JPS60227530A - Information transmitting device - Google Patents

Abstract

PURPOSE:To eliminate the malfunction of an information transmitting device and to improve the reliability of the device, by leading out a signal from a synchronizing signal synchronizing with a power source for a lighting device when infrared noises are less and radiating infrared rays only when the signal exists. CONSTITUTION:An output of the information sensor 3 of an information transmitting device is detected by means of the signal generating circuit 41 of a transmission circuit 4 and a signal is supplied to a power supply circuit 17, and then, a voltage is applied across the circuit 4, synchronizing signal generating circuit 15, and control circuit 16 from a power source 6. If a lighting device 13 lights when the voltage is applied, infrared rays are received by means of the photoreceptor element 151 of the circuit 15 together with visible light and high- frequency components of the light are removed by a filter 153. Then a signal synchronizing with the phase of the device 13 having less infrared noises is outputted from a comparator circuit 154. The synchronizing signal of the circuit 15 is supplied to the circuit 4 through the control circuit 16 and information of the sensor 3 is modulated at a modulator circuit 42, and then, infrared rays are radiated from a light emitting element 5. Thus malfunctions of the information transmitting device are eliminated and reliability of the device is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to improving the reliability of an information transmission device that transmits information using infrared rays.

[Prior art]

Figure 1 is a circuit diagram showing a conventional information transmission device. In Figure 9, (1) is a transmitter, (2) is a receiver that receives a signal from this transmitter, and (3) is a circuit diagram that detects transmitted information. (4) is a transmitting circuit that receives the output of this information sensor and generates a drive signal for an infrared light emitting element (5) such as an infrared light emitting diode; (6) is this transmitting circuit; The power source (7) that energizes the light emitting element (5
) receives infrared rays emitted into space.

A light-receiving element such as a photodiode converts this into an electrical signal, (8) an amplifier circuit that amplifies the output signal of this light-receiving element, (9) a filter, and [101] a detection circuit.

riυ is a processing circuit that determines the information content from the transmitter (1).

0? is a display device that displays or gives an alarm depending on the information content determined by this processing circuit. 0 is an illumination device, such as a fluorescent lamp, provided in the infrared ray transmission space, and a4 is an AC power source that energizes this illumination device.

Next, the operation shown in FIG. 1 will be explained. For example, when a fire or the like occurs and the information sensor (3) detects this.

The transmitter circuit (4) starts oscillating due to the output of the information sensor (3), and sends out a drive signal having a waveform as shown in FIG. 2(A). The waveform of this drive signal represents the location where the abnormality has occurred, that is, the location where the information center (3) is installed and the inner valley of the information. This drive signal causes the light emitting element (5) to
is driven, and the 9th light emitting element (5) receives the same second drive signal as the above drive signal.
Infrared rays having the waveform shown in Figure (A) are continuously and repeatedly emitted. At this time, time t1. Oscillation at t2 is 1 usually 40
It is designed to blink at a high frequency of about KH2. This is to avoid noise in the infrared transmission space as much as possible. Now, the infrared rays emitted from one light emitting element (5) are received by the light receiving element (7) of the receiver (2) and converted into an electrical signal. The electrical signal from this light receiving element (71) is amplified by an amplifier circuit (8) and then supplied to a filter (9).

Filter (9) removes noise in the transmission space.

Only the signal from the transmitter (1) shown in Fig. 2 (A) is separated and derived and applied to the detection circuit (II).In the detection circuit αO, the received signal shown in Fig. 2 (A) from the filter (9) is of,
It is converted into a digital signal as shown in FIG. 2(B).

The processing circuit 011 receives this digital signal and determines the high level time t1. 1.0, 0.1 by t2
The location and content of the abnormality are determined based on the determination result, and this is displayed on the display device a? to be displayed.

Now, with the above operation, it is possible to perform accurate information transmission in normal cases, but when lighting device 0 is lit, accurate information transmission cannot be performed. This is because the infrared rays synchronized with the gradient of the AC power supply shown in FIG.
For example, the infrared rays emitted by a fluorescent lamp contain a large amount of harmonics near the signal station mantissa 4° KHz, which is why the amplifier circuit (8) of the receiver (2) is particularly sensitive to the amount of infrared rays emitted. When there is a lot of electricity*, it becomes easy to saturate near the peak value of the voltage,
If the amplifier circuit (8) becomes saturated, only a portion of the signal from the transmitter (1) will be transmitted, making it impossible to obtain sufficient reliability, and the receiver (2) will not receive any transmitted signals. (or it will malfunction again.

In particular, when the receiver (2) is installed near lighting device 0, or when the amount of light from lighting device a is large, the influence is large, so the mounting position of receiver (2) and lighting device α3 may be changed. It also means that you cannot choose freely.

