JP5654387B2 - Linear vibration motor drive control device, linear vibration motor drive control method, and small electric device - Google Patents

Description

  The present invention relates to a drive control device for a linear vibration motor, a drive control method for a linear vibration motor, and a small electric device.

2. Description of the Related Art Conventionally, as a small electric device, an electric razor that cuts a whisker by sandwiching the whisker between an inner blade and an outer blade is known.
In the electric shaver described in Patent Document 1, a linear vibration motor is employed as a drive source. This linear vibration motor generates vibration using the power of the battery. When it is detected that the battery voltage has dropped to the threshold voltage, the vibration amplitude of the motor is gradually reduced through execution of stop control that is power supply control for stopping the linear vibration motor. Thereby, the sudden stop of the linear vibration motor when the battery voltage decreases is avoided.

  In addition, the electric razor described in Patent Document 2 has, as its control mode, a normal control mode for cutting the beard and a control mode for cleaning when cleaning the blade portion. Switching between the normal control mode and the cleaning control mode is performed according to the ON time of the main switch operated when operating the electric razor. In the control mode for cleaning, the vibration amplitude of the blade is set smaller than in the normal control mode. For this reason, scattering of water or whiskers during cleaning of the blade is suppressed.

JP-A-9-65634 JP 2004-16285 A

  The applicant of the present application is studying an electric razor having both the stop control function of Patent Document 1 and the control mode switching function of Patent Document 2. As described above, when a transition is made from the normal control mode to another control mode, the operating sound changes due to the change of the vibration amplitude of the linear vibration motor. In many cases, the control mode change can be recognized. The same applies to the transition from the normal control mode to the stop control.

  Here, there is a concern that the change in the operation sound due to the switching of the control mode and the change in the operation sound due to the start of the execution of the stop control approximate each other. In this case, the user confuses the change in the operation sound due to the switching of the control mode with the change in the operation sound due to the start of execution of the stop control, so that the control state of the electric razor through the change in the operation sound is changed. Identification may be difficult. For example, even though the execution of the stop control is actually started, the change in the operation sound at that time approximates the change in the operation sound at the time of switching the control mode. It is assumed that it will be misrecognized. In this case, the user feels uncomfortable and may affect the usability of the electric razor.

Note that this problem is not limited to the electric shaver, but may also occur in other small electric devices in which a linear vibration motor such as an electric toothbrush or an electric clipper is mounted.
The present invention has been made to solve the above problems, and its purpose is to suppress confusion between an operation caused by a decrease in power supply voltage and an operation caused by switching to a specific control mode. A linear vibration motor drive control apparatus, a linear vibration motor drive control method, and a small electric device.

  A drive control device for a linear vibration motor according to an aspect of the present invention is a control device that generates vibration using the power of a battery, the battery state detection unit detecting a remaining capacity state of the battery, and the linear vibration A control unit that controls at least one of the amplitude and the frequency of the vibration through power supply control to the motor, and the control unit includes a normal control mode as a control mode of the linear vibration motor, and another control mode. And when the fact that the remaining capacity of the battery is reduced is detected through the battery state detection unit during the power supply control in the normal control mode, the power supply control is intended to stop the linear vibration motor. When stop control is executed and the transition from the normal control mode to another control mode is performed, the amplitude and frequency of the vibration are changed before and after the transition. At least one of them performs power supply control so that it differs from that in the normal control mode, and the power supply control is a change in operating sound due to the execution of the stop control accompanying a decrease in the remaining capacity of the battery, or Whether the operating sound changes due to the transition from the normal control mode to the other control mode is identified by the difference in the degree of change related to the operating sound of the linear vibration motor before and after the start of the stop control. Thus, the degree of temporal change in at least one of the amplitude and frequency of the vibration before and after the start of the stop control is made smaller than the degree before and after the transition from the normal control mode to the other control mode.
  A drive control device for a linear vibration motor according to another aspect of the present invention is a control device that generates vibration using the power of a battery, and includes a battery state detection unit that detects a remaining capacity state of the battery, A control unit that controls at least one of the amplitude and frequency of the vibration through power supply control for the linear vibration motor, and the control unit includes a normal control mode as a control mode of the linear vibration motor, and other control modes. A power supply control for stopping the linear vibration motor when it is detected through the battery state detection unit that the remaining capacity of the battery has decreased during execution of the power supply control in the normal control mode. When the stop control is executed and the transition from the normal control mode to another control mode is performed, the vibration amplitude and frequency before and after the transition are changed. When power supply control is executed so that at least one of them is different from that in the normal control mode and execution of the stop control is started, a temporal change in at least one of the amplitude and frequency of the vibration before and after the start The power supply control is executed so that the degree of power is smaller than the degree before and after the transition from the normal control mode to the other control mode. When it is detected that the power source is connected, the feeding control for the linear vibration motor is stopped for a certain period, and then the feeding control in the normal control mode is started.
  A small electric apparatus according to an aspect of the present invention includes the drive control device for the linear vibration motor.
  A drive control method for a linear vibration motor according to an aspect of the present invention is a control method for generating vibration using battery power, and includes a normal control mode and other controls as the control mode of the linear vibration motor. Mode, and when it is detected that the remaining capacity of the battery has decreased during execution of power supply control in the normal control mode, stop control which is power supply control for stopping the linear vibration motor is executed. When the transition from the normal control mode to another control mode, before and after the transition, power supply control is executed so that at least one of the amplitude and frequency of the vibration is different from that in the normal control mode, In the power supply control, whether the operation sound is changed due to the execution of the stop control accompanying a decrease in the remaining capacity of the battery, or the other control from the normal control mode. Before and after the start of the stop control, the change in the operation sound accompanying the transition to the mode is identified by the difference in the degree of change in the operation sound of the linear vibration motor before and after the start of the stop control. The degree of temporal change of at least one of the amplitude and frequency of the vibration is made smaller than the degree before and after the transition from the normal control mode to the other control mode.

