JP4602888B2 - Vibration generator - Google Patents

Description

  The present invention relates to a vibration generator that includes a movable body having a magnetic core and a coil, and a magnet facing the magnetic core, and applies vibrations to an electronic device, for example.

  Various electronic devices such as mobile phones and game machines are provided with a vibration generating device. By continuously driving the vibration generating device, for example, an incoming call notification of a mobile phone is performed and an operation unit is operated. In addition, by driving the vibration generating device only for a short time, it is possible to give an operational feeling to the operator.

  Conventional vibration generators generally have a mass with a mass biased on the output shaft of a small motor, and generally generate vibration by reaction when the output shaft is rotated. However, the vibration generator using a motor has a drawback that the mass of the entire apparatus becomes heavy because the mass of the motor is large. In addition, since the vibration generation time is equal to the energization time to the motor in this vibration generator, it is necessary to lengthen the energization time to the motor and increase the power consumption in order to generate the vibration for a predetermined time. . In addition, since the rise time from when the motor is energized to when vibration is generated is relatively long, it is difficult to generate shocking and good vibration.

  In the following Patent Document 1, a long magnet is provided on a movable body, and a coil that applies a magnetic field to the magnet on the fixed side is disclosed. The vibration generating device described in Patent Document 1 does not use the rotational force of the motor, but generates vibration in the movable part by electromagnetic force, so that the rise of vibration is relatively fast, and vibration is also generated by pulse energization. There is an advantage that power consumption can be reduced.

  However, the vibration generating device described in Patent Document 1 is a device in which a long movable body vibrates in a direction perpendicular to the longitudinal direction, and therefore a large space is required when the movable body vibrates. It becomes. Moreover, since it is necessary to form a coil so that it may oppose so that the circumference | surroundings of a elongate movable body may be surrounded, the coil winding operation | work is complicated.

  Patent Document 2 below discloses a vibration generator in which a magnetic core around which a coil is wound is driven in the longitudinal direction.

In this vibration generator, a long movable body having a magnetic core and a coil wound around the magnetic core is provided, and a magnet is arranged in a direction orthogonal to the axial direction of the movable body. A magnetic field crosses the coil, and the movable body vibrates in the longitudinal direction by electromagnetic force generated by the coil current and the magnetic field from the magnet.
JP 2005-175867 A Special table 2002-525007 gazette

  However, since the vibration generator described in Patent Document 2 has a structure in which a magnet is opposed to the side of a movable body having a magnetic core and a coil, the dimensions of the vibration generator in a direction orthogonal to the moving direction of the movable body. Becomes larger.

  In addition, since this vibration generator is a system in which a current orthogonal to the magnetic field generated from the magnet is applied to the coil and the movable body is driven by the electromagnetic force generated by the current and the magnetic field, it is restrained by a spring or the like. In order to generate large vibration energy by the movable body, it is necessary to increase the amount of current that is supplied to the coil.

  The present invention solves the above-described conventional problems, and can generate a relatively large vibration energy by effectively using a current in a small space, and can generate a sharp vibration. An object of the present invention is to provide a simple vibration generator.

The present invention relates to a vibration generator including a movable body having a magnetic core and a coil wound around the magnetic core, a spring member that supports the movable body, and a magnet that faces the movable body.
2 the magnetic core is greater than the widthwise dimension longitudinal dimension is the direction perpendicular to the longitudinal direction is a winding direction along the center line of the coil, the magnet is oriented in the longitudinal direction of the magnetic core Facing the same magnetic pole to each of the two end faces ,
The spring member is formed by bending a wire such that curved portions that are curved in opposite directions toward the width direction are alternately repeated toward the longitudinal direction,
Both end portions of the spring member are fixed at a distance in the longitudinal direction, the movable body is held by a holding portion in the middle of the spring member, and the spring member is between one end portion and the holding portion. Is a first deformed portion having the curved portions that are opposite to each other, and a portion between the other end and the holding portion is a second deformed portion having the curved portions that are opposite to each other.
When no power is supplied to the coil, the movable body is, by the spring member, the end faces of the magnetic core is held in the neutral position away from the respective magnets, when energizing the coil, magnetized movable One of the first deformable portion and the second deformable portion is extended by the magnetic force of the body and the magnet, and the other is contracted, and the movable body is vibrated in the longitudinal direction. .

