The difference between self-locking key switch and light tactile switch

Publish Time:2023-01-09 Author:jiaxi Views:944

What is the difference between a self-locking key switch and a tactile switch.

　　The first thing we need to know is that the performance between a self-locking switch and a light-touch switch is not the same and is described in two concepts altogether. Self-locking switches allow us to keep the locking or opening state through the performance of the locking structure, while in the case of light-touch switches, it is the amount of force that is expended when using the switch.

　　At the same time, the light contact switch does not require excessive force to change the state of the switch, the capacity of the contact is still relatively small, and the switch is processed in a simple structure, the power of the switch can only be maintained in the original state after the disappearance of the switch. In other words, when we use the light touch switch, we only need to use a small force to be able to press the switch, the switch button does not need to be locked. In the current market, some membrane switches and small micro-switches belong to the light touch switch, in the structure of the membrane is mostly insulated from each other, through the press can be connected to the internal wiring.

　　Self-locking switches mostly emphasize on the term self-locking, which has a more obvious direction of operation guidance, such as the electric fan speed switch that we use, emphasizing whether it has a self-locking function has a very obvious direction switch, such a switch has a self-locking device and performance, through the self-locking performance can keep themselves disconnected or connected state. For example, the electric cooker switch is a self-locking switch, the use of such a switch can be more secure in our use.

　　In fact, self-locking switches and light touch switches are different aspects to describe the performance of the switch; "self-locking" refers to the switch can be locked by the mechanism to maintain a certain state (on or off), "light touch" is the size of the force used to operate the switch.

　　Generally speaking, mechanical switches may be distinguished as follows.

　　Switches are divided into knob type, plate type (including button switch, boat switch), button type from the operation mode; most of the knob type and plate type switches can be kept (locked) in the on or off state after operation, such as the daily use of light switch, fan speed switch, most of these switches do not need to emphasize whether with self-locking, because they have obvious "operation direction "Most push-button switches are used to turn on or off the circuit when pressed, and the state is restored after release, so they are sometimes called "electric bell switches". In order to achieve the "pressed" state, like ordinary switches, they are equipped with a self-locking device, which makes use of the self-locking property, so that they can also keep themselves connected or disconnected, which is a switch with self-locking, in which, for certain needs, several switches are allowed to work with only one of them in a connected state, and the rest must be disconnected, there are several pushbutton switches combined side by side, and use "Interlocking mechanism", only one of the switches is allowed to be connected to the locked state, when another switch is pressed, the switch is locked, but at the same time the original locked switch is released (such as the tape recorder "play, fast forward, fast rewind" mechanical button). These switches, contacts can be a group or more; locking mechanism is also a variety of applications, including the use of a spring hook along a heart-shaped slot sliding, heart-shaped slot of the two tips corresponding to the lock and release position of the switch.

　　As the name implies, the "light touch" does not have to use much force to change the state of the switch contact, so the contact capacity is very small, and the structure is simple, the switch can only maintain the original state after the withdrawal of force, that is, quite a small force can be pressed, without locking the single contact button switch, at present, the Membrane switches, small micro switch can be considered light touch switch, the structure of most of the two mutually insulating film printed conductive lines, by pressing the lines connected to each other; or the use of thin elastic metal made of butterfly shrapnel, press the shrapnel so that the printed circuit connection.

　　Electric rice cooker, electric kettle on the switch, pressed after being locked, but after heating to the specified conditions, lock the switch state of the magnet or bimetal action, so that the switch reset while cutting off power (rice cooker is converted to the insulation state), perhaps not "reset after power failure" requirements.

　　Reset after power failure, that is, the locking mechanism should work in the power supply, the finished product does not seem to have, because the requirements can use the general button switch and relay circuit can be achieved; but if only use a relay (or contactor), a set of normally open contacts used to control the relay (contactor) work coil power, the relay iron as a switch button, press the iron, the relay control coil Contact closure, the coil is powered, the relay to maintain suction (self-locking), the rest of the contacts control other lines; when once the power is off, the relay then power off, the iron reset, rather than button reset, the need to press the relay iron again, the power can be turned on again. This relay at this time is equivalent to a button switch with power lock.

　　As for the infrared switch, IC card switch, etc., with other components of the switch, is no longer the scope of mechanical switches, can not be considered mechanical switches.