  According to the present invention, it is possible to suppress confusion between an operation caused by a decrease in power supply voltage and an operation caused by switching to a specific control mode.

The perspective view of the electric shaver in 1st Embodiment. The block diagram which shows schematic structure of a linear vibration motor similarly. (A) is a waveform diagram showing temporal changes in vibration amplitude when transitioning from normal control mode to stop control, and (b) and (c) are waveforms showing temporal changes in pulse width of pulse signals, respectively. FIG. 4A is a waveform diagram showing a change over time of the drive current supplied to the linear vibration motor, FIG. 5E is a waveform diagram showing a change over time in the battery voltage, and FIG. The wave form diagram which shows the time change of the detection signal. (A) is a waveform diagram showing a temporal change in vibration amplitude when transitioning from a normal control mode to another control mode, and (b) and (c) show temporal changes in the pulse width of the pulse signal, respectively. The waveform figure which shows the time change of the drive current supplied to a linear vibration motor similarly (d). (A) is a waveform diagram showing a temporal change in vibration amplitude when transitioning from the normal control mode to stop control, and (b) is a temporal diagram of vibration amplitude when transitioning from the normal control mode to another control mode. The wave form diagram which shows a change. The graph which shows the time change of the vibration amplitude in each when transitioning from a normal control mode to stop control, and when transitioning from a normal control mode to another control mode. The block diagram which shows schematic structure of the linear vibration motor in 2nd Embodiment. The graph which shows the time change of the vibration amplitude in each when not performing feedback control similarly when performing feedback control similarly. The block diagram which shows schematic structure of the linear vibration motor in 3rd Embodiment. (A) is a waveform diagram (no output stop function) showing a temporal change in vibration amplitude when an external power supply is connected when stop control is executed in a state where the external power supply is not connected; ), (C) are waveform diagrams showing temporal changes in the pulse width of the pulse signal, respectively, (d) is a waveform diagram showing temporal changes in the drive current supplied to the linear vibration motor, and (e) is a battery. The wave form diagram which shows the time change of a voltage, Similarly (f) is a wave form diagram which shows the time change of the detection signal of a battery state detection part. (A) is a waveform diagram (with an output stop function) showing a temporal change in vibration amplitude when an external power supply is connected when stop control is executed in a state where the external power supply is not connected; ), (C) are waveform diagrams showing temporal changes in the pulse width of the pulse signal, respectively, (d) is a waveform diagram showing temporal changes in the drive current supplied to the linear vibration motor, and (e) is a battery. The wave form diagram which shows the time change of a voltage, Similarly (f) is a wave form diagram which shows the time change of the detection signal of a battery state detection part. The block diagram which shows schematic structure of the linear vibration motor in 4th Embodiment. The timing chart which similarly shows the relationship between the operation state of a linear vibration motor, and the display timing to the effect that execution of stop control was started. The timing chart which similarly shows the relationship between the operation state of a linear vibration motor, and the display timing to the effect that the remaining capacity of the battery has decreased. The block diagram which shows schematic structure of the linear vibration motor in 5th Embodiment.

  (An example of a form that can be taken by a drive control device for a linear vibration motor)
  [1] A drive control device for a linear vibration motor according to an aspect of the present invention is a control device that generates vibration using the power of a battery, and includes a battery state detection unit that detects a remaining capacity state of the battery, A control unit that controls at least one of the amplitude and frequency of the vibration through power supply control for the linear vibration motor, and the control unit is configured to control a normal control mode as the control mode of the linear vibration motor, and the other Power supply for stopping the linear vibration motor when it is detected through the battery state detection unit that the remaining capacity of the battery is reduced during power supply control in the normal control mode. When stop control, which is control, is performed and a transition is made from the normal control mode to another control mode, the vibration amplitude and the frequency before and after the transition are changed. Power supply control is performed such that at least one of the numbers is different from that in the normal control mode, and the power supply control is a change in operation sound due to the execution of the stop control accompanying a decrease in the remaining capacity of the battery, or The change in the operating sound associated with the transition from the normal control mode to the other control mode is identified by the difference in the degree of change in the operating sound of the linear vibration motor before and after the start of the stop control. As described above, the degree of temporal change of at least one of the amplitude and frequency of the vibration before and after the start of the stop control is made smaller than the degree before and after the transition from the normal control mode to the other control mode. .
  [2] A drive control device for a linear vibration motor according to another aspect of the present invention is a control device that generates vibration using the power of a battery, and detects a remaining capacity state of the battery. And a control unit that controls at least one of the amplitude and the frequency of the vibration through power supply control to the linear vibration motor, and the control unit has a normal control mode as a control mode of the linear vibration motor, and When it is detected that the remaining capacity of the battery has decreased through the battery state detection unit during execution of power supply control in the normal control mode, the linear vibration motor is stopped. When the transition control from the normal control mode to another control mode is executed, the vibration amplitude before and after the transition, When power supply control is executed so that at least one of the frequencies is different from that in the normal control mode and the execution of the stop control is started, the amplitude of the vibration before and after the start and the time of at least one of the frequencies The power supply control is executed so that the degree of change is smaller than the degree before and after the transition from the normal control mode to the other control mode, and the control unit starts executing the stop control. When it is detected that the external power source is connected, the power feeding control for the linear vibration motor is stopped for a certain period, and then the power feeding control in the normal control mode is started.
  [3] According to an example of the drive control device for the linear vibration motor, the control unit controls at least one of the amplitude and the frequency of the vibration through the control of a pulse current as the power feeding control.
  [4] According to an example of the drive control device for the linear vibration motor, the linear vibration motor includes a feedback control detection unit that detects at least one of an amplitude and a frequency of the vibration, and the control unit includes the feedback control detection unit. In accordance with the detection result, power feeding to the linear vibration motor is feedback-controlled.
  [5] According to an example of the drive control device for the linear vibration motor, the control unit performs at least one of a state of the remaining battery capacity and a control mode according to a detection result of the battery state detection unit. While displaying on an external display device, when starting execution of the stop control, it is displayed on the display device as well.
  [6] According to an example of the drive control device for the linear vibration motor, the control unit displays on the display device that the linear vibration motor has stopped due to a decrease in the remaining capacity of the battery after the stop. .
  [7] According to an example of the drive control device for the linear vibration motor, the battery is a secondary battery.
  [8] A small electric apparatus according to an aspect of the present invention includes the linear vibration motor drive control device according to any one of [1] to [7].
  [9] A drive control method for a linear vibration motor according to an aspect of the present invention is a control method for generating vibration using battery power, and a normal control mode as a control mode of the linear vibration motor, and Stop control that has another control mode and is power supply control for stopping the linear vibration motor when it is detected that the remaining capacity of the battery has decreased during execution of power supply control in the normal control mode When the transition from the normal control mode to another control mode is performed, power feeding control is performed so that at least one of the amplitude and frequency of the vibration is different from that in the normal control mode before and after the transition. In the power supply control, it is a change in the operation sound due to the execution of the stop control accompanying a decrease in the remaining capacity of the battery, or from the normal control mode, the The start of the stop control is such that whether the change in the operation sound accompanying the transition to the control mode is identified by the difference in the degree of change related to the operation sound of the linear vibration motor before and after the start of the stop control. The degree of temporal change of at least one of the amplitude and frequency of the vibration before and after is made smaller than the degree before and after the transition from the normal control mode to the other control mode.

