Matsushita Electric Industrial Co., Ltd.

Yukinori Morohoshi

Shinya Mizone

Asahiko Okada

Nobuo Nakamura

Yoshinobu Sengiku

Eiichi Morimoto

Manabu Muraoka

Teru Kawahara

Kazuto Nakamura

Ryoui Hamaguchi

A loudspeaker diaphragm manufacturing apparatus of the present invention comprises; a paper tank, a pulp dispersion reservoir tank connected to the paper tank, a stirring means provided in the paper tank, a water inlet unit connected to the paper tank, a drain unit disposed under the paper tank, and a paper mold disposed at the bottom of the paper tank or in the drain unit, wherein a sectional area of the drain unit is larger than the plane area of the paper mold. The drain unit may be further provided with a water flow control plate in a draining direction of the paper mold. According to the manufacturing apparatus and the manufacturing method of the present invention, diaphragms with very uniform internal composition and diaphragms with intentionally varied internal composition in accordance with required sound characteristics can be mass-produced with good reproducibility.

Device and method for manufacturing speaker diaphragm, the diaphragm, and speaker

A speaker having a diaphragm with an outer peripheral part. A voice coil is disposed within and coupled to the diaphragm, the voice coil supported by a voice coil bobbin with the voice coil having at least two lead wires. The speaker includes a generally cup-shaped frame with the diaphragm disposed inside of the frame so that an outer peripheral part of the diaphragm is coupled to the frame with a damper disposed inside of the cup-shaped frame so that adhesive on the outer part of the damper is used to adhere the damper to the frame. The speaker is completed with an electric relay terminal coupled to the lead wires of the voice coil, a terminal base coupled to the frame, at least two electric connection terminals coupled to the terminal base, one end of each electric connection terminal projecting inside of the space defined by the cup-shaped frame and coupled to the electric relay terminal at a position above a central part of the damper with the lead wires extending the shortest distance between the voice coil and the electric connection terminals projecting inside the frame so that low frequency resonance is avoided when the speaker is in use.

Speaker

Growing community of inventors

Mie, Japan

Yukinori Morohoshi