WO2014041605A1

WO2014041605A1 - Speaker system

Info

Publication number: WO2014041605A1
Application number: PCT/JP2012/073208
Authority: WO
Inventors: 健太藤本; 伸一早坂; 祥隆十二町
Original assignee: パイオニア株式会社; 東北パイオニア株式会社
Priority date: 2012-09-11
Filing date: 2012-09-11
Publication date: 2014-03-20

Abstract

[Problem] To provide an enclosed speaker system that can reduce the internal/external pressure difference of a speaker cabinet without a complicated operation and without causing a decrease in reproduced sound quality or an increase in cost. [Solution] A speaker system having a speaker device and an enclosed speaker cabinet that affixes and houses the speaker device, wherein the speaker system is provided, as a portion of the wall partitioning the inside and outside of the speaker cabinet, with a pressure adjustment section comprising an elastic member at which a discontinuity is formed that penetrates to the inside and outside.

Description

Speaker system

The present invention relates to a speaker system that can reduce the pressure difference when a pressure difference occurs inside and outside the speaker cabinet.

In the speaker system, the speaker body is fixed and housed in the opening of the speaker cabinet, the inside of the speaker cabinet is sealed, and the sound quality is maintained by this sealing.

However, when it is installed in a place where the temperature changes greatly, for example, in an automobile, the air inside the speaker cabinet expands due to high temperature (for example, about 85 ° C.), and a pressure difference between the inside and outside of the speaker cabinet is generated. Due to the pressure difference, the position of the diaphragm of the speaker is shifted from the original initial position, or the diaphragm is deformed. As a result, there arises a problem that the original original sound reproduction performance is not exhibited.

To solve this problem, a pressure adjustment hole that penetrates the speaker cabinet is provided, a rotor is provided in the pressure adjustment hole, and the pressure adjustment hole is opened by rotating the rotor so that the pressure difference between the inside and outside of the speaker cabinet is increased. A technique has been proposed in which the pressure adjustment hole is sealed by eliminating the problem and then further rotating the rotor (Patent Document 1).

No. 7-37431

However, in the above prior art, it is necessary to detect whether or not there is a pressure difference between the inside and outside of the speaker cabinet, or to rotate the rotor unconditionally. In the former case, the pressure inside and outside the speaker cabinet must be detected. The difference detection means is required, which causes an increase in cost. In the latter case, the operation is troublesome, or when the rotation of the rotor is automated, the increase in cost is also caused.

Therefore, the present invention improves the above-described conventional problems, that is, a speaker capable of reducing the pressure difference between the inside and outside of the speaker cabinet without increasing the cost and lowering the reproduction sound quality and without complicated operation. The problem is to provide a system.

In order to solve the above problems, a speaker system of the present invention is a speaker system having a speaker device and a sealed speaker cabinet for fixing and storing the speaker device, as described in claim 1, As a part of the wall separating the inside and the outside in the cabinet, a pressure adjusting unit made of an elastic member formed with a slit penetrating the inside and outside is provided.

FIG. 1 is a model diagram showing an example A of a speaker system according to the present invention. FIG. 1A is a model cross-sectional view. FIG. 1B is a model diagram showing an elastic member 3. FIG. 1C to FIG. 1E are model diagrams showing other examples 31, 32, and 33 of elastic members. FIG. 2 is a graph showing the amplitude of the speaker diaphragm in the speaker systems of the example and the comparative example. FIGS. 3A to 3E are model diagrams showing another example of the speaker system according to the present invention. FIG. 4 is a model sectional view showing another example of the speaker system according to the present invention (comprising a thin speaker device described in Japanese Patent No. 4457165 of single-sided driving). FIG. 5 is a model cross-sectional view showing another example (with a thin speaker device described in Japanese Patent No. 5037697 of double-sided drive) D according to the present invention.

A speaker system according to an embodiment of the present invention will be described. A speaker system according to an embodiment of the present invention is a speaker system including a speaker device and a sealed speaker cabinet that fixes the speaker device, and is a wall that separates the inside and the outside of the sealed speaker cabinet. The portion has a configuration including a pressure adjusting portion made of an elastic member in which a cut line penetrating the inside and the outside is formed.

