JPH0626324B2 - Radio selective calling receiver having light emitting element blinking circuit - Google Patents

Abstract

PURPOSE:To halve number of coils for boosting to number of LEDs and to save number of the coils by using one coil in common to two LED boosting means. CONSTITUTION:An LED blink signal is fed respectively from ports P2-A and P2-B of a control section to a base of transistors(TRs) 35, 34 of an LED circuit. For example, in case of blinking the LED 32 only, current flows to the TR 35 by a signal from the port P2-A to make the voltage at a point P nearly equal to the voltage at a power supply 31. If a signal comes further from the port P2-B in this state, a current flows to the TR 34 and the energy is stored in a boosting coil 40. No current flows to the TR 34, only the LED 32 only is lighted by a counter electromotive force generated in this case, and the waveform is repeated and only the LED 32 is blinked. Thus, number of boosting coils is saved.

Description

Description: TECHNICAL FIELD The present invention relates to a small receiver having a light emitting element blinking circuit, and more particularly to a light emitting element blinking circuit having a plurality of light emitting elements and used in a radio selective call receiver. And a radio selective call receiver having

[Conventional technology]

In recent years, some radio selective call receivers have a plurality of selective call numbers, and some have a plurality of reception frequency settings that can be used in various places. In accordance with this, there are various means for notifying the carrier of the call receiver and means for confirming the set reception frequency. For example, there is a reading / notifying means for changing the sound of the speaker or blinking the light emitting elements of different colors corresponding to different selective call numbers. Further, there is a set frequency confirmation means which is indicated by blinking of a light emitting element of a different color when the carrier changes the frequency setting depending on the destination.

By the way, as a light emitting element used in the above-mentioned read-out notification means and set frequency confirmation means, an LED (light-enthing) is usually used.
diode) is used. 2V to turn on the LED
Although a voltage of a certain degree is required, since the paging receiver is generally used while being carried, a 1V type battery which can be easily converted is used as a power source. Therefore, the paging receiver requires a light-emitting element lighting circuit that blinks the LED by boosting the voltage of the 1V system battery.

This type of light-emitting element blinking circuit has been conventionally used
No. 39156). This is a technology in which energy is stored in a coil connected in parallel to an LED by a 1V system battery, and the LED is lit by a counter electromotive force generated when the energy is released, thereby causing the LED to blink. is there.

FIG. 6 is a circuit diagram showing the above-described conventional light emitting element blinking circuit. FIG. 7 is a time chart of signals transmitted from the control unit of the light emitting element blinking circuit of FIG.

In FIG. 6, reference numeral 51 denotes a 1V system battery which is a power source of the light emitting element blinking circuit. 52 is an LED, 53 is an LED 52
And 54 and 55 are resistors for determining the bias of the transistor 53, and 56 are drivers for driving the
Is a coil for boosting a 1V power supply. In addition,
For the sake of convenience, the circuit including the LED 52 to the coil 56 is referred to as an LED circuit 59. 57 is a control unit,
Reference numeral 58 is a clock generator, and the control unit 57 operates by obtaining a timing signal by the clock generator 58.

In the above configuration, the control unit 57 divides the output signal of the clock generator 58 to generate a pulse signal having a frequency of 1 / t ₀ (Hz) as shown in FIG. 7 and outputs it to the LED circuit 59. First, in the state at time t ₁ in FIG. 7, current flows through the transistor 53 and energy is stored in the coil 56. At this time, the LED circuit 52 is not lit. next,
In the state at time t _{2 in} the figure, current does not flow in the transistor 53, and the LED 52 is turned on by the counter electromotive voltage generated by the coil 56 at that time.

Hereinafter, by repeating this periodically, the blinking operation of the LED continues.

[Problems to be Solved by the Invention]

In order to obtain LEDs of different colors, that is, a light emitting element blinking circuit including a plurality of LEDs by using the conventional light emitting element blinking circuit described above, the above-described conventional circuits are required by the number corresponding to the number of LEDs. Therefore, simply replace the conventional circuit with an LED.
If the light emitting element blinking circuit, which is used in the same number as the above number, is used in the radio selective calling receiver, the number of circuit components increases, and in particular, a boosting coil is required for the number of LEDs, which is a great obstacle to downsizing of the device. In particular, in order to obtain the inductance required for boosting, the outer shape of the coil becomes considerably large, and increasing the number of coils in response to the increase in the number of LEDs is the biggest obstacle to miniaturization.

