JP2010239851A - Vibration motor and portable apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration motor which can be made thinner and has high design flexibility of elastic members. <P>SOLUTION: A vibration motor 1 includes a movable section 2 including a magnet, a tubular yoke and yokes for side faces, and a housing 5 including a coil substrate 3, a spring 4 with plate, an upper housing 5a, and a lower housing 5b. The spring 4 with plate is arranged between the housing 5 and the tubular yoke. The tubular yoke is provided in the direction of side surface of the magnet, and faces the magnet and the coil substrate 3. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vibration motor and a portable device including the vibration motor.

  In recent years, due to miniaturization of portable devices such as PDAs and mobile phones, miniaturization of devices for vibrating portable devices is also required. Such a device has a problem of a decrease in vibration amount as it is miniaturized. As a device for vibrating a portable device, a vibration motor having a movable part that vibrates by a magnetic field generated by a coil is generally used.

  As a conventional vibration motor, Patent Document 1 discloses a configuration of a vibration actuator.

  The vibration actuator described in Patent Document 1 includes a fixed part, a movable part composed of a magnet and a yoke, an M-shaped elastic member that movably holds the movable part with respect to the fixed part, and a magnetic flux of the magnet. And a coil that interlinks with each other, and when a current is passed through the coil, the movable part linearly moves in the lateral direction (direction perpendicular to the thickness direction of the movable part).

With the above configuration, a worn portion can be eliminated as compared with a conventional vibration actuator using a brushed motor. Therefore, generation of noise can be suppressed, and a vibration actuator with high operation reliability can be provided.
JP 2002-200460 A (publication date: July 16, 2002)

  However, in the vibration actuator described in Patent Document 1, the elastic member can be disposed only on the side surface of the magnet or yoke of the movable portion, and cannot be disposed in the region where the coil is inserted. Therefore, the degree of freedom in design of the elastic member is low, and the movement of the movable part cannot be efficiently received by the elastic member, so that it is difficult to obtain a sufficient amount of vibration.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a vibration motor and a portable device that can be thinned and have a high degree of freedom in designing an elastic member. is there.

  In order to solve the above problems, the vibration motor of the present invention includes a fixed portion, a magnet and a support member provided in a side surface direction of the magnet, and a movable portion that moves relative to the fixed portion; A coil disposed opposite to the magnet for moving the movable part in a direction in which the support member is provided, and an elastic member provided between the fixed part and the support member, The support member faces the magnet and the coil.

  The portable device of the present invention is characterized by including the above-described vibration motor.

  With the above configuration, the vibration motor of the present invention can be thinned and can increase the degree of freedom in designing the elastic member.

  Moreover, since the portable device of the present invention is equipped with the vibration motor, it is possible to reduce the thickness and increase the amount of vibration.

It is a disassembled perspective view for demonstrating the structure of the vibration motor which concerns on 1st Embodiment of this invention. It is a disassembled perspective view for demonstrating the structure of the movable part of the said vibration motor. (A) is a top view for demonstrating the internal structure of the said vibration motor, (b) is AA 'sectional drawing of (a), (c) is BB' cross section of (a). FIG. (A) is a top view of the planar coil formed in the upper layer of the coil board | substrate of the said vibration motor, (b) is a top view of the planar coil formed in the lower layer of the said coil board | substrate, (c) is the said It is XX 'sectional drawing of a coil board | substrate. (A) is a top view for demonstrating the structure of the spring with a plate of the said vibration motor, (b) is sectional drawing of (a), (c) looked at (a) from the direction of the arrow. It is a front view. (A)-(c) is sectional drawing for demonstrating the drive method of the said vibration motor. It is a modification of a spring with a plate. It is the other modification of a spring with a plate. It is the other modification of a spring with a plate. (A) is a figure which shows the magnetic flux in case the bottom face of a magnet has an area substantially the same as the bottom face of the inner wall of a cylindrical yoke, (b) is a figure where the bottom face of a magnet has an area smaller than the bottom face of the inner wall of a cylindrical yoke. It is a figure which shows the magnetic flux in a case. It is a disassembled perspective view for demonstrating the structure of the movable part of the vibration motor which concerns on 2nd Embodiment of this invention. (A)-(c) is sectional drawing for demonstrating the drive method of the said vibration motor. (A), (b) is sectional drawing for demonstrating the internal structure of the vibration motor which concerns on 3rd Embodiment of this invention. (A) is a top view of the planar coil formed in the upper layer of the coil board | substrate of the said vibration motor, (b) is a top view of the planar coil formed in the lower layer of the said coil board | substrate, (c) is the said It is XX 'sectional drawing of a coil board | substrate. (A)-(c) is sectional drawing for demonstrating the drive method of the said vibration motor. It is a disassembled perspective view for demonstrating the structure of the vibration motor which concerns on 4th Embodiment of this invention. (A) is a top view for demonstrating the internal structure of the vibration motor which concerns on 5th Embodiment of this invention, (b) is AA 'sectional drawing of (a), (c) is ( It is BB 'sectional drawing of a). (A) is a top view of the planar coil formed in the upper layer of the coil board | substrate of the said vibration motor, (b) is a top view of the planar coil formed in the lower layer of the said coil board | substrate. (A) is a top view for demonstrating the internal structure of the vibration motor which concerns on 6th Embodiment of this invention, (b) is AA 'sectional drawing of (a), (c) is ( It is BB 'sectional drawing of a). (A) is a top view of the planar coil formed in the upper layer of the coil board | substrate of the said vibration motor, (b) is a top view of the planar coil formed in the lower layer of the said coil board | substrate. It is a disassembled perspective view for demonstrating the structure of the movable part of the vibration motor which concerns on 7th Embodiment of this invention. It is a top view for demonstrating the mobile telephone which concerns on this invention. It is X-X 'sectional drawing of the said mobile telephone.

[Vibration motor]
(First embodiment)
The configuration of the vibration motor 1 according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an exploded perspective view for explaining the configuration of the vibration motor 1.

  The vibration motor 1 includes a movable portion 2, a coil substrate 3, a spring 4 with a plate, an upper housing 5a, and a lower housing 5b. The upper casing 5a and the lower casing 5b form a rectangular parallelepiped casing 5 by being combined so as to close each other's opening. A movable part 2, a coil substrate 3, and a dished spring 4 are accommodated inside the housing 5. The vibration motor 1 is configured to cause the movable part 2 to reciprocate in the casing 5 by passing an electric current through the coil substrate 3, and to vibrate by receiving the movement of the movable part 2 by the countersunk spring 4 and the casing 5. .

  FIG. 2 is an exploded perspective view for explaining the configuration of the movable portion 2. The movable part 2 includes a magnet 6, a cylindrical yoke 7, and a side yoke 8. The cylindrical yoke 7 and the side yoke 8 having a function as a magnetic shield cover the magnet 6, thereby preventing the magnetic flux of the magnet 6 from leaking outside the movable portion 2.

  The magnet 6 is a rectangular parallelepiped member made of a magnetic material, and includes two regions 61 and 62 having a pair of magnetic poles in the thickness direction, and a neutral region 63 made of a magnetic material between the regions 61 and 62. Including. Here, in the regions 61 and 62, the magnetic poles are opposite to each other.

  The magnet 6 may be formed by magnetizing a single magnetic material so as to include the regions 61 and 62 and the neutral region 63, or a magnet that is not magnetized between the two magnets. You may form by adhering on both sides of material.

  The cylindrical yoke 7 is a rectangular parallelepiped member made of a material having a small coercive force and a large magnetic permeability, and a hollow is formed in the longitudinal direction thereof. As the material constituting the cylindrical yoke 7, permalloy, carbon steel, ordinary steel, silicon steel, ferritic stainless steel, permendur, martensitic stainless steel, precipitation hardening stainless steel and the like are suitable. Thus, since the cylindrical yoke 7 is made of a material having a high magnetic permeability, it is possible to confine more surrounding magnetic flux lines.

