Optical transmitter
    23.
    发明授权
    Optical transmitter 有权
    光发射机

    公开(公告)号:US07298977B2

    公开(公告)日:2007-11-20

    申请号:US10496687

    申请日:2002-11-28

    CPC分类号: H04B10/504

    摘要: The present invention is intended to prevent a light-emitting diode from emitting light continuously in the case when the level at an input terminal is fixed high because of software or the like and to avoid various problems, such as battery exhaustion and breakdown of the light-emitting diode, in PDAs, cellular phones, etc. For these purposes, a high-pass filter 21 for passing the high-frequency components of an optical transmission input signal having a pulse waveform and a binary circuit 22 for binarizing the output signal of the high-pass filter 21 so as to be returned to a pulse waveform are provided in the preceding stage of a light-emitting device driving circuit 23 for driving a light-emitting diode 8 for optical transmission.

    摘要翻译: 本发明是为了防止发光二极管由于软件等而在输入端子的电平固定为高的情况下连续地发光,并且避免诸如电池耗尽和光的破坏等各种问题 用于PDA,蜂窝电话等。为了这些目的,高通滤波器21用于使具有脉冲波形的光传输输入信号的高频分量和二进制电路22二值化,以将 在用于驱动用于光传输的发光二极管8的发光装置驱动电路23的前级中设置高通滤波器21以返回到脉冲波形。

    Light receiving device for reducing influence of dark current and stray light
    24.
    发明申请
    Light receiving device for reducing influence of dark current and stray light 失效
    用于减少暗电流和杂散光的影响的光接收装置

    公开(公告)号:US20070120044A1

    公开(公告)日:2007-05-31

    申请号:US11524201

    申请日:2006-09-21

    IPC分类号: H01L31/00

    摘要: Disclosed is a light receiving device for reading an optical medium compliant with any of different standards. The receiving device includes light receiving elements and an amplifier circuit. Each light receiving element is for receiving light reflected from an optical medium compliant with a different one of the standards and output a signal responsive to the received light. The amplifier circuit is for amplifying a signal derived from output of the light receiving elements. The signal amplified by the amplifier circuit is derived by subtracting an output signal of one of the light receiving elements that receives light from the optical medium from an output signal of the other light receiving elements.

    摘要翻译: 公开了一种用于读取符合任何不同标准的光学介质的光接收装置。 接收装置包括光接收元件和放大器电路。 每个光接收元件用于接收从符合不同标准的光学介质反射的光,并响应于所接收的光而输出信号。 放大电路用于放大从光接收元件的输出得到的信号。 由放大器电路放大的信号是通过从其他光接收元件的输出信号中减去从光介质接收光的一个光接收元件的输出信号得出的。

    Optical semiconductor device with enhanced light reception
    25.
    发明授权
    Optical semiconductor device with enhanced light reception 有权
    具有增强的光接收的光学半导体器件

    公开(公告)号:US06242760B1

    公开(公告)日:2001-06-05

    申请号:US09350996

    申请日:1999-07-12

    IPC分类号: H01L2715

    摘要: An object is that stray light carriers are absorbed, and hence a signal larger than actual signal will not be outputted, thereby to output more precise signals. For achieving the foregoing, a concave portion is provided on the surface of a semiconductor substrate, a light receiving element for signal detection is provided around the concave portion, a semiconductor laser element is mounted in the concave portion, and a light shielding area is provided on the side existing between the semiconductor laser element and the light receiving element for signal detection of the sides of the concave portion. This causes stray light contained in the light emitted from the semiconductor laser element to be cut off at the light shielding area. Consequently, around the light receiving element for signal detection, the occurrence of stray light carriers on the surface of the semiconductor substrate can be prevented, and hence the stray light carriers are not absorbed by the light receiving element for signal detection. Therefore, the signal of an optical recording medium can be outputted with more precision.

    摘要翻译: 一个目的是杂散光载体被吸收,因此不会输出大于实际信号的信号,从而输出更精确的信号。 为了实现上述目的,在半导体衬底的表面上设置凹部,在凹部周围设置用于信号检测的光接收元件,在凹部中安装半导体激光元件,并且设置有遮光区域 在半导体激光元件和用于信号检测凹部的侧面的光接收元件之间的一侧。 这导致在半导体激光元件发出的光中包含的杂散光在遮光区域被切断。 因此,在用于信号检测的光接收元件周围,可以防止在半导体衬底的表面上出现杂散光载流子,因此杂散光载体不被用于信号检测的光接收元件吸收。 因此,可以更精确地输出光记录介质的信号。

    Test circuit and test method that includes supplying a current to a plurality of light-receiving elements
    26.
    发明授权
    Test circuit and test method that includes supplying a current to a plurality of light-receiving elements 失效
    包括向多个光接收元件提供电流的测试电路和测试方法

    公开(公告)号:US07545156B2

    公开(公告)日:2009-06-09

    申请号:US11677077

    申请日:2007-02-21

    摘要: The test circuit according to the present invention includes: a plurality of light-receiving elements; a plurality of amplifiers, each of which converts, into a voltage, a photoelectric current supplied from one of the light-receiving elements; and an electric current supplying unit which supplies an electric current to each of the light-receiving elements and each of the amplifiers. In this test circuit, the electric current supplying unit selectively supplies an electric current to a first group of light-receiving elements and to a second group of light-receiving elements, the first group of light-receiving elements including light-receiving elements, out of the plurality of light-receiving elements, which are neither vertically nor horizontally adjacent to each other, and the second group of light-receiving elements including light-receiving elements, out of the plurality of light-receiving elements, which are vertically or horizontally adjacent to the light-receiving elements of the first group of light-receiving elements.

