FR1435235A - Process for the automatic adjustment of lighting, in microfilm photographic recorders of texts, drawings or other documents - Google Patents

Process for the automatic adjustment of lighting, in microfilm photographic recorders of texts, drawings or other documents

Info

Publication number
FR1435235A
FR1435235A FR9707A FR9707A FR1435235A FR 1435235 A FR1435235 A FR 1435235A FR 9707 A FR9707 A FR 9707A FR 9707 A FR9707 A FR 9707A FR 1435235 A FR1435235 A FR 1435235A
Authority
FR
France
Prior art keywords
texts
lighting
documents
drawings
automatic adjustment
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.)
Expired
Application number
FR9707A
Other languages
French (fr)
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.)
MIKROFILM GmbH
Original Assignee
MIKROFILM GmbH
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 MIKROFILM GmbH filed Critical MIKROFILM GmbH
Priority to FR9707A priority Critical patent/FR1435235A/en
Application granted granted Critical
Publication of FR1435235A publication Critical patent/FR1435235A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/72—Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus
    • G03B27/80—Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus in dependence upon automatic analysis of the original

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
FR9707A 1965-03-18 1965-03-18 Process for the automatic adjustment of lighting, in microfilm photographic recorders of texts, drawings or other documents Expired FR1435235A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9707A FR1435235A (en) 1965-03-18 1965-03-18 Process for the automatic adjustment of lighting, in microfilm photographic recorders of texts, drawings or other documents

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9707A FR1435235A (en) 1965-03-18 1965-03-18 Process for the automatic adjustment of lighting, in microfilm photographic recorders of texts, drawings or other documents

Publications (1)

Publication Number Publication Date
FR1435235A true FR1435235A (en) 1966-04-15

Family

ID=8574270

Family Applications (1)

Application Number Title Priority Date Filing Date
FR9707A Expired FR1435235A (en) 1965-03-18 1965-03-18 Process for the automatic adjustment of lighting, in microfilm photographic recorders of texts, drawings or other documents

Country Status (1)

Country Link
FR (1) FR1435235A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1925683A1 (en) * 1968-05-24 1969-12-04 Xerox Corp Lighting device for a projection apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1925683A1 (en) * 1968-05-24 1969-12-04 Xerox Corp Lighting device for a projection apparatus

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