-
公开(公告)号：JPH1153772A
公开(公告)日：1999-02-26
申请号：JP20697897
申请日：1997-07-31
Applicant: SONY CORP
Inventor： IMANISHI SHINGO , HIDA MINORU , MASUHARA SHIN , KASHIWAGI TOSHIYUKI
IPC: G11B7/24 , G11B7/26 , G11B11/10 , G11B11/105
Abstract: PROBLEM TO BE SOLVED: To suppress an effect of an offset to a regenerative signal and to sufficiently obtain clock information also by wobbling groove both side edges so as to become a phase opposite to each other and recording a clock signal with a change of a groove width. SOLUTION: Since a groove G whose both side edges are wobbled at the phase opposite to each other, it becomes the state being width modulated so that the groove width is fluctuated periodically. A land L between the grooves G is similar also. Although the user data containing redundancy such as an error correction code, etc., are recorded/reproduced on a clock area, a data part, by that the groove is width modulated, an external clock is generated from this signal, and the user data are recorded/reproduced synchronized with this. In the groove G, the wobble is left/right symmetric when viewing from a track center, and return light is changed by a track width change, and e.g. when a bisected photodetector is used, a return light change is detected by a sum signal. On the other hand, in the groove G, address information is obtained from an address area wobbled at the same phase.
-
公开(公告)号：JPH10112050A
公开(公告)日：1998-04-28
申请号：JP28323096
申请日：1996-10-04
Applicant: SONY CORP
Inventor： HORIGOME HIDEYOSHI , HIDA MINORU , FUJITA GORO , TOSAKA SUSUMU
Abstract: PROBLEM TO BE SOLVED: To provide a high-density recording in recording scanning for a recording medium in which circulating tracks having data area on the land and the groove are formed in a double spiral shape by switching alternately tracking control to the centers of the land and the groove for each circulating track. SOLUTION: For a recording medium which uses both the groove GB and land LD formed in a double spiral shape as data recording tracks, recording scanning SSR is performed by the scan which advances the track pitch one by one in the radial direction. The recording scan shown by a broken line SSR is advanced by two track pitches in the radial direction at each circulation since the laser spot LSP proceeds through each center of the groove track which uses the groove GB and the land track which uses the land LD. Hence, the recording scan SSR is set to return by one track pitch at the time when one circular scan is finished. By this, a large-capacity recording is constituted.
-
公开(公告)号：JPH1049876A
公开(公告)日：1998-02-20
申请号：JP21777596
申请日：1996-07-31
Applicant: SONY CORP
Inventor： FUJITA GORO , HIDA MINORU
Abstract: PROBLEM TO BE SOLVED: To enhance the track density in the radial direction of a disk and increase the recording capacity while enabling tracking control. SOLUTION: A servo area of 24SCK length is provided at an address segment and a data segment. Segment marks and track marks are formed in the servo area by embossing or the like. The segment marks are formed at first position- seventh position in the servo area. Marks 1 are formed at succeeding 11th and 12th positions, and marks 2 are formed at 16th and 17th positions. Each of the marks 1 and 2 is formed every two tracks in a radial direction, and phases of the marks 1 and 2 are different by 180 deg.C. Whether it is a track of an even number or an odd number is distinguished from the presence/absence of a mark at the seventh position of the segment mark. Even when a polarity of a tracking error signal is inverted between the tracks of even and odd numbers, tracking control is conducted correctly.
-
公开(公告)号：JPH08115523A
公开(公告)日：1996-05-07
申请号：JP21792095
申请日：1995-08-25
Applicant: SONY CORP
Inventor： OTSUKA GAKUSHI , FUJITA GORO , HIDA MINORU
Abstract: PURPOSE: To make it possible to give medium information to a reproducing device by medium information regions by making it possible to read the parameter information without requiring a decoding circuit exclusively used. CONSTITUTION: One round of tracks is divided into 1400 segments and these segments are classified into address segments ASEG and data segments DSEG. Plural concentrical tracks are formed on an optical disk. The plural segments consisting of servo areas ARs provided with servo pits to apply the servo information to a disk drive and data area ARd are respectively formed in the respective tracks. The plural segments include the address segmented ASEG which are formed in the same positions in the radial direction of the respective tracks and are recorded with the address information in the data areas ARd and the data segments DSEG recorded with user data. The medium information regions recorded with the medium information expressed by gray codes are formed in the data areas ARd of the plural tracks near the inner peripheral end and near the outer peripheral end.
-
公开(公告)号：JPH0883470A
公开(公告)日：1996-03-26
申请号：JP21768394
申请日：1994-09-12
Applicant: SONY CORP
Inventor： SAKO YOICHIRO , YAMAGAMI TAMOTSU , OTSUKA GAKUSHI , HIDA MINORU
Abstract: PURPOSE: To improve correcting capability to a burst error by performing error correction/detection coding processing for every prescribed unit region of data, recording alternately odd number unit regions and even number unit regions in adjacent sectors. CONSTITUTION: A series of data, for example, Da1 to m(n-2) , Da1 to m(n-1) , Da1 to m(n) , Da1 to m(n+1) , Da1 to m(n+2) are recorded in continued sectors Sn-2 ,n-1 ,n ,n+1 ,n+2 . For example, odd numbered data Da1 ,3 ,...(n-1) out of data Da1-m(n-1) segmented as data of the sector Sn-1 is recorded in the sector Sn-1 , and data Ud(n-1) of not yet defined region including read Solomon code parity generated in the above and LDC parity LDC( N-1) also are recorded in the sector S(n-1) . Also, even numbered data Da2 ,4 ,...(n-1) are recorded in the adjacent sector Sn . Since data read out from plural different sectors are constituted again and outputted as data segmented to the original unit regions, the device is strong against a burst error.
