JP4152043B2 - Multi-functional pronunciation body - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a multi-function sounding body that is incorporated in a mobile communication device such as a mobile phone or a pager and notifies a user of an incoming call by sound or vibration.
[0002]
[Prior art]
In general, portable devices such as those described above are configured to be used by switching between generating a buzzer sound and a melody sound to notify a user of an incoming call, and vibrating without generating a sound. Therefore, in the past, both the sounding body for sound generation similar to a small speaker and the vibrating body that generates vibration by rotating the eccentric weight with a small motor were built in, but this reduced the size and price of the equipment. In recent years, one sounding body that generates both sound and vibration has appeared. Such a sounding body is a multi-functional one that can also be used for voice output during conversation in a hands-free state.
[0003]
FIG. 2 is a sounding body filed by the inventors according to Japanese Patent Application No. 11-139333. FIG. 2A is a top view with some parts removed, and FIG. 2B is a BB of FIG. It is sectional drawing. In FIG. (B), a diaphragm 23 having a disc-like shape and a curved cross section is formed of polyimide, polyester or the like on the shoulder 33 on the upper surface side of the case where the cover A (21) and the cover B (22) are joined. The coil 24 is fixed to the lower surface of the diaphragm 23. There is a support plate 25 made of a metal such as stainless steel at substantially the same height as the coil 24, which has four arms as shown in FIG. In FIG. 1A, the inside of the diaphragm 23 shown in FIG.
[0004]
The support plate 25 is fixed by embedding the outer ends of the four arms in the cover B (22). A yoke 27 of a magnetic material such as pure iron or permalloy is fixed to the lower surface of the support plate 25 by spot welding or the like. The yoke 27 has a deep dish shape, a magnet 26 is fixed to the concave portion, and a magnet is fixed to the upper surface of the magnet 26. A top plate 28 of material is provided. The coil 24 is located in an annular magnetic gap formed by the outer periphery of the top plate 28 and the inner periphery of the yoke 27. The reason why the cylindrical portion on the outer periphery of the yoke 27 is thick is to increase the mass of the vibrating portion to obtain sufficiently large vibration energy. A flange 31 is formed on the outer periphery of the yoke, and the flange 31 enters the recess 34 between the shoulders 32 and 33 of the case.
[0005]
A circular lateral shake prevention film 29 is provided on the lower surface side of the sounding body. This is a porous film made of a plastic cloth or the like with a mesh cloth or many small holes, and has an air permeability. A (21) is bonded to the inner shoulder portion 32, and the central convex portion 30 of the yoke 27 is bonded to the central portion with an adhesive or a double-sided tape. As a result, the lateral vibration of the lower surface of the yoke 27 is prevented, and the yoke 27 and the object mounted thereon are prevented from being inclined and coming into contact with the coil 24.
[0006]
A connection terminal 35 having a spring property such as a stainless material is partially embedded in the cover B (22), and a terminal 37 of the coil winding is soldered to a soldering portion 38 of the connection terminal 35. An end portion of the connection terminal 35 is provided with a contact portion 36 raised so as to make point contact with the circuit pattern. In order to improve the solder wettability of the soldering portion 38 and reduce the contact resistance of the contact portion 36, the connection terminal 35 is subjected to gold plating or the like.
[0007]
The support plate 25, the yoke 27, the magnet 26, and the top plate 28 fixed to the support plate 25 form a magnetic circuit and constitute a vibrating part. When an electric signal having a certain frequency is supplied to the coil 24, an electromagnetic force acts between the coil 24 and the above magnetic circuit to start vibrations. At this time, if the frequency of the signal is high to some extent and is in an audible frequency range, the vibration of the diaphragm 23 to which the coil 24 is fixed becomes large, and a buzzer sound, a melody sound or a sound is generated according to the type of the signal. The vibration part supported by the support plate 25 hardly vibrates because of its lower natural frequency. On the other hand, when a signal having a relatively low frequency below the audible frequency band is applied, no sound is emitted from the diaphragm 23. Instead, the vibration of the support plate 5 to which the magnet 6 and the yoke 7 are fixed increases. (21) and the cover B (22) are transmitted to the portable device incorporating the sounding body to notify the user of the incoming call. In this way, one sounding body performs two kinds of operations, sounding and vibration.
