JP6598725B2 - Speaker - Google Patents

Description

  The present invention relates to a speaker in which a phase plug protruding forward in the sound generation direction is provided at the center of a diaphragm.

  Patent Document 1 describes an invention relating to a speaker having a phase adjuster (phase plug).

  In this speaker, a center projection of a pole piece is provided at the center of the diaphragm, and a phase adjuster is fixed in front of the center projection. In the phase adjuster, a base portion is formed to have the same diameter as the center protrusion, and a tapered surface portion that tapers forward is provided at the tip portion.

  In Patent Document 1, if a phase adjuster is provided, it is possible to harmonize sound waves in a state close to a spherical wave by preventing mutual interference of radiant energy on the diaphragm, and to suppress disturbance of wide frequency characteristics. It is explained that the wide-area characteristics can be extended.

JP 2001-245380 A

  The speaker differs in depth in the front-rear direction between the outer edge portion and the center portion of the diaphragm according to the difference in the diameter of the diaphragm. Therefore, it is necessary to set the dimension of the phase adjuster (phase plug) projecting forward from the center protrusion to an optimum dimension according to the depth of the diaphragm in the front-rear direction.

  However, as described in Patent Document 1, the conventional speaker has a structure in which the phase adjuster (phase plug) is fixed to the center protrusion, so that it depends on the depth of the diaphragm in the front-rear direction. Thus, it is necessary to prepare a phase adjuster having different length dimensions. That is, it is necessary to manufacture many types of phase adjusters having different dimensions according to the type of speaker, leading to an increase in manufacturing cost.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a speaker capable of using a phase plug having the same structure even if the depth dimensions of the diaphragm are different. It is said.

The present invention provides a diaphragm having a shape that is recessed backward from the outer edge of the sound generation direction, a frame that supports the diaphragm, and the diaphragm supported by the frame to drive the diaphragm. In a speaker having a magnetic circuit section to be performed and a phase plug disposed in a central opening of the diaphragm,
In the phase plug, at least a base piece positioned on the frame side and a tip piece positioned in front of the phase piece are connected, and at least a part of the tip piece gradually has a cross-sectional area toward the front. Formed small,
One of the base piece and the tip piece is provided with an abutting portion, and the other is provided with a plurality of receiving portions with which the abutting portion is selectively abutted, and the receiving portion is a virtual extending in the sound generation direction. The position in the front-rear direction differs depending on the rotation angle around the center line, which is a line, and by selecting the receiving portion with which the abutting portion comes into contact, the sound generation direction of the phase plug This is characterized in that the height dimension of the is changed.

  In the speaker of the present invention, for example, the abutting portion is a tip portion of the projecting portion, and the receiving portion is a bottom portion of the concave portion.

  In the speaker of the present invention, it is preferable that a connection portion between the base piece and the tip piece is provided with a circumferential fitting portion that is continuous or intermittent around the center line.

  Furthermore, in the speaker of the present invention, it is preferable that the base piece and the tip piece are fixed to each other by a connecting shaft extending along the center line.

  The phase plug of the speaker of the present invention is composed of at least a front piece and a base piece. The height dimension of the phase plug in the front-rear direction can be made different by connecting the front piece and the base piece while changing the relative angle in the rotational direction around the center line. The same phase plug can be used as a common component for multiple types of loudspeakers with different diaphragm diameters and front and rear depth dimensions. Manufacturing cost can be reduced while maintaining.

The partially exploded perspective view which shows the speaker of the 1st Embodiment of this invention, Sectional drawing which shows the speaker of the 1st Embodiment of this invention, The partially exploded perspective view which shows the speaker of the 2nd Embodiment of this invention, Sectional drawing which shows the speaker of the 2nd Embodiment of this invention, The phase plug used in common with the speaker of 1st Embodiment and the speaker of 2nd Embodiment is shown, (A) is the perspective view which looked at the front piece from back, (B) The perspective view which looked at the base piece from the front, (A) is an enlarged sectional view showing the phase plug attached to the speaker of the first embodiment of the present invention, and (B) shows the phase plug attached to the speaker of the second embodiment of the present invention. Enlarged cross-sectional view,

  1 and 2 show a speaker 1 according to a first embodiment of the present invention, and FIGS. 3 and 4 show a speaker 2 according to a second embodiment of the present invention. In the speaker 1 and the speaker 2, members having the same function are denoted by the same reference numerals. In each figure, the Z1 direction is the front of the sound generation direction of the speaker, and the Z2 direction is the rear of the sound generation direction. O is the center line.

