JPH0984075A - Selective radio call receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce production of abnormal sound in the case of a call notice by a vibrator. SOLUTION: A vibrator 12 is driven with a power supply 14 using a dry battery or the like and whose output voltage is VB when a call notice is started and a power supply is used for the power supply after the start and driven by a constant voltage circuit 13 whose output voltage is VS. When a call is detected, a decoder 3 outputs a drive signal C1 to a vibrator control section 11 and the control section 11 starts the vibrator 12 by a voltage VB of the power supply 14. When a prescribed time elapses from the start, the decoder 3 gives a control signal C2 to the control section 11 and a drive voltage of the vibrator 12 is replaced with an output voltage VS of the constant voltage circuit 13. When the call notice is finished, the decoder 3 stops the transmission of the drive signal C1 and the control section 11 stops supply of power to the vibrator 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio selective call receiver which performs call notification by vibrating a vibrator.
In particular, the present invention relates to a radio selective calling receiver with improved vibration sound control of the vibrator.

[0002]

2. Description of the Related Art In a conventional radio selective call receiver of this type, noise or abnormal noise (generally referred to as abnormal noise hereinafter) may occur with the rotation of a motor, which is a main element of a vibrator. This abnormal noise impairs the original function of the silent vibrator, such as the occurrence of resonance in a slight gap between the components of the radio selective calling receiver and the case, the rotation noise of the motor, and the like. In order to reduce the generation of abnormal noise when the vibrator vibrates, in addition to mechanically preventing abnormal noise,
A method of performing electrical control is disclosed in Japanese Patent Laid-Open No. 5-316016 (Title of Invention: Radio selective calling receiver and vibrator driving method). That is, in the disclosure gazette, the fact that the rotation speed of the motor changes according to the motor drive voltage is used to detect the sound pressure of the abnormal noise, and the sound pressure of the abnormal noise that generates the motor drive voltage is minimized based on this result. Are controlled.

[0003]

In the above-mentioned conventional radio selective calling receiver, a sound pressure detecting circuit for detecting the sound pressure of the abnormal noise generated by the vibrator and the motor driving voltage in multiple stages based on the detection result. Since a variable voltage circuit to be changed is required, the receiver configuration and the drive voltage control procedure are complicated, and therefore it is difficult to downsize and the economical efficiency is not good.

Further, in the radio selective calling receiver, it is always required to reduce the power consumption by not only the vibrator but also all the constituent elements.

[0005]

SUMMARY OF THE INVENTION A radio selective call receiver according to the present invention comprises a decoder for activating and controlling a call notification when a call by a radio selective call signal is detected, and a vibration based on the activation and control of the call notification. In a radio selective call receiver that includes at least a vibrator that performs call notification according to, the vibrator is driven by a first power source that generates a first output voltage when the call notification is activated, and after activation of the call notification, It is driven by a second power supply that produces a second output voltage that is lower than the first output voltage.

In the radio selective calling receiver, the first power source is a primary power source of the radio selective calling receiver, and the second power source is the first output voltage from the first power source. Can be stabilized to generate the second output voltage.

One of the radio selective call receivers starts driving the vibrator by the first power supply when receiving a first driving signal from the decoder, and the decoder drives the vibrator after a predetermined time elapses from the starting. When receiving the control signal of 1, the vibrator is switched from the first power supply to the second power supply.
It is possible to adopt a configuration including a vibrator control unit that is driven by switching to the power source.

Another one of the radio selective calling receivers is such that an input end is connected to a ground end of the vibrator, an output end is set to a ground potential, and a second drive signal sent by the decoder is sent to a control end. A first switch connecting the input terminal and the output terminal when receiving, a first input terminal connected to the output terminal of the first power source, and a second input terminal connected to the output terminal of the second power source The output terminal is connected to the power supply terminal of the vibrator, and when a second control signal is received by the control terminal from the decoder after a predetermined time has passed from the transmission of the second drive signal, the connection to the output terminal is performed. A second switch that switches from one input end to the second input end may be provided.

