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Proceedings Paper

Evaluation Of Optical Disk Surfaces
Author(s): Koichi Yamada; Isao Watanabe; Osamu Ito; Takahiro Kubo
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Paper Abstract

Laser beam is focused on a rotating disk. As the reflected light intensity VDC is modulated by irregularity of an optical disk surface, noise VAC in the VDC is observed. Effect of the irregularity of the optical disk surface is given by S/ND = 20 log(VDC/2√2VAC). If the noise is not increased in recording and the reflected light is modulated 100% by the carrier signal in playback, carrier to noise ratio C/N reaches this S/ND. The carrier signal was recorded on an Al-Cr thin film (observed S/ND was 81 dB) on the glass substrate (S/ND was 87 dB), obtained C/N was 69 dB.

Paper Details

Date Published: 27 May 1982
PDF: 5 pages
Proc. SPIE 0329, Optical Disk Technology, (27 May 1982); doi: 10.1117/12.933401
Show Author Affiliations
Koichi Yamada, Mitsubishi Electric Corporation (Japan)
Isao Watanabe, Mitsubishi Electric Corporation (Japan)
Osamu Ito, Mitsubishi Electric Corporation (Japan)
Takahiro Kubo, Mitsubishi Electric Corporation (Japan)

Published in SPIE Proceedings Vol. 0329:
Optical Disk Technology
Robert A. Sprague, Editor(s)

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