WO2014041676A1 - 光記録装置、光記録方法および光記録媒体 - Google Patents
光記録装置、光記録方法および光記録媒体 Download PDFInfo
- Publication number
- WO2014041676A1 WO2014041676A1 PCT/JP2012/073571 JP2012073571W WO2014041676A1 WO 2014041676 A1 WO2014041676 A1 WO 2014041676A1 JP 2012073571 W JP2012073571 W JP 2012073571W WO 2014041676 A1 WO2014041676 A1 WO 2014041676A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- recording
- power
- dots
- optical recording
- difference
- Prior art date
Links
Images
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
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
- G11B7/1267—Power calibration
-
- 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
- G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
- G11B2007/0009—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage
- G11B2007/0013—Recording, reproducing or erasing systems characterised by the structure or type of the carrier for carriers having data stored in three dimensions, e.g. volume storage for carriers having multiple discrete layers
Definitions
- the present invention relates to an apparatus and method for recording information on a medium using light, and an information recording medium.
- Patent Documents 1 and 2 and Non-Patent Document 1 describe a three-dimensional memory in which a recording mark having a refractive index different from that of the surrounding glass is locally formed on glass or the like.
- the mechanism by which local denaturation is formed by a short pulse laser is described in Non-Patent Document 2, for example.
- the recording power As the recommended value of the recording power, one recorded in advance on the recording medium may be read and used, or a step of adjusting the recording power before recording may be provided.
- the dot length can be easily measured by monitoring the dot from a direction orthogonal to the incident direction of the laser beam.
- the recording power can be adjusted so as to optimize the recording quality, as in (1) above.
- a device having means for measuring the recording dot length of (1) and means for adjusting power from the measurement result. Thereby, the apparatus which can perform optimal recording similarly to said (1) can be provided.
- a device having means for measuring the difference between the focus position where the recording dot area of (2) above appears brighter than the focus position, and the focus position where the recording dot area appears darker than the surroundings, and means for adjusting the power based on the measurement result.
- the power adjustment of the laser beam can be optimized, so that high recording quality can be ensured.
- the figure which showed the example of the apparatus structure used for the recording method of this invention The schematic diagram of the image which monitored the recording medium in which the dot was recorded inside with the camera. The figure which shows the relationship between dot length L and recording power.
- A An example of an image of a recording medium in which dots are recorded.
- B An example of an image on a recording medium monitored by changing the focus position of the camera.
- C The figure which showed the example of the focus position where a dot looks black, and the focus position where white appears.
- FIG. 5 is an example of a flowchart from the start of recording after adjusting the recording power and determining the interlayer distance according to the present invention.
- FIG. 5 The figure which shows the example of the recording medium with which the target value of the focus position difference D is recorded. The example of the flowchart which records with reference to the information recorded on the recording medium.
- FIG. 1 is a diagram showing an example of an apparatus configuration used in the recording method of the present invention.
- This apparatus includes a recording optical system, a reproducing optical system, and a controller 100 that controls the entire apparatus.
- the laser 101 emits laser light 102.
- Examples of the laser 101 include a short pulse laser that has a high peak power and can induce a nonlinear optical effect, such as a titanium sapphire laser, a Q-switched YAG laser, and a fiber laser.
- the shutter 103 and the attenuator 104 perform irradiation control and power control of the laser beam 102 to the recording medium 107.
- the shutter 103 and the attenuator 104 may be built in the laser 101, or a similar function may be realized by combining a phase modulator and a polarizing plate.
- the mirror 105 reflects the laser light 102 and transmits the reproduction light 109 described later.
- the lens 106 condenses the laser beam 102 on the recording medium 107 to perform dot recording.
- the recording medium 107 is a medium transparent to the laser beam 102 such as quartz glass.
- the stage 108 controls the position of the recording medium 107. By this position control, the condensing position of the laser beam 102 is changed, and a plurality of dots are recorded three-dimensionally based on the recording data.
- the recording medium 107 may be moved by a stage 108 using a piezo or a stepping motor, or the condensing position is controlled by a galvanometer mirror or a spatial phase modulator. Also good.
- the reproduction light source 110 emits reproduction light 109.
- Examples of the light source for reproduction include an LED and a semiconductor laser.
