JP2010068063A - Speaker box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein it is necessary to further effectively muffle sound emitted from the back face of a speaker driver to the inside of a speaker box. <P>SOLUTION: This speaker box includes, in its internal space, an expansion part of which the cross-sectional area in a direction orthogonal to the vibration axis of a speaker driver is gradually decreased with distance from the back face of the speaker driver, and is set larger than that of a minimum part at which the cross-sectional area is minimized when getting across the minimum part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a speaker box in which a speaker driver is attached to a speaker box.

  Speaker boxes can be broadly divided into sealed and bass reflex types. A sealed speaker box that uses the output from the front of the speaker driver is generally superior in instantaneous response and phase characteristics of bass compared to any other system.

In the interior space of the speaker box, when there are walls facing each other in parallel, a standing wave is generated and the sound is emphasized by a specific frequency, so that the frequency characteristics do not become flat. Therefore, as shown in Patent Document 1, unnecessary resonance in the enclosure is absorbed by inserting a sound absorbing material inside the speaker box.
JP 58-29292 A

  However, when a sound absorbing material is used, there is a demerit that sound pressure is reduced from the speaker.

  In order to solve the above-described problems, the present invention has an internal space of a speaker box that gradually decreases in cross-sectional area in a direction perpendicular to the vibration axis of the speaker driver as the distance from the back of the speaker driver increases. An inflatable portion having a cross-sectional area larger than the minimum portion when the narrowest minimum portion is exceeded is provided.

  According to the present invention, sound propagation from the back side of the speaker driver can be effectively absorbed and diffused.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings.

  Examples of the present invention will be described below. 1 and 2 are a top view and a front view of the apparatus of the present invention, respectively. A speaker driver 3 is attached to the sealed speaker box 2. Two partition walls 4 and 5 are provided inside the speaker box 2 so that the cross-sectional area in a direction perpendicular to the vibration axis of the speaker driver gradually decreases from the back of the speaker driver 3 toward the back of the speaker box 2. It is a simple shape.

  When the distance between the two partition walls 4 and 5 exceeds the narrowest minimum portion 6, the distance between the two partition walls 4 and 5 turns wide. The relative surface 7 facing the back surface of the speaker driver 3 is a curved surface, and the sound emitted from the back surface of the speaker driver 3 is diffused by being reflected by the curved surface, and uniformly toward a specific direction. It is configured not to be reflected.

  The sound wave exceeding the minimum portion 6 is divided into right and left and enters the two expansion spaces 8 and 9 on the back side of the partition walls 4 and 5. The two expansion portions 8 and 9 can provide a volume required when the speaker driver 3 is used as a sealed enclosure.

  In the above configuration, the speaker box is formed so that the cross-sectional area gradually becomes narrower, passes through the minimal portion 6 and then turns around to increase the cross-sectional area, and thus is the same as a general chamber configuration. That is, since the sound wave narrowed by the reduction in the cross-sectional area is emitted from the minimal part 6 to the expansion parts 8 and 9, an effect of attenuating the sound wave is obtained.

  In Example 1 described above, the portion beyond the minimum portion 6 is turned around to the back side of the partition walls 4 and 5, and as a result, the speaker box 2 is folded. Without being limited to the above, it is also possible to form the front and back of the minimal portion 6 in a straight line.

  3 and 4 are a top view and a front view of the speaker 10 in the second embodiment. The space on the back side of the speaker driver 3 gradually decreases as the distance from the back surface of the speaker driver 3 increases. When the space exceeds the minimum portion 16, the cross-sectional area in the direction orthogonal to the vibration axis of the speaker driver 3 increases. The speaker box 12 is formed so that the expansion part 18 is formed.

  The portion of the speaker box 12 farthest from the speaker driver 3 is a curved surface 17 as in the first embodiment, and the sound emitted from the back surface of the speaker driver 3 is reflected by this curved surface and diffused. However, it is configured not to be uniformly reflected toward a specific direction.

  As in the first embodiment, since the so-called chamber is constituted by the minimal portion 16 and the expanding portion 18, the sound pressure from the back surface of the speaker driver 3 can be effectively silenced.

  The present invention is not limited to the above-described embodiments, and can take various measures. For example, the sound from the back surface of the speaker driver 3 passes through the minimal portion 16 and then is emitted to the inflating portion, but the shape of the inflating space can take any shape.

  As described above, by providing the minimum portion and the expansion portion in the speaker box, it is possible to effectively mute the sound emitted from the speaker driver into the speaker box.

The top view of the speaker 1. FIG. The front view of the speaker 1. FIG. FIG. 3 is a top view of the speaker 10. The front view of the speaker 10. FIG.

Explanation of symbols

1, 10 Speaker 3 Speaker driver 4, 5 Bulkhead 6, 16 Minimal part 7, 17 Curved surface 8, 9, 18 Expansion space

Claims (2)

In the speaker box to which the speaker driver is attached,
In the internal space of the speaker box, the cross-sectional area in a direction perpendicular to the vibration axis of the speaker driver decreases as the distance from the back surface of the speaker driver decreases, and the cross-sectional area increases when the cross-sectional area exceeds the narrowest minimum portion. A speaker box comprising an inflating part that is larger than the minimum part.   The speaker box according to claim 1, wherein a surface of the speaker box that faces the back surface of the speaker driver is a curved surface.