Patent Publication Number: US-2006001324-A1

Title: Pattern coil type vertical vibrator

Description:
BACKGROUND OF THE INVENTION  
      1. Field of the Invention  
      The present invention relates to a vertical vibrator, and more particularly to a pattern coil type vertical vibrator, in which the pattern of a coil serving as a route for current are printed on a base, thereby reducing the number of required components and the number of steps of a manufacturing process and facilitating the thin profile of products.  
      2. Description of the Related Art  
      Generally, sound and vibration are used to inform users of an incoming call. A small-sized vibrating motor is driven to generate vibration, and driving force of the vibrating motor is transmitted to a housing of a device, thereby vibrating the whole portions of the device.  
      A vibrating motor, which is one incoming call notification means applied to a communication device, such as a cellular phone, converts electrical energy to mechanical energy using the principle of electromagnetic force, and is installed in a cellular phone for informing users of an incoming call without sound.  
      As the cellular phone market has been rapidly expanding and cellular phones have grown to include many additional functions, components of the cellular phone are developed toward miniaturization and high quality. Accordingly, a vibrating motor having a novel structure, which solves drawbacks of the conventional vibrating motor and has an improved quality, are required now.  
       FIG. 1  is a cross-sectional view of a conventional coin type vibrating motor. The conventional coin type or flat type vibrating motor  1  comprises a stator  20 , a rotor  10  installed rotatably against the stator  20 , and a housing  30  accommodating the stator  20  and the rotor  10 .  
      When external power is applied to the vibrating motor  1  through a pair of brushes  25  installed on a lower substrate  21  of the stator  20 , currents having different polarities flow along the brushes  25 . Since upper ends of the brushes  25  elastically contact a commutator  15  formed on the lower surface of the rotor  10 , power is supplied to a wound coil  12  of the rotor  10  through the commutator  15  contacting the brushes  25 .  
      The rotor  10  is rotated in one direction centering on a shaft  31  by interaction between an electric field formed by a direction of the flow of the current induced to the wound coil  12  and a magnetic field formed by a magnet  22  of the stator  20 .  
      Here, contact points between the brushes  25  and segments of the commutator  15  contacting the brushes  25  vary whenever the rotor  10  is rotated, and the polarity of the power is continuously changed. Thereby, the rotor  10  having the eccentric center of gravity is continuously rotated, thus inducing vibration used as a signal expressing the notification of an incoming call.  
      In  FIG. 1 , non-described reference numeral  14  represents an insulator surrounding the wound coil  12  and a weight, non-described reference numeral  32  represents a bearing member, and non-described reference numeral  35  represents a base for sealing the opened lower part of the housing  30 .  
      The above vibrating motor  1  generates mechanical vibration by rotating the rotor  10  having a weight eccentrically disposed when external power is supplied to the vibrating motor  1 . The rotating force of the rotor  10  is mainly embodied by a commutator or brush type structure of the motor, which supplies current to the coil of the rotor  10  by a commutating action through contact points between the brushes  25  and the commutator  15 .  
      However, when the above-structured vibrating motor  1  is driven, the brushes  25  pass through a space between segments of the commutator  15 , thus causing mechanical friction and electrical sparks between the brushes  25  and the segments of the commutator  15  and abrasion of the brushes  25  and the commutator  15 , thereby producing foreign substances, such as black powder and shortening the lifespan of the motor.  
      Accordingly, in order to solve the drawbacks of the conventional commutator or brush type vibrating motor, a multifunctional actuator, serving as means for inducing sound or vertical vibration using the resonant frequency of a vibrometer, has been developed.  
       FIG. 2  is a cross-sectional view of a conventional multifunctional actuator. As shown in  FIG. 2 , the actuator  2  comprises a main case  40  having an internal space, a vibrating plate  50  installed on the upper part of the main case  40  and provided with a sound-generating coil  52  generating sound according to a signal source, installed on the lower surface thereof, a magnet  60  vertically installed in the main case  40  and provided with an upper plate  62  mounted on the upper surface thereof for forming a magnetic circuit, the upper plate  62 , a weight  65  constituting a vibrating body together with a yoke  64  mounting the magnet thereon, a plate spring  66  for elastically supporting the vibrating body in the main case  40 , and a vibration-generating coil  42 , placed just below the vibrating body, for generating vibration.  
