WO2014116194A1 - Data readout system from optical media - Google Patents
Data readout system from optical media Download PDFInfo
- Publication number
- WO2014116194A1 WO2014116194A1 PCT/UA2014/000016 UA2014000016W WO2014116194A1 WO 2014116194 A1 WO2014116194 A1 WO 2014116194A1 UA 2014000016 W UA2014000016 W UA 2014000016W WO 2014116194 A1 WO2014116194 A1 WO 2014116194A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- optical
- substrate
- plate
- mono
- crystalline
- Prior art date
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 69
- 239000000758 substrate Substances 0.000 claims abstract description 44
- 229910052594 sapphire Inorganic materials 0.000 claims abstract description 20
- 239000010980 sapphire Substances 0.000 claims abstract description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000010453 quartz Substances 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 14
- 239000013078 crystal Substances 0.000 claims description 8
- 238000003860 storage Methods 0.000 abstract description 8
- 230000007774 longterm Effects 0.000 abstract description 7
- 239000002178 crystalline material Substances 0.000 abstract description 4
- 238000013500 data storage Methods 0.000 abstract 2
- 230000004075 alteration Effects 0.000 description 7
- 239000010410 layer Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 229920000106 Liquid crystal polymer Polymers 0.000 description 3
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 229920006125 amorphous polymer Polymers 0.000 description 2
- 201000009310 astigmatism Diseases 0.000 description 2
- 239000005357 flat glass Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
Definitions
- the present invention relates to information technology and can be used in playback systems of digital media long-term storage.
- a data playback apparatus for reproduction of data from an optical recording medium which has a data layer disposed on a substrate thereof having a specific thickness is provided with an optical length corrector interposed between the recording medium and an objective lens for converging a light beam [1].
- the optical length corrector is selected so that the sum of the optical length of the substrate of the recording medium and the optical length of the optical length corrector equals a predetermined length for the objective lens. Accordingly, the light passing the objective lens can converge on the data layer developing a light spot close to the limit of refraction, regardless of the thickness of the substrate of the recording medium.
- an optical head apparatus of an optical information recording/reproducing apparatus is provided with a light source [2].
- An objective lens focuses an output light emitted by said light source on a disc optical recording medium for which a groove or a pit for tracking is provided.
- T photo-detector receives a reflected light reflected by said optical recording medium.
- a polarizing splitter unit splits said output light and said reflected light.
- a quarter-wave plate disposed between said polarizing splitter section and said objective lens.
- a birefringence compensating unit reduces a change in an amplitude of a track error signal caused by birefringence in a protective layer of said optical recording medium.
- An optical head device and optical information recording/reproducing device are known [3].
- a birefringence correction element having a first birefringence correcting section consisting of a liquid crystal polymer layer and electrodes, a second birefringence correcting section consisting of a liquid crystal polymer layer and electrodes, and a third birefringence correcting section consisting of a liquid crystal polymer layer and electrodes is provided.
- the first birefringence correcting section corrects the impact of vertical birefringence of the protective layer in an optical recording medium variable depending on the kind of an optica] recording medium
- the second and third birefringence correcting sections correct the impact of the recording medium protective layer in-plane birefringence that varies by the kind of the optical recording medium.
- optical pickup head applied in angular measurement, which uses a 45 DEG plate glass to generate an astigmatic optical pickup head that is used in combination with an atomic microscope to proceed angular measurement.
- the device of optical pickup head includes a laser diode, a 45 DEG plate glass, a collimating lens, a reflector, an object lens, a tracking starter and a quadrant detector (PDIC), wherein the quadrant detector is employed to detect signals, and the offset relation between the signals and the surface under test is determined to confirm the relation between the displacement/angle and the change of the signals [4].
- PDIC quadrant detector
- the optical diffraction element for raising optical head storing density included one circular main body and one base seat fixed to the outer end of the main body.
- the main body consists of one central bright ultraviolet ray transmitting circle, one middle dark ultraviolet ray non-transparent ring and one outer bright ring, with the outer diameter of the outer bright ring, the dark ring outer diameter and the dark ring inner diameter having the ratio of 2 to 1.9 to 0.08.
- the main body has diameter near that of the optical head objective.
- the dark ring is made of chromium and the bright circle and the bright ring are made of quartz glass.
- the dark ring has thickness of 10-50 microns.
