JP2012040516A - Vibration device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration device which can prevent a derivation process of an AC current (AC voltage) supplied to a coil from being complicated.SOLUTION: The linear motor (vibration device) includes the coil, a movable part which reciprocates by a magnetic field generated by the coil, a housing that accommodates the movable part and vibrates by the reciprocation of the movable part, and a spring part provided between the movable part and the housing. Moreover, the voltage of the waveform having a shape that projects to a positive side is applied to the coil.

Description

  The present invention relates to a vibration device, and more particularly to a vibration device that includes a movable part and a coil, and a voltage is applied to the coil.

  2. Description of the Related Art Conventionally, there has been known a vibrating device that includes a movable part and a coil, and a voltage is applied to the coil (see, for example, Patent Document 1).

  In Patent Document 1, a cylindrical bobbin (movable part) around which a coil is wound, a first permanent magnet (movable part) attached to one end side of the cylindrical bobbin, and the other side of the bobbin. A second permanent magnet provided separately from the bobbin; a cylindrical frame that houses the coil, bobbin, first permanent magnet, and second permanent magnet; and a spring provided between the first permanent magnet and the frame. An acceleration generator (vibration device) is disclosed.

  In this acceleration generator, a magnetic field is generated by supplying a sinusoidal alternating current (alternating voltage) to the coil. The elastic force of the spring acts on one side of the first permanent magnet, and the magnetic field of the coil and the magnetic field of the second permanent magnet act on the other side. The magnitude of the force acting on one side and the other side of the first permanent magnet differs depending on the positions of the first permanent magnet and the bobbin, and the acceleration waveform of the first permanent magnet (bobbin) is the first permanent magnet (bobbin). ) In the moving direction in FIG. 3 is different from the other side. As a result, the user can perceive a force sense (pseudo force sense) that is pulled in a predetermined direction when holding the acceleration generator. In the acceleration generator, the induced electromotive force generated in the coil is detected, the moving speed of the bobbin and the permanent magnet is calculated from the detected induced electromotive force, and a sinusoidal alternating current is obtained so that the predetermined moving speed is obtained. After the (alternating voltage) is derived (calculated), the coil is configured to be supplied with the sinusoidal alternating current (alternating voltage).

WO2007 / 086426

  However, in the acceleration generating device disclosed in Patent Document 1, since the sinusoidal AC current (AC voltage) derived (calculated) as described above is supplied to the coil, the AC current (AC) supplied to the coil is supplied. There is a problem that the derivation process of the voltage is complicated.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to suppress the complicated process of deriving the alternating current (alternating voltage) supplied to the coil. It is to provide a vibrating device that can be used.

  In order to achieve the above object, a vibrating device according to one aspect of the present invention includes a coil, a movable part that reciprocates by a magnetic field generated by the coil, and a movable part that is housed and vibrates by the reciprocating movement of the movable part. A casing, a movable portion, and a spring portion provided between the casing, and the coil is configured to be applied with a waveform voltage having a shape protruding to one of the positive and negative polarities. Yes.

  With the above configuration, it is possible to suppress a complicated process of deriving an alternating current (alternating voltage) supplied to the coil.

1 is a plan view of a mobile phone according to a first embodiment of the present invention. It is sectional drawing of the linear motor by 1st Embodiment of this invention. It is a figure which shows the waveform of the voltage of the step shape applied to the linear motor by 1st Embodiment of this invention, and the waveform of an acceleration. It is a figure which shows the waveform of the voltage of the step shape applied to the linear motor by 1st Embodiment of this invention, and the waveform of jerk. It is a figure which shows the waveform of the voltage of the slope shape applied to the linear motor by 2nd Embodiment of this invention, and the waveform of an acceleration. It is a figure which shows the waveform of the voltage of the slope shape applied to the linear motor by 2nd Embodiment of this invention, and the waveform of jerk. It is a figure which shows the waveform of the slope shape of the effective voltage voltage applied to the linear motor by 3rd Embodiment of this invention, and the waveform of an acceleration. It is a figure which shows the waveform of the slope shape of the effective voltage voltage applied to the linear motor by 3rd Embodiment of this invention, and the waveform of jerk. It is a figure which shows the synthetic | combination waveform and acceleration waveform of the 250Hz sine wave and 50Hz sine wave which are applied to the linear motor by 4th Embodiment of this invention. It is a figure which shows the synthetic | combination waveform and jerk waveform of the 250Hz sine wave and 50Hz sine wave which are applied to the linear motor by 4th Embodiment of this invention. It is a figure which shows the waveform of the rectangular voltage applied to the linear motor by 5th Embodiment of this invention, and the waveform of an acceleration. It is a figure which shows the waveform of the rectangular voltage applied to the linear motor by 5th Embodiment of this invention, and the waveform of jerk.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
With reference to FIGS. 1-4, the structure of the mobile telephone 100 provided with the linear motor 1 by 1st Embodiment is demonstrated. The linear motor 1 is an example of the “vibration device” in the present invention.