An object of the present invention is to reduce the number of boosting coils in a radio selective calling receiver having a plurality of light emitting elements and having a light emitting element blinking circuit for reading out notification and setting frequency confirmation of an individual selective calling receiver. And

[Means for Solving the Problems]

According to the present invention, the DC power supply means, the coil element, and the first terminal are connected to the DC power supply means in the opposite direction to the voltage applied by the DC power supply means, and the second terminal is the coil element. A first light-emitting element connected to one end, and a second light-emitting element in which a third terminal is connected to the other end of the coil and the fourth terminal is grounded in the same direction as the first light-emitting element. A light emitting element series circuit including an element, a first switching means interposed between the first terminal and ground, a second switching means interposed between the third terminal and a power supply, and a radio signal To generate a reception signal, wireless signal receiving means, storage means for storing first and second selective calling numbers, first and second selective calling numbers, and a receiving selective calling number included in the reception signal. And if the received selective call number and the first selective call number Detecting means for generating a first detection signal if the received selective calling number and the second selective calling number match, and a first detecting means for generating a second detection signal. The first switching means is continuously turned on in response to the signal, the second switching means is repeatedly turned on / off, and the second switching means is continuously turned on in response to the second detection signal. A radio selective calling receiver having a light emitting element blinking circuit, characterized in that it includes control means for repeatedly turning on and off the first switching means.

〔Example〕

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

FIG. 1 is a block diagram showing a radio selective calling receiver having a light emitting element blinking circuit of the present invention, and FIG. 2 is a flow chart showing the operation of the control unit in FIG. In FIGS. 1 and 2, after the power is turned on (step 21), the radio signal received by the antenna 1 is amplified and demodulated by the receiving unit 2. The demodulated signal is converted by the waveform shaping circuit 3 into a waveform that can be processed by the control unit 4. Control unit 4
When the switch 11 connected to the switch is in the calling mode (step 22), the control unit 4 uses the output from the clock generator 10 as a timing signal and outputs the P-ROM (Programmable-R).
An own calling number written in advance in the ead only memory 5 is compared with a signal from the circuit 3. This P
-In the ROM, for example, Call that corresponds to each caller
It is assumed that two types of call numbers, Bcall and Bcall, have been written. If the signal from the circuit 3 does not match any of the above two types of calling numbers (step 23), the process returns to step 22. If the signal from the circuit 3 coincides with one of the above two types of calling numbers (step 23), and the speaker switch 12 is turned on (step 2).
4), the control unit 4 controls the port P1 to the speaker driver 7
A speaker drive signal is sent to (step 25). The speaker 8 sounds in response to this drive signal. Further, the control unit 4 outputs the LED blinking signal synchronized with the speaker control signal from the ports P2-A and P2-B (step 2).
6). LED circuit 9 supplied with this LED blinking signal
In this example, is composed of two LEDs and a drive circuit thereof, and makes one of the two LEDs blink in response to the above-mentioned LED blinking signal. The two LEDs have different colors for easier distinction. When the speaker switch is off in step 24, the control unit 4 outputs only the LED blinking signal from the ports P2-A and P2-B. Then, only the LED circuit 9 blinks.

The waveforms of the speaker drive signal and the LED blinking signal output from the ports P1 and P2-A, P2-B are changed according to A-call or B-call. By changing the waveform, the sounding frequency of the speaker is changed, or only one of the two LEDs is made to blink so that A-call or B-call can be distinguished.

When the switch 11 is not in the calling mode, that is, in the frequency confirmation mode (step 22), the control unit 4 outputs the frequency confirmation signal corresponding to the set reception frequency from the ports P2-A and P2-B. (Step 26). Further, in this mode, the control section 4 sends the reception frequency signal set by the switch 13 to the reception section 2 (step 28). In response to this, the receiver 2 sets the reception frequency. For example, when there are two types of settable reception frequencies, the above-mentioned A-call,
By sending the same waveform as the LED blinking signal of the type corresponding to B-call to the LED circuit 9 for each set frequency, the set frequency can be confirmed.

It should be noted that although a power supply circuit for each part is omitted in FIG. 1, it is premised that a predetermined power is supplied to each part by a 1V system battery.

Next, the LED circuit of FIG. 1 and its operation will be described in detail with reference to FIGS.

FIG. 3 is a circuit diagram showing the LED circuit of FIG. 1, FIGS. 4A and 4B are time charts of signals sent from the control unit of FIG. 1 to the LED circuit, and FIGS. 5A and 5B are third diagrams. It is an equivalent circuit diagram at the time of each LED lighting of the LED circuit of the figure.

In FIG. 3, 31 is a 1V power supply, 32 and 33 are LEDs of different colors, 34 and 35 are transistors, and have both the functions of switching and driving of the LEDs 32 and 33. Therefore, it has a high current amplification function. At the bases of the transistors 35 and 34, the port P2- of the control unit 4 (Fig. 1) is provided.
LED blinking signals are supplied from A and P2-B, respectively. Reference numerals 36 to 39 are resistors that determine the bias of the transistors 34 and 35. Reference numeral 40 is a boosting coil of the power source for the LEDs 32 and 33.

