JPH11136756A - Incoming call detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an incoming call detector that operates for a long time without any external power supply and monitors a drive capability of a drive power supply and recognizes an incoming call to any of pluralities of kinds of portable radio telephone sets without the need of holding a receiver. SOLUTION: An antenna 1 selectively receives a carrier signal emitted by a portable telephone set or the like, a high frequency amplifier section 2 amplifies the signal, a binarized signal of the detection result is given to a timer section 4. The timer section 4 outputs pulses in a prescribed length. The timer section 4 does not detect a new incoming call for about 5 sec after the end of a preceding incoming call. A lamp drive section 5 receives the pulse and blinks LEDs 1-3 while the pulse is at a high level. A power supply section 6 provided with a battery E1 supplies power to each section and a solar battery E2 charges the battery E1. A power consumption control section 7 supplies power to a broad band amplifier Q1 intermittently. Furthermore, the lamp drive section 5 discriminates an electromotive force of the battery E1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an incoming call detector of a mobile communication terminal.

[0002]

2. Description of the Related Art Conventionally, a device for detecting an incoming call of a portable wireless telephone without holding the portable wireless telephone with a hand or the like has been used. An example of such a device is an incoming call notification device disclosed in Utility Model No. 2515077.

The incoming call alerting device disclosed in Utility Model No. 2515077 is independent of a radio telephone, and a response signal transmitted by the radio telephone in response to a call signal from a base station to the radio telephone. To detect the presence or absence of radio wave reception and obtain a voltage corresponding to the change in the electric field. Then, after amplifying the voltage, based on the voltage, drive control of a vibration device, a light generator, a display, a sound generator, etc., switch to an in-car communication device, etc., and generate a control signal. Or send it.

[0004]

Such a device for detecting an incoming call of a portable radio telephone is usually carried and used together with a portable radio telephone to be detected, and an external power supply is used. It is necessary to be able to drive for a long time without receiving a supply.

[0005] In addition, if the user does not notice that the power supply has been cut off due to, for example, running out of batteries,
A situation occurs in which the user does not notice despite the incoming call. Therefore, it is necessary to prevent such a situation.

[0006] In recent years, the service contents of portable radio telephones have been diversified, and portable radio telephones and PHS (Personal H
It is becoming more common to carry multiple types of portable wireless telephone handsets at the same time, such as the andy phone System). In an environment where a plurality of types of portable radio telephones are used at the same time, if both the device for detecting the incoming call of the mobile phone and the device for detecting the incoming call of the PHS are not carried, the incoming call to one of the wireless telephones is made. Even if there is, the user may not notice the incoming call. On the other hand, as a provider of a device for detecting an incoming call, it is necessary to design, manufacture, and supply a mobile phone and a PHS separately, which poses a problem that the burden is large. Therefore,
There is a demand for an incoming call detection device that can detect an incoming call of a multi-system portable wireless telephone with one incoming call detection device.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide an incoming call detector that can be driven for a long time without being supplied with power from the outside and that can monitor the supply capability of drive power. I do. Another object of the present invention is to provide an incoming call detector capable of detecting that there is an incoming call to any of a plurality of types of portable wireless telephones without holding the handset.

[0008]

In order to achieve the above object, an incoming call detector according to a first aspect of the present invention includes an antenna for receiving a carrier signal radiated by a portable telephone and a PHS (Personal Handy phone System). Amplifying means having an active element for inputting and amplifying the carrier signal received by the antenna, and inputting the carrier signal amplified by the amplifying means, and detecting a detection signal indicating that the carrier signal has been received. Detection means for outputting, a notification timer means for detecting the detection signal and outputting a drive timing signal for a predetermined period from the time of detection, and inputting the drive timing signal and inputting the drive timing signal During, incoming notification means for driving the light emitting element,
The amplification unit, the detection unit, the notification timer unit, a secondary battery that supplies power for operating at least one of the incoming notification unit, and receives light to generate an electromotive force, And a power supply unit having a solar cell that charges the secondary battery with an electromotive force.

Such an incoming call detector detects that there is an incoming call to a portable telephone or a PHS among a plurality of types of portable radio telephones, even if the receiver is not held. Also,
In such an incoming call detector, the secondary battery is charged not by an external power source but by the solar battery. Therefore, such an incoming call detector is driven for a long time without being supplied with power from the outside. Further, such an incoming call detector is excellent in visibility in that it emits light when there is an incoming call, thereby notifying the incoming call.

A call detector according to a second aspect of the present invention includes a portable telephone and a PHS (Personal Handy phone).
An antenna for receiving a carrier signal emitted by the antenna, an amplifying unit including an active element for receiving and amplifying the carrier signal received by the antenna, and inputting the carrier signal amplified by the amplifying unit; Detecting means for outputting a detection signal indicating whether or not a carrier signal has been received; a detection timer means for detecting the detection signal and outputting a drive timing signal for a predetermined period from the time of detection; and Input, incoming notification means for notifying to the outside that the mobile phone or the PHS is emitting the carrier signal, the amplifying means,
A secondary battery for supplying power for operating at least one of the detection means, the notification timer means, and the incoming call notification means; and a light receiving element for generating an electromotive force by receiving light; And a power supply unit having a solar battery for charging the secondary battery.

