Source: http://www.google.com/patents/US6285764?ie=ISO-8859-1&dq=patent:3079728
Timestamp: 2014-07-10 03:59:36
Document Index: 73495768

Matched Legal Cases: ['application No. 96915172', 'application No. 95', 'application No. 95', 'application No. 11', 'application No. 11', 'application No. 11']

Patent US6285764 - Optical disk, an optical disk barcode forming method, an optical disk ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsDisclosed is an optical disk barcode forming method wherein, as information to be barcoded, position information for piracy prevention, which is a form of ID, is coded as a barcode and is recorded by laser trimming on a reflective film in a PCA area of an optical disk. When playing back the thus manufactured...http://www.google.com/patents/US6285764?utm_source=gb-gplus-sharePatent US6285764 - Optical disk, an optical disk barcode forming method, an optical disk reproduction apparatus, a marking forming apparatus, a method of forming a laser marking on an optical disk, and a method of manufacturing an optical diskAdvanced Patent SearchPublication numberUS6285764 B1Publication typeGrantApplication numberUS 09/679,233Publication dateSep 4, 2001Filing dateOct 4, 2000Priority dateOct 9, 1995Fee statusPaidAlso published asCN1154097C, CN1173942A, CN1200406C, CN1324592C, CN1379394A, CN1545088A, CN1547202A, CN100342443C, DE69610859D1, DE69610859T2, DE69610860D1, DE69610860T2, DE69610861D1, DE69610861T2, DE69611906D1, DE69611906T2, DE69614580D1, DE69614580T2, DE69615418D1, DE69615418T2, DE69617478D1, DE69617478T2, DE69618633D1, DE69618633T2, DE69624390D1, DE69624390T2, DE69626329D1, DE69626329T2, DE69631914D1, DE69631914T2, DE69633031D1, DE69633031T2, DE69633353D1, DE69633353T2, DE69637606D1, EP0807929A1, EP0807929A4, EP0807929B1, EP1003162A1, EP1003162B1, EP1005033A1, EP1005033B1, EP1005034A1, EP1005034B1, EP1005035A1, EP1005035B1, EP1006516A1, EP1006516B1, EP1006517A1, EP1006517B1, EP1028422A1, EP1028422B1, EP1028423A1, EP1028423B1, EP1030297A1, EP1030297B1, EP1031974A1, EP1031974B1, EP1251501A1, EP1251501B1, EP1251502A1, EP1251502B1, EP1465164A2, EP1465164A3, EP1465164B1, EP1659580A2, EP1659580A3, EP1659580B1, US6052465, US6122373, US6125181, US6128388, US6141419, US6160888, US6175629, US6208736, US6229896, US6278671, US6285762, US6285763, US6298138, US6449366, US6457128, US6470452, US6480960, US6552969, US6600706, US6618347, US6728882, US6757391, US6862685, US7095697, US7103781, US7110544, US7520001, US8014236, US8472291, US20020070282, US20020080961, US20020089920, US20020097871, US20030172286, US20040184394, US20060131407, US20090168619, US20110286315, WO1997014146A1Publication number09679233, 679233, US 6285764 B1, US 6285764B1, US-B1-6285764, US6285764 B1, US6285764B1InventorsYoshiho Gotoh, Mitsuaki Oshima, Shinichi Tanaka, Kenji Koishi, Mitsuro MoriyaOriginal AssigneeMatsushita Electric Industrial Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (52), Non-Patent Citations (7), Referenced by (1), Classifications (166), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetOptical disk, an optical disk barcode forming method, an optical disk reproduction apparatus, a marking forming apparatus, a method of forming a laser marking on an optical disk, and a method of manufacturing an optical diskUS 6285764 B1Abstract Disclosed is an optical disk barcode forming method wherein, as information to be barcoded, position information for piracy prevention, which is a form of ID, is coded as a barcode and is recorded by laser trimming on a reflective film in a PCA area of an optical disk. When playing back the thus manufactured optical disk on a reproduction apparatus, the barcode data can be played back using the same optical pickup.