  The bottom surface of the magnet 6 and the bottom surface of the inner wall of the cylindrical yoke 7 have substantially the same area. Due to the magnetic attraction acting between the magnet 6 and the cylindrical yoke 7, the magnet 6 becomes the bottom surface of the inner wall of the cylindrical yoke 7. It is fixed to. At this time, the magnet 6 is fixed to the cylindrical yoke 7 so that the regions 61 and 62 and the neutral region 63 of the magnet 6 extend in a direction perpendicular to the opening surface of the cylindrical yoke 7. In addition, in order to strengthen fixation between the magnet 6 and the cylindrical yoke 7, you may make it adhere | attach using an adhesive agent.

  The side yoke 8 is made of the same material as that of the cylindrical yoke 7, and includes a side region 8 a disposed so as to close a portion where the magnet 6 is provided in both opening surfaces of the cylindrical yoke 7. And a bottom surface region 8b disposed so as to cover the bottom surface of the outer wall of the cylindrical yoke 7. The height of the side surface region 8 a is formed below the upper end of the side surface of the magnet 6 so as not to contact the coil substrate 3 due to the movement of the movable portion 2. The side yoke 8, the magnet 6 and the cylindrical yoke 7 are fixed using an adhesive.

3A is a top view for explaining the internal structure of the vibration motor 1, FIG. 3B is a cross-sectional view taken along the line AA ′ of FIG. 3A, and FIG. It is BB 'sectional drawing of 3 (a). The coil substrate 3 is a rectangular substrate and is inserted from the opening surface of the cylindrical yoke 7 along the longitudinal direction of the coil substrate 3. Both ends on the short side of the coil substrate 3 are the upper casing 5a and the lower casing 5.
The coil substrate 3 is fixed to the housing 5 by being sandwiched between b. The coil substrate 3 and the magnetic pole surface of the magnet 6 are arranged so as to be parallel inside the cylindrical yoke 7. Here, the term “parallel” includes not only a state parallel to each other but also a state deviated from a parallel state to the extent that the movable portion 2 does not interfere with the reciprocating movement.

  4A is a top view of the planar coil 9 formed in the upper layer of the coil substrate 3, and FIG. 4B is a top view of the planar coil 9 formed in the lower layer of the coil substrate 3. (C) is a cross-sectional view of the coil substrate 3 taken along the line XX ′. The planar coil 9 is formed in a two-layered spiral shape inside the coil substrate 3.

  Specifically, as shown in FIG. 4C, the coil substrate 3 has a four-layer structure, and coil layers 3b and 3c in which the planar coil 9 is embedded, and insulating layers provided on both surfaces thereof. 3a and 3d. The insulating layers 3a and 3d insulate the planar coil 9 provided on the coil layers 3b and 3c from the outside. The planar coil 9 includes an upper layer coil 91 wound counterclockwise in a substantially rectangular shape from the electrode pad 10a toward the center portion of the coil substrate 3 in the coil layer 3a, and a center portion of the coil substrate 3 in the coil layer 3b. And a lower coil 92 wound in a substantially rectangular shape counterclockwise from the electrode pad 10b toward the electrode pad 10b. The upper coil 91 and the lower coil 92 of the planar coil 9 are connected at the center of the coil substrate 3.

  Further, as shown in FIGS. 4A and 4B, the planar coil 9 has regions 9A and 9B including a plurality of coil wires extending in the longitudinal direction of the coil substrate 3 in the coil layers 3b and 3c. Each region is formed so that current flows in the same direction. Further, both ends of the planar coil 9 are connected to a drive current supply circuit (not shown) via electrode pads 10a and 10b, and current is supplied from the drive current supply circuit in the direction of arrow A or B. The drive current supply circuit switches the direction of the current supplied to the planar coil 9 at a predetermined cycle.

  FIG. 5A is a top view for explaining the configuration of the plate spring 4, FIG. 5B is a cross-sectional view of FIG. 5A, and FIG. 5C is FIG. It is the front view which looked at from the direction of the arrow. The dished spring 4 is made of a nonmagnetic material, and two plate springs 4a and 4b and a tray 4c are integrally formed. The plate-attached spring 4 mounts the movable portion 2 on the tray 4c, supports both side surfaces in the moving direction of the movable portion 2 with plate springs 4a and 4b, and receives the movement of the movable portion 2. SUS301, 304 etc. are suitable as a material which comprises the spring 4 with a plate.

  The two leaf springs 4 a and 4 b include fixed portions 4 d and 4 e that are fixed to the lower housing 5 b and support portions 4 f and 4 g that support the movable portion 2. The support portions 4f and 4g have one bending point 4X and 4Y between the lower housing 5b and the movable portion 2 in order to catch the movement of the movable portion 2. Further, as shown in FIG. 5 (b), the support portions 4 f and 4 g are arranged so as to be positioned on the moving direction including the center of gravity A of the movable portion 2, and the height thereof is the height of the movable portion 2. Designed to suit.

  On the other hand, the height of the upper ends of the fixing portions 4d and 4e is lower than the height of the upper ends of the support portions 4f and 4g, as shown in FIG. This is because, when the coil substrate 3 is disposed, if the heights of the upper ends of the fixing portions 4d and 4e are the same as the supporting portions 4f and 4g, the fixing portions 4d and 4e and the coil substrate 3 come into contact with each other. Because. Therefore, the fixing portions 4 d and 4 e are designed to have a height that does not contact the coil substrate 3.

In addition, the lower ends of the tray 4c and the support portions 4f and 4g are fixed to the fixed portions 4d and 4e so that the tray 4c and the support portions 4f and 4g do not contact the bottom surface of the inner wall of the lower housing 5b as the movable portion 2 moves. It is comprised so that it may come to a position higher than a lower end. That is, the countersunk spring 4 has a lower housing 5b.
The movable part 2 is held in a state where it floats from the bottom surface of the inner wall. Moreover, since the movable part 2 is mounted, the saucer 4c has substantially the same shape as the bottom surface of the movable part 2.

  In the assembly stage of the vibration motor 1, the tray-attached spring 4 is divided into two trays 4 c, a plate spring 4 a is connected to one tray 4 c, and a plate spring 4 b is connected to the other tray 4 c. Yes. Each component constitutes a plate spring 4 with a plate by being fixed to the bottom surface of the movable portion 2.

  Next, a method for driving the vibration motor 1 will be described with reference to FIG. 6A to 6C are cross-sectional views for explaining a driving method of the vibration motor 1. Here, a case where the movable part 2 is first moved in the X1 direction will be described.

  When the vibration motor 1 is driven, a current is supplied to the planar coil 9 of the coil substrate 3 from the drive current supply circuit through the electrode pad 10a in the direction A shown in FIG. As a result, a current flows in the area 9A of the planar coil 9 from the back side to the front side, that is, in the Z2 direction along the longitudinal direction of the coil substrate 3 as shown in FIG. 6A. Further, in the region 9B of the planar coil 9, a current flows from the front side to the back side, that is, the Z1 direction along the longitudinal direction of the coil substrate 3.

  Here, the direction of the magnetic field generated between the N-pole surface 6A and the S-pole surface 6B of the surface of the magnet 6 facing the coil substrate 3 is the same as the coil on the N-pole surface 6A from the surface of the N-pole surface 6A. The direction is toward the substrate 3, that is, the Y1 direction. On the south pole surface 6B, the direction is from the coil substrate 3 toward the south pole surface 6B, that is, the Y2 direction. Thus, the magnetic field generated between the N-pole surface 6A and the S-pole surface 6B of the magnet 6 is orthogonal to the direction of current flow in the regions 9A and 9B of the planar coil 9.

  Therefore, the current flowing through the region 9A of the planar coil 9 receives a force in the X2 direction from the magnetic field on the N-pole surface 6A of the magnet 6. Further, the current flowing through the region 9B of the planar coil 9 receives a force in the X2 direction from the magnetic field on the south pole surface 6B of the magnet 6. That is, a force in the X2 direction acts on the coil substrate 3.

