发明授权
US3950652A Roll microfilm retrieving method and device therefor 失效
滚筒微波检测方法及其设备

  • 专利标题: Roll microfilm retrieving method and device therefor
  • 专利标题(中): 滚筒微波检测方法及其设备
  • 申请号: US453051
    申请日: 1974-03-20
  • 公开(公告)号: US3950652A
    公开(公告)日: 1976-04-13
  • 发明人: Hajime Yamashita
  • 申请人: Hajime Yamashita
  • 申请人地址: JA Tokyo
  • 专利权人: Kabushiki Kaisha Ricoh
  • 当前专利权人: Kabushiki Kaisha Ricoh
  • 当前专利权人地址: JA Tokyo
  • 优先权: JA43-75988 19681127
  • 主分类号: G06K17/00
  • IPC分类号: G06K17/00 G06K7/10
Roll microfilm retrieving method and device therefor
摘要:
A roll microfilm having a plurality of consecutive frames. Each frame has a border therearound with a plurality of small sized marks located within the border and being unequally spaced apart with respect to each other for detection by a plurality of corresponding detecting elements having the same spacing.
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