公开(公告)号：DE602006011260D1

公开(公告)日：2010-02-04

申请号：DE602006011260

申请日：2006-11-20

Applicant: SONY CORP

Inventor： MORIMOTO TADATSUGU ,  FUJIMOTO TAKASHI ,  HAYASHIDA YOSHIE ,  FUKUDA RUMI ,  KURA JUMPEI ,  YUWAKI TAKESHI

IPC: G11B7/125

Abstract: An optical disk recording apparatus includes an optical pickup (6) that emits laser light to illuminate a recording surface (2A) of an optical disk (2), receives reflected light resulting from the laser light reflected off the recording surface (2A), and generates a light reception signal based on the thus received reflected light; a laser power controller that sets a laser power setting and controls the power of the laser light emitted from the optical pickup based on the thus set laser power setting; and a signal generator (9) that, when a plurality of trial write areas provided on the recording surface of the optical disk are successively illuminated with the laser light in order to write trial write data, generates a timing notification signal that notifies laser arrival timing when the laser light sequentially reaches trial write start positions of the plurality of trial write areas based on the light reception signal generated by the optical pickup (6).

公开(公告)号：JP2002352437A

公开(公告)日：2002-12-06

申请号：JP2001158234

申请日：2001-05-28

Applicant: SONY CORP

Inventor： HAYASHIDA YOSHIE

IPC: G11B7/005

Abstract: PROBLEM TO BE SOLVED: To provide a wobble signal reproducing device and an optical disk apparatus which can deal with a high-speed recording, in which a wobble signal is reproduced properly by reducing the effect of a disk eccentric component. SOLUTION: In the front stage of an operational amplifier 36 which outputs the level-difference between first output signals AIN and DIN and second output signals BIN and CIN, clamp circuits 34A-34D, which mask a signal component at the level greater than the read level component included in the first and the second output signals, and high-pass filters 44A-44D, which have a cut-off frequency higher than the eccentric frequency and lower than the wobble frequency, are provided, thereby the eccentric level is reduced and the output gain of the operational amplifier 36 can be increased. Thus, the wobble signal is reproduced with a high quality.

公开(公告)号：JP2004364012A

公开(公告)日：2004-12-24

申请号：JP2003160732

申请日：2003-06-05

Applicant: Sony Corp ,  ソニー株式会社

Inventor： HAYASHIDA YOSHIE ,  YAMAMOTO YOSHIHIRO

IPC: G11B7/09 ,  H03K5/26

Abstract: PROBLEM TO BE SOLVED: To provide a phase difference detection circuit capable of accurately detecting a phase difference.
SOLUTION: The phase difference detection circuit for detecting the phase difference between first and second input signals includes: a leading edge phase shift direction detection circuit for detecting a phase shift direction between the leading edges of the first and second input signals; a trailing edge phase shift direction detection circuit for detecting a phase shift direction between the trailing edges of the first and second input signals; and a phase difference calculation circuit that calculates the phase difference between the first and second input signals for a period between the leading edges of the first and second input signals on the basis of the phase shift direction detected by the leading edge phase shift direction detection circuit, and calculates the phase difference between the first and second input signals for a period between the trailing edges of the first and second input signals on the basis of the phase shift direction detected by the trailing edge phase shift direction detection circuit.
COPYRIGHT: (C)2005,JPO&NCIPI

公开(公告)号：JP2003132544A

公开(公告)日：2003-05-09

申请号：JP2001323868

申请日：2001-10-22

Applicant: SONY CORP

Inventor： HAYASHIDA YOSHIE

IPC: G11B7/0045 ,  G11B7/125

Abstract: PROBLEM TO BE SOLVED: To make the start quick after buffer under-run errors are eliminated. SOLUTION: This circuit makes the recording power constant by inputting the detected output matching the light amount of the laser diode. It has a low frequency amplifier 49 to determine the response of the control loop to control the laser power, and this amplifier consists of a differential amplifier 47 and a low-pass filter 48 to maintain the output voltage of the differential amplifier at the same value (target value) as the one immediately before a buffer under- run error happens when there is no data to write. Since the laser power control voltage is supplied to the laser driver without changing when writing data and when there is a buffer under-run error, the laser power control voltage rises quickly to the target voltage even when starting again to write the data, and the waiting time is shortened before the start of data recording. Besides, the recording capacity is secured for the optical disk.

