CN100582965C - Optical information reproducing apparatus and optical information reproducing method using the same - Google Patents
Optical information reproducing apparatus and optical information reproducing method using the same Download PDFInfo
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- CN100582965C CN100582965C CN200710089190A CN200710089190A CN100582965C CN 100582965 C CN100582965 C CN 100582965C CN 200710089190 A CN200710089190 A CN 200710089190A CN 200710089190 A CN200710089190 A CN 200710089190A CN 100582965 C CN100582965 C CN 100582965C
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47K—SANITARY EQUIPMENT NOT OTHERWISE PROVIDED FOR; TOILET ACCESSORIES
- A47K3/00—Baths; Douches; Appurtenances therefor
- A47K3/10—Wave-producers or the like, e.g. with devices for admitting gas, e.g. air, in the bath-water
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
- A61H23/00—Percussion or vibration massage, e.g. using supersonic vibration; Suction-vibration massage; Massage with moving diaphragms
- A61H23/04—Percussion or vibration massage, e.g. using supersonic vibration; Suction-vibration massage; Massage with moving diaphragms with hydraulic or pneumatic drive
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
- E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
- E03C1/02—Plumbing installations for fresh water
- E03C1/08—Jet regulators or jet guides, e.g. anti-splash devices
- E03C1/084—Jet regulators with aerating means
Abstract
An optical information reproducing apparatus and an optical information reproducing method using the same are provided. The optical information reproducing apparatus includes: a reference beam providing unit which inputs a reference beam to a reproduction recording area to be reproduced and a peripheral recording area around the reproduction recording area on an optical information recording medium, a peripheral beam detecting unit which transmits a reproduction beam reproduced from the reproduction recording area in response to the reference beam and detects a peripheral beam reproduced from the peripheral recording area, a tracking servo unit which analyzes optical information of the detected peripheral beam and controls a tracking position, and a reproduction beam detecting unit which detects the reproduction beam having pass through the peripheral beam detecting unit. Accordingly, it is possible to judge a current tracking state using the peripheral beam and to perform a tracking servo control process using the judgment result at the time of reproducing optical information.
Description
Technical field
The present invention relates to a kind of optical information reproduction equipment and use its optical information reproduction method, relate more specifically to a kind of like this optical information reproduction equipment and optical information reproduction method, this optical information reproduction equipment can use near the optical information of the peripheral light beam (peripheral beam) reconstruction beam to be reproduced and control tracing positional when reproduction optical information.
Background technology
Usually, as the optical data recording device that is used for storing optical information, known compact disk (CD), digital versatile disc (DVD), high definition DVD (HD-DVD) and Blu-ray Disc (BD).
Along with developing rapidly of information and computer industry in recent years, need to satisfy the storage system of future generation of large storage capacity and high-speed data input and output ability.
One of system that addresses that need and come into one's own is for utilizing the optical information processing system of body holographic technique principle, i.e. holographic optics information handling system.
This holographic optics information handling system is based on following principle and designs: two light beams with different incidence angles are being intersected, the interference figure that is formed by the interference of two light beams with record in this light-sensitive medium to the pre-position on the light-sensitive medium of light beam sensitivity.
Promptly, the such interference figure of record on as the optical data recording medium of light-sensitive medium, this interference figure are to form by the signal beams that comprises data message and the pre-position of reference beam on this optical data recording medium with the angular illumination that is different from this signal beams are intersected each other.When reproduction optical information, use the diffraction image that generates from this interference figure to the interference figure irradiation reference beam that writes down by only, and recover raw data.
This holographic optics information handling system by using multiple multiplexing method in the mode of three-dimensional at the same position of optical data recording medium record data repeatedly.By adopting this recording processing repeatedly, can increase the storage capacity of optical data recording medium significantly, thereby realize the storage system of vast capacity with limited area.
The example of multiplexing method can comprise angular multiplexed method, phase-code multiplexed method, wavelength multiplexing method, fractal multiplexing method, displacement multiplexing method, multiplexing (peristrophic multiplexing) method of rotation and multiple domain multiplexing (polytopic multiplexing) method.
This holographic optics information handling system is studied, thereby by suitably using these multiplexing methods to increase data recording density.For example, this holographic optics information handling system is operated like this: increase the density of signal beams when record data, and make reconstruction beam transmission to be reproduced stop other peripheral light beam by the beam splitter that wherein is formed with through hole.
Yet, because will allow the through hole of reconstruction beam, so this holographic optics information handling system is to the environmental change sensitivity such as vibration equipment by beam splitter.
