JPS61212997A - Speaker - Google Patents

Abstract

PURPOSE:To prevent a cone suspension from producing abnormal sound even if it is vibrated with a large amplitude during attachment of a small sized cabinet by controlling the difference of an air pressure between the inside and outside part of the cone suspension of a speaker, so as to expanding the surface always. CONSTITUTION:A diaphragm 29 of the speaker 30 is vibratably mounted to a frame 21 through a damper 32 and a cone suspension 33 consisting of a spacer having two roll edges 16a, 16b having semicylindrical cross-section, an edge securing ring 18 and a one-way air rectification valve 19. The speaker 30 is mounted within a cabinet 31. When the diaphragm 29 is vibrated back and forth and the inner pressure of the suspension 33 exceeds the inner pressure of the cabinet 31, the valve 19 is opened. Otherwise, the valve is closed. As a result, the inner radius side air pressure of the half cylinder forming the edges 16a, 16b is equal to or larger than the outside radius side pressure so that the surface of the edges 16a, 16b are in stretched state.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention controls the pressure difference between the inside and outside of the speaker cone Φ suspension and constantly expands its surface, thereby producing large amplitude vibrations when mounted in a small cabinet. This is a speaker system that prevents the cone suspension from producing abnormal noise.

BACKGROUND OF THE INVENTION In recent years, audio equipment has become significantly smaller due to advances in semiconductor technology and the emergence of high-performance compact circuit components. Speaker systems are also becoming smaller, whether for home use or car-mounted systems, but the lowest resonant frequency of a speaker system in which the speaker is mounted in a small cabinet (referred to as f) is due to the volume of the cabinet. Bonox stiffness significantly increases the lowest resonance frequency (hereinafter referred to as f) of the speaker itself. Therefore, the acoustic characteristics in the bass range were poor. Here, in order to improve the acoustic characteristics in the bass range, a subwoofer system, as seen in the 3-Dimensionat Nupika system, has been used in the past.

The speaker system found in the above-mentioned subwoofer system will be described below with reference to the drawings.

FIG. 4 is a sectional view of a speaker system installed in a small cabinet. In FIG. 4, 1 is a bottom plate, 2 is a ring-shaped magnet, and 3 is a top plate. The bottom plate 1 and the top plate 3 sandwich the magnet 2 to form an annular magnetic gap 4. 5 is a frame fixed on the top plate 3.

6 is a voice coil, and 7 is a voice coil bobbin around which the voice coil 6 is wound.The voice coil 6 is suspended from the frame 5 via a wave-shaped damper 8 so that it can vibrate in the magnetic gap 4. Reference numeral 9 denotes an inverted head-shaped cone paper, whose lower part is fixed near the upper end of the voice coil bobbin 7;
Further, the outer peripheral portion is suspended from the frame 5 via a roll edge 10 having a semi-cylindrical cross section. 11 is roll edge 1o
This is a gasket that reinforces the outer periphery of the adhesive. 12 is a dust cap seal that closes the hole in the center of the paper cone 9. 1
3 is a diaphragm formed from a paper cone 9 and a dust cap 12. The speaker 14 is configured as described above,
It is attached to the cabinet 15.

The operation of the conventional speaker system configured as described above will be described below.

Bottom plate 1, magnet 2 and top plate 3
When a signal current flows through the voice coil 6 in the magnetic gap 4 formed by the above, the voice coil 6 vibrates in accordance with the signal current. This driving force is transmitted by the voice coil bobbin 7 to a diaphragm 13 made up of a paper cone 9 and a dust cap 12, and the diaphragm 13 generates compression waves before and after it.

The roll edge 10 not only supports the diaphragm 13 so that it can vibrate together with the voice coil bobbin 7, but also has the function of partitioning the front and rear compressional waves together with the cabinet 16.

Problems to be Solved by the Invention However, the above configuration has the following problems.

Now, SD is the effective vibration area of the diaphragm, X is the amount of longitudinal displacement of the diaphragm, and V is the volume of space enclosed by the cabinet and the diaphragm when it is at rest. , the air pressure inside the cabinet at that time is P. ,
If the air pressure inside the cabinet when the diaphragm is displaced by X back and forth is P, PB, equations (1) to (3) hold true.