[0008]
As shown in FIG. 2B, the flange 31 on the outer periphery of the yoke 21 enters the recess 34 on the inner periphery of the case, so that when the user mistakenly removes the sound generator or the device incorporating the sound generator, etc. Even if the vibration part is about to be displaced greatly by an impact, the collar part 31 comes into contact with the upper and lower shoulder parts 32 and 33 of the concave part 32 and stops, so that deformation and breakage of the support plate 25 and other parts are prevented.
[0009]
In addition, the vibration part composed of the support plate 25, the yoke 27, and other parts is the cover A (21).
, The cover B (22), the diaphragm 23, and the lateral vibration-preventing film 29 are housed in a space. If the degree of sealing of the space is high, the movement of the diaphragm 23 and the yoke 27 having the flange portion 31 A large fluid resistance is generated with respect to movement, and a desired sound pressure and vibration force cannot be obtained. Therefore, a mesh cloth or a porous film is used for the lateral vibration prevention film 29 to improve the ventilation between the inside and outside, and although not shown in the drawings, the collar part 31 and the shoulder part 32 are not a continuous shape, but a notch or a hole is provided. There are many places to improve air circulation.
[0010]
The multi-functional sounding body can be manufactured very efficiently by making the cover A (21), the cover B (22), etc. plastic. The detailed manufacturing method is left to the above-mentioned application, but a shape in which the support plate 25 is supported by the connecting portion in the windows arranged in the longitudinal direction of the strip by using a metal strip and progressive press working. The plastic cover B (22) in which the outer periphery of the support plate 25 is inserted is formed in each window, and then this portion is removed from the window. A part in which the support plate 25 and the plastic cover B (22) are integrated is obtained.
[0011]
[Problems to be solved by the invention]
In such a multi-function sounding body, the vibrating part held in the case, that is, the support plate 25, the yoke 27, the magnet 26, the top plate 28, etc. integrated therewith, may be charged with static electricity. It is a problem. Previously, the case part was made of metal and the vibration part was electrically connected to it, and when incorporating it into equipment, the case was connected to the grounding wire of the circuit board to prevent the vibration part from being charged. As is common in FIG. 2, if the covers A (21) and B (22), which are case parts, are made of plastic as an insulating material, the vibration part floats from the ground, and the other parts of the circuit In some cases, circuit components such as ICs may be damaged by electrical discharge.
The present invention realizes a multi-function sounding body with a simple structure and circuit protection by taking measures against static electricity.
[0012]
[Means for Solving the Problems]
In order to solve the above-described problem, in the present invention, a ground terminal is formed integrally with a support plate that elastically supports the vibrating portion, and this is protruded from the case in the same manner as the connection terminal. The support plate and the yoke are joined by a conductive method such as spot welding or adhesion with a conductive adhesive. When the multi-function sounding body configured in this way is attached to the circuit board of the equipment, the grounding terminal is connected to the grounding wire, so that the vibrating part is always charged with the ground potential, preventing electrostatic breakdown of the circuit components. Can be removed.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an embodiment of a multifunctional sounding body according to the present invention. FIG. 1 (A) is a top view with some components removed, and FIG. 1 (B) is a sectional view taken along line BB in FIG. Since the basic structure is the same as that shown in FIG. 2, the same reference numerals as those in FIG. The cover 51 is made of plastic, and a support plate 25 that is an elastic suspension of the vibration part is insert-molded. The outer periphery of the diaphragm 23 is bonded to the upper surface of the shoulder portion 33, and the coil 24 is fixed to the lower surface of the diaphragm 23. Note that the plan view of FIG. 1A is drawn without the diaphragm 23.
[0014]
As shown in FIG. 1A, the support plate 25 has four arms, the inner and outer ends of the arms are connected to the inner and outer ring portions, and the outer ring portion is embedded in the cover 51. . A yoke 27 is joined by spot welding 53 to the lower surface of the inner ring portion. As shown in FIG. 1B, the magnet 26 is fixed to the concave portion of the deep-plate-shaped yoke 27, and the top plate 28 is provided on the magnet 26. The top plate 28 and the yoke 27 are formed on the outer periphery. A coil 24 is located in the annular gap.
