JPH0637517Y2 - Notification signal processing circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a notification signal processing circuit for performing combined notification such as visitor notification and crime prevention notification.

[Prior Art] FIG. 2 shows a circuit of a conventional example. In this conventional example circuit, an alarm sound output unit 1a that outputs a chime sound, an alarm sound output unit 1b that outputs a tremolo sound, and a buzzer. An alarm sound output unit 1c for outputting a sound is provided, and detector connection terminals 4a to 4c are provided for connecting the alarm 2 or the push button switch unit 3 composed of a single push button switch, respectively.

Each of the detector connection terminals 4a to 4c is pulled up to the power supply voltage Vcc through the resistors Ra to Rc, and each of the resistors Ra to Rc is in a state where the corresponding detector connection terminals 4a to 4c do not become "L". A base current is passed through the transistors Qa to Qc to turn it on,
The collectors of the transistors Qa to Qc are set to "L".
The "H" collector outputs of these transistors Qa to Qc serve as detection signals for driving the above-mentioned notification sound output units 1a to 1c.

At the same time, the detection signal is transferred to the outside so that it is input to the detection output unit 6 through the OR circuit 5.

Here, the detector 2 is, for example, the detector connection terminal 4a or 4b.
The switch SW is connected between the common ground terminal 7 and the common ground terminal 7, and at the same time, power is supplied through the resistor Ra or Rb, or if necessary, the power terminal is connected to the power terminal 8 to receive power. The sensor connection terminal 4a or 4b, which is connected by turning on the switch SW during detection operation, is set to "L", and the corresponding transistor Qa or Qb is inverted to OFF and detected as the corresponding alarm sound output unit 1a or 1b. Output unit 6
A notification signal is given to and the detection signal is sent at the same time when the notification sound is emitted.

On the other hand, the push button switch section 3 is connected between, for example, the detector connection terminal 4c and the push button connection terminal 9, and when turned on, a base current is caused to flow through the push button switch section 3 to the transistor Qd connected to the push button connection terminal 9 side. Turn on Qd,
A cancel signal of "L" is given to the cancel signal input terminal of the detection output unit 6.

That is, while the cancel signal is input to the detection output unit 6, the detection signal is given to the notification sound output unit 1c to generate the notification sound, but the detection signal transmission from the detection output unit 6 is stopped. There is.

[Problems to be Solved by the Invention] By the way, as described above, the notification signal including the push-button switch unit 3 that stops the sending of the detection signal (that is, the transfer signal) from the detection output unit 6 together with the output of the notification sound. In the processing circuit, it is necessary to keep pressing the push button switch section 3 in order to continuously generate the notification sound accompanying the push button switch section 3 for a predetermined time. However, if the push button switch section 3 is continuously pressed in such a manner, the cancel signal continues to be output, so that the detection output section 6 does not output the detection signal (transfer signal) even if the detector 2 operates. . That is, there is a problem that the detection output unit 6 does not transfer the information to the outside.

When power is supplied through the resistor Rb like the detector 2 connected to the detector connection terminal 4b, when the push button switch section 3 is commonly connected to the detector connection terminal 4b and used, the push button When the switch portion 3 is continuously pressed, the voltage of the detector connection terminal 4b is lowered and the detector 2 cannot be supplied with a sufficient power supply voltage, which causes a problem that the function of the detector 2 does not work. As shown in the figure, the push button switch section 3 and the detector 4 had to use different detector connection terminals.

The present invention has been made in view of the above problems, and its purpose is to enable the detection signal of the detector to be transmitted even if the push button switch is continuously pressed, and to detect even if the push button switch is further pressed. Signal processing circuit that makes it possible to connect the detector and the push button switch in common to the detector connection terminal with a short voltage drop at the device connection terminal, and does not require special modification of the conventional circuit configuration. To provide.

[Means for Solving the Problems] In order to achieve the above object, the present invention is pulled up to a power supply voltage via a switch unit of a two-terminal type detector, a two-terminal type push button switch, and a resistor. A plurality of detector connection terminals, a common ground terminal for commonly connecting the other end of the switch portion of the detector, one end of which is connected to one of the detector connection terminals, and one end of any of the detector connection terminals A push button connection terminal for connecting the other end of the push button switch
An alarm sound output section that is provided corresponding to each of the detection connection terminals and that operates when either the switch section or the push button switch of the detector connected to each of the detector connection terminals is turned on, and the detector. When the switch part of the detector connected between the connection terminal and the common ground terminal is turned on, the detection signal is taken in and the detection signal is sent out, and when the push button switch is turned on, the detection signal is received by receiving the signal current flowing through the push button switch. In the notification signal processing circuit having a detection output section for stopping the transmission of the signal, a parallel circuit of a capacitor and a resistor is inserted in series in the path of the signal current.

