JP2006166150A - Magnetic-driven-type actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of components, to lower cost, and to perform thinning in a magnetically driven actuator. <P>SOLUTION: The magnetic-driven-type actuator is composed by fixing a voice coil and one end of a damper to a sub panel which is a casing of the magnetic-driven-type actuator and fixing the other end of the damper to a magnetic circuit part composed of a yoke, a magnet fixed on the yoke and a top plate fixed on the magnet. In the magnetic-driven-type actuator, an extension part for which a part of the sub panel is projected more on the outer side than the outer peripheral part of the magnetic circuit part is formed, the extension part is provided with the coil terminal, the coil terminal of the voice coil is connected, and a notched part is formed at a position corresponding to the coil terminal passing part of the extension part in the yoke. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a magnetically driven actuator that is incorporated in a mobile communication device such as a cellular phone, notifies an incoming call by a ringing tone generated by vibrating a panel, and plays back a received sound such as a voice.

  2. Description of the Related Art Conventionally, a magnetic drive type actuator that constitutes a speaker of a type that outputs sound is incorporated into a panel that is a diaphragm of various electronic devices such as mobile communication devices such as mobile phones and PDAs (for example, patents). Reference 1).

  An example of this type of conventional magnetic drive actuator will be described with reference to the drawings. FIG. 5 is a plan view of a conventional magnetic drive actuator, and FIG. 6 is a cross-sectional view taken along the line E-E in FIG.

  First, the configuration of this magnetic drive type actuator will be described. 5 and 6, 51 is a magnetic drive type actuator, 53 is a sub-panel which is a casing of the magnetic drive type actuator 51 made of a resin molded product, and an upper surface having an upper opening 53b at the upper end of the outer cylinder part 53a. And has a lower opening 53c at the lower end. In addition, five concave portions 53d serving as air escape openings are formed on the upper surface so that air pressure sealed between a panel and a damper, which will be described later, does not suppress vibration of the damper.

  Reference numeral 4 denotes a back mesh that is fixed so as to cover the lower opening 53 c of the sub-panel 53. Reference numeral 5 denotes an air-core voice coil obtained by winding a coil winding, which is an enamel-coated copper wire, in an annular shape having a rectangular cross section. Reference numeral 56 denotes a cylindrical former made of a paper tube or a resin tube, and the upper portion of the former 56 is fixed to the upper surface of the sub-panel 53. The voice coil 5 is fixed along the outer periphery of the former 56. Reference numeral 57 denotes an annular damper having a substantially inverted L-shaped section constricted in a corrugated shape. The upper end is bent at the upper end inner surface of the former 56 and the lower end is bent at a substantially right angle inside.

  58 is a dish-shaped yoke made of a magnetic material. A part of the side surface extends outward and penetrates the window hole of the outer cylinder portion 53a of the sub-panel 53 to form an extension portion 58a. A permanent magnet 9 is fixed to the center of the yoke 58. Reference numeral 10 denotes a top plate made of a frame-like magnetic body having a through hole 10a in the center. The yoke 58, the magnet 9 and the top plate 10 constitute a magnetic circuit unit 61. Reference numeral 12 denotes an adhesive that joins the lower end of the damper 57 to the surface of the magnet 9 through the through hole 10 a of the top plate 10.

  Reference numeral 63 denotes a tinsel wire connected to the coil terminal 5 a in the vicinity of the voice coil 5, and the connecting portion is fixed to the former 56. 64 is a circuit board fixed to the extension part 58a of the yoke 58. On the circuit board 64, a user terminal 64a which is a pair of external connection terminals and a tinsel wire 63 which passes through a window hole of the outer cylinder part 53a. A pair of wiring patterns 64b for soldering the end portions are provided, and both terminals 64a and 64b are electrically connected. The window hole is closed with resin after soldering the tinsel wire 63. The coil 5 is located together with the former 56 in a magnetic gap that is a gap between the side surface of the top plate 10 and the upper end of the yoke 58.