[0011] Even with such an incoming call detector, it is detected that there is an incoming call to a mobile phone or a PHS among a plurality of types of portable radio telephones without having to hold the handset. Further, in such an incoming call detector, the secondary battery is charged not by an external power source but by the solar battery. Therefore, such an incoming call detector is driven for a long time without being supplied with power from the outside.

Further, the incoming call detector according to a third aspect of the present invention is a portable telephone and a PHS (Personal Handy phone).
An antenna for receiving a carrier signal emitted by the antenna, an amplifying unit including an active element for receiving and amplifying the carrier signal received by the antenna, and inputting the carrier signal amplified by the amplifying unit; Detecting means for outputting a detection signal indicating whether or not a carrier signal has been received; a detection timer means for detecting the detection signal and outputting a drive timing signal for a predetermined period from the time of detection; and Input, incoming notification means for notifying to the outside that the mobile phone or the PHS is emitting the carrier signal, the amplifying means,
A power supply unit for supplying power for operating at least one of the detection unit, the notification timer unit, and the incoming call notification unit is provided.

[0013] Even with such an incoming call detector, it is detected that there is an incoming call to a portable telephone or a PHS among a plurality of types of portable radio telephones without having to hold the handset.

If the power supply means includes a power supply intermittent supply means for intermittently supplying power to the active element provided in the amplification means, the power supplied to the active element is controlled by the power supply intermittent supply. Limited by means. For this reason, such an incoming call detector is driven for a longer time without being supplied with power from the outside, as compared with a configuration not including the power supply intermittent supply means.

[0015] The incoming call detector, at a predetermined timing,
If the power supply means is provided with a power supply inspection means for determining whether or not the power supply means has the ability to supply the power and notifying the determination result to the outside, the secondary battery has a sufficient electromotive force. Is checked.

The reception detector detects the detection signal, and includes a re-reception monitoring means for preventing the notification timer means from outputting the drive timing signal more than once within a predetermined period from the time of the detection. It may be provided.
This prevents a situation in which a number of incoming calls are detected many times in a short time even though there is actually only one incoming call due to a bad radio wave propagation condition or the like.

The antenna does not need to indiscriminately supply the carrier signal radiated from the portable telephone and the carrier signal radiated from the PHS to the amplifying means, and the antenna is not limited to the portable telephone. And a carrier signal radiated from the PHS and a carrier signal radiated from the PHS may be selectively supplied to the amplifying means. Further, the amplifying means indiscriminately supplies a carrier signal radiated from the mobile phone and received by the antenna and a carrier signal radiated from the PHS and received by the antenna to the detecting means. It is not necessary that the amplification means selectively supplies a carrier signal radiated from the mobile phone and received by the antenna and a carrier signal radiated from the PHS and received by the antenna to the detection means. It may be.

An incoming call detector according to a fourth aspect of the present invention includes a portable telephone and a PHS (Personal Handy phone).
A receiving means for receiving a carrier signal emitted by the receiving means, a detecting means for receiving the carrier signal received by the receiving means and outputting a carrier detecting signal, and a predetermined period in response to the carrier detecting signal. Notification timer means for outputting a drive timing signal; and incoming notification means for notifying to the outside that the mobile phone or the PHS is emitting the carrier signal in response to the drive timing signal. It is characterized by.

Such an incoming call detector does not require a receiver to be held, and detects that there is an incoming call to a mobile phone or a PHS among a plurality of types of mobile radio telephones.

According to a fifth aspect of the present invention, there is provided an incoming call detector, comprising: an antenna for receiving a response signal emitted by a portable radio telephone; and an active amplifier for receiving and amplifying the response signal received by the antenna. Amplifying means having an element, the response signal amplified by the amplifying means is input, and a detection means for outputting a detection signal indicating whether or not the response signal is received, and the detection signal is detected and detected. Notification timer means for outputting a drive timing signal for a predetermined period from a time point; incoming notification means for inputting the drive timing signal and driving the light emitting element while the drive timing signal is being input; A secondary battery for supplying power for at least one of the notification timer means and the incoming call notification means to operate; receiving light to generate an electromotive force; And a power supply means comprising a solar cell for charging the secondary battery by, characterized in that.

Also in such an incoming call detector, the secondary battery is charged by the solar battery, not by an external power supply. Therefore, such an incoming call detector is driven for a long time without being supplied with power from the outside.

The incoming call detector detects the detection signal, and includes a re-reception monitoring means for preventing the notification timer means from outputting the drive timing signal more than once within a predetermined period from the time of the detection. If it is provided, the incoming call detector can also prevent a situation such as the fact that the incoming call is detected many times in a short time even though the incoming call is actually once.

[0023] The incoming call detector, at a predetermined timing,
If the power supply means is provided with a power supply inspection means for determining whether or not the power supply means has the ability to supply the power and notifying the determination result to the outside, even in the incoming call detector,
It is checked whether the secondary battery has a sufficient electromotive force.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An incoming call detector according to an embodiment of the present invention will be described below with reference to a portable telephone and a PHS (Personal Han).
The following describes an incoming call detector for a dy phone system) as an example.

FIG. 1 shows the basic configuration of the incoming call detector. As shown, the incoming call detector has an antenna 1
, A high-frequency amplification unit 2, a detection unit 3, a timer unit 4, a lamp driving unit 5, a power supply unit 6, and a power consumption control unit 7.

