US 6,445,517 B1 · Zoom lens barrel

Abstract

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

Claims11

Dependent claims

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.

6 more elements

A guiding mechanism for cylindrical members comprising:

a first cylindrical member and a second cylindrical member which is disposed in the first cylindrical member;
a through groove formed on the first cylindrical member, said through groove having 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;
and
a roller which is fitted in said through groove and is supported on a radial projection provided on the second cylindrical member, said roller being provided with a slip-off prevention portion whose diameter is greater than the opening width of the through groove on the outer diameter side of said first cylindrical member and smaller than the opening width on the inner diameter side thereof.

1 more element

Dependencies are inferred from the claim text.

Zoom lens barrel

Life of this patent

Zoom lens barrel

Life of this patent

Abstract

Claims11