Panasonic Intellectual Property Management Co., Ltd.

Panasonic Corporation

Sawako Kano

Toshiyuki Matsumura

Shuji Saiki

Mitsukazu Kuze

Atsushi Sakaguchi

Akiko Fujise

Koji Sano

Takafumi Yuasa

A speaker system includes a speaker cabinet that has an opening, a first speaker including a first diaphragm, and at least one acoustic tube opened at both ends. When an amplitude of vibration of the first diaphragm vibrated by applying a correction AC signal together with the first AC signal to the first speaker is equalized to the amplitude of vibration of the second diaphragm, a sound pressure reproduced by vibration of the first diaphragm is equal to or lower than a sound pressure reproduced by vibration of the second diaphragm of the second speaker. This is accomplished by applying a third AC signal having a frequency equal to or higher than a minimum resonance frequency of the closed type cabinet determined by the internal volume of the closed type cabinet and the caliber of the second speaker is applied to the second speaker.

Speaker system

An earphone includes: a loudspeaker unit; a sound conductive tube which is connected to a front surface having a diaphragm included in the loudspeaker unit, and has a hole through which a sound generated from the loudspeaker unit is emitted; a housing which is connected to a back surface of the loudspeaker unit so that a space is formed between the housing and the back surface of the loudspeaker unit, and has a first air hole connecting the space to external air; a first braking part which closes a sound hole of the loudspeaker unit; and a second braking part which closes the first air hole.

Earphone

A loudspeaker is provided which includes: a magnetic circuit including a magnet having at least one hole, a plate fixed to one of a pair of polar surfaces of the magnet, and a box-shaped yoke having an inner bottom surface fixed to the other polar surface of the magnet; a voice coil vertically vibratably provided in a magnetic gap formed by the plate and the yoke; a diaphragm having a peripheral edge connected to an upper end of the voice coil; and a magnetic fluid filled in at least one of a gap between the voice coil and the plate and a gap between the voice coil and the yoke. The loudspeaker includes at least one means for uniformly distributing the magnetic fluid.

Loudspeaker and equipment including the same

A speakerincludes: a plurality of piezoelectric diaphragmsandeach including a substrate and a piezoelectric element provided on at least one surface of the substrate; one or a plurality of connecting membersconnecting the plurality of piezoelectric diaphragmsandto each other such that the plurality of piezoelectric diaphragmsandaligned from the piezoelectric diaphragmlocated at a frontmost side of the speaker, in a thickness direction of the piezoelectric diaphragm, and the piezoelectric diaphragmsandadjacent to each other face each other at an interval; a support membersupporting the back-side diaphragmthat is a piezoelectric diaphragm at a backmost side of the speaker. The plurality of piezoelectric diaphragmsandinclude two piezoelectric diaphragmsandhaving stiffnesses different from each other.

Speaker

A loudspeaker includes: a frame; a yoke fixed to the frame; a magnet fixed to the yoke; a plate fixed to an upper surface of the magnet which is opposite to a surface of the magnet which is fixed to the yoke; a vibratable voice coil arranged in a first magnetic gap formed between the yoke and the plate; a diaphragm having an outer-edge portion joined to the voice coil; and a support member supporting the diaphragm in a vibratable manner, and composed of edges, one end of each edge being fixed to the frame. The plate is composed of: a flat-plate part fixed to the upper surface of the magnet, and having, at an upper surface thereof, a planar portion extending from the outer-edge portion up to a predetermined distance; and a protruding part disposed on the flat-plate part excluding the planar portion, and protruding toward the diaphragm.

Loudspeaker, inner-ear headphone including loudspeaker, and hearing aid including loudspeaker

A piezoelectric speaker includes: a diaphragm which includes a substrate and a plurality of piezoelectric elements arranged on the substrate; and a frame for supporting the substrate at an outer peripheral portion thereof. The plural piezoelectric elements include first piezoelectric elements each having a first number of layers, and second piezoelectric elements each having a second number of layers, the first number of layers being larger than the second number of layers. Moreover, the second piezoelectric elements may be arranged farther from the center of the substrate than the first piezoelectric elements.

Piezoelectric speaker

A loudspeaker system comprises a cabinet, a speaker unit, a package body, a filler gas, and an absorbent. The speaker unit is mounted in the cabinet. At least one package body is disposed in a vacant space inside of the cabinet and is structured by a bag body for sealing materials thereinto from outside thereof. A predetermined amount of the filler gas is sealed into the package body. A predetermined amount of the absorbent is sealed into the package body and physically absorbs the filler gas.

Loudspeaker system

An electrodynamic electroacoustic transducer comprises: a first magnetic pole; a second magnetic pole that forms a magnetic gap between itself and the first magnetic pole and is arranged in a space excluding spaces in upper and lower face directions of the first magnetic pole; a yoke; a diaphragm; and a voice coil. The yoke magnetically couples one magnetic pole face of the first magnetic pole with one magnetic pole face of the second magnetic pole so as to support them. The diaphragm is arranged in a space in an upper face direction of the first magnetic pole and in a space in a lower face direction of the second magnetic pole, while its outer periphery is supported by the yoke. The voice coil is arranged in the magnetic gap and adhered to the diaphragm. At least one of the first magnetic pole part and the second magnetic pole part includes a magnet.

Electrodynamic electroacoustic transducer and electronic device

A speaker device includes a cabinet, a speaker unit, a port, a cartridge, and an adsorbent material. The adsorbent material is disposed in the interior of the cartridge. The cartridge is a container removable from the cabinet. When the adsorbent material is deteriorated, the cartridge is replaced or the adsorbent material is reactivated, thereby making it possible to maintain, over a long period of time, the effect of physical adsorption provided by the adsorbent material.

Speaker device

A speaker system according to the present invention comprises a cabinet (), a speaker unit (), a first parting board (), a drone cone (), an adsorption member (), a second parting board (), a backboard (), a variable mechanism (), and a port (). A sound pressure generated by the speaker unit () causes a pressure variation in a second chamber (R) via the drone cone (). The adsorption member () with an effect of physical adsorption is operable to suppress the pressure variation. Furthermore, by displacing the diaphragm (), the variable mechanism () is operable to reduce a pressure variation of a direct current component, which is caused by variations in ambient temperature or atmospheric pressure of the speaker system.

A loudspeaker unit () of a loudspeaker system () is fitted to a cabinet (). An absorbent () is disposed in a hollow chamber (R) inside the cabinet () and absorbs a gas inside the hollow chamber (R). A phase inverting mechanism () inverts the phase by resonating with a sound of a specific frequency radiated from the loudspeaker unit () into the hollow chamber (R) and radiates this sound to outside. The watertight means of the phase inverting mechanism () prevents invasion of moisture into inside the hollow chamber (R) from outside the cabinet () through the phase inverting mechanism ().

Growing community of inventors

Hyogo, Japan

Sawako Kano