Piezoelectric Vibration Reed, Piezoelectric Vibrator, Oscillator, Electronic Instrument, and Radio Timepiece

A piezoelectric vibration reed, comprising:

• a base portion;
• a first vibrating arm portion and a second vibrating arm portion, each integrally connected with the base portion and extending from the base portion in parallel to each other in a first direction, wherein each of the first and second vibrating arm portions comprise:
• a first groove define along a first section of the vibrating arm portion in the first direction;
• a second groove defined along a second section of the vibrating arm portion in the first direction, wherein the first groove is located between the second groove and an end of the vibrating arm portion coupled with the base portion, and wherein the second groove comprises a reinforcing rib projecting from a bottom surface of the second groove portion and extending from one end of the second groove to another end of the second groove in the first direction.

A piezoelectric vibration reed, comprising:

• a base portion;
• a pair of vibrating arm portions, each integrally connected with the base portion and extending from the base portion in parallel to each other in a first direction, wherein each of the vibrating arm portions comprise:
• a first groove define along a first section of the vibrating arm portion in the first direction;
• a second groove defined along a second section of the vibrating arm portion in the first direction, wherein the first groove is located between the second groove and an end of the vibrating arm portion coupled with the base portion, and wherein the second groove comprises a reinforcing rib projecting from a bottom surface of the second groove portion that separates the second groove into two sections.