Patent ID: 6619806
Filing Date: 2003-09-16
Classification: G02B

Abstract:
A shielding device that shields a clearance between a frame member having an opening and a tube member which is received in said opening and movable substantially in a direction of an optical axis, comprising:an annular shielding member arranged between an inner circumference of the opening of said frame member and an outer circumference of said tube member, and a shading member fitted slidably on said tube member so that an inner circumference portion of said shading member contacts with the outer circumference portion of said tube member, and deformable at least radially with respect to said tube member, wherein: said annular shielding member is slidably fitted on said tube member so that an inner circumference of said annular shielding member contacts with an outer circumference portion of said tube member, said shielding member is either given substantially a same color as a color of a surface of the outer circumference of said tube member or made substantially transparent at least at a portion of the shielding member that contacts with said tube member, said shielding member is fixed at an outer circumference portion of said shielding member in said frame member, and a contact pressure of said shading member to contact with said tube member is lower than a contact pressure of said shielding number to contact with said tube member.