JP3833607B2 - Vibration generator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibration generator.
[0002]
[Prior art]
Conventionally, for example, in a mobile device such as a mobile phone which is a terminal of a mobile communication device, a vibration generator is stored in the mobile device itself or an accessory instead of notifying the incoming call by a ringing tone. There is something that causes the human body to detect incoming calls by vibrating.
[0003]
A conventional vibration generator of this type has a structure in which a weight whose center of gravity is eccentric with respect to the rotation shaft is attached to the rotation shaft of the motor, and vibration is generated by rotating this weight. (See FIG. 4 of Patent Document 1).
[0004]
However, the vibration generator having such a structure uses the vibration of the rotating shaft when rotating the weight attached eccentrically as vibration, so that the bearing portion of the rotating shaft of the motor is subjected to severe force. There was a problem of impeding durability and reliability.
[0005]
In addition, these rotary motor type vibration generators vibrate to make the human body sense incoming calls, but the sensitive frequency that the human body senses is around 100 Hz, and when it exceeds 150 Hz, it can not be sensed, and the maximum number of rotations is 8000 rpm. There is a limit to the means for increasing the rotational speed as a method for increasing the vibration acceleration as a stimulus to the human body.
[0006]
On the other hand, if the same stimulus is given as a stimulus to the human body in order to make the human body sense the incoming call, it will no longer be a stimulus, so it is necessary to continuously give a fresh vibration stimulus, but the rotary motor type vibration generator is a direct current Since this is a motor, a constant voltage is applied, and it is difficult to vary the voltage because a control system is added. For this reason, as shown in FIG. 13, in the conventional rotary motor type vibration generator, the time for intermittently passing the current to the motor is controlled and patterned to continuously give a fresh vibration stimulus. However, this method has a problem that it lacks freshness because it only changes the time during which the vibration acceleration value at a predetermined vibration frequency is intermittent. In addition, the frequency that the human body can detect is different depending on the person (physique, body shape, etc.). Therefore, if only a certain vibration frequency can be applied, the vibration frequency that is optimal for the person who uses the vibration generator is not necessarily detected. There was also a problem that it could not be granted.
[0007]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-180186 [Patent Document 2]
Japanese Patent Laid-Open No. 2002-210411
[Problems to be solved by the invention]
The present invention has been made in view of the above points, and its purpose is to vibrate that can supply vibrations at a frequency of optimum sensitivity to any individual human body and can continuously provide fresh vibration stimulation. It is to provide a generator.
[0009]
[Means for Solving the Problems]
In order to solve the above problem, the vibration generator according to claim 1 of the present application has a mover to which a permanent magnet is attached, and an end face facing the end face of the mover via a predetermined gap, A stator that forms a magnetic path with the mover by exciting the attached coil with an electric current, and one end of the wire is attached to the mover side and the other end is attached to the stator side so that the mover is substantially In a vibration generator comprising a pair of elastic support members that are supported so as to vibrate linearly, by passing a frequency-modulated current through the coil, the vibration acceleration of the mover vibration is changed , and the coil is applied to the coil. The frequency-modulated current that flows is a predetermined frequency centered on the resonance frequency of the mover determined by the elastic force generated by the pair of elastic support members and the magnetic attraction / repulsion force acting between the mover and the stator. Around the frequency amplitude A number modulated current, thereby together to generate a multiple of the vibration acceleration change of the modulation period, characterized by a different vibration acceleration values alternately reduction of vibration acceleration values.
