JP2001225010A - Multi-functional sound generating body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To materialize a multi-functional sound generating body which generates both sound and vibration by using an external magnet type magnetic circuit part to be small in size, high in performance, and low in price. SOLUTION: On the upper surface side of the magnetic circuit part 33 comprising a magnet 37, a pole piece 38, and a top plate 39, the inside part of a support spring A (36) which has the inside part and a circular outside part and is formed in a shape in which the parts are connected by arc-shaped arm parts is fixed and the outside part is fixed to a cover and supported. A support spring B in a shape in which the spring A is rotated at 90 deg. is used on the lower surface side, and both surfaces of the circuit part are supported. The circuit part and the springs A, B are positioned by engaging round holes in the middle of springs with circular step parts formed on the upper surface of the top plate and on the lower surface of the pole piece. Since the springs are circular, cases are made circular and can be miniaturized. Since the upper and lower surface of the circuit part are supported, the part is not slanted, and its action is stabilized. Since the springs are positioned by the step parts and the round holes, the mutual centering of parts is simple and exact.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multifunctional sound generator incorporated in a mobile communication device such as a portable telephone or a pager to notify a user of an incoming call by sound or vibration.

[0002]

2. Description of the Related Art In general, such portable devices are configured so that they can be switched between emitting a buzzer sound or a melody sound to notify a user of an incoming call and vibrating without generating a sound. Therefore, a sound-generating body 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. Incorporating both a sounding body and a vibrating body in this way was disadvantageous in terms of miniaturization and cost reduction of equipment, but in recent years,
One sounding body that generates both sound and vibration has come to be used. Some of these types of sounding bodies have multi-functions that can also be used for audio output when talking in a hands-free state.

FIG. 5 shows a vibration generator disclosed in Japanese Unexamined Patent Publication No. Hei 10-257594. A magnetic circuit unit 1 comprises a yoke 2 comprising a short pole center pole 2a and a flange 2b, an annular magnet 3, and a top plate 4. A magnetic gap is formed between the outer periphery of the center pole 2 a and the inner periphery of the top plate 4. The magnetic circuit unit 1 is supported by a first suspension 5 having a curved cross section, and is supported by a support member 6.
To form a mechanical vibration system. Also,
A first disk-shaped diaphragm 7 is joined to the upper end of the support member 6, and a second disk-shaped suspension 9 supporting the voice coil 8 is joined to the lower end of the support member 6. Are located in the magnetic gap of the magnetic circuit section 1. A closed air space 10 is formed between the magnetic circuit section 1, the first suspension 5, and the first diaphragm 7.

When an AC electric signal is input to the voice coil 8 of the vibration generator having this configuration, an electromagnetic force is generated between the voice coil 8 and the magnetic circuit unit 1 and the magnetic circuit unit 1 vibrates. The vibration is transmitted to the device incorporating the vibration generator via the support member 6 to notify the user of the incoming call. In another embodiment shown in the above document, the second suspension 9 which is a flat plate in FIG. 5 is formed as a second diaphragm having a corrugated cross section. In this case, the electric power supplied to the voice coil is provided. If the frequency of the signal is relatively low below the audible frequency band, the magnetic circuit unit 1 vibrates to notify the user of the incoming call as described above, but the frequency of the electric signal is somewhat high and the audible frequency range is low. In this case, the magnetic circuit portion supported by the first suspension 5 hardly vibrates because of its low natural frequency, while the vibration of the second diaphragm to which the voice coil 8 is fixed increases. Generates a buzzer sound. As a result, a multi-functional sounding body can be obtained in which one sounding body performs both sounding and vibration operations in accordance with the frequency of the supplied electric signal.

FIG. 6 shows a multifunctional sounding body disclosed in Japanese Patent Application Laid-Open No. 11-68093. FIG. 6A is a plan view, and FIG. 6B is a sectional view taken along line BB of FIG. The support member 15 has a rectangular outline and accommodates the magnetic circuit section 21 in a circular cavity at the center. The magnetic circuit portion 21 is one in which the yoke 16, the magnet 12, and the top plate 13 are integrated, and an annular weight 19 is attached to the outer periphery of the yoke 16,
The movable portion 22 is constituted by the magnetic circuit portion 21 and the weight 19. The suspension 17 has a support portion 17 a attached to the upper surface of the weight 19 to support the movable portion 22, and a fixed portion 17 c at the tip of the arm portion 17 b is fixed to a receiving portion of the support member 15.