The antenna 1 is excited by a response signal generated when the mobile phone receives a call, and converts the response signal into a high-frequency amplifier 2.
To the resistor R1.

The high-frequency amplifier 2 includes a wide-band amplifier Q1 and
It comprises resistors R1, R2 and capacitors C1, C2.

One end of the resistor R1 is connected to one end of the capacitor C1 and the antenna 1, and the other end is grounded. The broadband amplifier Q1 has an input terminal, an output terminal, a power supply terminal, and a ground terminal. The ground terminal is grounded, and the power supply terminal is connected to the output terminal of the inverter Q9 of the power consumption control unit 7. The input terminal is connected to one end of the capacitor C1 that is not connected to the antenna 1. The output terminal is connected to one end of the capacitor C2. Capacitor C2
Is connected to one end of a resistor R2 and one end of a capacitor C3 of the detection unit 3, and the other end of the resistor R2 is grounded.

The resistor R1 flows a high-frequency signal generated when the antenna 1 is excited, and applies a voltage generated at both ends of the resistor R1 to the input terminal of the wideband amplifier Q1 via the capacitor C1. The resistor R1 is connected to the antenna 1 for impedance matching with the antenna 1.
Is set to a resistance value substantially equal to the characteristic impedance of.

When a predetermined range of voltage is applied between the ground terminal and the power supply terminal, the broadband amplifier Q1 amplifies the high-frequency signal supplied from the resistor R1 via the capacitor C1 and outputs the amplified signal. From the capacitor C2 to the resistor R2.

The resistor R2 flows a high-frequency signal supplied from the wideband amplifier Q1 via the capacitor C2, and applies a voltage generated at both ends of the resistor R2 to the capacitor C3 of the detector 3. The resistor R2 is set to have a resistance value substantially equal to the output impedance of the output terminal of the wideband amplifier Q1 in order to achieve impedance matching with the output terminal of the wideband amplifier Q1.

The detector 3 comprises diodes D1 and D2, capacitors C3 to C5, resistors R3 and R4, and a voltage comparator Q2.

As described above, one end of the capacitor C3 is connected to one end of the resistor R2 of the high-frequency amplifier 2, and the other end is connected to the cathode of the diode D1 and the anode of the diode D2. The voltage comparator Q2 has a non-inverting input terminal, an inverting input terminal, and an output terminal. Voltage comparator Q2
Is connected to the anode of the diode D1, one end of the resistor R4, and one end of the capacitor C5.
The other end of the resistor R4 is connected to a power supply line, and the other end of the capacitor C5 is grounded. The non-inverting input terminal of the voltage comparator Q2 is connected to the cathode of the diode D2, one end of the resistor R3, and one end of the capacitor C4. Resistor R3
The other end of the capacitor C4 is grounded. Voltage comparator Q
The output terminal 2 is connected to the input terminal of the end stable multivibrator Q3 of the timer section 4.

The diodes D1 and D2 and the capacitor C
3 to C5 operate as a voltage doubler detection circuit. Specifically, first, when the end (point A shown in FIG. 1) of the capacitor C3 connected to the high-frequency amplifier 2 becomes negative, the current flows from the ground through the capacitor C4 and the diode D1 to the capacitor C3. Is charged. At this time, no current flows through the diode D2. When the point A becomes positive, the voltage obtained by adding the voltage at the point A and the voltage generated across the capacitor C3 by charging the capacitor C3 is the non-inverting input of the voltage comparator Q2. Applied to the edge. At this time, a current flows from the capacitor C3 to the capacitor C5 via the diode D2,
5 is charged. As a result, a voltage substantially equal to the sum of the voltage at the point A and the voltage across the capacitor C3 is generated at both ends of the capacitor C5. When the point A becomes negative again, no current flows through the diode D2. However, a voltage substantially equal to the sum of the voltage at the point A and the voltage between both ends of the capacitor C3 is generated in the capacitor C5, and this voltage is supplied from the capacitor C5 to the non-inverting input terminal of the voltage comparator Q2. Is done. With the above operation, when an AC signal is input to the point A, a voltage that is almost twice the voltage of the point A when the point A has a positive polarity is supplied to the non-inverting input terminal of the voltage comparator Q2. Is done.

When the voltage at the non-inverting input terminal becomes higher than the voltage at the inverting input terminal, the voltage comparator Q2 generates a voltage sufficient to give a trigger to the monostable multivibrator Q3 of the timer section 4. I do. When the voltage at the non-inverting input terminal is lower than the voltage at the inverting input terminal, a voltage low enough not to trigger the monostable multivibrator Q3 is generated.

When no AC signal is input to the point A, the diodes D1 and D2 are connected to the power supply line from the power supply line.
A bleeder current flows to the ground via the resistor R3, the diodes D1, D2, and the resistor R4. Therefore, when an AC signal is not input to the point A, the voltage of the non-inverting input terminal of the voltage comparator Q2 becomes a lower value than the voltage of the inverting input terminal, and the input of a trigger to the monostable multivibrator is prevented. You.

