KR100767931B1 - Optical information processing apparatus, method of processing optical information and optical information storage medium - Google Patents

Abstract

An optical information processing apparatus according to the present invention includes an optical splitter for dividing a light having a predetermined wavelength, a first servo control light which is split in the optical splitter and is incident on an optical information storage medium on which optical information is recorded or reproduced, the optical information storage medium. Detecting the first servo control light reflected from the optical information storage medium to measure a focusing state of the optical information storage medium, and splitting the first servo control light from the first optical detector and the optical splitter so that the optical information storage medium is different from the first servo control light. The second servo control light for angle multiplexing incident at an angle, and the second servo control light reflected from the optical information storage medium to measure an angle multiplexing position for recording or reproducing optical information on the optical information storage medium. The optical information processing apparatus, the optical information processing method and the optical information storage medium according to the present invention are provided with a second photodetector. It performs minute superposition recording, and adopts an effective angular multiplexing method for this purpose, and makes it possible to track, focus and multiplex servo control for the superposition recording and angular multiplexing with the minimum optical system. There is an effect to improve the efficiency.

Description

Optical information processing apparatus, method of processing optical information and optical information storage medium

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

2 is a diagram schematically illustrating a configuration of a second photodetector in an optical information processing apparatus according to an embodiment of the present invention.

3A, 3B, 3C, 3D, and 3E are conceptual views illustrating an angle multiplexing state of an optical information processing apparatus according to an embodiment of the present invention.

4 is an enlarged partial perspective view illustrating a reflective surface of an optical information storage medium used in an optical information processing apparatus according to an exemplary embodiment of the present invention.

5 is a partial cross-sectional view showing an optical information storage medium used in the optical information processing apparatus according to the embodiment of the present invention.

6 is a flowchart illustrating an optical information processing method according to an embodiment of the present invention.

7A and 7B illustrate a state in which the second servo control light incident at a predetermined angle in the optical information processing apparatus according to the embodiment of the present invention is reflected from the control light reflecting surface.

8A and 8B illustrate a state in which the second servo control light incident at another predetermined angle in the optical information processing apparatus according to the embodiment of the present invention is reflected on the control light reflecting surface.

The present invention relates to an optical information processing apparatus, an optical information processing method, and an optical information storage medium, and more particularly, to a part of overlapping angle multiplexing of optical information in an optical information storage medium having a reflecting surface that reflects incident light. An optical information processing apparatus, an optical information processing method, and an optical information storage medium for performing servo control.

Optical data processing apparatuses include Digital Versatile Disc (DVD), HD-DVD, Blu-ray Disc (BD), near field light processing apparatus, holographic light processing apparatus, and the like.

The holographic light processing apparatus receives an optical modulated signal beam and a reference beam that intersects the signal light to form an interference fringe on the storage medium, and stores the data. In the reproduction of data, only the reference light is incident on the hologram of the storage medium so that data input to the storage medium is output by diffraction generated in the hologram.

In order to increase the recording capacity, the holographic optical information processing apparatus may store data in a multiplex by irradiating a reference light to one beam spot at different angles. The multi-input data can be output by irradiating only the reference light at different angles during reproduction. In other words, the holographic light processing device is a supercapacitive data storage device capable of inputting and outputting data in a multi-layered and overlapping state at one light spot.

In the holographic optical information processing apparatus, a method of multiplexing light is used to increase the recording density of data. Methods of multiplexing light include angular multiplexing, phase-code multiplexing, wavelength multiplexing, and shift multiplexing. Here, the angular multiplexing method is to multiplex by changing the incident angle of the reference light, the phase code multiplexing is to multiplex by modulating the phase spatially, the wavelength multiplexing is to multiplex according to the wavelength change using a wavelength tunable laser, the shift multiplexing There is a method of multiplexing records while moving the storage medium.

As mentioned above, the holographic optical information storage device irradiates the reference light and the signal light to the storage medium at different angles, and when regenerating the light, the reference light is incident on the storage medium and diffracted from the storage medium to the opposite side to the optical information detector. Detect and play back data. The prior art of the holographic optical information storage device is disclosed in US Patent No. 6058232, "Volume holographic data storage system using a beam pattern from a tapered optical fiber," issued to "Byeong Ho Lee". In addition, recently disclosed US Patent Application Publication No. 2005-0007930, "Optical information recording apparatus" filed by "Hideyoshi" and the like.