<First Embodiment>
Hereinafter, an embodiment in which the present invention is embodied in an electric shaver will be described with reference to FIGS.
<Overall configuration of electric razor>
As shown in FIG. 1, an inner blade 14 is provided on the upper portion of the housing 12 of the electric razor 11 via a linear vibration motor 13, and an outer blade 15 is detachably provided so as to cover the inner blade 14. It has been. In a state where the outer blade 15 is attached to the housing 12, the outer surface of the inner blade 14 can be slidably contacted with the inner surface of the outer blade 15. When the switch 16 provided on the outer surface of the housing 12 is operated, operating power is supplied to the linear vibration motor 13. In response to the supply of the electric power, the linear vibration motor 13 operates to generate vibration. The scissors introduced into the outer blade 15 are cut by being sandwiched between the outer blade 15 and the vibrating inner blade 14.

<Linear vibration motor>
Next, the configuration of the linear vibration motor will be described in detail. As shown in FIG. 2, the linear vibration motor 13 has a frame 21 that is fixed to the housing 12. A stator 22 is fixed to the lower part of the frame 21. The stator 22 is an electromagnet in which a conductive wire 24 is wound in a coil shape around a core 23 made of a magnetic material. Inside the frame 21, a vibrator 25 connected to the inner blade 14 is provided. Both ends of the vibrator 25 in the vibration direction (left-right direction in FIG. 2) and the inner surface of the frame 21 are connected by compression coil springs 26 and 26, respectively. The vibrator 25 is made of a synthetic resin material or a nonmagnetic material. A permanent magnet 27 is provided below the vibrator 25 so as to be exposed to the outside. The permanent magnet 27 is two-pole magnetized in the vibration direction. The permanent magnet 27 faces the stator 22 with a predetermined interval in the vertical direction. Therefore, the vibrator 25 can be reciprocated along the vibration direction against the elastic force of the two compression coil springs 26, 26 or using the elastic force.

<Drive control device for linear vibration motor>
Next, a drive control device for the linear vibration motor 13 will be described. As shown in the lower part of FIG. 2, the drive control device 30 includes a control unit 31 and a battery state detection unit 32.

  The battery state detection unit 32 detects the remaining capacity of the battery (primary battery) 33 built in the housing 12. In this example, the battery state detection unit 32 detects the voltage across the battery 33 as the state of the battery 33 and determines a decrease in the remaining capacity of the battery 33 based on the detection result. When it is detected that the voltage at both ends of the battery has dropped to the threshold value Vh for detecting a remaining capacity drop, the battery state detection unit 32 generates a detection signal indicating that. The control unit 31 can determine whether the voltage across the battery 33 has decreased based on whether the detection signal is generated. The threshold value Vh is set to a value larger than the minimum operating voltage of the control unit 31.

  The control unit 31 has a non-volatile storage device (not shown). In this storage device, various control programs and data for overall control of the linear vibration motor 13 are stored. The control unit 31 performs power feeding control on the stator 22 through execution of the control program stored in the storage device.

  The control unit 31 generates driving power for the linear vibration motor 13 using the power of the battery 33 and applies the generated driving power to the stator 22. More specifically, the control unit 31 performs PWM (pulse width modulation) control of the drive current for the stator 22 through a drive circuit (not shown). The drive circuit is an inverter circuit in which four switching elements such as MOSFETs are connected in an H-bridge type. Each switching element is turned on and off based on a control signal (PWM signal) that is a pulse wave generated in the control unit 31, thereby switching the direction of the drive current supplied to the stator 22. In other words, the drive current Id1 in the first direction indicated by the dashed arrow in FIG. 2 and the drive current Id2 in the second direction indicated by the solid arrow in FIG. Are supplied alternately.