However, the amount of the bleeder current needs to be such that the sum of the forward voltages of the diodes D1 and D2 is less than the threshold value of the voltage comparator Q2, and the resistance of at least one of the resistors R3 and R4 is required. The value is set to a sufficiently high value so that the bleeder current satisfies this condition.

The timer section 4 includes monostable multivibrators Q3 and Q4, capacitors C6 and C7, resistors R5,
R6 and diodes D3 and D4.

The monostable multivibrators Q3 and Q4 are
The elements are substantially the same, and each has an input terminal, an output terminal, an inverted output terminal, and a time constant setting terminal. The input terminal of the monostable multivibrator Q3 is simply connected to the output of the voltage comparator Q2 of the detection unit 3, and the output terminal is connected to the input terminal of the monostable multivibrator Q4. The output terminal of the monostable multivibrator Q4 is connected to the resistor R of the lamp driving unit 5.
7 is connected to one end. Monostable multivibrator Q4
Output terminal is connected to NAND gate Q8 of power consumption control unit 7.
And the inverted output terminal of the monostable multivibrator Q3 is not connected to any of the input terminals. One end of the capacitor C6, one end of the resistor R5, and the anode of the diode D3 for limiting the voltage at the time constant setting end are connected to the time constant setting end of the monostable multivibrator Q3. The time constant setting end of the monostable multivibrator Q4 includes one end of a capacitor C7, one end of a resistor R6,
The anode of a diode D4 that performs the same function as the diode D3 is connected. The other ends of the capacitors C6 and C7 are grounded, and the other ends of the resistors R5 and R6 and the cathodes of the diodes D3 and D4 are connected to a power supply line.

When a trigger of a predetermined voltage is applied to the input terminal of the monostable multivibrator Q3, when the trigger rises (that is, the voltage value of the input terminal changes from a low level of a predetermined value to a high level of a predetermined value). A pulse which rises substantially simultaneously with the transition to the level) is output from the output terminal. After this pulse rises, the resistor R5
Returns to a low level after a certain period (hereinafter, referred to as a period t1) determined by a product of the resistance of the capacitor C6 and the capacitance of the capacitor C6.

The pulse output from the output terminal of the monostable multivibrator Q3 is applied to the input terminal of the monostable multivibrator Q4. Thereby, the monostable multivibrator Q4 rises substantially simultaneously with the rise of the pulse, and the resistance value of the resistor R6 and the capacitor C4 rise.
6 for a certain period (hereinafter, referred to as a product of the capacitance).
The pulse which returns to the low level after the period t2) is
Output from the output end.

The inverted output terminal of the monostable multivibrator Q4 outputs a signal obtained by logically inverting the output supplied from the output terminal of the monostable multivibrator Q4. That is, the inverted output terminal of the monostable multivibrator Q4 is at a high level when the output terminal is at a low level, and is at a low level when the output terminal is at a high level.

The resistance values of the resistors R5 and R6 and the capacitances of the capacitors C6 and C7 are selected so that the above-mentioned period t2 is shorter than the period t1 by about 5 seconds. Therefore, the output terminal of the monostable multivibrator Q3 is also at the high level while the output terminal of the monostable multivibrator Q4 is at the high level, and for about 5 seconds after the output terminal is switched to the low level. Therefore, the monostable multivibrator Q3
While the output terminal of the monostable multivibrator Q3 is at a high level, even if the voltage of the input terminal of the monostable multivibrator Q3 changes due to intermittent response signals of the mobile phone, for example, Has no substantial effect.

The lamp driving section 5 includes a NAND gate Q5
Inverter Q6, transistor Q7, light emitting diodes LED1 to LED3, resistors R7 to R13,
It is composed of capacitors C8 and C9.

The capacitor C8 and the resistor R8 form a series circuit. The end of the series circuit on the side of the capacitor C8 is connected to the power supply line, and the end of the series circuit on the side of the resistor R8 is connected to the monostable multivibrator of the lamp driver 5. It is connected to the output terminal of Q4.

The series circuit of the capacitor C8 and the resistor R8 functions as a differentiating circuit for differentiating the power supply voltage. That is, when the power supply voltage supplied to the capacitor C8 fluctuates, a voltage drop occurs across the resistor R8 with a value substantially proportional to the speed of change of the power supply voltage.

The NAND gate Q5 has two input terminals and 1
And an output terminal, and the inverter Q6 has an input terminal and an output terminal. One input terminal of the NAND gate Q5 is connected to a connection point between the capacitor C8 and the resistor R8, and the other input terminal is connected to one end of the resistor R8. NAN
The output terminal of the D gate Q5 is connected to the input terminal of the inverter Q7. The capacitor C9 and the resistor R9 form a series circuit. An end of the series circuit on the capacitor C9 side is connected to an output end of the inverter Q6 and one end of the resistor R10, and an end of the resistor R9 is connected to a NAND gate. It is connected to the output terminal of Q5 and the input terminal of inverter Q6. The connection point between the capacitor C9 and the resistor R9 is connected to one end of the resistor R8 which is not connected to the NAND gate Q5.

The NAND gate Q5, the inverter Q6, the resistors R8, R9, and the capacitor C9 comprise an astable multivibrator that oscillates when the input terminal of the NAND gate Q5 connected to the resistor R7 is at a high level. Is formed.