      In  FIG. 2 , non-described reference numeral  45  represents an upper case for closing the upper part of the main case  40 , and non-described reference numeral  44  represents a base provided with the vibration-generating coil  42  mounted thereon.  
      The actuator  2  supplies external power to the sound-generating coil  52  or the vibration-generating coil  42  through a lead wire (not shown), thereby selectively generating sound and vibration. When power is supplied to the sound-generating coil  52 , the vibrating plate  50  is finely vibrated by interaction between a magnetic field generated from a magnetic circuit constituted by the magnet  60 , the upper plate  62  and the yoke  64  and an electric field generated from the sound-generating coil  52 , thereby generating sound.  
      On the other hand, when power is supplied to the vibration-generating coil  42 , the vibrating body, including the magnet  60 , the upper plate  62 , the yoke  64  and the weight  65 , which is suspended by the plate spring  66 , is vertically vibrated by interaction between the magnetic field generated from the magnetic circuit including the magnet  60 , the upper plate  62  and the yoke  64  and an electric field generated from the vibration-generating coil  42 .  
      Here, the vibrating degree of the vibrating body varies according to the intensity and frequency of a signal for generating the vibration. In case that vertical vibrating width of the vibrating body is larger than a predetermined value, the vibrating body contacts the sound-generating coil  52  serving as an upper structure or the vibration-generating coil  42  serving as a lower structure, thus generating a touch tone. For this reason, as shown in  FIG. 2 , magnetic bodies  70 , serving as dampers absorbing impact when the vibrating body contacts the lower structure, are placed on the lower surface of the yoke  64 .  
      The actuator  2  requires a large number of components and has a complicated structure, thus limiting miniaturization and simplification of products and increasing production costs.  
      Accordingly, in order to solve the above problems of the actuator  2 , a vertical vibrator  3 , which requires a small number of components and generates vertical vibration, has been developed.  
       FIG. 3  is a cross-sectional view of a conventional vertical vibrator. As shown in  FIG. 3 , the vertical vibrator  3  comprises a case  81  having an internal space with a designated volume, a magnet  82  vertically installed therein, a spring member  86  installed between the housing  81  and a yoke  84  for vibrating a vibrating body, which includes the yoke mounting the magnet  82  thereon and a weight  85  installed on the outer part of the yoke  84  and constitutes a magnetic circuit together with the magnet  82 , and a vibration-generating coil  87  placed on the upper surface of a base  88  closing the lower part of the housing  81 .  
      When power is supplied to the vibration-generating coil  87 , a magnetic flux, which is the flow of a magnetic field (B) generated from the magnetic circuit constituted by the magnet  82  and the yoke  84 , is generated from the lower surface of the magnet  82  and coupled with the vibration-generating coil  87 , thereby forming a route flowing toward the lower end of the yoke  84 . The vibrating body, which includes the magnet  82 , the yoke  84  and the weight  85  and is suspended by the spring member  86  in the housing  81 , is vertically vibrated by interaction between a magnetic field of the magnetic circuit and an electric field of the vibration-generating coil  87 .  
      Conventionally, in order to install the vibration-generating coil  87  on the upper surface of the base  88 , a worker fixes the vibration-generating coil  87 , which was wound in a cylindrical shape in a separate working line, to the base  88 , and then solders or bonds the vibration-generating coil  87  using a bonding agent to a lead wire (not shown). Here, the worker must carefully and accurately perform the above coil-assembling step such that the center of the vibration-generating coil  87  coincides with a concentric circle of the yoke  84  and the verticality of the vibration-generating coil  87  coincides with that of a vertical shaft passing through the center of the yoke  84 .  
      In this case, since the step of soldering/bonding the vibration-generating coil  87  to the upper surface of the base  88  and the step of coinciding the concentric circle and verticality of the vibration-generating coil  87  to those of a magnetic circuit are complicated, worker&#39;s burden increases, thereby raising production costs of final products and deteriorating productivity.  
      Further, in order to ensure the stable vertical vibrating width of the vibrating body including the weight  85 , the vertical vibrator  3  must be designed in consideration of the height (h) of the vibration-generating coil  87  fixed to the base  88 . Accordingly, the thickness of the vertical vibrator  3  is limited.  