  When a drive current is supplied to the stator 22, the permanent magnet 27 of the vibrator 25 is driven along a specific vibration direction while bending the compression coil springs 26 and 26 according to the direction of the drive current. The direction of the magnetic field generated in the stator 22 is switched by switching the direction of the drive current at an appropriate timing through the control of the control unit 31. As a result, the vibrator 25 vibrates along a specific vibration direction against the elastic force of the two compression coil springs 26, 26 or using the elastic force. As the vibrator 25 vibrates, the inner blade 14 connected to the vibrator 25 also vibrates.

In this example, a normal control mode and a cleaning control mode are set as the control mode of the linear vibration motor 13 by the control unit 31.
The normal control mode is a control mode for cutting a ridge. In this control mode, the linear vibration motor 13 is driven with a vibration amplitude suitable for cutting a ridge through control of the pulse width (duty ratio) of the PWM signal. When the switch 16 is operated while the linear vibration motor 13 is stopped, the drive of the linear vibration motor 13 is controlled in the normal control mode.

  The cleaning control mode is a control mode for cleaning a blade portion such as the inner blade 14. In this control mode, the linear vibration motor 13 is driven with a vibration amplitude suitable for cleaning the blade portion through control of the pulse width of the PWM signal. During the execution of drive control in the normal control mode, the transition is made from the normal control mode to the cleaning control mode when a predetermined control mode transition condition is satisfied. The control mode transition condition includes operating a switch for switching a control mode (not shown) or detecting that the accumulated use time in the normal control mode has reached a threshold time. When transitioning from the normal control mode to another control mode, the control unit 31 executes power feeding control (PWM control) so that the vibration amplitude of the linear vibration motor 13 differs from that in the normal control mode before and after the transition. . In this example, before and after the transition of the control mode, the vibration amplitude of the linear vibration motor 13 is made smaller than that in the normal control mode.

  The control unit 31 also executes the following control. That is, the control unit 31 indicates that the remaining capacity of the battery 33 detected through the battery state detection unit 32 has decreased to the threshold value Vh for detecting a remaining capacity decrease during execution of power supply control in the normal control mode, for example. When the determination is made, stop control that is power supply control for stopping the linear vibration motor 13 is executed. In this example, when the execution of the stop control is started, the degree of temporal change in the vibration amplitude of the linear vibration motor 13 before and after the start is before and after the transition from the normal control mode to the cleaning control mode. Power supply control is executed so as to be smaller than the above degree.

  The storage device of the control unit 31 stores information related to the pulse width (duty ratio) of the control signal used in the power supply control and the stop control in the normal control mode and the cleaning control mode, respectively. Yes. The control unit 31 sets the pulse width of the control signal using information on the pulse width stored in the storage device.

<Drive control method of linear vibration motor>
Next, a drive control method for the linear vibration motor will be described.
First, power supply control in the normal control mode will be described. As shown in FIG. 3A, in the normal control mode, power feeding is controlled such that the vibration amplitude and frequency of the vibrator 25 are constant values suitable for cutting the heel. That is, as shown in FIGS. 3B and 3C, the control unit 31 includes a first control signal (right output in the figure) for controlling the drive current in the first direction with respect to the stator 22, and Then, a second control signal (left output in the figure) for controlling the driving current in the second direction with respect to the stator 22 is generated. The pulse widths (duty ratios) of the first and second control signals are fixed at the pulse widths determined for normal use. Further, the phases of the first control signal and the second control signal are shifted by about a half cycle. As a result, as shown in FIG. 3D, the drive current supplied to the stator 22 is a pulsed current (pulse current) corresponding to the phase difference and pulse width of the first and second control signals. It becomes. As shown in the figure, the direction of the drive current supplied to the stator 22 is switched according to the pulse periods of the first and second control signals.

<Normal control mode → Stop control>
Next, the transition from the normal control mode to the stop control will be described. As shown in FIG. 3E, the voltage across the battery 33 gradually decreases with the use of the electric razor. Then, when it is detected that the voltage across the battery 33 has dropped to the threshold value Vh through the battery state detection unit 32 and the detection signal is input from the battery state detection unit 32 (timing T1), the control unit 31 stops. Start execution of control.

  That is, as shown in FIGS. 3B and 3C, the control unit 31 gradually sets the pulse widths of the first and second control signals toward the stop of the linear vibration motor 13. As a result, as shown in FIG. 3D, the amount of drive current supplied to the stator 22 gradually decreases according to the degree of decrease in the pulse width of the first and second control signals. . As shown in FIG. 3A, the vibration amplitude of the vibrator 25 gradually decreases toward the stop of the linear vibration motor 13 as the drive current amount decreases. Since the vibration amplitude of the inner blade 14 gradually decreases toward the stop, the sudden stop of the linear vibration motor 13 when the voltage across the battery 33 decreases is avoided.

<Normal control mode → Cleaning control mode>
Next, the transition from the normal control mode to the cleaning control mode will be described. When it is determined that the predetermined control mode transition condition is satisfied during execution of power supply control in the normal control mode, the control unit 31 transitions the control mode of the linear vibration motor 13 to the cleaning control mode. .

  That is, as shown in FIGS. 4B and 4C, when the control unit 31 starts executing the power supply control in the cleaning control mode (timing T2), the first and second control signals are displayed. Is fixedly set to a pulse width determined for cleaning. The pulse width for this cleaning is set to be smaller than the pulse width at the normal time. In the examples of FIGS. 4B and 4C, the pulse width for cleaning is set to about 1/3 of the pulse width at the normal time. As a result, as shown in FIG. 4D, the drive current amount supplied to the stator 22 is smaller than the normal drive current amount according to the pulse widths of the first and second control signals. Become. Here, the driving current at the time of cleaning is about ½ of the normal time. As shown in FIG. 4A, the vibration amplitude of the vibrator 25 is halved compared to the normal time as the drive current amount is halved. As shown in FIGS. 5A and 5B, the degree of the temporal change in the vibration amplitude before and after the transition from the normal control mode to the cleaning control mode is the transition from the normal control mode to the stop control. It is smaller than the degree before and after.

