JP3138044U - Speaker box and speaker device - Google Patents

Abstract

An object of the present invention is to reduce a sound pressure on a speaker and to simplify a design and manufacture in a speaker box and a speaker device in which a sound path of a horn is formed around the speaker.
A line formed between adjacent squares having the closest size from a planar shape in which the inner wall of the speaker box is arranged in a spiral shape with a group of squares whose side ratio increases according to the Fibonacci sequence. It is formed along a spiral planar shape with the minutes removed, and a speaker mounting opening is formed in the smallest square part so that the speaker surface can be attached in parallel, and the planar shape is aligned on one side of the largest square part. An opening is formed substantially perpendicular to the direction.
[Selection] Figure 5

Description

  The present invention relates to a speaker box and a speaker device, and more particularly to a speaker box in which a horn function is formed and a speaker device using the same.

Conventionally, as a kind of speaker box, there is a so-called back load horn type speaker box in which a horn is formed in a box and a bass sound is reverberated as described in Patent Document 1. The thickness of such a speaker box is generally defined by the outer diameter of the speaker to be attached. On the other hand, Tetsuo Nagaoka has announced a back load horn type speaker having an internal structure as shown in FIG. In this speaker, since the sound path 1 is formed around the position of the speaker mounting opening O, the thickness of the speaker box is defined by the thickness of the speaker to be mounted, so that a thin speaker system can be formed.
JP 2003-204586 A

However, the speaker box having the structure shown in FIG. 15 has a so-called throat portion in which the sound path l immediately after the speaker is narrowed. FIG. 16 shows a schematic linear development of the speaker box shown in FIG. As shown in the figure, the first sound path from the wall surrounding the speaker to the horn constituting the sound path passes through a sound path that is narrower than the outer diameter of the speaker in the swooker box of FIG. The sound path narrower than the diameter continues. As a result, the speaker box shown in FIG. 15 has a problem that the sound pressure with respect to the speaker increases.
Further, the speaker shown in FIG. 15 increases the width of the sound path l by a logarithmic function, and there is a problem that it is difficult to design and manufacture.
In view of such a problem, the present invention has an object to reduce the sound pressure on the speaker and simplify the design and manufacture in the speaker box and the speaker device that form the sound path of the horn around the speaker. To do.

In order to solve the above problems, the present invention has the following configuration.
According to the first aspect of the present invention, the second square having the same length as the side of the first square is adjacent to the first square so that the sides are aligned, and is twice as long as the second square. When the third square having the side is in contact with both the first square and the second square so that the sides are aligned, and N is a natural number from 4 to R (R is 4 or more), For any N, the Nth square having the length of the side of the (N-1) th square and the length of the (N-2) th square is the Nth square of the N-1th square. From the planar shape that is aligned with the side opposite to the side adjacent to the second square and satisfies the contact with the (N-1) th square so as not to be adjacent to the (N-2) th square, the size is closest. An inner wall is formed along a spiral plane shape in which a line segment formed between adjacent squares is deleted, and a speaker surface is formed on the first square portion. The speaker box has a speaker mounting opening formed so as to be mounted in a row, and an opening formed substantially perpendicular to the planar shape on a side aligned with one side of the Rth square of the Rth square. . In addition, the inner wall in this application includes the inner wall formed by an internal partition plate other than the inner wall which comprises the external shape of a speaker box. Note that “adjacent so that the sides are aligned” means that the sides are in contact with each other so that the sides are in the same straight line.

  According to the second aspect of the present invention, the second square having the side of (√5 + 1) / 2 times the side of the first square is adjacent to the first square so that the sides are aligned. When the natural number is R (R is 3 or more), the Nth square having (√5 + 1) / 2 times the side of the (N−1) -th square is arbitrary N. From a planar shape that is aligned with the side opposite to the side adjacent to the square N-2 square and that contacts the N-1 square so as not to be adjacent to the N-2 square, An inner wall is formed along a spiral plane shape in which a line segment formed between adjacent squares having the closest size is removed, and a speaker surface is attached substantially parallel to the first square portion. A speaker mounting opening is formed, and the planar shape is formed on the side where one side of the R-1th square of the Rth square is aligned. This is a speaker box in which an opening is formed substantially perpendicular to the shape.

