Patent ID: 9297980
Filing Date: 2016-03-29
CPC Classification: G01N,G02B

Claim Text:
1. An optical device comprising: a laser source; a beam scanning mechanism configured to move a scanning laser beam emitted from the laser source; a stage configured to hold an observation sample; an objective lens configured to focus the laser beam output from the beam scanning mechanism onto the observation sample held on the stage; condenser optics provided on a light-transmission side of the stage; a reflection plate; a condenser lens configured to focus a light beam returning back from the beam scanning mechanism; an aperture arranged at a focal position of the condenser lens; a photodetector configured to detect a light beam that has passed through the aperture; an electronic device configured to store a signal of the photodetector in association with a scanning position; and a display device configured to display the signal stored in the electronic device; optics configured to detect a part of the light beam returning back from the beam scanning mechanism to detect a focus error; an actuator configured to drive a lens of the condenser optics or the reflection plate in an optical-axis direction using a signal of the detected focus error another scanning mechanism including another actuator configured to move another lens arranged between the objective lens and the laser source in the optical-axis direction, wherein the electronic device generates instructions based on the detected focus error and sends the instructions to the actuator and to the another actuator to position the reflection plate at a focal position of the condenser optics.