DE1049227B

DE1049227B - Iris controls for photographic or cinematographic apparatus

Info

Publication number: DE1049227B
Application number: DESCH20782A
Authority: DE
Inventors: Knut Schaefer
Original assignee: Individual
Current assignee: Individual
Priority date: 1956-09-13
Filing date: 1956-09-13
Publication date: 1959-01-22

Description

DEUTSCHESGERMAN

Es sind aus zwei oder drei in parallelen Ebenen gegeneinander beweglichen, je einen Ausschnitt oder eine öffnung aufweisenden Elementen bestehende Blenden für photographische Apparate bekannt, die über federbelastete Schnüre miteinander in Verbindung stehen und mittels eines elektrischen Drehspulgerätes gegeneinander verschoben werden können. Derartige Blendenregler haben sich nicht durchsetzen können, da die zur Verdrehung der Welle des Drehspulgerätes notwendige Kraft durch Ausnutzung des Photostromes eines Belichtungsmessers nicht aufgebracht werden kann. Die Blenden dieser bekannten Blendenregler haben gegenüber der bekannten Lochblende den Vorteil, daß die Blendendurdhtrittsöffnung kontinuierlich verstellt werden kann, und gegenüber der Irisblende den Vorteil, daß sie wesentlich billiger' zu fertigen sind.There are two or three mutually movable in parallel planes, one section or each an opening having elements existing diaphragms for photographic apparatus known, the are connected to each other via spring-loaded cords and by means of an electrical moving coil device can be moved against each other. Such aperture controls have not caught on can, as the force necessary to rotate the shaft of the moving coil device by utilizing the Photocurrent of a light meter cannot be applied. The bezels of this well-known Diaphragm regulators have the advantage over the known perforated diaphragm that the diaphragm end opening can be continuously adjusted, and compared to the iris diaphragm the advantage that it is much cheaper ' are to be manufactured.

Der Erfindung liegt die Aufgabe zugrunde, einen Blendenregler zu schaffen, der von den Vorteilen der vorstehend zitierten Blenden Gebrauch macht und durch das Einstellorgan einer Kamera beeinflußt werden kann.The invention is based on the object of providing a diaphragm regulator that benefits from the advantages of makes use of the above-cited aperture and can be influenced by the setting member of a camera can.

Erfindungsgemäß wird vorgeschlagen, die beiden in parallelen Ebenen gegeneinander beweglichen Elemente der Blende um eine gemeinsame Achse schwenkbar anzuordnen und so zu beeinflussen, daß sie sich in gleicher Richtung zu bewegen suchen. Außerdem wird vorgeschlagen, auf Kanten oder Flächen beider Elemente ein einziges Steuerglied einwirken zu lassen, das mit einem Blendeneinstellorgan, beispielsweise einem Blendenring oder Blendenschieber, in Verbindung steht. Es empfiehlt sich, die Kanten oder Flächen der beiden Elemente so zu gestalten, daß gleiche Teilwege des an ihnen anliegenden Steuergliedes stets der Verstellung der Blende um eine Blendenzahl entsprechen. Zweckmäßig ist es, die Blendenelemente unter Wirkung einer einzigen Feder stehen zu lassen, deren Enden an je einem Element angreifen und deren Mittelteil um einen Festpunkt, beispielsweise um einen Stift oder eine Rolle, gelegt ist.According to the invention, it is proposed that the two elements movable relative to one another in parallel planes to arrange the diaphragm pivotable about a common axis and to influence it so that it is seek to move in the same direction. It is also suggested to work on edges or surfaces of both To let elements act a single control member with a diaphragm setting, for example an aperture ring or shutter slide. It is best to use the edges or faces to make the two elements so that the same partial paths of the control member adjacent to them always correspond to the adjustment of the aperture by one f-number. It is useful to use the panel elements to let stand under the action of a single spring, the ends of which attack one element each and the middle part of which is placed around a fixed point, for example around a pin or a roller.

