JP2002034097A - Loudspeaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a loudspeaker which suppresses the generation of the undesired resonance of a slender loudspeaker especially such as, a nearly rectangular loudspeaker, an oval-shaped loudspeaker or the like, regarding the loudspeaker which is used for a video apparatus and an acoustic apparatus. SOLUTION: In the loudspeaker, planar parts 20a, which are bonded and coupled to opposite side face parts 14a in the major-axis direction of a diaphragm 14 by straight lines 20b and which are formed in the minor-axis direction, are installed at a subcone 20, and the strength in the major-axis direction of the diaphragm 14 is enhanced. Thereby, the unwanted resonance is suppressed, and the disorder in frequency characteristics and the generation of abnormal sounds or the like due to the face judder of a cone are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker used for various kinds of audio equipment.

[0002]

2. Description of the Related Art FIG.
This will be described with reference to FIG.

FIG. 8A is a plan view of an elliptical speaker, which is a kind of a conventional elongated speaker such as an ellipse or a track, and FIG. 8B is a sectional side view of the shorter speaker.

According to FIG. 1, an oblong frame 8 is provided on the upper plate 1 of the magnetic circuit 6 constituted by sandwiching a magnet 2 between an upper plate 1 and a lower plate 3 and connecting a cancel magnet 4 and a shield cover 5 therebelow. And an elliptical diaphragm 14 having an edge 13 coupled to the outer periphery of the cone 12 at the periphery of the frame 8 and adhesively coupled together with a gasket 15 to the middle of the voice coil 10 for driving the diaphragm 14. The diaphragm 14 is held at the center by the damper 9 and is fitted into the magnetic gap 7.
Of the voice coil 10 and a sub-cone 16 by adhesive bonding.

The purpose of the present invention is to correct the middle and high frequency range by using the sub-cone 16 described above.

[0006]

However, the above-mentioned elongated speaker having an oval shape, a substantially rectangular shape, an elliptical shape, or the like has a thin and lightweight cone 12 for the purpose of improving the sound pressure level. In the case where the diaphragm 14 has an amplitude, unnecessary resonance occurs in the cone portion 12 to disturb the frequency characteristics or is severe when the vibration plate 14 oscillates. In the case of, poor quality such as abnormal sound due to the surface squeal of the cone portion 12 is likely to occur on the side surface of the cone portion 12 in the long diameter direction.

In a conventional elongated speaker such as an ellipse, a rectangle or an ellipse, the opening angle of the cone portion 12 in the longitudinal direction becomes obtuse from the cone shape, and the speaker frequency characteristic is low in the sound pressure level in the middle and high ranges. Performance tended to be.

[0008]

According to a first aspect of the present invention, there is provided a loudspeaker comprising a magnetic circuit having at least a magnetic gap, an elongated frame coupled to the magnetic circuit. An elongated diaphragm coupled to the periphery of the frame and having a voice coil fitted into the magnetic gap at the center, and a lower end coupled to a tip of a bobbin of the voice coil; A speaker comprising a sub-cone coupled to a long-diameter side surface portion, wherein the sub-cone is formed from a flat portion provided in a short-diameter direction linearly coupled to a side surface portion facing each other in a long-diameter direction of the diaphragm. As in the above configuration, by forming a flat portion on the surface in the minor diameter direction of the sub-cone, unnecessary resonance of the cone portion of the diaphragm can be prevented. The easily occurs partial squeaking sterically reinforced subcone, is capable of providing excellent speaker frequency characteristic which prevents the unnecessary resonance and surface squeal restrict the vibration.

According to a second aspect of the present invention, the sub-cone connecting the side surfaces facing each other in the major diameter direction of the diaphragm is substantially perpendicular to the major surface side portion of the sub-cone. The reinforcing ribs are provided in the direction of the diaphragm, and the strength can be further improved in the minor axis direction of the diaphragm, unnecessary resonance can be prevented, and flattening of frequency characteristics and low distortion can be achieved. is there.

