Optical storage method utilizing light variation image

Abstract

There is an optical storage method taking advantage of light-changing graph, its characters lies in that it incldues steps as follows: (1) it changes stored information into graph, word or data list with given coding mode; (2) according to the characters of light-changing graph, it arranges the graph and word list in step (1) into light-changing graph and word. Hereinto, so called light-changing graph is made up of grating unit array, each grating unit is made of elaborate graph, word or data bit and the scale of grating unit is no more than 160 micron; (3) it storages the light-changing graph acquired from step (2) to recording material by light-changing graph copy-arrangement system. Technical scheme of the invention realizes high information-density light-changing's stored light-carving of the random digital graph and word.

Description

technical field [0001] The invention relates to a storage method, in particular to an optical storage method realized by using optically variable images. Background technique [0002] The main physical meaning of the so-called optical storage is to record and save a large amount of information that can be read out on the storage material by using the optical properties of the storage material in a small space of the storage material. The main method of existing optical storage is to place the input image or text on the front focal plane of the Fourier lens through the method of Fourier transform on the volume material, and record the input image by interference on the back focal plane. The Fourier transform map of , in a very small volume type recording material (such as photorefractive cubic crystal), for high information density storage. Chinese invention patent application CN1274915A discloses a fixed three-dimensional photonic storage device, inclu...

AI Technical Summary

Problems solved by technology

The storage capacity of this method is proportional to the reciprocal of the cube of the recording wavelength, and the theoretical storage density can reach 10 13 bits / cm 3 , however, the two beams of light after beam splitting, the object light provides information input, and the reference light provides reference interference, so there are the following disadvantages: 1. The change range of the object light intensity is very large, and it is difficult to obtain uniformity in the recording area. 2. In the non-overlapping area of ​​the two beams of light, the reference light is still exposed to the recording material, which increases the background noise. Therefore, this method is used for high-density storage , the signal-to-noise ratio of the stored image will decrease significantly with the increase of the stored image, and it is difficult to obtain a higher storage density with a high signal-to-noise ratio in practice

However, in addition to the image information expressed macroscopically, the information carrying capacity of this optically variable image is limited, and it does not have the function of carrying a large amount of information.

Images