WO2004047096A1 - 光ディスク製造用原盤の作製方法及び光ディスクの製造方法 - Google Patents
光ディスク製造用原盤の作製方法及び光ディスクの製造方法 Download PDFInfo
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- WO2004047096A1 WO2004047096A1 PCT/JP2003/014848 JP0314848W WO2004047096A1 WO 2004047096 A1 WO2004047096 A1 WO 2004047096A1 JP 0314848 W JP0314848 W JP 0314848W WO 2004047096 A1 WO2004047096 A1 WO 2004047096A1
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- exposure
- resist layer
- recording
- master
- laser beam
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- 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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
- G11B7/261—Preparing a master, e.g. exposing photoresist, electroforming
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- 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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
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- 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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
Definitions
- the present invention relates to a method of manufacturing a master for manufacturing an optical disk and a method of manufacturing an optical disk.
- the present invention relates to an optical disk substrate having a concave pattern such as a group for tracking, an address, or the like for data recording and a pit for data recording, for example, by injection molding, 2 mm (PhotoPolymerization).
- the present invention relates to a method for producing a master for producing an optical disk and a method for producing an optical disk for transferring and producing a stannoid 0 formed by the method.
- optical disks such as DVD (DigitalVersatti1eDisc) have been used in a wide range of fields as recording media.
- This optical disk is composed of a group for obtaining various information signals such as an address signal and a tracking signal on an optically transparent optical disk substrate such as a polycarbonate, and a pick as a recording section of a data information signal.
- a fine information uneven pattern such as a metal film is formed, a reflective film made of a metal thin film such as aluminum is formed thereon, and a protective film is further formed on the reflective film.
- This optical disk is manufactured through manufacturing steps as shown in FIGS. 13 to 13 (for example, Japanese Patent Application Laid-Open No. 2001-195719, paragraphs [0000] to [002]. 0 0 0 6]).
- a glass substrate 90 is prepared (FIG. 13A), and a resist layer 9 made of a photosensitive photo resist (organic resist) is placed on the glass substrate 90 having a sufficiently smooth surface. 1 is formed uniformly to form a resist substrate 92 (FIG. 13B).
- the recording laser beam is caused to relatively spirally run on the resist layer 91 of the resist substrate 92 from the peripheral portion to the outer peripheral portion or from the outer peripheral portion to the inner peripheral portion of the substrate 90.
- an exposure master that irradiates a recording laser beam whose on / off control is performed in accordance with the information signal pattern and exposes the resist layer 91 to pattern exposure corresponding to the information unevenness pattern of the optical disk substrate to be finally obtained, that is, an exposure master.
- This forms 93 (Fig. 13C).
- a metal nickel metal layer 95 is formed on the concave / convex pattern surface of the master disc 94 by a method (FIG. 13E).
- the paint layer 95 of the master 94 is peeled off from the master 94 and subjected to a predetermined processing to obtain a molding stand 96 to which the concave / convex pattern of the master 94 has been transferred (FIG. 13F).
- a resin optical disc substrate 97 made of thermoplastic resin is formed by injection molding (Fig. 13G, H).
- An optical disk 200 is obtained by forming 98 (Fig. 13I) and the protective film 99 (Fig. 13J).
- optical disc manufactured in this way is
- the asymmetry indicates the asymmetry of the amplitude of the reproduced signal when the signal is reproduced, is an index of the quality of the reproduced signal of the optical disk, and is also an important item which is also used as a criterion for evaluating a player or an optical pickup. Furthermore, since the asymmetry is affected by the dimensional fluctuations of the recesses (pits) of the concavo-convex pattern formed on the optical disc, the situation in which the concavo-convex pattern is miniaturized with the recent increase in the capacity of optical discs. Has become a more important management item I have.
- the master disk manufacturing process in the manufacture of optical discs is a process that has a significant effect on pit formation, and strict management is required.
- asymmetry y measurement results found after the final process are feed-knocked during the manufacturing process, so that manufacturing conditions cannot be quickly corrected.
- the exposure conditions modified based on the feed and knock information from the last step of the lot from the time when the product passes through the exposure port It took a lot of time before the was reflected.
- a defect caused by the manufacturing conditions in the exposure process it takes time to determine the cause of the defect. Therefore, it is necessary to increase the time to reflect the correction of the conditions. However, it also hindered overall productivity.
- the resist layer is exposed under a constant exposure condition based on a recording pattern of an exposure apparatus set corresponding to a resist material constituting the resist layer on the resist substrate. For this reason, when the recording sensitivity of the resist layer fluctuates on the resist substrate, the fluctuation in the sensitivity directly affects the quality of the recorded signal. Also, it was difficult to cope with the variation in recording sensitivity between the openings of the resist substrate.
- the present invention has been made in view of the above-described problems in the related art, and in an exposure process for manufacturing a master for manufacturing an optical disc, immediately after exposing a resist layer, an optical disc is obtained from a recording signal characteristic of the exposed portion. Prediction and evaluation of the recording signal characteristics (asymmetry) of the recording device.
