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公开(公告)号：JPH04355202A
公开(公告)日：1992-12-09
申请号：JP13003891
申请日：1991-05-31
Applicant: SONY CORP
Inventor： KAWASHIMA TETSUJI , WACHI SHIGEAKI , OGAWA MASATAKA , NAKAMURA MASANOBU
IPC: G11B5/02 , G11B11/10 , G11B11/105
Abstract: PURPOSE:To easily detect a signal indicating the operation state of a circuit including a magnetic head. CONSTITUTION:Coils 10a and 10b of a magnetic head 10 in an magnetooptical disk drive device, and a current detection coil 50 detecting current to be supplied to a magnetic detection coil 20 or the magnetic head 10 arranged in a electromagnetic coupling sate in non-contact provided. And a detection signal So indicating the operation state at the time of writing with the magnetic head 10 is obtained from the coil 50.
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公开(公告)号：JPH0469802A
公开(公告)日：1992-03-05
申请号：JP18156090
申请日：1990-07-11
Applicant: SONY CORP
Inventor： CHICHI SHIGEAKI , KAWASHIMA TETSUJI
IPC: G11B11/10 , G11B5/00 , G11B5/02 , G11B11/105
Abstract: PURPOSE:To prevent the variance of a magnetic field due to the temperature variance by providing a means, which sets the bias voltage of a switching element so that the supply current in a test write area is a prescribed value, and a data input circuit for on/off control based on recording data. CONSTITUTION:Voltages at points A, and A2, namely, values of exciting currents are compared with a reference voltage V2 by comparators 21A and 21B, and difference signals are held in sampling and holding circuits 22A and 22B. Since output voltages of circuits 22A and 22B pass buffer amplifiers 23A and 23B to become the gate electrode potentials of switching elements Q1 and Q2, exciting currents are always kept constant by a bias voltage setting circuit 20A. Consequently, the variance of exciting currents due to the temperature rise of magnetic modulation coils L1 and L2 and the temperature characteristics of elements Q1 and Q2 is corrected in the test write area. The voltage V2 is so set that a prescribed magnetic field is obtained in the case of a dot mark where the code length of recording data is shortest. Thus, the variance of the magnetic field and overheating of magnetic modulation coils are prevented.
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公开(公告)号：JPH03171453A
公开(公告)日：1991-07-24
申请号：JP31035389
申请日：1989-11-29
Applicant: SONY CORP
Inventor： WATANABE SATORU , YAMAGAMI TAMOTSU , KAWASHIMA TETSUJI
IPC: G11B11/10 , G11B11/105 , G11B20/10
Abstract: PURPOSE:To enable the stable reproducing of data against a level fluctuation of a magneto-optical signal by controlling a reference level in accordance with a level of a common mode signal component to be obtained from an optical pickup. CONSTITUTION:The magneto-optical signal supplied to a data reproducing circuit 22 is delayed by a delay circuit 23 and subtracted from the original magneto-optical signal by an adder 24 to obtain the difference for each clock, and this difference output is sent to a comparator 25 to discriminate its level with a reference level from a reference level deciding circuit 32 as a threshold value, so as to obtain a binarized output. This binarized output is sent to a decoder 26 for performing a demodulation processing and a decoding processing, etc., to carry out the reproducing of a recording information data. This reference level is decided in accordance with a level (b) of the common mode signal component, so that a discriminated reference level is changed at the time of binarization of the data reproducing. By this method, the reproducing of data is stably feasible against fluctuation in level with simple constitution.
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公开(公告)号：JP2008251161A
公开(公告)日：2008-10-16
申请号：JP2008150893
申请日：2008-06-09
Inventor： KAWASHIMA TETSUJI , SHISHIDO YUKIO , KAWAKAMI HIROO
IPC: G11B20/12 , G11B7/0045 , G11B7/007 , G11B20/10 , G11B27/00
Abstract: PROBLEM TO BE SOLVED: To improve interchangeability and operability in using a recordable multi-layer disk. SOLUTION: A region for recording interlayer folding back position information is set on a recording medium (e.g., End sector number in Layer 0 or a session item type 3). In response to a fact that recording on a certain recording layer reaches a maximum recording range or that data recording advances from a certain recording layer to a next recording layer, interlayer folding back position information is recorded in the recording medium. When an advancement of the data recording to another recording layer is performed at a stage prior to disk closing or sector closing, or when it is predicted that such an advancement of the data recording occurs afterwards, the interlayer folding back position information is recorded. Also where the disk is of the type for which multi-session recording is performed, the interlayer return position information is recorded with regard to a session in which folding back is performed. COPYRIGHT: (C)2009,JPO&INPIT
Abstract translation: 要解决的问题：提高使用可记录多层盘的互换性和可操作性。 解决方案：用于记录层间折叠位置信息的区域设置在记录介质上（例如，层0中的结束扇区号或会话项类型3）。 响应于在某个记录层上的记录达到最大记录范围或数据记录从某个记录层前进到下一个记录层的事实，层间折叠位置信息被记录在记录介质中。 当在盘关闭或扇区关闭之前的阶段执行数据记录到另一个记录层的进行时，或者当预测数据记录的这种进行发生之后，记录层间折叠位置信息。 此外，在盘被执行多次会话记录的类型中，对于执行折页的会话记录了层间返回位置信息。 版权所有（C）2009，JPO＆INPIT
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公开(公告)号：JP2002311976A
公开(公告)日：2002-10-25
申请号：JP2001117106
申请日：2001-04-16
Applicant: SONY CORP
Inventor： KAWASHIMA TETSUJI , SHISHIDO YUKIO , YOKU KOJI
Abstract: PROBLEM TO BE SOLVED: To easily carry out processing based on detected additional information embedded in contents data while reducing the load of hardware. SOLUTION: The additional information embedded in the contents is detected from data near the head portion of a prescribed amount of contents data. The contents of the detected additional information are judged, and a prescribed amount of the contents data is recorded on a prescribed medium when judged as recordable contents data. Recording is not carried out on the medium when judged as contents data whose recording is prohibited.
