Surface mounting crystal unit

A surface mounting crystal unit comprising:

• a quartz plate;
• a terminal member resembling a receptacle and holding the quartz plate inserted from an opening thereof so as to be able to oscillate the quartz plate therein, said terminal member having quartz plate fixture mounts, one of said quartz plate fixture mounts disposed on each of two ends of said terminal member, said quartz plate fixture mounts having electrode pads;
• and
• a lid covering the opening of the terminal member,
• said quartz plate being formed in the shape of a rectangular parallelepiped by cutting in the direction of an AT cut relative to a crystallographic axis and disposed such that one or both of shorter sides thereof at the opposite longitudinal ends are fixedly attached on one or both of the quartz plate fixture mounts in said terminal member by use of one of a silicone-based, urethane-based, or polymide-based electrically conductive adhesive of high plasticity,
• said quartz plate having electrodes formed in regions where the quartz plate is fixedly attached to the electrode pads of one or both of the quartz plate fixture mounts, said electrodes being provided with non-electrode portions each formed in the shape of a square or circle in the middle part or on the edge thereof so that the quartz plate is fixedly attached to one or both of the quartz plate fixture mounts by adhering said electrically conductive adhesive between the quartz plate and the quartz plate fixture mounts, at both of said electrodes and the non-electrode portions, and
• said lid being airtightly bonded to the opening of the terminal member with use of a solder composed of one of an alloy made of gold and tin, an alloy made of lead, silver, and tin, or an alloy made of lead and tin, the terminal member airtighly sealed being vacuumized.