CN212322302U - Accurate detection and control device for optical head position of optical disc and optical disc - Google Patents
Accurate detection and control device for optical head position of optical disc and optical disc Download PDFInfo
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- CN212322302U CN212322302U CN202020138965.8U CN202020138965U CN212322302U CN 212322302 U CN212322302 U CN 212322302U CN 202020138965 U CN202020138965 U CN 202020138965U CN 212322302 U CN212322302 U CN 212322302U
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Abstract
The utility model relates to an accurate detection and controlling means of CD optical head position belongs to the holographic storage technology field of light. The utility model discloses utilize the sphere reference beam to shift the narrow selectivity of shifting that multiplexing technique has, be equipped with one including x direction position control unit and y direction position control unit in storage medium with the control area of data area phase separation. The hologram of the special pattern is recorded in the control area as in the data area, the information in the control area is read out first when reading the data, and the position of the optical head relative to the hologram in the data area is detected in the x-direction and the y-direction, respectively, based on the information read by the hologram in the control area, thereby controlling the reference light to the correct position indicated by the address.
Description
Technical Field
The utility model relates to a holographic storage technical field of light, concretely relates to accurate detection and controlling means of CD optical head position among reference beam aversion multiplexing holographic storage system.
Background
The spherical reference beam shift multiplexing technology has narrower shift selectivity, can reduce the shift distance between adjacent holograms and improve the recording data density. Fig. 1 shows the general shift selectivity of the spherical reference beam shift multiplexing method, with the horizontal axis representing the offset distance of the reference light readout position with respect to the recorded hologram, the vertical axis representing the normalized intensity of the readout signal in the hologram reconstruction light, x representing the along-track direction, and y representing the direction perpendicular to the track. Here, the narrow shift selectivity also means that if sufficiently strong signal light needs to be read, the positional tolerance of the reference beam is required to be very small. Therefore, in order to stably read out data, it is necessary to accurately control the position of the reference light with respect to the recorded hologram.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to overcome at least one of the above-mentioned drawbacks of the prior art, and provides an accurate detection and control method for an optical disc head for accurately controlling the position of a reference light with respect to a recording hologram when reading optical disc data.
The utility model discloses utilize the sphere reference beam to shift the aversion selectivity that multiplexing technique has, be equipped with one including x direction position control unit and y direction position control unit in storage medium with the control area of data area phase separation. As with the data area, a hologram of a special pattern is recorded therein, information in the control area is read out first when reading data, and positional errors of the reference light with respect to the hologram in the data area can be detected in the x-direction and the y-direction, respectively, based on the pattern read by the hologram in the control area, thereby controlling the reference light to the correct position indicated by the address.
The utility model provides an accurate detection and control method of CD optical head position, including following each step:
(1) a beam of spherical wave reference light and a beam of object light carrying signals form a holographic field at the recording position in the storage medium and are used for recording signal information;
(2) dividing a sector on a storage medium into a control area and a data area, wherein the control area comprises an x-direction position control unit and a y-direction position control unit;
(3) shifting the holograms at equal distance in the direction vertical to the optical path, obtaining the deviation signal of the position by the difference of the diffraction light intensity of the holograms, and controlling the position of the optical head of the optical disk according to the deviation signal of the position of the y direction position control area to be 0;
(5) staggering the holograms at constant intervals along the optical path direction, and obtaining deviation signals of positions through the diffraction light intensity difference of the holograms; and accordingly, the position of the optical head of the optical disk is controlled so that the position deviation signal of the x-direction position control area becomes 0.
Particularly, the utility model relates to an accurate detection and control method of CD reading position for read and use the CD to be the data of storage in the storage medium, the data unit of storage is including the position control unit in the storage medium, the method is when reading the target data unit, earlier through whether the position deviation signal detection that the position control unit of target data unit formed reads the position accurate, and according to on the position deviation signal control reads position to accurate position, read again data in the data unit. The reading position of the optical disc is the irradiation position of the reference light on the optical disc, also called the pickup position.
The position control unit is a plurality of patterns which are stored in the storage medium and are arranged in a staggered mode, the light intensity difference of two or two groups of corresponding patterns is 0 or a preset value at the accurate position, and the position deviation signal is the light intensity difference of two or two groups of corresponding patterns at the reading position.
The data units are sectors, each sector comprising at least an address area for storing an address unit, a control area for storing a location control unit and a data area for storing a data unit.