  In the vibration generator of the present invention, when the coil is energized, the magnetic core is magnetized, and both ends thereof become different magnetic poles. The movable body is directly driven in the longitudinal direction by the attractive force or the repulsive force between the magnetic pole and the magnetic pole of the magnet. Since the movable body is directly driven by the magnetic pole of the magnetic core and the magnetic pole of the magnet, the driving efficiency is improved compared to the conventional one using electromagnetic force, and the energization amount is not excessive. Large vibration energy can be generated. Further, since the movable body is held at the neutral position between the left and right magnets, the movable body starts to move immediately after the magnetic core is magnetized, and the rise time of the vibration becomes faster. Further, since the vibration direction of the movable body is the longitudinal direction, the space required for vibration is reduced, and the vibration generator can be miniaturized.

The present invention, since the magnetic poles of the opposing surfaces of the right and left of the magnet is the same, by energizing the coil of the movable body, when magnetizing the magnetic core, attracting force between the one end and the magnet of the magnetic core And a repulsive force is generated between the other end and the magnet. Therefore, the movable body can be vibrated only by applying a current in one direction to the coil for a short time.

In the present invention , both end portions of the spring member can be configured to be fixed to support portions supporting respective magnets .

Further, according to the present invention , two spring members are provided across the movable body, and both end portions of each spring member are fixed at a distance in the longitudinal direction, and the movable body is composed of two spring members. It is preferable that it is hold | maintained by the intermediate holding | maintenance part .

In the present invention, since the shape of the spring member is planar, the width of the vibration generator can be reduced. Moreover, since the free length of the wire constituting the spring member can be increased and the spring constant can be reduced, the vibration stroke (amplitude) of the movable body can be increased. As a result, it is possible to increase the amount of work when the movable body vibrates, and it is possible to generate a large tactile vibration in the electronic device.

In the present invention, it is preferable that the first deformation portion and the second deformation portion have the same spring constant.

If the first deformable portion and the second deformable portion are configured by a continuous spring member as in the present invention, it is easy to set the spring constant of the first deformable portion and the spring constant of the second deformable portion to be the same. It becomes easy to hold a movable body in a neutral position.

  In the present invention, the movable body is provided with a yoke plate positioned outside the coil, the yoke plate is connected to both ends of the magnetic core, and the spring member is fixed to the yoke plate. Can be configured.

  By providing the yoke plate, the magnetization of the end portion of the magnetic core can be increased. The yoke plate can also be used as a mounting portion for the spring member.

  In this case, the yoke plate is provided with a bent piece located at the end in the longitudinal direction of the movable body, and the bent piece is preferably a magnetized surface facing the magnet.

  When the bent piece of the yoke plate functions as a magnetized surface facing the magnet, when the coil is energized, the attractive force between the magnetized surface and the magnet and the repulsive force between the magnetized surface and the magnet are increased. Even if the current applied to the coil is small, the vibration energy can be increased and the amplitude of the movable body can be increased.

  In the present invention, the coil is energized with one pulse or two or more pulses in one direction, and the movable body moves in a direction approaching one of the magnets by the magnetization of the magnetic core at this time. It is possible to vibrate.

  In the present invention, since the movable body vibrates in the longitudinal direction, the space required for the vibration of the movable body is reduced, and the vibration generator can be configured in a small size. In addition, since the movable body operates by the attractive force or repulsive force between the magnetization of the end portion of the magnetic core and the magnetic pole of the magnet, the rise time of vibration after the energization is started can be shortened. In addition, since the vibration energy is large, it is possible to generate a vibration with a large amplitude and a good cut of the movable body.

Figure 1 is a perspective view of the vibration generator of the embodiment of the present invention, FIG 2 is an exploded perspective view of the vibration generator, vertical sectional view FIG. 3 showing the main portion of the vibration generating device, FIG. 4 is the vibration It is a schematic diagram explaining the vibration system of a generator.

