JP2017085364A - Speaker device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker device with improved sound quality.SOLUTION: A speaker device includes: a diaphragm for generating sound in response to an input drive signal; a speaker cabinet that stores the diaphragm on a front surface side and has a side wall arranged to be rotation-symmetric to a center axial line of the diaphragm; a first inner wall arranged to be coaxial with the diaphragm and extended in a cylindrical shape from a rear surface of the diaphragm to a position having a predetermined gap with a rear surface plate of the speaker cabinet; and a second inner wall arranged to be coaxial with the diaphragm and extended in a cylindrical shape on the inner side of the first inner wall from a rear inner surface of the speaker cabinet to a position having a predetermined gap with the rear surface of the diaphragm. A cross sectional area of a space formed between the first inner wall and the second inner wall is smaller than a cross sectional area of a space formed between the side wall and the first inner wall concerning a surface vertical to the center axial line of the diaphragm.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a speaker device.

  In the above technical field, Patent Document 1 states that “starting from the back of the speaker unit 3 substantially horizontally toward the rear, the sound path 8 is bent sequentially, and thus the linear region is divided by folding. The speaker box 20 is disclosed.

Japanese Patent No. 4864685

  However, in the technique described in the above document, the structure of the back load horn is asymmetric with respect to the axis of the diaphragm, so that the reflected wave strikes obliquely (asymmetry when viewed from the center of the diaphragm) with respect to the diaphragm. As a result, the sound signal is changed to vibration when the diaphragm is inclined, which causes distortion of the reproduced sound.

  The objective of this invention is providing the technique which solves the above-mentioned subject.

In order to achieve the above object, an apparatus according to the present invention provides:
A diaphragm that generates sound according to the input drive signal;
A speaker cabinet in which the diaphragm is accommodated on the front side and side walls are arranged so as to be rotationally symmetric with respect to the central axis of the diaphragm;
A first inner wall that is arranged coaxially with the diaphragm, and extends in a cylindrical shape from the rear surface of the diaphragm to a position having a predetermined gap from the rear plate of the speaker cabinet;
A second inner wall that is arranged coaxially with the diaphragm, and extends in a cylindrical shape from the rear inner surface of the speaker cabinet to a position having a predetermined gap with the rear surface of the diaphragm, inside the first inner wall;
With
It is formed between the first inner wall and the second inner wall from the sectional area of the space formed between the side wall and the first inner wall in a plane perpendicular to the central axis of the diaphragm. The speaker device has a smaller space cross-sectional area.

  According to the present invention, a speaker device with improved sound quality can be provided.

1 is a partial transmission diagram illustrating a configuration of a speaker device according to a first embodiment of the present invention. It is sectional drawing which shows the structure of the speaker apparatus which concerns on 1st Embodiment of this invention. It is a figure which shows the structure of the speaker apparatus which concerns on 2nd Embodiment of this invention. It is a figure which shows the structure of the speaker apparatus which concerns on 3rd Embodiment of this invention. It is sectional drawing which shows the structure of the speaker apparatus which concerns on 4th Embodiment of this invention. It is sectional drawing which shows the structure of the speaker apparatus which concerns on 5th Embodiment of this invention. It is sectional drawing which shows the structure of the speaker apparatus which concerns on 6th Embodiment of this invention. It is sectional drawing which shows the structure of the speaker apparatus which concerns on 7th Embodiment of this invention. It is sectional drawing which shows the structure of the speaker apparatus which concerns on 8th Embodiment of this invention. It is sectional drawing which shows the structure of the speaker apparatus which concerns on 9th Embodiment of this invention. It is sectional drawing which shows the structure of the speaker apparatus which concerns on 10th Embodiment of this invention. It is sectional drawing which shows the structure of the speaker apparatus which concerns on other embodiment of this invention. It is sectional drawing which shows the structure of the speaker apparatus which concerns on other embodiment of this invention. It is sectional drawing which shows the structure of the speaker apparatus which concerns on other embodiment of this invention.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the components described in the following embodiments are merely examples, and are not intended to limit the technical scope of the present invention only to them.

[First Embodiment]
A speaker device 100 as a first embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 and 2, the speaker device 100 includes a vibration plate 101, a speaker cabinet 102, and inner walls 103 and 104. FIG. 1 is a perspective view of the entire structure shown through the speaker cabinet 102 for easy understanding. FIG. 2 is a longitudinal sectional view taken along a plane passing through the central axis 110 of the diaphragm 10.

