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JP2008199600

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2008199600
A micro speaker including a housing, a ring, a vibrating film, a coil, a magnet, a magnetic
conductor, and a circuit board. The housing is in the form of a microspeaker. The ring is disposed
within the housing. The vibrating film is supported by the ring. The coil is placed on a vibrating
film. A magnet is placed on the ring. The magnetic conductor is disposed on the magnet. The
circuit board is disposed on the magnetic conductor. The housing has an inner turn at the edge of
the housing near the circuit board or ring, which is used to press the circuit board or ring. In the
present invention, the amount of adhesive used during assembly of the components is minimized
and the output quality of the loudspeaker is improved. [Selected figure] Figure 3
MICRO SPEAKER AND METHOD FOR ASSEMBLING MICRO SPEAKER
[0001]
The present invention relates generally to a microspeaker and a method of assembling the
microspeaker that can improve the output frequency characteristics and the sound quality
characteristics of the microspeaker when the volume is minimized.
[0002]
Microspeakers are suitable for notebook computers, cameras, game consoles, desktop computers,
but in particular for mobile communication products.
Notebook computers typically use speakers in a square configuration with 10 mW input and 800
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W maximum input. The size of speakers suitable for mobile communication products is becoming
smaller and smaller. In recent years, much research and development in this area has been
conducted to meet this requirement.
[0003]
FIG. 1 is a cross-sectional view of a prior art micro speaker. FIG. 2 illustrates the problem of the
prior art microspeaker. Referring to FIG. 1, the shape of the conventional speaker 100 includes a
front cover 160 and a housing 110, and a magnet 120 is disposed in the housing 110.
[0004]
In detail, the lower part of the housing 110 protrudes, and the magnet 120 is disposed in this
protruding part. The flat panel 130 is disposed on the magnet 120. The printed circuit board 140
is disposed on the opposite side of the magnet 120, that is, on the outside of the housing 110.
The coil 180 is disposed within the housing 110 and forms a magnetic field with the magnet
120. A vibrating film 170 that receives the electrical signal and vibrates the air is also disposed
within the speaker 100. Further, a fixing ring 150 for fixing the vibrating film 170 is disposed in
the housing 110.
[0005]
Additionally, vents 111 and 161 are disposed in the housing 110 and the front cover 160 to
provide air circulation between the inside and the outside of the speaker. Refer to FIG. 2 in
describing the problem of the conventional loudspeaker 100. FIG. 2 shows the formation of the
speaker 100.
[0006]
First, the first fixing adhesive 190 is used to fix the printed circuit board 140 to the outside of
the housing 110 in order to fix the printed circuit board 140 outside the housing 110.
[0007]
The magnet 120 is then secured to the inside of the housing 110 using a second adhesive 191.
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[0008]
Third, the fixing ring 150 is fixed to the housing 110 using a third adhesive 192, and the front
cover 160 and the housing 110 are assembled using a fourth adhesive 193.
[0009]
Fourth, the fifth adhesive 194 is used to assemble the vibrating film 170 and the coil 180, and
the sixth adhesive 195 is used to assemble the flat panel 130 and the magnet 120.
[0010]
It can be seen that most of the components of the conventional loudspeaker 100 are assembled
by adhesive.
In particular, the assembly of the vibrating film 170 and the fixing ring 150 and the assembly of
the other members and the housing 110 are all realized by an adhesive.
Since the adhesive may shrink during the drying process, the spacing between the vibrating film
170 and the coil 180 can not be made uniform, and the spacing between the vibrating film 170
and the housing 110 is made uniform. I can not do it.
Thus, such non-uniformity affects the sound quality characteristics.
The reason is as follows. Although the spacing between components should be kept small, the
viscosity of the adhesive and the non-uniformity of the coating of the adhesive can affect the
components. Therefore, the inability to achieve good output frequency characteristics and sound
quality of the speaker is a significant weakness.
[0011]
Therefore, an object of the present invention is to provide a method of assembling a
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microspeaker having a desirable output sound quality by simplifying a method of assembling a
microspeaker. Another object of the present invention is to provide a microspeaker having a
desirable output quality and a method of assembling the microspeaker by reducing the adhesive
necessary for assembling the microspeaker as much as possible.
