Sony Corporation

Sony Group Corporation

Emiko Ikeda

Takahisa Tagami

Masaru Uryu

Kunihiko Tokura

Haruka Sakai

Naoya Kunikata

Keisuke Nakashita

Toru Takebe

Satoshi Noguchi

Hiroshi Iki

A vibration system includes a vibration plate and an edge portion disposed around the vibration plate. The vibration plate has a first region and a second region that have shapes asymmetrical with each other. The vibration plate is configured such that a weight difference between the first region and the second region is equal to or smaller than a threshold value and besides stiffness at the edge portion is substantially uniform.

Vibration system, speaker apparatus and video displaying apparatus

A speaker apparatus includes: a magnetic circuit including an annularly formed magnet, a yoke that includes a base surface part and a center pole part protruding from the base surface part, the center pole part being disposed while being inserted into a central part of the magnet, and a plate that is annularly formed and disposed on an outer peripheral side of the center pole part of the yoke while being attached to the magnet; a coil bobbin that is cylindrically formed and is displaceable in an axial direction of the center pole part while a part thereof is fitted onto the center pole part of the yoke; a voice coil that is wound around an outer peripheral surface of the coil bobbin, at least a part thereof being disposed in a magnetic gap formed between the plate and the center pole part of the yoke; and a diaphragm that is connected to the coil bobbin and is caused to vibrate in conjunction with displacement of the coil bobbin, in which a first air passage path and a second air passage path are formed, the first air passage path leading from a back surface side of the diaphragm to a lower surface of the magnetic circuit, the second air passage path being formed in the lower surface of the magnetic circuit and connecting the first air passage path and a side of the magnetic circuit.

Speaker diaphragm and speaker apparatus

Acoustic conversion efficiency is improved and a stable signal reproduction operation is ensured. Provided is a speaker device including: a magnet; a yoke attached to the magnet and at least one sub-plate that is separated from the main plate in an axial direction of the central axis; a coil bobbin formed in a tubular shape and changeable in the axial direction; a voice coil wound around an outer circumferential surface of the coil bobbin, at least a portion of the voice coil being disposed in a main magnetic gap formed between the main plate and the yoke; a vibration plate having an inner circumferential portion connected to the coil bobbin; and a magnetic fluid filling at least one sub-magnetic gap formed between the sub-plate and the yoke, wherein a through-hole positioned in the sub-magnetic gap filled with the magnetic fluid is formed in the coil bobbin.

Speaker device

A speaker device including a magnet formed in a ring shape; a yoke having a center pole portion inserted in the center of the magnet; a plate formed in a ring shape and arranged on an outer circumferential surface of the center pole portion of the yoke while being attached to the magnet; a coil bobbin formed in a cylindrical shape and movable in the axial direction of the center pole portion while being partially fitted on the center pole portion of the yoke; a voice coil wrapped around the outer circumferential surface of the coil bobbin, at least part of the voice coil being arranged in a magnetic gap formed between the plate and the center pole portion of the yoke; a diaphragm having its inner circumferential portion connected to the coil bobbin; and a magnetic fluid filled in the magnetic gap.

Speaker device with a magnetic gap filled with magnetic fluid and changing magnetic flux density in axial and circumferential directions

A speaker includes a ring-shaped magnet, a yoke having a center pole portion inserted in the center of the magnet, and a ring-shaped plate and arranged on the outer circumferential surface of the center pole portion of the yoke and attached to the magnet. The speaker includes a cylindrically-shaped coil bobbin that is movable in the axial direction of the center pole portion and partially fitted on the center pole portion of the yoke. The speaker includes a voice coil wrapped around the outer circumferential surface of the coil bobbin, part of the voice coil being arranged in a magnetic gap, which is filled with a magnetic fluid, formed between the plate and the center pole portion of the yoke. The speaker includes a diaphragm having its inner circumferential portion connected to the coil bobbin, and that is vibrated as the coil bobbin moves.

Speaker device with a magnetic gap filled with magnetic fluid and changing magnetic flux density in axial and circumferential direction

A speaker mounting member for a display apparatus including:

Speaker mounting member for display apparatus

To propose a speaker unit and a speaker apparatus enabling to improve the strength of a voice coil bobbin and sound output in high quality with a simple structure, there are provided that a magnetic circuit forming a magnetic gap in slit form, a frame for storing and holding the magnetic circuit, a diaphragm attached to be vibratable to the frame, a flat-type voice coil bobbin disposed so as to pass through the almost center of the magnetic gap, in that its one end is combined with the diaphragm, a voice coil is adhered to its surface, and convex and concave parts for improving the strength of the diaphragm in the vibrating direction are formed on the surface, and a damper attached to the frame to support the other end of the flat-type voice coil bobbin.

Speaker unit and speaker apparatus

A speaker diaphragm includes a thermoplastic resin having a three-layer structure. The three-layer structure includes a polyester film as a base material of the three-layer structure, a polyimide-based resin layer as a top layer of the three-layer structure, and another polyimide-based resin layer as a bottom layer of the three-layer structure.

Speaker diaphragm and speaker including the same

A speaker includes a magnetic circuit forming a slit-like magnetic gap, a frame that houses and holds the magnetic circuit, a diaphragm attached to the frame so as to be capable of vibrating, a voice coil unit that is placed so as to pass through substantially the center of the magnetic gap, and has its one end coupled to the diaphragm, and a damper attached to the frame to support the other end of the voice coil unit. The voice coil unit has a planar-type coil bobbin section, and a voice coil section having a coil member wound in a planar track shape and disposed so as to extend through the coil bobbin section from one side to the other side and from the other side to the one side.

Speaker, voice coil unit, and method of manufacturing the voice coil unit

A loudspeaker damper including: an outer damper; and an inner damper; wherein the outer damper and the inner damper configured to damp a vibrating portion relative to a fixed portion of a loudspeaker, wherein the outer damper supports the outer periphery of a voice coil of the vibrating portion, and supports the outer periphery of the voice coil relative to the fixed portion, wherein the inner damper supports the inner periphery of the voice coil, and supports the inner periphery of the voice coil relative to the fixed portion.

Loudspeaker damper and method of mounting loudspeaker damper

There is provided an acoustic diaphragm which includes a diaphragm base material composed of a paper article comprised of fine mica flakes, pulp fibers, and polyvinyl alcohol fibers and formed to be a multi-cellular structure; and a sheet material combined with the paper article or the diaphragm base material.

Growing community of inventors

Tokyo, Japan

Emiko Ikeda