公开(公告)号：US07869325B2

公开(公告)日：2011-01-11

申请号：US11937277

申请日：2007-11-08

申请人： Tadafumi Yoshimoto

发明人： Tadafumi Yoshimoto

IPC分类号： G11B7/00

CPC分类号： G11B7/094

摘要： While reproducing information on an optical disc, an optical disc apparatus varies a focus balance value in both positive and negative directions from a currently set value thereof by ±a which will not affect reproduction operation, measures jitter levels c and d of a reproduced signal when the focus balance value is varied in the positive and negative directions, and calculates a difference e=c−d between the measured jitter levels. If this difference e exceeds a threshold value f, the optical disc apparatus varies the focus balance value by a specified amount g in a direction in which the difference e approaches 0, thereby updating the current focus balance value.

摘要翻译： 当在光盘上再现信息时，光盘装置从其当前设定的值向正，负方向的聚焦平衡值改变不会影响再现操作的±a，测量再现信号的抖动水平c和d， 焦距平衡值在正和负方向上变化，并且计算测量的抖动水平之间的差e = c-d。 如果该差值e超过阈值f，则光盘装置将差分e接近0的方向将聚焦平衡值改变指定量g，从而更新当前焦点平衡值。

公开(公告)号：US08203915B2

公开(公告)日：2012-06-19

申请号：US12705122

申请日：2010-02-12

申请人： Tadafumi Yoshimoto

发明人： Tadafumi Yoshimoto

IPC分类号： G11B7/085 ,  G11B7/00

CPC分类号： G11B7/08523 ,  G11B7/0945

摘要： An optical disc reader comprising a controller that controls a read operation to read data recorded on an optical disc and a counter that counts the number of zero crossings in a tracking error signal. Between the completion of focusing operation and the start of tracking operation, the controller determines whether or not the light beam is properly focused on a data recording layer in the optical disc based on the number of zero crossings in the tracking error signal counted by the counter. If it is determined that the light beam is not properly focused, the controller causes the focusing operation to be performed again. Otherwise, if it is determined that the light beam is properly focused on the data recording layer, the controller causes the tracking operation to be performed and then starts the read operation.

摘要翻译： 一种光盘读取器，包括控制读取操作以读取记录在光盘上的数据的控制器和对跟踪误差信号中的过零数进行计数的计数器。 在聚焦操作完成和跟踪操作开始之间，控制器基于由计数器计数的跟踪误差信号中的过零次数，确定光束是否适当地聚焦在光盘中的数据记录层上 。 如果确定光束未被适当地聚焦，则控制器使得再次执行聚焦操作。 否则，如果确定光束适当地聚焦在数据记录层上，则控制器执行跟踪操作，然后开始读取操作。

公开(公告)号：US20090161511A1

公开(公告)日：2009-06-25

申请号：US12314235

申请日：2008-12-05

申请人： Tadafumi Yoshimoto

发明人： Tadafumi Yoshimoto

IPC分类号： G06F7/00

CPC分类号： G11B19/12 ,  G11B2007/0006

摘要： A detection signal is asserted when a surface of an optical disc or an information recording layer is detected. An asserting (masking) time interval of the detection signal is set such that the number of times of asserting the detection signal becomes at most two times when a focal position of the objective lens passes at least the surface of the optical disc. After the objective lens is moved for a prescribed section in a direction along which the objective lens comes closer to the optical disc, a kind of the optical disc is discriminated based on a time interval T1 from a first beginning of assertion to a second beginning of assertion, if the number of times of asserting the detection signal is two times, or based on a time interval which is a longer time interval between the time interval T1 from the first beginning of assertion to the second beginning of assertion and a time interval T2 from the second beginning of assertion to a third beginning of assertion if the number of times of asserting the detection signal is more than two times.

摘要翻译： 当检测到光盘或信息记录层的表面时，检测信号被断言。 设置检测信号的断言（屏蔽）时间间隔，使得当物镜的焦点位置至少通过光盘的表面时，使检测信号的断言次数最多为两次。 在物镜沿着物镜靠近光盘的方向移动规定部分之后，根据从断言的第一开始到第二开始的时间间隔T1来辨别光盘的种类 断言，如果确定检测信号的次数是两次，或者基于从从断言的第一次开始到第二次断言的时间间隔T1之间的较长时间间隔的时间间隔和时间间隔T2 如果断言检测信号的次数多于两次，则从断言的第二个开始到第三个断言开始。

公开(公告)号：US20080130451A1

公开(公告)日：2008-06-05

申请号：US11937277

申请日：2007-11-08

申请人： Tadafumi Yoshimoto

发明人： Tadafumi Yoshimoto

IPC分类号： G11B5/58

CPC分类号： G11B7/094

摘要： While reproducing information on an optical disc, an optical disc apparatus varies a focus balance value in both positive and negative directions from a currently set value thereof by ±a which will not affect reproduction operation, measures jitter levels c and d of a reproduced signal when the focus balance value is varied in the positive and negative directions, and calculates a difference e=c−d between the measured jitter levels. If this difference e exceeds a threshold value f, the optical disc apparatus varies the focus balance value by a specified amount g in a direction in which the difference e approaches 0, thereby updating the current focus balance value.

