# US 12,225,342 B2 · Coaxial speaker horn, and coaxial speaker

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- Number: US 12,225,342 B2
- Document ID: US12225342B2
- Status: Granted
- Kind: B2
- Application number: 17/971,731
- Filed: 2022-10-24
- Published: 2023-04-27
- Granted: 2025-02-11
- Earliest claimed: 2021-10-26
- Assignees: Yamaha Corporation
- Applicants: Yamaha Corporation
- Inventors: Katsutoki Hanayama; Hiroyuki Shiojima; Bahari Satriyo
- Web page: https://patentgrep.com/patent/US12225342B2

## CPC

- H04R 1/24: Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
- H04R 1/2803: {for loudspeaker transducers}
- H04R 1/30: Combinations of transducers with horns, e.g. with mechanical matching means {, i.e. front-loaded horns}(horns in general G10K; {transducer enclosures or mountings using a back-loaded horn H04R1/2861; application of horns as guiding means to obtain a predetermined directivity characteristic H04R1/345})
- H04R 1/345: {for loudspeakers}
- 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 coaxial speaker horn constitutes a coaxial speaker together with a tweeter and a woofer. The coaxial speaker horn includes a plurality of through holes arranged around an entire circumference of the horn.

## Claims

### Claim 1

A coaxial speaker horn for constituting a coaxial speaker together with a tweeter and a woofer, comprising:
a plurality of through holes arranged an entire circumference of the horn,
wherein the plurality of through holes are arranged in radial directions of the horn when viewed from an axial direction of the horn, and
wherein the plurality of through holes comprise a through hole located on a radially inner side and a through hole located on a radially outer side, and an opening area of the through hole located on the radially inner side is smaller than an opening area of the through hole located on the radially outer side.

### Claim 2 (depends on 1)

The coaxial speaker horn according to claim 1, wherein a total opening area of the plurality of through holes when viewed in the axial direction of the horn is 35% or more of an entire area of the horn when viewed in the axial direction.

### Claim 3 (depends on 1)

The coaxial speaker horn according to claim 1, wherein an upper limit value of an opening area of each of the plurality of through holes is set so that the horn maintains a function thereof to increase a sound pressure of a sound at a predetermined frequency output from the tweeter.

### Claim 4 (depends on 1)

The coaxial speaker horn according to claim 1, wherein a total opening area of the plurality of through holes when viewed in the axial direction of the horn is 60% or less of an entire area of the horn when viewed in the axial direction.

### Claim 5 (depends on 1)

The coaxial speaker horn according to claim 1, wherein the plurality of through holes are provided only in a region overlapping with the woofer when viewed from the axial direction of the horn.

### Claim 6

A coaxial speaker comprising:
a horn comprising a plurality of through holes arranged around an entire circumference of the horn;
a tweeter attached to a central portion of the horn when viewed from an axial direction of the horn; and
a woofer arranged coaxially with the tweeter, the woofer being arranged on a rear side of the tweeter, wherein
the plurality of through holes are arranged in radial directions of the horn when viewed from an axial direction of the horn, and
the plurality of through holes comprise a through hole located on a radially inner side and a through hole located on a radially outer side, and an opening area of the through hole located on the radially inner side is smaller than an opening area of the through hole located on the radially outer side.