According to a third aspect of the present invention, in the speaker box, a reflector is provided on at least one of the corner portions inside the inner wall. The inner corner of the inner wall is a portion where the inner wall forms an angle of 90 degrees.
The invention described in claim 4 is the speaker box according to claim 3, wherein the reflector is provided for each corner portion of the inner wall and is formed in a curved surface having a concave surface facing the corner portion. is there.
According to a fifth aspect of the present invention, in the speaker box according to the first to third aspects, at least a part of an inner wall provided along the spiral planar shape has a spiral planar curve inscribed in the planar shape. The speaker box according to claim 1, wherein the speaker box is replaced with a part of an inner wall formed along the inner wall. In addition, the spiral plane curve inscribed in the plane shape refers to a shape formed by smoothly connecting the curves so as to come into contact with points that become the boundaries between the squares that are sequentially increased.
The invention according to claim 6 is formed in the speaker box such that the depth of the Nth square portion is greater than or equal to the depth of the square portion of the (N-1) th square portion with respect to the arbitrary N. Is.

The invention according to claim 7 is a speaker device in which a speaker is attached to the speaker attachment port of the speaker box so that a back surface faces inward.
The invention according to claim 8 is a speaker device in which a speaker is attached to the speaker attachment port of the speaker box so that a front surface faces inward.

According to the first aspect of the present invention, the planar shape along the inner wall of the speaker is such that each side has a side length in the order of the Fibonacci sequence (1, 1, 2, 3, 5, 8, 13, 21,...). Are combined in a vortex, and the outer periphery is always rectangular. As this rectangle grows, it approaches a rectangle with a golden ratio. The sound path formed by the inner walls provided along the shape formed by removing the square partitions adjacent to each other in this shape gradually increases from the first square, so there is no throat and the sound pressure to the speaker is low. can do.
Specifically, when this speaker box is schematically linearly developed, it becomes as shown in FIG. Since the sound path from the wall surrounding the speaker mounting opening to the horn that makes up the sound path is always larger than the outer diameter of the speaker from the beginning, the sound path on the back of the speaker is larger than the outer diameter of the speaker. The sound pressure on the back will be reduced.

In addition, the design is simple because the squares are combined, and the manufacturing can be performed simply by combining, for example, a box whose side is appropriately opened with a square having a large side according to the Fibonacci sequence. Also, when forming a partition in a box having a planar shape inside the rectangle, the spiral planar shape can be drawn relatively easily, and it is only necessary to provide a partition along the spiral planar shape. It can be manufactured relatively easily.
The fact that the spiral planar shape can be drawn relatively easily will be specifically described below. 2A to 2J show a process of drawing a planar shape. First, a rectangular plate is prepared so that the ratio of the long side to the short side is a Fibonacci sequence. First, as shown in FIG. 2A, a point A1 is marked on the long side from one end to the same length as the short side. For this work, a writing instrument such as a string and a pencil is sufficient. Then, a line segment L1 is drawn perpendicularly from the point A1 as shown in FIG. This can be done with a right angle ruler or a deposit. Next, since a rectangle having L1 as a long side appears, a point A2 having the same length as the short side of the rectangle is marked from one end on the opposite side of L1, as shown in FIG. Then, a line segment L2 is drawn at a right angle from the point A2 as shown in FIG. In the same procedure, A3, A4, and A5 are sequentially marked as shown in FIGS. 2 (e) to 2 (j), and line segments L3, L4, and L5, and finally a square of the same size, are added. Draw lines until they are lined up. With the above, a line segment for arranging the partition plates can be drawn. In other words, as long as the initial rectangular shape is drawn, it is not necessary to perform any measurement work with a ruler. In particular, when manufacturing by one-piece production, the manufacturing work can be facilitated and the work efficiency can be improved.