  However, since the coil substrate 3 is fixed by the upper housing 5a and the lower housing 5b, the magnet 6 receives a force in the X1 direction by reaction. Therefore, the movable part 2 moves in the X1 direction as shown in FIG. At this time, since the movable portion 2 is supported by the leaf spring 4b of the disc spring 4 in the X1 direction, the leaf spring 4b bends and receives the movement of the movable portion 2.

  Next, the drive current supply circuit switches the direction of the current supplied to the planar coil 9 to the B direction shown in FIG. Thereby, in the area 9A of the planar coil 9, a current flows from the front side to the back side, that is, the Z1 direction along the longitudinal direction of the coil substrate 3 as shown in FIG. 6C. Further, a current flows in the region 9B of the planar coil 9 from the back side to the front side, that is, the Z2 direction along the longitudinal direction of the coil substrate 3.

  Therefore, the current flowing through the region 9A of the planar coil 9 receives a force in the X1 direction from the magnetic field on the N-pole surface 6A of the magnet 6. Further, the current flowing through the region 9B of the planar coil 9 receives a force in the X1 direction from the magnetic field on the south pole surface 6B of the magnet 6. Thereby, the movable part 2 moves in the X2 direction as shown in FIG. At this time, since the movable portion 2 is supported by the plate spring 4a of the disc spring 4 in the X2 direction, the plate spring 4a is bent and receives the movement of the movable portion 2.

As described above, the vibration motor 1 reciprocates the movable portion 2 in the X1 direction and the X2 direction by switching the direction of the current supplied to the planar coil 9 by the drive current supply circuit. At this time, by adjusting the timing at which the drive current supply circuit supplies current to the planar coil 9, the movable portion 2 can resonate and a large amount of vibration can be obtained.

  If the N pole surface 6A of the magnet 6 overlaps the region 9B of the planar coil 9 when the movable part 2 is moved to the maximum in the X1 direction, the current flowing through the region 9B is a magnetic field on the N pole surface 6A. The force in the X1 direction is applied to the magnet 6, and the force in the X2 direction acts on the magnet 6. That is, a force acts in a direction opposite to the direction in which the movable part 2 tries to move, and the vibration amount of the vibration motor 1 decreases.

  Therefore, the magnet 6 has a width of the neutral region 63 so that the N pole surface 6A of the magnet 6 does not overlap the region 9B of the planar coil 9 when the movable part 2 is moved to the maximum in the X1 direction. It has been adjusted. Since the neutral region 63 is not magnetized, the force for moving the magnet 6 in the X2 direction does not act even if it is opposed to the region 9B. Similarly, when the movable part 2 is moved to the maximum in the X2 direction, the neutral region 63 of the magnet 6 has a width so that the S pole surface 6B of the magnet 6 and the region 9A of the planar coil 9 do not overlap. It has been adjusted. Therefore, the width of the neutral region 63 is determined by the relationship between the magnet 6 and the planar coil 9.

  Below, the effect of the vibration motor 1 of this embodiment is demonstrated.

  (1) The vibration motor 1 moves the movable part 2 along the coil substrate 3. Thereby, it is not necessary to provide the movement space of the movable part 2 in the thickness direction, and the entire apparatus can be thinned.

  (2) In the vibration motor 1, the leaf springs 4 a and 4 b are provided on the side surface of the cylindrical yoke 7 in the moving direction. Accordingly, the leaf springs 4a and 4b can be arranged without worrying about the portion where the coil substrate 3 is inserted, and the degree of freedom in design can be improved. That is, the installation positions of the leaf springs 4a and 4b can be freely set, and the leaf springs 4a and 4b having a sufficient height can be used. Therefore, the vibration motor 1 can efficiently receive the movement of the movable portion 2 and can increase the amount of vibration.

  (3) The vibration motor 1 is disposed such that the leaf springs 4 a and 4 b are positioned on the moving direction including the center of gravity A of the movable portion 2. Thereby, since the leaf | plate springs 4a and 4b can receive the movement of the movable part 2 efficiently, the vibration amount of the vibration motor 1 can be increased.

  (4) In the vibration motor 1, the cylindrical yoke 7 has a function as a magnetic shield. Thereby, since the magnetic flux generated by the magnet 6 passes through the cylindrical yoke 7, the magnetic path can be shortened as compared with the case where the cylindrical yoke 7 is not provided. Therefore, the magnetic force acting on the planar coil 9 is increased, and the amount of vibration of the vibration motor 1 can be increased.

  (5) The vibration motor 1 is disposed so as to block a portion where the magnet 6 is provided in both opening surfaces of the cylindrical yoke 7 and is disposed so as to cover the bottom surface of the outer wall of the cylindrical yoke 7. A yoke 8 is provided. As a result, a magnetic flux is formed between the N-pole surface 6A and the S-pole surface 6B of the magnet 6 and the end portion of the side yoke 8, so that compared to the case where the side yoke 8 is not provided, The magnetic path can be shortened. Therefore, the magnetic force acting on the planar coil 9 is increased, and the amount of vibration of the vibration motor 1 can be increased.

  (6) In the vibration motor 1, the cylindrical yoke 7 and the side yoke 8 cover portions of the magnet 6 other than the surface facing the coil substrate 3. Thereby, since it can suppress that the magnetic flux which the magnet 6 produces leaks outside the movable part 2, the operating efficiency of the vibration motor 1 can be improved and the amount of vibrations can be increased.

  (7) The magnet 6 of the vibration motor 1 is formed so as to include two regions 61 and 62 having a pair of magnetic poles in the thickness direction, and a neutral region 63 made of a magnetic material between the regions 61 and 62. In the regions 61 and 62, the magnetic poles are opposite to each other. Thereby, since the downward magnetic flux which the magnet 6 produces can be reduced, the magnetic flux leakage to the downward direction in the vibration motor 1 can be suppressed. As a result, the operating efficiency of the vibration motor 1 can be increased, and the amount of vibration can be increased.

  (8) The neutral region 63 of the magnet 6 is designed so that the region 9B of the planar coil 9 and the N pole surface 6A of the magnet 6 do not overlap when the magnet 6 is moved to the maximum in the X1 direction. When the magnet 6 is moved to the maximum in the X2 direction, the region 9A of the planar coil 9 and the south pole surface 6B of the magnet 6 are designed not to overlap each other. Thereby, when the movable part 2 is moved to the maximum in the X1 and X2 directions, it is possible to prevent a force from acting in the direction opposite to the direction in which the movable part 2 is about to move. Therefore, the vibration amount of the vibration motor 1 can be increased.

  (9) The dished spring 4 of the vibration motor 1 is configured such that the lower ends of the tray 4c and the support portions 4f and 4g are positioned higher than the lower ends of the fixed portions 4d and 4e. Accordingly, since the movable portion 2 is held in a state of floating from the inner wall bottom surface of the lower housing 5b, when the movable portion 2 moves, the movable portion 2 is interposed between the tray 4c and the inner wall bottom surface of the lower housing 5b. Friction can be prevented from occurring. Therefore, since the movable part 2 can be moved efficiently, the vibration amount of the vibration motor 1 can be increased.

  As described above, the configuration of the vibration motor 1 of the present embodiment has been described. However, the vibration motor of the present invention is not limited to the above-described configuration, and various modifications are possible within the scope of the claims. is there. Below, the modification of the vibration motor 1 and its effect are demonstrated.

  (A) In this embodiment, the cylindrical yoke 7 is used as the “support member” of the present invention, but the present invention is not limited to this. That is, the “supporting member” of the present invention is provided in the side surface direction of the magnet 6, as long as it faces the magnet 6 and the coil substrate 3.

  (A) In the present embodiment, the planar coil 9 is used as the “coil” of the present invention, but the present invention is not limited to the planar coil, and a coil having a thickness in the thickness direction may be used.