      Since the vertical vibrating width of the vibrating body in the limited inner space of the housing  81  must be designed in consideration of the height (h) of the vibration-generating coil  87  fixed to the base  88 , it is difficult to obtain a sufficient degree of vibration of the vibrating body.  
     SUMMARY OF THE INVENTION  
      Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a pattern coil type vertical vibrator, which reduces the number of components and the number of steps of a manufacturing process to reduce production costs, and has a thin thickness to facilitate the miniaturization of products.  
      It is another object of the present invention to provide a pattern coil type vertical vibrator, which maximizes a vertical vibrating width of a vibrating unit to obtain a sufficient amount of the vibration of the vibrating unit.  
      In accordance with the present invention, the above and other objects can be accomplished by the provision of a pattern coil type vertical vibrator comprising: a housing defining an internal space having designated dimensions; a magnetic circuit unit placed in the internal space of the housing, and including a magnet perpendicularly placed and a yoke for fixedly receiving the magnet therein; spring members provided with upper ends fixed to the housing and lower ends fixed to the magnetic circuit unit for vertically and elastically supporting the magnetic circuit unit; a vibrating unit, including a weight assembled with the yoke of the magnetic circuit unit, vertically vibrated together with the magnetic circuit unit through the spring members; and a pattern coil, printed on an upper surface of a base for closing a lower surface of the housing, to which power is supplied, so that the pattern coil is interlinked with a magnetic field generated from the magnet and generates force just upwardly when the power is supplied to the pattern coil.  
      Preferably, an injection hole may be formed through the upper surface of the housing so that a damping magnetic fluid is injected into the housing and deposited onto the spring members.  
      Further, preferably, a lower plate magnetized by the magnetic force of the magnet may be installed on the lower surface of the magnet.  
      Moreover, preferably, the weight may be made of a nonmagnetic material having a high specific gravity, which is not magnetized by the magnetic force of the magnet.  
      Preferably, the magnetic circuit unit may include a yoke inserted into a central hole formed through a central portion of the weight, and a magnet assembled into an opening of the yoke.  
      More preferably, the outer surface of the weight may be spaced from the inner surface of the housing by a designated gap.  
      Preferably, the magnetic circuit unit may include a yoke provided with an opening for receiving the weight, and a magnet inserted into a central hole formed through a central portion of the weight.  
      More preferably, the outer surface of the yoke may be spaced from the inner surface of the housing by a designated gap.  
      Preferably, the pattern coil may be electrically connected to positive and negative lead wires, to which external power is supplied.  
      Further, preferably, the pattern coil may be electrically connected to positive and negative terminals for surface mounting, of which the patterns are printed on the lower surface of the base.  
      Moreover, preferably, the pattern coil may be a conductor having a scroll shape, of which the pattern is printed on the upper surface of the base.  
      Preferably, the base may include a multi-layered substrate having at least two ceramic sheets, each sheet provided with a pattern coil printed on the upper surface thereof, and a plurality of via holes formed through the ceramic sheets vertically stacked to electrically connect the pattern coils. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
      The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:  
       FIG. 1  is a cross-sectional view of a conventional coin type vibrating motor;  
       FIG. 2  is a cross-sectional view of a conventional multifunctional actuator;  
       FIG. 3  is a cross-sectional view of a conventional vertical vibrator;  
       FIGS. 4   a  and  4   b  illustrate a pattern coil type vertical vibrator in accordance with a first embodiment of the present invention, and more specifically:  
       FIG. 4   a  is a cross-sectional view of the pattern coil type vertical vibrator, which is provided with a lower plate; and  
       FIG. 4   b  is a cross-sectional view of the pattern coil type vertical vibrator, which is not provided with the lower plate;  
       FIG. 5  is an exploded perspective view of the pattern coil type vertical vibrator in accordance with the first embodiment of the present invention;  
       FIG. 6  is a cross-sectional view of a pattern coil type vertical vibrator in accordance with a second embodiment of the present invention;  
       FIG. 7  is an exploded perspective view of the pattern coil type vertical vibrator in accordance with the second embodiment of the present invention; and  
       FIGS. 8   a  and  8   b  illustrate another example of a base provided in the pattern coil type vertical vibrator of the present invention, and more specifically:  
       FIG. 8   a  is a longitudinal-sectional view of the above example of the base; and  
       FIG. 8   b  is an exploded perspective view of the above example of the base. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS  
      Now, preferred embodiments of the present invention will be described in detail with reference to the annexed drawings.  
