Terminal substrate for a quartz vibrating device

A quartz vibrating device comprising:

• a terminal substrate having an electrically insulating substrate member having a through-hole therethrough, and a pair of conductors attached on one surface thereof in spaced relation to each other, a quartz vibrating element having a quartz crystal element having a pair of opposed main electrodes attached on opposite major surfaces thereof, and a pair of lead electrodes electrically connected to the respective ones of said pair of main electrodes, said lead electrodes being positioned in positions other than opposed to each other on said quartz crystal element;
• and the ratio between said through-hole area to said electrode area being from 0.5 to 0.8, said quartz vibrating element being mounted and closely contacted with on said terminal substrate with one of said main electrodes facing said through-hole in said terminal substrate, and said pair of lead electrodes being conductively fixed to the respective pair of conductors on said terminal substate, the connections of said lead electrodes and said conductors constituting the only support for said quartz vibrating element on said terminal substrate, whereby said terminal substrate and said quartz vibrating element are integrally connected, and the range of the fine-frequency adjustment by using said through-hole with the evaporation being from zero to 0.8 percent for the frequency before said evaporation.