JP2012044352A - Loudspeaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an internal structure capable of applying to a loudspeaker with the same appearance as usual for improving a sound pressure in a high register.SOLUTION: A loudspeaker 1 comprises: a magnetic circuit body 70, 80, and 90; a voice coil 50 inserted in the magnetic circuit body; a frame 40 connected to the magnetic circuit body; and a cone type diaphragm 10. The inner periphery part of the cone type diaphragm 10 is connected with the voice coil 50, and the outer periphery part of the cone type diaphragm 10 is coupled with the frame 40 through an edge 20. The outer peripheral part of the cone type diaphragm 10 has a long circle or an ellipse, and the cone type diaphragm has a flat part 11 extended in the long axis direction of the long circle or the ellipse in the vicinity of the inner periphery part. The flat part 11 is parallel to a flat plane containing the long circle or the ellipse.

Description

  The present invention relates to a speaker as an electroacoustic transducer, and more particularly to a cone-type speaker that is suitably used in audio equipment, a television receiver, an automobile, and the like.

Corn speakers are often used as speakers installed in audio equipment, television receivers, or transportation equipment such as automobiles.
FIG. 4 shows a cross-sectional view of a conventional cone-shaped speaker. The frame 40 is coupled to the field portion where the yoke 80, the ring-shaped magnet 70, and the ring-shaped plate 90 are laminated and joined, and the peripheral edge (edge 20) of the outer periphery of the cone-shaped diaphragm 10 is connected to the peripheral edge of the frame 40. The voice coil 50 is coupled to the inner peripheral portion of the cone-shaped diaphragm 10, the middle portion of the voice coil 50 is held by the damper 30, and the lower portion of the voice coil 50 is fitted into the central portion of the yoke 80. The dust cap 60 is attached to the center upper surface of the cone-shaped diaphragm 10. At this time, the cone-shaped diaphragm 10 is coupled obliquely with a specific apex angle with respect to the central axis of the voice coil 50. The speaker 2 may be provided with a gasket 100 so that the edge 20 is sandwiched between the frames.

JP 2008-11349 A

  With recent developments in communication technology and acoustic technology, electrical data for reproducing high-quality sound can be obtained. On the other hand, in order to enjoy high-quality content for users, it is crucial to improve the performance of speakers that convert electrical signals into sound. In recent televisions and audio devices, ellipse or ellipse-shaped small speakers are preferably used, and further improvement in performance of this type of speaker is required. In view of this, an object of the present invention is to provide a loudspeaker structure that can improve the sound pressure in a high sound range in a speaker having the same external shape as a conventional one, for example, a small speaker.

As a result of intensive studies by the inventors, the present invention as described below has been completed.
(1) It has a magnetic circuit body, a voice coil fitted into the gap of the magnetic circuit body, a frame coupled to the magnetic circuit body, and a cone-shaped diaphragm, and an inner peripheral portion of the cone-shaped diaphragm is Connected to the voice coil, the outer periphery of the cone-shaped diaphragm is connected to the frame via an edge, and the outer periphery of the cone-shaped diaphragm is oval or elliptical. A speaker having a flat portion extending in a major axis direction of the ellipse or ellipse in the vicinity, and the flat portion is parallel to a plane including the ellipse or ellipse.
(2) The speaker according to (1), wherein a flat portion of the cone-shaped diaphragm does not extend in the minor axis direction of the ellipse or ellipse.
(3) A damper that holds the voice coil is further provided, and a part of the damper is a flat part, and the flat part of the damper and the flat part of the cone-shaped diaphragm are bonded and fixed (1) or (2) Speaker.
(4) When the voice coil is cylindrical with a diameter a and the length of the flat portion of the cone-shaped diaphragm in the major axis direction of the ellipse or ellipse is b, b / a is 1.2-3. 5. The speaker according to any one of (1) to (3).

  According to the present invention, in an oval or elliptical speaker having the same external shape as the conventional one, the rigidity of the flat portion provided in the long diameter portion is increased by the support by the short diameter portion of the cone-shaped diaphragm, and the high sound range is increased. Sound pressure can be increased. In a preferred embodiment, the rigidity of the cone-shaped diaphragm is further increased by providing a flat section on the damper corresponding to the flat section of the cone-shaped diaphragm and bonding it to the flat section of the cone-shaped diaphragm. It is possible to improve the sound pressure in the high sound range.

