JP2005229551A - Multifunctional speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multifunctional speaker which eliminates an adverse influence caused by an electromagnetic wave from the outside by shielding the electromagnetic wave. <P>SOLUTION: In a multifunctional speaker 1, a magnetic circuit section (movable portion) 16 comprised of a pole piece 13, a magnet 14 and a top plate 15 is elastically supported by a support spring A12 and a support spring B22 each of which is buried in a frame 11 while linking its annular outer edge and its annular inner edge through a plurality of arcuate arms. A diaphragm 23 is fitted on the step of the frame 11. A coil 24 is positioned within a magnetic gap 16a which is a gap between a center pole 13a and the top plate 15. A cylindrical portion 11a of the frame 11 is covered with a protector A17 and a protector B18 through spacers 31, 32. A projection 22a of the support spring B22 is in contact with inner walls of the protector A17. A connecting portion 17b of the protector A17 extends on a GND terminal 21 and is soldered therewith. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a multifunctional speaker with a vibration function that is incorporated in a mobile communication device such as a mobile phone or a PDA, a game device, or the like and notifies a user of an incoming call by vibration.

  Conventionally, mobile communication devices such as mobile phones and PDAs generally have a function of generating a buzzer sound or a melody sound to notify the user of an incoming call, and a function of vibrating the housing of the device without making a sound. For this purpose, a structure has been adopted in which a speaker for generating sound similar to a small speaker and a vibrating body that generates vibration by rotating an eccentric weight with a small motor have been adopted. It was. However, incorporating both the speaker and the vibrator in this manner is disadvantageous in terms of downsizing and cost reduction of the device. Therefore, in recent years, a multi-function speaker that generates both sound and vibration with a single one has been used (for example, see Patent Document 1).

  An example of this type of conventional multi-function speaker will be described with reference to the drawings. FIG. 5A is a plan view of a conventional multi-function speaker. FIG. 5B is a partial cross-sectional side view showing a DD cross section of FIG. 5A, and FIG. 5C is a bottom view of this multifunction speaker.

  First, the configuration of this multifunction speaker will be described. 5 (a) and 5 (b), 51 is a multifunctional speaker with a vibration function, 61 is a frame which is a substantially cylindrical resin molded product, and a part of the outer wall of the cylindrical portion 61a is outside. A bulge portion 61b is formed. An upper step portion 61c and a lower step portion 61d are formed in the cylindrical portion 61a. Reference numeral 72 denotes a support spring B in which an annular outer peripheral portion and an annular inner peripheral portion embedded in the inner wall of the frame 61 are connected by a plurality of arc-shaped arm portions.

  Reference numeral 13 denotes a pole piece including a center pole 13a, which is a magnetic body, and a flange 13b. The flange 13b is fixed to the inner peripheral portion of the support spring B72. Reference numeral 14 denotes an annular magnet fixed on the flange 13b, and 15 denotes a top plate made of an annular magnetic body fixed on the magnet 14. Reference numeral 16 denotes a magnetic circuit part (movable part) composed of a pole piece 13, a magnet 14 and a top plate 15. A magnetic gap 16a is formed between the inner periphery of the top plate 15 and the outer periphery of the center pole 13a.

  Reference numeral 67 denotes a substantially disk-shaped metal protector A for protecting the inside of the frame 61, and the protector A67 has a plurality of sound emitting holes 67a. Reference numeral 81 denotes an L-shaped ring arranged so as to sandwich the diaphragm between the upper step portion 61 c of the frame 61, and the outer periphery of the protector A 67 is crimped to the ring 81. 68 is a substantially dish-shaped metal protector B in which a plurality of air escape holes 68a are formed. The protector B68 has a frame 61 with a ring-shaped spacer B32 sandwiched between the lower step 61d to which a support spring B72 is fixed. It is fixed to.

  Next, 19 and 20 are a (+) terminal and a (−) terminal having a U-shaped cross section inserted into the slit of the bulging portion 61 b of the frame 61, and both ends are bent and joined after the insertion. It is a connection terminal. Reference numeral 25 denotes solder at the joint. A resin 26 protects 25 parts of the solder. Reference numeral 12 denotes a support spring A in which an annular outer peripheral portion bonded to the frame 61 and an annular inner peripheral portion are connected by a plurality of arc-shaped arm portions, and the inner peripheral portion is fixed to the top plate 15. . Thus, the magnetic circuit part (movable part) 16 is elastically supported by the frame 61 by the support spring A12 and the support spring B72.