In this configuration, when only the LED 2 is blinked, that is, the switch 11 (FIG. 1) is in the calling mode, for example, when the LED 2 is blinked in correspondence with A-call, or the switch 11 is in the frequency confirmation mode, two types are selected. Of the settable frequencies ₁ and ₂ , when the LED 2 is made to blink according to the setting of frequency ₁ , the signals as shown in FIG. 4A are output from the ports P2-A and P2-B. That is, the LED blinking signal from the port P2-A is changed from high to low, and a current is passed through the transistor 35,
The voltage at the point P shown in FIG. 3 is made substantially equal to the voltage of the power supply 31. FIG. 5A is a circuit diagram of an equivalent circuit in this state. In this state, when the signal shown in FIG. 4B is further transmitted from the port P2-B, current flows through the transistor 34 at the time t _1a and energy is stored in the coil 40. Then, at the time t _2a , no current flows through the transistor 34, and only the LED 32 is turned on by the counter electromotive force generated at that time. When the waveforms of the times t _1a and t _2a are repeated, only the LED 32 blinks. On the other hand, since no current flows through the LED 33, it does not light up or blink.

In addition, when only LE33 blinks, that is, switch 1
1 (FIG. 1) is a calling mode, for example, B-call
When the LED 33 blinks in accordance with the above, or the switch 11 is in the frequency confirmation mode, the frequency L is set in correspondence with the frequency ₂ setting of the two kinds of settable frequencies ₁ and _2.
When blinking the ED 33, a signal as shown in FIG. 4B is output from the ports P2-A and P2-B. That is, the signal at the port P2-B is changed from low to high, a current is caused to flow through the transistor 34, and the point Q shown in FIG. 3 is brought to almost the ground potential. FIG. 5B is a circuit diagram of an equivalent circuit in this state. Also in this case, only the LED 33 blinks on exactly the same principle as the LED 32 blinks. On the other hand, since no current flows through the LED 32, it does not light up or blink.

Also, as shown in FIGS. 4A and 4B, a signal for blinking the LED is sent after the switching of the transistor is completely performed. That is, a slight time difference t _m is provided. The present invention is not limited to the above-mentioned embodiments, but includes various modifications within the scope of the gist. For example, in the above-described embodiment, the control unit uses the LED
The duty of the pulse signal sent to blink is about 50%, but by changing the duty to make the lighting continuous or intermittent, more types of call notifications and settings can be made. The frequency can be confirmed.

Further, the LED circuit described in detail in the present invention can be applied not only to the radio selective calling receiver but also to the resin notification means of a small receiver operated by a DC power source.

〔The invention's effect〕

As described above, according to the present invention, one coil also serves as a boosting means for two LEDs, so that the boosting coil has a light emitting element blinking circuit having a light emitting element blinking circuit which is half the number of LEDs. The effect of being able to provide a receiver and a small receiver.

In particular, in recent years, a switching circuit configured with a single transistor package or a plurality of LEDs
However, the coil has a mechanical structure, so there is no possibility of sudden miniaturization. That is, the effect of reducing the number of coils according to the present invention is particularly effective in terms of downsizing a small receiver.

[Brief description of drawings]

FIG. 1 is a block diagram showing a radio selective calling receiver having a light emitting element blinking circuit of the present invention, FIG. 2 is a flow chart showing the operation of the control unit of FIG. 1, and FIG. 3 is an LE of FIG.
A circuit diagram showing the D circuit, FIGS. 4A and 4B are time charts of signals sent from the control unit of FIG. 1 to the LED circuit, and FIGS. 5A and 5B are each of the LED circuits of FIG. L
An equivalent circuit diagram when the ED is turned on, FIG. 6 is a circuit diagram showing a conventional light emitting element blinking circuit, and FIG. 7 is a time chart of signals sent from the control unit of the light emitting element blinking circuit of FIG. . 1 ... antenna, 2 ... reception part, 3 ... waveform shaping circuit,
4 ... control unit, 5 ... P-ROM, 7 ... speaker driver, 8 ... speaker, 9, 59 ... LED circuit, 1
0 ... Clock generator, 11, 12, 13 ... Switch, 31 ... 1V power supply.

Claims (1)

[Claims] 1. A direct current power supply means, a coil element, and a first terminal connected to said direct current power supply means so as to be in a direction opposite to a voltage applied by said direct current power supply means.
A first light emitting element whose terminal is connected to one end of the coil element, and a third terminal connected to the other end of the coil so that it is in the same direction as the first light emitting element, and a fourth terminal is A light emitting element series circuit including a grounded second light emitting element, first switching means interposed between the second terminal and ground, and interposed between the third terminal and a power supply. Second switching means, wireless signal reception means for generating received signals, storage means for storing first and second selective call numbers, and first and second selective call numbers The reception selective call number included in the received signal is compared, and if the reception selective call number and the first selective call number match, the first
Detecting means for generating a second detection signal if the received selective call number and the second selective call number match, and in response to the first detection signal. The first switching means is continuously turned on, the second switching means is repeatedly turned on / off, and the second switching means is continuously turned on in response to the second detection signal. A radio selective calling receiver having a light emitting element blinking circuit, comprising: a control means for repeatedly turning on and off the first switching means.