JP3013180B2 - Sound display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is a pronunciation display device that performs various displays with sound corresponding to display contents, and is particularly suitable for use with a device that easily generates low-frequency noise. About things.

2. Description of the Related Art Conventionally, this type of sound display device is always connected to a power supply and continues in a standby state. Regardless of whether or not the content to be displayed is determined, power is amplified as it is when a low-frequency signal is generated. Generally, a speaker generates sound.

[Problems to be Solved by the Invention] However, when used integrally with a device such as an inverter circuit that easily generates low-frequency noise, such a noise signal is guided to the display device side, and is output from the speaker as noise. was there.

For such a problem, it is conceivable to energize the power amplifying means after confirming that significant sound is generated.However, if the energization and the stop are repeated frequently, the operation becomes unstable, and the display itself becomes audible. There are problems, such as suffering.

The present invention has been made in view of such a problem,
It is an object of the present invention to provide a pronunciation display device having excellent display quality while saving power.

[Means for Solving the Problems] A sound display device according to the present invention has a sound signal generating means for generating a series of sound electric signals based on data stored in a memory, as schematically shown in FIG. A power amplifying means for amplifying the acoustoelectric signal generated by the means, and a means for converting the amplified acoustoelectric signal into sound, and further comprising a power supply restricting means for restricting a power supply timing to each of the above means. And a sound conversion restricting means that can control the sound conversion time of the sound converting means.

Further, the above-described energization restricting means causes energization to be performed in response to a time when an acoustic signal is required to be generated by the acoustic signal generation means. In response to the, it is possible to continuously generate significant and insignificant acoustoelectric signal, the above-mentioned acoustic conversion regulation means, at least corresponding to the time of occurrence of the insignificant signal in the acoustoelectric signal, The input of the acoustoelectric signal to the acoustic conversion means is stopped.

[Operation] With the above-described configuration, when sound display is required, for example, when a predetermined detection operation is performed, the power supply to each means is started by releasing the regulation of the power supply restricting means, and a state in which sound display is possible is established. I do. In this state, when a control signal such as a microcomputer is sent from the control means to the acoustic signal generating means, the acoustic signal generating means continuously generates significant and insignificant acoustic electric signals.

During the operation of generating the acoustic electric signal and during the period in which the significant electric signal to be displayed is generated, the output electric signal is further amplified by the power amplifying means, and then the sound is converted by the sound converting means such as a speaker. Will be displayed as

On the other hand, when an unintended electric signal is generated, the sound conversion restricting means forcibly stops the input of the electric signal to the sound converting means, so that noise or other unnecessary display is prevented beforehand.

[Embodiment] Hereinafter, the present invention will be described based on an example in which the present invention is applied to an electric razor. However, the present invention is not limited to this, and it can be applied to various small electric devices that perform predetermined pronunciation display with sound such as voice. Of course.

As shown in FIG. 2, an electric shaver 1 embodying the present invention has an outer blade 2 detachably mounted on an upper portion of a main body case 3 and an inner blade 4 slidably disposed inside the outer blade 2. I do. Further, inside the main body case 3, a motor 5 for reciprocatingly driving the inner blade 4, a secondary battery 6 for supplying a rotational driving power to the motor 5, a charge control for the secondary battery 6 or a rotation control of the motor The electronic circuit 7 for performing various controls such as the above is housed. In addition, a knob 8 of a slide switch for regulating the timing of energizing the motor 5 is provided at the center of the front of the main body case 3.
A light-emitting display unit 10 is provided below the switch knob 8 to display the operating state of the electric shaver 1 with light by blinking a plurality of light-emitting diodes, while a speaker 11 is provided on the back side of the main body case 3. The display unit 12 includes a pronunciation display unit 12 for displaying sound such as voice. In addition, a power plug 13 (not shown) provided with a power plug 13 at the lower portion of the main body case 3 to enable charging of the rechargeable battery 6 is provided on the lower end of the main body case 3. The case 3 is detachably inserted into the case 3 so that the motor 5 can be directly driven by a commercial AC power supply.