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Patent Agency Ranking
公开(公告)号：JP2002032922A
公开(公告)日：2002-01-31
申请号：JP2001132156
申请日：2001-04-27
Applicant: SONY CORP
Inventor： KAWASHIMA TETSUJI , SHISHIDO YUKIO , TSUKADA HIROSHI , MIYAKE KUNIHIKO
Abstract: PROBLEM TO BE SOLVED: To actualize speedy access operation by easily calculating the movement quantity of an optical head even whichever storage area the optical head is made to access. SOLUTION: Physical addresses on a disk surface which are represented in 1st format as time-axis information and 2nd format as a binary format are so set as to monotonously increase from the inner peripheral side to the outer peripheral side of the disk while made to correspond to each other one to one between the 1st and 2nd formats over the entire area of the recording area.
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公开(公告)号：JP2001344755A
公开(公告)日：2001-12-14
申请号：JP2001083583
申请日：2001-03-22
Applicant: SONY CORP
Inventor： MIYAKE KUNIHIKO , IIDA MICHIHIKO , KAWASHIMA TETSUJI , NAGASHIMA KENJI , KUMAGAI EIJI
IPC: G11B7/0045
Abstract: PROBLEM TO BE SOLVED: To perform stable and reliable recording to an optical recording medium corresponding to high recording density. SOLUTION: In the case of performing a recording operation to an optical disk 1, a wobble signal (ATIP signal) recorded in the pre-groove 5 is detected and whether the disc is a conventional optical disk or an optical disk of high recording density is discriminated by an ATIP decoder 16. In accordance with the result of this discrimination, a control part 20 controls each part to regulate both end positions of a radial direction in at last one of a read-in area, a program area and a read-out area for writing by an optical pickup 13.
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公开(公告)号：JP2001266493A
公开(公告)日：2001-09-28
申请号：JP2000087123
申请日：2000-03-23
Applicant: SONY CORP
Inventor： KAWASHIMA TETSUJI
Abstract: PROBLEM TO BE SOLVED: To discriminate the kind of optical disk. SOLUTION: In the unit for recording and/or reproducing an information signal to an optical disk 101, on which the information signal is recorded along a recording track, for using a specified pattern as the synchronizing signal of this information signal, this unit has a disk identifying part 70 for identifying the kind of optical disk 101 from a relevant patter selected out of plural kinds of selectable patterns and recorded.
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公开(公告)号：JP2001266353A
公开(公告)日：2001-09-28
申请号：JP2000087124
申请日：2000-03-23
Applicant: SONY CORP
Inventor： KAWASHIMA TETSUJI , KUMAGAI EIJI
IPC: G11B20/10 , G11B7/0045
Abstract: PROBLEM TO BE SOLVED: To increase the recording density. SOLUTION: An optical disk 101 is used, such that data are recorded by a pattern corresponding to a run while using the RLL(run length limited) encoding having the limited length of run and reproduced by correcting a pattern having the length shorter than that of the shortest pattern to the shortest pattern, and by an EFM(eight-to-fourteen modulation) equalizer 12 of a digital processing part 4, when the EFM signal inputted from an EFM/CIRC(cross interleave Reed-Solomoncode) encoding/decoding part 51 is converted to a writing signal, the control is made so as to record along a recording track of the optical disk 101 by reducing the length of the pattern corresponding to the shortest run.
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公开(公告)号：JP2001167561A
公开(公告)日：2001-06-22
申请号：JP2000299129
申请日：2000-09-29
Applicant: SONY CORP
Inventor： SHISHIDO YUKIO , KAWASHIMA TETSUJI , SAKO YOICHIRO , INOGUCHI TATSUYA , TOYAMA KATSUMI , TSUKATANI SHIGEKI
Abstract: PROBLEM TO BE SOLVED: To express the absolute time that can correspond to a large-capacity optical disk, etc., and to easily discriminate the type of the optical disk. SOLUTION: An absolute time area is extended by means of a comparatively unimportant area such as a zero data area and/or a relative time area included in a Q channel contained in a subcode of a CD recording format. Concretely an absolute time is expressed by performing the BCD expression of the digits of '100 minutes' by means of lower 4 bits included in an 8-bit zero data area ZERO. Thus, the absolute times covering up to the largest 999 minutes 59 seconds 74 frame can be expressed. Meanwhile, the identification information showing an optical disk of large capacity and high density, for example, can be expressed by means of higher 4 bits included in the area ZERO.
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