Patent ID: 6445517
Filing Date: 2002-09-03
Classification: G02B

Abstract:
A zoom lens barrel comprising:a through groove which is provided on a first cylindrical member; a radial projection provided on a second cylindrical member which is disposed in the first cylindrical member; and a roller which is supported by the radial projection and is fitted in the through groove; wherein said through groove formed on the first cylindrical member has an opening width on the inner diameter side of the first cylindrical member which is greater than the opening width on the outer diameter side thereof; said roller is provided with an slip-off prevention portion whose diameter is greater than said opening width of the through groove on said outer diameter side, but smaller than said opening width on said inner diameter side; and said through groove is provided with a large width portion at which the roller is fitted in the through groove from the outside of the first cylindrical member, so that the slip-off prevention portion is located in the through groove.