An object of the present invention is to provide an optical information processing apparatus and an optical information processing unit for inputting a reference light, a signal light, and a servo control light simultaneously into an optical information storage medium to enable servo control for focusing, tracking, and angular multiplexing of the storage location of the optical information. And to provide an optical information storage medium.

An optical information processing apparatus according to the present invention for achieving the above object includes a light splitter for dividing light of a predetermined wavelength; A first servo control light divided by the optical splitter and incident on the optical information storage medium; A first light detector for detecting the first servo control light reflected from the optical information storage medium to measure a focusing state of the optical information storage medium; A second servo control light divided by the optical splitter and configured to be incident on the optical information storage medium at an angle different from that of the first servo control light; A second photodetector is provided by detecting the second servo control light reflected from the optical information storage medium to measure an angular multiplexed position for recording or reproducing the optical information on the optical information storage medium.

A recording light splitter for dividing recording light having a wavelength different from the light into a reference light and a signal light, and guiding the reference light in the coaxial direction with the second servo control light, to the signal light divided by the recording light splitter. Optical modulator for loading signals. A reflection mirror may be provided to guide the signal light incidently in the coaxial direction with the first servo control light.

The second servo control light and the reference light may be angularly multiplexed by a rotation mirror when incident on the optical information storage medium.

The reproduction reference light incident to the reproduction information light having a wavelength different from the light in the coaxial direction with the second servo control light is incident, and the reproduction light incident to the optical information storage medium is reproduced from the optical information storage medium. The optical information detector may be provided.

The second servo control light and the reproduction light may be angularly multiplexed by a rotation mirror when incident on the optical information storage medium.

A dichroic mirror that transmits the second servo control light reflected from the optical information storage medium and reflects other lights, and detects the second servo control light that passes through the dichroic mirror. A second photodetector may be provided.

The reflective surfaces of the optical information storage medium are formed of a first reflecting portion and a second reflecting portion spaced apart from each other to form a corresponding wave shape, and a central reflecting portion formed between the first reflecting portion and the second reflecting portion, The second photodetector may control the angular multiplexing position by comparing the amount of light reflected by the first and second reflectors with the amount of light reflected by the central reflector.

An optional reflection layer is formed on the reflective surface of the optical information storage medium to reflect the signal light and the reference light, and to pass the first servo control light and the second servo control light, and the holographic optical information is provided on the selective reflection layer. A recording layer to be stored can be formed.

Position control for recording or reproducing the optical information storage medium may be performed by the first photodetector.

The first servo control light may be incident to the surface of the optical information storage medium at a right angle, and the second servo control light may be incident to the optical information storage medium at an inclined angle.

According to an aspect of the present invention, an optical information storage medium includes: a recording layer in which reference light and signal light are incident to record holographic optical information; A selective reflection layer formed below the recording layer and reflecting the reference light and the signal light and transmitting light having a different wavelength incident for servo control; A center reflection formed under the selective reflection layer and reflecting light of the different wavelengths and having a shape corresponding to each other; a central reflection formed at a central portion of the first reflection portion and the second reflection portion; A control light reflection surface having a portion is provided.

The first reflecting portion and the second reflecting portion may be formed in a wave shape in which the reflecting portions correspond to each other.

The optical information processing method according to the present invention for achieving the above object comprises the steps of injecting a second servo control light into an optical information storage medium at a different angle from the first servo control light and the first servo control light; Controlling the position of the optical information storage medium by detecting the first servo control light reflected from the optical information storage medium; And detecting the second servo control light reflected from the optical information storage medium to measure an angular multiplexed position for processing the optical information on the optical information storage medium.

Signal information having a different wavelength in which the signal is loaded in the coaxial direction with the first servo control light and reference light having a different wavelength in the coaxial direction with the second servo control light may be incident to record optical information.

The reference light having a different wavelength is incident in the coaxial direction with the second servo control light, and detecting the optical information of the reproduction light reproduced in the optical information storage medium.

The first servo control light may be incident at right angles to the surface of the optical information storage medium, and the second servo control light may be incident at an oblique angle to the optical information storage medium.

When the second servo control light is incident on the optical information storage medium, the incident angle may be multiplexed.

The detecting of the position of the optical information storage medium by the incidence of the first servo control light may detect the reflected first servo control light and perform tracking control of the optical information storage medium.

