Patent ID: 8513746

Claim:
A capacitance type gyro sensor comprising: a semiconductor substrate having a cavity inside by forming an upper wall and a bottom wall, and having a surface portion forming the upper wall of the cavity and a back surface portion forming the bottom wall; a first electrode formed by processing the surface portion of the semiconductor substrate, and integrally having a first base portion and first comb tooth portions extending from the first base portion and aligned at intervals like comb teeth; and a second electrode formed by processing the surface portion of the semiconductor substrate, and integrally having a second base portion and second comb tooth portions extending from the second base portion toward the portions between the first comb tooth portions and aligned like comb teeth to engage with the first comb tooth portions at an interval, where the first electrode or the second electrode are driven up and down with respect to the other electrode and an angular velocity applied at the time of this driving is detected by detecting a change in capacitance between the first comb tooth portion and the second comb tooth portion, wherein the first electrode includes first drive portions extending from opposed portions opposed to the second comb tooth portions of the first base portion toward the second comb tooth portions, and electrically insulated from other portions of the first base portion, the second electrode includes second drive portions formed on the tip end portions of the second comb tooth portions opposed to the first drive portions so as to be electrically insulated from other portions of the second comb tooth portions, and the first drive portions and the second drive portions engage with each other at an interval like comb teeth.