JPS6324554Y2 - - Google Patents

Description

Detailed Description of the Invention This invention relates to an improvement in an alarm that can emit three sounds: a bell, a chime, and a siren.

In recent years, alarm devices (three-tone alarms) that can selectively generate these three sounds have been developed. When the user uses this three-tone alarm, three tones are assigned to each case in advance, and one of the three tones is selectively generated for each case. By the way, it would be more useful if a three-tone alarm device could be developed that emits alarm sounds completely different from these three sounds when some abnormal situation occurs.

Taking this into consideration, this invention was created by providing a three-tone alarm with an emergency alarm terminal and a voltage supply circuit, so that when a predetermined voltage is applied to the emergency alarm terminal, an alarm sound that is completely different from the three sounds mentioned above is generated. It is something.

An embodiment of this invention will be described below with reference to the drawings. The figure is a circuit diagram showing the configuration of the alarm device according to this invention, and in this figure, input terminal 1
a with a predetermined DC voltage (in this example, +
12V) is applied, a bell sound is generated from the speaker 2, and when the above DC voltage is applied to the input terminal 1b, a chime sound is generated from the speaker 2, and the above DC voltage is applied to the input terminal 1c. When this happens, a siren sound is generated from the speaker 2. Further, the terminal 1d is an emergency alarm terminal, and the voltage applied to the emergency alarm terminal 1d is supplied to the first to third voltage supply lines 4a to 4c via the voltage supply circuit 3. In this case, voltage supply line 4a is connected to input terminal 1a via diode 5, and voltage supply lines 4b and 4c are connected to input terminals 4b and 4c, respectively. Further, the power supply circuit 3 is composed of diodes 6 and 7. Then, when the above DC voltage (+12V) is applied to the emergency alarm terminal 1d, the same DC voltage is supplied to each of the power supply lines 4a to 4c, and as a result, a bell sound is heard from the speaker 2.
An alarm sound that is completely different from chime and siren sounds is generated.

The circuit shown in the figure will be explained in more detail below.

First, numerals 10 and 11 are oscillation circuits.
The oscillation circuit 10 (first oscillation circuit) is a circuit that generates a periodic signal that is the basis of the signal sound generated from the speaker 2, and its oscillation frequency is connected to the terminals T ₁₀ and T ₁₃
It is basically determined by the resistor 12 inserted between the terminals T _{13 and} T 12 , the resistor 13 inserted between the terminals T 13 and T ₁₂ , and the capacitor 14 inserted between the terminal T ₈ and ground. The oscillation frequency can be changed depending on the voltage applied to the terminal _T11 . In this case, when an "H" (high) level voltage is applied to the terminal _T11 , the oscillation frequency becomes low, and as a result, a relatively low sound is generated from the speaker 2, and the terminal
When an "L" (low) level voltage is applied to _T11 , the oscillation frequency increases, and as a result, the speaker 2 generates a relatively high-pitched sound. Further, the oscillation output of the oscillation circuit 10 is output from the terminal T9, and the oscillation output of the oscillation circuit ₁₀ is output from the terminal T9.
5 to Darlington-connected transistors 16 and 17, thereby driving the speaker 2. The transistors 16 and 17 receive an oscillation signal from the oscillation circuit 10 and an oscillation circuit 11 to be described later.
A composite drive circuit is configured to combine the oscillation signals of and drive the speaker 2.

The oscillation circuit 11 (second oscillation circuit) is a circuit that determines the cycles of the bell sound, chime sound, and siren sound. Here, the bell sound is a sound of the same frequency that is sounded intermittently, and for example, a signal sound such as "Kang, Kang, Kang..." is generated continuously, like a warning sound at a railroad crossing. be. Furthermore, the chime sound is a sound that alternates between sounds of different frequencies, so that the signal sound "ping, pop, ping, pop..." is generated continuously. Furthermore, the siren sound is a continuous sound with smooth frequency modulation. Then, the oscillation circuit 11 generates a bell sound.
The cycle of "Kang...", the chiming sound "Ping, Pong..."
...'' period and the frequency modulation period of the siren sound are determined respectively. The oscillation frequency of this oscillation circuit 11 is determined by the resistor 19 inserted between the terminals T ₄ and T ₁ , the terminals T ₁ ,
It is determined by the resistor 20 inserted between T ₂ and the terminal T ₆ and the capacitor 21 inserted between the ground and the oscillation output is output from the terminal T ₅ . Note that the capacitor 22 inserted between the terminal T ₃ and the ground is a capacitor for noise removal. Furthermore, the oscillation circuits 10 and 11 described above are composed of one
It is composed of IC (semiconductor integrated circuit).

