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    • 4. 发明授权
    • Amplifier circuit and magnetic sensor
    • 放大电路和磁传感器
    • US07961042B2
    • 2011-06-14
    • US12721755
    • 2010-03-11
    • Toru Takeda
    • Toru Takeda
    • H03F1/02
    • H03F3/005G01R19/0023G01R33/0029G01R33/07H03F3/45475H03F3/45968H03F2200/261H03F2203/45138H03F2203/45528H03F2203/45534
    • An amplifier circuit, includes: a first amplifier; a second amplifier; a first capacitor connected to the first amplifier; a second capacitor having one terminal connected to the first amplifier, another terminal connected to the second input terminal; and a first switch circuit switching a connection of the output terminal, the another terminal of the first capacitor, the first input terminal and the second input terminal, and switching supplying a reference potential supply, the first switch circuit including: a first state connecting the first input terminal to the second input terminal, connecting the output terminal to the another terminal of the first capacitor, and supplying the second input terminal with the reference potential, a second state connecting the first input terminal to the another terminal of the first capacitor and providing the output terminal and the second input terminal in an open state.
    • 一种放大器电路,包括:第一放大器; 第二放大器; 连接到第一放大器的第一电容器; 第二电容器,其一端连接到第一放大器,另一端连接到第二输入端; 以及第一开关电路,其切换所述输出端子,所述第一电容器的另一端子,所述第一输入端子和所述第二输入端子的连接,以及切换提供参考电位电源,所述第一开关电路包括:第一状态, 第一输入端子连接到第二输入端子,将输出端子连接到第一电容器的另一端子,并将第二输入端子提供给参考电位;将第一输入端子连接到第一电容器的另一端子的第二状态;以及 将输出端子和第二输入端子设置在打开状态。
    • 7. 发明申请
    • SIGNAL DETECTING CIRCUIT
    • 信号检测电路
    • US20080197834A1
    • 2008-08-21
    • US12033171
    • 2008-02-19
    • Toru Takeda
    • Toru Takeda
    • G01R1/30H03F1/02
    • G01R1/30H03F1/26H03F2200/271H03F2200/54
    • The signal detecting circuit has a first amplifier which amplifies the supplied signals and outputs the amplified signals from first and second output terminals; a switch unit which supplies the signals to the first amplifier such that the polarity thereof is reversed between the first and second periods; a first capacitor, one end of which is connected to the first output terminal; a second capacitor, one end of which is connected to the second output terminal; a first switch, one end of which is connected to the other end of the second capacitor; a second amplifier having an inverting input terminal connected to the other end of the first capacitor, a non-inverting input terminal connected to the other end of the first switch, and an output terminal; a second switch which is connected to between the output terminal and the inverting input terminal, a third switch, one end of which is connected to the other end of the second capacitor; a fourth switch, one end of which is connected to the other end of the non-inverting input terminal; a threshold voltage source which is connected to between the other end of the third switch and the other end of the fourth switch; and a reference voltage source which is connected to either one of the other end of the third switch and the other end of the fourth switch. In the first period, the first switch is off, and the second to fourth switches are on; in the second period, the first switch is on, and the second to fourth switches are off.
