KR100852332B1 - Apparatus for processing of optical information and method for align of polytopic filter by using the same - Google Patents

Abstract

An apparatus for processing optical information and a polytopic filter aligning method using the same are provided to carry out alignment of polytopic filters for filtering a reproduction light by using the quantity of the reproduction light through a reproduction light optical system so as to align the polytopic filters when playing or recording optical information, thereby improving reproduction efficiency of the optical information. An optical information processing apparatus(100) comprises a reference light optical system(130), a signal light optical system(140), a light detector(160), and a reproduction light optical system(150). The reference light optical system generates a reproduction light from a reference light. The signal light optical system loads data on the signal light and performs Fourier-Transformation of the signal light. The reproduction light optical system carries out alignment of a polytopic filter for filtering the reproduction light, using the quantity of the reproduction light. The reproduction light optical system includes an inverse Fourier-Transformation lens(152), and a polytopic filter part(154) for aligning the polytopic filter. The polytopic filter part has polytopic filters(156), filter operating parts(158), and filter control parts.

Description

Apparatus for processing of optical information and method for align of Polytopic filter by using the same}

1 is a block diagram showing an optical information processing apparatus according to the present invention.

2 is an enlarged view showing an enlarged main part of an optical information processing apparatus according to the present invention.

3 is a perspective view showing the movement direction of the polytopic filter of the optical information processing apparatus according to the present invention.

4 is a flowchart illustrating a polytopic filter alignment process of an optical information processing apparatus according to an embodiment of the present invention.

5 is a flowchart illustrating a polytopic filter alignment process of the optical information processing apparatus according to another embodiment of the present invention.

** Description of the symbols for the main parts of the drawings **

100: optical information processing device

110: light source

120: light splitter

130: reference light optical system

140: signal light optical system

150: reproduction light optical system

154: polytopic filter unit

160: photodetector

The present invention relates to an optical information processing apparatus, and more particularly, to an optical information processing apparatus and a method for aligning a polytopic filter using the same to perform an alignment of a multiplex filter for multiplexing optical information when recording or reproducing optical information. will be.

The present invention relates to an optical information processing apparatus and an optical information processing method, and more particularly, to an optical information processing apparatus and an optical information processing method for processing optical information using two or more types of multiple recording methods.

One of the optical data processing apparatuses, the holographic optical information processing apparatus, is such that an interference fringe formed by intersecting two lights in a storage medium is recorded on the storage medium. This interference fringe can be said to be data for recording. One of the two lights is an optical modulated signal beam, and the other is a reference beam having the same wavelength. The holographic optical information processing apparatus irradiates only the reference light to the interference fringe formed on the storage medium, and detects a readout beam that is diffracted and reproduced from the interference fringe to reproduce the data.

The holographic optical information processing apparatus also uses various kinds of multiplexing methods to increase the recording capacity.

Multiplexing methods include angular multiplexing, phase-code multiplexing, wavelength multiplexing, and shift multiplexing. Peristrophic multiplexing, correlation multiplexing, and fractal multiplexing.

There are also techniques for applying two or more of these multiplexing methods in combination. Among the techniques of applying a plurality of multiplexing methods is a polytopic multiplexing method.

Polytopic multiplexing is disclosed in the US Pat. No. 7,092,133, proposed by Kenneth et al. Under the name “Polytopic multiplex holography”, and Optics letters, Volume 29, Issue 12, pp. Anderson, Ken, at 1402-1404 (June 2004); It is disclosed by Curtis, Kevin under the name "Polytopic multiplexing".

Polytopic multiplexing proposed by Kenneth et al. Records optical information by partial spatial overlapping of adjacent hologram stacks of a storage medium. Each hologram stack discloses that optical information can be multiplexed by any one of angle, wavelength, phase code, peristrophic, correlation, or fractal multiplexing.

On the other hand, the optical information recorded by the polytopic multiplexing as described above is configured such that when the specific optical information region is reproduced, the specific optical information region to be reproduced and other optical information regions adjacent to the optical information region are reproduced together.

Therefore, a separate polytopic filter must be provided to block optical information reproduced in another adjacent optical information region reproduced together when reproducing a specific optical information region.

