JP4569531B2 - Sound wave output mechanism - Google Patents

Description

  The present invention relates to a technology of a sound wave output mechanism such as a speaker or a passive diaphragm.

  Edges for supporting the speaker cone paper and the passive diaphragm so as to freely vibrate are attached. This edge is provided between the speaker frame and the outer periphery of the cone paper, or between the periphery of the opening hole provided in the speaker enclosure and the outer periphery of the passive diaphragm.

  Here, FIG. 9A is a diagram showing a configuration of a corner portion of a conventional edge used in a flat speaker. Reference numeral 1 shown in FIG. 9A denotes a diaphragm for a flat speaker, which is constituted by a flat plate member. The diaphragm 1 is moved back and forth in the normal direction of the surface thereof when a driving force of a voice coil (not shown) is transmitted. An edge 2 is attached along the outer periphery of the diaphragm 1, and the diaphragm 1 is supported by the edge 2 so as to freely vibrate from a speaker frame (not shown).

  The edge 2 is folded along a predetermined fold, and the vibration of the diaphragm 1 is enabled by changing the degree of bending with respect to the fold.

  FIG. 10 is a diagram illustrating an example of a method for manufacturing the corner portion of the edge 2. As illustrated, lines L1 to L3 parallel to the long side are drawn at equal intervals on a rectangular sheet member (Japanese paper or the like). Next, a 45 ° line is drawn downward from approximately the center of the left long side toward the line L1, and a 45 ° line is drawn upward from the intersection of the line and the line L1 toward the line L2. A 45 ° line is drawn downward from the intersection of this line and the line L2 toward the line L3, and a 45 ° line is drawn upward from the intersection of this line and the line L3 toward the right long side.

  In the above state, as shown in the figure, when the lines L1 to L3 are alternately divided into a solid line and a broken line, the solid line is folded in a mountain, and the broken line is folded in a valley, the corner shown in FIG. 9A is completed. By making four corner portions and combining them, the edge 2 becomes a rectangular frame, and the periphery of the rectangular diaphragm 1 is supported. Here, FIG. 11 is the figure which looked at the corner part from the front. In addition, the front said here means the surface seen from the same direction as the front of the diaphragm 1, and the X-axis and Y-axis in this front are shown in the same figure. FIG. 12 shows a state where the corner portion is viewed from the Y-axis direction. FIG. 12 shows a state when the edge 2 is opened to the maximum (when the bending and stretching with respect to the fold line is most extended).

  The state shown in FIG. 9A described above shows a state in which the edge 2 is most folded, that is, a state in which the bending with respect to the fold is the largest. When the diaphragm 1 is driven and protrudes in front of the front, the fold is bent and the state shown in FIG. 9B is obtained, and further, the diaphragm 1 protrudes in front of the front and has the least bent with respect to the fold. FIG. 9 (c) shows the time. The diaphragm 1 can vibrate within a range of strokes until the edge 2 changes from the state shown in FIG. 9A to the state shown in FIG. 9C.

  However, in the conventional edge 2, as shown in FIG. 9 (c), when the bending / stretching stroke is increased, irregular corner deformation (V A character-shaped portion cv) was generated. Since this deformation causes abnormal noise, there arises a problem that the bending stroke of the edge 2 cannot be taken very large. As a result, there is a disadvantage that the amplitude of the diaphragm 1 cannot be increased and a loud speaker cannot be produced.

  On the other hand, Patent Document 1 describes an edge that can be used for an oval or rectangular speaker. A large number of pleats regularly arranged in the circumferential direction are formed in the corner portion of the edge, and the pleats can easily wrinkle in the circumferential direction so that the vibration amplitude of the cone paper of the speaker can be increased.

  However, in the edge described in Patent Document 1, since the pleat is formed in the extending direction of the surface of the cone paper (member corresponding to the diaphragm), even if the structure is easily wrinkled, The stroke that can be absorbed by wrinkles in the extending direction of the surface is not so large. In addition, since a large number of pleats must be formed, there is a problem that the structure becomes complicated.

Japanese Patent Laid-Open No. 10-257590

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a sound wave output mechanism having an edge that has a simple structure and can take a large vibration amplitude of a diaphragm.

