 System for information on demand, including multi-casting |
| The present invention provides a system for serving information, comprising: a router; a storage ... |
|
| Distributed network computing system for data exchange/conversion between terminals |
| OF THE INVENTION An embodiment of the present invention will be described below with reference to ... |
|
| Magnetically actuated electric switch |
| OF INVENTION Referring now to the single FIGURE of the drawing, a channel or passageway 4, formed ... |
|
| System and a process for recording cartographic information on a videodisk |
| The embodiments of the invention in which an exclusive property or privilege is claimed are defined ... |
|
| Optical information recording apparatus |
| It is an object of this invention to prevent errors of code discrimination which tends to occur ... |
|
| Loading and ejecting device for a disk player |
| OF THE PREFERRED EMBODIMENT Referring to FIGS. 1 and 2, a disc player comprises a casing 300 ... |
|
|
Magneto-optic recording structure and method
| Details |
Inventors: Muchnik, Boris J.; Spong, Fred W.;
Assignee: Kerdix, Inc. (Boulder, CO)
Primary Examiner: Canney; Vincent P.
Assistant Examiner:
Attorney, Agent or Firm: Rosen, Dainow & Jacobs
A magnetic magneto-optic recording structure and method in which a magneto-optic active layer is positioned within the fringing magnetic field of a magnetic recording medium, the structure preferably being disk-shaped. The magneto-optic layer is irradiated by a continuous wave laser beam, by way of a transparent substrate thereon, to locally reduce the coercivity of the magneto-optic layer, so that the magneto-optic layer becomes locally magnetized to align itself with the fringing magnetic fields created by the magnetization pattern of information previously recorded on the magnetic recording layer. The information thus recorded on the magneto-optic layer can be read out with a laser beam of lesser power, employing the Kerr effect. |
|
DETAILED DESCRIPTION What is claimed is: 1.
An integral recording structure comprising a magneto-optic layer and an opposed magnetic recording layer, data when magnetically recorded on said magnetic recording layer produces fringing magnetic fields, the magneto-optic layer being positioned to fall within the fringing magnetic field of data magnetically recorded on said magnetic recording layer, said magneto-optic layer being subject to local magnetization in alignment with said fringing field by reduction of the coercivity of the magneto-optic layer, said reduction being effected by application of a laser beam to said magneto-optic layer.
2.
The recording structure of claim 1 wherein said structure is disk-shaped, and further comprising a transparent substrate, said magneto-optic layer comprising a magneto-optically active layer on said transparent substrate.
3.
The recording structure of claim 2 wherein said magneto-optically active layer is an amorphous alloy of rare earth and transition metals having a perpendicular anisotropy.
4.
The recording structure of claim 3 wherein the rare earth elements of the magneto-optically active layer are selected from the group consisting of gadolinium, terbium and dysprosium, and the transition metal is selected from the group consisting of iron, cobalt and nickel.
5.
The recording structure of claim 2 wherein the magnetic recording layer is comprised of a dispersion of gamma ferric oxide particles in a polymeric binder.
6.
The recording structure of claim 4 wherein said magnetic recording layer is comprised of a dispersion of gamma ferric oxide particles in a polymeric binder.
7.
The recording structure of claim 2 wherein said magnetic recording layer is of chromium dioxide.
8.
The recording structure of claim 4 wherein said magnetic recording layer is of chromium dioxide.
9.
The recording structure of claim 1 wherein said magnetic recording layer is adapted for vertical recording.
10.
The recording structure of claim 2 further comprising an intervening dieletric layer between said magneto-optic layer and said magnetic recording layer for thermally and chemically isolating said magnetic recording layer and said magneto-optic layer
|
| Related patents |
|
|
Opto-magnetic recording apparatus for sequentially driving optical head drive means and biasing magnetic field generation means
It is an object of the present invention to provide an opto-magnetic recording apparatus which resolves the problems encountered in the prior art apparatus and allows ...
|
|
|
Method for reproducing information recorded on a magneto-optical recording medium including servo controlling the dimension of the reproduction region of the recording medium by means of a recorded signal
With the above in view, an object of this invention is to provide a reproducing method wherein even if there is any temperature change in a magneto-optical disc, the ...
|
|
|
Method and apparatus for simulating the processing of a workpiece
The present invention provides a method and an apparatus that avoids the disadvantages of the prior art and which makes possible a simulation of the processing of a ...
|
|
|
Image processing device and method
We claim: 1. An image processing device having a first memory, first data processing means for storing image data of a first type in said first memory, a second memory ...
|
|
|
High capacity run-length-limited coding system employing asymmetric and even-spaced codes
OF THE PREFERRED EMBODIMENTS The (2, 16, 2) Even-Spaced RLL Code The rate 2/5 (2, 16, 2) RLL encoder can be embodied as a finite-state machine with 23 states, as shown ...
|
|
|
Device and method for recording information on a disk
An object of the present invention is to provide a device and method for recording information on a disk wherein the disk is rotated at a constant speed to generate ...
|
|
|
Eccentricity correction during optical head accessing of a desired track
The object of the present invention is to provide an access method rapidly seeking for a desired track from a number of tracks formed on a rotating record medium, and an ...
|
|
|
Dual-longitudinal-mode ultrasonic testing
In accordance with the present invention, an emitter transducer means directs an ultrasound beam at an angle less than the first critical angle for a material body. This ...
|
|
|
Method for fine recording of video frames
The primary objective of the present invention is to solve the above mentioned problems of the prior methods and to provide a method for continuous video tape recording ...
|
|
|
Recording apparatus for a video signal and a control information indicative of a control state of a video camera
An object of the invention is to solve the above-described problem. Another object of the invention is to provide a video signal recording apparatus capable of improving ...
|
|
|
TV Signal 