[0011]
The vibration generator according to claim 2 of the present application has a mover to which a permanent magnet is attached and an end face facing the end face of the mover with a predetermined gap, and current is passed through the attached coil. A stator that forms a magnetic path between the mover and the mover is excited, and one end of the wire is attached to the mover side and the other end is attached to the stator side so that the mover can be vibrated substantially linearly. In the vibration generator comprising a pair of elastic support members, the frequency-modulated current flowing in the coil is changed while flowing the frequency-modulated current in the coil to change the vibration acceleration of the vibration of the mover. The frequency amplitude is set to a predetermined initial value with the resonance frequency of the mover determined by the elastic force of the pair of elastic support members and the magnetic attraction / repulsion force acting between the mover and the stator as the center frequency. Gradually narrow from amplitude The current is frequency-modulated with a modulation period that converges to the resonance frequency, thereby generating a vibration acceleration change that is twice the modulation period, and the maximum vibration acceleration value by converging to the resonance frequency at the end of the frequency modulation period. It is characterized by giving.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a perspective view of a vibration generator 1 according to an embodiment of the present invention, FIG. 2 (a) is a front view, FIG. 2 (b) is a side view, and FIG. 3 is an exploded perspective view. As shown in these drawings, the vibration generator 1 is configured such that a movable element 50 is supported by two elastic support members 80 and 80 on an upper portion of a stator 10. Each component will be described below.
[0015]
The stator 10 is configured by attaching a coil 30 with a core and two elastic bodies 40 and 40 on a base 20 with a terminal made of a synthetic resin material. Terminal plates 23 and 23 are attached to both sides of the lower surface of the base 20 with terminals.
[0016]
The cored coil 30 is formed by winding a coil 33 around a coil core 31 made of a substantially rod-shaped iron sintered body. The coil 30 with a core is mounted on the base part 20 with a terminal, and at that time, the coil end parts 35 and 35 are connected to the connection parts 231 and 231 of the terminal plates 23 and 23 exposed inside the base part 20 with a terminal. Fixed.
[0017]
The elastic bodies 40, 40 are made of thin rubber plates, and are formed in shapes that can be placed on the elastic body mounting portions 211, 211 of the base portion with terminal 20, respectively.
[0018]
Next, each of the elastic support members 80 and 80 is a so-called double torsion type coil spring formed by bending a single wire, and each of the two coil portions 81 and 81 wound around approximately one and a half turns. Two substantially parallel arm portions 83, 83 and arm portions 85, 85 are projected from each other, and the arm portions 83, 83 extending in one direction are connected by an end portion (hereinafter referred to as "connecting portion") 82. The other arm portions 85 and 85 are configured as end portions (hereinafter referred to as “locking end portions”) 87 and 87 by bending the tips.
[0019]
FIG. 4 is an exploded perspective view of the mover 50. As shown in the figure, in the mover 50, a weight 60, a permanent magnet 70, and a high permeability member (hereinafter referred to as “center yoke”) 75 are attached to a mover yoke 51 made of the same material as the coil core 31. Configured.
[0020]
The mover yoke 51 has a substantially quadrangular prism shape (bar shape) and is provided with arm portions 52 and 52 extending toward the stator 10 at both ends thereof, and is formed in a substantially “U” shape as a whole. The inner side surfaces of the coil core 31 are tapered end surfaces 53 and 53 facing the end surfaces 37 and 37 of the coil core 31 with a predetermined gap, and the elastic support members 80 and 80 are connected to both outer side surfaces of the arm portions 52 and 52. Locking portions 55 and 55 each having a notch that bends in an L shape for locking the portions 82 and 82 are provided.
[0021]
The weight 60 is made of a nonmagnetic material, and a storage portion 61 into which the permanent magnet 70 is fitted is provided at the center thereof. The permanent magnet 70 is a rectangular plate member, and the upper and lower surfaces thereof are configured as SN magnetic poles. The vertical and horizontal dimensions of the surface of the permanent magnet 70 are formed to be substantially the same as the vertical and horizontal dimensions of the upper surface of the coil 33, and are formed in a dimension shape that just covers the upper surface of the coil 33. The center yoke 75 is a thin quadrilateral plate member, and is composed of a high permeability member in order to collect magnetic flux on the plate member.