- the optical diffraction element of the present invention can reduce record light sport size to raise the storing density by 1 0- 1 % [5].
- Known data readout system from optical media consists of laser beam splitting cube, focusing lens, the quarter wave plate and sensor.
- focusing lens By focusing lens, the continuous light irradiation is focused to the laser spot on the surface of micron size medium and reflected from the information modulated carrier the reproduced beam is directed to a photo-detector which generates the reading and auto-focusing (AF) signals [6].
- AF auto-focusing
- analogue device [7] there were partly remedied some deficiencies in the system of reading data from an optical medium that consists of a laser, focusing lens, beam splitting cube the quarter plate many surface photo- detector and additionally comprises a diffraction grating installed immediately after the laser.
- the presence of diffraction grating and many surface photo- detectors allow signals to form automatic-tracking.
- the disadvantage of the prototype is that the system is also sensitive to reading the birefringence.
- the systems for data readout from optical media [7] can be used to playback the data when the substrate optical carrier is made of amorphous polymer (e.g., polycarbonate) because in this material the birefringence is negligibly small and almost independent on the angle of incidence of the beam on the optical reader media. It is known that optical media substrates made of amorphous polymers are not suitable for long-term storage.
- amorphous polymer e.g., polycarbonate
- the aim of the invention is to improve the accuracy and reliability of playback of optical media with highly stable birefringent mono-crystalline materials that provide long-term storage.
- phase distortion of light with extraordinary polarization (p-polarization)
- p-polarization the superposition of astigmatism and spherical aberrations of different orders.
- the particular phase distortion leads to the fact that s-and p-polarized light will be focused at different depths and the distance between the two foci AF is defined as follows:
- An is the difference between the refractive indices of ordinary (n 0 ) and extraordinary (n e ) beam
- h is thickness of the substrate optical media
- the distance between the spots is several times higher than the spot size. This makes it impossible to reliably reproduce the recorded data.
- the goal is achieved by the fact that the known system to readout data from an optical medium that consists of a laser, focusing lens, beam splitting cube many surface photo-detector sensor , the quarter plate and the diffraction grating between the focusing lens and carrier information is available mono-crystalline plate, which has a inverse value of the difference refractive indices of the ordinary and extraordinary rays to the value of the difference of the refractive indices of the ordinary and extraordinary rays of high- single-crystal material, such as sapphire, the substrate of the optical carrier. Since in the readout process, the optical disk medium is being rotated around its axis, and the compensating plate is fixed, the method can be realized only in the vertical orientation of the optical axis of the material of the optical drive and compensating plate.
- the main technical solution is that the effect of focusing the laser radiation with different polarizations in spots that are due to the different refractive indices of ordinary and extraordinary rays, separated by a depth of focus is eliminated by passing a laser beam through an extra plate.
- a sapphire which is a highly mono-crystalline material from which the substrates can be made for long- term storage media, we have:
- H spf and ⁇ are the thickness of high-stable single-crystal substrate of sapphire and quartz compensating plate, respectively.
- the compensating plate should have a refractive index close to the refractive index of the substrate optical disk- Accordingly, the second main condition on the choice of material from which must be made the compensating plate for reading out system from optical media is that the value of the refractive index of the material compensating plate n com was close to the value of the refractive index of the substrate optical media n sub .
- the first equation is the condition of compensation of astigmatism
- the second one is related to spherical aberration of the plane-parallel layer
- the third is the condition of sufficient compensation of aberrations of more higher orders
- H mm is the total thickness of the sapphire substrate and the quartz compensating plate.
- quartz compensating plate thickness and the thickness of the sapphire substrate must have a value within the range 0,62 ⁇ 0,72. When the value of the ratio is beyond this range, there wil l be a significant distortion of the focused beam.
- the thickness of the substrate should preferably be selected from the range 0,6 ⁇ 2 mm, whose boundaries were selected on grounds that when the thickness of the substrate optical media of less than 0.6 mm, the design will have low mechanical strength and manufacturing technology which is a significant problem as well.
- the thickness of the substrate should preferably be selected from the range 0,6 ⁇ 2 mm, whose boundaries were selected on grounds that when the thickness of the substrate optical media of less than 0.6 mm, the design will have low mechanical strength and manufacturing technology which is a significant problem as well.