  Reference numeral 23 denotes a diaphragm made of a plastic material, and an outer edge portion thereof is fixed to the upper step portion 61 c of the frame 61. Reference numeral 24 denotes a coil wound in a cylindrical shape, and a pair of coil terminals 24 a are soldered to the (+) terminal 19 and the (−) terminal 20. The coil 24 is bonded and fixed to the lower surface of the diaphragm 23 and is located in a magnetic gap 16 a that is a gap formed by the center pole 13 a and the top plate 15.

Next, the operation of the multifunction speaker 51 will be described. Depending on the frequency of the drive signal input to the coil 24, the diaphragm 23 vibrates and emits sound due to the mutual interference action between the magnetomotive force generated in the coil 24 and the magnetic force of the magnet 14, or the coil 24 and the magnetic circuit unit ( Although the relative displacement with respect to the movable portion 16 occurs, since the magnetic circuit portion (movable portion) 16 is elastically supported by the frame 61, the magnetic circuit portion (movable portion) 16 vibrates, and this vibration further occurs. It is transmitted to the frame 61, and the housing of the device to which the multi-function speaker 51 is attached can resonate and feel the vibration of the human body, for example, the fingertip of the hand, etc. in contact therewith.
JP 2001-2225010 (FIG. 1, paragraphs 0016 to 0019)

  However, in the conventional multi-function speaker having such a configuration, the magnetic circuit operates due to the influence of electromagnetic waves from the outside of the speaker, which causes electromagnetic noise to the electronic components inside the device, thereby adversely affecting the sensitivity. There was a problem of bringing.

  The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a multi-function speaker that blocks external electromagnetic waves and does not have an adverse effect due to this.

  In order to achieve the above-mentioned object, the means of the present invention comprises a pole piece, a magnet fixed on the pole piece, and a top plate fixed on the magnet to form a magnetic circuit portion, which is embedded in a frame. The magnetic circuit portion is elastically supported in the frame by a support spring, the coil is fixed to a diaphragm fixed to the frame, and the coil is positioned in a magnetic gap that is a gap between the pole piece and the top plate. In addition, in the multi-function speaker in which protectors are disposed on the upper and lower surfaces of the frame, the protectors are fitted to each other and cover the entire frame excluding the bulging portion.

  Further, a groove is provided on the outer peripheral portion of one of the protectors, a bent portion that engages with the groove is provided on the outer periphery of the other protector, and the bent portion is engaged with the groove.

  Further, the bulging portion is provided with a ground terminal in addition to the external connection terminals (+) and (−).

  The ground terminal is electrically connected to the protector.

  Further, the magnetic circuit unit is electrically connected to the protector through the support spring.

  The ground terminal is connected to either the external connection terminal (+) or (-) of the coil.

  According to the present invention, a magnetic circuit portion is formed by a magnet fixed on the pole piece and a top plate fixed on the magnet, and the magnetic circuit portion is placed in the frame by a support spring embedded in the frame. The coil is fixed to a diaphragm fixed to the frame, and the coil is positioned in a magnetic gap that is a gap between the pole piece and the top plate, and protectors are respectively arranged on the upper and lower surfaces of the frame. In the provided multi-function speaker, the protector covers the entire frame except for the bulging portion by fitting with each other, so that a multi-function speaker that blocks external electromagnetic waves and has no adverse effects due to this can be obtained. It was.

  Hereinafter, the best embodiment of the present invention will be described in detail with reference to the drawings. 1 is a plan view of the multi-function speaker, FIG. 2 is a cross-sectional view showing the AA cross section of FIG. 1, FIG. 3 is a partial cross-sectional view showing the BB cross section of FIG. 1, and FIG. It is a fragmentary sectional view which shows C cross section.

  First, the structure of the multifunction speaker which is embodiment of this invention is demonstrated. 1 to 4, reference numeral 1 denotes a multi-function speaker, 11 denotes a frame which is a resin molded product, and includes a substantially cylindrical cylindrical portion 11a and a bulging portion 11b in which a part of its outer surface bulges. Have. Reference numeral 21 denotes a U-shaped GND terminal inserted into a slit formed in the bulging portion 11b, which is bent after insertion and overlaps both ends. Reference numeral 17 denotes a cylindrical metal protector A with a bottom plate. A plurality of sound emission holes 17a are formed in the bottom plate of the protector A17, and a part of the cylindrical portion is cut away to allow the bulging portion 11b to escape.

