KR20100037495A - Apparatus and method for reproducing optical information - Google Patents

Apparatus and method for reproducing optical information Download PDF

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Publication number
KR20100037495A
KR20100037495A KR1020080096840A KR20080096840A KR20100037495A KR 20100037495 A KR20100037495 A KR 20100037495A KR 1020080096840 A KR1020080096840 A KR 1020080096840A KR 20080096840 A KR20080096840 A KR 20080096840A KR 20100037495 A KR20100037495 A KR 20100037495A
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KR
South Korea
Prior art keywords
optical information
storage medium
information storage
servo
track
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Application number
KR1020080096840A
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Korean (ko)
Inventor
정규일
Original Assignee
주식회사 대우일렉트로닉스
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Priority to KR1020080096840A priority Critical patent/KR20100037495A/en
Publication of KR20100037495A publication Critical patent/KR20100037495A/en

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0065—Recording, reproducing or erasing by using optical interference patterns, e.g. holograms
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
    • G11B7/00772—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track on record carriers storing information in the form of optical interference patterns, e.g. holograms
    • G11B7/00781—Auxiliary information, e.g. index marks, address marks, pre-pits, gray codes
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/083—Disposition or mounting of heads or light sources relatively to record carriers relative to record carriers storing information in the form of optical interference patterns, e.g. holograms
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0901—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following only
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0938—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following servo format, e.g. guide tracks, pilot signals

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  • Holo Graphy (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE: An optical information reproduction device and a method are provided to decrease a tracking error and to increase the recording capacity of an optical information storage medium by using a minimum number of servo patterns. CONSTITUTION: An optical information reproduction device comprises a reproductive optical system and a servo system. The reproductive optical system produces reproduction light by radiating light onto an optical information storage medium, including a plurality of holograms, on its track and detecting the reproduction light. The servo system detects the disturbance signal of the track for 1 rotation of the optical information storage medium, estimates the location of the holograms on the track from the disturbance signal, and controls the location of the light radiated onto the optical information storage medium from the reproductive optical system. The optical information storage medium comprises a plurality of tracks, each of which comprises a plurality of servo patterns. A plurality of holograms is stored between the servo patterns of the track.

Description

Apparatus and method for reproducing optical information}

The present invention relates to an optical information reproducing apparatus and a reproducing method, and more particularly, to an apparatus and a reproducing method for reproducing an optical information storage medium containing holographic data.

Among optical information processing apparatuses for processing optical data is a holographic optical information processing apparatus. When the holographic optical information processing apparatus records data, the optical modulated signal beam and reference beam intersect at a predetermined position of the optical information storage medium, and the interference pattern generated at this time is optically intersected. Store in an information storage medium. In addition, reproduction of the stored data irradiates only the reference light to the interference pattern stored in the optical information storage medium, and restores the original data by using the diffraction image generated by the interference pattern.

The optical information storage medium can be configured in various forms, but at the present time, in consideration of problems of convenience and compatibility with existing devices, a disk-type similar to the conventional CD (Compact Disk) or DVD (Digital Versatile Disk) Disk form is common.

A plurality of tracks are formed along the rotation direction on the optical information storage medium, and interference patterned data is recorded in each track.

In the holographic optical information processing apparatus, when the optical information is processed, light that is incident on the optical information storage medium cannot be accurately reproduced unless the light is incident to the correct position of the hologram. Therefore, there is a need for correction to accurately position the light incident through the tracking servo.

An object of the present invention is to provide an optical information reproducing apparatus and an optical information reproducing method which performs a tracking servo when optical information is reproduced by the optical information reproducing apparatus.

An optical information reproducing apparatus according to the present invention includes a reproducing optical system for generating regenerated light by injecting light into an optical information storage medium including a plurality of holograms in a track and detecting the regenerated light; Detect the disturbance signal of the track for one rotation period of the optical information storage medium, estimate the position of the holograms of the track from the disturbance signal, and control the position of the light incident on the optical information storage medium in the reproduction optical system A servo system is provided.

The optical information storage medium may include a plurality of tracks, each track may include a plurality of servo patterns, and may include a plurality of holograms between the servo patterns of the tracks.

