LENS BARREL DEVICE FOR OPTICAL EQUIPMENT

PURPOSE:To reduce the working cost by arranging helicoid screw dowels along the prolongation of the lead of a helicoid screw so that the helicoid screw has a gap on the periphery. CONSTITUTION:A female helicoid cylinder 3 has a screw part 3a on its outer periphery and is engaged with a fixed lens barrel 1 and a helicoid screw part 3b which has the opposite screw direction from the screw direction of the screw part 3a is formed on its inner periphery. The helicoid screw dowels 5 which are provided to a male helicoid cylinder 4 at specific intervals are engaged threadably with the helicoid screw part 3b. Then the helicoid screw dowels 5 has a screw along the prolongation of the lead of the helicoid screw so that a series of helicoid screws are formed when the helicoid screw is divided into many parts on the periphery and arranged at specific intervals on the periphery. Consequently, the degree of freedom of working is obtained and the productivity is good in structure.