Electric device
An electric device includes an electric board having a board hole, a housing accommodating the electric board, a shaft portion disposed in the housing and inserted into the board hole, a recessed portion disposed in the housing, and a bonding portion. The bonding portion is interposed between the shaft portion and the recessed portion and between the recessed portion and a hole peripheral portion of the electric board that forms a peripheral edge of the board hole, and bonds the shaft portion, the hole peripheral portion, and the recessed portion. The board hole has a size such that a radial gap is provided between the hole peripheral portion of the electric board and the shaft portion.
1 . An electric device comprising:
an electric board having a board hole;
a housing accommodating the electric board;
a shaft portion disposed in the housing and having a tip end and a base end, the base end fixed to the housing, the shaft portion being inserted into the board hole;
a recessed portion disposed in the housing, fixed to the housing, and having a recess that is recessed so as to face the tip end of the shaft portion; and
a bonding portion interposed between a hole peripheral portion that forms a peripheral edge of the board hole of the electric board and the recessed portion and between the shaft portion and the recessed portion, formed of an adhesive, and bonding the shaft portion, the hole peripheral portion, and the recessed portion, wherein
the board hole has a size such that a gap is provided between the hole peripheral portion and the shaft portion.
2 . The electric device according to claim 1 , wherein
the bonding portion has elasticity and is softer than the shaft portion and the recessed portion.
3 . The electric device according to claim 1 , wherein
the recessed portion is disposed apart from the shaft portion and the hole peripheral portion, and
the bonding portion is disposed so as to fill the gap between the hole peripheral portion and the recessed portion and a gap between the shaft portion and the recessed portion.
4 . The electric device according to claim 1 , wherein
the housing includes a base to which the base end of the shaft portion is fixed, and a one-side cover that is disposed on one side in an axial direction of the shaft portion with respect to the base and to which the recessed portion is fixed,
the recessed portion is disposed on the one side in the axial direction with respect to the electric board and the shaft portion,
the one-side cover has a cover peripheral edge portion at a peripheral edge of the one-side cover,
the base has a base peripheral edge portion at a peripheral edge of the base, and
the cover peripheral edge portion and the base peripheral edge portion are bonded to each other such that a boundary between the one-side cover and the base is sealed.
5 . The electric device according to claim 4 , wherein
the recess of the recessed portion is recessed toward the one side in the axial direction,
the cover peripheral edge portion has a groove that is recessed toward the one side in the axial direction, and
the base peripheral edge portion has a groove insertion portion inserted into the groove of the cover peripheral edge portion and bonded to the cover peripheral edge portion.
6 . The electric device according to claim 1 , wherein
the housing includes a facing portion that faces one surface of the electric board and extends along the one surface, and
the facing portion is bonded to the one surface.
7 . The electric device according to claim 4 , wherein
the electric board has one surface provided on the one side in the axial direction, and
the one-side cover has a facing portion that faces the one surface, extends along the one surface, and is bonded to the one surface.
8 . The electric device according to claim 1 , further comprising:
a driving unit disposed in the housing; and
a terminal configured to electrically connect the electric board and an outside of the housing, wherein
the electric board has a circuit configured to drive the driving unit,
the terminal includes a terminal protruding portion exposed from an inner wall surface of the housing and protruding toward the electric board, and
the terminal is connected to the electric board at a tip end of the terminal protruding portion.
9 . The electric device according to claim 8 , wherein
the terminal includes a terminal bent portion between a portion penetrating the housing and the terminal protruding portion, and
the terminal bent portion is exposed from the inner wall surface of the housing.
10 . The electric device according to claim 8 , further comprising
a terminal metal element configured to electrically connect the driving unit and the electric board, wherein
the terminal metal element includes a terminal metal element protruding portion exposed from a frame that supports the driving unit and protruding toward the electric board,
the terminal metal element is connected to the electric board at a tip end of the terminal metal element protruding portion, and
the terminal metal element protruding portion is longer than the terminal protruding portion.
11 . The electric device according to claim 10 , wherein
the terminal metal element includes a terminal metal element bent portion between an end portion electrically connected to the driving unit and the terminal metal element protruding portion, and
the terminal metal element protruding portion protrudes toward the electric board by the terminal metal element bent portion.
12 . The electric device according to claim 8 , further comprising
a first board attachment portion and a second board attachment portion disposed in the housing, wherein
the shaft portion includes a plurality of shaft portions, the recessed portion includes a plurality of recessed portions, the board hole includes a plurality of board holes, the hole peripheral portion includes a plurality of hole peripheral portions, and the bonding portion includes a plurality of bonding portions,
the first board attachment portion is disposed between a first shaft portion included in the plurality of shaft portions and the housing, and fixes the first shaft portion to the housing, and
the second board attachment portion is disposed between a second shaft portion included in the plurality of shaft portions and the housing, fixes the second shaft portion to the housing, is disposed at a position farther from a connection portion between the terminal and the electric board than the first board attachment portion, and has higher flexibility than the first board attachment portion.
13 . The electric device according to claim 12 , wherein
the first board attachment portion protrudes from a partition wall formed inside the housing and is connected to the inner wall surface of the housing by a connection portion protruding from a side surface of the first board attachment portion.
14 . The electric device according to claim 12 , wherein
the second board attachment portion protrudes from a partition wall formed inside the housing and is apart from the inner wall surface of the housing.
15 . The electric device according to claim 8 , wherein
the driving unit is configured to vibrate a diaphragm of a sounding body to generate sound.