公开(公告)号：US20190191250A1

公开(公告)日：2019-06-20

申请号：US16217542

申请日：2018-12-12

Applicant: YAMAHA CORPORATION

Inventor： Shinichi FUJITA

IPC: H04R5/04 ,  H04S5/00

CPC classification number: H04R5/04 ,  H03F3/181 ,  H03F3/68 ,  H03F2200/03 ,  H03F2200/189 ,  H04S5/00 ,  H05K1/0219 ,  H05K1/142 ,  H05K1/144 ,  H05K2201/0715 ,  H05K2201/09672

Abstract: An amplifying device includes first and second substrates. The first substrate has a first mounting surface, and the second substrate has a second mounting surface. The first mounting surface of the first substrate that is opposite the second substrate is provided with: a first ground line; a first signal line configured to transfer an audio signal; and a first amplifier configured to amplify the audio signal. The second mounting surface of the second substrate that is opposite the first substrate is provided with: a second grounded line; a second signal line configured to transfer an audio signal; and a second amplifier configured to amplify the audio signal. The first and second grounded lines correspond to each other in position and shape, and overlap in planar view. The first and second signal lines correspond to each other in position and shape, and overlap in planar view.

公开(公告)号：US20190191233A1

公开(公告)日：2019-06-20

申请号：US16217458

申请日：2018-12-12

Applicant: YAMAHA CORPORATION

Inventor： Shinichi FUJITA

IPC: H04R1/02 ,  F16H37/06 ,  H04R1/28

CPC classification number: H04R1/02 ,  F16C21/00 ,  F16C27/00 ,  F16C27/066 ,  F16C2314/00 ,  F16H37/065 ,  H04R1/2807

Abstract: An operating device includes: an operating member operable by a user; a rotation shaft having an end portion provided with the operating member; a first bearing supporting a first portion of the rotation shaft; and a second bearing supporting a second portion of the rotation shaft. The second portion is located nearer to the operating member than the first portion in an axial direction of the rotation shaft.