Lens mold and method of manufacturing a lens

Details Lens mold and method of manufacturing a lens Lens mold and method of manufacturing a lens

1998-07-27

1999-11-23

Vincent, Sean

Glass manufacturing

Processes

Reshaping or surface deformation of glass preform

65 37, 65 39, 65 64, 264 132, 264 25, 264 27, 425233, 425808, C03B 1100

Patent

active

059879246

ABSTRACT:
A lens device which can be used as an objective lens in an optical pickup apparatus includes an objective lens provided along a light path facing a disc and having a predetermined effective diameter, and light controlling means provided along the light path for controlling the light in an intermediate region between near and far axes of an incident light beam, thus providing a simplified and inexpensive device for using discs of differing thickness in a single disc drive, by reducing the spherical aberration effect.

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Y. Komma et al., "Dual Focus Optical Head for 0.6 mm and 1.2 mm Disks," Optical Review, vol. 1, No. 1, Accepted Jul. 22, 1994, pp. 27-29.

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