[0009]

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a radio selective call receiver according to a first embodiment of the present invention. Further, FIG. 2 is a diagram showing a drive waveform of the vibrator 12 in the present embodiment.

The radio selective calling receiver shown in FIG. 1 uses an antenna 1 to transmit a radio signal transmitted by a radio base station of a paging system.
To the wireless unit 2 via. The wireless unit 2 amplifies and demodulates the wireless signal to generate a digital signal that can be read by the decoder 3. The decoder 3 compares its own calling number previously written in the writable read-only memory (ROM) 4 with the selective calling number included in the digital signal from the wireless section 2. When the match between the two is detected, the decoder 3 activates and controls the call notification. That is, the decoder 3 drives the LED driving / amplifying circuit 5 to cause the LED 6 to emit light, and drives the speaker driving / amplifying circuit 7 when the notification mode is set by the slide switch 17 operation of the receiver of the receiver. The speaker 8 is caused to make a sound, or the vibrator control unit 11 is driven to vibrate the vibrator 12. When the wireless signal includes a message signal, the decoder 3 drives the display driver 9 to display a message on the LCD (liquid crystal display) 10.

Here, the vibrator 12 includes a motor in which the rotation speed of the motor shaft changes when the driving voltage supplied to the coil changes, and a holder for mounting the motor. The holder is attached to a case of the radio selective call receiver or a printed circuit board on which parts for the receiver are mounted. The case transmits the rotation of the motor to generate vibration. The drive voltage of the vibrator 12, that is, the drive voltage of the motor is 0.9V to 1.7V, and the drive current is 10V.
It is about 0 mA. The rotation speed of the motor generally increases as the drive voltage increases. When the rotation of the motor resonates in the space inside the case (when the rotation speed of the motor matches or approaches the resonance frequency of the space), abnormal noise is likely to occur in the receiver.

The radio selective call receiver shown in FIG. 1 has a power source 14 such as a dry battery which is a primary power source of the receiver, a clock circuit 15 for supplying an operation clock to the decoder 3, a ringing sound of the call notification speaker 8, and the like. The vibration of the vibrator 12 is stopped (reset) on the way, the reset switch 16 for erasing the message display of the LCD 10, and the RAM 18 which is a storage element for storing the data of the display message.
It has. In addition to the switching of the notification mode, the slide switch 17 allows the power source 14 to operate the decoder 3
It also switches the power supply to ON / OFF.

In the radio selective calling receiver according to the present embodiment, the power source 14 for supplying the time-varying voltage V _B as the driving power source for the vibrator 12 and the power source 14 as a power source lower than the voltage V _B and stabilized. And a constant voltage circuit 13 for generating the generated voltage V _S. Which of these two power supply circuits drives the vibrator 12 depends on the drive signal C1 and the control signal C2 from the decoder 3.
It is selected by the vibrator control unit 11 controlled by.

Now, when the carrier detects a call from the radio base station while the notification mode of the radio selective calling receiver is in the vibration (vibrator) mode, the decoder 3 controls the drive signal C1 at the time t0 by the vibrator. Send to department 11. Then, the vibrator control unit 11 closes the switch S1, which is a transistor switch, to close the power supply 1.
4 is connected to the constant voltage circuit 13 and the vibrator 1
It can be connected to 2. Before driving the vibrator 12 (during standby), the switch S2, which is a transistor switch built in the vibrator control unit 11, connects the switch S1 and the vibrator 12 to each other. Therefore, when the decoder 3 outputs the drive signal C1, the vibrator 12 is immediately activated by the voltage V _B from the power supply 14 (see FIG. 2). At the same time t0, the constant voltage circuit 13 is also activated.

