公开(公告)号：JPH0215429A

公开(公告)日：1990-01-19

申请号：JP16509688

申请日：1988-07-04

Applicant: SONY CORP

Inventor： WACHI SHIGEAKI ,  OKAWA YOSHIHIRO

IPC: G11B7/095

Abstract: PURPOSE:To improve reliability by gradually increasing the gain of a variable gain amplifying circuit while making a control device into a tracking-off condition, and setting the gain of the variable gain control circuit according to a reference level when a detecting signal is detected by means of a comparing circuit. CONSTITUTION:When a traverse signal St outputted from an amplifier 12 becomes larger than a reference voltage Er added to a comparator 15 at a time point t1, a control part 16 detects a detecting signal SD of a comparator output, and sets the gain of the amplifier 12 at a gain G before the stage of the time point t1. At the time of the gain G, since the reference voltage Er is set so that the optimum tracking error signal may be given to a tracking actuator by the gain, when a tracking circuit is turned on at a time point t2, even when the reflectivity of a loaded optical disk is different, the optimum tracking error signal is always supplied to the tracking actuator, and the stable tracking servo can be executed. Thereafter, the tracking error signal obtains an extremely small value, and information writing and reading can be executed with respect to the optical disk.

公开(公告)号：JP2002271362A

公开(公告)日：2002-09-20

申请号：JP2001066755

申请日：2001-03-09

Applicant: SONY CORP

Inventor： OKAWA YOSHIHIRO ,  OGAWA MASATAKA ,  SEKIGUCHI YUJI ,  TAKEDA RITSU ,  FUKUTANI AKITO ,  KUNITO YOSHIYUKI

IPC: H04L12/46 ,  G06F13/00 ,  H04L12/28 ,  H04L12/44 ,  H04L29/06 ,  H04N5/44 ,  H04N7/24 ,  H04N21/41 ,  H04N21/436 ,  H04Q9/00 ,  H04W40/00 ,  H04W84/10 ,  H04W84/12 ,  H04W92/08

Abstract: PROBLEM TO BE SOLVED: To provide a router device which enables connection of an analog device to a network with a simple structure. SOLUTION: Infrared rays corresponding to signals for operating a video recorder 102 are emitted from the router device 101 toward the video recorder 102 in response to the requirements of personal computers 103-106 which are connected to the router device 101. The analog signals which are inputted from the video recorder 102 into the router device 101 according to the operations are converted into digital signals by the router device 101. The converted digital signals are outputted from the router device 101 into the personal computers 103-106 which output sounds and display images.

公开(公告)号：JP2000307520A

公开(公告)日：2000-11-02

申请号：JP11853599

申请日：1999-04-26

Applicant: SONY CORP

Inventor： CHOKAI YOICHI ,  YOSHIDA HIDEKI ,  MOGI TAKAYUKI ,  OKAWA YOSHIHIRO

IPC: H04B10/293 ,  H04B10/07 ,  H04B10/40 ,  H04B10/50 ,  H04B10/564 ,  H04B10/572 ,  H04B10/60 ,  H04B10/14 ,  H04B10/04 ,  H04B10/06 ,  H04B10/26 ,  H04B10/28

Abstract: PROBLEM TO BE SOLVED: To provide an optical transmitter-receiver that can set a correct transmission luminous quantity by adjusting a timing for mutual transmission luminous quantity switching. SOLUTION: The optical transmitter-receiver is provided with an optical transmission section 14 that transmits an optical signal to an opposite party, an optical reception section 15 that receives an optical signal from the opposite party, a signal level detection means 16a that detects a level of the optical signal received by this optical reception section, and a signal level control means 16d switches a transmission luminous quantity of the optical signal by the transmission section on the basis of the signal level detected by the signal level detection means and also with a delay means 16c that delays the switching of the transmission luminous quantity of the optical signal conducted by the signal level control means.

公开(公告)号：JP2000124913A

公开(公告)日：2000-04-28

申请号：JP29578098

申请日：1998-10-16

Applicant: SONY CORP

Inventor： NIWA YOSHIKATSU ,  OKAWA YOSHIHIRO ,  NAKAMURA AKIRA ,  TAKIZUKA HIROSHI ,  FUJIMORI TAKAHIRO

IPC: H04L29/08 ,  G06F13/38 ,  H04L5/14 ,  H04L12/40 ,  H04L12/28

Abstract: PROBLEM TO BE SOLVED: To exactly realize negotiation of speed without caring real operating speed ability. SOLUTION: This interface device is provided with a speed negotiation block 12 for selecting the transfer speed (operating speed) of data, speed signal detecting block 3A for detecting whether data received from the outside are speed signals expressing the transfer speed or not and speed signal transmitting block 3B for transmitting the speed signal based on information received from the speed negotiation block 12. When it is detected by the speed signal detecting block 3A that the operating speed higher than an allowable maximum operating speed is selected, each time negotiation is performed once or plural times, the speed negotiation processing block 12 performs negotiation again after decelerating the maximum operating speed for one step.