FIG. 3 is a block diagram schematically showing the entire electronic circuit 7 built in the main body case 3 described above.
An inverter circuit 15 for converting an AC voltage of, for example, 100 to 120 V supplied from 14 to a predetermined charging voltage; a rotation control circuit 16 for controlling a rotation state of the motor 5; and a detection unit for constantly detecting an operation state of the electric shaver. 17, a light-emitting display unit 10 that displays the detection state with light based on various detection signals extracted from the detection unit 17, a sound display unit 12 that displays the detection state with sound, and a central control unit that performs various control operations. 20 and the detector
17 or an output control circuit 21 forcibly stopping the oscillation of the inverter circuit 15 by a control signal input from the central control unit 20.

The motor 5 is supplied with electric power from the secondary battery 6 via the switch 22, and the rotation control circuit 16 and a rotation detection circuit 23, which will be described later, operate the motor 5 irrespective of fluctuations in the battery voltage or lightness of the load applied to the motor 5. An approximately constant motor rotation speed can be maintained.

The central control unit 20 has a plurality of input / output ports, and the detection unit 17
Various types of detection information output from the input port can be captured from the input port, and the captured information is used as control data to perform arithmetic control operations in accordance with a program stored in the ROM and described later. A control signal is appropriately output to the output control circuit 21, the light emitting display unit 10, and the sound display unit 12.

The detection unit 17 includes an AC input detection circuit 24 and an inverter circuit 15
The switch operation detection circuit 25 detects whether the commercial AC power supply 14 is connected to the power supply, and whether the motor drive switch 22 is turned on, and determines the operation mode of the electric shaver 1. Information.

Further, while the secondary output detection circuit 26 detects an abnormality of the output voltage from the inverter circuit 15, the rotation detection circuit 23 detects the rotation state of the motor 5 and the rotation abnormality detection circuit 27.
Then, the state where the motor 5 remains locked despite the power being supplied to the motor 5 is detected, and in any case, a signal is sent to the output control circuit 21 to forcibly stop the inverter circuit 15, and The circuit 15 is protected.

Further, in the lower limit voltage detection circuit 28, the terminal voltage of the secondary battery 6 is detected during a period in which the switch 22 is turned on, and when the terminal voltage of the secondary battery 6 falls below the set value, the central control unit 20 Send a signal to inform.

When the terminal voltage of the secondary battery 6 falls below the lower limit voltage as well, the operation of the central control unit 20 is in an indefinite state, so that the reset circuit 29 operates to reset the central control unit 20 to an initial state.

The light emitting display unit 10 includes a display 31 that displays an operation state in which the switch 22 is turned on, and a display 33 that operates only during charging detected by the charging detection circuit 32 and displays the charging state. Have.

On the other hand, the sounding display unit 12 is energized via the switching circuit 34 when predetermined content to be displayed is specified by the central control unit 20 irrespective of whether the motor 5 is driving or charging.
A series of audio signals corresponding to the display contents are formed by an audio synthesizing circuit 36 to which a driving voltage is supplied by a DC-DC converter 35, and the signals are amplified by a power amplifier circuit 37, and then displayed by a speaker 11 with sound.

Hereinafter, based on the electric circuit diagrams shown in FIGS. 4 to 7,
The configuration of FIG. 3 will be described more specifically.

(Inverter Circuit) As shown in FIG. 4, the inverter circuit 15 includes a rectifier circuit 42 having a diode bridge 40 and a filter 41 on the input side, and rectifies the commercial AC power supply 14 input via the power plug 13 or the power cord. After being subjected to full-wave rectification by the circuit 42, the voltage is applied to the inverter circuit 15 through the temperature fuse 43.

The inverter circuit 15 includes a primary coil 45 on the collector side of the output transistor 44, and includes a feedback coil 46 and a capacitor 47 between the base and the emitter. Furthermore, the output coil 48 is wound on the same iron core as the primary coil 45, and the energy stored in the primary coil 45 when the output transistor 44 is turned on can be extracted from the output coil 48 via the rectifying diode 49 when the output transistor 44 is turned off. It is configured like this.

