JPH0739105A - Vibration actuator for mobile devices - Google Patents

Abstract

(57) [Summary] [Objective] This is a vibration actuator for portable devices, which consumes less battery current and has a smaller thickness, which makes it easier for the human body to sense vibrations in different directions. [Structure] The substrate (111) has a stator part (11).
Is formed, and the drive coil (121) and the position detection coil (122) are mounted on the stator part (11). The rotor portion (13) includes a permanent magnet (131) rotatably attached and the permanent magnet (13).
Back yoke (132, 133) attached to 1)
Two transducers (134, 13) attached via
5) and each of the oscillators (134, 135) as a cantilever beam, and the substrate (1
11) and supporting portions (14, 15) attached to both ends.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to transmitting vibration generated from a vibration actuator to a human body in an information transmission device such as a portable device, for example, a card type pager, a wrist watch, a mobile phone, or a signal receiver for the blind. The present invention relates to a vibration actuator for a mobile device that transmits various kinds of information to a wearer of the mobile device. Hereinafter, in the present specification, a device that transmits certain information by transmitting vibration to the human body is simply referred to as an “information transmission device”.

[0002]

2. Description of the Related Art An information transmission device using a vibration motor is
Since it is possible to transmit a certain kind of information to surrounding people without causing any inconvenience only by vibration, it has come to be used for pagers, wrist watches, mobile phones, signal receivers for the blind, etc., which are replaced by pagers in recent years. . FIG. 4 is a diagram for explaining a vibration generator in a conventional example. In FIG. 4, the vibration generator includes a cylindrical motor 41, a rotating shaft 42 of the cylindrical motor 41, and an eccentric vibrator 43 made of high specific gravity heavy metal and attached to the rotating shaft 42. To attach the rotary shaft 42 and the oscillator 43, for example, a brass bush 44 is press-fitted into the shaft hole 45 of the oscillator 43. Then, the rotary shaft 42 of the cylindrical motor 41 is press-fitted into the shaft hole 46 of the bush 44. The vibration generating device includes the rotating shaft 4 of the cylindrical motor 41.
Vibration was obtained by rotating the half-moon shaped oscillator 43 attached to the tip of 2 at high speed.

However, the cylindrical motor 41 as described above
Since it is difficult to make the card type portable information transmission device thin, a flat vibration motor has been developed.
That is, the present applicant has proposed a vibration actuator for a mobile device used for an information transmission device as Japanese Patent Application No. 3-156270 (filed on May 31, 1991). FIG. 5 is a schematic view of a vibration actuator for a mobile device in a conventional example. In FIG. 5, the mobile device vibration actuator includes a case 50, a vibration portion 60, and a stator portion 70.

The case 50 also serves as a back yoke of a vibration actuator for portable equipment, and a permanent magnet 51 is attached to a predetermined position inside thereof. The vibrating unit 60 includes a coil 61 including a drive coil 62 and a position detection coil 63.
A drive circuit 64 for intermittently supplying a current to the drive coil 62, a printed wiring board 65 to which the coil 61 and the drive circuit 64 are attached, and a printed wiring board 65 supported so as to be vibrable. And a terminal 67, 68 for supplying power to the spring member 66.

The stator portion 70 accommodates the vibrating portion 60 together with the case 50. In addition, the stator part 70 includes a stator substrate 71 and a stator yoke 72 formed at a predetermined position.
And power supply terminals 73 and 74 for supplying a current to the drive coil 62 or the drive circuit 64, and the power supply terminal 73,
Wiring patterns 75, 76 from 74 to a predetermined position
And connection terminals 77 and 78 that connect the wiring patterns 75 and 76 to the terminals 67 and 68 of the vibrating section 60.