- the present inventors have proposed that when an optical resist is produced using an inorganic resist that causes a chemical change in state by exposure, the inorganic resist produced by the exposure Using the phenomenon that the light reflectance (reflected light amount) changes in response to the chemical state change of the material, and the reflectance, modulation degree, and asymmetry determined from the recording signal characteristics of the inorganic resist layer. Focusing on the fact that the correlation between the reflectance and the modulation factor and the asymmetry of the optical disk finally obtained correspond to each other.
- the method of manufacturing a master for manufacturing an optical disc according to the present invention is directed to a method for recording information modulated on an inorganic resist layer formed on a substrate by an information signal corresponding to an information signal of an information uneven pattern formed on the optical disc. Irradiating a laser beam for An exposure step of forming an exposure pattern corresponding to the pattern; and thereafter, a development process is performed on the inorganic resist layer to form a concavo-convex pattern corresponding to the information concavo-convex pattern zero turn by the inorganic resist layer.
- a recording signal characteristic of the exposure pattern by the recording layer is evaluated, and the power of the recording laser beam is controlled based on the evaluation result.
- the present invention is characterized in that, in the above-mentioned work of the master for optical disc production :: method, a resist layer containing incomplete: transition metal of the transition metal is used as the inorganic resist.
- the present invention provides the above-mentioned method for producing a master for optical disk production, wherein the predetermined area to be irradiated with the laser light for evaluation is an area other than the irradiation area of the laser light for recording in the inorganic register. It is characterized by
- the present invention also relates to the above-described method for producing a master for manufacturing an optical disc.
- the laser light for IU self-evaluation is irradiated near the irradiation position of the recording laser light.
- the present invention also provides the method for producing a master for manufacturing an optical disk described above, wherein the laser light for evaluation, which is irradiated while irradiating the laser light for recording, is provided in the vicinity of the irradiation position of the laser light for writing. Irradiating the unexposed area and the exposed area of the recording laser light, and the inorganic laser is determined by the ratio of the amount of reflected laser light from the unexposed area to the amount of reflected light from the exposed area. The recording signal characteristic of the exposure pattern by a resist layer is evaluated.
- the laser beam for recording is controlled so that the ratio of the amount of reflected light is constant.
- One control is performed.
- the method of manufacturing an optical disc according to the present invention includes the steps of: manufacturing a master disc for manufacturing an optical disc; a stamper manufacturing step of transferring and manufacturing a stamper for manufacturing an optical disc from the master disc; A step of transferring and manufacturing an optical disk substrate; a step of forming a reflective film on the optical disk substrate; and a step of forming a protective film on the optical disk substrate.
- the inorganic resist layer is irradiated with a recording laser beam modulated by an information signal corresponding to an information signal of an information uneven pattern formed on the optical disc, and an exposure corresponding to the information uneven pattern of the optical disc is performed.
- An exposure step for forming a pattern, and then, a development process is performed on the inorganic resist layer to obtain an IJ information pattern with the mechanical resist layer. And forming a corresponding concave-convex pattern Ichin, the exposure
- a predetermined area of the machine resist layer is irradiated with a laser beam for evaluation, and the reflected light of the laser beam for evaluation is used to check the inorganic resist layer for The characteristics of the tfb signal of the self-exposure pattern are evaluated, and based on the results of the evaluation, the laser light pattern control for the self-exposure fee is performed.
- the inorganic resist layer is a resist layer containing an incomplete oxide of a transition metal.
- an inorganic resist layer having a different reflectance between an exposed portion and an unexposed portion is used.
- the exposure state can be evaluated by irradiating the evaluation laser beam. Based on this evaluation, the exposure layer is set or the exposure layer is controlled to change the exposure layer, and the exposure of the resist layer is performed.
- the information required by the information unevenness pattern on the optical disc that is finally obtained specifically, for example, DVD-ROM In this way, it is possible to obtain an asymmetry in the required value range of 15 to 15%.
- the test exposure before the exposure processing is performed on the basis of the above-described information signal at the stage of the exposure process for producing the master, so that the reflected light of the evaluation laser light from now on
- the recording signal characteristics of the exposure pattern are evaluated to determine the quality of the final product under the exposure conditions, and the result is used to immediately determine the recording power of the exposure apparatus for the exposure scheduled area for recording. Becomes possible.
- the evaluation of the recording signal characteristics of the exposure pattern is to evaluate whether or not the recording signal characteristics of the exposure master, that is, the reflectance ratio, the modulation degree, and the asymmetry are within a predetermined range.
- the recording signal characteristic of the optical take of the final product can be determined.
- this is the relationship between the above-described recording signal characteristics of the register layer and the recording signal characteristics of the optical disk, specifically, the relationship between the reflectance ratio or modulation degree of the optical disk and the asymmetry.
- the clerks have a corresponding relationship with each other.
- the evaluation laser beam is a laser beam of such a degree that the resist layer is not exposed to light
- this evaluation laser beam is, for example, a laser beam for recording, for example.
- a laser beam obtained by switching the puff using a semiconductor laser can be used.However, when the evaluation laser beam and the exposure or recording laser beam are used at the same time, different semiconductor lasers are used.
- one laser beam may be split by a grating hologram or the like, and the 0th-order light may be used as a recording or laser beam, and ⁇ 1st-order light may be used as an evaluation laser beam. Can be.
