CN214671804U - Transmission type holographic storage medium and device - Google Patents
Transmission type holographic storage medium and device Download PDFInfo
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- CN214671804U CN214671804U CN202121356391.2U CN202121356391U CN214671804U CN 214671804 U CN214671804 U CN 214671804U CN 202121356391 U CN202121356391 U CN 202121356391U CN 214671804 U CN214671804 U CN 214671804U
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Abstract
The utility model provides a transmission-type holographic storage medium and device, transmission-type holographic storage medium, including first base plate, second base plate, record bed and two to the chromatograph, the record bed is used for reading and writing the hologram that the light recording carried data information, and concave-convex structure is carved with on the surface of one side of second base plate orientation record bed and is used for servo beam location reading and writing position, realizes servo cable rail function simultaneously. The dichroic layer can reflect the servo beam and transmit the read-write light, and the thickness of the dichroic layer is between 600nm and 760 nm. According to the utility model discloses a storage medium is difficult for receiving external environment's influence, and is more stable for the holographic storage medium of traditional reflection type, and does not have the interval design between first base plate, second base plate, record level and the two to the chromatograph, need not design the record level respectively in the storage medium both sides just can realize two-sided reading and writing, and processing technology is simple.
Description
Technical Field
The present invention relates to the field of optical storage technology, and more particularly, to a transmissive holographic storage medium and apparatus.
Background
Holographic storage is a large-capacity storage mode for recording data on a holographic storage medium in a three-dimensional form, can meet the performance required by large-scale data storage in the 21 st century, is expected to replace magnetic storage and optical storage technologies, and becomes a next-generation high-capacity data storage technology.
In order to accurately position the holographic recording or reading position, a servo beam path is generally designed, an address is set on the holographic storage medium, and after the servo beam obtains information from an address layer, the servo beam is captured by a quadrant detector to obtain address information, so that the positioning of the servo beam on the reading and writing position is realized.
The information in the holographic storage is obtained through optical path access, wherein blue laser or green laser is used as a reference beam, and red laser is used as a servo beam. The blue laser or the green laser irradiates the grating stripe in the recording material, diffracts a signal beam, and the signal beam is captured and imaged by a camera. The red laser reads servo information from the address layer, and is finally captured by the four-image detector to obtain address information.
Holographic storage media reported at home and abroad are mostly reflective holographic storage media, for example, a holographic storage device based on color separation reflection disclosed in CN 207517357U, which mainly uses a dichroic layer and an address layer to respectively reflect a reference beam and a servo beam, thereby obtaining information. The dichroic layer and the address layer of the reflective storage medium are mostly separated, and a separation layer is arranged between the dichroic layer and the address layer, so that the structure of the reflective storage medium is complex, and the processing difficulty is increased. And the reflected servo light beam and the reflected read-write light beam are on the same side, so that the reflective storage medium is easy to interfere with each other and is easily influenced by external factors, such as the change of the read-write light wavelength and the incident angle. In addition, if the reflective holographic storage medium is to realize double-sided reading and writing, recording layers need to be respectively arranged on two sides of the storage medium, which further increases the processing difficulty and the instability of information reading and writing.
Therefore, there is a need to design a holographic storage medium such that recording and reading of holograms carrying data information is more stable and does not increase the processing difficulty.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at overcoming above-mentioned prior art's at least one kind defect (not enough), provide a transmission-type holographic storage medium and device for solve the stability problem and the processing problem of information reading and writing.
On the one hand, the utility model provides a transmission-type holographic storage medium, including first base plate, the second base plate, record level and two to the chromatograph, the record level is used for reading and writing the hologram that the light recording carried data information, concave-convex structure is carved with towards the surface of record level one side to the second base plate for servo beam location reads and writes the position, realizes servo lock rail function simultaneously, the even coating of two to the chromatograph is on the concave-convex structure surface of second base plate, two to the chromatograph can reflect servo beam and transmit and write light, and the thickness of two to the chromatograph is between 600nm-760 nm.