  The diaphragm 101 is a part of the speaker unit, and generates sound according to the input drive signal.

  The speaker cabinet 102 includes a side wall 121 and a back plate 122 and accommodates the diaphragm 101 on the front side. The side wall 121 is disposed so as to be rotationally symmetric with respect to the central axis 110 of the vibration plate 101. The overall image of the speaker cabinet 102 is cylindrical (the front image is circular), and the side wall 121 of the speaker cabinet 102 and the diaphragm 101 have a concentric structure when viewed from the front.

  The inner wall 103 is arranged coaxially with the diaphragm 101 and extends in a cylindrical shape from the back surface of the diaphragm 101 to a position having a predetermined gap with the back plate 122 of the speaker cabinet 102.

  The inner wall 104 is disposed coaxially with the diaphragm 101 and extends in a cylindrical shape from the rear inner surface of the speaker cabinet 102 to a position having a predetermined gap with the rear surface of the diaphragm 101 inside the inner wall 103.

  Then, the sectional area of the space formed between the inner wall 103 and the inner wall 104 in the plane perpendicular to the central axis 110 of the diaphragm 101 is larger than the sectional area of the space formed between the sidewall and the inner wall 103. Is designed to be smaller.

  Further, on the inner side of the inner wall 104, a conical portion 105 is disposed coaxially with the diaphragm 101 and extends from the rear surface of the diaphragm 101 to a position having a predetermined gap with the rear plate 122 of the speaker cabinet 102.

  As shown in FIG. 2, the sound 201 generated from the back side of the diaphragm 101 is reflected by the back plate 122 of the speaker cabinet 102 through the gap between the side wall 121 and the inner wall 103. The sound reflected by the back plate 122 now travels through the gap between the inner wall 103 and the inner wall 104 and is reflected by the back surface 202 of the speaker unit. Then, the sound is sufficiently attenuated while heading toward the back plate 122 of the speaker cabinet 102 again.

  Thereby, the sound of the same volume as that from the front surface generated from the back surface of the diaphragm 101 is attenuated, and deterioration in sound quality due to mixing with the sound from the front surface can be suppressed. The sound 201 emitted from the rear surface of the diaphragm 101 is reflected in the speaker cabinet 102 and reaches the rear panel 122. At this time, the reflected sound from the rear panel 122 does not return to the diaphragm 101 side. 101 is not mixed with sound from the front surface, and the vibration plate 101 is not shaken. Furthermore, the sound generated from the back surface of the diaphragm 101 is guided to a sound path (reverse back load horn) whose cross-sectional area gradually decreases, thereby reducing reflected waves and consequently reducing adverse effects on the diaphragm ( The component transmitted through the diaphragm and radiated in front of the speaker can also be reduced). Furthermore, it is possible to prevent resonance such as standing waves in the speaker cabinet 102.

  In particular, the side walls of the cabinet are axisymmetrically formed, and the central axis of the speaker unit is mounted coaxially with the central axis of the cabinet, so that the difference in time (phase) at which a plurality of reflected waves on the back plate 122 reach the diaphragm 101. Does not occur. For this reason, the influence of the sound pressure reflected in the cabinet on the diaphragm is not biased, the reflected wave does not shake the diaphragm 101 diagonally, distortion during sound reproduction can be reduced, and sound quality is also improved. Can be made.

  By folding the reverse back load horn, the size of the entire speaker can be reduced to the point where it can be used in the home.

[Second Embodiment]
Next, a speaker device according to a second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a perspective view of the overall structure of the speaker device 300 shown through the speaker cabinet 102 for easy understanding.

  The speaker device 300 according to the present embodiment is different from the first embodiment in that a sound absorbing material 301 is provided at the end of the sound path formed on the back surface of the diaphragm 101. Since other configurations and operations are the same as those of the second embodiment, the same configurations and operations are denoted by the same reference numerals, and detailed description thereof is omitted.

  In this embodiment, by arranging the sound absorbing material at the end of the reverse horn, the sound emitted from the back surface of the diaphragm 101 is guided to the sound path (reverse backload horn) in which the cross-sectional area gradually decreases, The reflected wave can be reduced. As a result, the adverse effect on the diaphragm can be reduced (the component transmitted through the diaphragm and emitted to the front of the speaker can be reduced), and the sound quality can be improved.

  Moreover, compared with the case where a sound absorbing material is applied to the entire speaker cabinet, an equivalent sound absorbing effect can be expected while reducing the amount of the sound absorbing material used, and special and expensive materials are also easy to use.

