Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1994-06-14
1996-04-23
Ben, Loha
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369112, 369116, 369120, 369 4437, G11B 700
Patent
active
055110592
ABSTRACT:
A multi-element grating beam splitter with a reflection grating for use in providing a front facet detector signal in an optical system. The multi-element grating beam splitter includes first, second, third, and fourth grating elements for separating a return beam reflected and diffracted from a data track on an optical storage medium into first, second, third and fourth portions, respectively. The grating beam splitter also includes a fifth grating element, which is preferably a reflection grating, for directing a portion of an incident radiation beam onto a front facet detector. The front facet detector signal may be subtracted from a data signal resulting from detection of the first, second, third and fourth portions of the return beam in order to limit the effect of optical source noise on the data signal.
REFERENCES:
patent: 4689479 (1987-08-01), Tatsuno et al.
patent: 4731772 (1988-03-01), Lee
patent: 4894815 (1990-01-01), Yamanaka
patent: 4945529 (1990-07-01), Ono et al.
patent: 4983017 (1991-01-01), Tsuji et al.
patent: 5050153 (1991-09-01), Lee
patent: 5136152 (1992-08-01), Lee
patent: 5172368 (1992-12-01), Lehurea
patent: 5270996 (1993-12-01), Ono
patent: 5363363 (1994-11-01), Gage
W. Ophey, "Compact Optical Light Paths," Jpn. J. Appl. Phys., vol. 32, Part I, No. 11B, pp. 5252-5257, Nov. 1993.
E. Gage and S. Beckens, "Effects of high frequency injection and optical feedback on semiconductor laser performance", SPIE Proceedings, vol. 1316, Optical Data Storage, pp. 199-204, Mar. 1990.
Gray, et al., "Control of optical-feedback-induced laser intensity noise in optical data recording", Optical Engineering, vol. 32, No. 4, pp. 739-745, Apr. 1993.
S. Kadowaki, et al., "Integrated Holographic Optical Pickup Head with Wide Allowance Range," Proc. Int. Symp. on Optical Memory 1989, Jpn. Jnl. of Appl. Phys., vol. 28, Supplement 28-3, pp. 189-192, 1989.
M. Kato, et al., "Recent advances in optical pickup head with holographic optical elements," SPIE Proceedings, vol. 1507, Holographic Optics III: Principles and Applications, pp. 36-44, 1991.
M. Kato, et al., "Holographic Servo-Signal Detection Stabilized to the Wavelength Fluctuation and the Mechanical Misalignment in the Optical Heads," SPIE Proceedings, vol. 1078, Optical Data Storage Topical Meeting, pp. 122-126, 1989.
A. Marchant, "Optical Recording: A Technical Overview," Addison-Wesley, Reading, Mass., pp. 172-179.
Laser Diode User's Manual, Sharp Corp., Hologram Laser Unit Data Sheet, Models LTOH30P, LTOH30M, LTOH31P and LTOH12M, p. 2, 1993.
Pencom International Corp., Laser/Detector Optical Head Data Sheet, Models 50 and 60, 1993.
Philips Corp., Radialinear CD Mechanisms Data Sheet, Models CDM-9 and CDM-12, 1993.
Blue Sky Research, San Jose, Calif., Data Sheet, Model VPS700 lens, 1992.
Ben Loha
Eastman Kodak Company
Owens Raymond L.
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