JP2009253795A - Method for assembling loudspeaker and electronics using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for assembling a thin loudspeaker in which rolling phenomenon is prevented and a gap defect is reduced. <P>SOLUTION: After a second plate-like magnet 7 is assembled to a lower case 6, a magnetic fluid 14 is made to adhere to an entire side portion of the second plate-like magnet 7 and by combining a diaphragm 9 to which a voice coil 10 is assembled, an upper case 15 to which a first plate-like magnet 12 is assembled and the lower case 6, the magnetic fluid 14 is interposed only between a longitudinal side portion of the second plate-like magnet 7 and the voice coil 10 by a magnetic force of the first plate-like magnet 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for assembling a thin type speaker and an electronic apparatus using the same.

  Since electronic devices such as portable devices are required to be thin, a speaker built in the main body is also required to be thin.

In order to reduce the thickness of the speaker, it is natural to reduce the size of the magnet for forming the magnetic circuit. However, if the magnet is made smaller, the magnetic force becomes smaller, resulting in sound output. Since it becomes small, the magnet cannot actually be made very small (for example, such a prior art is described in Patent Document 1 below).
JP 2005-51283 A

  As described above, the type of speaker built into an electronic device such as a portable device has been conventionally reduced in thickness, but in order to avoid a decrease in audio output, the magnet cannot actually be made too small. However, as a result, there has been a problem that the thickness has not been sufficiently satisfied.

  SUMMARY OF THE INVENTION Accordingly, the present invention has an object to reduce the gap due to the reduction in thickness and the increase in sound output, the prevention of rolling phenomenon.

  In order to achieve this object, the present invention provides a rectangular first and second plate magnets arranged in a horizontal direction or a substantially horizontal direction via a magnetic gap, and a voice movably arranged in the magnetic gap. A coil and a diaphragm coupled to the voice coil, wherein the first plate magnet forms a magnetic pole at the plate end, and the second plate magnet has a magnetic pole at both ends in the thickness direction. In the voice coil portion in the magnetic gap, the magnetic flux is configured to be substantially orthogonal to the voice coil portion, and between the voice coil and the side surface in the longitudinal direction of the second plate magnet. A speaker assembly method in which a magnetic fluid is interposed between the second plate magnet and the lower case, and then the magnetic fluid is attached to the entire side surface of the second plate magnet. After, the voice By combining the lower case with the diaphragm assembled with the first plate magnet and the upper case assembled with the first plate magnet, the magnetic force of the first plate magnet A magnetic fluid is interposed only between the side surface portion in the longitudinal direction and the voice coil.

  As described above, the present invention includes the first and second plate magnets arranged in the horizontal direction or the substantially horizontal direction through the magnetic gap, the voice coil movably arranged in the magnetic gap, and the voice coil. The first plate magnet has a magnetic pole formed at its plate end, and the second plate magnet has a magnetic pole formed at both ends in the thickness direction, and the magnetic gap The voice coil portion of the speaker is configured so that the magnetic flux is substantially perpendicular to the voice coil portion, and is arranged in the horizontal direction or the substantially horizontal direction of the magnetic gap via the magnetic gap. Moreover, since the first and second plate magnets are arranged on both sides of the magnetic gap, the magnetic output can be increased and the sound output can be increased.

  In addition, by interposing a magnetic fluid between the longitudinal side surface of the second plate magnet and the voice coil, a rolling phenomenon can be prevented and gap defects can be reduced, and a heat radiation effect from the voice coil can be reduced. This improves the input resistance of the speaker.

  In addition, after assembling the second plate-shaped magnet to the lower case, a magnetic fluid is attached to the entire side surface of the second plate-shaped magnet, and then the diaphragm assembled with the voice coil; By combining the upper case assembled with the first plate magnet with the lower case assembled with the second plate magnet, the second plate shape is generated by the magnetic force of the first plate magnet. The ferrofluid on the side surface in the short direction of the magnet is attracted in the direction of the side surface in the longitudinal direction of the second plate magnet, and between the side surface in the longitudinal direction of the second plate magnet and the voice coil. The magnetic fluid can be interposed only in the first layer.

