DE725686C - Device for optical photometry in projection copiers by means of a comparative luminous surface - Google Patents

Device for optical photometry in projection copiers by means of a comparative luminous surface

Info

Publication number
DE725686C
DE725686C DEZ25061D DEZ0025061D DE725686C DE 725686 C DE725686 C DE 725686C DE Z25061 D DEZ25061 D DE Z25061D DE Z0025061 D DEZ0025061 D DE Z0025061D DE 725686 C DE725686 C DE 725686C
Authority
DE
Germany
Prior art keywords
copiers
detected
projection
luminous flux
luminous surface
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
DEZ25061D
Other languages
German (de)
Inventor
Alfred Kubitzek
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.)
Zeiss Ikon AG
Original Assignee
Zeiss Ikon AG
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 Zeiss Ikon AG filed Critical Zeiss Ikon AG
Priority to DEZ25061D priority Critical patent/DE725686C/en
Application granted granted Critical
Publication of DE725686C publication Critical patent/DE725686C/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
    • G01J1/12—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void using wholly visual means
    • G01J1/122—Visual exposure meters for determining the exposure time in photographical recording or reproducing
    • G01J1/124—Visual exposure meters for determining the exposure time in photographical recording or reproducing based on the comparison of the intensity of measured light with a comparison source or comparison illuminated surface

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)

Description

Einrichtung zum optischen Photometrieren bei Projektionskopierapparaten mittels einer Vergleichsleuchtfläche Die Erfindung betrifft eine Einrichtung zum optischen Photometrieren bei Projeküonskopierapparaten mittels einer Vergleichsleuchtfläche, bei der ein Teil des Lichtstromes der Vergrößerungslichtquelle parallel gerichtet wird und zur Erzeugung der Vergleichsleuchtfiädhe in der Kopierebene dient.Device for optical photometry in projection copiers by means of a comparative luminous surface The invention relates to a device for optical photometry with projection copiers by means of a comparative luminous surface, in which part of the luminous flux of the magnifying light source is directed parallel and is used to generate the comparative light in the copy level.

Es ist für den Meßvorgang wesentlich, daß die Vergleichsleuchtfiäche etwas heller ist als die Helligkeit des projizierten Negativs, um ein Angleichen der beiden Helligkeiten durch Verminderung der Helligkeit der Vergleichsleuchtfiäche zu erreichen, da das menschliche Auge beim Vergleich der Helligkeit zweier Flächen fehlerfreier arbeitet, wenn das Angleichen durch Verminderung der Helligkeit der einen Fläche erfolgt. Daher ist nach der Erfindung der vom Photometersystem erfaßte Lichtstrom quantitativ größler als der vom Vergrößerungssystem erfaßte Lichtstrom. It is essential for the measuring process that the comparison luminous area slightly brighter than the brightness of the projected negative to match of the two brightnesses by reducing the brightness of the comparison luminous area to achieve because the human eye when comparing the brightness of two surfaces works more error-free if the adjustment by reducing the brightness of the an area takes place. Therefore, according to the invention, that detected by the photometer system Luminous flux quantitatively greater than the luminous flux detected by the magnification system.

Dies wird nach der Erfindung dadurch erreicht, daß als Lichtquelle eine Klarglaslampe dient und daß zur Schwächung des vom Vergrößerungssystem erfaßten Lichtstromes eine in den Vergrößerungsstrahlengang eingeschakete Streuscheibe dient oder daß als Licitquelle eine teilweise mattierte Lampe dient, deren nichtmattierter Teil in der Verlängerung der optischen Achse des Photometersystems liegt. This is achieved according to the invention in that as a light source a clear glass lamp is used and that to weaken the detected by the magnification system Luminous flux is used a diffusing screen nestled in the magnification beam path or that a partially frosted lamp serves as the source of the license, the non-frosted one Part lies in the extension of the optical axis of the photometer system.

Es können an Stelle normaler Glühlampen auch Punktlichtlampen, Gasentladungslampen u. ä. verwendet werden, sofern nur immer auf die Bedingung geachtet wird, daß der vom Photometersystem erfaßte Lichtstrom größer ist als der vom Vergrößerungssystem erfaßte Licht strom. Instead of normal incandescent lamps, point lamps or gas discharge lamps can also be used and the like, provided that the condition is always met that the The luminous flux detected by the photometer system is greater than that of the magnification system detected luminous flux.

Claims (3)

PATENTANSPRÜCHE: I. Einrichtung zum optischen Photometrieren blei Projektionskopierapparaten mittels einer Vergleichsleuchtfläche, dadurch.gekennzeichnet, daß der vom Photometersystem erfaßte Lichtstrom quantitativ größer ist als der vom Vergrößerungssystem erfaßte Lichtstrom. PATENT CLAIMS: I. Device for optical photometry lead Projection copiers by means of a comparison luminous surface, characterized. that the one from the photometer system detected luminous flux quantitatively larger is than the luminous flux detected by the magnification system. 2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß als Lichtquelle eine Klarglaslampe dient und daß zur Schwächung des vom Vergrößerungssystem erfaßten Lichtstromes eine in den Vergrößerungsstrahlengang eingeschaltete Streuscheibe dient. 2. Device according to claim 1, characterized in that the light source a clear glass lamp is used and that to weaken the detected by the magnification system Luminous flux is used a lens switched into the magnification beam path. 3. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß als Lichtquelle eine teilweise mattierte Lampe dient, deren nichtmattierter Teil in der Verlängerung der optischen Achse des Photometersystems liegt. 3. Device according to claim 1, characterized in that the light source a partially frosted lamp is used, the non-frosted part in the extension the optical axis of the photometer system.
DEZ25061D 1939-01-31 1939-01-31 Device for optical photometry in projection copiers by means of a comparative luminous surface Expired DE725686C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEZ25061D DE725686C (en) 1939-01-31 1939-01-31 Device for optical photometry in projection copiers by means of a comparative luminous surface

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEZ25061D DE725686C (en) 1939-01-31 1939-01-31 Device for optical photometry in projection copiers by means of a comparative luminous surface

Publications (1)

Publication Number Publication Date
DE725686C true DE725686C (en) 1942-09-29

Family

ID=7626296

Family Applications (1)

Application Number Title Priority Date Filing Date
DEZ25061D Expired DE725686C (en) 1939-01-31 1939-01-31 Device for optical photometry in projection copiers by means of a comparative luminous surface

Country Status (1)

Country Link
DE (1) DE725686C (en)

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