Patent ID: 8779652

Claim:
An AT-cut quartz-crystal vibrating piece, having a longitudinal-axis direction denoted as an X-axis direction, a thickness direction denoted as a Y′-axis direction, and a short axis direction denoted as a Z′-axis direction, the vibrating piece comprising: a quartz-crystal vibrating portion that vibrates when electrically energized, the vibrating portion having an X-axis dimension and a Z′-axis dimension; a frame portion surrounding the vibrating portion; and a through-slot defined between the vibrating portion and the frame portion, the through-slot extending thickness-wise through the vibrating piece in the Y′-axis direction, wherein the through-slot includes a first through-slot extending in the X-axis direction along a +Z-edge of the vibrating portion and a second through-slot extending in the X-axis direction along a −Z′-edge of the vibrating portion; the first and second through-holes have respective minimum widths in the Z′-axis direction; and the minimum width of the first through-slot is different from the minimum width of the second through-slot.