The vibrating portion 60 is housed by the case 50 and the stator portion 70. Also at this time,
The printed wiring board 65 has spring members 66, 6 fixed at one end.
Since it is fixed to the free end which is the other end of 7, it is in a vibrating state. Furthermore, an air gap is interposed between the coil 61 and the permanent magnet 51, and between the coil 61 and the stator yoke 72. When a current flows through the drive coil 62 in such a state, an electromagnetic force is generated in the drive coil 62 by the current flowing through the drive coil 62 and the permanent magnet 51, and the printed wiring board 65 provided with the drive coil 62. Moves in the same plane with one end of the spring member 66 as a fulcrum. Then, the position detection coil 63, which is wound concentrically with the drive coil 62, detects that the printed wiring board 65 has moved, and cuts off the current flowing through the drive coil 62 by a drive circuit (not shown). afterwards,
When no current flows through the drive coil 62, the printed wiring board 6
5 is restored to its original position by the force of the spring member 66.
That is, ON / OFF of the current flowing through the drive coil 62
Thus, the printed wiring board 65 continuously repeats the reciprocating motion within the same plane.

[0007]

The vibration source using the cylindrical motor 41 drives the cylindrical motor 41 because the vibrator 43 having an unbalanced mass attached to its shaft is rotated at high speed. Due to the large battery capacity, it was not possible to make it small and thin as a vibration source for mobile devices. Further, the cylindrical motor 41 has a short life because it is worn by a rotating portion such as a shaft due to rotational vibration, and expensive tungsten or the like is used for the vibrator, which is an expensive vibration source. Further, in the above vibration motor, when there is a brush or a commutator, sliding noise due to these, impact noise to the bearing,
Alternatively, there is a problem that mechanical noise is large. Further, the cylindrical motor 41 is limited to have a diameter of 5 mm, but a vibration actuator for portable equipment having a thickness of 2 mm to 4 mm is required.

Further, since the flat type motor which solves some of the above problems is coreless, the torque generating efficiency is poor and the current consumption is large. Further, the vibration actuator for a mobile device proposed by the applicant assigns vibration in one direction by the spring member 66. Such a unidirectional vibration, for example, when used for a pager and put in a pocket of a shirt, is parallel to the human body, and thus has a problem that it is difficult to feel the vibration. Due to the battery, the vibration actuator for portable devices needs to reliably transmit vibration to the body with a current consumption of about 10 mA.

The present invention has been made to solve the above problems and, for example, requires only a current consumption (about 10 mA) of a lithium battery, and is a thin type vibration actuator for portable equipment, which corresponds to the thickness (2 mm). The purpose is to provide. It is an object of the present invention to provide a vibration actuator for a mobile device, which makes it easier for the human body to feel this vibration by vibrating it in different directions.

[0010]

(First Invention) In order to achieve the above object, a vibration actuator for a portable device of the present invention is a substrate (11) on which a stator portion (11) is formed.
1), a drive coil (121) and a position detection coil (122) mounted on the substrate (111), and a permanent magnet (131) rotatably mounted on a rotor section (13). And two vibrators (134, 135) attached to the rotor portion (13) via back yokes (132, 133), and the vibrators (1).
34, 135) is supported as a cantilever beam, and is also composed of supporting portions (14, 15) attached to both ends of the substrate (111) so as to generate torsional vibration.

(Second Invention) The rotor section (13) in the vibration actuator for portable equipment of the present invention is a first vibrator which is integrally formed with the permanent magnet (131) and the first back yoke (132). (134) and the permanent magnet (131), and the first back yoke (13).
2) and a second vibrator (135) attached to a second back yoke (133) connected to the second back yoke (133).

(Third Invention) The vibrators (134, 135) and the permanent magnets (131) in the vibration actuator for portable equipment of the present invention are semi-cylindrical, and the drive coil (12).
1) and the position detection coil (122) are concentrically wound in a triangular shape, one side of which is fixed to the substrate (111), and the other side of the drive coil (121) is the permanent magnet (131). It is configured to face each other with the largest area.

(Fourth Invention) Each vibrator (134, 135) in the vibration actuator for portable equipment of the present invention has one end supported by a leaf spring (143, 153) and the leaf spring (143). , 153) in different directions.

