JPS6010680B2 - alarm - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an alarm device used, for example, as an alarm buzzer with a flash, and the object thereof is to prevent the alarm effect of sound and light from being impaired by the surrounding environment such as changes in illuminance between day and night. In addition, it is an object of the present invention to provide an alarm device which can give a powerful alarm by synchronizing sound and light and can be simplified in configuration.

Conventionally, alarm devices have been known that are constructed by combining a buzzer that generates a sound by driving an electromagnetic vibrating body with an incandescent light bulb driven by a flicker and driven intermittently, but when used as an emergency alarm, a sufficient notification effect can be obtained. It is something that cannot be done.

This means that when a vibration spring plate is excited and vibrated using an electromagnetic device, if one of the spring plates contains harmonic components that increase the alarm effect, the elastic stress will increase and the lifespan will be shortened.
This is due to the fact that electromagnetic vibrators usually generate a low sound, and incandescent light bulbs have low brightness.

Furthermore, with this type of alarm that combines sound and light,
This means that light warnings are not very effective during the daytime, and there is a need to further improve the warning effectiveness in these situations. The present invention has been made in view of these conventional drawbacks.

The alarm device of the present invention will be explained below with reference to the drawings shown as examples. In Fig. 1, 1 is a power source, 2 is a light emitter that emits flash light such as a xenon lamp, and 3 is an inverter and a capacitor for charging and discharging. 4 is an electronic sound generation circuit having an oscillation circuit;
5 is a voice conversion circuit. The respective circuits are connected in parallel to both ends of the power supply 1, and the audio conversion circuit 5 includes transistors 6 and 7.
and an audio converter 8 are connected in series, and a photoconductive element 9 is connected between the base of the transistor 7 and one end of the power source 1. Then, the output voltage of the light emitter drive circuit 3 is connected to a resistor 10,
The signal is input to the electronic sound generating circuit 4 through a voltage dividing circuit consisting of 11, and the output of the electronic sound generating circuit 4 is connected to the base of the transistor 6.

FIG. 2 shows the electronic sound generation circuit 4, in which a modulation input from the light emitter drive circuit 3 is connected to the base circuit of two transistors 12 and 13 as a piperator circuit.

FIG. 3 shows a light emitter drive circuit 3, in which a time constant circuit consisting of a resistor 14 and a capacitor 5, a primary coil of an inverter transformer 16, a base and an emitter of a transistor 17 are connected to a power source 1, and the A secondary coil is connected to the collector and emitter and driven intermittently, and the high voltage current generated in the secondary coil is rectified by a diode 18 to charge a capacitor 19. A resistor 20 and a capacitor are connected across the capacitor 9. 21 are connected in parallel, and the voltage of the capacitor 21 is applied to a trigger coil 23 connected via a trigger lamp 22 to generate a high voltage at the trigger terminal of the light emitter 2.

FIG. 4a shows the change in the terminal voltage of the capacitor 19, the fourth
Figure b shows flash light from the light emitter 2. Therefore, the light emitting body 2 emits light due to the charge of the capacitor 19, and when the voltage drops to a certain level, the discharge is stopped and the state returns to the original state, and the capacitors 9 and 21 are charged. The change in the terminal voltage of the capacitor 19 becomes an input to the electronic sound generating circuit 4, which modulates the electronic sound generating circuit 4 and generates an alarm from the audio converter 8 with an electronic sound having the waveform shown in FIG. 4c. In such an alarm, the light emitter 2 emits flash light by charging and discharging high voltage current by the light emitter drive circuit 3, and the fluctuating voltage caused by charging and discharging the light emitter drive circuit 3 causes the electronic sound generating circuit 4 to oscillate. The circuit is frequency modulated and its output turns on the transistor 6 and drives the audio converter 8.

When there is ambient light at the location where the alarm is installed in the daytime, the photoconductive element 9 has a low resistance, so the transistor 7 is sufficiently conductive to increase the sound volume of the audio converter 8, and in the daytime, the light emitter When the warning effect of the second flash light decreases, this is compensated by the audio converter 8. Next,
At night, the photoconductive element 9 has a high resistance, so the conduction resistance of the transistor 7 increases, and the audio converter 8
Although the volume of the sound decreases, since it is nighttime, the flash light from the light emitter 2 has a large warning effect, which compensates for the decrease in the volume.

