JPH062387Y2 - Speaker system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a speaker system capable of canceling electrical and acoustic asymmetric distortion and eliminating unnecessary vibration of a frame.

[Outline of device]

Two substantially identical speaker unit frames are fixed coaxially and in the same direction, the diaphragms are vibrated in opposite directions, and the acoustic output extracted from the front surface of one speaker unit and the rear surface of the other speaker unit is combined. It is a speaker system which is adapted to output the output.

[Conventional technology]

Conventionally, a speaker system as shown in FIG. 4 has been known in order to cancel electrical and acoustic asymmetric distortion. This is one in which two speaker units that are almost the same are installed in one cabinet in opposite directions to each other so that both diaphragms vibrate in the same direction, whereby the magnetic permeability of the magnetic body of the magnetic circuit is reduced. It is possible to cancel out the non-linearity of the current flowing in the voice coil due to the non-linearity and the non-linearity of the compliance non-linearity of the vibration system suspension.

Further, in order to remove the sound (vibration) generated from the portion other than the diaphragm of the speaker, as shown in FIG. 5, the frames of the two speaker units are fixed back to back,
It is known that drive forces of the same level are generated in opposite directions to cancel unnecessary vibration due to reaction.

However, there is no known one that eliminates unnecessary vibration of the frame at the same time as canceling the electrical and acoustic asymmetrical distortion.

[Problems to be solved by the invention]

An object of the present invention is to provide a speaker system capable of canceling out electrical and acoustic asymmetric distortion and eliminating unnecessary vibration of the frame.

[Means for solving problems]

In order to achieve the above-mentioned object, the speaker system of the present invention vibrates the diaphragms of two substantially identical speaker units whose frames are fixed coaxially and in the same direction in opposite directions to each other. The sound output extracted from the rear surface of the other speaker unit is combined and output.

[Action]

By doing so, the mechanical vibrations due to the reaction of the driving force of the two speaker units are canceled by each other,
Also, by combining the sound waves emitted from the two speaker units, their asymmetrical components are canceled each other.

〔Example〕

A first embodiment of the present invention will be described with reference to FIG.

The speaker units 1 and 1 ′ have substantially the same mechanical structure and electrical structure including a frame, and the two speaker units are coaxially and in the same direction coupled to each other by a coupling frame 4 and mounted on the cabinet 2. There is. The coupling frame 4 is made of a material and a structure having sufficient rigidity to transmit the reaction force of the speaker units 1 and 1'to the other side without attenuating or distorting the reaction force. In addition, a sufficiently large air vent hole is formed in the coupling frame 4 so as to guide the sound wave radiated from the front surface of the speaker unit 1 ′ into the space of the cabinet 2.

The internal space of the cabinet 2 is divided by the partition plate 5,
The acoustic outputs of the speaker units 1 and 1'can be taken out separately. Part of the partition plate 5,
It constitutes a part of the wall surface of the duct 6 for guiding the sound wave radiated from the rear surface of the speaker unit 1 ′ to the front surface of the cabinet 2. The duct 6 has a function as an acoustic filter that removes unnecessary high frequency components from the sound wave guided from the rear surface of the speaker unit 1 '. The sound wave guided from the rear surface of the speaker unit 1 ′ to the front surface of the cabinet 2 by the duct 6 is spatially combined with the sound wave radiated from the front surface of the speaker unit 1.

The speaker units 1 and 1'are electrically connected in opposite polarities, so that the two diaphragms vibrate in opposite directions.
Therefore, the reaction directions of the diaphragms acting on the magnetic circuits of the speaker units 1 and 1'are also opposite to each other,
Since the magnetic circuits of the speaker units 1 and 1'are coupled by the coupling frame, the reaction between the driving forces of the two is canceled by each other, and unnecessary vibration does not occur.

