Nidec Pigeon Corporation

Kabushiki Kaisha Sankyo Seiki Seisakusho

Hideo Kitazawa

Kenji Yokoyama

Akinori Ushikoshi

Takamasa Kaneko

A speaker may include a center pole and a voice coil bobbin having a bobbin that may include nonmagnetic and electric conductor layers and insulator layers disposed between the electric conductor layers. An electrostatic capacity, which is formed between the center pole and the voice coil bobbin, is detected and outputted as an electrical signal.

Speaker

A speaker may include a voice coil bobbin and a center pole. The voice coil bobbin may include a nonmetallic pipe body as a base of the voice coil bobbin, a first nonmagnetic and electric conductor film which is formed on an inner peripheral face of the pipe body, and a second electric conductor film which is formed on an outer peripheral face of the pipe body such that the first electric conductor film is covered by the second electric conductor film through the pipe body. An electrostatic capacity that is formed between the voice coil bobbin and the center pole is detected and outputted as an electric signal.

A rotating polygon mirror for optical beam scanning. The polygon mirror is fixed to a rotating shaft and is rotated at a high speed by a drive force of a rotating drive with brushes. Additionally, a magnet is fixed to an inner circumferential surface of a yoke casing that supports the rotating shaft through a bearing, and a rotor core is positioned to confront the magnet fixed to the rotating shaft.

Growing community of inventors

Nagano, Japan

Hideo Kitazawa