Patent ID: 6657728
Filing Date: 2003-12-02
Classification: G01B

Abstract:
A two-beam interference objective device used to analyze a sample, comprising:an objective lens; an optical path dividing member provided between the objective lens and a sample to divide a light beam into first and second light beams transitting a first light path and a second light path respectively; a reference mirror provided in the first light path; and a tilting device for tilting the reference mirror to adjust width and direction of interference fringes generated by the first light beam reflected by the reference mirror and the second light beam reflected by the sample disposed in the second light path, the tilting device comprising: a width adjuster for pivotally moving the reference mirror around an axis parallel to an optical axis of the objective lens while keeping an approximately constant distance from the optical axis of the objective lens to the reference mirror; and a direction adjuster for turning the reference mirror around the first light path, the width adjuster and the direction adjuster each being manipulatable without altering a setting set by the other.