       FIGS. 4   a  and  4   b  illustrate a pattern coil type vertical vibrator in accordance with a first embodiment of the present invention, and  FIG. 5  is an exploded perspective view of the pattern coil type vertical vibrator in accordance with the first embodiment of the present invention.  
      As shown in  FIGS. 4   a  and  4   b  and  FIG. 5 , the vertical vibrator in accordance with the first embodiment of the present invention comprises a housing  10 , a magnetic circuit unit  120 , spring members  130 , a vibrating unit  140 , a pattern coil  150  formed on a base for generating force interlinked with a magnetic field, thereby reducing the number of components and the number of steps of an assembling process, having a thin thickness, and maximizing a vertical vibrating width in a limited space.  
      That is, the housing  110  having a hollow cylindrical structure serves as a receiving member having a designated internal space such that an upper surface of the housing  110  is closed and a lower surface of the housing  110  is opened and sealed by a base  115 .  
      The magnetic unit  120  includes a yoke  122  and a magnet  124 , which are disposed inside the housing  110  to generate a magnetic field having a designated intensity. The yoke  122  has an approximately hollow cylindrical structure such that an upper surface of the yoke  122  is closed and a lower surface of the yoke  122  is opened.  
      The magnet  124  is a permanent magnet having a cylindrical structure, and vertically arranged such that N and S poles of the magnet  124  are longitudinally polarized. The magnet  124  is fixedly inserted into an opening  122   a  of the yoke  122 .  
      A weight  142  having a hollow cylindrical structure, which is spaced from the inner surface of the housing  110  so that the weight  142  is vertically vibrated without interference with the housing  110 , is placed on the outer surface of the yoke  122 . The magnet  124  and the weight  142  are assembled with the yoke  122 .  
      As shown in  FIG. 4   b , the upper surface of a lower plate  126  made of a magnetic material is attached to the lower surface of the magnet  124  by a bonding material so that the lower plate  126  is magnetized by magnetic force of the magnet  124 .  
      The spring members  130 , which are placed between the housing  110  and the magnetic circuit unit  120 , serve as elastic means for vertically elastically supporting the vibrating unit  140  including the magnetic circuit unit  120 .  
      As shown in  FIG. 5 , each of the spring members  130  includes a fixed ring  131  having a disk shape fixed to the closed lower surface of the housing  110 , a plurality of elastic legs  132  provided with ends connected to the fixed ring  131  and bent from the ends in a spiral shape for generating elastic force, and a fixed disk  133 , connected to the other ends of the elastic legs  132  and provided with a lower surface fixed to the center of the upper surface of the yoke  122  of the magnetic circuit unit  120 .  
      Accordingly, an upper gap (G 1 ), in which the vibrating unit  140  is vertically vibrated by the magnetic circuit unit  120  and the weight of the vibrating unit  140 , correspondingly to the sagging length of the spring member  130  is formed between the housing  110  and the magnetic circuit unit  120 .  
      The vibrating unit  140 , which is vertically vibrated by the spring members  130 , includes the hollow cylindrical weight  142  installed together with the magnet  124  inserted into the opening  122   a  of the yoke  122 . A central hole  142   a  is formed through the central portion of the weight  142 , and the yoke  122  of the magnetic circuit unit  120  is inserted into the central hole  142   a  of the weight  142 .  
      The weight  142  has a hollow cylindrical structure having the central hole  142   a  formed through the central portion thereof so that the outer surface of the weight  142  is spaced from the inner surface of the housing  110  by a designated gap (G).  
      The weight  142  integrally assembled with the yoke  122  is a nonmagnetic body, which is not magnetized by magnetic force of the magnet  124  inserted into the opening  122   a  of the yoke  122 , and is made of a material having a high specific gravity, such as tungsten, for increasing vertical vibrating efficiency.  
      Thereby, a magnetic field generated from the magnet  124  and the lower plate  126  installed on the lower surface of the magnet  124  forms a route of a magnetic flux, which flows toward the upper surface of the magnet  124  through the lower end of the yoke  122  surrounding the magnet  124 .  
      The pattern coil  150  is printed on the upper surface of the base  115  closing the opened lower surface of the housing  110  accommodating the magnetic circuit unit  120 , the spring members  130  and the vibrating unit  140  so that the pattern coil  150  is interlinked with the magnetic field generated from the magnet  124  of the magnetic circuit unit  120 .  