  Thereby, the flow of the air in the portion surrounded by the second plate magnet, the diaphragm and the magnetic fluid is not prevented, and the vibration of the diaphragm is not limited.

  Hereinafter, an embodiment of the present invention will be described using a cellular phone as an example of an electronic device with reference to the accompanying drawings.

  In FIG. 1, reference numeral 1 denotes a main body, and a lid 2 is coupled to the main body 1 so as to be freely opened and closed. When viewed from the back side in FIG. 1, the main body 1 is provided with operation buttons (not shown), and the lid 2 is provided with a liquid crystal display (not shown), as in a general mobile phone. It has been.

  Further, two covers 3 are provided on the outer surface side of the main body 1 as shown in FIG. 1, and the speaker 4 shown in FIGS. 2 and 3 is mounted in the main body 1 on the back side of these covers 3. .

  The speaker 4 is configured as shown in FIG. The upper case 15 includes an upper plate 5 made of stainless steel 301 which is a nonmagnetic material and a resin frame 13. A second plate magnet 7 made of neodymium in order from the lower plate 6 side to the upper plate 5 between the lower case (hereinafter referred to as the lower plate) 6 formed of a cold rolled steel plate that is a magnetic body. A ring 8 formed of a cold rolled steel plate as a magnetic material, a diaphragm 9 formed of a PEI resin film, a voice coil 10 formed of a copper wire, and a cold rolled steel plate as a magnetic material. A ring 11 and two first plate magnets 12 made of neodymium are sequentially arranged. A magnetic fluid is interposed only between the side surface portion in the longitudinal direction of the second plate magnet 7 and the voice coil 10.

  As shown in FIGS. 3, 5, and 6, the lower plate 6 has an oval shape, and a rectangular second plate-like shape is formed on the upper surface of the rectangular fixing portion 6A in the longitudinal central axis portion. The lower surface of the magnet 7 is fixed by an adhesive (not shown), and rectangular openings 6B are formed on both sides of the fixed portion 6A.

  Further, the ring 8 is fixed to the outer peripheral portion of the lower plate 6 so as to allow the magnetic flux to pass therethrough.

  Further, the outer periphery of the diaphragm 9 is placed on the ring 8, and the ring 11 is placed on the outer periphery of the diaphragm 9.

  Further, the upper surface of the two first plate magnets 12 is fixed to the lower surface portion of the upper plate 5 facing the opening 6B of the lower plate 6 with an adhesive (not shown) above the diaphragm 9. Has been. The outer peripheral surfaces of the two first plate magnets 12 are adhesives (not shown) for bonding the upper surfaces of the two first plate magnets 12 to the lower surface portion of the upper plate 5. Are partly fixed to the frame 13 portion by entering between the respective outer peripheral surfaces of the first plate magnet 12 and the inner peripheral surface of the frame 13.

  Further, a rectangular voice coil 10 is fixed to a portion of the upper surface of the diaphragm 9 corresponding to the outer periphery of the second plate magnet 7 as shown in FIG.

  A magnetic fluid is interposed only between the side surface portion in the longitudinal direction of the second plate magnet 7 and the voice coil 10.

  The speaker 4 is assembled by first attaching the second plate magnet 7 to the lower case 6 and then attaching the magnetic fluid 14 to the entire side surface of the second plate magnet 7 as shown in FIG. Let Then, the upper case 15 in which the first plate magnet 12 is assembled and the diaphragm 9 in which the voice coil 10 is assembled are placed on the assembly table. Thereafter, the prepared lower case 6 assembled with the second plate magnet 7 is dropped onto the assembly table from above and assembled. As a result, the assembly workability and reliability can be improved, and the side surface portion of the second plate magnet 7 in the short direction is generated by the magnetic force of the first plate magnet 12 as shown in FIG. The magnetic fluid 14 is attracted in the direction of the side surface in the longitudinal direction of the second plate magnet 7, and the magnetic fluid 14 is applied only between the side surface in the longitudinal direction of the second plate magnet 7 and the voice coil 10. It can be made to intervene.

