JP4024334B2 - Speaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a speaker having an elongated structure used for various kinds of audio equipment.
[0002]
[Prior art]
Prior art will be described with reference to FIGS. FIG. 9 is a cross-sectional view in the major axis direction of a conventional track-type speaker that is an elongated shape, FIG. 10 is a plan view of a cone-shaped diaphragm that is the main part, and FIG. 11 is a cone shape that is the main part. FIG. 12 is a cross-sectional view of the diaphragm of FIG. 10 taken along the line AA of FIG. 10, FIG. 12 is a cross-sectional view of the cone-shaped diaphragm of FIG. It is sectional drawing of CC line of FIG. 10 of the cone-shaped diaphragm which is these.
[0003]
According to the figure, the speaker combines a track-shaped frame 6 having an elongated opening plane with an upper plate 2 of a magnetic circuit 4 formed by sandwiching a magnet 1 with an upper plate 2 and a lower plate 3. A flat elongated horn-shaped diaphragm 9 having a configuration in which a cone 7 is clamped by an edge 8 is bonded to the peripheral edge, and an intermediate part of a voice coil 10 for driving the diaphragm 9 is held at the center by a damper 11. Then, the magnetic circuit 4 is coupled so as to fit into the annular magnetic gap 5, and the dust cap 12 is adhered to the upper surface of the voice coil 10.
[0004]
The diaphragm 9 is composed of four plane parts a and b, and a ridge line 13 is formed at the boundary line, and the plane parts are formed on both sides of the plane part a as shown in the sectional views of FIGS. The flat portion a was continuously formed to be shallower and shallower as the height b increased and the distance from the voice coil 10 in the longer diameter direction increased.
[0005]
[Problems to be solved by the invention]
However, this type of conventional speaker has a performance disadvantage that is affected by the slim shape of the track type. As a result, an unnecessary resonance mode is generated in the diaphragm 9, resulting in unstable characteristics with many peaks and dips. This has a difficult design problem.
[0006]
The cause of this is that an unnecessary resonance mode occurs when the vibration mode of the diaphragm 9 changes depending on the frequency. This is due to the fate of the track-shaped diaphragm. If it is a shape close to a plane, an unnecessary resonance mode occurs only in this part, and an opposite phase or phase difference occurs with respect to other parts that vibrate in the same phase as the voice coil. This is because peaks and dips occur.
[0007]
The generation of this unnecessary resonance mode tends to occur mostly at the outer peripheral part in the major axis direction or at the central part in the minor axis direction. This is because this portion has a shape closer to a plane.
[0008]
An object of the present invention is to provide an excellent speaker capable of solving such a conventional problem and stabilizing in terms of frequency characteristics.
[0009]
[Means for Solving the Problems]
In order to solve the above problems, a speaker according to the present invention includes a magnetic circuit having at least an annular magnetic gap, a frame having an elongated shape coupled to the magnetic circuit, and an outer periphery coupled to the frame via an edge. The cone-shaped diaphragm is coupled between the central portion and the outer periphery of the long-diameter direction of the track-shaped cone-shaped diaphragm and the inner circumference is coupled to the cylindrical voice coil bobbin fitted into the annular magnetic gap. In order to avoid the formation of a flat surface portion, a semicircular arc-shaped portion is provided in the cross section in the short diameter direction, and the cross-sectional shape in the short diameter direction closer to the outer peripheral portion is closer to the outer peripheral portion. to form a curvature of the small Kushida arc shape, the minor axis of the cross-sectional shape close to an inner peripheral portion than the semicircular arc portion, as becomes close to the inner peripheral portion, minor axis at the center of the major axis It is composed of a track-shaped diaphragm that has a surface shape formed at a moderate rate of change so as to be close to the cross-sectional shape. Therefore, it is possible to provide a speaker having an elongated shape with a high aspect ratio and a stable frequency characteristic.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
According to the first aspect of the present invention, there is provided a magnetic circuit provided with at least an annular magnetic gap, a frame having an elongated shape coupled to the magnetic circuit, and an outer periphery coupled to the frame via an edge. The inner circumference is coupled to the cylindrical voice coil bobbin fitted into the annular magnetic gap, and the cone-shaped diaphragm is disposed between the central portion and the outer circumference in the major axis direction of the track-shaped cone-shaped diaphragm. In order to avoid the formation of a flat surface portion, a semicircular arc-shaped portion is provided in the cross section in the short diameter direction, and the cross-sectional shape in the short diameter direction closer to the outer peripheral portion than the semicircular arc shape portion becomes an arc shape as it approaches the outer peripheral portion. to form a curvature in the small Kushida arc-minor axis of the cross-sectional shape close to an inner peripheral portion than the semicircular arc portion, as becomes close to the inner circumferential portion, of the minor axis at the center of the major axis direction cross-section In shape As a result, it is possible to prevent the occurrence of unnecessary resonance by avoiding the formation of a plane part as much as possible by making the cross section of the diaphragm arc as an arc shape. This is an elongated shape with a high aspect ratio, which stabilizes frequency characteristics.
