BEAM SHAPING LENS, LENS PART, MOUNTING PLATE, OPTICAL HEAD, OPTICAL INFORMATION RECORDING AND REPRODUCING APPARATUS, COMPUTER, IMAGE RECORDING AND REPRODUCING APPARATUS, IMAGE REPRODUCING APPARATUS, SERVER, AND CAR NAVIGATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To solve problems that an optical head capable of corresponding to high double-speed recording, a two-layer disk, etc. by improving the application efficiency of light is required and it is necessary to improve shaping magnification, suppress high-order aberration and stabilize the shaping magnification and the aberration in a beam shaping lens or the like.;SOLUTION: A beam shaping lens 2 for shaping an incident beam having an elliptic cross section into an outgoing beam having a substantially circular cross section comprises a first plane 2i which is a cylindrical surface having a generating line curving to form a non-circular cylindrical surface as the incidence side of the incident beam and a second plane 2o which is a circular cylindrical surface as the outgoing side of the outgoing beam. The distance between both the ends of the generating line of the circular cylindrical surface is larger than the distance between both the ends of the generating line of the non-circular cylindrical surface.;COPYRIGHT: (C)2006,JPO&NCIPI