The optical disc is a holographic storage medium, at least part of data is stored in a shift multiplexing holographic storage mode, the method is used for reading the part of data, the position control unit comprises an x-direction position control unit and a y-direction position control unit, the x direction is defined as the shift direction of the shift multiplexing holographic storage, and the y direction is perpendicular to the x direction.
The position control unit is two or two groups of holographic patterns which are stored in the storage medium and are arranged in a staggered mode, the diffraction light intensity difference of the two or two groups of corresponding patterns is 0 or a preset value at the accurate position, and the position deviation signal is the diffraction light intensity difference of the two or two groups of corresponding patterns at the reading position.
In the method, when the reading position is at a position adjacent to the track, a position deviation signal is obtained by comparing the difference of the diffracted light intensities of the two or two sets of holographic patterns, and the reading position is controlled accordingly so that the position deviation signal in the y direction becomes 0 or a predetermined value.
The y-direction position control unit is: and distributing the plurality of holographic patterns on two sides of the light path at equal intervals with the light path in two groups, wherein each group comprises a plurality of holographic patterns which are arranged at equal intervals.
The two groups of holographic patterns are staggered in the direction parallel to the optical path, and the staggered distance is the moving distance d when the data area is shifted and multiplexed.
The holographic patterns are circular, the two groups of holographic patterns are mutually staggered, and the light path is positioned in the symmetrical center of the staggered area along the x direction.
The controlling of the reading position means controlling the reading position to move up and down in a direction perpendicular to the track until the position deviation signal becomes 0 or a predetermined value.
The accurate positions in the x direction are points e and f with the distance equal to the shift multiplexing distance d, the distance between the two points and the initial point in the data area is integral multiple of d, one or two groups of holograms are respectively recorded at the positions with the distance delta x between the points e and f, the difference of the diffraction light intensity of the two or two groups of patterns corresponding to the positions of the points e and f is 0 or a preset value.
The x-direction position control unit is: and arranging the plurality of holographic patterns alternately at equal intervals along the light path in two groups, wherein each group comprises a plurality of holographic patterns arranged at equal intervals.
The holographic patterns are circular, and the distance between the circle centers of the two circular holographic patterns corresponding to the points e and f is smaller than d.
In the method, the detection and control in the y direction are performed first, and then the detection and control in the x direction are performed.
An optical disc or a storage medium suitable for use in the above method, wherein the data unit stored in the storage medium comprises a position control unit.
The position control unit is a plurality of patterns which are stored in the storage medium and are arranged in a staggered mode, and the light intensity difference of two or two groups of corresponding patterns is 0 or a preset value at the accurate position of the alignment reading data unit.
The data units are sectors, each sector comprising at least an address area for storing an address unit, a control area for storing a location control unit and a data area for storing a data unit.
The optical disc is a holographic storage medium, at least part of data is stored in a shift multiplexing holographic storage mode, the position control unit comprises an x-direction position control unit and a y-direction position control unit, the x direction is defined as the shift direction of the shift multiplexing holographic storage, and the y direction is perpendicular to the x direction.
The position control unit is two or two groups of holographic patterns which are stored in the storage medium and are arranged in a staggered mode, and the difference of the diffraction light intensities of the two or two groups of corresponding patterns is 0 or a preset numerical value at the accurate position.
The exact position in the y-direction is on the track read by the data unit where the difference in the diffracted light intensity of the corresponding two or two sets of patterns is 0 or a predetermined value.
The y-direction position control unit is: and distributing the plurality of holographic patterns on two sides of the light path at equal intervals with the light path in two groups, wherein each group comprises a plurality of holographic patterns which are arranged at equal intervals.
The two groups of holographic patterns are staggered in the direction parallel to the optical path, and the staggered distance is the moving distance d when the data area is shifted and multiplexed.
The holographic patterns are circular, the two groups of holographic patterns are mutually staggered, and the light path is positioned in the symmetrical center of the staggered area along the x direction.
The accurate position in the x direction is two points e and f which are separated by a distance d moved during the shift multiplexing, the distances from the two points to the starting point in the data area are both integer multiples of d, and the difference of the diffraction light intensities of two or two groups of patterns corresponding to the positions of the points e and f is 0 or a preset value.
The x-direction position control unit is: and arranging the plurality of holographic patterns alternately at equal intervals along the light path in two groups, wherein each group comprises a plurality of holographic patterns arranged at equal intervals.
The holographic patterns are circular, and the distance between the circle centers of the two circular holographic patterns corresponding to the points e and f is not equal to d.
The distance between the centers of the two circular holographic patterns corresponding to the points e and f is less than d.