<Comparison of temporal change in vibration amplitude>
Next, a temporal change in the vibration amplitude of the linear vibration motor 13 when the normal control mode is changed to the cleaning control mode and the stop control is compared based on the graph of FIG. In the graph, the horizontal axis represents time, and the vertical axis represents the amplitude of the vibrator 25. Also, in this graph, the temporal change in vibration amplitude when transitioning from the normal control mode to the stop control of this example is a solid line, and the temporal change in vibration amplitude when transitioning from the normal mode to the cleaning control mode Is indicated by a chain line. In addition, as a comparative example, a change with time in vibration amplitude when the degree of change in vibration amplitude when transitioning to stop control is made larger than when transitioning to the control mode for cleaning is indicated by a one-dot chain line.

  As shown in the graph, the temporal change amount A of the vibration amplitude of the linear vibration motor 13 before and after the transition from the normal control mode to the stop control of this example is the control for cleaning from the normal control mode. This is considerably smaller than the temporal change amount B of the vibration amplitude of the linear vibration motor 13 before and after the transition to the mode. The difference between the temporal changes A and B of the vibration amplitude is such that it is appealed to the user's hearing as a clear difference in the operating sound of the linear vibration motor 13. That is, as a result, the pulse widths of the first and second control signals in the stop control and the cleaning control mode are set so that the difference in operating sound can be clearly identified by the user.

  Thus, according to the drive control method of this example, the degree of change in the operating sound before and after the start of the stop control of the linear vibration motor 13 is clearly compared with the degree of change in the operating sound before and after the transition of the control mode. It will be small. For this reason, depending on the difference in the degree of change in the operating sound, the user can hear whether the operating sound changes due to the stop control accompanying the decrease in the remaining battery capacity or the operating sound changes due to the transition of the control mode. It becomes possible to identify clearly through. Therefore, confusion between the stop operation caused by the decrease in the remaining power supply capacity and the operation caused by the transition to the specific control mode can be suppressed.

  It should be noted that the difference between the degree of temporal change in amplitude during stop control and the degree of temporal change in amplitude during control mode transition is preferably as large as possible. The greater the difference in degree, the easier it is to identify the operating sound through hearing.

  Here, it is also conceivable to vary the operation sound at the time of transition to the stop control mode and the cleaning control mode as follows. That is, contrary to this example, the temporal change amount C of the vibration amplitude before and after the transition to the stop control is made larger than the temporal change amount B of the vibration amplitude before and after the transition to the cleaning control mode. . In this case, although the difference in the temporal change amount of the vibration amplitude certainly occurs, the tendency of the temporal change of the vibration amplitude before and after the transition to the stop control and the cleaning control mode is set for each control. There is a possibility that the same change tendency may be observed until the vibration amplitude corresponding to the pulse width of the control signal is reached. That is, at each of the transition to the cleaning mode and the transition to the stop control, the vibration amplitude drops rapidly with the same tendency. In this case, although it is a short time, there is a concern that it is difficult to identify the operation sound.

  Therefore, as in this example, the temporal change amount A of the vibration amplitude of the linear vibration motor 13 before and after the transition from the normal control mode to the stop control is the transition amount from the normal control mode to the cleaning control mode. It is preferable to make it smaller than the temporal change amount B of the vibration amplitude of the linear vibration motor 13 before and after. This is because, as the temporal change amount A of the vibration amplitude of the linear vibration motor 13 before and after the transition from the normal control mode to the stop control is reduced, the transition to the stop control and the transition to the cleaning control mode are performed. This is because the region in which the vibration amplitude changes in the same tendency decreases. That is, according to the drive control method of the present example, immediately before and after the transition to the stop control and before and after the transition to the cleaning control mode, the temporal change in the vibration amplitude, and thus the change in the operating sound, is immediately different. Cheap. In the example of FIG. 6, the vibration amplitude drops sharply at the transition to the cleaning mode, whereas there is almost no drop in vibration amplitude at the transition to the stop control. This difference in temporal variation in vibration amplitude can be clearly identified as a difference in operating sound.

<Effect of Embodiment>
Therefore, according to the present embodiment, the following effects can be obtained.
(1) A difference in vibration amplitude or frequency of the linear vibration motor 13 is appealed to the user's hearing as a difference in the operation sound of the linear vibration motor 13. By utilizing this fact, in this example, the degree of temporal change in vibration amplitude before and after the start of stop control of the linear vibration motor 13 is set higher than the degree before and after the transition from the normal control mode to another control mode. Make it smaller. By doing so, the degree of change in the operating sound before and after the start of the stop control of the linear vibration motor 13 can be made smaller than the degree of change in the operating sound before and after the transition of the control mode. In other words, depending on the difference in the degree of change in the operating sound, the user can hear whether the operating sound is changed due to the stop control accompanying the decrease in the remaining battery capacity or the operating sound is changed due to the transition of the control mode. It becomes possible to identify. Therefore, confusion between the stop operation caused by the decrease in the remaining power supply capacity and the operation caused by the transition to the specific operation mode can be suppressed. The difference between the degree of temporal change in amplitude during stop control and the degree of temporal change in amplitude during control mode transition is preferably as large as possible. The greater the difference in degree, the easier it is to identify the operating sound through hearing.

  (2) The stator 22 is pulse-driven. For this reason, the amplitude of the linear vibration motor 13 can be easily controlled through pulse control during stop control or the like. Similarly, the frequency of the linear vibration motor 13 can be controlled.