The detecting of the position of the optical information storage medium by the incident of the first servo control light may detect the reflected first servo control light and perform focusing control of the optical information storage medium.

The surface on which the second servo control light is incident on the optical information storage medium is formed to have a reflection width different according to a position, and the detecting of the second servo control light may be performed by comparing the amount of light reflected from different positions. The multiplexing position can be measured.

Hereinafter, an optical information processing apparatus, an optical information processing method, and an optical information storage medium according to an embodiment of the present invention configured as described above will be described. And the names of each component in the description of the following embodiments may be called other names in the art. However, if the functional similarity and identity thereof, even if the modified embodiment can be adopted may be equivalent configuration. In addition, the symbols added to each component is described for convenience of description. However, the contents shown in the drawings in which these symbols are described do not limit each component to the ranges in the drawings. Similarly, even if an embodiment in which the configuration on the drawings is partially modified is employed, it can be regarded as an equivalent configuration if there is functional similarity and identity.

1 is a block diagram showing an optical information processing apparatus according to an embodiment of the present invention. As shown in FIG. 1, the optical information processing apparatus according to the embodiment of the present invention includes a light source 100. The light source 100 may use a green laser having a wavelength of 514 nm or a blue laser having a wavelength of about 488 nm. The light source 100 may be understood as the recording light source 100 when recording the optical information, and may be understood as the reproduction light source 100 when the optical information is reproduced.

After the light source 100, the first light splitter 110 is installed. The first light splitter 110 transmits P-polarized light and reflects S-polarized light. In addition, the spatial light modulator 120 is installed at the position where the S-polarized light is reflected. The spatial light modulator 120 may be implemented by LCD. A second light splitter 130 is installed to reflect the signal light S loaded with the signal from the spatial light modulator 120 back to the optical information storage medium 300.

The first light splitter 110 and the spatial light modulator 120 are used at the time of recording, and do not need to be provided in the case of the reproduction-only optical information processing apparatus. In the reproduction-only optical information processing apparatus, the second optical splitter 130 may be replaced with the reflective mirror 250.

In addition, a rotation mirror 150 is installed to obliquely enter the P-polarized light provided from the light source 100 to the optical information storage medium 300. The rotating mirror 150 may use a galvano mirror. The rotation mirror 150 multiplexes the incidence angle of the reference light R in order to multiplex the angle of the reference light R.

The light passing through the second splitter 130 is then incident on the optical information storage medium 300 via the Fourier transform lens 160 in a direction perpendicular to the optical information storage medium 300. Therefore, the optical information is recorded by the inclined reference light R and the perpendicularly incident signal light S. On the other hand, in the case of reproduction only, only the reference light R is incident and the reproduced by the incident reference light R. The reproduction light is provided after being restored in the incident direction of the signal light S. FIG. Therefore, the optical information detector 140 is installed in the rear of the second light splitter 130 in the case of a reproduction-only device. The optical information detector 140 may be a charge-coupled device (CCD), a complementary metal-oxide semiconductor (CMOS), or an optical device capable of detecting other optical information.

On the other hand, in addition to the above-described optical system for recording and reproduction of the optical information is provided with a servo control optical system for servo control of light.

The servo control optical system includes a servo control light source 200. The light source 200 uses a red laser having a wavelength of 635 nm to 650 nm. And a third light splitter 210 for dividing the light provided from the light source 200 is provided. The third light splitter 210 splits the light into P-polarized light, which is then the first servo control light C1, and S-polarized light, which is then the second servo control light C2. The first servo control light C1 is polarized into S-polarized light through the half-wave plate 220 and then reflected by the first dichroic mirror 230 through which the signal light S is transmitted. Thereafter, the first servo control light C1 is incident at right angles to the optical information storage medium 300 together with the signal light S, and then is reflected back from the optical information storage medium 300 and proceeds as it is.

Therefore, since the reflected first servo control light C1 is still S-polarized light, it is reflected by the third light splitter 210, and the first servo control light C1 is reflected by the third light splitter 210. The first photodetector 240 is installed at the position. The value detected by the first photodetector 240 is used for focusing and tracking servo control of light with respect to the optical information storage medium 300.

The second servo control light C2 is reflected by the reflection mirror 250 and then reflected by the second dichroic mirror 260 installed on a path through which the reference light R travels. Thereafter, the second servo control light C2 proceeds to the rotation mirror 150 in the coaxial direction with the reference light R and is incident to the optical information storage medium 300 inclinedly. The second servo control light C2 is angularly multiplexed together with the reference light R.

