DE610211C - Photoelectric light meter, especially for viewfinder chambers arranged above the receiving chamber - Google Patents
Photoelectric light meter, especially for viewfinder chambers arranged above the receiving chamberInfo
- Publication number
- DE610211C DE610211C DEZ21551D DEZ0021551D DE610211C DE 610211 C DE610211 C DE 610211C DE Z21551 D DEZ21551 D DE Z21551D DE Z0021551 D DEZ0021551 D DE Z0021551D DE 610211 C DE610211 C DE 610211C
- Authority
- DE
- Germany
- Prior art keywords
- photocell
- exposure meter
- meter according
- photoelectric exposure
- mirror
- 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
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
- G03B7/04—Control effected by hand adjustment of a member that senses indication of a pointer of a built- in light-sensitive device, e.g. by restoring point to a fixed associated reference mark
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Indication In Cameras, And Counting Of Exposures (AREA)
Description
Bei photoelektrischen Belichtungsmessern,For photoelectric light meters,
die mit dem Objektivverschluß gekuppelt sind, ist es bekannt, die Lichtintensität oder den Photozellenstrom durch Vorschalten von Filtern, Blenden o. dgl. zu verändern.which are coupled to the lens shutter, it is known the light intensity or to change the photocell current by adding filters, screens or the like.
Um auf derartige Mittel, welche gewisse Nachteile besitzen, zu verzichten, wird nach
der Erfindung der Photozellenstrom dadurch verändert, daß man die Photozelle selbst
drehbar oder schwenkbar anordnet. Hierbei kann die Photozelle durch Mittel gesteuert
werden, welche in Verbindung mit der Blendeneinstellung oder Zeiteneinstellung des photographischen
Verschlusses stehen.
In der Zeichnung ist in Abb. 1 bis 3 eine Anordnung der Photozelle ,an einer Kamera
mit über der Aufnahmekammer angeordneter Sucherkammer dargestellt. Die Photozelle 1
ist an dem drehbaren Spiegel 2 der Sucherkammer 3 angeordnet. Es kann somit bei einer Schräglage des Spiegels von etwa 450
zunächst die Beobachtung des Bildes auf der Mattscheibe 4 vorgenommen werden. Sodann
beginnt die Belichtungsmessung, indem der Spiegel 2 in. die waagerechte Lage geklappt
wird, wodurch die Photozelle 1 unmittelbar vor das Sucherobjektiv 5 gebracht wird. Die
Steuerung der Photozelle erfolgt durch eine Kurve 6. Dieselbe steht über Zahnräder 7
bis 12 in Verbindung mit der Blendeneinstellung 13 und der Zeiteneinstellung 14 des
photographischen Verschlusses 15. Die Steuerkurve 6 ist zweckmäßig koaxial zum Sucherobjektiv
5 angeordnet. Durch die obengenannte Verbindung ist die Übertragung der Blenden- und Zeitenverstellung des Objektivverschlusses
auf nur ein Steuerorgan möglich. Das Meßinstrument 16 ist ferner zur Ablesung
der vorzunehmenden Einstellung nicht mehr wie bisher mit einem Zeiger ausgestattet,
sondern auf dem Anker desselben befindet sich ein Spiegel 17, welcher einen
Lichtspalt 18 über ein Objektiv 19 nach einer Mattscheibe 20 projiziert. Mit Hilfe der Blenden-
und Zeiteneinstellung wird nun dieser Lichtspalt auf einen bestimmten Index eingestellt.
Um die Empfindlichkeit des Aufnahmematerials hierbei zu berücksichtigen, ist ferner nach der Erfindung der Lichtspalt 18
nach einer Skala 21 zu verstellen.In order to dispense with such means, which have certain disadvantages, the photocell current is changed according to the invention by arranging the photocell itself to be rotatable or pivotable. Here, the photocell can be controlled by means which are connected to the aperture setting or the time setting of the photographic shutter.
In the drawing, in Fig. 1 to 3, an arrangement of the photocell is shown on a camera with a viewfinder chamber arranged above the receiving chamber. The photocell 1 is arranged on the rotatable mirror 2 of the viewfinder chamber 3. Thus, when the mirror is at an inclination of approximately 45 ° , the image on the focusing screen 4 can first be observed. The exposure measurement then begins by folding the mirror 2 into the horizontal position, as a result of which the photocell 1 is brought directly in front of the viewfinder lens 5. The photocell is controlled by a curve 6. It is connected to the aperture setting 13 and the time setting 14 of the photographic shutter 15 via gears 7 to 12. The aforementioned connection enables the aperture and time adjustment of the lens shutter to be transmitted to just one control element. The measuring instrument 16 is furthermore no longer equipped with a pointer as before for reading the setting to be made, but on the armature of the same there is a mirror 17 which projects a light gap 18 via an objective 19 onto a ground glass 20. With the help of the aperture and time setting, this light gap is now set to a specific index. In order to take into account the sensitivity of the recording material here, the light gap 18 is furthermore to be adjusted according to a scale 21 according to the invention.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEZ21551D DE610211C (en) | Photoelectric light meter, especially for viewfinder chambers arranged above the receiving chamber |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEZ21551D DE610211C (en) | Photoelectric light meter, especially for viewfinder chambers arranged above the receiving chamber |
Publications (1)
Publication Number | Publication Date |
---|---|
DE610211C true DE610211C (en) | 1935-03-06 |
Family
ID=7625406
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEZ21551D Expired DE610211C (en) | Photoelectric light meter, especially for viewfinder chambers arranged above the receiving chamber |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE610211C (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE756282C (en) * | 1938-03-22 | 1953-02-23 | Gauthier Gmbh A | Electric light meter |
DE869006C (en) * | 1942-04-03 | 1953-03-02 | Michael Maul | Exposure controller for photographic devices with preset aperture and time |
DE1130279B (en) * | 1957-12-02 | 1962-05-24 | Agfa Ag | Camera with electric exposure meter and setting devices for exposure factors acting on it |
DE1205824B (en) * | 1961-02-02 | 1965-11-25 | Zeiss Ikon Ag | Photographic camera, lens or shutter with automatic flash |
-
0
- DE DEZ21551D patent/DE610211C/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE756282C (en) * | 1938-03-22 | 1953-02-23 | Gauthier Gmbh A | Electric light meter |
DE869006C (en) * | 1942-04-03 | 1953-03-02 | Michael Maul | Exposure controller for photographic devices with preset aperture and time |
DE1130279B (en) * | 1957-12-02 | 1962-05-24 | Agfa Ag | Camera with electric exposure meter and setting devices for exposure factors acting on it |
DE1205824B (en) * | 1961-02-02 | 1965-11-25 | Zeiss Ikon Ag | Photographic camera, lens or shutter with automatic flash |
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