In addition, a case where the square is formed by combining a box whose side surfaces are appropriately opened in a square shape having a large side according to the Fibonacci sequence will be specifically described below. 3A to 3F sequentially show the manufacturing process in this case. First, a first box-shaped square back plate S1 is prepared. If the planned speaker is large enough to fit inside, it does not have to be a square with the correct size. Next, as shown in FIG. 3A, a second box-shaped square back plate S2 is prepared. This can be easily obtained by copying the length of one side of S1 with a string or the like. Then, as shown in FIG. 3B, a third box-shaped square back plate S3 having one long side of the rectangle obtained by connecting S1 and S2 is prepared. This can also be easily obtained by copying the length of the side with a string or the like. Further, as shown in FIG. 3 (c), a square back plate S4 of a fourth box body is prepared in which the long side of the rectangle obtained by connecting S3 with a rectangle combining S1 and S2 is changed. Thereafter, the back plate is prepared in the same procedure as shown in FIGS. 3 (d) to 3 (e). With the procedure so far, again, there is no need to perform measurement or calculation with a ruler. Once the back plate is obtained, it is easy to obtain the baffle plate by copying the shape based on this and taking the material. A speaker mounting hole is provided only on the baffle plate of the first box. Only the first box is provided with side plates other than one side, and the remaining boxes are provided with side plates other than two adjacent side surfaces. The width of the side plate may be copied from the back plate with a string or the like, and when the height is the same, the height may be copied with a string or the like, so that the side plate can also be easily obtained. Finally, by connecting the boxes, the speaker box of the speaker according to the present invention can be obtained. As described above, even when the boxes are formed in combination, the operation of measuring the length by calculation or a ruler is completely unnecessary, and the design and manufacturing can be performed very easily.

The invention described in claim 2 relates to the planar shape along the inner wall of the speaker, and by combining the squares whose side lengths are increased by (√5 + 1) / 2 times in order so as to be swirled one after another, the outer periphery is always golden. A rectangle with a ratio. Since the sound path formed by the inner wall provided along the shape formed by removing the adjacent square partitions in this shape is gradually increased from the first square, the shape is also as shown in FIG. It can be deployed, there is no throat, and the sound pressure on the speaker can be lowered.
In addition, the design is simple because the squares are combined, and in the manufacturing, for example, it can be formed simply by combining the box having a side surface that has a square shape that increases by (√5 + 1) / 2 times as appropriate. In addition, when forming a partition in a box having a rectangular shape having a golden ratio as a planar shape, the spiral planar shape can be drawn relatively easily, and a partition can be provided along the spiral planar shape. Therefore, it can be manufactured relatively easily.
In the invention according to claim 2, the method of drawing the spiral plane shape is the same as that described in claim 1, and only the point that the rectangular plate prepared first has a ratio of the long side to the short side is a golden ratio. However, since the subsequent work can be done in the same way, the work to calculate and length is hardly required, and it is formed only by combining a box with an open side with a square shape. In this case, a box having a back plate and a baffle plate having a square shape in plan view is sequentially formed except that the back plate and the baffle plate are formed by a rectangle having a golden ratio in the short side and the long side in the plan view. Combining the bodies does not require calculation or measurement by the same method as in the first aspect of the invention, so that the design and manufacture can be easily performed.

According to the third aspect of the present invention, by providing a reflector at at least one of the corner portions inside the two inner walls, the sound pressure at the corner portion is reduced, and the sound is more smoothly brought to the opening. Can do.
In the invention according to claim 4, since the reflecting plate is provided for every inner corner portion and is formed in a curved surface having a concave surface facing the corner portion, the outer side of the sound path has a smooth vortex curve. In addition, the sound can smoothly reach the opening.
According to the fifth aspect of the present invention, the inner wall itself is formed of a curved surface, so that the sound path can be smoothed and the sound can be smoothly transmitted to the outside.
The invention according to claim 6 is formed so that the depth of the Nth square portion is greater than or equal to the depth of the square portion of the (N-1) th square portion with respect to the arbitrary N, and the width on the depth side is also set. It can be formed so that it gradually increases as it approaches the opening.
The invention according to claim 7 is a speaker device in which a speaker is attached to the speaker mounting opening of the speaker box so that the back surface faces inward, and the sound pressure with respect to the back surface of the speaker is low, and the design and manufacture are performed. Can be easily.
The invention according to claim 8 is a speaker device in which a speaker is attached to the speaker attachment port of the speaker box so that the front surface faces inward, and the sound pressure with respect to the front surface of the speaker is reduced, and the design and manufacture are facilitated. can do.