Diese Anweisung bezweckt, durch entsprechende Gestaltung der Kanten oder Flächen, an denen das die Blende steuernde Glied angreift, zu erreichen, daß, wie bei Irisblenden gewohnt, der Abstand der Blendenzahlen untereinander ungleich oder, wie bei Lochblenden bekannt, untereinander gleich ist. Letzteres ist dann wichtig, wenn am Blendenring eine mit diesem verschwenkbare Skala mit Angaben über die möglichen Lichtverhältnisse vorgesehen ist und diese Skala gegenüber einer oder mehreren weiteren Skalen zur Berücksichtigung weiterer Belichtungsfaktoren verstellbar ist.The purpose of this instruction is to design the edges or surfaces on which the the diaphragm controlling member attacks to achieve that, as usual with iris diaphragms, the distance between the diaphragm numbers unequal to one another or, as is known with pinhole diaphragms, equal to one another. The latter is important if the aperture ring has a scale that can be swiveled with this and provides information about the possible lighting conditions is provided and this scale compared to one or more other scales is adjustable to take into account other exposure factors.

Zwei Ausführungsbeispiele der Erfindung werden an Hand der Zeichnungen schematisch erläutert. Es zeigtTwo exemplary embodiments of the invention are explained schematically with reference to the drawings. It shows

Blendenregler für photographische
oder kinematographische ApparateIris controls for photographic
or cinematographic apparatus

Anmelder:Applicant:

Knut Schaefer,
München 27, Gotthelfstr. 65Knut Schaefer,
Munich 27, Gotthelfstr. 65

Knut Schaefer, München,
ist als Erfinder genannt wordenKnut Schaefer, Munich,
has been named as the inventor

Fig. 1 eine Aufsicht auf zwei um eine gemeinsame Achse verschwenkbare sowie Öffnungen aufweisende Blendenelemente, die unter Wirkung einer Feder stehen und durch ein Steuerglied beeinflußbar sind,
Fig. 2 einen Schnitt durch das Objektiv einer Kamera und die das Objektiv tragende Gehäusewand mit Blendenelementen nach Fig. 1,1 shows a plan view of two diaphragm elements which can be pivoted about a common axis and which have openings and which are under the action of a spring and can be influenced by a control member.
FIG. 2 shows a section through the lens of a camera and the housing wall carrying the lens with aperture elements according to FIG. 1,

Fig. 3 als zweites Ausführungsbeispiel eine ähnliche Anordnung,3 shows a similar arrangement as a second embodiment,

Fig. 4 einen Schnitt durch ein Objektiv und die es tragende Gehäusewand mit zwei Blendenelementen nach Fig. 3.4 shows a section through an objective and the housing wall carrying it with two diaphragm elements according to Fig. 3.

Die Blende wird gebildet aus zwei um eine gemeinsame Achsel schwenkbaren Elementen 2, 3 mit je einer Öffnung 4, 5, deren Kanten 6, 7 bei allen von ihnen gebildeten Blendenöffnungen symmetrisch zur Achse 8 eines Objektivs 9 verlaufen. Die beiden Elemente 2, 3 stehen unter Wirkung einer Feder 10, deren Enden in öffnungen 11 bzw. 12 jeweils an einem der Elemente angreifen und deren Mittelteil um einen am Gehäuse feststehenden Stift 13 oder um eine Rolle gelegt ist. Auf Kanten oder Flächen 14, 15 der Blendenelemente 2, 3 wirkt ein mit dem Blendeneinstellorgan, beispielsweise einem Blendenring oder Blendenschieber, in Verbindung stehendes Steuerglied 16 ein, das im Sinne des Pfeiles 17 verstellbar geführt ist. Je nachdem, ob die Abstände zwischen den beispielsweise auf einer der Gehäueewände angebrachten Blendenmarken gleich oder ungleich sein sollen, sind die Kanten 14, 15 verschiedenartig gestaltet. Im Ausführungsbeispiel ist angenommen, daß die Verstellung des EinStellgliedes 16 um einen bestimmten, stets gleichen Teilweg jeweils einer Halbierung bzw. Verdoppelung der von den Kanten 6, 7 gebildeten Blendenöffnung entspricht.The diaphragm is formed from two elements 2, 3 pivotable about a common armpit, each with an opening 4, 5, the edges 6, 7 of which run symmetrically to the axis 8 of an objective 9 in all of the diaphragm openings formed by them. The two elements 2, 3 are under the action of a spring 10, the ends of which act in openings 11 and 12 respectively on one of the elements and the middle part of which is placed around a pin 13 fixed on the housing or around a roller. A control member 16 connected to the diaphragm setting element, for example a diaphragm ring or diaphragm slide, acts on edges or surfaces 14, 15 of the diaphragm elements 2, 3 and is adjustably guided in the direction of arrow 17. The edges 14, 15 are designed in different ways, depending on whether the distances between the diaphragm marks, which are attached, for example, to one of the housing walls are to be the same or different. In the exemplary embodiment, it is assumed that the Verstel development of the adjusting member 16 by a specified, always the same partial path in each case one half or double the of the aperture formed by the edges 6, 7th

