JP3872844B2 - Drive device for vibration actuator - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a drive device for a vibration actuator in a portable electronic device including a vibration actuator such as a small vibration motor, a speaker-type vibration device, and a plunger-type vibration device using a battery as a drive source.
[0002]
[Prior art and problems]
Conventionally, a small pager (pager), a mobile phone, and the like have a built-in vibrator in a pager or the like as a call notification means at a place where alarm sound transmission is interrupted during a meeting or a hospital. By switching to the vibration mode in advance, the vibrator is driven instead of outputting an alarm sound when a call is received, and the call can be detected by the vibration. A small motor is generally used for such a vibrator, and an eccentric weight or the like is attached to the rotating shaft of the motor, and the motor is rotated by battery driving to generate vibration.
[0003]
Conventionally, a small vibration motor that can rotate at a low voltage has been developed as such a motor. Generally, a pager battery is an AA-type, AAA-type dry battery or a rechargeable battery, and the voltage is 1.2 V or more. It is about 1.5V. For this reason, it is difficult to start the motor, and it may not rotate even when the motor is turned on.
[0004]
For this purpose, it is possible to use a high-voltage power supply only at the start-up so that the motor can easily start rotating even at a low voltage. When the battery voltage drops, it is difficult to rotate and there is a problem that a sufficient vibration force cannot be obtained. In particular, as a recent trend, ultra-compact ultra-small diameter vibration motors are required, and due to the progress of miniaturization, the inertia of eccentric weights etc. is small and easy to start, but low voltage drive due to the small inertia However, there was a problem that a large vibration force could not be obtained.
[0005]
The object of the present invention is to solve the above-mentioned drawbacks and to easily detect vibration by receiving a continuous, intermittent or discontinuous pulse signal instead of a regular signal when a call is received. Thus, the present invention provides a drive device for a low-power vibration actuator that can obtain a sufficient vibration force while being battery-driven even if it is small and has a very small diameter.
[0006]
[Means for Solving the Problems]
The present invention has been made to solve the above-described conventional problems, and in the vibration actuator driving device according to claim 1, the voltage of the built-in battery 1 is set in a portable device that drives the vibration actuator by battery driving. A booster circuit 2 for converting to a high voltage, a power feeding circuit 3 including a pulse oscillation circuit for outputting a continuous, intermittent or discontinuous power feeding operation to the vibration actuator 4 and a forward / reverse rotation circuit are provided. continuous DC voltage or AC voltage, is obtained so as to applied to the intermittent or discontinuous pulses.
[0007]
In the vibration actuator drive device according to the second aspect of the present invention, a pulse transmission is performed in which the booster circuit 2 that converts the voltage of the built-in battery 1 into a high voltage and the power feeding operation to the vibration actuator 4 are performed continuously, intermittently, or discontinuously. The vibration actuator 4 is provided with a power supply circuit 3 including a circuit and a forward / reverse rotation circuit, adjusts the width of an applied pulse, and applies signals having different pulse widths to the forward / reverse rotation circuit. This mode signal is generated.
[0008]
[Action]
According to the vibration actuator driving apparatus of the first aspect, the battery 1 as the original power source has a low voltage. However, since the voltage is boosted to a high voltage by the booster circuit 2, the battery 1 is driven by a low voltage and requires a small amount of power. Even in such a case, the small vibration actuator can be driven at the same high speed as the high voltage drive, so that a large vibration force can be obtained and a direct voltage is applied to the vibration actuator 4 continuously, intermittently or discontinuously. As a result, it can be called in various vibration modes, and Morse code can be generated by vibration.
[0009]
Further, as a vibration actuator, in addition to a small vibration motor, an actuator that requires switching, such as a speaker type vibration device or a plunger type vibration device, can be driven.
[0010]
According to the vibration actuator drive device of the second aspect, the DC voltage boosted to the vibration motor by adjusting the duty ratio of the applied pulse is intermittently applied only for the time when the output power of the vibration actuator becomes maximum. Therefore, the maximum vibration force can be obtained efficiently.
[0011]
【Example】
The vibration actuator driving apparatus of the present invention will be described below in detail based on the illustrated embodiments.
[0012]
FIG. 1 is a block diagram showing an embodiment of a vibration actuator driving apparatus according to the present invention, FIGS. 2 and 3 are circuit diagrams showing an embodiment of a vibration actuator driving apparatus according to the present invention, and FIG. FIG. 6 is a waveform diagram showing a terminal voltage of a vibration actuator in the circuit 3.
[0013]
In FIG. 1, a battery 1 built in a portable device is connected to a booster circuit 2 that is converted to a high voltage. Here, the booster circuit 2 has a function of converting the voltage of the battery 1, for example, 1.5 V into a high voltage of 3 to 9 V that is 2 to 6 times. The high voltage output of the booster circuit 2 is connected to a power feeding circuit 3 which drives the vibration actuator with continuous, intermittent or discontinuous pulses.
[0014]
FIG. 2 is a circuit diagram showing a specific embodiment of the vibration actuator driving apparatus according to the present invention. In this circuit, when the voltage on the output side of the booster circuit 2 is connected to E, the vibration actuator 4 vibrates in the forward and reverse continuous rotation, and the terminal voltage becomes a DC rectangular wave. FIG. 3 is a circuit diagram for driving intermittent and discontinuous forward / reverse rotation.
[0015]
The circuit will be described below. In FIG. 2, the oscillation circuit 19 is a multivibrator using transistors, and a pair of transistors Tr1 and Tr2 are charged and discharged from capacitors C2 and C1 connected to their respective bases. The output pulse signals OUT2 and OUT1 are alternately connected to the forward / reverse rotation circuits IN1 and IN2, respectively. When there is no input signal, the drive transistor is OFF and the motor 14 is not driven. However, when a signal for turning on the transistor is applied to Tr11 and Tr13, the forward or reverse operation is started.