Povo-PF(vo+5D-x)-P, (vo-8D
-x)・・・・・・・・・・・・ (1) 67, -1 In other words, when the diaphragm is displaced forward, the pressure P inside the cabinet becomes lower than atmospheric pressure, and vice versa. When the diaphragm is displaced backward, the pressure PB inside the cabinet increases.

Here, in the case of a so-called upper roll in which the roll edge 10 is arranged in a convex shape in the front as shown in Fig. 4, even if the diaphragm is displaced rearward and the pressure inside the cabinet increases, the roll edge 1o will not be locally deformed. does not produce any abnormal noise. This is because the shape is optimal when the pressure inside the circular cylinder is higher than the pressure outside. However, when the diaphragm moves forward and the air pressure inside the cabinet decreases, the roll edge locally deforms (reverse vibration) and generates abnormal noise.

This problem occurs in subwoofer systems for low frequency reproduction with small cabinet volumes and 3-Dimension for automobiles.
This problem tends to occur in AT speaker systems.

The present invention has been made in view of the above problems.

To provide a speaker system in which a speaker is mounted in a small cabinet and a cone suspension does not generate abnormal noise even when subjected to large amplitude vibrations.

Means for Solving the Problems In order to achieve this object, the speaker system of the present invention includes a diaphragm that vibrates in response to an input signal, and two edges having a semi-cylindrical cross section on the outer periphery of the diaphragm. and a cone suspension connected in opposite directions to each other through a spacer having at least one or more one-way air rectifier valve between the outer circumference sides of at least each edge, said one-way air rectifier valve. is configured by rectifying changes in atmospheric pressure that frequently occur due to vibrations of the diaphragm, and setting the atmospheric pressure on the inner diameter side of the semi-cylindrical edge to be equal to or higher than the atmospheric pressure on the outer diameter side. There is.

Effect: According to this configuration, a large change in air pressure occurs inside the cabinet due to the cabinet and the diaphragm that vibrates with a large amplitude due to input signals, especially signals in the low frequency range. This pressure change is rectified and guided into the inner space of the cone suspension, which has two semi-cylindrical edges oriented in opposite directions, so that the pressure on the inner diameter side of the semi-cylindrical edge is equal to the pressure on the outer diameter side. By making it equal to or higher than , no force is generated on the edge surface to contract inward. Therefore, even if a large amplitude vibration occurs, it is possible to prevent the edge from reversing vibration and generating abnormal noise.

EXAMPLE An example of the present invention will be described below with reference to the drawings. FIG. 1 shows a sectional view of a speaker system according to an embodiment of the present invention.

In FIG. 1, 16a and 16b are roll edges having a semi-cylindrical cross section, which are arranged in opposite directions so that the convex portions of the edges face each other, and the inner circumferential side adhesive portion is fixed to the outer circumferential portion of the cone paper 17. is fixed to the edge fixing ring 18,
In addition, between the outer peripheral side panels, a frame 21 is inserted through a spacer 20 having at least one one-way air rectifying valve 19 in the north.
is fixed to. In addition, 22 is the bottom plate, 23
is the magnet, 24 is the top plate, 25 is the magnetic gap, 26 is the voice coil, 2 is the voice coil 9, 28 is the dust cap, 29 is the cone paper 17
A diaphragm consisting of a dust cap 28 and a diaphragm 28, a speaker 31 and a dust cap 28, a speaker 31, and a cabinet 31 are the same as those of the conventional example. 32 is a damper in which a cylindrical body with a square cross section is continuously arranged in the circumferential direction, and the voice coil bobbin 27 is connected to the frame 2 through this damper.
There is a hanging shizake in 1. The cone suspension 33 consists of an edge fixing ring 18, two roll edges 161L and 16b facing oppositely to each other, a one-way air rectifying valve 19, and a gasket 2o.