公开(公告)号：JPH08203252A

公开(公告)日：1996-08-09

申请号：JP1320695

申请日：1995-01-30

Applicant: SONY CORP

Inventor： OKAWA YOSHIHIRO ,  FUNABASHI TAKESHI

IPC: G11B20/12 ,  G11B27/10

Abstract: PURPOSE: To detect a segment address and a track address from a sector address by a simple operation or in a simple circuit constitution. CONSTITUTION: The method and an apparatus for detecting a segment address and a track address from a sector address are provided. A control part 4 sequentially compares data of a comparison segment count (HSD) with data of a total segment count while gradually multiplying the data HSD by 1/2. When TSD HSD is held, a bit 1 is set to the track address register 10, and at the same time, data of a new total segment count is formed by an operation TSD-HSD. The above operation is carried out in a loop. The final TSD is detected as a segment address. A value finally stored in the track address register 10 is detected as a track address.

公开(公告)号：JPH08203087A

公开(公告)日：1996-08-09

申请号：JP1320495

申请日：1995-01-30

Applicant: SONY CORP

Inventor： OKAWA YOSHIHIRO ,  UEHARA SHUJI

IPC: G11B7/085 ,  G11B7/095

Abstract: PURPOSE: To provide a stable focusing servo by improving the phase margin in a focusing servo loop. CONSTITUTION: A sample servo type magnetooptical disk 5 is used. Consequently, when servo control is conducted intermittently and focusing servo is performed independently at the time of focus searching or seeking, etc., DSP 47 controls a PWM circuit 45 so as to make the output timing of a focusing servo signal earlier than that at the time when tracking servo is performed together with focusing servo.

公开(公告)号：JPH05101413A

公开(公告)日：1993-04-23

申请号：JP28359991

申请日：1991-10-03

Applicant: SONY CORP

Inventor： OKAWA YOSHIHIRO

IPC: G11B7/085 ,  G11B21/08

Abstract: PURPOSE:To stabilize a track jump by detecting the size of an overshoot and controlling the time width or the size of a track jump voltage so as to diminish the overshoot. CONSTITUTION:At an arbitrary time when, for instance, a power source is supplied or an optical disk 1 is changed to another, a track jump voltage VTJ and a control signal S13 are formed by a forming circuit 23 and supplied to a switch circuit 13. The circuit 13 is switched over to the side of the circuit 23 by this signal S13 during this period. Consequently, the voltage VTJ is supplied to an optical pickup 3. As a result, a track jump of the pickup 3 is implemented by the voltage TTJ. As a result, a track error voltage VER is supplied to a detecting circuit 24 to take out a detecting output V24. Then, an AND output voltage V25 from an AND circuit 25 is supplied to the circuit 23. In the circuit 23, a pulse time width for braking the voltage VTJ at the time of the track jump from the next onward is widened.

公开(公告)号：JPH02230515A

公开(公告)日：1990-09-12

申请号：JP5009489

申请日：1989-03-03

Applicant: SONY CORP

Inventor： SHINKAI HIROYUKI ,  WACHI SHIGEAKI ,  TOSAKA SUSUMU ,  OKAWA YOSHIHIRO

IPC: G11B7/00 ,  G11B7/004 ,  G11B7/0045 ,  G11B7/0055 ,  G11B7/085 ,  G11B7/09 ,  G11B7/125 ,  G11B19/04 ,  G11B27/36

Abstract: PURPOSE:To stop the write just prior to becoming a detracking state by monitoring the detracking state of a tracking error signal and the level fluctuation of a focus error signal, which induces a level fluctuation of this tracking error signal, with a defocus detecting means. CONSTITUTION:Both tracking error signal and focus error signal are monitored by a detrack detecting means 10T and a defocus detecting means 10F, and when a signal is outputted to one of these detecting means 10, it is controlled that a recording/erasing mode is cancelled or the optical recording and reproducing device is forcibly changed from its mode to a read mode. Consequently, it is effected that when detracking is incurred during recording or erasing, the laser power can securely be lowered, and an already recorded data is protected, while a data to be recorded is securely be recorded in a prescribed track address.