According to a third aspect of the present invention, a positioning rib is provided on a side surface to which the sub-cone in the longitudinal direction of the diaphragm according to the first or second aspect is coupled.
Reinforcement of the side surface in the major axis direction of the diaphragm and positioning of the sub-cone become easy, and if a plurality of pairs of positioning ribs are provided as appropriate according to the size and opening angle of the sub-cone, the required mid-high range characteristics The combined use of the sub-cone becomes possible, and the diaphragm can be shared.

According to a fourth aspect of the present invention, there is provided a speaker provided with a sub-cone, wherein the sub-cone has a flat portion in a short-diameter direction which connects the shape of the sub-cone with a straight line between mutually facing side portions in the long-diameter direction of the diaphragm. In addition, the sub-cone between the connecting portion of the diaphragm and the side surface of the diaphragm in the major axis direction is substantially deleted, and a portion where unnecessary resonance or surface squeal of the cone portion of the diaphragm is likely to occur is three-dimensionally formed. It can provide a speaker with excellent frequency characteristics that reinforces the joint and restricts vibration to prevent this unnecessary resonance and surface squeal.Furthermore, the surface of the sub-cone connecting the side faces of the diaphragm facing in the long diameter direction should be a straight plane. In addition to the features of claim 1, the shape has a three-dimensional structure that bridges at an angle substantially perpendicular to the side surface of the diaphragm, so that the strength in the major axis direction can be improved. , In which the sound pressure level increase of the intermediate and high frequency sound can lighter pressure drop is less because there is no cone portion on the short diameter side becomes possible.

According to a fifth aspect of the present invention, a plurality of sets of positioning ribs having different angles are provided on the long side surface of the diaphragm connecting the sub-cone of the speaker according to the fourth aspect, Since the coupling between the sub-cone and the diaphragm can be appropriately selected and coupled among the positioning ribs,
The opening angle of the sub-cone can be changed by this selection, and the mid-high range characteristics of the speaker can be changed according to the desired sound quality.

[0013]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIGS.

The same parts as those in the prior art are denoted by the same reference numerals, and description thereof will be omitted.

(Embodiment 1) FIG.
FIG. 1A is a plan view of an oblong speaker, which is a kind of an elongated speaker according to an embodiment, and FIG. 2 is an enlarged cross-sectional view of the same minor diameter side, and FIG. 2 is a sound pressure frequency characteristic diagram.

Only the differences from the prior art will be described with reference to the figure. Reference numeral 20 denotes a sub-cone, the lower end of which is adhesively bonded to the tip 11 of the voice coil 10. Reference numeral 20a denotes a plane portion of the sub-cone 20 provided in the minor diameter direction and linearly coupled to the side surface portion 14a facing the major diameter direction of the diaphragm 14. That is, the sub-cone 20 is circular near the connection with the tip 11 of the bobbin of the voice coil 10 and has a substantially rectangular shape toward the opening tip direction (a substantially arc shape in the major axis direction).

The sub-cone 20 has a flat portion 2 on the minor diameter side.
A straight line 20b is formed at the corner between 0a and the major diameter side,
On this substantially straight line 20b, it is adhesively bonded to the side surface portion 14a of the diaphragm 14.

As described above, the diaphragm 14 and the sub-cone 20
In this configuration, the short-diameter direction of the diaphragm 14 is bridged by the flat portion 20a of the sub-cone 20 so that unnecessary resonance or surface squeal in the long-diameter direction of the cone portion 12 of the diaphragm 14 can be reduced. The present invention is capable of providing a loudspeaker reinforced three-dimensionally and having excellent frequency characteristics in which vibration is limited and unnecessary resonance and surface squeal are prevented.