The reflective holographic storage medium reflects read-write light under the action of the dichroic layer, so that the grating direction in the reflective holographic storage medium is mainly parallel to the surface of the medium, the information reading process is easily influenced by wavelength, medium deformation and light path instability, and the reflective holographic storage medium is sensitive to external factors; and recording and reading are performed on the same side. The influence of environmental interference on the gratings in different directions can be different, wherein the influence of wavelength, medium deformation and light path instability on the information reading process of the hologram with the grating perpendicular to the surface of the medium is small. The utility model discloses a transmission-type holographic optical storage medium, its grating direction is mainly perpendicular to medium surface to reading and writing and record are carried out on the different sides. Therefore, the utility model provides an information reading process is difficult for receiving the influence of external environment, is more stable for traditional reflective holographic storage medium. Meanwhile, the first substrate, the second substrate, the recording layer and the dichroic layer of the holographic optical storage medium are not designed at intervals, so that double-sided reading and writing can be realized without respectively designing the recording layer on two sides of the storage medium, and the processing technology is simple. The reading and writing light is a reference light beam and/or a signal light beam. And the concave-convex structure is engraved on the surface of one side of the second substrate facing the recording layer, and the concave-convex structure is used for positioning the read-write position by the servo light beam and enabling the signal light or the reference light to move according to a certain track under the action of the servo system, so that the servo track locking function is realized.
Specifically, the dichroic layer is uniformly coated on the surface of the concave-convex structure of the second substrate.
According to the technical scheme, the first substrate of the storage medium is located on one side, away from the dichroic layer, of the recording layer, and the second substrate is located on one side, away from the recording layer, of the dichroic layer. The first substrate, the recording layer, the dichroic layer, and the second substrate are sequentially stacked. When recording a hologram, reference light and signal light incident from the first substrate or the second substrate interfere at the recording layer and expose the recording layer to generate a hologram; when the data information on the hologram is reproduced, the reference light is incident through the first substrate or the second substrate, passes through the recording layer and the dichroic layer, and finally passes through the second substrate or the first substrate, and the hologram carrying the data information is read on the other side of the medium.
The concave-convex structure on the surface of the second substrate in this embodiment may have various structures. The arrangement of the first substrate and the second substrate can protect the concave-convex structures on the surfaces of the recording layer and the second substrate from being damaged.
In the technical scheme, the concave-convex structure on the surface of the second substrate can be used for positioning the read-write position by the servo light beam, and meanwhile, the servo track locking function is realized, rather than independently arranging an address layer, so that the production process of the storage medium can be greatly simplified.
In another preferred embodiment, an anti-reflection layer is disposed on a side of the first substrate away from the recording layer, and an anti-reflection layer is disposed on a side of the second substrate away from the recording layer, so that the reflection of the reading/writing light or the servo light beam when passing through the first substrate and the second substrate can be reduced, and the reading/writing light or the servo light beam can pass through the first substrate and the second substrate as completely as possible.
In order to better protect the relief structure of the recording layer and the surface of the second substrate, the first substrate and the second substrate are preferably transparent thermoplastics, which do not deform, e.g. shrink, the relief structure of the recording layer and the surface of the second substrate.
In view of the characteristics of red, blue and green light, the servo beam is preferably a red laser, and the read-write beam is preferably a blue or green laser.
The utility model discloses another aspect still provides a transmission-type holographic storage device, including foretell transmission-type holographic storage medium, still include: the servo module is used for outputting a servo light beam, the servo light beam is reflected back by the dichroic layer to obtain address information, and the read-write position of the read-write light is positioned; and the read-write module is used for outputting read-write light, and when information is recorded, according to the read-write position positioned by the servo light beam, the signal light and the reference light which are taken as the read-write light directly interfere with each other on the recording layer to form a hologram, or the signal light and the reference light firstly transmit the dichroic layer and then interfere with each other on the recording layer to form the hologram.
The transmission type holographic storage device also comprises a signal output module, when information is read, the input reference beam is diffracted at the positioning position of the servo beam to reproduce the signal beam, the signal beam penetrates through the dichroic layer, and the information is read on the other side of the storage medium where the reference beam is incident.
The read-write module can be a single-arm structure for combining the signal beam and the reference beam and can also be a double-arm mechanism for separating the signal beam and the reference beam. For the single-arm structure, the read-write module specifically comprises a light source module for outputting read-write light; the beam combining module is used for converting input reading and writing light into coaxial signal beams and reference beams with orthogonal polarization directions; the optical head module is used for converting input coaxial signal beams and reference beams with orthogonal polarization directions into different axes, combining read-write light and servo beams, and directly interfering the signal beams and the reference beams on a recording layer to form a hologram or transmitting a dichroic layer to interfere the dichroic layer on the recording layer to form the hologram under the positioning action of the servo beams; and a signal output module for reproducing the signal beam by diffracting the input reference beam at the servo beam positioning position during information reading, wherein the reproduced signal beam is transmitted through the dichroic layer, and information is reproduced on the other side of the storage medium on which the reference beam is incident.