  The speaker 1 of the first embodiment and the speaker 2 of the second embodiment have a frame 11. The frame 11 is made of a synthetic resin or a nonmagnetic light alloy. The frame 11 has an opening edge portion 11a facing forward (Z1 direction) and a support portion 11b facing rearward (Z2 direction). The cross-sectional area of the support portion 11b is smaller than the opening area of the opening edge portion 11a.

  The structure of the frame 11 is similar between the speaker 1 of the first embodiment and the speaker 2 of the second embodiment, but the opening edge 11a of the frame 11 in the speaker 1 of the first embodiment. Are larger than the frame 11 in the speaker 2 of the second embodiment. The depth dimension of the frame 11 in the front-rear direction (Z1-Z2 direction) is also larger for the speaker 1 than for the speaker 2.

  A diaphragm 12 is supported on the frame 11. The diaphragm 12 is formed of paper, a synthetic resin film, or a composite thereof, and has a so-called cone shape corresponding to a part of a substantially conical shape. The diaphragm 12 has an outer edge portion 12a facing forward (Z1 direction) and a central portion 12b facing rearward (Z2 direction). An opening 12c is formed in the central portion 12b. The outer diameter of the outer edge portion 12a of the diaphragm 12 in the speaker 1 of the first embodiment is larger than that of the diaphragm 12 in the speaker 2 of the second embodiment. The depth dimension of the vibrating body 12 in the front-rear direction (Z1-Z2 direction) is also larger for the speaker 1 than for the speaker 2. However, in the speaker 1 and the speaker 2, the opening diameter of the opening 12c in the central portion 12b is substantially the same.

  In both the speaker 1 and the speaker 2, the opening edge portion 11a of the frame 11 and the outer edge portion 12a of the diaphragm 12 are connected by the front edge member 13, and the middle part of the frame 11 and the center portion 12b of the diaphragm 12 are dampers. The members 14 are connected. The edge member 13 supports the diaphragm 12 on the frame 11 so as to vibrate freely, and the damper member 14 has a function of attenuating the vibration of the diaphragm 12.

  In the speakers 1 and 2, the magnetic circuit unit 20 is fixed to the support portion 11 b of the frame 11. 6A and 6B, the magnetic circuit unit 20 has an outer yoke 21, and a cylindrical inner yoke 23 is fixed on the central portion 21 a of the outer yoke 21. The ring-shaped magnet 22 is fixed to the outer periphery of the inner yoke 23. The outer yoke 21 and the inner yoke 23 are made of a magnetic metal material. As shown in FIGS. 6A and 6B, a magnetic gap G is formed between the outer yoke 21 and the magnet 22. The inner yoke 23 in the magnetic circuit part 20 is a center pole part.

  As shown in FIGS. 2 and 4, in the speaker 1 and the speaker 2, a bobbin 24 extending rearward (Z2 direction) is fixed to the center portion of the diaphragm 12, and a voice coil is wound around the bobbin 24. A part of the bobbin 24 and the voice coil are inserted into the magnetic gap G.

  A phase plug 30 is fixed in front of the inner yoke 23 (center pole portion) of the magnetic circuit portion 20. A common phase plug 30 is fixed to the speaker 1 of the first embodiment and the speaker 2 of the second embodiment. As shown in FIGS. 5A and 5B and FIGS. 6A and 6B, the phase plug 30 is configured by connecting at least a base piece 31 and a front piece 32. The base piece 31 and the tip piece 32 are formed of a synthetic resin material.