- the reproduction light 109 passes through the recording medium 107 and is condensed on the camera 111 and the camera 112.
- the camera 111 monitors the length of the dot in the depth direction by observation from a direction (y direction) orthogonal to the incident direction of the laser beam 102.
- the camera 112 can monitor the recorded dots and the surrounding brightness by observation from the incident direction (z direction) of the laser beam 102.
- the camera 111 and the camera 112 output the monitored image to the controller 100.
- the controller 100 measures the dot length, the dot, and the surrounding brightness from the input image.
- an error rate and S / N which will be described later, are calculated, signal processing and decoding are performed, and data is reproduced. Note that only one of the camera 111 and the camera 112 may be provided in accordance with measurement items such as dot length and brightness.
- FIG. 2 is a schematic diagram of an image obtained by monitoring the recording medium 107 in which dots are recorded with the camera 111.
- the dots 201 are formed on the xy plane according to the recording data, and a plurality of recording layers are virtually formed in the z direction.
- FIG. 3 shows a plot of the relationship with the recording power, where L is the length of the monitored dot.
- the dot length L has a correlation with the recording power, and increases as the recording power increases. This relationship also changes depending on the conditions of the laser 101 and the objective lens 106 and the type of recording medium. That is, even if the recording power is the same, the dot shape to be formed changes when the objective lens conditions are different.
- FIG. 4A shows an example of an image obtained by monitoring the recording medium 107 in which dots are recorded with the camera 112.
- the region where the laser beam 102 is condensed can be observed as dots 201, and digital data can be recorded and reproduced by making the presence or absence of the dots 201 correspond to 0 and 1 of the data.
- a quality evaluation index it is possible to calculate an error rate and S / N as follows. The error rate is calculated by providing a brightness threshold value, determining 0 and 1 of the data, and comparing with the original data.
- Equation 1 For S / N, the difference between the average brightness of the dot and the space 202 is used as the signal amplitude, and the value obtained by adding the standard deviation of the brightness of the dot and the space as RMS is calculated as the noise by the calculation of Equation 1.
- ⁇ d and ⁇ s represent brightness variations of dots and spaces, respectively, and V d and V s represent average brightness of dots and spaces, respectively.
- the root sign indicates an operation on ( ⁇ d 2 + ⁇ s 2 ), and
- an index obtained by normalizing the difference between the average brightness of the dot 201 and the space 202 by the average brightness of the space 202 is defined as a modulation degree M.
- FIG. 4B shows an example in which the focus position of the camera 112 is changed by 16 ⁇ m in the minus z direction with respect to FIG.
- the dots are dark (black) with respect to the surroundings, whereas in FIG. 4B, they are observed bright (white).
- FIG. 4C is a diagram showing an example of the focus position in FIGS. 4A and 4B.
- FIG. 5 is a diagram in which the relationship between the recording power and the focus position where the dots are observed darkest with respect to the surroundings and the focus position where the dots are observed brightest is plotted as D.
- the focus position difference D has a correlation with the recording power and increases as the recording power increases. This relationship also changes depending on the conditions of the laser 101 and the objective lens 106 and the type of recording medium. That is, the focus position difference D corresponds to the dot shape and brightness that are actually formed.
- the tendency of the focus position difference D with respect to the recording power is shown here, the same tendency is shown even when recording energy is used as a parameter.
- FIG. 6 is a diagram showing the relationship between the error rate and the focus position difference D.
- the error rate is 1 ⁇ 10 ⁇ 3 or less
- recording may be performed so that the focus position difference D is included in the range of 13 to 20 ⁇ m.
- the focus position difference D can be used for other indicators such as S / N described above.
- the dot length L or the modulation degree M may be used as a substitute for the focus position difference D. This is because the focus position difference D, the dot length L, and the modulation degree M are correlated, and the relationship with the recording quality shows the same tendency.
- FIG. 7 (a) is an example of a flowchart from the start of recording after adjusting the recording power according to the present invention.
- S701 the relationship between the recording quality and the focus position difference D or the dot length L shown in FIG. 6 is acquired.
- the target value Dtar of the focus position difference D is determined according to the recording quality specification. In the example of FIG. 6, the center 17 of the margin may be Dtar.
