Patent ID: 6407975
Filing Date: 2002-06-18
Classification: B82Y,G11B

Abstract:
An optical disk drive, comprising:two object optical systems; two carriages which respectively carry one of said two object optical systems, and which are movable along surfaces of an optical disk; an optical unit, separate from said two carriages, which includes a laser source module which emits a luminous beam and a galvano mirror which is rotated to change an incident direction of said luminous beam on a selected one of said two object optical systems; and a beam path selection system that selectively moves a movable mirror so that said luminous beam from said laser source module is introduced to one of said two object optical systems, said beam path selecting system reflecting said luminous beam to one of said two object optical systems to be on a parallel but non-coaxial beam path with a beam path to the other one of said two object optical systems; wherein said movable mirror is moved so that said luminous beam from said laser source module, that is reflected by said galvano mirror, is incident on one of said two object optical systems substantially at the same position regardless of a rotation amount of said galvano mirror.