Therefore, a predetermined DC voltage is applied only to the input terminal 1a.
When V ₁ (+12V) is applied, the same voltage V ₁ is supplied to the terminals T ₁₀ and T ₁₄ of the oscillation circuit 10 and the terminal T ₄ of the oscillation circuit 11 through the diode 5 and the resistor 24, and thereby, Oscillation circuits 10 and 11 are each driven. In addition, the same voltage V ₁ is applied to the NAND gate 2 via the diode 5, resistor 24, and resistor 25.
6 and the second input terminal of NAND gate 27, respectively. In this case, Nand Gate 26
The second input terminal of the NAND gate 27 and the first input terminal of the NAND gate 27 are both supplied with a ground potential via resistors 28 and 29. Therefore, the NAND gate 26 and 27
Each output of will be a voltage V ₁ . The output of the NAND gate 26 is supplied to the base of the transistor 33 via the resistor 31 and the diode 32, and the output of the NAND gate 27 is supplied to the base of the transistor 33 via the resistor 34 and the diode 32.
5 to the connection point between resistors 19 and 20. The transistor 33 is for turning on/off the signal path of the capacitor 36, and when the output voltage V ₁ of the NAND gate 26 is supplied to its base,
The transistor 33 is cut off, and the signal path of the capacitor 36 is therefore cut off. Note that the function of the capacitor 36 will be explained later. When the output voltage V ₁ of the NAND gate 27 is supplied to the connection point between the resistors 19 and 20, the oscillation circuit 11 oscillates at an oscillation frequency determined by the resistor 20 and the capacitor 21 (this frequency is assumed to be ₁ ). (The value of the resistor 19 becomes irrelevant to the oscillation frequency.) Furthermore, the ground potential supplied to the second input terminal of the NAND gate 26 is further applied to the second input terminal of the NAND gate 38.
Supplied to the input end. As a result, Nand Gate 3
8, its output becomes voltage V ₁ regardless of the signal supplied to its first input terminal, and this voltage V ₁ is applied to transistor 4 via resistor 39 and diode 40.
1 base. This causes the transistor 41 to be cut off.

Further, a ground potential is supplied to the second input terminal of the NAND gate 43 via resistors 44 and 45. As a result, the output of the NAND gate 43 becomes voltage V ₁ regardless of the signal at its first input terminal.
This voltage _V1 is supplied to the base of transistor 48 via resistor 46 and diode 47, and transistor 48 is cut off. When the transistors 41 and 48 are both cut off in this way, the voltage obtained at the terminal _T11 of the oscillation circuit 10 becomes an "L" level voltage, so that the oscillation circuit 10 operates at a relatively high frequency (this frequency
oscillates at F ₁ ).

In this way, when the voltage V ₁ is supplied to the input terminal 1a, the oscillation circuit 11 oscillates at frequency ₁ , and the oscillation circuit 10 oscillates at frequency F ₁ . However, in this case, the relationship between frequency ₁ and F ₁ is _{1≫F 1} .

Now, the oscillation circuit 11 oscillates, and its output (terminal
When T ₅ ) goes to ground level, transistor 50
The base current flows through the resistor 51 and the capacitor 52, thereby turning on the transistor 50. This on state is continued until charging of the capacitor 52 is completed. On the other hand, when the output of the oscillation circuit 11 reaches the voltage _V1 , the transistor 50 is cut off. That is, when the oscillation circuit 11 oscillates at frequency ₁ , the transistor 50 repeats on/off at the same frequency ₁ accordingly. Then, when the transistor 50 is turned on, a base current is supplied to the transistor 16 via the resistor 54. Note that the resistor 56 is a shunt resistor for the base current of the transistor 50, and the diode 57 is for blocking the reverse voltage generated by the capacitor 52. On the other hand, the base of the transistor 16 is pulled down to the ground level by the output of the oscillation circuit 10 at a period of 1/F ₁ . As a result, an intermittent current flows through the base of the transistor 16 at a period of 1/F ₁ only when the transistor 50 is in the on state. Repeat on/off with F ₁ . Thus, the above-mentioned bell sound is generated from the speaker 2.

