JPS5672574A - Optical reader - Google Patents

Optical reader

Info

Publication number
JPS5672574A
JPS5672574A JP14957379A JP14957379A JPS5672574A JP S5672574 A JPS5672574 A JP S5672574A JP 14957379 A JP14957379 A JP 14957379A JP 14957379 A JP14957379 A JP 14957379A JP S5672574 A JPS5672574 A JP S5672574A
Authority
JP
Japan
Prior art keywords
lens system
filter
proper
value
picture signal
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
JP14957379A
Other languages
Japanese (ja)
Inventor
Fumikazu Nishikawa
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP14957379A priority Critical patent/JPS5672574A/en
Publication of JPS5672574A publication Critical patent/JPS5672574A/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
    • H04N1/03—Details of scanning heads ; Means for illuminating the original for picture information pick-up with photodetectors arranged in a substantially linear array

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Facsimile Heads (AREA)

Abstract

PURPOSE:To reduce a noize of the picture signal by making the F number of the lens system a value smaller than the proper value, and also attenuating a light beam which has passed through this lens system, to the proper exposure value by means of the filter. CONSTITUTION:A reflected ray from the original 2 is made incident to the solid image sensor 5 through the filter 10 and the lens system 4. The lens system 4 has the F number which is smaller than the proper F number. And, the exposure amount which has increased by using this lens system 4 is attenuated by the filter 10. Accordingly, since the F number of the lens system 4 has been made small, a noise of the picture signal caused by dirt of the lens system, etc. can be reduced.
JP14957379A 1979-11-20 1979-11-20 Optical reader Pending JPS5672574A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14957379A JPS5672574A (en) 1979-11-20 1979-11-20 Optical reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14957379A JPS5672574A (en) 1979-11-20 1979-11-20 Optical reader

Publications (1)

Publication Number Publication Date
JPS5672574A true JPS5672574A (en) 1981-06-16

Family

ID=15478135

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14957379A Pending JPS5672574A (en) 1979-11-20 1979-11-20 Optical reader

Country Status (1)

Country Link
JP (1) JPS5672574A (en)

Similar Documents

Publication Publication Date Title
GB1399067A (en) Light-attenuation devices
GB1324323A (en) Automatic focusing of an optical image
JPS60258502A (en) Prism treated to prevent internal reflection
JPS5737887A (en) Image reader
JPS5672574A (en) Optical reader
JPH058628B2 (en)
JPS5789731A (en) Focusing screen
JPS5722210A (en) Optical device
JPS57154206A (en) Focusing device
JPS5350852A (en) Half tone image forming optical system
JPS54123948A (en) Projector
JPS54138451A (en) Optical system for light beam deflection
RU1807582C (en) Tv camera
JPS57172254A (en) Speed measuring device
JPS5720079A (en) Solid color image pickup device
JPS5313921A (en) Image observation device
JPS5677865A (en) Optical reflection system
JPS5691256A (en) Copying apparatus
JPS5614788A (en) Optical system of color television camera
JPS53117930A (en) False signal elimination system for single-tube type color television camer a
JPS5793328A (en) Photometric distribution switching device of camera
JPS56146161A (en) Copying apparatus capable of reading image
JPS56106227A (en) Photometric device of reflex photometric system camera
JPS55101920A (en) Photometric method of single-lens reflex camera and photometric device
FR2377651A1 (en) Stereoscopic photography appts. using colour filter - is attached to camera to form composite image of scene from two viewpoints