      The pattern coil  150  has a scroll shape such that the outer diameter from the center to the outer periphery gradually increases, and is made of a conductive material, of which the pattern is printed on the upper surface of the base  110 .  
      Current from an external power source flows along the pattern coil  150  in one direction, interlinked with the magnetic field of the magnet  124 , such that the magnetic field interacts with an electric field, generated when power is supplied to the vibrating vibrator  100 , so as to vertically vibrate the vibrating unit  140  including the magnetic circuit unit  120 .  
      As shown in  FIGS. 4   a  and  4   b , positive and negative lead wires  118   a  and  118   b , to which external power is supplied, are electrically connected to the front and rear ends of the pattern coil  150  on the upper surface of the base  115 . In this case, the vertical vibrator  100  having the positive and negative lead wires  118   a  and  118   b  is bonded to a main substrate (not shown).  
      Further, the patterns of positive and negative terminals  117   a  and  177   b  for surface mounting, which are electrically connected to both ends of the pattern coil  150 , are patterned on the lower surface of the base  115 . In this case, the vertical vibrator  100  is mounted on the surface of the main substrate (not shown) by allowing the positive and negative terminals  117   a  and  117   b  to correspond to a power supply unit formed on the main substrate.  
      Preferably, the pattern coil  150  is printed on the upper surface of the base  115  such that the outer diameter of the pattern coil  159  reaches the outer surface of the yoke  122  mounted in the central hole  142   a  of the weight  142  so as to ensure a sufficient region in which the magnetic field and the electric field are interlinked with each other.  
      In this case, the magnetic field generated from the lower surface of the magnet  124  is interlinked with the pattern coil  150 , along which current flows in one direction, when the current flows toward the upper surface of the magnet  124  through the lower end of the yoke  122  surrounding the magnet  124 , thereby generating a force for vertically vibrating the vibrating unit  140  including the magnetic circuit unit  120 .  
      A lower gap (G 2 ), which is formed between the lower surface of the magnetic circuit unit  120  and the upper surface of the pattern coil  150 , has a designated size sufficient to prevent the contact between the weight  142  and the pattern coil  150  when the vibrating unit  140  is vertically vibrated.  
      At least one injection hole  116  having a designated size is formed through the upper surface of the housing  110 , and a damping magnetic fluid (not shown) for preventing the direct contact between the housing  110  and the magnetic circuit unit  120  when the vibrating unit  140  is vertically vibrated is injected through the injection hole  116  and applied to the spring members  130 .  
      Then, the injection hole  116  is safely sealed by a tape member (not shown), on which a label is printed, thereby preventing the magnetic fluid from being leaked out.  
      The magnetic fluid is obtained by dispersing magnetic powder in a liquid into a colloidal state and adding a surface active agent to the colloidal mixture so that the magnetic powder is not precipitated or cohered by the force of gravity or the magnetic field, and, for example, is a fluid obtained by dispersing fine particles of triiron tetroxide or iron-cobalt alloy in oil or water, or a fluid obtained by dispersing particles of cobalt in toluene. These magnetic powders are ultrafine particles of a diameter of 0.01˜0.02 μm, which exhibit Brownian motion, and the concentration of the magnetic powders in the fluid is uniformly maintained even though an external magnetic field, gravity or centrifugal force is applied to the fluid.  
       FIG. 6  is a cross-sectional view of a pattern coil type vertical vibrator in accordance with a second embodiment of the present invention, and  FIG. 7  is an exploded perspective view of the pattern coil type vertical vibrator in accordance with the second embodiment of the present invention.  
      In the vertical vibrator  100 ′ as shown in  FIGS. 6 and 7 , a yoke  122 ′ of the magnetic circuit unit  120  elastically supported by the spring members  130  in the housing  110  is extended to the inner surface of the housing  110 , and a weight  142 ′ having a hollow cylindrical structure provided with a magnet  124 ′ is placed in an opening  122   a ′ of the yoke  122 ′.  
      That is, the weight  142 ′ provided with a central hole  142   a ′ is fixedly inserted into and fixed to the opening  122   a ′ of the yoke  122 ′ having the extended outer diameter by a bonding agent so that a designated gap is formed between the inner surface of the housing  110  and the outer surface of the yoke  122 ′.  
