WO1998019383A1

WO1998019383A1 - Vibration generator

Info

Publication number: WO1998019383A1
Application number: PCT/JP1997/003886
Authority: WO
Inventors: Hideo Nakazaki; Nobutaka Nakamura; Masayuki Mouri; Takafumi Yamamoto; Kazushige Matsuoka; Taisuke Ueda
Original assignee: Omron Corporation
Priority date: 1996-10-30
Filing date: 1997-10-27
Publication date: 1998-05-07

Abstract

An inexpensive vibration generator which does not consume much electric power and has a small size and a long service life is provided with fixed permanent magnets (3 and 4) fixed to both ends of a cylindrical enclosure (1), a mobile permanent magnet (5) housed in the hollow section (2) of the enclosure (1), and a driving coil (6) which is provided on the outer circumference of the enclosure (1) to generate magnetism when the coil (6) is energized with electric power from a pulsative power source (7). The generator vibrates when a driving force generated by the changes of the magnetism generated from the coil (6) and magnetic fluxes from the fixed permanent magnets (3 and 4) and mobile permanent magnet (5) is applied to the mover (5) of the mobile permanent magnet (5) to allow the magnet (5) to make reciprocating motions in the hollow section (2) of the enclosure (1).

Description

W Description Vibration generator Technical field

The present invention relates to a vibration generator for a vibration calling device used for a pager, a cellular phone, and the like. Background art

In recent years, in the case of pagers and mobile phones that have become widespread, using voice to inform the owner that a call has been made may cause annoyance to nearby people. For this reason, the use of a vibration generator to notify a call is increasing. Several types of vibration generators using movable permanent magnets have been proposed for these devices. As this type of vibration generator, for example, as shown in FIG. 40, a case 41 made of a non-magnetic material and having a stepped recess on the outer periphery, A drive coil 42 wound around the concave portion, and a movable part having a weight 46 attached integrally to a permanent magnet 47 magnetized in the longitudinal direction of the housing case 41 on the inner diameter of the drive coil 42. The movable part is sealed with the lower yoke 44 and the upper yoke 43 at both ends of the case 41 via the mouth spring springs 48 and the upper spring springs 45 arranged on both end faces of the movable part. There is a case in which a loosely fixed housing 43 and a low-frequency oscillation circuit 40 are integrally fixed. Then, vibration is generated by applying a low-frequency current to the drive coil 44 (Japanese Utility Model Laid-open No. 5-284864, Japanese Utility Model No. 5-61058).

However, in the above-mentioned vibration generator, the permanent magnet which is In order to vibrate in the case, the repulsive force of the spring generated by the contact between the spring and the permanent magnet is used. For this reason, there is a limit to the frequency that the vibration generator can follow. In addition, since it is necessary to add the length of the cylindrical case to the vibration range by the number of turns of the spring as the length of the cylindrical case, there is a limit to miniaturization. In addition, there was a problem that the service life was limited due to the fatigue characteristics of the spring.

The present invention has been made in view of the above problems, and has as its object to provide a vibration generator that can vibrate up to a high frequency, and that can be downsized and have a long life. Disclosure of the invention

In order to achieve the above object, a first feature of the present invention is that a vibration generator of the present invention comprises: a permanent magnet movable in a passage formed in a housing; A coil for applying a driving force to the permanent magnet by applying a signal; and a magnetic repulsion unit provided on at least one side of the passage and applying a magnetic repulsive force to the proximity of the permanent magnet; It is equipped with.

According to the first feature of the present invention, in this vibration generator, a driving force is applied to the permanent magnet by the magnetic field of the coil each time a pulse is applied to the coil. The driving force causes the permanent magnet to move in the housing below the coil. In addition, the permanent magnet receives repulsion in the direction opposite to the direction of movement due to the magnetic force of the magnetic repulsion means as it moves right or left. Therefore, each time the coil is turned on or off, the position of the permanent magnet determines the direction of the force applied to the permanent magnet. As a result, the permanent magnet reciprocates in the housing in response to the ON / OFF of the coil, and vibrates even at a high frequency. In addition, a permanent magnet is housed in the housing, a repulsion means is provided at at least one end in the housing, and a drive coil for energizing a pulse is provided on the outer periphery of the housing. Then, the attractive force and the repulsive force of the drive coil and the repulsive force of the magnetic repulsive means act on the mover, which is a permanent magnet, to vibrate the permanent magnet. For this reason, power consumption is small and a small vibration generator can be manufactured at low cost. Further, since the movable permanent magnet does not come into contact with the magnetic repulsion means, a long-life vibration generator can be obtained.

A second feature of the present invention is that the coil includes at least two coils that apply a forward and a reverse magnetic field to the permanent magnet when a pulse signal is applied.

A third feature is that the magnetic repulsion means is composed of a permanent magnet disposed on one side of the housing.

A fourth feature is that the magnetic repulsion means is a permanent magnet, is disposed on both sides of the movable permanent magnet, and has different magnetic forces. A fifth feature is that the inner diameter of the housing is configured to be larger at the cylinder end than at the center of the cylinder, and a permanent magnet having an outer diameter larger than the inner diameter of the center of the cylinder is magnetically repelled within the cylinder end. That is, it was mounted as a means.

