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    • 3. 发明申请
    • SEMICONDUCTOR DEVICE
    • 半导体器件
    • US20100001315A1
    • 2010-01-07
    • US12473604
    • 2009-05-28
    • Masaaki OKITAKazuyuki SawadaYuji HaradaSaichirou KanekoHiroto Yamagiwa
    • Masaaki OKITAKazuyuki SawadaYuji HaradaSaichirou KanekoHiroto Yamagiwa
    • H01L29/739H01L29/78
    • H01L29/0847H01L29/0634H01L29/0692H01L29/7393H01L29/7835H01L2029/42388H01L2924/0002H01L2924/00
    • A semiconductor device includes a first diffusion region of a second conductivity type formed in an upper portion of a semiconductor substrate of a first conductivity type, a second diffusion region formed in a surface portion of the first diffusion region, a third diffusion region of the second conductivity type formed a predetermined distance spaced apart from the second diffusion region in the surface portion of the semiconductor substrate, a fourth diffusion region of the first conductivity type formed adjacent to the third diffusion region and electrically connected to the third diffusion region, a gate electrode formed on a part between the first diffusion region and the third diffusion region, and an insulating film formed thereon. The impurity concentration of the first diffusion region is set higher than an impurity concentration at which a depletion region extending from an junction interface between the first diffusion region and the semiconductor substrate is formed in a part of the first diffusion region which is between the second diffusion region and the gate electrode when a voltage is applied to the second diffusion region.
    • 半导体器件包括形成在第一导电类型的半导体衬底的上部中的第二导电类型的第一扩散区域,形成在第一扩散区域的表面部分中的第二扩散区域,第二扩散区域的第二扩散区域 在半导体衬底的表面部分形成与第二扩散区间隔开的预定距离的导电类型,与第三扩散区相邻形成并与第三扩散区电连接的第一导电类型的第四扩散区,栅电极 形成在第一扩散区域和第三扩散区域之间的部分上,以及形成在其上的绝缘膜。 将第一扩散区域的杂质浓度设定为高于从第一扩散区域和半导体衬底之间的结界面延伸的耗尽区域形成在第一扩散区域的位于第二扩散区域的部分之间的杂质浓度 区域和栅电极,当电压施加到第二扩散区域时。
    • 5. 发明授权
    • Pickup control device for optical disk drive which adjusts loop gain or determines sample rate
    • 用于光盘驱动器的拾取控制装置,其调节环路增益或确定采样率
    • US06687202B1
    • 2004-02-03
    • US09720547
    • 2001-03-02
    • Takahiro WatanabeYasushi ImamuraMasaaki OkitaYuichi Kobayashi
    • Takahiro WatanabeYasushi ImamuraMasaaki OkitaYuichi Kobayashi
    • G11B700
    • G11B7/0941
    • In an optical disk drive having the structure of rotating an optical disk under the alternative control of CAV or CLV, when the optical disk is rotated under the CLV control, the loop gains for at least one of the focus servo system and the tracking servo system for controlling the operation of the pickup of the optical disk drive are adjusted based on angular velocity detected by an angular velocity detector which is also used for rotating the optical disk under the CAV control, and, when the optical disk is rotated under the CAV control, the loop gains for at least one of the focus servo system and the tracking servo system are adjusted based on linear velocity detected by a linear velocity detector which is also used for rotating the optical disk under CLV control. The above structure enables the effective saving of electricity and cost in the optical disk drive.
    • 在具有在CAV或CLV的替代控制下旋转光盘的结构的光盘驱动器中,当光盘在CLV控制下旋转时,聚焦伺服系统和跟踪伺服系统中的至少一个的环路增益 用于控制光盘驱动器的拾取器的操作基于由CAV控制下也用于旋转光盘的角速度检测器检测的角速度被调整,并且当光盘在CAV控制下旋转时 基于在线速度检测器检测到的线速度来调整聚焦伺服系统和跟踪伺服系统中的至少一个的回路增益,线速度检测器也用于在CLV控制下旋转光盘。 上述结构能够有效节省光盘驱动器中的电力和成本。