JPS57108809A - Automatic inspection method for magnification and focus of optical reading head - Google Patents

Automatic inspection method for magnification and focus of optical reading head

Info

Publication number
JPS57108809A
JPS57108809A JP18275280A JP18275280A JPS57108809A JP S57108809 A JPS57108809 A JP S57108809A JP 18275280 A JP18275280 A JP 18275280A JP 18275280 A JP18275280 A JP 18275280A JP S57108809 A JPS57108809 A JP S57108809A
Authority
JP
Japan
Prior art keywords
magnification
focus
sensor
bit
inspection method
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.)
Granted
Application number
JP18275280A
Other languages
Japanese (ja)
Other versions
JPH0318687B2 (en
Inventor
Kazuhiro Takeda
Kenji Goto
Atsushi Sudo
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 JP18275280A priority Critical patent/JPS57108809A/en
Publication of JPS57108809A publication Critical patent/JPS57108809A/en
Publication of JPH0318687B2 publication Critical patent/JPH0318687B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE:To decide the accuracy of both the magnification and the focus of a line sensor, by reading the stripe mark which is slightly oblique to its teaveling direction and then processing the read signal. CONSTITUTION:An inspecting medium 9 having a width (w) of the white and black parts which is equal to the length (l) equivalent to a photoelectric element of a line sensor 8 is moved in the direction X to be read by the line sensor 8. Then the outputs of all bits are stored when the 1st bit is equal to the 2nd bit of the sensor 8. In this case, if coincidence is obtained between the width W of a stripe mark and the pitch (l) of the sensor 8, an output waveform (a) is obtained. And waveforms (b) and (b') are obtained if a shift of 1 bit is caused as a whole. Using this theory, the shift of magnification is known by the number of shifts of the output. The accuracy of focus is decided through the comparison between the maximum and minimum levels of the output of the sensor 8.
JP18275280A 1980-12-25 1980-12-25 Automatic inspection method for magnification and focus of optical reading head Granted JPS57108809A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18275280A JPS57108809A (en) 1980-12-25 1980-12-25 Automatic inspection method for magnification and focus of optical reading head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18275280A JPS57108809A (en) 1980-12-25 1980-12-25 Automatic inspection method for magnification and focus of optical reading head

Publications (2)

Publication Number Publication Date
JPS57108809A true JPS57108809A (en) 1982-07-07
JPH0318687B2 JPH0318687B2 (en) 1991-03-13

Family

ID=16123809

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18275280A Granted JPS57108809A (en) 1980-12-25 1980-12-25 Automatic inspection method for magnification and focus of optical reading head

Country Status (1)

Country Link
JP (1) JPS57108809A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61197504U (en) * 1985-05-30 1986-12-10

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3649113A (en) * 1969-12-04 1972-03-14 Eastman Kodak Co Projector mechanism for maintaining the film area projected on a screen preferably in focus and of a predetermined size
JPS53134370A (en) * 1978-04-14 1978-11-22 Handotai Kenkyu Shinkokai Focus control device
JPS55137507A (en) * 1979-04-13 1980-10-27 Nec Corp Automatic magnification matching device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3649113A (en) * 1969-12-04 1972-03-14 Eastman Kodak Co Projector mechanism for maintaining the film area projected on a screen preferably in focus and of a predetermined size
JPS53134370A (en) * 1978-04-14 1978-11-22 Handotai Kenkyu Shinkokai Focus control device
JPS55137507A (en) * 1979-04-13 1980-10-27 Nec Corp Automatic magnification matching device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61197504U (en) * 1985-05-30 1986-12-10

Also Published As

Publication number Publication date
JPH0318687B2 (en) 1991-03-13

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