Pioneer Corporation

Tohoku Pioneer Corporation

Other

Koji Matsumoto

Yasuhisa Abe

Satoshi Hachiya

Takashi Suzuki

Koji Takayama

Hiroyuki Tomiyama

Michihiro Ogahara

Shunji Takeda

A diaphragm () of a speaker () includes a vibrating member having a substantially thin-plate shape and a base material disposed substantially at the center in a width direction of the vibrating member. The base material is formed by a woof group, a front diagonal thread group, a back diagonal thread group and a warp group, the groups being arranged so as to cross with each other and have axial directions different from each other. Accordingly, tensile strengths of the diaphragm () in the axial directions of the groups, i.e., tensile strengths in four directions, can be set to substantially the same. Accordingly, since the number of directions having substantially the same tensile strength is larger than conventional arrangements using triaxial fabrics, occurrence of deformation such as bending of the diaphragm () due to resonance can be prevented as compared to the conventional arrangements. Therefore, the speaker () capable of vibrating properly can be provided.

Diaphragm and speaker

A diaphragm for a speaker is made by forming acrylic foam. As the material of the acrylic foam, using maleic anhydride and methacrylic amide are contained. Thereby, the coefficient of saturated water absorption can be reduced. When the diaphragm thus manufactured is used for a speaker device, the decrease of strength due to the water absorption and the deterioration of the sound quality can be prevented even in a humid environment.

Diaphragm for speaker and manufacturing method thereof

A speaker diaphragm that has a high heat-radiation efficiency. The speaker diaphragm includes a diaphragm main body made from a resin, and a metallic plate adhered to a major acoustic surface of the diaphragm main body adjacent a voice coil bobbin. The voice coil bobbin is attached to the diaphragm man body.

Speaker diaphragm

There is provided an electrically conductive damper device for a speaker in which local bending is reduced and break-downs of material of the damper and metallic wires incorporated in the damper are prevented, by additionally providing one or more sheets of damper fabric as a reinforcing damper and by bonding it to a main damper by way of various kinds of resin, in order to reinforce a neck portion of the electrically conductive damper. Further, properties of the damper can be adjusted by varying an outer diameter of the reinforcing damper , or by selecting the resin to be employed as an adhesive.

Electrically conductive damper device for speaker

The invention relates to a speaker that can cool a voice coil efficiently. A bobbin that supports the voice coil is made from a material having good thermal transfer characteristics. Slits are formed in the bobbin to further promote heat emission from the voice coil.

Growing community of inventors

Tendo, Japan

Koji Matsumoto