Abstract
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).
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