It is a schematic cross section of the speaker in the embodiment of the present invention. FIG. 2A is a plan view showing the arrangement of the cone-shaped diaphragm, frame and voice coil of the speaker of the present invention. 2B is a cross-sectional view of the cone-shaped diaphragm taken along line XX ′ of FIG. 2A, and FIG. 2C is a cross-sectional view of the cone-shaped diaphragm of FIG. 2A taken along line YY ′. is there. It is a fragmentary sectional view of the speaker which shows arrangement | positioning of a cone-shaped diaphragm and a damper in the suitable form of this invention. It is a schematic cross section of the conventional speaker. 4 is a graph of measurement results obtained by the speaker of Example 1. 10 is a graph of measurement results obtained by the speaker of Comparative Example 1.

Hereinafter, the present invention will be described in more detail with reference to the drawings. However, the drawings are for reference, and the scope of the present invention is not limited to the illustrated embodiment.
FIG. 1 is a schematic cross-sectional view of a speaker according to the present invention. The speaker 1 has a magnetic circuit body. In the aspect of FIG. 1, a magnetic circuit body is configured by the yoke 80, the ring-shaped magnet 70, and the ring-shaped plate 90. The voice coil 50 is fitted in the gap (magnetic gap) of the magnetic circuit body. The arrangement of the magnetic circuit body and the voice coil 50 is not particularly limited, and conventionally known speaker structures and the like can be appropriately referred to. A conventionally known magnetic circuit body of the speaker can be used as appropriate.

  The speaker 1 has a frame 40. The frame 40 is generally cylindrical, but is not limited thereto, and serves as a framework for fixing each part of the speaker. In the embodiment of FIG. 1, the frame 40 is fixed on the plate 90. Further, the cone-shaped diaphragm 10 is fixed to the portion of the frame 40 farthest from the magnetic circuit body via the edge 20, and the cone-shaped diaphragm 10 is stretched by the frame 40. FIG. 2 is a plan view of the frame and the cone-shaped diaphragm. As shown in FIG. 2, in the present invention, when viewed from above, the outer peripheral portion of the frame 40, that is, the outer peripheral portion of the cone-shaped diaphragm 10 has an oval or elliptical shape.

  A voice coil 50 is fitted near the center of the yoke 80. An intermediate portion of the voice coil 50 is held by a damper 30. The voice coil 50 is generally cylindrical, and the diameter of the cylinder is represented as a in FIG. The central axis when the voice coil 50 is cylindrical is usually the same as the central axis of an ellipse or ellipse formed by the outer periphery of the frame 40. In other words, the central axis when the voice coil 50 is cylindrical is usually the same as the central axis of an ellipse or ellipse formed by the outer periphery of the cone-shaped diaphragm 10. A dust cap 60 may be provided on the central upper surface of the cone-shaped diaphragm 10.

  The cone-shaped diaphragm 10 vibrates to generate sound. When viewed from above (FIG. 2), the cone-shaped diaphragm 10 is stretched so as to present an ellipse or an ellipse, and has a circular space at the center thereof. The voice coil 50 is located in this space. The inner peripheral portion of the cone-shaped diaphragm 10 is coupled to the voice coil 50 fitted in the (magnetic) gap of the magnetic circuit body, and the outer peripheral portion is coupled to the frame 40 via the edge 20.

  According to the present invention, the cone-shaped diaphragm 10 has a flat portion 11 and an inclined portion 12. The plane including the ellipse or ellipse formed by the outer periphery of the cone-shaped diaphragm 10 and the plane of the flat portion 11 are parallel. In other words, the plane formed by the flat portion 11 is perpendicular to the central axis of the ellipse or ellipse formed by the outer periphery of the cone-shaped diaphragm 10. In the case where the voice coil 50 is cylindrical and has a central axis and an elliptical or elliptical central axis formed by the outer periphery of the cone-shaped diaphragm 10, the flat surface of the flat portion 11 is It is perpendicular to the 50 central axis.