    摘要翻译: 根据本发明的测试电路包括:多个光接收元件; 多个放大器,每个放大器将从一个光接收元件提供的光电流转换成电压; 以及电流供应单元,其向每个光接收元件和每个放大器提供电流。 在该测试电路中,电流供给单元选择性地将电流提供给第一组光接收元件和第二组光接收元件,第一组光接收元件包括光接收元件 多个光接收元件彼此不垂直或水平相邻,并且包括在垂直或水平方向上的多个光接收元件中的包含光接收元件的第二组光接收元件 邻近第一组光接收元件的光接收元件。

    Light receiving circuit, semiconductor laser device, and optical pickup device
    27.
    发明授权
    Light receiving circuit, semiconductor laser device, and optical pickup device 失效
    光接收电路,半导体激光器件和光学拾取器件

    公开(公告)号:US07470886B2

    公开(公告)日:2008-12-30

    申请号:US11328139

    申请日:2006-01-10

    IPC分类号: H03F3/08

    CPC分类号: H01S5/0264 H01S5/0683

    摘要: There is provided a light receiving circuit capable of preventing an output variation of the light receiving circuit due to a change in ambient temperature with a simple configuration.The light receiving circuit is provided with a photodiode 4 for LD power monitoring and an I-V amplifier 5 connected with a feedback resistor 13, wherein a light receiving section 16 of the photodiode 4 is covered with a protective film 19. Temperature dependences between a light transmittance of the protective film 19 in accordance-with a shift of a wavelength of a laser beam due to a change in ambient temperature, and a resistance value of the feedback resistor 13 are set in such a way that they may be mutually compensated and an output voltage from the light receiving circuit may be constant for a temperature change.

    摘要翻译: 提供了一种能够以简单的结构防止由于环境温度的变化而导致的光接收电路的输出变化的光接收电路。 光接收电路设置有用于LD功率监测的光电二极管4和与反馈电阻13连接的IV放大器5,其中光电二极管4的光接收部分16被保护膜19覆盖。光透射率 根据环境温度变化引起的激光束的波长偏移和反馈电阻器13的电阻值的设定,使得它们可以相互补偿并输出 来自光接收电路的电压对于温度变化可以是恒定的。

    Light receiving device for reading an optical medium with reducing influence of dark current and stray light performance
    28.
    发明授权
    Light receiving device for reading an optical medium with reducing influence of dark current and stray light performance 失效
    用于读取光学介质的光接收装置,具有减小暗电流和杂散光性能的影响

    公开(公告)号:US07405386B2

    公开(公告)日:2008-07-29

    申请号:US11524201

    申请日:2006-09-21

    IPC分类号: H01J40/14

    摘要: Disclosed is a light receiving device for reading an optical medium compliant with any of different standards. The receiving device includes light receiving elements and an amplifier circuit. Each light receiving element is for receiving light reflected from an optical medium compliant with a different one of the standards and output a signal responsive to the received light. The amplifier circuit is for amplifying a signal derived from output of the light receiving elements. The signal amplified by the amplifier circuit is derived by subtracting an output signal of one of the light receiving elements that receives light from the optical medium from an output signal of the other light receiving elements.

    摘要翻译: 公开了一种用于读取符合任何不同标准的光学介质的光接收装置。 接收装置包括光接收元件和放大器电路。 每个光接收元件用于接收从符合不同标准的光学介质反射的光,并响应于所接收的光而输出信号。 放大电路用于放大从光接收元件的输出得到的信号。 由放大器电路放大的信号是通过从其他光接收元件的输出信号中减去从光介质接收光的一个光接收元件的输出信号得出的。

    Light receiving circuit, semiconductor laser device, and optical pickup device
    29.
    发明申请
    Light receiving circuit, semiconductor laser device, and optical pickup device 失效
    光接收电路,半导体激光器件和光学拾取器件

    公开(公告)号:US20060233207A1

    公开(公告)日:2006-10-19

    申请号:US11328139

    申请日:2006-01-10

    IPC分类号: H01S3/13

    CPC分类号: H01S5/0264 H01S5/0683

    摘要: There is provided a light receiving circuit capable of preventing an output variation of the light receiving circuit due to a change in ambient temperature with a simple configuration. The light receiving circuit is provided with a photodiode 4 for LD power monitoring and an I-V amplifier 5 connected with a feedback resistor 13, wherein a light receiving section 16 of the photodiode 4 is covered with a protective film 19. Temperature dependences between a light transmittance of the protective film 19 in accordance-with a shift of a wavelength of a laser beam due to a change in ambient temperature, and a resistance value of the feedback resistor 13 are set in such a way that they may be mutually compensated and an output voltage from the light receiving circuit may be constant for a temperature change.

    摘要翻译: 提供了一种能够以简单的结构防止由于环境温度的变化而导致的光接收电路的输出变化的光接收电路。 光接收电路设置有用于LD功率监测的光电二极管4和与反馈电阻13连接的I-V放大器5,其中光电二极管4的光接收部分16被保护膜19覆盖。 根据环境温度变化引起的激光束的波长偏移和反馈电阻13的电阻值,保护膜19的透光率之间的温度依赖性被设定为使得它们可以 相互补偿,并且来自光接收电路的输出电压对于温度变化可以是恒定的。