  (C) In the present embodiment, the leaf springs 4a and 4b are used as the “elastic member” of the present invention. However, the present invention is not limited to the leaf spring, and an elastic member having another configuration such as a torsion spring may be used. However, whatever size elastic member is used, the size is preferably close to the height of the movable portion 2 in order to increase the spring constant.

  (D) In this embodiment, the leaf springs 4a and 4b are arranged so as to be positioned on the moving direction including the center of gravity A of the movable part 2. However, the movable part 2 is not necessarily on the moving direction including the center of gravity A. As long as it is provided in the moving direction. Further, in the present embodiment, the leaf springs are provided on both side surfaces in the moving direction of the movable part 2, but a configuration in which the leaf springs are provided only on one side surface in the moving direction of the movable part 2 may be employed. In addition, two or more leaf springs may be provided on both side surfaces in the moving direction of the movable portion 2.

  (E) In this embodiment, the plate spring 4 is formed integrally with the plate springs 4a, 4b and the tray 4c, but may have a configuration in which the tray 4c is not provided.

  (F) In the present embodiment, the countersunk spring 4 is made of a nonmagnetic material, but may be made of a magnetic material. In this case, since the countersunk spring 4 has a function as a magnetic shield, the magnetic flux generated by the magnet 6 can be further prevented from leaking out of the vibration motor 1. Therefore, it is possible to increase the operation efficiency of the vibration motor 1 and increase the vibration amount.

  (G) In the present embodiment, in the assembly stage of the vibration motor 1, the tray spring 4 is divided into two trays 4c. One plate 4c has a plate spring 4a and the other tray 4c has a plate. Although the spring 4b is connected, the present invention is not limited to this. In other words, the plate spring 4 with a plate may be one that has already been integrated in the assembly stage of the vibration motor 1.

  (H) In this embodiment, nothing is provided on the surface of the coil substrate 3 facing the magnet 6, but a low friction layer having a friction coefficient lower than the friction coefficient of the surface of the coil substrate 3 is formed. Also good. Thereby, when the movable part 2 moves, the loss of energy due to the friction between the coil substrate 3 and the magnet 6 can be suppressed. Therefore, the movable part 2 can be moved efficiently, and the vibration amount of the vibration motor 1 can be increased.

  (K) In this embodiment, the movable part 2 has a configuration in which the magnet 6 is fixed to the bottom surface of the inner wall of the cylindrical yoke 7, but the present invention is not limited to this. That is, the movable portion 2 may have a configuration in which the magnet 6 is mounted on the side yoke 8 and the side yoke 8 is fixed to the bottom of the inner wall of the cylindrical yoke 7. Moreover, the lower end of the cylindrical yoke 7 may protrude from the opening surface, and the side surface of the magnet 6 may be covered by being bent. In this case, since it is not necessary to provide the side yoke 8, the number of parts can be reduced, and the entire apparatus can be thinned.

  (E) In this embodiment, the height of the side region 8a of the side yoke 8 is formed below the upper end of the side surface of the magnet 6, but the present invention is not limited to this.

  For example, when it is not necessary to reduce the thickness of the vibration motor 1, it is preferable that the height of the side surface region 8 a is configured to protrude from the upper end of the side surface of the magnet 6. If it is not necessary to make the vibration motor 1 thin, it is possible to prevent the coil substrate 3 and the side surface region 8a from coming into contact with each other even when the side surface region 8a is increased. Furthermore, it is possible to further suppress leakage of the magnetic flux generated by the magnet 6 to the outside of the movable portion 2 by increasing the side surface region 8a.

  Further, when it is desired to further increase the vibration amount of the vibration motor 1 as compared with the present embodiment, it is preferable that the height of the side surface region 8 a is substantially the same as the upper end of the side surface of the magnet 6. Thereby, the magnetic path of the magnetic flux formed between the N pole surface 6A and the S pole surface 6B of the magnet 6 and the end of the side yoke 8 can be made the shortest. Therefore, the magnetic force acting on the planar coil 9 is further increased, and the vibration amount of the vibration motor 1 can be increased.

  (S) In this embodiment, the side yoke 8 is made of the same material as that of the cylindrical yoke 7, but a different material may be used. In this case, since the side yoke 8 is farther away from the magnet 6 than the cylindrical yoke 7, a material having a high magnetic permeability even in a low magnetic field, such as permalloy, is preferably used.

  (F) In this embodiment, when the positional relationship between the magnet 6 and the planar coil 9 is moved to the maximum in the X1 direction, the region 9B of the planar coil 9 and the N pole surface 6A of the magnet 6 are It is designed not to overlap, and when the magnet 6 is moved to the maximum in the X2 direction, it is designed so that the region 9A of the planar coil 9 and the south pole surface 6B of the magnet 6 do not overlap. The invention is not limited to this.

  For example, the positional relationship between the magnet 6 and the planar coil 9 is such that when the magnet 6 is moved to the maximum in the X1 direction, the region 9B and the S pole surface 6B are larger than the area where the region 9B and the N pole surface 6A overlap. Are designed to be larger, and when the magnet 6 is moved to the maximum in the X2 direction, the areas 9A and N are larger than the area where the area 9A and the S pole face 6B overlap. You may design so that the area where 6 A of pole surfaces overlap may become larger.

  Thereby, even when the movable part 2 is moved to the maximum in the X1 and X2 directions, the force acting in the direction in which the movable part 2 is about to move is made larger than the force acting in the opposite direction. Can do.

  In the present embodiment, the positional relationship between the magnet 6 and the planar coil 9 is adjusted by adjusting the width of the neutral region 63 of the magnet 6. This may be performed by adjusting the elastic force, the distance between the region 9A and the region 9B of the planar coil 9, the length of the tubular yoke 7 in the short direction, and the like.

  (S) The configuration of the leaf springs 4a and 4b of the disc-attached spring 4 can be changed to various configurations as shown in FIGS. 7-9 is a top view for demonstrating the modification of the spring 4 with a plate.

Instead of the leaf springs 4a and 4b, the countersunk spring 4 is further provided between the first fixing portions 403 and 404 fixed to the lower housing 5b and the support portions 405 and 406, as shown in FIG. Leaf springs 401 and 402 formed with second fixing portions 407 and 408 fixed to the lower housing 5b may be used. The second fixing portions 407 and 408 are not necessarily fixed to the lower housing 5b, and may be bent between the second fixing portions 407 and 408 and the support portions 405 and 406. Good.

  Further, as shown in FIG. 8, the plate-attached spring 4 has a shape similar to the plate springs 4 a and 4 b inside the plate springs 4 a and 4 b and does not have a joint portion with the receiving plate 4 c. May be provided.

  As shown in FIG. 9, the plate spring 4 has a shape similar to the plate springs 401 and 402 inside the plate springs 401 and 402 shown in FIG. 7, and does not have a joint portion with the tray 4c. The structure provided with the springs 411 and 412 may be sufficient.

  In FIG. 8, the leaf springs 409 and 410 may be provided outside the leaf springs 4a and 4b. In FIG. 9, the leaf springs 411 and 412 may be provided outside the leaf springs 401 and 402. Good.

  As described above, the spring constant can be increased without increasing the thickness of the leaf spring by adopting a configuration having two fixing portions or by overlapping two leaf springs. As a result, the resonance frequency can be increased without lowering the fatigue resistance of the leaf spring, so that the vibration amount of the vibration motor 1 can be increased.

  (C) In this embodiment, the bottom surface of the magnet 6 has substantially the same area as the bottom surface of the inner wall of the cylindrical yoke 7, but the present invention is not limited to this, and the bottom surface of the magnet 6 is the same as that of the cylindrical yoke 7. It is good also as a structure which has an area smaller than an inner wall bottom face. FIG. 10A is a diagram illustrating magnetic flux when the bottom surface of the magnet 6 has substantially the same area as the bottom surface of the inner wall of the cylindrical yoke 7, and FIG. It is a figure which shows a magnetic flux in case it has an area smaller than an inner wall bottom face. As shown in FIGS. 10A and 10B, by reducing the area of the bottom surface of the magnet 6, the magnetic path of the magnetic flux generated by the magnet 6 can be shortened.