  As shown in FIG. 1, the mobile phone 100 includes a display unit 101 made up of a liquid crystal display and a plurality of input keys 102 made up of push button switches.

  Inside the mobile phone 100, a linear motor 1 and a control circuit unit 2 for controlling an alternating current (alternating voltage) supplied to the linear motor 1 are provided. Further, the linear motor 1 is disposed at the tip end portion of the mobile phone 100 on the arrow Y1 direction side (the end portion on the opposite side to the side that holds the mobile phone 100).

  As shown in FIG. 2, the linear motor 1 includes a cylindrical housing 11, a movable portion 12 made of a cylindrical permanent magnet housed in the housing 11, and the movable portion 12 and the inner surface of the housing 11. And springs 13a and 13b provided between and a coil 14 wound around the housing 11. The permanent magnets constituting the movable portion 12 are arranged so as to have an N-pole magnetic pole surface on the arrow X1 direction side and an S-pole magnetic pole surface on the arrow X2 direction side.

  The spring portions 13a and 13b are made of a coil spring or the like. The spring parts 13a and 13b are arranged so as to be substantially symmetrical with respect to the center line of vibration (reciprocating movement) of the movable part 12. The spring portions 13a and 13b are made of the same material and have the same spring characteristics. The housing 11 also has a substantially symmetric shape with respect to the center line of the reciprocating movement of the movable portion 12. That is, the linear motor 1 as a whole has a substantially symmetrical shape with respect to the center line of the reciprocating movement of the movable portion 12.

  The coil 14 includes a coil 14a wound around the casing 11 in a clockwise direction and a coil 14b wound around the casing 11 in a counterclockwise direction when the linear motor 1 is viewed from the arrow X2 direction side. It is out. That is, the winding direction with respect to the housing 11 is opposite between the coil 14a and the coil 14b. Moreover, the coil 14a and the coil 14b are electrically connected. Further, the coil 14a is disposed on the arrow X1 direction side of the casing 11, and the coil 14b is disposed on the arrow X2 direction side of the casing 11.

  The coil 14 is connected to the control circuit unit 2 (see FIG. 1). A voltage having a waveform projecting to the positive side is applied from the control circuit unit 2 to the coil 14. Specifically, as shown in FIGS. 3 and 4, the waveform (broken line) of the voltage applied to the coil 14 has a shape that protrudes from the reference line of zero voltage to the positive side. The waveform of the voltage applied to the coil 14 is a single waveform having a rising waveform (voltage waveform at the rising time t1) and a falling waveform (voltage waveform at the falling time t2). Further, the falling time t2 of the falling waveform is configured to be longer than the rising time t1 of the rising waveform.

  Further, the rising waveform of the voltage applied to the coil 14 has a shape (steep shape) that rises abruptly as in the case of a normal pulse (rectangular) waveform, and the rising time t1 is very short. . On the other hand, the falling waveform of the voltage applied to the coil 14 has a step shape in which the voltage value at the time of falling of the voltage waveform decreases stepwise. In other words, the voltage value at the time of falling of the voltage waveform is configured such that the voltage value decreases step by step by a quarter every 1.5 ms (0.0015 seconds). Moreover, the voltage (voltage consisting of a single waveform) applied to the coil 14 is configured to be applied to the coil 14 a plurality of times at predetermined time intervals.