- step S703 recording is performed by changing the power.
- the focus position difference D of the dots recorded in step S703 is measured.
- FIG. 7B illustrates the operations from S703 to S705.
- the focus position difference D is measured at each recording power, and fitting is performed.
- the optimum recording power can be derived by obtaining the focus position difference D that becomes Dtar with respect to the fitting function.
- the number of dots for measuring the recording and focus position difference D at one recording power may be one, or a plurality of dots may be recorded and measured in order to improve measurement accuracy.
- the multilayer structure as shown in FIG. 2 has been described, but a single layer is also applicable. Even in the case of a single layer, it is possible to achieve a low error rate and high S / N by performing the above processing.
- FIG. 8 is a diagram showing an example of a method for quantifying interlayer crosstalk.
- an image 801 transmitted through the dots 201 of the recording layer is observed. This transmitted image becomes a factor of interlayer crosstalk in multilayering.
- ⁇ ct / Vsig normalized by the recording layer signal amplitude Vsig may be used as an index of interlayer crosstalk. By normalizing in this way, it is possible to cancel the recording condition dependency of the recording layer. Further, the error rate and S / N may be compared between the case where only one layer is recorded and the case where another layer is recorded, and the difference may be used as an index of interlayer crosstalk.
- FIG. 9 is a diagram showing the relationship between the interlayer crosstalk and the focus position difference D described above.
- Interlayer crosstalk has a correlation with the focus position difference D, and increases as the recording power increases. From FIG. 9, when the interlayer crosstalk is set to 3% or less, for example, recording may be performed so that the focus position difference D is 15 ⁇ m or less. That is, the recording power adjustment may be performed by setting Dtar to 15 or less.
- the dot length L or the modulation degree M may be used instead of the focus position difference D.
- FIG. 10 is an example of a flowchart for adjusting the recording power according to the present invention and starting recording.
- S1001 the relationship between the recording quality and the focus position difference D shown in FIG. 9 is acquired.
- the operations after S1003 are the same as those after S703 in FIG.
- FIG. 11 is a diagram showing the relationship between the focus position difference D and the error rate, and the relationship between the focus position difference D and the interlayer crosstalk when the interlayer distance is 60 ⁇ m and 30 ⁇ m.
- a method for determining the target value Dtar of the focus position difference D and the interlayer distance when the error rate specification is 1 ⁇ 10 ⁇ 3 or less and the interlayer crosstalk specification is 6% or less will be described.
- Dtar may be set to 13 to 15 so as to satisfy both the error rate and interlayer crosstalk specifications.
- the dot length L or the modulation degree M may be used instead of the focus position difference D.
- FIG. 12 is an example of a flowchart from the start of recording after adjusting the recording power and determining the interlayer distance according to the present invention.
- S1201 the relationship between the recording quality and interlayer crosstalk shown in FIG. 11 and the focus position difference D or dot length L is acquired.
- S1202 the focus position difference D and the interlayer distance that satisfy both the recording quality and the interlayer crosstalk specifications are determined according to the method described in the explanation of FIG. Since the operations from S1203 to S1205 are the same as the operations from S703 to S705 in FIG. Recording is performed based on the specifications of the optimum recording power and the determined interlayer distance in S1206.
- FIG. 13 is a diagram showing an example of a recording medium on which Dtar is recorded.
- a management area 1302 in which specifications of Dtar and interlayer distance are recorded is provided in an area different from the user data recording area 1301.
- the media manufacturer may record the recommended values of Dtar and interlayer distance, or the device that first recorded on the medium may record the specifications.
- the media manufacturer name, composition, date of manufacture, number of layers, dot interval, recommended recording power, laser wavelength, etc. may be recorded in the management area 1302, or the target value of the dot length L instead of Dtar.
- Ltar or target value Mtar of modulation degree M may be recorded.
- management area 1302 is provided outside the recording area 1301 in the recording area 1301. It may be provided at a specific position such as the top in the recording area 1301. Further, it may be provided for each recording layer or for each recording block. This is effective when the recording characteristics differ depending on the area in the recording medium.
- FIG. 14 is an example of a flowchart for recording with reference to information recorded on the recording medium shown in FIG.