Next, a case will be described in which the voltage V ₁ is applied only to the input terminal 1b. In this case, the above voltage
V ₁ is supplied to the voltage supply line 4a via the diode 59, thereby supplying the voltage V ₁ to each of the oscillation circuits 10 and 11, as well as the first input terminal of the NAND gate 26 and the second input terminal of the NAND gate 27. A voltage V ₁ is supplied to. Further, the voltage V ₁ is applied to the NAND gate 26 via the diode 60 and the resistor 28.
a second input terminal of the NAND gate 27, a first input terminal of the NAND gate 27,
They are respectively supplied to second input terminals of the NAND gate 38.

When the voltage V ₁ is supplied to both input terminals of the NAND gate 26, the output of the NAND gate 26 becomes the ground level, and the transistor 33 is turned on.
Thereby, the capacitor 36 is equivalently inserted in parallel with the capacitor 21. When the voltage V ₁ is supplied to both input terminals of the NAND gate 27, the output of the NAND gate 27 becomes the ground level.
The diode 35 cuts off the output from the output of the output terminal. As a result, the oscillation frequency of the oscillation circuit 11 becomes frequency ₂ ( ₂ < ₁ ) determined by the resistors 19 and 20 and the capacitors 21 and 36.

Also, a voltage is applied to the second input terminal of the NAND gate 38.
When V ₁ is supplied, the NAND gate 38 operates as a mere inverter, so that the inverted output of the oscillation circuit 11 is output from its output terminal, and the transistor 41 repeats the on/off operation at frequency ₂ . Then, when the transistor 41 is turned on, the voltage V ₁ is supplied to the terminal T ₁₁ of the oscillation circuit 10 via the resistor 62. That is, as the transistor 41 repeatedly turns on and off, the terminal
The voltage obtained at T ₁₁ repeats "H"level/"L" level, and as a result, the oscillation frequency of the oscillation circuit 10 changes F ₂ /F ₁ (however, F ₂ <F ₁ ) with a period of _1/2 . Repeat. Note that the frequency _F2 is the oscillation frequency when the voltage at the terminal _T11 is at the "H" level. Further, in this case, the output of the NAND gate 43 is at the voltage _V1 , so the transistor 48 is in an off state.

Therefore, when the output of the oscillation circuit 11 becomes the ground level, the base current of the transistor 50 changes to the resistor 5.
1, flows through the capacitor 52, thereby
Current is supplied to the base of transistor 16.
At this time, the output of the NAND gate 38 becomes the voltage _V1 , the transistor 41 is cut off, and the oscillation circuit 10 oscillates at the frequency _F1 . As a result, transistors 16 and 17 are turned on and off at frequency F ₁ , thereby producing a relatively high signal tone from speaker 2 . On the other hand, when the output of the oscillation circuit 11 becomes the voltage _V1 and the output of the NAND gate 38 becomes the ground level, the base current of the transistor 50 flows through the resistor 65 and the capacitor 66, thereby turning on the transistor 50.
At this time, since the transistor 41 is turned on, the voltage at the terminal _T11 of the oscillation circuit 10 becomes "H" level, and therefore the oscillation frequency of the oscillation circuit 10 becomes _F2 . As a result, transistor 16,
17 repeats the on/off operation at frequency F ₂ , which causes the speaker 2 to generate a relatively low signal tone. In this way, the chime sound is generated.

Note that when voltage V ₁ is applied to input terminal 1b,
This voltage V ₁ is applied to the transistor 6 through a resistor 68.
9 is applied to the base of transistor 9, thereby turning on transistor 69, and capacitor 70 is interposed between the collector of transistor 50 and ground. This capacitor 70 can give a unique effect to the chime sound.

Next, a case will be described in which the voltage V ₁ is applied to the input terminal 1c. In this case, the voltage V ₁ is supplied via the diode 72 to the voltage supply line 4a, and also via the diode 73 and the resistor 44 to the second input terminal of the NAND gate 43. Also,
Second input terminal of NAND gate 26, NAND gate 2
The ground potential is supplied to the first input terminal of 7 through resistors 28 and 29, and as a result, the oscillation circuit 11 oscillates at frequency ₁ as in the case of the bell sound. Further, the ground potential is supplied to the second input terminal of the NAND gate 38, thereby turning off the transistor 41.