(Output Control Circuit) The output control circuit 21 has a collector terminal of a switching transistor 51 connected to a base terminal of an output transistor 44 constituting the inverter circuit 15 and an emitter terminal of the transistor 51 grounded. The secondary output detection circuit 26, the rotation abnormality detection circuit 27 or the central control unit 20.
At the same time that a control signal of “H” level is input to the base end of the transistor 51 from any one of
51 turns on, grounds the base end of the output transistor 44 in the inverter circuit 15, and forcibly stops the oscillating operation of the inverter circuit 15.

(Detection unit) The AC input detection circuit 24 divides the output voltage from the rectifier circuit 42 with the resistors 52 and 53, and enables the transistor 54 to be turned on with this voltage. Although an “H” level signal is applied to the collector end of the transistor 54 via the port, when the AC power supply 14 is input, the transistor 54 is turned on and the collector is grounded, so that the central control unit 20 Send the “L” level detection signal,
Notifies that commercial AC power supply 14 is being input.

In the present embodiment, the switch operation detection circuit 25 is a circuit in which the positive electrode of the secondary battery 6 is directly connected to the input port of the central control unit 20 via the switch 22 and the resistor 55,
“H” which is the terminal voltage of the secondary battery 6 when the switch 22 is turned on
A signal is sent to the central control unit 20 to notify that the motor 5 is being energized.

The secondary output detection circuit 26 is connected in parallel to the output coil 48 of the inverter circuit 15, smoothes the output voltage from the output coil 48 by the diode 56 and the capacitor 57, and outputs the voltage value of the commercial AC power supply 14. Generates a signal having a magnitude corresponding to. This signal is applied to the base end of the transistor 51 after being divided by the resistors 58 and 59 of the output control circuit 21,
When the output voltage from the output coil 48 exceeds a set value, the inverter circuit 15 is forcibly stopped to prevent an excessive current from flowing through the secondary battery 6.

As shown in FIG. 5, the lower limit voltage detection circuit 28 performs the detection operation only during the motor driving period by the transistor 61 which is turned on in conjunction with the ON operation of the switch 22, and the terminal voltage of the secondary battery 6 Is divided by the resistors 62 and 63 to take out the detection voltage, which is compared with the reference voltage formed by a constant voltage element such as a diode 64 or a varistor by the comparator 65 to output a detection signal of "H" level normally. However, when the voltage falls below a preset lower limit voltage, it changes to “L”, and sends a detection signal to the central control unit 20 to notify that charging is necessary.

As shown in FIG. 6, the rotation detecting circuit 23 operates in conjunction with the turning-on operation of the switch 22, and first detects the movement of the motor rotating shaft by using a photo interrupter 66 including a light emitting diode and a phototransistor. Upon detection, a signal having a frequency corresponding to the rotation speed of the motor 5 is generated. This signal is further input to a filter circuit 67, and only an AC signal having a frequency component corresponding to the rotation cycle of the motor 5 is selectively sent to a waveform shaping circuit 68. The waveform shaping circuit 68 includes a comparator
While the output signal from the filter circuit 67 is input to the negative input terminal of 69, a reference voltage obtained by dividing the secondary battery voltage by a resistor is applied to the positive terminal, and a resistor is further applied to the output terminal.
A diode 71 is connected to the secondary battery 6 via 70, and from both ends of the diode 71, the diode 71 is connected.
The peak value is regulated by the forward voltage 71, and a detection signal having a frequency proportional to the motor rotation speed is output. When the motor 5 rotates normally, the detection signal maintains a constant duty ratio of, for example, about one-half, regardless of the change in the rotation speed. When the ratio increases and the motor rotation is completely stopped,
Maintain “H” level as it is.

When the rotation of the motor 5 is locked and the output signal from the rotation detection circuit 23 is fixed at the “H” level or the rotation speed is reduced, the rotation abnormality detection circuit 27 outputs “H” to the output control circuit 21. "A signal is sent to stop the inverter circuit 15. That is, an AC signal is formed by turning on and off the transistor 72 connected in parallel with the secondary battery 6 with the output signal from the rotation detection circuit 23, and this signal is smoothed by the filter circuit 73, and Is applied to the base end of the transistor 74 connected to Therefore, while the motor 5 is rotating normally (about 7600 rpm), a predetermined on-voltage is applied to the base end of the transistor 74, and the collector end of the transistor 74 is grounded and no detection signal is output. When the input signal from is constant at or near the “H” level, the transistor
The base voltage of 74 is lower than the ON voltage, and an “H” signal is sent to the output control circuit 21 via the diode 75. Specifically, the transistor smoothed by the voltage smoothed by the filter circuit 73
The number of rotations at which 74 turns off is set to about 300 rotations.