- step S1401 the management information is moved to the management area 1302, and the management information is reproduced.
- step S1402 the specification of Dtar and interlayer distance is acquired from the management information.
- the operations after S1403 are the same as the operations after S1203 in FIG.
- the recording medium on which the target value Dtar of the focus position difference D is recorded has been described.
- the adjusted optimum recording power may be recorded in the management area. In this case, it is not possible to deal with variations in the apparatus, but the step of performing power adjustment can be omitted, so that there is an effect that information recording can be performed with simpler steps.
- the target value of either the recording dot length L or the focus position difference D is determined, and L or D is measured for each recording dot.
- a target value may be determined and L and D may be measured for each recording dot.
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Abstract
Description
Claims (13)
- 光記録媒体内部にレーザ光を集光することによって、周囲と屈折率が異なる複数の記録ドットを形成する記録方法であって、
前記記録ドットの深さ方向の記録ドット長さ、または/及び、前記記録ドットの領域が周囲より明るく見えるフォーカス位置と、周囲より暗く見えるフォーカス位置と差異に基づいて、調整された前記レーザ光のパワー値を取得するステップと、
前記取得されたパワー値にて情報記録を行うことを特徴とする光記録方法。 - 前記レーザ光のパワー値は、前記光記録媒体の所定領域に記録されており、
前記取得するステップは、前記記録されたパワー値を読み出すことにより行われることを特徴とする請求項1記載の光記録方法。 - 前記レーザ光のパワー値を取得するステップは、
前記記録ドット長さまたは/及び前記差異を計測するステップと、
前記計測した結果に基づいて、前記レーザ光のパワー値を調整するステップとにより、前記レーザ光のパワー値を取得することを特徴とする請求項1記載の光記録方法。 - 前記調整は、
記録品質を評価する指標と、前記記録ドット長さまたは/及び前記差異との関係を取得するステップと、
前記記録品質を評価する指標の所定の条件を満たすように、前記記録ドット長さまたは/及び前記差異の目標値を決定するステップと、
前記レーザ光のパワーを変化させて記録して、前記目標値に合う前記レーザ光のパワーを決定することによって、行われることを特徴とする請求項1記載の光記録方法。 - 前記光記録媒体は、複数の記録層を有し、
前記調整は、
層間クロストーク量と、前記記録ドット長さまたは/及び前記差異との関係を取得するステップと、
前記層間クロストーク量の所定の条件を満たすように、前記記録ドット長さまたは/及び前記差異の目標値を決定するステップと、
前記レーザ光のパワーを変化させて記録して、前記目標値に合う前記レーザ光のパワーを決定することによって、行われることを特徴とする請求項1記載の光記録方法。 - 前記光記録媒体は、複数の記録層を有し、
前記調整は、
記録品質を評価する指標および層間クロストーク量と、前記記録ドット長さまたは/及び前記差異との関係を取得するステップと、
前記層間クロストーク量の所定の条件および前記層間クロストーク量の所定の条件を満たすように、前記記録ドット長さまたは/及び前記差異の目標値を決定するステップと、
前記レーザ光のパワーを変化させて記録して、前記目標値に合う前記レーザ光のパワーを決定することによって、行われることを特徴とする請求項1記載の光記録方法。 - 更に、前記層間クロストーク量の所定の条件を満たすように、前記複数の記録層の層間距離を調整することを特徴とする請求項6記載の光記録方法。
- 前記層間クロストーク量は、前記記録層から所定の層間距離離れた未記録層における明るさのばらつきσct、前記記録層の信号振幅Vsigで正規化したσct/Vsig、一層記録時と複数層記録時の記録品質の差異の何れかであることを特徴とする請求項5記載の光記録方法。
- 前記決定された目標値は、前記光記録媒体の所定の領域に記録されており、
前記目標値を読み出して、前記目標値に合う前記レーザ光のパワーを決定することを特徴とする請求項4記載の光記録方法。 - 光照射によって、周囲と屈折率が異なる複数の記録ドットが形成された光記録媒体であって、
前記記録ドットによって、ユーザデータが記録されたユーザデータ領域と、
前記記録ドットの深さ方向の記録ドット長さの推奨値、または/及び、前記記録ドットの領域が周囲より明るく見えるフォーカス位置と、周囲より暗く見えるフォーカス位置と差異の推奨値が記録された管理領域とを有することを特徴とする光記録媒体。 - 前記管理領域には、前記記録層の層間距離も記録されていることを特徴とする請求項10記載の光記録媒体。
- レーザ光を出射する光源と、
前記レーザ光を光情報記録媒体に集光し、周囲と屈折率が異なる複数の記録ドットを記録する手段と、