[0022]
The mover 50 is assembled by inserting the permanent magnet 70 into the storage portion 61 of the weight 60 in the state where the fitting portion 63 of the weight 60 is fitted at the center of the lower surface of the mover yoke 51, and the center yoke 75 below it. It is done by attaching.
[0023]
Next, in order to assemble the vibration generator 1, in FIG. 3, the locking ends of the elastic support members 80, 80 are attached to the spring end fixing portions 217, 217 of the stator 10 to which the cored coil 30 and the elastic bodies 40, 40 are attached. The portions 87 and 87 are inserted, and at the same time, the arm portions 85 of the elastic support members 80 and 80 are locked to the spring locking portions 219 of the stator 10. By fixing the locking end portions 87 and 87 of the elastic support members 80 and 80 and the arm portion 85 in this way, the coil portions 81 and 81 are in contact with the elastic body 40 in a state of being slightly repressed, thereby elastically The support members 80 and 80 are reliably supported at three points. Then, the coupling portions 82 and 82 of the elastic support members 80 and 80 are inserted and locked into the locking portions 55 and 55 of the mover 50, whereby the vibration generator 1 shown in FIGS. 1 and 2 is completed.
[0024]
The mover 50 is supported by the elastic support members 80 and 80 so as to vibrate in the direction of magnetization of the stator 10 by the coil 33 (that is, in the left-right direction in FIG. 2A). At this time, the magnetic pole surface on the side where the center yoke 75 of the permanent magnet 70 is attached is disposed through a gap that faces the outer peripheral side surface of the coil 33, and the facing surfaces are configured to be parallel.
[0025]
The magnetic path of the vibration generator 1 configured as described above enters the coil core 31 through the outer peripheral side surface of the coil 33 from the magnetic pole surface to which the center yoke 75 of the permanent magnet 70 is attached, as shown by a one-dot chain line in FIG. In the coil core 31, the coil 33 is guided so as to face the magnetization direction (NS magnetic pole direction) of the stator 10, and further passes from the both end surfaces 37, 37 of the coil core 31 to the both end surfaces 53, 53 of the mover 50 through a gap. It is formed so as to return to the other magnetic pole surface of the permanent magnet 70 again from the center of the entering mover yoke 51.
[0026]
The vibration generator 1 is placed on a circuit board (not shown), and a terminal plate 23 of the base portion 10 with terminals is brought into contact with a circuit pattern (terminal pattern) provided on the circuit board so that a low melting point metal, etc. Secure the connection electrically and mechanically. When a predetermined current is passed through the coil 33 from the circuit board side (not shown), the mover 50 starts a single vibration to the left and right. The principle will be described below.
[0027]
First, FIG. 5 is a diagram showing the relationship between the lateral displacement X (mm) of the mover 50 and the lateral thrust F (N) acting on the mover 50. The thrust F indicates a rightward force in FIG. 2A when positive, and a leftward force when negative. Further, the displacement X indicates a displacement in the right direction in FIG. 2A when it is positive, and indicates a displacement in the left direction when it is negative.
[0028]
The thick dotted line in FIG. 5 indicates the resultant state of the magnetic force of the permanent magnet 70 and the elastic force generated by the elastic support members 80 and 80 when no current flows through the coil 33, and the solid line indicates NI = + 0.35 (N ) Represents the resultant state obtained by adding the magnetic force of the permanent magnet 70 and the elastic force of the elastic support members 80 and 80 to the electromagnetic force when the current of () is passed, and the thin dotted line represents NI = −0.35 in the coil 33. A state of a resultant force obtained by adding the magnetic force of the permanent magnet 70 and the elastic force of the elastic support members 80 and 80 to the electromagnetic force when the current of (N) is passed is shown.
[0029]
As shown in the figure, in any state, the thrust applied to the mover 50 is substantially linear, which indicates that the mover 50 is in a state suitable for simple vibration. The reason for this thrust is as follows.
