Boots – shoes – and leggings
Patent
1994-08-12
1995-12-26
Epps, Georgia Y.
Boots, shoes, and leggings
365109, 365117, 365145, G11B 1304, G11C 1142
Patent
active
054793840
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an optical memory. More specifically, the invention relates to an optical memory which has a high storage capacity, short access time for writing and reading of information, and which can be implemented entirely without any movable mechanical parts.
DESCRIPTION OF THE PRIOR ART
Today's systems for mass storage of binary information can be roughly divided into three main categories:
1. Magnetic medium (hard disc)
2. Optical medium (CD-ROM)
3. Magneto-optical medium
1. A hard disc, i.e. a magnetic disc storage which is mechanically rotated when writing and reading information, requires mechanical positioning of a read-write head, entailing a relatively long average seek time for positioning in the order of 10-15 ms, a limited read-write speed, as well as a relatively limited storage capacity. In principle, the storage capacity of a hard disc can only be increased by using a larger area, which entails the disadvantage of necessitating a larger movement for positioning, i.e. a longer seek time.
2. A CD-ROM has a comparatively high storage capacity, but is a slow medium which does not permit writing but only reading since, traditionally, the information is stored when making the memory.
3. A magneto-optical medium, which is of a design closely related to that of a CD-ROM, acts such that the information is stored on a rotary disc containing magnetic particles which, when writing the information, are heated by a laser beam above their Curie temperature. Drawbacks of this type of storage medium are the relatively limited capacity and the slow writing speed. Writing may, for example, be up to six times slower than for a hard disc.
SUMMARY OF THE INVENTION
With the ever increasing need of information storage, there is a great demand for a storage medium that does not suffer from the aforementioned drawbacks of the prior art. A general object of the invention is to provide a storage medium meeting this demand.
A first object of the invention is to provide a storage medium having a high storage capacity.
A second object of the invention is to provide a storage medium having short access time for writing and reading of information.
A third object of the invention is to provide a storage medium that can be implemented without any mechanically movable parts.
A fourth object of the invention is to provide a storage medium having a compact structure and relatively small dimensions, and being relatively inexpensive to manufacture.
A fifth object of the invention is to provide a storage medium enabling parallel writing and reading of information.
To achieve these and other objects, there is provided according to the invention an optical memory, comprising:
a plurality of juxtaposed memory cells, each of which is adapted to receive a respective light beam and each of which comprises a storage medium including: mutually different optical properties by applying corresponding electric fields between a light entry side and an opposite light exit side of the storage element; light exit side of the storage element and exhibiting a plurality of mutually electrically insulated electrode points distributed over the storage element, corresponding to an equal plurality of memory points in the storage medium; entry side and the light exit side of the storage element; and light-dependent electric resistance, said layer being arranged over and in electrical contact with the electrode matrix on the side thereof facing away from the storage element, point in the storage element by selectively illuminating the corresponding point on the photoconductive layer while applying an electric control voltage between the photoconductive layer and the common electrode, and
electrically controlled means for bringing about a simultaneous and mutually equally large displacement of the point of incidence of each of the light beams of the memory cells on the corresponding memory cell.
In an optical memory according to the invention, each memory point of the storage medium of each individual memo
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Jozsef Karoly
Toth Peter
Dinh Tan
Epps Georgia Y.
Toth Peter
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