JP4277760B2 - Buzzer sounding device - Google Patents

Description

  The present invention relates to a buzzer sounding device that sounds a buzzer.

  Conventionally, a buzzer sounding device that sounds a buzzer according to the output of a sensor or the operation of a switch has been used for disaster prevention or crime prevention (for example, see Patent Document 1).

  This type of buzzer sounding device has applications that require a large volume for disaster prevention and other applications that do not require a particularly large volume, such as a nurse call, but require a sound quality according to the location and type of call. . And in the plural kinds of buzzer sounding devices used for different applications as described above, the printed wiring in which the conductive pattern is formed so that the plural kinds of sounding circuits each composed of the buzzer and the drive circuit for driving the buzzer can be mounted. By using a board and a control means such as a microcomputer capable of outputting a plurality of types of drive signals corresponding to a plurality of types of ringing circuits, the printed wiring board and the control means can be shared, thereby reducing manufacturing costs. Proposed.

Conventionally, a switch for manually selecting a drive signal output by the control means is provided, and the switch is switched according to a ringing circuit mounted on a printed wiring board.
JP 2004-151180 A

  However, if the switch is set incorrectly, there is a problem that the required sound quality and volume cannot be obtained because an appropriate drive signal is not output.

  The present invention has been made in view of the above-mentioned reasons, and its purpose is to make a buzzer sound that the control means reliably outputs an appropriate drive signal corresponding to the sound circuit while sharing the control means and the printed wiring board. To provide an apparatus.

The invention according to claim 1 is a printed wiring board capable of selecting and mounting one type of ringing circuit among a plurality of types of ringing circuits each comprising a buzzer and a drive circuit for driving the buzzer, and any ringing circuit on the printed wiring board. And a control means for generating a drive signal for driving the drive circuit of the detected ringing circuit, and the ringing circuit mounted on the printed wiring board is selected from two types. When one ringing circuit is mounted on the board, the printed circuit board has a detection point where the starting potential is higher than when the other ringing circuit is mounted. The control means is composed of a microcomputer, and the control means receives the potential at the detection point at the start-up. And over DOO, characterized in that a common and port for outputting a driving signal.

According to this invention, the control means and the printed wiring board can be shared. In addition, since the control means detects the ringing circuit mounted on the printed wiring board, unlike the case where it is manually selected using a switch, there is no risk of setting mistakes, and the control means uses an appropriate drive signal corresponding to the ringing circuit. Is output reliably. Furthermore, the ringing circuit can be detected with a relatively simple configuration. Further, the number of ports required for the microcomputer is reduced as compared with the case where the port to which the potential of the detection point is input at the time of activation and the port from which the drive signal is output are separated. Therefore, it is possible to reduce the manufacturing cost by using an inexpensive microcomputer with a small number of ports, and to use the remaining ports of the microcomputer for other purposes.

Since the present invention includes control means for detecting which ringing circuit is mounted on the printed wiring board and generating a drive signal for driving the detected driving circuit of the ringing circuit, the control means and the printed wiring board are provided with Can be shared. In addition, since the control means detects the ringing circuit mounted on the printed wiring board, unlike the case where the drive signal is manually selected using a switch, there is no possibility of setting mistakes, and the control means is appropriate for the ringing circuit. A reliable drive signal is output. Furthermore, the ringing circuit can be detected with a relatively simple configuration. Further, the number of ports required for the microcomputer is reduced as compared with the case where the port to which the potential of the detection point is input at the time of activation and the port from which the drive signal is output are separated. Therefore, it is possible to reduce the manufacturing cost by using an inexpensive microcomputer with a small number of ports, and to use the remaining ports of the microcomputer for other purposes.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  In the present embodiment, as shown in FIG. 1, a first ringing circuit 1 having a self-excited first piezoelectric buzzer BZ1 capable of outputting a large volume, and a second separately-excited second type capable of changing sound quality. A buzzer block BB having a printed wiring board (not shown) on which a conductive pattern on which one of the second ringing circuit 2 having the piezoelectric buzzer BZ2 can be selectively mounted and a drive signal are output to the ringing circuit It comprises a control block CB having a microcomputer 3 as control means. Further, the control block CB is supplied with power to the microcomputer 3, and for example, 12V power supplied to the first ringing circuit 1 or the second ringing circuit 2 through the power supply terminal T1 (see FIG. 2) of the buzzer block BB. Are respectively provided.