- their weight dramatically increases and deteriorates entire performance of optical system and it is sensitive to the inclination of the surface of the disk relative to its axis.
- the thickness of the quartz plate should be 0.2 - 0.6 mm.
- FIG. there is presented an optical scheme of data readout system from optical media.
- the laser radiation which is generated by laser LED (1), through a diffraction grating (2), the quarter-wave plate (5) and beam splitting cube (3) is directed to the focusing lens (6).
- the focusing lens (6) focuses the laser light through the compensating plate (7) and the substrate carrier (8) on the relief structure of information carrier.
- the presence of mono-crystalline compensating plate leads to that the normal and extraordinary rays are focused in depth focus on a single plane.
- the FIG. demonstrates the distribution of normal (solid line) and odd (dashed line) rays when passing through the compensating plate of mono- crystalline quartz and highly stable optical carrier mono-crystalline substrate of sapphire. Variations in the extraordinary ray propagation through the optical substrate carrier offset decline in the opposite direction when passing through the compensating plate, which can reduce the influence of the birefringence in optical storage media substrates to a minimum.
- the material substrate of optical media for long-term storage can be used sapphire or quartz.
- sapphire AI )
- quartz plate Si( ) 2
- sapphire Al 0 3
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Head (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
The invention relates to information technology and can be used in systems of archival data storage. The proposed system relates to readable data system which gets the information from the optical disk WORM- type (one-time recording and re-reading) where the substrate is made of a highly- stable mono-crystalline material. Given system of archival data storage consists of a laser, focusing lens, beam splitting cube many surface photo-detector sensor, a diffraction grating and the quarter-wave plate. The system is distinguished from others in that that between the focusing lens and carrier information is available a mono-crystalline plate, which has a inverse value of the difference of the refractive indices of the ordinary and extraordinary rays to the value of the difference of the refractive indices of the ordinary and extraordinary rays for substrate of optical disk. For a highly stable optical disc substrate material for long-term storage and compensating plate for reading out optical systems is proposed to use sapphire or quartz.
Description
Data readout system from optical media
The present invention relates to information technology and can be used in playback systems of digital media long-term storage.
Known a data playback apparatus for reproduction of data from an optical recording medium which has a data layer disposed on a substrate thereof having a specific thickness is provided with an optical length corrector interposed between the recording medium and an objective lens for converging a light beam [1]. The optical length corrector is selected so that the sum of the optical length of the substrate of the recording medium and the optical length of the optical length corrector equals a predetermined length for the objective lens. Accordingly, the light passing the objective lens can converge on the data layer developing a light spot close to the limit of refraction, regardless of the thickness of the substrate of the recording medium.
Known an optical head apparatus of an optical information recording/reproducing apparatus is provided with a light source [2]. An objective lens focuses an output light emitted by said light source on a disc optical recording medium for which a groove or a pit for tracking is provided. T photo-detector receives a reflected light reflected by said optical recording medium. A polarizing splitter unit splits said output light and said reflected light. A quarter-wave plate disposed between said polarizing splitter section and said objective lens. A birefringence compensating unit reduces a change in an amplitude of a track error signal caused by birefringence in a protective layer of said optical recording medium.
An optical head device and optical information recording/reproducing device are known [3]. In front of the objective lens of an optical head deice, a birefringence correction element having a first birefringence correcting section consisting of a liquid crystal polymer layer and electrodes, a second birefringence correcting section consisting of a liquid crystal polymer layer and electrodes, and a third birefringence correcting section consisting of a liquid crystal polymer layer and electrodes is provided. The first birefringence correcting section corrects the
impact of vertical birefringence of the protective layer in an optical recording medium variable depending on the kind of an optica] recording medium, and the second and third birefringence correcting sections correct the impact of the recording medium protective layer in-plane birefringence that varies by the kind of the optical recording medium.
Known an optical pickup head applied in angular measurement, which uses a 45 DEG plate glass to generate an astigmatic optical pickup head that is used in combination with an atomic microscope to proceed angular measurement. The device of optical pickup head includes a laser diode, a 45 DEG plate glass, a collimating lens, a reflector, an object lens, a tracking starter and a quadrant detector (PDIC), wherein the quadrant detector is employed to detect signals, and the offset relation between the signals and the surface under test is determined to confirm the relation between the displacement/angle and the change of the signals [4].