[0012]
The microspeaker of the present invention includes a housing, a washer, a ring, a vibrating film, a
coil, a magnet, a magnetic conductor, and a circuit board. The housing is in the form of a
microspeaker. The washer is housed in the housing. The ring is contained within the housing and
disposed on the washer. The vibrating film is supported by the ring. The coil is placed on a
vibrating film. A magnet is placed on the ring. The magnetic conductor is disposed on the
magnet. The circuit board is disposed on the magnetic conductor. The guide rib is disposed on
the inner wall of the housing, and the guide notch corresponding to the guide rib is disposed on
the magnet, the magnetic conductor, and the side edge of the circuit board, respectively. Thereby,
the assembly direction of a magnet, a magnetic conductor, and a circuit board is guided.
[0013]
The method of assembling the microspeaker according to the present invention comprises the
steps of: disposing a washer in a housing; disposing the ring, the vibrating film, and the coil on
the washer, the ring being disposed on the washer Between the step of: disposing the coil on the
vibrating film; disposing the magnet on the ring; disposing the magnetic conductor on the
magnet; disposing the circuit board on the magnetic conductor And pressing the circuit board by
rounding the edge of the housing near the circuit board inward to form an inner turn.
[0014]
The drawings are attached in order to make the present invention more understandable.
The accompanying drawings are incorporated in and constitute a part of this specification. The
drawings illustrate embodiments of the invention and, together with the description, serve to
explain the principles of the invention.
[0015]
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Hereinafter, embodiments of the present invention will be described in detail based on the
attached drawings. Wherever possible, the same reference numbers are used in the drawings and
the description for the same or similar parts.
[0016]
FIG. 3 is a cross-sectional view of a portion of the means of the microspeaker described in the
present invention. FIG. 4 is an exploded view of the micro speaker assembly method of the
present invention.
[0017]
Referring to FIGS. 3 and 4, the microspeaker 200 of the present embodiment is disposed on a
housing 210 having a shape, a washer 270 disposed in the housing 210, a ring 262 disposed on
the washer 270, and a ring 262. It can be seen that the magnet 240, the magnetic conductor 230
disposed on the magnet 240, and the circuit board 220 disposed on the magnetic conductor 230
are included. Nonwoven fabric or long fiber paper may be added between the magnetic
conductor 230 and the circuit board 220. Ring 262 may be comprised of copper or other
suitable material. Magnetic conductor 230 may be comprised of iron or other suitable material.
The circuit board 220 may be a printed circuit board (PCB) or another type of circuit board.
[0018]
In particular, on the upper side of the housing 210 an opening is formed, from which
components can be arranged. The housing 210 can receive a washer 270, a ring 262, a magnet
240, and a circuit board 220. Housing 210 may be comprised of an aluminum alloy or other
suitable material. After housing the components in the housing 210, the edge (i.e., the opening)
of the housing 210 near the circuit board 220 is rounded inward to form the inner winding
portion 213. The circuit board 220 is pressed by the force of the inner winding portion 213.
Furthermore, the force from the inner winding 213 is also used to secure the washer 270, the
ring 262, the magnet 240 and the circuit board 220 in the housing.
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[0019]
Furthermore, in the micro speaker 200 of the present embodiment, in order to fix the magnet
240, the magnetic conductor 230, and the circuit board 220 in the correct position, as shown in
FIG. 5, the guide rib 211 is formed on the inner wall of the housing 210. It is done. The guide rib
211 may be a protruding anti-cylindrical guide column or other structure. Guide notches 242 are
formed at side edges of the magnet 240 to correspond to the guide ribs 211, guide notches 234
are formed at side edges of the magnetic conductor 230, and guide notches 224 are formed at
side edges of the circuit board 220. Therefore, the magnet 240, the magnetic conductor 230 and
the circuit board 220 can be properly assembled in the housing 210 along the guide rib 211. The
details of this technical content can be understood from FIGS.
[0020]
In order to maintain a constant distance between the ring 262 and the bottom of the housing
210, the round washer 270 is placed before placing the ring 262. Therefore, a constant distance
is also maintained between the vibrating film 264 and the inner bottom surface of the housing
210. By this method, a resonant space is formed under the vibrating film 264 so that the
vibrating film 264 can cause air vibration.