-
Patent Agency Ranking
公开(公告)号：JPH07334928A
公开(公告)日：1995-12-22
申请号：JP15258894
申请日：1994-06-10
Applicant: SONY CORP
Inventor： NAKAO SHINICHI , KOBAYASHI SHOEI , HIDA MINORU
IPC: G11B20/10
Abstract: PURPOSE:To reliably reproduce data even when the area for detecting DC levels is defective by fetching the signal level of the first reproduced signal every specified period and sample-holding the DC level of the first reproduced signal in the present period. CONSTITUTION:When one or more defects DF are present in the area CL for detecting the DC level of a disk-shaped recording medium 11, the second sample- hold holds the voltage value sample-held during the period before the previous one to output it as a DC level S33. As the results, a second reproduced signal S16 is obtained by detecting the fluctuation of the DC level of the first reproduced signal S10 based on the difference between the DC level S33 and the first reproduced signal S10 and thereby data is reliably reproduced.
-
公开(公告)号：JPH0773606A
公开(公告)日：1995-03-17
申请号：JP23894093
申请日：1993-08-31
Applicant: SONY CORP
Inventor： HIDA MINORU , FUNABASHI TAKESHI
Abstract: PURPOSE:To enable sure reproduction of important data by dividing a storage region to sectors, recording user data, identification data of the user data, etc., into the respective sectors and subjecting the user data to replacement processing on the bases of the identification data. CONSTITUTION:The recording region of the optical disk is divided to the sectors and the identification data VU1 to VU4, the codes for error detection and correction of the data VU1 to VU4, etc., are recorded by each of the respective sectors together with the user data DO to D511, etc. The user data DO to D511 are subjected to reproduction, error correction, etc., on the basis of the user data VU1 to VU4. The important data are compared with a reference value which is small in bit error rate by the data VU1 to VU4 as a basis. The data DO to D511 is subjected to the replacement processing before the deterioration progresses. As a result, the important data, such as directory, is more surely reproduced.
-
公开(公告)号：JPH0721615A
公开(公告)日：1995-01-24
申请号：JP19171093
申请日：1993-07-05
Applicant: SONY CORP
Inventor： HIDA MINORU
IPC: G11B11/10 , G11B11/105
Abstract: PURPOSE:To sufficiently and surely suppress the fluctuation of reproducing signals by correcting a level with the reproducing signal level of a reference area detected from a disk-like recording medium as a reference or performing pre-holding with a correction value. CONSTITUTION:Data for phase matching and level detection are preformated in the servo areas of the optical heads of respective segments for a disk 2. The phase shift of clocks is corrected with the phase matching information of logic '1' and '0' as the reference. Also, a reference level for demodulation is set with the difference RVL of the maximum and minimum of the similar information for the level detection as the reference. A timing generator 9 issues clamp pulses CL1 and CL2 with the output of a PLL circuit 8 as the reference. A sum signal SW is processed with a data clock DCK as the reference, a clamping circuit 14 is operated with a servo clock SCK as the reference and DC fluctuation is reduced. An A/D converter 13 converts the reproducing signal RF of the output of a selector 12 with a signal DCK as the reference and the clamping circuit 14 detects the reproducing signal level in a clamp area and sends it through a detection circuit 15 to a control circuit 16.
-
公开(公告)号：JPH06259889A
公开(公告)日：1994-09-16
申请号：JP4282193
申请日：1993-03-03
Applicant: SONY CORP
Inventor： YAMAGAMI TAMOTSU , HIDA MINORU
Abstract: PURPOSE:To shorten tact time in injection molding of a disk and to obtain a disk in which a ghost pit is hard to occur by providing a pseudo pit in a region in which zero pit section is continued for the prescribed period or more. CONSTITUTION:Data after modulation is detected with the prescribed bits 17 unit in a disk signal recording method which records data in an optical disk 13 by such a modulation system that zero bit 16 periods are continued infinitely. When all bits 16 detected by this prescribed bits 17 unit are zero, a pseudo bit 15 is inserted to a fixed position within the prescribed bits unit and all bits 16 are recorded in the disk 13. By using this method, such a signal that zero data is continued long by a modulation method such as NRZ and NRZ1 is detected with the prescribed bits unit, for example 8 bits unit. When all bits in this 8 bits are zero, a pseudo bits is inserted to a fixed position in 8 bits, for example, between a 4th bit and 5th bit. Thereby, zero bit section is shortened, and a disk having no ghost pit and good quality is obtained.
-
公开(公告)号：JPH0432074A
公开(公告)日：1992-02-04
申请号：JP13868790
申请日：1990-05-29
Applicant: SONY CORP
Inventor： HIDA MINORU
Abstract: PURPOSE:To surely obtain the information of a sector even if a defect is generated in a segment of a header by providing a table for showing specific information, and a control area for designating its address on every sector. CONSTITUTION:A table for showing specific information and a control area for designating its address are provided on every sector. Therefore, a ROM map for indicating an address of a ROM sector is provided, and the address of this ROM map is indicated by a map pointer of a control track. In such a way, by providing plural ROM maps, a large quantity of ROM sectors can be designated, and the ROM map can be interspersed in the vicinity of a desired sector, therefore, the access time is shortened. Also, by adding an error correcting code to these information, information of the sector is obtained surely.
-
-
-
-
-
-
-
-
-
Search Results
90
records
(took 0.026 seconds)