  As shown in FIGS. 1 and 2, the vibration generator 1 includes a movable body 2, fixed-side facing portions 3 a and 3 b disposed on both sides in the longitudinal direction of the movable body 2, and both fixed-side facing portions 3 a, It has the connection part 7 which connects 3b.

  The fixed-side facing portion 3a on the left side of the figure has a magnet 4a and a support (support plate) 5a that supports the magnet 4a from the outside. The fixed-side facing portion 3b on the right side of the figure shows the magnet 4b and the magnet 4b on the outside. And a support (support plate) 5b. Holding pieces 6a and 6a bent inward are formed on the upper and lower edges of the support 5a, and the magnet 4a is held by the upper and lower holding pieces 6a and 6a. Similarly, holding pieces 6b and 6b are bent at the upper and lower edges of the support 5b, and the magnet 4b is held by the holding pieces 6b and 6b. The support 5a and the support 5b are formed of a magnetic material such as an iron plate.

  The support body 5a and the support body 5b are fixed to both ends of the connecting portion (connecting plate) 7, and the connecting portion 7 and the support bodies 5a and 5b constitute a support frame on the fixed side. The magnet 4a and the magnet 4b are arranged so that the same magnetic pole (for example, S pole) faces each other. Therefore, it is preferable that the connection part 7 is formed with the nonmagnetic metal plate. In addition, the connection part 7 and the support bodies 5a and 5b may be integrally formed in a U shape with a nonmagnetic metal plate or the like.

  The vibration generator 1 is used with the connecting portion 7 fixed to a housing of an electronic device or the like. When the movable body 2 vibrates in the longitudinal direction (the left-right direction in the figure), vibration is applied from the connecting portion 7 to the housing or the like due to the reaction.

  The movable body 2 has a magnetic core 11 made of a magnetic material such as an iron material, and a coil 12 around which a conducting wire is continuously wound around the magnetic core 11. As shown also in FIG. 3, the magnetic core 11 has a flat plate shape in which the width dimension in the paper depth direction (Y direction) is larger than the width dimension in the vertical direction (Z direction), and the longitudinal direction (X direction) which is the left-right direction. ) Is longer than both of the width dimensions. Therefore, the outer shape of the coil 12 wound around the magnetic core 11 has a flat shape in which the width dimension in the vertical direction (Z direction) is smaller than the width dimension in the depth direction on the paper surface (Y direction).

  The movable body 2 is provided with a first yoke plate 13 that covers the upper surface of the coil 12 and both end surfaces in the longitudinal direction, and a second yoke plate 14 that covers the lower surface of the coil 12 and both end surfaces in the longitudinal direction. . Both the first yoke plate 13 and the second yoke plate 14 are magnetic material plates such as iron plates. Bending pieces 13a and 13b are formed at right angles at both ends in the longitudinal direction (X direction) of the first yoke plate 13, and at both ends in the longitudinal direction (X direction) of the second yoke plate 14. The bent pieces 14a and 14b are bent at a right angle.

  As shown in FIG. 3, at the left end of the movable body 2, the lower edge of the bent piece 13 a and the upper edge of the bent piece 14 a are abutted and are in close contact with the left end surface of the magnetic core 11. Similarly, at the right end of the movable body 2, the lower edge of the bent piece 13 b and the upper edge of the bent piece 14 b are abutted and are in close contact with the right end surface of the magnetic core 11. As a result, as shown in FIG. 3, the left end surface of the movable body 2 is provided with a large area magnetized surface 15a formed by the bent piece 13a and the bent piece 14a, and the right end surface of the movable body 2 is A large-area magnetized surface 15b formed by the bent piece 13b and the bent piece 14b is provided. The left end surface 11a of the magnetic core 11 may be exposed on the magnetization surface 15a, or the right end surface 11b of the magnetic core 11 may be exposed on the magnetization surface 15b.

