Confocal optical system aperture position detection method confocal optical system aperture position detection device, a confocal optical system aperture position control device, optical head device, and optical information processing apparatus

摘要

And a plurality of absorption regions, the detector and the second confocal optical system and a detector 18 and light source 13, the opening 17 and the condenser means 14 first, and the focusing means 16 of the second and detects the position shift can be detected by the detector 18 the intensity distribution of the image caused by positional shift between the opening 17 and the focusing spot of the condensing means 16, to control the opening position by 20 the control means and the drive means 19 I want to correct the positional deviation by. It also swings in the direction of the optical axis aperture 17, and to detect and correct the positional deviation of the optical axis direction of the opening 17 on the basis of the change in the output of the detector 18.