AT212136B

AT212136B - Photographic camera with almost continuous light value adjustment

Info

Publication number: AT212136B
Application number: AT586458A
Authority: AT
Original assignee: Agfa Ag
Priority date: 1958-08-21
Filing date: 1958-08-21
Publication date: 1960-11-25

Description

  

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  Photographische Kamera mit annähernd kontinuierlicher   Lichtwertverstellung   
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Kamerasvorgesehenen Blendenänderung ist zur Korrektur der nicht kontinuierlichen Zeitänderung eine Öffnungsund   Schliessbewegung   überlagert. Die ganze Blendenverstellung wird somit über den Winkelhebel 22 gesteuert. 



   Dieses trifft auch für die   Ausführungsform   nach Fig. 4 zu. Jedoch schliesst sich an die Sägenkurve 19b ein weiterer spiralenförmiger Kurvenabschnitt 47 an Der entsprechende Abschnitt 48 der Zeitsteuerkurve verläuft   jedoch kreisförmig. Im   Bereich der Sägenkurve 19b werden somit Blende und Belichtungszeit im wesentlichen kontinuierlich und gleichzeitig verändert, während im Bereich der Kurve 47 nur noch die Blende verändert wird. Der Kurvenabschnitt 47 kann auch in zwei Teilstücke aufgeteilt sein, die sich links und rechts an die Sägenkurve 19b anschliessen, wie überhaupt durch den Erfindungsvorschlag zahlreiche Kombinationen möglich sind. Vor allem können Änderungen der Blende, welche durch einen   Sägezahn   gesteuert werden, unterschiedlich gross bemessen sein.

   Daher lässt sich für jede Drehstellung des Einstelltopfes 13 praktisch jede   beliebige Zeit- und Blendenkombination erzielen. Der Verhä1tniswert zwi-   schen Zeit und Blende kann sich nach jeder zweckmässig erscheinenden Kurve ändern. 



    PATENTANSPRÜCHE :    
1. Photographische Kamera mit annähernd kontinuierlicher Lichtwertverstellung, dadurch gekennzeichnet, dass im Verstellbereich des in Stufen verstellbaren Verschlusses die Blende (29,33) zwischen den einzelnen Zeiteinstellungen des Verschlusses durch Entlanggleiten eines Stiftes (26) an einem Kurvenab- 
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 Blende durch Abgleiten des Stiftes (26) am steilen Stück der Sägezahnkurve für die Blendeneinstellung zurückstellbar ist.



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  Photographic camera with almost continuous light value adjustment
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The camera-provided aperture change is superimposed on an opening and closing movement to correct the discontinuous time change. The entire diaphragm adjustment is thus controlled via the angle lever 22.



   This also applies to the embodiment according to FIG. However, a further spiral-shaped curve section 47 adjoins the saw curve 19b. However, the corresponding section 48 of the time control curve is circular. In the region of the saw curve 19b, the aperture and exposure time are thus changed essentially continuously and simultaneously, while in the region of the curve 47 only the aperture is changed. The curve section 47 can also be divided into two sections, which connect to the left and right of the saw curve 19b, as numerous combinations are generally possible through the inventive proposal. Above all, changes in the diaphragm, which are controlled by a sawtooth, can be of different sizes.

   Therefore, practically any desired combination of time and aperture can be achieved for every rotary position of the adjustment pot 13. The ratio between time and aperture can change after every curve that appears useful.



    PATENT CLAIMS:
1. A photographic camera with an approximately continuous adjustment of the light value, characterized in that in the adjustment range of the shutter, which can be adjusted in steps, the aperture (29, 33) between the individual time settings of the shutter by sliding a pin (26) along a curve.
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 Aperture can be reset by sliding the pin (26) on the steep section of the sawtooth curve for the aperture setting.

Claims

2. A photographic camera according to claim 1, characterized by a transmission gear (22) provided between the time or light value adjuster (13) and the diaphragm (29, 33) which, when the adjuster moves in the same direction, the diaphragm continuously (20) between two time settings moves in the sense of the light value adjustment of the adjuster (13) and sets it back in the time switch positions (21) by a predetermined value.

3. Photographic camera according to claim 1 or 2, characterized in that the adjuster has a control cam (19) cooperating with the transmission gear with sawtooth-shaped sections of substantially spiral-shaped and radial or slightly inclined cam sections (20, 21) .

4. Photographic camera according to claim 1, 2 or 3, characterized in that the transmission gear has an angle lever (22) which rests with its one end (26) on the control cam (19) and with its other end on an aperture adjusting ring (29 ) attacks.

5. A photographic camera according to claim 4, characterized by a pin-slot connection (27, 28) between the angle lever (22) and the diaphragm ring (29).

6. A photographic camera according to claim 4, characterized in that the angle lever is mounted on the shutter housing (25) and is under the action of a spring (32) which presses one end (26) against the control cam (19).

7. A photographic camera according to claim 6, characterized in that the bearing axis (23) of the angle lever is slidably guided in an elongated hole (24) of the shutter housing and is held by the spring (32) at one end of the elongated hole.

8. Photographic camera according to at least one of the preceding claims, characterized in that the change in light value caused by the essentially radial curve sections (21) via the lumbar adjustment is approximately equal to the light value difference between two time settings of the shutter.

9. A photographic camera according to claim 8, characterized in that the change in light value brought about by an essentially helical curve section (20) across the diaphragm (29) is equal to or greater than the light value difference between two time settings of the shutter.

10. A photographic camera according to claim 8 or 9, characterized in that the light value setting ring (13) and the aperture ring (29) each have a stop (37, 38) that can be applied to the other and that the transmission gear (22) to the Orifice acting control cam (19) and a further control cam (16) acting on a lock adjuster on the common setting ring (13) overlap. Extend essentially the same angle, which is just as large as the largest clear angular distance between the stops (37, 38), such that the curves in a first <Desc / Clms Page number 5> Adjustment range in which the stops are free from each other come into effect in a second However, the adjustment range does not cause any change in the shutter setting or the transmission.

11. A photographic camera according to claim 8 or 9, characterized in that the light value adjuster is the only adjuster acting on the diaphragm and that the aforementioned transmission gear (26,22, 28) between the light value adjuster (13) and diaphragm (29a) for the whole Aperture adjustment range is designed within a predetermined light value adjustment range.

12. Photo'graphischeKameranachAnspruch8, 9 or 11, characterized in that the spiral-shaped curve sections (20) are assigned different aperture changes.

13. Photographic camera according to at least one of claims 8, 9, 11 or 12, characterized in that the control curves for aperture and time are each subdivided into a sawtooth-shaped section (19, 16) for the essentially simultaneous change of aperture and exposure time and in continuously running curve sections (47, 48), which are circular on the exposure time curve and on the Aperture curve are formed spirally.

14. Photographic camera according to at least one of the preceding claims, characterized EMI5.1 NEN transformer (4) is coupled, the path of which is limited by an adjustable stop.

15. A photographic camera according to claim 13, characterized in that the stop for the transmitter (4) is controlled by means of an automatic exposure control device.