[0021]
In order to form a magnetic field with the magnet 240, a coil 261 is mounted on the vibrating
film 264, and a wire 263 is connected thereto. In essence, wire 263 is the two end portions of
coil 261 and is used to provide electrical conduction. However, the electric wire 263 can be
connected to the coil 261 by a bonding process. In this case, the wire 263 is likewise regarded as
the two end portions of the coil 261. Wires 263 need to be connected to circuit board 220 to
achieve electrical conduction. The paths through which the electric wires 263 can pass are
disposed at the side edges of the magnet 240, the magnetic conductor 230, and the circuit board
220, respectively. Such a path is formed by a line notch 241 at the side edge of the magnet 240,
a line notch 233 at the side edge of the magnetic conductor 230, and a line notch 221 at the side
edge of the circuit board 220. Further, such a path has a function of fixing the electric wire 263.
Therefore, the wires can be electrically connected to the circuit board 220 firmly.
[0022]
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The magnet 240 vibrates by receiving a magnetic field formed by the current of the coil 261, and
the coil 261 and the vibrating film 264 are pushed by an interaction force generated according
to Fleming's left-hand rule to generate a sound. The magnetic conductor 230 on the magnet 240
has a function of suppressing the magnetic field leakage to increase the magnetic field strength.
The magnetic conductor 230 is formed by an upper portion 231 supporting the circuit board
220 and a lower portion 232 capable of covering the coil 261. A housing space capable of
housing the coil 261 exists in the lower portion 232.
[0023]
In particular, the line notch 233 is disposed on the side of the upper portion 231 to allow the
electric wire 263 to pass through, and a plurality of vents 235 are disposed on the top surface to
maintain the air flow. A plurality of positioning bumps 236 are disposed on the upper surface of
the upper portion 231 to fix the circuit board 220. Furthermore, since the circuit board 220 also
has a plurality of air vents 222 corresponding to the air vents 235 of the magnetic conductor
230, the outside air and the air in the housing 210 are the air vents 222 of the circuit board 220
and the air vents 235 of the magnetic conductor 230. And can be circulated.
[0024]
In order to couple with the positioning bumps 236 of the magnetic conductor 230, the circuit
board 220 further comprises a plurality of corresponding positioning holes 223. FIG. 4 shows
that the circuit board 220 has a plurality of positioning holes 223 penetrating the circuit board
220. However, only a few concave points may be formed on the lower surface of the circuit
board 220. However, since the recessed points do not penetrate through the circuit board 220 so
as to couple with the positioning bumps 236, the magnetic conductor 230 and the circuit board
220 can be assembled.
[0025]
In order to assemble the circuit board 220 along the guide rib 211 on the inner wall of the
housing 210, the guide notch 224 is formed on one side of the circuit board 220 and the line
notch 221 protecting the wire 263 is formed on the other side. Ru. Furthermore, the circuit
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board 220 has a vent 222 formed to secure an air flow, and a positioning hole 223 formed to
couple with the magnetic conductor 230. The exposed wires 263 passing through the line
notches 221, 233, 241 are welded to the surface circuit of the circuit board 220. The connection
between the electric wire 263 and the circuit board 220 is determined by the setting method of
the electronic loop of the circuit board 220. The function of the circuit board 220 is conventional
and will not be described here.
[0026]
Here, the washer 270, the vibrating film 264, the coil 261, the magnet 240, the magnetic
conductor 230, and the circuit board 220 are assembled in the housing 210. After welding the
electric wire 263 formed by the end of the coil 261 and the circuit board 220, the edge portion
of the housing 210 near the circuit board 220 is rounded inward to form the inner winding
portion 213. The inner winding portion 213 is used to press the circuit board 220 firmly.
Thereby, the micro speaker 200 of the present embodiment can be assembled without using an
adhesive. In FIG. 5, the position of the inner winding portion 213 is simply displayed, and the
inner winding portion 213 is not shown in an actual state.