  The magnetized surface 15a has an area equal to or larger than the area of the facing surface of the magnet 4a facing the magnetized surface 15a, and the magnetized surface 15b is equal to or larger than the area of the facing surface of the magnet 4b facing the magnetized surface 15a. Has an area of When the coil 12 is energized, the magnetic core 11 is magnetized, and the left end edge 11a and the right end surface 11b of the magnetic core 11 become different magnetic poles. Is magnetized over a wide area. Therefore, the attractive force acting between the magnetized surface 15a and the magnet 4a and the repulsive force acting between the magnetized surface 15b and the magnet 4b can be increased, and the rise of the vibration of the movable body 2 is accelerated, and the coil 12 The work of vibration (vibration energy) of the movable body can be increased with a small current.

  A first spring member 16 is provided between the upper end of the left support 5a and the upper end of the right support 5b. As shown in FIG. 2, the first spring member 16 is formed of a spring material wire, the left end 16a and the right end 16b are parallel, the left end 16a is fixed to the upper end of the support 5a, The right end portion 16b is fixed to the upper end of the support 5b. The first spring member 16 is formed with alternately curved portions 16c and 16d that are deformed in a U shape in opposite directions. The bending portion 16c and the bending portion 16d are deformed into a U shape within the same plane, and thus the first spring member 16 has a flat shape whose upper and lower thickness dimensions are substantially equal to the diameter of the wire.

  A second spring member 17 is provided between the lower end of the left support 5a and the lower end of the right support 5b. The second spring member 17 has the same shape as the first spring member 16 inverted 180 degrees around the X axis. As for this spring member 17, the left end part 17a is being fixed to the lower end of the support body 5a, and the right end part 17b is being fixed to the lower end of the support body 5b. Further, U-shaped curved portions 17c and 17d that are opposite to each other and are located in the same plane are alternately formed.

  A support portion 13c is provided at the center in the left-right direction of the first yoke plate 13 of the movable body 2, and a U-shaped holding metal fitting 18 is fitted to the support portion 13c from below. A pair of holding pieces 18 a, 18 a are integrally formed on the holding metal fitting 18, and the holding pieces 18 a, 18 a are fitted to the center portion in the left-right direction of the first spring member 16, so that the holding piece 18 a. , 18a, the movable body 2 is held at the center of the first spring member 16. Support portions 14 c are also formed at the left and right central portions of the second yoke plate 14. A U-shaped holding metal fitting 19 is fitted to the support portion 14c from above, and a pair of holding pieces 19a and 19a formed on the holding metal fitting 19 are provided at the left and right central portions of the second spring member 17. Is fitted.

  As a result, as shown in FIG. 1, the central portion in the left-right direction of the movable body 2 is held between the left and right supports 5 a and 5 b by the first spring member 16 and the second spring member 17. ing. The expansion and contraction directions of the first spring 16 and the second spring 17 are parallel to the vibration direction of the movable body 2.

  As shown in FIG. 1, the first spring member 16 has a first deformed portion 16e between the support portion of the support body 5a and the holding portions of the holding pieces 18a and 18a, and is supported by the support body 5b. A portion between the portion and the holding portion by the holding pieces 18a, 18a is a second deforming portion 16f. In the first deformable portion 16e and the second deformable portion 16f, the wire of the first spring member 16 has a shape bent by the curved portion 16c and the curved portion 16d. Can be long. In addition, since the first deformable portion 16e and the second deformable portion 16f are formed by the common spring member 16, the first deformable portion 16e and the second deformable portion 16f have substantially the same spring constant. Can be set.

  The second spring member 17 also has a first deformed portion 17e between the support portion at the support 5a and the holding portion by the holding pieces 19a and 19a, and the support portion at the support 5b and the holding piece 19a. , 19a is the second deforming portion 17f. The first deformable portion 17e and the second deformable portion 17f can also increase the free length of the wire, and the spring constant can be set substantially the same.

  In the first spring member 16 and the second spring member 17, since the curved portions facing each other are alternately formed, the free length of the spring can be increased, and the first deformable portions 16e and 17e and the second deformable portion are formed. The spring constants of the portions 16f and 17f can be set relatively low. Therefore, it becomes easy to drive the movable body 2 so as to increase the amplitude in the longitudinal direction (X direction). Since the movable body 2 can be driven so as to increase its amplitude, the work (energy) of vibration can be increased, and shock vibration can be applied to the housing of the electronic device.