Therefore, need tracking servo control and treatment accurately.That is, need such processing: whether check from the track of expectation to detect reconstruction beam exactly, and correctly not handling by servocontrol during positioning track positioning track correctly.
When suitably not carrying out the tracking servo control and treatment, reconstruction beam to be reproduced can not obtain correct optical information image by slit and beam detector, thereby the rate that leads to errors increases.Therefore, be starved of the technology that when reproducing holographic optics information, can carry out the tracking Control processing accurately and effectively.
Summary of the invention
Make the present invention in order to address the above problem.First advantage of some aspects of the present invention is to provide a kind of optical information reproduction equipment, and this optical information reproduction equipment can carry out effective tracking servo control and treatment by the optical information of using peripheral light beam and reproduce optical information accurately when reproduction optical information.
Second advantage of some aspects of the present invention has been to provide a kind of following servo controller of optical information reproduction equipment, and this following servo controller can detect the tracking servo control information by the optical information of using peripheral light beam when reproduction optical information.
The 3rd advantage of some aspects of the present invention is to provide a kind of optical information reproduction method, and this optical information reproduction method can be controlled tracing positional by the optical information of using peripheral light beam when reproduction optical information.
According to an aspect of the present invention, a kind of optical information reproduction equipment is provided, this optical information reproduction equipment comprises: reference beam provides the unit, and this reference beam provides the to be reproduced reproduction recording areas of unit on optical data recording medium and the peripheral recording areas input reference beam around this reproduction recording areas; Peripheral light beam detecting unit, this peripheral light beam detecting unit make the reconstruction beam transmission of reproducing from described reproduction recording areas in response to described reference beam, and detect the peripheral light beam that reproduces from described peripheral recording areas; The tracking servo unit, tracing positional is analyzed and controlled in this tracking servo unit to the optical information of detected peripheral light beam; And reconstruction beam detecting unit, this reconstruction beam detecting unit detects the reconstruction beam that has passed described peripheral light beam detecting unit, wherein, described peripheral light beam detecting unit has the optical detection zone of the division that is used to detect described peripheral light beam, and wherein, described tracking servo unit is by determining tracing positional to comparing mutually from the detected beam intensity of the optical detection zone of each described division.
According to a further aspect in the invention, a kind of optical information reproduction method is provided, and this optical information reproduction method comprises the steps: reproduction recording areas to be reproduced on optical data recording medium and the peripheral recording areas input reference beam around this reproduction recording areas; Make the reconstruction beam transmission of reproducing from described reproduction recording areas pass through the peripheral light beam detecting unit, and detect the peripheral light beam that reproduces from described peripheral recording areas in response to described reference beam; Tracing positional is analyzed and controlled to the optical information of detected peripheral light beam; And the reconstruction beam of described peripheral light beam detecting unit has been passed in detection, wherein, described peripheral light beam detecting unit has the optical detection zone of the division that is used to detect described peripheral light beam, wherein, the described step that detects peripheral light beam comprises: the step that detects peripheral light beam from the optical detection zone of dividing, and wherein, the described step of control tracing positional comprises: analyze from the detected beam intensity difference of the optical detection zone of each described division to determine the step of tracking mode.
Description of drawings
Fig. 1 schematically shows the view of the structure of optical information reproduction equipment according to an exemplary embodiment of the present invention.
Fig. 2 shows the stereographic map of the structure of beam splitter shown in Figure 1.
Fig. 3 shows the view of structure of the optical information reproduction equipment of another exemplary embodiment according to the present invention.
Fig. 4 shows the view that the beam detection in the peripheral light beam detecting device of reconstruction beam processor shown in Figure 2 is handled.
Fig. 5 shows in the example depicted in fig. 4 when optical data recording medium has moved preset distance the view of the example of the image that detects from optical detection zone.
Fig. 6 is a curve map, shows following the tracks of the beam intensity that operation just often detects from optical detection zone A and optical detection zone B under the situation of optical data recording medium rotation.
Fig. 7 shows when tracing positional view by the example of the detected image of peripheral light beam detecting device when the normal position moves upward.
Fig. 8 show that optical data recording medium wherein further moves upward from position shown in Figure 7 and track away from the view of entopic situation.
Fig. 9 is a curve map, shows the variation when track beam intensity optical detection zone A and the optical detection zone B when the normal position slowly moves upward.
Figure 10 shows the curve map of the difference variation of beam intensity between optical detection zone A and optical detection zone B.