[0016]
In FIG. 3, a pulse signal having a fixed period is generated from the timer circuit 20 of the reference pulse generator using Ic1 (555), and the regular pulse signal output from the output pin 3 is the counter of Ic2 (4017B). Applied to pin 14 and counted. In the counter, the circuit that is forcibly reset when the fourth pulse is input (pin 10 of IC2 <counter output 4> is connected to pin 15 of IC2 (counter reset <clear> input)) Therefore, the output of IC2 becomes 0, and the output of the counter from the fifth pulse becomes 1 again. Therefore, the counting output of 1-2-3-0 is repeated. The countered signal passes through the decoder circuit and is connected to the forward / reverse rotating circuit as an output signal at pins 2 and 3 or 2 and 7 of IC2.
[0017]
FIG. 4 is a waveform diagram of the terminal voltage of the vibration actuator. The waveform of the terminal voltage in the circuit of FIG. 2 is the waveform of (a) and (b) of FIG. The interval between T1 and T2 pulses can be set by changing the constants of capacitors C1 and C2 or R1 and R2. Therefore, the vibration mode of the vibration actuator can be changed by adjusting the amplitudes of T1 and T2.
[0018]
The waveform of the terminal voltage in the circuit of FIG. 3 is the waveform of (c) and (d) of FIG. If the output terminals 2 and 3 of Ic2 are connected to IN1 and IN2 of the forward / reverse rotation circuit, the waveform becomes (c) of FIG. 4, and if the output terminals 2 and 7 are connected, the waveform becomes (d) of FIG. The pulse width can be set by changing the constants of R1, R2, Vr, and C1.
[0019]
As described above, according to the vibration actuator driving apparatus of the present invention, the battery 1 which is the original power supply has a low voltage, but is boosted to a high voltage by the booster circuit 2. Even with low power, a small vibration actuator can be driven at the same high speed as high voltage driving, so that a large vibration force can be obtained and a DC voltage is continuously, intermittently or discontinuously applied to the vibration actuator 4. Because it is applied, it can be called in various vibration modes and Morse code by vibration can also be performed.
[0020]
Next, a description will be given of a second embodiment of the drive device for the vibration actuator according to the present invention. FIG. 5 is an example of a motor characteristic diagram when a small vibration motor is used as the vibration actuator. A motor with a low load can be configured with a low-power motor if it is designed at the point of E1 in FIG. 5 where efficiency is good, but in order to experience vibration like a vibration actuator, the output power of E2 is maximum. Designing to the point can generate the maximum vibration force most efficiently.
[0021]
In the present invention, in order to generate the maximum vibration force, the load and energization time are calculated, and the duty ratio T1 / T2 of the applied pulse is adjusted so as to drive at the point E2 in FIG. Since the direct current voltage is intermittently applied only for the time when the output power of the vibration motor is maximized, the maximum vibration force can be obtained efficiently.
[0022]
In the present invention, as a vibration actuator, in addition to a small vibration motor, there is an actuator that requires switching such as a speaker-type vibration device or a plunger-type vibration device by applying an AC voltage continuously, intermittently, or discontinuous pulses. Since it can be driven, it can be applied to a wide range of portable devices. Further, if the built-in electric potential is a high voltage such as a lithium electric potential, the booster circuit can be omitted.
[0023]
【The invention's effect】
According to the present invention, as described in detail in the embodiment, the battery 1 that is the original power supply has a low voltage, but the voltage is boosted to a high voltage by the booster circuit 2 and then supplied to the vibration actuator 4 by pulse driving only for a short time. By doing so, a small vibration motor can be driven at the same high speed as high voltage driving even with low power by low voltage battery driving, and a large vibration force can be obtained.
[0024]
In addition, since a small vibration motor can be driven intermittently because of pulse driving, a large vibration force can be obtained, and a continuous, intermittent or discontinuous pulse of DC voltage is applied to the vibration actuator 4. It is possible to provide a drive device for a vibration actuator that easily senses vibration. Furthermore, calling can be performed in various vibration modes, and Morse code by vibration can also be performed.
[0025]
Furthermore, according to the vibration actuator driving apparatus of the second embodiment of the present invention, the DC voltage boosted to the vibration motor by adjusting the duty ratio of the applied pulse is intermittently generated only for the time when the output power of the vibration actuator becomes maximum. Therefore, the maximum vibration force can be obtained efficiently.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of a drive device for a vibration actuator according to the present invention.
FIG. 2 is a circuit diagram showing an embodiment of a vibration actuator driving apparatus according to the present invention;
FIG. 3 is a circuit diagram showing an embodiment of a drive device for a vibration actuator according to the present invention.
4 is a waveform diagram showing terminal voltages of vibration actuators in the circuits of FIGS. 2 and 3. FIG.
FIG. 5 is a motor characteristic diagram when a small vibration motor is used as the vibration actuator.
[Explanation of symbols]
1 Battery 2 Booster Circuit 3 Feeder Circuit 4 Vibration Actuator

Claims (2)

  In a portable device that drives a drive actuator by battery drive, a booster circuit that boosts the voltage of the battery, and after the voltage is boosted by the booster circuit, power feeding operation to the vibration actuator is performed continuously, intermittently, or discontinuously A vibration actuator comprising a pulse oscillation circuit for outputting a signal and a forward / reverse rotation circuit, and applying a continuous, intermittent or discontinuous pulse to the vibration actuator after boosting a DC voltage from the battery Drive device.   2. The vibration actuator drive device according to claim 1, wherein when a signal is input to the vibration actuator by the pulse oscillation circuit, the pulse width and the rise time of the vibration actuator that reaches a target amplitude are set close to each other.

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