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The difference between the touch switch and the key switch

In fact, with self-locking switch and touch switch is from different aspects to describe the switch performance; "self-locking" means that the switch can maintain a certain state through the lock mechanism (through or off), "touch" is used to explain the use of the switch Strength size.

   In general, mechanical switches may be distinguished:
The switch is operated from the operating mode, the knob type, the board type (including the button switch, the boat switch), the button type; which knob type and the board type switch can be maintained after the operation (lock) in the connected or disconnected state , Such as the daily use of the light switch, fan speed switch, most of these switches do not have to emphasize whether with self-locking, because there are obvious "operating direction"; only button-type switch, the use of all press, most button switch It is sometimes used as the "bell switch", the button switch in order to achieve to maintain the "has been pressed" state, and the same as the ordinary switch, only to increase the state, Self-locking device, the use of self-locking performance, so that the same can remain open or disconnected state, which is a self-locking switch, which, for a need, a few switches in the work only one of them State, the rest must be disconnected, there are several button switches side by side combination, and use the "interlock mechanism", allowing only one of the switches in the connection lock state, when the press another When a switch is locked, but the original lock switch is released (e.g., "play, fast forward, rewind" button on mechanical tape recorder). These switches, contacts can be one or more groups; locking mechanism is also a variety of applications, which is more use of a spring hook along a heart groove sliding, heart-shaped groove of the two corresponding to the lock lock and release position.

As the name suggests, "touch" is not much power contact can change the state of the switch contacts, so the contact capacity is very small, and the structure is simple, switching power can only be retained after the original state, that is, a very Small force switch can be considered touch switch, the structure of the majority of the use of two mutually insulated film printed on the conductive line, by pressing the button, the switch can not be locked, So that the lines connected to each other; or the use of thin elastic metal butterfly shrapnel, press the shrapnel to make the printed circuit connection.
Electric cooker, electric kettle on the switch, after being locked, but heated to the specified conditions, the lock switch state of the magnet or bimetal action, so that the switch reset at the same time cut off the power (rice cooker is converted to the insulation state) , Perhaps not "reset after power" requirement.

After the power is turned off, that is, the locking mechanism should be operated on the power supply, the finished product seems to have no, because the request can use the general push button switch and relay circuit can be achieved; but if only one relay (or contactor) The group normally open contact is used to control the power supply of the relay (contactor) working coil, the relay value iron as the switch button, press the iron, the relay control coil contacts closed, the coil was energized, the relay to keep the pull ( Self-locking), the rest of the control to control other lines; when the power supply, the relay then power off, value iron reset, a considerable button reset, you need to press the relay again iron, the power can be connected again. This relay is quite a live lock at this time.
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 switch.