Embodiments of the present invention will be described below with reference to the drawings.
(Embodiment 1)
FIG. 4 is a perspective view of the speaker device X including the speaker box A according to the first embodiment. The speaker device X includes a speaker box A and a full-range speaker S including wiring. The speaker box A is composed of a baffle plate 11 formed on the front surface, a back plate 12 formed on the back surface, side plates 13, 14, 15 and 16 surrounding a side surface and an upper bottom surface, and a partition plate 17 formed inside. Is done. The length of the side plate in the depth direction is set to a value between 1/2 and 2 times the diameter of the speaker unit. FIG. 5A shows a cross-sectional view of the speaker box A. FIG. The inner wall of the speaker box A is composed of side plates 13, 14, 15, 16 and a partition plate 17, which are formed based on a shape in which squares of a predetermined size are arranged according to a predetermined rule.

  FIG. 5B shows six squares that serve as a reference for the inner wall. The first square Q1 and the second square Q2 are congruent squares and are arranged in contact with each other so that the sides completely overlap. As a result, the sides adjacent to the contacted side of the first square Q1 and the second square Q2 are aligned. The third square Q3 is a square whose one side is the sum of the length of the first square Q1 and the length of the second square Q2, and is equal to each of the first square Q1 and the second square Q2. To touch. As a result, the two opposite sides of the third square Q3 are aligned with one side of the first square Q1 and one side of the second square Q2, respectively. The fourth square Q4 is a square having a side having a length obtained by adding one side of the second square Q2 and one side of the third square Q3, and the side in contact with the first square Q1 and the second square Q2 of the third square Q3. Are adjacent to the third square Q3 on the side that is aligned with the opposite side and does not contact the second square Q2. The fifth square Q5 is a square having a side having a length obtained by adding one side of the third square Q3 and one side of the fourth square Q4, and the side opposite to the side of the fourth square Q4 that contacts the third square Q3. It is aligned and adjacent to the fourth square Q4 on the side that does not contact the third square Q3. The sixth square Q6 is a square having a side having a length obtained by adding one side of the fourth square Q4 and one side of the fifth square Q5, and the side facing the side in contact with the fourth square Q4 of the fifth square Q5. And is adjacent to the fifth square Q5 on the side not in contact with the fourth square Q4.

In other words, the first square Q1 to the sixth square Q6 have side lengths of 1, 1, 2, 3, 5, 8, and so-called Fibonacci, which is a value obtained by adding the values of the previous two terms after the third item. It constitutes a number sequence, and the first square Q1 to the sixth square Q6 are arranged in a spiral shape from the inside to the outside.
And from this shape, side plates 13 to 16 and partition plate 17 are formed along a spiral shape in which a line segment (shown by a circle in the figure) formed between adjacent squares closest in size is deleted. The inner wall is formed by.
A speaker attachment port 11a for attaching a speaker is provided on the surface of the baffle plate 11 of the speaker box A facing the first square Q1, and the speaker S is attached so that the back side faces the inside of the speaker box. Further, an opening 14a is formed on the side aligned with the third square of the sixth square Q6 because no inner wall is provided.
With such a configuration, the back load horn type speaker device X is formed which is formed in a spiral shape including a square in which the sound path gradually increases. In this speaker device X, the sound path is formed on the basis of a spiral arrangement of successively increasing squares, so there is no throat and the sound pressure on the back side of the speaker is small. Further, the first square Q1 to the sixth square Q6 forming the sound path can be easily drawn on the back plate 12, and the side plates 13 to 16 and the partition plate 17 may be arranged here, so the manufacture is also compared. Can be done easily.

