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    • 102. 发明授权
    • Optical information recording and reproducing apparatus
    • 光信息记录和再现装置
    • US5568461A
    • 1996-10-22
    • US425902
    • 1995-04-20
    • Kenichi NishiuchiNoyasu MiyagawaEiji OhnoNobuo Akahira
    • Kenichi NishiuchiNoyasu MiyagawaEiji OhnoNobuo Akahira
    • G11B7/0045G11B7/005G11B7/007G11B7/085G11B7/09G11B7/125G11B11/105G11B7/00
    • G11B11/10595G11B7/0045G11B7/00456G11B7/005G11B7/00718G11B7/08505G11B7/08511G11B7/0901G11B7/0908G11B7/094G11B7/126G11B7/1267G11B7/007G11B7/00736
    • An optical information recording and reproducing apparatus for recording and reproducing an information signal on/from both concave portions and convex portions of guide grooves formed on a recording medium is disclosed. The optical information recording and reproducing apparatus includes: an optical portion for focusing a light beam emitted from a light source on the recording medium; a focusing control portion for controlling a focal point of the light beam; a tracking control portion for controlling the position of the light beam; a selection portion for selecting which of the concave portions and the convex portions of the guide grooves are used for recording or reproducing; a polarity inverting portion for inverting the polarity of an output signal from the tracking control portion depending on a result selected by the selection portion; a waveform setting portion for setting a modulation pattern for the light; and a signal reproduction portion for demodulating the information signal from a light reflected or transmitted by recorded marks recorded on the recording medium; wherein at least one of the focusing control portion, the tracking control portion, the waveform setting portion and the signal reproduction portion has at least two kinds of operation conditions for recording and reproducing the information signal on/from the concave portions and the convex portions of the guide grooves, and wherein the operation conditions are selected depending on the result selected by the selection portion.
    • 公开了一种用于在形成在记录介质上的引导槽的凹部和凸部上记录和再现信息信号的光学信息记录和再现装置。 光信息记录和再现装置包括:用于将从光源发射的光束聚焦在记录介质上的光学部分; 用于控制光束的焦点的聚焦控制部分; 跟踪控制部分,用于控制光束的位置; 用于选择引导槽的哪个凹部和凸部用于记录或再现的选择部分; 极性反转部分,用于根据由选择部分选择的结果来反转来自跟踪控制部分的输出信号的极性; 用于设置光的调制图案的波形设置部分; 以及信号再现部分,用于从记录在记录介质上的记录标记反射或发射的光解调信息信号; 其中聚焦控制部分,跟踪控制部分,波形设置部分和信号再现部分中的至少一个具有至少两种操作条件,用于在凹部和凸部的凹部和凸部之间记录和再现信息信号 引导凹槽,并且其中根据由选择部分选择的结果选择操作条件。
    • 103. 发明授权
    • Method for the production of sintered powder ferrous metal preform
    • 烧结粉末黑色金属预制件的生产方法
    • US4202689A
    • 1980-05-13
    • US931320
    • 1978-08-07
    • Eiji OhnoKazuo Chikugo
    • Eiji OhnoKazuo Chikugo
    • B22F1/02B22F1/00B22F3/16C22C33/02
    • C22C33/0235B22F1/0059
    • A method for the production of sintered powder metal preform employing a novel reduction step. As-water-atomized ferrous metal particles are coated by phenol resins by adding said phenol resins to said ferrous metal particles after heating the metal particles to about 130.degree. C. to 150.degree. C. Resin coated ferrous metal particles are then filled in a mold and compacted under high pressure to produce a compacted green preform sufficient to ensure adequate strength for handling after pressing. The green preform is then heated to a reduction temperature within the range of about 1100.degree. C. to 1250.degree. C. for a time sufficient to achieve reduction of said green preform.
    • 一种使用新的还原步骤生产烧结粉末金属预制件的方法。 通过在将金属颗粒加热至约130℃至150℃之后,通过将酚醛树脂加入到所述含铁金属颗粒中,通过酚醛树脂涂覆水 - 水 - 雾化的黑色金属颗粒。然后将树脂涂覆的黑色金属颗粒填充到模具 并在高压下压实以产生压实的生坯预制件,足以确保压制后的足够的强度。 然后将生坯预成型件加热至约1100℃至1250℃范围内的还原温度足以实现所述生坯预成型件的还原的时间。