  Next, with reference to FIG. 1 and FIG. 2, the operation | movement of the vibration (reciprocation) of the linear motor 1 by 1st Embodiment is demonstrated.

  First, a voltage is applied to the coil 14 from the control circuit unit 2 (see FIG. 1) to supply a current to the coil 14. Thereby, a magnetic field is generated in each of the coil 14a and the coil 14b. Since the coil 14a and the coil 14b are wound in opposite directions, the direction of the magnetic field generated in the coil 14a is opposite to the direction of the magnetic field generated in the coil 14b. Thereby, the movable part 12 receives an attractive force along the X direction from one of the coil 14a and the coil 14b and a repulsive force from the other. As a result, the movable part 12 moves along the X direction. Further, by reversing the voltage applied to the coil 14 and supplying a current in the reverse direction, the movement of the movable portion 12 is reversed. Thus, the movable part 12 vibrates by reversing the voltage and applying the voltage to the coil 14. Further, the casing 11 (the mobile phone 100) also vibrates with the vibration of the movable part 12.

  Then, for example, the mobile phone 100 provided with the linear motor 1 is gripped by applying a waveform voltage that protrudes positively to the coil 14 as shown in FIG. 3 and FIG. In this case, a pseudo force sensation (traction feeling) that can be pulled in a predetermined direction is obtained by the vibration of the movable portion 12. Furthermore, by inverting the voltage applied to the coil 14, it is possible to easily change the direction of the pseudo force sense obtained when the mobile phone 100 is gripped in the opposite direction.

  Next, with reference to FIG. 3 and FIG. 4, the linear motor 1 when a voltage (V) having a step shape in which the voltage value at the time of falling of the voltage waveform decreases stepwise is applied to the coil 14 of the linear motor 1. The results of experiments performed on the acceleration and the calculation results of jerk obtained by differentiating the acceleration with time will be described. In FIG. 3, the vertical axis represents voltage (V) and acceleration (G), and the horizontal axis represents time (seconds). In FIG. 4, the vertical axis represents voltage (V) and jerk (G / s), and the horizontal axis represents time (seconds).

  As shown in FIG. 3, when a step-shaped voltage (V) (broken line) in which the voltage value at the time of falling of the voltage waveform decreases stepwise is applied to the coil 14 of the linear motor 1, the acceleration is zero. A waveform of acceleration (solid line) having an asymmetric shape with respect to the reference line was obtained. The frequency of the voltage (V) is 50 Hz.

  It was also confirmed that the acceleration suddenly increased to the positive side when the voltage waveform rises (rise time t1). Then, it was confirmed that the acceleration becomes the largest at the time when the voltage value of the voltage waveform is constant (time t3 between the rising time t1 and the falling time t2). Thereafter, it was confirmed that the acceleration gradually decreased as the voltage value of the voltage waveform decreased stepwise at the time of falling of the voltage waveform (fall time t2). The absolute value of the maximum value on the positive side of the acceleration is 1.3 (G), and the absolute value of the maximum value on the negative side of the acceleration is 0.5 (G). It was confirmed that there was an acceleration difference of 0.8 (G).

  Next, by differentiating the acceleration shown in FIG. 3 with respect to time, as shown in FIG. 4, a waveform of a jerk (solid line) having an asymmetric shape with respect to a reference line of zero jerk was obtained. In addition, it was confirmed that the jerk increases rapidly to the positive side substantially simultaneously with the rise of the voltage waveform at the rise of the voltage waveform (rise time t1). Then, it was confirmed that the jerk rapidly decreases during the time when the voltage value of the voltage waveform becomes constant (time t3 between the rising time t1 and the falling time t2). Thereafter, it was confirmed that the jerk repeats 0 or a negative state at the time of falling of the voltage value of the voltage waveform (falling time t2). Further, the absolute value of the maximum value on the positive side of the jerk is 2000 (G / s), and the absolute value of the maximum value on the negative side of the jerk is 700 G (G / s). It was confirmed that there was a jerk difference of 1300 (G / s) from the negative side. When the mobile phone 100 provided with the linear motor 1 having the waveform of the jerk (acceleration shown in FIG. 3) shown in FIG. It was confirmed.

