An objective lens for recording and/or reproducing an optical information recording medium, comprises a first lens having a positive refractive power; and a second lens having a positive refractive power; wherein the first lens and the second lens are aligned in this order from a light source side of...http://www.google.com.mx/patents/US6876501?utm_source=gb-gplus-sharePatent US6876501 - Objective lens, coupling lens, light converging optical system, and optical pick-up apparatus