- the definitions of the reflectance ratio of the resist layer that is, the normalized reflected light amount ratio
- the modulation degree and the asymmetry are based on the same definitions as in the optical disk.
- Figure 1 about this A description will be given with reference to FIG.
- Fig. 1 OA curve 400 represents the reproduction signal waveform obtained by detecting the amount of reflected light by irradiating the evaluation laser beam on the pit (mark) row shown in Fig. 1 OB in the 17 PP modulation method with the optical pickup device. Is shown. As shown in FIG. 10A, I M , I 8 H , 18 I 2 H , and I 2 L are unexposed, 8 T space, 8 T pit, 2 T space, It is the 2 T-pit reproduction output, that is, the reflected light amount (return light amount).
- the reflectance ratio is defined as the ratio I s / I M of the average I s of the total amount of return light to all the pits and spaces and the return light I M to the unexposed part.
- the exposed parts are of various lengths
- the eye pattern shown in Fig. 11 can be obtained from the photodetector force during playback.
- the modulation method is 17PP, so the longest space mark is 8T and the shortest space or mark is 2T.o Brief description of the drawing
- FIG. 1A to FIG. 1J are process charts of manufacturing an optical disk manufacturing master according to the present invention and manufacturing an optical disk.
- FIG. 2 is a view schematically showing an exposure apparatus used in a resist layer exposure process to which the present invention is applied.
- FIG. 3 is a diagram showing the relationship between the recording pattern at the time of exposure and the reflectance ratio before and after exposure in the method for producing an optical disk production master and the method for producing an optical disk according to the present invention.
- FIG. 4 shows the reflectivity ratio of the exposure master and the optical disk in the method of manufacturing the master for optical disk manufacture and the method of manufacturing the optical disk according to the present invention.
- FIG. 5 is a diagram showing a relationship between a recording signal and an asymmetry.
- FIG. 5 is a diagram showing an exposure state of an embodiment of the method of the present invention.
- Fig. 6 is a graph showing the relationship between the recording power at the time of light and the reflectance ratio before and after exposure on a resist h substrate having different recording sensitivities on the inner and outer circumferences.
- FIG. 7 is a diagram showing the relationship between the reflectance ratio of the exposure master and the asymmetry of the recording signal of the optical disk when using resist substrates having different recording sensitivities on the inner and outer circumferences.
- FIG. 8 is a view showing an exposure mode according to another embodiment of the method of the present invention.
- FIG. 9 is a diagram showing a measurement result of the asymmetry in the radial direction of the optical disk when the method of the present invention is applied.
- FIG. 10 is a diagram showing a relationship between a row of pictures of an exposure pattern on an exposure master and a 'reproduced signal (reflected light)' based on the exposure pattern used for explaining the present invention
- FIG. 11 is a waveform diagram of a reproduction signal based on an exposure pattern on an exposure master used for describing the present invention.
- FIG. 12A to FIG. 12C are diagrams showing exposure signal pulses for the resist substrate, respectively.
- FIGS. 13A to 13J are manufacturing process diagrams of a conventional optical disk. BEST MODE FOR CARRYING OUT THE INVENTION
- Embodiments of a method for manufacturing an optical disk manufacturing master and an optical disk manufacturing method according to the present invention will be described by way of example.
- a resist layer 101 made of a predetermined inorganic resist material is prepared on a substrate 100 constituting an original master by a sputtering method (FIG. 1A). This substrate 100 is uniformly formed into a film to obtain a resist substrate 102 (FIG. 1B).
- the resist material of the resist layer 101 contains an incomplete oxide of a transition metal, and the incomplete oxide has a stoichiometric amount corresponding to the valence of oxygen of the transition metal. It consists of a resist material that is less than the stoichiometric oxygen content.
- a predetermined intermediate layer 110 may be formed between the substrate 100 and the resist layer 101 in order to improve the recording sensitivity of the resist layer 101.
- the thickness of the resist layer 101 can be determined at will by HX, the thickness is preferably in the range of 10 nm to 120 ⁇ m.
- a recording layer that is on-off modulated by an information signal centered on an information concave and convex pattern on the target optical disc in the resist layer 101 is used.
- An exposure master is manufactured by performing an exposure step by selective exposure using single light (Fig. 1c). At this time, the incomplete oxide of the transition metal constituting the resist material of the resist layer 101 absorbs ultraviolet light or visible light, and the chemical oxide is exposed to the ultraviolet light or visible light when irradiated. The properties change.
- a master 104 on which a predetermined uneven pattern is formed is obtained (FIG. 1D).
- a so-called selectivity is obtained, which is a difference in the etching rate between an exposed portion and an unexposed portion with respect to an acid or alkali aqueous solution even though it is an inorganic resist. .
- a metal plating layer 105 is formed on the uneven pattern surface of the master 104 by an electrodeposition method (FIG. 1E).
- the plating layer 105 is peeled off from the master 104 and subjected to a predetermined processing, and the unevenness of the master 104 is obtained.
- a mold stamper 106 onto which the pattern has been transferred is obtained (FIG. 1F).
- an optical disc substrate 107 made of a thermoplastic polycarbonate resin is molded by injection molding (FIGS. 1G and 1H).