The optical information storage medium may be a holographic optical information storage medium, and the track may be the outermost track of the optical information storage medium.

The detecting of the disturbance signal in the servo system may include detecting the servo pattern located on the track of the optical information storage medium.

The estimation of the positions of the holograms in the servo system is to filter the disturbance signal with a low pass filter and to estimate the sine wave having the same period as one rotation period of the optical information storage medium among the filtered signals. Can be.

The optical information reproducing method according to the present invention comprises detecting a disturbance signal for one rotation period of the optical information storage medium with respect to a track of the optical information storage medium on which a plurality of holograms are recorded, and detecting the disturbance signal from the detected disturbance signal. Estimating the positions of the holograms and generating the reproduction light by injecting light into the estimated positions of the holograms, and detecting the reproduction light to reproduce the optical information.

The servo system of the optical information reproducing apparatus according to the present invention comprises: a servo light source for emitting servo servo light; A servo light detector for detecting the servo light incident on the track to an optical information storage medium including a plurality of holograms and reflected from the optical information storage medium; An error estimator which receives the signal detected by the servo light detector and generates a disturbance signal of the track for one rotation period of the optical information storage medium, and estimates the positions of the holograms of the track from the disturbance signal; And a position adjuster configured to receive a control signal from the error estimator, generate light by injecting light into an optical information storage medium, and move a position of a reproduction optical system that detects the reproduction light.

The servo method of the optical information reproducing apparatus according to the present invention comprises the steps of: detecting the servo light reflected from the optical information storage medium after injecting the servo light from the servo light source into the optical information storage medium including a plurality of holograms; And generating a disturbance signal of the track for one rotation period of the optical information storage medium using the detected servo light, and estimating the positions of the holograms of the track from the disturbance signal.

In the optical information reproducing apparatus and the optical information reproducing method according to the present invention, a tracking servo can be performed even in a part without a servo pattern in the optical information storage medium, thereby reducing the tracking error, and by using a minimum servo pattern, There is an effect that the recording capacity can be increased.

Hereinafter, an optical information reproducing apparatus, a reproducing method, a servo system, and a servo method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

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

Referring to FIG. 1, an optical information reproducing apparatus includes a reproducing optical system 110 and a servo system 120.

The reproduction optical system 110 includes a light source 111, objective lenses 112 and 113, and a reproduction light detector 114. The reproducing optical system 110 receives the reference light used to record the optical information to the hologram of the optical information storage medium 130, and detects the reproduced light diffracted in the hologram. The detected reproduction light is reproduced as original optical information through a series of signal processing and decoding processes.

The light source 111 may use a green laser. The objective lenses 112 and 113 may be convex lenses. The reproduction light detector 114 is configured of a light receiving array element such as a complementary metal-oxide semiconductor (CMOS) or a charge coupled device (CCD) to detect the reproduction light.

The servo system 120 includes a servo light source 121, a polarization beam splitter 122, a dichroic mirror 123, a wavelength plate 124, and a servo light detector 125. And an error estimator 126 and a position adjuster 127.

The servo system 120 moves the reproducing optical system 110 so that the reference light irradiated from the light source 111 of the reproducing optical system 110 is irradiated to the correct position where the hologram of the optical information storage medium 130 is located. Adjust it. In this embodiment, the case where the reference light incident position is adjusted by moving the reproducing optical system 110 is not limited, and the optical information storage medium 130 may be moved by the spindle motor 140.

The servo light source 121 may use a red laser light having a wavelength of 635 nm to 650 nm. The servo light irradiated from the servo light source 121 passes through the polarized light splitter 122 and becomes light in a P-polarized state. The servo light then proceeds to the dichroic mirror 123. The dichroic mirror 123 has a property of transmitting or reflecting according to the frequency of light. The dichroic mirror 123 passes the green laser light having a high frequency and reflects the red laser light having a low frequency. Accordingly, the servo light may be reflected by the dichroic mirror 123 and travel coaxially with the reference light of the reproduction optical system 110. The servo light is changed into circular polarization while passing through the 1/4 wavelength plate 124. Servo light changed into circularly polarized light is incident on the optical information storage medium 130 via the objective lens 114.

