摘要:
An optical disk storing write-once information usable for protecting the copyright of the software by preventing the duplication, unauthorized use, etc., of the software. In the optical disk, a recording layer (213) is formed on a disk substrate (211) with a dielectric layer (212) inbetween. Then, an intermediate dielectric layer (214) and a reflecting layer (215) are successively laminated upon the recording layer (213), and an overcoat layer (216) is formed on the surface of the reflecting layer (215). A plurality of BCA (one of write-once identification information systems) sections (220a and 220b) are recorded by lowering the vertical magnetic anisotropy of the recording layer (213). At the time of reproduction, the write-once information is detected from differential signals.
摘要:
In an optical disc, an ID field contains a plurality of address information, and is preliminarily recorded in convex and concave signals, and is composed of two sets offset by about 1/2 track pitch toward the internal or external track direction adjacent to the guide track, an information recording field is composed of grooves and lands oscillating at a single frequency in the radial direction, and the grooves and lands alternate in every revolution of the guide track. When w bits of information are included in one period of oscillation, an information unrecorded field between the ID field and information recording field is arranged to have a length of w/10 bits or more and/or w bits or less, and therefore, when recording continuous information data such as video data, it is possible to record continuously by generating a clock securely from the oscillating signal, and moreover, the format efficiency is improved, so that a format of a larger capacity is achieved.
摘要:
The optical recording medium of this invention includes: a first substrate having a first information surface; a semitransparent reflection film formed on the first information surface of the first substrate; a second substrate having a second information surface; a reflection film formed on the second information surface of the second substrate; and an adhesive layer for adhering the first substrate and the second substrate so that the first information surface and the second information surface face each other, wherein the thickness of the first substrate is 0.56 mm or more, the thickness of the adhesive layer is 30 mu m or more, and the total thickness of the first substrate and the adhesive layer is 0.68 mm or less.
摘要:
The code conversion method of the present invention includes the steps of: scrambling an input main data unit based on any of plural types of pseudo-random number sequences; modulating the scrambled main data unit based on any of plural types of modulation data; producing an output main data unit from the modulated main data unit; obtaining a calculated value representing a difference between a number of 0 bits and a number of 1 bits included in the output main data unit; and selecting any of the modulation data dependent upon the calculated value. The code conversion method of the present invention is characterized by further including the steps of: determining whether or not a variation of the calculated value has exceeded a predetermined threshold value; newly selecting another pseudo-random number sequence used for the step of scrambling if it is determined that the variation of the calculated value has exceeded the predetermined threshold value; and re-scrambling the input main data unit based on the newly selected pseudo-random number sequence.
摘要:
An equipment management system is provided in which: two exchangeable record-medium recording units and an exchangeable record-medium regeneration unit are connected via an in-house network, so that they can communicate with each other; and one of these pieces of equipment is master equipment which manages resource information on the pieces of equipment, and the other pieces of equipment are slave equipment which is controlled by the master equipment.
摘要:
The code conversion method of the present invention includes the steps of: scrambling an input main data unit based on any of plural types of pseudo-random number sequences; modulating the scrambled main data unit based on any of plural types of modulation data; producing an output main data unit from the modulated main data unit; obtaining a calculated value representing a difference between a number of 0 bits and a number of 1 bits included in the output main data unit; and selecting any of the modulation data dependent upon the calculated value. The code conversion method of the present invention is characterized by further including the steps of: determining whether or not a variation of the calculated value has exceeded a predetermined threshold value; newly selecting another pseudo-random number sequence used for the step of scrambling if it is determined that the variation of the calculated value has exceeded the predetermined threshold value; and re-scrambling the input main data unit based on the newly selected pseudo-random number sequence.
摘要:
In an optical disc, an ID field contains a plurality of address information, and is preliminarily recorded in convex and concave signals, and is composed of two sets offset by about 1/2 track pitch toward the internal or external track direction adjacent to the guide track, an information recording field is composed of grooves and lands oscillating at a single frequency in the radial direction, and the grooves and lands alternate in every revolution of the guide track. When w bits of information are included in one period of oscillation, an information unrecorded field between the ID field and information recording field is arranged to have a length of w/10 bits or more and/or w bits or less, and therefore, when recording continuous information data such as video data, it is possible to record continuously by generating a clock securely from the oscillating signal, and moreover, the format efficiency is improved, so that a format of a larger capacity is achieved.
摘要:
An optical disc comprising a read-only (ROM) field and a rewritable field and a rewritable field has a constant track pitch To in the read-only field and a variable track pitch Tw of the rewritable field, set in a relation of To > = Tw. Thus the data capacity of the disc may be increased by reducing the track pitch Tw of the rewritable field, while compatibility is assured by recording the control information at the known track pitch To in the read-only field.
摘要:
An optical disc or other optical recording medium enables reading barcode-shaped BCA marks in a burst cutting area (BCA) with tracking on while making tampering with the BCA marks difficult. The optical disc (100) has a first area (102) containing tracks at a first track pitch (d2), and a second area (101) containing tracks at a second track pitch (d1), pre-pits or pre-grooves being formed along the track. The barcode-shaped marks (104) are recorded in the second area, and the second track pitch is equal to or more than five times wider than the first track pitch.