FR2224749A1 - Measurement of screened image dot density - direct and indirect illumination, dot viewed from other side - Google Patents

Measurement of screened image dot density - direct and indirect illumination, dot viewed from other side

Info

Publication number
FR2224749A1
FR2224749A1 FR7312552A FR7312552A FR2224749A1 FR 2224749 A1 FR2224749 A1 FR 2224749A1 FR 7312552 A FR7312552 A FR 7312552A FR 7312552 A FR7312552 A FR 7312552A FR 2224749 A1 FR2224749 A1 FR 2224749A1
Authority
FR
France
Prior art keywords
dot
measurement
light
direct
viewed
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
FR7312552A
Other languages
French (fr)
Other versions
FR2224749B3 (en
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.)
EXAPHOT SARL
Original Assignee
EXAPHOT SARL
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 EXAPHOT SARL filed Critical EXAPHOT SARL
Priority to FR7312552A priority Critical patent/FR2224749A1/en
Publication of FR2224749A1 publication Critical patent/FR2224749A1/en
Application granted granted Critical
Publication of FR2224749B3 publication Critical patent/FR2224749B3/fr
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0036—Devices for scanning or checking the printed matter for quality control
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/59—Transmissivity
    • G01N21/5907—Densitometers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B21/00—Microscopes
    • G02B21/0096—Microscopes with photometer devices
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F5/00—Screening processes; Screens therefor

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Quality & Reliability (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

Measurement and observation of screened dot structure to find the percentage of printable dots and their density is carried out simultaneously. A perpendicular beam of light is focussed on the chosen dot, simultaneously two other beams light it from an angle, one each side of the vertical. At the other side of the transparency is a viewing and measurement system. A beam splitter deflects part of the light from the transparency towards the observer's eye, the remainder goes to a photoelectric meter. The side illumination is varied by control resistors in the known fashion until the diffusion disc is as bright as the light passing through the screened dot.
FR7312552A 1973-04-06 1973-04-06 Measurement of screened image dot density - direct and indirect illumination, dot viewed from other side Granted FR2224749A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7312552A FR2224749A1 (en) 1973-04-06 1973-04-06 Measurement of screened image dot density - direct and indirect illumination, dot viewed from other side

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7312552A FR2224749A1 (en) 1973-04-06 1973-04-06 Measurement of screened image dot density - direct and indirect illumination, dot viewed from other side

Publications (2)

Publication Number Publication Date
FR2224749A1 true FR2224749A1 (en) 1974-10-31
FR2224749B3 FR2224749B3 (en) 1976-03-26

Family

ID=9117572

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7312552A Granted FR2224749A1 (en) 1973-04-06 1973-04-06 Measurement of screened image dot density - direct and indirect illumination, dot viewed from other side

Country Status (1)

Country Link
FR (1) FR2224749A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2433737A1 (en) * 1978-08-17 1980-03-14 Dainippon Printing Co Ltd APPARATUS FOR MEASURING THE SURFACE PERCENTAGE OF THE POINTS OF A FRAME
FR2481799A1 (en) * 1980-05-01 1981-11-06 Dainippon Screen Mfg METHOD AND DEVICE FOR MEASURING THE PERCENTAGE OF THE DARK OR LIGHT PARTS BY A SURFACE UNIT, OF HALF TINT POINTS OF AN IMAGE

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2433737A1 (en) * 1978-08-17 1980-03-14 Dainippon Printing Co Ltd APPARATUS FOR MEASURING THE SURFACE PERCENTAGE OF THE POINTS OF A FRAME
FR2481799A1 (en) * 1980-05-01 1981-11-06 Dainippon Screen Mfg METHOD AND DEVICE FOR MEASURING THE PERCENTAGE OF THE DARK OR LIGHT PARTS BY A SURFACE UNIT, OF HALF TINT POINTS OF AN IMAGE

Also Published As

Publication number Publication date
FR2224749B3 (en) 1976-03-26

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Legal Events

Date Code Title Description
ST Notification of lapse