5 to 6 show another embodiment between the above-described audio conversion circuit 5 and the photoconductive element 9, in which a voltage detection circuit 24 connected to the power source 1' is provided, and a resistor 25 and the audio converter 8 are connected to each other. The audio conversion circuit 5 is made up of a series circuit of transistors 6, and the audio conversion circuit 5 is provided with a transistor 7 that bypasses the resistor 25, and the voltage detection circuit 24 detects the voltage across the photoconductive element 9 to form the audio conversion circuit. Transistor 6 connected to 5
The voltage detection circuit 24 is a Schmitt circuit consisting of two transistors 26 and a resistor shown in FIG. 6. According to this embodiment, the electronic sound generating circuit 4 also drives the audio converter 8. Then, when the resistance value of the photoconductive element 9 decreases due to daytime ambient light, the voltage detection circuit 24 conducts the base circuit of the transistor 6, increases the drive current flowing through the transistor 6, and raises the sound of the audio converter 8. When the surroundings of the installation location become dark at night, the photoconductive element 9 detects a high resistance, the voltage detection circuit 24 becomes non-conductive, and a small drive current flows through the resistor 25, causing a low-volume alarm to be emitted from the audio converter 8. I will be leaving.

According to this embodiment, the voltage level can be detected in a snap manner. By switching the volume, it is possible to prevent the volume from dropping below a certain level. FIG. 7 shows another embodiment of the present invention, in which a voltage detection circuit 24 for detecting the voltage across the photoconductive element 9 is connected to the base of the switching element 7 of the audio conversion circuit 5, and a timer circuit is connected to the base. A forced switching circuit 28 consisting of a circuit for detecting a moving object such as a person or an object such as a sonic alarm or a light beam alarm is connected thereto.

When a timer circuit is used in the forced switching circuit 28, when a low-volume alarm continues at night, the voltage detection circuit 28
Regardless of the current, the transistor 7 is made sufficiently conductive to allow the drive current to flow without passing through the resistor 25, and the audio converter 8
drive. According to this embodiment, when the alarm is used for crime prevention, human life may be at stake, so the alarm is forcibly switched after about 3 pm, for example, so that the alarm does not continue for a long time at night. It is also possible to add a reset circuit to the timer circuit to cut off alarms that are louder than a certain period of time in the event of false alarms. The forcible switching circuit 28, such as a detection circuit for an ultrasonic warning device or a light warning device, or a timer circuit, can also be connected to a circuit that does not use the resistor 25 in the embodiment of FIG. It is included as an example. As described above, the alarm device of the present invention includes a light emitting body 2 and its drive circuit 3, an electronic sound generation circuit 4 whose frequency is modulated by the output of the drive circuit 3, and an audio conversion circuit 5 driven by the electronic sound generation circuit 4. and the power supply 1
is connected in parallel to both ends of the power source 1, and a photoconductive element 9 exposed to ambient light is connected to the same power source 1 to control the drive current of the audio conversion circuit 5.When there is ambient light, It is possible to obtain a large-volume alarm sound that compensates for the alarm caused by the flash light of the light emitter 2, and it is also possible to obtain a low-volume alarm sound when the illuminance of the ambient light decreases, and it is possible to obtain a low-volume alarm sound that compensates for the alarm caused by the flash light of the light emitter 2. When the function deteriorates, the alarm effect itself decreases, and even though the night flash light has sufficient alarm function, there is no longer a loud alarm sound, and the sound and light are harmonized, resulting in a good alarm effect. Moreover, since the sound conversion circuit 5 is driven by the electronic sound generation circuit 4 whose frequency is modulated by the output of the light emitter drive circuit 3, an oscillation circuit for the modulation signal is not required, and the structure of the alarm can be simplified. It can be manufactured at a low cost with less materials required, and a flash light can be emitted at a certain frequency or when a sound of a certain intensity is heard, and the synchronization of this light and sound can further increase the alarm effect. The light emitter 2 and its drive circuit 3, an electronic sound generation circuit 4 whose frequency is modulated by the output of the drive circuit 3, and an audio conversion circuit 5 driven by the electronic sound generation circuit 4 are connected in parallel to both ends of the power supply 1. A forced switching circuit 28 that outputs a time-limited output or a detection output of a moving object is connected to the same power source 1 together with the photoconductive element 9 that is atomized into ambient light, and the forced switching circuit 28 is connected to the power source 1 to give priority to the circuit of the photoconductive element 1. By configuring the circuit 28 to control the driving current of the sound conversion circuit 5, when the time limit of the forced switching circuit 28 expires or when a moving object approaches, the photoconductive element 1 reduces the sound volume to a low level. This alarm device is suitable for cases where human life is at stake because it can automatically switch the sound conversion circuit 5 in the alarm to produce the same alarm sound as before, further increasing the alarm effect and creating a tense situation. is obtained.

