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    • 2. 发明授权
    • Spatial light transmission apparatus
    • 空间光传输装置
    • US5548434A
    • 1996-08-20
    • US351224
    • 1994-11-30
    • Atsushi ShimonakaMototaka TaneyaHidenori KawanishiTatsuya Morioka
    • Atsushi ShimonakaMototaka TaneyaHidenori KawanishiTatsuya Morioka
    • H04B10/112H04B10/00
    • H04B10/1125
    • A spatial coherent light transmission apparatus according to the present invention, includes: a light transmitter for emitting a data signal as first coherent light; a light receiver for emitting second coherent light having a wavelength little different from that of The first coherent light, mixing and receiving the first and second coherent lights, and performing a coherent detection of the data signal. At least one of the light transmitter and the light receiver has a detection device for detecting at least one of a coherent light transmission state and a coherent light detection state. The apparatus further includes a control device for controlling at least one of the light transmitter and the light receiver based on information of the state detected by the detection device.
    • 根据本发明的空间相干光传输装置包括:光发射器,用于发射数据信号作为第一相干光; 用于发射具有与第一相干光的波长略微不同的波长的第二相干光的光接收器,混合和接收第一和第二相干光,以及执行数据信号的相干检测。 光发射器和光接收器中的至少一个具有用于检测相干光透射状态和相干光检测状态中的至少一个的检测装置。 该装置还包括控制装置,用于根据由检测装置检测到的状态的信息来控制光发射器和光接收器中的至少一个。
    • 5. 发明授权
    • System for transmitting a beam in the air
    • 用于在空中传输光束的系统
    • US5457561A
    • 1995-10-10
    • US101080
    • 1993-08-04
    • Mototaka TaneyaSeiki YanoHaruhisa TakiguchiAtsushi ShimonakaTatsuya MoriokaHidenori Kawanishi
    • Mototaka TaneyaSeiki YanoHaruhisa TakiguchiAtsushi ShimonakaTatsuya MoriokaHidenori Kawanishi
    • H04B10/61H04B10/079H04B10/11H04B10/116H04B10/293H04B10/516H04B10/556H04B10/564H04B10/572H04B10/00
    • H04B10/1121
    • A system for transmitting information with a coherent beam being propagatable in the air is arranged to include a transmitting device having a modulator and an emitting circuit and a receiving device having a generator, a mixer, a frequency discriminating circuit, and reproducing circuit. The modulator modulates a reference light frequency (wavelength) or phase of a coherent beam to be emitted from a light source according to the signal. The emitting circuit emits the modulated beam as a divergent beam having such a power density as being safe to human eyes. The generator generates a coherent locally oscillated beam. The mixer mixes the signal beam with the locally oscillated beam and photoelectric-converts the mixed beam. The frequency discriminating circuit frequency-discriminates the a.c. component of the photoelectric-converted output. The reproducing circuit reproduces a signal from the output of frequency discriminating circuit. Any one of the transmitting device and the receiving device has a function of keeping a relative light frequency difference (wavelength difference) between the signal beam and the locally oscillated beam constant.
    • 用于在空气中传播的相干光束传输信息的系统被布置成包括具有调制器和发射电路的发射装置和具有发生器,混频器,鉴频电路和再现电路的接收装置。 调制器根据信号调制要从光源发射的相干光束的参考光频率(波长)或相位。 发射电路发射调制束作为具有对人眼安全的功率密度的发散光束。 发生器产生相干局部振荡光束。 混合器将信号光束与局部振荡光束混合,并对混合光束进行光电转换。 频率鉴别电路对a.c.进行频率鉴别。 光电转换输出的分量。 再现电路从频率鉴别电路的输出再现信号。 发送装置和接收装置中的任一个具有保持信号光束与局部振荡光束之间的相对光频差(波长差)恒定的功能。
    • 6. 发明授权
    • Optical data reading apparatus and method
    • 光学数据读取装置及方法
    • US5657307A
    • 1997-08-12
    • US403257
    • 1995-03-10
    • Mototaka TaneyaTatsuya MoriokaHidenori KawanishiAtsushi Shimonaka
    • Mototaka TaneyaTatsuya MoriokaHidenori KawanishiAtsushi Shimonaka
    • G11B7/00G11B7/005G11B7/125
    • G11B7/127G11B7/005G11B7/126G11B2007/0013
    • An optical data reading method and apparatus for photoelectrically converting reflection light of a laser beam radiated onto a recording medium and thereby reproducing digital data recorded in the recording medium, performing a coherent detection by photoelectrically converting a first laser beam having a light frequency .nu..sub.1 and a second laser beam having a light frequency .nu..sub.2, where .nu..sub.1 -.nu..sub.2 .gtoreq.R (R: rate of reading the digital data), in a state where wavefronts of the first and second laser beams are aligned with each other, detecting temporal changes of either an amplitude or a phase of a beat signal component of the first and second laser beams, having a frequency of (.nu..sub.1 -.nu..sub.2) and being included in an photoelectrically converted output, and reading the digital data recorded in the recording medium based on a result of detection.
    • 一种光学数据读取方法和装置,用于对辐射到记录介质上的激光束的反射光进行光电转换,从而再现记录在记录介质中的数字数据,通过光电转换具有光频率nu 1的第一激光束和 在第一和第二激光束的波前彼此对准的状态下,具有光频率nu 2的第二激光束,其中nu 1 -nu 2> / = R(R:读数字数据的速率) 检测第一和第二激光束的拍频信号分量的幅度或相位的时间变化,其频率为(nu-nu 2)并被包括在光电转换输出中,并且读取记录在 基于检测结果的记录介质。
    • 9. 发明授权
    • Optical information reading method for reducing laser noise using a
semiconductor laser and a driving device for the semiconductor laser
    • 使用半导体激光器降低激光噪声的光信息读取方法和用于半导体激光器的驱动装置
    • US5448548A
    • 1995-09-05
    • US140748
    • 1993-10-21
    • Mototaka TaneyaTatsuya MoriokaAtsushi Shimonaka
    • Mototaka TaneyaTatsuya MoriokaAtsushi Shimonaka
    • G11B7/125H01S5/042
    • G11B7/126
    • A method for optically reading recorded information by radiating laser light emitted from a semiconductor laser which oscillates in a single longitudinal mode to an information recording medium and by detecting laser light reflected from a recording face of the information recording medium is disclosed. In the method, the optical frequency of the laser light is modulated in order that the modulated optical frequency is a periodic function dependent on time, and the absolute value of a time differential coefficient R (Hz/s) of the periodic function, a spectral line width .delta. .nu. (Hz) of the laser light, and a time period .tau. (s) from the time when the laser light is emitted to the time when the laser light reflected from the recording face of the information recording medium reaches the semiconductor laser satisfy the condition of R.gtoreq..delta. .nu./.tau.. The periodic function varies to have a sawtooth waveform or a triangular waveform.
    • 公开了一种通过将从单个纵向模式振荡的半导体激光器发射的激光照射到信息记录介质上并通过检测从信息记录介质的记录面反射的激光来光学读取记录信息的方法。 在该方法中,调制激光的光频率,使得调制光频率是依赖于时间的周期函数,周期函数的时间微分系数R(Hz / s)的绝对值,光谱 激光的线宽Δnu(Hz)和从激光发射时到从信息记录介质的记录面反射的激光到达半导体激光器的时刻的时间段τ(s) 满足R> / =Δnu/τ的条件。 周期函数变化具有锯齿波形或三角形波形。