[Summary of the invention]

This invention has been made to eliminate the drawbacks of the conventional device as described above, and it can provide illumination by receiving light generated by a lighting device installed in an infrared transmission space between a transmitter and a receiver. By deriving a signal synchronized with the power supply for the device, and further deriving a signal synchronized from this synchronization signal to a point in time when there is little infrared noise from the lighting device, and emitting infrared rays only when this signal is present, reliability is achieved without malfunction. [Embodiment of the Invention] FIG. 4 is a circuit diagram showing an embodiment of the invention, and is the same as or equivalent to the conventional device shown in FIG. Since the parts are given the same reference numerals, the explanation will be omitted.

(4) is a transmission circuit, which includes a signal generation circuit that outputs the detection information of (3) in synchronization with a synchronization signal from a control circuit ae to be described later, and a signal generation circuit that outputs the detection information of (3) at a predetermined frequency, for example, 4. Modulation circuit 1421 that modulates g x Hz
and a drive circuit uy that drives nine light emitting elements (5). a9 is a synchronization signal generation circuit, which includes a light receiving element (1
5, an amplifier circuit (
152), a filter (153) that removes harmonics from the received light signal and derives only the frequency component of the AC power source a4 that energizes the lighting device α, and a filter that compares the received signal with a predetermined signal (described later) A comparison circuit (consisting of 15 circuits) that derives a synchronization signal synchronized with α4. 061 is a control circuit that operates the upper gr2 signal generation circuit l according to the synchronization signal from the synchronization number generation circuit MQ5, and 071 is Only when the information sensor (3) is activated.

This is a power supply circuit for operating the synchronization signal generation circuit a9 and the control circuit aS.

In Fig. 4, when the information sensor (3) detects a fire, the output of this information sensor (3) is transferred to the signal generation circuit (
411 detects it and applies a signal to the power supply circuit 0η, and applies the voltage of the % source (6) to the modulation circuit (42), drive circuit (43, synchronization signal generation circuit (L4) and control circuit (161) that are in a dormant state). voltage to enable these valley circuits.

At this time, when the illumination device 11J is lit, the infrared rays generated together with visible light are received by the light receiving element (151) and converted into electrical signals, which are amplified by the amplifier circuit (152) and then passed through the filter (153). The harmonic components are removed by 1
Only signals generated in synchronization with the power supply I, such as KR shown in FIG. 5(A), are output. The comparison circuit (154) is 1, for example, about 7 points of the peak 1 of the output IR of the filter (15!+).
The voltage is generated as a reference value as l1tQ in FIG. As shown in B), the illumination device 03 generates a ready signal with little infrared noise, that is, a signal synchronized with the phase of the power source Q41 near 00. If the reference value BQ is changed in proportion to the peak value of the signal KH, the time t of the synchronization signal
3 is always constant. The synchronizing signal shown in FIG. 5(B) generated by this comparison circuit (154) is applied to the control circuit a9, which applies the output signal of the signal generation circuit +411 to the modulation circuit C2 for the time t3. Modulation circuit (at 42).

Within the time t3, the information sensor (3
) is modulated and output, and infrared rays are emitted by the light emitting element (5) via the drive circuit (43).

Time t1. During t2, the frequency is about 40 Kh. - The power receiver (2) receives the infrared rays emitted by the nine light-emitting elements (5) in the same manner as the receiver (2) of the conventional device shown in Fig. 1, and the result determined by the processing circuit aυ is displayed on the Display on α?

FIG. 6 is a circuit diagram showing another embodiment of the present invention, which is a pseudo synchronous signal generating circuit used when the lighting device (13) is not installed or when the lighting device '113 is turned off. The control circuit aS is provided with a pseudo synchronization signal oscillation circuit (161) and a selection circuit (162) that generate 151 XJJ numbers as shown in FIG. If the output of the comparator circuit (153) is less than a certain value or the output of the comparator circuit (154) does not change even after a certain period of time, the synchronization signal generation circuit 4 determines that it cannot generate a synchronization signal, and switches on the changeover switch (153).
65) is switched from contact (164) to contact (165), and the output of the pseudo synchronization signal oscillation circuit (161) is applied as a synchronization signal to the transmission circuit (4).

Figure 1 shows the transmitter (I), information sensor (3), and lighting device Q.
3 is a diagram showing an example of the arrangement of the present invention such as information sensor (
3) is installed on the ceiling, and the transmitter (II) is placed close to it. The receiver (2) is installed on the wall. By the way, in this example, the light receiving element (151) is a flexible pipe, etc. 61 is attached to the tip of the flexible holder (155), so it is possible to freely set the direction of light reception, and by pointing it straight toward illumination device a, a large light reception signal can be obtained. By narrowing the light receiving angle of the light receiving element (151), the amount of light received by sources other than the lighting device (13) can be reduced, making it possible to generate accurate synchronizing signals. .