- a reflective film 108 (FIG. II) and a protective film 109 made of, for example, an A1 alloy are formed on the uneven surface of the optical disk substrate 107 to obtain an optical disk 300 (see FIG. 1 J).
- the resist material applied to the resist layer 102 is an incomplete oxide of a transition metal.
- the incomplete oxide of the transition metal is a compound that is shifted in a direction in which the oxygen content is smaller than the stoichiometric composition corresponding to the valence of the transition metal, that is, the incomplete oxide of the transition metal. It is defined as a compound in which the content of oxygen in the oxide is smaller than the oxygen content of the stoichiometric composition corresponding to the valence of the transition metal.
- the resist layer 102 made of this material can absorb the ultraviolet or visible light energy that is transmitted in the state of the complete oxide of the transition metal. This makes it possible to record a signal pattern using the change in the chemical state of the material.
- transition metals that constitute the resist material include Ti, V, Cr, Mn, Fe, Nb, Cu, Ni, Co, Mo, Ta, W,
- a data measurement resist substrate similar to the above-described resist substrate 102 is prepared in advance prior to the above-described master disk exposure step, and exposure is performed on the resist substrate.
- the recording signal characteristics the above-described reflectance ratio, modulation degree, and asymmetry At least one of the measured data with the tri is obtained and placed.
- an example of exposure based on the 17PP recording signal is used.
- an exposure pattern is formed on a plurality of concentric circles by changing the power of the recording laser light. .
- the exposure pattern with these recording powers changed is irradiated with a laser beam for evaluation, the reflected light (return light) is detected, and a reflectance ratio is obtained, for example, and the reflectance ratio versus the recording power shown in FIG. 3 is obtained.
- an optical disk for data measurement is manufactured through the same steps as in FIGS. ID to J using the data measurement resist substrate used for this measurement.
- the information signal of the information uneven pattern formed on the optical disk for data measurement is reproduced to measure the asymmetry.
- the exposure in the exposure step of FIG. 1C in the manufacturing process of the optical disc manufacturing master that is, the power control of the recording laser beam is performed.
- the data of the relationship between the reflectance ratio and the recording power as in Fig. 3 is obtained for each production master, and the reflectance ratio according to the asymmetry obtained for the optical disc is obtained from the data in Fig. 4 obtained earlier.
- the recording power by the laser beam is obtained, and the exposure is performed under the control of the recording power.
- a test exposure for changing the power of the recording laser beam with respect to the invalid area for example, the outer periphery of the area outside the area used for forming the studs.
- the characteristics reflectance ratio, change, and asymmetry
- an exposure pattern that could obtain the required asymmetry of the optical disk finally obtained was obtained. That is, the exposure processing of all the self-wiping areas is performed according to the required laser light for recording.
- this correction is effective because the state of the exposure apparatus and the state of the substrate may cause fluctuations in manufacturing conditions. Further, in this method, an approximate recording signal characteristic is generally obtained in a region near the resist substrate 102, so that the correction is effectively performed.
- the evaluation laser beam spot has an elliptical spot whose major axis is in the radial direction of the resist substrate.
- the ratio of the reflected light amount of the evaluation laser light becomes constant.
- This method is effective especially when the recording sensitivity of the resist substrate is inevitably changed in the radial direction due to a change in the thickness of the resist layer, etc. Can be modified.
- the recording laser beam is irradiated onto the resist layer 101 of the resist substrate 102 while irradiating the light.
- a predetermined area near the irradiation position is irradiated with a laser beam for evaluation, and the amount of reflected light when the laser beam for evaluation is radiated is used to determine the relationship between the reflectance ratio and the asymmetry obtained in advance as described above. It is possible to predict and evaluate the recording signal characteristics of an optical disc.
- This apparatus is provided with a beam generating source 11 for generating, for example, a laser beam for exposing the resist layer, and the laser beam is supplied to the collimator lens 12, the grating 19, and the beam source. It has a configuration in which the resist layer of the resist substrate 15 on which the resist layer is formed by the objective lens 14 is focused and irradiated with the light through the printer 13. Further, this exposure apparatus has a configuration in which the reflected light from the resist substrate 15 is connected on a split photodetector 18 via a beam splitter 13 and a condenser lens 17.
- the split photodetector 18 detects the reflected light from the resist substrate 15, generates a focus error signal obtained from the detection result, and sends it to a focus actuator (not shown). Focus actuator This is to control the position of the objective lens 14 in the height direction.
- the turntable 16 is provided with a feed mechanism (not shown) so that the exposure position of the resist substrate 15 can be changed with high accuracy.
- exposure is performed while controlling the laser beam source 11 by a laser drive circuit (not shown) based on the information signal and the reflected light amount signal.
- a spindle motor control system is provided on the center axis of the turntable 16 to determine the optimum number of spindle rotations fe by BX based on the radial position of the optical system and the desired linear velocity. Controls the spindle motor.
- the resist substrate 15 is
- the turntable 16 is turned on.
- the resist layer is spirally or concentrically formed on the main surface of the resist substrate 15 from the inner peripheral portion to the outer peripheral portion or from the outer peripheral portion to the inner peripheral portion.
