JP2011211572A - Diaphragm for loudspeaker, and loudspeaker using the same - Google Patents

Abstract

The present invention relates to a track-type speaker diaphragm used in various acoustic devices and a speaker using the same, and reduces gap defects due to generation of abnormal noise due to unnecessary resonance of the diaphragm and occurrence of a rolling phenomenon.
An outer periphery of a diaphragm main body having a track-shaped outer shape is provided with an edge and a gasket formed integrally with the outer peripheral portion of the diaphragm main body using the same material as the edge. The edge width dimension of the planar shape of the edge of the semicircular arc part at both ends is minimized with the same dimension as the linear part and the edge width dimension of the maximum separation part from the linear part is maximized. In addition, the thickness of the cross-sectional shape of the edge of the track-shaped linear portion is set to a constant value, and the thickness of the cross-sectional shape of the edge of the semicircular arc portion at both ends of the track shape is constant. By having a portion provided with a material thickness difference so as to be thicker than the value, occurrence of abnormal noise due to unnecessary resonance of the diaphragm and gap failure can be reduced.
[Selection] Figure 1

Description

  The present invention relates to a speaker diaphragm used in various acoustic devices, and more particularly to a track-type speaker diaphragm used in a slim type speaker having a narrow side.

  Conventionally, this type of speaker diaphragm has a configuration as shown in FIGS.

  9 to 13 show a track type speaker diaphragm used in a conventional slim type speaker.

  FIG. 9 is a plan view of the track type speaker diaphragm, FIG. 10 is a cross-sectional view of the track type speaker diaphragm in the minor axis direction, and FIG. 11 is a diagram of the track type speaker diaphragm. FIG. 12 is an enlarged cross-sectional view of the main part in the minor axis direction, FIG. 12 is a cross-sectional view in the major axis direction of the track type speaker diaphragm, and FIG. 13 is an enlarged main part in the major axis direction of the track type speaker diaphragm. Cross-sectional views are respectively shown.

  As shown in FIGS. 9 to 13, reference numeral 7 denotes a track-type speaker diaphragm used for a slim type speaker, of which 7a is a diaphragm main body, and 7b is provided on the outer peripheral portion of the diaphragm main body 7a. 7c is a gasket further provided on the outer periphery of the edge 7b.

  Here, the edge 7b is often made of cloth or foam, and the gasket 7c provided on the outer periphery of the edge 7b is often made of resin or paper.

  In recent years, a speaker diaphragm of the type in which the diaphragm body 7a is inserted and the edge 7b and the gasket 7c are integrally formed has been used in order to improve productivity and assembly accuracy as described above.

  As prior art document information relating to the invention of this application, for example, Patent Document 1 and Patent Document 2 are known.

Japanese Unexamined Patent Publication No. 7-15793 Japanese Utility Model Publication No. 60-181993

  However, in the conventional configuration described above, for example, in a track-type speaker used for a large screen television and when high power input is desired, an abnormal sound due to an unnecessary resonance of the diaphragm is generated. And the rolling phenomenon of the diaphragm occurs, and this rolling phenomenon makes the vertical amplitude of the diaphragm and the voice coil coupled to the diaphragm unstable, so that the voice coil contacts the magnetic gap and the gap defect occurs. It had a problem of frequent occurrence.

  The cause of the occurrence of abnormal noise due to unnecessary resonance of the diaphragm and the occurrence of gap defects due to rolling phenomenon is as follows. First, regarding the occurrence of abnormal noise due to unnecessary resonance, the vicinity of both ends in the major axis direction of the track type diaphragm This is a fatal problem of the track type diaphragm that causes unnecessary resonance because the shape of the diaphragm is closer to a flat surface compared to the minor axis direction, thereby generating surface noise that is an abnormal sound. .

  That is, the shape of the diaphragm in the vicinity of both ends in the major axis direction of the track type diaphragm has a larger coupling angle with the voice coil than in the minor axis direction. The main cause of abnormal noise was the shortage and the increased distance from the voice coil.

  In addition, gap failures due to the rolling phenomenon are often due to uneven weight balance of the diaphragm and unevenness of the flexibility of the edge, and in particular, many of them occur as a seesaw phenomenon in the major axis direction of the track type diaphragm. It was.

  The unevenness of the weight balance of the diaphragm and the unevenness of the edge flexibility are due to variations in the flexibility and weight of the edge itself, and the amount of adhesive applied and the adhesive when the diaphragm body and the edge are joined. There were many that occurred due to variations in application position.