Servo light incident on the optical information storage medium 130 is reflected in the servo area of the optical information storage medium 130, for example, where the servo pattern is located, and is transmitted in the area where the holograms for recording data are located.

The servo pattern of the optical information storage medium will be described later. The servo light reflected by the servo pattern is changed from circularly polarized light to S-polarized light while passing through the objective lens 112 and the 1/4 λ wave plate 124. Servo light changed to S-polarized light is reflected from the dichroic mirror 123 and proceeds to the polarized light splitter 122. Thereafter, the servo light is reflected by the polarized light splitter 122 and then incident to the servo light detector 125.

The servo light detector 125 detects the light intensity of the servo light reflected by the polarized light splitter 122 and may be configured as a photo diode. In addition, the detection region of the servo light detector 125 may be divided into a plurality, for example, may be composed of four detection regions.

The error estimator 126 receives the detection signal for the servo light from the servo light detector 125 and generates a disturbance signal of the track for one rotation period of the optical information storage medium 130. Here, the track may be the outermost track of the optical information storage medium 130. However, this is not a limitation and other tracks are possible.

For convenience of explanation, the disturbance signal of the track for one rotation period of the optical information storage medium 130 will be referred to as a tracking error signal. The tracking error signal indicates the degree to which the reference light incident from the light source 111 of the reproduction optical system 110 to the track of the optical information storage medium 130 deviates from the correct position of the track (for example, the center of the track).

The error estimator 126 also estimates the positions of the holograms of the track from the generated tracking error signal and generates an estimate. The error estimator 126 selects one of the tracking error signal and an estimated value representing the estimated positions of the holograms and provides the position adjuster 127 as a control signal.

The position adjuster 127 adjusts the position of the reproduction optical system 110 with the control signal provided from the error estimator 126. The position controller 127 is also called an actuator, and may employ a piezoelectric element, a small linear motor, or the like.

2 is a diagram illustrating an example of an optical information storage medium 130 according to an embodiment of the present invention, and FIG. 3 is an enlarged view of part I shown in FIG. 2. FIG. 4 is an enlarged view of part II shown in FIG. 3.

2 to 4, in the optical information storage medium 130, for example, a holographic digital data storage (HDDS) using a holographic form, a clamping hole 21 is formed at a center of the optical information storage medium 130. It is provided in the form of a disk (disk). The optical information storage medium 130 includes a plurality of tracks 22 whose radius is extended to the outer circumferential side of the optical information storage medium 130 with respect to the clamping hole 21. At this time, the track with the largest radius is called the outermost track.

Each track 22 may be divided into a plurality of sectors 23. The sector 23 means one of the sectors in which the track is divided into sectors. Although the size of each sector 23 is the same in this embodiment, the size of each sector 23 may be different. Each sector 23 may be composed of a servo area 30 and an information recording area 31.

The servo area 30 may include information for generating a basic clock (not shown), position reset information, address information, information for performing a tracking servo, and the like. Can be.

The position reset information may be used to find the reference point of the track. The address information may indicate a track number, a sector number, and the number of data pages to be described later. The information for performing the tracking servo may be a servo pattern 41.

Here, the tracking servo means correcting the position of the reproducing optical system 110 so that the light emitted from the light source 111 of the reproducing optical system 110 can be accurately incident on the track 22 of the optical information storage medium 130. do. In this embodiment, the position of the reproduction optical system 110 is corrected. However, this is not a limitation, and the optical information reproducing medium 130 may be moved.

The shape of the servo pattern 41 is not limited and may be determined from any pattern. Since the servo light is reflected in the servo region 30, the servo system 120 can detect the position reset information, the address information, the information for performing the tracking servo, and the like present in the servo region 30.

The information recording area 31 is an area for storing data. For example, a plurality of data pages 32 for storing holograms may exist. The servo light is transmitted through the information recording area 31 without being reflected.

5 is a diagram illustrating a method of detecting servo light reflected from a servo pattern 41 of the optical information storage medium 130 by the servo light detector 125 of the servo system 120 according to an embodiment of the present invention.

Referring to FIG. 5, the servo light detector 125 is a quadrant photodetector having four light receiving regions. In this case, the four light receiving regions are referred to as A, B, C, and D, respectively, and the signals received in each light receiving region and converted into electrical signals are called Sa, Sb, Sc, and Sd. In this case, Sa, Sb, Sc, and Sd are signals proportional to the image of the servo pattern detected in each light receiving area.