By the way, in the above embodiment, the light receiving element (151) is provided with a visible light cut filter to detect only infrared rays, but it can operate in the same way even if it receives visible light. Light receiving element (i si)
Since the incident light becomes stronger, the sensitivity of the receiver (2) should be lowered (
By doing so, it becomes Noh. Although not mentioned above, 9 light emitting elements (
5) and the directional characteristics of the light receiving element (71).

Of course, it is desirable that the transmitter (1) and the receiver (2) be as wide as possible in order to have flexibility in their arrangement. 151 is brought into operation only when the information sensor (3) is activated to suppress consumption of the power source (6).

If the power supply (6) has sufficient capacity, the power supply circuit Q1 may be omitted.

In the above description, a fire alarm was exemplified as the information sensor (3), but other disaster prevention sensors may also be used.

Further, the present invention is not limited to disaster prevention use, and may also be used for pushbutton switches or other devices directly operated by humans; in short, the present invention can be applied to the transmission of all kinds of information.

〔Effect of the invention〕

As described above, according to the present invention, it is provided in the infrared transmission space. Detects the light generated by the lighting device, derives a signal synchronized with the AC power source that energizes the lighting device from the received light signal, and transmits it from the transmitter in synchronization with this synchronization signal near 0° phase of the AC power source. Since it is sending,
The infrared noise generated by the lighting device is small (therefore, saturation of the amplifier circuit of the receiver can be prevented, and accurate information transmission without malfunction can be performed).

[Brief explanation of drawings]

Figure 1 is a circuit diagram showing a conventional device, Figure 2, Figure 3 is a circuit diagram showing a conventional device, and Figure 2 is a circuit diagram showing a conventional device.
FIG. 4 is a circuit diagram showing an embodiment of the present invention. FIG. 5 is a waveform diagram explaining the operation of FIG. 4. FIG. Figure 1 is a diagram showing an example of the arrangement of the present invention. In Figure 1, (l) is a transmitter, (2) is a receiver, (3) is an information sensor, and (4) is a diagram showing another embodiment. ) is a transmitting circuit, (4D is its signal generation circuit, (51 is a light emitting element, (6) is a power supply, (7) is a light receiving element, al) is a processing circuit, (13 is a display device, (I3 is a lighting device) , α4 is an AC power supply, q9 is a synchronization signal generation circuit,
The main element is the control circuit. Note that the same reference numerals in the valley diagrams indicate the same or corresponding parts. Agent Masuo Oiwa (and 2 others) Figure 1 Figure 2 Figure 3 Figure 5 VA ji6 Figure 7 Figure 1, Indication of the case Patent Application No. 59-084416 2,
Title of the invention Information transmission device 3, Relationship with the person making the amendment Hitoshi Katayama, representative of the patent applicant, Department 4, Agent 5, Subject of the amendment 6, Contents of the amendment (1) The scope of claims in the specification Correct as shown in the attached sheet. (2) On page 12, line 5 of the specification, r (16) is a control circuit. ", r(16) is the control circuit, (1-6
1) is a pseudo synchronous signal oscillation circuit, and (162) is a selection circuit. ” he corrected. Above 2, Claims (1) A transmitter that converts the information content into infrared rays and transmits it when information path is detected, and displays the information content after receiving the infrared rays from this transmitter and converting it into an electrical signal. a receiver that receives light from a lighting device installed in the infrared transmission space, and a synchronization signal generation circuit that outputs a synchronized signal when the light is below a predetermined value; An information transmission device characterized in that the transmitter is controlled by the output of a circuit. (2) The information transmission device according to claim 1, wherein the synchronization signal generating circuit selectively receives only infrared rays generated by a lighting device. (3) The information transmission device according to claim 1, wherein the synchronization signal generation circuit is operated only when information is detected. (4) The bark alarm transmission device as set forth in claim 1, wherein the direction in which the synchronization signal generation circuit receives light from the lighting device is made variable.

Claims (1)

[Claims] +11 When detecting information, a transmitter that converts the information content into infrared rays and transmits the same; a receiver that receives the infrared rays from this transmitter, converts it into an electrical signal, and then displays the customer information. , a synchronization signal generation circuit that receives light from a lighting device installed in the infrared transmission space and outputs a synchronization signal when the light is below a predetermined value, and an output of the synchronization signal generation circuit. An information transmission device characterized in that the transmitter is controlled by: (2) The information transmission device according to claim 1, wherein the synchronization signal generation circuit selectively receives only infrared rays generated by a lighting device. (3) The information transmission device according to claim 1, wherein the synchronization signal generation circuit is operated only when information is detected. (4) The information transmission device according to claim 1, wherein the direction in which the synchronization signal generation circuit receives light from the lighting device is made variable.