- the signal pattern is recorded. Specifically, when the light intensity of the beam spot focused on the resist substrate 15 is higher than a certain level, a chemical state change occurs in the inorganic resist material on the resist substrate 15 and the recording mark is formed. Therefore, in actual exposure, the signal intensity is changed by changing the amount of light emitted from the beam source 11 in accordance with the recording signal pattern to create the pattern of the recording marks on the resist layer. Is recorded.
- the method for manufacturing a master for manufacturing an optical disk according to the present invention is a method performed at the stage of the exposing step shown in FIG. 1C. Rate By utilizing the difference, it is possible to take out the signal from the exposure master and evaluate it in the same way as taking out the signal from the optical disc by the optical pickup. The details will be described below.
- the exposure master refers to a resist substrate after exposure and before development.
- the resist substrate 15 before exposure was set on the turntable 16 of the exposure apparatus of FIG. 2 so that the resist film-forming surface was arranged on the upper side. Irradiate the evaluation laser beam in this state (S1).
- the resist plate 15 irradiating a laser beam lower than the laser beam at the time of exposure O, the resist substrate 1 mounted on the turntable 16 5 is moved in the radial direction together with the touch table 16 while rotating the resist substrate 1.
- the laser beam 5 is a spiral or
- the laser beam is irradiated while being run relatively.
- the laser beam intensity at this time may be about one thirtieth of that at the time of exposure.
- the laser beam irradiated in step S1 is reflected by the resist layer, and is detected by the photodetector 18 via the beam splitter 13 and the condenser lens 17 of the exposure apparatus ( s 2). Since the low-frequency component of the signal detected by the photodetector 18 has a correlation with the reflectivity of the resist layer, the amount of reflected light of the resist layer before exposure is selected from the detected signals (see FIG. 10A). Know the radial fluctuation of I M ) (S 3). Next, by irradiating a laser beam having a predetermined recording power, the resist layer is exposed based on an exposure control method described later, and a recording signal, for example, a recording signal corresponding to a 17PP modulation method is exposed (S4). ).
- step S1 the chemical properties of the incomplete oxide of the transition metal, which is the resist layer, have changed in the region irradiated with the recording laser beam. Subsequently, under the same conditions as in step S1, a spiral or concentric signal recording section recorded on the register layer of the resist substrate 15 is formed.
- the laser beam is irradiated while being relatively scanned along (pit rows, groups, etc.) (S5).
- step S2 the laser light emitted in step S5 is reflected by the resist layer, and the reflected light is passed through the beam splitter 13 of the exposure apparatus and the condensing lens 17 to the photodetector. Detect by 1 8
- the fluctuation state in the radial direction of the reflected light amount ( ⁇ 8 ⁇ , 18 I 2 H , I 2 L ) of the lent layer is extracted (S 7).
- the radial fluctuation state of the reflectance ratio at each position is determined.
- This reflectivity ratio is the ratio of the reflectivity before and after exposure with reference to the reflectivity of the resist layer at the detection point of the exposure master before exposure, and is based on the substrate conditions (substrate type, intermediate layer type and thickness) It is determined by the resist conditions (inorganic resist type, thickness, etc.) and the exposure conditions (light wavelength, recording power, etc.).
- the optical disk is finally manufactured from the radial fluctuation state of the reflectance ratio obtained in step S8.
- the radial fluctuation state of the asymmetry of the optical disc to be read (Fig. 7) is analogized, and the signal is evaluated as an exposure master to confirm the quality (S9).
- the symmetry is, for example, +5 to 11 over the entire recording area of the optical disk to be finally manufactured.
- a non-defective product is judged based on whether it is within the range of 0%.
- Step S8 and step S9 will be described in more detail.
- An example of the relationship between the recording power during exposure and the reflectance ratio before and after exposure is shown.
- Figure 3 shows.
- silicon was used as the substrate, and an incomplete oxide of trivalent W and trivalent Mo was used as the resist material, and exposed with a laser beam having a wavelength of 405 nm according to the above evaluation method.
- a master was actually manufactured, and recording and evaluation were performed under the same and constant beam spot diameter of the recording laser beam and the evaluation laser beam.
- the reflectance ratio tended to decrease as the recording power of the recording laser beam increased.
- the reflectivity decreases due to the chemical state change of the inorganic resist material after exposure, but as the recording puff increases, the area where the reflectivity decreases (the mark recorded in HD on the resist layer) increases. Because it becomes. Therefore, it is not always necessary that the reflectance ratio is small. If the reflectance ratio is too small, the concave portion (or convex portion) of the optical disk becomes too wide and the signal standard such as the asymmetry of the recording signal of the optical disk is required. Therefore, the reflectance ratio must be within a certain range to satisfy the signal standard.
- Fig. 4 shows a reference example.
- Fig. 4 shows the results of using the exposure master produced in Fig. 3 to fabricate an optical disc according to the manufacturing process shown in Figs. In Fig. 4, there is a difference between the reflectance ratio and the asymmetry.
- a one-to-one correspondence is observed, e.g., a reflectance ratio of 0.920 to 0.90.
- the asymmetry or the modulation degree of the recording signal of the exposure master from the high frequency component of the signal detected by the photodetector 18 in step S7.