Figure 11 shows the curve map of the example of the beam intensity that is used to detect the peripheral light spot image with four optical detection zones.
Figure 12 shows the process flow diagram of optical information reproduction method according to an exemplary embodiment of the present invention.
Embodiment
Describe the optical information reproduction equipment of some exemplary embodiment below with reference to accompanying drawings in detail and use its optical information reproduction method according to the present invention.
Fig. 1 schematically shows the view of the structure of optical information reproduction equipment according to an exemplary embodiment of the present invention.
The example of optical information reproduction equipment is described with reference to Fig. 1.As shown in the drawing, optical information reproduction equipment comprises that reference beam provides unit 100, peripheral light beam detecting unit 200, tracking servo unit 300 and reconstruction beam detecting unit 400.
The optical data recording medium 1 that wherein records optical information has disk shape.In optical data recording medium 1, there are a plurality of hot spots that are re-used and write down (spot).Each hot spot is meant the recording areas that wherein records optical information.
Reference beam provides unit 100 to reproducing recording areas and reproducing recording areas peripheral recording areas irradiation reference beam R on every side.By to optical data recording medium 1 irradiation reference beam R, reproduce reconstruction beam Pd from reproducing recording areas, and reproduce peripheral light beam Pn from peripheral recording areas.Reconstruction beam Pd and peripheral light beam Pn can have the P polarization.Reconstruction beam Pd and peripheral light beam Pn with P polarization propagate to peripheral light beam detecting unit 200.
Peripheral light beam detecting unit 200 comprises polarization beam apparatus 240, beam splitter 260, λ/4 wave plates 250 and peripheral light beam detecting device 270.Peripheral light beam detecting unit 200 also comprises first lens 210, second lens 220 and the 3rd lens 230.
Second lens 220 have identical focal length " f " with the 3rd lens 230.With the distance setting between first lens 210 and second lens 220 is " 2f ".
The reconstruction beam Pd and the peripheral light beam Pn that send from optical data recording medium 1 propagate to polarization beam apparatus 240 by first lens 210.Polarization beam apparatus 240 makes the reconstruction beam Pd that propagates from first lens 210 and peripheral light beam Pn to 220 transmissions of second lens.
Polarization beam apparatus 240 has beam-splitting surface 241.Beam-splitting surface 241 makes the light beam transmission with P polarization and makes the beam reflection with S polarization.Therefore, reconstruction beam Pd and the peripheral light beam Pn that propagates from first lens 210 propagates to second lens 220.
Fig. 2 shows the stereographic map of the structure of beam splitter shown in Figure 1 260.
See figures.1.and.2, beam splitter 260 has plate-like body.Centre at beam splitter 260 is formed with the through hole 262 that only makes reconstruction beam Pd transmission.
Reconstruction beam Pd passes beam splitter 260 by through hole 262, propagates to reconstruction beam detecting unit 400 then.Reconstruction beam detecting unit 400 detects the optical information of reconstruction beam Pd.Therefore, can make the information regeneration that is included among the reconstruction beam Pd by using the optical information that detects.
On the other hand, beam splitter 260 with λ/4 wave plates, 250 facing surfaces on be formed with reflectance coating 261 with preliminary dimension.Reflectance coating 261 can by on body surface, apply can folded light beam material form.
Only make reconstruction beam Pd be transmitted through reconstruction beam detecting unit 400 selectively by beam splitter 260, and other peripheral light beam Pn reflex to λ/4 wave plates 250.
On the other hand, the peripheral light beam Pn that is transmitted to λ/4 wave plates 250 is changed the light beam into S.That is, propagate peripheral light beam Pn by λ/4 wave plates 250 and be reflected and propagate by λ/4 wave plates 250 once more, thereby change the polarization direction.
The peripheral light beam Pn that changes into the S light beam is transmitted through polarization beam apparatus 240 by second lens 220.At this moment, because the beam-splitting surface 241 of polarization beam apparatus 240 makes the transmission of P light beam and makes the reflection of S light beam, the peripheral light beam Pn that therefore changes into the S light beam is reflected onto the 3rd lens 230.
The peripheral light beam Pn that is transmitted to the 3rd lens 230 focuses on peripheral light beam detecting device 270 places, and this peripheral light beam detecting device 270 is arranged in apart from the position of the 3rd lens 230 focal lengths " f ' ".At this moment, " f ' " is can be according to environment and the value suitably selected." f ' " can equal " f ".