[Brief explanation of the drawing]

The figures show an embodiment of the alarm device of the present invention, Fig. 1 is an electric circuit diagram of one embodiment, Fig. 2 is an electric circuit diagram showing an embodiment of an electronic sound generating circuit, and Fig. 3 is a light emitting element drive circuit. An electric circuit diagram showing one embodiment of the present invention, FIG. 4 is a diagram showing the characteristics of a light emitter drive circuit and an audio converter, FIG. 5 is an electric circuit diagram showing another embodiment of the present invention, and FIG. An electric circuit diagram showing one embodiment of the detection circuit is shown in FIG. 0, and FIG. 7 is an electric circuit diagram showing another embodiment of the present invention. 1...Power supply, 2...Light emitter, 3...
...Light emitter drive circuit, 4...Electronic sound generation circuit, 5...Audio conversion circuit, 6, 7...Transistor, 8...Audio converter, 9... Photoconductive element, 10, 11... Resistor, 12, 13...
...Transistor, 14...Resistor, 15"
""Capacitor, 16"""Inverter transformer, 17
...Transistor, 18...Diode, 19...
...Capacitor, 20...Resistor, 21...
... Capacitor 0 capacitor, 22 ... Trigger lamp, 23 ... Trigger coil, 24 ... Voltage detection circuit, 25 ...
...Resistor, 26,27...Transistor,
28...Forced switching circuit. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Scope of Claims] 1. A light emitter and its drive circuit, an electronic sound generation circuit whose frequency is modulated by the output of the drive circuit, and an audio conversion circuit that drives the electronic sound generation circuit are connected in parallel to both ends of a power supply. and a photoconductive element exposed in ambient light is connected to the same power source to control the drive current of the audio conversion circuit. 2. The alarm according to claim 1, wherein the photoconductive element is provided with a voltage detection circuit that detects the voltage across the photoconductive element, and the voltage detection circuit controls a transistor to control the drive current of the audio conversion circuit. vessel. 3 A series circuit consisting of a resistor, an audio converter, and a transistor driven by a signal from an electronic sound generation circuit is connected to both ends of the power supply, and the resistor is connected to the side of the transistor driven by the voltage detection circuit connected to the photoconductive element. 2. The alarm device according to claim 1, wherein the alarm device is a voice conversion circuit configured to transmit a signal. 4. A transistor is connected through a time constant circuit to the primary coil of an inverter transformer connected to a DC power source, and the transistor cuts off the secondary coil to generate high voltage, rectifying and smoothing the high voltage current. A light emitter drive circuit is connected to both electrodes of a xenon lamp that serves as a light emitter, and a high voltage is applied to the trigger terminal of the xenon lamp via a trigger circuit including a time constant circuit. 2. The alarm device according to claim 1, further comprising a light emitter driving circuit which divides the voltage and inputs the voltage to an electronic sound generating circuit. 5 A light emitter and its drive circuit, an electronic sound generation circuit whose frequency is modulated by the output of the drive circuit, and an audio conversion circuit driven by the electronic sound generation circuit are connected in parallel to both ends of a power supply, and ambient light is connected to the same power supply. A forced switching circuit that outputs a time-limited output or a moving object detection output is connected to the photoconductive element exposed in the photoconductive element, and the forced switching circuit is configured to control the drive power of the audio conversion circuit with priority over the photoconductive element circuit. An alarm device characterized by: