AT143738B - Exposure meters for cameras with a viewfinder camera. - Google Patents
Exposure meters for cameras with a viewfinder camera.Info
- Publication number
- AT143738B AT143738B AT143738DA AT143738B AT 143738 B AT143738 B AT 143738B AT 143738D A AT143738D A AT 143738DA AT 143738 B AT143738 B AT 143738B
- Authority
- AT
- Austria
- Prior art keywords
- cameras
- exposure meters
- viewfinder camera
- viewfinder
- film
- Prior art date
Links
Landscapes
- Cameras In General (AREA)
Description
<Desc/Clms Page number 1>
Belichtungsmesser für Photoapparate mit Sucherkamera.
Die Anordnung besteht im Wesen aus einer Photozelle, die an einer geeigneten Stelle unterzubringen ist. Beim Ausführungsbeispiele wurde eine zweiäugige Kamera mit horizontaler Filmführung gewählt, weil die Zelle hier am einfachsten hinter dem Spiegel unterzubringen ist. Konstruktionen mit lotrechter Filmführung sowie Kammern mit nur einer Optik bedingen weitgehende Umformung des Gehäuses. Bei den letztgenannten Kammern müsste die Photozelle etwa schwenkbar angeordnet werden.
Zur Bestimmung der Belichtungszeit wird hier die Zelle durch Hebeldruck vor die Aufnahmeebene geschwenkt und am Messwerk abgelesen.
Die Photozelle erhält durch einen fest angeordneten Spiegel hindurch Licht, zu welchem Zwecke der Spiegelbelag streifenweise (Raster) zu entfernen ist. Das so entworfene Bild kommt jenem auf dem Film j sowie dem durch den Spiegel s auf die Betrachtungsmattscheibe n geworfenen Bilde vollkommen gleich. Durch eine Ableseöffnung a hindurch kann über eine bewegliche, trommelförmige Skala b, die unmittelbar in Belichtungszeiten zu eichen ist, der Liehtwert abgelesen werden. Eine einfache Blende verhindert eine Dauerbelichtung der Zelle.
Da ein Teil des durch die Sucheroptik p einfallenden Lichtes für die Betrachtung des Bildes auf der Mattscheibe n verlorengeht, soll hier die Helligkeit durch Verwendung von Sucheroptiken grösserer relativer Öffnung aufrechterhalten bleiben. l ist eine Lupe zum Betrachten des Mattscheibenbildes.
Die Blendenringe beider Optiken p und o sind miteinander zu kuppeln. Die Aufnahmeoptik o entwirft ihr Bild auf dem Film j, der waagerecht bewegt und auf Filmspulen i mit lotrechter Achse aufgewickelt wird. g ist eine Anpressplatte, die durch Federn A gegen den Filmstreifen gepresst und wodurch ein ebenes Aufliegen des Films bewirkt wird. in ist das Stativgewinde. Der Raum t-kann zum Teil für die Aufnahme eines eventuell notwendigen Trockenelementes Verwendung finden.
**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.
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Exposure meters for cameras with a viewfinder camera.
The arrangement essentially consists of a photocell that is to be placed in a suitable location. In the exemplary embodiment, a two-lens camera with a horizontal film guide was chosen because the cell is easiest to accommodate behind the mirror. Constructions with vertical film guidance as well as chambers with only one optic require extensive reshaping of the housing. In the case of the last-mentioned chambers, the photocell would have to be arranged to be pivotable.
To determine the exposure time, the cell is swiveled in front of the recording level by pressing a lever and read on the measuring mechanism.
The photocell receives light through a fixed mirror, for which purpose the mirror covering has to be removed in strips (grid). The image designed in this way is exactly the same as that on the film j as well as the image projected through the mirror s onto the viewing screen n. The light value can be read through a reading opening a via a movable, drum-shaped scale b, which is to be calibrated directly in the exposure times. A simple diaphragm prevents permanent exposure of the cell.
Since part of the light incident through the viewfinder optics p is lost for viewing the image on the focusing screen n, the brightness should be maintained here by using viewfinder optics with a larger relative aperture. l is a magnifying glass for viewing the screen image.
The aperture rings of both optics p and o are to be coupled together. The recording optics o designs its image on the film j, which is moved horizontally and wound onto film reels i with a vertical axis. g is a pressure plate which is pressed against the film strip by springs A and which causes the film to lie flat. in is the tripod thread. The space t-can be used in part to accommodate any drying element that may be required.
** WARNING ** End of DESC field may overlap beginning of CLMS **.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT143738T | 1934-10-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
AT143738B true AT143738B (en) | 1935-11-25 |
Family
ID=3642793
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT143738D AT143738B (en) | 1934-10-12 | 1934-10-12 | Exposure meters for cameras with a viewfinder camera. |
Country Status (1)
Country | Link |
---|---|
AT (1) | AT143738B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1115123B (en) * | 1955-05-27 | 1961-10-12 | Philips Nv | Screen camera for making x-ray images |
-
1934
- 1934-10-12 AT AT143738D patent/AT143738B/en active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1115123B (en) * | 1955-05-27 | 1961-10-12 | Philips Nv | Screen camera for making x-ray images |
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