Patent ID: 8167443
Filing Date: 2012-05-01
Classification: G02B

Abstract:
1. An optical observation apparatus comprising: an ocular optical system; a supporting member disposed at an outer circumference of the ocular optical system; and an eyepiece cup disposed at an outer circumference of the supporting member, the eyepiece cup being rotatable around an optical axis of the ocular optical system and movable in a direction of the optical axis with respect to the supporting member, wherein, when one of the supporting member and the eyepiece cup is referred to as a first member and another thereof is referred to as a second member, the first member includes a cam follower portion, and the second member includes (a) a cam groove portion engaging with the cam follower portion to move the eyepiece cup in the direction of the optical axis with rotation of the eyepiece cup and (b) an introducing groove portion through which the cam follower portion is introduced to the cam groove portion with rotation of the eyepiece cup when the eyepiece cup is assembled to the supporting member, wherein one member of the first and second members includes an engaging portion, and another member thereof includes a stopper engaging with the engaging portion to prevent rotation of the eyepiece cup in a direction in which the cam follower portion is returned from the cam groove portion toward the introducing groove portion, wherein the stopper is formed integrally with another member and elastically movable so as to be retreated from an engaging position engageable with the engaging portion in a state where the cam follower portion is located in the introducing groove portion and so as to be located at the engaging position in a state where the cam follower portion is located at an introducing groove portion side end area of the cam groove portion.