DE873795C - SLR with exposure metering over the taking lens - Google Patents

SLR with exposure metering over the taking lens

Info

Publication number
DE873795C
DE873795C DEM8257A DEM0008257A DE873795C DE 873795 C DE873795 C DE 873795C DE M8257 A DEM8257 A DE M8257A DE M0008257 A DEM0008257 A DE M0008257A DE 873795 C DE873795 C DE 873795C
Authority
DE
Germany
Prior art keywords
ground glass
slr
taking lens
photo element
viewfinder
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
DEM8257A
Other languages
German (de)
Inventor
Fritz Meyer
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 DEM8257A priority Critical patent/DE873795C/en
Application granted granted Critical
Publication of DE873795C publication Critical patent/DE873795C/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/14—Viewfinders
    • 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
    • G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
    • G03B7/099—Arrangement of photoelectric elements in or on the camera
    • G03B7/0993—Arrangement of photoelectric elements in or on the camera in the camera
    • G03B7/0997—Through the lens [TTL] measuring
    • G03B7/09971—Through the lens [TTL] measuring in mirror-reflex cameras
    • G03B7/09976—Through the lens [TTL] measuring in mirror-reflex cameras the sensor being mounted in, before, or behind the porro-prism

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Optics & Photonics (AREA)
  • Viewfinders (AREA)

Description

Es ist bekannt, die durch das Aufnahmeobjektiv einer Kamera gehende Lichtmenge zwecks Bestimmung der Belichtungszeit mittels eines Fotoelementes zu messen. Die nachstehend beschriebene Erfindung bezieht sich auf Reflexkameras, bei denen über der Mattscheibe ein ausschwenkbares Reflexsystem, z. B. Dachkantprisma, angeordnet ist, und beim Ausschwenken deS Reflexsystems automatisch ein Sucherbild erscheint. Bei diesen Reflexkameras kann man das undurchsichtige Fotoelement hei (Bestimmung der Belichtungszeit) vor oder hinter der Mattscheibe einschalten. Beim Einschalten des Fotoelementes muß jedoch das über der Mattscheibe sich befindliche Reflexsystem (Dach'kantprisma) unabhängig vom Reflexspiegel, der sich unter der Mattscheibe befindet, ausgeschwenkt werden.It is known that going through the taking lens of a camera Amount of light for the purpose of determining the exposure time by means of a photo element measure up. The invention described below relates to reflex cameras those above the ground glass a swing-out reflex system, z. B. Roof prism, is arranged, and automatically a viewfinder image when the reflex system is swiveled out appears. In these reflex cameras, the opaque photo element can be called Switch on (determining the exposure time) in front of or behind the ground glass. At the However, switching on the photo element must be the one above the ground glass Reflex system (roof prism) independent of the reflex mirror that is located under the Ground glass is located, can be swiveled out.

Das nach dem Ausschwenken des Reflexsystems (Dachkantprisma) automatisch auftretende Sucherbild dient zur Bestimmung des Bildausschnittes, dessen Lichtintensität gemessen werden soll.Automatically after swiveling out the reflex system (roof prism) Occurring viewfinder image is used to determine the image section, its light intensity should be measured.

Die nachstehende Skizze stellt eine Ausführungsform der Erfindung dar und zeigt im Prinzip Aufbau und Wirkungsweise der Erfindung.The following sketch represents an embodiment of the invention represents and shows in principle the structure and mode of operation of the invention.

Das Aufnahmeobjektiv z entwirft über den-Reflexspiegel 2 ein Bild vorn Objekt auf der Mattscheibe 3. Beim Einschalten des Fotoelementes 9 wird automatisch nur das Dachkäntprisma 4 ausgeschwenkt und die Durchsicht vom Sucherokular 5 zurr Sucherobjektiv 6 freigegeben, so daß der Bildausschnitt, dessen Lichtintensität gemessen werden soll, sichtbar wird. Da das Dachkantprisma 4 mit dem Reflexspiegel 2 nicht gekuppelt ist, fällt das vom Objektiv i ,durchgelassene Licht auf das Fotoelement und dient zur Bestimmung der Belichtungszeit. Während der Messung ist der Film 8 durch den Schlitzverschluß 7 verdeckt: Nach der Belichtungszeitbestimmung wird das Fotoelement 9 wieder ausgeschaltet. Dabei geht .das Dachkantprisma 4 automatisch wieder in seine Ausgangslage zurück. Das Auge sieht jetzt wieder das vergrößerte Mättscheibenbild zwecks Scharfein-Stellung.The taking lens z creates an image via the reflex mirror 2 front object on the ground glass 3. When the photo element 9 is switched on, it is automatically only the roof prism 4 swiveled out and the view from the viewfinder eyepiece 5 zurr Viewfinder lens 6 released, so that the image section, its light intensity should be measured becomes visible. Since the roof prism 4 with the reflex mirror 2 is not coupled, the light transmitted by the lens i, falls on the photo element and is used to determine the exposure time. During the measurement the film is 8 covered by the focal plane shutter 7: After the exposure time determination, the Photo element 9 switched off again. The roof prism 4 goes automatically back to its original position. The eye now sees the enlarged one again Mättscheibe picture for the purpose of focusing.

Claims (1)

PATENTANSPRUCH: Spiegelreflexapparat mit Newton-Sucher und ausschwenkbarem Reflexteil, z. B. Dachkantprisma, über der Mattscheibe, dadurch gekehrtzeichnet, daß ein Fotoelement über oder unter der Mattscheibe mittels mechanischer Schaltmittel (Hebel, Getriebe usw.) eingeschaltet wird und beim Einschalten des Fotoelementes das Reflexteil über der Mattscheibe unabhängig vom Reflexspiegel unter der Mattscheibe automatisch ausgeschwenkt wird, so daß sofort die Durchsicht durch einen Sucher, der den Bildausschnitt zeigt, freigegeben, wird. PATENT CLAIM: SLR with Newtonian viewfinder and swing-out reflex part, z. B. Roof prism, above the ground glass, in that a photo element above or below the ground glass is switched on by means of mechanical switching means (lever, gear, etc.) and when the photo element is switched on, the reflective part above the ground glass is automatically swiveled out independently of the reflective mirror under the ground glass so that the view through a viewfinder, which shows the image section, is immediately released.
DEM8257A 1951-01-18 1951-01-18 SLR with exposure metering over the taking lens Expired DE873795C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEM8257A DE873795C (en) 1951-01-18 1951-01-18 SLR with exposure metering over the taking lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM8257A DE873795C (en) 1951-01-18 1951-01-18 SLR with exposure metering over the taking lens

Publications (1)

Publication Number Publication Date
DE873795C true DE873795C (en) 1953-04-16

Family

ID=7294093

Family Applications (1)

Application Number Title Priority Date Filing Date
DEM8257A Expired DE873795C (en) 1951-01-18 1951-01-18 SLR with exposure metering over the taking lens

Country Status (1)

Country Link
DE (1) DE873795C (en)

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