(3) The linear vibration motor 13 of this example is suitable for small electric devices such as an electric razor.
<Second Embodiment>
Next, a second embodiment of the present invention will be described. This example is different from the first embodiment in that power feeding is feedback-controlled based on the amplitude of the linear vibration motor. Therefore, the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 7, the drive control device 30 includes a drive detection unit 41. This drive detection part 41 is connected to the 1st and 2nd terminal of the stator 22 which is an electromagnet, respectively. The drive detection unit 41 detects the amplitude of vibration of the vibrator 25 based on the voltage induced in the stator 22 and generates an electrical signal corresponding to the detected amplitude. When the control unit 31 transitions from the normal control mode to the stop control, the control unit 31 detects the vibration amplitude at that time based on the electrical signal generated in the drive detection unit 41. And the control part 31 feedback-controls the electric power feeding with respect to the stator 22 so that the degree of the time change of the amplitude before and behind the transition to stop control may become as small as possible.

  As shown in the graph of FIG. 8, the degree of temporal change in the vibration amplitude before and after the transition to the stop control by executing feedback control of power supply based on the amplitude (hereinafter referred to as “amplitude feedback control”). Is smaller than when the amplitude feedback control is not executed. In the graph, the horizontal axis represents time, and the vertical axis represents the vibration amplitude of the vibrator 25. In the graph, the temporal change of the vibration amplitude when the amplitude feedback control is not executed is indicated by a one-dot chain line, and the temporal change of the vibration amplitude when the amplitude feedback control is executed is indicated by a solid line.

Therefore, according to the present embodiment, the following effects can be obtained.
(4) The control unit 31 feedback-controls power feeding to the linear vibration motor 13 according to the detection result of the drive detection unit 41, that is, the vibration amplitude at that time. For this reason, when changing from the normal control mode to the stop control, the degree of temporal change in the vibration amplitude can be further reduced as compared with the case where the vibration feedback control is not executed. In addition, optimal power supply control can be performed depending on the time.

<Third Embodiment: FIGS. 9 to 11>
Next, a third embodiment of the present invention will be described. This example differs from the second embodiment in that an external power supply can be connected.

  As shown in FIG. 9, an external power source 51 can be connected to the drive control device 30 of this example via a power adapter (not shown). As the external power source 51, for example, a commercial power source is assumed. In this case, an AC-DC adapter that converts AC power supplied from a commercial power source into DC power suitable for the operation of the control unit 31 is employed as the power adapter.

  As shown in FIGS. 10E and 10F, the external power supply 51 is connected after the decrease in the remaining capacity of the battery 33 is detected and the stop control of the linear vibration motor 13 is started. In this case (timing T3), it is conceivable that the power supply control in the normal control mode based on the power of the external power supply 51 is immediately started. In this case, as shown in FIGS. 10A to 10D, since the vibration amplitude of the linear vibration motor 13 is not fully attenuated while the stop control is being executed, it is based on the power from the external power source 51. By the power supply control in the normal control mode, the vibration amplitude of the linear vibration motor 13 increases rapidly. That is, when the vibrator 25 reciprocally moves in a manner of colliding with the frame 21, there is a possibility that a hitting sound or a roaring sound is generated.

  Therefore, in this example, when the external power supply 51 is connected to the drive control device 30 during execution of the stop control, the power supply to the linear vibration motor 13 is stopped for a certain period. That is, as shown in FIGS. 11 (e) and 11 (f), the control unit 31 detects the decrease in the remaining capacity state of the battery 33 and starts executing the stop control of the linear vibration motor 13. When 51 is connected (timing T4), the generation of the first and second control signals is stopped for a certain period. More precisely, as shown in FIGS. 11B and 11C, the control unit 31 sets the pulse widths (duty ratios) of the first and second control signals to 0 (zero) during the certain period. Set to. As a result, as shown in FIG. 11D, the drive current supplied to the stator 22 is also 0 (zero). As shown in FIG. 11A, the vibration amplitude of the linear vibration motor 13 is attenuated during this fixed period. And when the said fixed period passes, as shown to Fig.11 (a)-FIG.11 (d), the control part 31 starts execution of the electric power feeding control in a normal control mode again. By performing power supply in the normal control mode after the amplitude of the linear vibration motor 13 is attenuated during the certain period, the amplitude of the vibration gradually increases with time.

Therefore, according to the present embodiment, the following effects can be obtained.
(5) When connection of the external power source 51 is detected during execution of stop control due to a decrease in the remaining capacity of the battery 33, power supply to the linear vibration motor 13 is stopped for a certain period. By attenuating the amplitude of the linear vibration motor 13 during this fixed period, an increase in vibration due to power supply based on the power of the external power supply 51 is mitigated. Therefore, by suppressing a sudden amplitude increase, the generation of a beeping sound is also suppressed.

<Fourth embodiment>
Next, a fourth embodiment of the present invention will be described. This example is different from the third embodiment in that the control mode and the like are displayed. This example has basically the same configuration as that of the third embodiment.

  As shown in FIG. 12, a display unit 61 is connected to the control unit 31. The display unit 61 displays the remaining capacity of the battery 33 and the control mode at that time, and is provided in a manner exposed on the surface of the housing 12 of the electric razor 11. The display unit 61 includes a light emitting element such as a plurality of LEDs (light emitting diodes). The control unit 31 varies the number of light emitting elements to be turned on according to the remaining capacity of the battery 33 or turns on a specific light emitting element according to the type of the control mode. The control unit 31 generates a display command for the display unit 61 according to the remaining capacity of the battery 33 and the type of control mode. The display unit 61 performs display based on the display command.

