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DE767288C - Magnification device with photoelectric light meter - Google Patents

Magnification device with photoelectric light meter

Info

Publication number
DE767288C
DE767288C DEL97278D DEL0097278D DE767288C DE 767288 C DE767288 C DE 767288C DE L97278 D DEL97278 D DE L97278D DE L0097278 D DEL0097278 D DE L0097278D DE 767288 C DE767288 C DE 767288C
Authority
DE
Germany
Prior art keywords
light meter
photoelectric light
magnification device
photocell
light
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
DEL97278D
Other languages
German (de)
Inventor
Walter Luehrig
Josef Wilhelm Dipl-Ing Winkler
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DEL97278D priority Critical patent/DE767288C/en
Application granted granted Critical
Publication of DE767288C publication Critical patent/DE767288C/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
    • G01J1/4219—Photoelectric exposure meters for determining the exposure time in recording or reproducing specially adapted for enlargers

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Description

Die Erfindung betrifft ein Vergrößerungsgerät mit photoellektrischem Belichtungsmesser. Es ist bekannt, zur Belichtungsmessung ein vergrößertes Bild des Negativs zu projizieren, damit man die Photozelle auf den gewünschten Bildteil einstellen kann. Dabei diente als bildschirm eine Mattscheibe, die zwecks Scharfeinstellung in der Durchsicht betrachtet wurde und hinter der die bewegliche Photozelle lag. Für die Herstellung photographischer Vergrößerungen ist ein Bildschirm für Aufsichtsbetrachtung vorzuziehen. The invention relates to an enlarger with photoelectric Light meter. It is known to use an enlarged image for exposure measurement of the negative to project the photocell onto the desired part of the image can adjust. A focusing screen served as the screen, which was used for focusing was viewed in the transparency and behind which the movable photocell was located. For the production of photographic enlargements there is a screen for viewing from above preferable.

Eine gewöhnliche Mattscheibe wäre hierzu nicht geeignet, weil sie das meiste Licht durchtreten läßt und daher nur ein lichtschwaches Aufsichtsbild ergibt.An ordinary screen would not be suitable for this because it allows most of the light to pass through and therefore only a faint image results.

Erfindungsgemäß wird daher die Photozeile hinter einem Bildschirm angebracht der zwar ebenfalls lichtdurchlässig. aber für die Betrachtung in der Aufsicht eingerichtet ist und das Licht kräftig, vorzugsweise etwa zur Hälfte diffus reflektiert. According to the invention, therefore, the photo line is behind a screen attached which is also translucent. but for viewing in the Supervision is set up and the light is strong, preferably about half diffuse reflected.

Ein Ausführungsbeispiel ist in Fig. I (Aufriß) und fig. 2 (Grundriß) dargestellt, Ein Kästchen k mit zweckentsprechend ausgeführter Innenwand, auf dessen Boden eine Photozelle f angebracht ist, wird mit einer halblichtdurchlässigen Scheibe S oben abgedeckt. ie Oberseite dieser Scheibe wird beim Vergrößern als Einstellfläche benutzt. An embodiment is shown in Fig. I (elevation) and fig. 2 (ground plan) shown, a box k with appropriately designed inner wall, on its A photocell f is attached to the bottom with a semi-translucent pane S covered above. The top of this disc is used as a setting surface when enlarged used.

Ein großer Teil der Lichtstrahlen L' wird diffus retlektiert und dient zur Beobachtung des Bildes beim Einstellen. der andere Teil L2 trifft die Photozelle f, deren Photostrom von einem geeichten Galvanometer G ange zeigt wird. Die lichtempfindliche Schicht (etwa Bromsilberpapier) kann nun zwecks belichtung direkt auf die Scheibe s gelegt werden oder durch eine Kassette an die Stelle von S gebracht werden.A large part of the light rays L 'is reflected diffusely and is used to observe the picture while adjusting. the other part L2 hits the photocell f, the photocurrent of which is indicated by a calibrated galvanometer G. The light sensitive Layer (such as bromide silver paper) can now be applied directly to the pane for exposure s or put in place of S through a cassette.