  In the linear motor 1 according to the first embodiment, the following effects can be obtained.

  (1) The coil 14, the movable part 12 that reciprocates due to the magnetic field generated by the coil 14, the casing 11 that houses the movable part 12 and vibrates due to the reciprocating movement of the movable part 12, and the movable part 12 and the casing 11 are provided with spring portions 13a and 13b. The coil 14 is configured to be applied with a waveform voltage having a step shape protruding to the positive side. Thereby, for example, after detecting the induced electromotive force generated in the coil and calculating the moving speed of the movable part, and after deriving (calculating) a sinusoidal alternating current (alternating voltage) so as to obtain a predetermined moving speed. Unlike the case where a sinusoidal alternating current (alternating voltage) is supplied to the coil, a desired pseudo force sense can be easily applied to the linear motor 1 simply by applying a waveform voltage having a step shape protruding to the positive side to the coil. (Traction feeling) can be generated. As a result, it is possible to suppress the complexity of the derivation process of the alternating current (alternating voltage) supplied to the coil.

  (2) A voltage having a single waveform is applied to the coil 14 a plurality of times at a predetermined time interval. Thus, unlike the case where a single waveform voltage is applied to the coil 14 only once, the linear motor 1 can generate a pseudo force sense (traction feeling) in a desired direction a plurality of times. Since the motor 1 generates a pseudo force sensation (traction sensation) a plurality of times, a pseudo force sensation (traction sensation) can be reliably obtained.

  (3) The voltage waveform applied to the coil 14 is configured to have a shape projecting to the positive side from the zero reference line of the voltage applied to the coil 14. Thereby, for example, the maximum value on the positive side of the voltage waveform can be increased as compared with a case where the voltage applied to the coil 14 has a shape protruding to the positive side from a position shifted to the negative side from the zero reference line. Since it can be increased, the maximum value on the positive side of acceleration can be increased accordingly.

  (4) The fall time of the voltage waveform applied to the coil 14 is configured to be longer than the rise time of the voltage waveform. As a result, the acceleration at the time of falling of the voltage waveform can be gradually reduced, and the acceleration at the time of rising of the voltage waveform can be rapidly increased. As a result, a difference in jerk between a positive maximum value and a negative maximum value of the jerk obtained by differentiating the acceleration with respect to time is generated, so that the pseudo force sense (traction feeling) can be further improved.

  (5) The voltage value at the time of falling of the voltage waveform is configured to have a step shape that decreases stepwise. As a result, the acceleration that occurs when the voltage waveform falls is gradually reduced, so that the acceleration can be gradually reduced.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS. 5 and 6. In the second embodiment, unlike the first embodiment in which a voltage (V) having a step shape in which the voltage value at the time of falling of the voltage waveform is reduced stepwise is applied to the coil 14 of the linear motor 1, the voltage waveform A case where a slope-shaped voltage (V) at which the voltage value at the time of the falling of the voltage continuously decreases is applied to the coil 14 of the linear motor 1 will be described.

  The voltage waveform applied to the coil 14 of the linear motor 1 according to the second embodiment has a slope shape in which the voltage value at the time of falling decreases continuously (linearly). Further, the falling time t12 of the falling waveform is configured to be longer than the rising time t11 of the rising waveform.

  Next, an experiment conducted on the acceleration of the linear motor 1 when a slope-shaped voltage (V) in which the voltage value at the time of falling of the voltage waveform continuously (linearly) decreases is applied to the coil 14 of the linear motor 1. A result and a calculation result of jerk obtained by differentiating acceleration with time will be described. In FIG. 5, the vertical axis indicates voltage (V) and acceleration (G), and the horizontal axis indicates time (seconds). In FIG. 6, the vertical axis indicates voltage (V) and jerk (G / s), and the horizontal axis indicates time (seconds).

  As shown in FIG. 5, when a slope-shaped voltage (V) (broken line) in which the voltage value at the time of falling of the voltage waveform continuously decreases is applied to the coil 14 of the linear motor 1, the acceleration becomes zero. A waveform of acceleration (solid line) having an asymmetric shape with respect to the reference line was obtained.

