Crystal oscillation device and semiconductor device

A crystal oscillation device, comprising:

• a wiring substrate having an obverse surface, a rear surface opposite the obverse surface, and a plurality of wiring patterns in the wiring substrate,
• the wiring patterns including a first wiring pattern, a second wiring pattern, a third wiring pattern and a fourth wiring pattern,
• the first, second and third wiring patterns formed using an uppermost wiring layer of the wiring substrate, and
• the fourth wiring pattern formed using a wiring layer which is formed between the uppermost wiring layer and the rear surface;
• a semiconductor package having a side surface, first and second external terminals arranged along the side surface, and mounted on the obverse surface of the wiring substrate;
• and
• a quartz crystal unit having a side, first and second electrodes disposed along the side, and mounted on the obverse surface of the wiring substrate such that the side faces the side surface of the semiconductor package,
• wherein each of the first and second wiring patterns have a respective one end portion and a respective other end portion, and extend from the side surface of the semiconductor package to the side of the quartz crystal unit respectively,
• wherein the one end portions of the first and second wiring patterns of the wiring substrate are electrically connected with the first and second external terminals of the semiconductor package respectively,
• wherein the other end portions of the first and second wiring patterns of the wiring substrate are electrically connected with the first and second electrodes of the quartz crystal unit respectively,
• wherein the third wiring pattern has a first portion extending in a first direction along the side surface of the semiconductor package and second portions extending from the first portion toward the side surface of the semiconductor package,
• wherein the third wiring pattern surrounds the first and second wiring patterns and the quartz crystal in a plan view, and
• wherein the fourth wiring pattern overlaps with the first, second and third wiring patterns and the quartz crystal unit in the plan view.