  As shown in FIG. 2, in the first piezoelectric buzzer BZ1 of the first drive circuit 1, the feedback electrode F is connected to the power source via the resistor R1, the main electrode M is connected to the power source via the resistor R2, The diaphragm electrode G is connected to the ground via the control transistor DT1. The first driving circuit 1 includes a transistor Q1 connected between the main electrode M and the diaphragm electrode G of the first piezoelectric buzzer BZ1 and having a base connected to a power source via a resistor R3 and a resistor R1. Prepare. The first ringing circuit 1 configured as described above charges the first piezoelectric buzzer BZ1, charges the transistor Q1, and turns on the transistor Q1, while a voltage higher than the base-emitter voltage is applied to the base of the control transistor DT1. By repeatedly discharging the first piezoelectric buzzer BZ1, turning off the transistor Q1, charging the first piezoelectric buzzer BZ1,..., The first piezoelectric buzzer BZ1 rings at a high volume.

  The second piezoelectric buzzer BZ2 of the second ringing circuit 2 has one terminal connected to the power supply and the other terminal connected to the ground via an npn transistor DT3. The second ringing circuit 2 includes a pnp-type control transistor DT2 whose emitter is connected to the power supply via the resistor R4 and whose collector is connected to the base of the control transistor DT2, and a second piezoelectric buzzer BZ2. And a Zener diode ZD1 that keeps the potential of the emitter of the control transistor DT2 constant. The second ringing circuit 2 configured as described above can cause the second piezoelectric buzzer BZ2 to generate a sound corresponding to the frequency of the AC signal input to the base of the control transistor DT2.

  The buzzer block BB has a control terminal T3 connected to the base of the control transistor DT1 of the first ringing circuit 1 or the base of the control transistor DT2 of the second ringing circuit 2, and an output for stopping the buzzer. Buzzer stop terminal T5 and a ground terminal T6 for sharing the ground with the control block CB. The control terminal T3, the buzzer stop terminal T5, and the ground terminal T6 are connected to the microcomputer 3 of the control block CB, respectively. Between the buzzer stop terminal T5 and the ground, a first stop switch SW1 composed of a changeover switch and having one contact at high impedance and a second stop switch SW2 composed of a contact switch are connected in parallel to each other. Therefore, the microcomputer 3 performs a normal operation to be described later only when the buzzer stop terminal T5 has a high impedance, and does not output a drive signal when the buzzer stop terminal T5 has a low impedance. Yes. That is, if one of the first stop switch SW1 and the second stop switch SW2 is closed, the piezoelectric buzzers BZ1 and BZ2 do not ring.

  Here, in the conductive pattern of the printed wiring board, a point electrically connected to the base of the control transistor DT1 of the first ringing circuit 1 or the base of the control transistor DT2 of the second ringing circuit 2 is detected point A. Then, immediately after the power is turned on, the detection point A is connected to the ground via the bias resistance of the control transistor DT1 of the first ringing circuit 1 when the first ringing circuit 1 is mounted. Is 0 V, and when the second ringing circuit 2 is mounted, the detection point A is connected to the cathode side of the Zener diode ZD1 via the bias resistor of the control transistor DT2 of the second ringing circuit 2. Therefore, the potential at the detection point A becomes the Zener voltage of the Zener diode ZD1. That is, the control terminal T3 is connected to the detection point A on the printed wiring board.

  The buzzer block BB includes a power display terminal T2, and a light emitting diode LD is connected between the power display terminal T2 and the ground. While the power is on, the light emitting diode LD is lit by the power generated by the power circuit 4 and supplied via the power display terminal T2.

  This embodiment is a centralized monitoring system for a water level abnormality detector that detects, for example, an abnormal rise or drop in the water level of a building water tank, a centralized monitoring system for equipment abnormality / fault detectors, or a centralized monitoring system for nurse calls. Used for receivers in the system. When used in a centralized monitoring system for water level abnormality detectors and a centralized monitoring system for abnormality / failure detectors, a first ringing circuit 1 capable of outputting a large volume is mounted on a printed wiring board, and a centralized monitoring system for nurse calls. Then, the second ringing circuit 2 capable of selecting a sound quality that hardly gives stress to the listener is mounted on the printed wiring board. For example, as shown in FIG. 3, the receiver includes a rectangular main body 51 having one open surface and a lid that is connected to one end of the main body 51 via a hinge portion so that the main body 51 can be freely opened and closed. A housing 5 including a portion 52 is provided. The buzzer case 61 that houses the buzzer block BB is held by the lid 52, the control case 62 that houses the control block CB is held by the main body 51, and the buzzer block BB and the control block CB are electrically connected via the electric wire 7. It is connected to the. The lid 52 holds two display cases 8 each having a plurality of lamps and provided with a plurality of windows for guiding the light of the lamps to the outside of the housing 5. A centralized monitoring system for a water level abnormality detector will be described as an example. The receiver is connected to a water level abnormality detector (not shown) provided in each of a plurality of water tanks, and the lamp is paired with the water level abnormality detector in advance. If an abnormal rise or fall (hereinafter referred to as “abnormality”) of the water level in the water tank is detected by any of the water level abnormality detectors, the receiver detects which water level abnormality. Whether or not an abnormality has been detected in the device is notified by turning on the lamp of the display case 8, and the piezoelectric buzzers BZ1 and BZ2 are sounded. Here, as shown in FIG. 2, the buzzer block BB includes a lamp check terminal T4 and a lamp check switch SW3 which is an a-contact switch and is connected between the lamp check terminal T4 and the ground. When the lamp check switch SW3 is closed, the lamp in the display case 8 is lit regardless of the operation of the water level abnormality detector so that the operation of the lamp can be confirmed.

