| 摘要 |
PURPOSE: An eccentricity measuring method is provided to easily obtain eccentricity based on the slope of a shaft generated on an aspherical lens using the eccentricity measuring method on which an autocollimation method is applied. CONSTITUTION: An eccentricity measuring method comprises followings. The relative slope of a shaft of a surface to be measured is measured based on each light incident from a light source(S3). Eccentricity(Ecx,Ecy) according to the relative slope of the shaft is produced based on the measurement result(S4). A base plate is rotated around a shaft after the optical member to be tested is installed on the base plate. The whole eccentricity(Ex,Ey) is produced from the radius of a circle(S5). The eccentricity according to the relative slope of the shaft is reduced from the whole eccentricity(S6).
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