  Further, in addition to the above-described factors around the diaphragm, it may occur from around other driving systems such as dampers and driving systems such as magnetic circuits.

  Furthermore, in addition to the gap defect due to the occurrence of the rolling phenomenon of the diaphragm, there is also a problem that the fluttering defect that generates abnormal noises frequently occurs when the edge that is a part of the diaphragm contacts the frame. It was.

  SUMMARY OF THE INVENTION The present invention solves the above-described problems, and an object of the present invention is to provide a speaker diaphragm having a track-shaped outer shape that does not cause abnormal noise due to unnecessary resonance of the diaphragm or a gap defect due to the rolling phenomenon of the diaphragm. It is what.

  In order to achieve the above object, the present invention integrally forms an outer periphery of a diaphragm main body having a track-shaped outer shape, an edge, and a gasket on the outer peripheral part of the edge with the same material as the edge, and the outer peripheral part of the diaphragm main body. The planar width of the edge of the semicircular arc part at both ends of the track shape is minimized with the same dimension as the straight part and the joint part with the straight part. It is formed by successively varying the edge width dimension of the maximum separation portion from the coupling portion so as to be maximized, and the thickness of the cross-sectional shape of the edge of the track-shaped linear portion is made constant, while the both ends of the track shape The diaphragm for a speaker is configured to have a portion in which the material thickness difference is provided so that the material thickness of the cross-sectional shape of the edge of the semicircular arc portion becomes thicker than a certain value.

  With this configuration, the edge width dimension of the planar shape of the edge of the semicircular arc part at both ends of the track shape is minimized with the same dimension as that of the linear part and the maximum distance from the joint part with the linear part. In order to maximize the edge width dimension of the part, it is formed by successively varying it so that when the diaphragm is coupled to the speaker frame and amplified, the amplitude of the track type diaphragm is ensured and the linearity is improved. By having a portion that has a material thickness difference so that the material thickness of the cross-sectional shape of the edge of the semicircular arc part at both ends of the track shape can be made to be favorable amplitude, the thickness of the diaphragm Suppresses the occurrence of unwanted noise by using thick edges to prevent unwanted resonance, and especially suppresses the rolling phenomenon of the diaphragm that occurs as a seesaw phenomenon in the major axis direction of the track-type diaphragm. It is possible to prevent the gap failure.

  As described above, the speaker diaphragm of the present invention has the edge width dimension of the planar shape of the edge of the semicircular arc portion at both ends of the track shape, and the joint portion with the straight portion is minimized with the same dimension as the straight portion, It is formed by successively varying the edge width dimension of the maximum separation part from the joint part with the straight part so as to be maximized, and the material thickness of the cross-sectional shape of the edge of the track-shaped straight part is made constant, while the track By configuring the speaker diaphragm with a material thickness difference so that the material thickness of the cross-sectional shape of the edge of the semicircular arc part at both ends of the shape becomes thicker than a certain value, it is possible to achieve a normal space factor Reduces the occurrence of abnormal noise due to unnecessary resonance of the diaphragm, which is a fate of the shape that often occurs in speakers using a speaker diaphragm with an excellent track-shaped outer shape, and gap defects due to the rolling phenomenon of the diaphragm In which exhibits an excellent effect that it is Rukoto.

The top view of the diaphragm for speakers of the present invention Sectional drawing of the short axis direction of the speaker diaphragm of this invention The principal part expanded sectional view of the minor axis direction of the diaphragm for speakers of this invention Sectional drawing of the major axis direction of the diaphragm for speakers of this invention The principal part expanded sectional view of the major axis direction of the diaphragm for speakers of this invention The principal part expanded sectional view of the major axis direction of the diaphragm for speakers of this invention Sectional view of the speaker of the present invention Sectional view of the speaker of the present invention Plan view of a conventional speaker diaphragm Sectional view in the minor axis direction of a conventional speaker diaphragm An enlarged cross-sectional view of the main part of a conventional speaker diaphragm in the minor axis direction Sectional view in the major axis direction of a conventional speaker diaphragm An enlarged cross-sectional view of the main part of a conventional speaker diaphragm in the major axis direction

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
Hereinafter, the present invention will be described using the first embodiment.

  1 to 6 show a track-type speaker diaphragm of the present invention and an enlarged view of a main part thereof.

  FIG. 1 is a plan view of a track-type speaker diaphragm, FIG. 2 is a cross-sectional view of the track-type speaker diaphragm in the minor axis direction, and FIG. 3 is a diagram of the track-type speaker diaphragm. FIG. 4 is a cross-sectional view in the major axis direction of the track type speaker diaphragm, and FIGS. 5 and 6 are diagrams in the major axis direction of the track type speaker diaphragm. The principal part expanded sectional view is shown, respectively.