The electrical and acoustic distortion of the speaker is caused by the non-uniformity of the magnetic flux density distribution of the magnetic circuit within the maximum amplitude region of the voice coil, and the non-linearity of the vibration suspension suspension compliance. The non-linearity of the mechanical impedance caused by the above, and the distortion of the drive current due to the non-linearity of the impedance of the voice coil caused by the distortion of the magnetization curve of the magnetic material forming the magnetic circuit are considered.

Regarding these and, by spatially synthesizing the sound wave radiated from the front surface of the speaker unit 1 and the sound wave radiated from the rear surface of the speaker unit 1 ′, the asymmetrical components of the distortion components contained in each are canceled out. To be done. With respect to the above, by connecting the voice coils of the speaker units 1 and 1'in series with opposite polarities, the asymmetric component of the drive current is canceled.

Instead of connecting the voice coils of the speaker units 1 and 1'in series with opposite polarities, reverse the winding directions of the two, reverse the magnetization direction of the magnetic circuit, or simply reverse the wiring. Even if both are connected in parallel, it is not possible to cancel the current distortion, but it is possible to finally cancel the distortion component by spatially synthesizing the emitted sound waves.

Unnecessary high frequency components of the sound waves radiated from the rear surface of the speaker unit 1'are attenuated by passing through the low-pass filter by the duct 6, so that they interfere with the sound waves radiated from the front speaker unit 1 and have a characteristic. Will not be disturbed. Further, the sound source position in the middle frequency range is the position of the front speaker unit 1, which is superior in sound image localization as compared with the case where the same sound wave is emitted from two speakers. further,
In the low sound range, a large output is obtained by synthesizing the sound outputs of the two speaker units.

FIG. 2 shows a second embodiment.

The difference from the first embodiment is that the speaker units 1 and 1'are mounted vertically in a cabinet so that sound waves are radiated horizontally between the speaker units 1 and 1 ', which eliminates unnecessary vibrations of the frame and reduces electric power. The action of canceling the mechanical and acoustic asymmetrical distortion is exactly the same as that of the first embodiment.

FIG. 3 shows a third embodiment, in which the frame of the speaker units 1 and 1'is fixed by a connecting rod 7 instead of the connecting frame 4. The cabinet can be mounted in the second direction even in the horizontal direction as in the first embodiment.
Both are possible in the vertical direction as in the embodiment.

[Effect of device]

As explained above, the speaker system of this invention is
It has the following unique effects.

By canceling the unnecessary vibration due to the reaction of the driving force, it is possible to radiate a sound wave with no inherent coloring, which is less distorted only by the vibration of the diaphragm.

By inverting the vibration direction of the diaphragm of the second speaker unit and performing sound wave synthesis in the space, the asymmetrical distortion component of the sound wave emitted from each speaker unit is canceled and a low distortion sound output is obtained.

The sound image localization is superior to the case where the same sound wave is emitted from two speakers.

A large output can be obtained because the acoustic outputs of the two speaker units are combined.

[Brief description of drawings]

FIG. 1 ... Longitudinal sectional view of a first embodiment of the present invention FIG. 2 ... Longitudinal sectional view of a second embodiment FIG. 3 ... Longitudinal sectional view showing a connected state of a speaker unit of a third embodiment FIG. Longitudinal sectional view of conventional device Fig. 5 ... Vertical sectional view of conventional device 1, 1 '... Speaker unit 2 ... Cabinet 3 ... Magnetic circuit 4 ... Coupling frame 5 ... Partition plate 6 ... Duct, 7 ... Coupling rod

Front page continuation (72) Inventor Takashi Oyaba 42610 Hanazono, Tokorozawa, Saitama Pioneer Co., Ltd. Tokorozawa factory (56) Reference JP-A-61-167299 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. Acoustics taken out from the front surface of one speaker unit and the rear surface of the other speaker unit by vibrating the diaphragms of two substantially identical speaker units having coaxially fixed frames in the same direction in opposite directions. A speaker system characterized in that outputs are combined and output.