A sixth feature is that the magnetic repulsion means is composed of another coil different from a driving coil provided outside one end of the housing.

The seventh feature is that another coil different from the coil that provides the driving force turns ON in response to a request signal from the outside.

An eighth feature is that the casing has an arc shape in a side view. A ninth feature is that the pulse signal that applies a driving force to the coil is an alternating signal whose polarity alternates between positive and negative.

A tenth feature is that the movable permanent magnet is configured to move two permanent magnets in the axial direction. Are joined through a non-magnetic material.

A first feature is that a ventilation hole is provided for communicating the passage of the housing with the outside of the housing.

According to the eleventh feature, the permanent magnet hardly receives air resistance (movement resistance) when moving in the passage, the permanent magnet moves smoothly, and the magnetic efficiency with respect to the permanent magnet improves.

A first feature is that the ventilation holes are provided at both ends of the passage.

According to the first and second features, the permanent magnet is less susceptible to air resistance in the forward and return paths, and the magnetic efficiency for the permanent magnet is further improved.

A thirteenth feature is that the housing has a ventilation passage having a diameter larger than that of the movable permanent magnet in the vicinity of the magnetic repulsion means, and the ventilation hole is provided with the ventilation passage. Communication with the use passage.

According to the thirteenth feature, air can be efficiently taken in and out of the passage and the outside of the spool when the permanent magnet reciprocates.

A fourteenth feature is that the frequency of a pulse signal for applying a driving force to the coil is switched so as to increase stepwise as the operation time elapses.

According to the fourteenth feature, there is an effect that a soft vibration can be given to the owner and step-out can be prevented. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is an external perspective view of a vibration generator showing a first embodiment of the present invention. FIG. 2 is an internal structural view showing the vibration generator according to the first embodiment, partially cut away. FIG. 3 is a cross-sectional view of the vibration generator according to the first embodiment.

FIGS. 4A to 4C are diagrams showing positions of movable permanent magnets for explaining the operation principle of the vibration generator according to the first embodiment.

5A to 5D are diagrams showing positions of movable permanent magnets for explaining the operation principle of the vibration generator according to the first embodiment.

FIG. 6 is a diagram illustrating the force applied to the movable permanent magnet from the magnetic field of the coil and the magnetic field of the fixed permanent magnet for explaining the operation principle of the vibration generator according to the first embodiment.

FIG. 7 is a diagram illustrating the force applied to the movable permanent magnet from the magnetic field of the coil and the magnetic field of the fixed permanent magnet for explaining the operation principle of the vibration generator according to the first embodiment.

FIG. 8 is a diagram illustrating the force applied to the movable permanent magnet from the magnetic field of the coil and the magnetic field of the fixed permanent magnet for explaining the operation principle of the vibration generator according to the first embodiment.

FIG. 9 is an external perspective view of a vibration generator according to the second embodiment of the present invention. FIG. 10 is an internal structural diagram showing the vibration generator according to the second embodiment, partially cut away.

FIG. 11 is a cross-sectional view of the vibration generator according to the second embodiment.

FIG. 12 is a diagram showing a main part of a vibration generator according to a third embodiment of the present invention.

FIG. 13 is a diagram showing a schematic configuration of a vibration generator according to a fourth embodiment of the present invention.

FIG. 14 is a diagram illustrating a waveform applied to the coil of the vibration generator according to each of the above-described embodiments.

FIG. 15 is a cross-sectional view of a vibration generator provided with a shield plate. FIG. 16 is a diagram showing waveforms applied to a coil for describing a vibration generator according to a fifth embodiment of the present invention.

FIGS. 17A to 17D are diagrams showing positions of movable permanent magnets for explaining the operation principle of the vibration generator according to the fifth embodiment.

FIGS. 18A and 18B are diagrams showing positions of movable permanent magnets for explaining the operation principle of the vibration generator according to the fifth embodiment.

FIG. 19 is a diagram showing the force applied to the movable permanent magnet from the magnetic field of the coil and the magnetic field of the fixed permanent magnet for explaining the operation principle of the vibration generator according to the fifth embodiment.

FIG. 20 is a diagram showing the force applied to the movable permanent magnet from the magnetic field of the coil and the magnetic field of the fixed permanent magnet to explain the operation principle of the vibration generator according to the fifth embodiment.

FIG. 21 is a diagram illustrating a force applied to a movable permanent magnet from a magnetic field of a coil and a magnetic field of a fixed permanent magnet to explain the operation principle of the vibration generator according to the fifth embodiment.

FIG. 22 is a sectional view of a main part of a vibration generator according to a sixth embodiment of the present invention.

FIG. 23 is a side view of the vibration generator according to the sixth embodiment.

FIG. 24 is an end view of the vibration generator according to the sixth embodiment.

FIG. 25 shows the operation of the vibration generator according to the sixth embodiment.

FIG. 9 is a cross-sectional view of a main part for describing a normal state when the flip-flop is turned on.

FIG. 26 shows the operation of the vibration generator according to the sixth embodiment.

FIG. 3 is a cross-sectional view of a main part for describing the direction of magnetic flux when N is applied.

FIG. 27 shows the operation of the vibration generator according to the sixth embodiment.