  The speaker box can be formed by combining square boxes in front view. FIG. 6 shows an exploded perspective view of the speaker box A2 formed by combining such square boxes in front view, and FIG. 7 shows a perspective view of the speaker box A2. The speaker box A2 includes the first box body 21, the second box body 22, the third box body 23, and the fourth box body 24 that use the first square Q1 to the sixth square Q6 as the baffle plate and the back plate, respectively. The fifth box 25 and the sixth box 26 are formed. The baffle plate of the first box 21 is provided with a speaker mounting hole 21a and one side surface is open. The remaining second box body 22 to sixth box body 26 have two adjacent side surfaces open. Then, as shown in FIG. 7, the speaker box A <b> 2 is assembled by combining the first box body 21 to the sixth box body 26 with the open surfaces connected to each other so as to wrap around the first box body 21. Obtainable. The speaker box A2 can also be manufactured relatively easily because it can be obtained by appropriately combining square boxes in front view.

  Further, a reflector may be provided at the corner portion inside the sound path formed in the speaker box. FIG. 8 (a) shows a diagram in which a flat plate-like reflector 18 is provided at the inner corner, and FIG. 8 (b) shows a reflector having a curved surface with a concave surface facing the corner at the inner corner. The figure which provided 19 is shown. By providing the reflector 18 and the reflector 19 in this way, a smoother sound path can be obtained. This sound path approximates a logarithmic spiral curve. In addition, as shown in FIG. 8B, in the case where the reflection plate 18 substantially blocks the inner wall, as shown in FIG. 9, it is possible to configure only the reflection plate 19X as the inner wall.

Further, in the present embodiment, the baffle plate 11 and the back plate 12 are formed of a planar plate body, but the depth may be changed. FIG. 10 shows a perspective view of the speaker box A3 with the baffle plate 11 down. In this speaker box, A3 is obtained by increasing the depths L1 and L2 of the fifth square Q5 and the sixth square Q6. By doing so, the aspect ratio of the opening 14aa can be made close to 1: 1. In addition, you may make it make the area of the baffle plate 11 and the back plate 12 small so that the part which extended the depth may not change the original state and volume.
And in this embodiment, although it forms with six squares which draw the spiral figure used as the origin of an inner wall, the number of squares can be chosen suitably, and even if it increases the number of squares, design, Manufacture can be performed relatively easily.

(Embodiment 2)
FIG. 11A shows a cross-sectional view of the speaker device Y including the speaker box B according to the second embodiment. The speaker box B has substantially the same configuration as the speaker box A according to the first embodiment, and includes a baffle plate (not shown) formed on the front surface, a back plate 32 formed on the back surface, side surfaces, and side plates 33 and 34 surrounding the upper and lower surfaces. , 35, 36, and a partition plate 37 formed inside. The length of the side plate in the depth direction is also set to a value between 1/2 and 2 times the diameter of the speaker unit. The speaker box B is different from the speaker box A in that the spiral figure that forms the inner wall is based on a figure in which squares whose sides are increased by (√5 + 1) / 2 times are arranged in a spiral pattern. It is.

  FIG. 11B shows five squares that serve as a reference for the inner wall. First, the rectangle K constituting the whole is a so-called golden ratio in which the ratio of the long side to the short side is (√5 + 1) / 2: 1, and the fifth square P5 is a square including the short side of the rectangle K. The portion excluding the fifth square P5 from K also becomes a rectangle having the golden ratio again due to the property of the rectangle having the golden ratio. Hereinafter, the 4th square P4, the 3rd square P3, the 2nd square P2, and the 1st square P1 are figures which cut out the square part from the rectangle which has golden ratio one by one so that a vortex may be drawn. After the first square P1 is cut out, a rectangle having a golden ratio remains, but this is not used here. When viewed from the first square P1, the second square P2 has (√5 + 1) / 2 times the side of the first square P1, and is adjacent to the first square P1 so that the sides are aligned. The third square P3 has a side that is (√5 + 1) / 2 times the side of the second square P2, is aligned with the side facing the side adjacent to the first square P1 of the second square P2, and The second square P2 is contacted so as not to be adjacent to the first square P1. The fourth square P4 has a side that is (√5 + 1) / 2 times the side of the third square P3, is aligned with the side facing the side adjacent to the second square P2 of the third square P3, and The third square P3 is contacted so as not to be adjacent to the second square P2. The fifth square P5 has (√5 + 1) / 2 times the side of the fourth square P4, is aligned with the side facing the side adjacent to the third square P3 of the fourth square P4, and The fourth square P4 is contacted so as not to be adjacent to the third square P3.

