Piezoelectric vibrating gyro element and gyro sensor

A piezoelectric vibrating gyro element constructed of a piezoelectric crystal material comprising at least in the same plane:

• a base portion having opposite sides and ends respectively;
• a pair of vibrating arms for detection extending out from the opposite ends of said base portion in a straight line;
• a weight portion connected to a tip of each of the vibrating arms for detection;
• a pair of connecting arms extending out from each side of the base portion in directions perpendicular to the vibrating arms for detection;
• additional pairs of vibrating arms for driving with each pair extending out from a tip portion of each of the connecting arms in a direction perpendicular to the tip portion;
• and
• a weight portion connected to the tip portion of each of the vibrating arms for driving;
• wherein, when each vibrating arm for driving is set to Ld in length and Wd in width, and each additional vibrating arm for detection is set to Lp in length and Wp in width, and said connecting arms are set to Lc in length and Wc in width, the piezoelectric vibrating gyro element is constructed to conform in relationship to the following formulas:
• 90≦Wd/Ld2≦540
• 135≦Wp/Lp2≦790
• 65≦Wc/Lc2≦380.

A piezoelectric vibrating gyro element constructed of a piezoelectric crystal material comprising at least in the same plane:

• a base portion having a given length with opposite sides and ends respectively;
• a pair of vibrating arms for detection extending out from the opposite ends of said base portion in a straight line, and having groove portions of lengths of about half the length of the base portion;
• a pair of connecting arms extending out from each side of the base portion in directions perpendicular to the vibrating arms for detection;
• and
• additional pairs of vibrating arms for driving with each pair extending out from a tip portion of each of the connecting arms in a direction perpendicular to the tip portion with each tip portion having a given length and with the additional pairs of vibrating arms having groove portions of lengths of about half the length of the tip portion;
• wherein, when each vibrating arm for driving is set to Ld in length and Wd in width, and each additional vibrating arm for detection is set to Lp in length and Wp in width, and said connecting arms are set to Lc in length and Wc in width, the piezoelectric vibrating gyro element is constructed to conform in relationship to the following formulas:
• 22≦Wd/Ld2≦125
• 23≦Wp/Lp2≦135
• 37Wc/Lc2≦215.

A piezoelectric vibrating gyro element constructed of a piezoelectric crystal material comprising at least in the same plane:

• a base portion having a given length with opposite sides and ends respectively;
• a pair of vibrating arms for detection extending out from the opposite ends of said base portion in a straight line, and having groove portions extended to a tip portion;
• a pair of connecting arms extending out from each side of the base portion in directions perpendicular to the vibrating arms for detection;
• and
• additional pairs of vibrating arms for driving with each pair extending out from a tip portion of each of the connecting arms in a direction perpendicular to the tip portion;
• and
• wherein, when each vibrating arm for driving is set to Ld in length and Wd in width, and each additional vibrating arm for detection is set to Lp in length and Wp in width, and said connecting arms are set to Lc in length and We in width, the piezoelectric vibrating gyro element is constructed to conform in relationship to the following formulas:
• 18≦Wd/Ld2≦105
• 20≦Wp/Lp2≦115
• 32≦Wc/Lc2≦185.

A piezoelectric vibrating gyro element constructed of a piezoelectric crystal material comprising at least in the same plane:

• a base portion having opposite sides and ends respectively;
• a pair of vibrating arms for detection extending out from the opposite ends of said base portion in a straight line;
• a pair of connecting arms extending out from each side of the base portion in directions perpendicular to the vibrating arms for detection;
• and
• additional pairs of vibrating arms for driving with each pair extending out from a tip portion of each of the connecting arms in a direction perpendicular to the tip portion;
• and
• wherein, when each vibrating arm for driving is set to Ld in length and Wd in width, and each additional vibrating arm for detection is set to Lp in length and Wp in width, and said connecting arms are set to Lc in length and Wc in width, the piezoelectric vibrating gyro element is constructed to conform in relationship to the following formulas:
• 20≦Wd/Ld2≦120
• 23≦Wp/Lp2≦135
• 37≦Wc/Lc2≦215.