The polytopic filter plays a very important role in improving the reproduction efficiency of a specific optical information region to be reproduced by blocking light reproduced in another adjacent optical information region when reproducing the specific optical information region when reproducing the optical information. .

In such a polytopic filter, it is very important to align the reproduction light with the reproduction light passing through the recording medium.

If the alignment of the reproduction light is poor, the reproduction light that is reproduced in another adjacent optical information area, such as the specific optical information area to be reproduced, may not be filtered, or the reproduction light that is reproduced in the specific optical information area may be blocked. The case occurs.

In the former case, in addition to the reproduction light reproduced in the specific optical information region, the reproduction light reproduced in another adjacent optical information region is included in the form of noise, thereby reducing the reproduction efficiency of the specific optical information region. In the latter case, a problem arises in that the reproduction efficiency of the specific optical information region is lowered by blocking the optical information reproduced in the specific optical information region.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an optical information processing apparatus and a poly using the same for correcting the alignment state of a polytopic filter for reproducing according to polytopic multiplexing when recording or reproducing optical information. The purpose is to provide a topic filter sorting method.

The optical information processing apparatus according to the present invention for achieving the above object comprises a reference light optical system for guiding the reference light to a recording medium so that reproduction light is generated by the reference light, and loading the data into the signal light and Fourier transforming the signal light. A signal light optical system for guiding a recording medium, and a photo detector for detecting the reproduced light, guiding the reproduced light to the photo detector, and filtering the reproduced light by using an amount of the reproduced light detected by the photo detector. And a reproduction light optical system for performing alignment of the polytopic filter.

The reproducing light optical system may include a polytopic filter unit configured to align an inverse Fourier transform lens for converting the regenerated light to a reverse Fourier and a polytopic filter for filtering the regenerated light according to the amount of the regenerated light detected by the photodetector. Equipped.

The polytopic filter unit controls the filter operation unit according to the polytopic filter through which the reproduction light is filtered, the filter operation unit controlling the position of the polytopic filter, and the amount of the reproduction light detected by the photodetector. A filter control unit is provided.

The optical information processing apparatus according to the present invention for achieving the above object comprises a reference light optical system for guiding the reference light to a recording medium so that reproduction light is generated by the reference light, and loading the data into the signal light and Fourier transforming the signal light. A signal light optical system for guiding the recording medium and a photodetector for detecting the signal light passing through the recording medium, guiding the signal light to the photodetector, the signal light detected by the photodetector. And a reproduction light optical system for performing alignment of the polytopic filter for filtering the reproduction light by using the amount of light.

The reproducing light optical system includes a inverse Fourier transform lens that changes the signal light inversely Fourier, and a polytopic filter which aligns the polytopic filter for filtering the regenerated light according to the amount of the light of the signal detected by the photodetector. .

The polytopic filter unit controls the filter operation unit according to a polytopic filter through which the reproduction light is filtered, a filter operation unit controlling a position of the polytopic filter, and a light amount of the signal light detected by the photodetector. A filter control unit is provided.

An optical information processing apparatus according to the present invention for achieving the above object comprises a reference light optical system for guiding the reference light to a recording medium so that the reproduction light is generated by the reference light, and a photodetector for detecting the reproduction light, And a reproduction light optical system for guiding reproduction light to the photodetector and performing alignment of a polytopic filter for filtering the reproduction light by using the amount of the reproduction light detected by the photodetector.

The reproducing light optical system includes an inverse Fourier transform lens for changing the reproducing light into a reverse Fourier, and a polytopic filter unit for aligning the reproducing light according to the amount of the reproducing light detected by the photodetector. .

The polytopic filter unit controls the filter operation unit according to the polytopic filter through which the reproduction light is filtered, the filter operation unit controlling the position of the polytopic filter, and the amount of the reproduction light detected by the photodetector. A filter control unit is provided.

According to an aspect of the present invention, there is provided a method for arranging a polytopic filter, including: loading a recording medium for reproducing optical information, generating reference light by entering reference light into the recording medium, and generating the reproduction light. And detecting the light through the polytopic filter, and controlling the polytopic filter to have the maximum amount of light of the reproduced light detected.