FIG. 2 shows a speaker a (16 ×) of the present embodiment.
This is a comparison of the frequency sound pressure characteristics of a 4.2 cm oval speaker (indicated by a solid line) and a conventional speaker b (indicated by a dashed line). According to this figure, the resonance of the present embodiment is unnecessary. Was significantly suppressed, the peak and dip were reduced, and a flat frequency characteristic was obtained.

It has also been separately confirmed that the distortion value around the resonance frequency is 16% of the conventional one and 3.5% in the case of the present embodiment.

(Embodiment 2) FIG.
FIG. 3 illustrates an embodiment of the present invention.
FIG. 3A is a plan view of a speaker according to another embodiment of the present invention, and FIG. 3B is an enlarged cross-sectional view of the same minor diameter side.

Only the differences from the first embodiment will be described with reference to FIG. 2. Reference numeral 20c denotes a reinforcing rib provided in the flat portion 20a so as to be substantially perpendicular to the side surface portion 14a of the diaphragm 14.

The reinforcing ribs 20c are formed at the same time when the sub-cone 20 is formed. Thereby, the strength of the diaphragm 14 in the major axis direction can be improved as compared with the first embodiment.

(Embodiment 3) FIG.
An embodiment of the present invention will be described.

FIG. 4 (a) is a plan view of a speaker according to another embodiment of the present invention, and FIG. 4 (b) is an enlarged cross-sectional view of the same minor diameter side.

Only the differences from the first embodiment will be described with reference to FIG. 2. A plurality of sets 14b are provided on the diaphragm 14 in a straight line in the vicinity of each corner of the sub-cone 20 from the inner circumference to the outer circumference. It is a positioning rib. Sub cone 20
Are the positioning ribs 14 corresponding to the straight line 20b of the corner.
b, and is adhesively bonded. The adhesive bonding is such that the positioning rib 14b and the sub-cone 20 can be extremely easily determined and adhesively bonded along the straight line 20b of the corner. .

Further, by providing a plurality of sets of positioning ribs 14b corresponding to the sub-cones 20 having different opening angles prepared according to the required acoustic characteristics on the diaphragm 14, the mounting of the sub-cones 20 can be performed by the positioning ribs 14b. Can be appropriately selected, so that the productivity of the speaker can be improved and the diaphragm 14 can be shared.

(Embodiment 4) FIG.
An embodiment of the present invention will be described. FIG.
FIG. 5A is a plan view of a speaker according to another embodiment of the present invention, and FIG. 5B is an enlarged cross-sectional view of the same minor diameter side, and FIG.
Is a sound pressure frequency characteristic diagram.

Only the points different from the first embodiment will be described with reference to FIG. 2. The inner periphery 21 is connected to the voice coil 10 side, is extended in the major axis direction around this center, and has a flat portion 21c in the minor axis direction. It is an almost butterfly-shaped sub-cone.

The sub-cone 21 is adhesively bonded to the side surface portion 14a so as to form a flat portion 21a in the short diameter direction connecting the side portions 14a facing each other in the major diameter direction of the diaphragm 14 in a straight line. The reinforcement in the major diameter direction is performed in the same manner as in the first embodiment, and the weight of the sub-cone 21 is reduced.

The sub-cone 21 is substantially omitted in the minor axis direction as is apparent from the drawing.
The opening angle of 1 can be appropriately determined depending on the position of the adhesive connection with the diaphragm 14.

Reference numeral 21b denotes a reinforcing rib, which is provided in the direction of the minor axis to improve the strength of the sub-cone 21.

FIG. 6 shows a 16.times.
Sound pressure frequency characteristic a of 4.2 cm oval speaker
And a comparison of the sound pressure frequency characteristic b of a similar conventional speaker. As is clear from the figure, a flat frequency characteristic with a small peak dip was obtained, and it was confirmed that the sound pressure level in the middle and high ranges was improved.

(Embodiment 5) FIG.
An embodiment of the present invention will be described. FIG.
FIG. 7A is a plan view of a speaker according to another embodiment of the present invention, and FIG. 7B is an enlarged cross-sectional view of the same minor diameter side.