The output signal from the rotation detection circuit 23 is output from a comparator 77 which is activated only when the switch 22 is turned on by the transistor 76.
After the inversion of the signal and the level conversion, the signal is sent to the central control unit 20 so that the rotation state can be detected by software in addition to the rotation abnormality detection by the hardware described above.

(Rotation control circuit) The rotation control circuit 16 converts an input signal of a frequency corresponding to the rotation speed of the motor 5 output from the rotation detection circuit 23 into a D-
After being converted into a detection signal having a magnitude corresponding to the frequency by the A-converter 80, it is compared with a reference voltage by the comparator 81. If a deviation occurs between the two, a control signal corresponding to the value of the deviation is transmitted to the motor control circuit. 82, the voltage applied to the motor 5 is increased or decreased, and rotation speed control is performed to maintain a substantially constant rotation speed regardless of the magnitude of the load applied to the motor 5 or the level of the terminal voltage of the secondary battery 6. .

(Light-Emitting Display Unit) The light-emitting display unit 10 regulates the blinking timing of the four light-emitting diodes 85, 86, 87, and 88 by the output signals from the central control unit 20 and the detecting unit 17, as shown in FIG. Thus, the operating state of the electric shaver is indicated by light, and includes an operating state indicator 31 for displaying only when the motor 5 is driven, and a charging state indicator 33 for displaying only when charging.

The operation state indicator 31 includes a light-emitting diode 85 that lights up during a period in which the control operation in the rotation control circuit 16 is effectively working, and a light-off diode 85 that is always off but the capacity of the secondary battery 6 decreases. Then, a light-emitting diode 86 that flashes and prompts charging is connected between the downstream side of the switch 22 and the two output ports of the central control unit 20.
Only when 22 is turned on, the power for lighting is supplied and it operates.

The charge state indicator 33 uses two light emitting diodes 87 and 88 having different emission colors stored in one package.
A single output port provided in the central control unit 20 controls switching of the light emitting diodes that are lit during charging and after charging is completed, so that both states can be distinguished and displayed by a change in color. That is, one light emitting diode 87 is connected between the positive terminal of the secondary battery 6 and the output port of the central control unit 20. The other light emitting diode 88 is connected to the collector of the transistor 89.
It is connected in parallel with the light emitting diode 87 via the base end, and the charging end detection circuit connects the emitter end of the transistor 89.
Connected to 32 transistors 90.

The charging detection circuit 32 inputs the output signals from the switch operation detection circuit 25 and the AC input detection circuit 24 to the base end of the transistor 90, and turns on when the switch 22 is off and there is an AC input, thereby emitting light. It is assumed that the diode 88 can be energized.

In this configuration, if the “H” signal can be output from the output port of the central control unit 20 regardless of the state of charge of the secondary battery 6 except during charging, the two light emitting diodes 87.
Since the anode side of 88 is “H” and the charging detection circuit 32 is off, both the light emitting diodes 87 and 88 are turned off. Here, when charging is started, the transistor 90 is turned on, and further, the transistor 89 is turned on by the "H" signal from the central control unit 20, and the red light emitting diode 88, for example, indicating that charging is in progress, is turned on. Next, when charging is completed, the signal output from the central control unit 20 changes from “H” to “L”,
As a result, the transistor 89 turns off and the light emitting diode 88
Is turned off, and at the same time, for example, a green light emitting diode 87 indicating the completion of charging is turned on.