Peripheral light beam detecting device 270 detects from the optical information of the peripheral light beam Pn of the 3rd lens 230 propagation.At this moment, peripheral light beam detecting device 270 can detect the optical information of peripheral light beam Pn by using the optical detection zone of dividing.Can realize peripheral light beam detecting device 270 by providing as the photodiode of beam detection element.To describe the structure of peripheral light beam detecting device 270 after a while in detail.
Tracking servo unit 300 comprises tracing positional determination portion 310, tracing positional controller 320 and tracing positional adjustment part 330.
The optical information that tracing positional determination portion 310 monitors by peripheral light beam detecting device 270 detected peripheral light beam Pn, and determine current tracking mode.Tracing positional determination portion 310 is determined tracking mode by use from the beam intensity of the detected peripheral light beam Pn of optical detection zone of the division of peripheral light beam detecting device 270.
Tracing positional controller 320 is based on the tracing positional of being determined by tracing positional determination portion 310 and to tracing positional adjustment part 330 output control signals.Tracing positional adjustment part 330 is used for adjusting in response to described control signal the position of peripheral light beam detecting unit 200, promptly adjusts tracing positional.
Under the state of the position of controlling peripheral light beam detecting units 200 by tracking servo unit 300, reconstruction beam detecting unit 400 detects the reconstruction beam Pd that has passed peripheral light beam detecting unit 200.
Another example of optical information reproduction equipment is described with reference to Fig. 3 below.Here, another example of optical information reproduction equipment has the structure of the above-mentioned example that is similar to optical information reproduction equipment.Therefore, represent with identical Reference numeral, and omit detailed description with above-mentioned example components identical.
Fig. 3 shows the view of structure of the optical information reproduction equipment of another exemplary embodiment according to the present invention.
As shown in Figure 3, optical information reproduction equipment comprises that reference beam provides unit 100, peripheral light beam detecting unit 600, tracking servo unit 300 and reconstruction beam detecting unit 400.Peripheral light beam detecting unit 600 comprises beam splitter 630 and peripheral light beam detecting device 670.Peripheral light beam detecting unit 600 also comprises first lens 610 and second lens 620.
When unit 100 is provided by reference beam to optical data recording medium 1 incident reference beam R, send reference beam Pd and peripheral light beam Pn.
Reference beam Pd and peripheral light beam Pn propagate abreast by first lens 610, and focus on the beam splitter 630 when passing second lens 620.The reconstruction beam Pd that includes optical information to be detected passes the through hole 630a that is formed on beam splitter 630 central authorities, and is transmitted to reconstruction beam detecting unit 400.Reconstruction beam detecting unit 400 detects the optical information of reconstruction beam Pd.Can reproduce the data that are included among the reconstruction beam Pd by using the optical information that detects.
Peripheral light beam detecting device 670 be arranged in beam splitter 630 with second lens, 620 facing surfaces on.Can realize peripheral light beam detecting device 670 by providing as the photodiode of beam detection element.
Peripheral light beam detecting device 670 detects at least one the peripheral light beam Pn that propagates from second lens 620.Peripheral light beam detecting device 670 can detect peripheral light beam Pn by using the optical detection zone of dividing.
The servo operation of optical information reproduction equipment will be described below.Here, similar each other with tracking servo operation according to an exemplary embodiment of the present according to the optical information reproduction equipment of described another exemplary embodiment.Therefore, with reference to exemplary embodiment of the present the tracking servo operation is described.
Fig. 4 shows the view of following example, in this example, and the peripheral light beam detecting device 270 detection optical information of reconstruction beam processing unit 200 according to an exemplary embodiment of the present invention.Here, when tracing positional is on the track, detect a peripheral light beam light spot image Pn1 exactly by peripheral light beam detecting device 270.
As shown in Figure 4, peripheral light beam detecting device 270 has a plurality of optical detection zones, and the size of optical detection zone can detect a central light spot image Pn1 of eight light spot images of incident peripheral light beam fully.Optical detection zone can be divided into optical detection zone A and optical detection zone B.That is, peripheral light beam detecting device 270 can adopt two subregion beam splitters.
In the example depicted in fig. 4, because tracking mode is good, therefore detect the light spot image Pn1 of a peripheral light beam fully from optical detection zone.Therefore, detect half of light spot image Pn1 of corresponding peripheral light beam respectively from optical detection zone A and optical detection zone B.That is, when tracing positional was on the track, the beam intensity that detects from optical detection zone A equated with the beam intensity that detects from optical detection zone B.
Fig. 5 shows in the example depicted in fig. 4, the view of the image that has detected from optical detection zone when optical data recording medium has moved preset distance.