    • 信号检测电路具有第一放大器,放大所提供的信号并从第一和第二输出端输出放大的信号; 开关单元,其将信号提供给第一放大器,使得其极性在第一和第二周期之间相反; 第一电容器,其一端连接到第一输出端子; 第二电容器,其一端连接到第二输出端子; 第一开关,其一端连接到第二电容器的另一端; 第二放大器,其具有连接到第一电容器的另一端的反相输入端子,连接到第一开关的另一端的非反相输入端子和输出端子; 第二开关,其连接到输出端子和反相输入端子之间;第三开关,其一端连接到第二电容器的另一端; 第四开关,其一端连接到非反相输入端子的另一端; 阈值电压源,连接在第三开关的另一端和第四开关的另一端之间; 以及参考电压源,其连接到第三开关的另一端和第四开关的另一端中的任一个。 在第一时段中,第一开关断开,第二至第四开关断开; 在第二时段中,第一开关接通,第二至第四开关断开。
    • 9. 发明申请
    • Optical pickup apparatus and optical reproducing method
    • 光学拾取装置和光学再现方法
    • US20080084801A1
    • 2008-04-10
    • US11907122
    • 2007-10-09
    • Shinzaburo ItoHideo OhkitaHiroaki BentenKenji NagashimaToru Takeda
    • Shinzaburo ItoHideo OhkitaHiroaki BentenKenji NagashimaToru Takeda
    • G11B7/00
    • G11B7/1353G11B7/005G11B7/131G11B7/24088G11B7/246G11B7/2467G11B2007/24624
    • A detection unit of an optical pickup apparatus includes an optical element to simultaneously extract plural specified lights having a different polarization direction respectively in a separated state from light from an optical recording medium, and a light amount measurement unit to simultaneously perform light amount measurement on each of the plural specified lights extracted by the optical element. At the time of reproduction of information, reflected light from the optical recording medium in the case where reproducing light is irradiated, or emission light emitted from the optical recording medium by irradiation of reproducing light is sent to a detection unit. The optical element extracts the plural specified lights having the different polarization direction respectively in the separated state, the light amount measurement unit simultaneously performs the light amount measurement on each of the plural specified lights extracted by the optical element, and the information recorded on the optical recording medium is reproduced from the ratio of light amounts.
    • 光学拾取装置的检测单元包括:光学元件,用于在分离状态下分别从光记录介质中提取具有不同偏振方向的多个指定光;以及光量测量单元,用于同时对每个光量测量 由光学元件提取的多个指定光。 在再现信息时,在再现光照射的情况下来自光学记录介质的反射光或者通过再现光的照射从光学记录介质发射的发射光被发送到检测单元。 光学元件在分离状态下分别提取具有不同偏振方向的多个指定光,光量测量单元同时对由光学元件提取的多个特定光中的每一个进行光量测量,并且记录在光学元件上的信息 从光量的比率再现记录介质。
    • 10. 发明授权
    • Recording apparatus and recording medium
    • 记录装置和记录介质
    • US06614745B1
    • 2003-09-02
    • US09666646
    • 2000-09-20
    • Toru TakedaSatoshi KumaiAyumi KonishiJunichi Suzuki
    • Toru TakedaSatoshi KumaiAyumi KonishiJunichi Suzuki
    • G11B700
    • G11B27/19G11B7/0045G11B7/007G11B7/12G11B27/3027G11B2220/20G11B2220/216
    • There are provided a spindle motor 12, an optical head 20, a high-pass filter 31, low-pass filters 32 and 33, an adder 38, and a PLL 39. The spindle motor 12 rotatively drives an optical disk 11. The optical head 20 irradiates a laser beam onto a target track and both tracks adjacent to the target track on the optical disk 11 and detects a return light from each track. The high-pass filter 31 filters a high-frequency component in a signal used for detecting a return light from a target track in the optical head 20. Each of the low-pass filters 32 and 33 filters a low-frequency component in a signal used for detecting a return light from each of the adjacent tracks. The adder 38 operates output signals from the high-pass filter 31, and the low-pass filters 32 and 33. Based on a signal from the adder 38, the PLL 39 generates a reference signal used as a time reference for generating recording signals. An operation by the adder 38 nullifies a cross modulation component.
    • 设置有主轴电动机12,光头20,高通滤波器31,低通滤波器32和33,加法器38和PLL 39.主轴电机12旋转驱动光盘11.光学 头20将激光束照射在与光盘11上的目标轨道相邻的目标轨道和两个轨道上,并检测来自每个轨道的返回光。 高通滤波器31对用于检测来自光头20中的目标轨道的返回光的信号中的高频分量进行滤波。每个低通滤波器32和33对信号中的低频分量进行滤波 用于检测来自每个相邻轨道的返回光。 加法器38对来自高通滤波器31和低通滤波器32和33的输出信号进行操作。根据来自加法器38的信号,PLL 39产生用作产生记录信号的时间基准的参考信号。 加法器38的操作使交叉调制分量无效。