In order to solve the above-described problems, the present invention has a rectangular outer periphery, which emits a sound wave by receiving energy from a vibration source and vibrates, and between the outer peripheral portion of the diaphragm and a fixing member. A sheet-like member provided along the outer peripheral portion, and the sheet-like member bends along a predetermined crease in a linear portion along the side of the square, and the degree of bending and stretching with respect to the crease is By changing, the diaphragm is supported so as to freely vibrate, and at the corner of the sheet-like member corresponding to the corner of the outer periphery of the diaphragm, the corner provided on the diaphragm side and the fixed member side An opening / closing structure that connects the provided corner, and the opening / closing structure includes a crease provided between a corner provided on the diaphragm side of the corner and a corner provided on the fixing member side. The diaphragm side and the fixed part It has a shape spreading in each direction of the side, spreading the degree of the opening and closing structure is characterized by having an edge member that varies in conjunction with the bending.

  In this case, the diaphragm may be a diaphragm of a flat speaker, the fixing member may be a speaker frame, the diaphragm is a passive diaphragm, and the fixing member constitutes one surface of a speaker enclosure. It may be a member. Further, the edge member may be integrally formed with the opening / closing structure.

Moreover, as a preferable aspect, the edge member opening / closing structure draws straight lines L10, L11, L12 parallel to the opposing long sides a, b at equal intervals with respect to the rectangular sheet member, and the long sides a, b Intersections between the virtual straight line connecting the midpoints and the straight lines L10, L12 are P1, P2, passing through the point P1, having an angle of 45 ° counterclockwise with respect to the line L10, and extending between the long side a and the line L11. A straight line L21 having an angle of 45 ° clockwise with respect to the straight line L20 and the line L10 is drawn, and a line L21 extending between the long side a and the line L11 is drawn, and a mountain fold is formed between the long side a of the straight lines L20 and L21 and the straight line L10. And a straight line L30 and a line L12 extending between the long side b and the straight line L11 with a 45 ° clockwise angle with respect to the straight line L12. It has an angle of 45 ° counterclockwise and a long side b and a straight line A straight line L31 extending between L11 is drawn, a mountain fold is formed between the long side b of the straight lines L30 and 31 and the straight line L12, a valley fold is formed between the straight lines L12 and L11, the point P1 is passed, and the straight line L10 is taken. A straight line L40 having an angle of 67.5 ° counterclockwise is drawn between the straight line L11 and the long side a, and a straight line L41 having an angle of 67.5 ° clockwise with respect to the straight line L10 is a straight line L11. a between the long side a of the straight lines L40 and 41 and the straight line L10, a valley fold between the straight lines L10 and L11, a mountain fold between the straight line L10 and the straight line L11, the point P2, and the right the straight line L50 having an angle around the 67.5 ° pull between the straight line L1 2 and the long side b, the straight line L12 and the long side a straight line L51 having an angle of 67.5 ° counterclockwise with respect to the straight line L12 Pull between b and fold between the long side b of straight lines L50 and 51 and straight line L12 And may be formed by making a mountain fold between the straight lines L11 and L12.

Embodiments of the present invention will be described below with reference to the drawings.
<Embodiment>
FIG. 1A is a perspective view showing the configuration of the present embodiment, and shows the appearance of the corner portion of the edge 10. 15 shown in the figure is a diaphragm for a flat speaker, and is constituted by a flat plate-like member having an internal honeycomb structure. The diaphragm 15 moves in parallel back and forth in the normal direction of the surface thereof when a driving force of a voice coil (not shown) is transmitted.

  Reference numeral 20 denotes a rectangular frame-like frame, and the outer shape thereof is formed so as to substantially coincide with the outer shape of the diaphragm 15. The edge 10 is attached between the diaphragm 15 and the frame 20 along the outer peripheral portion of the diaphragm 15. The edge 10 is folded along a predetermined fold, and the vibration of the diaphragm 15 is enabled by changing the degree of bending with respect to the fold.