  Next, a method for mounting the magnetic drive actuator 51 on a portable device or the like will be described. In FIG. 6, reference numeral 20 denotes a panel as a diaphragm of a portable device having a magnetic drive type actuator 51 attached thereto, which is made of, for example, acrylic resin and disposed in front of a liquid crystal screen of a cellular phone or the like. Reference numeral 21 denotes a double-sided pressure-sensitive adhesive tape that adheres the upper surface of the sub-panel 53 and the lower surface of the panel 20. When the magnetic drive actuator 51 is mounted on a portable device or the like, processing such as soldering to the customer board side is performed at the user terminal 64a.

  Next, the operation of the magnetic drive type actuator 51 will be described. The damper 57 vibrates due to the relative displacement between the coil 5 and the magnetic circuit 61 due to the mutual interference between the magnetomotive force generated in the coil 5 and the magnetic force of the magnet 9 depending on the frequency of the drive signal input to the voice coil 5. To do. Since the magnetic circuit unit 61 is elastically supported by the sub panel 53 by the damper 57, the vibration of the magnetic circuit unit 61 is transmitted to the panel 20 through the sub panel 53, and on the other hand, the driving force of the coil repelled by the magnetic gap of the magnetic circuit is also generated. The panel 20 such as a portable device to which the magnetic drive type actuator 51 is attached resonates and generates an acoustic output.

  However, in the magnetic drive type actuator 51 configured as described above, the magnetic circuit unit 61 vibrates violently at the resonance point. Therefore, if a metal wire having a small diameter, such as the coil terminal 5a of the voice coil 5, is placed here, disconnection is caused. there is a possibility. For this reason, the coil terminal 5a is connected to the tinsel wire 63 near the voice coil 5 by soldering or the like, and this soldered portion is fixed to the former 56 by bonding or the like. Then, the tinsel wire 63 is drawn and soldered for each polarity (two) from the fixed portion to the soldering portion 65 on the circuit board 64 side. For this reason, the parts cost and the number of man-hours are increased, and the space near the soldering part on the magnetic circuit part 61 side is narrow, so that the bonding operation to the former 56 is difficult.

In order to solve the above-mentioned problems in the prior art, the present applicant has proposed a magnetic drive type actuator in which the number of parts is reduced and the cost is reduced in the structure around the external connection terminal. The configuration of the drive actuator will be described.
7 is a plan view of a magnetic drive actuator according to the prior application of the present applicant, FIG. 8 is a sectional view taken along the line CC in FIG. 7, and FIG. 9 is a sectional view taken along the line DD in FIG.

    First, the configuration of this magnetic drive type actuator will be described. 7 to 9, reference numeral 31 denotes a magnetic drive type actuator, and 33 denotes a sub-panel which is a housing of the magnetic drive type actuator 31 made of a resin molded product, and is provided between the outer cylinder part 33a and the inner cylinder part 33b. It has a shape connected at the upper end, and the upper surface has an upper opening 33c projecting inward from the inner cylindrical portion 33b. Further, five concave portions 33d are formed on the upper surface as air escape portions. One side of the upper surface of the sub-panel 33 extends from the outer tube portion 33a to form an extension portion 33e.

  Reference numeral 37 denotes an annular damper having a substantially inverted U-shaped cross section constricted in a corrugated shape, and both lower ends are bent outward at a right angle. Reference numeral 38 denotes a dish-shaped yoke made of a magnetic material. Reference numeral 41 denotes a magnetic circuit unit including the yoke 38, the magnet 9, and the top plate 10.

  A lead frame 13 is insert-molded in the extending portion 33e of the sub-panel 33. On the lead frame 13, a user terminal 13a and a wiring pattern 13b for directly soldering the coil terminal 5a are formed. Reference numeral 14 denotes a soldering portion. Reference numeral 15 denotes a protective coat made of resin covering the coil terminal 5a from the voice coil 5 to the soldered portion 14.

  Since other configurations are the same as those of the conventional magnetic drive actuator 51, the same components are denoted by the same reference numerals and names, and detailed description thereof is omitted. The action of the magnetic drive actuator 31 is the same as that of the magnetic drive actuator 51.