  Thereby, the magnetic force which acts on the planar coil 9 becomes large, and the vibration amount of the vibration motor 1 can be increased. Further, by reducing the area of the bottom surface of the magnet 6, the distance between the magnet 6 and the side surfaces of the upper housing 5 a and the lower housing 5 b is increased, so that the amount of magnetic flux leaking to the outside of the vibration motor 1 is reduced. Can be reduced.

  Further, with the above configuration, a gap is formed between the side surface of the magnet 6 and the inner wall side surface of the cylindrical yoke 7. Therefore, when heat is applied from the outside when the vibration motor 1 is manufactured, the magnet 6 is compared with the case where the cylindrical yoke 7 made of a magnetic material having high thermal conductivity and the magnet 6 are in contact with each other. Heat transmission can be suppressed. Since the magnetic force of the magnet 6 decreases when heat is applied, the above configuration can suppress thermal demagnetization of the magnet 6.

  In addition, with the above configuration, the air between the side surface of the magnet 6 and the inner wall side surface of the cylindrical yoke 7 can be made to flow by moving the movable portion 2. Therefore, the heat generated by passing a current through the planar coil 9 is efficiently radiated to the outside of the cylindrical yoke 7. As a result, it is possible to prevent the heat of the planar coil 9 from being transmitted to the magnet 6 and the magnetic force of the magnet 6 from being reduced. At this time, by increasing the height of the cylindrical yoke 7, the amount of air flowing inside the cylindrical yoke 7 can be increased, and heat can be radiated more efficiently.

  Further, with the above configuration, the magnetic flux of the magnet 6 can be prevented from entering the cylindrical yoke 7 before penetrating the planar coil 9. Therefore, the magnetic force acting on the planar coil 9 is increased, and the amount of vibration of the vibration motor 1 can be increased.

  Since the area of the bottom surface of the magnet 6 is related to the force that moves the magnet 6, it is necessary to determine an optimum value from the relationship between the magnitude of magnetic flux leakage of the magnet 6 and the force that moves it.

(Second Embodiment)
Next, the configuration of the vibration motor 21 according to the second embodiment of the present invention will be described. The vibration motor 21 includes a movable portion 22, a coil substrate 3, a spring 4 with a plate, an upper housing 5a, and a lower housing 5b. That is, the vibration motor 21 is different in the configuration of the movable part from the vibration motor 1 of the first embodiment.

  FIG. 11 is an exploded perspective view for explaining the configuration of the movable portion 22 of the vibration motor 21. In addition, about the component which has the same function as the vibration motor 1 of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The movable portion 22 includes magnets 6 and 26, a cylindrical yoke 7, and side yokes 8 and 28.

  The magnet 26 has the same configuration as the magnet 6 and is fixed to the upper surface of the inner wall of the cylindrical yoke 7 so as to face the magnet 6 with the coil substrate 3 interposed therebetween. Since magnetic attraction acts between the magnet 26 and the cylindrical yoke 7, the magnet 26 is fixed to the upper surface of the inner wall of the cylindrical yoke 7 by this magnetic attraction. Here, similarly to the magnet 6, the magnet 26 is fixed to the cylindrical yoke 7 so that the regions 61 and 62 and the neutral region 63 of the magnet 26 extend in a direction perpendicular to the opening surface of the cylindrical yoke 7. ing. As a result, the N pole face 6A of the magnet 6 and the S pole face 26B of the magnet 26 face each other, and the S pole face 6B of the magnet 6 and the N pole face 26A of the magnet 26 face each other.

  The side yoke 28 is made of the same material as that of the cylindrical yoke 7, and includes a side region 28 a disposed so as to close a portion where the magnet 26 is provided in both opening surfaces of the cylindrical yoke 7. And an upper surface region 28b arranged to cover the upper surface of the outer wall of the cylindrical yoke 7. The side yoke 28, the magnet 26, and the cylindrical yoke 7 are fixed using an adhesive.

  Next, a method for driving the vibration motor 21 will be described with reference to FIG. 12A to 12C are cross-sectional views for explaining a driving method of the vibration motor 21.

  In the vibration motor 21, unlike the first embodiment, the magnet 26 is provided, so that a magnetic flux is formed between the magnet 6 and the magnet 26. Specifically, since the N pole surface 6A of the magnet 6 and the S pole surface 26B of the magnet 26 face each other, a magnetic field is formed between the N pole surface 6A and the S pole surface 26B. Here, the direction of the magnetic field formed between the N pole face 6A and the S pole face 26B is the direction from the N pole face 6A toward the S pole face 26B, that is, the Y1 direction. Further, since the S pole surface 6B of the magnet 6 and the N pole surface 26A of the magnet 26 face each other, a magnetic field is formed between the S pole surface 6B and the N pole surface 26A. Here, the direction of the magnetic field formed between the S pole face 6B and the N pole face 26A is the direction from the N pole face 26A toward the S pole face 6B, that is, the Y2 direction.

  When the vibration motor 21 is driven, the planar coil 9 of the coil substrate 3 is moved to the A direction shown in FIG. 4A or the B direction shown in FIG. Current is supplied. As a result, the current flowing through the regions 9A and 9B of the planar coil 9 is subjected to a force by the magnetic field formed between the magnet 6 and the magnet 26, and is movable as shown in FIGS. The part 22 moves in the X1 direction and the X2 direction.

Thus, the vibration motor 21 reciprocates the movable portion 22 in the X1 direction and the X2 direction by switching the direction of the current supplied to the planar coil 9 by the drive current supply circuit on the same principle as in the first embodiment. Let it vibrate.

  Below, the effect of the vibration motor 21 of 2nd Embodiment is demonstrated.

  (10) The vibration motor 21 includes two magnets 6 and 26 arranged to face each other with the coil substrate 3 interposed therebetween. The N pole surface 6A of the magnet 6 faces the S pole surface 26B of the magnet 26, and the S pole surface 6B of the magnet 6 faces the N pole surface 26A of the magnet 26. As a result, a magnetic flux is formed between the N-pole surface 6A and the S-pole surface 26B and between the N-pole surface 26A and the S-pole surface 6B, so that only one magnet is provided. Thus, the magnetic path can be shortened. Therefore, the magnetic force between the magnet 6 and the magnet 26 becomes strong, and the vibration amount of the vibration motor can be increased. The remaining effects of the vibration motor 21 are the same as those of the vibration motor 1 of the first embodiment.

(Third embodiment)
Next, the configuration of the vibration motor 31 according to the third embodiment of the present invention will be described with reference to FIGS. 13 and 14. 13A and 13B are cross-sectional views for explaining the internal structure of the vibration motor 31. FIG. FIG. 14A is a top view of the planar coils 39 and 40 formed on the upper layer of the coil substrate 33, and FIG. 14B is a top view of the planar coils 39 and 40 formed on the lower layer of the coil substrate 33. FIG. 14C is a cross-sectional view of the coil substrate 33 taken along the line XX ′. In addition, about the component which has the same function as the vibration motor 1 of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The vibration motor 31 includes a movable part 32, a coil substrate 33, a spring 4 with a plate, an upper housing 5a, and a lower housing 5b. That is, the vibration motor 31 is different from the vibration motor 1 of the first embodiment in the configuration of the movable part and the coil substrate.

  As shown in FIGS. 13A and 13B, the movable portion 32 includes a magnet 36, a cylindrical yoke 7, and a side yoke 8. The magnet 36 is a rectangular parallelepiped member made of a magnetic material, and is magnetized so as to have a pair of magnetic poles in the thickness direction. The magnet 36 is arranged such that the length in the short direction is shorter than the length in the short direction of the inner wall surface of the cylindrical yoke 7 and the center of gravity is positioned at the center in the short direction of the cylindrical yoke 7. Has been.