According to an aspect of the present invention, there is provided a polytopic filter alignment method comprising: loading a recording medium for recording optical information, generating a signal light passing through the recording medium, and passing the recording medium. Detecting the signal light through the polytopic filter, and controlling the polytopic filter to have the maximum amount of light of the signal light detected.

Hereinafter, an optical information processing apparatus and a polytopic filter alignment method using the same according to the present invention will be described in detail with reference to the accompanying drawings.

In the description of the present invention, the names of the elements defined are defined in consideration of functions in the present invention, and should not be understood as meanings that limit the technical elements of the present invention. May be referred to by other names in the art. In addition, the code added to each component is described for convenience of description, and the contents shown in the drawings in which these codes are described do not limit each component to the range in the drawing. In addition, as long as the functional similarity and identity thereof, even if the modified embodiment is adopted, it can be seen as an equivalent configuration, and even if the embodiment in which the modified part of the configuration is employed, it can be seen as an equivalent configuration.

First, the optical information processing apparatus according to the present invention will be briefly described with reference to the accompanying drawings.

1 is a block diagram showing an optical information processing apparatus according to the present invention.

As shown, the optical information processing apparatus 100 according to the embodiment of the present invention includes a light source 110, a polarization splitter 120, a reference light optical system 130, a signal light optical system 140, a reproduction light optical system 150, and a light. The detector 160 is provided.

The light source 110 generates light L having a predetermined wavelength. The light L generated from the light source 110 is a parallel light beam, and is preferably a planar wave laser light having excellent coherent. For example, it is desirable to have the wavelength required for holographic data storage.

The polarization splitter 120 divides the light L emitted from the light source into a pair of light for providing the reference light optical system 130 and the signal light optical system 140. The polarization splitter 120 has a polarization splitting surface for dividing the light L into polarization. The polarization splitting surface reflects the photodetector 160 light component to the reference light optical system 130 and transmits the S polarized light component to the signal light optical system 140.

The polarization splitter 120 further includes a reference light shutter 122 and a signal light shutter 124. The reference light shutter 122 blocks the optical path of the reference light R to block the reference light R, and the signal light shutter 124 blocks the optical path of the signal light S to block the signal light S. The reference light shutter 122 and the signal light shutter 124 will be described in detail in the operation description to be described later.

The P-polarized component is converted into S-polarized light by the reference light optical system 130 and provided as the reference light R at the time of recording or reproducing optical information, and the S-polarized light component is signal light for recording the optical information by the signal light optical system 140. Is switched to (S).

Polarization splitter 120 may be further provided with a separate light control member (not shown) for adjusting the divided light. The light adjusting member may be provided as a polarizing plate or a photosensitive filter.

The polarization splitter 120 may also be provided as a non-polarizer beam splitter (not shown). In this case, the light adjusting member may be provided as a polarizing plate for polarizing the light split in the non-polarization light splitter.

The reference light optical system 130 converts the light of the P-polarized component separated from the polarization splitter 120 into S-polarized light to provide the reference light R when recording or reproducing optical information. The reference optical system 130 includes a plurality of reflection mirrors 132 for setting an optical path, a half-wave plate 133 for switching polarization states, and a galvano mirror 134 for multiplexing optical information. .

The signal light optical system 140 is for converting one light separated by the polarization splitter 120 into the signal light S when recording the optical information. The signal optical system 140 includes an optical expander 142, a spatial light modulator 144, a spatial filter 146, and a Fourier transform lens 148.

The optical expander 142 expands the light area to convert one light separated from the polarization splitter 120. The optical expander 142 is formed of a plurality of lens combinations.

The spatial light modulator 144 loads the optical information data into the light extended by the optical expander 142 to form the signal light S. The spatial light modulator 144 is a typical TFT LC (thin film transistor liquid crystal) of the active matrix, STN LC (super twisted nematic liquid crystal) of the passive matrix, ferroelectric LC, polymer dispersion (PDLC, Polymer) Dispersed Liquid Crystal, and plasma addressed liquid crystal (PALC) may be employed.