After starting the vibrator 12, a predetermined time T _B
After a lapse of time, at time t1, the decoder 3 sends the control signal C2 to the vibrator control unit 11. Upon receiving the control signal C2, the vibrator control unit 11 switches the switch S2 from the power supply 14 side to the constant voltage circuit 13 side, and the vibrator 12 switches the drive voltage to the voltage V _S from the constant voltage circuit 13. The vibrator 12 then drives the drive voltage V _S.
It is driven by vibration.

After the driving of the vibrator 12 at the voltage V _S is started, when a predetermined time T _S for alerting the call elapses and time t2 is reached, the decoder 3 stops sending the drive signal C1 and again controls the control signal. Send C2. Then, the vibrator control unit 11 opens the switch S1 to stop driving the vibrator 12, and returns the switch S2 to the switch S1 side to restore the original standby state. In this radio selective calling receiver, the predetermined time T _B for starting the vibrator 12 may be 1 second or less, and the predetermined time T _S for alerting the call is set to 8 seconds or 20 seconds in the case of automatic reset. are doing.

In the receiver of this embodiment, when the vibrator 12 which requires a large current for starting the motor is started,
A power supply 14 having a high output voltage V _{B and} capable of supplying a large current is used. On the other hand, since a large current is not required for driving the motor after the vibrator 12 is started, the constant voltage circuit 13 having the low output voltage V _{S is used} as the driving power source of the vibrator 12. Further, the output voltage V _S is selected to be a voltage lower than the voltage V _B and at which the generation of abnormal noise due to the vibration of the vibrator 12 is minimized. This voltage V _S is determined by the result of an experiment of generating abnormal noise with respect to the drive voltage of the vibrator 12.

As described above, in the radio selective call receiver according to the present embodiment, the drive voltage V _S of the vibrator 12 is set to be low and the voltage causing no abnormal noise is set during most of the call notification period T _S. Therefore, it is possible to reduce the generation of abnormal noise. Also, the receiver has a lower driving voltage V _S in the period T _S, can reduce power consumption by the vibrator 12, there is an effect that it prolong the life of power supply 14 using a battery or the like.

FIG. 3 is a first flowchart for explaining the driving operation of the vibrator 12 according to the embodiment shown in FIG. FIG. 4 is the second part of this flowchart. Hereinafter, the vibrator 12 will be described with reference to FIGS. 1, 3 and 4.
The driving operation of will be described.

The carrier of this radio selective calling receiver operates the slide switch 17 to turn on the power source 14 (S401).
Y) and the vibrator mode of the notification mode are set (Y of S402). The receiver enters the standby mode and waits for a call (S403). When there is a call to this receiver (Y of S404), the decoder 3 determines the call notification by the vibrator 12 (S40).
5), the decoder 3 sends the drive signal C1 to the vibrator control unit 11 at time t0 (S406). Then, the vibrator control unit 11 activates the vibrator 12 with the output voltage V _B from the power supply 14 (S407).

When the start-up (start-up) of the vibrator 12 is completed at time t1 (S408), the decoder 3 sends a control signal C2 to the vibrator control unit 11 (S).
409). Then, the vibrator control unit 11 drives the vibrator 12 with the output voltage V _S from the constant voltage circuit 13 (S410). After this, for the T _S second period, the vibrator 12
With the rotation of the motor shaft, the ring alert is issued by vibration. When the wearer presses the reset switch 16 within the T _S second period (Y in S411), the decoder 3 causes the drive signal C
1 is stopped and the control signal C2 is sent again (S413). Further, without depression of the reset switch 16 (S 111 of N), even after T _S seconds period (S4
12 Y), the decoder 3 stops sending the drive signal C1 and sends the control signal C2 again (S413).
The vibrator control unit 11 stops driving the vibrator 12 by stopping receiving the drive signal C1 and receiving the control signal C2 again. As a result, the vibrator 12 stops vibrating (S414), and the call notification by vibration is canceled.