For example, when five sectors exist in the outermost track of the optical information storage medium 130, five servo patterns SP may exist in the track. If the servo pattern is SP1, SP2, SP3, SP4, or SP5 in the tracking direction, respectively, SP1 to SP5 are servo light in the order of FIGS. 5A to 5E while the optical information storage medium 130 is rotated once. Can be detected at the detector 125. The servo light detector 125 then provides the above-described Sa, Sb, Sc, and Sd signals to the error estimator 126.

When the reproducing optical system 110 is accurately positioned on the outermost track of the optical information storage medium 130, the servo pattern image is detected as shown in FIG. On the other hand, when the reproduction optical system 110 is out of the outermost track, the servo pattern is detected as shown in FIGS. 5A, 5B, 5C, and 5D.

As described above, the servo light detector 125 of the servo system 120 detects and provides the servo light reflected from the servo pattern of the track to the error estimator 126. In addition, the servo light detector 125 also detects address information in the servo region where the servo pattern is located and provides it to the error estimator 126.

Hereinafter, the error estimator 126 of the servo system 120 generates a disturbance signal (ie, a tracking error signal) of a track for one rotation period of the optical information storage medium 130, and estimates the positions of the holograms of the track. The method will be described in detail.

6 is a block diagram showing the detailed configuration of the error estimator 126 according to an embodiment of the present invention. 7 is a graph illustrating various signals generated by the error estimator 126 according to an embodiment of the present invention. For convenience, hereinafter, a signal for estimating the position of the hologram generated by the error estimator 126 is referred to as an estimated compensation signal.

6 and 7, the error estimator 126 may include a memory 63, a low pass filter 64, and an operation processor 65.

The memory unit 63 includes a first memory 61 that stores a tracking error signal, and a second memory 62 that stores an estimated correction signal generated by the calculation processor 65 to be described later.

The calculation processor 65 receives the Sa, Sb, Sc, and Sd signals of the track pattern from the servo light detector 125 and the address information of the servo pattern to generate a tracking error signal. In addition, an estimated correction signal is generated using the tracking error signal.

For example, the tracking error signal may be generated as a signal proportional to the value after calculating the Sa, Sb, Sc, and Sd signals as (Sa + Sb)-(Sc + Sd). When the reproduction optical system 110 is accurately positioned on the track of the optical information storage medium 130, since the servo pattern image is detected as shown in (e) of FIG. 5, the values of (Sa + Sb)-(Sc + Sd) are 0. Becomes In this case, the tracking error signal is also zero.

On the other hand, when the reproduction optical system 110 is out of the track, since the servo pattern image is detected as shown in FIGS. 5A, 5B, 5C, and 5D, (Sa + Sb) − (Sc + Sd). ) Is not zero and has a magnitude and a sign. Therefore, it can be seen from the tracks of the reproduction optical system from the values of (Sa + Sb)-(Sc + Sd). In other words, the tracking error signal indicates how far off the track the playback optics are at the position of the servo pattern.

Although it is considered in the Y direction in FIG. 5, it can also consider in the X direction by the same principle. Here, the Y direction is the outermost track direction in the clamping hole 21 of the optical information storage medium, and the X direction is the tracking direction.

The calculation processing unit 65 stores the tracking error signal (see (f)) in the first memory 61 with reference to the address information. In addition, the operation processor 65 filters the generated tracking error signal using a low pass filter 64. Thereafter, the arithmetic processing unit 65 selects a sine wave having a period equal to one rotation period of the optical information storage medium 130 from the signal after the filtering. From this selected sine wave, the positions of the plurality of holograms between the servo patterns in the track of the optical information storage medium 130 are estimated.

For example, suppose there are six data pages between the servo patterns SP1 and SP2 of the outermost track and a hologram in each data page. Then, six values are sampled at equal intervals in the sections corresponding to the servo patterns SP1 and SP2 of the sine wave (see (g)) to estimate positions of the six holograms (see (h)). The positions of the holograms are estimated in the same manner between the servo patterns SP2 and SP3, the servo patterns SP3 and SP4, and the servo patterns SP4 and SP5.