On the other hand, when the second servo control light C2 and the reference light R are incident on the optical information storage medium 300, they are inclinedly reflected in opposite directions. The third dichroic mirror 270 is installed at a position where the second servo control light C2 and the reference light R are reflected. The third dichroic mirror 270 reflects the reference light R and transmits the second servo control light C2. The second photodetector 280 is installed at a position where the second servo control light C2 of the third dichroic mirror 270 has passed.

2 is a diagram schematically showing the configuration of a second photodetector in the optical information processing apparatus according to the embodiment of the present invention. The second photodetector 280 is formed of three light receiving pixels 281, 282, and 283, as shown in FIG. 2. This will be described in more detail in the optical information processing method.

Meanwhile, a filter in which a slit 290 is formed is provided between the Fourier transform lens 160 and the first dichroic mirror 230. This slit 290 is for filtering the reproduced light or the first servo control light C1 that is unnecessarily reproduced when the optical information is reproduced so that the desired reproduced light or the first servo control light C1 is finally advanced.

Hereinafter, a concept of angle multiplexing of optical information according to an embodiment of the present invention will be described. 3a, b, c, d, and e are conceptual views for explaining the angle multiplexing state of the optical information processing apparatus according to the embodiment of the present invention.

The multiplexing method of optical information according to an embodiment of the present invention is provided by angular multiplexing in a form of shift multiplexing. That is, as shown in Fig. 3A, first recording A1 is made at a predetermined position. At this time, the reference light R is incident at the first predetermined angle. Thereafter, as shown in FIG. 3B, after the optical information storage medium 300 is moved, the second recording A2 is partially overlapped and recorded in the first recording position. At this time, the reference light R is incident at the set second predetermined angle. Subsequently, as shown in FIGS. 3C and 3E, the reference light R is incident at the third and fourth predetermined angles, and each time, the reference light R is recorded before the recording A3 and A4 of the third and fourth optical information. Some of the movements in the position are continued and some overlap is recorded. Finally, as shown in FIG. 3E, the n-th optical information is recorded at the n-th position at the angle of the n (n is an integer greater than 1) th reference light.

In this way, the crosstalk noise is reduced when the optical information is reproduced than when a plurality of optical information is superimposed at one position, thereby improving the reproduction efficiency of the optical information, and recording density is higher than when recording the optical information at a completely different position. You will get better results. Such overlapping multiplexing may be performed for the entire optical information storage medium 300, or may be performed by partitioning them.

On the other hand, for this purpose, the optical information storage medium 300 has a multi-layer structure for servo control of the optical information storage medium 300.

4 is a partially cutaway perspective view illustrating an enlarged reflection surface of an optical information storage medium used in an optical information processing apparatus according to an embodiment of the present invention, and FIG. 5 is used in the optical information processing apparatus according to an embodiment of the present invention. A partial cross-sectional view showing an optical information storage medium.

The optical information storage medium 300 according to the embodiment of the present invention may be formed in the shape of a disk. As shown in FIGS. 4 and 5, the optical information storage medium 300 includes a surface plate 310 to which light first enters. The surface plate 310 is formed of polycarbonate or a functionally similar material. A recording layer 320 is formed below the surface plate 310 to store optical information. The recording layer 320 is formed of a photo-polymer or a material similar thereto.

An optional reflective layer 330 is formed under the recording layer 320. The selective reflection layer 330 reflects the reference light R and the signal light S, and transmits the first servo control light C1 and the second servo control light C2. That is, the green or blue laser reflects and the red laser transmits. To this end, the selective reflection layer 330 may be formed of an aluminum alloy based on the refractive index according to the wavelength. In addition, a λ / 4 plate (not shown) may be formed between the selective reflection layer 330 and the recording layer 320 according to the polarization state of the reference light R and the signal light S. FIG.

The central reflector 343 reflecting the first servo control light C1 and the first reflector 341 having a shape corresponding to each other while reflecting the second servo control light C2 are disposed below the selective reflection layer 330. And the control light reflecting surface 340 formed of the second reflecting portion 342. Each of the reflecting portions 341, 342 and 343 is protruded, and a reflector 350 reflecting the red laser is formed on the upper surface. In addition, the space between the selective reflection layer 330 and the space between the respective reflective parts may be filled with quartz material. Therefore, the first servo control light C1 and the second servo control light C2 are only reflected by the respective reflecting portions 341, 342 and 343.