  In this vibration generator 1, the movable body 2 is held by the central portion of the first spring member 16 and the central portion of the second spring member 17, and the left magnet 4 a is moved to the left magnetized surface 15 a of the movable body 2. The right magnet 4 b faces the right magnetized surface 15 b of the movable body 2. The facing distance between the magnet 4a and the magnetized surface 15a and the facing distance between the magnet 4b and the magnetized surface 15b are equal to each other. Further, the magnetic pole of the surface of the magnet 4a facing the magnetized surface 15a and the magnetic pole of the surface of the magnet 4b facing the magnetized surface 15b have the same polarity. Therefore, when the coil 12 is not energized, no attractive force or repulsive force acts on both the magnetized surface 15a and the magnetized surface 15b, and the movable body 2 should be stationary at the neutral position by the magnets 4a and 4b. is there.

  However, in actuality, the movable body 2 does not exist at an accurate neutral position, and the magnetic force of the magnets 4a and 4b varies, so that even when the coil 12 is not energized, the magnetized surface 15a or the magnetized surface A force attracted by a magnet facing the surface 15b acts on one of the surfaces 15b. However, the rigidity of the first spring member 16 and the second spring member is set high with respect to the attractive force acting in the left or right direction with respect to the movable body 2 when the coil 12 is not energized. The movable body 2 can be maintained in the neutral position even if any one of the suction forces is applied.

  When the vibration generator 1 is operated, a current in the direction indicated by reference numeral 20 in FIG. 3 is given to the coil 12 as a pulse, and the magnetic core 11 is magnetized for a short time. The direction of the current is only one direction, the magnetization surface 15a is magnetized to the N pole, and the magnetization surface 15b is magnetized to the S pole. At this time, an attractive force acts between the magnet 4a and the magnetized surface 15a, and a repulsive force acts between the magnet 4b and the magnetized surface 15b. As shown in FIG. A driving force F is applied.

  When one pulse of the current is applied and the driving force F is applied, thereafter, the movable body 2 vibrates in the left-right direction at the natural frequency. When energization of the coil 12 is stopped, the first spring member 16 and the second spring member 17 try to hold the movable body 2 in the neutral position. Stops. In this way, by applying the driving force F to the movable body 2 by energization of one pulse, the rise time until the movable body 2 starts to vibrate after energization is short, and the vibration is also short. Therefore, the vibration generator 1 can generate a shocking and sharp vibration for a short time.

  However, when the vibration is continued for a predetermined time, a current in the direction indicated by reference numeral 20 in FIG. 3 is applied to the coil 12 with a pulse having the same frequency as the natural frequency of the movable body 2, two pulses, three pulses or more. Apply. By such drive control, the movable body 2 can be continuously vibrated for a necessary time. It is also possible to generate intermittent vibration by giving the drive pulse a predetermined number of times in the same cycle as the natural frequency, and then giving a drive pulse a predetermined number of times in the same cycle as the natural frequency after a pause period. is there.

  In addition, since the movable body 2 vibrates in the longitudinal direction, a space required for the movable body 2 to vibrate is small, and the vibration generator 1 can be downsized.

FIG. 4 is a schematic diagram showing a vibration system of the vibration generator 1.
A spring constant by the first deforming portion 16e of the first spring member 16 and the first deforming portion 17e of the second spring member 17 is represented by k1, and the second deforming portion 16f of the first spring member 16 is represented by k1. And the spring constant by the second deforming portion 17f of the second spring member 17 is represented by k2, and the mass of the movable body 2 is represented by W. The spring constant k1 and the spring constant k2 are substantially equal.

  The force with which the left magnet 4a attracts the left magnetized surface 15a of the movable body 2 increases as the magnet 4a approaches the magnetized surface 15a. Therefore, the relationship between the force by which the magnet 4a attracts the magnetized surface 15a and the distance between the magnet 4a and the magnetized surface 15a can be regarded as a negative spring constant -ka. Similarly, the relationship between the force by which the magnet 4b repels the magnetized surface 15b and the distance between the magnet 4b and the magnetized surface 15b can be regarded as a negative spring constant −kb. Therefore, the natural frequency (resonance frequency) of the movable body 2 is the mass W of the movable body 2, the spring constant (k1-ka) between the movable body 2 and the left support body 5a, and the movable body 2 and the right side. It is determined by the spring constant (k2-kb) between the support 5b.