In the servo module, servo light beams are reflected back by the dichroic layer to obtain address information, the read-write position of the read-write light is positioned, and meanwhile, the read-write light is subjected to servo track locking to move according to a specific track.
Compared with the prior art, the beneficial effects of the utility model are that: according to the utility model discloses a storage medium is difficult for receiving external environment's influence, and is more stable for the holographic storage medium of traditional reflection type, and does not have the interval design between first base plate, second base plate, record level and the two to the chromatograph, need not design the record level respectively in the storage medium both sides just can realize two-sided reading and writing, and processing technology is simple.
Drawings
Fig. 1 is a schematic view of a structure of a transmissive holographic storage medium, in which a light beam is incident from a first substrate side.
Fig. 2 is a schematic structural view of a transmissive holographic storage medium, in which a light beam is incident from a side of a second substrate.
FIG. 3 is a schematic diagram of a transmissive holographic storage device.
Detailed Description
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.
Example 1
As shown in fig. 1, the present embodiment provides a transmissive holographic storage medium 600 having a first substrate 1, a recording layer 2, a dichroic layer 3, and a second substrate 4 sequentially disposed from top to bottom. The recording layer 2 is used for recording a hologram by the read-write light 5; the surface of the side, facing the recording layer 2, of the second substrate 4 is engraved with a concave-convex structure for positioning the reading and writing position by the servo light beam 7 and realizing the servo track locking function, the dichroic layer 3 is uniformly coated on the concave-convex structure surface of the second substrate 4, the dichroic layer 3 can reflect the servo light beam 7 and transmit the reading and writing light 5, and the thickness of the dichroic layer is preferably 600nm-760 nm.
The information reading process of the holograms with different grating directions is affected differently by environmental interference, wherein the information reading process of the holograms with the grating vertical to the medium surface is less affected by the environment. The present embodiment employs transmission type holographic optical storage, in which the grating direction is mainly perpendicular to the medium surface, and reading and writing and recording are performed on different sides. Therefore, the information reading process described in this embodiment is not easily affected by the external environment, and is more stable compared to the conventional reflective holographic storage medium. And there is no interval design among the first base plate 1, recording layer 2, dichroic layer 3 and the second base plate 4, do not need to design the recording layer 2 on both sides of the storage medium separately and can realize the double-sided reading and writing, the processing technology is simple. The reading and writing light 5 described in this embodiment is a reference beam and/or a signal beam.
The storage medium may be a disk storage medium or a card storage medium. The storage medium in this embodiment is a disk storage medium.
The concave-convex structure on the surface of the second substrate is composed of grooves or ridges, and the design of the structure determines the position of writing the holographic image into the recording layer. The relief structure may also be of other shapes.
In the transmissive holographic storage medium in this embodiment, the first substrate 1 is located on a side of the recording layer 2 away from the dichroic layer 3, and the second substrate 4 is located on a side of the dichroic layer 3 away from the recording layer 2, wherein a concave-convex structure is engraved on a surface of the second substrate. When recording a hologram, reference light and signal light incident from the first substrate or the second substrate interfere at the recording layer and expose the recording layer to generate a hologram; when the data information on the hologram is reproduced, the reference light is incident through the first substrate or the second substrate, passes through the recording layer and the dichroic layer, and finally passes through the second substrate or the first substrate, and the hologram carrying the data information is read on the other side of the medium. The provision of the first substrate 1 or the second substrate 4 can protect the recording layer and/or the concavo-convex structure from being damaged. In addition, in the technical scheme, the concave-convex structure on the surface of the second substrate can be directly used for positioning the read-write position by the servo light beam, and meanwhile, the servo track locking function is realized, rather than independently arranging an address layer, so that the production process can be simplified.
The first substrate 1 and the second substrate 4 in this embodiment are preferably transparent thermoplastic plastics, which can further enhance the stability of information reading and writing without deformation, such as shrinkage, of the concave-convex structures on the surfaces of the recording layer 2 and the second substrate.