FIG. 4 is a cross-sectional view of a main part for explaining movement of a movable permanent magnet when the position is changed to N. FIG. 28 is a fragmentary cross-sectional view for explaining the operation of the vibration generator according to the sixth embodiment, particularly, the movement of the movable permanent magnet when the switch is turned off. FIG. 29 is a cross-sectional view of the vibration generator when two drive coils are used. FIG. 30 is a diagram showing the magnetic field of the coil and the force applied to the movable permanent magnet from the fixed permanent magnet, for explaining the operation principle of the vibration generator.

FIG. 31 is a sectional view of a main part of a vibration generator according to a seventh embodiment of the present invention.

FIG. 32 is a side view of the vibration generator according to the seventh embodiment.

FIG. 33 is an end view of the vibration generator according to the seventh embodiment.

FIG. 34 is a sectional view of a main part of a vibration generator according to an eighth embodiment of the present invention.

FIG. 35 is a side view of the vibration generator according to the eighth embodiment.

FIG. 36 is an end view of the vibration generator according to the eighth embodiment.

FIG. 37 is a cross-sectional view of a vibration generator including a shield plate.

FIG. 38A and FIG. 38B are diagrams illustrating the operation of the vibration generator according to the ninth embodiment of the present invention.

FIG. 39 is a waveform diagram for explaining the vibration generator according to the ninth embodiment of the present invention.

FIG. 40 is a cross-sectional view showing a conventional vibration generator. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings of FIGS. 1 to 39.

FIG. 1 is an external perspective view of a vibration generator showing a first embodiment of the present invention. FIG. 2 is an internal structural view showing the vibration generator of FIG. 1 in a partially cutaway manner. Figure FIG. 3 is a sectional view of the vibration generator of FIG.

The vibration generator of the first embodiment includes a housing 1 which is a cylindrical body having an inner space 2, a fixed permanent magnet 3 fixed to one end of the inner space 2 of the housing 1, A fixed permanent magnet 4 fixed to the other end of the cavity 2, a movable permanent magnet 5 movably housed between the fixed permanent magnets 3, 4 of the inner cavity 2, and wound around the outer periphery of the housing 1. A driving coil 6, a pulse power supply 7 for generating a pulse signal at a predetermined cycle, and a terminal 8 for applying a pulse signal from the pulse power supply 7 and conducting electricity to the driving coil 6. . The fixed permanent magnet 3 and the fixed permanent magnet 4 have different magnetic forces, and the permanent magnet 3 has a larger magnetic force here. In this way, by making the magnetic force different, the movable permanent magnet 5 is located on the minus side when the drive coil 6 is not energized, so that the initial operation is smooth.

The housing 1 has an outer peripheral portion 1c around which the drive coil 6 is wound, and outer peripheral portions 1a, 1b around which the drive coil 6 is not wound. The outer peripheral portion 1c is set to have a smaller diameter than the outer peripheral portions 1a and 1. In this manner, the outer peripheral surface can be made substantially the same as the outer peripheral portions 1a and 1b in a state where the drive coil 6 is wound around the outer peripheral portion 1c. Therefore, a small-sized vibration generator having a small outer diameter can be obtained. The outer peripheral portion 1a is formed shorter in the axial direction than the outer peripheral portion 1b. An outer peripheral portion 1c is formed between the outer peripheral portions 1a and 1b.

In the case 1, the inside diameter of both ends of the case 1 to which the fixed permanent magnet 3 and the fixed permanent magnet 4 are fixed is set to be larger than the diameter of the inner space 2. Then, the fixed permanent magnets 3 and 4 having a large diameter and a short length are positioned on both sides of the housing 1. By doing so, a vibration generator having a short length can be obtained as a result. Next, the operation principle of the vibration generator according to the first embodiment will be described with reference to FIGS. 4A to 8.

In this vibration generator, the coil 6 is not energized by a pulse, and when the coil 6 is turned off, the movable permanent magnet 5 is fixed to the magnetic flux of the movable permanent magnet 5 and the fixed permanent magnets disposed so as to face both poles. It is located where the magnetic fluxes 3 and 4 are balanced [Position 1 in FIGS. 4A and 6].

6, 7, and 8, the horizontal axis indicates the position of the permanent magnet 5, and the intersection with the vertical axis, that is, the zero point indicates the position where the movable permanent magnet 5 balances when the coil is turned off. The vertical axis indicates the force that the movable permanent magnet 5 receives. Curve A represents the force that the movable permanent magnet 5 receives from the magnetic field of the coil 6. Curve B shows the force that the movable permanent magnet 5 receives from the magnetic field of the fixed permanent magnets 3 and 4 when the coil is turned off. Curve C shows the force that the movable permanent magnet 5 receives from the magnetic field of the coil and the magnetic field of the fixed permanent magnet when the coil is ON.

(1) When the movable permanent magnet 5 is present at the position shown in FIG. 4A, a pulse is applied to the coil 6 and when the coil 6 is turned on, the magnetic flux generated in the coil 6 causes the magnetic flux to be out of balance. Therefore, the movable permanent magnet 5 receives a force to the right at the position shown in FIG. 4A, and moves to a position where the magnetic flux is balanced (position の in FIGS. 4B and 6) with kinetic energy.