Claims (1)

PATENTANSPRUCH : Vergrößerungsgerät mit photoelektrischem Belichtungsmesser, dadurch gekennzeichnet, daß die Photozelle hinter einem lichtdurchlässigen. für die Betrachtung und Einstellung in der Aufsicht eingerichteten Bildschirm angebracht ist, der das Licht kräftig, vorzugsweise etwa zur Hälfte diffus reflektiert. PATENT CLAIM: enlarger with photoelectric light meter, characterized in that the photocell behind a translucent. for the viewing and setting in the supervision set up screen attached is, which reflects the light strongly, preferably about half diffusely. Zur Ahgrenzung des Erfindungsgegenstans vom Stand der Technik sind im Erteilungsverfahren folgende Druckschriften in Betracht gezogen worden: Deutsche Patentschriften Nr. 571 758. To delimit the subject matter of the invention from the prior art are The following publications were considered in the granting procedure: German Patent Specification No. 571,758. 580 815; britische Patentschrift Nr. 344 900: » die photographische Industrie «, 1931. 580 815; British Patent No. 344 900: "The photographic Industry «, 1931. S. 828 bis 829 ; » Die Kinotechnik «, 1930, Heft 20, S. 548. Pp. 828 to 829; "Die Kinotechnik", 1930, issue 20, p. 548.
DEL97278D 1939-03-01 1939-03-01 Magnification device with photoelectric light meter Expired DE767288C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEL97278D DE767288C (en) 1939-03-01 1939-03-01 Magnification device with photoelectric light meter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL97278D DE767288C (en) 1939-03-01 1939-03-01 Magnification device with photoelectric light meter

Publications (1)

Publication Number Publication Date
DE767288C true DE767288C (en) 1952-04-15

Family

ID=7288571

Family Applications (1)

Application Number Title Priority Date Filing Date
DEL97278D Expired DE767288C (en) 1939-03-01 1939-03-01 Magnification device with photoelectric light meter

Country Status (1)

Country Link
DE (1) DE767288C (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1036040B (en) * 1954-05-29 1958-08-07 Agfa Ag Optical copier with a device that automatically regulates the exposure of the copy paper
DE1036627B (en) * 1953-04-01 1958-08-14 Fred Lander Photoelectric exposure control device for photographic copiers
DE1171726B (en) * 1962-10-25 1964-06-04 Kieler Howaldtswerke Ag Setting screen for copying frame with electronic control device for the exposure time

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB344900A (en) * 1929-09-10 1931-03-10 Cambridge Instr Co Ltd Improvements in and relating to photographic printing
DE571758C (en) * 1931-12-02 1933-03-04 Schmidt Karl Photographic copier
DE580815C (en) * 1932-04-28 1933-07-17 Florenz Berkenbusch Dr Device designed as a handheld device for determining the most suitable layer carrier, for example developing paper, and the exposure time

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB344900A (en) * 1929-09-10 1931-03-10 Cambridge Instr Co Ltd Improvements in and relating to photographic printing
DE571758C (en) * 1931-12-02 1933-03-04 Schmidt Karl Photographic copier
DE580815C (en) * 1932-04-28 1933-07-17 Florenz Berkenbusch Dr Device designed as a handheld device for determining the most suitable layer carrier, for example developing paper, and the exposure time

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1036627B (en) * 1953-04-01 1958-08-14 Fred Lander Photoelectric exposure control device for photographic copiers
DE1036040B (en) * 1954-05-29 1958-08-07 Agfa Ag Optical copier with a device that automatically regulates the exposure of the copy paper
DE1171726B (en) * 1962-10-25 1964-06-04 Kieler Howaldtswerke Ag Setting screen for copying frame with electronic control device for the exposure time

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