Optical disc write/read employing passive focus maintenance

Details Optical disc write/read employing passive focus maintenance Optical disc write/read employing passive focus maintenance

G - Physics

11

B

352/32.21

G11B 7/095 (2006.01) G11B 7/09 (2006.01)

Patent

CA 1204212

-0- OPTICAL DISC WRITE/READ EMPLOYING PASSIVE FOCUS MAINTENANCE Abstract The quality of spot-focus of optical writing and reading light upon the information surface of a flexible optical disc is passively enhanced by (1) rotating the disc with its neutral plane stabilized in space and (2) directing such light through the optical disc support into precise spot-focus on the informa- tion surface. With this technique spherical aberra- tion induced by the disc support compensates for thickness variation of the support. Various struc- tural embodiments are disclosed.

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