Each of these reflecting portions 341, 342 and 343 forms one track area. That is, it forms a track shape extending in the direction in which the optical information is stored. The first reflecting unit 341 and the second reflecting unit 342 perform servo control of the storage position and the multiplexing position of the optical information along the track area, and the central reflector 343 is used to record and reproduce the optical information. It is used for the servo control of the track area and the servo control of the focusing position when storing optical information.

In addition, the central reflector 343 is formed in the form of a protruding wall having a uniform width, and the first reflecting portion 341 and the second reflecting portion 342 oppose each other with the center reflecting portion 343 as a boundary. It is formed to have a wavy wall surface corresponding to each other. Therefore, when the optical information is multiplexed n times, the width between the valleys and valleys or the mountains and mountains of the wavy first reflection portion 341 and the second reflection portion 342 may be multiplexed n times. In other words, the optical information is recorded or recorded by the angle multiplex at the angle n times between the first mountain and the mountain, and the optical information is recorded by the angle multiplexing by the angle n times between the second mountain and the mountain. Can play.

Hereinafter, an embodiment of an optical information storage method using the optical information processing device and the optical information storage medium as described above will be described.

6 is a flowchart illustrating an optical information processing method according to an embodiment of the present invention.

As shown in FIG. 6, in the optical information processing method according to an exemplary embodiment, the first servo control light C1 is incident in a direction perpendicular to the surface of the optical information storage medium 300, and the optical information storage medium ( The second servo control light C2 is incident to the side inclined direction of S300 (S10).

At this time, when the optical information is recorded, if the wavelength is different from the servo control light C1 (C2), for example, the servo control light C1 (C2) is a red laser, the signal light S and the reference light R are drawn. A laser or blue laser is incident. Then, the hologram optical information is stored in the recording layer 320 of the optical information storage medium 300 due to the interference between the reference light R and the signal light S. The optical information at this time is a high frequency component converted by the Fourier transform lens 160 with respect to binary data coded by the spatial light modulator 120.

On the other hand, when the optical information is reproduced, only the reference light R is incident together with the second servo control light C2. Of course, optical information is recorded in the recording layer 320 of the optical information storage medium 300 at this time. Therefore, the reproduction light reproduced by the reference light R is reflected by the selective reflection layer 330 of the optical information storage medium 300 and reproduced in the direction in which the signal light S is incident. The reflected regenerated light is filtered through the slit 290 and then detected by the optical information detector 140, decoded, and finally reproduced.

On the other hand, when recording and reproducing such optical information, the first servo control light C1 and the second servo control light C2 are each used as servo control for recording and reproducing the optical information.

The first servo control light C1 is used for focusing and tracking servo for the optical information storage medium 300, and the second servo control light C2 is used for position control at the angle multiplexing with respect to the optical information storage medium 300. Used for

First, the first servo control light C1 first performs accurate servo control on the tracking position. In the tracking control, the first servo control light C1 is reflected by the central reflector 343 formed on the control light reflecting surface 340 of the optical information storage medium 300. In this case, if the light reflected by the first photodetector 240 is not detected at all, the first servo control light C1 may not be reflected by the central reflector 343 or the position of the optical information storage medium 300 may be used. May be the case that the reflected light is blocked because of wrong. At this time, since the track position is not accurate, perform track servo on the system. In addition, even if the light is transmitted through the filter 290 and detected by the first photodetector 240, the track servo may not be the correct track position and the focusing position if the detected amount of light is less than or equal to the set size. Conduct. By servo control of the track, accurate focusing and track position control of the recording or reproducing position of the optical information storage medium 300 are performed (S20).

The second servo control light C2 controls the angle multiplexing position for recording or reproducing the optical information on the optical information storage medium 300. The second servo control light C2 detects the multiplexed position by using the value reflected from the control light reflecting surface 340 of the optical information storage medium 300. Since the second servo control light C2 has a wavelength different from that of the reference light R, the second servo control light C2 passes through the third dichroic mirror 270 and is detected by the second light detector 280. The second photodetector 280 is used for multiplexed position control with three light receiving pixels 281,9282 and 283 (S30).

Hereinafter, the angle multiplexing and the servo control at this time will be described in more detail.

