# US 2014/0153750 A1 · Directional loudspeaker

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- Number: US 2014/0153750 A1
- Document ID: US20140153750A1
- Status: Published application
- Kind: A1
- Application number: 14/237,481
- Filed: 2012-08-28
- Published: 2014-06-05
- Earliest claimed: 2011-09-22
- Assignees: Panasonic Corporation
- Inventors: Fumiyasu Konno; Katsu Takeda
- Web page: https://patentgrep.com/patent/US20140153750A1

## CPC

- H04R 17/00: Piezoelectric transducers; Electrostrictive transducers (piezoelectric or electrostrictive elements in general H10N30/00; details of piezoelectric or electrostrictive motors, generators or positioners {H10N30/00})
- H04R 1/323: {for loudspeakers (H04R1/34 and H04R1/40 take precedence)}
- H04R 7/20: Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands
- H04R 1/403: {loud-speakers}
- H04R 2307/027: Diaphragms comprising metallic materials
- H04R 2307/204: Material aspects of the outer suspension of loudspeaker diaphragms
- H04R 2307/207: Shape aspects of the outer suspension of loudspeaker diaphragms
- H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K)

## Abstract

In a directional loudspeaker, an audible sound signal that is modulated with a carrier wave in the ultrasonic wave band is input to a piezoelectric element, and thereby a diaphragm having the piezoelectric element is vibrated and a sound wave is generated. In such a directional loudspeaker, the diaphragm is fixed to a fixed part via a plurality of beams disposed along the outer circumference of the diaphragm.

## Claims

### Claim 1

A directional loudspeaker comprising a vibrator including:
a diaphragm;
a piezoelectric element disposed on at least one of a top face and a bottom face of the diaphragm;
beams disposed in at least a part of an outer circumference of the diaphragm; and
a fixed part disposed outside the beams.

### Claim 2 (depends on 1)

The directional loudspeaker according to claim 1, wherein the diaphragm, the beams, and the fixed part are integrally formed.

### Claim 3 (depends on 1)

The directional loudspeaker according to claim 1, wherein a length of each of the beams is longer than a distance between the diaphragm and the fixed part.

### Claim 4 (depends on 1)

The directional loudspeaker according to claim 1, wherein, in the beams, a distance between portions of adjacent ones of the beams fixed to the diaphragm is substantially zero within a fixing accuracy of each of the beams to the diaphragm.

### Claim 5 (depends on 1)

The directional loudspeaker according to claim 1, wherein, in the beams, a distance between portions of adjacent ones of the beams fixed to the fixed part is substantially zero within a fixing accuracy of each of the beams to the fixed part.

### Claim 6 (depends on 1)

The directional loudspeaker according to claim 1, wherein protrusions are provided on the piezoelectric element so as to correspond to portions, to which the beams are fixed, of the diaphragm.

### Claim 7 (depends on 1)

The directional loudspeaker according to claim 1, wherein sets of combination of the diaphragm and the beams are formed on one substrate, and the substrate is the fixed part.