DE1092302B - Device for cinematographic lenses with means for adjusting the aperture - Google Patents

Description

GERMAN

The invention relates to a device for cinematographic lenses with adjustment means the aperture and to completely close the same by an additional handle that with the Aperture adjustment means can be optionally coupled.

The requirement of the complete closing of the aperture is preferably for the recording Purpose of scene dissolving, and it has already been suggested, for smooth and even Movement of the aperture switch off the usual notch that clearly marks the individual aperture levels, for example, by means of an externally accessible push button.

The invention provides a particularly useful and easy-to-use device of the aforementioned Art represents, and it is characterized in that the handle is pivotable and in the rest position of the Aperture adjustment means uncoupled, is coupled with him in the pivoted position of use.

In order to be able to bring about the coupling or uncoupling in a simple manner, the diaphragm adjustment means expediently tooth-like grooves corresponding to the aperture values ■ - · if necessary also Intermediate values - in which the handle engages in the swiveled-out position of use, preferably springy. Furthermore, corresponding means for the automatic lifting of the diaphragm notch can be used be provided, as well as to limit the return of the handle to the starting position (Aperture preselection).

The drawing shows schematically an embodiment of the subject matter of the invention, wherein represents Fig. 1 is a side view in partial section,

2 shows a front or partial rear view and a cross section through individual parts, 3 shows a detail in cross section.

It denotes α the lens body with connecting thread α ' for installation in the - not shown - camera housing and α ² the mount for the lens b. The ball catch c is resiliently located in a known manner in catch holes c ' of the diaphragm rotating ring d, corresponding to the values of the diaphragm scale d'. The diaphragm rotating ring d has tooth-like grooves d ² on its outer circumference and is used to adjust the diaphragm blades ei ³ . A further ring e is mounted on the rotating ring d and serves as a support for the handle /, which is designed as a lever pivotable about a pin / 'and has a resilient nose / ² on its end facing the grooves d ² , g (Fig. 2) denotes a sheet metal segment connected to the ring e by screws g ' , which serves to switch off the diaphragm notch c. A recess h in the lens body α allows the lever to be pivoted into its starting or resting device

for cinematographic lenses
with means for adjusting the aperture

Applicant:

Jos. Schneider & Co. Optical Works,
Bad Kreuznach (RhId.)

Dipl.-Ing. Herbert Mahn, Bad Kreuznach (RhId.),
has been named as the inventor

position in which it is held by a spring i . A stop k on the diaphragm rotating ring d prevents the diaphragm from closing completely during adjustment by means of the diaphragm ring itself, whereby, as shown in FIG. 2, it comes into contact with the sheet metal segment g . Finally, in FIG. 3, m designates a stop screw or the like provided in the lens body α for a counter-stop η in the rotating ring e, with a free rotation η over a certain circumferential part ensuring the adjustability of this ring.

The operation of the device is as follows: In the rest or starting position the lever / - pivoted in the direction of arrow I (Fig. 1) - held by the spring i firmly on the lens body a, embedded in the recess h. Here, the resilient lug f ^{2 is} out of engagement with the tooth-like grooves d ² of the diaphragm rotating ring d so that it can be moved freely in the usual manner, the resilient detent c in the locking holes c allowing the individual diaphragm values d ' to be set.

If the shutter is to be able to move freely and be completely closed for the purpose of a "scene fade", the lever / is pivoted into the position of use shown in accordance with the invention, whereby the resilient nose f ² according to the set aperture value into the groove d ^{2 facing it} engages in aperture ring d. When the lever is now radially rotated / in the direction of arrow II (Fig. 2), the panel can be adjusted freely over the entire closing movement, the sheet metal segment g being inserted between the resilient detent c and the locking holes c ' and the effect of the same canceling out .

When opening the screen again, the lever / can only be moved as far as the stop m (Fig. 3)

009 630/152

Move back the limited starting position that corresponds to the same previous aperture value. If a new aperture value is to be selected, after the aperture has been fully closed, the pivot lever / is swiveled back into the starting position when the film is at a standstill, uncoupled by turning it in the direction of arrow I and the new value is set using the aperture dial d using the aperture scale d '. By swiveling the lever out again / again coupling with the bezel rotating ring d and then swiveling back into the previous closed position of the bezel. Now, as the film continues, the fade-in can take place up to the stop m , which limits the new aperture value.

The pivot lever / adapts, as mentioned above, in its rest position to the outline of the lens body, while in every other position it is a clear indicator of its coupling with the bezel rotating ring represents, i.e. indicates an initiated scene dissolve. The device shown can also as a convenience for semi-automatic exposure controls serve (aperture tracking).

Claims (4)

Patent claims: 1. Device for cinematographic lenses with means for adjusting the diaphragm and for completely closing the same by an additional handle which can be optionally coupled to the diaphragm setting means, characterized in that the handle (lever /) can be pivoted and is in the rest position of the diaphragm setting means ( d) uncoupled, is coupled to it in the swiveled-out position of use. 2. Device according to claim 1, characterized in that the diaphragm adjustment means (rotating ring) has tooth-like grooves (d ² ) corresponding to the diaphragm values - possibly also intermediate values - in which the handle (e.g. the pivot lever /) engages in the swiveled-out position of use , preferably springy. 3. Device according to claims 1 and 2, characterized in that a rotating ring (e) serving as a carrier of the pivot lever (f ) carries means (e.g. a correspondingly shaped sheet metal g) for lifting the diaphragm notch (c). 4. Device according to claims 1 to 3, characterized by a stop (m, n) for limiting the return of the handle (/) to the starting position. Considered publications:
German utility model No. 1 705 369. 1 sheet of drawings © 009 630/152 10.60