In other words, a tracking error signal is generated by using the servo patterns SP1 to SP5 in the outermost track, and the positions of the holograms located between the servo patterns are estimated from the sine wave obtained by filtering the tracking error signal. . This can be seen as generating an estimated correction signal by interpolating a tracking error signal using the sine wave.

In the holographic optical information processing apparatus, the rotation correction speed of the optical information storage medium 130 is very slow in the case of the holographic optical information processing device. It can be ignored and takes advantage of the fact that when the optical information storage medium 130 rotates, a repetitive tracking error signal is generated with one rotation time.

Thereafter, the calculation processing unit 65 stores the estimated correction signal in the second memory 62.

The calculation processor 65 outputs a tracking error signal stored in the first memory 61 to the position controller 127 as a control signal with respect to the servo region 30 of the optical information storage medium 130 with reference to the address information. In the information recording area 31, the estimated correction signal stored in the second memory 62 is output to the position adjusting unit 127 as a control signal.

The position adjusting unit 127 receives a control signal from the calculation processing unit 65 and adjusts the position of the reproduction optical system 110 to perform tracking servo.

Hereinafter, a servo method of the optical information reproducing apparatus according to an embodiment of the present invention will be described in detail.

8 is a flowchart illustrating a servo method of an optical information reproducing apparatus according to an embodiment of the present invention.

1 to 8, when the optical information storage medium 130 is inserted into the optical information reproducing apparatus, the optical information storage medium 130 is rotated in a direction opposite to tracking by the spindle motor 140. Then, the servo light source 121 of the servo system 120 irradiates the servo light and the irradiated servo light is irradiated to the optical information storage medium 130 and reflected in the servo region 30. The servo light detector 125 of the servo system 120 detects the servo pattern 41 of the optical information storage medium 130 while the optical information storage medium 130 rotates a predetermined number of times. A tracking error signal for one rotation period of the information storage medium 130 is generated (S80).

The error estimator 126 stores the generated tracking error signal in the first memory 61 and then filters the stored tracking error signal with a low pass filter 64 to generate an estimated compensation signal. The method of generating the estimated correction signal is as described above.

The error estimator 126 also stores the estimated correction signal in the second memory 62. The error estimator 126 selects one of the tracking error signal and the estimated correction signal with reference to the address information and provides the position adjuster 127 as a control signal (S81).

The position controller 127 adjusts the position of the reproducing optical system 110 using the provided control signal (S82).

According to the present invention described above, accurate servo control is possible even in the information recording region 31 in which the optical information storage medium 130 does not have a servo pattern, and the number of servo patterns can be reduced, thereby recording the optical information storage medium 130. Capacity can be increased.

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

2 is a block diagram showing an example of an optical information storage medium 130 according to an embodiment of the present invention.

FIG. 3 is an enlarged view of part I shown in FIG. 2.

FIG. 4 is an enlarged view of part II shown in FIG. 3.

5 is a diagram illustrating a method of detecting servo light reflected from a servo pattern 41 of the optical information storage medium 130 by the servo light detector 125 of the servo system 120 according to an embodiment of the present invention.

6 is a block diagram showing the detailed configuration of the error estimator 126 according to an embodiment of the present invention.

7 is a graph illustrating a tracking error signal generated by the error estimator 126 and a signal for estimating the position of the hologram according to an exemplary embodiment of the present invention.

8 is a flowchart illustrating a servo method of an optical information reproducing apparatus according to an embodiment of the present invention.

<Description of Signs of Major Parts of Drawings>

110: reproducing optical system 120: servo system

130: optical information storage medium

Claims (24)

