Victor Company of Japan, Limited

Jvc Kenwood Corporation

Satoshi Imamura

Shinji Kamimura

Junji Iino

Toshikatsu Kuwahata

Tomoaki Ogata

Takeshi Hirano

A speaker includes a box-shaped enclosure, a speaker unit and a sounding board. A pair of side plates, a bottom plate, a top plate, a back plate and a baffle are assembled into the enclosure. The speaker unit is attached to an opening portion of the baffle. The sounding board is attached to the bottom plate, and includes a member having a fiber direction in a vibration direction of a vibrating plate, a member having a fiber direction in a direction which approaches the side plate (of the front side) as extending from a side of the back plate to a side of the baffle, and a member having a fiber direction in a direction which approaches the side plate (of the back side) as extending the side of the back plate to the side of the baffle.

Speaker

A voice coil includes a cylindrical bobbin formed of a first material; a coil which surrounds on an outer circumferential surface of the bobbin; and a plurality of reinforcement members formed of a material having a propagation speed faster than the first material and provided on the outer circumferential surface of the cylindrical bobbin.

Voice coil and speaker

A voice coil includes a bobbin formed of a wooden sheet obtained by slicing natural wood to a predetermined thickness and a coil that surrounds an outer circumference of the bobbin.

An acoustic diaphragm includes a diaphragm formed of a uniform material and a first standing wave suppression member provided on a surface of the diaphragm along a first direction of passing through a center of the diaphragm.

Acoustic diaphragm and speaker

On one surface of a piece of wooden sheet, a cloth or paper is adhered to make an adhered sheet. An approximately V-shaped notch is provided on the adhered sheet, the adhered sheet is wetted to be softened, and a lubricant which acts to keep water is impregnated thereinto. Edge portions of the notch are overlapped, and the adhered sheet is tentatively molded in an approximately horn shape by a first hot press molding. The adhered sheet is then dried, impregnated with thermosetting resin, and half-dried. The adhered sheet is subject to a second hot press molding. A moisture-proof agent is applied on the adhered sheet, a center hole for a voice coil and periphery are removed to make a speaker diaphragm having a predetermined dimension and shape.

Growing community of inventors

Gunma-ken, Japan

Satoshi Imamura