That is, when the input terminal of the NAND gate Q5 connected to the resistor R7 is at a high level, and the other input terminal of the NAND gate Q5 is at a high level, the output terminal of the NAND gate Q5 is output. Becomes low level, and the output terminal of the inverter Q6 becomes high level. At this time, the capacitor C9 is charged by the current flowing through the output terminal of the NAND gate Q5 and the resistor R9, and the voltage at the connection point between the capacitor C9 and the resistor R9 becomes the capacitor C9.
After a certain period of time determined from the capacitance of the resistor R9 and the time constant of the series circuit of the resistor R9, the low level is reached. The voltage at the connection point between the capacitor C9 and the resistor R9 is applied to one input terminal of the NAND gate Q5 via the current limiting resistor R8. As a result, the output terminal of the NAND gate Q5 becomes high level, The output terminal of Q6 is at low level. Then, the voltage at the connection point between the capacitor C9 and the resistor R9 reaches a high level after a certain period of time obtained from the above-mentioned time constant. As a result, the output terminal of the NAND gate Q5 goes low again and the inverter Q6 Output terminal again goes high. Hereinafter, the output terminal of the inverter Q6 alternates between the high-level voltage and the low-level voltage at a constant period until the input terminal connected to the resistor R7 of the NAND gate Q5 becomes low level. Output.

The transistor Q7 has base, emitter and collector electrodes, and the emitter is grounded. The other end of the resistor R10 that is not connected to the inverter Q6 is connected to the base. The cathodes of the light emitting diodes LED1 to LED3 are connected to the collector.

The anode of the light emitting diode LED1 is connected to one end of the resistor R11, the anode of the light emitting diode LED2 is connected to one end of the resistor R12, and the anode of the light emitting diode LED3 is connected to one end of the resistor R13.
The other ends of the resistors R11 to R13 are connected to a power supply line.

A resistor R1 is connected to the base of the transistor Q7.
When a high-level voltage is applied from the inverter Q6 via 0, the transistor Q7 is turned on and a collector current flows through the light emitting diodes LED1 to LED3. As a result, the light emitting diodes LED1 to LED3 are turned on.

The power supply unit 6 includes a battery E1 and a solar cell E2.
, A diode D5, a resistor R14, and a capacitor C
10 and a switch SW. The negative electrodes of the battery E1 and the solar cell E2 are grounded, the positive electrode of the solar cell E2 is connected to the anode of the diode D5, and the cathode of the diode D5 is connected to the positive electrode of the battery E1. As shown in FIG. 1, a cathode and an anode of a Zener diode D7 for stabilizing a power supply voltage may be connected to a positive electrode and a negative electrode of the battery E1. The common contact of the switch SW having one circuit and three contacts is connected to the power supply line and one end of the capacitor C10, and the other end of the capacitor C10 is grounded.
One of the non-common contacts of the switch SW (on-side contact) is connected to the positive electrode of the battery E1, and the other contact (off-side contact) is connected to one end of the resistor R14. The other end of the resistor R14 is grounded.

The solar cell E2 receives light to generate an electromotive force, and charges the battery E1 when the voltage across the battery E1 is lower than the voltage across the solar cell E2. When the voltage across the battery E1 is equal to or higher than the voltage across the solar cell E2,
The diode D5 prevents a current from flowing from the positive electrode of the battery E1 to the positive electrode of the solar cell E2. And the switch S
When W is operated and the ON-side contact and the common contact become conductive, the battery E1 applies its positive voltage to the power supply line and charges the smoothing capacitor C10. When the off-side contact of the switch SW and the common contact conduct, the connection between the power supply line and the battery E1 is disconnected, and the capacitor C10
Discharges the electric charge to the power supply line and the resistor R14.

The power consumption control unit 7 includes a NAND gate Q8
, An inverter Q9, a diode D6, and a resistor R1.
5 to 17 and a capacitor C11.

The NAND gate Q8 is connected to the NAND gate Q
5, and the inverter Q9 is substantially the same as the inverter Q6. One input terminal of the NAND gate Q8 is connected to the inverted output terminal of the monostable multivibrator Q4 of the timer unit 4, and the other input terminal is connected to one end of the resistor R15. NAND
The output terminal of the gate Q8 is connected to the input terminal of the inverter Q9. The capacitor C11 and the resistor R16 form a series circuit, and the end of the series circuit on the capacitor C11 side is connected to the output end of the inverter Q9 and the power supply end of the broadband amplifier Q1 of the high frequency amplifier 2, and the resistor R16 Is connected to the output terminal of the NAND gate Q8 and the inverter Q9.
Is connected to the input terminal of Capacitor C11 and resistor R1
6 is connected to the NAND of the two ends of the resistor R15.
The end not connected to the gate Q8 is connected. Further, the anode of the diode D6 and one end of the resistor R17 are connected to form a series circuit, and the cathode side of the diode D6 is connected to the inverter Q among both ends of the series circuit.
9 and the resistor R17 side is connected to the resistor R1.
6 and the capacitor C11.

The NAND gate Q8, the inverter Q9, the resistors R15 to R17, the capacitor C11 and the diode D6 do not oscillate when the input terminal connected to the resistor R15 of the NAND gate Q8 is at a high level. Forming a stable multivibrator. This astable multivibrator performs the same operation as the astable multivibrator formed by the NAND gate Q5, the inverter Q6, the resistors R8, R9, and the capacitor C9 of the lamp driving unit 5. Thereby, the inverter Q9 becomes
While the output terminal is at the high level, the current flowing through the output terminal drives the broadband amplifier Q1 of the high-frequency amplifier 2.

