JPS57155562A - Detector for original size in copying machine - Google Patents

Detector for original size in copying machine

Info

Publication number
JPS57155562A
JPS57155562A JP3958681A JP3958681A JPS57155562A JP S57155562 A JPS57155562 A JP S57155562A JP 3958681 A JP3958681 A JP 3958681A JP 3958681 A JP3958681 A JP 3958681A JP S57155562 A JPS57155562 A JP S57155562A
Authority
JP
Japan
Prior art keywords
original
assemblage
mirror
light
photodetector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP3958681A
Other languages
Japanese (ja)
Inventor
Akihiko Katsura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP3958681A priority Critical patent/JPS57155562A/en
Publication of JPS57155562A publication Critical patent/JPS57155562A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/60—Apparatus which relate to the handling of originals
    • G03G15/607—Apparatus which relate to the handling of originals for detecting size, presence or position of original
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00172—Apparatus for electrophotographic processes relative to the original handling
    • G03G2215/00177—Apparatus for electrophotographic processes relative to the original handling for scanning
    • G03G2215/00181—Apparatus for electrophotographic processes relative to the original handling for scanning concerning the original's state of motion
    • G03G2215/00185—Apparatus for electrophotographic processes relative to the original handling for scanning concerning the original's state of motion original at rest

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Holders For Sensitive Materials And Originals (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)

Abstract

PURPOSE:To detect original sizes accurately with just one photodetector provided to a titled device by using a tripple mirror assemblage. CONSTITUTION:An original is placed in conformity with a reference line 15a between an original cover 16 containing a tripple mirror assemblage 13 and an original plate 15. A motor 18 is run, and the light from a light source 20 projected through a half mirror 10 is scanned from below the plate 15 along the assemblage 13. At this time, there is no reflected light from the assemblage 13 covered with the original and the reflected light from the assemblage 13 of the part where there is no original is reflected by a mirror 17, passes through a half mirror 19 and is inputted to a photodetector 21. Hence, the quantity of the light that the photodetector 21 receives varies with the part where there is the original and the part where there is no original, whereby the size of the original is detected surely.
JP3958681A 1981-03-20 1981-03-20 Detector for original size in copying machine Pending JPS57155562A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3958681A JPS57155562A (en) 1981-03-20 1981-03-20 Detector for original size in copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3958681A JPS57155562A (en) 1981-03-20 1981-03-20 Detector for original size in copying machine

Publications (1)

Publication Number Publication Date
JPS57155562A true JPS57155562A (en) 1982-09-25

Family

ID=12557197

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3958681A Pending JPS57155562A (en) 1981-03-20 1981-03-20 Detector for original size in copying machine

Country Status (1)

Country Link
JP (1) JPS57155562A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63133139A (en) * 1986-11-26 1988-06-04 Sharp Corp Original size detector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63133139A (en) * 1986-11-26 1988-06-04 Sharp Corp Original size detector

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