(2) Thereafter, the movable permanent magnet 5 moves until the kinetic energy Si is consumed [position 3 in FIGS. 4C and 6]. Kinetic energy have the movable permanent magnet 5, and the potential energy S ₂ of returning to a position ② in Fig. 6, the housing 1 moves (vibration) is used and energy.

(3) When energization of the coil 6 is turned off at the position (3) in Fig. 6, the magnetic flux balance position returns to the position (2) in Fig. 7 again. Accordingly movable permanent magnets 5 is given a potential energy S ₂ is greater than the potential energy S _3, the position of FIG. 7 ① Move to [Fig. 5A].

(4) Thereafter, the movable permanent magnet 5 moves to the position の [FIG. 5B] in FIG. 7 where the potential energy S ₃ is consumed. At this time, the potential energy S ₃ of the movable permanent magnet 5 is used for the potential energy S ₄ for returning to the position ① in FIG. 7 and the energy for moving the housing 1.

(5) When the coil is turned on at the position (1) in FIG. 7, the position of the magnetic flux balance moves to the position (2) in FIG. Thus the movable permanent magnet 5 is a profound E Nerugi one S ₅ from S _4, it moves the position ② until [Figure 5C] in FIG.

(6) Thereafter, the position ⑤ movable permanent magnet 5 until [Figure 5D] in FIG. 8 that consume energy S ₅ is moved. At this time, the energy S ₅ of the movable permanent magnet 5 is used for the potential energy S ₆ for returning to the position ② in FIG. 8 and the energy for moving the housing 1.

Thereafter, by repeating the above (3) to (6), the movable permanent magnet 5 repeats the reciprocating motion while increasing the energy, and the energy for moving the housing 1 increases accordingly. This energy saturates at a certain point and performs stable oscillation. Thus, the movable permanent magnet 5 vibrates in the housing 1.

FIG. 9 is an external perspective view of a vibration generator according to the second embodiment of the present invention. FIG. 10 is an internal structural diagram showing the vibration generator of FIG. 9 in a partially cutaway manner. FIG. 11 is a cross-sectional view of the vibration generator shown in FIG.

The vibration generator according to the second embodiment includes a housing 1 which is a cylindrical tube having an inner space 2, a fixed permanent magnet 3 fixed to one end of the inner space 2 of the housing 1. , A fixed permanent magnet 4 fixed to the other end of the inner space portion 2, a movable permanent magnet 5 movably housed between the fixed permanent magnets 3, 4 of the inner space portion 2, and an outer periphery of the housing 1. A driving coil 6 wound around the motor, a pulse power supply 7 for generating a pulse signal at a predetermined cycle, and a pulse signal from the pulse power supply 7 And a terminal 8 for energizing the battery. In this respect, it is similar to that of the first embodiment. The difference between the vibration generator according to the second embodiment and the vibration generator according to the first embodiment is that the movable permanent magnet 5 is connected to two permanent magnets 5a and 5b by combining them. And a non-magnetic joining member 5c which is formed in an intended manner. Note that the inner diameter of the housing 1 is the same, and the outer circumference has a larger outer diameter at the portion where the drive coil 6 is wound, but this may be the same as in the first embodiment.

In the vibration generator according to the second embodiment, when the pulse signal is supplied from the pulse power source 7 to the drive coil 6 when the movable permanent magnet 5 is present at the position shown in FIG. 11, the left side of the drive coil 6 The N pole and the S pole are on the right. The movable permanent magnet 5 that is moving to the right in response to the fixed permanent magnet 4 before energization moves the S pole of the permanent magnet 5 b by the N pole of the electromagnetic coil 6 and moves to the right. Since the energization by the pulse signal of the pulse power supply 7 is immediately turned off, the sucked movable permanent magnet 5 moves rightward as it is. However, when approaching the fixed permanent magnet 3, its N pole and the N pole of the permanent magnet 5a repel each other, and the repulsive force causes the movable permanent magnet 5 to move to the left. When the S pole of the permanent magnet 5 a forming the movable permanent magnet 5 approaches the left end of the drive coil 6 due to the repulsive force, pulse current is applied to the drive coil 6. As a result, the N pole of the drive coil 6 and the S pole of the permanent magnet 5a have already attracted each other, and the movable permanent magnet 5 attempts to move further to the left due to this attractive force. Then, since the energization of the drive coil is immediately turned off, the movable permanent magnet 5 moves to the left without being affected by the magnetic force of the drive coil 6. However, when the N pole of the permanent magnet 5 b approaches the N pole of the fixed permanent magnet 4, the repulsion of both causes the movable permanent magnet 5 to move rightward again. In this way, the reciprocating movement of the movable permanent magnet 5 in the inner space 2, that is, the vibration is maintained. In this second embodiment According to such a vibration generator, the movement of the movable permanent magnet 5 in both the left and right directions is promoted by the pulse conduction of the drive coil 6.

FIG. 12 is a diagram showing a housing of a vibration generator according to a third embodiment of the present invention. The basic configuration as a vibration generator is the same as in the first embodiment. The feature of the vibration generator according to this embodiment is that the shape of the housing 1 is an arc shape in a side view using a part of a donut-shaped housing. As a result, not only the horizontal direction but also the vertical direction in the figure can be set as the vibration range.