  It was also confirmed that the acceleration suddenly increased to the positive side when the voltage waveform rises (rise time t11). Then, it was confirmed that the acceleration becomes the largest at the time when the voltage value of the voltage waveform is constant (time t13 between the rising time t11 and the falling time t12). Thereafter, it was confirmed that the acceleration gradually decreased as the voltage value of the voltage waveform decreased stepwise at the time of falling of the voltage waveform (fall time t12). The absolute value of the maximum value on the positive side of the acceleration is 1.3 (G), and the absolute value of the maximum value on the negative side of the acceleration is 0.6 (G). Then, it was confirmed that there was an acceleration difference of 0.7 (G).

  Next, by differentiating the acceleration shown in FIG. 5 with respect to time, as shown in FIG. 6, a waveform of a jerk (solid line) having an asymmetric shape with respect to a reference line of zero jerk was obtained. Further, it was confirmed that the jerk suddenly increased to the positive side substantially simultaneously with the rise of the voltage waveform at the rise of the voltage waveform (rise time t11). Then, it was confirmed that the jerk suddenly decreases to the negative side at the time when the voltage value of the voltage waveform becomes constant (time t13 between the rising time t11 and the falling time t12). Thereafter, it was confirmed that the jerk is in a negative state when the voltage value of the voltage waveform falls (fall time t12). Further, the absolute value of the maximum value on the positive side of the jerk is 1900 (G / s), and the absolute value of the maximum value on the negative side of the jerk is 500 G (G / s). It was confirmed that there was a jerk difference of 1400 (G / s) from the negative side. When the mobile phone 100 provided with the linear motor 1 having the waveform of jerk (acceleration shown in FIG. 5) shown in FIG. 6 is gripped, a pseudo force sense (traction feeling) can be obtained on the positive side of jerk. It was confirmed.

  Other configurations are the same as those in the first embodiment.

  Moreover, in the linear motor 1 by 2nd Embodiment, the following effects can be acquired.

  (6) The voltage value at the fall of the voltage waveform is configured to have a slope shape that continuously decreases. As a result, the acceleration is continuously reduced as compared with the case where the acceleration generated when the voltage waveform falls is reduced stepwise, so that the acceleration can be reduced more smoothly.

(Third embodiment)
Next, a third embodiment will be described with reference to FIGS. In the third embodiment, unlike the second embodiment in which a slope-shaped voltage (V) in which the voltage value at the falling edge of the voltage waveform continuously decreases is applied to the coil 14 of the linear motor 1, the effective voltage A case where a slope-shaped voltage (V) in which the voltage value at the time of falling of a typical voltage waveform continuously decreases is applied to the coil 14 of the linear motor 1 will be described.

  The voltage waveform applied to the coil 14 of the linear motor 1 according to the third embodiment has a slope shape in which the voltage value when the effective voltage waveform falls is continuously reduced. Specifically, the voltage waveform applied to the coil 14 is such that the voltage value at the time of falling is effective by pulse width modulation (PWM: Pulse Width Modulation) of the voltage waveform at the time of falling (falling waveform). As a value, it has a slope shape that is continuously (linearly) smaller. Further, the falling time t22 of the falling waveform is configured to be longer than the rising time t21 of the rising waveform.

  Next, an experiment conducted on the acceleration of the linear motor 1 when a slope-shaped voltage (V) in which the voltage value at the time of falling of the effective voltage waveform continuously decreases is applied to the coil 14 of the linear motor 1. A result and a calculation result of jerk obtained by differentiating acceleration with time will be described. In FIG. 7, the vertical axis indicates voltage (V) and acceleration (G), and the horizontal axis indicates time (seconds). In FIG. 8, the vertical axis represents voltage (V) and jerk (G / s), and the horizontal axis represents time (seconds).

  As shown in FIG. 7, when a slope-shaped voltage (V) (broken line) in which the voltage value at the falling edge of the effective voltage waveform continuously decreases is applied to the coil 14 of the linear motor 1 A waveform of acceleration (solid line) having an asymmetric shape with respect to a reference line of zero acceleration was obtained.

