JP5719958B1 - Speaker unit - Google Patents

Abstract

Provided is a speaker unit capable of canceling the reaction of a diaphragm, eliminating the problem of back pressure, and faithfully reproducing the original sound of a media resource. SOLUTION: A box-shaped enclosure 3 whose six surfaces are sealed, and two drivers 2a and 2b arranged in parallel along the wall inside and outside the wall of one surface of the enclosure 3 are provided. This is a speaker unit 1. Each driver 2a, 2b has a frame 5 that surrounds the periphery of the diaphragm 4 and in which a plurality of openings 5a are formed. Between the inner and outer drivers 2a and 2b, there is provided a pipe 7 that penetrates the wall and communicates between the frame 5 opening 5a at the shortest distance, and an opening other than the opening 5a of the frame 5 communicated by the pipe 7 is provided. A closed space communicated by a pipe 7 is formed inside the frame 5 of the inner and outer drivers 2a and 2b by being covered with the cover member 6. [Selection] Figure 1

Description

  The present invention relates to a speaker unit that can faithfully reproduce an original sound from a media resource.

In the conventional enclosure type (or cabinet type), the problem of the back pressure of the driver's diaphragm is difficult to avoid. In order to avoid this, there was only a solution called a flat baffle plate. Although the flat baffle plate is an ideal speaker, a huge baffle plate is required, which has a great disadvantage in practicality.
Thus, a tandem drive type speaker 10 as shown in FIG. 2 was conceived. This is of the double enclosure type having another enclosure 11b and driver 12b behind one enclosure 11a and driver 12a. This has already been put into practical use at Eggleston. According to this, since the diaphragm 13b of the rear driver 12b is also moved in the same phase at the same time as the front diaphragm 13a is moved forward, the pressure of the front speaker box is always the same as the external pressure. The problem of the back pressure of the diaphragm was solved.

  However, this system has not produced the desired effect. Because the moving speed of the air is slow and the air can be easily compressed or extended, the front diaphragm 13a has already started to move when the air sent out by the rear driver 12b reaches behind the front driver 12a. As a result, the fundamental back pressure has not been resolved. As a result, electrical energy is not converted into air energy, which in turn becomes energy that moves the speaker unit and thus the entire speaker system, leaving a problem in terms of the accuracy of the reproduced sound. It was.

Japanese Patent Laid-Open No. 2-100500 JP 2007-235727 A

  It is an object of the present invention to solve the above problems. That is, the problem is to cancel the reaction of the diaphragm and eliminate the problem of the back pressure of the speaker unit.

  Therefore, a speaker system according to the present invention includes a box-shaped enclosure having six surfaces sealed, and two parallelly arranged along the wall inside and outside the wall on one surface of the enclosure. Each driver has a frame that surrounds the diaphragm and has a plurality of openings formed therein, and is a pipe that passes through the wall and communicates between the frame openings of the inner and outer drivers at the shortest distance. And a closed space communicated by the pipe is formed inside the frame of the inner and outer drivers by closing an opening other than the opening of the frame communicated by the pipe, and the outer driver transmits an audio signal from the media resource. The driver inside the enclosure outputs an antiphase signal of the audio signal from the media resource. It was configured to.

  According to the speaker unit of the present invention, the two drivers are adjacent to each other at the shortest distance, and then the frames are joined to each other by a pipe that communicates between the frame openings of the inner and outer drivers at the shortest distance to form a sealed space. As a result, the space connecting the two drivers becomes very small, and the two drivers operate in exactly the same phase under a close movement relationship. As a result, the Fo of the driver coupled by the pipe is improved, and an open and clear reproduction sound can be obtained.

The longitudinal cross-sectional view which shows the speaker unit based on the Example of this invention. The longitudinal cross-sectional view which shows the speaker unit concerning a prior art.

  FIG. 1 shows a speaker unit 1 according to an embodiment of the present invention, with a box-shaped enclosure 3 sealed on six sides and a wall (top plate) on the upper surface of the enclosure 3 being sandwiched. Two drivers 2a and 2b are arranged inside and outside in parallel along the wall.

  The inner and outer drivers 2a and 2b each have a frame 5 that surrounds the periphery of the diaphragm 4 and has a plurality of openings 5a. The inner and outer drivers 2a and 2b include a pipe 7 that passes through the wall and communicates between the frame openings 5a and 5a of the inner and outer drivers 2a and 2b at the shortest distance. Openings other than the opening 5 a of the frame communicated by the pipe 7 are closed by the cover member 6.

  By closing the opening 5a of the frame 5 other than the opening through which the pipe 7 communicates with the cover member 6, a sealed space communicated by the pipe 7 is formed between the diaphragm 4 and the frame 5 in the inner and outer drivers. ing. In this embodiment, the material of the pipe 7 is made of plastic and is in close contact with the driver with an epoxy adhesive, but other materials can be used as long as they are highly airtight and difficult to deform.

  The driver 2a arranged outside the enclosure 3 is configured to faithfully reproduce an audio signal recorded on a media resource such as a CD (indicated by an arrow in the outward direction in the figure), and inside the enclosure 3 The driver 2b arranged in (1) is configured to be output via a sound generation unit having an opposite phase to that of the driver 2b (indicated by an arrow inward in the drawing).

  In the speaker unit 1 configured as described above, the sound wave vibration generated on the back side of the diaphragm section of the driver 2a is canceled by the sound wave vibration in the opposite phase generated from the driver 2b. That is, the sound and air pressure in the sealed space communicated by the pipe 7 cancel each other and disappear. Accordingly, the audio signal recorded in the media resource is faithfully reproduced from the driver 2a without being adversely affected by the reaction of the diaphragm 4 (diaphragm) and the back pressure.

  The speaker unit according to the present invention can faithfully reproduce an audio signal recorded in a media resource and can be widely used as an acoustic device.

  1: speaker unit, 2a, 2b: driver, 3: enclosure, 4: diaphragm, 5: frame, 5a: opening, 6: cover member.

Claims (1)

A box-shaped enclosure with six sides sealed;
Comprising two drivers arranged in parallel along the wall inside and outside the wall on one side of the enclosure,
Each driver has a frame surrounding the diaphragm and having a plurality of openings formed therein.
A pipe that penetrates the wall and communicates between the frame openings of the inner and outer drivers at the shortest distance and closes an opening other than the opening of the frame communicated by the pipe to the inside of the frame of the inner and outer drivers. Forming a sealed space communicated by the pipe;
The outer driver outputs the audio signal from the media resource,
A driver inside the enclosure outputs an anti-phase signal of an audio signal from the media resource;
A speaker unit characterized by that.

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