FIG. 13 is a view showing a vibration generator according to a fourth embodiment of the present invention. The feature of the vibration generator according to the fourth embodiment is that a coil is used instead of the fixed permanent magnet of the vibration generator according to the first embodiment. In FIG. 13, a second coil 13 and a third coil 14 are provided at both ends of the housing 1. It differs from that of the first embodiment in that a movable permanent magnet 5 is provided in the inner space 2 of the housing 1 and a coil 6 is provided on the outer periphery of the housing 1 and is energized and excited by a pulse generator 7. There is no place. In the case where the mobile phone is attached to a mobile phone, when a telephone call is made, the second and third coils 13 and 14 are continuously energized by the DC power supply 10. During energization, the second coil 13 performs the same function as the fixed permanent magnet 3, and the third coil 14 performs the same function as the fixed permanent magnet 4. The vibration action may be considered to be similar to that of the first embodiment.

In the vibration generator of each of the above-described embodiments, the pulse signal applied to the coil 6 is a voltage of 0 (V) to (V) as shown in FIG. However, in this drive signal waveform, a magnetic flux corresponding to the voltage (V) is generated in the coil 6, and the magnetic flux <^ leaks outside. As a result, when a portable terminal equipped with the vibration generator is placed near a magnetic card, the magnetic information on the magnetic card may be destroyed. As a countermeasure, it is conceivable to cover the entire outer periphery of housing 1 with shield 15 as shown in Fig. 15. Can be In this case, a thick shield plate must be used to shield the large magnetic flux, resulting in a large vibration generator. This is inconsistent with the demand for smaller mobile terminals equipped with vibration generators, and the need for smaller vibration generators accordingly.

Therefore, in the vibration generator according to the fifth embodiment of the present invention, the pulse voltage applied to the drive coil of the vibration generator according to each of the above-described embodiments is changed from the waveform shown in FIG. 14 to the waveform of the voltage O Ei iV). In order to obtain the same amount of vibration as-, the alternating voltage in Fig. 16 that changes from l / S Ei to l / 2 Ei may be used. In this case, the amount of magnetic flux generated from coil 6 is 1/2 of that in the case of voltage (V). Accordingly, the thickness of the shield plate 15 can be reduced, and the vibration generator can be downsized.

Next, the principle of operation of the vibration generator when an alternating voltage as shown in FIG. 16 is applied to the coil 6 will be described.

When the coil 6 is OFF, the movable permanent magnet 5 is located where the magnetic flux of the movable permanent magnet 5 and the magnetic flux of the fixed permanent magnets 3 and 4 arranged to oppose both poles are balanced (Fig. 17). A and position i in Figure 19).

(1) When a voltage of +1/2 E is applied to the coil 6, the magnetic flux generated in the coil causes the magnetic flux to lose its balance. For this reason, the movable permanent magnet 5 receives a force in the direction of the arrow shown in FIG. 17A, is given kinetic energy S to a position where the magnetic flux is balanced (position ② in FIG. 19), and moves.

(2) Thereafter, the movable permanent magnet 5 moves until the kinetic energy S i is consumed (position ③ in FIGS. 17B and 19). Exercise energy S i had a movable permanent magnet 5, and the potential energy S ₂ of returning to a position ② in Fig. 1 9 is used and the energy to move the housing 1. (3) When the movable permanent magnet 5 is at the position (3) in Fig. 19 and a voltage of-1/2 E is applied to the coil, the position of the magnetic flux is shifted from the zero point to the position (2) in Fig. 20, and the movable The permanent magnet 5 is given a potential energy of S ₃ larger than S ₂ and moves toward the right side.

(4) at the position ④ in FIG. 20, again applying a voltage of + 1/2 E to the coil, the movable permanent magnet 5 moves to the position ⑥ to consume S _3. The energy S 3 possessed is used for potential energy S ₄ for returning to the position ② in FIG. 19 and energy for moving the housing 1.

(5) When a voltage of -1/2 E is applied to the coil at the position の in FIG. 20, the position of the magnetic flux is shifted to the position の in FIG. 21 again, whereby the movable permanent magnet 5 is moved from S ₄ given the energy of the large S _5, moves to the left.

(6) When a voltage of +1/2 E is again applied to the coil 6 at the position (1) in FIG. 21, the movable permanent magnet 5 moves to the position ( ₅ ) where S5 is consumed. The energy S _{5 held} is used for the potential energy S ₆ for returning to the position の in FIG. 21 and the energy for moving the housing 1.

Thereafter, by repeating the steps (3) to (6), the energy of the movable permanent magnet 5 increases and reciprocates while repeating the reciprocating movement. As a result, the energy for moving the housing 1 increases. Thus, the movable permanent magnet 5 vibrates in the housing 1.

