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    • 5. 发明授权
    • Speaker unit
    • 扬声器单元
    • US08687838B2
    • 2014-04-01
    • US13255754
    • 2010-03-10
    • Akihito MitsuiShinichi Yamada
    • Akihito MitsuiShinichi Yamada
    • H04R1/00
    • H04R1/005H04R7/04H04R2307/023
    • A speaker unit is realized which directly drives a vibration plate having a low density, light weight, yet sufficient rigidity with a digital audio signal, and can thereby transmit vibration of a voice coil thereof to a carbonaceous acoustic vibration plate without loss. The present invention provides a digital speaker unit including a speaker body (14) comprising a carbonaceous acoustic vibration plate (25), a delta-sigma modulator (11) and a thermometer code conversion section (12) that convert a multi-value bit digital audio signal supplied from a digital sound source (10) to a digital signal with required bits, a plurality of voice coils (24) that cause to vibrate a plurality of the carbonaceous acoustic vibration plates (25) provided in accordance with the number of digital signal bits and a driver circuit (13) that individually drives each voice coil (24) based on the digital signal.
    • 实现了一种扬声器单元,其直接驱动具有低密度,轻重量,并且具有数字音频信号的足够刚性的振动板,并且因此可以将其音圈的振动传输到碳质振动振动板而没有损失。 本发明提供了一种数字扬声器单元,包括扬声器主体(14),包括碳质振动板(25),Δ-Σ调制器(11)和温度计代码转换部分(12),其转换多值位数字 音频信号从数字声源(10)提供到具有所需位的数字信号;多个音圈(24),其使得根据数字的数量提供的多个碳质振动板(25)振动; 信号位和驱动电路(13),其根据数字信号分别驱动每个音圈(24)。
    • 6. 发明申请
    • SPEAKER UNIT
    • 扬声器单元
    • US20120033837A1
    • 2012-02-09
    • US13255754
    • 2010-03-10
    • Akihito MitsuiShinichi Yamada
    • Akihito MitsuiShinichi Yamada
    • H04R1/00
    • H04R1/005H04R7/04H04R2307/023
    • A speaker unit is realized which directly drives a vibration plate having a low density, light weight, yet sufficient rigidity with a digital audio signal, and can thereby transmit vibration of a voice coil thereof to a carbonaceous acoustic vibration plate without loss. The present invention provides a digital speaker unit including a speaker body (14) comprising a carbonaceous acoustic vibration plate (25), a delta-sigma modulator (11) and a thermometer code conversion section (12) that convert a multi-value bit digital audio signal supplied from a digital sound source (10) to a digital signal with required bits, a plurality of voice coils (24) that cause to vibrate a plurality of the carbonaceous acoustic vibration plates (25) provided in accordance with the number of digital signal bits and a driver circuit (13) that individually drives each voice coil (24) based on the digital signal.
    • 实现了一种扬声器单元,其直接驱动具有低密度,轻重量,并且具有数字音频信号的足够刚性的振动板,并且因此可以将其音圈的振动传输到碳质振动振动板而没有损失。 本发明提供了一种数字扬声器单元,包括扬声器主体(14),包括碳质振动板(25),Δ-Σ调制器(11)和温度计代码转换部分(12),其转换多值位数字 音频信号从数字声源(10)提供到具有所需位的数字信号;多个音圈(24),其使得根据数字的数量提供的多个碳质振动板(25)振动; 信号位和驱动电路(13),其根据数字信号分别驱动每个音圈(24)。
    • 8. 发明授权
    • Optical disc device
    • 光盘设备
    • US08098556B2
    • 2012-01-17
    • US12297483
    • 2007-04-20
    • Yuuichi KuzeKatsuya WatanabeShinichi Yamada
    • Yuuichi KuzeKatsuya WatanabeShinichi Yamada
    • G11B15/62G11B17/32G11B20/20G11B27/10G11B20/10
    • G11B7/0945G11B7/0956
    • An object of this invention is to measure the tilt quantity of, and perform a tilt control on, an optical disc accurately without depending on the rotation control method.An optical disc drive includes: a motor for rotating an optical disc; an optical system for irradiating the optical disc with a light beam; a moving mechanism for moving the optical system along the radius of the optical disc; a focus control section for controlling movement of the optical system perpendicularly to the optical disc based on drive values, thereby focusing the light beam onto a storage layer of the optical disc; and a tilt control section for measuring the tilt quantities of the storage layer at multiple different radial locations on the optical disc based on drive values for the respective radial locations when the focus control section focuses the light beam there. When the tilt control section measures the tilt quantities, the motor keeps the rotational frequency of the optical disc constant and the tilt control section uses the drive values obtained at the respective radial locations.
    • 本发明的目的是在不依赖于旋转控制方法的情况下精确地测量光盘的倾斜量并进行倾斜控制。 光盘驱动器包括:用于旋转光盘的马达; 用于用光束照射光盘的光学系统; 用于沿光盘的半径移动光学系统的移动机构; 焦点控制部分,用于基于驱动值来控制光学系统垂直于光盘的移动,从而将光束聚焦到光盘的存储层上; 以及倾斜控制部,用于当聚焦控制部将光束聚焦在那里时,基于各个径向位置的驱动值来测量光盘上的多个不同径向位置处的存储层的倾斜量。 当倾斜控制部分测量倾斜量时,马达保持光盘的旋转频率恒定,并且倾斜控制部分使用在各个径向位置处获得的驱动值。