Known the optical diffraction element for raising optical head storing density included one circular main body and one base seat fixed to the outer end of the main body. The main body consists of one central bright ultraviolet ray transmitting circle, one middle dark ultraviolet ray non-transparent ring and one outer bright ring, with the outer diameter of the outer bright ring, the dark ring outer diameter and the dark ring inner diameter having the ratio of 2 to 1.9 to 0.08. The main body has diameter near that of the optical head objective. The dark ring is made of chromium and the bright circle and the bright ring are made of quartz glass. The dark ring has thickness of 10-50 microns. The optical diffraction element of the present invention can reduce record light sport size to raise the storing density by 1 0- 1 % [5].
Known data readout system from optical media consists of laser beam splitting cube, focusing lens, the quarter wave plate and sensor. By focusing lens, the continuous light irradiation is focused to the laser spot on the surface of micron size medium and reflected from the information modulated carrier the reproduced beam is directed to a photo-detector which generates the reading and auto-focusing
(AF) signals [6]. The downside of this technical solution ( analog ) is that such a system can not generate the automatic-tracking signal and is sensitive to optical birefringence in the substrate carrier, and therefore the values of birefringence in the substrate CDs are under stringent requirements ( An = n0 - nc = 10"4 ).
In the prototype analogue device [7], there were partly remedied some deficiencies in the system of reading data from an optical medium that consists of a laser, focusing lens, beam splitting cube the quarter plate many surface photo- detector and additionally comprises a diffraction grating installed immediately after the laser. The presence of diffraction grating and many surface photo- detectors allow signals to form automatic-tracking. The disadvantage of the prototype is that the system is also sensitive to reading the birefringence.
The systems for data readout from optical media [7] can be used to playback the data when the substrate optical carrier is made of amorphous polymer (e.g., polycarbonate) because in this material the birefringence is negligibly small and almost independent on the angle of incidence of the beam on the optical reader media. It is known that optical media substrates made of amorphous polymers are not suitable for long-term storage.
For long-term storage of information, there is used high-single-crystal substrate materials, most of which have large birefringence [8]. But when the substrate of the optical carrier is made of a highly mono-crystalline material then the utilization of the (both analogue and prototype) reading systems is not possible, because the single-crystal material birefringence value begins to affect the accuracy and reliability of the data read from optical media.
The aim of the invention is to improve the accuracy and reliability of playback of optical media with highly stable birefringent mono-crystalline materials that provide long-term storage.
When the laser radiation having a spherical wave-front falls on the mono- crystalline substrate then there arise a phase distortion of light with extraordinary polarization (p-polarization), which is the superposition of astigmatism and
spherical aberrations of different orders. The particular phase distortion leads to the fact that s-and p-polarized light will be focused at different depths and the distance between the two foci AF is defined as follows:
Δ/ = 2h n I n0 ,
where An is the difference between the refractive indices of ordinary (n0) and extraordinary (ne) beam, h is thickness of the substrate optical media.
When focusing through a highly mono-crystalline substrate with thickness of I mm, the distance between the spots is several times higher than the spot size. This makes it impossible to reliably reproduce the recorded data.
The goal is achieved by the fact that the known system to readout data from an optical medium that consists of a laser, focusing lens, beam splitting cube many surface photo-detector sensor , the quarter plate and the diffraction grating between the focusing lens and carrier information is available mono-crystalline plate, which has a inverse value of the difference refractive indices of the ordinary and extraordinary rays to the value of the difference of the refractive indices of the ordinary and extraordinary rays of high- single-crystal material, such as sapphire, the substrate of the optical carrier. Since in the readout process, the optical disk medium is being rotated around its axis, and the compensating plate is fixed, the method can be realized only in the vertical orientation of the optical axis of the material of the optical drive and compensating plate.
The main technical solution is that the effect of focusing the laser radiation with different polarizations in spots that are due to the different refractive indices of ordinary and extraordinary rays, separated by a depth of focus is eliminated by passing a laser beam through an extra plate. For example, a sapphire, which is a highly mono-crystalline material from which the substrates can be made for long- term storage media, we have:
bnspf = n0 - ne = 1.78038 - 1, 77206 = 0.00832 = 8■ 10-3 .
