Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1998-07-24
2000-10-10
Lee, John R
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
369 4432, 250557, 250234, G11B 700
Patent
active
061304182
ABSTRACT:
An optical scanning device for scanning an optically readable record carrier (1) includes a radiation source (5), a radiation-sensitive detection system (7), and an optical scanning unit for focusing a scanning beam (3) produced by the radiation source to a scanning spot (9) on the record carrier. The scanning unit including a lens system having an optical axis (13), which lens system includes a first lens unit having a main lens (15) and a second lens unit having an auxiliary lens (17). The scanning device further includes a first detection unit involved in detection of the main lens with respect to the record carrier, and a second detection unit involved in detection of the auxiliary lens. The scanning unit further includes a first electrical drive unit for moving the first lens unit in dependence upon a signal supplied by the first detection unit, and a second electrical drive unit for moving the second lens unit with respect to the main lens in dependence upon a signal supplied by the second detection unit. The second drive unit includes a first part and a second part which cooperates with the first part via an air gap (51). The first part is secured to the first lens unit and the second part is secured to the second lens unit. In order to counteract spherical aberration and/or coma and/or astigmatism during scanning the second detection unit includes a position and orientation detector system for detecting the position and orientation of the auxiliary lens with respect to the record carrier during scanning.
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patent: 5850081 (1998-12-01), Yanagisawa
"A 0.8 Numerical Aperture Two Element Objective Lens for the Optical Disk", Kenji Yamamoto et al, International Symposium on Optical Memory and Optical Data Storage, conference edition Jul. 8-12, 1996 (ISOM 96); OFA 2-1/345-OFA2-3/347.
van Rosmalen Gerard E.
Willems Van Dijk Marcus J. H.
Biren Steven R.
Kinnear Glenn T
Lee John R
U.S. Philips Corporation
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