However, when the output terminal of the inverter Q9 goes high (the input terminal goes low), the capacitor C1
1 is shunted to the resistors R16 and R17, while the diode D6 cuts off the current path through the resistor R17 when the output terminal of the inverter Q9 becomes low level (the input terminal is high level). I do. Therefore, the time required for the voltage at the connection point of the capacitor C11 and the resistor R16 to change from the high level to the low level is shorter than the time required for the voltage at the connection point to change from the low level to the high level.

As a result, during one period of the oscillation, the period when the output terminal of the inverter Q9 is at the low level is longer than the period when the output terminal is at the high level, and the power consumption of the wideband amplifier Q1 is suppressed. Note that the ratio (duty ratio) of the width of the period during which the output terminal of the inverter Q9 is at the low level to the width of the period during which the output terminal is at the high level is a value determined by the resistance values of the resistors R16 and R17.

Next, the overall operation of the incoming call detector will be described. (Charging) First, when the common contact of the switch SW of the power supply unit 6 is connected to the off-side contact, the solar cell E2 supplies current to the battery E1, thereby charging the battery E1.

(Battery check immediately after power-on)
When the switch SW is operated and the common contact is connected to the ON-side contact, the battery E1 starts supplying power to the power supply line. When the supply of power to the power line is started,
A low-level voltage is output from the output terminal of the monostable multivibrator Q4 of the timer unit 4, and a high-level voltage is output from the inverted output terminal. As a result, a current flows from the power supply line to the output terminal of the monostable multivibrator Q4 through the capacitor C8 and the resistor R7 of the lamp driving unit 5. As a result, a voltage substantially equal to the power supply voltage is applied to one input terminal of the NAND gate Q5 for a certain time.

If the power supply voltage is sufficiently high and has reached the high level, the NAND gate Q5 and the inverter Q
6. The astable multivibrator formed by the resistors R8, R9 and the capacitor C9 starts oscillating.

As a result, the current flowing through the base of the transistor Q7 is intermittently and periodically supplied from the output terminal of the inverter Q6 via the resistor R10, and the transistor Q7 is turned on while a sufficient current flows through the base. In this state, current flows through LED1 to LED3. Thus, L
ED1 to LED3 blink periodically. This blinking continues while the voltage at the connection point of the capacitor C8 and the resistor R7 has reached a high level.

Immediately after the start of power supply to the power supply line, L
By confirming that ED1 to LED3 blink for a certain period of time as described above, it is confirmed that the battery E1 has a sufficient electromotive force to drive the incoming call detector.

(Power Supply to Broadband Amplifier) On the other hand, the high-level voltage output from the inverting output terminal of the monostable multivibrator Q 4 of the timer unit 4 is equal to the NA of the power consumption control unit 7.
The signal is supplied to one input terminal of the ND gate.

As a result, the astable multivibrator formed by the NAND gate Q8, the inverter Q9, the resistors R15 to R17, the capacitor C11 and the diode D6 of the power consumption control unit 7 starts oscillating, and the inverter Q
9 intermittently drives the broadband amplifier Q1 of the high-frequency amplifier 2.

(Incoming call) In this state, when a mobile phone or PHS near the antenna 1 radiates a response signal in response to a signal calling itself, the antenna 1 is excited by the response signal and transmitted to the high-frequency amplifier 2. Provides a response signal.

The high frequency amplifying unit 2 having received the response signal from the antenna 1 amplifies the input response signal and outputs the amplified response signal to the detection unit 3. The detector 3 detects the doubled voltage of the response signal supplied from the high-frequency amplifier 2, further binarizes the voltage by the voltage comparator Q 2, and outputs the binarized signal obtained as a result of the binarization to the timer 4. Supply. In the binarized signal supplied to the timer unit 4, a section in which the value is at a high level indicates a period in which the response signal is received, and a section in which the value is at a low level indicates a period in which the response signal is not received.

Monostable multivibrator Q of timer section 4
Numeral 3 inputs the binarized signal from the input terminal. When the input binary signal changes from low level to high level, the voltage at the output terminal is changed for a certain period of time (hereinafter, this time is referred to as "
t1 ").

As described above, the voltage at the output terminal of the monostable multivibrator Q3 is supplied to the input terminal of the monostable multivibrator Q4. Therefore, the voltage at the output terminal of the monostable multivibrator Q4 is constant for a certain period of time (hereinafter, this time is referred to as “t2”) after the voltage at the output terminal of the monostable multivibrator Q3 changes from low level to high level. High level.

The high-level voltage appearing at the output terminal of the monostable multivibrator Q 4
The voltage is applied to one input terminal of the gate Q5. Then NA
The astable multivibrator formed by the ND gate Q5, the inverter Q6, the resistors R8, R9, and the capacitor C9 starts oscillating.

