JPS5825727A - Transmitting device for preventing disaster at sea - Google Patents

Abstract

PURPOSE:To generate a submergence signal even when a voltage lack is generated, by providing a power supply part, a signal generating part, a submergence detecting part, a switch part, a specific controlling means, and a specific signal switching means. CONSTITUTION:If the voltage of a battery 9 is lowered in the holding state where a transmitting device is in air, the circuit between a terminal (f) and an earth terminal (e) of a piezoelectric sensor 13 is short-circuited, and a transistor TR 12 is made conductive, and power is supplied to a transmitting part 10, and an NAND gate 15 or the like which generates a low frequency f2 is made unoperated. Consequently, only a low frequency f1 from an oscillating circuit 2 is supplied to a modulator 4, and it is reported to the receiving side that the voltage of the power source is lowered. In this state, when the transmitter is submerged, a submergence detecting part 3 is short-circuited, and output terminals (r) and (u) of NAND gates 16 and 17 become the earth potential and a positive potential, respectively, and the TR 12 is made conductive, and the low-frequency signal of the frequency f2 due to NAND gates 15 and 18 and etc. is supplied to the modulator 4 together with said low-frequency signal f1, and the occurrence of abnormality is reported by the double modulation sound.

Description

[Detailed Description of the Invention] The present invention relates to a transmitting device for marine accident prevention that generates a signal when a crew member or a passenger of a ship or the like falls into water or seawater, and can operate normally at any time. The purpose is to provide a transmitting device for preventing marine accidents.

It has been considered to use dry batteries as a power source for this type of marine accident prevention transmitter, but even in standby mode, a small amount of current flows from the dry batteries, so if the voltage of the dry batteries drops below a certain value, the batteries must be removed. I need to replace it.

Therefore, it is convenient to generate an undervoltage signal when the voltage of the dry cell battery falls below a certain value. However, if the device falls into water while an undervoltage signal is being generated, there is a drawback that the water landing signal will not be generated.

Therefore, the present invention takes the above-mentioned points into consideration and attempts to provide a transmitting device for marine accident prevention that can always generate a water landing signal when falling into water. will be explained with reference to the drawings.

As shown in the figure, in the event of an accidental fall from a ship or the like into seawater, the water landing detection unit 3 detects the fall, and upon detection, the switch closes and the power supply unit 4 is connected to the main body 1o. Power is supplied to. V and X are the power terminals of the main body.

If power is supplied, low frequency circuit 2 and) iA1116
．． 18, the low frequency signals f1 and f2 are generated, the modulation circuit 4 performs low frequency modulation, the high frequency generation circuit 1 generates the high frequency signals, and the FM modulation circuit 5 performs FM modulation. A two-stage amplification circuit 6. After the landing, Puntena 8 will send a water landing signal, which is a 91M modulated electromagnetic wave.

Next, a specific circuit for supplying power will be explained. 11 is a constant voltage circuit, and the ground terminal a is NPN)
It is connected to the collector of transistor 12. Reference numeral 13 denotes a voltage sensor, which functions to short-circuit the terminal r to the earth and -ground terminals e when the voltage of the electric power at the input terminal d becomes lower than the fixed voltage. Further, the set voltage is set by a variable resistor 14. 15
t 16+17.18 is a WAND gate. 3 is the above-mentioned water landing detection section, which is short-circuited by water when it lands on water. In the standby state, the water landing detection unit 3
Since it is open, the input terminal P of the HAND gate 16 is at ground potential, and a positive voltage is applied to the input terminal q via the output terminal of the constant voltage circuit 11, the resistor 19, and the light emitting diode 20. At this time, the output terminal r of the Hm ND gate 16 becomes a positive voltage.

The input terminal S of the HAND gate 170 is connected to the terminal f of the voltage sensor 13 via the diode 21. When the voltage of the battery 9 is higher than the set value, the terminal f and the ground terminal e of the voltage sensor 13 are open, so the HAND gate 1
The input terminal S of the ND gate 17 is at a positive potential, and the input terminal t of the ND gate 17 is at a positive potential, and the output terminal U of the ND gate 17 is at a ground potential. At this time, the NPN transistor 12 is in a non-conductive state because no base current flows, and no power is supplied to the main body. Also, NAND gate 1511
8, resistors 22, 23, and capacitor 24 is a circuit that oscillates at a frequency f2 lower than the frequency f1 oscillated by the low frequency f1 oscillation circuit 2. Since the input terminal 0 of the ND gate 18 is connected to Kusuko U which is at ground potential through a resistor 26, the output terminal 1 is at a positive potential. This is connected to the input terminal k of the NANI) gate 15. Since the input terminal 1 is connected to the input terminal S of the NARD gate 17, it has a positive potential. At this time, since the potential of the output terminal j of the NARD gate 16 is the ground potential, the low frequency f2 oscillation circuit also does not oscillate.