(Fifth Invention) The cycle of torsional reciprocation of the vibrators (134, 135) in the vibration actuator for portable equipment of the present invention is determined by the mass of the vibrating portion and the leaf springs (143,
153) and the spring constant.

(Sixth Invention) In order to reduce the height of each leaf spring (143, 153) in the first vibrator (134) and the second vibrator (135) in the vibration actuator for portable equipment of the present invention. The grooves (1341, 1351) are formed.

[0016]

[Operation] (First invention) In order to achieve the above object,
In the vibration actuator for a mobile device of the present invention, when a drive coil mounted on a substrate is energized, an attractive force or a repulsive force is generated on a permanent magnet according to Fleming's law. The movement of the permanent magnet due to this force is detected by the position detection coil. The position detection coil that has detected the movement of the permanent magnet stops energizing the drive coil. The two oscillators, which are integrally attached to the permanent magnet via a back yoke, are fixed as a cantilever beam with one end supported, and are attached so as to generate torsional vibrations by, for example, leaf springs having different directions. . The vibration generated from the vibration actuator for a mobile device of the present invention is a torsional vibration that is different from one direction, and is easily felt by the human body with a small amount of energy.

(Second Invention) When the drive coil is energized, a magnetic field is generated in the first and second back yokes. This magnetic field and the polarity of the permanent magnet repel each other, and the first and second
The first and second oscillators attached to the back yoke move in one direction.

(Third Invention) The vibrator and the permanent magnet have a semi-cylindrical shape. Similarly, since the drive coil and the position detection coil are concentrically wound in a triangular shape, one side of the drive coil should face the permanent magnet in the largest area, rather than making each of the coils circular. You can
Therefore, the shapes of the permanent magnet and the coil in the present invention are the most efficient.

(Fourth Invention) Since each of the vibrators has one end supported by a leaf spring and the leaf springs are oriented in directions different by 90 degrees, for example, they are different from each other by 90 degrees. It is easy to move in the direction.
That is, the two oscillators try to move in the same direction, but since the easy direction of movement of the leaf spring is different by 90 degrees, one of the vibrators is twisted in the component force direction of the moving direction and the easily moving direction. Moving. As a result, when this vibration source is applied to a vibration actuator for a mobile device, the vibration has a component in a direction perpendicular to the human body in addition to the horizontal direction, and thus is easily felt.

(Fifth Invention) Since the cycle of the torsional reciprocating motion of each vibrator is determined by the mass of the first and second vibrating parts and the spring constant of each leaf spring, it is applied to a vibration actuator for portable equipment. If so, it can be most easily felt by the human body.

(Sixth Invention) Grooves are formed in the first vibrator and the second vibrator. The leaf springs that support the vibrators are supported in the groove so that they can vibrate. Therefore, the height of the entire vibrator can be reduced.

[0022]

EXAMPLE An example of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of an embodiment of a vibration actuator for a mobile device according to the present invention. FIG. 2 is a diagram for explaining the relationship between the permanent magnet and the drive coil in the present invention. FIG. 3 is a diagram for explaining an embodiment of a drive circuit for a vibration actuator for portable equipment according to the present invention. The vibration actuator for a mobile device includes a stator 11, a drive coil 121, and a position detection coil 122.
And a rotor unit 13 having two vibrators, which will be described later, and first and second support units 14 and 15 that support these vibrators.

The stator section 11 is composed of a substrate 111 on which a vibration actuator for portable equipment is placed, and a stator member 11 made of a magnetic material on the substrate 111 and serving as a stator.
2 and. The drive unit 12 includes, for example, a drive coil 121 wound in a triangle and the drive coil 1
21 and a position detection coil 122 wound concentrically with each other, and a drive circuit (not shown).

The rotor portion 13 is made of, for example, a neodymium-iron-boron-based member, and has a rotatable semi-cylindrical permanent magnet 131 and a first back yoke 132 fixed integrally with the permanent magnet 131. The first back yoke 1
A second back yoke 133 that is connected to 32 by a connecting portion 136, a semi-cylindrical first oscillator 134 that is fixed to the first back yoke 132, and is fixed to the second back yoke 133. The second vibrator 135 has a semi-cylindrical shape. In addition, the first oscillator 134
Grooves 1341 and 1351 are formed in the second vibrator 135.