      Since the cylindrical magnet  124 ′ for generating a magnetic field having a designated intensity is inserted into and fixed to the central hole  142   a ′ of the weight  142 ′ by a bonding agent, the magnetic circuit unit  120  including the yoke  122 ′ and the magnet  124 ′ and the vibrating unit  140  including the weight  142 ′ are integrally installed in the housing  110  so that the magnetic circuit unit  120  and the vibrating unit  140  are vertically vibrated in the housing  110  by the spring members  130 .  
      Further, the pattern coil  150 , which is interlinked with the magnetic field generated from the magnet  124 ′ and generates force just upwardly when power is supplied to the vertical vibrator  110 ′, is printed on a designated position, corresponding to the magnetic circuit unit  120 , of the upper surface of the base  115 .  
      Since the outer diameter of the pattern coil  150  is extended to the outer surface of the yoke  122 ′ having the outer diameter extended to the inner surface of the housing  110 , the magnetic field generated from the lower surface of the magnet  122 ′ is interlinked with the pattern coil  150 , along which the current flows in one direction, and is then guided to the lower end of the yoke  122 ′ having the extended outer diameter surrounding the weight  142 ′ made of a non-magnetic material, thereby forming a magnetic flux flowing toward the upper part of the magnet  124 ′.  
      Here, since a region, in which the magnetic field of the magnet  124 ′ and the pattern coil  150  having the outer diameter extended to the outer surface of the yoke  122 ′ having the outer diameter extended so that the weight  142 ′ is inserted into the opening  122   a ′ of the yoke  122 ′, is increased, the vertical vibrator  100 ′ has an increased vibrating power for vertically vibrating the vibrating unit  140  including the magnetic circuit unit  120 .  
       FIGS. 8   a  and  8   b  illustrate another example of a base provided in the pattern coil type vertical vibrator of the present invention. More specifically,  FIG. 8   a  is a longitudinal-sectional view of the above example of the base, and  FIG. 8   b  is an exploded perspective view of the above example of the base.  
      The base  115  of the vertical vibrator  100  or  100 ′ of the present invention as shown in  FIGS. 8   a  and  8   b , includes a multi-layered substrate having at least two ceramic sheets  151   a ,  151   b  and/or  151   c , and a plurality of via holes  152   b ,  153   a  and  153   c  formed through the ceramic sheets  151   a ,  151   b  and  151   c  vertically stacked to electrically connect pattern coils  150   a ,  150   b  and  150   c  formed on the ceramic sheets  151   a ,  151   b  and  151   c.    
      Thereby, the pattern coils  150   a ,  150   b  and  150   c , printed on the vertically stacked ceramic sheets  151   a ,  151   b  and  151   c  are electrically interconnected in series by the via holes  152   b ,  153   a  and  153   c , and are connected to positive and negative lead wires  118   a  and  118   b  or positive and negative terminals  117   a  and  117   b . Accordingly, the power is supplied to the base  115 , and current flows along the multi-layered substrate in one direction.  
      When external power is supplied to the pattern coil  150  of the vertical vibrator  100  or  100 ′ through the positive or negative lead wire  118   a  or  118   b  or the positive or negative terminal  117   a  or  117   b , an electric field is formed around the pattern coil  150  by the current flowing from one end of the pattern coil  150  to the other end of the pattern coil  150 .  
      In case that the base  115  includes a plurality of ceramic sheets  151   a ,  151   b  and  151   c  provided with the pattern coils  150   a ,  150   b  and  150   c  printed on the upper surface thereof, the pattern coils  150   a ,  150   b  and  150   c  constitute a series circuit through the via holes  152   b ,  153   a  and  153   c , thereby forming an electric field around the pattern coils  150   a ,  150   b  and  150   c  by the current flowing from one ends of the pattern coils  150   a ,  150   b  and  150   c  to the other ends of the pattern coils  150   a ,  150   b  and  150   c.    
      As shown in  FIGS. 4   a  and  4   b  and  FIG. 5 , the magnetic circuit unit  120 , elastically supported in the internal space of the housing  110  by the spring members  130 , includes the yoke  122  inserted into the central hole  142   a  formed through the central portion of the weight  142 , and the magnet  124  assembled into the opening  122   a  of the yoke  122 , and a gap (G) having a designated length is formed between the outer surface of the weight  142  and the inner surface of the housing  110 .  