With this configuration, for example, when the temperature around the speaker system becomes high and the internal pressure of the speaker system becomes higher than the external pressure, the elastic member constituted by the elastic member is deformed. And, by this deformation, a part of the air inside is released to the outside through the opening connecting the inside and outside of the speaker cabinet formed in the cut portion, so the pressure difference inside and outside the speaker cabinet is eliminated, The deformation of the diaphragm is prevented, and the position of the diaphragm of the speaker is returned to a predetermined position, so that the original original sound reproduction performance can be exhibited.

Further, when the pressure difference between the inside and outside of the speaker cabinet is eliminated by the release of excessive air inside the speaker cabinet, the opening formed in the cut is closed by the restoring force of the elastic member constituting the pressure adjusting unit. At this time, the airtightness required for the airtight speaker system is restored, and the original original sound reproduction performance as the airtight speaker system is ensured.

Further, when the elastic member is made of natural rubber or synthetic rubber, it can be a pressure adjusting portion sensitive to a pressure difference inside and outside the speaker cabinet.

Further, when the elastic member is a plate-like elastic member, it can be a pressure adjusting portion that is further sensitive to a pressure difference between inside and outside the speaker cabinet.

In addition, when the cut is formed in a cross shape, the pressure adjustment unit can be sensitive to a pressure difference between the inside and outside of the speaker cabinet.

In addition, when the speaker system is a closed speaker system for low sounds, the original sound reproduction performance can be more effectively secured.

The speaker system includes a speaker device, and the speaker device converts a vibration direction of vibration by the driving member that converts an audio signal into vibration, and a vibration direction different from the vibration direction. When the vibration direction conversion unit and the vibration plate connected to the vibration direction conversion unit directly or through another member are provided, it can be made thinner than a conventional speaker device and emits a larger reproduced sound. can do.

Further, the speaker system has a speaker device, and the speaker device converts a vibration direction of the vibration by the driving member that converts an audio signal into vibration, and a vibration direction different from the vibration direction. When having a vibration direction conversion part to be converted, and a first diaphragm and a second diaphragm that are connected to the vibration direction conversion part directly or via another member and are opposed to each other, It can be made thinner than the speaker device and can emit a larger reproduced sound.

Further, if the vibration direction conversion unit is a vibration direction conversion unit that brings the first diaphragm and the second diaphragm close to or away from each other, the phase of the sound radiated from these diaphragms is equal, The speaker device except the plate hardly vibrates.

In addition, when the pressure adjusting unit is provided on the side opposite to the sound radiation direction of the sealed speaker system, even if sound in the speaker cabinet leaks from the pressure adjusting unit, the influence is minimized. can do.

Further, the closed speaker cabinet further includes a drone cone, thereby improving the reproduction efficiency of bass.

By providing another cabinet different from the sealed speaker cabinet on the sound radiation direction side of the speaker device, a speaker system having particularly excellent bass reproduction characteristics can be obtained.

A speaker system A according to a first embodiment of the present invention will be described with reference to FIG.

As shown in the cross-sectional view of FIG. 1A, in the speaker system A, the speaker device 1 (in this example, a dynamic speaker device) is fixed to an opening for installing the speaker device of a substantially rectangular speaker cabinet 2. And stored. A through-hole 2a penetrating from the inner surface to the outer surface of the speaker cabinet 2 is provided on the surface opposite to the speaker device 1 installation surface of the speaker cabinet 2, that is, on the opposite side to the sound emission direction of the speaker system A. ing. The through hole 2a has a narrow thin portion 2a1 that opens to the inner wall of the speaker cabinet 2, and an outer wall of the speaker cabinet 2 that is connected to the thin portion 2a1 through the step 2a2 at the outer end of the speaker cabinet 2 of the thin portion 2a1. A thick large-diameter portion 2a3 is formed, and a plate-like elastic member 3 is fixed to the step portion 2a2.

Thus, in the speaker system A, a part of the wall separating the inside and the outside of the speaker cabinet 2 is constituted by the plate-like elastic member 3.