  In this vibration generator 1, when the coil 12 is energized when the movable body 2 is in the neutral position, the magnetized surface 15a becomes the N pole, and an attractive force F is generated between the magnetized surface 15a and the magnet 4a, Moreover, as the magnetized surface 15a approaches the magnet 4a, the leftward force acting on the movable body 2 increases. A repulsive force between the S poles acts between the right magnetized surface 15b and the magnet 4b. Therefore, when the driving force F acts on the movable body 2, the movable body 2 moves quickly in the left direction. Therefore, it is possible to generate a vibration with a large amplitude for the movable body 2 by energizing the coil 12 with one pulse.

Perspective view of the vibration generator of the embodiment of the present invention, Exploded perspective view of the vibration generator of the embodiment, The longitudinal cross-sectional view which shows the principal part of the vibration generator of embodiment, Schematic diagram illustrating a vibration system of the vibration generator of the embodiment,

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vibration generator 2 Movable body 3a, 3b Fixed side opposing part 4a, 4b Magnet 5a, 5b Support body 7 Connection part 11 Magnetic core 12 Coil 13 1st yoke board 14 2nd yoke board 15a, 15b Magnetization surface 16 1st 1 spring member 17 2nd spring member 18, 19

Claims (8)

In a vibration generator including a movable body having a magnetic core and a coil wound around the magnetic core, a spring member supporting the movable body, and a magnet facing the movable body,
2 the magnetic core is greater than the widthwise dimension longitudinal dimension is the direction perpendicular to the longitudinal direction is a winding direction along the center line of the coil, the magnet is oriented in the longitudinal direction of the magnetic core Facing the same magnetic pole to each of the two end faces ,
The spring member is formed by bending a wire such that curved portions that are curved in opposite directions toward the width direction are alternately repeated toward the longitudinal direction,
Both end portions of the spring member are fixed at a distance in the longitudinal direction, and the movable body is held by an intermediate holding portion of the spring member, and the spring member is between one end portion and the holding portion. Is a first deformed portion having the curved portions that are opposite to each other, and a portion between the other end and the holding portion is a second deformed portion having the curved portions that are opposite to each other.
When no power is supplied to the coil, the movable body is, by the spring member, the end faces of the magnetic core is held in the neutral position away from the respective magnets, when energizing the coil, magnetized movable One of the first deformable portion and the second deformable portion is extended by the magnetic force of the body and the magnet, and the other is contracted, and the movable body is vibrated in the longitudinal direction. . Two spring members are provided on both sides of the movable body, and both end portions of each of the spring members are fixed at a distance in the longitudinal direction, and the movable body is an intermediate holding portion between the two spring members. The vibration generator according to claim 1, wherein the vibration generator is held. The vibration generating device according to claim 1, wherein both end portions of the spring member are fixed to support portions that support the respective magnets. The vibration generator according to any one of claims 1 to 3, wherein the first deformable portion and the second deformable portion have the same spring constant . A holding piece is provided on the movable body, the holding piece is fitted between two wire members extending from one curved portion in the middle of the spring member, and the movable body is held by the spring member. The vibration generator according to any one of claims 1 to 4 . Wherein the movable body, and the yoke plate is provided located outside of the coil, the yoke plate is connected to both ends of the magnetic core, a portion of the yoke plate is held by the spring member The vibration generator according to any one of claims 1 to 5 . The vibration generating device according to claim 6 , wherein the yoke plate is provided with a bent piece positioned at an end in a longitudinal direction of the movable body, and the bent piece is a magnetized surface facing the magnet. The coil is energized with one or more pulses of current only in one direction, and the movable body moves in a direction approaching one of the magnets due to the magnetization of the magnetic core at this time. The vibration generator according to any one of claims 1 to 7 , which vibrates at a frequency.

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