Here, described motion is meant the rotation of optical data recording medium 1.Because the actual light spot image Pn1 of peripheral light beam and Pn2 still less than the radius of turn of optical data recording medium 1, therefore can be considered as tangential movement with the light spot image Pn1 and the Pn2 of peripheral light beam when detection optical information.When hypothesis optical data recording medium 1 when rotating in the counterclockwise direction, can think that the light spot image Pn1 of peripheral light beam and Pn2 are to left movement.Therefore, the arrow shown in Fig. 5 upside is represented the direction of motion of optical data recording medium 1.
With reference to Fig. 5, optical data recording medium 1 rotates a little, and two light spot image Pn1 of two peripheral light beams and half of Pn2 are included in the optical detection zone.Therefore because the distance between two light spot images, from the detected beam intensity of optical detection zone less than detected beam intensity Fig. 4.
Yet, equal detected beam intensity from optical detection zone B from the detected beam intensity of optical detection zone A.That is, when tracing positional is on the track, equal detected beam intensity from the detected beam intensity of optical detection zone A, no matter and whether optical data recording medium 1 rotates from optical detection zone B.
Fig. 6 is a curve map, show tracing positional just often along with the rotation of optical data recording medium from detected beam intensity of optical detection zone A and the detected beam intensity of optical detection zone B.In curve map shown in Figure 6, Y-axis is represented beam intensity, and the X-axis express time.
As shown in Figure 6, when tracing positional is on the track, from the detected beam intensity of optical detection zone A with increase repeatedly and reduce from the detected beam intensity of optical detection zone B.That is, as shown in Figure 4, when the light spot image Pn1 of peripheral light beam is included in the optical detection zone fully, the beam intensity maximum, and as shown in Figure 5, when half of the light spot image Pn1 of two peripheral light beams and Pn2 is included in the optical detection zone, the beam intensity minimum.
Yet, from the curve map of Fig. 6 as can be seen, when tracing positional is on the track, always equal detected beam intensity from the detected beam intensity of optical detection zone A from optical detection zone B, no matter and whether optical data recording medium 1 rotates.
Fig. 7 shows when tracing positional view by the example of the detected image of peripheral light beam detecting device when the normal position moves upward.
With reference to Fig. 7, as can be seen, tracing positional moves upward from the normal position, and from the detected beam intensity of optical detection zone A greater than from the detected beam intensity of optical detection zone B.This is because detect the middle body of light spot image Pn1 from optical detection zone A, and detects the part of light spot image Pn1 and than the part of the reproduced image Pd3 on the lower railway from optical detection zone B.
Therefore, when from the detected beam intensity of optical detection zone A greater than from the detected beam intensity of optical detection zone B the time, control following servo controller 500 makes 200 motions of peripheral light beam detecting unit so that tracing positional moves downward.
With identical design, when from the detected beam intensity of optical detection zone B greater than from the detected beam intensity of optical detection zone A the time, tracing positional moves downward from the normal position.In this case, peripheral light beam detecting unit 200 is adjusted into tracing positional is moved upward.
Fig. 8 show that tracing positional wherein further moves upward from position shown in Figure 7 and tracing positional from the normal position farthest the view of example.
With reference to Fig. 8, as can be seen, tracing positional to be detected further moves upward from position shown in Figure 7, and equals the detected beam intensity from optical detection zone B from the detected beam intensity of optical detection zone A.
In this case, owing to equal detected beam intensity from optical detection zone B from the detected beam intensity of optical detection zone A, therefore similar to situation shown in Figure 4.But, even when equaling from the detected beam intensity of optical detection zone A from the detected beam intensity of optical detection zone B, also can by before monitoring and tracing positional afterwards distinguish the normal situation of tracing positional with from tracing positional situation farthest.
Fig. 9 is a curve map, shows the variation of the beam intensity of optical detection zone A and optical detection zone B when tracing positional slowly moves upward from the normal position.In curve map shown in Figure 9, Y-axis is represented beam intensity, and the X-axis express time.
With reference to Fig. 9, " a " locates at point, and the beam intensity of optical detection zone A equals the beam intensity of optical detection zone B, this means that tracing positional is normal.But at point " a " afterwards, the beam intensity of optical detection zone A is greater than the beam intensity of optical detection zone B.That is, this means that tracing positional moves upward.
On the other hand, under the situation that tracing positional moves upward, " b " locates at point, and the beam intensity of optical detection zone A equals the beam intensity of optical detection zone B once more.Figure 8 illustrates this situation.That is, this means that tracing positional upwards leaves situation farthest.