An apparatus for accurately detecting and controlling the reading position of an optical disc suitable for the above method and the optical disc, comprising:
an optical system for reading the data of an optical disc,
a translation stage for supporting the optical disc to perform translation,
the optical disc drive device also comprises a comparator which is used for comparing the difference value of two or two groups of position deviation signals read from the optical disc by the optical system and driving the translation stage to support the optical disc to translate according to the difference value until the difference value meets the requirement.
The optical system is a reference optical system of the holographic storage reading system, and the position deviation signals compared by the comparator are the diffraction light intensities of different patterns on the same position and/or the diffraction light intensities of two patterns with the distance of the two patterns which is the moving distance of the holographic storage displacement multiplexing.
The translation stage comprises an x-direction translation mechanism and a y-direction translation mechanism, the x-direction translation mechanism is used for controlling the translation stage to support the optical disc to translate along the direction of the optical disc displacement multiplexing movement, and the y-direction translation mechanism is used for controlling the translation stage to support the optical disc to translate along the direction perpendicular to the x direction.
The x-direction translation mechanism further comprises a stepping translation mechanism, and the stepping translation mechanism controls the translation table to support the optical disk to translate along the x direction by taking the distance moved when the holographic storage displacement is multiplexed as a stepping distance.
The translation stage further comprises a preliminary positioning mechanism for controlling the translation stage to support the optical disc to move and controlling a control area of any sector of the optical disc to be aligned with the position of the optical head of the optical system.
The preliminary positioning mechanism comprises a translational and/or rotational and/or tumbling positioning mechanism.
Compared with the prior art, the beneficial effects of the utility model are that: the problem of accurately controlling the position of the reference light relative to the recorded hologram when reading the data of the optical disk is solved, the irradiation position of the optical head can be accurately aligned with the light path of the hologram, real-time dynamic adjustment can be realized in the reading process, and errors caused by a machine are reduced.
Drawings
FIG. 1 is a graph of shift selectivity for reading a hologram.
Fig. 2 is a schematic diagram of a data allocation manner of 1 sector on the recording medium.
FIG. 3 is a schematic diagram of head position deviation detection in the y-direction.
FIG. 4 is a block diagram of a y-direction head position control apparatus.
FIG. 5 is a schematic diagram of head position deviation detection in the x-direction.
FIG. 6 is a block diagram of an x-direction head position control apparatus.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The drawings of the present invention are for illustration purposes only and are not to be construed as limiting the invention. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Product examples
For controlling the optical head, the storage medium is provided with a control area separate from the data area as shown in fig. 2, and fig. 2 shows an example of data allocation of a sector on the storage medium, wherein the control area is divided into an x-direction position control unit and a y-direction position control unit. As with the data area, a hologram of a special pattern is recorded therein. They may be recorded simultaneously with the data or may be formatted prior to recording of the data. When reading data, the information in the control area is read out, and the position error of the reference light relative to the hologram in the data area can be detected in the x direction and the y direction respectively according to the pattern read by the hologram in the control area, so that the reference light is controlled to the correct position shown by the address.
The optical disc or storage medium as described above, each sector comprises an address area for storing address units, a control area for storing location control units and a data area for storing data units. The position control unit comprises an x-direction position control unit and a y-direction position control unit, the x direction is defined as the shift direction of the shift multiplexing holographic storage, and the y direction is perpendicular to the x direction.
The exact position in the y-direction is on the track that the data unit reads, as shown in fig. 3, the hologram is circular, the two sets of hologram are interleaved, and the track is along the x-direction and on the symmetric center of the interleaved area. As shown in the figure, the plurality of hologram patterns are distributed on the upper and lower sides of the track at equal intervals with the track in two groups, and the distance of left and right shift is the distance d moved when the data area is shifted and multiplexed, which is shown as "x-direction distance". When the reference light is located on the track and moves along the track, the difference between the diffracted light intensities of the two sets of patterns is 0.
The exact position in the x direction is two points e and f which are separated by a distance d which is moved during the shift multiplexing, for example, the position corresponding to the solid line outside the center positions of the holograms 4 and 5 in fig. 5, one point in the position, for example, the position on the left side of the center of the hologram 4, the distance from the start point in the data area at the position is an integral multiple d, the two points e and f on the left and right sides of the center positions of the holograms 4 and 5, and the difference of the diffracted light intensities of the reference light at the two positions is 0.
