G - Physics – 02 – B
Patent
G - Physics
02
B
352/32, 88/94
G02B 17/00 (2006.01) G02B 5/00 (2006.01) G11B 7/085 (2006.01)
Patent
CA 1174492
K 03 UV-50P OPTICAL PLAYBACK APPARATUS, FOCUSING ELEMENTS, AND FOCUSING SYSTEM FOR PRODUCING A PRESCRIBED ENERGY DISTRIBUTION ALONG AN AXIAL FOCAL ZONE ABSTRACT OF THE DISCLOSURE An optical playback system for reading data from a record includes a focusing system for focusing a scanning light beam onto data on the record without need for precision positioning of the record and optical elements of the system. The light beam is modulated by the data and then transmitted to a light detector to produce a playback data signal corre- sponding to the recorded data. The focusing system includes a source of light having an axially symmetric intensity dis- tribution and a lens designed to focus such light into a focal zone with a specified intensity distribution along the zone. This distribution is preferably uniform so as to provide the detector with a modulated light beam of uniform average inten- sity regardless of the position of the record along to focal zone. The lens is but one member of an entire family of non- conical, aspherical axicon-type focusing elements designed in accordance with a method described herein to focus energy from given source to a prescribed focal zone intensity distribution.
393477
Brenden Byron B.
Russell James T.
Digital Recording Corporation
Oyen Wiggs Green & Mutala Llp
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