  Each of the base piece 31 and the tip piece 32 may be composed of one member, or each may be composed of a plurality of members. In the embodiment shown in FIGS. 5A and 5B and FIGS. 6A and 6B, the tip piece 32 is composed of two members, a central member 33 and a tip member 34. The outer peripheral surface of the central member 33 is a cylindrical surface, and the tip member 34 is a tapered member whose cross-sectional area gradually decreases toward the front (Z1 direction). The central member 33 and the tip member 34 are fitted by a concave / convex fitting portion 35 and fixed by an adhesive or the like.

  As shown in FIG. 5A, the front piece 32 is formed with a central cylindrical portion 32a that integrally extends rearward from the central portion, and an opening 32b is formed at the center of the central cylindrical portion 32a. A circumferential fitting portion 32c formed concentrically with the central tube portion 32a is integrally formed at the rear portion of the tip piece 32. The circumferential fitting portion 32c has a cylindrical inner circumferential surface 32d.

  In the tip piece 32, a plurality of protrusions 36 are integrally formed between the central tube portion 32a and the circumferential fitting portion 32c. Each protrusion 36 is parallel to the center line O and extends rearward (Z2 direction), and a tip surface facing the rear of each protrusion 36 serves as an abutting portion 36a. In the embodiment shown in FIG. 5A, three abutting portions 36a are provided, and the abutting portions 36a are provided at an angular interval of 120 degrees with the center line O as the center.

  As shown in FIG. 5B, the base piece 31 is formed with a central hole 31a penetrating the central portion in the front-rear direction. As shown in FIGS. 6A and 6B, the base piece 31 is integrally formed with a fitting protrusion 31b that protrudes rearward (in the Z2 direction) at the center. The outer peripheral surface 31c of the base piece 31 is a cylindrical surface.

  As shown in FIG. 5 (B), the base piece 31 has a plurality of recesses that open toward the front (Z1 direction). The concave portion includes a first concave portion 37a, a second concave portion 37b, a third concave portion 37c, and a fourth concave portion 37d, and three sets thereof are provided, and the concave portions are provided at a total of 12 locations. The base piece 31 is provided with three abutting portions 36a, but one set of concave portions 37a, 37b, 37c, 37d is selected and opposed to the one abutting portion 36a. ing.

  As shown in FIG. 5B, the recesses are arranged around the center line O at equal intervals. When the recesses 37a, 37b, 37c, and 37d are made into one set, since the recesses are formed in 12 groups at 3 sets, the respective recesses are arranged at intervals of 30 degrees in the rotation direction. The four recesses constituting one set are arranged in the order of 37a, 37b, 37c, 37d in the clockwise direction.

  The bottom of the first recess 37a is the first receiving portion 38a, the bottom of the second recess 37b is the second receiving portion 38b, the bottom of the third recess 37c is the third receiving portion 38c, and the fourth The bottom of the concave portion 37d is a fourth receiving portion 38d. In FIG. 5B, the first receiving portion 38a, which is the bottom of the shallowest first concave portion 37a provided at three places, can be seen. 6A, the first receiving portion 38a at the bottom of the first recessed portion 37a and the third recessed portion 37c located on the opposite side of the first receiving portion 38a across the center line O are shown. And a third receiving portion 38c at the bottom thereof. 6B, the second receiving portion 38b at the bottom of the second recessed portion 37b and the fourth recessed portion 37d located on the opposite side of the second receiving portion 38b across the center line O are shown. And a fourth receiving part 38d at the bottom is shown.

  As shown in FIGS. 6A and 6B, the first receiving portion 38a is located at the foremost (Z1 direction), and the second receiving portion 38b, the third receiving portion 38c, and the fourth receiving portion. In the order of 38d, it is retracted backward (Z2 direction) step by step. That is, the first receiving portion 38a, the second receiving portion 38b, the third receiving portion 38c, and the fourth receiving portion 38d are positioned in the front-rear direction stepwise by 30 degrees around the center line O clockwise. It is different. Note that the positions of the receiving portions 38a, 38b, 38c, and 38d in the front-rear direction are formed so as to retreat in order around the center line O. However, the receiving portions are randomly arranged around the center line O, not sequentially. The positions in the front-rear direction may be different.