  Next, in order to show the feature of the shape of the edge 10, a case where the edge 10 is formed from a rectangular sheet-like member (for example, Japanese paper) will be described as an example. FIG. 2 is a view showing a fold when one corner portion of the edge 10 is formed from a sheet-like member. In the figure, the solid line is a mountain fold (folds so that the front side of the drawing is convex), and the broken line is a valley fold ( Folded so that the back side of the drawing is concave). Next, an example of a method for forming each line shown in FIG. 2 will be described.

  First, straight lines L10, 11, and 12 parallel to the long sides a and b of the sheet-like member shown in FIG. 2 are drawn at equal intervals. Next, the intersections of the imaginary straight line connecting the midpoints of the long sides a and b and the straight lines L10 and L12 are P1 and P2, passing through the point P1, and having an angle of 45 ° counterclockwise to the line L10, A straight line L20 extending between the side a and the line L11 and a line L21 extending 45 degrees clockwise with respect to the line L10 and extending between the long side a and the line L11 are drawn. A straight line (mountain fold) is defined between the long side a of the straight lines L20, 21 and the straight line L10, and a broken line (valley fold) is defined between the straight lines L10 and L11. Similarly, it passes through the point P2, has an angle of 45 ° clockwise with respect to the straight line L12, and has an angle of 45 ° counterclockwise with respect to the straight line L30 extending between the long side b and the straight line L11 and the line L12. A straight line L31 extending between the long side b and the straight line L11 is drawn. Then, a solid line (mountain fold) is defined between the long side b of the straight lines L30 and 31 and the straight line L12, and a broken line (valley fold) is defined between the straight lines L12 and L11.

Next, a straight line L40 passing through the point P1 and having an angle of 67.5 ° counterclockwise with respect to the straight line L10 is drawn between the straight line L11 and the long side a, and 67.5 clockwise with respect to the straight line L10. A straight line L41 having an angle of ° is drawn between the straight line L11 and the long side a. A straight line (valley fold) is defined between the long side a of the straight lines L40 and 41 and the straight line L10, and a solid line (mountain fold) is defined between the straight line L10 and the straight line L11. Similarly, through the point P2, Pull between the straight line L1 2 and the long side b of the straight line L50 having an angle of 67.5 ° clockwise with respect to the straight line L12, counterclockwise with respect to the straight line L12 A straight line L51 having an angle of 67.5 ° is drawn between the straight line L12 and the long side b . A portion between the long side b of the straight lines L50 and 51 and the straight line L12 is a broken line (valley fold), and a portion between the straight lines L11 and L12 is a solid line (mountain fold). And the corner part of the edge 10 as shown to Fig.1 (a) is formed by making the broken line shown in FIG. 2 into a valley fold, and making a continuous line into a mountain fold. By creating four corner portions and combining them into a rectangular frame shape, a frame-shaped edge 10 that supports the outer periphery of the diaphragm 15 is formed.

  Next, an example of forming the straight line as described above in the manner of origami will be described with reference to FIG. First, a rectangular sheet (Japanese paper or the like) is prepared (see FIG. 5A), and is folded in half as shown in FIG. 5B. Then, the front side is folded in half (see FIG. 5C), and the opposite side is folded in half in the same manner (see FIG. 5D).

  Next, the right portion is folded at a right angle at a half position of the elongated sheet (see FIG. 5E). The vertex that is formed when folded at a right angle in this way becomes the vertex of the corner portion. Similarly, the left part is also folded at a right angle (see FIG. 5F). Then, the sheet is opened at one end (see FIG. 5G) and folded so that the upper edge on the right side matches the crease. The left side is also folded in the same manner (see FIG. 5 (i)). When it is opened again (see FIG. 5 (j)), this time, the sheet is completely opened to the original state. When the sheet is opened in this way, each line shown in FIG. 2 is formed on the sheet. Next, a solid line and a broken line shown in FIG. 2 are applied to each crease formed in the sheet, and a mountain fold and a valley fold are performed in accordance with this, and the central portion is made convex (FIG. 5 (k)). FIG. 5 (l) is a diagram showing a case where the state shown in FIG. 5 (k) is viewed from the back side. As shown in FIG. 5, the central portion is convex on the front side and the left and right sides are folded on the back side. Then, as shown in FIG. 5 (m), when viewed from the back side, the folds appear to the left and right with the central portion as a boundary, but are folded so as not to be pinched by the central portion. If it does in this way, as shown in FIG.5 (n), when it sees from the front side, the beak-shaped opening-and-closing structure 10a will be formed in the corner | angular part of the sheet | seat folded as a whole as a whole. Four corner portions shown in this figure are created, and the edges 10 forming a rectangular frame are formed by connecting them into a square shape.