[0030]
That is, as indicated by the line a in FIG. 6, the thrust force generated only by the elastic support members 80 and 80 becomes a force for linearly returning the mover 50 to the neutral position as the amount of displacement increases. On the other hand, as shown by the line b in FIG. 6, the thrust by the permanent magnet 70 alone is the thrust in the opposite direction to the thrust of the elastic support members 80 and 80, and hardly works when the displacement is small, and the displacement increases and the left and right When any gap becomes smaller, it increases rapidly toward the smaller one. Therefore, when the thrusts of the lines a and b in FIG. 6 are combined, a substantially linear thrust as shown by the line c in FIG. 6 is obtained. The reason why only the permanent magnet 70 is shown by the line b in FIG. 6 is that both end faces 53 and 53 of the mover 50 are S poles, and therefore the mover 50 is in the neutral position. This is because they are not sucked to the left or right. However, when any one of the end faces 53 approaches one of the end faces 37 of the stator 10, the thrust to be attracted to the end face 37 increases exponentially. As described above, since the thrust generated only by the permanent magnet 70 is small in the vicinity of the neutral point, the mover 50 is moved to the neutral position when no current is passed through the coil 33 even if the resilient force of the elastic support members 80 and 80 is not increased so much. It is easy to keep it in a state of being held in the container.
[0031]
When a current of NI = + 0.35 (N) is passed through the coil 33 to excite NS magnetic poles on the left and right end faces 37, 37 of the stator 10, the permanent magnet 70 and the elastic support member 80 as shown in FIG. , 80 becomes the thrust in a state of being translated in the upward direction with a predetermined width as it is. That is, at any displacement position, the thrust is larger by a substantially constant displacement than the thrust by the permanent magnet 70 and the elastic support members 80 and 80. In contrast, when a current of NI = −0.35 (N) is passed, the movement is substantially parallel downward.
[0032]
Thus, the mechanical spring constant determined by the pair of elastic support members 80, 80 is obtained from the line a in FIG. 6, and the mover 50 to which the permanent magnet 70 is attached and the coil core 31 made of iron which is a soft magnetic material are attached. A combined spring constant (line c in FIG. 6) is generated as a resultant force with a magnetic spring constant (line b in FIG. 6) composed of an attractive force that works by forming a magnetic path with the stator 10. This composite spring constant determines the resonance frequency of the vibration generator 1. The composite spring constant is given by the inclination when the horizontal axis in FIG. 6 is the displacement and the vertical axis is the stress. The composite spring constant is the same as the curve of NI = 0 (N) in FIG. 5, and NI = −0.35 (N) and NI = + 0.35 (N) when current is passed through the coil 33. Since the value of the composite spring constant given from the slope of the curve is almost the same, the resonance frequency obtained when a current is passed through the coil 33 is the resonance frequency given from the value of the composite spring constant obtained from the line c in FIG. Matches. FIG. 7 shows data obtained by measuring the vibration acceleration of the vibration generator 1 from 80 Hz to 150 Hz, and is calculated from the measured resonance frequency and the value of the combined spring constant obtained from the line c in FIG. The resonance frequency shows a good agreement.
[0033]
Next, a method for driving the vibration generator 1 will be described. As shown in FIG. 2, when no current is passed through the coil 33, the elastic support members 80 and 80 maintain the mover 50 in the neutral position. Next, when a current (for example, NI = −0.35N) is supplied to the coil 33, NS magnetic poles are excited on both end surfaces 37, 37 of the coil core 31, for example, toward the coil end surface 37 facing the right end surface 53 of the mover 50 (left (Direction). This is because the thin dotted line in FIG. 5 has a negative thrust when the displacement X = 0 mm. When the right end surface 53 of the mover 50 approaches the opposing coil end surface 37, if the direction of the current supplied to the coil 33 is reversed (NI = + 0.35N), it becomes a solid line thrust in FIG. Since this is a thrust that pulls the mover 50 in the reverse direction (right direction), the mover 50 starts to move in the reverse direction.