[0011]
Hereinafter, an embodiment of a speaker of the present invention will be described with reference to FIGS.
[0012]
(Embodiment 1)
FIG. 1 is a cross-sectional view in the major axis direction of an elongated track-type speaker according to an embodiment of the present invention, FIG. 2 is a plan view of a cone-shaped diaphragm, which is the main part, and FIG. 2 is a sectional view taken along the line DD of FIG. 2 of the cone-shaped diaphragm as the main part, FIG. 4 is a sectional view taken along the line EE of FIG. 2 of the cone-shaped diaphragm as the major part, and FIG. 2 is a cross-sectional view of the main part of the cone-shaped diaphragm taken along line FF in FIG. 2, FIG. 6 is a cross-sectional view of the main part of the cone-shaped diaphragm taken along line GG of FIG. 2, and FIG. FIGS. 8A and 8B are cross-sectional views of the H-H line in FIG. 2 of the cone-shaped diaphragm which is a main part, and FIGS. 8A and 8B are frequency characteristic diagrams.
[0013]
According to the figure, a track-shaped frame 26 having an elongated opening plane is coupled to an upper plate 22 of a magnetic circuit 24 formed by sandwiching a magnet 21 with an upper plate 22 and a lower plate 23, and a peripheral portion of the frame 26 A cone-shaped diaphragm 29 having a flat and elongated track shape is bonded to the cone 27 by an edge 28, and a voice coil 30 is driven to drive the diaphragm 29. It is coupled to the inner periphery of the diaphragm 29 so as to fit into the annular magnetic gap 25 while being held, and a dust cap 32 is adhered to the upper surface of the voice coil 30.
[0014]
The diaphragm 29 has an arcuate curved surface in the minor axis direction except for the vicinity of the voice coil 30. That is, except that the cross section of the DD line in FIG. 2 shown in FIG. 3 (in the vicinity of the voice coil 30) has a conventional linear shape (that is, both sides of the voice coil 30 are planar). As shown in each cross-sectional view in the minor axis direction of the diaphragm 29 shown in FIGS. 4 to 7, an arcuate curved surface is formed.
[0015]
The cross-sectional shape along the line DD to HH shown in FIG. 2 will be described with reference to FIGS. 3 to 7. FIG. 3 shows the central cross section DD of FIG. This is a cross-sectional shape constituted by three sides in a state where the two straight slopes 27A and 27B of the central cross section and the plane portion 27C of the voice coil bonding portion are joined, and this shape is the same as the conventional one.
[0016]
Further, FIG. 4 shows a curved shape 27E showing a cross-sectional shape EE close to the central portion in the middle portion between the central portion and the outer peripheral portion, and the cross section on the three sides in FIG. 3 is changed in the outer diameter direction. The shape is rounded and rounded. About FIG. 5, it is the curve shape 27F which showed the cross-sectional shape FF of the center part and the intermediate part of an outer peripheral part, and is a semicircular arc shape. For Figure 6 is a curved 27G shows the cross-sectional shape G-G close to the outer periphery of the intermediate portion of the center portion and the peripheral portion, and a small Kushida arc shape further curvature semicircular shape of the Figure 5 It has become. Furthermore, for FIG. 7 is a curved 27H shows a cross-sectional shape H-H of the outer peripheral portion, constitute a curvature of the arc shape of the Figure 6 for a further small Kushida arc shape.