      Alternately, as shown in  FIGS. 6 and 7 , the magnetic circuit unit  120  includes the yoke  122 ′ provided with the opening  122   a ′ for receiving the hollow cylindrical weight  142 ′, and the magnet  124 ′ inserted into the central hole  142   a ′ formed through the central portion of the weight  142 ′, and a gap (G) having a designated length is formed between the outer surface of the yoke  122 ′ and the inner surface of the housing  110 .  
      In this state, the magnetic field generated from the magnet  124  or  124 ′ flows outwardly from the center(s) of the pattern coil  150  or the pattern coils  150   a ,  150   b  and  150   c , is simultaneously interlinked with the pattern coil  150  or the pattern coils  150   a ,  150   b  and  150   c  printed on the base  115 , and flows toward the upper surface of the magnet  124  contained in the yoke  122  through the lower end of the yoke  122  inserted into the central hole  142   a  of the weight  142 , as shown in  FIGS. 4   a  and  4   b , or the upper surface of the magnet  124 ′ inserted into the central hole  142   a ′ of the weight  142 ′, as shown in  FIG. 6 .  
      Here, based on Fleming&#39;s left hand law, in which, when a left hand is spread such that the thumb, the first finger and the second finger are perpendicular, the first finger points in the direction of the magnetic field, the second finger points in the direction of the current and the thumb points in the direction of the force, the pattern coil  150  or the pattern coils  150   a ,  150   b  and  150   c  generates force for vertically vibrating the vibrating unit  140  including the magnetic circuit unit  120 .  
      In case that the pattern coil  150  or the pattern coils  150   a ,  150   b  and  150   c  is extended to the outer surface of the yoke  122 ′ extended to surround the weight  142 ′, the region(s) of the pattern coil  150  or the pattern coils  150   a ,  150   b  and  150   c  interlinked with the magnetic field flowing in a spiral direction along the upper surface of the base  115  is extended, thereby extending a region for generating the force for vertically vibrating the vibrating unit  140  and increasing the vibrating power of the vertical vibrator  100 ′.  
      As described above, the vibrating unit  140  including the magnetic circuit unit  120  is vertically vibrated in a predetermined width by the force generated due to the interlinkage between the magnetic field generated from the magnetic circuit unit  120  and the pattern coil  150  or the pattern coils  150   a ,  150   b  and  150   c , and the vertically vibrating width of the vibrating unit  140  is determined by the elastic force of the spring members  130  elastically supporting the vibrating unit  140 .  
      Here, the pattern coil  150  or the pattern coils  150   a ,  150   b  and  150   c  generating the force for vertically vibrating the vibrating unit  140  including the magnetic circuit unit  120  is (are) printed on the upper surface of the base  115  when the base  115  is manufactured. Accordingly, compared to a conventional vibration-generating coil  87  having a designated height (H) soldered or bonded to the base  88 , the pattern coil  150  or the pattern coils  150   a ,  150   b  and  150   c  reduce(s) the overall height of the housing  110 , thereby facilitating the manufacture of a thin vertical vibrator having a reduced overall thickness (T).  
      Otherwise, the upper and lower gaps (G 1  and G 2 ) in the limited internal space of the housing  110  correspond to the height of the overall height of the conventional vibration-generating coil  87 , thereby increasing the vertically vibrating width of the vibrating unit  140  and allowing the vibrating unit  140  to obtain a sufficient vibrating amount.  
      As described above, the present invention provides a pattern coil type vertical vibrator, in which the pattern of a coil for generating a force applied in a vertical direction by interaction with a magnetic field of a magnetic circuit unit is printed on a base, thereby omitting a step of soldering/bonding a separate coil on the base and reducing the number of required components. Accordingly, it is possible to reduce production costs of the vertical vibrator and improve manufacturing efficiency of the vertical vibrator.  
      Further, since the height of the housing is designed in consideration of the height of the pattern coil, the pattern coil type vertical vibrator of the present invention has an overall thin thickness compared to the conventional vertical vibrators.  
      Moreover, since a vibrating unit of the pattern coil type vertical vibrator of the present invention ensures a vertical vibrating width to correspond to the height of the conventional coil, it is possible to increase the vertical vibrating width of the vibrating unit, thereby allowing the vibrating unit to have sufficient vibration.  
      Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.