The suspension 18 is a suspension 17
However, at a position rotated by 90 ° with respect to the suspension 17 in a plan view, the support portion has a weight 19.
The movable part 22 is attached to the lower surface of the
The fixing portion 18c at the tip of b is fixed to the receiving portion of the support member 15. A circular diaphragm 11 has an outer periphery attached to the lower surface of the support member 15, and a voice coil 14 fixed to the diaphragm 11 is provided in a magnetic gap between the inner periphery of the central recess of the yoke 16 and the outer periphery of the top plate 13. Has been inserted. The winding terminal of the voice coil 14 is connected to the input terminal 20.

The operation of the multifunctional sound generator shown in FIG. 6 is the same as that described above. When a signal current of an audible frequency flows through the voice coil 14, the diaphragm 11 vibrates under the attraction of the magnetic circuit portion 21. If the frequency of the signal is low and the vibration is in the mechanical vibration region, no sound is output from the diaphragm 11, while the movable portion 22 vibrates to notify the user of the incoming call.

FIG. 7 shows a structure of a movable part of a multifunctional sounding body disclosed in Japanese Patent Application Laid-Open No. 11-69488. The magnetic circuit part 2 has a magnet 12 and a top plate 13 mounted on a yoke 16.
The two suspensions 17 and 18 are fixed on the upper and lower sides of the device 1, and the fixing portions at the tips of the arms of the suspensions 17 and 18 are fixed to the support member as shown in FIG. It constitutes. Two suspensions 1
Numerals 7 and 18 are fixed at positions shifted from each other by 90 ° to stabilize the spring operation.
6a and 16b are provided in pairs, and the suspensions 17 and 1
The small holes No. 8 are positioned in these dowels.

[0009]

In the case of the conventional example shown in FIG.
Since the first suspension 5 having a curved cross section for elastically supporting the magnetic circuit portion 1 is a film-shaped member, it is difficult to make large displacement even if the vibration energy is increased, or the material tends to be fatigued due to increased stress. Or Since the first suspension 5 only supports the upper surface side of the magnetic circuit section 1, if the magnetic circuit section 1 tends to tilt during vibration, this cannot be prevented. As a result, the voice coil 8 The center pole 2a and the top plate 4 may come into contact with each other to generate abnormal noise or damage components.

In the prior art shown in FIG. 6, since the upper and lower sides of a movable portion 22 in which a magnetic circuit portion 21 and a weight 19 are integrated are supported by two suspensions 17 and 18, the movable portion 22 tilts during vibration. And the arms 17b and 18b of the suspension supporting the movable portion have a long length, so that the stress of the suspensions 17 and 18 does not become excessive during vibration. , 1
Since the fixing portions 17c and 18c at the tip of 8b have a certain area, if the two suspensions are mounted with the directions shifted by 90 °, the four corners of the supporting member 15 are fixed to the fixing portions 17c and 17c.
18c, the contour of the support member 15 must be rectangular or square, and cannot be a circle having a small area.

In the conventional example shown in FIG.
Positioning when fixing 18 to the magnetic circuit portion 21 is performed by fitting dowels 16 a and 16 b on the upper and lower surfaces of the yoke 16 with small holes provided in the suspensions 17 and 18. However, for that purpose, the diameter of the dowel and the diameter of the small hole and the distance between the centers of the two dowels and between the two small holes must be manufactured with high accuracy, which increases the processing labor. An object of the present invention is to solve these problems and realize a useful multifunctional sounding body.

[0012]

Means for Solving the Problems Conventionally, in a multifunctional sounding body which has appeared on the market, a magnetic circuit portion has a short columnar magnet inside a yoke of a deep dish-shaped magnetic material with an edge of a short cylinder. In this configuration, a magnetic top plate is joined to the upper surface of the magnet, and since the magnet is located inside the voice coil, it has been limited to what is called an inner magnet type. On the other hand, in the present invention, an external magnet type magnetic circuit is used.

