Wide aperture objective lens

Details Wide aperture objective lens Wide aperture objective lens

G - Physics

02

B

88/105

G02B 9/00 (2006.01) G02B 13/00 (2006.01) G02B 13/24 (2006.01) G02B 15/00 (2006.01)

Patent

CA 1142005

WIDE APERTURE OBJECTIVE LENS ABSTRACT OF THE DISCLOSURE 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.

386892

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