IMAGE PICKING-UP DEVICE FOR LENS

摘要

A half-mirror (35) reflects light (L) from a light source, a collimator lens (36) converts the reflected light into parallel light (L1), and the parallel light passes through a lens (1) to be examined. A corner cube prism (49) provided at a rotation reflector (43) recursively reflects the light (L1) passing through the lens (1). When the recursively reflected light (L2) passes through only a non-mark portion of the lens (1), the reflected light diffuses so little that the recursively reflected light becomes a light flux with a small diameter. Because of this, no light loss occurs through an aperture stop (37), and when the light is collected on a CCD (40A), a luminous image is formed. The light (L3) passing through a mark (3C) of the lens (L) so widely diffuses that the light becomes diverged reflection light with a large light flux diameter and a large light loss occurs through the aperture stop (37). Because of this, when the light is collected on the CCD (40A), a dark mark image with low illuminance is formed.