JP2000004498A - Speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small sized speaker with high sound quality with respect to a thin and long speaker such as an elliptic type, an oval type and a truck type used for various acoustic devices. SOLUTION: A non-coupling part 12a is provided to at least a minor diameter side of a diaphragm 12 with respect to a coupling part between an upper end of a voice coil 18 and the diaphragm 12. Thus, even when the voice coil 8 whose diameter is large is selected, since an edge equivalent part 12c is sufficiently reserved by the non-coupling section 12a, the speaker is realized by reserving the flexibility with a wide reproduction band, high sound quality and high withstanding input.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elongated speaker having an elliptical shape, an elliptical shape, a track shape and the like used for various kinds of audio equipment.

[0002]

2. Description of the Related Art In recent years, as audio equipment has been miniaturized, a space for mounting a speaker has been narrowed, and a miniaturization of a speaker has been required. Also, with the spread of high-quality sources, it has become indispensable that the speakers have high sound quality and high input resistance.

A conventional elongated speaker will be described with reference to a sectional view of a short side of a track type speaker shown in FIG.

According to FIG. 1, reference numeral 1 denotes a yoke, in which a magnet 2 is connected, and a top plate 3 is connected to an upper portion of the magnet 2 to provide a magnetic gap 9 between the yoke 1 and the top plate 3. A circuit 4 is formed.

[0005] Reference numeral 5 denotes an elongated frame coupled to the upper portion of the magnetic circuit 4, and reference numeral 6 denotes a damper having an outer peripheral portion coupled to the frame 5 and an inner peripheral portion coupled to an intermediate portion of the voice coil 8. The voice coil 8 is fitted in the magnetic gap 9. Reference numeral 7 denotes a dust cap connected to an upper portion of the voice coil 8, and reference numeral 10 denotes a diaphragm having an outer peripheral edge connected to the outer periphery of the frame 5 and an inner peripheral portion connected to the voice coil 8.

[0006]

However, in the above-described conventional configuration, when the outer shape of the frame 5 is reduced for miniaturization and the diameter of the voice coil 8 is increased for improving the input resistance, the edge 11 of the diaphragm 10 is increased. Becomes smaller,
There is a problem that the flexibility is small and the amplitude cannot be large, and as a result, the reproduction band becomes narrow.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to provide a small-sized speaker with high input resistance.

[0008]

According to the present invention, there is provided a loudspeaker comprising: a magnetic circuit having a magnetic gap; a frame having an elongated upper surface connected to the magnetic circuit; A combined elongated diaphragm and a cylindrical voice coil provided with a non-coupled portion at least in the minor axis direction of the diaphragm, and a central portion and an upper end of the diaphragm are coupled and fitted in the magnetic gap. Since the non-coupled portion is provided at the upper end of the diaphragm and the voice coil on the shorter diameter side, the amplitude of the diaphragm can be increased by suppressing the regulation from the shorter diameter side, and as a result, The reproduction band can be widened, the voice coil can be enlarged, and the input resistance can be improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a magnetic circuit having a magnetic gap, a frame having an elongated upper surface coupled to the magnetic circuit, and an elongated frame having an outer periphery coupled to the frame. And a cylindrical voice coil provided with a non-coupled portion at least in the minor axis direction of the diaphragm, a central portion and an upper end of the diaphragm being coupled and fitted in the magnetic gap. Yes, since a non-coupled portion is provided at the upper end of the diaphragm and voice coil on the shorter diameter side, the amplitude of the diaphragm can be increased by suppressing the regulation from the shorter diameter side, and as a result, the reproduction band can be widened. In addition, the size of the voice coil can be increased and the input resistance can be improved.

According to a second aspect of the present invention, there is provided a magnetic circuit having a magnetic gap, an elongated frame coupled to the magnetic circuit and having an elongated upper surface, and an elongated frame coupled to an outer periphery of the frame via an edge. A vibrating plate having at least a lower end of the diaphragm in the minor axis direction of the vibrating plate and an upper end below the edge being a non-joining portion with the edge, and a central portion and an upper end of the vibrating plate being joined and fitted in the magnetic gap; It is composed of a cylindrical voice coil with a diameter larger than the minor diameter of the frame.Because the width of the edge can be kept large regardless of the size of the voice coil, the outer shape of the frame is reduced for miniaturization, Even if the diameter of the voice coil is increased to improve the input resistance, it is possible to provide a speaker with a wide reproduction band, high sound quality and high input resistance.