  Next, a method for assembling the phase plug 30 to the speaker 1 of the first embodiment and the speaker 2 of the second embodiment will be described.

  The tip piece 32 of the phase plug 30 is assembled by fitting the center member 33 and the tip member 34 with the concave-convex fitting portion 35. At this time, the central member 33 and the tip member 34 are fixed with an adhesive or the like with the nut member 41 sandwiched between the center member 33 and the tip member 34.

  The phase plug 30 connects the base piece 31 and the front piece 32 in combination, but by changing the rotational phase around the center line O of the base piece 31 and the front piece 32, the phase plug 30 can be moved back and forth (Z1-Z2). Direction) height dimension can be changed.

  The speaker 1 of the first embodiment shown in FIG. 1 and FIG. 2 has a large diameter of the outer edge portion 12a of the diaphragm 12, and the front-rear direction (Z1-Z2 direction) between the outer edge portion 12a and the center portion 12b of the diaphragm 12 ) The depth dimension is large. Therefore, as shown in FIG. 6A, the phase plug 30 needs to increase the height dimension H <b> 1 ahead from the front surface of the magnetic circuit unit 20. Therefore, the three protrusions 36 of the tip piece 32 are respectively inserted into the first recesses 37a of the base piece 31, and the abutting part 36a at the tip of the protrusion 36 is located at the bottom of the first recess 37a. It abuts against the first receiving portion 38a. Since the first receiving portion 38a is located in the forefront (Z1 direction) in the base piece 31, the phase plug 30 can be inserted by inserting the three protrusions 36 into the first recesses 37a, respectively. Can be maximized.

  On the other hand, in the speaker 2 of the second embodiment shown in FIGS. 3 and 4, the diameter of the outer edge portion 12a of the diaphragm 12 is small, and the front-rear direction between the outer edge portion 12a and the center portion 12b of the diaphragm 12 ( The depth dimension in the (Z1-Z2 direction) is also small. Therefore, as shown in FIG. 6 (B), the phase plug 30 needs to shorten the height dimension H2 ahead from the front surface of the magnetic circuit unit 20. Therefore, the three protrusions 36 of the tip piece 32 are respectively inserted into the fourth recesses 37d of the base piece 31, and the abutting part 36a at the tip of the protrusion 36 is located at the bottom of the fourth recess 37d. It abuts against the fourth receiving portion 38d. Since the fourth receiving portion 38d is located at the most rearward (Z2 direction) in the base piece 31, the phase plug 30 can be obtained by inserting the three protrusions 36 into the fourth recesses 37d, respectively. Can be minimized.

  Further, the protrusion 36 of the tip piece 32 is inserted into the second recess 37b of the base piece 31, and the abutting part 36a is abutted against the second receiving part 38b, thereby reducing the height dimension of the phase plug 30. , H1 and H2 can be set slightly shorter than H1. Further, by inserting the protrusion 36 of the front piece 32 into the third recess 37c of the base piece 31 and abutting the abutting part 36a against the third receiving part 38c, the height dimension of the phase plug 30 can be reduced. , H1 and H2 can be set even shorter when the second receiving portion 38b is used.

  Further, if the width dimension in the circumferential direction of the protrusion 36 of the front piece 32 is substantially matched with the opening width in the circumferential direction of the recesses 37 a, 37 b, 37 c, and 37 d of the base piece 31, the protrusion 36. Can be coupled so that the base piece 31 and the tip piece 32 do not rotate around the center line O in a state in which is inserted into any of the recesses 37a, 37b, 37c, and 37d. Further, the base piece 32 and the front piece 32 are crossed with the center line O by fitting the peripheral fitting portion 32 c of the front piece 32 to the outer peripheral surface 31 c of the base piece 31 with almost no gap. Can be connected so that they do not move relative to each other.