In order to reduce the reflection of the read-write light 5 or the servo light beam 7 when transmitted through the first substrate 1 and the second substrate 4 and to increase the light transmission so that the read-write light or the servo light beam transmits as completely as possible through the first substrate 1 and the second substrate 4, an anti-reflection layer 8 is provided on the side of the first substrate 1 remote from the recording layer 2 and an anti-reflection layer 9 is provided on the side of the second substrate 4 remote from the recording layer.
Based on the characteristics of red, blue and green light, the servo light beam 7 in this embodiment is preferably a red laser, and the read-write light 5 is preferably a blue or green laser. If necessary, light of other wavelengths may be used as the servo light beam 7 and the read/write light 5.
That is, the upper surface of the recording layer 2 in this embodiment is covered by the first substrate 1, the lower surface is in contact with the dichroic layer 3, the surface of the second substrate 4 on the side facing the recording layer 2 is engraved with a concave-convex structure, the dichroic layer 3 is uniformly coated on the concave-convex structure surface of the second substrate 4, and the side of the first substrate 1 away from the recording layer and the side of the second substrate 4 away from the recording layer are uniformly coated with the antireflection layers 8, 9, respectively, to increase the transmittances of the reading and writing light 5 and the servo beam 7 at the first substrate 1 and the second substrate 4. The dichroic layer 3 is designed to transmit the read-write light 5 and to reflect the servo beam 7, thereby enabling transmissive reading of the hologram carrying the data information, and one recording layer enables dual-sided reading of the storage medium.
Referring to fig. 1 again, during hologram recording, when blue or green read-write light 5 and a red servo light beam 7 respectively enter at one side of the first substrate 1, the servo light beam 7 sequentially penetrates through the anti-reflection layer 8, the first substrate 1 and the recording layer 2, reaches the dichroic layer 3 to obtain address information, and is reflected back by the dichroic layer 3, the read-write light 5 is a signal light beam and a reference light beam, and after the signal light beam and the reference light beam penetrate through the first substrate 1 and the anti-reflection layer 8, the signal light beam and the reference light beam interfere at the positioning position of the servo light beam 7 in the recording layer 2 to form a hologram. When the hologram is reproduced, a reference beam 5 and a servo beam 7 are input at the same side, the servo beam 7 is reflected by the dichroic layer 3 after acquiring address information, and sequentially penetrates through the recording layer 2, the first substrate 1 and the anti-reflection layer 8, and is collected for signal processing to acquire the address information; the reference beam 5, after passing through the anti-reflection layer 8 and the first substrate 1, diffracts the reproduction signal beam at the position where the servo beam 7 is located in the recording layer 2, the reproduction signal beam is transmitted through the dichroic layer 3, the second substrate 4 and the anti-reflection layer 9 in that order, and the hologram carrying the data information is reproduced on the other side where the beam is incident, i.e., on the side of the second substrate 4.
Referring to fig. 2, when the blue or green read-write light 5 and the red servo light beam 7 are incident on one side of the second substrate 4, respectively, the servo light beam 7 sequentially transmits through the anti-reflection layer 9 and the second substrate 4, is reflected by the dichroic layer 3, sequentially transmits through the second substrate 4 and the anti-reflection layer 9, and is collected to perform signal processing to obtain address information; the signal beam and the reference beam are transmitted through the antireflection layer 9, the second substrate 4, and the dichroic layer 3 in this order, and then interfered at the servo beam positioning position in the recording layer 2 to form a hologram. When the hologram is reproduced, the reference beam 5 and the servo beam 7 are input at the same side, the servo beam 7 is reflected by the dichroic layer 3 after passing through the anti-reflection layer 9 and the second substrate 4, then passes through the second substrate 4 and the anti-reflection layer 9, and is collected for signal processing to acquire address information; the reference beam 5, after passing through the anti-reflection layer 9, the second substrate 4 and the dichroic layer 3, diffracts the reproduction signal beam at the position where the servo beam is positioned in the recording layer 2, and after the reproduction signal beam is transmitted through the first substrate 1 and the anti-reflection layer 8, the hologram carrying the data information is reproduced on the other side where the beam is incident, i.e., the first substrate 1 side.
