# US 10,484,787 B2 · Loudspeaker apparatus

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- Number: US 10,484,787 B2
- Document ID: US10484787B2
- Status: Granted
- Kind: B2
- Application number: 15/943,841
- Filed: 2018-04-03
- Published: 2018-10-04
- Granted: 2019-11-19
- Earliest claimed: 2017-04-04
- Assignees: Zorzo Co., Ltd.
- Applicants: Zorzo Co., Ltd.
- Inventors: Teppei Yamada
- Web page: https://patentgrep.com/patent/US10484787B2

## CPC

- H04R 1/2819: {for loudspeaker transducers}
- H04R 1/227: {using transducers reproducing the same frequency band}
- H04R 1/2803: {for loudspeaker transducers}
- H04R 1/2834: {for loudspeaker transducers}
- H04R 1/2888: {for loudspeaker transducers}
- H04R 2400/11: Aspects regarding the frame of loudspeaker transducers
- 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

A loudspeaker apparatus includes at least three speaker units, and a space defining part defining at least two sealed spaces. Each of the speaker units has a diaphragm having two surfaces, and a driver unit for inputting an electrical signal and driving the diaphragm. Each of the sealed spaces has at least two boundary diaphragms. Each of the boundary diaphragms is one of the diaphragms, disposed so that a first one of the surfaces faces inside the sealed space and a second one of the surfaces faces outside the sealed space. When at least one of the boundary diaphragms is driven outward from the sealed space, at least one of the other boundary diaphragms is driven inward to the sealed space. The boundary diaphragms driven outward and the boundary diaphragms driven inward are the same in number, and thereby a volume of the sealed space is kept constant.

## Claims

### Claim 1

A loudspeaker apparatus, comprising:
at least three speaker units; and
a space defining part defining at least two sealed spaces, wherein
each of the speaker units has a diaphragm having two surfaces, and a driver unit for inputting an electrical signal and driving the diaphragm,
each driver unit inputs substantially the same electrical signal with substantially the same or opposite phases,
each of at least two of the sealed spaces has at least two boundary diaphragms,
each of the boundary diaphragms is one of the diaphragms, disposed so that a first one of the surfaces faces inside a sealed space and a second one of the surfaces faces outside the sealed space,
when at least one of the boundary diaphragms is driven outward from the sealed space, at least one of the other boundary diaphragms is driven inward to the sealed space, the boundary diaphragms driven outward and the boundary diaphragms driven inward are the same in number, and thereby a volume of the sealed space is kept constant, and
at least one of the boundary diaphragms is disposed at a boundary between two of the sealed spaces having volumes kept constant, one of its surfaces faces inside one of the two sealed spaces and a second one of its surfaces faces inside the other of the two sealed spaces.

### Claim 2 (depends on 1)

The loudspeaker apparatus of claim 1, wherein at least one of the sealed spaces has at least two of the boundary diaphragms arranged so that the surfaces facing outside the sealed space are oriented to substantially the same directions.

### Claim 3 (depends on 1)

The loudspeaker apparatus of claim 1, wherein at least one of the sealed spaces has at least two of the boundary diaphragms arranged on substantially the same planes.

### Claim 4 (depends on 1)

The loudspeaker apparatus of claim 1, wherein
at least two of the speaker units are exposed speaker units,
in each of the exposed speaker units, at least one of the surfaces of the diaphragm is exposed outside.

### Claim 5 (depends on 4)

The loudspeaker apparatus of claim 4, wherein
no distance between any two of the speaker units is larger than a distance between two of the exposed speaker units.

### Claim 6 (depends on 4)

The loudspeaker apparatus of claim 4, wherein
two of the exposed speaker units are disposed so that the exposed surfaces of the diaphragms are oriented to substantially opposite directions.

### Claim 7 (depends on 1)

The loudspeaker apparatus of claim 1, wherein
at least one of the speaker units is a sealed speaker unit,
in the sealed speaker unit, the two surfaces of the diaphragm face inside the same or different sealed spaces.

### Claim 8 (depends on 1)

The loudspeaker apparatus of claim 1, wherein
all of the diaphragms are arranged on substantially the same lines.

### Claim 9 (depends on 1)

The loudspeaker apparatus of claim 1, wherein
a number of the speaker units is an odd number.

### Claim 10 (depends on 1)

The loudspeaker apparatus of claim 1, wherein
a number of the speaker units is a product of two natural numbers larger than 1.

### Claim 11 (depends on 1)

The loudspeaker apparatus of claim 1, wherein
at least two of the speaker units forms at least one pair,
each of the pair includes two of the speaker units,
in each of the pair, the driver units are disposed back to back, and input the electrical signals with substantially the same phases, and thereby reaction forces created by movement of the two diaphragms are cancelled.