- a change in the reflectance of the exposed portion causes a difference in the reflectance in the area with and without the exposure, and when the evaluation laser light is irradiated there, the RF phenomenon occurs due to the diffraction phenomenon caused by the difference.
- a signal pattern is obtained, and the asymmetry modulation degree can be obtained from the RF signal pattern.
- the exposure evaluation method of the present invention it is possible to predict and evaluate the signal quality of an optical disc produced by the exposure master in the resist layer exposure step.
- step S4 in the above-described method for manufacturing a master for optical disk manufacturing will be described in detail.o
- the recording signal characteristics of the exposure pattern of the resist substrate are evaluated using the above-described exposure evaluation method, and based on the evaluation result, the resist base is evaluated.
- the purpose is to adjust the recording power of the recording light to the plate. The details are described below.
- test exposure is performed on the part of the main surface of the resist substrate that is not the recording area of the optical disk, such as the inner and outer peripheral parts (the part that is not used as a disk standard).
- the reflectance ratio before and after the exposure of the exposed part is measured, and the asymmetry and the degree of modulation are measured.
- the target value of the asymmetry of the recording signal of the optical disc for example,
- Reflection is obtained from the relationship between the reflectance ratio (or the asymmetry or modulation factor of the exposure master) and the asymmetry of the recording signal of the optical disc as shown in Fig. 4 which was obtained in advance. Determine the ratio (or asymmetry or tonality of the exposure master) (S12;).
- the “laser light for recording” obtained in step S11 is obtained.
- the recording power of the recording laser beam is determined from the relationship between the “recording power” and the reflectivity ratio (or the asymmetry y modulation degree of the exposure master) J (S13).
- the resist layer exposing step is performed under the condition of the recording power obtained in step S13 (S14).
- this method can accurately set the asymmetry of the recording signal of the optical disk within the standard range.
- a signal near an exposed portion is evaluated in the process of running the laser beam for recording, and based on the evaluation result, a feed and a knock are immediately supplied to a recording laser beam recording layer. Click to make adjustments.
- FIG. 5 shows an embodiment of the exposure control method of the present invention in the exposure apparatus of FIG. 2, and the resist substrate is exposed at the stage of the resist layer exposure step.
- the figure shows a state in which the surface of the distant layer is irradiated with three laser beams and scanned in the pit row direction.
- Exposure control as described below is performed according to this mode.
- the target value of the asymmetry of the optical disc recording signal (for example,
- the reflectance ratio R can be obtained from the relationship between the reflectance ratio and the asymmetry of the recording signal of the optical disk as shown in Fig. 4 (S2 1) o
- the recording power obtained from the relationship between the recording light recording puff and the reflectance ratio as shown in Fig. 3 prepared so as to have the reflectance ratio R is shown.
- the recording light of is illuminated on the spot A ⁇ o
- the spot B is located ahead of the recording spot A in the actual beam traveling direction, and measures the amount of reflected light from the resist layer before exposure (S22).
- Spot C is located after recording spot A in the actual beam scanning direction, and measures the amount of reflected light from the resist layer after exposure (S23).
- the reflected light from each spot is detected and measured by the divided photodetector 18 via the beam splitter 13 and the condenser lens 17 in FIG.
- the ratio of the reflected light amounts that is, (reflected light amount of spot C) / (reflected light amount of spot B) is determined (S24).
- This reflected light The quantitative ratio corresponds to the reflectance ratio described in the above-mentioned 3t evaluation method.
- the reflectance ratio R obtained in step S21 is compared with the reflection light amount ratio obtained in step S24, and it is confirmed whether they match (S25).
- the laser beam is irradiated under the condition of the recording power.
- step 3 it is determined from the relationship between the recording laser beam recording power and the reflected light amount ratio (reflectance ratio), and the recording power condition is modified to the spot A laser beam condition, and exposure is performed. (S28).
- steps S22 to S28 is performed in a very short time (s order), and the surface of the resist layer of the resist substrate is irradiated with three laser beams to perform a pick-up operation. This is performed continuously in the process of scanning in the direction of row G.
- the above exposure control method it is possible to control the recording power of the recording laser beam so that the reflected light amount ratio is always constant, and, consequently, the recording signal of the optical disk produced by the exposure master.
- the asymmetry can be constant.
- this exposure control method even if there is a recording sensitivity difference between the inner circumference and the outer circumference of the resist substrate as shown in FIG. The relationship between "" and "optical disk asymmetry" is maintained in the same manner as in Fig. 4, so that by using the above exposure control method, a stable signal quality can be obtained over the entire optical disk. is there.
- FIG. 8 the laser beam from one beam source 11 is divided into three beams and applied to the surface of the resist layer by utilizing the grating 19 of the exposure apparatus in FIG.
- the spot A is a perfect circle
- the spots B and C are elliptical spots having a major axis in the radial direction of the resist substrate.
- spots B and C are arranged near the spot ⁇ so as to sandwich the spot ⁇ .
- the exposure control is the same as in the second embodiment.
- the recording power of the recording laser light is controlled so that the reflected light amount ratio is always constant.
- the asymmetry V of the recording signal of the optical disk manufactured by the exposure master can be kept constant.