[0034]
Then, by reversing the current in accordance with the vibration frequency of the mover 50, the mover 50 is reversed and moved just before the both end faces 53, 53 of the mover 50 come into contact with the coil end faces 37, 37 of the stator 10. Therefore, the vibration of the mover 50 can be repeated.
[0035]
In this embodiment, since the mover 50 is supported by a pair of left and right elastic support members 80, 80, the mover 50 can be moved substantially in the left-right direction, and the coil of the stator 10 can be moved. The movement of the end faces 53, 53 of the mover 50 with respect to the end faces 37, 37 can be made substantially parallel, and the gap between the center yoke 75 and the stator 10 remains substantially constant, so that the magnetic circuit is not disturbed. Thus, stable vibration can be secured.
[0036]
FIG. 7 shows data obtained by measuring the vibration acceleration when the vibration generator 1 is vibrated at a frequency from 80 Hz to 150 Hz. The horizontal axis indicates the frequency of the current flowing through the coil 33, and the vertical axis indicates the vibration acceleration. Indicates. As shown in FIG. 7, in the vibration generator 1 having the structure used in the present invention, the vibration acceleration has a maximum value, and the frequency indicating the maximum value is called a resonance frequency. As described above, this resonance frequency is determined by the mechanical spring constant determined by the pair of elastic support members 80, 80, the mover 50 to which the permanent magnet 70 is attached, and the stator to which the coil core 31 made of iron, which is a soft magnetic material, is attached. The composite spring constant obtained as a resultant force with the magnetic spring constant composed of the attraction force that works by forming a magnetic path with 10 is in good agreement with the resonance frequency obtained by substituting the formula for obtaining the resonance frequency from the spring constant. do. From this, the vibration generator 1 of this system (structure) is subjected to vibration acceleration by the magnetic path between the pair of elastic support members 80 and 80 and the mover 50 and the stator 10 to which the permanent magnet 70 is attached. The resonance frequency having the maximum value is determined.
[0037]
In the present invention, using the frequency-vibration acceleration characteristic (see FIG. 7) of the vibration generator 1, a current whose frequency is modulated, that is, a current whose frequency is changed with time, is passed through the coil 33. By changing the vibration acceleration of the movement of the mover with time, the frequency having the optimum sensitivity for each human body is included in the changing frequency so that it is optimal for any person Sensitivity can be given, and at the same time, a fresh vibration stimulus can be continuously given by a change in vibration acceleration (vibration intensity). Hereinafter, various examples of the frequency-modulated current applied to the vibration generator 1 will be specifically described.
[0038]
First, FIG. 8 shows a circuit example (vibration generator driving means) for driving the vibration generator 1 of the present invention with a frequency-modulated current. This drive circuit is a DC 3V drive as a power source, and enables a minimum voltage DC 2.6V drive. The waveform applied to the vibration generator 1 of the present invention is an alternating square wave with a duty of 50% using an H bridge, and has a frequency modulation function for changing the vibration frequency. Needless to say, any vibration generator drive circuit may be used as long as it is a vibration generator drive circuit (vibration generator drive means) capable of performing various frequency modulations as described below.
[0039]
FIGS. 9 to 10 are diagrams showing various embodiments of the present invention, and show the state of vibration acceleration output of the vibration generator 1 when various frequency-modulated currents are inputted to the coil 33 of the vibration generator 1. FIG. In other words, in the embodiment shown in FIG. 9, a current that is frequency-modulated with a predetermined frequency amplitude (in this case, ± 10 Hz) having the resonance frequency of the vibration generator 1 as a center frequency is passed through the coil 33 to be modulated as a vibration acceleration output. The vibration acceleration change is twice the period, and the vibration acceleration value lowering portions a1 and a2 alternately obtain different vibration acceleration outputs. Thus, the vibration generator 1 of the present invention can change the vibration acceleration output at the same time as changing the vibration frequency by performing only the frequency modulation. This frequency-modulated vibration acceleration output is characterized by a maximum vibration acceleration at a sharp <instantaneous> resonance frequency and a fresh change with two slow (intermittent) low vibration acceleration values. The ability to provide vibration acceleration output. The modulation period is selected from 1 second to 3 seconds.