FIG. 22 is a sectional view of a main part of a vibration generator according to a sixth embodiment of the present invention, FIG. 23 is a diagram showing the side surface portion, and FIG. 24 is a diagram showing the same end surface portion. The vibration generator includes a spool 1 which is a cylindrical cylinder having a passage 2 which is an inner space therein, a movable permanent magnet 5 movable in the passage 2 of the spool 1, and a periphery of the spool 1. A magnetic field that gives an attractive force to one magnetic pole side (here, the N pole side) of the movable permanent magnet 5 is generated by applying a pulse signal. Coils 6a and 6b, which are magnetic field generating means for generating a magnetic field that gives a repulsive force to the other magnetic pole side (here, the S pole side), and movable permanent magnets provided at both ends of the passage 2 5 is provided with fixed permanent magnets 3 and 4 which are repulsive means for applying a repulsive force to the proximity of 5, and ventilation holes 21 and 22 for communicating the passage 2 with the outside of the spool 1.

The movable permanent magnet 5 has a columnar shape, and the left side of the drawing has an N pole and the right side has an S pole. At both ends of the passage 2, that is, at both ends of the spool 1, holding plates 3 a and 4 a of permanent magnets are fixed so as to close the openings at both ends of the passage 2. Disk-shaped fixed permanent magnets 3 and 4 are fixed to the holding plates 3 a and 4 a so as to face the movable permanent magnets 5. The fixed permanent magnet 3 has an S pole on the left and an N pole on the right. The fixed permanent magnet 4 has an S pole on the left and an N pole on the right. The magnetic poles of the movable permanent magnet 5 and the fixed permanent magnets 3 and 4 are set so as to repel each other. Of course, the magnetic poles may be opposite to those shown in the figure.

The coils 6a, 6b are wound around bobbin equivalent portions on both sides of the center of the spool 1, but the winding directions are opposite to each other and are connected in series. The coils 6 a and 6 b are connected to a pair of coil terminals 23 inserted into a through hole 20 formed in the center of the spool 1. Therefore, a pulse signal is supplied to the coils 6a and 6b through the coil terminals 23. Here, when the coils 6a and 6b are energized, an N-pole magnetic field is generated on the left side of the coil 6b and an S-pole magnetic field is generated on the right side, while an S-pole magnetic field is generated on the left side of the coil 6a. A magnetic field is generated, and a magnetic field of N pole is generated on the right side. Therefore, an attractive force is applied to the N pole side of the movable permanent magnet 5 and a repulsive force is applied to the S pole side.

The ventilation holes 21 and 22 are provided at both ends of the passage 2 and open from the outer peripheral surface (side peripheral surface) of the spool 1 to the outside of the spool 1. In this embodiment, the spool 1 is provided near the fixed permanent magnets 3 and 4 for ventilation of a diameter larger than the diameter of the passage 2. It has passages 2a and 2b. The ventilation holes 21 and 22 communicate with the ventilation passages 2'a and 2b. Also, four vent holes 21 and 22 are provided at equal angle (90 °) intervals. Accordingly, the passage 2 communicates with the outside of the spool 1 through the ventilation passages 2a and 2b and the ventilation holes 21 and 22 at both ends.

Next, the operation of the vibration generator according to the present embodiment configured as described above will be described with reference to FIGS. 25 to 28, a switch 30 equivalently indicates ON / OFF of the pulse signal. When switch 30 is ON, it indicates that the pulse signal is being supplied. The pulse signal is, for example, a voltage OE ^ V) as shown in FIG. 14 and has the same ON period and OFF period.

The switch 30 is normally OFF as shown in FIG. Therefore, based on the relationship between the magnetic poles of the movable permanent magnet 5 and the magnetic poles of the fixed permanent magnets 3 and 4 shown in FIG. Here, when the switch 30 is turned on as shown in FIG. 26, as described above, the magnetic field of the N pole is generated on the left side of the coil 6 and the S pole is generated on the right side, while the S pole is generated on the left side of the coil 6a and the magnetic field is generated on the right side. An N-pole magnetic field is generated. As a result, the magnetic flux directions of the magnets 3, 4, and 5 are in the lower arrow direction, and the magnetic flux directions of the coils 6a and 6b are in the upper arrow direction. If the direction of the magnetic flux is the same, the attractive force acts, and if the direction is the opposite, the repulsive force acts. As a result, the movable permanent magnet 5 moves to the left side of the drawing as shown in FIG. Then, when the movable permanent magnet 5 approaches the fixed permanent magnet 4, the switch 30 is turned off.

The movable permanent magnet 5 and the fixed permanent magnet 4 have N poles facing each other. Therefore, when the movable permanent magnet 5 approaches the fixed permanent magnet 4, the movable permanent magnet 5 moves rightward due to the repulsive force as shown in FIG. And movable eternal When the permanent magnet 5 approaches the fixed permanent magnet 3, the S poles of the movable permanent magnet 5 and the fixed permanent magnet 3 face each other, so that the movable permanent magnet 5 moves to the left due to the repulsive force. When the movable permanent magnet 5 reaches almost the center of the passage 2, the switch 30 is turned on again, and the movable permanent magnet 5 is accelerated to the left as described above. By repeating the movement of the movable permanent magnet 5, vibration is amplified and generated, and the entire vibration generator vibrates.