In the magnetic circuit of the outer magnet type, the magnetic path is provided with a pole piece with a flange on a center pole which is a short cylindrical portion, and an annular magnet whose inner diameter is larger than the outer diameter of the voice coil is formed so as to surround the voice coil. It is joined to the flange of the piece, and an annular top plate is joined to the upper surface of the magnet. The magnetic circuit is elastically supported by a support spring and housed in the cover. The support spring has a shape in which the inner peripheral portion and the annular outer peripheral portion are connected by a plurality of arc-shaped arms, and the inner peripheral portion is fixed to the magnetic circuit portion by spot welding or the like, and the outer peripheral portion is bonded or insert molded. To the cover. Since the support spring is circular, the cover can also be made circular.

Further, according to the present invention, two additional support springs having an annular outer periphery as described above are used, and the magnetic circuit portion is supported on both upper and lower sides. As a result, the magnetic circuit section does not swing and does not tilt on both the upper and lower surfaces, thereby preventing the magnetic circuit section from contacting the voice coil during vibration. By arranging the two support springs at a plane position shifted by 90 °, it is possible to suppress the generation of directionality in the spring characteristics.

According to the present invention, when the supporting spring is fixed to the magnetic circuit portion, a low-height circular step is formed on each surface of the pole piece and the top plate, and the round holes in the inner peripheral portion of the supporting spring are formed. The parts are centered by fitting them into the steps. Since there is no need to fit a plurality of dowels and small holes as in the conventional example of FIG. 7, there is no need to accurately manufacture the center distance between the dowels or small holes.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. 1A and 1B show a first embodiment of a multifunctional sounding body according to the present invention, wherein FIG. 1A is a plan view, and FIG. 1B is a sectional view taken along line BB of FIG. 1A. In FIG. 7A, the diaphragm 34 shown in FIG. 7B is removed for clarity. Resin cover A (31) and cover B (3
The magnetic circuit portion 33 is housed in a case where the two are abutted, and the magnetic circuit portion 33 has a short cylindrical center pole 38.
and a pole piece 3 of a magnetic material comprising a flange 38b
An annular magnet 37 is joined to the flange 38b of No. 8 and a top plate 39 of an annular magnetic material is joined to the upper surface of the magnet 37. The inner peripheral portion of the support spring A (36) is fixed to the top plate 39 by spot welding or other means, and the outer peripheral portion of the support spring A (36) is fixed to the cover B (32) by bonding or insert molding. , Magnetic circuit section 3
Numeral 3 is elastically supported by a support spring A (36) to form a vibrating portion.

As shown in FIGS. 1A and 1B, two protrusions 38c are provided outward on the outer periphery of the flange 38b of the pole piece 38. The tip is cover A (3
Since it is close to the inner circumference of 1), it is possible to prevent the magnetic circuit section 33 from being excessively displaced in the lateral direction and damaged when receiving an impact force or the like. The diaphragm 3 is provided on the upper surface of the cover B (32).
4, a voice coil 35 is fixed to the diaphragm 34, and the voice coil 35 is fixed to the center pole 3
8a is located in a magnetic gap formed by the outer periphery of the top plate 39 and the inner periphery of the top plate 39.

The magnetic ring 40 is provided to shield the magnetic circuit portion 33 and prevent the generated magnetic field from leaking outside the case. Cover B has 2
A plurality of connection terminals 41 are provided, and terminals of windings of the voice coil 35 are connected to the terminals by soldering or the like. Reference numeral 36d denotes a ground terminal integrally formed with the support spring A (36), which discharges static electricity carried by the magnetic circuit portion 33 to ground when incorporated in an external circuit, and has a function of preventing electrostatic breakdown of the circuit.

The operation of the multifunctional sounding body of the present invention is the same as that of the conventional example.
When a signal current flows through the magnetic circuit unit 33 and the voice coil 3
5, an alternating electromagnetic force is generated, and if the frequency of the signal is in the audible frequency band, the diaphragm 34 vibrates to generate sound,
If the frequency is lower than that, the vibration of the diaphragm 34 becomes smaller and no sound is generated. Instead, the supporting spring A (3
The magnetic circuit part 33 supported in 6) vibrates mechanically, and the vibration is transmitted to a device incorporating the same via a case to notify a user of an incoming call.