  The corner portion shown in FIG. 5 (n) is shown in FIG. 1 (a), and the opening / closing structure 10a is directed from the inside to the outside of the corner, as is apparent from the above-described production method. Thus, the structure can be freely opened and closed between the frame 20 (fixing member) and the diaphragm 15, and the extent of the opening and closing structure 10a changes in conjunction with the bending and stretching of the straight portion of the edge 10.

  That is, when the edge 10 is bent along the crease, the opening / closing structure 10a is also folded as shown in FIG. When the bending / extension of the straight portion of the edge 10 is extended, the opening degree of the opening / closing structure 10a is increased in conjunction with the extension (see FIG. 1B). FIG. 1C shows a state in which the straight portion of the edge 10 is bent and stretched most, and the opening degree of the opening / closing structure 10a is also maximized. In this state, the opening / closing structure 10a has a structure that can be freely opened and closed between the frame 20 and the diaphragm 15 from the inside to the outside of the corner. Nothing happens. On the other hand, in the conventional example shown in FIG. 9, since the crease in the straight line portion of the edge 2 extends to the corner portion, the bending of the straight portion of the edge 2 extends and the V-shaped cv of the corner portion is opened. The degree will soon become a limit, and it will not be able to catch up with the expansion and contraction of the straight portion, and the V-shaped cv will bend as shown in FIG.

  Thus, in this embodiment, since the corner portion is configured to be openable and closable between the frame 20 and the diaphragm 15 from the inner side to the outer side of the corner, the corner portion becomes the corner portion even if the edge 10 spreads. There is no bending. Therefore, the vibration width of the diaphragm can be set large, and a large volume can be obtained.

<Modification>
As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, It can implement with another various form. An example is shown below.

(1) Although the above-described embodiment is an example in which the present invention is applied to a diaphragm of a flat speaker, the diaphragm 15 can be configured as a passive diaphragm. In this case, instead of the frame 20, one surface (for example, a baffle plate) of the speaker enclosure is positioned, and a region surrounded by the edge 10 on the one surface is configured to open like an internal space of the frame 20. The
Here, FIG. 6 is a perspective view showing an example of a passive diaphragm. In FIG. 6, SP is a speaker provided with a voice coil, a magnet, and the like, and is attached to the front surface of the speaker enclosure 50. The speaker enclosure 50 is a rectangular parallelepiped sealed enclosure, and all six surfaces are formed of plate-like members. A thin plate-like diaphragm (passive diaphragm) 30 is attached to a baffle plate 50a (see FIG. 7) on the front surface of the speaker enclosure 50. The diaphragm 30 is formed in the same size as the front surface of the speaker enclosure 50 and covers the entire front surface of the speaker enclosure 50. A speaker mounting hole is provided through the diaphragm 30 and the baffle plate 50a, and the above-described speaker SP is inserted into the speaker mounting hole. In this case, the front frame of the speaker SP is fixed to the diaphragm 30 and the baffle plate 50a with screws.

  FIG. 7 is a front view of the speaker enclosure 20 with the diaphragm 30 removed. As shown in this figure, the baffle plate 20 a is formed only on the upper half of the front surface of the speaker enclosure 50. In the above configuration, the upper part of the diaphragm 30 is fixed to the baffle plate 50 a, but the lower part of the diaphragm 30 is a free end facing the opening, and can vibrate freely by the elasticity of the diaphragm 30. It is like that. Reference numeral 40 denotes an edge that is provided between the outer peripheral edge of the vibration part 30 a of the diaphragm 30 and the edge of the opening, and maintains the airtightness of the speaker enclosure 20. Here, the hatched portion in FIG. 7 is a rectangular frame-shaped edge 40. The edge 40 shown in this example has the same configuration as the edge 10 in the above-described embodiment, but has a shape in which one side (upper side) of the quadrangular frame is omitted. The outer peripheral edge portion of the edge 40 shown in FIG. 7 is bonded to the outer peripheral edge portion of the vibration portion of the diaphragm 30, thereby maintaining the airtightness of the speaker enclosure 50. Moreover, when the broken line portion of the edge 40 is freely bent, the vibration of the vibration portion 30a is not hindered and becomes free vibration.