  The coil substrate 33 is a rectangular substrate and is inserted from the opening surface of the cylindrical yoke 7 along the longitudinal direction of the coil substrate 33. Further, inside the coil substrate 33, as shown in FIGS. 14A to 14C, two coils 39 and 40 formed in a two-layer spiral shape are provided along the short direction of the coil substrate 33. Are formed in order.

  Specifically, as shown in FIG. 14C, the coil substrate 33 has a four-layer structure, and is provided on both sides of the coil layers 33b and 33c in which the planar coils 39 and 40 are embedded. It is comprised from the insulating layers 33a and 33d. The insulating layers 33a and 33d insulate the planar coils 39 and 40 provided on the coil layers 33b and 33c from the outside.

  In the coil layer 33b, the planar coils 39 and 40 are composed of upper layer coils 391 and 401 wound in opposite directions from the electrode pads 10c and 10d in the opposite directions. The lower layer coils 392 and 402 are wound in opposite directions in a substantially rectangular shape toward the pads 10e and 10f. The upper coil 391 and the lower coil 392 of the planar coil 39 are connected at the center of the spiral. Further, the upper coil 401 and the lower coil 402 of the planar coil 40 are also connected at the center of the spiral.

Further, the planar coils 39 and 40 have regions E to G including a plurality of coil wires extending along the longitudinal direction of the coil substrate 33 in the coil layers 33b and 33c, and current flows in the same direction for each region. It is formed to flow. Specifically, the coil wires in the regions F and G are formed so that current flows in the same direction, and the coil wire in the region E and the coil wires in the regions F and G flow in the opposite directions. Is formed.

  Further, both ends of the planar coils 39 and 40 are respectively connected to the drive current supply circuit via the electrode pads 10c, 10d, 10e, and 10f, and current is supplied from the drive current supply circuit in the direction of arrow A or B. The The drive current supply circuit switches the direction of the current supplied to the planar coils 39 and 40 at a predetermined cycle. Since the other configuration of the coil substrate 33 is the same as that of the coil substrate 3 of the first embodiment, the description thereof is omitted.

  Next, a driving method of the vibration motor 31 will be described with reference to FIG. FIGS. 15A to 15C are cross-sectional views for explaining a driving method of the vibration motor 31. In FIG. 15, the magnet 36 is magnetized with an N pole on the top surface and an S pole on the bottom surface. Here, a case where the movable part 32 is first moved in the X1 direction will be described.

  When the vibration motor 31 is driven, a current is supplied to the planar coils 39 and 40 of the coil substrate 33 in the direction of arrow A shown in FIG. Thereby, in the area E of the planar coils 39 and 40, as shown in FIG. 15A, current flows from the back side to the near side, that is, the Z2 direction along the longitudinal direction of the coil substrate 33. Further, current flows in the regions F and G of the planar coils 39 and 40 from the front side to the back side, that is, the Z1 direction along the longitudinal direction of the coil substrate 3.

  Here, since the magnetic field generated by the magnet 36 goes from the N pole to the S pole, the direction of the magnetic field on the N pole face is the direction from the surface of the N pole face toward the coil substrate 33, that is, the Y1 direction. Therefore, the current flowing through the region E of the planar coils 39 and 40 overlapping the N pole surface of the magnet 36 receives a force in the X2 direction from the magnetic field of the magnet 36. That is, a force in the X2 direction acts on the coil substrate 33.

  However, since the coil substrate 33 is fixed by the upper housing 5a and the lower housing 5b, the magnet 36 receives a force in the X1 direction due to the reaction. Therefore, the movable part 32 moves in the X1 direction as shown in FIG.

  Next, the drive current supply circuit switches the direction of the current supplied to the planar coils 39 and 40 to the B direction shown in FIG. Thereby, in the area E of the planar coils 39 and 40, as shown in FIG. 15C, a current flows from the front side to the back side, that is, the Z1 direction along the longitudinal direction of the coil substrate 33. Further, current flows in the regions F and G of the planar coils 39 and 40 from the back side to the front side, that is, the Z2 direction along the longitudinal direction of the coil substrate 33.

  Therefore, the current flowing through the region E of the planar coils 39 and 40 overlapping the N pole surface of the magnet 36 receives a force in the X1 direction from the magnetic field of the magnet 36. Thereby, the movable part 32 moves to X2 direction, as shown in FIG.15 (c).

  Here, when the movable part 32 is moved to the maximum in the X1 direction, if the area where the magnet 36 and the region G overlap is larger than the area where the magnet 36 and the region E overlap, the current flowing through the region E The force in the X1 direction that the current flowing in the region G receives from the magnetic field of the magnet 36 is larger than the force in the X2 direction that the magnetic field receives from the magnetic field of the magnet 36. Therefore, a force acts in a direction opposite to the direction in which the movable part 32 is about to move, and the vibration amount of the vibration motor 31 is reduced.

  Therefore, the positional relationship between the magnet 36 and the regions E to G of the planar coils 39 and 40 is greater than the area where the magnet 36 and the region G overlap when the movable part 32 is moved to the maximum in the X1 direction. The area where 36 and the region E overlap is designed to be larger. Similarly, when the movable portion 32 is moved in the X2 direction, similarly, the magnet 36 and the region E overlap so that the area where the magnet 36 and the region E overlap is larger than the area where the magnet 36 and the region F overlap. And the positional relationship between the areas E to G of the planar coils 39 and 40 are set.

  As described above, the vibration motor 31 reciprocates the movable portion 32 in the X1 direction and the X2 direction by switching the direction of the current supplied to the planar coils 39 and 40 by the drive current supply circuit.

  Further, the driving method of the present embodiment is movable by attractive force and repulsive force generated between the planar coils 39, 40 and the magnet 36 in order to generate magnetic fields in opposite directions when current is supplied to the planar coils 39, 40. It can be said that the part 32 is reciprocated in the X1 direction and the X2 direction.

  Below, the effect of the vibration motor 31 of 3rd Embodiment is demonstrated.

  (11) The vibration motor 31 includes a planar coil 33 including a planar coil 39 and a planar coil 40 that apply magnetic fields in opposite directions to the magnetic pole surface of the magnet 6. Thereby, even if the magnetic pole surface facing the coil substrate 33 of the magnet 6 has a single polarity, the movable portion 32 can be reciprocated, so that the manufacturing cost can be reduced. .

  (12) The vibration motor 31 includes the magnet 36 whose length in the short direction is shorter than the length in the short direction of the inner wall surface of the cylindrical yoke 7. Thus, since the magnet 36 having a small volume can be used as compared with the first embodiment, the entire apparatus can be reduced in weight, and the operation efficiency of the vibration motor 31 can be increased.

  The other effects of the vibration motor 31 are the same as those of the vibration motor 1 of the first embodiment.

(Fourth embodiment)
Next, the configuration of the vibration motor 41 according to the fourth embodiment of the present invention will be described with reference to FIG. FIG. 16 is an exploded perspective view for explaining the configuration of the vibration motor 41. In addition, about the component which has the same function as the vibration motor 1 of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 16, the vibration motor 41 includes a movable part 42, a coil substrate 3, a spring 44 with a plate, an upper housing 5 a, and a lower housing 5 b. The vibration motor 41 is configured by omitting the side yoke 8 from the movable portion 42 by using a spring 44 with a plate having a function as a magnetic shield instead of the side yoke 8.

  The movable part 42 includes the magnet 6 and the cylindrical yoke 7.

  The plate-attached spring 44 is made of a magnetic material, and plate springs 44a and 44b, a tray 44c, and a yoke portion 44d are integrally formed. SUS631, 632, spring steel, carbon steel, carbon tool steel, etc. are suitable as the material constituting the spring 44 with a plate. The yoke portion 44d is provided in a direction perpendicular to the tray 44c at the end of the tray 44c in the short direction. Specifically, the yoke portion 44d is formed so as to block a portion where the magnet 6 is provided in both opening surfaces of the cylindrical yoke 7 when the movable portion 42 is mounted on the tray 44c. The height of the yoke portion 44d is formed below the upper end of the magnet 6 so as not to come into contact with the coil substrate 3 due to the movement of the movable portion.

