LENS, ITS MANUFACTURE, AND OPTICAL PICKUP

摘要

PROBLEM TO BE SOLVED: To provide a lens which can be formed accurately in shape and which can be manufactured efficiently at a low cost, as well as its production method and an optical pickup. SOLUTION: The device is provided with a geometrical optical part 20 for converging the light made incident from an incident plane 20a, and a diffraction optical part 21 which is formed on the incident plane 20a and the exiting plane of the geometrical optical part 20 and which is for further converging the light from the geometrical optical part 20; the diffraction optical part 21 is constituted of a lens 14 which is formed by joining resin to the incident plane 20a and the exiting plane 20b of the geometrical optical part 20.