The spatial filter 146 is provided to remove unnecessary light of a noise component in the signal light S on which data is loaded. The spatial filter 146 includes an optical filter in which a plurality of lenses and a focus of light are formed.

The Fourier transform lens 148 forms the signal light S on which data is loaded in the spatial light modulator 144 on the optical information recording medium D on which optical information is recorded. The signal light S formed by the Fourier transform lens 148 generates a light induced generation of mobile charge due to the intensity of the interference pattern due to the interference with the reference light R. The pattern is recorded on the recording medium.

The reproduction light optical system 150 guides the reproduction light P reproduced by the reference light R toward the photodetector 160 as the optical information stored in the recording medium D is reproduced by the reference light R. At the same time, it is provided to remove unnecessary light contained in the reproduction light P (for example, reproduction light reproduced in another optical information area adjacent to a specific optical information area to be reproduced).

The photodetector 160 detects reproduction light passing through the polytopic filter unit, and has an image recognition device having a pixel array such as a charge-coupled device (CCD) and a complementary metal-oxide semiconductor (CMOS). (image sensing device) can be adopted.

The reproducing light optical system 150 includes an inverse Fourier transform lens 152 for inverse Fourier transforming the reproduction light P reproduced on the recording medium D, and an unnecessary light in the inverse Fourier transformed reproduction light P. The polytopic filter unit 154 is provided.

Here, the polytopic filter unit 154 is reproduced in unnecessary light (for example, in another optical information region adjacent to a specific optical information region to be reproduced) in the inverse Fourier transform lens 152 by the inverse Fourier transform lens 152. Block regenerative light).

Hereinafter, the polytopic filter unit 154 as described above will be described in detail with reference to the accompanying drawings.

Figure 2 is an enlarged view showing the main part of the optical information processing apparatus according to the present invention in an enlarged view, Figure 3 is a perspective view showing the movement direction of the polytopic filter of the optical information processing apparatus according to the present invention.

As illustrated, the polytopic filter unit 154 is detected by the polytopic filter 156 that blocks light, the filter operation unit 158 and the photodetector 160 that rotate and move the polytopic filter 156. The filter control part 154a which operates the filter operation part 158 according to the light quantity is provided.

The polytopic filter 156 passes the reproduction light P reproduced in the optical information region to be reproduced upon reproduction of the optical information, and reproduces the reproduction light reproduced in another optical information region formed adjacent to the optical information region to be reproduced. (P) is provided to block.

Herein, the light amount of the reproduction light P passing through the polytopic filter 156 is set differently according to the multiplexing of the optical information recorded on the recording medium D, and according to the operation of the filter operation unit 158 which will be described later. As the filter 156 is rotated or moved, the amount of light of the regenerated light P passing through the polytopic filter 156 is adjusted.

The filter operation unit 158 rotates or moves the polytopic filter 156 to vary an area through which the reproduction light P reproduced on the recording medium D passes, as shown in FIG. 3. The polytopic filter 156 may be rotated about the vertical axis or the horizontal axis, or may be moved in the vertical direction or the horizontal direction. This filter operation 158 is formed by the combination of a plurality of micro actuators.

The filter control unit 154a controls the amount of light passing through the polytopic filter 156 by controlling the filter control unit 154a according to the amount of light detected by the photodetector 160. The filter operating unit 158 is adjusted according to the multiplexing of the medium D to filter out unwanted regenerated light P from the regenerated light passing through the polytopic filter 156, or to adjust the initial position of the polytopic filter 156. It is arranged to control.

According to the operation of the polytopic filter unit 154 as described above, when the polytopic filter 156 is rotated by θ by the filter operating unit 158, the reproduction light P passing through the polytopic filter 156 is It can be seen that the light area of is reduced from a to b. The operation of the filter control unit 154a will be described in detail later in the operation description.

Accordingly, the alignment of the polytopic filter by the optical information processing device and the optical information processing device according to the present invention will be described in detail with reference to the embodiments. Each element mentioned below should be understood with reference to the above description and drawings.

Here, the present invention relates to the alignment of the polytopic filter, and description of the recording and reproduction of the optical information by the optical information processing apparatus will be omitted.