809 730/156809 730/156

Claims

The diaphragm elements can, as FIG. 2 shows, be arranged behind the objective 9, ie between this and a film 18 to be exposed, or, as the exemplary embodiment according to FIGS. 3 and 4 shows, with attachments 19, 20 between the lenses of the objective 9 'reach into it. In this embodiment, the elements 2 ', 3' have slots 21, 22, the edges 14 ', 15' of which correspond to the edges 14, 15 of the elements 2, 3. In this case too, the elements are under the action of a spring 10 ', the ends of which engage in openings 11' and 12 'and the middle part of which is placed around a pin 13'. The openings 4 ', 5' correspond to the openings 4, 5. If an adjusting member 16 'is moved in the same way as the adjusting member 16, the elements 2', 3 'are counteracted or in the sense of the effect about their common axis 1' the spring 10 'is pivoted. To guide the adjusting members 16 and 16 ', a guide slot is expediently provided in the front housing wall (not shown). If you want to control the diaphragms of two or more optical systems at the same time, this can be achieved in a simple manner in that cutouts or openings corresponding to the number of optical systems present are provided on each of the two elements. One of these cutouts on each element can also be assigned to an electrical exposure meter so that when the aperture elements are adjusted, the access of light to the photocell of the exposure meter is changed to the same extent as the lens aperture. For the automatic control of the lens diaphragms as a function of the photocell current of an exposure meter provided with an adjustable diaphragm, the adjustment of the control element influencing the diaphragm elements can be carried out by means of an electric current, for example an electric motor. Patent claims:

1. A diaphragm for photographic or cinematographic apparatus, consisting of two elements, each having a cutout or an opening, which can move relative to one another in parallel planes, characterized in that the elements (2, 3; 2 ', 3') about a common axis (1; 1 ') are pivotable and are influenced in such a way that they seek to move in the same direction in order that edges or surfaces (14, 15;

14 ', 15') of both elements, a single control member (16; 16 ') acts, which is connected to an aperture setting element, for example an aperture ring or aperture slide.
2. Screen according to claim 1, characterized in that the edges or surfaces (14, 15; 14 ', 15') of the screen elements (2, 3; 2 ', 3') are designed so that the same partial paths of the adjacent to them Control member (16; 16 ') always correspond to the adjustment of the diaphragm by an aperture number.

3. Screen according to claim 1 or 2, characterized in that both screen elements (2, 3; 2 ', 3') are under the action of a spring (10; 10 ') , the ends of which engage one of the elements and their central part around a fixed point, for example around a pin or a roller (13; 13 '), is placed.

4. Aperture according to claims 1 to 3 for several optical systems, characterized in that each element (2, 3; 2 ', 3') has at least two cutouts and in each case a cutout of an element with a corresponding cutout of the other element an optical System is assigned.

5. Aperture according to claim 4, characterized in that one of the cutouts of an element with a corresponding section of the other element an electric light meter is assigned so that when adjusting the elements of the light access to the photocell of the exposure meter is changed.

6. Aperture according to claim 5, characterized in that for the automatic control of the lens diaphragm depending on the photocell current one provided with an adjustable diaphragm Exposure meter adjusts the control element influencing the elements a means operated by electrical current, for example an electric motor, takes place.

Considered publications:
German Patent Nos. 16 498, 101 962, 345;

German patent application ρ 1074 IX / 57 a B, made known on February 28, 1952);

British Patent Nos. 187 242, 704 172; U.S. Patents Nos. 1,287,045, 2,046,926, 339 810, 2 655 848.

1 sheet of drawings