- this exposure control method it is possible to accurately control a resist substrate in which the difference in BD recording sensitivity is small and there is a gradual difference in recording sensitivity in the radial direction.
- the method according to the embodiment- also has an advantage that the adjustment of the angle of the grating and the position adjustment of the recording laser optical system are easier than the method of the second embodiment.
- the exposure control method and the exposure evaluation method according to the present invention can also be applied to a method of exposing the above-mentioned inorganic resist material with light obtained by combining laser light and mercury lamp light. is there.
- a silicon wafer is used as a substrate 100 (Fig. 1A), and an intermediate layer 101 made of amorphous silicon is formed on the substrate by sputtering to a thickness of 80 nm. The film was formed in a uniform thickness.
- a resist layer 102 composed of an incomplete oxide of W and Mo was formed thereon uniformly by a snocting method (FIG. 1B).
- a spak ring was performed in the anoregon atmosphere using a S / ° target consisting of an incomplete oxide of W and Mo.
- the deposited resist layer was analyzed by EDX (Energy Dispersive X-ray Ana 1 ysls). The ratio of is 80:20
- the oxygen content was 60 at.%.
- the thickness of the resist layer was 55 nm.
- the resist substrate on which the formation of the resist layer was completed was placed on a turntable of the exposure apparatus shown in FIG. Next, while rotating the turntable at the desired number of revolutions, a laser having a power less than the irradiation threshold power was irradiated, and the longitudinal position of the objective lens was set by the actuator so that the force was adjusted to the resist layer. .
- the turn tape holder is moved to a desired radius 1 AI by the feed mechanism provided on the turn tape holder, and
- the laser light from one beam source was divided into three beams and irradiated on the surface of the resist layer.
- spot A irradiates the resist layer with an irradiation pulse corresponding to the pit according to the information data, Expose the test layer.
- Spot B measures the amount of reflected light from the resist layer before exposure.
- the exposure control is performed based on the exposure control method described in the second embodiment so that the asymmetry of the recording signal of the optical disk is + 9.5%, that is, the reflectance ratio is 0.92. Went.
- Exposure wavelength 405 nm
- optical disc having a diameter of 12 cm was obtained.
- the steps up to obtaining the optical disk from the exposure master were manufactured by a conventionally known technique.
- a pit with a length of 130 nm and a linear pit with a width of 149 nm are formed in a state corresponding to the actual signal pattern, and the recording capacity is 25 GB. It was confirmed that it was an optical disk.
- the process is performed by the conventional exposure method (recording parameter) without applying the exposure control method of the present invention. Conditions Produced optical disks.
- the exposure master was irradiated with a laser beam for evaluation, and the recording signal characteristics (reflectance ratio) according to the present invention were evaluated. Only the region of ⁇ 4 Omm was expected to satisfy the signal characteristics of the final product.
- the asymmetry is stably at almost the target value (+ 9.5%) over the entire length of the optical disk in the radial direction, and D V D-
- the product was a good product with excellent signal quality.
- the asymmetry increased greatly from the inner diameter to the outer diameter, and when judged by the DVD-R standard, the signals were located at the inner and outer peripheral portions. The quality was NG.
- the recording pits have been mainly described in the description of ⁇ .
- the present invention can be applied.
- the laser light when irradiating a laser beam for evaluation to an exposure master, the laser light can be stabilized by performing high-frequency superposition on a laser light source, for example, a semiconductor laser.
- a laser light source for example, a semiconductor laser.
- the pattern exposure of the resist layer with the recording laser beam is not limited to the case of performing each pit with a single pulsed light indicated by the curve a in FIGS. 12A to 12C. As shown in A to C, for example, in the recording of an nT mark, the recording with a (n-1) pulse, the recording with an n / 2 pulse light, or a dumbbell
- It can take various forms, for example, it can be made by pulsed light having a (recessed shape) pattern.
- the molding stamp 106 is directly formed from the master 104, but for example, a plurality of master stampers are manufactured from the master 104, and A mother stamper is manufactured by transferring the master's stamper, and a molding stamper 106 can be obtained.
- a plurality of masters can be obtained from one master 104 by the reason that according to the present invention, the information unevenness pattern of the master is constituted by an inorganic register, and this is tough. It becomes possible from and.
- the temperature of the semiconductor laser for obtaining the recording laser light and the evaluation laser light for performing the above-described manufacturing method of the present invention is controlled by, for example, a Peltier element or the like, and the humidity of the semiconductor laser is kept constant. It is desirable to stabilize the output of the laser light.
- the test signal of the exposure processing or immediately after the exposure, the recording signal characteristics (reflection light amount ratio, the reproduction signal related to the signal recorded on the exposure master) of the exposed portion.
- the quality of the final product can be determined based on the exposure conditions based on the asymmetry of the signal, and the results can be used to immediately determine or correct the recording power of the exposure apparatus for the next area to be exposed. It becomes. Further, the recording of the recording light is performed so that the ratio of the amount of reflected light is constant. By adjusting the power, the asymmetry of the recording signal of the final optical disc can be made constant over the entire disc.
- the exposure evaluation method of the present invention it is possible to estimate the asymmetry of the recording signal of the final optical disc from the exposure master, and it is possible to judge the signal quality of the final product at the stage of exposure. become able to.
