JPS5928479Y2 - electronic buzzer - Google Patents

Description

[Detailed description of the invention] This invention relates to an electronic buzzer that can emit multiple types of sounds using a single sounding body. The purpose of the conventional electronic buzzer is to make it possible to send messages with different meanings, and another purpose is to increase the volume by resonating with each sound even if the sounding body emits different sounds. , as shown in Fig. 1, the magnet coil L of the sounding body 1, the resistor R1, and the capacitor C1 are connected in series between the collector and base of the transistor Q, and the discharge resistor R2 is connected to the series circuit of the capacitor C1 and the resistor R1. A power supply E is connected between the center tap of the magnet coil L and the emitter of the transistor Q to form a blocking oscillation circuit 2 to make the sounding body 1 ring, and the sounding body 1 produces a sound as shown in FIG. It was housed in a box 4 having a hole 3.

In Figure 2, 5 is a printed board, 6 is an insulating board, 7 is a yoke, and 8
is a permanent magnet, and 9 is a diaphragm.

In this case, the oscillation frequency of the blocking oscillation circuit 2 cannot be changed, and
Even in the case of an electronic buzzer described in Publication No. 8, which alternately sounds at two different frequencies by switching between two types of circuit constants, there is only one resonant part made up of a resonant cylinder. Since it is tuned only to the oscillation frequency of the sounding body and its harmonic distribution, when driven at two different frequencies, -
It had the disadvantage that the volume of the sound was low.

The present invention has been devised in view of this point, and will be described in detail below with reference to Examples.

In FIG. 3, reference numeral 1 denotes a sounding body, which is sounded by a blocking oscillation circuit 2 configured in the same manner as in FIG.

Reference numeral 10 denotes an oscillation circuit, which is connected to the base of the transistor Q of the blocking oscillation circuit 2, and changes the oscillation frequency of the oscillation circuit 10 depending on the resistance values of the capacitor C3 and the resistor circuit 11, thereby changing the tone of the electronic buzzer. be.

The resistance circuit 11 is configured as shown in FIG. 4, and has a plurality of input terminals T1. When T2°T3 is provided and a signal is input to the input terminal TI, the transistor Q1 is turned on and 5CR1 is turned on, so that the resistance between the terminals a and b becomes R6, and similarly, the resistance between the terminals a and b becomes R6. When a signal enters T3, the resistances between terminals a and b become R7 and R8, respectively.

Therefore, transistor Q of blocking oscillation circuit 2
The pace potential of is controlled by the output of the oscillation circuit 10, and the output of the blocking oscillation circuit 2 as shown in FIG. 5A is controlled by the oscillation output of the oscillation circuit 100 as shown in FIG.
A current as shown in FIG. 5C flows and causes the sounding body 1 to vibrate.

Input terminals TI, T2. By adding a signal to T3, the oscillation frequency shown in Figure 5 can be changed and the ringing sound can be changed.

As shown in FIG. 6, the sounding body 1 is attached to a space 12 provided at the bottom of the box body 4, and two resonance cylinders 13,
14 is provided, and a sound output hole 3 is provided in each of the resonance tubes 13 and 14.

The resonant tubes 13 and 14 have different volumes and are designed to resonate at different frequencies.

Therefore, input end +'r1°T2. By applying a signal to either T3, the sounding body 1 vibrates at a different frequency, and depending on the frequency, either of the resonant cylinders 13, 14 resonates, and one sounding body produces many types of sounds. I can do it.

As mentioned above, the present invention connects the output of an oscillation circuit that oscillates at at least one type of different frequency to the base of the transistor of the blocking oscillation circuit, and houses the sounding body in a box with a resonant cylinder, so that it can be adjusted according to the preference. It is possible to obtain different sounds and to send messages with different meanings as needed.In addition, the oscillation circuit is equipped with multiple input terminals, and when there is no input to the input terminal, the transistor of the blocking oscillation circuit is activated. Because the blocking oscillation circuit is turned off, the blocking oscillation circuit can be controlled only when an input is input to the input terminal, making it possible to easily change the sounding frequency of the sounding element.Furthermore, there is a space in the bottom of the box to position the sounding element. , and communicated with this space, and provided multiple resonant cylinders with different volumes, and provided a sound output hole in each resonant cylinder, so even if different sounds are oscillated, they can resonate individually, increasing the volume. This has the effect of being able to

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an example of a conventional electronic buzzer, FIG. 2 is a vertical cross-sectional view of the same, FIG. 3 is a circuit diagram of an embodiment of the present invention, and FIG. 4 is a circuit diagram of a resistor circuit of the same. 5A to 5C are explanatory views of the same operation as above, and FIG. 6 is a longitudinal cross-sectional view of the same as above. 1...Sounding body, 2...Blocking oscillation circuit, 3...Sound output hole, 4...Box body, 10...Oscillation Circuit, 12...Space,
13... Resonance tube, 14... Resonance tube, Q
...transistor, T1. T2. T3...
...Input terminal, L... Magnet coil, R1
...Resistor, C1...Capacitor, R2
...Discharge resistance.

Claims (3)

[Scope of utility model registration request] (1) A magnetic coil of a sounding body, a resistor, and a capacitor are connected in series between the collector and base of a transistor, a discharge resistor is connected in parallel to the capacitor, and a center tap of the magnetic coil is connected to the emitter of the transistor. A blocking oscillation circuit is formed by connecting a power source to the oscillator, an output of the oscillation circuit that oscillates at at least one different frequency is connected to the base of the transistor, and the sounding body is housed in a box having a resonant tube. Warning electronic buzzer. (2) An electronic buzzer according to claim 1, which is a utility model, and is provided with a plurality of input terminals as an oscillation circuit, and when there is no input to the input terminal, a transistor of the blocking oscillation circuit is turned off. (3) Registration of a utility model consisting of a box with a space at the bottom in which a sounding body is placed, a plurality of resonant cylinders with different volumes communicating with this space, and a sound emitting hole in each resonant cylinder. An electronic buzzer according to claim 1.