If there is no message in the call (S
415 N), the radio selective calling receiver returns to the standby state (S403). On the other hand, if the call has a message (Y in S415), the carrier confirms this message on the display unit 10 (S416) and presses the reset switch 16 (Y in S417). Then the decoder 3
Deletes the display of the message (S419), and this receiver returns to the standby state (S403). Even if the carrier does not press the reset switch 16, after t seconds have passed (S
(Y of 418), auto-reset by the decoder 3 is applied, and the flow proceeds to S419.

FIG. 5 is a block diagram of a radio selective call receiver according to the second embodiment of the present invention. Hereinafter, regarding the radio selective call receiver of the present embodiment, the vibrator 12
The drive operation will be mainly described.

This radio selective calling receiver has the same antenna 1, radio section 2, ROM 4, and radio selective calling receiver of FIG.
LED drive amplifier circuit 5, LED 6, speaker drive amplifier circuit 7, speaker 8, display unit driver 9, display unit 10, vibrator 12, constant voltage circuit 13, power supply 14, clock circuit 15, reset switch 16, slide switch 1
7, RAM 18 are provided. The receiver also includes a decoder 3A having substantially the same function as the decoder 3 of FIG. In this receiver, the above-mentioned circuits operate almost the same as the radio selective call receiver in FIG. 1, and therefore the description thereof will be omitted except the operation peculiar to this embodiment.

The drive circuit of the vibrator 12 includes a switch S1A in addition to the constant voltage circuit 13 and the power supply 14 described above.
And a switch S2A for switching. Power supply 14
Supplies the output voltage V _B to the first input of switch S2A. Further, the constant voltage circuit 13 outputs the output voltage V _{B of the} power source 14.
Is directly received to generate a constant voltage output voltage V _S , and this output voltage V _S is supplied to the second input terminal of the switch S2A. The output end of the switch S2A is connected to the power supply end of the vibrator 12. The ground end of the vibrator 12 is the switch S1.
The switch S1A is connected to the input terminal of A and the ground terminal of the switch S1A is set to the ground potential.

The switch S2A is normally (control signal C2A
Is L level) is the voltage from the power supply 14 (≈V _B , hereinafter V _B
Is written to the vibrator 12, and the decoder 3
When the control signal C2A of H level is received from A, the voltage supplied to the vibrator 12 is switched to the voltage from the constant voltage circuit 13 (≈V _S , hereinafter referred to as V _S ). The switch S2A has the emitter of the PNP type transistor Q1 as a first input end, the collector of the NPN type transistor Q2 as a second input end, and the collector of the transistor Q1 and the emitter of the transistor Q2 as output ends. In the switch S2A, the transistor Q1 is ON at a normal time (when the control signal C2A is at the L level) when the bases of the commonly connected transistors Q1 and Q2 serving as the control end are not receiving the control signal C2A, and the control signal is supplied to the control end. C2
When receiving A, the transistor Q2 is turned on.

The switch S1A is turned on when the H-level drive signal C1A from the decoder 3A is received at the control end, and turns on the ground end of the vibrator 12 to the ground potential. The switch S1A has the collector of an NPN transistor Q3 as an input end and the emitter as a ground end, and applies a drive signal C1A to the base of the transistor Q3 via a resistor R1 as a control end.

Next, referring to FIGS. 5 and 2, the driving operation of the vibrator 12 in the radio selective calling receiver according to the second embodiment will be described.

When the decoder 3A detects a call from the radio base station while the notification mode of the radio selective calling receiver is in the vibration mode, the decoder 3A sends a drive signal C1A of H level to the switch S1A at time t0. Then, the switch S1A is turned on, the voltage V _B from the power source 14 is supplied to the vibrator 12, and the vibrator 1
The vibration of 2 is activated. At this time, the control signal C2
Since A is at L level, the transistor Q1 is ON. After the start of the vibrator 12, when a predetermined time T _B elapses and time t1 is reached, the decoder 3A sends an H level control signal C2A to the switch S2A. Control signal C2A
When the switch S2A receives the voltage, the switch S2A supplies the voltage V _S from the constant voltage circuit 13 to the output terminal, and the vibrator 12 switches the drive voltage to the voltage V _S from the constant voltage circuit 13. After that, the vibrator 12 is oscillated by the voltage V _S.