This plate-like elastic member 3 is formed with a cross-shaped cut 3a that penetrates the surface of the elastic member inside the speaker cabinet 2 and the surface outside.

The cut 3a may be provided by a method such as providing the elastic member 3 with a sharp blade, or by forming a thin cross-shaped insertion die in the mold when the elastic member 3 is formed. However, at this time, the plate-like elastic member 3 is provided so as to be opened and air can be circulated only when the plate-like elastic member 3 is deformed by the internal and external pressure differences.

The elastic member 3 having such a cross-shaped cut 3a is deformed by the pressure difference when the pressure difference between the inside and outside of the speaker cabinet 2 is large, and an opening is formed in the cross-shaped cut 3a. The pressure adjusting unit reduces or eliminates the pressure difference between the inside and outside of the speaker cabinet 2 by moving the air inside the speaker cabinet 2 to the outside through the formed opening or moving the air outside the speaker cabinet 2 to the inside. Is configured.

By using the plate-like elastic member 3 as described above, it is possible to provide a pressure adjusting unit that is sensitive to the pressure difference in the speaker cabinet 2, and further, by using the cross-shaped cut 3a, the pressure adjustment is possible. Can enhance the effect. In addition, the cut | interruption 3a can be provided from one piece to multiple pieces as needed, and the shape is not restricted to a cross shape. Moreover, the cut | interruption should just penetrate the other surface from one surface of the elastic member.

FIG. 1 (c) shows another example 31 of the pressure adjusting unit 4. In this example, two cuts 31 ′ are provided in the flat elastic member 3 in parallel to each other. FIGS. 1D and 1E show examples 32 and 33 of dome-shaped elastic members. In the example 32 of the elastic member, the dome-shaped concave portion is installed inside the speaker cabinet, and in the example 33 of the elastic member, the dome-shaped convex portion is installed inside the speaker cabinet. Further, there are provided cuts 32a and 32b penetrating the inner and outer surfaces of the speaker cabinet.

Examples of the material constituting the elastic member include natural rubber, synthetic rubber, and various soft resins (for example, soft vinyl chloride resin, polyolefin, etc.). The material includes the size and thickness of the elastic member, and the size of the cut. The selection is made according to the required operating condition of the pressure adjusting unit.

In this example, the pressure adjusting unit is provided on the side opposite to the sound emission direction of the speaker system. However, by configuring in this way, the influence of the sound leaking from the speaker cabinet 2 through the pressure adjusting unit is affected. It can be kept to a minimum and good sound reproduction can be performed.

FIG. 2 shows a graph comparing the target amplitude of the vibration of the speaker device by the speaker system A of FIG. 1 with the target amplitude of the vibration of another speaker device.

In the pressure adjusting unit 4 of the speaker system A, the through hole 2a has a small diameter portion of 0.7 mm (round hole), and the large diameter portion is a square hole of 12 mm × 12 mm, with a step portion of 10 mm × 10 mm and a thickness of 1 mm. An elastic member made of synthetic rubber was fixed with an adhesive. At the center of the elastic member, two slits having a length of 3 mm and penetrating to the back surface side were formed in a cross shape using a blade from the surface.

The result of the amplitude of the speaker system A is shown in FIG. 2 as “With a break”. In the speaker system A and the sealed speaker system (same as the speaker system A except that the through hole and the pressure adjusting unit are not installed). It showed with a result ("sealed" in FIG. 2).

Furthermore, FIG. 2 shows the result of the speaker system A and the same speaker system except that an unbroken elastic member is installed (“rubber film vent” in FIG. 2), and pressure adjustment in the speaker system A As a result of the speaker system in which a through hole having a diameter of 0.7 mm is provided in the place where the pressure adjusting part is formed instead of the installation of the part and the through hole is filled with the non-woven fabric (in FIG. 2, “φ0.7 hole + nonwoven fabric” )).

FIG. 2 shows that the speaker system A according to the present invention is a speaker system that can adjust the pressure in the speaker cabinet and has the same vibration object as a sealed speaker cabinet. The term “sealing” in this example means that air can enter and exit only through the cuts of the elastic member inside and outside the speaker cabinet.