The first support portion 14 has a first support spring 141 supported at one end of the substrate 111, one end fixed by the first support spring 141 at a first fulcrum 142, and the other end at the first support spring 141. The first fixing unit 144 includes a first oscillator 134 and a first plate spring 143 fixed to the first oscillator 134. The second support portion 15 includes a second support spring 151 supported by the other end of the substrate 111 and the second support spring 1
One end is fixed by the second fulcrum 152 by 51, and the other end is constituted by the second plate spring 153 fixed to the second vibrator 135 by the second fixing portion 154. The first leaf spring 143 is provided with the arrow 16
In this direction, the second leaf springs 153 are provided in directions different from each other by, for example, 90 degrees so that the second leaf springs 153 can easily move in the direction indicated by the arrow 18. In addition, the first leaf spring 143 and the second leaf spring 153, in the grooves 1341 and 1351,
Vibration is possible. Therefore, the overall height of the rotor portion 13 can be set low.

In FIG. 2, the drive coil 121 is wound in a triangular shape, and the position detection coil 122 that concentrically detects the position of the permanent magnet 131 is wound. Then, the drive coil 121 and the position detection coil 1
One side of the triangle 22 is fixed on the substrate 111. In FIG. 3, the drive circuit includes a drive coil 121 that vibrates the first and second oscillators 134 and 135, a position detection coil 122 that detects the position of the permanent magnet 131, and
A power source 123 such as a lithium battery for driving the drive coil 121, a switching transistor 124 for intermittently supplying a current flowing through the drive coil 121, and an electromotive force generated in the position detection coil 122 are provided. To the other terminal through a feedback resistor Rf for feeding back the voltage of the drive coil 121 and a resistor RA, for example, and a comparator 125 including a differential amplifier.

In the drive circuit, when the power source 123 is turned on by a power switch (not shown), a current flows through the drive coil 121. An electromagnetic force acts on the first and second back yokes 132, 133 due to the current flowing through the drive coil 121 and the magnetic field generated by the permanent magnet 131,
It moves in one direction around the first fulcrum 142 and the second fulcrum 152. Since the relative position between the permanent magnet 131 and the drive coil 121 is displaced, the electromotive force generated in the position detection coil 122 is reduced, and this voltage is input to one terminal of the comparator 125. As for the voltage input to the other terminal of the comparator 125, the voltage applied to the drive coil 121 is fed back by the feedback resistor Rf. The output voltage of the comparator 125 at this time is the drive coil 121 and the power source 1.
The switching transistor 124 between 23 and 23 works to be turned off. As a result, the drive coil 121
When the current stops flowing to the drive coil 121, the drive coil 121 returns to the original position by the restoring force of the first plate spring 143 and the second plate spring 153, and becomes the initial state. By repeating this, the reciprocating motion in the directions of the arrows 16 and 17 is performed. However, since the first plate spring 143 and the second plate spring 153 have different directions in the thickness direction, for example, 90 degrees, the movements of the first oscillator 134 and the second oscillator 135 are torsional movements. At this time,
The first leaf spring 143 and the second leaf spring 153 have grooves 1341 and 1 provided in the first oscillator 134 and the second oscillator 135, respectively.
It can vibrate inside 351. Therefore, the height of the vibration actuator for portable devices can be reduced.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments. And
Various design changes can be made without departing from the present invention described in the claims. For example, the shapes of the leaf spring, the vibrator, and the permanent magnet can be modified in cross section other than those shown in FIG. 1 as long as they cause torsional vibration. Further, as the material of the leaf spring and the permanent magnet, any material other than those described in the embodiments can be adopted. Similarly, the drive circuit is not limited to the embodiment, and can be replaced with circuit components having equivalent functions.