After the switching of the drive voltage, at time t2 after a lapse of a predetermined time T _S for calling notification, the decoder 3A stops sending the drive signal C1A and the control signal C2A. Then, the switch S1A turns off,
The driving of the vibrator 12 is stopped. At the same time,
The switch S2A returns the source of the power supply voltage to the first input terminal.

As described above, the radio selective call receiver according to the second embodiment also performs the same operation as the radio selective call receiver according to the first embodiment. Therefore, similarly, abnormal noise is generated. There is an effect that the life can be reduced and the life of the power source 14 using a dry battery or the like can be extended.

[0033]

As described above, according to the present invention, when the call notification is activated, the vibrator is driven by the first power source which generates the first output voltage, and after the call notification is activated, the vibrator is driven by the first power source. Since it is driven by the second power supply that generates the second output voltage lower than the output voltage of, there is an effect that generation of abnormal noise during vibration of the vibrator can be reduced.

Further, according to the present invention, since the drive voltage after the vibrator is activated is lower than the output voltage of the first power source,
There is an effect that the life of the first power supply can be extended.

[Brief description of drawings]

FIG. 1 is a block diagram of a radio selective call receiver according to a first embodiment of the present invention.

FIG. 2 is a diagram showing drive waveforms of a vibrator 12 in the embodiment of FIG.

FIG. 3 is a first part of a flowchart explaining a driving operation of the vibrator 12 according to the embodiment of FIG.

FIG. 4 is a second part of a flowchart illustrating a driving operation of the vibrator 12 according to the embodiment of FIG.

FIG. 5 is a block diagram of a radio selective call receiver according to a second embodiment of the present invention.

[Explanation of symbols]

 1 Antenna 2 Radio Unit 3, 3A Decoder 4 Read Only Memory (ROM) 5 LED Drive Amplification Circuit 6 LED 7 Speaker Drive Amplification Circuit 8 Speaker 9 Display Driver 10 Display (LCD) 11 Vibrator Control 12 Vibrator 13 Constant Voltage Circuit 14 power supply 15 clock circuit 16 reset switch 17 slide switch 18 RAM S1, S1A, S2, S2A switch Q1-Q3 transistor R1 resistor

Claims (4)

[Claims] 1. A wireless selective call including at least a decoder for activating and controlling call notification when a call by a wireless selective call signal is detected, and a vibrator for performing call notification by vibration based on the activation and control of the call notification. In the receiver, the vibrator is driven by a first power supply that generates a first output voltage when the call notification is activated, and a second output voltage that is lower than the first output voltage is activated after the call notification is activated. Radio selective call receiver, characterized in that it is driven by the resulting second power supply. 2. The first power supply is a primary power supply of the radio selective calling receiver, and the second power supply stabilizes the first output voltage from the first power supply to obtain the first output voltage. The radio selective call receiver according to claim 1, wherein the output voltage of 2 is generated. 3. The vibrator is activated by the first power supply when the first drive signal is received from the decoder, and the vibrator is activated when a first control signal is received from the decoder after a predetermined time has elapsed from the activation. 3. The radio selective calling receiver according to claim 2, further comprising a vibrator control unit that switches and drives the power source from the first power source to the second power source. 4. The input terminal is connected to the ground terminal of the vibrator, the output terminal is set to the ground potential, and when the control terminal receives the second drive signal sent from the decoder, the input terminal and the output terminal are connected. And a first input terminal connected to an output terminal of the first power source, and a second input terminal connected to the second switch.
Is connected to the output end of the power supply of the vibrator, the output end is connected to the power supply end of the vibrator, and when a second control signal is received at the control end from the decoder after a predetermined time has elapsed from the transmission of the second drive signal, the output is output. The radio selective calling receiver according to claim 2, further comprising a second switch that switches a connection to an end from the first input end to the second input end.