Method embodiment
First, the principle of detecting the positional deviation of the control unit in the y direction is shown in fig. 3. The perpendicular distance between the hologram center and the track 1 is Δ y, and the distance in the x direction of each hologram is Δ x. From the viewpoint of space saving, an appropriate range of Δ y is determined according to the shift selectivity in the y direction, and Δ x is set to the same value as the distance moved in shift multiplexing in the data area. Signals within the control area are read out in the same manner as the data is read out, and readout signals of the hologram 2 shifted up and the hologram 3 shifted down are denoted by a and B, respectively. When the reference beam is moved on line 1 close to the hologram 2, a > B can be obtained; when the reference beam is moved on line 2 close to the hologram 3, a < B can be obtained; when the reference light moves on a line 0 equidistant from the holograms 2 and 3, a — B is obtained. Therefore, it is possible to obtain a positional deviation signal in the y direction by calculating a-B, and control the reference beam position in the y direction so that the positional deviation is 0.
Next, the principle of position deviation detection of the control unit in the x direction is shown in fig. 5, and the reference light position, i.e. the head position, is indicated by an upward arrow. During recording/reading, the storage medium is repeatedly translated and stopped in the x direction, and recording/reading of the hologram is performed at the stopped position, so that the difference between the position of the reference light and the position of the recorded hologram stopped in the x direction will cause signal error. In the x-direction position control unit, the set interval of the holograms on the guide rail is the same as the interval of the holograms in the data unit, Δ x represents the deviation of the position of the actually recorded hologram in the control unit from the preset position, and the proper size of Δ x is determined by the displacement selectivity in the x-axis direction. The signals are read out in the same way as for the holograms in the readout data area, and the readout signals for the right shifted hologram 4 and the left shifted hologram 5 are denoted by C and D. When the reference beam is at position 1, C > D can be obtained respectively; when the reference beam is at position 2, C < D is obtained; when the reference beam position is at position 0, C — D is obtained. Therefore, it is possible to obtain a positional deviation signal in the x direction by calculating C-D, and control the reference beam position in the x direction so that the positional deviation is 0.
In the method, the detection and control in the y direction are performed first, and then the detection and control in the x direction are performed.
Device embodiment
Fig. 4 shows the position control device system in the y-direction of the reference beam. The signals A and B of the x-direction position control unit in the storage medium are detected and read by reference light in the optical system, and the values of A-B are calculated by using the read signals to obtain a position deviation signal of the reference light. The comparator is used to evaluate the difference between the position deviation signal and its target value 0 and then to direct the y-direction translation stage, to which the storage medium is fixed, to translate so that the position error signal becomes 0. This is feedback control done in the y-direction position control unit, and then the position of the y-direction translation stage obtained by the y-direction position control unit is used to read the hologram in the data area.
Fig. 6 shows the position control device system in the x-direction of the reference beam. The C and D signals of the x-direction position control unit in the storage medium are detected and read by reference light in the optical system, and the values of C-D are calculated by using the read signals to obtain a position deviation signal of the reference light. The comparator is used to evaluate the difference between the position deviation signal and its target value 0 and then direct the x-direction translation stage holding the storage medium to translate so that the position error signal becomes 0. This is feedback control done in the x-direction position control unit, and then the position of the x-direction translation stage obtained by the x-direction position control unit is used to read the hologram in the data area.
Based on the above working principle, the present patent is directed to a device for accurately detecting and controlling the reading position of an optical pickup head of an optical disc, comprising: an optical system for reading data from an optical disc, a translation stage for supporting the optical disc to perform translation, and a comparator as shown in fig. 4 and 6, for comparing a difference between two sets of position deviation signals read from the optical disc by the optical system, and driving the translation stage to support the optical disc to translate according to the difference until the difference meets requirements.
The optical system is a reference optical system of the holographic storage reading system, in the y direction, the position deviation signals compared by the comparator are the diffraction light intensities of the upper and lower groups of patterns 2 and 3 on the optical axis, and in the x direction, the position deviation signals compared by the comparator are the diffraction light intensities of the two groups of patterns 4 and 5 corresponding to two positions e and f which are separated along the optical axis by the distance moved during holographic storage displacement multiplexing.
In order to achieve the preliminary positioning of the optical head at the position for reading the corresponding sector, the translation stage further comprises a preliminary positioning mechanism for controlling the translation stage to support the optical disc for movement, and controlling a control area of any sector of the optical disc to be aligned with the position of the optical head of the optical system.