  As shown in FIGS. 6 (A) and 6 (B), a fitting recess 23a is formed in the entire central portion of the inner yoke 23 constituting the center piece portion. The phase plug 30 in which the base piece 31 and the tip piece 32 are connected as described above is installed in front of the inner yoke 23. At this time, the fitting protrusion 31b protruding rearward (Z2 direction) from the bottom of the base piece 31 is fitted into the fitting recess 23a to position the phase plug 30.

  Then, the connecting shaft 42 is inserted so as to penetrate the outer yoke 21 and the inner yoke 23, and further inserted into the base piece 31 and the tip piece 32, and a male screw portion 42 a formed at the front portion of the connecting shaft 42. Is screwed onto the nut member 41. Thereby, even if the height dimension H1 is large as shown in FIG. 6 (A) or the height dimension H2 is small as shown in FIG. It can be positioned and fixed forward.

  In the sound generation operation of the speakers 1 and 2, when a voice coil wound around the bobbin 24 is energized, a magnetic field is excited in the voice coil. The diaphragm 12 is driven and sounded by the electromagnetic force generated by the magnetic field and the magnetic flux crossing the magnetic gap G of the magnetic circuit unit 20.

  As shown in FIG. 2 and FIG. 4, the speaker 1 and the speaker 2 both have a phase plug 30 fixed at an optimal height at the center of the diaphragm 12. It can suppress that the sound pressure emitted ahead (Z1 direction) interferes in the center part, and can improve sound quality. Moreover, even if the diameter of the diaphragm 12 and the depth in the front-rear direction are different, the same phase plug 30 can be used, so that the assembly cost can be reduced.

  Contrary to the above-described embodiment, a plurality of abutting portions 36a are formed in the base piece 31, the concave portions 37a, 37b, 37c, 37d, and receiving portions 38a, 38b of these bottom portions are formed in the tip piece 32. , 38c, 38d may be formed.

  Further, the circumferential fitting portion 32 c may be formed on the base piece 31 instead of the front piece 32. Moreover, the circumferential fitting part 32c may be provided intermittently in the circumferential direction.

  Further, it is not always necessary to provide a plurality of abutting portions 36a, and only one abutting portion 36a may be provided.

1, 2 Speaker 11 Frame 12 Diaphragm 12a Outer edge part 12b Center part 12c Opening part 20 Magnetic circuit part 30 Phase plug 31 Tip piece 31 Base piece 32 Tip piece 36 Projection 36a Butting part 37a, 37b, 37c, 37d Recesses 38a, 38b, 38c, 38d Receiving part 42 Connecting shaft O Center line H1, H2 Height dimension

Claims (4)

A diaphragm having a shape that is recessed backward from the outer edge of the sound generation direction, a frame that supports the diaphragm, and a magnetic circuit unit that is supported by the frame and drives the diaphragm And a speaker having a phase plug disposed in the central opening of the diaphragm,
In the phase plug, at least a base piece positioned on the frame side and a tip piece positioned in front of the phase piece are connected, and at least a part of the tip piece gradually has a cross-sectional area toward the front. Formed small,
One of the base piece and the tip piece is provided with an abutting portion, and the other is provided with a plurality of receiving portions with which the abutting portion selectively abuts, and the receiving portion is a virtual extending in the sound generation direction. The position in the front-rear direction differs depending on the rotation angle around the center line, which is a line, and by selecting the receiving portion with which the abutting portion comes into contact, the sound generation direction of the phase plug A speaker characterized in that the height dimension of the speaker changes.   The speaker according to claim 1, wherein the abutting portion is a tip portion of a projecting portion, and the receiving portion is a bottom portion of a concave portion.   The speaker according to claim 1, wherein a peripheral fitting portion that is continuous or intermittent around the center line is provided at a connection portion between the base piece and the tip piece.   The speaker according to any one of claims 1 to 3, wherein the base piece and the tip piece are fixed to each other by a connecting shaft extending along the center line.

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