■Difference between alternate type and momentary type
This is explained in the following diagram.
(1) is called a momentary switch, and the state is ON only while the switch is being pressed.
(2) is called an alternate switch, and its pressed state remains even after you release your finger.
(3) is also an alternate type; when you release your finger, the switch returns to its original position, but continues in that state.
Since the switch mechanism operates momentarily, some people call it a momentary type.
However, it seems common to distinguish between alternate and momentary switches based on how the ON/OFF state transitions.
With this type, if you are not sure whether the current state is ON or OFF, you will need to take some action, such as lighting up the switch.
With a TV remote control, it is clear whether the power is ON or OFF when you look at the TV screen, so there is no need to take measures such as lighting up a button.
■What is a toggle switch?
A toggle switch has the following shape. You can imagine them being installed in large numbers in airplane cockpits.
Toggle switches also come in alternate and momentary types.
＜Electronic Toggle Switches/Toggle Buttons＞
Below is an electronic toggle switch, which can be found on smartphones and other devices. Its appearance is reminiscent of a mechanical toggle switch.
The following may also be called toggle switches/buttons. I personally think this should be called an alternate push button, not a toggle switch.
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