Aiming at the optical discs stored by different storage methods, the primary positioning mechanism comprises a translation and/or rotation and/or turnover positioning mechanism, is suitable for circular optical discs or rectangular storage cards, comprises a single-side storage mode or a double-side storage mode, and is also suitable for storage media of multiple multiplexing storage modes such as shift multiplexing, angle-shift multiplexing, superposition multiplexing, cross multiplexing and the like.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not limitations to the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (10)
1. An apparatus for accurately detecting and controlling the position of an optical pickup head of an optical disc, comprising:
an optical system for reading the data of an optical disc,
a translation stage for supporting the optical disc to perform translation,
the optical disc drive device is characterized by further comprising a comparator, wherein the comparator is used for comparing the difference value of two or two groups of position deviation signals read from the optical disc by the optical system and driving the translation stage to support the optical disc to translate according to the difference value.
2. The apparatus of claim 1, wherein the optical system is a reference optical system of a holographic storage reading system, and the position deviation signal compared by the comparator is the diffracted light intensities of different patterns at the same position and/or the diffracted light intensities of two patterns at a distance of the holographic storage shift multiplexing.
3. The apparatus of claim 1, wherein the translation stage comprises an x-direction translation mechanism for controlling the translation stage to support the optical disc for translation in a direction of the optical disc displacement multiplexing movement, and a y-direction translation mechanism for controlling the translation stage to support the optical disc for translation in a direction perpendicular to the x-direction.
4. The apparatus of claim 3, wherein the x-direction translation mechanism further comprises a step translation mechanism that controls the translation stage to support the optical disc to translate in the x-direction by a step distance that is a distance moved when the holographic storage shift multiplexing is performed.
5. The apparatus according to any of claims 1-4, wherein the translation stage further comprises a preliminary positioning mechanism for controlling the translation stage to support the optical disc for movement, and controlling a control area of any sector of the optical disc to be aligned with the position of the optical head of the optical system.
6. Device according to claim 5, characterized in that the preliminary positioning means comprise translational and/or rotational and/or tilting positioning means.
7. An optical disc comprises a storage medium, wherein data units stored in the storage medium comprise a position control unit, the position control unit is a plurality of patterns which are stored in the storage medium and are arranged in a staggered mode, the light intensity difference of two or two groups of corresponding patterns is 0 or a preset value at the accurate position of aligning and reading the data units, the data units are sectors, and each sector is at least used for storing a control area of the position control unit and a data area used for storing the data units.
8. The optical disc of claim 7, wherein the optical disc is a holographic storage medium, at least a portion of the data is stored by shift-multiplexed holographic storage, and the position control unit comprises an x-direction position control unit and a y-direction position control unit, and the x-direction is defined as a shift direction of the shift-multiplexed holographic storage, and the y-direction is perpendicular to the x-direction.
9. The optical disc of claim 8, wherein the position control unit is two or two groups of holographic patterns stored in the storage medium and arranged in a staggered manner, at the exact position, the difference between the diffracted light intensities of the two or two groups of corresponding patterns is 0 or a predetermined value, the exact position in the y direction is located on a track read by the data unit, at the track, the difference between the diffracted light intensities of the two or two groups of corresponding patterns is 0 or a predetermined value, and the position control unit in the y direction is: and distributing the plurality of holographic patterns on two sides of the light path at equal intervals with the light path in two groups, wherein each group comprises a plurality of holographic patterns which are arranged at equal intervals.
10. The optical disc of claim 8, wherein the position control unit is two or two sets of hologram patterns stored in the storage medium and arranged in a staggered manner, and at the exact position, the difference in diffracted light intensity of the two or two sets of corresponding patterns is 0 or a predetermined value, and the exact position in the x direction is a position on the optical axis read by the data unit of one point e of two points e and f separated by a distance d moved during the shift multiplexing, and the difference in diffracted light intensity of the two or two sets of corresponding patterns at the positions of points e and f is 0 or a predetermined value.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111105457A (en) * | 2020-01-21 | 2020-05-05 | 广东紫晶信息存储技术股份有限公司 | Method for accurately detecting and controlling position of optical head of optical disk, optical disk and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111105457A (en) * | 2020-01-21 | 2020-05-05 | 广东紫晶信息存储技术股份有限公司 | Method for accurately detecting and controlling position of optical head of optical disk, optical disk and device |
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Effective date of registration: 20230802 Address after: Room 401, 4/F, Building 10, No. 233, Jinou Road, Jianghai District, Jiangmen, Guangdong Province, 529000 (information declaration system, multiple photos at one address) Patentee after: Jiangmen Jingjia Information Technology Co.,Ltd. Address before: 514700 in Guangzhou (Meizhou) industrial transfer park, Yujiang Town, Meixian County, Meizhou City, Guangdong Province Patentee before: GUANGDONG AMETHYST INFORMATION STORAGE TECHNOLOGY CO.,LTD. |