  It was also confirmed that the acceleration suddenly increased to the positive side when the voltage waveform rises (rise time t21). Then, it was confirmed that the acceleration becomes the largest at the time when the voltage value of the voltage waveform is constant (time t23 between the rising time t21 and the falling time t22). Thereafter, it was confirmed that the acceleration gradually decreased as the voltage value of the voltage waveform continuously decreased at the time of falling of the voltage waveform (fall time t22). The absolute value of the maximum value on the positive side of the acceleration is 1.3 (G), and the absolute value of the maximum value on the negative side of the acceleration is 0.7 (G). It was confirmed that there was an acceleration difference of 0.6 (G).

  Next, by differentiating the acceleration shown in FIG. 7 with respect to time, as shown in FIG. 8, a waveform of a jerk (solid line) having an asymmetric shape with respect to a reference line of zero jerk was obtained. Further, it was confirmed that the jerk suddenly increased to the positive side substantially simultaneously with the rise of the voltage waveform at the rise of the voltage waveform (rise time t21). Then, it was confirmed that the jerk is rapidly reduced to the negative side at the time when the voltage value of the voltage waveform becomes constant (time t23 between the rising time t21 and the falling time t22). Thereafter, it was confirmed that the jerk is in a negative state when the voltage value of the voltage waveform falls (fall time t22). Further, the absolute value of the maximum value on the positive side of the jerk is 1900 (G / s), and the absolute value of the maximum value on the negative side of the jerk is 500 G (G / s). It was confirmed that there was a jerk difference of 1400 (G / s) from the negative side. When the mobile phone 100 provided with the linear motor 1 having the waveform of jerk (acceleration shown in FIG. 7) shown in FIG. 8 is gripped, a pseudo force sense (traction feeling) can be obtained on the positive side of jerk. It was confirmed.

  The remaining configuration and effects of the third embodiment are similar to those of the aforementioned second embodiment.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIGS. 9 and 10. In the fourth embodiment, unlike the second embodiment in which a slope-shaped voltage (V) in which the voltage value at the falling edge of the voltage waveform continuously decreases is applied to the coil 14 of the linear motor 1, the frequency is When a sine wave having a frequency of 50 Hz and a sine wave having a frequency of 50 Hz are combined, and a slope-shaped voltage (V) at which the voltage value at the time of falling of the voltage waveform continuously decreases is applied to the coil 14 of the linear motor 1 Will be described.

  The voltage waveform applied to the coil 14 of the linear motor 1 according to the fourth embodiment has a continuous voltage value at the falling edge of a voltage waveform obtained by synthesizing a sine wave having a frequency of 250 Hz and a sine wave having a frequency of 50 Hz. It has a smaller slope shape. This voltage waveform (composite waveform) is configured such that a positive voltage waveform of a 250 Hz sine wave is input at the time of rise and a positive voltage waveform of a 50 Hz sine wave is input to the coil 14 at the time of fall. Has been. That is, the negative side voltage waveforms of the 250 Hz sine wave and the 50 Hz sine wave are not input to the coil 14. Thereby, a voltage having a relatively steep waveform is input at the time of rising, and a voltage having a relatively gentle waveform is applied to the coil 14 at the time of falling. Thus, the time t32 required when the voltage waveform falls is configured to be longer than the time t31 required when the voltage waveform rises.

  Next, experimental results of the acceleration of the linear motor 1 when a voltage (V) obtained by synthesizing a sine wave of 250 Hz and a sine wave of 50 Hz is applied to the coil 14 of the linear motor 1, and the acceleration is differentiated by time. The calculation result of the jerk obtained by doing so will be described. In FIG. 9, the vertical axis indicates voltage (V) and acceleration (G), and the horizontal axis indicates time (seconds). In FIG. 10, the vertical axis indicates voltage (V) and jerk (G / s), and the horizontal axis indicates time (seconds).

  As shown in FIG. 9, when a voltage (V) (broken line) obtained by combining a sine wave of 250 Hz and a sine wave of 50 Hz is applied to the coil 14 of the linear motor 1, the acceleration is zero with respect to the reference line. Thus, an asymmetrical acceleration (solid line) waveform was obtained.

