Patent ID: 8094371
Filing Date: 2012-01-10
Classification: G02B

Abstract:
1. A microscope comprising: a first phase-contrast objective which includes a first phase film shaped like a ring and which has a 20-fold magnification or lower; a second phase-contrast objective which includes a second phase film shaped like a ring and which has a 100-fold magnification or higher; and a ring slit shared and used by the first and second phase-contrast objectives; wherein: the first phase film is placed at a pupil position of the first phase-contrast objective, and changes a phase of a laser beam by ¼ wavelength; the second phase film is placed at a pupil position of the second phase-contrast objective, and changes a phase of a laser beam by ¼ wavelength; when the first phase-contrast objective is used, the ring slit is placed at a position conjugate to the first phase film; when the second phase-contrast objective is used, the ring slit is placed at a position conjugate to the second phase film; and the following conditional expression is satisfied: where OB