Lens for optical pick-up and optical pick-up for optical disc drive

Abstract

A lens for an optical pick-up formed by injection molding, the lens including a lens body having a first surface on an optical disc side and a second surface on a light source side, and a flange part formed to protrude from a periphery of the lens body outward in a radial direction of the lens body, and wherein a part of the flange part has been cut off along a cylindrical outer circumferential surface of the flange part to remove a gate part of the lens, and when D denotes a cutting depth of the flange part, R denotes a radius of the lens and WG denotes a width of the gate part, the lens satisfies a condition: D < R - R 2 - ( W G 2 ) 2 .

Dependencies are inferred from the claim text.