[0017]
By configuring the track-type diaphragm with such a cross-sectional shape, the shape in the plan view has no inflection point at which the inclination changes abruptly on the cone surface, as shown in FIG. Since the surface shape is changed, the surface configuration is smooth and the ridgeline does not appear clearly.
[0018]
Therefore, as shown in FIG. 8A, the frequency characteristic of the present embodiment is such that the peak dip is suppressed as compared with the conventional one of FIG. 8B, and the speaker has a stabilized frequency characteristic. It is.
[0019]
【The invention's effect】
As described above, the loudspeaker of the present invention has a magnetic circuit having at least an annular magnetic gap, a frame having an elongated shape coupled to the magnetic circuit, and an outer periphery coupled to the frame via an edge. The planar portion of the cone-shaped diaphragm is coupled between the central portion and the outer circumferential portion of the long-diameter direction of the track-shaped cone-shaped diaphragm while being coupled to the cylindrical voice coil bobbin whose circumference is fitted into the annular magnetic gap. In order to avoid the formation of a semicircular arc-shaped portion in the cross section in the minor axis direction, the sectional shape in the minor axis direction closer to the outer peripheral portion than the semi-arc shaped portion has a curvature of the arc shape as it approaches the outer peripheral portion. and forming a small Kushida arc-minor axis of the cross-sectional shape close to an inner peripheral portion than the semicircular arc portion, as becomes close to the inner peripheral portion, the minor axis of the cross section at the center of the major axis It is composed of a track-shaped diaphragm whose surface shape is formed at a moderate rate of change, and the diaphragm has an arc-shaped cross section to avoid the formation of a plane part as much as possible, so that unnecessary resonance is generated. It is possible to provide a speaker that can be prevented and has an elongated shape with a high aspect ratio and has stabilized frequency characteristics.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view in the major axis direction of an elongated track-type speaker according to an embodiment of the present invention. FIG. 2 is a plan view of a cone-shaped diaphragm that is the main part. 2 is a cross-sectional view of the main part of the cone-shaped diaphragm taken along the line DD of FIG. 2. FIG. 4 is a cross-sectional view of the main part of the cone-shaped diaphragm of FIG. 2 is a cross-sectional view of the main part of the cone-shaped diaphragm taken along line FF in FIG. 2. FIG. 6 is a cross-sectional view of the main part of the cone-shaped diaphragm taken along line GG in FIG. 2 is a cross-sectional view of the H-H line in FIG. 2 of the cone-shaped diaphragm which is the main part. [FIG. 8] (a) Same frequency characteristic diagram (b) Frequency characteristic diagram of conventional speaker [FIG. FIG. 10 is a plan view of a cone-shaped diaphragm that is the main part of the track-type speaker. FIG. 11 is a plan view of the cone-shaped diaphragm that is the main part. 10 is a cross-sectional view taken along line AA in FIG. 10. FIG. 12 is a cross-sectional view taken along line BB in FIG. 10 of the cone-shaped diaphragm as the main part. FIG. Sectional view of line 10 CC [Explanation of symbols]
24 Magnetic circuit 26 Frame 29 Diaphragm 30 Voice coil

Claims (1)

A magnetic circuit having at least an annular magnetic gap, a frame having a long and narrow plane coupled to the magnetic circuit, and a cylindrical voice having an outer periphery coupled to the frame and an inner periphery fitted into the annular magnetic gap. In addition to being coupled to the coil bobbin, in order to avoid the formation of a flat portion of the cone-shaped diaphragm between the central part and the outer periphery of the long-diameter direction of the track-shaped cone-shaped diaphragm, the cross section in the minor diameter direction is half the arcuate portion is provided, the short radial cross section is closer to the outer periphery than the semi-circular portion, as becomes closer to the outer peripheral portion, to form a curvature of the arc-shaped small Kushida arc shape, the semi-circular The cross-sectional shape in the minor axis direction closer to the inner peripheral part than the inner part forms a surface shape with a moderate rate of change so that it approaches the sectional shape in the minor axis direction at the central part in the major axis direction as it approaches the inner peripheral part. Shi Speaker constituted by the track shape diaphragm.

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