7A and 7B illustrate a state in which the second servo control light incident at a predetermined angle in the optical information processing apparatus according to the embodiment of the present invention is reflected by the multiplexing reflector, and FIGS. 8A and 8B illustrate the present invention. In the optical information processing apparatus according to the embodiment of the present invention, the second servo control light incident at another predetermined angle is reflected by the multiplexing reflector.

First, when the incident angle of the second servo control light C2 is multiplexed, an ellipse diameter of light incident on the control light reflecting surface 340 of the optical information storage medium 300 is changed. That is, the larger the inclination angle of the incident second servo control light C2 is, the larger the incident area becomes, so that if the widths of the first reflecting portion 341 and the second reflecting portion 342 are the same, they are incident at different angles. The amount of light reflected will always vary with angle. In this case, the exact overlapping position of the optical information cannot be found, and the angular multiplexing is not properly controlled. Therefore, if the amount of light of the second servo control light C2 incident and reflected at the set position is kept the same within the set size, the multiplexed position of the optical information can be accurately controlled.

As shown in FIGS. 7A and 7B, when the second servo control light C2 enters a narrow portion of the first reflecting portion 341 and the second reflecting portion 342, the incident angle is the optical information storage medium. Since the light is incident to have a relatively small inclination angle with respect to the perpendicular direction of 300, the size of the light spot is small. In this case, the track position of the optical information storage medium 300 is between the mountains.

On the other hand, as shown in FIGS. 8A and 8B, when the second servo control light C2 is incident on the wide portions of the first reflecting portion 341 and the second reflecting portion 342, the incident angle is optical information. Since the light is incident to have a relatively large inclination angle with respect to the perpendicular direction of the storage medium 300, the size of the light spot is large. In this case, the track position of the optical information storage medium 300 is between the valley and the valley.

When the amount of light of the second servo control light C2 reflected at each position is detected by the second light detector 280, the value of the amount of light reflected and received at the other position is detected in the same manner. That is, when the incident angle of the second servo control light C2 is the smallest, the position is recorded between the mountains of the first reflecting portion 341 and the second reflecting portion 342, and is recorded when the incident angle is made larger. Is recorded to move closer to the valley of the first reflecting portion 341 and the second reflecting portion 342.

As such, when the multiplexed position of the track is controlled by the second servo control light C2 according to the incident angle of the second servo control light C2, the first reflector 341 and the second reflector 342 are reflected. The light quantity value of the second servo control light C2 always remains the same within a set range. In the case of a recording cycle between the valley and the valley or between the mountains and the mountains, the next cycle allows the optical information to be superimposed by the same angle multiplexing as the previously recorded method. Therefore, if the sum of the amounts of light in the first reflecting unit 341 and the second reflecting unit 342 at this time and the sum of the amounts of light detected by the central reflecting unit 343 are maintained at a set ratio, the servo control for angle multiplexing is performed. Will be done.

Meanwhile, the second servo control light C2 may be used for the track servo. In this case, the optical information storage medium compares the light quantity values of the second servo control light C2 reflected by the first reflecting portion 341 and the second reflecting portion 342 and keeps the light quantity values close to each other. Tilting control of the 300 may also control the track position of the optical information.

The optical information processing apparatus, the optical information processing method, and the optical information storage medium according to the embodiment of the present invention as described above may be implemented differently by modifying a part or part of a method by those skilled in the art. The components used for recording the optical information may be deleted and used exclusively for optical information reproduction, or the components used for optical information reproduction may be deleted and the optical information recording only. However, all other modified embodiments include the essential elements of the present invention should be considered to be included in the technical scope of the present invention.

The optical information processing apparatus, the optical information processing method, and the optical information storage medium according to the present invention perform partial overlapping recording of optical information, and for this purpose, an effective angle multiplexing method is adopted, and these overlapping recording and angle multiplexing methods Track, focusing, and multiplexing servo control can be made with a minimum optical system, thereby improving optical recording efficiency, multiplexing efficiency, and reproducing efficiency.