前記レーザ光の入射方向に対し直交方向から前記記録ドットの深さ方向の長さをモニタする手段と、
前記モニタする手段によって取得した前記ドットの深さ方向の長さに基づいて、前記レーザ光の記録パワーを調整する手段とを有することを特徴とする光記録装置。 - レーザ光を出射する光源と、
前記レーザ光を光情報記録媒体に集光し、周囲と屈折率が異なる複数の記録ドットを記録する手段と、
前記記録ドットおよび周囲の領域の明るさをモニタする手段と、
前記モニタする手段によって前記記録ドットの領域が周囲より明るく見えるフォーカス位置と、暗く見えるフォーカス位置との差異を取得し、前記差異に基づいて、前記レーザ光のパワーを調整する手段とを有することを特徴とする光記録装置。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014535319A JP6035613B2 (ja) | 2012-09-14 | 2012-09-14 | 光記録装置、光記録方法および光記録媒体 |
US14/428,154 US9653108B2 (en) | 2012-09-14 | 2012-09-14 | Optical recording device, optical recording method, and optical recording medium |
PCT/JP2012/073571 WO2014041676A1 (ja) | 2012-09-14 | 2012-09-14 | 光記録装置、光記録方法および光記録媒体 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2012/073571 WO2014041676A1 (ja) | 2012-09-14 | 2012-09-14 | 光記録装置、光記録方法および光記録媒体 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2014041676A1 true WO2014041676A1 (ja) | 2014-03-20 |
Family
ID=50277829
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2012/073571 WO2014041676A1 (ja) | 2012-09-14 | 2012-09-14 | 光記録装置、光記録方法および光記録媒体 |
Country Status (3)
Country | Link |
---|---|
US (1) | US9653108B2 (ja) |
JP (1) | JP6035613B2 (ja) |
WO (1) | WO2014041676A1 (ja) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001283443A (ja) * | 2000-03-31 | 2001-10-12 | Sony Corp | 光記録媒体、光記録方法、光再生方法、および光記録再生装置 |
JP2007035237A (ja) * | 2005-06-22 | 2007-02-08 | Matsushita Electric Ind Co Ltd | 光ディスク記録制御方法および光ディスク記録制御装置 |
JP2008135144A (ja) * | 2006-10-23 | 2008-06-12 | Sony Corp | 光情報記録装置及び光情報記録方法並びに光情報再生装置及び光情報再生方法 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3474457A (en) * | 1967-11-13 | 1969-10-21 | Precision Instr Co | Laser recording apparatus |
JP2961126B2 (ja) | 1995-02-13 | 1999-10-12 | セントラル硝子株式会社 | 三次元光メモリーガラス素子からなる記録媒体及びその記録方法 |
US5793723A (en) * | 1995-06-14 | 1998-08-11 | Nikon Corporation | Method and a system for adjusting optical recording device involving an optical recording medium of non-uniform heat characteristics |
US5761111A (en) | 1996-03-15 | 1998-06-02 | President And Fellows Of Harvard College | Method and apparatus providing 2-D/3-D optical information storage and retrieval in transparent materials |
KR20080091830A (ko) * | 2006-02-20 | 2008-10-14 | 가부시키가이샤 리코 | 최적 레이저 빔 파워를 결정하는 방법 및 광 기록 매체 |
US7960092B2 (en) | 2006-10-23 | 2011-06-14 | Sony Corporation | Method of recording in an optical information recording medium |
WO2010103770A1 (ja) * | 2009-03-09 | 2010-09-16 | パナソニック株式会社 | 情報記録媒体、情報記録媒体への情報の記録方法、情報記録媒体からの情報の再生方法および情報記録媒体の製造方法 |
-
2012
- 2012-09-14 US US14/428,154 patent/US9653108B2/en not_active Expired - Fee Related
- 2012-09-14 JP JP2014535319A patent/JP6035613B2/ja not_active Expired - Fee Related