The operation of the speaker configured as described above will be described below. The diaphragm 29 vibrates back and forth as described in the explanation of the operation of the conventional example. The diaphragm 29 is suspended by a cone suspension 33 and a damper 32 fixed to the voice coil bobbin 27 so as to be able to vibrate. Here, the one-way air rectifying valve 191d opens 1 when the internal pressure of the cone suspension 33 (hereinafter referred to as P8) is higher than the internal pressure of the cabinet 31 (hereinafter referred to as P).
0 Heh.

and vice versa. Now, consider the case when the diaphragm 29 vibrated before. In this case, Po is lower than the atmospheric pressure outside the speaker system (hereinafter referred to as P2L), and Ps is P. If it is high enough (for example, during the first vibration,
If there is excessive vibration than before), one-way air rectifier valve 19
When the bottle is opened, Ps becomes the same as P, and conversely, P8 becomes P.

If it is lower, it is closed. Therefore, the respective pressure relationships are as shown in equation (4).

P＜P＜P, ・・・・・・・・・・・・・・・〔4
)S -0 Conversely, if the diaphragm 29 vibrates later, only at the beginning (5)
The equality sign of the expression holds, and the inequality sign holds thereafter.

P8≦p, <p.・・・・・・・・・・・・・・・
(5) Therefore, in the case of a cone suspension having a shape in which the convex surfaces of the roll edges face each other as shown in FIG. 1, Ps is always P. In other words, the pressure on the inner diameter side of the semicircular cylinder forming the roll edge is equal to or higher than the pressure on the outer diameter side, so the surface of the roll edge is under tension.

As described above, according to this embodiment, a diaphragm that vibrates in accordance with an input signal, and two edges having a semi-cylindrical cross section on the outer periphery of the diaphragm are arranged in opposite directions, and at least A spacer having at least one one-way air rectifying valve on the north side was connected between the circumferential measurements of each edge. and a cone suspension that forms a space inside, and the one-way air rectifying valve rectifies changes in atmospheric pressure caused by vibration of the diaphragm, and directs atmospheric pressure on the inner diameter side of the semi-cylindrical edge to the outside. By configuring the air pressure to be equal to or higher than the radial air pressure, the surface of the roll edge can be kept under tension, and even when the speaker system is installed with speakers in a small cabinet, the roll edge can be maintained even when the amplitude is large. This can prevent reverse vibrations from producing abnormal noise.

Other embodiments of the present invention will be described below with reference to one drawing. FIG. 2(a) is a sectional view of the cone suspension part of a Kelsspeaker in another example of the present invention, and FIG. 2(b) is one of the edges used in FIG. 2(a). This is the cross-sectional shape during molding.

In FIG. 2(b), the edge 34a consists of a truncated conical slope portion 35&, an outer peripheral side formation 36a and an inner peripheral side formation 37a provided at the upper and lower ends thereof. In FIG. 2 (2L), when assembling the two pieces, bend the above-mentioned edges into a V-shape in opposite directions,
Each inner circumferential side formation (37L.

37b) is fixed to an edge fixing ring 39 fixed to the outer periphery of the paper cone 38. Further, the outer peripheral side formations (3ea, 5eb) of each edge are fixed to a frame 42 via a spacer 41 having at least one one-way air rectifying valve 40.

43u above t, *Cone suspension teal.

The operation of the speaker cone suspension configured as described above will be described below.

The two edges 34&, 34b bent into a V shape are deformed as the bent portions are sequentially moved radially on the edge surface in accordance with the vibration of the diaphragm.

As described in the first embodiment, the pressure change inside the cabinet caused by the vibration of the diaphragm 38 is adjusted by the one-way air rectifier valve 40, and the internal pressure Ps of the cone suspension 13 and the john 43 is adjusted to another pressure. (Pa, Po)
, or the surface of the edge (34J 34b) and the bent portion will be tensioned in an arc shape as shown by the dotted line in the figure.

As described above, according to this embodiment, two edges each consisting of a sloped part of a truncated cone and formations provided on its upper and lower end surfaces are bent into V-shapes in opposite directions when assembled.

