| 摘要 |
PROBLEM TO BE SOLVED: To provide a double refraction measuring method and device capable of providing an image having little effect of optical distortion and transmitted through a lens under test, performing accurate double refraction measurement overt the whole surface of the lens, facilitating the change of kinds of lens and improving the flexibility. SOLUTION: This method and device comprise an illumination optical system 2 for applying divergent light in a given polarized state to a lens 1 under test, a light applying side displacement means 11 for adjusting a position of the illumination optical system 2 to the lens 1 in the optical-axis direction, a polarizing element 15 for changing a polarized state of the transmitted light from the lens 1, a rotating means 21 for rotating the polarizing element 15 almost in the direction of the transmitted light, a rotation angle detecting means 25 for detecting a rotation angle of the polarizing element 15, an array type photodetector 12 for receiving the light transmitted through the polarizing element 15, an image focusing optical system 13 for focusing the light transmitted through the polarizing element 15 on the photodetector 12, and a computing means 23 for computing a double refraction of the lens 1 on the basis of the rotation angle detected and a light receiving output being detected by the photodetector 12.
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