  As shown in FIG. 13, when operating in the normal control mode, the control unit 31 displays a message to that effect on the display unit 61. Further, when the execution of the stop control is started during the operation in the normal control mode (timing T5), the display unit 61 displays that the remaining capacity of the battery 33 has decreased, that is, that the stop control is being executed. Let Furthermore, as shown in FIG. 14, when the linear vibration motor 13 is stopped through the stop control (timing T <b> 6), the fact that the battery 33 has stopped due to the decrease in the remaining capacity is displayed on the display unit 61.

  In this example, the control unit 31 displays the remaining capacity state of the battery 33 and the control mode according to the detection result of the battery state detection unit 32, but the remaining capacity state and At least one of the control modes at that time may be displayed on the display unit 61. Even in this case, when the execution of the stop control is started, this is also displayed on the display unit 61. Further, in this example, the display unit 61 is a light emitting element such as an LED, but a liquid crystal display, for example, can also be employed.

Therefore, according to this example, the following effects can be obtained.
(6) By displaying that the remaining capacity of the battery 33, the control mode, and the operation stop due to the stop control are displayed, the user is notified in an easy-to-understand manner that “stop due to a decrease in remaining capacity” and “stopped”. be able to. Further, through the display on the display unit 61, confusion between the transition to the stop control due to the decrease in the remaining capacity of the battery 33 and the transition to the control mode for cleaning that is another control mode can be suppressed.

<Fifth embodiment>
Next, a fifth embodiment of the present invention will be described. In this example, as shown in FIG. 15, a secondary battery 71 is employed instead of the previous battery 33, which is a primary battery, as an operating power source for the electric razor 11 (more precisely, the linear vibration motor 13). . The electric power of the secondary battery 71 is supplied to the control unit 31. The control unit 31 supplies power to the linear vibration motor 13 using the power of the secondary battery 71. In this case, an external power supply 51 can be connected to the drive control device 30 as in the third embodiment. When the external power supply 51 is connected, the power from the external power supply 51 is supplied to the secondary battery 71 and the control unit 31, respectively.

Therefore, according to this example, the following effects can be obtained.
(7) By providing the secondary battery 71 as an operating power source for the electric razor 11, repeated charging is possible. For this reason, the linear vibration motor 13 which can be used repeatedly and by extension, the electric shaver 11 can be constructed | assembled.

<Other embodiments>
The embodiment described above may be modified as follows.
In the first to fifth embodiments, the remaining capacity of the battery 33 is estimated based on the voltage across the battery 33. However, the state of the battery 33 is detected based on a physical quantity other than the voltage. Also good. For example, the accumulated usage time of the electric razor 11 (linear vibration motor 13) is measured, and the remaining capacity of the battery 33 is estimated based on this measured value.

In the first to fifth embodiments, when the control mode is changed to the cleaning control mode, the linear vibration motor 13 can be automatically stopped after a predetermined time has elapsed.
In the first to fifth embodiments, the electric shaver 11 having the cleaning control mode is given as an example of the control mode other than the normal control mode, but the electric mode having the control mode other than the cleaning mode is taken as an example. Each embodiment can also be applied to the razor 11. For example, the present invention can be applied to a device having a control mode for deep shaving or a control mode for shallow shaving. Depending on the type of control mode, before and after the transition from the normal control mode to another control mode, at least one of the amplitude or frequency of vibration of the linear vibration motor 13 is higher than that in the normal control mode. Is also envisaged.

  In the first to fifth embodiments, the PWM method is employed as the power supply control method for the linear vibration motor 13, but a PFM (frequency modulation) method may be employed. The PWM control is a control for changing the pulse width while keeping the period of the control signal that is a pulse wave constant, whereas the PFM control is the pulse period (with a constant pulse width of the control signal that is a pulse wave). Frequency). Further, for example, for each control mode, the power supply control method for the linear vibration motor 13 can be switched between the PWM method and the PFM method.

In the first embodiment, the degree of temporal change in vibration amplitude before and after the start of stop control of the linear vibration motor 13 is made smaller than the degree before and after the transition from the normal control mode to another control mode. However, it may be as follows. That is, the degree of temporal change in the vibration frequency before and after the start of the stop control of the linear vibration motor 13 is made smaller than the degree before and after the transition from the normal control mode to another control mode. Similar to the vibration amplitude, the difference in the vibration frequency of the linear vibration motor 13 is also appealed to the user's hearing as the difference in the operating sound of the linear vibration motor 13. For this reason, the effect similar to (1)-(3) of 1st Embodiment can be acquired. This modification is applicable to the second to fifth embodiments. In particular, when the modification is applied to the second embodiment, frequency feedback control is executed instead of amplitude feedback control. That is, the feed control to the linear vibration motor 13 is feedback-controlled according to the detection result of the drive detection unit 41, that is, the vibration frequency at that time. Incidentally, the drive detection unit 41 can also detect the vibration frequency of the vibrator 25 based on the voltage induced in the stator 22.
In this example, an electric razor has been described as an example of a so-called small electric device, but the present invention may be applied to other small electric devices such as an electric toothbrush and an electric clipper. In this case, the same effect as in this example can be obtained.

  [Appendix A]
  When starting stop control, which is power supply control for stopping the linear vibration motor, with a decrease in the remaining capacity of the battery, is it a change in operating sound due to the execution of the stop control accompanying a decrease in the remaining capacity of the battery, Alternatively, whether or not the change in the operation sound due to the change in the control mode of the linear vibration motor due to another reason is identified by the difference in the degree of change in the operation sound of the linear vibration motor before and after the start of the stop control. As described above, the control is performed so that the degree of temporal change of at least one of the amplitude and frequency of vibration of the linear vibration motor before and after the start of the stop control is smaller than the degree before and after the change of the control mode of the linear vibration motor. Drive control device of a linear vibration motor provided with a section.
  [Appendix B]
  When starting stop control, which is power supply control for stopping the linear vibration motor, with a decrease in the remaining capacity of the battery, is it a change in operating sound due to the execution of the stop control accompanying a decrease in the remaining capacity of the battery, Alternatively, whether or not the change in the operation sound due to the change in the control mode of the linear vibration motor due to another reason is identified by the difference in the degree of change in the operation sound of the linear vibration motor before and after the start of the stop control. As described above, the degree of temporal change of at least one of the amplitude and frequency of vibration of the linear vibration motor before and after the start of the stop control is made smaller than the degree before and after change of the control mode of the linear vibration motor. Drive control method for vibration motor.

