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 surfaceInfo
- 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
Links
- 230000003287 optical effect Effects 0.000 title claims description 6
- 238000005375 photometry Methods 0.000 title claims description 4
- 230000000052 comparative effect Effects 0.000 title description 4
- 230000004907 flux Effects 0.000 claims description 9
- 239000011521 glass Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 1
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)
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) |
-
1939
- 1939-01-31 DE DEZ25061D patent/DE725686C/en not_active Expired
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