  It was also confirmed that the acceleration suddenly increased to the positive side when the voltage waveform rises (rise time t31). Then, it was confirmed that the acceleration becomes the largest at the time when the voltage value of the voltage waveform becomes the largest (the time between the rising time t31 and the falling time t32). Thereafter, it was confirmed that the acceleration gradually decreased as the voltage value of the voltage waveform gradually decreased at the time of falling of the voltage waveform (fall time t32). The absolute value of the maximum value on the positive side of the acceleration is 0.8 (G), and the absolute value of the maximum value on the negative side of the acceleration is 0.4 (G). It was confirmed that there was an acceleration difference of 0.4 (G).

  Next, by differentiating the acceleration shown in FIG. 9 with respect to time, as shown in FIG. 10, a waveform of a jerk (solid line) having an asymmetric shape with respect to a reference line of zero jerk was obtained. In addition, it was confirmed that the jerk increases rapidly to the positive side substantially simultaneously with the rise of the voltage waveform at the rise of the voltage waveform (rise time t31). Then, it was confirmed that the jerk suddenly decreases to the negative side in the vicinity of the time point when the voltage value of the voltage waveform becomes the largest (the time point between the rising time t31 and the falling time t32). Thereafter, it was confirmed that the jerk is in a negative state when the voltage value of the voltage waveform falls (fall time t32). In addition, the absolute value of the maximum value on the positive side of the jerk is 900 (G / s), and the absolute value of the maximum value on the negative side of the jerk is 400 G (G / s). It was confirmed that there was a jerk difference of 500 (G / s) from the negative side. When the mobile phone 100 provided with the linear motor 1 having the waveform of the jerk shown in FIG. 10 (acceleration shown in FIG. 9) is gripped, a pseudo force sense (traction feeling) can be obtained on the positive side of the jerk. It was confirmed.

  The remaining configuration and effects of the fourth embodiment are similar to those of the aforementioned second embodiment.

(Fifth embodiment)
Next, a fifth embodiment will be described with reference to FIGS. 11 and 12. In the fifth embodiment, unlike the first embodiment in which a step-shaped voltage (V) in which the voltage value at the time of falling of the voltage waveform decreases stepwise is applied to the coil 14 of the linear motor 1, the rectangular shape A case where a (pulsed) voltage (V) is applied to the coil 14 of the linear motor 1 will be described.

  Next, the result of an experiment performed on the acceleration of the linear motor 1 when a voltage (V) having a rectangular voltage waveform was applied to the coil 14 of the linear motor 1, and the acceleration was obtained by differentiating the acceleration with time. The calculation result of jerk will be described. In FIG. 11, the vertical axis indicates voltage (V) and acceleration (G), and the horizontal axis indicates time (seconds). In FIG. 12, the vertical axis indicates voltage (V) and jerk (G / s), and the horizontal axis indicates time (seconds).

  As shown in FIG. 11, when a rectangular voltage (V) (broken line) is applied to the coil 14 of the linear motor 1, the acceleration (solid line) having an asymmetric shape with respect to the acceleration zero reference line. Waveform was obtained.

  It was also confirmed that the acceleration suddenly increased to the positive side when the voltage waveform rises (rise time t41). Then, it was confirmed that the acceleration becomes the largest at the time when the voltage value of the voltage waveform is constant (time t43 between the rising time t41 and the falling time t42). Thereafter, it was confirmed that the acceleration suddenly decreased to the negative side as the voltage value of the voltage waveform decreased at the time of falling of the voltage waveform (fall time t42). The absolute value of the maximum value on the positive side of acceleration is 1.1 (G), and the absolute value of the maximum value on the negative side of acceleration is 0.4 (G). Then, it was confirmed that there was an acceleration difference of 0.7 (G).