[0029]

According to the present invention, since there is no mechanical friction portion and mechanical loss is caused only by the spring member, it is possible to provide a vibration actuator for portable equipment having a simple structure, low noise and long life. According to the present invention, a current flows only when moving in one direction of the reciprocating motion of a vibrator and is restored by utilizing the force of a spring member, so that the current consumption is small and the rotor unit and the drive circuit are simplified. You can According to the present invention, the back yoke, which faces the permanent magnet, performs a pendulum motion together, so there is no magnetic attraction or iron loss to the stator portion, and the spring pressure of the supporting plate spring can be small.

According to the present invention, the leaf springs that support the rotor portion are supported as cantilever beams, and
Since the twisting motion is performed, the center of the pendulum motion can be supported, and a supporting body such as a bearing or a shaft is unnecessary. According to the present invention, the cycle of the pendulum movement depends on the resonance frequency that is the torsional restoring force of the leaf spring and the resonance frequency determined by the mass of the rotor portion, so that a stable vibration cycle can be obtained and a direction easily felt by the human body. It is possible to provide a thin vibration actuator for portable devices that vibrates at any rate.
According to the present invention, since the leaf spring can vibrate in the groove formed in the vibrator, the overall height of the mobile device actuator can be kept low.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a vibration actuator for portable equipment according to the present invention.

FIG. 2 is a diagram for explaining a relationship between a permanent magnet and a drive coil in the present invention.

FIG. 3 is a diagram for explaining an embodiment of a drive circuit for a vibration actuator for portable equipment according to the present invention.

FIG. 4 is a diagram for explaining a vibration generator in a conventional example.

FIG. 5 is a schematic view of a vibration actuator for a mobile device in a conventional example.

[Explanation of symbols]

 11 ... Stator part 111 ... Substrate 112 ... Stator member 12 ... Drive part 121 ... Drive coil 122 ... Position detection coil 123 ... Power supply 124 ... Switching transistor 125. ..Comparator 13 ... Rotor part 131 ... Permanent magnet 132 ... First back yoke 133 ... Second back yoke 134 ... First oscillator 135 ... Second oscillator 1341, 1351 ... Groove 136 ... Connection part 14 ... First support part 141 ... First support spring 142 ... First fulcrum 143 ... First plate spring 144 ... First fixing part 15・ ・ ・ Second support 151 ・ ・ ・ Second support spring 152 ・ ・ ・ Second fulcrum 153 ・ ・ ・ Second leaf spring 154 ・ ・ ・ Second fixing part

Claims (6)

[Claims] 1. A rotor unit including a substrate on which a stator unit is formed, a drive coil and a position detection coil mounted on the substrate, and a permanent magnet rotatably mounted, and the rotor. Two vibrators attached to the portion via a back yoke, and supporting portions that support each of the vibrators as a cantilever beam and are attached to both ends of the substrate so as to generate torsional vibration. A vibration actuator for mobile devices. 2. The rotor unit includes a first vibrator integrally formed with the permanent magnet via a first back yoke, and a first oscillator that faces the permanent magnet and is connected to the first back yoke. 2. The vibration actuator for a portable device according to claim 1, comprising a second vibrator attached to the two back yokes. 3. The vibrator and the permanent magnet have a semi-cylindrical shape, and the drive coil and the position detection coil are concentrically wound in a triangular shape, and one side of the drive coil and the position detection coil are fixed to the substrate, The vibration actuator for a mobile device according to claim 1, wherein a side has a shape facing the permanent magnet in the largest area. 4. The vibration actuator for a portable device according to claim 1, wherein each of the vibrators has one end supported by a leaf spring, and the leaf springs have different directions. 5. The cycle of torsional reciprocation of the oscillator is
The vibration actuator for a portable device according to claim 1, wherein the vibration actuator is determined by the mass of the vibrating portion and the spring constant of each leaf spring. 6. The first oscillator and the second oscillator,
The vibration actuator for a portable device according to claim 1, wherein a groove for reducing the height of each leaf spring is formed.