  A flat portion 11 extends in the major axis direction of an ellipse or ellipse formed by the outer periphery of the cone-shaped diaphragm 10. The area represented by hatching in FIG. X-X ′ in FIG. 2A is the long axis of an ellipse or an ellipse formed by the outer periphery of the cone-shaped diaphragm 10. FIG. 2B is a cross-sectional view taken along the line X-X ′ of FIG. Thus, in the long axis direction of the ellipse or ellipse where the outer periphery of the cone-shaped diaphragm 10 is formed, the cone-shaped diaphragm 10 has a flat portion 11 in the vicinity of the inner periphery and an inclined portion 12 on the outer side. The vicinity of the inner periphery means a portion connected to the voice coil 50 and the vicinity thereof. Such a flat part 11 contributes to increasing the sound pressure in the high sound range by increasing its rigidity.

  The flat portion 11 may extend not only in the major axis direction of the ellipse or ellipse but also in the periphery thereof. However, preferably, the flat portion 11 does not exist in the minor axis direction of an ellipse or an ellipse formed by the outer periphery of the cone-shaped diaphragm 10. Y-Y 'in FIG. 2A is an ellipse or ellipse minor axis formed by the outer periphery of the cone-shaped diaphragm 10. FIG. 2C is a cross-sectional view taken along the line Y-Y ′ of FIG. As described above, the cone-shaped diaphragm 10 is preferably formed only of the inclined portion 12 in the minor axis direction of an ellipse or an ellipse formed by the outer periphery of the cone-shaped diaphragm 10. In other words, it is preferable that the inclined portion 12 is directly connected to the voice coil 50 in the minor axis direction of an ellipse or an ellipse formed by the outer periphery of the cone-shaped diaphragm 10. With such a preferable form, the inclined portion 12 directly connected in the minor axis direction of an ellipse or an ellipse formed by the outer periphery of the cone-shaped diaphragm 10 supports the flat portion 11, and the rigidity of the flat portion 11 is further increased. Thus, the sound pressure can be further improved in the high sound range.

  The shape of the flat part 11 is not particularly limited. Preferably, as shown in FIG. 2A, the flat part 11 has an ellipse, and the major axis and the minor axis of the ellipse formed by the flat part 11 are The major axis and the minor axis of the ellipse or ellipse formed by the outer periphery of the cone-shaped diaphragm 10 respectively coincide with each other. Preferably, the minor axis of the ellipse formed by the flat portion 11 coincides with the diameter of the voice coil 50.

  The length of the flat portion 11 extending in the major axis direction of an ellipse or an ellipse formed by the outer periphery of the cone-shaped diaphragm 10 is not particularly limited. The length b in FIG. 2A is the length in the major axis direction of an ellipse or ellipse formed by the cone-shaped diaphragm 10 in the flat portion 11 of the cone-shaped diaphragm 10. As clearly shown in FIG. 2A, in the present specification, the length b is defined as including a space portion in the cone-shaped diaphragm 10 on which the voice coil 50 is disposed. The length a in FIG. 2A is the diameter of the cylinder when the voice coil 50 is cylindrical. When the voice coil 50 is not cylindrical, the length a is the length of the voice coil 50 in the long axis direction. In consideration of increasing the rigidity of the flat portion 11 to further improve the sound pressure in the high sound range, ease of manufacture, mechanical strength, and the like, b / a is preferably 1.2 to 3.5. Preferably it is 1.5-2.0.

  A manufacturing method for providing the flat portion 11 to the cone-shaped diaphragm 10 is not particularly limited. For example, a method of manufacturing a cone-shaped diaphragm using a mold having a flat portion corresponding to the flat portion 11 is used. Can be taken.

  According to the preferred embodiment, the damper 30 supporting the voice coil 50 has a flat portion 31 and a bent portion 32, and the flat portion 31 of the damper and the flat portion 11 of the cone-shaped diaphragm 10 are bonded and fixed. FIG. 3 is a partial sectional view in the major axis direction of an ellipse or an ellipse formed by the outer periphery of the cone-shaped diaphragm 10 of the cone-shaped diaphragm and the damper. As shown in the figure, the flat part 31 of the damper 10 and the flat part 11 of the cone-shaped diaphragm are bonded and fixed, thereby further increasing the rigidity of the flat part 11 of the cone-shaped diaphragm and further increasing the sound pressure in the high frequency range. Improvement is achieved.

