Dynamic information storage or retrieval – Specific detail of information handling portion of system – Electrical modification or sensing of storage medium
Reexamination Certificate
1998-03-06
2001-07-31
Dinh, Tan (Department: 2752)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Electrical modification or sensing of storage medium
C369S044230, C369S044370, C369S112040, C369S103000
Reexamination Certificate
active
06269066
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
Fields of the inventions are: Data Storage, Compact Disc, and Optical Storage
Fields of search are: 235/375, 462; 250/201.5; 350/166, 355, 356, 375, 381, 383, 385, 386, 387, 388, 392; 359/245, 248, 250, 276, 281; 360/18, 24, 32, 33.1, 39, 72.01, 72.02; 369/44.23, 44.41, 44.42, 44.37, 59, 102, 111, 112, 124, 275.1, 275.3,
2. Description of the Prior Art
Current optical disc data pickup systems employ an electro-mechanical gimbal optical system to track and read the data band spiral. These gimbal systems use a single diode laser. In the more conventional system the laser beam is diffracted into three beams. In this approach the center beam reads the data while the outer beams track the spiral. Tracking errors generated by the tracking beams produce a mechanical torque to swivel the optical system so as to bring the reading beam to the center of the data spiral.
Techniques are also known wherein the light probe employed to track and read the data band spiral is delivered to the surface of the disc by an optical fiber. In this approach the fiber is in a permanent magnet inside an electro-magnet. An electrical current in the electro-magnet causes the permanent magnet to move. This causes the fiber to move thus translating the light probe across the surface of the disc.
Techniques are known whereby a constructive interference fringe can be produced and its position controlled by an electric field:
3,506,334
Apr., 1970
A. Korpel
5,071,253
Dec., 1991
R. Chase
Techniques are known whereby digital data can be recorded on and read from an optical compact disc:
5,587,983
Dec., 1996
J. Bailey
5,646,920
Jul., 1997
W. Raczynski
SUMMARY OF THE INVENTION
This invention uses an interferometer in combination with an electro-optic prism to generate an Electronically translocatable Optical Stylet. A converging pencil of light rays is injected into the interferometer where it is regenerated into a plurality of diverging pencils of light rays. These diverging pencils are collected and converged into a constructive interference fringe on the surface of an optical data storage disc. The location of this fringe on the disc is controlled by controlling the wavelength of the light and the voltage applied across the electro-optic prism.
It is the prime objective of this invention to provide a precision electronically controlled spot of light to track and read data from an optical data storage disc.
It is another objective of this invention to provide a precision electronically controlled spot of light to write data on an optical data storage disc.
It is a further objective of this invention to provide precision control of a spot of light that has no moving mechanical components.
It is an additional objective of this invention to provide an optical probe compatible with a multitude of optical data storage disc formats such as the compact disc and the digital viedo disc.
REFERENCES:
patent: 3506334 (1970-04-01), Korpel
patent: 3597701 (1971-08-01), Cornillault
patent: 3603685 (1971-09-01), Heflinger
patent: 4789978 (1988-12-01), Shikama et al.
patent: 5071253 (1991-12-01), Chase
patent: 5119454 (1992-06-01), McMahon
patent: 5587983 (1996-12-01), Bailey
patent: 5646920 (1997-07-01), Raczynski
patent: 5883875 (1999-03-01), Coufal et al.
H. Kogelnik Theory of Dielectric Waveguides, 1979.
Chu Kim-Kwok
Dinh Tan
Lalos & Keegan
Lau Michael N.
Scully Richard L.
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