[0040]
The input current in the embodiment of FIG. 10 is obtained by inputting the current of a predetermined frequency amplitude (in this case ± 10 Hz) as an initial value with the resonance frequency of the vibration generator 1 of the present invention as the center frequency, and then the amplitude of this initial value. A current that repeats frequency modulation with one modulation period being gradually narrowed and converged to the resonance frequency. By passing this current through the coil 33, a vibration acceleration change that is twice the modulation period is generated, and a vibration acceleration output that gives the maximum vibration acceleration value at the end of the frequency modulation period by converging to the resonance frequency is obtained. The modulation period is selected from 1 second to 3 seconds. Also in this embodiment, by performing only frequency modulation, it is possible to change the vibration acceleration output at the same time as changing the vibration frequency.
[0041]
Input current in FIG. 11, lower by passing a current that is frequency-modulated at a predetermined modulation period at a predetermined frequency the amplitude (in this case ± 5 Hz) resonance frequency of the vibration generator 1 as the upper limit frequency to the coil 33 It alternately obtains from the vibration acceleration value at the frequency to the maximum vibration acceleration value output at the resonance frequency which is a high frequency. If this also, by performing only the frequency modulation, it is possible that changes at the same time the vibration acceleration output Given the vibration frequency changes. The modulation period is selected from 1 second to 3 seconds.
[0042]
Input current in FIG. 12, (in this case ± 5 Hz) predetermined frequency amplitude resonance frequency of the vibration generator 1 as a frequency of the lower limit by supplying a current that is frequency-modulated at a predetermined modulation period in the coil 33 From a vibration acceleration at a high frequency to a maximum vibration acceleration value output at a resonance frequency at a low frequency are alternately obtained. Accordingly, it is possible to obtain a change in the vibration acceleration output according to the characteristic curve of the frequency portion higher than the resonance frequency indicated by the frequency-vibration acceleration characteristic of FIG. Naturally, since frequency modulation is performed, vibration acceleration value output corresponding to frequency change is shown.
[0043]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. Note that any shape, structure, or material not directly described in the specification and drawings is within the scope of the technical idea of the present invention as long as the effects and advantages of the present invention are exhibited. That is, by performing various frequency modulations based on the frequency-vibration acceleration characteristics of FIG. 7, it is possible to obtain a vibration acceleration value output corresponding to a more varied frequency change. For example, a fresh vibration stimulus can be obtained by performing frequency modulation at a center frequency shifted from the resonance frequency without setting the resonance frequency as the center frequency. Further, frequency modulation may be performed so that a change in vibration acceleration value that changes from a low vibration acceleration value to a high vibration acceleration value is set as one modulation period.
[0044]
【The invention's effect】
As described in detail above, the present invention has the following excellent effects. {Circle around (1)} Since the frequency of the current flowing through the coil can be periodically changed by frequency modulation, it is possible to supply vibration of an optimal sensitivity frequency to any individual human body within the cycle. At the same time, by passing a frequency-modulated current through the coil, the vibration acceleration (vibration intensity) of the mover can be changed, and fresh vibration stimulation can be continuously applied to the human body. In other words, by simply modulating the frequency, the vibration acceleration change, which is the vibration intensity, can be obtained together with the vibration frequency change, which is the individual individual sensitivity difference, and each individual human body is continuously subjected to a fresh and sensitive vibration acceleration change. Can do.
[0045]
(2) Since the current flowing through the coil is a current that is frequency-modulated at a predetermined modulation period with the resonance frequency of the mover as the center frequency, it is possible to generate a vibration acceleration change that is twice the modulation period. The vibration acceleration value can be continuously changed.
