In the case of the PKM13EPYH series, the pins are formed to specified dimensions and
are fixed to the rear cover. The springiness of the pins is utilized by pressing the end of each pin
against the piezoelectric diaphragm to ensure reliable electrical contact.
The fixing point of each pin is made of plastic.
In the case where the product is mounted on a two-sided through-hole board, and then
soldered in place, the molten solder will flow through the through-hole and reach the rear cover. Due to
the heat of the molten solder, the possibility of deformation of the rear cover and the pins' fixing
points will increase.
If the fixing points of the pins becomes loose, as a result of deformation, the pins will move and lose
their springiness preventing them from being pressed firmly against the diaphragm.