[Third Embodiment]
Next, a speaker device according to a third embodiment of the present invention will be described with reference to FIG. FIG. 4 is a perspective view of the overall structure of the speaker device 400 shown through the speaker cabinet 102 for easy understanding.

  The speaker device 400 according to the present embodiment is different from the first embodiment in that a drone cone 401 is provided at the end of the sound path formed on the back surface of the diaphragm 101. Since other configurations and operations are the same as those of the second embodiment, the same configurations and operations are denoted by the same reference numerals, and detailed description thereof is omitted. The drone cone is only a diaphragm in which a driving part is omitted from a general speaker unit, and absorbs sound.

  In this way, a speaker unit with a small diameter is attached to the end of the reverse horn, and a back pressure damper (a kind of vibration absorber, that is, a sound absorber) is applied by applying a load using a passive element such as a resistor, capacitor, or coil to the coil output. Body). At this time, a speaker having a small diameter is sufficient and can be configured at low cost.

  In this embodiment, by placing a drone cone at the end of the reverse horn, the sound emitted from the back surface of the diaphragm 101 is guided to an acoustic path (reverse backload horn) whose cross-sectional area gradually decreases, The reflected wave can be effectively reduced. As a result, the adverse effect on the diaphragm can be reduced (the component transmitted through the diaphragm and emitted to the front of the speaker can be reduced), and the sound quality can be improved.

[Fourth Embodiment]
Next, various speaker devices according to the fourth embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a longitudinal sectional view taken along a plane passing through the central axis 110 of the diaphragm 101 in order to show an example of the end configuration of the sound path of the speaker device.

  In FIG. 5, the left cross-sections 501 to 503 are the same as those in the first, second, and third embodiments, and a description thereof is omitted. The upper right section 504 is obtained by opening the end of the sound path (reverse back load horn) without a sound absorbing material. The cross section 505 in the right middle is a sound absorbing material and the end of the sound path is opened. Furthermore, the lower right section 506 is a speaker unit 561 having a drive portion disposed at the end of the sound path.

  By opening the terminal ends as described above, the influence of the reflected wave on the back surface of the diaphragm is almost eliminated.

  By arranging the speaker unit 561 having a driving portion, it is possible to perform sound absorption of reflected waves and sound quality adjustment. In the case of the speaker unit 561, since a magnetic circuit and a coil are added, a voltage is generated at both ends of the coil by receiving sound pressure. A coefficient as a damper can be freely designed by connecting a passive element such as a resistor there. In other words, power is generated by the sound pressure collected by the reverse horn, and energy is consumed = sound absorption. A small-diameter speaker is used, and unlike a simple cylinder, standing waves are unlikely to occur. Moreover, it is more effective if it is used in combination with a general sound absorbing material to share sound absorption in different bands.

[Fifth Embodiment]
Next, a speaker device 600 according to a fifth embodiment of the present invention will be described with reference to FIG. FIG. 6 is a longitudinal sectional view 601 in which the speaker device 600 according to the present embodiment is cut along a plane passing through the central axis 110 of the diaphragm 101, and a horizontal sectional view 602 in which the speaker device 600 is cut along a plane perpendicular to the central axis 110. Represents. The speaker device 600 according to the present embodiment is different from the first embodiment in that the inner wall is not a cone shape but a cylindrical shape. Since other configurations and operations are the same as those in the first embodiment, the same configurations and operations are denoted by the same reference numerals, and detailed description thereof is omitted.

  According to this embodiment, manufacture is simplified by making the partition of a sound path into a cylinder. In addition, since the cross-sectional area of the sound path is decreased in steps of 1 → 2 → 3, reflected waves can be effectively reduced.

[Sixth Embodiment]
Next, a speaker device 700 according to a sixth embodiment of the present invention will be described with reference to FIG. FIG. 7 is a longitudinal sectional view 701 in which the speaker device 700 according to the present embodiment is cut along a plane passing through the central axis 110 of the diaphragm 101 and a horizontal sectional view 702 in which the speaker device 700 is cut along a plane perpendicular to the central axis 110. Represents. The speaker device 700 according to the present embodiment is different from the fifth embodiment in that the outer wall 721 and the inner walls 703 and 704 are not cylindrical but rectangular. Since other configurations and operations are the same as those of the fifth embodiment, the same configurations and operations are denoted by the same reference numerals, and detailed description thereof is omitted.