At least the outer peripheral sides of each edge are joined via a spacer having at least one one-way air rectifying valve. It has a cone suspension that forms a space inside, and the one-way air rectifier valve is configured to set the air pressure on the acute side of the V-shaped edge to be equal to or higher than the air pressure on the obtuse side. In a speaker system in which the surface of the V-shaped edge is kept under tension and the speaker is mounted in a small cabinet, the edge can be prevented from reversing vibration and producing abnormal noise even when the amplitude is large, and the diameter of the bent part can be It is possible to move smoothly in the direction without generating any abnormal noise, and it is also possible to vibrate with a larger amplitude than the roll edge.

In each of the embodiments, a cone suspension in which the convex surfaces of the two edges face each other is used, but a configuration in which the concave surfaces of the two edges face each other and the rectifying direction of the one-way air rectifying valve is set in the opposite direction is used, for example. As shown in Figure 3, with the concave surfaces of the roll edges facing each other, each inner circumferential side is directly fixed to the outer circumference of the cone paper, and a frame is inserted between the outer circumferential sides with a spacer having a one-way air rectifying valve. Needless to say, even in a configuration in which the edge fixing ring is fixed to the edge fixing ring and the rectifying direction of the air rectifying valve is set in a direction higher than atmospheric pressure, the mass of the vibration system can be reduced by the amount of the edge fixing ring and the same effect can be obtained.

Effects of the Invention The present invention provides a diaphragm that vibrates in response to an input signal, and a diaphragm having two edges on the outer periphery of the diaphragm having a semi-cylindrical cross section in opposite directions, and at least between the outer periphery of each edge. and a cone suspension having at least one or more one-way air rectifying valves connected via a spacer to form a space therein, the one-way air rectifying valves being connected to the inner diameter side of the edge. By setting the air pressure to be equal to or higher than the outside air pressure, the edge surface is kept under tension, causing the edge to vibrate in reverse and generate abnormal noise even in response to large pressure changes inside the cabinet. The aim is to realize a speaker system for a small cabinet that prevents such problems from occurring. Furthermore, by using two edges that have formations on the slope and upper and lower end surfaces of the truncated cone and can be bent into a V-shape and pasted during one assembly as the edges forming the cone suspension, larger amplitude vibrations are possible and abnormalities can be avoided. It is possible to realize a speaker system that can prevent sound generation.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a speaker in an embodiment of the present invention;
FIG. 2(&) is a sectional view of the cone suspension part of a speaker according to another embodiment of the present invention, FIG. 2(b) is a sectional view of the edge used in FIG. 2(a) during molding, FIG. 3 is a sectional view of a cone suspension section according to another embodiment of the present invention, and FIG. 4 is a sectional view of a conventional speaker installed in a small cabinet. 16a, 16b...roll edge, 17...
... Cone paper, 18 ... Edge fixing ring, 19
...One-way air rectifier valve, 2o... Nubesa,
21...Frame 33...Cone suspension.

Claims (2)

[Claims] (1) A diaphragm that vibrates in accordance with an input signal, and two edges having a semi-cylindrical cross section on the outer periphery of the diaphragm in opposite directions, and at least between the outer periphery side of each edge,
and a cone suspension that forms a space inside the cone suspension, which is joined via a spacer and has at least one one-way air rectifying valve, and the one-way air rectifying valve is connected to a A speaker characterized in that the change is rectified so that the pressure on the inner diameter side of the semi-cylindrical edge is set to be equal to or higher than the pressure on the outer diameter side. (2) When assembling, two edges consisting of the slope part of the truncated cone and the adhesive allowances provided on the upper and lower end surfaces are bent into V-shapes in opposite directions, and at least between the adhesive allowances on the outer circumferential side of each edge, A cone that forms a space inside joined via a spacer with at least one one-way air rectifying valve.
2. The speaker according to claim 1, wherein the speaker has a suspension, and wherein the one-way air rectifying valve is set in a direction in which the air pressure on the acute side of the V-shaped edge is equal to or higher than the air pressure on the obtuse side.