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    • 7. 发明授权
    • Diffraction type filter having a wave length selectivity
    • 具有波长选择性的衍射型滤光片
    • US6084710A
    • 2000-07-04
    • US197678
    • 1998-11-23
    • Toshiaki Katsuma
    • Toshiaki Katsuma
    • G02B5/18G02B13/00G11B7/00G11B7/135G11B7/16
    • G11B7/1365G11B7/1353G11B7/139G11B2007/0006
    • A diffraction grating with a wavelength selectivity having one sectional side formed like a step is disposed at a marginal region of a filter, and only a wavelength of light whose luminous flux diameter is to be narrowed is diffracted sideways at the diffraction grating, whereby the luminous flux diameter of irradiation light is changed by a simple configuration without complicating an electric control system or restricting the direction of vibration of the irradiation light, while reducing noise. Disposed on a glass substrate 10 are a first region 11 having no diffraction grating 12A, and a second region 12 having diffraction gratings 12A constituted by long protrusions arranged in parallel at a predetermined pitch, each protrusion being continuous in one direction and having one sectional side formed like a step. The thickness (height) of one step in each diffraction grating 12A is set to such a value that the ratio of 1st-order diffracted light is made greater for the light at a wavelength of 780 nm employed for CD-R, whereas the ratio of 0-order diffracted light becomes substantially 100% for the light at a wavelength of 635 nm employed for DVD.
    • 将具有一个截面侧的波长选择性的衍射光栅设置在滤光器的边缘区域,并且只有光束直径变窄的光的波长在衍射光栅处被侧向衍射,由此发光 照射光的通量直径通过简单的配置而改变,而不会使电气控制系统复杂化或者限制照射光的振动方向,同时降低噪音。 设置在玻璃基板10上的是没有衍射光栅12A的第一区域11和具有以预定间距平行布置的长突起构成的衍射光栅12A的第二区域12,每个突起在一个方向上是连续的并且具有一个截面 形成一个步骤。 将每个衍射光栅12A中的一个步长的厚度(高度)设定为对于CD-R使用的780nm波长的光使一级衍射光的比率变大的值, 对于DVD采用的波长为635nm的光,0级衍射光基本上变为100%。
    • 9. 发明授权
    • Sound reproduction device for talking books
    • 用于说话书的声音再现设备
    • US4219703A
    • 1980-08-26
    • US814859
    • 1977-07-12
    • James Linford
    • James Linford
    • G11B7/003G11B7/1381G11B7/16
    • G11B7/003G11B7/0032
    • A sound reproducing device is disclosed for reproducing sound recorded on an optical sound track, having a manually movable wheeled vehicle with means provided for regulating its speed along such track, a light source substantially restricted to red and infrared light mounted on the vehicle for directing light onto such track, a plurality of light conduit means for transmitting light, the conduit means having input ends mounted on the vehicle and arranged in a substantially linear array transverse to the track for permitting manual movement of the source and the input ends along the optical sound track so as to receive light from the source incident upon a strip of the sound track. The conduit means have output ends arranged in a compact array and a maximum linear dimension substantially less than the length of the linear array. The device further includes photosensor means positioned to receive light from the output ends of the light conduit means and capable of providing an electrical signal substantially proportional to the intensity of the light thus received, amplifier means to receive the electrical signal from the photosensor means and for amplifying the signal, and loudspeaker means to receive the amplified electrical signal from the amplifier means for producing output sound responsive to the signal as the vehicle is moved along the optical sound track. The arrangement facilitates the reproduction of sound from a sound track having a width greater than the maximum widthwise dimension of the photosensor means thereby facilitating alignment of the light conduit means with the sound track and providing a relatively substantial signal to noise ratio.
    • 公开了一种用于再现记录在光学声轨上的声音的声音再现装置,其具有手动可移动的轮式车辆,其具有用于调节沿着该轨道的速度的装置,基本上限于安装在车辆上的红色和红外光的光源用于引导光 多个用于透射光的光导管装置,导管装置具有安装在车辆上的输入端并且布置成横向于轨道的基本上线性的阵列,以允许源和输入端沿光学声音的手动移动 轨道,以便将来自源的光线接收在声轨的条带上。 管道装置具有排列成小型阵列的输出端和基本上小于线性阵列的长度的最大线性尺寸。 该装置还包括光电传感器装置,其被定位成从光导管装置的输出端接收光,并且能够提供基本上与所接收的光的强度成比例的电信号;放大装置,用于接收来自光传感器装置的电信号 放大信号,以及扬声器装置,用于接收来自放大器装置的放大的电信号,用于当车辆沿着光学声轨移动时响应于信号产生输出声音。 该装置有助于从具有大于光传感器装置的最大宽度尺寸的宽度的声音轨道再现声音,从而便于光导管装置与声轨的对准并提供相当大的信噪比。