According to the storage medium of the embodiment, because the grating perpendicular to the incident surface is generated, the information reading process is not easily affected by the external environment, and is more stable compared with the traditional reflective holographic storage medium, and the first substrate, the recording layer, the dichroic layer and the second substrate are not designed at intervals, so that double-sided reading and writing can be realized without respectively designing the recording layers on two sides of the storage medium, and the processing difficulty is not increased.
Example 2
As shown in fig. 3, the present embodiment provides a transmissive holographic storage device, including the transmissive holographic storage medium 600 described in embodiment 1, further including: a servo module 300 for outputting a servo beam; a light source module 100 for outputting reading and writing light; a beam combining module 200 for converting the input reading and writing light into coaxial signal beams and reference beams with orthogonal polarization directions; the optical head module 400 is used for converting input coaxial signal beams and reference beams with orthogonal polarization directions into non-coaxial beams, combining the read-write light and the servo beams, and directly performing interference exposure on the signal beams and the reference beams to form a hologram in the recording layer 2 or transmitting the dichroic layer 3 firstly and then performing interference exposure on the recording layer 2 to form a hologram under the positioning action of the servo beams; and a signal output module 500, wherein when information is read, the input reference beam is diffracted at the positioning position of the servo beam, the signal beam is reproduced, the signal beam is transmitted through the dichroic layer 3, and the information is read on the other side of the storage medium where the reference beam is incident.
The signal optical path and the reference optical path in the optical path structure adopted in this embodiment are combined into one, and are in a single-arm structure, and are also applicable to an optical path structure in which the signal optical path and the reference optical path are in a double-arm structure.
It should be understood that the above-mentioned 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 (8)
1. A transmission type holographic storage medium is characterized by comprising a first substrate, a second substrate, a recording layer and a dichroic layer, wherein the recording layer is used for reading and writing a hologram carrying data information, a concave-convex structure is engraved on the surface of one side, facing the recording layer, of the second substrate and used for positioning a reading and writing position through a servo light beam and realizing a servo track seeking function, the dichroic layer can reflect the servo light beam and transmit the reading and writing light, and the thickness of the dichroic layer is 600nm-760 nm.
2. The transmissive holographic storage medium of claim 1, in which the dichroic layer is uniformly coated on the relief-structured surface of the second substrate.
3. The transmissive holographic storage medium of claim 2, wherein the first substrate is positioned on a side of the recording layer away from the dichroic layer, and the second substrate is positioned on a side of the dichroic layer away from the recording layer, and when the hologram is recorded, the reference light and the signal light incident from the first substrate or the second substrate interfere at the recording layer and expose the recording layer to light to generate the hologram; when the data information on the hologram is reproduced, the reference light is incident through the first substrate or the second substrate, passes through the recording layer and the dichroic layer, and finally passes through the second substrate or the first substrate, and the holographic information is read on the other side of the medium.
4. A transmissive holographic storage medium according to claim 3, wherein an anti-reflection layer is provided on a side of the first substrate remote from the recording layer, while an anti-reflection layer is provided on a side of the second substrate remote from the recording layer.
5. The transmissive holographic storage medium of claim 1, in which the servo beam is a red laser and the read-write beam is a blue laser.
6. The transmissive holographic storage medium of claim 1, in which the servo beam is a red laser and the read and write are green lasers.
7. A transmissive holographic storage device comprising the transmissive holographic storage medium of claim 1, and further comprising
The servo module is used for outputting a servo light beam, the servo light beam is reflected back to the obtained address information through the dichroic layer, and the read-write position of the read-write light is positioned;
and the read-write module is used for outputting read-write light, and when information is recorded, according to the read-write position positioned by the servo light beam, the signal light and the reference light which are taken as the read-write light directly interfere with each other on the recording layer to form a hologram, or the signal light and the reference light firstly transmit the dichroic layer and then interfere with each other on the recording layer to form the hologram.
8. The transmissive holographic storage device of claim 7, further comprising a signal output module, wherein when reading information, the input reference beam is diffracted at the servo beam positioning position to reproduce the signal beam, the signal beam is transmitted through the dichroic layer, and reading information is performed on the other side of the storage medium on which the reference beam is incident.
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Effective date of registration: 20230718 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: 514779 in Guangzhou (Meizhou) industrial transfer park, Yujiang Town, Meixian County, Meizhou City, Guangdong Province Patentee before: GUANGDONG AMETHYST INFORMATION STORAGE TECHNOLOGY CO.,LTD. |