[0027]
In order to facilitate the pressure welding process of the housing 210, a notch 212 is formed at
the edge of the housing 210 near the circuit board 220. The length of the guide rib 211 on the
inside of the housing 210 can be determined by the size of the magnet 240, the magnetic
conductor 230, and the circuit board 220 in order to reduce the manufacturing cost.
[0028]
FIG. 6 is a simplified view showing the appearance of the microspeaker of the present invention.
From FIG. 6, the housing 210 and the top surface of the circuit board 220 can be seen. However,
the position of the inner winding portion 213 is simply displayed, and the inner winding portion
213 is not shown in an actual state.
[0029]
The electric wire 263 connected to the coil 261 in the housing 210 passes through the line notch
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221 of the circuit board 220 and is then welded to the circuit board 220.
[0030]
FIG. 6 shows the state before pressure welding, and the state in which the micro speaker 200 is
completely assembled should be as shown in FIG.
From the detailed illustration, it can be seen that according to the invention, the assembly of the
components of the microspeaker can be easily performed and the quality is improved since the
assembly is performed without using an adhesive.
[0031]
7 and 8 are cross-sectional views showing two other types of microspeakers of the present
invention. Referring to FIG. 7, the microspeaker 700 of the present embodiment is similar to the
microspeaker 200 of FIG. 3. The differences between the two will be described below. The
bottom of the housing 710 has an opening, but the bottom of the housing 710 is slightly bent in
an L-shape to support other components. The order of placing each component in the housing
710 is the reverse of the order of the micro-speakers 200 of FIG. That is, the circuit board 220 is
disposed on the bottom of the housing 710, and the washer 270 is disposed on the top.
Furthermore, after housing each component in the housing 710, the edge of the housing 710
near the washer 270 is rounded inward to form the inner winding portion 713. Thus, the washer
270 is pressed by the force of the inner winding portion 713. In addition, the force by the inner
winding portion 713 fixes the washer 270, the ring 262, the magnet 240, and the circuit board
220 in the housing 710. Further, a cover plate 720 is disposed between the washer 270 and the
inner winding portion 713.
[0032]
Next, referring to FIG. 8, it can be seen that the difference between the micro speaker 800 of the
present embodiment and the micro speaker 700 of FIG. 7 is as follows. That is, the washer 270
and the cover plate 720 are omitted, and the inner winding portion 713 of the housing 710
presses the ring 262.
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[0033]
In the microspeaker assembly method of the present invention, microspeakers having uniform
and stable quality can be manufactured using a simple operation method. Furthermore, since the
amount of adhesive used can be reduced, the improvement of the stability of the output quality
of the microspeaker can be maintained.
[0034]
It will be apparent to those skilled in the art that various modifications can be made to the
structure of the present invention without departing from the scope and spirit of the present
invention. Thus, the present invention is intended to cover the modifications of this invention
provided that they fall within the scope of the following claims and their equivalents.
[0035]
Sectional drawing which shows the micro speaker of prior art. FIG. 2 illustrates the problem of
the prior art micro speaker. Sectional drawing which shows the part of the means of the micro
speaker demonstrated by this invention. The exploded view which shows the assembling method
of the micro speaker of this invention. Simplified view of the housing. The simplification figure
which shows the appearance of the micro speaker of the present invention. Sectional drawing
which shows one other type of microspeaker of this invention. Sectional drawing which shows
one other type of microspeaker of this invention.
Explanation of sign
[0036]
100: Conventional speaker 110, 210, 710: Housing 111, 161, 222, 235: Air vent, 120, 240:
Magnet 130: Flat panel 140 Printed circuit board, 150: Fixing ring, 160: Front cover, 170, 264,
Vibration film, 180, 261: Coil, 190, 191, 192, 193, 194, 195: Bonding , 200, 700, 800 ... micro
speaker, 211 ... guide rib, 212 ... notch portion, 213, 713 ... inner winding portion, 220 ... circuit
board, 221, 233, 241 · · · · Line notch, 223 · · · Positioning hole, 224, 234, 242 · · · Guide notch,
230 · · · Magnetic conductor, 231 · · · Parts, 232 ... bottom, 236 ... positioning bump 262 ... ring,
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263 ... wire, 270 ... washer, 720 ... cover plate.
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