(Sound Display Unit) As shown in FIG. 7, the sound display unit 12 digitally synthesizes a series of sounds based on data stored in a memory in advance. When,
A filter circuit 91 for removing high-frequency components contained in the audio signal output from the audio synthesis circuit 36, a level adjustment circuit 92 having a grounded emitter circuit for amplifying output data to a predetermined level, and a power supply for the formed audio signal. Amplifying circuit
37 and a speaker 11 for converting the amplified audio signal into sound.
And

The DC-DC converter 35 that supplies driving power to the voice synthesis circuit 36 and the level adjustment circuit 92 described above includes a transistor
When the transistor 84 is turned off, the energy stored in the coil 83 is superimposed on the secondary battery voltage when the transistor 84 is turned off.
The voltage of the secondary battery 6 is increased from about 2V to about 5V. On the other hand, the power amplifier circuit 37 uses the secondary battery 6 as it is as a power source, and separates the power amplifier circuit 37 and the voice synthesis circuit 36 that require a large current into separate power sources. By setting the voltage on the voice synthesizing circuit 36 side sufficiently higher than that of the secondary battery 6, even if the battery capacity of the secondary battery 6 decreases, a sufficiently large voltage can be obtained.
Side to enable stable synthesis of audio signals.

Furthermore, between the secondary battery 6 and two transistors 93.
A switching circuit 34 consisting of 94 is interposed, the switching circuit 34 is normally turned off to prevent power consumption in the sound display unit 12, and the central control unit 20 responds to a sound display to be described later. A signal is sent to 34 to turn it on, and each circuit of the sound display section 12 is started and stabilized. The power amplifier circuit 37 has a mute function, and the speaker 11
Power amplifier except during the period when significant sound is output from
By suppressing or stopping the signal output from the speaker 37 to the speaker 11, the noise generated from the inverter circuit 15 and the like is prevented from being amplified by the power amplifier circuit 37 and output from the speaker 11.

(Central Control Unit) The central control unit 20 uses a so-called “one-chip microcomputer” in which various peripheral circuits such as a RAM, a ROM, or an I / O device are integrated, and stores programs stored in the ROM in advance. Therefore, a predetermined control operation is performed.

FIG. 8 is a diagram for explaining a schematic relationship of the entire program, and corresponds to “standby mode”, “charge mode”, “battery mode” in response to the presence or absence of input of the commercial AC power supply 14 and the on / off state of the switch 22. In addition to the four operation modes of "AC mode", using the standby function of the microcomputer,
The mode shifts to the basic mode at predetermined time intervals, and the detection of the change state of the operation mode or the counting operation of various counters is performed.

FIG. 9 shows an outline of a part mainly related to the operation of the light-emitting display unit 10 in a circuit pseudo-configured on the RAM by the above-described program, and shows an operation for determining a current operation mode. A mode detection unit 95, a charge counter 96 for determining the current capacity of the secondary battery 6, and a timer 97 for regulating the count operation time of the counter 96 are provided.

The operation mode detection unit 95 inputs a detection signal sent from the switch operation detection circuit 25 and the AC input detection circuit 24,
Signals corresponding to the above four operation modes are output.

When the charge counter 96 counts up or down by one at a time interval specified by the timer 97,
The counting of the set number is completed in a predetermined charging time. In this embodiment, the charging time is set to one hour, and the count number at the time of full charge is set to zero. It further includes a count number setting unit 98, and an operation mode detection unit.
By setting a numerical value that is counted once in the charge counter 96 in accordance with the operation mode detected by the switch 95, the current count value in the charge counter 96 becomes
It is configured to be proportional to the capacity of the secondary battery 6. For example, when the motor 5 is driven by the secondary battery 6, if the battery capacity runs out in 12 minutes, which is one fifth of the charging time from the time of full charge, "5" is set as the set count number,
In conjunction with the signal input from the timer 97, the charge counter 96 is incremented by "5". Note that, even in the standby state where the secondary battery 6 is left as it is, the discharge is completed in about three months from the fully charged state, but the charge counter 96 is counted by “1” which is the minimum value of the set count number. When it is up, the set value is counted in one hour. Therefore, an auxiliary counter 99 that operates during the "standby mode" is provided.
By counting up the charge counter 96 every time the auxiliary counter 99 finishes counting a predetermined number, it is possible to cope with discharging by a minute current.

As described above, the charge counter 96 increases and decreases in response to charging and discharging, and compares the current count value with the comparing unit.
When the count value falls below 0 or exceeds the set value, the count value is maintained at 100 and the value is maintained. When the count value reaches “0”, it is determined that charging is completed, and the charge state indicator 33 is charged. A signal corresponding to completion is output and displayed.

