Abstract:
There is provided herein an optical storage media which has low VBR. In a preferred embodiment, there is provided an optical disk comprising a genus of copolycarbonates, including copolyestercarbonates, which have excellent physical and optical properties. Said copolycarbonates have proportions of structural units which fall within a specific composition range, and said range defines certain materials, a large percentage of which can be molded into optical disks having the desired optical properties, including low VBR.
Abstract:
The invention can be applied to a recorder for CDs and DVDs, a recording method therefor, and a recording medium. On an optical d isk, second information on characters and graphics and so forth are recorded clearly by smooth recording between two recording levels. The second information is recorded in a predetermined region defined in radial and angular directions on an optical information recording medium. The second information is recorded in the form of variation of width, length, depth or swell of pits caused by the variation in intensity of a laser beam or by the turn on-off of the laser beam. The second information is a pattern like a watermark or a visible image which can be checked visually.
Abstract:
A data recording medium having a plurality of concentric or spiral tracks for recording information represented as marks and spaces between the marks, the marks being formed by emitting to a track recording surface an optical beam modulated by a plurality of drive pulses where the drive pulses count is adjusted according to a length of a mark part in the original signal to be recorded to the track, said data recording medium comprising: a data recording area for recording data, and a specific information recording area for recording when the data recording medium is loaded into a particular recording device, device specific information specific to the particular recording device and at least one of a specific first pulse position Tu and a specific last pulse position Td of a drive pulses sequence required by the partic ular recording device to record said marks to the data recording medium.
Abstract:
In a method of manufacturing a matrix for making optical storage media a plate-shaped matrix body is formed. Then a resist coating is applied on one side of the body by spinning a polymer over the body starting from a central portion of the body with a view to forming a blank for a matrix. Finally a central opening is formed in the body, preferably by punching the central portion of the body, thereby forming a raw matrix with a resist coating extending from the peripheral edge of the central opening.
Abstract:
A magneto-optic disk (10) has recording tracks (11) formed along concentric grooves (12) or a spiral groove (12), non-grooved portions formed in positions of the recording tracks (11), pit patterns representing information on the recording tracks (11) and formed on the non-grooved portion, and track-counting grooves (14) adapted for optically detecting that the light spot of a reading laser beam traverses a recording track (11) and provided in the non-grooved portions. Therefore, a high-speed access to a desired recording track is adequately performed while enabling high-density recording.
Abstract:
An apparatus and method for optimizing the writing of data to an optical disc. An optimization circuit (200) generates an optimized modulation signal which modulates a writing beam of a laser beam recorder (204), the optimized modulation signal comprising a series of data symbols (240) that correspond to resulting pits and lands on the optical disc (130, 140, 150, 160). The optimization circuit individually adjusts leading and trailing edges of the data symbols, as well as amplitudes of the data symbols. The selective placement of pit and land transitions can be used to embed a second set of data on the optical disc to provide watermarks or anti-piracy hidden codes. Electrical jitter errors, including data correlated jitter, can further be minimized through a master driver circuit (300) which can be used to reclock an initial modulation signal prior to generation of the optimized modulation signal by the optimization circuit.
Abstract:
A method for the manufacturing of a three-dimensional information carrier by photolithography is presented. The information carrier has a plurality of data regions (5, 5') spaced apart by intermediate layers (6). The data regions are made of a composition containing a fluorescent material and a photosensitive material, and the intermediate layers are made of a non-fluorescent material.
Abstract:
A recorder wherein a PD (81) is placed at a predetermined position on an optical plate, a resist master disk (110) is stopped rotating, a laser (73) for focusing is energized, and a head (77) is brought to a proper position by a head slider control circuit (101). The master disk (110) is rotated to start a focus servocircuit (103), and the PD (81) is moved right and left by a small amount by a focus fine-adjusting circuit (99) to meet estimated proper focus position data. A difference in the voltage signals from the two output terminals of PD (81) fluctuates due to a surface fluctuation and a small motion caused by the rotation of the master disk (110). Therefore, a differential amplifier (103a) moves a recording lens (77a) up and down by several microns so that error signals will become zero. At this moment, the numerical data of a digital display (93) is compared with the focus position data. When the two are in agreement, the focus position data is used as a proper focus position data to initially set a proper focus position. When they are not in agreement, the data is rewritten to use the numerical data as a proper focus position data. Upon using the proper focus position data in the form of a numeral, the operation for initially setting a proper focus position can be easily carried out depending upon the type of the resist master disk.
Abstract:
The invention relates to a method of manufacturing a stamper for producing optical discs, comprising the application of a photoresist to a stamper plate and the structuring of the applied photoresist film, wherein said structuring comprises the successive exposer, development and heating of said photoresist film, wherein the developed photoresist film is subjected to an additional exposure step in the deep UV range prior to the final heat treatment. The effective dose of said additional exposure step ranges between 4.10 and 5.10 J/cm . The invention furthermore relates to a stamper and to an optical disc obtained by means of such a stamper.
Abstract translation:本发明涉及一种制造用于生产光盘的压模的方法,包括将光致抗蚀剂施加到压模板和施加的光致抗蚀剂膜的结构,其中所述结构包括所述光致抗蚀剂膜的连续曝光,显影和加热, 其中显影的光致抗蚀剂膜在最终热处理之前在深UV范围内进行额外的曝光步骤。 所述附加暴露步骤的有效剂量范围在4.10-4和5.10-2J / cm 2之间。 本发明还涉及一种压模和通过这种压模获得的光盘。
Abstract:
An improved method of making an optical disc comprises the steps of exposing a photoresist glass master to a laser beam for recording data on an information area of the master, subjecting the master to a second graphic exposure and subsequently developing, metallizing and electroforming the master to form a stamper which can be used to produce optical discs by injection moulding. The areas of the master which are subjected to the graphic exposure are located both within and outside the information area and are so arranged that the exposed areas within the information area do not interfere with or cause data error during playing of an optical disc produced from the master. In this way, the whole of the playing area of an optical disc can be covered with printed or graphic information.