8 is a diagram showing another example of the configuration of the speaker system to which the present invention is applied, in which (a) of FIG. 8 is a front view, (b) is a cross-sectional view taken along line AA shown in (a), c) is a sectional view taken along line B-B shown in FIG. FIG. 4D is an exploded view showing a side cross section.
The speaker enclosure 90 is a hermetically sealed enclosure and is formed in a rectangular parallelepiped shape that is flat in the back direction. Is formed. A baffle plate 90 a is provided on the front surface of the speaker enclosure 90. The baffle plate 90a is provided with a speaker mounting hole, and a speaker SP including a voice coil, a magnet, and the like is inserted into the speaker mounting hole. In this case, the front frame of the speaker SP is fixed to the baffle plate 90a with screws.

  Further, as shown in FIG. 8B, an opening 90b is formed in the lower portion of the baffle plate 90a, and the internal space of the speaker enclosure 90 is exposed from the opening 90b. A prismatic support 90c extending in the width direction is attached to the front upper end of the baffle plate 90a.

  A thin plate-like diaphragm 91 is provided in front of the baffle plate 90a. The diaphragm 91 is formed to be approximately the same size as the front surface of the speaker enclosure 90 and covers almost the entire front surface of the speaker enclosure 90. The upper end of the rear surface of the diaphragm 91 is fixed to the support part 90c, but the lower part of the diaphragm 91 is a free end near the lower end of the speaker enclosure 90, and thus the diaphragm 91 supports the support part 90c. It is free to vibrate. In this case, since the upper end portion of the diaphragm 91 is fixed to the support portion 90 c, the diaphragm 91 has a cantilever structure and vibrates due to the elasticity of the diaphragm 91. In this case, since the vibration plate 91 is elastically vibrated, the vibration of the lower portion of the vibration plate 91 that is away from the support portion 90c that is a fulcrum increases. That is, the part facing the opening 90b of the diaphragm 91 is the main vibration part. Below, the lower part of the diaphragm 91 is called the vibration part 91a.

Holes 91b and 91b having substantially the same diameter as the cone paper of the speaker SP are provided at positions corresponding to the speaker SP of the diaphragm 91, and the sound emitted forward from the speaker SP is the hole 91b, The data is output via 91b.
Next, 40 is an edge that is provided between the outer peripheral edge of the vibration part 91 a of the diaphragm 91 and the edge of the opening 90 b and maintains the airtightness of the speaker enclosure 90. The outer peripheral edge portion of the edge 40 is bonded to the outer peripheral edge portion of the vibration part 91a of the diaphragm 91, whereby the airtightness of the speaker enclosure 90 is maintained. Further, the edge 40 is formed in the same manner as the edge 10 in the above-described embodiment, and the bellows shape is freely bent, so that the vibration of the vibration part 91a is not hindered and becomes free vibration.

(2) In the above-described embodiment, the example in which the edge is formed by folding the sheet-like member has been described. However, if the above-described structure is formed, the sheet-like member may not be folded and formed. Good. For example, the above-described structure may be generated by integrally molding resin.

(3) In the above-described embodiment, Japanese paper is exemplified as an example of a sheet-like member. However, the present invention is not limited to this, and paper, resin film, leather, and the like can also be used.

(4) In the above-described embodiment, an example is described in which one corner portion is formed using a sheet-like member, and four of them are combined to form a square frame. A square frame may be formed by sequentially forming four corner portions from one end to the other end using a member, and finally joining the one end and the other end.