[0015]
A connection terminal 35 is inserted in the cover 51, and a coil winding terminal 37 is soldered to a soldering portion 38 of the connection terminal 35. An end portion of the connection terminal 35 is provided with a raised contact portion 36 for making point contact with the circuit pattern. With the above configuration, this multi-function sounding body performs sounding or vibration operation in accordance with the drive signal as in the case of FIG.
[0016]
The structural feature of the embodiment of FIG. 1 is that a ground terminal 52 is newly inserted into the cover 51. As shown in FIGS. 1 (A) and 1 (B), the ground terminal 52 is made integrally with the support plate 25, is a metal such as stainless steel, and has a spring property. The contact portion 53 is raised so as to come into contact. Therefore, by providing a ground pattern on the circuit board of the device on which the multi-function sound generator is mounted, when the multi-function sound generator is mounted on the circuit board, the contact portion 53 of the ground terminal 52 contacts the ground pattern. The support plate 25 integrated with the ground terminal 52, and the yoke 27 and other components electrically integrated therewith are grounded, and these components are not charged. This prevents damage to circuit components due to static electricity.
[0017]
In some cases, the ground terminal 52 may not be elastically contacted with the circuit pattern as described above, but may be firmly connected by soldering. In such a case, the ground terminal 52 need only protrude straight from the cover 51 without being formed into a spring shape as shown in FIG. It is also possible to provide such a ground terminal and solder it to the circuit pattern. The same applies to the connection terminal 35.
[0018]
Although the ground terminal 52 is newly provided in the multi-function type sounding body, since it is formed integrally with the support plate 25 as described above, the number of components does not increase. As in the case of the conventional example of FIG. 2, the manufacture of the support plate by progressive pressing of the strip material and the manufacture of the cover by insert molding of the strip material can be applied to the embodiment of the present invention. There is no increase in costs or manufacturing costs. It should be noted that the structure provided with the shoulder 32 of the cover A (21) in FIG. 2, the lateral vibration preventing film 29, etc. can be used together with the present invention.
[0019]
【The invention's effect】
As is apparent from the above description, according to the present invention, when the multifunctional sounding body is mounted on the circuit board of the built-in device by providing the grounding terminal integrated with the support plate in the multifunctional sounding body, The vibration part composed of the support plate and the yoke can be grounded so as not to be charged with static electricity, and electrostatic breakdown of the circuit components can be prevented. If the ground terminal is provided with a spring property, the multifunctional sound generator is elastically contacted with the circuit pattern simply by attaching it to the circuit board, so that the number of assembly steps can be reduced.
[0020]
Since the grounding terminal is integrated with the support plate, there is no need to electrically connect the vibrating part and the metal cover as in the conventional structure for grounding the metal cover of the multi-function sound generator. Manufacture can be included in the manufacturing process of the support plate by progressive press working, and there is no increase in the number of parts or manufacturing man-hours. As described above, according to the present invention, a multifunctional sounding body having a simple structure, high performance, and high reliability that can perform two functions of sound generation and vibration can be provided at low cost.
[Brief description of the drawings]
1A is a top view and FIG. 1B is a BB cross-sectional view of FIG.
2A is a top view and FIG. 2B is a BB cross-sectional view of FIG.
[Explanation of symbols]
21 Cover A
22 Cover B
23 Diaphragm 24 Coil 25 Support plate 26 Magnet 27 Yoke 28 Top plate 29 Lateral shake prevention film 31 Gutter 32, 33 Shoulder 34 Recess 35 Connection terminal 51 Cover 52 Ground terminal 53 Spot welding

Claims (1)

In the multi-function type sounding body in which the diaphragm having the coil fixed and the vibration part having the yoke mounted with the magnet etc. fixed to the support plate are accommodated in the cover,
The support plate and the yoke are conductively joined by spot welding or the like, and a ground terminal is formed on a part of the support plate so that the ground terminal can be grounded when attached to a circuit board or the like. Functional sound generator.

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