The buzzer is the name of the historical origins. The first is a buzzer Mechanical electromagnetic structure, its principles and the same old-fashioned bells, is to rely on Intermittent circuit to achieve the high-frequency sound. Because it can only issue a relatively monotonous voice, it was known as the buzzer.
Then, people used the exchange to attract coil attached to the membrane vibration of the metal to achieve sound, which is electromagnetic buzzer, sales are on the market today. This principle of the buzzer and speakers or headset is very similar to also be able to issue some of the more complicated voice.
On the market today is the largest number of piezoelectric ceramic buzzer. Buzzer that uses piezoelectric ceramics driven Diaphragm vibration, the structure is simple and the cost of production has decreased a lot, the piezoelectric buzzer-increasing application. We talk a buzzer, generally refers to the piezoelectric buzzer.
Buzzer was known as the buzzer, and its two main characteristics about.
First, the frequency response of the buzzer relatively narrow scope, can only issue a relatively monotonous tone of Health;
Second, the buzzer sound pressure output in general is relatively low, which is relatively small voice. However, with the level of production technology progresses, the buzzer of the characteristics of the two has become increasingly blurred.
First, the buzzer sound pressure output increasing, people have begun to direct it as a voice of alarm devices to use. This was followed by the sound frequency response to the relatively wide buzzer has been gradually developed, the buzzer sounds more and more abundant, such as e-card using the buzzer. There are also mobile phones and notebook computers the buzzer as the use of small speakers. At present, broadband buzzer production technologies are not yet ripe for the development of the world and only a few companies (23) can be produced, domestic enterprises are also active research and development, a small number of companies have developed similar products, the level of performance yet to be Authentication.
Although the buzzer and the speaker (speakers) more and boundaries are fuzzy, but as long as the buzzer to seize the two main characteristics, it is not difficult to distinguish between them.
Finally, talk about the use of the buzzer. Buzzer of a wide range of applications, mainly as a sound of prompts and audible warning device to use. For example, like calculators, mobile phones and other electronic products, sustain and key ring alarm clock, are the scope of audio prompts. And as anti-theft devices, alarm devices voices are warning of the scope of the sound. If you pay attention, this example can be seen everywhere. For example, some people get off buses to remind sustain and prompted the supermarket at the entrance sound the warning of security devices, and use their credit cards when you are prompted to sustain the security device issued a warning tone, and so on.
In addition to these two purposes, issued by the sweet sound of music cards, the phone ringing, sirens, etc., are using the buzzer.
By the way is worth mentioning that the piezoelectric effect due to the existence of the piezoelectric buzzer can also be used as a vibration sensor. It can receive the vibration is converted to electrical signals sent out. At present, many car anti-theft alarm, and are based on the buzz the film as a piezoelectric vibration sensors.
