Static information storage and retrieval – Read/write circuit – Optical
Reexamination Certificate
2003-03-05
2004-07-20
Lebentritt, Michael S. (Department: 2824)
Static information storage and retrieval
Read/write circuit
Optical
C365S106000, C365S171000, C365S230010
Reexamination Certificate
active
06765837
ABSTRACT:
BACKGROUND OF THE INVENTION
In the modern age of rapidly developing information and related industries, it is expected to produce memory devices with high-density, high speed and high storage capacity of information.
It is known that a microlens-based optical memory media may be provided for enabling large data volumes to be transferred at a high data rate and thereby permitting the mass production of the optical memory media.
For instance, U.S. Pat. No. 6,005,817 issued to Gudesen et al. disclosed a method for parallel writing and reading of data in an optical memory including a plurality of microlens for accessing a memory medium, individually addressable elements arranged in a matrix or matrices in a write and read device to be activated for influencing localized areas in the memory for writing and reading of data carrying structures in the localized areas. However, to precisely and reliably fix the plurality of microlens on the memory module requires a very sophisticated manufacturing technique, thereby greatly increasing the production cost thereof. Meanwhile, the storage density of this prior art will be limited by the wavelength of the light source as selected, thereby influencing its commercial value.
The present inventor has found the drawbacks of the conventional memory device and invented the present memory device with microholes.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a memory device including a substrate, at least a thin film superimposed on the substrate having a plurality of microholes formed in the thin film, with a first microhole having a zero depth designated as digital zero; and a second microhole having a specific depth (such as the microhole formed through the thickness of the thin film) designated as digital one; whereby upon scanning of the microholes by a focused electron beam, the physical property as responded in each microhole will be detected as a digital bit corresponding to the microhole, and the digital data of the memory device will be read or recorded in an easier and cost-saving way.
REFERENCES:
patent: 5568421 (1996-10-01), Aritome
Lebentritt Michael S.
Luu Pho M.
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