On the other hand, when the movable permanent magnet 5 reciprocates, air enters and exits between the passage 2 and the outside of the spool 1 through the ventilation holes 21 and 22, so that the movable permanent magnet 5 is less likely to receive air resistance and moves smoothly. I do. That is, when the movable permanent magnet 5 moves to the left side, the left side of the passage 2 with the movable permanent magnet 5 interposed therebetween tends to have a positive pressure, and the right side has a negative pressure. However, the air on the left side of the passage 2 flows out of the spool 1 through the ventilation hole 21, and the air on the right side of the passage 2 flows out of the spool 1 through the ventilation hole 22. When the movable permanent magnet 5 moves to the right, the opposite effect occurs.

In particular, ventilation holes 21 and 22 are provided at both ends of the passage 2. For this reason, for example, as compared with the case where the movable permanent magnet 5 is provided only on one end side, the movable permanent magnet 5 is less susceptible to air resistance in the forward path and the return path, and the magnetic efficiency for the movable permanent magnet 5 is further improved. Further, the ventilation holes 21 and 22 are provided in the ventilation passages 2 a and 2 b having a diameter larger than the diameter of the passage 2. For this reason, air can flow in and out more efficiently hydrodynamically than, for example, a ventilation passage having a diameter smaller than the diameter of the passage 2. FIG. 29 has the same structure as FIG. 28, and operates in the same manner. The principle of operation of the vibration generator according to the above embodiment can also be explained from the change in the force applied to the movable permanent magnet due to the current flowing through the coil of 0 N / 0 FF. In the case of one coil, it is as described in FIGS.

When one coil is used, the movable permanent magnet 5 The force received is as shown by curve A in Figure 6. As shown in FIG. 6, the force received by the movable permanent magnet 5 is largest at the end position on the left side from the point 0, and decreases on the right side from the point 0. Further, beyond the position の in FIG. 6, the magnetic field of the coil exerts a force in a direction that hinders the driving of the movable permanent magnet 5. For this reason, on the left side of the point 0, the energy applied to the movable permanent magnet 5 due to the ON / OFF of the coil greatly increases. On the right side of the zero point, the energy applied to the movable permanent magnet 5 does not increase much. In other words, in the case of a single coil, the force that the movable permanent magnet 5 receives from the magnetic field of the coil shown on the left side of the curve A at point 0 is mainly used (that is, the pole surface on one side of the movable permanent magnet 5). Can utilize the magnetic flux). On the other hand, when two coils are used, as shown in Fig. 29 (similar to Fig. 22), two coils 6a are used so that the magnetic fluxes of the adjacent coils 6a and 6b face each other. , 6b, the force received by the movable permanent magnet 5 from the magnetic field of the coil becomes as shown by the curve A in FIG. The force received by the movable permanent magnet 5 does not decrease as shown by the curve A in FIG. 6 even on the right side of the point 0, and no force is generated in the direction that hinders the driving of the movable permanent magnet 5. Therefore, the energy applied to the movable permanent magnet 5 by turning on and off the coil is large on the left and right sides of the zero point, and the force received by the movable permanent magnet 5 from the magnetic field of the coil can be used effectively (that is, , The pole faces of the movable permanent magnet 5 are available). Therefore, a greater force can be obtained than when one coil is used.

FIG. 31 is a sectional view of a main part of a vibration generator according to a seventh embodiment of the present invention, FIG. 32 is a side view thereof, and FIG. 32 is an end view thereof. However, the same elements are denoted by the same reference numerals. This vibration generator has the same structure as that shown in FIG. 22 except that the form of the ventilation holes 21 and 22 is different. That is, the ventilation holes 21 and 22 do not open from the outer peripheral surface of the spool 1 but hold the fixed permanent magnet. The holding plates 3a and 4a open to the outside of the spool 1. The air holes 21 and 22 here have a slit shape formed at equal angular intervals as shown in FIG. The air inflow / outflow action caused by the reciprocating motion of the movable permanent magnet 5 is the same as that in the sixth embodiment.

FIG. 34 is a sectional view showing a principal part of a vibration generator according to an eighth embodiment of the present invention. FIG. 35 shows the same side view, and FIG. 36 shows the same end view. This vibration generator also differs only in the form of the ventilation holes 21 and 22. The ventilation holes 21 and 22 are open from the outer peripheral surface of the spool 1, and are not circular as shown in FIG. 23 but are squares having a large opening area. The air entry / exit action is the same as above.

In the vibration generators according to the sixth, seventh, and eighth embodiments in which two coils are used as the drive coils, the pulse signals applied to the coils 4 and 5 are as shown in FIG. 0 (V) to E, (V). However, in this drive signal waveform, the leakage of the magnetic flux to the outside becomes large for the same reason as when one coil is used as the drive coil, and there is a possibility that the magnetic information of the magnetic card is destroyed. As a countermeasure, it is conceivable to cover the entire outer periphery of the housing 1 with the shield 15 as shown in FIG. In this case, it is necessary to use a thick shield plate in order to shield a large magnetic flux, and as a result, the vibration generator becomes large. In this case, portable terminals equipped with vibration generators are being miniaturized more and more, which contradicts the demand for smaller vibration generators.