  In the state configured as described above, the two first plate magnets 12 made of neodymium are magnetized such that the inner end in the longitudinal direction is an N pole and the outer end is an S pole as shown in FIG. ing.

  Further, as shown in FIG. 7, the neodymium second plate-like magnet 7 is magnetized such that the surface side in the thickness direction is an S pole and the lower surface side in the thickness direction is an N pole.

  As a result, as shown in FIG. 4 and FIG. 7, the magnetic flux emitted from the N pole inside each of the two first plate magnets 12 made of neodymium (in FIG. 4, in order to avoid the complicated feeling of the drawing, (Only the magnetic flux emitted from the first plate-like magnet 12 is shown) travels substantially horizontally inwardly, traverses the voice coil 10 in a substantially orthogonal state, and then the upper surface of the second plate-like magnet 7. (It is described that the first plate magnet 12 and the second plate magnet 7 are arranged in a horizontal or substantially horizontal state. As shown in FIG. 6, the thickness direction of the first plate magnet 12 and the second plate magnet 7 is partially overlapped in the horizontal direction, and the both are not partially overlapped in the thickness direction in the horizontal direction. In other words, the magnetic flux travels so as to be substantially orthogonal to the voice coil 10. Doo is important, in the horizontal state in that respect in which slight width is set.).

  After that, the magnetic flux emitted from the N pole on the lower surface of the second plate-shaped magnet 7 travels through the rectangular fixed portion 6A of the lower plate 6, enters the ring 11 after passing through the outer periphery of the ring 8 and the diaphragm 9, Next, for example, after the ring 11 has advanced by a quarter turn, the ring 11 enters the outer peripheral S pole of the first plate magnet 12 fixed to the inner periphery of the ring 11 as shown in FIG.

  The magnetic flux flows as it is to form a magnetic circuit. In this magnetic circuit, the gap between the inner N pole of the first plate magnet 12 and the upper surface S pole of the second plate magnet 7 becomes a magnetic gap. The voice coil 10 is given an electromagnetic field driving force, whereby vibration is transmitted to the diaphragm 9 to which the voice coil 10 is fixed, and sound output is generated.

  Here, the progression of the magnetic flux in the magnetic gap will be described again.

  The magnetic flux emitted from the N pole inside each of the first plate magnets 12 shown in FIGS. 4 and 7 travels substantially inward in the magnetic gap and crosses the voice coil 10 in a substantially orthogonal state. This is very important for increasing the electromagnetic field driving force, and is a significant feature in the present embodiment.

  In the present embodiment, the reason why the magnetic flux travels substantially inward in the magnetic gap and crosses the voice coil 10 in a substantially orthogonal state will be considered.

  Generally speaking, the magnetic flux emitted from the north pole of the first plate magnet 12 tends to travel obliquely to the south pole of the upper surface of the second plate magnet 7 with a short distance (in this case) The magnetic flux crosses the voice coil 10 at a slight angle.) By receiving the repulsion of the N pole on the lower surface of the second plate magnet 7, it is actually lifted by the repulsive force. In this embodiment, it is considered that the magnetic flux travels substantially inward in the magnetic gap and crosses the voice coil 10 in a substantially orthogonal state.

  In the present embodiment, since the first plate magnet 12 and the second plate magnet 7 are provided on both sides of the magnetic gap as described above, so-called magnetic force is increased, and as a result, the sound output by the diaphragm 9 is performed. Can also be large.

  Since the first plate-like magnet 12 and the second plate-like magnet 7 for increasing the magnetic force are literally plate-like and thin themselves, as a result, the overall shape can be made very thin. .

  A magnetic fluid is interposed only between the side surface portion in the longitudinal direction of the second plate magnet 7 and the voice coil 10. The action of the magnetic fluid 14 can suppress the rolling phenomenon and reduce gap defects, and can improve the heat radiation effect from the voice coil 10 to improve the input resistance.

