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DE716080C - Copier with photocell used to determine the exposure time - Google Patents

Copier with photocell used to determine the exposure time

Info

Publication number
DE716080C
DE716080C DED74275D DED0074275D DE716080C DE 716080 C DE716080 C DE 716080C DE D74275 D DED74275 D DE D74275D DE D0074275 D DED0074275 D DE D0074275D DE 716080 C DE716080 C DE 716080C
Authority
DE
Germany
Prior art keywords
light
filter
copier
exposure time
photocell
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
DED74275D
Other languages
German (de)
Inventor
Paul Dautzenberg
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 DED74275D priority Critical patent/DE716080C/en
Priority to FR827570D priority patent/FR827570A/en
Priority to GB3027837A priority patent/GB504203A/en
Application granted granted Critical
Publication of DE716080C publication Critical patent/DE716080C/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
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J1/4209—Photoelectric exposure meters for determining the exposure time in recording or reproducing
    • G01J1/4223—Photoelectric exposure meters for determining the exposure time in recording or reproducing specially adapted for copy - or printing apparatus

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Control Of Exposure In Printing And Copying (AREA)

Description

Kopierapparat mit zur Belichtungszeitbestimmung dienender Photozelle Es sind photographische Kopierapparate beliannt mit einer zur Belichtungszeitbestimmung dienenden Photozelle und im Strahlengang zwischen der Belichtungsquelle und dem Negativ oder zwischen dem Negativ und der lichtempfindlichen Zelle oder auch innerhalb dieser Zelle angeordneten, Strahlen absorbierenden oder Strahlen dämpfenden Körpern.Copier with photocell used to determine the exposure time There are photographic copiers equipped with one for determining the exposure time serving photocell and in the beam path between the exposure source and the Negative or between the negative and the light-sensitive cell or within radiation-absorbing or radiation-attenuating bodies arranged in this cell.

Durch die Filterung des auf die Photozelle fallenden Lichtes werden dieser Zelle nur diejenigen Lichtanteile zugeführt und somit nur diese Lichtanteile zur Belichtungszeitbestimmung verwendet. die für den in Frage stehenden Meßvorgang praktische Bedeutung haben, d. h. für die das zu verwendende Positivmaterial lichtempfindlich ist.By filtering the light falling on the photocell only those light components are fed to this cell and thus only these light components used to determine the exposure time. those for the measurement process in question have practical importance, d. H. for which the positive material to be used is photosensitive is.

Die Erfindung besteht darin, in einem solchen Apparat ein Filter mit über seine Länge sich ändernder spektraler Durchlässigkeit, z. B. ein an sich bekanntes Verlauffilter, zwischen Lichtquelle und Photozelle zu verwenden. Es ist vorteilhaft, dieses Filter derart mit dem die Lichtstärke der Kopierlampe regelnden elektrischen Widerstand zu kuppeln, daß bei jeder Farbänderung des Kopierlichtes ein entsprechender Filterteil zur Wirkung kommt. der alle nicht zur Schnvärzung des Kopiergutes beitragenden Anteile des Kopierlichtes absorbiert. Diese Maßnahme führt zu einer besonders einfachen und leicht zu bedienenden Vorrichtung zur Berücksichtigung von Farbänderungen des Kopierlichtes bei Änderungen der Lichtstärke der Kopierlampe. The invention consists in providing a filter in such an apparatus with changing spectral transmittance over its length, e.g. B. a in itself Well-known graduated filter to be used between light source and photocell. It is advantageous to use this filter to regulate the light intensity of the copy lamp electrical resistance to couple that with every color change of the copy light a corresponding filter part comes into effect. all of which does not cause blackening the copied material contributing proportions of the copying light absorbed. This measure leads to a particularly simple and easy-to-use device for consideration of changes in the color of the copying light when the light intensity of the copying lamp changes.

Die Abbildung stellt eine Ausführungsform eines Kopierapparates dar, bei dem in Abahängigkeit von der Dichte des zu kopierenden Negativs die Beliehtungsquelie in ihrer Stärke geregelt wird und gleichzeitig ein in seiner spelitralen Durchlaßfähigkeit sich über seine Länge änderndes Filter, z. B. Verlauffilter, zwischen Lichtquelle und Negativ angeordnet ist. Dieses Verlauffilter ist dabei mit dem Einstellorgan des Kopieriampenwiderstandes gekuppelt. The figure shows an embodiment of a copier, where the source of exposure depends on the density of the negative to be copied is regulated in its strength and at the same time in its spiritual permeability filter changing over its length, e.g. B. Graduated filter, between light source and is arranged negative. This graduated filter is with the setting element of the copy lamp resistor coupled.

In der Abbildung stellt 12 die zur SIessung dienende Photozelle dar, 1 1 das zu kopierende Negativ und IO die Belichtungsquelle, die mittels des durch den HandgriE, 7 zu regelnden Widerstandes 8 in ihrer Stärke veränderbar ist. Ein verlaufendes Filter 9 ist mit dem Hebel, derart verbunden, daß bei Veränderung der Stärke der Lichtquelle, die hierbei ihre Farbe ändert, wirksam verhütet wird, daß anderes Licht zur Photozelle gelangen kann als solches, für das das Positivmaterial lichtempfindlich ist. In the figure 12 represents the photocell used for the measurement, 1 1 the negative to be copied and IO the exposure source, which by means of the the handle, 7 to be controlled resistor 8 is variable in strength. A extending filter 9 is connected to the lever in such a way that when changing the Strength of the light source, which changes its color here, is effectively prevented that different light can reach the photocell than that for which the positive material is sensitive to light.

Claims (2)

PATENTANSPRÜCHE: I. Photographischer Kopierapparat mit zur Belichtungszeitbestimmung dienender Photozelle und einem im Strahlengang zwischen Beliditungsquelle und Negativ oder zwischen Negativ und lichtelektrischer Zelle oder auch innerhalb der Zelle angeordneten, die spektrale Zusammensetzung des von der Lichtquelle ausgestrahlten Lichtes derart beeinflussenden Filter, daß nur solche Strahlen auf die lichtelektrische Zelle gelangen, für die das zu verwendende Positivmaterial lichtempiìndlich ist, dadurch gekennzcichnet, daß ein in seiner spektralen Durchlaßfähigkeit sich über seine Länge änderndes Filter, z. B. Verlauffilter, Verwendung findet. PATENT CLAIMS: I. Photographic copier for determining the exposure time serving photocell and one in the beam path between the illumination source and the negative or between negative and photoelectric cell or within the cell arranged, the spectral composition of the emitted by the light source Filter influencing light in such a way that only such rays hit the photoelectric Cell for which the positive material to be used is sensitive to light, gekennzcichnet that a in its spectral transmittance is about filter changing its length, e.g. B. Graduated filter is used. 2. Photographischer Kopierapparat nach Anspruch I, dadurch gekennzeichnet, daß das Verlauffilter mit dem Einstellorgan des Kopierlamp enwiderstandes gekuppelt ist. 2. Photographic copier according to claim I, characterized in that that the graduated filter is coupled with the adjustment element of the copier lamp resistance is.
DED74275D 1937-01-01 1937-01-01 Copier with photocell used to determine the exposure time Expired DE716080C (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DED74275D DE716080C (en) 1937-01-01 1937-01-01 Copier with photocell used to determine the exposure time
FR827570D FR827570A (en) 1937-01-01 1937-10-05 Measuring or copying device
GB3027837A GB504203A (en) 1937-01-01 1937-11-04 Improvements in or relating to photographic copying apparatus with means for measuring the density of a negative

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED74275D DE716080C (en) 1937-01-01 1937-01-01 Copier with photocell used to determine the exposure time

Publications (1)

Publication Number Publication Date
DE716080C true DE716080C (en) 1942-01-13

Family

ID=7061607

Family Applications (1)

Application Number Title Priority Date Filing Date
DED74275D Expired DE716080C (en) 1937-01-01 1937-01-01 Copier with photocell used to determine the exposure time

Country Status (3)

Country Link
DE (1) DE716080C (en)
FR (1) FR827570A (en)
GB (1) GB504203A (en)

Also Published As

Publication number Publication date
GB504203A (en) 1939-04-21
FR827570A (en) 1938-04-28

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