Studies of the available supplies high-existing transparent uneasily optical crystals have shown that, in the case of sapphire substrate, the substance would be
the best material to compensate all the aberrations are quartz, which has the following values of the refractive indices ¾= 1 ,5443, «e= 1 ,5534, the difference between them is:
Anhr = 1, 5443 - 1, 5534 = -9 · 10'3 ,
Thus, there is inverse value of the refractive indices of ordinary and extraordinary rays to the values of the refractive indices of ordinary and extraordinary rays for the sapphire substrate.
The conditions of astigmatic aberration compensation is recorded as
Where H spf and ^ are the thickness of high-stable single-crystal substrate of sapphire and quartz compensating plate, respectively.
Higher order aberrations will be fully compensated when the material substrate of the optical drive and compensating plate have the same refractive index for the ordinary ray. Otherwise, the compensation will be partial. Therefore, to obtain diffraction limited optical system, the compensating plate should have a refractive index close to the refractive index of the substrate optical disk- Accordingly, the second main condition on the choice of material from which must be made the compensating plate for reading out system from optical media is that the value of the refractive index of the material compensating plate ncom was close to the value of the refractive index of the substrate optical media nsub .
Thus, the conditions for getting the optical system with minimal residual aberrations for the optical disk using high-stable-single-crystal substrate of sapphire and the single-crystal quartz compensating plate can be written as:
1) Kkvr I Hspf = 0.62 ÷ 0.72,
2) Hk r + Hspf = Hsun ± 5%
where the first equation is the condition of compensation of astigmatism, the second one is related to spherical aberration of the plane-parallel layer, the third is the condition of sufficient compensation of aberrations of more higher orders, Hmm is the total thickness of the sapphire substrate and the quartz compensating plate.
The values of quartz compensating plate thickness and the thickness of the sapphire substrate must have a value within the range 0,62 ÷ 0,72. When the value of the ratio is beyond this range, there wil l be a significant distortion of the focused beam.
The thickness of the substrate should preferably be selected from the range 0,6 ÷ 2 mm, whose boundaries were selected on grounds that when the thickness of the substrate optical media of less than 0.6 mm, the design will have low mechanical strength and manufacturing technology which is a significant problem as well. For structures with a thickness of substrate greater than 2 mm in dimensions, their weight dramatically increases and deteriorates entire performance of optical system and it is sensitive to the inclination of the surface of the disk relative to its axis.
In Table, there are examples of structural parameters (thicknesses) of a sapphire disk substrate and the quartz plate compensating for optical discs for various formats. The thickness of the quartz compensating plate depends on the thickness of the sapphire substrate, and this should be driven by the manufacture of quartz compensating plate.
Table
Sapphire substrate thickness and quartz compensating plate for optical discs in various formats
To read data from a CD with sapphire substrate having a thickness of 0,714 mm, it is necessary to use a compensating quartz plate with thickness of 0.486 mm, and for reading out data from a DVD with sapphire substrate having a thickness of 0.357 mm, it is necessary to use a compensating quartz plate with thickness of 0.243 mm.
In case of optical media of sapphire substrates when a record was made in a variety of formats (CD, DVD, etc.), the thickness of the quartz plate should be 0.2 - 0.6 mm.
In FIG., there is presented an optical scheme of data readout system from optical media. During playback the laser radiation, which is generated by laser LED (1), through a diffraction grating (2), the quarter-wave plate (5) and beam splitting cube (3) is directed to the focusing lens (6). The focusing lens (6) focuses the laser light through the compensating plate (7) and the substrate carrier (8) on the relief structure of information carrier. The presence of mono-crystalline compensating plate leads to that the normal and extraordinary rays are focused in depth focus on a single plane.
The FIG. demonstrates the distribution of normal (solid line) and odd (dashed line) rays when passing through the compensating plate of mono- crystalline quartz and highly stable optical carrier mono-crystalline substrate of sapphire. Variations in the extraordinary ray propagation through the optical substrate carrier offset decline in the opposite direction when passing through the compensating plate, which can reduce the influence of the birefringence in optical storage media substrates to a minimum.
The material substrate of optical media for long-term storage can be used sapphire or quartz. In the event when as a material for the manufacture of optical media substrates is used sapphire ( AI ), ) then for preparation of he compensating plate should be applied quartz plate ( Si() 2 ) and vice versa, when, as a substrate material for the manufacture of optical media is used quartz ( Si02 ) then for the manufacture of the compensating plate should be used sapphire ( Al 03 ).