  In addition, when a magnetic fluid is used for the magnetic gap in a conventional speaker structure having an annular magnetic circuit, the internal air is sealed by the magnetic fluid, so that the air flow is blocked and the characteristics deteriorate. However, in the configuration of the present invention, since the magnetic fluid is interposed only between the longitudinal side surface portion of the second plate magnet 7 and the voice coil 10, the second plate magnet 7 Since air can flow between the side surface portion in the short-side direction and the voice coil 10, the air flow in the portion surrounded by the second plate magnet 7, the vibration plate 9 and the magnetic fluid 14 is maintained. It is not blocked and the vibration of the diaphragm is not limited.

  As described above, the present invention includes the first and second plate magnets arranged in the horizontal direction or the substantially horizontal direction through the magnetic gap, the voice coil movably arranged in the magnetic gap, and the voice coil. The first plate magnet has a magnetic pole formed at its plate end, and the second plate magnet has a magnetic pole formed at both ends in the thickness direction, and the magnetic gap The voice coil portion of the speaker is configured so that the magnetic flux is substantially perpendicular to the voice coil portion, and is arranged in the horizontal direction or the substantially horizontal direction of the magnetic gap via the magnetic gap. Moreover, since the first and second plate magnets are arranged on both sides of the magnetic gap, it is possible to increase the magnetic force and increase the sound output.

  Furthermore, by allowing magnetic fluid to intervene only between the longitudinal side surface of the second plate magnet and the voice coil, the rolling phenomenon can be suppressed and gap defects can be reduced. The flow of air in the portion surrounded by the plate magnet, the diaphragm and the magnetic fluid is not blocked, and the vibration of the diaphragm is not restricted, so that high input resistance can be achieved. .

  As a result, it becomes very easy to use for portable devices such as mobile phones.

The perspective view which applied one Embodiment of this invention to the mobile telephone The perspective view which applied one Embodiment of this invention to the mobile telephone Exploded perspective view of the speaker Exploded perspective view of the speaker Sectional view of the speaker cut in the longitudinal direction Sectional view of the speaker cut in the short direction 6 is an enlarged cross-sectional view of a portion A in FIG. The figure explaining the state of the magnetic fluid before assembling The figure explaining the state of the magnetic fluid after assembling

Explanation of symbols

1 Body 4 Speaker 5 Upper plate 6 Lower case (lower plate)
7 Second plate magnet 12 First plate magnet 13 Frame 14 Magnetic fluid 15 Upper case

Claims (5)

Coupled to the upper and lower cases, rectangular first and second plate magnets arranged horizontally or substantially horizontally through a magnetic gap, a voice coil movably arranged in the magnetic gap, and the voice coil The first plate magnet has a magnetic pole formed at the plate end, the second plate magnet has a magnetic pole formed at both ends in the thickness direction, and the voice in the magnetic gap In the coil portion, the magnetic flux is substantially perpendicular to the voice coil portion, and a speaker in which a magnetic fluid is interposed between the side surface portion in the longitudinal direction of the second plate magnet and the voice coil. After assembling the second plate magnet to the lower case, a magnetic fluid is attached to the entire side surface of the second plate magnet, and then the voice coil is assembled. Front diaphragm and front By combining the lower case with the upper case assembled with the first plate magnet, the longitudinal side surface portion of the second plate magnet and the voice coil are generated by the magnetic force of the first plate magnet. A method for assembling a speaker, wherein a magnetic fluid is interposed only between the two. The speaker assembly method according to claim 1, wherein the rectangular first and second plate magnets are magnetically coupled to form a magnetic circuit. 2. The speaker assembling method according to claim 1, wherein the voice coil has a rectangular planar shape, and long sides on both sides of the rectangular voice coil are arranged in magnetic gaps on both sides of the rectangular second plate magnet. . The method for assembling a speaker according to claim 1, wherein an end of the first plate magnet facing the second plate magnet is an N pole. 5. An electronic device in which a speaker assembled by the speaker assembly method according to claim 1 is built in a main body.

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