Patent ID: 6439727
Filing Date: 2002-08-27
Classification: G02B

Abstract:
A telescope, comprising:a barrier member movable to a position of protection at which it protects a front surface of an optical system incorporated in a lens barrel or a position of withdrawal at which it has withdrawn from the front surface of said optical system; a slide member for supporting said barrier member so that said barrier member can pivot freely; an optical system thrusting means for thrusting and moving said lens barrel from a position of non-use to a position of use; a first constraining means for constraining said barrier member to move in a direction of closing; and a second constraining means for constraining said slide member to move in a direction substantially opposite to said direction in which said lens barrel is thrust, wherein said barrier member pivots by a predetermined magnitude in a direction towards the position of withdrawal in opposition to said first constraining means when pressed by said lens barrel; and said slide member is moved by means of said second constraining means.