公开(公告)号：JP2007157222A

公开(公告)日：2007-06-21

申请号：JP2005349362

申请日：2005-12-02

Applicant: Sony Corp ,  ソニー株式会社

Inventor： MORIMOTO TADATSUGU ,  FUJIMOTO TAKASHI ,  HAYASHIDA YOSHIE ,  FUKUDA RUMI ,  KURA JUNPEI ,  YUWAKI TAKESHI

IPC: G11B7/0045 ,  G11B7/09

CPC classification number: G11B7/1267

Abstract: PROBLEM TO BE SOLVED: To write test-write data using respectively and effectively individual test-write region. SOLUTION: When test-write data are written continuously in a plurality of test-write regions 23 provided in a recording plane 2A of an optical disk 2, a timing notification signal CL notifying laser arrival timing at which laser beams L1 reach successively a test-write start position of the plurality of test-write regions 23 is generated based on a light receiving signal obtained from an optical pickup part 6, when the laser arrival timing is notified by the timing notification signal CL, an own laser intensity setting value is switched and set, and intensity of the laser beam L1 emitted from the optical pickup part 6 is controlled. Thereby, intensity of the laser beam L1 is switched in laser arrival timing at which respective laser beams L1 reach the test-write start positions of a plurality of test-write regions 23 and test-write can be performed, test-write data can be written using effectively individual test-write region. COPYRIGHT: (C)2007,JPO&INPIT

Abstract translation: 要解决的问题：使用分别有效的单个测试写入区域来写入测试写入数据。 解决方案：当测试写入数据被连续地写入设置在光盘2的记录平面2A中的多个测试写入区域23中时，通知激光束L1到达激光器到达定时的定时通知信号CL 基于从光学拾取部分6获得的光接收信号，当定时通知信号CL通知激光到达定时时，产生多个测试写入区域23的测试写入开始位置，自身的激光强度设定 值被切换和设置，并且控制从光拾取部分6发射的激光束L1的强度。 由此，激光束L1的强度在各激光束L1达到多个测试写入区域23的测试写入开始位置的激光到达定时被切换，并且可以执行测试写入数据 使用有效的单个测试写入区域写入。 版权所有（C）2007，JPO＆INPIT

公开(公告)号：JP2004362691A

公开(公告)日：2004-12-24

申请号：JP2003160726

申请日：2003-06-05

Applicant: Sony Corp ,  ソニー株式会社

Inventor： HAYASHIDA YOSHIE ,  YAMAMOTO YOSHIHIRO

IPC: G11B7/09

Abstract: PROBLEM TO BE SOLVED: To provide a phase difference detection circuit capable of accurately detecting a phase difference.
SOLUTION: This phase difference detection circuit is provided with a phase shift direction detection circuit for detecting a phase shift direction between first and second input signals, and a phase difference calculation circuit for calculating a phase difference between the first and second input signals on the basis of the phase shift direction detected by the phase shift direction detection circuit. The phase shift direction detection circuit is provided with a waveform shaping circuit for shaping the waveforms of the first or second input signal before the phase shift direction is detected.
COPYRIGHT: (C)2005,JPO&NCIPI

公开(公告)号：JP2004362651A

公开(公告)日：2004-12-24

申请号：JP2003158283

申请日：2003-06-03

Applicant: Sony Corp ,  ソニー株式会社

Inventor： HAYASHIDA YOSHIE

IPC: G11C27/02 ,  G11B7/0045 ,  G11B7/125

Abstract: PROBLEM TO BE SOLVED: To provide a sample holding circuit not affected by noise contained in an input signal, a pit level detection circuit capable of detecting an accurate pit level, and an optical disk recording/reproducing device capable of executing accurate writing by performing accurate running OPC. SOLUTION: The sample holding circuit having a holding capacitor for holding a sampled input signal is provided with a response time shortening circuit for shortening the delay of response time caused by the holding capacitor and input resistance. COPYRIGHT: (C)2005,JPO&NCIPI

公开(公告)号：JP2003257034A

公开(公告)日：2003-09-12

申请号：JP2002059459

申请日：2002-03-05

Applicant: SONY CORP

Inventor： AKABOSHI HIROYUKI ,  HAYASHIDA YOSHIE

IPC: G11B20/10 ,  G11B7/0045

Abstract: PROBLEM TO BE SOLVED: To provide a wobble signal extracting circuit and an optical disk recording/playing-back device which are coped with the high speed write-in, by reducing the noise component contained in wobble signal components. SOLUTION: In the wobble signal extracting circuit for extracting the wobble component during the recording operation from the optical disk whereon the wobble is formed in a guide groove, a 2nd sample-and-hold circuit 15 for sampling a write level signal is provided in parallel with a 1st sample-and-hold circuit 14 for sampling a read level signal, and output signals of these two sample-and-hold circuits are added by an adder 24 to extract the wobble signal component corresponding to the wobble formed in the guide groove in accordance with an output of the adder 24. By this procedure, since the wobble signal components having the same phase are simply added and the noise components having not the same phase are averaged, the ratio of the noise components to the wobble signal components is decreased. COPYRIGHT: (C)2003,JPO