  According to this embodiment, the production is further simplified by making the partition of the sound path into a square tube. In addition, since the cross-sectional area of the sound path is decreased in steps of 1 → 2 → 3, reflected waves can be effectively reduced.

[Seventh Embodiment]
Next, a speaker device 800 according to a seventh embodiment of the present invention will be described with reference to FIG. FIG. 8 is a longitudinal sectional view 801 in which the speaker device 800 according to this embodiment is cut along a plane passing through the central axis 110 of the diaphragm 101, and a horizontal sectional view 802 in which the speaker device 800 is cut along a plane perpendicular to the central axis 110. Represents. The speaker device 800 according to the present embodiment is different from the sixth embodiment in that an inner wall 805 is provided further inside the inner wall 704. The inner wall 805 is disposed coaxially with the diaphragm 101 and extends in a rectangular tube shape from the rear surface of the diaphragm 101 to a position having a predetermined gap with the rear plate 122 of the speaker cabinet 102. Since other configurations and operations are the same as those of the sixth embodiment, the same configurations and operations are denoted by the same reference numerals, and detailed description thereof is omitted.

  According to this embodiment, since the sound path can be made longer than that in the sixth embodiment, reflected waves can be effectively reduced.

[Eighth Embodiment]
Next, a speaker device 900 according to an eighth embodiment of the present invention will be described with reference to FIG. FIG. 9 is a longitudinal sectional view 901 in which the speaker device 900 according to the present embodiment is cut along a plane passing through the central axis 110 of the diaphragm 101, and a horizontal sectional view 902 in which the speaker device 800 is cut along a plane perpendicular to the central axis 110. Represents. The speaker device 900 according to the present embodiment is different from the sixth embodiment in that an inner wall 906 is provided further inside the inner wall 805. The inner wall 906 is disposed coaxially with the diaphragm 101 and extends in a rectangular tube shape from the rear plate 122 of the speaker cabinet 102 to a position having a predetermined gap from the rear surface of the diaphragm 101. Since other configurations and operations are the same as those of the seventh embodiment, the same reference numerals are given to the same configurations and operations, and detailed descriptions thereof are omitted.

  According to this embodiment, since the sound path can be further increased compared to the seventh embodiment, the reflected wave can be effectively reduced. Also, the end can be either a closed type or an open type.

[Ninth Embodiment]
Next, speaker devices 1001 and 1002 according to a ninth embodiment of the present invention will be described with reference to FIG. FIG. 10 shows a cross-sectional view of the speaker devices 1001 and 1002 according to the present embodiment cut along a plane perpendicular to the central axis 110 of the diaphragm 101. The speaker device 1001 according to this embodiment is different from the sixth embodiment in that the inner wall 1003 is obtained by rotating the inner wall 703 by 90 degrees. Since other configurations and operations are the same as those of the sixth embodiment, the same configurations and operations are denoted by the same reference numerals, and detailed description thereof is omitted. The speaker device 1002 according to the present embodiment is different from the eighth embodiment in that the inner wall 1003 and the inner wall 1005 are obtained by rotating the inner walls 703 and 905 by 90 degrees. Since other configurations and operations are the same as those of the eighth embodiment, the same configurations and operations are denoted by the same reference numerals, and detailed description thereof is omitted.

  According to this embodiment, since inner walls can be joined, the intensity | strength and durability of a speaker apparatus can be raised as a result.

[Tenth embodiment]
Next, speaker devices 1101 and 1102 according to a tenth embodiment of the present invention will be described with reference to FIG. FIG. 11 shows a cross-sectional view of the speaker device 1100 according to the present embodiment cut along a plane perpendicular to the central axis 110 of the diaphragm 101.

  In the speaker device 1100 according to this embodiment, the inner wall 1103 rotates the inner wall 703 by a predetermined angle, the inner wall 1104 rotates the inner wall 704 by a predetermined angle, and the inner wall 1105 rotates the inner wall 705 by a predetermined amount, as compared with the sixth embodiment. It is different in that the angle is rotated. Since other configurations and operations are the same as those of the sixth embodiment, the same configurations and operations are denoted by the same reference numerals, and detailed description thereof is omitted.

  According to the present embodiment, the inner walls can be joined to each other. As a result, the strength and durability of the speaker device can be increased, and furthermore, the sound path at each turn can be changed by changing the installation angle and size of the square tube. The reduction rate of the cross-sectional area can be set freely.