Also, the detection signal of the lower limit voltage detection circuit 28
When the lower limit voltage of the secondary battery 6 is detected as an input signal of 79, a lower limit detection flag is set, and an output signal to the operation state indicator 31 is set according to the state of the flag.

Next, the operation procedures of the four operation modes will be described based on the flowcharts shown in FIGS. 10 (a) to (d).

(Standby mode) In this mode, there is no input of the commercial AC power supply 14 and the switch 22 is turned off, and no display is made to the outside. The charge counter 96 is set for three months from the fully charged state. Count up to the value. That is,
After performing initial settings such as stopping the display in step 101 of FIG. 10 (a), the charge counter 96 is set in step 102.
"1" is set as the count number of one time. Further, each time the auxiliary counter 99 finishes counting the predetermined number in the loop of steps 103 and 104, the charge counter 96 is counted up by the count set in step 102 in step 105, and the set value is counted in step 106. If it is determined that the basic mode has been reached, the basic mode of step 107 is repeated thereafter.

(Battery Mode) This mode is a state in which the switch 22 is turned on from the standby mode to drive the motor 5, and after performing the initial setting for stopping the previous display in step 110 of FIG. 10 (b), In step 111, “5” is set as a value to be counted at one time by the charge counter 96. Step 11
At 2, the lower limit detection flag is set and it is checked whether or not the terminal voltage of the secondary battery 6 has fallen below the lower limit voltage. If NO, it is determined that a sufficient battery capacity is secured, and the operation status indicator is displayed. An ON signal is sent to the light emitting diode 85 indicating that the rotation control state in 31 is normally performed, the diode 85 is turned on and displayed with light (step 113), and in step 114, "power is OK. Is transmitted to the pronunciation display section 12 to display the control state of the motor 5 by sound. Next, in step 115,
Wait for the lower limit voltage to be detected, and if detected, step
After setting the lower limit detection flag in 116, the light emitting diode 85 illuminated in step 117 is turned off to indicate that rotation control has been disabled.

Further, if it is determined in step 112 or 116 that the lower limit detection flag has been set, step 11
In step 8, the light emitting diode 86 for displaying light that the capacity of the battery 6 is insufficient is blinked, and at step 119
Then, a voice prompt for charging and cleaning of shavings, such as "Please recharge. Please clean." When the above series of display is completed, the basic mode of step 120 is repeated.

When the switch 22 is turned off in such a state, the operation returns to the “standby mode”. In this case, even if the lower limit voltage is detected in the battery mode, the terminal voltage may increase and exceed the lower limit voltage due to self-recovery. However, the lower limit voltage is not detected in the standby mode, and therefore, the mode returns to the “battery mode”. Even if it enters, the lower limit detection flag is still set, so that the process jumps from step 112 to step 118 to display a message prompting charging.

(Charging Mode) In this mode, the switch 22 is turned off and there is an AC input, and as shown in FIG.
After performing initial settings such as stopping the display performed in the previous mode at 121, at step 122, "-1" is set as the count number of the charge counter 96.

Further, after forcibly resetting the lower limit detection flag in step 123, the light emitting diode 88 for indicating that charging is being performed in the charge status indicator 33 is turned on to display light (step 124). start."
Is displayed by voice.

After that, in a loop of steps 126 and 127, the process waits until the count value of the charge counter 96 becomes “0”. When the completion of the charging is confirmed, the light emitting diode 87 indicating the completion of the charging is turned on in step 128 to turn on the light. Is displayed at the same time as the voice is displayed in step 130, "Charging is completed." To alert the operator. At the same time, in step 129, a control signal having a 1/5 duty ratio is sent to the output control circuit 21 to control the output of the inverter circuit 15 to limit the charging current of the secondary battery 6, thereby preventing overcharging. To prevent. Thereafter, the basic mode of step 131 is repeated, and the operation mode is changed.

When the electric power that can be used for one time is charged, such a state may be detected and an audio display such as “one time use is possible” may be performed.

