An Optical Head with Special Annular Lens for Laser Disc-Compatible Digital Versatile Disc Pickup

概要

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A compact and inexpensive design for a laser disc(LD)-compatible digital versatile disc(DVD) pickup that uses a special annular lens is presented and the measurement technique of the lens is described. One objective lens having a special annular area functions as an aberration-corrected lens for reading LD, compact disc recordable(CDR) and DVD regardless of differences in substrate thickness. The special area has an aspherical surface optimized for a thick substrate. This lens can also be used for compact disc rewritable(CDRW).
Publication Office, Japanese Journal of Applied Physics, Faculty of Science, University of Tokyoの論文
1998-04-30