  As shown in FIGS. 1 to 6, reference numeral 27 denotes a track type speaker diaphragm used for a slim type speaker, of which 27a is a diaphragm main body and 27b is provided on the outer peripheral portion of the diaphragm main body 27a. 27c is a gasket further provided on the outer periphery of the edge 27b.

  Here, the diaphragm for a speaker according to the present invention has an edge 27b on the outer peripheral portion of the diaphragm main body 27a having a track-shaped outer shape, and a gasket 27c on the outer peripheral portion of the edge 27b with the same material as the edge. Provided integrally with the outer peripheral portion, the thickness of the cross-sectional shape of the edge of the track-shaped linear portion 27e is made constant, while the thickness of the cross-sectional shape of the edge of the semicircular arc portion 27f at both ends of the track shape is constant. A portion 27g provided with a material thickness difference so as to be thicker is formed.

  And in order to improve productivity and assembly accuracy, the diaphragm main body 27a is inserted and the edge 27b and the gasket 27c are integrally formed simultaneously.

  In this way, by inserting, it is possible to increase the coupling strength between the diaphragm main body 27a and the edge 27b as compared with simple joining, it is possible to withstand a larger input, and to realize further higher power. it can.

  And by integrally forming simultaneously, productivity can be improved and, as a result, cost reduction can be achieved.

  Next, FIG. 5 is an enlarged cross-sectional view of the major edge portion of the loudspeaker diaphragm of the present invention. The difference in material thickness of the edge cross-sectional shape of the semicircular arc portion 27f at both ends of the track shape is shown in FIG. This shows a state in which the vicinity of the outer peripheral portion of 27a is made thickest at a portion 27g provided with a material thickness difference so as to be thicker than a certain value, and the vicinity of the gasket is made thinnest.

  Here, as for the material thickness of the edge cross-sectional shape of the semicircular arc portion 27f at both ends of the track shape, a constant value of the material thickness of the cross-sectional shape of the edge of the track-shaped straight portion 27e even in the thinnest portion near the gasket. By configuring the same material thickness to be the same as or thicker, both ends in the major axis direction of the track-type diaphragm, where unnecessary resonance of the diaphragm is likely to occur, are suppressed by suppressing unnecessary resonance with thick edges. Gap failure by preventing the generation of sound, and further strengthening the support force by the edge of the major axis of the track type diaphragm, suppressing the rolling phenomenon of the diaphragm that occurs as the seesaw phenomenon in the major axis direction of the diaphragm Can be prevented.

  Further, as shown in FIG. 6, the edge shape near the outer peripheral portion of the diaphragm main body 27a is the thinnest, and the edge shape is the thickest at the portion 27g provided with a material thickness difference so that the vicinity of the gasket is thicker than a certain value. When a small input is applied when configured as a speaker, the diaphragm is likely to have a small amplitude due to the effect of the thinnest part in the vicinity of the outer periphery of the diaphragm main body 27a, and the transient characteristics are improved, while the excessive input is applied. Is applied to the both ends of the track-type diaphragm in the major axis direction due to the effect of the thickest part in the vicinity of the gasket, thereby suppressing unnecessary resonance with thick edges to prevent the generation of abnormal noise and vibration. By strengthening the supporting force of the plate, it is possible to suppress the occurrence of a rolling phenomenon of the diaphragm that occurs as a seesaw phenomenon in the major axis direction, thereby preventing a gap defect.

  Further, the width dimension of the portion 27g provided with the material thickness difference so as to be thicker than a constant value of the material thickness of the cross-sectional shape of the edge of the track-shaped straight portion 27e is minimized so that the joint portion with the straight portion is minimized. In order to form the necessary material thickness in the necessary part without incurring unnecessary weight increase, the width dimension of the maximum separation part from the joint part is continuously variable so as to be maximized. In addition, it is possible to suppress unnecessary resonance with high-precision edges at both ends in the major axis direction of the track-type diaphragm with high precision to prevent the occurrence of further abnormal noise, and to support the diaphragm with high precision. It is possible to further suppress the occurrence of the rolling phenomenon of the diaphragm, which occurs as a seesaw phenomenon in the major axis direction, and prevent gap defects.

  Of course, the portion 27g provided with the material thickness difference so as to be thicker than the constant value of the material thickness of the cross-sectional shape of the edge of the track-shaped linear portion 27e is effective only by being present regardless of its shape and size. Although it can be exhibited, by devising its shape and dimensions as described above, a further great effect can be exhibited.