On the other hand, the alignment of the polytopic filter by the optical information processing apparatus according to the present invention can be performed at the time of reproduction of the optical information and at the time of recording the optical information, respectively. Therefore, the alignment of the polytopic filter is explained by separating the reproduction of the optical information and the recording of the optical information.

First, an alignment process of a polytopic filter at the time of reproduction of optical information will be described with reference to the accompanying drawings. 4 is a flowchart illustrating a polytopic filter alignment process of an optical information processing apparatus according to an embodiment of the present invention.

As shown, when the optical information is reproduced, the optical information recording medium D to be reproduced is loaded (step S110).

As the recording medium D is loaded, light L is generated by the light source 110, and the light L generated by the light source is guided to the recording medium D by the reference light optical system 130 to be recorded. Temporarily reproduces the optical information stored in to generate the reproduction light (P) (step S120). Here, the signal light S guided to the signal light optical system 140 is blocked by the signal light shutter 124.

The regenerated light P reproduced therethrough is moved toward the photodetector 160 while passing through the polytopic filter unit 154 of the regenerated optical system 150. At this time, the filter control unit 154a of the polytopic filter unit 154 controls the filter operation unit 158 to adjust the light area of the reproduction light P passing through the polytopic filter 156.

That is, the filter control unit 154a moves the polytopic filter vertically or horizontally, or rotates the vertically or horizontally to adjust the light area of the reproduction light P passing through the polytopic filter 156 (step S130). .

Accordingly, the light detector 160 senses the amount of light of the regenerated light P passing through the polytopic filter unit 154 (step S140). At this time, the amount of the reproduced light P detected is the reproduced light whose light area is adjusted by the polytopic filter unit 154.

On the other hand, the light amount of the reproduced light P detected by the photodetector 160 is provided to the filter control unit 154a, and the filter control unit 154a has a maximum light quantity of the reproduced light P detected by the photodetector 160. The filter operation unit 158 is repeatedly controlled so that it can be performed (step S160).

Accordingly, when the amount of the reproduced light P detected by the photodetector 160 reaches a maximum value, the filter controller 154a fixes the position of the polytopic filter 156 and the optical information processing apparatus 100 is mounted on the recording medium. The stored optical information is reproduced (step S170).

Hereinafter, an alignment process of a polytopic filter at the time of recording optical information will be described with reference to the accompanying drawings. 5 is a flowchart illustrating a polytopic filter alignment process of the optical information processing apparatus according to another embodiment of the present invention.

As shown in the drawing, the optical information recording medium D for recording the optical information is loaded (step S210).

As the recording medium D is loaded, the light L is generated by the light source 110, and the light L generated by the light source is separated by the light splitter 120, and the recording medium D is generated by the signal light optical system 140. Guided by). The reference path R separated by the light splitter 120 and guided to the reference light optical system 130 is blocked by the reference light shutter 122.

The signal light S incident on the signal light optical system 140 is converted into the measurement signal light S for alignment of the polytopic filter unit 154 by the spatial light modulator 144 (step S220). The measurement signal light S may be formed by loading data consisting of a specific pattern or only on pixels in the signal light S passing through the spatial light modulator 144.

Accordingly, the signal light optical system 140 enters the measuring signal light S into the recording medium D and passes through the recording medium D so that the measuring signal light S is detected by the photodetector (step S230).

Accordingly, the measurement signal light S passing through the recording medium D is moved toward the photodetector 160 while passing through the polytopic filter 154 of the reproduction light optical system 150. At this time, the filter control unit 154a of the polytopic filter unit 154 controls the filter operation unit 158 to adjust the light area of the measurement signal light S passing through the polytopic filter 156.

That is, the filter control unit 154a moves the polytopic filter vertically or horizontally, or rotates the vertically or horizontally to adjust the light area of the measurement signal light S passing through the polytopic filter 156 (step S240). ).

Accordingly, the light detector 160 senses the amount of light of the measurement signal light S that has passed through the polytopic filter unit 154 (step S250). The amount of light of the measurement signal light S detected at this time is the measurement signal light S whose light area is adjusted by the polytopic filter unit 154.