  Next, the operation of the microcomputer 3 of the present embodiment will be described using the flowchart of FIG.

  When the power is turned on (S1), the microcomputer 3 detects the potential of the control terminal T3, and compares the detected potential with a predetermined threshold set between the Zener voltage of the Zener diode ZD1 and 0V ( S2). When the potential detected in step S2 is smaller than the threshold value, the microcomputer 3 determines that the first ringing circuit 1 is mounted on the printed wiring board, and the first ringing as a drive signal to be output later. The first drive signal corresponding to the circuit 1 is selected (S3). On the other hand, when the potential detected in step S2 is larger than the threshold value, the microcomputer 3 determines that the second ringing circuit 2 is mounted on the printed wiring board, and the second ringing is used as a drive signal to be output later. A second drive signal corresponding to the circuit 2 is selected (S4).

  After that, it waits until a predetermined alarm signal is input (S5), and if the alarm signal is input, the drive signal selected in step S3 or S4 is used as the control terminal T3 for the period until the alarm signal is ended. (S6, S7). The alarm signal is, for example, a signal indicating that an abnormality has been detected in any of the water level abnormality detectors in the centralized monitoring system of the water level abnormality detector, and is called in any hospital room in the centralized monitoring system of the nurse call. It is a signal indicating that there was. When the warning signal is finished, the output of the drive signal is stopped (S8) and the process returns to step S5 again. Here, in the microcomputer 3, the port to which the potential of the control terminal T3 is input at the time of activation and the port to output the drive signal are common. With this configuration, the number of ports required for the microcomputer 3 is reduced as compared with the case where the port to which the potential of the control terminal T3 is input at the time of startup and the port from which the drive signal is output are separated. Therefore, the manufacturing cost can be reduced by using an inexpensive microcomputer having a small number of ports. Alternatively, the surplus port of the microcomputer can be used for another purpose.

  According to the above configuration, the microcomputer 3 and the printed wiring board can be shared in two types of buzzer sounding devices including different sounding circuits 1 and 2. Further, since the microcomputer 3 determines whether the first ringing circuit 1 or the second ringing circuit 2 is mounted on the printed wiring board and automatically selects the drive signal, the drive signal is manually selected using a switch. Unlike the case of selecting, there is no fear of setting mistakes, and the microcomputer 3 reliably outputs an appropriate drive signal.

It is a block diagram which shows embodiment of this invention. It is a circuit diagram which shows a buzzer block same as the above. It is a perspective view which shows the receiver used same as the above, (a) shows the state which closed the cover part, (b) shows the state which opened the cover part. It is a flowchart which shows operation | movement of a microcomputer same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st ringing circuit 2 2nd ringing circuit 3 Microcomputer

Claims (1)

A printed wiring board capable of selecting and mounting one type of ringing circuit among a plurality of types of ringing circuits each consisting of a buzzer and a drive circuit for driving the buzzer;
A control means for detecting which ringing circuit is mounted on the printed wiring board and generating a drive signal for driving the drive circuit of the detected ringing circuit ;
The ringing circuit mounted on the printed wiring board is selected from two types,
When one ringing circuit is mounted on the printed wiring board, the printed wiring board has a detection point where the potential at startup is higher than when the other ringing circuit is mounted,
The control means detects the potential of the detection point at the time of activation, and generates a drive signal corresponding to the detected potential,
The buzzer sounding device characterized in that the control means is composed of a microcomputer, and in the control means, the port to which the potential of the detection point is inputted at the time of activation and the port for outputting the drive signal are made common .

Images