Optical recording and reproducing apparatus, optical head,...

Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet

Reexamination Certificate

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C369S044320, C369S112230

Reexamination Certificate

active

07462855

ABSTRACT:
An optical recording and reproducing apparatus for recording and/or reproducing an optical recording medium by irradiating light from a light source to the optical recording medium as near-field light from a near-field light irradiating unit includes a light source for emitting light, a first light-receiving unit for receiving and detecting returned light from the optical recording medium, a second light-receiving unit for receiving and detecting returned light from the near-field light irradiating unit, a control unit for detecting a relative skew between the optical recording medium and the near-field light irradiating unit based on a plurality of gap detection signals generated from divided detection signals of the second light-receiving unit and a drive control unit for outputting a drive signal to correct a skew of at least the near-field light irradiating unit to a drive unit in response to a skew detected in the control unit.

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patent: WO 2006/018749 (2006-02-01), None
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Masataka Shinoda, et al., “High-Density Near-Field Readout over 50 GB Capacity Using Solid Immersion Lens with High Refractive Index”, Japanese Journal of Applied Physics, vol. 42, Feb. 2003, pp. 1101-1104.
Tsutomu Ishimoto, et al., “Gap Servo System for a Biaxial Device Using an Optical Gap Signal in a Near Field Readout System”, Japanese Journal of Applied Physics, vol. 42, May 2003, pp. 2719-2724.
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Hyuck-Dong Kwon, et al., “Gap maintenance system using near-field optics and piezoelectric materials for near-field recording”, Proceedings of SPIE, XP-002395989, vol. 4902, 2002, pp. 68-77.

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