摘要翻译： 当在光盘上再现信息时，光盘装置从其当前设定的值向正，负方向的聚焦平衡值改变不会影响再现操作的±a，测量再现信号的抖动水平c和d， 焦距平衡值在正和负方向上变化，并且计算测量的抖动水平之间的差e = cd。 如果该差值e超过阈值f，则光盘装置将差分e接近0的方向将聚焦平衡值改变指定量g，从而更新当前焦点平衡值。

公开(公告)号：US07961576B2

公开(公告)日：2011-06-14

申请号：US12314235

申请日：2008-12-05

申请人： Tadafumi Yoshimoto

发明人： Tadafumi Yoshimoto

IPC分类号： G11B7/00

CPC分类号： G11B19/12 ,  G11B2007/0006

摘要： A detection signal is asserted when a surface of an optical disc or an information recording layer is detected. An asserting (masking) time interval of the detection signal is set such that the number of times of asserting the detection signal becomes at most two times when a focal position of the objective lens passes at least the surface of the optical disc. After the objective lens is moved for a prescribed section in a direction along which the objective lens comes closer to the optical disc, a kind of the optical disc is discriminated based on a time interval T1 from a first beginning of assertion to a second beginning of assertion, if the number of times of asserting the detection signal is two times, or based on a time interval which is a longer time interval between the time interval T1 from the first beginning of assertion to the second beginning of assertion and a time interval T2 from the second beginning of assertion to a third beginning of assertion if the number of times of asserting the detection signal is more than two times.

摘要翻译： 当检测到光盘或信息记录层的表面时，检测信号被断言。 设置检测信号的断言（屏蔽）时间间隔，使得当物镜的焦点位置至少通过光盘的表面时，使检测信号的断言次数最多为两次。 在物镜沿着物镜靠近光盘的方向移动规定部分之后，根据从断言的第一开始到第二开始的时间间隔T1来辨别光盘的种类 断言，如果确定检测信号的次数是两次，或者基于从从断言的第一次开始到第二次断言的时间间隔T1之间的较长时间间隔的时间间隔和时间间隔T2 如果断言检测信号的次数多于两次，则从断言的第二个开始到第三个断言开始。

公开(公告)号：US07936654B2

公开(公告)日：2011-05-03

申请号：US12188299

申请日：2008-08-08

申请人： Tadafumi Yoshimoto

发明人： Tadafumi Yoshimoto

IPC分类号： G11B20/18

CPC分类号： G11B7/0945 ,  G11B19/12 ,  G11B2007/0006

摘要： An optical disk device includes an optical pickup, a focus drive section, a detection section, a time measurement section and a disk identification section. The detection section detects reflected light reflected from an optical disk while the focus drive section moves a focus position of the optical pickup. The time measurement section measures a focus search time between when the reflected light reflected from a disk surface of the optical disk is detected and when the reflected light reflected from an information recording layer of the optical disk is detected. The time measurement section measures a false reflection search time between when the reflected light reflected from the disk surface is detected and when false reflection light is detected. The disk identification section calculates a ratio of the focus search time to the false reflection search time, and identifies a type of the optical disk based on the ratio.

摘要翻译： 光盘装置包括光学拾取器，聚焦驱动部分，检测部分，时间测量部分和盘识别部分。 当聚焦驱动部移动光学拾取器的聚焦位置时，检测部分检测从光盘反射的反射光。 时间测量部分测量检测到从光盘的盘表面反射的反射光与检测到从光盘的信息记录层反射的反射光之间的聚焦搜索时间。 时间测量部分测量检测到从盘表面反射的反射光与检测到假反射光时的假反射搜索时间。 盘识别部分计算焦点搜索时间与假反射搜索时间的比率，并且基于该比率来识别光盘的类型。

公开(公告)号：US07768883B2

公开(公告)日：2010-08-03

申请号：US11927843

申请日：2007-10-30

申请人： Tadafumi Yoshimoto

发明人： Tadafumi Yoshimoto

IPC分类号： G11B7/00

CPC分类号： G11B7/1263 ,  G11B7/0945 ,  G11B7/0956

摘要： An optical disk device includes an optical pickup, a measurement unit and a control unit. The optical pickup is configured to emit laser light to a disk to record data. The measurement unit is operatively coupled to the optical pickup to measure a peak value of a RF signal outputted from the optical pickup, a fluctuation amplitude of the peak value of the RF signal and an amplitude of the focus drive signal of the optical pickup. The control unit is operatively coupled to the measurement unit to correct the peak value of the RF signal measured during a second recording based on the fluctuation amplitude of the peak value of the RF signal and the amplitude of the focus drive signal measured during a first recording prior to the second recording.