Citation:
1. US 5097464 A, published on 17.03.1992, [PC Gl 1B7/135, Gl 1B 1 1/10, Gl 1B7/09, Gl 1 B7/004, Gl 1B7/14, Gl 1B7/00, G l 1 B l 1/105, G1 1B7/24.
2. US 20090046548 Al , published on 19.02.2009, IPC G l 1B7/135, G1 1 B7/00.
3. US 20100085495 Al , published on 08.04.2010, IPC Gl 1B7/135, G02F1/13.
4. TW 200905675 A, published on 0 1 .02.2009, IPC G l 1 B20/00, Gl 1B7/13.
5. CN 1715963 A, published on 04.01 .2006, IPC G02B5/18, G1 1B7/135, G1 1B7/1353.
6. The compact disk handbook, 2nd ed./ Ken C. Pohlmann. - Madison, Wisconsin. A-R Editions, Inc., 1992. - p. 349.
7. EP0731457 B 1 , published on 15.08.2005, IPC Gl 1B7/12, Gl 1B7/135, Gl 1B7/0037, Gl 1 B7/125, Gl 1B7/004, Gl 1B7/22,
G 1 1 B7/00, G 1 1 B 7/09, G 1 1 B 19/ 12.
8. UA 7361 1 , published on 15.08.2005, IPC (2006. 1 ) Gl IB 7/00, Gl IB 7/24.
Claims
1 . System for reading out data from optical media, which consists of a laser, focusing lens, beam splitting cube, many surface photo-detector sensor, a diffraction grating, the quarter-wave plate, wherein between the focusing lens and carrier information is available a mono-crystalline plate that has inverse value of the difference of the refractive indices of the ordinary and extraordinary rays relative to the value of the difference of the refractive indices of the ordinary and extraordinary rays for a highly mono-crystalline substrate material optical media.
2. System for reading out data from optical media of claim 1 , wherein the compensating plate made of mono-crystalline quartz having the thickness 62. . .72% of the thickness of single-crystal sapphire substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201480018066.1A CN105122366A (en) | 2013-01-28 | 2014-01-28 | Data readout system from optical media |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| UA2013001017 | 2013-01-28 | ||
| UAA201301017 | 2013-01-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2014116194A1 true WO2014116194A1 (en) | 2014-07-31 |
| WO2014116194A4 WO2014116194A4 (en) | 2014-10-30 |
Family
ID=50514033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/UA2014/000016 WO2014116194A1 (en) | 2013-01-28 | 2014-01-28 | Data readout system from optical media |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN105122366A (en) |
| WO (1) | WO2014116194A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105513618A (en) * | 2015-11-24 | 2016-04-20 | 浙江工业大学义乌科学技术研究院有限公司 | Aberration compensation method for sapphire substrate optical disc data reading system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106504774A (en) * | 2016-12-30 | 2017-03-15 | 苏州爱彼光电材料有限公司 | Sapphire information storage cd-rom and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5668786A (en) * | 1995-04-19 | 1997-09-16 | Hitachi, Ltd. | Magneto-optic disk apparatus having means for eliminating fluctuation component in reproduction magneto-optic signal |
| US20010021162A1 (en) * | 1999-12-20 | 2001-09-13 | Ikuya Kikuchi | Optical pickup and information recording and/or reproducing apparatus including the same |
| US6487160B1 (en) * | 1999-03-18 | 2002-11-26 | Pioneer Corporation | Optical pickup, information recording apparatus and information reproducing apparatus |
| JP2004245957A (en) * | 2003-02-12 | 2004-09-02 | Mitsumi Electric Co Ltd | Wavelength plate and optical pickup |
| CN101199010B (en) * | 2005-06-17 | 2010-11-10 | 日立麦克赛尔株式会社 | Optical pickup device and birefringence correction plate |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100230250B1 (en) * | 1994-12-26 | 1999-11-15 | 윤종용 | Method and apparatus for correcting aberration by tilting optical disc |
| UA73611C2 (en) * | 2003-04-25 | 2005-08-15 | Inst Of Information Recording | Permanent data carrier |
| CN100449623C (en) * | 2003-10-31 | 2009-01-07 | 巨擘科技股份有限公司 | Optical disk substrate, optical disk and manufacturing method thereof |
| TW200615934A (en) * | 2004-10-20 | 2006-05-16 | Hitachi Maxell | Pickup lens with phase compensator and optical pickup apparatus using the same |