Claims (20)

An optical splitter dividing light having a predetermined wavelength; A first servo control light divided by the optical splitter and incident on the optical information storage medium; A first light detector for detecting the first servo control light reflected from the optical information storage medium to measure a focusing state of the optical information storage medium; A second servo control light divided by the optical splitter and configured to be incident on the optical information storage medium at an angle different from that of the first servo control light; And detecting a second servo control light reflected from the optical information storage medium to measure an angle multiplexing position for recording or reproducing the optical information on the optical information storage medium. Optical information processing device. The recording optical splitter according to claim 1, further comprising: a recording light splitter for dividing recording light having a wavelength different from the light into a reference light and a signal light and guiding the reference light in the coaxial direction with the second servo control light And a signal for loading a signal into the signal light divided by the recording optical splitter. And a reflection mirror for guiding the signal light in the coaxial direction with the first servo control light. 3. The optical information processing apparatus according to claim 2, wherein the second servo control light and the reference light are angularly multiplexed by a rotation mirror when incident on the optical information storage medium. The optical information storage medium of claim 1, wherein the reproduction light having a wavelength different from that of the light is incident to the reproduction reference light incident in the coaxial direction with the second servo control light, and is incident on the optical information storage medium. And an optical information detector for detecting the reproduced light reproduced in the system. The optical information processing apparatus according to claim 4, wherein the second servo control light and the reproduction reference light are angularly multiplexed by a rotation mirror when incident on the optical information storage medium. The dichroic mirror according to any one of claims 2 to 4, wherein the dichroic mirror transmits the second servo control light reflected from the optical information storage medium and reflects other lights. And a second photodetector for detecting the second servo control light passing through the lower mirror. The reflective surface of the optical information storage medium is spaced apart from each other and forms a corresponding wave shape, the center formed between the first reflecting portion and the second reflecting portion. And a second photodetector configured to compare the amount of light reflected by the first and second reflectors with the amount of light reflected by the central reflector to control the angular multiplexing position. Processing unit. 8. The selective reflection layer of claim 7, wherein an optional reflective layer is formed on the reflective surface of the optical information storage medium to reflect the signal light and the reference light, and to pass the first servo control light and the second servo control light. And a recording layer on which holographic optical information is stored. 9. An optical information processing apparatus according to claim 8, wherein position control for recording or reproducing the optical information storage medium is performed by the first photodetector. The light of claim 1, wherein the first servo control light is incident on the surface of the optical information storage medium at a right angle, and the second servo control light is incident on the optical information storage medium at an inclined angle. Information processing device. A recording layer in which reference light and signal light are incident to record holographic optical information; A selective reflection layer formed below the recording layer and reflecting the reference light and the signal light and transmitting light having a different wavelength incident for servo control; A center reflection formed under the selective reflection layer and reflecting light of the different wavelengths and having a shape corresponding to each other; a central reflection formed at a central portion of the first reflection portion and the second reflection portion; And a control light reflecting surface having a portion. 12. The optical information storage medium of claim 11, wherein the first reflecting portion and the second reflecting portion are formed in a wave shape in which reflecting portions correspond to each other. Injecting a second servo control light into an optical information storage medium at a different angle from the first servo control light and the first servo control light; Controlling the position of the optical information storage medium by detecting the first servo control light reflected from the optical information storage medium; And detecting the second servo control light reflected from the optical information storage medium to measure an angular multiplexed position for processing the optical information on the optical information storage medium. 15. The method of claim 13, wherein signal light having a different wavelength in which the signal is loaded in the coaxial direction with the first servo control light and reference light having a different wavelength in the coaxial direction with the second servo control light are incident to record optical information. Optical information processing method characterized in that. 14. The processing method according to claim 13, further comprising the step of detecting optical information of reproduction light reproduced on the optical information storage medium by receiving reference light having a different wavelength in the coaxial direction with the second servo control light. . 14. The light of claim 13, wherein the first servo control light is incident at right angles to the surface of the optical information storage medium, and the second servo control light is incident at an oblique angle to the optical information storage medium. Information processing method. 17. The optical information processing method according to any one of claims 13 to 16, wherein the second servo control light is multiplexed when the incident light is incident on the optical information storage medium. The method of claim 13, wherein the controlling of the position of the optical information storage medium by the incidence of the first servo control light comprises detecting the reflected first servo control light to perform tracking control of the optical information storage medium. Optical information processing method characterized in that. The method of claim 13, wherein the controlling of the position of the optical information storage medium by the incidence of the first servo control light comprises detecting the reflected first servo control light to perform focusing control of the optical information storage medium. Optical information processing method characterized in that. 15. The method of claim 13, wherein the surface on which the second servo control light is incident on the optical information storage medium is formed to have a different reflection width according to a position, and the detecting of the second servo control light is reflected at another position. Optical information processing method characterized in that to measure the angle multiplexed position by comparing the amount of light.

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