Further, when the air pressure applied to the inside and the outside of the elastic member is substantially the same, the speaker cabinet in which air does not substantially enter and exit is described as a sealed speaker cabinet.

FIGS. 3A to 3E show examples of speaker systems belonging to the present invention. These examples are speaker systems that further include another cabinet different from the sealed speaker cabinet, and in each of the speaker cabinets, the pressure adjusting unit 4 is provided on the side opposite to the sound radiation direction of the speaker system. Yes.

3 (a) shows an example of a double drive type speaker system, FIG. 3 (b) shows an example of a PPDD (Push-Pull Dual Driver) type speaker system, and FIG. 3 (c) shows a kelton type speaker system. (Part 1: A duct (sound radiating port) is provided in front of the speaker device), FIG. 3 (d) shows an example of a drone cone type (passive radiator type) speaker system (including a drone cone). FIG. 3 (e) shows an example of a kelton-type speaker system (part 2: a duct is provided at a place other than the front of the speaker device).

In the speaker system of the present invention, the speaker device to be used may be any device used in the speaker system, and includes a thin speaker (single-sided drive and double-sided drive) described in Japanese Patent No. 4457165.

FIG. 4 schematically shows an example C of a speaker system including the thin speaker device that is driven on one side.

In the speaker system C, the thin speaker device 10 that is driven on one side is fixed and accommodated in the opening of the speaker cabinet 2. A pressure adjusting unit 4 similar to the speaker system A is provided on the side opposite to the sound radiation direction of the thin speaker device 10. When the pressure difference between the inside and outside of the speaker cabinet 2 is large, the pressure adjusting unit 4 operates. This pressure difference is reduced.

In the thin speaker device 10 that is driven on one side, two drive members 10a that convert an audio signal into vibration are fixed at positions facing each other (up and down in FIG. 4). These driving members 10a generate vibrations in the vertical direction in the figure, and the vibration direction conversion unit 10b converts the vibrations in the vertical direction into vibrations in the horizontal direction in the figure.

That is, the vibration direction conversion unit 10b includes a link portion 10e and a stationary portion 10d fixed to the thin speaker device 10 that is driven on one side, and the link portion 10e includes the two driving members 10a and the vibration portion described above. 10c and a link mechanism configured to be connected to the stationary part 10d converts the vibration in the vertical direction in the figure to the vibration in the horizontal direction in the figure.

The vibration in the left-right direction in the figure is transmitted from the link mechanism to the diaphragm 10c, and the diaphragm 10c reproduces this vibration as a sound, and the sound is radiated to the left side in the figure.

Further, FIG. 5 schematically shows an example D of a dense speaker system provided with the thin speaker device driven on both sides.

The speaker system D has the thin speaker device 11 that is driven on both sides inside the speaker cabinet 2, and the reproduced sound is radiated to the front side of the drawing. Furthermore, pressure adjusting units 4 similar to those of the speaker system A are provided on the upper and lower side surfaces of the speaker cabinet 2 in the drawing. When the pressure difference between the speaker cabinet 2 and the outside is large, these pressure adjusting units 4 are Actuate to reduce this pressure differential.

In the thin speaker device 11 that is driven on both sides, two drive members 11a that convert an audio signal into vibration are fixed at positions facing each other (left and right in FIG. 5). These drive members 11a generate vibrations in the horizontal direction in the drawing, and the vibration direction conversion unit 11b converts the vibrations in the vertical direction into vibrations in the vertical direction in the drawing.

That is, the vibration direction conversion unit 11b is a link mechanism that includes a first diaphragm 11c1 and a second diaphragm 11c2 that are arranged to face each other, and a link portion that is connected to the two drive members 11a. In the figure, the vibration in the left-right direction is converted into the vibration in the up-down direction, and this vibration whose direction is changed is transmitted to each of the first diaphragm 11c1 and the second diaphragm 11c2. The first diaphragm 11c1 and the second diaphragm 11c2 reproduce this vibration as sound, and the sound is radiated in both the left and right directions in the figure.

Here, the vibration direction conversion unit 11b applies vibrations that cause the first diaphragm and the second diaphragm to approach or separate from each other. For this reason, the first diaphragm and the second diaphragm Since the sound generated by the diaphragm 2 is in phase, the speaker device excluding the diaphragm hardly vibrates.

