Patent ID: 11878367
Assignee: CANON KABUSHIKI KAISHA
Field: Machine tools (Mechanical engineering)
Classification: CPC B  G | IPC B  G

Claim 10:
11. An optical device which processes a subject by irradiating the subject with laser light, comprising:
a focal position adjustment mechanism configured to adjust a focal position of the laser light;
an incident position adjustment mechanism configured to adjust an incident position of the laser light incident on the subject in a direction perpendicular to a focal direction of the laser light;
a control unit configured to control driving of the focal position adjustment mechanism and the incident position adjustment mechanism; and
a detection unit configured to detect reflected light from the subject irradiated with the laser light,
wherein the control unit controls the driving of the incident position adjustment mechanism based on an amount of driving of the focal position adjustment mechanism so as to correct a shift of the incident position due to a change of the focal position,
wherein the control unit controls the driving of the focal position adjustment mechanism based on an amount of light of the reflected light to be detected by the detection unit, and
wherein the detection unit detects light using a confocal optical system.