(AC mode) This mode is a state in which drive power is mainly supplied from the AC power supply 14 to the motor 5 by turning on the switch 22 from the charging mode. In this state, the rotation of the motor is locked. Unless otherwise, the necessary power is supplied from the AC power supply 14 regardless of the current capacity of the secondary battery 6, so that the rotation control is normally performed without checking the state of the lower limit detection flag. Display.

That is, after performing the initial setting in step 140 shown in FIG. 10 (d), in consideration of the fact that the AC mode is accompanied by a discharge from the secondary battery 6 although it is smaller than in the battery mode, in step 141, The count of the charge counter 96 is set to "3", and the corresponding light emitting diode 85 is turned on to indicate that there is enough power to control the rotation of the motor 5 (step 142).

Next, in step 143, the output signal from the rotation detection circuit 23 is checked. Here, when the motor 5 is rotating normally, the above-mentioned signal also repeats "H" and "L" for substantially the same time, but is fixed at "H" level when the motor stops. Therefore, when the signal is "L", the count value of the auxiliary counter 99 is incremented by "+2" (step 144), whereas when the signal is "H", the count value is incremented by "-1" (step 145). Since the count value increases during normal rotation and decreases when stopped, the normal rotation is determined when the predetermined value has been counted in step 146, and an audio display of "power OK" is displayed in step 147. On the other hand, when the count value decreases in step 148 and the predetermined value is counted, it is determined that the rotation is abnormal, so that the lower limit voltage is detected in step 149 without displaying a sound, and the lower limit voltage is detected. , Set the lower limit detection flag (step
After 150), the basic mode of step 151 is repeated.

If an abnormality in the motor rotation is detected in step 148, a signal is sent to the output control circuit 21 to stop the inverter circuit 15, and a voice message such as "Rotation is abnormal. Please clean." A pronunciation display may be used to alert the user.

[Effects of the Invention] As described above, the present invention is provided with the power supply regulating means for regulating the start timing of the device and the sound conversion regulating means for regulating the conversion time to sound. A sound generation operation can be performed. Furthermore, even when used together with a device in which noise generation is essentially unavoidable, the display of noise is suppressed as much as possible, and a display with sound having excellent display quality can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a basic configuration of the present invention. 2 and 3 show an example in which the present invention is applied to an electric shaver. FIG. 2 is a perspective view showing an external shape, and FIG. 3 is a block diagram showing a schematic configuration of an electronic circuit. 4 to 7 are electric circuit diagrams specifically showing the configuration of FIG. 3, in which FIG. 4 shows a power supply portion, FIG. 5 shows a light emitting display portion, and FIG. 6 shows a rotation control portion. FIG. 7 shows the sound display portion. 8 to 10 show a program-based configuration in the central control unit of FIG. 3, FIG. 8 is an explanatory diagram showing an outline of the overall configuration, and FIG. 9 is a schematic configuration of a basic mode in FIG. 10 (a) to 10 (d) are flowcharts for explaining specific operations in the four operation modes shown in FIG. 5 ... motor, 6 ... secondary battery, 10 ... light-emitting display unit, 11 ... speaker, 12 ... sound display unit, 17 ... detection unit, 20 ... central control unit, 34 ... switching circuit, 35: DC-DC converter, 36: Voice synthesis circuit, 37: Power amplifier circuit.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-275900 (JP, A) JP-A-55-121517 (JP, A) Full-fledged Sho-59-40936 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) G08B 3/10

Claims (1)

(57) [Claims] 1. An acoustic signal generating means for generating a series of acoustic electric signals based on data stored in a memory; a power amplifying means for power amplifying an acoustic electric signal generated from the acoustic signal generating means; Acoustic conversion means for converting an acoustoelectric signal power-amplified by the power amplifying means into sound, energization regulation means for regulating the energization time to each of the above-described means, and acoustic conversion time in the acoustic conversion means described above. The above-mentioned energization restricting means causes the energization to be performed in response to the time when the generation of the acoustic electric signal is necessary in the acoustic signal generating means. A significant and insignificant acoustoelectric signal can be continuously generated in accordance with the energization timing by the energization restricting means. The sound generation display device, wherein the step stops input of the acoustoelectric signal to the acoustic conversion means at least in response to a generation time of an unintended signal in the acoustoelectric signal.