Patent ID: 6285484
Filing Date: 2001-09-04
Classification: G11B

Abstract:
A galvano mirror system, comprising:a galvano mirror having a mirror surface that reflects light for at least one of data reading and data writing;a mirror holder having a front portion to which said galvano mirror is mounted, and a rear portion opposing said front portion;a stator that rotatably supports said holder;a first reflecting surface;a second reflecting surface, said first reflecting surface and said second reflecting surface being associated with said rear portion of said mirror holder;a first photo sensor;a second photo sensor, said first photo sensor and said second photo sensor being associated with said stator, such that said first photo sensor faces said first reflecting surface and said second photo sensor faces said second reflecting surface, said first photo sensor and said second photo sensor each comprising a light-emitting device and a light-receiving device;a controller that deflects a rotation of said mirror holder according to a difference in output between said light-receiving device of said first photo sensor and said light-receiving device of said second photo sensor, wherein a recess is formed at said rear portion of said mirror holder, said first reflecting surface and said second reflecting surface being formed on both sides of said recess.