Patent ID: 7764145

Claim:
A piezoelectric resonator comprising: a base; a vibrating arm extended from the base in a longitudinal direction to a tip portion and the arm extending in a width direction orthogonal to the longitudinal direction; a metal film for adjusting frequency formed at the tip portion of the vibrating arm; said metal film for adjusting frequency being provided with: a first block pattern comprised of a plurality of first blocks each having a first area such that the first blocks are equal to each other in area and arranged adjacent each other in the width direction; and a second block pattern provided displaced from the first block pattern in the longitudinal direction, the second block pattern being comprised of a plurality of second blocks each having a second area such that the second blocks are equal to each other in area and are arranged adjacent each other in the width direction, said second area being different in size from said first area; and said first blocks are spaced apart from each other and said second blocks are spaced apart from each other a distance sufficient to permit removal of one of either of said first and second blocks by laser operation without affecting an adjacent one of said first and second blocks.