According to a third aspect of the present invention, the voice coil according to the first or second aspect is formed by cutting off the upper end of the non-coupling portion, and the voice coil at the non-coupling portion when the speaker is driven. To prevent abnormal noise from being generated due to contact between the upper end of the diaphragm and the diaphragm or the edge.

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIG. Note that the same parts as those in the prior art are denoted by the same reference numerals and description thereof will be omitted.

FIG. 1 is a sectional view showing a short-diameter side and a long-diameter side of a track-type speaker according to an embodiment of the present invention, with reference to a center line X. FIG. It is a perspective view of the assembly of a board and a voice coil.

Referring to FIG. 1, only a difference from the prior art will be described. Reference numeral 12 denotes a diaphragm which covers the voice coil 8 and is connected to the upper end of the voice coil 8. The diaphragm 8 is a dust cap of the prior art. 7 (a portion corresponding to the dust cap 7 also has a function as a diaphragm) and an edge-corresponding portion 12c having a reduced curvature and an outer periphery connected to the frame 5. This is a track-shaped diaphragm formed by coating the same material woven fabric with a resin. The diameter of the voice coil 8 is set to be larger as the upper end thereof is positioned below the edge-equivalent portion 12c on the shorter diameter side of the diaphragm 12. ing.

Reference numeral 12a denotes the voice coil 8 of the diaphragm 12.
12b denotes a portion of the diaphragm 12 connected to the upper end of the voice coil 8.

As described above, since the non-coupling portion which is not connected to the upper end of the voice coil 8 is provided on the short diameter side of the track-shaped diaphragm 12, a portion corresponding to the edge of the diaphragm 8 even if the diameter of the voice coil 8 is increased. 12c can be secured enough,
The flexibility can be secured and the reproduction band can be secured.

In the above embodiment, the voice coil 8
Although the non-coupling portion is provided at the protruding portion of the diaphragm 12 corresponding to the edge-equivalent portion 12c, the non-coupling portion may be provided at the main body portion of the diaphragm 12 in the short diameter direction as appropriate in design.

In the above-described embodiment, the edge-equivalent portion 12c has been described as a part of the diaphragm 12.
The edge may be separately coupled to the diaphragm.

By cutting off the upper end of the voice coil 8 corresponding to the non-coupled portion, collision between the diaphragm 12 and the voice coil 8 in the portion at the time of driving the speaker can be prevented, and the noise can be more easily generated at the same time. It is also possible to improve the input.

In the above-described embodiment, the track-type speaker has been described. However, the present invention can be applied to other elongated speakers such as an oval speaker and an elliptical speaker.

[0021]

As described above, the speaker according to the present invention has the following features.
The regulation of the amplitude of the diaphragm from the minor diameter side is suppressed and can be increased. As a result, the reproduction band can be widened, the voice coil can be enlarged, and the input resistance can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a short-diameter side and a long-diameter side of a track-type speaker according to an embodiment of the present invention, which is based on a center line X of the track-type speaker;

FIG. 2 is a perspective view of the main part.

FIG. 3 is a cross-sectional side view of a conventional elongated speaker in a short diameter side.

[Explanation of symbols]

 Reference Signs List 4 Magnetic circuit 5 Frame 8 Voice coil 9 Magnetic gap 12 Diaphragm 12a Non-joined part (with upper end of voice coil) 12b Jointed part (with upper end of voice coil) 12c Edge equivalent part

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Yano 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. F-term (reference) 5D012 BA06 BB01 BB02 CA08 EA06

Claims (3)

[Claims] 1. A magnetic circuit having a magnetic gap, a frame having an elongated upper surface coupled to the magnetic circuit, an elongated diaphragm having an outer periphery coupled to the frame, and at least a minor axis direction of the diaphragm. A speaker comprising a cylindrical voice coil having a non-coupling portion, a central portion of the diaphragm and an upper end coupled to each other and fitted in the magnetic gap. 2. A magnetic circuit having a magnetic gap, a frame coupled to the magnetic circuit and having an elongated upper surface, an elongated diaphragm having an outer periphery coupled to the frame via an edge, and at least the diaphragm. In the minor axis direction, the upper end below the edge is a non-joined part with the edge, and the central part and the upper end of the diaphragm are joined together and fitted into the magnetic gap. Speaker composed of a voice coil. 3. The loudspeaker according to claim 1, wherein an upper end of the voice coil in a non-coupling portion is cut off.