FIG. 2 is a plan view of the support spring A (36). In the support spring A (36), two arc-shaped arms 36b extend from the inner peripheral portion 36a and are connected to an annular outer peripheral portion 36c. As described above, the inner peripheral portion 36a is fixed to the magnetic circuit portion 33, and the outer peripheral portion 36c is fixed to the cover B (32). This allows the contour of the case to be circular as seen in FIG. In the conventional suspension 17 having no annular outer peripheral portion as shown in FIGS. 6 and 7, the case outline becomes square in order to fix the fixing portion 17 c at the tip of the arm portion 17 b to the support member 15. This is disadvantageous in reducing the size of the device because the area is larger than that of a circular case as in the present invention. In FIG. 2, reference numeral 36d denotes a ground terminal, which has nothing to do with the spring function of the support spring (36). However, if this is provided as described above, the magnetic circuit section 33 can be grounded, which is useful.

FIG. 3 is a cross-sectional view of a second embodiment of the multifunctional sounding body according to the present invention, which is the same as the first embodiment shown in FIG. 42). The support spring B (42) fixes the inner peripheral portion to the pole piece 38 by spot welding or the like, and fixes the outer peripheral portion to the cover A (31). In the case of the multifunctional sounding body of FIG.
The magnetic circuit part 33 basically performs a simple vertical vibration,
Due to a slight imbalance in weight, there is a tendency to incline during vibration. Then the center pole 38a
The outer periphery of the upper end and the inner periphery of the top plate 39 may come into contact with the voice coil 35, causing abnormal noise or disconnection of the voice coil 35. In the embodiment of FIG. 3, the lower surface side of the magnetic vibrating part 33 is also supported by the support spring B (42), so that the upper and lower sides of the magnetic vibrating part 33 are prevented from rolling, and the magnetic vibrating part 33 does not tilt. Vibrates up and down.

FIG. 4 is a plan view of the upper and lower two support springs of FIG.
(A) shows a support spring A (36), and FIG. (B) shows a support spring B (42). The support spring B (42) is the same as the support spring A except that it is not necessary to provide the ground terminal 36d.
It has the same shape as (36) and includes an inner peripheral portion 42a, an arm portion 42b, and an outer peripheral portion 42c. However, they are attached to the case so as to be shifted from each other by 90 ° in a plan view as seen in the relationship between FIGS. This is to obtain uniform spring characteristics irrespective of direction and direction.

The use of two support springs as described above
The following advantages are provided in addition to the prevention of the inclination of the magnetic circuit portion. That is, since the spring constant of one supporting spring is half the spring constant required for the vibration system, the arm portions 36b, 42b
Can be elongated to reduce stress. If the resonance frequency of the vibration system is close to the frequency of the drive signal, the vibration becomes excessive and the inclination is apt to occur, and it is preferable that the resonance frequency is separated from the frequency of the signal. It is easier to carry out by sharing the two support springs than to carry out.

FIG. 1A is a plan view of the embodiment of FIG.
In the same manner as described above, two protrusions 38c are provided outward on the outer periphery of the flange 38b of the pole piece 38. Projection 3
8c is to prevent the unnecessary displacement in the lateral direction by making the tip close to the inner wall of the cover as described above. This is because the received air resistance increases and free vibration of the magnetic circuit section 33 is hindered.

As another reason, as shown in FIG. 3, the support spring B (42) is connected to the flange 38 of the pole piece 38.
b and the protrusion 38c, or there is only a very narrow gap. Therefore, if the entire circumference of the flange 38b is close to the inner wall of the cover, the support spring B ( The arm 42b (FIG. 4B) of 42) overlaps the flange 38b and cannot be bent, so that the magnetic circuit section 33 cannot be displaced downward. Therefore, the provision of the protruding portion 38c is based on the arm 4 of the support spring B (42).
2b is limited only to the vicinity of the portion connected to the inner peripheral portion 36a.

Another feature of the present invention is that the support spring A
(36) This is a method of positioning components to fix the support spring B (42) to the magnetic circuit section 33. 3, a circular step 44 is provided on the upper surface of the top plate 39, and a circular step 43 is also provided on the lower surface of the flange 38b of the pole piece 38. The support spring A (36) and the support spring B shown in FIG.
The large-diameter round holes of the inner peripheral portions 36a and 42a of (42) are fitted and positioned, and fixed by spot welding or the like. This eliminates the restriction that the center distance between the dowels and the small holes requires precision, such as the positioning using the dowels and the small holes in the conventional example of FIG. Jigs and the like can be simplified.

