Self-locking metal pushbutton switch generally refers to the switch comes with mechanical locking function, press down, after the push button is not completely jumped up, in a locked state, you need to press it again, to unlock completely jump. It is called self-locking metal push button switch. The early direct complete power off the TV, the monitor is to use this switch.
The difference between a self-locking metal pushbutton switch and an ordinary self-locking pushbutton switch is that the illuminated switch takes full advantage of the space in its pushbutton to house a small pilot light bulb or LED with one end connected to the neutral and the other end generally passed A step-down resistor is connected in parallel with the normally open contact of the switch. When the switch is closed, the device operates and provides power to the indicator light. The type of diagonal switch at the same time, the parallel switch at the same time, by leaps and bounds simultaneously switch.
Actually with self-locking metal pushbutton switch and metal touch switch is different from the description of the switch performance; "self-locking" refers to the switch through the locking mechanism to maintain a certain state (on or off), "touch" is to explain the operation Switch the size of the power used.
Mechanical switches in general may be able to distinguish between:
Switch from the mode of operation sub-knob, plate-type (including the push button switch, boat switch), button type; which knob and plate-type switch can be maintained (locked) in the operation of the on or off state , Such as the daily use of light switch, fan speed switch, most of these switches do not have to emphasize whether the self-locking, because there are obvious "direction of operation"; only the push button switch, use are pressed, most of the buttons The switches are used to turn on or off the circuit when pressed, the state is restored after being released, so it is sometimes called the "bell switch". In order to achieve the state of being "pressed down", the pushbutton switch is the same as the ordinary button switch, Only add a self-locking device, the use of self-locking performance, so that it can also be kept on or off, which is with a self-locking switch, which, for some needs, the number of switches in the work allows only one In the connected state, the rest must be disconnected, there will be a number of button switch side by side combination, and the use of "interlock mechanism" to allow only one of the switch is connected to lock the state, when pressed When a switch, the switch is locked, but the original lock push switch is released (e.g., "play, fast forward, rewind" button on mechanical tape recorder). These switches and contacts can be one or more sets. There are many kinds of locking mechanisms. One of the more widely used is a spring hook sliding along a heart-shaped slot. The two sharp points of the heart-shaped slot correspond to the locking and releasing positions of the switches.
As the name implies, "touch" means that the contact state of the switch can be changed without much power contact, so the contact capacity is small and the structure is simple. Only after the switch power is withdrawn can only be maintained. That is to say, At present, the membrane switch and the small micro switch can be regarded as the touch switch. Most of the structures are printed with conductive lines on two mutually insulated films, and by pressing So that the lines connected to each other; or the use of thin elastic metal butterfly leaf shrapnel, press the shrapnel to connect the printed circuit.
Electric cooker, electric kettle on the touch switch, press the lock, but heated to the specified conditions, lock the switch state of the magnet or bimetal action, the switch reset at the same time cut off the power (rice cooker is converted to the insulation State), may not meet the "reset after power off" requirement.
Reset after power failure, that is, the locking mechanism should work on the power supply, the finished product does not seem to, because the requirements can be used general button switch and the relay circuit can be achieved; but if only one relay (or contactor) Group normally open contacts used to control the relay (contactor) work coil power supply, the relay balance iron as a switch push button, press the balance iron, the relay control coil contacts closed, the coil is energized, the relay remains snagged Self-locking), the rest of the contact control other lines; when the power is off, the relay then power, balance iron reset, the corresponding button reset, you need to press the relay balance iron again, the power can be switched on again. This relay is quite a push button switch with live lock.
As for the infrared switch, IC card switch, etc., with other components of the switch, is no longer the scope of the mechanical switch can not be regarded as mechanical switch.