Then, a voltage is applied to the second input terminal of the NAND gate 43.
When V ₁ is supplied, the NAND gate 43 operates as an inverter, and the inverted output of the oscillation circuit 11 is output from its output terminal. As a result, the transistor 48 repeats on/off operations at frequency ₁ . When the transistor 48 repeats the on/off operation, the capacitor 75 repeats charging and discharging at a frequency _{of 1} , and as a result, the terminal of the oscillation circuit 10
A smoothly varying voltage is applied to T ₁₁ via the diode 76 . Note that the resistor 77 is a discharge resistance of the capacitor 75. Thus, the output of the oscillation circuit 10 becomes a signal that is smoothly frequency modulated. Then, the output of the oscillation circuit 10 is applied to the base of the transistor 16 via the diode 15, whereby a frequency-modulated siren sound is generated from the speaker 2.

Next, a case will be described in which the voltage _V1 is applied to the emergency alarm terminal 1d. In this case, voltage V ₁ is supplied via diodes 6 and 72 to the first voltage supply line 4a, via diode 7 to the second voltage supply line 4b, and via diode 6 to the third voltage supply line 4a. is supplied to the voltage supply line 4c.
As a result, the outputs of the NAND gates 26 and 27 both become the ground potential, so that the oscillation circuit 11 oscillates at a frequency _{of 2} as in the chime sound.
Further, since the voltage V ₁ is supplied to each second input terminal of the NAND gates 38 and 43, both the NAND gates 38 and 43 operate as an inverter, and therefore, the transistors 41 and 48 both operate at a high frequency.
Press ₂ to turn on/off. In this case, when the transistor 41 is on, the transistor 48 is turned off, and when the transistor 41 is off, the transistor 48 is turned on. As a result, a composite voltage of the voltage supplied via the resistor 62 and the voltage supplied via the diode 76 is obtained at the terminal T ₁₁ of the oscillation circuit 10, which causes the speaker 2
generates an alarm sound with a frequency based on the composite voltage, that is, an alarm sound different from any of the bell sound, chime sound, and siren sound.

As explained above, according to this invention, a three-tone alarm is provided with an emergency alarm terminal and a voltage supply circuit, so it is possible to generate an alarm sound that is completely different from a bell sound, a chime sound, and a siren sound with a simple configuration. The effect that can be obtained is obtained. Also, depending on which three of the four input terminals the voltage is applied to,
selectively generating three types of sounds, and simultaneously applying a voltage to at least two of the three input terminals when a voltage is applied to another input terminal; Since the structure is configured to generate sounds, it is possible to generate four types of sounds using an alarm device that selectively generates three types of sounds, thereby simplifying the configuration.

Therefore, for a three-tone alarm that selectively generates three types of sounds depending on which of the three input terminals voltage is applied, voltage is applied to the emergency alarm terminal and this emergency alarm terminal. It is only necessary to include a voltage supply circuit that simultaneously applies voltage to at least two of the three input terminals when the fourth alarm is applied, and an alarm that generates the fourth alarm sound can be provided with a simple configuration.

[Brief explanation of the drawing]

The drawing is a circuit diagram showing the configuration of one implementation of this invention. 1d...Emergency alarm terminal, 2...Speaker, 3...
...Voltage supply circuit, 4a...First voltage supply line, 4
b...Second voltage supply line, 4c...Third voltage supply line.

Claims (1)

[Claims for Utility Model Registration] A first oscillation circuit that oscillates with a relatively short cycle and whose oscillation frequency changes according to the magnitude of an input control signal; a second oscillation circuit whose oscillation frequency changes according to the magnitude of the control signal; a composite drive circuit that combines the oscillation signals of the first and second oscillation circuits to drive the speaker; , a third and a fourth input terminal, and a combination of sizes in the first and second oscillation circuits when a voltage is applied to the first, second, or third input terminal. a control circuit that outputs different control signals; and a voltage supply that applies voltage to at least two of the first, second, and third input terminals when a voltage is applied to the fourth input terminal. An alarm device comprising a circuit.