In addition, since the other structure of the spring 44 with a plate is the same as that of the spring 4 with a plate of 1st Embodiment, description is abbreviate | omitted. Further, since the driving method of the vibration motor 41 is the same as that of the vibration motor 1 of the first embodiment, the description thereof is omitted.

  Below, the effect of the vibration motor 41 of 4th Embodiment is demonstrated.

  (13) The vibration motor 41 does not include the side yoke 8 and uses a countersunk spring 44 having a function as a magnetic shield. As a result, the entire vibration motor 41 can be reduced in thickness because the side yoke 8 is not provided. The other effects of the vibration motor 41 are the same as those of the vibration motor 1 of the first embodiment.

(Fifth embodiment)
Next, the configuration of the vibration motor 51 according to the fifth embodiment of the present invention will be described. In the first to fourth embodiments, the movable part is moved in a direction perpendicular to the direction in which the coil substrate is inserted into the cylindrical yoke. However, in the present embodiment, the coil substrate is inserted into the cylindrical yoke. It is the structure which moves a movable part along a direction. In the vibration motor 51, the moving direction of the movable part is made different by changing the direction of the magnet and the coil substrate of the movable part of the first embodiment by 90 degrees.

  17A is a top view for explaining the internal structure of the vibration motor 51, FIG. 17B is a cross-sectional view taken along the line AA ′ of FIG. 17A, and FIG. It is BB 'sectional drawing of 17 (a). FIG. 18A is a top view of the planar coil 9 formed in the upper layer of the coil substrate 3, and FIG. 18B is a top view of the planar coil 9 formed in the lower layer of the coil substrate 3. In addition, about the component which has the same function as the vibration motor 1 of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The vibration motor 51 includes a movable part 52, a coil substrate 3, a spring 54 with a dish, an upper housing 5a, and a lower housing 5b.

  Like the movable part 2 of the first embodiment, the movable part 52 includes a magnet 6, a cylindrical yoke 7, and a side yoke 8. The movable part 52 fixes the magnet 6 in the cylindrical yoke 7. The direction differs from the movable part 2 by 90 degrees. That is, in the movable portion 52, the magnet 6 is fixed to the bottom surface of the inner wall of the cylindrical yoke 7 so that the regions 61 and 62 and the neutral region 63 of the magnet 6 extend in parallel with the opening surface of the cylindrical yoke 7.

  As shown in FIGS. 18A and 18B, the planar coil 9 formed on the coil substrate 3 has regions 9C and 9D including a plurality of coil wires extending along the short direction of the coil substrate 3. Each region is formed so that current flows in the same direction. In the vibration motor 51, the positional relationship between the magnet 6 and the planar coil 9 is such that the regions 9C and 9D of the planar coil 9 and the N pole surface 6A and S pole surface 6B of the magnet 6 are respectively shown in FIG. It arrange | positions so that it may overlap.

  The plate-attached spring 54 is integrally formed with two plate springs 54a and 54b and a tray 54c. The plate-attached spring 54 mounts the movable portion 52 on the tray 54c, supports both side surfaces of the movable portion 52 in the moving direction by sandwiching the plate springs 54a and 54b, and receives the movement of the movable portion 52.

  Both side surfaces in the moving direction of the movable portion 52 are opening surfaces of the cylindrical yoke 7, and side surface regions 8 a of the side yokes 8 arranged so as to close the portions where the magnets 6 are provided on the opening surfaces. Is provided. Therefore, the leaf springs 54 a and 54 b support the side surface region 8 a and the height thereof is designed so as not to contact the coil substrate 3. In addition, since the other structure of the spring 54 with a plate is the same as that of the spring 4 with a plate of 1st Embodiment, description is abbreviate | omitted.

  Next, a method for driving the vibration motor 51 will be described.

  The driving method of the vibration motor 51 is the same as the driving method of the vibration motor 1 of the first embodiment, and the current flowing in the regions 9C and 9D of the planar coil 9 is on the N-pole surface 6A and the S-pole surface 6B of the magnet 6. By receiving a force from the upper magnetic field, the movable portion 52 moves along the longitudinal direction of the coil substrate 3. Since the side surface in the moving direction of the movable portion 52 is the opening surface of the cylindrical yoke 7, the movable portion 52 can move without the inner wall side surface of the cylindrical yoke 7 colliding with the coil substrate 3.

  Below, the effect of the vibration motor 51 of 5th Embodiment is demonstrated.

  (14) The vibration motor 51 moves the movable portion 52 along the direction in which the coil substrate 3 is inserted into the cylindrical yoke 7. As a result, as in the first to fourth embodiments, the moving distance of the movable portion is increased as compared with the case where the movable portion is moved in a direction perpendicular to the insertion direction of the coil substrate into the cylindrical yoke. It is possible to increase the amount of vibration.

(Sixth embodiment)
Next, the configuration of the vibration motor 61 according to the sixth embodiment of the present invention will be described. In the vibration motor 61, the configuration of the vibration motor 31 of the third embodiment is changed to a configuration in which the movable portion is moved along the insertion direction of the coil substrate into the cylindrical yoke, like the vibration motor 51 of the fifth embodiment. It is a thing. The vibration motor 61 changes the moving direction of the movable part by making the arrangement directions of the two planar coils formed on the coil substrate different from those of the vibration motor 31 of the third embodiment.

  19A is a top view for explaining the internal structure of the vibration motor 61, FIG. 19B is a cross-sectional view taken along the line AA ′ of FIG. 19A, and FIG. It is BB 'sectional drawing of 19 (a). 20A is a top view of the planar coils 69 and 70 formed in the upper layer of the coil substrate 63, and FIG. 20B is a top view of the planar coils 69 and 70 formed in the lower layer of the coil substrate 63. FIG. is there. In addition, about the component which has the same function as the vibration motors 31 and 51 of 3rd, 5th embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The vibration motor 61 includes a movable portion 62, a coil substrate 63, a countersunk spring 54, an upper housing 5a, and a lower housing 5b.

  The movable part 62 includes a magnet 66, a cylindrical yoke 7, and a side yoke 8. The magnet 66 is magnetized so as to have a pair of magnetic poles in the thickness direction, similarly to the magnet 36 of the third embodiment, but the length in the short direction is short of the inner wall surface of the cylindrical yoke 7. It is configured to be substantially the same as the length in the hand direction.

  As shown in FIGS. 20A and 20B, the coil substrate 63 is a rectangular substrate in which two spiral spiral two-layer coils 69 and 70 are formed. The planar coils 69 and 70 are formed in order along the longitudinal direction of the coil substrate 63. Since the other configuration of the coil substrate 63 is the same as that of the coil substrate 33 of the third embodiment, the description thereof is omitted.

  The driving method of the vibration motor 61 is the same as that of the vibration motor 31 of the third embodiment. The current flowing through the planar coils 69 and 70 receives a force from the magnetic field of the magnet 36, so that the movable portion 62 moves. Here, since the planar coils 69 and 70 are formed in order along the longitudinal direction of the coil substrate 63, the movable portion 62 is disposed in the longitudinal direction of the coil substrate 63, that is, the direction in which the coil substrate 63 is inserted into the cylindrical yoke 7. Move along.

  Since the effect of the vibration motor 61 is the same as that of the vibration motors 31 and 51 of the third and fifth embodiments, the description thereof is omitted.

(Seventh embodiment)
Next, the configuration of the vibration motor according to the seventh embodiment of the present invention will be described. The vibration motor according to the present embodiment includes a movable portion 72, a coil substrate 3, a countersunk spring 4, an upper housing 5a, and a lower housing 5b. That is, the vibration motor of the present embodiment is different from the vibration motor 1 of the first embodiment in the configuration of the movable part.

