Patent
Wide aperture objective lens
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TLDR
An objective lens comprising five lens elements and intended for use in an optical recording system wherein a laser beam is focused onto a recording surface located beneath a plastic layer over the disc is described in this paper.Abstract:
An objective lens comprising five lens elements and intended for use in an optical recording system wherein a laser beam is focused onto a recording surface located beneath a plastic layer over the disc. The disclosed lens has a relatively large numeric aperture of 0.75, but has a relatively large working distance between the lens and the disc and a relatively low total mass, to facilitate rapid movement of the lens. In addition, the lens is color corrected to accommodate a range of spectral frequencies present in the laser beam.read more
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Patent
Objective for video disks
TL;DR: An objective for video disks comprising a first and second lens components is to be very light in weight and having aberrations such as spherical aberration, sine condition, etc. as discussed by the authors.
Patent
Reproducing objective for video disks
TL;DR: In this paper, a reproducing objective for video disks comprising a first, second, third and fourth lenses in the order from the reproducing light source side, the first lens being a biconvex or plano-convex lens, the second one being a negative meniscus lens and the third one being either a BIC or a plano concave lens, at least one of these lenses being arranged as a plastic lens, was presented.
Patent
Reproducing lens for video disc
TL;DR: In this article, a reproducing lens is composed of two convex lenses, a negative meniscus lens, and three and four positive lenses, in order to obtain a flat image, an excellent image resolution and a remarkably light weight.
Patent
Condensing lens for video discs
TL;DR: In this paper, the relationship between the radii of curvature and focal lengths of lenses satisfy certain conditions with the condensing lens comprising combination of convex lenses and concave lenses.