Next, when the transmitting device lands on water, the water landing detection section 3 is short-circuited, a positive potential is applied to the input terminals p and q of the iAND gate 16, and the potential of the output terminal r becomes the ground potential. The input terminal t of HAND gate 17 is HAND gate 1
Since it is connected to the output terminal r of No. 6, it has a ground potential, and a positive potential appears at the output terminal U. Therefore, NPN
) The transistor 12 becomes conductive, and power is supplied to the transmitter. The diode 26 is a circuit for continuing the transmission even if the water landing detection section 3 is once short-circuited and the water landing detection section 3 is opened, and provides positive feedback to the input terminal p of the Tom ND gate 16. There is. At this time, NmuN of the low frequency f2 oscillation circuit
Input terminal 0 of D gate 18 is connected to output terminal U of HAND gate 17 and has a positive potential. Since the input terminal 1 of the NAND gate 16 is also at a positive potential, this low frequency f2 oscillation circuit operates as an astable multivibrator. This oscillation output is generated by the amplitude modulation circuit 41.
1 is supplied, and this signal amplitude-modulates the signal of frequency f1 oscillated by the low frequency f1 oscillation circuit 2, and is supplied to the FM modulation circuit 5, and the signal oscillated by the high frequency oscillation circuit 1 is Modulate. Next, it is amplified by high-rise amplifier circuits 6 and 7, and a double-modulated water landing signal is transmitted from a transmitting antenna 8.

Next, when the battery voltage drops below the set value during standby, there is no short circuit between the terminal f of the voltage sensor 13 and the ground terminal e, and the input terminal S of the NAND gate 17 becomes the ground potential, and the input Since the terminal t is at a positive potential, the output terminal U is at a positive potential. At this time, the transistor 12
A base current flows through the terminal and becomes conductive, supplying power to the transmitter. At this time, the low frequency f2 oscillation circuit is NAN
Since the input terminal 1 of the D gate 16 is connected to the output terminal f of the voltage sensor 13 via the diode 21, it becomes a ground potential, the output terminal j becomes a positive potential, and the FM modulation circuit 6 receives a low frequency f2. A non-amplitude modulated low frequency f1 is supplied at , which emits a double non-modulated undervoltage signal.

Next, when the transmitting device lands on water while the battery voltage is below the set value and is transmitting a voltage shortage signal, the water landing detection section 3 is short-circuited, and the input terminal 'p' of the NARD gate 16 is short-circuited.
q is at a positive potential, and the output terminal r is at a ground potential.

At this time, the input terminal t of the NAND gate 17 becomes a ground potential, the input terminal S becomes a positive potential, and the output terminal U maintains a positive potential, and the transistor 12 maintains a conductive state and supplies power to the transmitter. ing. The input terminal 1 of the HAND gate 16 of the low frequency f2 oscillator circuit is connected to the water landing detection section 3 via the diode 28, so it has a positive potential. Since the input terminal O of the NAND gate 18 is also at a positive potential, the low frequency f2 oscillation circuit starts oscillating as an astable multivibrator, and this oscillation output is transmitted to the amplitude modulation circuit 4.
Since the water is supplied to the water, it is possible to send the same landing signal as when landing on the water while on standby.

Note that 20 is a light emitting diode, and if the voltage of the battery 9 is higher than a set value when the switch 29 is closed, it is energized to ground through the resistor 19 and emits light. On the other hand, when the voltage is below the set value, the output terminal f of the voltage sensor 13 is short-circuited to the ground terminal e, so that no light is emitted and the insufficient voltage of the battery 9 can be visually confirmed.

As described in detail above, according to the present invention, when landing on water during standby, a water landing signal is transmitted, and when the battery voltage drops below a set value, an insufficient voltage signal is transmitted. , it is possible to obtain a transmitting device for marine accident prevention that transmits a landing signal even when landing on water in this state.

[Brief explanation of drawings]

The figure is a circuit diagram of a transmitting device for marine accident prevention in one embodiment of the present invention. 1... High frequency oscillation circuit, 2... Low frequency f1 oscillation circuit, 4... Amplitude modulation circuit, 6...
...FM modulation circuit, 9, - 6.7...High frequency amplification circuit, 8...Transmission antenna, 13...Voltage sensor, 16-
18...HM ND gate, 9...Battery, 3...Water landing detection section.

Claims (1)

[Claims] a power supply unit, a signal generation unit that operates based on the voltage of this power supply unit and emits an antenna signal, a water landing detection unit that detects the presence of water, and a detection signal from the water landing detection unit that activates the power supply unit. a switch unit that supplies voltage to the signal generating unit; and a switch unit that causes the generating unit to generate an undervoltage signal when the voltage of the power supply unit falls below a certain voltage while no voltage is supplied to the signal generating unit. and means for controlling the undervoltage signal to a water landing signal different from the undervoltage signal when a detection signal is generated in the water landing detection section in this undervoltage state. A transmitter for marine accident prevention characterized by comprising means.