  Then, by providing a step 27d over the entire circumference at the joint between the outer peripheral portion of the edge 27b and the inner peripheral portion of the gasket 27c, it is a movable portion when the diaphragm is coupled to the speaker frame and amplified. The outer periphery of the edge 27b can be separated from the frame by a dimension corresponding to the step 27d, and the edge 27b, which is a movable part, comes into contact with the speaker frame, or the contact with the protruding adhesive comes into contact. Can be prevented.

  Here, if the step 27d is 0.5 mm or more, a sufficient effect can be obtained.

  If the level difference 27d is 0.5 mm or less, the effect of reducing the adhesive displacement between the roll outer peripheral portion of the edge and the frame is reduced, and if it is set too large, the effect of preventing the generation of hitting sound is enhanced. The overall height of the speaker also increases, making it difficult to reduce the thickness.

  Also, when mounted on a loudspeaker with a large applied input, it is excessive when the loudspeaker is configured as a loudspeaker by making the edge shape near the outer periphery of the diaphragm body the thinnest around the gasket. Even when input is applied, the effect of the thickest part in the vicinity of the outer periphery of the diaphragm body causes both ends of the long-diameter direction of the track type diaphragm to suppress unnecessary resonance with thick material edges and to generate abnormal noise. In addition, the support of the diaphragm is strengthened by the effect of the thickest part near the outer periphery of the diaphragm body, and the occurrence of rolling phenomenon of the diaphragm that occurs as a seesaw phenomenon in the major axis direction is also suppressed, resulting in a gap defect Can be prevented.

  Furthermore, by constituting the diaphragm main body from a papermaking diaphragm, it is possible to improve the degree of freedom of characteristics and sound quality, and to obtain a speaker diaphragm capable of producing characteristics and sound that meet market needs.

  On the other hand, by constituting the diaphragm main body from a resin diaphragm, it is possible to obtain a speaker diaphragm having high productivity, high degree of design freedom and accuracy of the diaphragm shape, and excellent moisture resistance and water resistance reliability.

  Here, by using a material made of bamboo for the papermaking diaphragm or resin diaphragm, the strength of the diaphragm can be improved due to its physical properties, and good sound quality, quality and reliability can be improved. In addition, good environmental response can be realized.

  Therefore, in addition to the above-mentioned edge shape effect, by improving the diaphragm as well, it is possible to achieve great synergies with improved characteristics and sound quality, improved quality and reliability, improved productivity and environmental friendliness. Can do.

  Further, by constituting the edge and the gasket from a polymer material, it is possible to obtain a speaker diaphragm having excellent flexibility and elasticity of the polymer material and linearity due to its own elongation.

  In this way, by configuring from a polymer material rich in flexibility, the original sound reproduction ability of the edge is improved and a gasket is integrally configured using the same polymer material rich in flexibility. If there is a gasket that has been used as, it is possible to reduce this, and it is also possible to achieve a cost reduction effect by improving productivity and reducing the number of parts.

  Here, as a polymer material, a rubber-based material is used as a representative, and a soft synthetic resin-based material, a synthetic fiber-based material, or a cellulose-based material is used, and frequently used materials include SBR, NBR, and elastomer. It is desirable that the selection be made in consideration of the flexibility and sound quality characteristics according to the usage requirements.

  In addition, by configuring the edges and gaskets from foamed material, the low density and high internal loss of foamed materials, improved sound quality due to weight reduction, improved frequency characteristics due to reduced edge resonance, and further improved sound pressure level An excellent speaker diaphragm that can be improved can be obtained.

  Here, the foamed material includes foamed rubber, foamed elastomer, and the like, and it is desirable to select the foamed material in consideration of the foaming ratio and the characteristics of the material properties in accordance with the respective usage requirements.

(Embodiment 2)
Hereinafter, the present invention will be described using the second embodiment.

  7 and 8 are cross-sectional views of the speaker according to Embodiment 2 of the present invention.

  As shown in FIG. 7, a magnetized magnet 21 is sandwiched between an upper plate 22 and a yoke 23 to constitute an internal magnet type magnetic circuit 24.

  A frame 26 is coupled to the yoke 23 of the magnetic circuit 24. The outer periphery of the diaphragm 27 according to claim 1 is bonded to the peripheral portion of the frame 26.

  One end of the voice coil 28 is coupled to the central portion of the diaphragm 27 and the opposite end is coupled so as to fit into the magnetic gap 25 of the magnetic circuit 24.