DESCRIPTION OF THE REFERENCE NUMERALS 584. LOW-REFLECTIVITY PORTION, 586. LOW REFLECTIVITY LIGHT AMOUNT DETECTOR, 587. LIGHT AMOUNT LEVEL COMPARATOR, 588. LIGHT AMOUNT REFERENCE VALUE, 599. LOW REFLECTIVITY PORTION START/END POSITION DETECTOR, 600 LOW-REFLECTIVITY PORTION POSITION DETECTOR, 601. LOW-REFLECTIVITY PORTION ANGULAR POSITION SIGNAL OUTPUT SECTION, 602. LOW-REFLECTIVITY PORTION ANGULAR POSITION DETECTOR, 605. LOW-REFLECTIVITY PORTION START POINT, 606. LOW-REFLECTIVITY PORTION END POINT, 607. TIME DELAY CORRECTOR, 816. DISK MANUFACTURING PROCESS, 817. SECONDARY RECORDING PROCESS, 818. DISK MANUFACTURING PROCESS STEPS, 819. SECONDARY RECORDING PROCESS STEPS, 820. SOFTWARE PRODUCTION PROCESS STEPS, 830. ENCODING MEANS, 831. PUBLIC KEY ENCRYPTION, 833. FIRST SECRET KEY, 834. SECOND SECRET KEY, 835. COMBINING SECTION, 836. RECORDING CIRCUIT, 837. ERROR-CORRECTION ENCODER, 838. REED-SOLOMON ENCODER, 839. INTERLEAVER, 840. PULSE INTERVAL MODULATOR, 841. CLOCK SIGNAL GENERATOR, 908. ID GENERATOR, 909. INPUT SECTION, 910. RZ MODULATOR, 913. CLOCK SIGNAL GENERATOR, 915. MOTOR, 915. ROTATION SENSOR, 916. COLLIMATOR, 917. CYLINDRICAL LENS, 918. MASK, 919. CONVERGING LENS, 943.2. FIRST TIME SLOT, 921. SECOND TIME SLOT, 922. THIRD TIME SLOT, 923. STRIPE, 924. PULSE, 925. FIRST RECORDING REGION, 926. S ECO ND RECORDING REGION, 927. ECC ENCODER, 928. ED-CC DECODER, 929. LASER POWER SUPPLY CIRCUIT, 930. STEPS (IN CAV PLAYBACK FLOWCHART), 931. BEAM DEFLECTOR, 932. SLIT, 933. STRIPE, 934. SUB-STRIPE, 935. DEFLECTION SIGNAL GENERATOR, 936. CONTROL DATA AREA, 937. STRIPE PRESENCE/ABSENCE IDENTIFIER, 938. ADDITIONAL STRIPE PSRETION, 939. ADDITIONAL STRIPE PRESENCE/ABSENCE IDENTIFIER, 940. STEPS (FOR STRIPE PRESENCE/ABSENCE IDENTIFIER PLAYBACK FLOWCHART), 941. OPTICAL MARKING (PINHOLE), 942. PE-RZ DEMODULATOR, 943. LPF, 944. ADDRESS AREA, 945. MAIN BEAM, 949. SUB-BEAM, 948. STRIPE REVERSE-SIDE RECORD IDENTIFIER, 949. STRIPE GAP PORTION, 950. SCANNING MEANS, 951. DATA ROW, 952. ECC ROW, 953. EDGE-SPACING DETECTING MEANS, 954. COMPARING MEANS, 951. MEMORY MEANS, 956. OSCILLATOR, 957. CONTROLLER, 958. MOTOR DRIVE CIRCUIT, 959. BARCODE READING MEANS, 963. MODE SWITCH, 964. HEAD MOVING MEANS, 965. FREQUENCY COMPARATOR, 966. OSCILLATOR, 967. FREQUENCY COMPARATOR, 968. OSCILLATOR, 969. MOTOR
(c) A comparison between single-plate disk and laminated disk has been described above, using a two-layer laminated disk as an example. As is apparent from the above description, the same effect as obtained with the two-layer laminated disk can be obtained with the single-layer laminated disk. Using FIGS. 12(a), 12(b), etc., a further description will be given dealing with the single-layer laminated disk type. As shown in FIG. 12(a), the reflective layer 802 has the transparent substrate 801 of polycarbonate on one side, and the hardened adhesive layer 804 and a substrate on the other side, the reflective layer 802 thus being hermetically sealed therebetween. In this condition, pulsed laser light is focused thereon for heating; in the case of our experiment, heat of 5 μJ/pulse is applied to a circular spot of 10 to 20 μm diameter on the reflective layer 802 for a short period of 70 ns. As a result, the temperature instantly rises to 600� C., the melting point, melting state is caused. By heat transfer, a small portion of the transparent substrate 801 near the spot is melted, and also a portion of the adhesive layer 804 is melted. The molted aluminum in this state is caused by surface tension to build up along boundaries 821 a and 821 b, with tension being applied to both sidles, thus forming buildups 822 a and 822 b of hardened aluminum, as shown in FIG. 12(b). The nonreflective portion 584 free from aluminum residues is thus formed. This shows that a clearly defined nonreflective portion 584 can be obtained by laser-trimming the laminated disk as shown in FIGS. 10(a) and 12(a). Exposure of the reflective layer to the outside environment due to a damaged protective layer, which was the case with the single-plate type, was not observed even when the laser power was increased more than 10 times the optimum value. After the laser trimming, the nonreflective layer 584 has the structure shown in FIG. 12(b) where it is sandwiched between the two transparent substrates 801, 803 and sealed with the adhesive layer 804 against the outside environment, thus producing the effect of protecting the structure from environmental effects.