Therefore, the pulse voltage applied to the vibration generator of each of the sixth, seventh, and eighth embodiments obtains the same amount of vibration as the waveform of voltage 0 → E i (V) as shown in FIG. Therefore, the alternating voltage may be changed from / to E E, (the ninth embodiment). In this case, the amount of magnetic flux generated from the coils 6a and 6b is 1/2 that of the case of 0 → Έ, (V). Shield board 1 5 accordingly The thickness can be reduced and the vibration generator can be downsized.

In this vibration generator, when the signal shown in FIG. 16 is applied to the coils 6a and 6b while changing from +1/2 V- -1/2 V to +1/2 V, the movable permanent magnet 5, the position changes as shown in Fig. 38A → Fig. 38B → Fig. 38A → Fig. 38B. Therefore, the movable permanent magnet 5 reciprocates in the passage 2, and a part of the energy is transmitted to the housing and vibrates.

In addition, in each embodiment, the application of the pulse signal to the drive coil is performed by receiving a signal based on a call in the case of a mobile phone or the like.

Note that the pulse signal given to the drive coil in each of the above embodiments has a duty ratio of 1: 1 as shown in FIG. 14, and has a constant frequency. If the frequency is increased in each of the above-mentioned vibration generators, the vibration energy will increase, but the maximum vibration will be obtained at about 130 Hz from the relationship with the amount of human perceived vibration.

In addition, these vibration generators have a maximum continuous response frequency and a maximum self-starting frequency. The maximum continuous response frequency is the frequency of the drive voltage pulse for obtaining the so-called maximum vibration amount, which is about 130 Hz for this vibration generator. Exceeding or rapidly increasing the frequency will cause loss of synchronism and the amount of vibration will drop sharply. The maximum self-starting frequency is the frequency at which step-out does not occur even if driving is suddenly started at that frequency. Naturally, only vibration lower than the maximum continuous response frequency vibration can be obtained. In this vibration generator, it is about 110Hz.

When a vibration generator is used in a mobile phone, it vibrates suddenly at the maximum continuous response frequency, and when the holder suddenly receives this large vibration, the stimulation is too strong. Also, suddenly rising to the maximum continuous response frequency may cause step-out. is there. Therefore, as in the vibration generator according to the tenth embodiment, the frequency of the pulse signal applied to the drive coil 6 is 105 Hz as shown in FIG. 39, and the next five pulses are 120 Hz as shown in FIG. Then, the next 5 pulses are at 125 Hz, and the continuous oscillation may be 130 Hz at the end, and the frequency may be increased step by step.

With this vibration generator, the vibration is weak at the start of the vibration and gradually increases, so that soft vibration is given to the holder and the stimulation is not intense. In addition, since the frequency of the vibration increases from the maximum self-starting frequency, no step-out occurs even at the maximum continuous response frequency. Industrial applicability

The vibration generator according to the present invention may be applied to the vibration generator of another embodiment regardless of the above-described embodiment.

Claims

The scope of the claims

1. A permanent magnet movable in a passage formed in the housing;

A coil wound around the passage and applying a driving force to the permanent magnet by energizing a pulse signal;

Magnetic repulsion means provided on at least one side of the passage, and for applying a magnetic repulsive force to the proximity of the permanent magnet;

A vibration generator comprising:

2. The vibration generator according to claim 1, wherein the coil includes at least two coils for applying a forward and a reverse magnetic field to the permanent magnet by applying a pulse signal.

3. The vibration generator according to claim 1, wherein the magnetic repulsion means is a permanent magnet disposed on one side of a housing.

4. The vibration generator according to claim 1 or 2, wherein the magnetic repulsion means is a permanent magnet, is disposed on both sides of the movable permanent magnet, and has different magnetic forces. .

5. The casing is configured such that the inner diameter is larger at the end of the cylinder than at the center of the cylinder, and a permanent magnet having an outer diameter larger than the inner diameter of the center of the cylinder is provided inside the end of the cylinder as magnetic repulsion means. 5. The vibration generator according to claim 3, wherein the vibration generator is mounted.

6. The vibration generator according to claim 1, wherein the magnetic repulsion means is another coil different from the coil that provides the driving force and that is provided outside one end of the housing.

7. The vibration generator according to claim 4, wherein another coil different from the coil providing the driving force is turned ON in response to a request signal from the outside.

8. The casing according to claim 1, wherein the casing has an arc shape in a side view. The vibration generator according to any one of claims 1 to 7.

9. The vibration generator according to any one of claims 1 to 8, wherein the pulse signal that applies a driving force to the coil is an alternating signal whose polarity changes alternately between positive and negative.

10. The movable permanent magnet according to any one of claims 1 to 9, wherein the movable permanent magnet is formed by joining two permanent magnets in the axial direction via a non-magnetic material. Vibration generator.

11. The vibration generator according to any one of claims 1 to 10, further comprising a ventilation hole communicating the passage of the housing and the outside of the housing.

12. The vibration generator according to claim 11, wherein the ventilation holes are provided at both ends of the passage.

13. The housing has a ventilation passage having a diameter larger than a movable permanent magnet passage diameter in the vicinity of the magnetic repulsion means, and the ventilation hole communicates with the ventilation passage. 10. The vibration generator according to claim 10, wherein:

14. The vibration according to any one of claims 1 to 13, wherein the pulse signal for applying a driving force to the coil is switched such that a frequency increases stepwise with the elapse of an operation time. Generator.