CASES HIGH DEFINITION OPTICAL DISCS

Brand	Owner	Address	Description
ECO-BOX	ENCORE HOLDINGS LIMITED	BAY STREET KINGS COURT, P.O. BOX N-3944 NASSAU Bahamas	Cases for high-definition optical discs; HD-DVD cases; DVD cases; CD cases; CD/CDR boxes; boxes for high-definition optical discs; DVD boxes; CD-Rom cases; DVD-Rom cases; cake boxes for storage of high-definition optical discs, HD-DVDs, CDs, and DVDs; trays specially adapted for storing and depositing high-definition optical discs, HD-DVDs, CDs, and DVDs; high-definition optical disc sleeves; HD-DVD sleeves; and DVD sleeves;ECOLOGICAL BOX;
	Where the owner name is not linked, that owner no longer owns the brand

Technical Examples

There is provided an objective lens for an optical pick-up which is used to record/reproduce data to/from at least three types of optical discs. Thicknesses t1, t2 and t3 of cover layers of first, second third optical discs are t1?0.6 mm, t2?0.6 mm, and t3?1.2 mm. Numerical apertures NA1, NA2 and NA3 for the first, second and third optical discs satisfy a relationship NA1?NA2>NA3. When the first optical disc is used, a substantially collimated light beam is incident on the objective lens. When the second or third optical disc is used, a diverging beam is incident on the objective lens. With regard to magnifications M1, M2 and M3 and focal lengths f1, f2 and f3 of the objective lens for the first, second and third optical discs, the following conditions (1), (2) and (3) are satisfied: