DE705413C - 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
- DE705413C DE705413C DEZ24720D DEZ0024720D DE705413C DE 705413 C DE705413 C DE 705413C DE Z24720 D DEZ24720 D DE Z24720D DE Z0024720 D DEZ0024720 D DE Z0024720D DE 705413 C DE705413 C DE 705413C
- Authority
- DE
- Germany
- Prior art keywords
- projection
- copiers
- luminous surface
- optical
- photometer
- 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 6
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005286 illumination 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)
- Control Of Exposure In Printing And Copying (AREA)
Description
Einrichtung zum optischen Photometrieren bei Projektionskopierapparaten mittels einer Vergleichsleuchtfläche Die Erfindung bezieht sich auf eine Einrichtung zum optischen Photometrieren bei Projektionskopierapparaten mittels einer Vergleichsleuchtfläche, die durch einen von der VergröPj erungslichtquell e abgezweigten Teillichtstrom erleuchtet wird.Device for optical photometry in projection copiers by means of a comparative luminous surface The invention relates to a device for optical photometry in projection copiers by means of a comparative luminous surface, the partial luminous flux branched off from the magnifying light source becomes enlightened.
Bei diesen bekannten Einrichtungen fällt die Alöglichkeit einer Eichung des Photometers weg, sobald der Vergrößerungsmaßstab geändert wird da die Helligkeit des Vergleichseuchtfeldes dementsprechend ab-oder zunnimmt. With these known devices the possibility of a calibration falls the photometer away as soon as the magnification is changed because the brightness the comparison field of disease decreases or increases accordingly.
Um diesen Nachteil zu vermeiden, um also die Helligkeit des Vergleichsleuchtfeldes in jedem Abstand des Kopierfeldes vom Ropierapparat gleich groß zu halten. ist gemäß der Erfindung der abgezweigte Teil des Lichtstromes parallel gerichtet. In order to avoid this disadvantage, i.e. to reduce the brightness of the comparison luminous field to keep the same size at every distance of the copying field from the copier. is according to of the invention, the branched off part of the luminous flux is directed parallel.
Ein weiteres Merkmal der Erfindung besteht dann, daß im Photometerstrahlengang an Stelle sonst üblicher Mittel (Kondensor, Spalt usw.) als einziges optisches Mittel ein Holllspiegel zur Parallelrichtung des Teillichtstromes und zur Projektion der Vergleichsleuchtfläche auf die Kopierebene dient. Another feature of the invention is that in the photometer beam path instead of the usual means (condenser, slit, etc.) as the only optical means a Holllspiegel for the parallel direction of the partial luminous flux and for the projection of the Comparative luminous area is used on the copying plane.
In der Zeichnung sind in den Abb. I und 2 zwei Ausführungsbeispiele des Erfindungsgegenstandes dargestellt. In the drawing are in Figs. I and 2, two embodiments of the subject matter of the invention.
Die Abb. 1 zeigt einen Vergrößerungsapparat 1 mit der Kopierfläche 9 und der Photometereinrichtung 3. Der Vergrößerungsapparat I zeigt den üblichen Aufbau. bestehend aus Lampengehäuse 1a, Lichtquelle 2, Kondensor 4, Negativbalter 5 und Projektionsobjektiv 7. Fig. 1 shows an enlarger 1 with the copying surface 9 and the photometer device 3. The enlarger I shows the usual Construction. consisting of lamp housing 1a, light source 2, condenser 4, negative holder 5 and projection lens 7.
Das Photometer besteht aus einem rohrförmigen Gehäuse 10, das durch die Wand des Lampengehäuses 1fl hindurehragt. In seinem Inneren sind der Kondensor 11. das Objektiv 14, eine feste Blende 20 zur Unterdrückung von Streustrahlen und eine Maske 15 angeordnet. An einem Verlängerungsansatz 0a des Gehäuses 10 ist ein Spiegel r6 mit Griff 17 einseitig oder allseitig schwenkbar angebracht.The photometer consists of a tubular housing 10, which is through the wall of the lamp housing 1fl protrudes. Inside are the condenser 11. the lens 14, a fixed aperture 20 for suppressing scattered rays and a mask 15 is arranged. At an extension approach 0a of the housing 10 is a Mirror r6 with handle 17 attached so that it can be swiveled on one side or in all directions.
Durch die beiden Einrichtungen entstehen auf der Projektionsfläche 9 nebeneinander cin Bild 8 des Negativs 6 und das gleichmäl3ig erleuchtete Photometerfeld 1 8. The two facilities are created on the projection surface 9 next to each other a picture 8 of the negative 6 and the evenly illuminated photometer field 1 8.
Die Photometereinlichtung flach Abb. 2 unterscheidet sich von derjenigen nach Abb. 1 dadurch daß der Spiegel 16 zwischen Kondensor 1 l und Objektiv 14 angeordnet ist. The photometer illumination flat in Fig. 2 differs from that according to Fig. 1 in that the mirror 16 is arranged between the condenser 11 and lens 14 is.
Die Feststellung der günstigsten Belichtungszeit erfolgt nach Abb. 1 und 2 dadurch, daß man eines der beiden Meßfelder, d. h. entweder das Negativbild 8 oder das Photometerfeld i8, durch geeignete Hilfsmittel, wie Blenden oder Graukeile. so lange schwächt, bis die Helligkeit der beiden Meßfelder übereinstilnmt. Man wird hierbei unter Umständen nicht die gesamte Hellig-keit des Negativbildes, sondern die Helligkeit eines bildwichtigen Teiles als Photometervergleichsobjekt heranziehen. The most favorable exposure time is determined according to Fig. 1 and 2 in that one of the two measuring fields, i. H. either the negative image 8 or the photometer field i8, using suitable aids such as diaphragms or gray wedges. weakens until the brightness of the two measuring fields is the same. You will under certain circumstances not the entire brightness of the negative image, but rather use the brightness of a part that is important for the image as a photometer comparison object.
Als lichtschwächende Mittel im Photometerstrahlengange sind eine Blende 1 2 mit Griff 13 in den konvergenten Strahlengang zwischen Kondensor 11 und Objektiv 14 eingefügt. Da die Helligkeir des Vergleichsleuchtfeldes in jedem Abstand des Kopierfeldes vom Kopierapparat gleich groß ist, kann man die Blendeneinstellvorrichtung für jede beliebige Vergrößerung ohne Umrechnung anwenden. As light attenuating means in the photometer beam path are a Aperture 1 2 with handle 13 in the convergent beam path between condenser 11 and Lens 14 inserted. Because the brightness of the comparison luminous field at every distance of the copying field of the copier is the same, you can use the aperture setting device apply to any enlargement without conversion.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEZ24720D DE705413C (en) | 1938-08-02 | 1938-08-02 | 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 |
---|---|---|---|
DEZ24720D DE705413C (en) | 1938-08-02 | 1938-08-02 | Device for optical photometry in projection copiers by means of a comparative luminous surface |
Publications (1)
Publication Number | Publication Date |
---|---|
DE705413C true DE705413C (en) | 1941-04-28 |
Family
ID=7626219
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEZ24720D Expired DE705413C (en) | 1938-08-02 | 1938-08-02 | Device for optical photometry in projection copiers by means of a comparative luminous surface |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE705413C (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1032083B (en) * | 1955-10-03 | 1958-06-12 | Kindermann & Co G M B H | Enlarger |
US2985067A (en) * | 1956-12-14 | 1961-05-23 | Kamera & Kinowerke Dresden Veb | Enlargement indicators for photographic enlarging and reproducing apparatuses |
-
1938
- 1938-08-02 DE DEZ24720D patent/DE705413C/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1032083B (en) * | 1955-10-03 | 1958-06-12 | Kindermann & Co G M B H | Enlarger |
US2985067A (en) * | 1956-12-14 | 1961-05-23 | Kamera & Kinowerke Dresden Veb | Enlargement indicators for photographic enlarging and reproducing apparatuses |
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