Kabushikikaisha Kenwood

Junichi Hayakawa

Yoshio Sakamoto

Takaharu Ichiryu

Hiroshi Miyazawa

Yutaka Hattori

Syuuhei Ohta

Shirou Iwakura

Okihiro Kobayashi

Nobuhiro Miyahara

Masaya Kasai

An optical acoustoelectric transducer having a directivity pattern like a betterby receiving by a light-receiving element a reflected fraction of the light from a light-emitting device disposed at the center of a bottom plate that is parallel to a diaphragm, has an opening through which an acoustic wave enters, and is connected to supporting side plates. An optical acoustoelectric transducer having uniform amplitude characteristics in a wide frequency range by mixing by a mixer circuit the outputs of a plurality of optical microphones having diaphragms of mutually different thicknesses so as to make the receiving sensitivity uniform in different frequency ranges. A directional optical acoustoelectric transducer having a small size and wide band characteristics by arranging a plurality of light-emitting devices (LD) and a plurality of light-receiving elements (PD) corresponding to a plurality of diaphragms arranged parallel.

Optical acoustoelectric transducer

In a diaphragm for a loud-speaker of the present invention, an increase in tensile strength is averagely attained as a whole, and the over all diaphragm is uniformly colored without showing any lattice pattern. The diaphragm includes a woven fabric comprising yarns made from a blend of a plurality of fibers wherein at least one of the plurality of fibers is PBO (poly(p-phenylene benzobisoxazole)) fiber.

Cloth for loudspeaker diaphragm, loudspeaker diaphragm, and loudspeaker

A speaker diaphragmis provided having an improved quality of radiation sounds and a good outer appearance. The speaker diaphragm has in its slanted area projections typically represented by a peak lineand recesses typically represented by a bottom line. The projection typically represented by the peak line extends radially from the central area to the edge portion, and curves along the circumferential direction as it comes near to the edge portion. While the speaker diaphragmvibrates at a large amplitude and moves toward the bottom side thereof, a rotation force is applied to air which is likely to concentrate upon the central area to thereby lower the air pressure to the central area. The speaker diaphragmhas a three-dimensional structure like a screw propeller so that the mechanical strength of the speaker diaphragmcan be increased over the whole area thereof and division vibrations can be suppressed. The speaker diaphragm is manufactured by ejection molding of material containing polypropylene as it main composition so that a variety of colors can be easily used during manufacture processes. In cooperation with the unique structure like the screw propeller, a strong visual impression is given.

Loudspeaker diaphragm

A very thin screen speaker and a support leg for supporting the screen speaker without a dead space of installing the screen speaker. There is provided a speaker system having a screen for image projection formed on a front plate constituting a cabinet of the speaker system, wherein a diaphragm system is disposed between the front plate and a back plate constituting the cabinet, the diaphragm system being assembled by components including a voice coil, a diaphragm, and a suspension, and the depth of both the sound paths being equal to the distance from the inner surface of the front plate to the inner surface of the rear plate.

Speaker system and its support legs

A low sound loudspeaker system is constructed of an acoustic pipe extending from the back side of a loudspeaker unit, an air chamber provided at the front side of the loudspeaker unit, and a bass reflex port provided within the air chamber. The acoustic pipe communicates with the air chamber via the aperture of the acoustic pipe.

Growing community of inventors

Kawasaki, Japan

Junichi Hayakawa