ELECTROSTATIC SPEAKER

• US 20140307897A1
• Filed: 11/29/2012
• Published: 10/16/2014
• Est. Priority Date: 11/30/2011
• Status: Active Grant

• Current Assignee: Yamaha Corporation
• Original Assignee: Yamaha Corporation
• Inventors: Takano, Yasuaki
• Granted Patent: US 9,148,730 B2
• Time in Patent Office: Days
• US Class Current: 381/190
• CPC Class Codes: H04R 19/01 characterised by the use of electrets
• CPC Class Codes: H04R 19/02 Loudspeakers H04R19/01 takes precedence
• CPC Class Codes: H04R 31/006 Interconnection of transducer parts of diaphragm and outer suspension by moulding H04R31/003
• CPC Class Codes: Y10T 29/49005 Acoustic transducer

Abstract

An electrostatic speaker includes: an oscillator; a first cushioning material layer and a second cushioning material layer; a first electrode and a second electrode; and a first cover layer and a second cover layer. In a second region inside a first region including an outer edge end of a laminated body including a plurality of layers including at least the first cover layer and the second cover layer, two adjacent layers of the plurality of layers included in the laminated body are fixed to each other, and strength at the outer edge end in the first region is higher than strength in the second region.

Claims

1. An electrostatic speaker comprising:

an oscillator formed of a sheet-like member and having conductivity and flexibility;

a first cushioning material layer and a second cushioning material layer, each formed of a sheet-like member and having insulation property, air permeability and elasticity;

a first electrode and a second electrode, each formed of a sheet-like member and having conductivity, air permeability and flexibility; and

a first cover layer and a second cover layer, each formed of a sheet-like member and having insulation property, wherein

the oscillator is disposed between the first cushioning material layer and the second cushioning material layer,

the first cushioning material layer is disposed between the oscillator and the first electrode, and the second cushioning material layer is disposed between the oscillator and the second electrode,

the first electrode is disposed between the first cushioning material layer and the first cover layer, and the second electrode is disposed between the second cushioning material layer and the second cover layer,

in a second region inside a first region including an outer edge end of a laminated body including a plurality of layers including at least the first cover layer and the second cover layer, two adjacent layers of the plurality of layers included in the laminated body are fixed to each other, and

strength at the outer edge end in the first region is higher than strength in the second region.

2. The electrostatic speaker according to claim 1, wherein,

in the second region, the two adjacent layers of the plurality of layers included in the laminated body are fixed to each other by heat sealing.

3. The electrostatic speaker according to claim 1, wherein,

in the outer edge end in the first region, the two adjacent layers of the plurality of layers included in the laminated body are not fixed.

4. The electrostatic speaker according to claim 1, further comprising

a reinforcing layer formed of a sheet-like member and fixed to at least one layer of the plurality of layers included in the laminated body, in at least part of the first region.

5. The electrostatic speaker according to claim 1, wherein

the first region includes the whole periphery of the outer edge end of the laminated body.

6. An electrostatic speaker producing method comprising:

providing an electrostatic speaker comprising;

an oscillator formed of a sheet-like member and having conductivity and flexibility;

a first cushioning material layer and a second cushioning material layer, each formed of a sheet-like member and having insulation property, air permeability and elasticity;

a first electrode and a second electrode, each formed of a sheet-like member and having conductivity, air permeability and flexibility; and

a first cover layer and a second cover layer, each formed of a sheet-like member and having insulation property, wherein

the oscillator is disposed between the first cushioning material layer and the second cushioning material layer,

the first cushioning material layer is disposed between the oscillator and the first electrode, and the second cushioning material layer is disposed between the oscillator and the second electrode, and

the first electrode is disposed between the first cushioning material layer and the first cover layer, and the second electrode is disposed between the second cushioning material layer and the second cover layer; and

,

in a second region inside a first region including an outer edge end of a laminated body including a plurality of layers including at least the first cover layer and the second cover layer, fixing two adjacent layers of the plurality of layers included in the laminated body to each other,

wherein strength at the outer edge end in the first region is higher than strength in the second region.