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    • 5. 发明专利
    • JPH05297452A
    • 1993-11-12
    • JP12821292
    • 1992-04-20
    • CANON APTEX INCCANON KK
    • TSUJINO HIROMICHIFURUKAWA HIDEAKINAKAZAWA NORIAKIKOBAYASHI KENJI
    • G03B21/132
    • PURPOSE:To automatically replace an original film (sheet) set on a platen glass by remote control in an overhead projector. CONSTITUTION:A sheet feeder 2 is arranged so as to cover the platen glass of an OHP device 1. A feeding film 36 is wound to a right lower roller 11, a pressing film 37 is wound to a right upper roller 12, and both films are superposed and allowed to pass on the platen glass 7, then they are wound to a left roller 13. The sheets are successively interposed at specified intervals between both films 36 and 31, and wound to the left roller 13. A remote control transmission part 5 controls to drive and rotate the respective rollers 11, 12 and 13 through a remote control reception part 41. The films 36 and 31 are taken up or rewound by the rollers, so that the sheet on the platen glass 7 is replaced with a next new one or goes back to the position of the sheet one before. Furthermore, it is possible to designate an image on a screen from a remote spot by disposing a pointer means using a laser beam.