As a result, the current flowing to the base of the transistor Q7 is intermittently and periodically supplied from the output terminal of the inverter Q6 via the resistor R10, and the transistor Q7 is turned on while the current flows to the base. Become L
A current flows through ED1 to LED3. Thereby, LED1
LED3 blinks periodically. The blinking of the LEDs 1 to 3 continues until the voltage at the output terminal of the monostable multivibrator Q4 of the timer unit 4 turns to a low level.

While the LEDs 1 to 3 are blinking, the voltage at the inverting output terminal of the monostable multivibrator Q4 of the timer section 4 is at a low level, and this low level voltage is applied to one of the NAND gates Q8 of the power consumption control section 7. It is supplied to the input end. As a result, the astable multivibrator of the power consumption control unit 7 stops oscillating, and the inverter Q9 stops driving of the wideband amplifier Q1 of the high frequency amplifying unit 2. Therefore, while LED1 to LED3 blink, the broadband amplifier Q1 does not consume power.

The monostable multivibrator Q3 is
The voltage of the output terminal is kept at a high level while the LEDs 1 to 3 are blinking and for about 5 seconds after the blinking ends. For this reason, no trigger is supplied to the monostable multivibrator Q4 for approximately 5 seconds after the end of the blinking of the LEDs 1 to 3, so that the LEDs 1 to 3 are almost 5 seconds after the end of the blinking.
It does not start blinking again for seconds.

(Power-off) When the off-side contact of the switch SW and the common contact are connected, the connection between the power supply line and the battery E1 is disconnected, and the capacitor C10 discharges electric charge to the power supply line and the resistor R14. Then, the solar cell E2 restarts charging the battery E1.

By the operation described above, the incoming call of the portable telephone is detected, and LED1 to LED3 blink for a certain period to indicate that there is an incoming call.

The configuration of the incoming call detector is not limited to the one described above. For example, the frequency band received by the antenna 1 does not need to cover both the frequency band used by the mobile phone and the frequency band used by the PHS.
May receive a radio wave in a frequency band used by any one of them.

Further, the antenna 1 and / or the high frequency amplifying section 2 include a tuning circuit for tuning to radio waves in the frequency band used by the mobile phone and the PHS, and this tuning circuit converts the radio wave emitted by the PHS and the radio wave emitted by the mobile phone. You may make it discriminate.

The antenna 1 and / or the high-frequency amplifier 2 may include a plurality of pass bands (for example, an 800 MHz band corresponding to a left, center or right peak in the graph shown in FIG. 2) as shown in FIG. (A pass band of 1.5 GHz band and 1.9 GHz band), and may have a frequency characteristic such that the maximum gain in each pass band is different. The incoming call detector is connected to the antenna 1
And, based on the amplitude of the signal that has passed through the high-frequency amplifier 2, it may be determined to which of the pass bands the signal belongs. Mobile phone and PH
If the bands used by S are different from each other (for example, the mobile phone uses the 800 MHz band and the 1.5 GHz band,
If S uses the 1.9 GHz band), the signal represents a signal radiated from either the mobile phone or the PHS based on the amplitude of the signal passing through the antenna 1 and / or the high-frequency amplifier 2. A flag is determined.

The high-frequency amplifier 2 is not limited to the above-described configuration, but may be any as long as it amplifies a signal in a frequency band used by a portable telephone and a PHS to be received. Also,
The detection unit 3 is not limited to the above configuration, and may be any unit that notifies the timer unit 4 of the presence or absence of an incoming call based on the input signal.

The timer section 4 is not limited to the above-described configuration, and detects that there is an incoming call and sets the LEDs 1 to
Any signal may be used as long as it outputs a signal for causing the LED3 to emit light, and does not instruct the LED1 to LED3 to emit light at least while the LED1 to LED3 is emitting light.

Monostable multivibrator Q of timer section 4
The relationship between the length of the period t1 which is the duration of the pulse generated by the pulse No. 3 and the length of the period t2 which is the duration of the pulse generated by the monostable multivibrator Q3 is not limited to the above, and is arbitrary. For example, the period t1 and the period t2 may have substantially the same length.

Further, the light emitting elements that the lamp driving unit 5 emits light do not need to be light emitting diodes, and the number of light emitting elements does not need to be three. The lamp driving unit 5 may further include a device that notifies an incoming call by an arbitrary method (for example, vibration) in accordance with information input from the monostable multivibrator Q4, instead of, or together with, the light emitting element.

Further, the battery of the power supply section 6 may be charged by any electromotive force source not limited to the solar cell, and may be charged by, for example, a generator rotated by a swinging pendulum. The power consumption control unit 7 may intermittently supply power to the wideband amplifier Q1 by any method. For example, in order to generate an intermittent high-level voltage, an oscillation circuit other than an astable multivibrator is used. You may. Further, the power supplied to the wideband amplifier Q1 does not need to be interrupted at a uniform cycle, and the power may be supplied for a certain period by a timer or the like.

[0085]

As described above, according to the present invention, an incoming call detector which can be driven for a long time without being supplied with power from the outside is realized. Further, according to the present invention, an incoming call detector capable of knowing which of a plurality of types of portable radio telephones has received an incoming call without holding the handset is realized.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a configuration of an incoming call detector according to an embodiment of the present invention.

FIG. 2 is a graph illustrating frequency characteristics of an antenna or a high-frequency amplifier.

