Lens device, ultraviolet-ray emitting device, and optical disc recording device
AssigneeSony Corporation
InventorsShigeo Kubota, Naoya Eguchi
Life of this patent
Estimating the term…
Abstract
A lens device for focusing a beam of an ultraviolet-ray region, provided with at least one aspherical lens made of synthetic quartz in which an aspherical portion is formed by a coating a fluororesin on a spherical portion of a side polished to a spherical surface; an ultraviolet-ray emitting device provided with a laser beam source emitting a beam in the ultraviolet-ray region and an object lens which has at least one of the above aspherical lenses; and an optical disc recording device provided with a laser beam source emitting a beam in the ultraviolet-ray region, a light intensity modulating means for modulating the intensity of the laser beam emitted from the laser beam source in accordance with a data signal; and the above object lens.
Claims8
A lens device for focusing a beam of an ultraviolet-ray region, provided with at least one aspherical lens made of synthetic quartz in which an aspherical portion is formed by coating a fluororesin on a spherical portion of a side polished to a spherical surface, wherein provision is further made of a spherical lens made of synthetic quartz with one side polished to a spherical surface, located at an image side of said aspherical lens.
Dependencies are inferred from the claim text.