[0027]

As described above, according to the present invention, in realizing an external magnet type multifunctional sounding body, the support spring for elastically supporting the magnetic circuit portion has an annular outer peripheral portion, so that the case is also circular. As the product is made smaller and the upper and lower sides of the magnetic circuit are supported using two support springs,
The magnetic circuit portion does not tilt during the vibration, and the contact between the magnetic circuit portion and the voice coil is prevented, so that generation of abnormal noise and damage to components are avoided. In addition, since the centering of the magnetic circuit portion and the support spring is performed by fitting the circular step portion provided on the pole piece and the top plate, which are components of the magnetic circuit portion, and the round hole of the inner peripheral portion of the support spring, Easy and accurate. As described above, according to the present invention, it is possible to provide a small-sized, high-performance, and inexpensive multifunctional sounding body that performs two functions, sound generation and vibration, by using an external magnet type magnetic circuit.

[Brief description of the drawings]

FIG. 1A is a plan view of a multifunctional sounding body according to an embodiment of the present invention, and FIG. 1B is a sectional view taken along line BB of FIG. 1A.

FIG. 2 is a plan view of a support spring A used for the multifunctional sounding body of FIG.

FIG. 3 is a cross-sectional view of another embodiment of the multifunctional sounding body of the present invention.

4A and 4B are plan views of two support springs used in the multifunctional sounding body of FIG. 3, wherein FIG. 4A is a support spring A and FIG.

FIG. 5 is a sectional view of a conventional multifunctional sounding body.

6 (A) is a plan view and FIG. 6 (B) is a cross-sectional view taken along the line BB of FIG. 6 (A).

7A is a plan view and FIG. 7B is a cross-sectional view taken along the line BB of FIG. 7A showing a magnetic circuit portion and a suspension of still another conventional multifunctional sounding body.

[Explanation of symbols]

 1, 21, 33 Magnetic circuit section 2, 16 Yoke 3, 12, 37 Magnet 4, 13, 39 Top plate 7, 11, 34 Vibration plate 8, 14, 35 Voice coil 16a, 16b Dowel 17, 18 Suspension 36 Support spring A 36a, 42a Inner circumference 36b, 42b Arm 36c, 42c Outer circumference 38 Pole piece 38a Center pole 38b Flange 38c Projection 42 Support spring B

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5D012 CA02 CA09 FA10 GA04 HA01 5D017 AA11 AE29 5D021 BB03 BB07 BB08 BB11 BB19 5D107 AA20 BB08 CC08 CC09 CC10 CC11 DD12 FF10

Claims (3)

[Claims] An annular magnet is fixed to a flange of a pole piece having a center pole and a flange with an annular magnet centering on the center pole, and an annular top plate is also fixed to an upper surface of the magnet. Forming a magnetic circuit part of a mold, fixing an inner peripheral part of a support spring A having an annular outer peripheral part and an inner peripheral part and connecting these with a plurality of arc-shaped arms to the magnetic circuit part, The outer peripheral part is fixed to the cover, the magnetic circuit part is elastically supported inside the cover, and the diaphragm to which the voice coil is fixed is attached to the cover,
A multifunctional sounding body characterized in that a voice coil is located in a magnetic gap formed by the outer periphery of the center pole and the inner periphery of the top plate. 2. The multi-function sounding body according to claim 1, further comprising: a support spring B having a shape obtained by rotating the support spring A by 90 ° in a plane, so that an inner peripheral portion of the support spring B is a magnetic circuit unit. And fixed to the magnetic circuit part on the side opposite to the support spring A,
A multifunctional sounding body characterized in that the magnetic circuit portion is elastically supported in the cover on both upper and lower surfaces by fixing the outer peripheral portion of the support spring B to the cover. 3. The multi-function sounding body according to claim 2, wherein a circular step is provided on an upper surface of the top plate, and a round hole in an inner peripheral portion of the support spring A is fixed thereto, and the pole piece is fixed. A structure is provided in which a circular step is provided on the lower surface of the flange, and a round hole in the inner peripheral portion of the support spring B is fixed therein.
A multifunctional sounding body characterized in that a magnetic circuit portion and both support springs are centered.