  Moreover, the connection part 17b is left in the part of the notched part in the shape of a tongue piece. The connecting portion 17b of the protector A17 is bent and pulled out and soldered on the GND terminal 21. Reference numeral 18 denotes a protector B having substantially the same shape as the protector A17, and a plurality of escape holes 18a are formed in the bottom plate. As shown in FIG. 3, the outer wall of the protector A <b> 17 covers the entire frame 11 except for the connecting portion with the bulging portion 11 b by fitting with the inner wall of the protector B <b> 18. A groove 17c, which is a plurality of long windows, is provided on the outer peripheral portion of the protector A17, and a bent portion 18b that is fitted into and engaged with the groove 17c is provided on the outer peripheral portion of the protector B18. Electrically connected.

  Reference numeral 22 denotes a support spring B, and a protruding portion 22a having a part of the outer periphery protruding in a tongue-like shape is bent upward along a recess formed in the outer wall of the cylindrical portion 11a of the frame 11, and is formed on the inner wall of the protector A17. It is in pressure contact. Reference numeral 31 denotes a ring-shaped spacer A, which is disposed on the upper step portion 11c of the cylindrical portion 11a with the peripheral edge portion of the diaphragm 23 interposed therebetween. The protector A17 is positioned in the height direction by the spacer A31. The protector B18 is positioned in the height direction by the lower end surface of the cylindrical portion 11a and the spacer B32 disposed with the support spring B22 sandwiched between the lower stepped portion 11d.

  The multi-function speaker 1 of the present invention is different from the conventional multi-function speaker 51 as described above, and the other parts are the same as those of the conventional multi-function speaker 51. Detailed description is omitted using the same reference numerals and names. The multi-function speaker of the present invention is not limited to the embodiment described above. For example, the frame may be formed of two bodies of a first frame and a second frame, The magnetic circuit portion is not limited to the above-described outer magnet type, but may be an inner magnet type in which a magnet and a top plate are joined to the center of a flat bottom pan-shaped pole piece. Further, one of the two elastic support springs may be omitted.

  Next, effects of the embodiment of the present invention will be described. The multi-function speaker 1 is not affected by electromagnetic waves from the outside because the magnetic circuit section 16 is enclosed by the metal protector A17 and the protector B18. Further, since the protector A17 is provided with the groove 17c and the protector B18 is provided with the bent portion 18b and engaged with each other, they can be firmly fixed to each other. Since the magnetic circuit unit 16 is electrically connected to the protector A17 and the protector B18 via the support spring B22 and further connected to the GND terminal 21, it is possible to prevent the adverse effect of electromagnetic waves on the external components. If it is used for small devices such as game machines and telephones, vibrations can be experienced with the fingertips of the hand. Further, since the magnetic circuit part (movable part) 16 is supported by the two elastic support springs, the support spring A12 and the support spring B22, the movement of the movable part accompanying vibration is more stable than in the case of one spring. As a result, no unpleasant vibration sound is generated even when it is pressed against the ear with an impact.

  The multifunctional speaker of the present invention can be widely applied to mobile communication devices such as mobile phones and PDAs, game devices, and the like.

It is a top view of the multifunction type speaker which is an embodiment of the invention. It is sectional drawing which shows the AA cross section of FIG. It is a fragmentary sectional view which shows the BB cross section of FIG. It is a fragmentary sectional view which shows CC cross section of FIG. It is a top view of the conventional multifunction type speaker. It is sectional drawing of the conventional multifunction type speaker. It is a bottom view of the conventional multifunction type speaker.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Multifunctional speaker 11 Frame 11b Protruding part 12 Support spring A
13 Pole piece 14 Magnet 15 Top plate 16 Magnetic circuit part (movable part)
16a Magnetic gap 17 Protector A
17c Groove 18 Protector B
18b bent portion 19 (+) terminal 20 (-) terminal 21 ground terminal 22 support spring B
23 Diaphragm 24 Coil

Claims (6)

  A magnetic circuit part is formed by a pole piece, a magnet fixed on the pole piece, and a top plate fixed on the magnet, and the magnetic circuit part is elasticated in the frame by a support spring embedded in the frame. A coil is fixed to a diaphragm that is supported and fixed to the frame. The multi-function speaker according to claim 1, wherein the protector covers the entire frame except the bulging portion by fitting with each other.   2. A groove is provided on an outer peripheral portion of one of the protectors, a bent portion that engages with the groove is provided on an outer periphery of the other protector, and the bent portion is engaged with the groove. The multifunctional speaker described.   The multifunction speaker according to claim 1 or 2, wherein a ground terminal is provided in the bulging portion in addition to the external connection terminals (+) and (-).   The multifunction speaker according to claim 3, wherein the ground terminal is electrically connected to the protector.   The multifunction speaker according to any one of claims 1 to 4, wherein the magnetic circuit unit is electrically connected to the protector via the support spring. The multifunction speaker according to any one of claims 1 to 5, wherein the ground terminal is connected to either the external connection terminal (+) or (-).

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