[Description of Signs] 1 Antenna 2 High frequency amplifier 3 Detector 4 Timer 5 Lamp driver 6 Power supply 7 Power consumption controller C1 to C11 Capacitor D1 to D6 Diode D7 Zener diode E1 Battery E2 Solar cell LED1 to LED3 Light emitting diode Q1 Broadband amplifier Q2 Voltage comparator Q3, Q4 Monostable multivibrator Q5, Q8 NAND gate Q6, Q9 Inverter Q7 Transistor R1-R17 Resistor SW switch

Claims (12)

[Claims] 1. A mobile phone and a PHS (Personal Handy pho
ne System) an antenna that receives a carrier signal emitted by the antenna, an amplifying unit including an active element that receives and amplifies the carrier signal received by the antenna, and inputs the carrier signal amplified by the amplifying unit; Detecting means for outputting a detection signal indicating that the carrier signal has been received, and detecting the detection signal, for a predetermined period from the time of detection,
A notification timer means for outputting a drive timing signal; an input notification means for receiving the drive timing signal and driving the light emitting element while the drive timing signal is being input; an amplifying means; and the detecting means A secondary battery for supplying power for at least one of the notification timer means and the incoming call notification means to operate, generating an electromotive force by receiving light, and charging the secondary battery with the electromotive force And a power supply unit including a solar cell. 2. A portable telephone and a PHS (Personal Handy pho
ne System) an antenna that receives a carrier signal emitted by the antenna, an amplifying unit including an active element that receives and amplifies the carrier signal received by the antenna, and inputs the carrier signal amplified by the amplifying unit; Detecting means for outputting a detection signal indicating whether or not the carrier signal has been received, and detecting the detection signal, for a predetermined period from the time of detection,
Notification timer means for outputting a drive timing signal; incoming notification means for receiving the drive timing signal and notifying to the outside that the mobile phone or the PHS is emitting the carrier signal; and the amplification means The detection means, the notification timer means, a secondary battery that supplies power for operating at least one of the incoming notification means, receives light, generates electromotive force, and the electromotive force And a power supply unit having a solar battery for charging a secondary battery. 3. A mobile phone and a PHS (Personal Handy pho
ne System) an antenna that receives a carrier signal emitted by the antenna, an amplifying unit including an active element that receives and amplifies the carrier signal received by the antenna, and inputs the carrier signal amplified by the amplifying unit; Detecting means for outputting a detection signal indicating whether or not the carrier signal has been received, and detecting the detection signal, for a predetermined period from the time of detection,
Notification timer means for outputting a drive timing signal; incoming notification means for receiving the drive timing signal and notifying to the outside that the mobile phone or the PHS is emitting the carrier signal; and the amplification means And a power supply unit that supplies power for operating at least one of the detection unit, the notification timer unit, and the incoming call notification unit. 4. The incoming call detection according to claim 1, wherein the power supply means includes a power supply intermittent supply means for intermittently supplying power to the active element provided in the amplification means. vessel. 5. A power supply inspection means for judging, at a predetermined timing, whether or not the power supply means has the ability to supply the electric power, and notifying the outside of the result of the judgment. Item 5. The incoming call detector according to items 1 to 4. 6. A re-reception monitoring means for detecting the detection signal and preventing the notification timer means from outputting the drive timing signal more than once within a predetermined period from the time of the detection. The incoming call detector according to claim 1, wherein 7. The antenna according to claim 1, wherein said antenna selectively supplies a carrier signal radiated from said portable telephone and a carrier signal radiated from said PHS to said amplifying means. An incoming call detector according to any one of the preceding claims. 8. The amplifying means includes a carrier signal radiated from the mobile phone and received by the antenna,
The incoming call detector according to any one of claims 1 to 7, wherein a carrier signal radiated from an HS and received by the antenna is selectively supplied to the detection unit. 9. A mobile phone and a PHS (Personal Handy pho
receiving means for receiving a carrier signal radiated by the ne system), and inputting the carrier signal received by the receiving means,
Detecting means for outputting a carrier detection signal; notification timer means for outputting a drive timing signal for a predetermined period in response to the carrier detection signal; and in response to the drive timing signal, the mobile phone or the PHS An incoming call notifying unit that notifies the outside that the carrier signal is being emitted, wherein the incoming call is detected. 10. An antenna for receiving a response signal radiated by a portable radio telephone, amplification means having an active element for inputting and amplifying the response signal received by the antenna, and amplification by the amplification means. Inputting the response signal,
Detecting means for outputting a detection signal indicating whether or not the response signal has been received, and detecting the detection signal, for a predetermined period from the time of detection,
Notification timer means for outputting a drive timing signal; incoming notification means for receiving the drive timing signal and driving the light emitting element while the drive timing signal is being input; the detection means; and the notification timer means And a secondary battery that supplies power for at least one of the incoming notification means to operate, and a solar cell that receives light to generate an electromotive force and charges the secondary battery with the electromotive force. And a power supply means. 11. A re-reception monitoring means for detecting the detection signal and preventing the notification timer means from outputting the drive timing signal more than once within a predetermined period from the time of the detection. The incoming call detector according to claim 10, characterized in that: 12. At a predetermined timing, it is determined whether or not the power supply means has the ability to supply the power.
The incoming call detector according to claim 10, further comprising a power supply inspection unit that notifies a determination result to the outside.