Patent ID: 7706083
Filing Date: 2010-04-27
Classification: G02B,Y10T

Abstract:
1. A drive mechanism comprising: a movable element which has at least one bearing arm; a linear guide shaft for linearly guiding said movable element without rotating; a driving device which drives said movable element linearly along said linear guide shaft; a driven member which is driven, by said driving device, in a direction parallel to said linear guide shaft; a first guide hole formed on said bearing arm; a second guide hole formed on said driven member, said first guide hole and said second guide hole being identical in size and in cross sectional shape; a tubular bearing member fitted into said first guide hole and said second guide hole, said linear guide shaft being fitted completely through said tubular bearing member to be freely slidable therein; and a retaining device formed on said tubular bearing member and said driven member to prevent said tubular bearing member from moving relative to said driven member, wherein said retaining device comprises: a contacting portion, formed on said tubular bearing member, which comes in contact with said bearing arm on a side opposite from said driven member; an engaging recess formed on an outer peripheral surface of said tubular bearing member; and a retaining projection formed on said driven member which engages with said engaging recess so that said tubular bearing member is prevented from moving relative to said driven member in said direction of said linear guide shaft.