Can be by before monitoring and beam intensity afterwards and point " a " and point " b " are distinguished from each other out.That is, at point " b " before, the beam intensity of optical detection zone A is greater than the beam intensity of optical detection zone B, and at point " b " afterwards, the beam intensity of optical detection zone A is less than the beam intensity of optical detection zone B.Therefore, at such some place, that is: beam intensity is equal to each other at this some place, and this can determine that tracing positional moves upward as shown in Figure 8 between the beam intensity of the optical detection zone A point of beam intensity less than the beam intensity of optical detection zone B greater than the point of the beam intensity of optical detection zone B and optical detection zone A.As a result, can adjust tracing positional downwards by tracking servo unit 500.
Figure 10 shows the curve map that changes in the difference between the beam intensity between the beam intensity of optical detection zone A and the optical detection zone B, shows under the situation that beam intensity shown in Figure 9 changes the difference between optical detection zone A and the optical detection zone B.
With reference to Figure 10, " a " locates at point, because the beam intensity of optical detection zone A equals the beam intensity of optical detection zone B, so the difference of beam intensity is " 0 ".That is, this means the normal situation of tracing positional.
Afterwards, under the situation that tracing positional moves upward, the difference increase of the beam intensity between optical detection zone A and the optical detection zone B then reduces, and locates vanishing at point " b ".But, because point " b " is such point, that is: as mentioned above, being in beam intensity at this point is equal to each other, and before this point and afterwards the difference of beam intensity reduces, therefore before considering and state afterwards, this point means such state: tracing positional moves upward as shown in Figure 8.Therefore, should adjust tracing positional downwards.
By this way, can determine current tracking mode, and therefore adjust tracking mode by control tracking servo unit 300 by the beam intensity that monitors optical detection zone A and optical detection zone B.Can carry out described definite and control operation by tracing positional determination portion 310, tracing positional controller 320 and tracing positional adjustment part 330.
On the other hand, demonstrated peripheral light beam detecting device 270 and comprise one two subregion beam splitter in Fig. 4 to Fig. 8, this beam splitter has optical detection zone A and optical detection zone B.But according to circumstances, peripheral light beam detecting device 270 can comprise a plurality of two subregion beam detectors or have the beam detector of three or more optical detection zones.
Figure 11 shows the curve map of example of the beam intensity of the light spot image that utilizes four optical detection zones to detect peripheral light beams.
With reference to Figure 11, this beam detector has four optical detection zones: optical detection zone A, optical detection zone B, optical detection zone C and optical detection zone D.That is, peripheral light beam detecting device 270 comprises two two subregion beam detectors.
In this case, also can determine tracing positional based on the beam intensity difference between the beam intensity difference between optical detection zone A and the optical detection zone B and optical detection zone C and the optical detection zone D.For example, can be by the beam intensity difference between the beam intensity difference between optical detection zone A and the optical detection zone B and optical detection zone C and the optical detection zone D be asked on average, and determine tracking mode.
By adopting this optical detection structure, can determine the initial or end of the track of optical data recording medium 1.
Promptly, when almost not having difference between the beam intensity summation of the beam intensity summation of optical detection zone A and optical detection zone B and optical detection zone C and optical detection zone D, can determine that current track is the original orbit of optical data recording medium 1 and the intermediate orbit outside the track of end.This is because intermediate orbit shows constant relatively beam intensity.
On the other hand, differing greatly and when having continued constant time, can determine that current track is the original orbit or the end track of optical data recording medium 1 between the beam intensity summation of the beam intensity summation of optical detection zone A and optical detection zone B and optical detection zone C and optical detection zone D.This be because near before the original orbit or the detection of the track after the track of end less than optical information.
Therefore, by adopting a plurality of two subregion beam detectors, can detect original orbit and end track and accurately determine tracking mode.
Figure 12 shows the process flow diagram of optical information reproduction method according to an exemplary embodiment of the present invention.Can carry out the optical information reproduction method shown in Figure 12 by above-mentioned optical information reproduction equipment.
With reference to Figure 12, at first, the optical information that should obtain peripheral light beam Pn is to obtain current trace information.Therefore, reference beam provides reproduction recording areas and the peripheral recording areas input reference beam R (step S10) of unit 100 to optical data recording medium 1.
At this moment, in response to reference beam R, reproduce reconstruction beam Pd from reproducing recording areas, and reproduce peripheral light beam Pn from peripheral recording areas.
