There is a hole in the middle of the snap dome designed for applications that require backlight switches and clear tactile feedback. The hole in the center of the dome allows the LED to be placed directly behind the dome switch instead of on the side. The result is a stronger lighting effect.
This series of tactile snap dome can be installed on single-sided or double-sided printed circuit boards, flexible circuits or films.
Four-legged metal dome: When designers reserve enough space and require greater travel, this series of metal domes will be preferred. It is usually used in handheld devices, medical equipment and large banking equipment.
MYLAR + SPACER + DOME
3. Metal Dome
4. Product film