[0046]
(3) The current flowing through the coil is a frequency-modulated current with a modulation period in which the frequency amplitude is gradually narrowed from the amplitude of a predetermined initial value and converged to the resonance frequency with the resonance frequency of the mover as the center frequency. A vibration acceleration change that is twice the modulation period can be generated, and the maximum vibration acceleration value by converging to the resonance frequency can be given at the end of the frequency modulation period, which continuously changes the frequency and vibration acceleration value. You can continue.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a vibration generator 1 according to an embodiment of the present invention.
2A is a front view of a vibration generator 1, and FIG. 2B is a side view.
3 is an exploded perspective view of the vibration generator 1. FIG.
4 is an exploded perspective view of the mover 50. FIG.
FIG. 5 is a displacement-thrust characteristic diagram of a mover when a current is passed through a coil.
FIG. 6 is a diagram for obtaining a mechanical spring constant, a magnetic spring constant, and a composite spring constant from a displacement-stress characteristic curve.
7 is a frequency-vibration acceleration characteristic diagram of the vibration generator 1. FIG.
8 is a vibration generator driving circuit diagram including a frequency modulation unit of the vibration generator 1. FIG.
FIG. 9 is a diagram showing the relationship between the input current to the vibration generator 1 and the vibration acceleration output according to the embodiment of the present invention.
FIG. 10 is a diagram showing a relationship between an input current to a vibration generator 1 and a vibration acceleration output according to another embodiment of the present invention.
FIG. 11 is a diagram showing a relationship between an input current to another vibration generator 1 and a vibration acceleration output.
FIG. 12 is a diagram showing a relationship between an input current to another vibration generator 1 and a vibration acceleration output.
FIG. 13 is a diagram showing a typical vibration mode by intermittent current of a rotary vibration motor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vibration generator 10 Stator 20 Base part with terminal 30 Coil with core 31 Coil core 33 Coil 37 End surface 40 Elastic body 50 Movable element 51 Movable element yoke 53 End surface 60 Weight 70 Permanent magnet 75 Center yoke (High permeability member)
80 Elastic support member

Claims (2)

A mover with a permanent magnet attached,
A stator having an end face opposed to the end face of the mover through a predetermined gap, and forming a magnetic path with the mover by exciting the attached coil by passing an electric current;
In a vibration generator comprising a pair of elastic support members that vibrate the mover substantially linearly by attaching one end of the wire to the mover side and the other end to the stator side,
By passing a frequency-modulated current through the coil, the vibration acceleration of the mover is changed , and
The frequency-modulated current flowing through the coil is centered on the resonance frequency of the mover determined by the elastic force generated by the pair of elastic support members and the magnetic attraction / repulsion force acting between the mover and the stator. This is a current that is frequency-modulated with a predetermined frequency amplitude as a frequency, thereby generating a vibration acceleration change that is twice the modulation period, and alternately lowering the vibration acceleration value at different vibration acceleration values. Vibration generator. A mover with a permanent magnet attached,
A stator having an end face opposed to the end face of the mover through a predetermined gap, and forming a magnetic path with the mover by exciting the attached coil by passing an electric current;
In a vibration generator comprising a pair of elastic support members that vibrate the mover substantially linearly by attaching one end of the wire to the mover side and the other end to the stator side,
By passing a frequency-modulated current through the coil, the vibration acceleration of the mover is changed, and
The frequency-modulated current flowing through the coil is centered on the resonance frequency of the mover determined by the elastic force generated by the pair of elastic support members and the magnetic attraction / repulsion force acting between the mover and the stator. The frequency is a current that is frequency-modulated with a modulation period that gradually narrows the frequency amplitude from the amplitude of a predetermined initial value and converges to the resonance frequency, thereby generating a vibration acceleration change that is twice the modulation period and the resonance frequency. The vibration generator is characterized in that the maximum vibration acceleration value by converging to is given at the end of the frequency modulation period.

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