Only the differences from the fourth embodiment will be described with reference to FIG.
Positioning ribs are provided in plural directions in four directions for positioning the end of the butterfly-shaped sub-cone 21 on a and adhering the sub-cone 21 to the side surface portion 14a of the diaphragm 14.

Since a plurality of pairs of positioning ribs 14c are provided, the opening angle which is a characteristic of the butterfly-shaped sub-cone 21 can be changed until it is coupled to the diaphragm 14. Therefore, an appropriate positioning rib 14c is selected and the sub-cone 21 is selected. And diaphragm 1
Adhesive bonding of 4 allows the provision of a loudspeaker in accordance with the required acoustic characteristics without using a combination of the dies of the diaphragm 14 and the sub-cone 21 and preparing the loudspeakers in common, thereby suppressing an increase in cost due to an increase in dies. You can do it.

[0037]

As described above, according to the present invention, the rigidity of the elongated speaker in the major axis direction can be improved by the sub-cone, and the frequency characteristic can be flattened without increasing the number of parts. The object of the present invention is to provide a wide-band, high-quality speaker with little distortion.

[Brief description of the drawings]

FIG. 1A is a plan view of an oblong speaker, which is a kind of an elongated speaker according to an embodiment of the present invention, and FIG.

FIG. 2 is a sound pressure frequency characteristic diagram

FIG. 3A is a plan view of an oblong speaker, which is a kind of an elongated speaker according to another embodiment, and FIG.

FIG. 4A is a plan view of a speaker according to another embodiment of the present invention, and FIG.

5A is a plan view of a speaker according to another embodiment of the present invention, and FIG.

FIG. 6 is the same sound pressure frequency characteristic diagram

FIG. 7A is a plan view of a speaker according to another embodiment of the present invention, and FIG.

8A is a plan view of a kind of a conventional elongated speaker having an oval shape. FIG. 8B is an enlarged cross-sectional view of the same short diameter side.

[Explanation of symbols]

 Reference Signs List 6 Magnetic circuit 7 Magnetic gap 8 Frame 10 Voice coil 14 Diaphragm 14a Side surface 14b, 14c Positioning rib 20, 21 Sub-cone 20a, 21a Flat surface 20c Reinforcing rib

Claims (5)

[Claims] A magnetic circuit having at least a magnetic gap; an elongated frame coupled to the magnetic circuit;
A loudspeaker comprising an elongated diaphragm coupled to a peripheral edge of the frame and having a voice coil fitted into the magnetic gap at the center, and a sub-cone having a lower end coupled to a tip of a bobbin of the voice coil. A speaker comprising a flat portion provided in a minor diameter direction, wherein the sub-cone is linearly coupled to side surfaces of the diaphragm facing each other in a major diameter direction. 2. The sub-cone connecting the side surfaces of the diaphragm facing each other in the major diameter direction, wherein a reinforcing rib in a direction substantially orthogonal to the major surface of the diaphragm is provided on the minor surface of the sub-cone. The described speaker. 3. A positioning rib is provided on a side surface to which a sub-cone in the major diameter direction of the diaphragm is connected.
Speaker. 4. An elongated circuit comprising a magnetic circuit having a magnetic gap, an elongated frame coupled to the magnetic circuit, and a voice coil coupled to a peripheral edge of the frame and fitted at the center to the magnetic gap. And a sub-cone coupled to a tip of a bobbin of the voice coil and a side surface of the diaphragm in a long diameter direction, wherein the sub-cone is a side surface facing each other in a long diameter direction of the diaphragm. A loudspeaker having a flat portion in the minor diameter direction connecting the portions with a straight line, and having substantially no sub-cone between the side portion of the diaphragm and the connecting portion of the sub-cone in the major diameter direction. 5. The loudspeaker according to claim 4, wherein a plurality of sets of positioning ribs having different angles are provided on a side surface of the diaphragm connecting the sub-cone in the major diameter direction.