In the speaker systems C and D, vibration is directly transmitted from the vibration direction converter to the diaphragm. However, vibration is transmitted to the diaphragm via a separate member between the vibration direction converter and the diaphragm. Also good.

In the above description, an example in which only one speaker device is fixed and stored in the speaker cabinet has been described. However, a plurality of speaker devices may be fixed and stored in the cabinet, and such a case is also included in the present invention. Two or more pressure adjusting units may be provided.

(Appendix)
A speaker system having a speaker device 1 and a sealed speaker cabinet 2 for fixing and storing the speaker device 1,
A speaker system A comprising a pressure adjusting portion 4 comprising an elastic member 3 having a cut 3a penetrating the inside and outside as a part of a wall separating the inside and outside of the speaker cabinet 2.

According to the speaker system A, the pressure adjustment unit 4 reduces the pressure difference between the inside and outside of the speaker cabinet and prevents the diaphragm from being deformed. In addition, the position of the diaphragm of the speaker returns to a predetermined position, and the original original sound reproduction performance can be exhibited.

Further, when the pressure difference between the inside and outside of the speaker cabinet 2 is eliminated by the release of excessive air inside, the opening formed in the cut 3 a is closed by the restoring force of the elastic member 3 constituting the pressure adjusting unit 4. Therefore, at this time, the sealing performance required for the sealed speaker system is restored, and the original sound reproduction performance as the sealed speaker system is ensured.

Although the present invention has been described with reference to the preferred embodiment, the speaker system of the present invention is not limited to the configuration of the above embodiment.

Those skilled in the art can appropriately modify the speaker system of the present invention in accordance with conventionally known knowledge. As long as the configuration of the speaker system of the present invention is still provided by such modification, it is, of course, included in the category of the present invention.

A, B, C, D Example 1 of the speaker system of the present invention according to the present invention Speaker device 1a Mesh 2 Speaker cabinet 2a Through hole 3 Elastic member 3a Break 4 Pressure adjusting unit 10 Single-sided thin speaker device 10a Drive member 10b Vibration Direction change part 10c Diaphragm 10d Stationary part 10e Link part 11 Thin speaker device 11a driven on both sides 11a Drive member 11b Vibration direction change part 11c1 First diaphragm 11c2 Second diaphragm

Claims

A speaker system having a speaker device and a sealed speaker cabinet for fixing the speaker device,
A speaker system comprising: a pressure adjusting unit made of an elastic member in which a cut is formed in a part of a wall separating the inside and outside of the sealed speaker cabinet.
The speaker system according to claim 1, wherein the elastic member is made of natural rubber or synthetic rubber.
The speaker system according to claim 2, wherein the elastic member is a plate-like elastic member.
The speaker system according to claim 2, wherein the cut is formed in a cross shape.
The speaker system has a speaker device; and
The speaker device is
A drive member that converts an audio signal into vibration,
A vibration direction converter that converts the vibration direction of the vibration by the drive member into vibration in a direction different from the vibration direction; and
The speaker system according to claim 2, further comprising a diaphragm connected to the vibration direction conversion unit directly or via another member.
The speaker system has a speaker device; and
The speaker device is
A drive member that converts an audio signal into vibration,
A vibration direction converter that converts the vibration direction of the vibration by the drive member into vibration in a direction different from the vibration direction; and
The speaker system according to claim 2, further comprising a first diaphragm and a second diaphragm that are connected to the vibration direction conversion unit directly or via another member and are opposed to each other. .
The speaker system according to claim 6, wherein the vibration direction conversion unit is a vibration direction conversion unit that brings the first diaphragm and the second diaphragm close to or away from each other.
4. The speaker system according to claim 3, wherein the pressure adjusting unit is provided on a side opposite to a sound radiation direction of the speaker system.
The speaker system according to claim 1, wherein the sealed speaker cabinet further includes a drone cone.
The speaker system according to claim 1, further comprising a cabinet different from the sealed speaker cabinet on the sound radiation direction side of the speaker device.