  11: Electric razor (small electric equipment)
  12: Housing
  13: Linear vibration motor
  14: Inner blade
  15: Outer blade
  16: Switch
  21: Frame
  22: Stator
  23: Core
  24: Conductor
  25: Vibrator
  26: compression coil spring
  27: Permanent magnet
  30: Drive control device
  31: Control unit
  32: Battery state detector
  33: Battery
  41: Drive detection part (detection part for feedback control)
  51: External power supply
  61: Display unit (display device)
  71: Secondary battery
  Vh: threshold value
  Id1: Drive current
  Id2: Drive current
  A: Time change
  B: Time variation
  C: Time variation

Claims (9)

In the drive control device of the linear vibration motor that generates vibration using the power of the battery,
A battery state detection unit that detects a remaining capacity state of the battery, and a control unit that controls at least one of the amplitude and frequency of the vibration through power supply control to the linear vibration motor,
The control unit has a normal control mode as a control mode of the linear vibration motor, and another control mode,
When it is detected through the battery state detection unit that the remaining capacity of the battery has decreased during execution of power supply control in the normal control mode, stop control that is power supply control for stopping the linear vibration motor is executed. And
When transitioning from the normal control mode to another control mode, power supply control is executed so that at least one of the amplitude and frequency of the vibration is different from that in the normal control mode before and after the transition,
In the power supply control, whether the operation sound is changed due to the execution of the stop control accompanying a decrease in the remaining capacity of the battery, or the change in the operation sound accompanying the transition from the normal control mode to the other control mode Is at least one of the amplitude and frequency of the vibration before and after the start of the stop control, so that it can be identified by hearing according to the difference in the degree of change related to the operating sound of the linear vibration motor before and after the start of the stop control. The degree of temporal change is made smaller than that before and after the transition from the normal control mode to the other control mode.
Drive control device for linear vibration motor.   In the drive control device of the linear vibration motor that generates vibration using the power of the battery,
  A battery state detection unit that detects a remaining capacity state of the battery, and a control unit that controls at least one of the amplitude and frequency of the vibration through power supply control to the linear vibration motor,
  The control unit has a normal control mode as a control mode of the linear vibration motor, and another control mode,
  When it is detected through the battery state detection unit that the remaining capacity of the battery has decreased during execution of power supply control in the normal control mode, stop control that is power supply control for stopping the linear vibration motor is executed. And
  When transitioning from the normal control mode to another control mode, power supply control is executed so that at least one of the amplitude and frequency of the vibration is different from that in the normal control mode before and after the transition,
  When the execution of the stop control is started, the degree of temporal change of at least one of the amplitude and frequency of the vibration before and after the start is determined before and after the transition from the normal control mode to the other control mode. The power supply control is executed so as to be smaller than the degree in
  When the control unit detects that an external power source is connected after starting the execution of the stop control, the control unit stops the power supply control for the linear vibration motor for a certain period, and then executes the power supply control in the normal control mode. Start
  Drive control device for linear vibration motor. Before SL control unit, the vibration amplitude by controlling a pulse current as the power supply control, and controls at least one frequency
The drive control apparatus of the linear vibration motor of Claim 1 or 2 . The amplitude of pre-Symbol vibration, and includes a feedback control detecting unit for detecting at least one frequency,
The control unit feedback-controls power feeding to the linear vibration motor according to a detection result of the feedback control detection unit.
The drive control apparatus of the linear vibration motor as described in any one of Claims 1-3 . Prior Symbol controller, the state of the remaining capacity of the battery corresponding to the detection result of the battery state detecting unit, and causes display on the external display device at least one of the control mode, start the execution of the stop control When doing so, display on the display device to that effect
The drive control apparatus of the linear vibration motor as described in any one of Claims 1-4 . Before SL control unit, the rear stop of the linear vibration motor, to be displayed on the display device that has stopped due to a decrease in the remaining capacity of the battery
The drive control apparatus of the linear vibration motor of Claim 5 . Before Symbol battery is a secondary battery
The drive control apparatus of the linear vibration motor as described in any one of Claims 1-6 .   A small-sized electric apparatus provided with the drive control apparatus of the linear vibration motor as described in any one of Claims 1-7. In the drive control method of a linear vibration motor that generates vibration using the power of the battery,
The control mode of the linear vibration motor has a normal control mode, and other control modes,
When it is detected that the remaining capacity of the battery has decreased during execution of power supply control in the normal control mode, stop control that is power supply control for stopping the linear vibration motor is performed,
When transitioning from the normal control mode to another control mode, power supply control is executed so that at least one of the amplitude and frequency of the vibration is different from that in the normal control mode before and after the transition,
In the power supply control, whether the operation sound is changed due to the execution of the stop control accompanying a decrease in the remaining capacity of the battery, or the change in the operation sound accompanying the transition from the normal control mode to the other control mode Is at least one of the amplitude and frequency of the vibration before and after the start of the stop control, so that it can be identified by hearing according to the difference in the degree of change related to the operating sound of the linear vibration motor before and after the start of the stop control. The degree of temporal change is made smaller than that before and after the transition from the normal control mode to the other control mode.
Drive control method for linear vibration motor.

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