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing Optical Record Carriers (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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KR1020047011154A KR101143795B1 (ko) | 2002-11-20 | 2003-11-20 | 광디스크 제조용 원반의 제작 방법 및 광디스크의 제조 방법 |
JP2004553223A JP4239975B2 (ja) | 2002-11-20 | 2003-11-20 | 光ディスク製造用原盤の作製方法及び光ディスクの製造方法 |
AT03811546T ATE521968T1 (de) | 2002-11-20 | 2003-11-20 | Verfahren zur herstellung eines stempels zur herstellung eines optischen datenträgers und herstellungsverfahren für optische datenträger |
EP03811546A EP1564734B1 (en) | 2002-11-20 | 2003-11-20 | Method for producing stamper used for producing optical disc and optical disc producing method |
US10/502,038 US7648671B2 (en) | 2002-11-20 | 2003-11-20 | Method of making master for manufacturing optical disc and method of manufacturing optical disc |
Applications Claiming Priority (2)
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JP2002336060 | 2002-11-20 | ||
JP2002-336060 | 2002-11-20 |
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WO2004047096A1 true WO2004047096A1 (ja) | 2004-06-03 |
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PCT/JP2003/014848 WO2004047096A1 (ja) | 2002-11-20 | 2003-11-20 | 光ディスク製造用原盤の作製方法及び光ディスクの製造方法 |
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US (1) | US7648671B2 (ja) |
EP (1) | EP1564734B1 (ja) |
JP (1) | JP4239975B2 (ja) |
KR (1) | KR101143795B1 (ja) |
CN (1) | CN100440349C (ja) |
AT (1) | ATE521968T1 (ja) |
TW (1) | TWI261835B (ja) |
WO (1) | WO2004047096A1 (ja) |
Cited By (3)
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JP2007280564A (ja) * | 2006-04-11 | 2007-10-25 | Sony Corp | 光ディスク原盤製造方法、光ディスク製造方法、光ディスク原盤製造装置 |
JP2009064542A (ja) * | 2007-08-10 | 2009-03-26 | Sony Disc & Digital Solutions Inc | ディスク原盤製造用の記録駆動波形調整方法、ディスク原盤製造方法、ディスク原盤製造装置、ディスク原盤 |
EP2110814A1 (en) | 2008-04-18 | 2009-10-21 | Fujifilm Corporation | Manufacturing method for a stamper and manufacturing method for an optical information recording medium using the stamper |
Families Citing this family (6)
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JP2008192281A (ja) * | 2007-01-12 | 2008-08-21 | Ricoh Co Ltd | パターン及びその形成方法 |
JP2010118121A (ja) * | 2008-11-13 | 2010-05-27 | Sony Disc & Digital Solutions Inc | 光ディスク用原盤の製造方法、光ディスク用原盤、スタンパ、及び光ディスク |
JP2010170587A (ja) * | 2009-01-20 | 2010-08-05 | Sony Corp | スタンパ製造方法、再生専用型光ディスク製造方法 |
JP2011175693A (ja) * | 2010-02-23 | 2011-09-08 | Sony Corp | 露光装置、及び、露光方法 |
CN102446532A (zh) * | 2010-10-09 | 2012-05-09 | 中影克莱斯德数字媒介有限责任公司 | 激光画面光盘及其制造方法 |
DE16159741T1 (de) * | 2016-03-10 | 2018-02-01 | Joanneum Research Forschungsgesellschaft Mbh | Verfahren zur herstellung eines hochauflösenden analogen speichermediums |
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- 2003-11-20 AT AT03811546T patent/ATE521968T1/de active
- 2003-11-20 US US10/502,038 patent/US7648671B2/en not_active Expired - Fee Related
- 2003-11-20 TW TW092132572A patent/TWI261835B/zh not_active IP Right Cessation
- 2003-11-20 WO PCT/JP2003/014848 patent/WO2004047096A1/ja active Application Filing
- 2003-11-20 EP EP03811546A patent/EP1564734B1/en not_active Expired - Fee Related
- 2003-11-20 JP JP2004553223A patent/JP4239975B2/ja not_active Expired - Fee Related
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EP2110814A1 (en) | 2008-04-18 | 2009-10-21 | Fujifilm Corporation | Manufacturing method for a stamper and manufacturing method for an optical information recording medium using the stamper |
Also Published As
Publication number | Publication date |
---|---|
KR20050074273A (ko) | 2005-07-18 |
EP1564734A1 (en) | 2005-08-17 |
KR101143795B1 (ko) | 2012-06-14 |
US20050128926A1 (en) | 2005-06-16 |
JPWO2004047096A1 (ja) | 2006-03-23 |
TW200423117A (en) | 2004-11-01 |
CN100440349C (zh) | 2008-12-03 |
US7648671B2 (en) | 2010-01-19 |
EP1564734B1 (en) | 2011-08-24 |
ATE521968T1 (de) | 2011-09-15 |
CN1692417A (zh) | 2005-11-02 |
JP4239975B2 (ja) | 2009-03-18 |
TWI261835B (en) | 2006-09-11 |
EP1564734A4 (en) | 2007-10-31 |
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