An inner wall is formed along a spiral shape in which a line segment (indicated by a circle in the figure) formed between adjacent squares having the closest size is deleted from the planar shape formed in this way. ing. In addition, although the rectangular part with golden ratio adjacent to the 1st square P1 is covered with the part 37a which made the partition plate 37 thick, you may provide so that the partition plate 37 may be enclosed along a rectangular part. In addition, a speaker attachment opening for attaching a speaker is provided on the surface of the baffle plate (not shown) of the speaker box B facing the first square P1, and the speaker is attached so that the back side faces the inside of the speaker box. In addition, an opening 34a is formed on the side aligned with the second square of the fifth square P5 because no inner wall is provided.
The speaker device Y including the speaker box B having such a configuration also has a backload horn formed in a spiral shape including a square in which the sound path increases in order, and the sound pressure on the back side of the speaker is small. Become. Further, the first square P1 to the fifth square P5 forming the sound path can be easily drawn on the back plate 2, and the partition plate 17 may be disposed here, so that the manufacturing is also relatively easy. Can do.

  Similarly to the speaker box A according to the first embodiment, the speaker box B according to the second embodiment can be easily formed by combining square boxes in front view. In addition, an appropriate reflector can be provided at the corner portion inside the sound path, and only the reflector can be configured as the inner wall. Furthermore, the depth of the speaker box B can be changed as appropriate. Furthermore, also in the second embodiment, the number of squares for drawing the spiral shape that is the source of the inner wall can be selected as appropriate, and even if the number of squares is increased, design and manufacturing can be performed relatively easily. it can.

(Application examples)
Since the speaker device having the above-described configuration can be made thin, various applications are possible. For example, as shown in FIG. 12A, the speaker device Z having a shape close to a book is stored in a bookshelf Bs and used by being pulled out so that the speaker is exposed when in use. As shown in (b2), it can be used by being placed on the front surface of the bookshelf during use. Further, as shown in FIG. 13A, when used as an acoustic speaker device V for a movie theater or a home theater, the speaker does not protrude, so that a feeling of pressure can be reduced. Furthermore, as shown in FIG. 13B, the built-in speaker W inside the door of the automobile and the built-in speaker U of a small device such as a mobile phone as shown in FIG. It is possible to make a bass sound.

In the above embodiment, the back load horn speaker device is configured. However, as shown in FIG. 14, the speaker box C is used as a front horn by attaching the front surface of the speaker Sa1 to the speaker mounting opening of the speaker box C. It is also possible. In FIG. 14, the speaker Sa1 attached to the speaker box C is a woofer capable of covering a relatively small size of about 6000 Hz, and a tweeter is mounted on the upper part as a high-frequency band speaker Sa2. is doing.
Furthermore, in the above speaker box, the opening portion is closed, a speaker mounting port is provided on the baffle plate of the largest square portion, the speaker is mounted, and the original speaker mounting port is set as an open port so that the reverse back horn speaker can be mounted. It is also possible to form.