- 2012-09-14 WO PCT/JP2012/073571 patent/WO2014041676A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001283443A (ja) * | 2000-03-31 | 2001-10-12 | Sony Corp | 光記録媒体、光記録方法、光再生方法、および光記録再生装置 |
JP2007035237A (ja) * | 2005-06-22 | 2007-02-08 | Matsushita Electric Ind Co Ltd | 光ディスク記録制御方法および光ディスク記録制御装置 |
JP2008135144A (ja) * | 2006-10-23 | 2008-06-12 | Sony Corp | 光情報記録装置及び光情報記録方法並びに光情報再生装置及び光情報再生方法 |
Non-Patent Citations (2)
Title |
---|
HIROAKI MISAWA: "Takoshi Kyushu ni yoru Glass Hikari Memory", 0 PLUS E, September 1998 (1998-09-01), pages 1028 - 1032 * |
KABUSHIKI KAISHA SANGYO GIJUTSU SERVICE CENTER, HIKARI OYO GIJUTSU.ZAIRYO JITEN, 26 April 2006 (2006-04-26), pages 563 - 566 * |
Also Published As
Publication number | Publication date |
---|---|
US20150255106A1 (en) | 2015-09-10 |
JP6035613B2 (ja) | 2016-11-30 |
JPWO2014041676A1 (ja) | 2016-08-12 |
US9653108B2 (en) | 2017-05-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US10324285B2 (en) | Aberration-correction method, laser processing method using said aberration-correcting method, laser irradiation method using said aberration-correcting method, aberration-correcting device and aberration-correcting program | |
US7488955B2 (en) | Multiphoton-excitation observation apparatus | |
JP6014168B2 (ja) | 光記録装置及び光記録方法 | |
JP2011180290A (ja) | 収差補正方法、この収差補正方法を用いた顕微鏡観察方法、この収差補正方法を用いたレーザ照射方法、収差補正装置、及び、収差補正プログラム | |
US9977229B2 (en) | Inner layer measurement method and inner layer measurement device | |
JP4992083B2 (ja) | 屈折率測定方法および屈折率測定装置、光学部材の製造方法 | |
JP6035613B2 (ja) | 光記録装置、光記録方法および光記録媒体 | |
JP4580450B1 (ja) | 記録パワー調整方法、情報記録方法及び評価方法 | |
JP2003242644A5 (ja) | ||
US8116186B2 (en) | Collinear holographic storage method and apparatus | |
JP2008165874A (ja) | 磁界分布測定装置、温度分布測定装置、磁界分布測定方法及び温度分布測定方法 | |
JP2003242643A5 (ja) | ||
JP2004335060A (ja) | 光記録媒体および光記録再生装置 | |
JP5051699B2 (ja) | レーザ顕微鏡 | |
KR20090028981A (ko) | 온도 측정 장치 및 온도 측정 방법 | |
TWI359279B (en) | Auto-focusing measuring device | |
RU2414011C1 (ru) | Устройство для записи-стирания-считывания информации в многослойном оптическом диске | |
JP4580463B1 (ja) | 評価方法 | |
JP4498056B2 (ja) | 光情報記録媒体及び光情報記録再生方法 | |
JP4779694B2 (ja) | ホログラム記録媒体の評価装置及びホログラム記録媒体の評価方法 | |
JP6030180B2 (ja) | 収差補正方法、この収差補正方法を用いた顕微鏡観察方法、この収差補正方法を用いたレーザ照射方法、収差補正装置、及び、収差補正プログラム | |
RU99232U1 (ru) | Устройство для записи-стирания-считывания информации | |
JP2013506228A (ja) | 多層光ディスクに対しデータを記録し、読み出すための装置 | |
JP3784689B2 (ja) | 光磁気記録媒体再生方法及び光磁気記録媒体再生装置 | |
JP5397108B2 (ja) | 多層光記録媒体、光記録媒体ドライブ装置及びフォーカス引き込み方法 |
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: 12884559 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2014535319 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 14428154 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 12884559 Country of ref document: EP Kind code of ref document: A1 |