, a first board, a memory, and a capacitor. The first board is housed in the housing. The memory is mounted on the first board. The capacitor is in contact with one of the housing and a second board. The capacitor is electrically connected to the first board. The second board is housed in the housing.
1 . A storage device comprising:
a housing including a first support portion, a second support portion, and a metal portion, the first support portion having a first support conductive pad, the second support portion having a second support conductive pad;
a first board in the housing, the first board including a first ground layer and a first facing conductive pad, the first ground layer being electrically connected to the first facing conductive pad, the first facing conductive pad being electrically connected to the first support conductive pad;
a memory on the first board;
a second board in the housing, the second board not overlapping the first board in a thickness direction of the first board, the second board being adjacent to the first board in a longitudinal direction intersecting with the thickness direction of the first board, the second board including a second ground layer and a second facing conductive pad, the second ground layer being electrically connected to the second facing conductive pad, the second facing conductive pad being electrically connected to the second support conductive pad,
a plurality of capacitors in contact with the second board, the plurality of the capacitors including first terminals in one-to-one correspondence with the plurality of the capacitors and second terminals in one-to-one correspondence with the plurality of the capacitors, the plurality of the capacitors being electrically connected to the first board;
a first wiring commonly connected to the first terminals, the first wiring at least electrically connecting the capacitors and the first board, the first wiring being on the second board;
a first conductive pad provided on the first board;
a second conductive pad provided on the second board;
an electroconductive member between the first conductive pad and the second conductive pad, the electroconductive member electrically connecting the first conductive pad and the second conductive pad; and
a fixing member pressing against the electroconductive member to electrically connect the first conductive pad and the second conductive pad,
wherein the first terminals are electrically connected to the first conductive pad via the electroconductive member, the second conductive pad, and the first wiring,
wherein the second ground layer, the second conductive pad, the second support conductive pad, the metal portion, the first support conductive pad, and the first conductive pad form a connection line, and
wherein the second terminals are connected to the connection line.
2 . The storage device according to claim 1 , wherein
the capacitor is fixed to the housing.
3 . The storage device according to claim 2 , wherein
the housing includes a wiring,
the housing has an inner surface,
the wiring is on the inner surface of the housing, and
the capacitor is connected to the first board via the wiring.
4 . The storage device according to claim 3 , wherein
the housing includes a conductor,
the conductor has a flat portion facing the first board, and
the wiring is connected to the first board via the conductor.
5 . The storage device according to claim 4 , wherein
the housing includes a first wall portion and a support portion,
the support portion protrudes from the first wall portion in a thickness direction of the first board,
the support portion supports the first wall portion, and
the conductor is on the support portion.
6 . The storage device according to claim 5 , wherein
the housing includes a first member, a second member, and a fixing member,
the first member includes the first wall portion and the support portion,
the second member includes a second wall portion on an opposite side of the first wall portion with respect to the first board,
the fixing member fixes the first member and the second member,
the support portion has a fixation hole,
the fixing member is inserted into the fixation hole, and
the conductor is around the fixation hole.
7 . The storage device according to claim 6 , wherein
the support portion includes an insulating portion between the conductor and the fixation hole.
8 . The storage device according to claim 3 , wherein
the housing includes a metal portion,
the capacitor includes a cathode, and
the cathode of the capacitor is electrically connected to the metal portion.
9 . The storage device according to claim 8 , wherein
the capacitor includes an anode,
the first board has a first surface, a second surface, a first electrode, and a second electrode,
the second surface is on an opposite side of the first surface,
the first electrode is on the first surface and is connected to the anode of the capacitor via the wiring, and
the second electrode is on the second surface and is connected to the cathode of the capacitor via the metal portion.
10 . The storage device according to claim 1 , wherein
the housing includes a first wall portion and a support portion,
the support portion protrudes from the first wall portion in a thickness direction of the first board,
the support portion supports the first wall portion, and
the plurality of the capacitors are in a height range of the support portion in the thickness direction of the first board.
11 . The storage device according to claim 1 , wherein
the housing has a recess,
the recess is recessed in a direction away from the first board in a thickness direction of the first board, and
when viewed from the thickness direction of the first board, the capacitor is inside the recess.
12 . The storage device according to claim 1 , wherein
the second board has a layer structure having a number of layers smaller than that of the first board.
13 . The storage device according to claim 1 , wherein
the plurality of the capacitors are separated from the first board.
14 . The storage device according to claim 1 , wherein
the plurality of the capacitors align on the second board.
15 . The storage device according to claim 14 , wherein
the second board has a first surface and a second surface, and
the plurality of the capacitors are provided on both the first surface and the second surface of the second board.
16 . The storage device according to claim 1 , wherein
the second board has recesses, and
the plurality of the capacitors are disposed on the recesses.
17 . The storage device according to claim 16 , wherein
the second board has a first surface and a second surface,
each of the first surface and the second surface has recesses, and
the plurality of the capacitors are disposed on the recesses of the first surface and the recesses of the second surface.
18 . The storage device according to claim 1 , wherein
the fixing member has insulation, and
the electroconductive member is fixed to the housing by the fixing member.
19 . The storage device according to claim 1 , wherein the electroconductive member includes a metal spring washer.
20 . The storage device according to claim 1 , wherein the plurality of the capacitors include an electrolytic capacitor.