  Next, by differentiating the acceleration shown in FIG. 11 with respect to time, as shown in FIG. 12, a waveform of a jerk (solid line) having an asymmetric shape with respect to a reference line of zero jerk was obtained. In addition, it was confirmed that the jerk increases rapidly to the positive side substantially simultaneously with the rise of the voltage waveform at the rise of the voltage waveform (rise time t41). Then, it was confirmed that the jerk is rapidly reduced to the negative side at the time when the voltage value of the voltage waveform becomes constant (time t43 between the rising time t41 and the falling time t42). After that, it was confirmed that the jerk is rapidly decreased further to the negative side when the voltage value of the voltage waveform falls (fall time t42). Further, the absolute value of the maximum value on the positive side of jerk is 2000 (G / s), and the absolute value of the maximum value on the negative side of jerk is 2000 (G / s). It was confirmed that the difference between the maximum value on the positive side and the maximum value on the negative side was zero.

  When the mobile phone 100 provided with the linear motor 1 having the waveform of jerk (acceleration shown in FIG. 11) shown in FIG. 12 is grasped, a pseudo force sense (traction feeling) can be obtained on the positive side of the acceleration. Was confirmed. However, it has been found that the pseudo sensation (traction sensation) obtained in the fifth embodiment is smaller than the pseudo sensation (traction sensation) obtained in the first to fourth embodiments. In the case of the fifth embodiment, the difference between the maximum value on the positive side and the maximum value on the negative side of the jerk is 0. However, since the acceleration difference is 0.7 G, a pseudo value is set on the positive side where the acceleration is large. It is thought that force sense (traction feeling) occurred. From this, the present inventor has found that even if there is no difference in jerk, if there is a difference in acceleration, it is possible to obtain a certain amount of pseudo force sensation (traction feeling). Furthermore, it has been found that jerk greatly affects the pseudo sensation from the difference in pseudo sensation (traction sensation) between the first to fourth embodiments described above and the fifth embodiment.

  The remaining configuration and effects of the fifth embodiment are similar to those of the aforementioned first embodiment.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the first to fifth embodiments, an example in which a waveform voltage having a shape projecting to the positive side is applied to the coil has been described, but the present invention is not limited to this. In the present invention, a waveform voltage having a shape protruding to the negative side may be applied to the coil.

  In the first to fifth embodiments, the voltage waveform applied to the coil has an example in which the voltage waveform applied to the coil protrudes from the zero reference line to the positive side. Not limited to. For example, the voltage waveform applied to the coil may have a shape protruding to the positive side from a position shifted from the reference line of 0 of the voltage applied to the coil to the positive side or the negative side.

  Moreover, in the said 1st-5th embodiment, the voltage value at the time of the fall of a voltage waveform becomes small in steps as an example of the voltage of the waveform which has the shape which protrudes to the positive or negative one polarity side of this invention. A step shape, a voltage waveform or a slope shape in which the voltage value at the time of falling of the effective voltage waveform continuously decreases, a shape in which two sine waves are combined, and a rectangular voltage are shown. Is not limited to this. For example, as long as the shape protrudes toward one of the positive and negative polarities, the voltage waveform may have a step shape, a slope shape, a shape obtained by combining two sine waves, and a shape other than a rectangular shape.

1 Linear motor (vibration device)
2 Control circuit part 11 Case 12 Movable part 13a, 13b Spring part 14 Coil 100 Mobile phone

Claims (5)

Coils,
A movable part that reciprocates by a magnetic field generated by the coil;
A housing that houses the movable portion and vibrates by reciprocating movement of the movable portion;
A spring portion provided between the movable portion and the housing;
An oscillating device configured to be applied with a waveform voltage having a shape protruding to one positive or negative polarity side to the coil. The voltage waveform applied to the coil consists of a single waveform having a rising waveform and a falling waveform,
The vibrating device according to claim 1, wherein the single waveform voltage is configured to be applied to the coil a plurality of times at predetermined time intervals.   3. The voltage waveform applied to the coil is configured to have a shape that protrudes toward a positive or negative one polarity side from a zero reference line of the voltage applied to the coil. Vibration device.   The vibrating device according to claim 1, wherein a fall time of the voltage waveform applied to the coil is configured to be longer than a rise time of the voltage waveform.   The voltage waveform applied to the coil has a step shape in which the voltage value at the time of falling of the voltage waveform decreases stepwise, or the voltage value at the time of falling of the voltage waveform or effective voltage waveform is continuous. The vibrating device according to claim 4, wherein the vibrating device is configured to have a decreasing slope shape.

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