摘要翻译： 光盘装置包括光学拾取器，测量单元和控制单元。 光拾取器被配置为向盘发射激光以记录数据。 测量单元可操作地耦合到光学拾取器，以测量从光学拾取器输出的RF信号的峰值，RF信号的峰值的波动幅度和光学拾取器的聚焦驱动信号的幅度。 控制单元可操作地耦合到测量单元，以基于RF信号的峰值的波动幅度和在第一记录期间测量的聚焦驱动信号的振幅来校正在第二记录期间测量的RF信号的峰值 在第二次录制之前。

公开(公告)号：US07483347B2

公开(公告)日：2009-01-27

申请号：US11211470

申请日：2005-08-26

申请人： Tadafumi Yoshimoto

发明人： Tadafumi Yoshimoto

IPC分类号： G11B7/00

CPC分类号： G11B7/0956

摘要： An optical disk apparatus detects a predetermined tilt angle and a predetermined focus bias at least two detection points on an inner and an outer circumferences of the optical disk. On the basis of the predetermined tilt angle detected at the detection points, the apparatus estimates the predetermined tilt angle at a radial position of the optical disk, and also estimates a focus bias. The apparatus controls the tilt angle according to a radial position of target track and a focus bias on the basis of estimation results at the time of recording and reading data on the optical disk.

摘要翻译： 光盘装置在光盘的内周和外周上检测到预定的倾斜角度和预定的聚焦偏压至少两个检测点。 基于在检测点处检测到的预定倾斜角度，该装置估计光盘的径向位置处的预定倾斜角度，并估计聚焦偏压。 该装置根据在光盘上记录和读取数据时的估计结果，根据目标轨道的径向位置和聚焦偏压来控制倾斜角。

公开(公告)号：US07190645B2

公开(公告)日：2007-03-13

申请号：US10361031

申请日：2003-02-10

申请人： Tadafumi Yoshimoto

发明人： Tadafumi Yoshimoto

IPC分类号： G11B7/095

CPC分类号： G11B7/0945 ,  G11B7/0956

摘要： At the initialization, a tilt mechanism 9 is activated in a state where an optical pick-up 3 is fixed, and set up at a position where an E-F phase difference obtained in a signal processing portion 4 is 180°. Thereafter, a reproducing operation is started. During the reproducing operation, the tilt mechanism 9 is not activated and the focus control is made with the focus servo by moving the optical pick-up 3 up or down, while the level of a focus error signal is within a certain range. Further, if the level of focus error signal is beyond the certain range because the optical disk 1 is greatly inclined, the tilt mechanism 9 is activated to cause the optical disk 1 to come closer to the optical pick-up 3 to enable the control of the focus servo.

摘要翻译： 在初始化时，倾斜机构9在光学拾取器3固定的状态下被激活，并且被设置在信号处理部分4中获得的E-F相位差为180°的位置处。 此后，开始再现操作。 在再现操作期间，倾斜机构9不被激活，并且通过在光学拾取器3上升或下降的同时通过聚焦伺服进行聚焦控制，同时聚焦误差信号的电平在一定范围内。 此外，如果由于光盘1大大倾斜，聚焦误差信号的水平超出了一定范围，则倾斜机构9被激活，使得光盘1靠近光学拾取器3，从而能够控制 聚焦伺服。

公开(公告)号：US20060062123A1

公开(公告)日：2006-03-23

申请号：US11211470

申请日：2005-08-26

申请人： Tadafumi Yoshimoto

发明人： Tadafumi Yoshimoto

IPC分类号： G11B7/00

CPC分类号： G11B7/0956

摘要： An optical disk apparatus detects a predetermined tilt angle and a predetermined focus bias at least two detection points on an inner and an outer circumferences of the optical disk. On the basis of the predetermined tilt angle detected at the detection points, the apparatus estimates the predetermined tilt angle at a radial position of the optical disk, and also estimates a focus bias. The apparatus controls the tilt angle according to a radial position of target track and a focus bias on the basis of estimation results at the time of recording and reading data on the optical disk.