On the other hand, the light amount of the measurement signal light S detected by the photodetector 160 is provided to the filter control unit 154a, and the filter control unit 154a has a maximum light quantity of the measurement signal light S detected by the photodetector 160. Filter operation unit 158 is repeatedly controlled to have a (step S260).

When the amount of light of the measurement signal light S detected by the photodetector 160 reaches a maximum value, the filter controller 154a fixes the position of the polytopic filter 156. Thereafter, the optical information processing apparatus 100 receives the reference light R and the signal light S loaded with the optical information data on the recording medium D to record the optical information (step S270).

Although described in detail with respect to preferred embodiments of the present invention as described above, those of ordinary skill in the art, without departing from the spirit and scope of the invention as defined in the appended claims Various modifications may be made to the invention. Therefore, changes in the future embodiments of the present invention will not depart from the technology of the present invention.

As described above, according to the optical information processing apparatus and the polytopic filter sorting method using the same according to the present invention, the reproduction efficiency of the optical information may be improved by arranging the polytopic filters when the optical information is reproduced or recorded. There is.

Claims (11)

A reference light optical system for guiding the reference light to the recording medium so that reproduction light is generated by the reference light; A signal light optical system which loads data into signal light and Fourier transforms the signal light to guide the recording medium; A photodetector for detecting the regenerated light, And a reproducing light optical system for guiding the reproducing light to the photodetector and performing alignment of a polytopic filter for filtering the reproducing light by using the amount of the reproducing light detected by the photodetector. Processing unit. The optical system of claim 1, wherein the reproducing optical system An inverse Fourier transform lens for converting the reproduced light into an inverse Fourier, And a polytopic filter for aligning the polytopic filter for filtering the reproduced light according to the amount of the reproduced light detected by the photodetector. The method of claim 2, wherein the polytopic filter unit A polytopic filter through which the regenerated light is filtered; A filter operating unit for controlling the position of the polytopic filter; And a filter control unit for controlling the filter operation unit in accordance with the light amount of the reproduced light detected by the photodetector. A reference light optical system for guiding the reference light to the recording medium so that reproduction light is generated by the reference light; A signal light optical system which loads data into signal light and Fourier transforms the signal light to guide the recording medium; A photodetector for detecting the signal light passing through the recording medium, The signal light guides the signal light to the photodetector and is detected by the photodetector. And a reproduction light optical system for performing alignment of the polytopic filter for filtering the reproduction light by using the amount of light. The optical system of claim 4, wherein the reproducing optical system An inverse Fourier transform lens for converting the signal light into an inverse Fourier, And a polytopic filter for aligning the polytopic filter for filtering the reproduction light according to the amount of light of the signal light detected by the photodetector. The method of claim 5, wherein the polytopic filter unit A polytopic filter through which the regenerated light is filtered; A filter operating unit for controlling the position of the polytopic filter; And a filter control unit for controlling the filter operation unit in accordance with the amount of light of the signal light detected by the photodetector. A reference light optical system for guiding the reference light to the recording medium so that reproduction light is generated by the reference light; A photodetector for detecting the regenerated light, And a reproducing light optical system for guiding the reproducing light to the photodetector and performing alignment of a polytopic filter for filtering the reproducing light by using the amount of the reproducing light detected by the photodetector. Processing unit. The optical system of claim 7, wherein the reproducing optical system An inverse Fourier transform lens for converting the reproduced light into an inverse Fourier, And a polytopic filter for aligning the polytopic filter for filtering the reproduced light according to the amount of the reproduced light detected by the photodetector. The method of claim 8, wherein the polytopic filter unit A polytopic filter through which the regenerated light is filtered; A filter operating unit for controlling the position of the polytopic filter; And a filter control unit for controlling the filter operation unit in accordance with the light amount of the reproduced light detected by the photodetector. Loading a recording medium for reproducing optical information; A reference light is incident on the recording medium to generate reproduction light; Detecting the reproduced light through a polytopic filter; And controlling the polytopic filter such that the amount of light of the reproduced light detected has a maximum amount of light. Loading a recording medium for recording optical information; Generating signal light passing through the recording medium; Detecting the signal light passing through the recording medium through a polytopic filter; And controlling the polytopic filter so that the amount of light of the signal light detected has a maximum amount of light.

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