  Next, the effect of the magnetic drive actuator 31 in the prior application will be described. Since the vibration amount on the sub-panel 33 side is smaller than that on the magnetic circuit unit 41 side, the wiring of the coil terminal 5a is stable in quality. Moreover, it is not necessary to use a tinsel wire by placing the coil terminal 5 on the sub-panel 33 side and protecting the coil terminal 5a with the protective coating 15. For this reason, the soldering operation | work with the coil terminal 5a and a tinsel wire, and the operation | work which adhere | attaches this soldering part to a former etc. become unnecessary. Further, since the coil 5 is disposed on the outer surface of the damper 37, a conventional former is no longer necessary. As a result, there is a cost reduction effect due to parts cost and man-hour reduction. Further, since the user terminal 13a is exposed on both the upper and lower surfaces of the extending portion 33e, it is convenient for connection to the substrate of the device on which the magnetic drive type actuator 31 is mounted, and the space on the lower surface side of the extending portion 33e is a lead wire. There is an effect that can be effectively used in the routing and placement of the.

Japanese Patent Laying-Open No. 2003-143690 (FIG. 1, page 3)

  The magnetic drive actuator of the prior application has many effects that the number of parts can be reduced and the cost can be reduced in the structure around the external connection terminal. However, the magnetic drive actuator of the prior application forms an extension part in which a part of the sub-panel is projected outside the outer peripheral part of the magnetic circuit part, and a coil terminal is provided in the extension part to provide a coil terminal of the voice coil. Since it is configured to be connected, there is a risk that the coil terminal provided on the sub panel and the magnetic circuit unit vibrating on the protective coat may collide with each other when the magnetic circuit unit vibrates, and therefore, the interval between the magnetic circuit unit and the sub panel is increased. It was necessary to enlarge. As a result, there arises a problem that the thickness of the magnetic drive type actuator increases.

  The present invention has been made to further solve the problems of the prior application, and its object is to reduce the number of parts by reducing the number of parts in the structure around the external connection terminals, and at the same time to reduce the thickness. It is to provide a magnetic drive type actuator.

  The means of the present invention for achieving the above-mentioned object is to fix a voice coil and one end of a damper to a sub-panel which is a housing of a magnetic drive type actuator, and fix the other end of the damper to a yoke and the yoke. In a magnetic drive type actuator fixed to a magnetic circuit unit composed of a magnet and a top plate fixed on the magnet, a part of the sub-panel protrudes outward from the outer peripheral part of the magnetic circuit unit. A protruding portion is formed, a coil terminal is provided in the extending portion to connect the coil terminal of the voice coil, and a notch portion is formed at a position corresponding to the coil terminal passing portion of the extending portion in the yoke. It is characterized by that.

  In addition, a lead frame is embedded in the extended portion of the sub-panel, and the coil terminal is formed on the lead frame.

  Further, a part of the lead frame is exposed as a user terminal on both upper and lower surfaces of the extending portion.

  According to the present invention, the voice coil and one end of the damper are fixed to the sub-panel which is the housing of the magnetic drive type actuator, and the other end of the damper is fixed to the yoke, the magnet fixed on the yoke, and the magnet. In a magnetic drive type actuator fixed to a magnetic circuit unit comprising a fixed top plate, an extension part is formed by projecting a part of the sub panel outward from the outer peripheral part of the magnetic circuit part. By providing a coil terminal at the outlet and connecting the coil terminal of the voice coil, the number of parts can be reduced, the cost can be reduced, the work can be simplified, and the man-hour can be reduced. By forming a notch for escaping the part, it was possible to obtain a magnetically driven actuator that achieved a reduction in thickness.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a plan view of a magnetic drive type actuator according to the best mode of the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, FIG. 3 is a cross-sectional view taken along line BB in FIG. It is a perspective view of a yoke. In the description of the embodiment of the present invention, the same elements as those of the magnetic drive actuator of the prior application shown in FIGS.

  First, the configuration of this magnetic drive type actuator will be described. 1 to 4, reference numeral 1 denotes a magnetic drive type actuator, 3 denotes a sub-panel which is a casing of the magnetic drive type actuator 1 made of a resin molded product, and a space between the outer cylinder part 3a and the inner cylinder part 3b. It has a shape connected at the upper end, and the upper surface protrudes inward from the inner cylindrical portion 3b and has an upper opening 3c. Further, five concave portions 3d are formed on the upper surface as air escape portions. One side of the upper surface of the sub-panel 3 extends from the outer cylinder portion 3a to become an extension portion 3e.

