Speaker system with broad directivity

Abstract

A speaker system has a speaker unit with a vibration plate of a corn type, a horn and a diffuser. The horn is disposed such that a small-diameter opening thereof is positioned inward from a front opening of the vibration plate, and an outer surface of the horn is arranged along an inner surface of the vibration plate from the small-diameter opening to form a first acoustic path. The diffuser has a base portion, a front end portion and an outer peripheral surface extending therebetween, and is disposed such that the base portion is positioned inward from a front opening of the horn and opposed to the small-diameter opening of the horn. The diffuser has a specific shape such that the outer peripheral surface expands along an inner surface of the horn from the base portion to form a second acoustic path. The expanding outer peripheral surface of the diffuser is then narrowed toward the front end portion of the diffuser.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view showing a first embodiment of present invention.

FIG. 2 is a first sectional structure view showing an inner structure of the embodiment depicted in FIG. 1.

FIG. 3 is a second sectional structure view showing an inner structure of the embodiment depicted in FIG. 1.

FIG. 4 is an exploded structure view showing a cone type vibration plate, a second horn, a first horn and a diffuser.

FIG. 5 is a sectional structure view showing a second embodiment of present invention.

FIG. 6 is a sectional structure view showing a third embodiment of present invention.

FIGS. 7( a) and 7(b) are graphs showing features of a conventional cone type speaker with large diameter.

Claims

1. A speaker system with broad directivity using a speaker unit having a cone type vibration plate with a front opening, the speaker system comprising: a first horn; and a diffuser, wherein the first horn has a small-diameter opening and is disposed such that the small-diameter opening is positioned inward from the front opening of the cone type vibration plate and an outer surface of the first horn is arranged along an inner surface of the cone type vibration plate from the small-diameter opening to form a first acoustic path between the outer surface of the first horn and the inner surface of the cone type vibration plate, andwherein the diffuser has a base portion, a front end portion and an outer peripheral surface extending therebetween, and is disposed such that the base portion is positioned inward from a front opening of the first horn and opposed to the small-diameter opening of the first horn, and the diffuser has a shape such that the outer peripheral surface expands along an inner surface of the first horn from the base portion to form a second acoustic path between the expanding outer peripheral surface of the diffuser and the inner surface of the first horn and such that the expanding outer peripheral surface of the diffuser is then narrowed toward the front end portion of the diffuser.

2. The speaker system with broad directivity according to claim 1, further comprising a second horn that is located adjacent to the front opening of the cone type vibration plate and expands in an extending direction of the cone type vibration plate, and that is disposed such that an inner surface of the second horn is arranged along the outer surface of the first horn to form a gap between the inner surface of the second horn and the outer surface of the first horn for extending the first acoustic path.

3. The speaker system with broad directivity according to claim 1, further comprising a plurality of high frequency speakers which are accommodated in the outer peripheral surface of the diffuser which is obliquely cut around the front end of the diffuser such that the plurality of the high frequency speakers are arranged radially around a central axis of the diffuser.

4. The speaker system with broad directivity according to claim 1, wherein the diffuser has a hole at a central portion thereof which forms a third acoustic path.

5. A speaker system with broad directivity using a speaker unit having a vibration plate, the speaker system comprising: a first horn; a second horn; and a diffuser, wherein the second horn is disposed such that a small-diameter opening of the second horn is positioned at an opening of the speaker unit,wherein the first horn is disposed such that a small-diameter opening of the first horn is positioned inward from a front opening of the second horn and that an outer surface of the first horn extends along an inner surface of the second horn from the small-diameter opening of the first horn to form a first acoustic path between the outer surface of the first horn and the inner surface of the second horn, andwherein the diffuser has a base portion, a front end portion and an outer peripheral surface extending therebetween, and is disposed such that the base portion is positioned inward from a front opening of the first horn and opposed to a small-diameter opening of the first horn, and the diffuser has a shape such that the outer peripheral surface of the diffuser expands along an inner surface of the first horn from the base portion to form a second acoustic path between the expanding outer peripheral surface of the diffuser and the inner surface of the first horn and such that the expanding outer peripheral surface of the diffuser is then narrowed toward the front end portion of the diffuser.

6. The speaker system with broad directivity according to claim 5, further comprising a plurality of high frequency speakers which are accommodated in the outer peripheral surface of the diffuser which is obliquely cut around the front end of the diffuser such that the plurality of the high frequency speakers are arranged radially around a central axis of the diffuser.

7. The speaker system with broad directivity according to claim 5, wherein the diffuser has a hole at a central portion thereof which forms a third acoustic path.

8. The speaker system with broad directivity according to claim 5, wherein the speaker unit has the vibration plate of a non-cone type.