Patent ID: 6421192
Filing Date: 2002-07-16
Classification: G02B

Abstract:
A bayonet type fixing device comprising:a cylindrical member; an annular member attached to one end of said cylindrical member so as not to rotate relative to said cylindrical member; and a retainer ring attached to said cylindrical member to fix said annular member to said cylindrical member, wherein said cylindrical member comprises: a plurality of engaging lugs formed at said one end of said cylindrical member to extend radially along a circumference of said cylindrical member; a plurality of insertion areas formed at said one end of said cylindrical member so that said insertion areas and said engaging lugs are alternately arranged along said circumference of said cylindrical member; a plurality of grooves formed behind said engaging lugs, to be connected to said insertion areas, respectively; and a plurality of recesses formed behind said grooves, to be connected with said grooves, respectively, wherein said annular member comprises a plurality of projections which are respectively fitted into said recesses via said insertion areas and said grooves, and wherein said retainer ring comprises a plurality of engaging blades which are fitted into said grooves via said insertion areas to be positioned between said engaging lugs and said projections in an axial direction of said cylindrical member, respectively.