It is a perspective view which shows the structure of the edge 10 which is embodiment of this invention. It is a figure which shows the crease | fold at the time of forming the corner part of the embodiment with a sheet-like member. It is the figure which looked at the corner part shown in FIG. 1 from the front. It is a figure which shows the state which looked at the corner part shown in FIG. 1 from the Y-axis direction. It is a figure which shows the crease | fold at the time of forming the corner part of the edge shown in FIG. 1 with a sheet-like member. It is a perspective view of the speaker enclosure at the time of applying this invention to a passive diaphragm. It is a front view of the speaker enclosure shown in FIG. It is a figure which shows the other example of the speaker enclosure at the time of applying this invention to a passive radiator. It is a perspective view which shows the structural example of the conventional edge. It is a figure which shows the crease | fold at the time of forming the corner part of the edge shown in FIG. 9 with a sheet-like member. It is the figure which looked at the corner part shown in FIG. 9 from the front. It is a figure which shows the state which looked at the corner part shown in FIG. 9 from the Y-axis direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Edge, 10a ... Opening-and-closing structure, 15 ... Diaphragm, 20 ... Frame.

Claims (5)

A diaphragm having a rectangular outer periphery and emitting sound waves by receiving energy from a vibration source and vibrating;
A sheet-like member provided along the outer peripheral portion is provided between the outer peripheral portion of the diaphragm and the fixing member, and the sheet-like member has a predetermined crease at a straight portion along the side of the square. The vibration plate is supported in a freely oscillating manner by changing the degree of bending and stretching with respect to the crease, and the vibration at the corner of the sheet-like member corresponding to the corner of the outer periphery of the diaphragm Having an opening and closing structure for connecting a corner provided on the plate side and a corner provided on the fixing member side;
The opening / closing structure spreads in each direction on the diaphragm side and the fixing member side from a crease provided between a corner provided on the diaphragm side in the corner portion and a corner provided on the fixing member side. Has a shape,
An acoustic wave output mechanism comprising: an edge member whose degree of expansion of the opening / closing structure changes in conjunction with the bending and stretching.   The sound wave output mechanism according to claim 1, wherein the diaphragm is a diaphragm of a flat speaker, and the fixing member is a speaker frame.   The sound wave output mechanism according to claim 1, wherein the diaphragm is a passive diaphragm, and the fixing member is a member constituting one surface of a speaker enclosure.   The sound wave output mechanism according to any one of claims 1 to 3, wherein the edge member is integrally formed with the opening / closing structure. The opening and closing structure of the edge member is a rectangular sheet member,
Straight lines L10, L11, L12 parallel to the opposing long sides a, b are drawn at equal intervals, and the intersections of the straight lines L10, L12 connecting the midpoints of the long sides a, b and the straight lines L10, L12 are defined as points P1, P2. And a straight line L20 extending between the long side a and the line L11, and an angle of 45 ° clockwise with respect to the line L10 and the long side a. A line L21 extending between the lines L11 is drawn, a fold is formed between the long side a of the straight lines L20, 21 and the straight line L10, and a valley fold is formed between the straight lines L10 and L11.
It passes through the point P2, has an angle of 45 ° clockwise with respect to the straight line L12, has a straight line L30 extending between the long side b and the straight line L11, and has an angle of 45 ° counterclockwise with respect to the line L12. A straight line L31 extending between the side b and the straight line L11 is drawn, a mountain fold is formed between the long side b of the straight lines L30, 31 and the straight line L12, and a valley fold is formed between the straight lines L12 and L11.
A straight line L40 passing through the point P1 and having an angle of 67.5 ° counterclockwise with respect to the straight line L10 is drawn between the straight line L11 and the long side a, and an angle of 67.5 ° clockwise with respect to the straight line L10. A straight line L41 having a straight line L11 is drawn between the straight line L11 and the long side a, a valley fold is formed between the long side a of the straight lines L40 and 41 and the straight line L10, and a mountain fold is formed between the straight line L10 and the straight line L11.
As the point P2, a straight line is drawn L50 having an angle of 67.5 ° clockwise with the straight line L1 2 and the long side b with respect to the straight line L12, the 67.5 ° counterclockwise with respect to the straight line L12 Formed by drawing a straight line L51 having an angle between the straight line L12 and the long side b , forming a valley fold between the long side b of the straight lines L50 and 51 and the straight line L12, and forming a mountain fold between the straight lines L11 and L12. The sound wave output mechanism according to any one of claims 1 to 3, wherein:

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