  Reference numeral 7 denotes an annular damper having a substantially inverted U-shaped cross section constricted in a corrugated shape, and both lower ends are bent outward at a right angle. 8 is a dish-shaped yoke made of a magnetic material, and is provided with a notch 8a. Reference numeral 11 denotes a magnetic circuit unit including a yoke 8, a magnet 9, and a top plate 10.

  Other configurations are the same as those of the magnetic drive actuator 31 of the prior application, and the same components are denoted by the same reference numerals as described above, and description thereof is omitted. The action of the magnetic drive actuator 1 is the same as that of the magnetic drive actuator 31.

  Next, differences in configuration between the magnetic drive actuator 31 of the prior application and the magnetic drive actuator 1 according to the best mode of the present invention will be described. As shown in FIG. 4, the yoke 8 in the magnetic drive type actuator 1 of the present invention is provided with a notch 8a, and the notch 8a is wired to the extension 3e of the sub-panel 3 as shown in FIG. The coil terminal 5a is provided at a position corresponding to the coil terminal passage part by the protective coat 15 that protects the coil terminal 5a, and escapes from the coil terminal passage part.

  That is, in the magnetic drive type actuator 1, the terminal processing portion can escape by the notch portion 8 a of the yoke 8, so that the distance between the sub-panel 3 and the magnetic circuit portion 11 can be made closer to the depth of the notch portion 8 a. became. As a result, the height of the damper 7 and the outer cylindrical portion 3a of the sub-panel 3 can be reduced, so that the height H1 of the magnetic drive actuator 31 of the prior application shown in FIG. The thickness H2 of the magnetic drive actuator 1 is reduced by reducing the height H2.

  Next, effects of the embodiment of the present invention will be described. Since the amount of vibration on the sub-panel 3 side is smaller than that on the magnetic circuit unit 11 side as in the previous application, the wiring of the coil terminal 5a is stable in quality. Moreover, it is not necessary to use a tinsel wire by wiring the coil terminal 5a to the sub-panel 3 side and protecting it with the protective coat 15. For this reason, the soldering operation | work with the coil terminal 5a and a tinsel wire, and the operation | work which adhere | attaches this soldering part to a former etc. become unnecessary. Further, since the voice coil 5 is disposed on the outer surface of the damper 7, a conventional former is no longer necessary. As a result, in addition to the effects similar to the previous application such as cost reduction by reducing the parts cost and man-hours, there is an effect that the thickness can be reduced without deteriorating the characteristics as a magnetic drive actuator by the notch portion 8a provided in the yoke. .

  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 magnetic drive type actuator which is an embodiment of the invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a perspective view of the yoke used for the magnetic drive type actuator of the present invention. It is a top view of the conventional magnetic drive type actuator. It is EE sectional drawing of FIG. It is a top view of the magnetic drive type actuator of a prior application. It is CC sectional drawing of FIG. It is DD sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 31, 51 Magnetic drive type actuator 3, 33, 53 Subpanel 3a Outer cylinder part 3b Inner cylinder part 3e Extension part 5 Voice coil 5a Coil terminal 7, 37, 57 Damper 8, 38, 58 Yoke 8a Notch part 9 Magnet 10 Top plate 11, 41, 61 Magnetic circuit part 13 Lead frame 13a User terminal

Claims (4)

  A voice coil and one end of a damper are fixed to a sub-panel which is a casing of a magnetic drive type actuator, and the other end of the damper is fixed to a yoke, a magnet fixed on the yoke, and a top plate fixed on the magnet. In the magnetic drive type actuator fixed to the magnetic circuit portion, an extension portion is formed by projecting a part of the sub panel outward from the outer peripheral portion of the magnetic circuit portion, and a coil terminal is provided on the extension portion. A magnetic drive actuator characterized in that a notch portion is formed at a position corresponding to a coil end passage portion of the extension portion of the yoke while being provided and connected to the coil end of the voice coil.   2. The magnetic drive type actuator according to claim 1, wherein the coil terminal passage portion of the extension portion is coated with a protective coating.   The magnetic drive type actuator according to claim 1 or 2, wherein a lead frame is embedded in an extension part of the sub-panel, and the coil terminal is formed on the lead frame. 4. The magnetic drive type actuator according to claim 3, wherein a part of the lead frame is exposed as a user terminal on both upper and lower surfaces of the extending portion.

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