  FIG. 21 is an exploded perspective view for explaining the configuration of the movable portion 72 of the vibration motor of the present embodiment. In addition, about the component which has the same function as the vibration motor 1 of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The movable portion 72 includes the magnet 6, the cylindrical yoke 7, and the auxiliary yoke 80. The auxiliary yoke 80 is made of the same material as that of the cylindrical yoke 7 and is provided so as to cover the side surface of the magnet 6. That is, the movable part 72 omits the side yoke 8 by using the auxiliary yoke 80 having a function as a magnetic shield instead of the side yoke 8. Here, in order to make it easy to attach the auxiliary yoke 80 to the magnet 6, a cutting portion 80 a is provided. The end of the cut portion 80a of the auxiliary yoke 80 may be in a state where a gap is left on the neutral region 63 of the magnet 6 or may be connected. Even if a gap is formed between the auxiliary yoke 80 on the neutral region 63, the neutral region 63 is not magnetized, so that the magnetic flux generated by the magnet 6 hardly leaks out from the gap.

  The magnet 6 provided with the auxiliary yoke 80 is fixed to the bottom surface of the inner wall of the cylindrical yoke 7. In addition, since the other structure of the movable part 72 is the same as the movable part 2 of 1st Embodiment, description is abbreviate | omitted. Further, since the driving method of the vibration motor of the present embodiment is the same as that of the vibration motor 1 of the first embodiment, description thereof is omitted.

  The effects of the vibration motor according to the seventh embodiment will be described below.

  (15) The vibration motor of this embodiment does not include the side yoke 8 but includes the auxiliary yoke 80 that functions as a magnetic shield. As a result, the entire vibration motor can be reduced in thickness because the side yoke 8 is not provided.

  (16) In the vibration motor of this embodiment, the side surface of the magnet 6 is covered with the auxiliary yoke 80 made of a magnetic material. Thereby, it can further suppress that the magnetic flux which the magnet 6 produces leaks outside the vibration motor. Therefore, the operating efficiency of the vibration motor can be increased, and the amount of vibration can be increased.

  (17) In the vibration motor of the present embodiment, the area of the bottom surface of the magnet 6 is smaller than the area of the bottom surface of the inner wall of the cylindrical yoke 7 by the amount provided with the auxiliary yoke 80. Therefore, the vibration motor of the present embodiment can shorten the magnetic path of the magnetic flux generated by the magnet 6 and increase the amount of vibration, as shown in the modification (C) of the first embodiment. . Furthermore, since the auxiliary yoke 80 is provided as compared with the case where the area of the bottom surface of the magnet 6 is simply reduced, the movable portion 72 can be made heavier. Therefore, it is possible to further increase the vibration amount of the vibration motor.

  (18) In the vibration motor of this embodiment, by providing the auxiliary yoke 80, the magnetic resistance of the magnetic circuit formed from the magnet 6 and the cylindrical yoke 7 can be reduced. Thereby, the permeance coefficient of a magnetic circuit can be increased and the heat resistance of the magnet 6 can be improved. Therefore, even when heat is applied to the magnet 6 from the outside at the time of manufacturing the vibration motor, or when heat generated from the planar coil 9 is applied, it is possible to suppress a decrease in the magnetic force of the magnet 6. .

  In the present embodiment, the auxiliary yoke 80 has a configuration in which the cutting portion 80a is provided. However, the present invention is not limited to this, and may have a configuration in which no cutting portion is provided.

  In the present embodiment, the auxiliary yoke 80 is made of a magnetic material, but the present invention is not limited to this, and may be made of a nonmagnetic material. In this case, there is no effect of confining the magnetic flux generated by the magnet 6 in the auxiliary yoke 80 and further suppressing the leakage of the magnetic flux to the outside of the vibration motor. Can be made heavy. As a material constituting the auxiliary yoke 80, it is preferable to use a non-ferrous metal having a specific gravity larger than that of iron such as tungsten in order to make the movable part heavy.

  In addition, although the auxiliary yoke 80 has been described as an example applied to the configuration of the first embodiment in the present embodiment, the auxiliary yoke 80 can also be suitably applied to the configurations of the second to sixth embodiments.

[Mobile phone]
Next, a mobile phone according to the present invention will be described with reference to FIGS. FIG. 22 is a top view for explaining the mobile phone 100 of the present embodiment. 23 is a cross-sectional view taken along the line XX ′ of the mobile phone 100 shown in FIG.

  As shown in FIGS. 22 and 23, the mobile phone 100 includes the vibration motor 1 of the first embodiment, a display unit 101, and a CPU 102.

  The vibration motor 1 is for vibrating the mobile phone 100. As shown in FIG. 23, the vibration motor 1 is fixed to the surface opposite to the side on which the display unit 101 is disposed in the mobile phone 100. . The display unit 101 is configured by a touch panel panel, and is used by the user to operate the mobile phone 100 by pressing the button unit 101a displayed on the display unit 101. The CPU 102 controls various functions of the mobile phone 100. When the CPU 102 detects that the button unit 101a is pressed or when the manner mode is set when a call is received, The vibration motor 1 is controlled to vibrate.

  Below, the effect of the mobile phone 100 of this embodiment is demonstrated.

  (19) The mobile phone 100 can be thinned, and is equipped with the vibration motor 1 of the first embodiment having a high degree of design freedom for the leaf springs 4a and 4b. As a result, it is possible to reduce the thickness of the entire apparatus and to obtain a sufficient amount of vibration that can be recognized by the user.

  In the present embodiment, the configuration in which the vibration motor 1 of the first embodiment is mounted on a mobile phone has been described. However, the present invention is not limited to this, and the vibration motor 1 is mounted on another mobile device such as a PDA. It may be. In particular, the vibration motor 1 is preferably used in a portable device using a touch panel.

  Moreover, although this embodiment demonstrated the example in which the vibration motor 1 of 1st Embodiment was mounted, it cannot be overemphasized that the vibration motor of 2nd-7th embodiment can also be mounted suitably.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope shown in the claims. That is, embodiments obtained by combining technical means appropriately modified within the scope of the claims are also included in the technical scope of the present invention.

1, 21, 31, 41, 51, 61 Vibration motors 2, 22, 32, 42, 52, 62 Movable parts 3, 33, 63 Coil substrates 4, 44, 54 Spring with plate (elastic member)
5 Case (fixed part)
5a Upper housing (fixed part)
5b Lower housing (fixed part)
6, 26, 36, 66 Magnet 7 Cylindrical yoke (supporting member)
8, 28 Yoke for side surface 9, 39, 40, 69, 70 Planar coil (coil)
80 Auxiliary yoke (auxiliary member)
100 Mobile phone (mobile device)
101 Display unit 102 CPU

Claims (8)

A fixed part;
A movable part that includes a magnet and a support member provided in a side surface direction of the magnet and moves relative to the fixed part;
A coil arranged opposite to the magnet and moving the movable part in a direction in which the support member is provided;
An elastic member provided between the fixed portion and the support member;
The vibration motor according to claim 1, wherein the support member faces the magnet and the coil. The magnet includes a first magnet and a second magnet disposed to face each other with the coil interposed therebetween,
2. The vibration motor according to claim 1, wherein a polarity of a surface of the first magnet facing the coil is different from a polarity of a surface of the second magnet facing the coil.   The magnet includes a first magnetic pole surface having a first polarity and a second magnetic pole surface having a second polarity different from the first polarity on a surface facing the coil. The vibration motor according to 1 or 2.   The vibration motor according to claim 1, wherein the coil includes a first coil and a second coil that cause magnetic fields in opposite directions to act on the magnetic pole surface of the magnet.   The said support member is extended and formed to the surface on the opposite side to the surface facing the said coil of the said magnet, and has a function as a magnetic shield, The any one of Claims 1-4 characterized by the above-mentioned. The vibration motor described in 1.   The vibration motor according to claim 1, wherein a side surface of the magnet and the support member are arranged with a predetermined gap therebetween.   The vibration motor according to claim 1, further comprising an auxiliary member that covers a side surface of the magnet.   A portable device comprising the vibration motor according to claim 1.

Images