The optical detection zone of division that at this moment, can be by using peripheral light beam detecting unit 200 detects the optical information of peripheral light beam Pn.For example, as mentioned above, detect the optical information of a peripheral light beam Pn from two optical detection zones.Can detect the optical information of two peripheral light beam Pn respectively from two optical detection zones.In this case, can discern original orbit and end track.Here, the light beam (step S20) that two peripheral light beam Pn are meant before current track and the hot spot the track afterwards reproduces.
Optical information to detected peripheral light beam Pn is analyzed, and determines current tracking mode, and need to judge whether tracking servo control.Here, need tracking servo when control, adjust tracing positional, and, keep current tracking mode when judging when not needing tracking servo to control based on current tracing positional when judging.
For example, when the beam intensity between two optical detection zones does not have difference, keep current tracking mode, and when the beam intensity between the two is variant, carry out tracking servo control based on current tracing positional.That is, follow the tracks of adjustment.
For example, when tracing positional when the normal position moves upward, tracing positional is shifted under tracking servo control, and when tracing positional when the normal position moves downward, tracing positional is shifted downwards under tracking servo is controlled.
By this way, by adjusting tracing positional, detecting the optical information of the reconstruction beam that under normal tracking mode, reproduces and recovery and be included in data in the reconstruction beam, can obtain the optical information (step S40) of required recording areas.
According to the invention described above, can determine current tracking mode by when reproduction optical information, using peripheral light beam, and determine that by using the result carries out tracking servo control.Therefore, can carry out tracking servo control effectively, thereby and control by tracking servo and to reduce bit error rate (BER) and increased the reliability of reproducing data by simple structure.
Claims (13)
1, a kind of optical information reproduction equipment, this optical information reproduction equipment comprises:
Reference beam provides the unit, and this reference beam provides the to be reproduced reproduction recording areas of unit on optical data recording medium and the peripheral recording areas input reference beam around this reproduction recording areas;
Peripheral light beam detecting unit, this peripheral light beam detecting unit make the reconstruction beam transmission of reproducing from described reproduction recording areas in response to described reference beam, and detect the peripheral light beam that reproduces from described peripheral recording areas;
The tracking servo unit, tracing positional is analyzed and controlled in this tracking servo unit to the optical information of detected peripheral light beam; And
The reconstruction beam detecting unit, this reconstruction beam detecting unit detects the reconstruction beam that passes described peripheral light beam detecting unit,
Wherein, described peripheral light beam detecting unit has the optical detection zone that is used to detect described peripheral light beam, and described optical detection zone further is divided into the optical detection zone of division, and
Wherein, described tracking servo unit is by determining tracing positional to comparing mutually from the detected beam intensity of the optical detection zone of each described division.
2, optical information reproduction equipment according to claim 1, wherein, described peripheral light beam detecting unit comprises:
Beam splitter, this beam splitter are separated described peripheral light beam and described reconstruction beam; With
The peripheral light beam detecting device, this peripheral light beam detecting device detects by the isolated described peripheral light beam of described beam splitter.
3, optical information reproduction equipment according to claim 2, wherein, described peripheral light beam detecting unit also comprises:
Polarization beam apparatus, this polarization beam apparatus are arranged between described optical data recording medium and the described beam splitter; With
λ/4 wave plates, this λ/4 wave plates are arranged between described polarization beam apparatus and the described beam splitter.
4, optical information reproduction equipment according to claim 3 wherein, is formed with the through hole that described peripheral light beam is reflexed to the reflectance coating of described polarization beam apparatus and make described reconstruction beam transmission in described beam splitter, and
Wherein, described peripheral light beam detector arrangement is in the light path by described polarization beam apparatus beam reflected.
5, optical information reproduction equipment according to claim 2 wherein, is formed with the through hole that makes described reconstruction beam transmission in described beam splitter, and
Wherein, described peripheral light beam detector arrangement is at the described peripheral light beam light incident side of described beam splitter.
6, optical information reproduction equipment according to claim 1, wherein, described tracking servo unit comprises:
The tracing positional determination portion, this tracing positional determination portion is analyzed to determine tracking mode the optical information of detected peripheral light beam;
The tracing positional controller, this tracing positional controller is determined the result and is exported the control signal that is used to adjust tracing positional based on the tracking mode of described tracing positional determination portion; With
The tracing positional adjustment part, tracing positional is adjusted in response to the control signal of exporting from described tracing positional controller in this tracing positional adjustment part.
