Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Patent
1992-06-10
1994-08-02
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
250571, 356445, 369 13, G01D 534, G11B 1304
Patent
active
053348494
ABSTRACT:
An apparatus and method for etching a point on the surface of a magnetic medium to reduce the reflectivity of the point and for verifying that proper etching occurred. A light source provides a collimated incident beam of light. The incident beam is focused to a point on the medium and a portion of the beam is reflected. The reflected beam is separated from the incident beam and the intensity of the reflected beam is measured. The measured intensity is compared to a threshold value and verification is indicated if the measured intensity exceeds the threshold value.
REFERENCES:
patent: 4633451 (1986-12-01), Ahn et al.
patent: 4831470 (1989-05-01), Brunnett et al.
patent: 4935835 (1990-06-01), Godwin et al.
patent: 4961123 (1990-10-01), Williams et al.
patent: 4985880 (1991-01-01), Yoshida et al.
patent: 5020040 (1991-05-01), Lee
patent: 5067039 (1991-11-01), Godwin et al.
patent: 5107107 (1992-04-01), Osborne
patent: 5204847 (1993-04-01), Tayefeh
Y. Y. Fan and V. M. Huynh, "Investigation of Light Scattering From Rough Periodic Surfaces-Numbered Solutions", Dept. of Mech. Eng. Univ. of Windsor, Ontario, Mar. 1992.
J. Mazumder, "Overview of Melt Dyanmics in Laser Processing", Optical Engin. vol. 30, No. 8, pp. 1208-1219 Aug. 1991.
M. W. Sasnett and T. F. Johnston, Jr., "Beam Characterization and Measurement of Propagation Attributes", Laser Beam Diagnostics, SPIE vol. 1414, Los Angeles 1991.
F. Jorgensen, "The Complete Handbook of Magnetic Recording" 3rd Edition, TAB Books, Inc.., Blue Ridge Summit, Pa. 1988 pp. 119-121.
"An Introduction to the Insite 325 Floptical.RTM. Disk Drive", Godwin, J., SPIE Optical Data Storage Topical Meeting vol. 1078, pp. 71-79, (1989).
"Optoelectronics--An Introduction", Wilson, J., Hawkes, J. F. B., School of Physics, Newcastle upon Tyne Polytechnic, Prentice/Hall International.
Bero James
Johnson Paul R.
Short Robert
Thomas Fred C.
Iomega Corporation
Lee John R.
Nelms David C.
LandOfFree
Apparatus for and method of verifying etching of optical servo i does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for and method of verifying etching of optical servo i, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for and method of verifying etching of optical servo i will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-66647