| CN100363999C (en) * | 2005-05-19 | 2008-01-23 | 巨擘科技股份有限公司 | Optical disc substrate and optical disc |
| JP5228559B2 (en) * | 2008-03-25 | 2013-07-03 | ソニー株式会社 | Image display device and optical compensation device |
| CN101435698B (en) * | 2008-12-17 | 2010-08-25 | 天津大学 | Method and system for measuring surface appearance of micro-device under transparent encapsulation medium |
-
2014
- 2014-01-28 CN CN201480018066.1A patent/CN105122366A/en active Pending
- 2014-01-28 WO PCT/UA2014/000016 patent/WO2014116194A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5668786A (en) * | 1995-04-19 | 1997-09-16 | Hitachi, Ltd. | Magneto-optic disk apparatus having means for eliminating fluctuation component in reproduction magneto-optic signal |
| US6487160B1 (en) * | 1999-03-18 | 2002-11-26 | Pioneer Corporation | Optical pickup, information recording apparatus and information reproducing apparatus |
| US20010021162A1 (en) * | 1999-12-20 | 2001-09-13 | Ikuya Kikuchi | Optical pickup and information recording and/or reproducing apparatus including the same |
| JP2004245957A (en) * | 2003-02-12 | 2004-09-02 | Mitsumi Electric Co Ltd | Wavelength plate and optical pickup |
| CN101199010B (en) * | 2005-06-17 | 2010-11-10 | 日立麦克赛尔株式会社 | Optical pickup device and birefringence correction plate |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105513618A (en) * | 2015-11-24 | 2016-04-20 | 浙江工业大学义乌科学技术研究院有限公司 | Aberration compensation method for sapphire substrate optical disc data reading system |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2014116194A4 (en) | 2014-10-30 |
| CN105122366A (en) | 2015-12-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1724771B1 (en) | Optical recording and reproducing apparatus, optical head, optical recording and reproducing method and skew detection method | |
| US6930972B2 (en) | Optical information processor and optical element | |
| US7933188B2 (en) | Optical pickup | |
| EP2040255B1 (en) | Optical information reproducing method and optical information reproducing device | |
| US7233562B2 (en) | Optical pickup device | |
| JP4527591B2 (en) | Information recording / reproducing method and information recording / reproducing apparatus | |
| WO2014116194A1 (en) | Data readout system from optical media | |
| JP2001176114A (en) | Pickup device and information recording/reproducing device | |
| JP5417331B2 (en) | Optical disc apparatus, optical head, and information processing apparatus | |
| US7898919B2 (en) | Optical pickup apparatus | |
| US20080212418A1 (en) | Optical disc device | |
| US6400670B1 (en) | Device for the writing and/or reading of optical recording media of various structures | |
| EP1905028A4 (en) | ACTIVE COMPENSATION DEVICE, COMPATIBLE OPTICAL READING HEAD AND OPTICAL RECORDING AND / OR PLAYING DEVICE WITH THE ACTIVE COMPENSATION DEVICE | |
| US8165002B2 (en) | Optical pickup apparatus and objective lens | |
| EP1351228B1 (en) | Device for correcting signal modulations | |
| JP2007317266A (en) | Diffraction grating, isolator and optical pickup device | |
| KR100551777B1 (en) | Optical recording and playback device with corrected chromatic aberration | |
| JP4380339B2 (en) | Phase variable aberration correcting optical element and optical pickup device | |
| JP2001297477A (en) | Integrated unit and optical pickup device using the same | |
| JP4732289B2 (en) | Optical pickup device | |
| JPWO2009014093A1 (en) | Synthetic resin lens manufacturing method, modified synthetic resin material manufacturing method, and optical pickup device | |
| EP1561211A1 (en) | Optical scanning device | |
| JP2005038598A (en) | Optical pickup | |
| JP2008305498A (en) | Optical pickup device | |
| JP2009271329A (en) | Wavelength plate and optical pickup using the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 14718479 Country of ref document: EP Kind code of ref document: A1 |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |
|
| 122 | Ep: pct application non-entry in european phase |
Ref document number: 14718479 Country of ref document: EP Kind code of ref document: A1 |