  The adhesion between the flat part 31 of the damper and the flat part 11 of the cone-shaped diaphragm is not particularly limited, and a conventionally known method can be used as appropriate.

  For other configurations of the speaker 1, conventionally known ones such as a manufacturing method, a material, and a shape can be appropriately used. For example, in the aspect of FIG. 1, a state in which the gasket 100 is provided inside the vicinity of the outer periphery of the frame 40 is illustrated. The speaker of the present invention may have such a gasket 100, and in the case of having a gasket, conventionally known techniques can be adopted as appropriate for the material and form thereof.

Example 1
A loudspeaker as shown in FIG. 1 and FIG.
Specifically, the major axis of the ellipse formed by the outer periphery of the frame 40 is 115 mm, the minor axis is 22 mm, the diameter of the cylindrical voice coil 50 is 9.3 mm, and the flat portion 11 of the cone-shaped diaphragm 10 is formed. Was an ellipse having a major axis of 16.5 mm and a minor axis of 9.3 mm.

(Comparative Example 1)
The speaker was manufactured in the same manner as in Example 1, except that the cone-shaped diaphragm 10 was not provided with a flat portion. In other words, the cone-shaped diaphragm 10 is provided from the voice coil 50 having a diameter of 9.3 mm toward the frame 40 so that the cone-shaped diaphragm 10 is all inclined.

(Sound pressure evaluation in the high range)
For each speaker obtained in Example 1 and Comparative Example 1, the sound pressure and impedance with respect to the frequency of sound were measured. FIG. 5 is a graph of the measurement result by the speaker of Example 1, and FIG. 6 is a graph of the measurement result by the speaker of Comparative Example 1. 5 and 6, the curve (a) shows the measurement result of the sound pressure with respect to the frequency, and the curve (b) shows the measurement result of the impedance with respect to the frequency.
In Comparative Example 1, which is a conventional speaker model, in a high sound range (for example, a frequency range of about 5 k to 8 kHz), the sound pressure decreased as the frequency increased, and reached 80 dBSPL. On the other hand, in such a high sound range, the loudspeaker of Example 1 maintained a high sound pressure of about 80 dBSPL, and the sound pressure decreased gradually with an increase in frequency.

  According to the present invention, the sound pressure in the high sound range can be increased in a speaker having the same external shape as the conventional one, and therefore, application to an acoustic device that reproduces more powerful sound in a small speaker is expected.

DESCRIPTION OF SYMBOLS 1, 2 Speaker 10 Cone-shaped diaphragm 11 Flat part 12 Inclined part 20 Edge 30 Damper 31 Flat part 32 Bending part 40 Frame 50 Voice coil 60 Dust cap 70 Magnet 80 Yoke 90 Plate 100 Gasket

Claims (4)

  A magnetic circuit body, a voice coil fitted in a gap of the magnetic circuit body, a frame coupled to the magnetic circuit body, and a cone-shaped diaphragm, and an inner peripheral portion of the cone-shaped diaphragm is a voice coil The outer peripheral part of the cone-shaped diaphragm is coupled to the frame via an edge, and the outer peripheral part of the cone-shaped diaphragm has an oval or elliptical shape. A speaker having a flat portion extending in a major axis direction of an ellipse or an ellipse, and the flat portion is parallel to a plane including the ellipse or ellipse.   The speaker according to claim 1, wherein the flat portion of the cone-shaped diaphragm does not extend in the minor axis direction of the ellipse or ellipse.   The damper according to claim 1 or 2, further comprising a damper for holding the voice coil, wherein a part of the damper is a flat part, and the flat part of the damper and the flat part of the cone-shaped diaphragm are bonded and fixed. speaker.   The voice coil is cylindrical with a diameter a, and b / a is 1.2 to 3.5, where b is the length of the flat portion of the cone-shaped diaphragm in the major axis direction of the ellipse or ellipse. The speaker according to claim 1.

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