[Eleventh embodiment]
Next, a speaker device according to another embodiment of the present invention will be described with reference to FIGS. 12 to 15 represent cross-sectional views of the speaker devices 1210 to 1260, 1300, 1410, and 1420 according to the present embodiment cut along a plane perpendicular to the central axis 110 of the diaphragm 101.

  The speaker device 1210 in FIG. 12 includes a triangular cylindrical side wall 1211 and inner walls 1213 and 1214. The speaker device 1220 includes a triangular cylindrical side wall 1211 and inner walls 1223 and 1214. The inner wall 1223 is obtained by rotating the inner wall 1213 by 60 degrees, so that the inner walls can be joined to each other.

  The speaker device 1230 in FIG. 12 includes a five-cylinder-shaped side wall 1231 and inner walls 1233 and 1234. The speaker device 1240 includes a triangular cylindrical side wall 1231 and inner walls 1243 and 1234. The inner wall 1243 is obtained by rotating the inner wall 1233 by 36 degrees, so that the inner walls can be joined to each other.

  Of course, any shape of the sidewalls is rotationally symmetric with respect to the central axis of the diaphragm. Then, from the cross-sectional area of the space formed between the side wall and the first inner wall in a plane perpendicular to the central axis of the diaphragm, the space formed between the first inner wall and the second inner wall The cross-sectional area is smaller.

  A speaker device 1300 in FIG. 13 includes a rectangular cylindrical side wall 1331 and inner walls 1333, 1334, 1335. The inner walls 1333 and 1335 are in the shape of a rhombus, whereby the side wall 1331 and the inner wall 1333, the inner wall 1333 and the inner wall 1334, the inner wall 1334 and the inner wall 1335 can be joined, and the strength can be improved. In this way, when the front image is, for example, a quadrangle, the same structure can be maintained on both sides of a straight line passing through the center of the speaker unit even if the rectangles have different aspect ratios.

  Like speaker device 1400 of Drawing 14, you may comprise by inner walls 1402-1403 which partition the space which triangular outer wall 1401 forms, and cylinder 1404 arranged at the center. Furthermore, as in the speaker device 1500 of FIG. 15, a rhombus inner wall 1502 that partitions the space formed by the square outer wall 1501 and a cylinder 1503 arranged at the center may be included.

[Other Embodiments]
While the present invention has been described with reference to the embodiments, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention. In addition, a system or an apparatus in which different features included in each embodiment are combined in any way is also included in the scope of the present invention.

Claims (9)

A diaphragm that generates sound according to the input drive signal;
A speaker cabinet in which the diaphragm is accommodated on the front side and side walls are arranged so as to be rotationally symmetric with respect to the central axis of the diaphragm;
A first inner wall that is arranged coaxially with the diaphragm, and extends in a cylindrical shape from the rear surface of the diaphragm to a position having a predetermined gap from the rear plate of the speaker cabinet;
A second inner wall that is arranged coaxially with the diaphragm, and extends in a cylindrical shape from the rear inner surface of the speaker cabinet to a position having a predetermined gap with the rear surface of the diaphragm, inside the first inner wall;
With
It is formed between the first inner wall and the second inner wall from the sectional area of the space formed between the side wall and the first inner wall in a plane perpendicular to the central axis of the diaphragm. A speaker device having a smaller space cross-sectional area.   The speaker device according to claim 1, wherein the speaker cabinet is a cylindrical housing disposed coaxially with the diaphragm.   The speaker device according to claim 1, wherein the speaker cabinet is a rectangular tube-shaped casing disposed coaxially with the diaphragm.   4. The speaker device according to claim 1, wherein the first inner wall has a cone shape having a diameter that increases from the rear surface of the diaphragm toward the rear of the diaphragm.   4. The speaker device according to claim 1, wherein the second inner wall has a cone shape having a diameter that increases from a rear inner surface of the speaker cabinet toward a rear of the diaphragm.   The speaker device according to any one of claims 1 to 5, wherein a sound absorbing material that absorbs vibration transmitted from the diaphragm is provided in the second inclined cylinder.   The speaker device according to any one of claims 1 to 6, wherein a small speaker that absorbs vibration transmitted from the diaphragm is provided on a back plate of the speaker cabinet in the second inclined cylinder.   The speaker device according to claim 7, wherein the small speaker is a drone cone system.   The speaker device according to claim 7, wherein the small speaker is vibrated in synchronization with the drive signal.

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