The present invention uses RZ recording, as shown in FIG. 24. In this RZ recording, one unit time is divided 51 into a plurality of time slots, for example, a first time slot 920 a, a second time slot 921, a third time slot 922, and so on. When data is �00�, for example, a signal 924 a of a duration shorter than the period of the time slot, that is, the period T of a channel clock, is recorded in the first time slot 920 a, as shown in part (1) in FIG. 26. The pulse 924 a whose duration is shorter than the period T of the recording clock is output between t=T1 and t=T2. In this case, using a rotation pulse from the rotation sensor 915 a on the motor 915, the clock signal generator 913 generates a modulation clock pulse as shown in part (1) of FIG. 24; by performing the recording in synchronism with the clock pulse, the effects of rotational variation of the motor can be eliminated. In this way, as shown in part (2) of FIG. 24, a stripe 923 a indicating �00� is recorded on the disk within a recording region 925 a, the first of the four recording regions shown, and a circular barcode such as shown in part (1) of FIG. 27 is formed.
FIG. 26 shows signals and an arrangement of stripes when the RZ recording shown in FIG. 24 is PE-modulated. As shown, data �0� is recorded in the left-hand time slot 920 a of the two time slots 920 a and 921 a; on the other hand, data 1 is recorded in the right-hand time slot 921 a, as shown in part (3) of FIG. 26. On the disk, data �0� is recorded as a stripe 923 a in the left-hand recording region 925 a and data �1� as a stripe 923 b in the right-hand recording region 926 b, as shown in parts (2) and (4) of FIG. 26, respectively. Thus, for data �010�, a pulse 924 c is output in the left-hand time slot for �0�, a pulse 924 d is output in the right-hand time slot for �1�, and a pulse 924 e is output in the left-hand time slot for �0�, as shown in part (5) of FIG. 26; on the disk, the first stripe is formed in the left-hand position, the second stripe in the right-hand position, and the third stripe in the left-hand position, by laser trimming. FIG. 26(5) shows signals modulated with data �010�. As can be seen, a signal is always available for every channel bit. That is, since the signal density is constant, the DC component does not vary. Since the DC component does not vary, PE modulation is resistant to variation in low-frequency components even if a pulse edge is detected during playback. This has the effect of simplifying playback demodulator circuitry of the disk playback apparatus. Furthermore, since one signal 923 is always available for every channel clock 2T, this has the effect of being able to reproduce a synchronization clock for a channel clock without using a PLL.
Further, as shown in FIG. 30, the control data also contains an additional stripe data presence/absence identifier and a stripe recording capacity. That is, after recording first stripes on an optical disk, additional stripes can be recorded in an empty, unrecorded portion of the area. The first recorded stripes will be referred to as the first set of stripes, and the additionally recorded stripes as the second set of stripes. With this configuration, when the first set of stripes 923 is already recorded by trimming, as shown in FIG. 30, the capacity of the available space for trimming the second set of stripes 938 can be calculated. Accordingly, when the recording apparatus of FIG. 23 performs trimming to record the second set of stripes, the control data provides an indication of how much space is available for additional recording; this prevents the possibility of destroying the first set of stripes by recording more than 360� over the area. Furthermore, as shown in FIG. 30, a gap 949 longer than ore pit-signal frame length is provided between the first set of stripes 923 and the second set of stripes 938; this serves to prevent the previously recorded trimming data from being destroyed.
First, to achieve the switch recording of FIG. 29, provisions must be made so that two or more pulses will not occur within one time slot, that is, within 1T interval. Switch recording is possible in the data area because data is recorded there with a PE-RZ code, as shown in FIG. 33(a). However, in the case of the synchronization code of FIG. 34(a), since irregular channel bits are arranged, with the usual method two pulses may occur within 1T, in which case the switch recording of the invention is not possible. To address this problem, the invention employs, for example, the bit pattern �01000110� as shown in FIG. 37. With this bit pattern, in Ti a pulse occurs for the �1� on the right, in T2 no pulses occur, in T3 a pulse occurs for the �1� on the right, and in T4 a pulse occurs for the �1� on the left; in this way, two or more pulses cannot occur within one time slot. Thus, the synchronization code structure of the invention has the effect of achieving switch recording, increasing the production rate by a factor of 2.
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