7, optical information reproduction equipment according to claim 1, wherein, described peripheral light beam detecting unit comprises a plurality of optical detection zones that are used to detect a plurality of peripheral light beams, and
Wherein, described tracking servo unit is to comparing mutually from the detected beam intensity of each described optical detection zone, with one in the original orbit that detects described optical data recording medium and the end track.
8, optical information reproduction equipment according to claim 7, wherein, the beam intensity of each optical detection zone is the summation from the detected beam intensity of optical detection zone of described division.
9, a kind of optical information reproduction method, this optical information reproduction method comprises the steps:
Reproduction recording areas to be reproduced on optical data recording medium and the peripheral recording areas input reference beam around this reproduces recording areas;
Make the reconstruction beam transmission of reproducing from described reproduction recording areas pass through the peripheral light beam detecting unit, and detect the peripheral light beam that reproduces from described peripheral recording areas in response to described reference beam;
Tracing positional is analyzed and controlled to the optical information of detected peripheral light beam; And
The reconstruction beam that detection is reproduced from described reproduction recording areas,
Wherein, described peripheral light beam detecting unit has the optical detection zone that is used to detect described peripheral light beam, and described optical detection zone further is divided into the optical detection zone of division,
Wherein, the described step that detects peripheral light beam comprises: detect the step of peripheral light beam from the optical detection zone of dividing, and
Wherein, the described step of control tracing positional comprises: analyze from the detected beam intensity difference of the optical detection zone of each described division to determine the step of tracking mode.
10, according to the described optical information reproduction method of claim 9, wherein, when when the detected beam intensity of the optical detection zone of each described division does not almost have difference, it is normal to judge tracking mode, and when beam intensity differed greatly, it was undesired to judge tracking mode.
11,, wherein,, adjust described tracing positional to reduce beam intensity difference when when the detected beam intensity of the optical detection zone of each described division differs greatly according to the described optical information reproduction method of claim 9.
12, according to the described optical information reproduction method of claim 9, wherein, the described step that detects peripheral light beam comprises the steps: to detect a plurality of peripheral light beams from a plurality of optical detection zones, and the beam intensity of detected a plurality of peripheral light beams is compared mutually with the original orbit that detects described optical data recording medium and at least one in the track of end.
13, according to the described optical information reproduction method of claim 12, wherein, the beam intensity of each optical detection zone is the summation from the detected beam intensity of optical detection zone of described division, and
Wherein, when the beam intensity between described a plurality of optical detection zones differs greatly, on tracing positional in the original orbit of described optical data recording medium and end track.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020060031303A KR100767932B1 (en) | 2006-04-06 | 2006-04-06 | Apparatus for Reproducing Optical Information, Control Apparatus for Tracking Servo and Control Method for Tracking |
| KR1020060031303 | 2006-04-06 | ||
| KR1020060092892 | 2006-09-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101051212A CN101051212A (en) | 2007-10-10 |
| CN100582965C true CN100582965C (en) | 2010-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710089190A Expired - Fee Related CN100582965C (en) | 2006-04-06 | 2007-03-21 | Optical information reproducing apparatus and optical information reproducing method using the same |
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| Country | Link |
|---|---|
| KR (1) | KR100767932B1 (en) |
| CN (1) | CN100582965C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5686717B2 (en) * | 2011-11-28 | 2015-03-18 | 株式会社日立メディアエレクトロニクス | Optical information reproduction device |
| CN105108330A (en) | 2015-08-20 | 2015-12-02 | 京东方科技集团股份有限公司 | Beam splitter, laser generator and excimer laser annealing device |
| EP3522161A4 (en) * | 2016-09-30 | 2019-10-16 | Sony Semiconductor Solutions Corporation | Playback device and playback method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4162899B2 (en) | 2002-02-04 | 2008-10-08 | 新オプトウエア株式会社 | Optical information recording apparatus and method, optical information reproducing apparatus and method, and optical information recording and reproducing apparatus and method |
| JP4097533B2 (en) | 2003-01-22 | 2008-06-11 | Ｔｄｋ株式会社 | Hologram recording method and apparatus |
| JP4574183B2 (en) | 2004-02-13 | 2010-11-04 | パイオニア株式会社 | Hologram recording medium |
| JP2006030380A (en) | 2004-07-13 | 2006-02-02 | Sony Corp | Hologram device and hologram recording method |
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| KR20070099918A (en) | 2007-10-10 |
| KR100767932B1 (en) | 2007-10-18 |
| CN101051212A (en) | 2007-10-10 |
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