Abstract: A tool holder (1) includes a clamping member (4) for clamping and holding a tool (5), a holder body (2) having, at a leading end thereof, a receiving portion (25) for receiving the clamping member (4) along an axis (AX) and an operational member (N) for attaching the clamping member (4) to the holder body (2). The clamping member (4) clamps the tool (5) by an operation of the operational member (N). Vibration is applied to a contact portion (T) between the clamping member (4) and the holder body (2) when the clamping member (4) clamps the tool (5).

Abstract: A tool holder (1) includes a clamping member (4) for clamping and holding a tool (5), a holder body (2) having, at a leading end thereof, a receiving portion (25) for receiving the clamping member (4) along an axis (AX) and an operational member (N) for attaching the clamping member (4) to the holder body (2). The clamping member (4) clamps the tool (5) by an operation of the operational member (N). Vibration is applied to a contact portion (T) between the clamping member (4) and the holder body (2) when the clamping member (4) clamps the tool (5).

Abstract: A printed circuit board and multiple components, which are mounted on both sides of the printed circuit board, form a circuit to drive a motor. The printed circuit board is opposed to a case at a one side. First thermal conductive portion is interposed between a heat generating component of the components and the case. Second thermal conductive portion is interposed between the circuit board and the case. The first and second thermal conductive portions are formed of the same flexible material, are equipped to the same side of the circuit board, are in contact with both the circuit board and the case, and are located at different positions.

Abstract: A printed substrate having a first surface to which an electronic component is to be fixed through an underfill material includes a groove that is recessed from the first surface. The first surface includes a pair of lands that is to be electrically connected to the electronic component. The groove extends in a first direction in which the pair of lands extends and is located in a facing region of the first surface in which the first surface is to face the electronic component. An electronic device includes the printed substrate, the electronic component fixed to the first surface and the underfill material disposed between the first surface and the electronic component.

Abstract: A printed circuit board and multiple components, which are mounted on both sides of the printed circuit board, form a circuit to drive a motor. The printed circuit board is opposed to a case at a one side. First thermal conductive portion is interposed between a heat generating component of the components and the case. Second thermal conductive portion is interposed between the circuit board and the case. The first and second thermal conductive portions are formed of the same flexible material, are equipped to the same side of the circuit board, are in contact with both the circuit board and the case, and are located at different positions.