[Operation] Therefore, in the present invention, when the push button switch is turned on, a signal current flows through the capacitor to be charged, and even if the push button switch is continuously pressed, only the signal current controlled by the resistor finally flows, and substantially, Means that the push button switch is turned off.

Therefore, the stop of sending the detection signal from the detection output section is released, the detection operation of the detector becomes effective, and the voltage drop time of the detector connection terminal to which the pushbutton switch is connected is short, so the detector is connected to the detector connection terminal in common. In this case, it is possible to prevent the detection function of the detector from stopping.

[Embodiment] The present invention will be described below with reference to an embodiment.

FIG. 1 shows the circuit of the present embodiment, which is basically the same as the circuit of FIG. 2 except for the circuit configuration of the push button switch section 3, and the same components have the same numbers as those of the circuit of FIG. Or a symbol is attached.

As shown in the figure, the push button switch section 3 is formed by connecting the push button switch 3a in series with a parallel circuit of a capacitor C ₀ and a resistor R ₀ .

Thus it was momentarily capacitor C ₀ and the signal current flows into the capacitor C ₀ when turning on the push button switch 3a of the push button switch portion 3
Is charged, and the resistance R ₀
Only the signal current limited by will flow. Therefore, the transistor Qd is also turned off, the cancel signal input terminal of the detection output unit 6 is pulled up to the power supply voltage Vcc through the resistor Rd, and the detection output can be sent. Therefore, the detection signal can be sent regardless of which switch SW of any of the detectors 4 is turned on thereafter.

The capacitor C ₀ resistors R ₀ connected in parallel to is to release the electric charge of the capacitor C _0, when again pressing switch 3a after pressure release of the push-button switch 3a is operated, a new cancel signal With the function to enable output,
Detector connection terminal 4c is "L" when the push switch 3a is continuously pushed.
It also has the function of The resistance value of the resistor R ₀ is set so as to be a base current that does not turn on the transistor Qd when the capacitor C ₀ is charged.

Further, as described above, even if the push button switch 3a is continuously pressed, only the signal current limited by the resistance R ₀ finally flows, so that, for example, as in the detector 2 connected to the detector connection terminal 4b, When power is supplied through the resistor Rb, even if the push button switch 3a is commonly connected to the detector connection terminal 4b and used, after the detection signal output from the detection output unit 6 is stopped, the push button switch 3a Even if the button is kept pressed, the voltage of the detector connection terminal 4b is not lowered, a sufficient power supply voltage can be applied to the detector 2, and the detector 2 can be operated normally. That is, even if the detector 2 and the push button switch 3a are commonly connected to the detector connection terminal 4b, the detection function of the detector 2 is not affected.

Further, the voltage drop at the detector connection terminal 4c connecting the push button switch 3a is also instantaneous.

[Advantages of the Invention] In the present invention, since the parallel circuit of the capacitor and the resistor is inserted in series in the path of the signal current flowing when the push button switch is turned on in the signal processing circuit for informing, even if the push button switch is pressed continuously, Only the signal current limited by the resistance flows through the switch, and the push button switch is practically turned off.
Therefore, the detection signal sending stop of the detection output section is released, the detection operation of the detector becomes effective, and the voltage drop time of the detector connection terminal connecting the push button switch is short, so the detector connection terminal connecting the push button switch Even if the switch part of the detector is connected in common, the detection function of the detector is not affected.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is a circuit diagram of a conventional example. 1a to 1c are an alarm sound output section, 2 is a detector, 3 is a push button switch section, 3a is a push button switch, 4a to 4c are detector connection terminals, 6 is a detection output section, 7 is a common ground terminal, and 9 is a push button connection Terminal, C ₀
Is a capacitor and R ₀ is a resistor.

Claims (1)

[Scope of utility model registration request] 1. A switch unit of a two-terminal type detector, a two-terminal type push button switch, a plurality of detector connecting terminals pulled up to a power supply voltage through resistors, and any one of the above detector connecting terminals. A common ground terminal commonly connected to the other end of the switch portion of the detector having one end connected to the pin, and a push button connection terminal connected to the other end of the push button switch having one end connected to one of the detector connection terminals. A notification sound output section that is provided corresponding to each of the detector connection terminals and that operates when any one of the switch section and the push button switch of the detector connected to each of the detector connection terminals is turned on, When the switch part of the detector connected between the detector connection terminal and the common ground terminal is turned on, the detection signal is taken in and the detection signal is sent out, and when the push button switch is turned on, the signal current flowing through the push button switch is received. And a detection output unit for stopping the transmission of the detection signal, wherein a parallel circuit of a capacitor and a resistor is serially inserted in the signal current path. .