It is a figure which shows the state which expand | deployed the speaker box which concerns on Claim 1 typically linearly. (A)-(j) is a figure which shows the process in which the planar shape for producing the speaker box which concerns on Claim 1 is drawn. (A)-(f) is a figure which shows the process of combining the box which opened the side suitably which makes a square planar shape in order to produce the speaker box which concerns on Claim 1. FIG. 1 is a perspective view of a speaker device including a speaker box according to Embodiment 1. FIG. (A) is a cross-sectional view of the speaker box according to the first embodiment, (b) is a diagram showing a square group serving as a reference of the inner wall of the speaker box according to the first embodiment. It is a disassembled perspective view of the speaker box which combined the box body of front view squares concerning Embodiment 1. FIG. It is a perspective view of the speaker box which combined the box body of front view squares concerning Embodiment 1. FIG. (A) and (b) are the cross sections of the speaker box which concerns on Embodiment 1 which shows the state which provided the reflecting plate in the corner | angular part inside the inner wall which concerns on Embodiment 1. FIG. It is a cross-sectional view which shows the speaker box which concerns on Embodiment 1 which used only the reflecting plate as the inner wall. It is a perspective view which shows the speaker box which concerns on Embodiment 1 which changed the length of depth sequentially. (A) is a cross-sectional view of the speaker box according to the second embodiment, (b) is a diagram showing a square group serving as a reference of the inner wall of the speaker box according to the second embodiment. (A) is a perspective view which shows the state which set the speaker apparatus made into the size of a book on a bookshelf, (b1), (b2) is the state which set the speaker apparatus made into the size of a book on a bookshelf. FIG. (A) is a front view which shows the state applied as an acoustic speaker apparatus, such as a movie theater, (b) is a front view which shows the state applied as an automobile speaker apparatus, (c) is a built-in small apparatus. It is a front view which shows the state applied as a speaker apparatus. It is a perspective view which shows the speaker apparatus which used the speaker box as a front horn. It is a cross-sectional view showing the internal structure of a conventional back load horn type speaker device. It is the figure which expanded the speaker box shown in FIG. 15 typically linearly.

Explanation of symbols

X, Y, Z, W, U Speaker device A, A2, A3, B, C Speaker box S, Sa1 Speaker 11, 31 Baffle plate 12, 32 Back plate 13, 14, 15, 16, 33, 34, 35, 36 Side plate 17, 37 Partition plate 18, 19, 19X Reflector

Claims (8)

  The second square having the same length side as the first square side is adjacent to the first square so that the sides are aligned, and the third square has a side twice as long as the second square. Is in contact with both the first square and the second square so that the sides are aligned, and when N is a natural number from 4 to R (R is 4 or more), the N-1 The Nth square having the length of the side of the square plus the length of the (N-2) th square is the side adjacent to the (N-2) th square of the (N-1) th square. Are formed between adjacent squares that are closest to each other in size from a planar shape that meets the N-1 square so as not to be adjacent to the N-2 square. An inner wall is formed along a spiral planar shape from which a line segment is removed, and a speaker surface is attached in parallel to the first square portion. With speaker mounting opening is formed, a speaker box substantially perpendicular to the opening to the plane shape sides aligned on one side of the R-3 square square of the R is formed.   According to the second aspect of the present invention, the second square having the side of (√5 + 1) / 2 times the side of the first square is adjacent to the first square so that the sides are aligned, and N is changed from 3 When the natural number is R (R is 3 or more), the Nth square having (√5 + 1) / 2 times the side of the (N−1) -th square is arbitrary N. From a planar shape that is aligned with the side opposite to the side adjacent to the square N-2 square and that contacts the N-1 square so as not to be adjacent to the N-2 square, An inner wall is formed along a spiral plane shape in which a line segment formed between adjacent squares having the closest size is removed, and a speaker surface is attached substantially parallel to the first square portion. A speaker mounting opening is formed, and the planar shape is formed on the side where one side of the R-1th square of the Rth square is aligned. Speaker box with an opening formed almost perpendicular to the shape.   The speaker box according to claim 1 or 2, wherein a reflector is provided on at least one of the corner portions inside the inner wall.   The speaker box according to claim 3, wherein the reflection plate is provided for each corner portion of all inner walls and is formed in a curved shape having a concave surface facing the corner portion. The at least part of the inner wall provided along the spiral planar shape is replaced with a part of the inner wall formed along a spiral planar curve inscribed in the spiral planar shape. The speaker box according to any one of the above.   The depth according to any one of claims 1 to 5, wherein the depth corresponding to the Nth square portion is greater than or equal to the depth corresponding to the N-1th square portion with respect to the arbitrary N. Speaker box.   The speaker apparatus which attached the speaker to the said speaker attachment port of the speaker box of any one of Claim 1 to 6 so that the back might face inside.   A speaker device in which a speaker is attached to the speaker attachment port of the speaker box according to any one of claims 1 to 6 so that a front surface faces inward.

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