Evaluation Of Optical Disk Surfaces

Koichi Yamada; Isao Watanabe; Osamu Ito; Takahiro Kubo

doi:10.1117/12.933401

27 May 1982 Evaluation Of Optical Disk Surfaces

Koichi Yamada, Isao Watanabe, Osamu Ito, Takahiro Kubo

Proceedings Volume 0329, Optical Disk Technology; (1982) https://doi.org/10.1117/12.933401
Event: 1982 Los Angeles Technical Symposium, 1982, Los Angeles, United States

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.

Citation Download Citation

Koichi Yamada, Isao Watanabe, Osamu Ito, and Takahiro Kubo "Evaluation Of Optical Disk Surfaces", Proc. SPIE 0329, Optical Disk Technology, (27 May 1982); https://doi.org/10.1117/12.933401

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