Patent ID: 8465708
Filing Date: 2013-06-18
Classification: G02B,Y10T

Abstract:
1. An immersion objective lens for use in a device which maintains the immersion medium between a sample and a tip portion of the immersion objective lens and observes/measures the sample via the immersion medium, wherein the immersion medium is brought into contact with the tip portion of the immersion objective lens and maintained, the immersion objective lens being formed of the tip portion, a lens ring portion and a lens outer frame, the lens ring portion being formed of an entire surface inclined from the lens of the tip portion to the lens outer frame, the immersion objective lens comprising a retention mechanism for an immersion medium comprising a first ring-member as a region surface-processed with a material for retaining the immersion medium so as to surround the lens in a region including the tip portion and the lens ring portion of the immersion objective lens, an affinity of the first ring-member with the immersion medium being lower than an affinity of a region connected to an inner side of the surface-processed region with the immersion medium.