JPS57161977A - Optical reader - Google Patents

Optical reader

Info

Publication number
JPS57161977A
JPS57161977A JP56047098A JP4709881A JPS57161977A JP S57161977 A JPS57161977 A JP S57161977A JP 56047098 A JP56047098 A JP 56047098A JP 4709881 A JP4709881 A JP 4709881A JP S57161977 A JPS57161977 A JP S57161977A
Authority
JP
Japan
Prior art keywords
lens system
wave length
paper
filters
focus
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
JP56047098A
Other languages
Japanese (ja)
Inventor
Yoji Hoki
Kazuhisa Suetani
Shigeru Tani
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP56047098A priority Critical patent/JPS57161977A/en
Publication of JPS57161977A publication Critical patent/JPS57161977A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/10—Image acquisition

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Character Input (AREA)
  • Facsimile Scanning Arrangements (AREA)

Abstract

PURPOSE:To correct the shift in forcus due to transmitted light wave length of an optical lens system, by using a filter having different thickness according to the transmitted wave length used for an optical reader. CONSTITUTION:A reflected light 8 reflected from a paper 6 is collected with a lens system 7 via a filter 3 and made incident to a photodetector 8, and an image on the said paper 6 is formed. Since described information by various methods such as pencil, ball-point pen, and print ink and the like exists on the paper 6, filters 2, 3- are used with switching by means of switching mechanism 1, 4, 5 to detect required information out of the pictures, allowing to limit the reading wave length. Although the refractive index of the lens system 7 is different depending on the wave length, the focus of the lens system 7 can approximately be made constant by suitably selecting the thickness of the filters 2, 3-. Thus, even when various filters are switchingly used, since the focus can always be made constant, a sharp image can be formed on the photodetector section.
JP56047098A 1981-03-30 1981-03-30 Optical reader Pending JPS57161977A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56047098A JPS57161977A (en) 1981-03-30 1981-03-30 Optical reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56047098A JPS57161977A (en) 1981-03-30 1981-03-30 Optical reader

Publications (1)

Publication Number Publication Date
JPS57161977A true JPS57161977A (en) 1982-10-05

Family

ID=12765700

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56047098A Pending JPS57161977A (en) 1981-03-30 1981-03-30 Optical reader

Country Status (1)

Country Link
JP (1) JPS57161977A (en)

Similar Documents

Publication Publication Date Title
EP0762722A3 (en) Terminal device with built-in image sensor
KR920702166A (en) High quality three dimensional television
JPS52109954A (en) Optical signal reader
JPS57161977A (en) Optical reader
ATE203224T1 (en) PHOTOELECTRIC SENSOR FOR A DEVICE FOR REGISTER CONTROL IN A ROTARY PRINTING PRESS
DE4240804C2 (en) Device for recognizing the position and / or measuring the width of a record carrier
JPS56153314A (en) Color information reader
JPS5412229A (en) Detection system for optical color mark
JPS5735473A (en) Picture reader
JPS5597668A (en) Optical information reader
JPH039073Y2 (en)
JPS59121974A (en) Close adhesion type image sensor
JPS5342845A (en) Photo coupling device
SU936028A1 (en) Optic information recording apparatus
SU521815A1 (en) An apparatus for obtaining intersection lines of rotation bodies by a plane
JPS55926A (en) Focus servo unit of optical information reader
JPS5735469A (en) Reader for color original
JPS5629846A (en) Optical head
JPS5520575A (en) Information input pen
JPS57172477A (en) Optical reader
JPS5587115A (en) Focus detector
JPS5629263A (en) Image reading method
JPS5644126A (en) Optical signal head
JPS6423215A (en) Lens for reading original
JPS57162074A (en) Slip reader