JPS5676678A - Exposure light for video reader - Google Patents

Exposure light for video reader

Info

Publication number
JPS5676678A
JPS5676678A JP15383779A JP15383779A JPS5676678A JP S5676678 A JPS5676678 A JP S5676678A JP 15383779 A JP15383779 A JP 15383779A JP 15383779 A JP15383779 A JP 15383779A JP S5676678 A JPS5676678 A JP S5676678A
Authority
JP
Japan
Prior art keywords
size
terminal
trigger circuit
exposure
exposure light
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
JP15383779A
Other languages
Japanese (ja)
Inventor
Kiyohiko Kobayashi
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP15383779A priority Critical patent/JPS5676678A/en
Publication of JPS5676678A publication Critical patent/JPS5676678A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/024—Details of scanning heads ; Means for illuminating the original
    • H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up
    • H04N1/02815—Means for illuminating the original, not specific to a particular type of pick-up head

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)
  • Facsimile Scanning Arrangements (AREA)

Abstract

PURPOSE:To avoid the useless energy of exposure light source, by giving lighting only required width in matching with the size of original. CONSTITUTION:The length of a filament 11 of an exposure lamp 10 is taken sufficient to cover the short side of A-3 size. At the position to cover the short side of B-4 size, an intermediate terminal 12m is installed. The first bidirectional thyristor 131 is connected to the terminal 122, and the 2nd thyristor 132 is connected to the intermediate terminal 12m, and they are connected with the 1st trigger circuit 171 and the 2nd trigger circuit 172 respectively. With this constitution, when the original is B-4 size, and ''1'' is given to the 1 input of the AND gate 162, the trigger circuit 172 turns on the 2nd thuristor 132 and gives AC power supply between the terminal 121 and the intermediate terminal 12m to illuminate the exposure lamp 10 for the part corresponding to the width of B-4 size. Thus, the exposure to unnecessary part is not required to save the energy.
JP15383779A 1979-11-28 1979-11-28 Exposure light for video reader Pending JPS5676678A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15383779A JPS5676678A (en) 1979-11-28 1979-11-28 Exposure light for video reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15383779A JPS5676678A (en) 1979-11-28 1979-11-28 Exposure light for video reader

Publications (1)

Publication Number Publication Date
JPS5676678A true JPS5676678A (en) 1981-06-24

Family

ID=15571171

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15383779A Pending JPS5676678A (en) 1979-11-28 1979-11-28 Exposure light for video reader

Country Status (1)

Country Link
JP (1) JPS5676678A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58169142A (en) * 1982-03-25 1983-10-05 ジー・ティー・イー・プロダクツ・コーポレイション Copying machine lamp with two lengthes
JPS6352567A (en) * 1986-08-22 1988-03-05 Canon Inc Picture reader
US4954891A (en) * 1988-07-11 1990-09-04 Process Automation Business, Inc. Light guided illuminating/sectioning device for sheet inspection system
US5726774A (en) * 1994-06-17 1998-03-10 Canon Kabushiki Kaisha Document reading device with light-shielding member that prevents a local temperature increase in a document placing table

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58169142A (en) * 1982-03-25 1983-10-05 ジー・ティー・イー・プロダクツ・コーポレイション Copying machine lamp with two lengthes
JPS6352567A (en) * 1986-08-22 1988-03-05 Canon Inc Picture reader
US4954891A (en) * 1988-07-11 1990-09-04 Process Automation Business, Inc. Light guided illuminating/sectioning device for sheet inspection system
US5726774A (en) * 1994-06-17 1998-03-10 Canon Kabushiki Kaisha Document reading device with light-shielding member that prevents a local temperature increase in a document placing table

Similar Documents

Publication Publication Date Title
JPS5676678A (en) Exposure light for video reader
GB2021336A (en) Arrangement for supplying fluorescent lamps with power at two levels and lighting installation incorporating such an arrangement
FR2412090A1 (en) IMPROVEMENT OF THE ELECTRICAL CIRCUIT OF A DEVICE INCLUDING A PLURALITY OF LIGHTING LAMPS
JPS5385976A (en) Discharge lamp burning system
JPS5726877A (en) Copying machine
JPS52148981A (en) Explosion-proof type electric light apparatus
JPS5752064A (en) Electronic copying machine
JPS52146978A (en) Fluorescent lamp switch
JPS5369480A (en) Control circuit of discharge lamp lighting device
JPS55145434A (en) Automatic switch
JPS52118975A (en) Lighting device for discharge lamp
JPS52100768A (en) Device for firing flashing lamp
JPS52109774A (en) Lighting device for discharge lamp
GB2022343A (en) Apparatus for controlling the light output of a discharge lamp
JPS532968A (en) Low temperature fluorescent lamp starter
JPS5241477A (en) Fluorescent lamp lighting device
JPS56106256A (en) Exposure device of electrophotographic copier
JPS55591A (en) Flash lighting device
JPS51136423A (en) An automatic electricity saving device for a stroboscope device
JPS52120582A (en) Lighting device for discharge lamp
ES8204246A1 (en) Improvements in emergency lamp power supply circuits (Machine-translation by Google Translate, not legally binding)
JPS53125885A (en) Photometric device for two frequencies
JPS532969A (en) Low temperature fluorescent lamp starter
ES472745A1 (en) Improvements in vibrators of transistors for the supply of tension to fluorescent lamps (Machine-translation by Google Translate, not legally binding)
JPS5374765A (en) Apparatus for starting discharge lamp