  In the above, the speaker having the inner magnet type magnetic circuit 24 has been described. However, the present invention is not limited to this, and the present invention may be applied to a speaker having an outer magnet type magnetic circuit as shown in FIG.

  With this configuration, as described in the first embodiment, the portion of the diaphragm in the vicinity of the both ends of the track where the unnecessary resonance is likely to occur is suppressed by the thick material edge to prevent the generation of abnormal noise. It is possible to reduce gap defects due to the rolling phenomenon of the diaphragm having the shape.

  Therefore, due to generation of abnormal noise due to unnecessary resonance of the diaphragm, which is a fate of shape that is often generated in speakers using a speaker diaphragm having a track-shaped outer shape with excellent space factor, or due to the rolling phenomenon of the diaphragm A gap defect can be reduced.

  Further, productivity can be improved, and the speaker can be excellent in terms of environment and cost.

  This effect is particularly effective for a speaker having a rectangular shape or a track-shaped outer shape with a large aspect ratio of the speaker aperture using a speaker diaphragm having a track-shaped outer shape. It is also possible to increase the power of the speaker having the.

  The loudspeaker diaphragm according to the present invention can be applied to a loudspeaker having a rectangular shape or a track-shaped outer shape that reduces occurrence of abnormal noise due to unnecessary resonance of the diaphragm or gap failure due to a rolling phenomenon of the diaphragm.

7 Diaphragm 7a Diaphragm body 7b Edge 7c Gasket 21 Magnet 22 Upper plate 23 Yoke or lower plate 24 Magnetic circuit 25 Magnetic gap 26 Frame 27 Diaphragm 27a Diaphragm body 27b Edge 27c Gasket 27d Step 27e Track-shaped linear part 27f Track Semicircular arc part of both ends of the shape 28 Voice coil

Claims (12)

A loudspeaker diaphragm provided on the outer periphery of a diaphragm main body having a track-shaped outer shape, with an edge and a gasket formed integrally with the outer periphery of the diaphragm main body using the same material as that of the edge. In the speaker diaphragm, the edge width dimension of the planar shape of the edge of the semicircular arc part at both ends of the track shape is minimized so that the joint part with the straight part is the same dimension as the straight part. In order to maximize the edge width dimension of the maximum separation portion from the coupling portion with the joint portion, the thickness of the cross-sectional shape of the edge of the track-shaped linear portion is set to a constant value, and the track A loudspeaker diaphragm having a portion in which a material thickness difference is provided so that the material thickness of the cross-sectional shape of the edge of the semicircular arc portions at both ends of the shape is larger than the predetermined value. The width dimension of the part where the material thickness difference is set to be thicker than a certain value, the coupling part with the straight part is minimized, and the width dimension of the maximum separation part from the coupling part with the linear part is maximized The loudspeaker diaphragm according to claim 1, wherein the diaphragm is formed by being continuously variable. The speaker diaphragm according to claim 1, wherein a step is provided over the entire circumference at a joint portion between the outer peripheral portion of the edge and the inner peripheral portion of the gasket. The speaker diaphragm according to claim 1, wherein the material thickness difference between the edge cross-sectional shapes of the semicircular arc portions at both ends of the track shape is formed such that the vicinity of the outer peripheral portion of the diaphragm main body is the thickest and the vicinity of the gasket is the thinnest. The speaker diaphragm according to claim 1, wherein the material thickness difference between the edge cross-sectional shapes of the semicircular arc portions at both ends of the track shape is formed such that the vicinity of the outer peripheral portion of the diaphragm main body is the thinnest and the vicinity of the gasket is the thickest. 2. The loudspeaker diaphragm according to claim 1, wherein the outer peripheral portion of the diaphragm main body is insert-molded. 2. The loudspeaker diaphragm according to claim 1, wherein the diaphragm main body is a papermaking diaphragm. 2. The loudspeaker diaphragm according to claim 1, wherein the diaphragm main body is made of a resin diaphragm. 2. The speaker diaphragm according to claim 1, wherein the edge and the gasket are made of a polymer material. 2. The speaker diaphragm according to claim 1, wherein the edge and the gasket are made of a foam material. 2. The loudspeaker diaphragm according to claim 1, wherein the edge and the gasket are integrally formed simultaneously with the diaphragm main body. A frame coupled to the magnetic circuit; a speaker diaphragm according to claim 1 coupled to an outer periphery of the frame; and a portion of the diaphragm coupled to the speaker diaphragm and a magnetic gap of the magnetic circuit. A speaker composed of arranged voice coils.

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