A reproducing optical system for generating regenerated light by injecting light into an optical information storage medium including a plurality of holograms in a track, and detecting the regenerated light; Detect the disturbance signal of the track for one rotation period of the optical information storage medium, estimate the position of the holograms of the track from the disturbance signal, and control the position of the light incident on the optical information storage medium in the reproduction optical system And a servo system. The optical information reproducing apparatus according to claim 1, wherein the optical information storage medium includes a plurality of tracks, each track includes a plurality of servo patterns, and a plurality of holograms between the servo patterns of the tracks. Device. The optical information reproducing apparatus according to claim 1, wherein the optical information storage medium is a holographic optical information storage medium. The optical information reproducing apparatus according to claim 1, wherein the track is an outermost track of the optical information storage medium. The optical information reproducing apparatus according to claim 1, wherein the detecting of the disturbance signal in the servo system is performed by detecting a servo pattern located on the track of the optical information storage medium. The method of claim 1, wherein estimating the positions of the holograms in the servo system filters the disturbance signal with a low pass filter, and performs a period equal to one rotation period of the optical information storage medium among the filtered signals. The optical information reproducing apparatus, characterized in that the branch is estimated from a sine wave. Detecting a disturbance signal for one rotation period of the optical information storage medium with respect to a track of the optical information storage medium having a plurality of holograms recorded thereon; Estimating the position of holograms of the track from the detected disturbance signal; And And generating light by injecting light into the estimated positions of the holograms, and detecting the reproduced light to reproduce the light information. 8. The optical information reproducing apparatus according to claim 7, wherein the optical information storage medium has a plurality of tracks, each track has a plurality of servo patterns, and a plurality of holograms between the track patterns of the tracks. Way. 8. The method of claim 7, wherein the optical information storage medium is a holographic optical information storage medium. The optical information reproducing method according to claim 7, wherein the track is an outermost track of the optical information storage medium. The optical information reproducing method according to claim 7, wherein the detecting of the disturbance signal is performed by detecting a servo pattern located on the track of the optical information storage medium. The method of claim 7, wherein the estimating of the positions of the holograms comprises filtering the disturbance signal with a low pass filter and having a period equal to one rotation period of the optical information storage medium among the filtered signals. Optical information reproducing method characterized by estimating from a sine wave. A servo light source for emitting servo light; A servo light detector for detecting the servo light incident on the track to an optical information storage medium including a plurality of holograms and reflected from the optical information storage medium; An error estimator which receives the signal detected by the servo light detector and generates a disturbance signal of the track for one rotation period of the optical information storage medium, and estimates the positions of the holograms of the track from the disturbance signal; And A positioner that receives a control signal from the error estimator, injects light into an optical information storage medium to generate regenerated light, and moves a position of the reproducing optical system that detects the regenerated light; . The optical information reproducing apparatus according to claim 13, wherein the optical information storage medium includes a plurality of tracks, each track includes a plurality of servo patterns, and a plurality of holograms between the servo patterns of the tracks. Servo system of the device. 15. The servo system of claim 13, wherein the optical information storage medium is a holographic optical information storage medium. The servo system of claim 13, wherein the track is an outermost track of the optical information storage medium. The servo system of claim 13, wherein the detecting of the disturbance signal by the servo light detector is performed by detecting a servo pattern located on the track of the optical information storage medium. The method of claim 13, wherein estimating the positions of the holograms in the error estimator filters the disturbance signal with a low pass filter, and performs a period equal to one rotation period of the optical information storage medium among the filtered signals. A servo system of an optical information reproducing apparatus, characterized in that the branch is estimated from a sine wave. Injecting the servo light from the servo light source into the optical information storage medium including a plurality of holograms in the track, and detecting the servo light reflected from the optical information storage medium; and Generating a disturbance signal of the track for one rotation period of the optical information storage medium using the detected servo light, and estimating the positions of the holograms of the track from the disturbance signal; Servo method. 20. The optical information reproducing apparatus according to claim 19, wherein the optical information storage medium includes a plurality of tracks, each track includes a plurality of servo patterns, and a plurality of holograms between the servo patterns of the tracks. Servo method of the device. 20. The servo method of claim 19, wherein the optical information storage medium is a holographic optical information storage medium. 20. The servo method according to claim 19, wherein the track is an outermost track of the optical information storage medium. 20. The servo method according to claim 19, wherein the disturbance signal is generated from a signal of detecting a servo pattern located on the track of the optical information storage medium. 20. The method of claim 19, wherein estimating the positions of the holograms comprises filtering the disturbance signal with a low pass filter, and from the sine wave having a period equal to one rotation period of the optical information storage medium among the filtered signals. A servo method of an optical information reproducing apparatus, characterized by estimating.
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