Panasonic Intellectual Property Management Co., Ltd.

Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Ryo Kuribayashi

Hiroyuki Morimoto

Shinsaku Sawa

Yohei Jin

Satoshi Takayama

Kazutaka Kubo

Takafumi Yuasa

Tetsushi Itano

Hiroyuki Amada

Kenji Yamauchi

Koichi Nakayama

Hitoshi Sato

Mitsukazu Kuze

Hirofumi Higashi

Tomonori Shibuya

Yoshiyuki Takahashi

Kazuyoshi Umemura

Michitaka Oda

Takayumi Daikoku

Shuichi Konno

A loudspeaker diaphragm includes a woven fabric which is a base member, a sealing layer, and a coating layer. The woven fabric includes a first face and a second face on the reverse side of the woven fabric from the first face. The woven fabric is made into the shape of a diaphragm. The sealing layer is disposed on the first face of the woven fabric, and seals the mesh openings surrounded by warp threads and weft threads of the woven fabric. The coating layer is formed of a first composite material which is a mixture of a plurality of first short nanofibers and a first resin. The coating layer permeates the woven fabric from the second face of the woven fabric to the sealing layer.

Loudspeaker diaphragm, method of manufacturing same, and loudspeaker employing same

A loudspeaker device includes a loudspeaker unit and an enclosure. The loudspeaker unit outputs sounds mainly in a first direction, upon receiving an electric signal. The enclosure is configured with at least a part of an interior member of a movable-body device, and secures and accommodates the loudspeaker unit in the inside of the enclosure. The interior member includes a body part, and an accommodation part that accommodates the loudspeaker unit therein and is formed integrally with the body part. The accommodation part is larger in dimension along the first direction than the body part.

Loudspeaker device and movable-body device equipped with the same

A loudspeaker diaphragm includes a cone having a curved surface from the outer to the inner periphery, and an annular edge of which inner peripheral part is bonded to the front side of the outer peripheral part of the cone. When seen from the front, the outer periphery of the cone is defined by smooth connection of three larger-diameter parts tangent to a first circle with a larger diameter, and three smaller-diameter parts each located between adjacent two of the three larger-diameter parts and tangent to a second circle with a smaller diameter. In the cone, a shape defined by connecting together points at the same position on the central axis is more circular as the points approach the inner periphery from the outer periphery. The inner periphery of the edge has a smaller radius than the second circle.

Loudspeaker diaphragm and loudspeaker including same

A loudspeaker includes a frame, a magnetic circuit provided with a magnetic gap, a cone-shaped diaphragm, a voice coil, and an LED. The magnetic circuit is connected to a lower part of the frame. The diaphragm is connected to an outer periphery of the frame. A first end of the voice coil is connected to the diaphragm, and a second end thereof is inserted into the magnetic gap. The LED is provide on an upper part of the frame, and outputs light toward the center of the diaphragm. The LED is disposed such that the diaphragm reflects the light.

Loudspeaker, electronic apparatus using same, and mobile apparatus

A loudspeaker includes a light-emitting element, a frame, a magnetic circuit provided with a magnetic gap, a diaphragm, a voice coil bobbin, and a voice coil. The diaphragm has an inner circumferential end including an end face facing the light-emitting element, and a light guide having a reflecting surface formed thereon and provided at a position where light enters from the end face. The first end of the voice coil bobbin is joined to the inner circumferential end of the diaphragm, and the second end is inserted into the magnetic gap. The voice coil is wound around the second end of the voice coil bobbin. Light from the light-emitting element enters the end face of the diaphragm, is diffused by the light guide, and is reflected on the reflecting surface.

A loudspeaker includes a light-emitting element, a frame, a magnetic circuit provided with a magnetic gap, a diaphragm, a voice coil bobbin, and a voice coil. The diaphragm includes an inner peripheral end portion having an end face to which a light-emitting element is coupled, a light-guide portion, a reflective surface, and an outer peripheral end portion coupled to the frame. The first end of the voice coil bobbin is coupled to the inner peripheral end portion of the diaphragm, and the second end thereof is inserted into the magnetic gap. A voice coil is wound on the second end of the voice coil bobbin.

Loudspeaker, electronic apparatus using loudspeaker, and mobile equipment using loudspeaker

A speaker is disclosed in which a split resonance of a diaphragm main body and a natural resonance of an edge are controlled, achieving a high sound quality while realizing a weight reduction. A diaphragm is composed of a diaphragm main body and an edge. An outer peripheral part of the diaphragm main body is bonded with a peripheral edge of a frame through the edge. An external shape of edge is formed in substantially a perfect circle. While, at least one of the outer peripheral part of the diaphragm main body and an inner peripheral part of the edge, which is a mutual bonding portion, is formed in a different shape than the perfect circle.

Speaker

The present invention provides a diaphragm for a loudspeaker which suppresses divided resonance and shows a stable sound-pressure-frequency characteristic, and a loudspeaker using the diaphragm. The diaphragm includes three or more thick parts () of odd numbers formed radially from a center part to an outer periphery, and semi thick part () formed between the thick parts so as to become thinner gradually from the outer periphery to the center part. Web shaped thin part () is formed at an inner part of the semi thick part.

Diaphragm for loud speaker and loud speaker employing it

A magnetic circuit of the present invention uses a yoke, wherein a thickness of a bottom portionof the yokeis thicker than a thickness of a cylindrical peripheral portionof the yoke. The magnetic circuit of the present invention includes the yoke, a magnetbonded to the bottom portion of the yoke, and a top platebonded to the magnet, the top plate forming a magnetic gap with the cylindrical peripheral portion in between. According to a configuration of the present invention, it is possible to reduce the magnetic saturation in the bottom portion of the yoke and to improve the efficiency of the magnetic circuit. As a result, the configuration contributes to improve the performance and efficiency of a loudspeaker using the magnetic circuit of the present invention.

Growing community of inventors

Osaka, Japan

Ryo Kuribayashi