DE972752C - Frame for photographic lenses with device for reducing the aperture from the full to a preselected opening - Google Patents

Description

ISSUED SEPTEMBER 17, 1959

Sch 10342IXJ57 a

selected opening

There are, already - preferably to use in; so-called “one-eyed” single-lens reflex cameras - Establishments have become known which allow it, for the purpose of setting the viewfinder image the aperture of the photographic lens of a preselected opening to the full aperture size and when the camera shutter is released to reduce the aperture to this preselected opening by hand or automatically. The diaphragm is automatically reduced in size there by means of spring force. Is disadvantageous with such facilities that the aperture for setting the next recording again must be opened against the spring force, which represents an additional operation.

There were also already phatographfrisohe SLR cameras brought in proposal, which were provided with such facilities and in which the return of the aperture to the full Opening through the means for the closure voltage, for the film supply or for pivoting of the refx mirror into the beam path of the objective. On the other hand, can also - after Another suggestion - swiveling the reflex mirror out of the beam path to reduce the size the one held open by a spring

909 601/13

Aperture on the aforementioned! opening value used the said spring force by pressing the movement or release lever is overcome.

The invention relates to a device for reducing the aperture held open by spring force from the full to the preselected opening, which is characterized by a particularly space-saving arrangement of the setting and control means, all moving parts for the preselection, reduction and reopening of the Aperture and shutter release in a standard setting for photographic lenses are housed. This is achieved according to the invention by one in the mount body of the lens rotatably mounted ring-shaped cam support for preselecting the aperture and reducing it on the preselected opening by pressing one of the camera's shutter release on the same axis immediately upstream additional trigger is effected and their return to the full aperture takes place automatically when the latter is released. On the ring-shaped curved support is a pivotable adjustment lever for. a shift lever that moves the shutter resilient.

According to a particularly expedient embodiment, it is oscillatable and resilient The switching lever mounted on the setting lever is positively coupled with a movement lever for the panel and is operated by the additional trigger, which has a conical pressure piece for movement of the shift lever.

These and other details of the invention are illustrated by way of example in the drawing, where represent:

Fig. Ι a longitudinal section with a partial view, Fig. 2 is a ¹ cross section along line II-II of Fig. I,

Fig. 3 to 5 cross sections along line III-III of Fig. Ι with different working position of the parts.

1 denotes an adjusting cam, 2 denotes the annular cam carrier with curve sections provided on the outer circumference and assigned to the respective diaphragm sizes. 2 _Ö and a guide groove 2 _& , which is connected by a connecting piece 3 with the adjusting cam. 1 is coupled. 4 denotes the at d schwingoar mounted adjustment lever which is opposite the outer edge of the cam 2, 2 is pressed by a spring 5 _a and carries the unit swing lever e B. Furthermore, 6 denotes the additional, the shutter release of the camera on the same axis immediately upstream release with the release pin7, further 8 the diaphragm body, 9 the diaphragm grooved ring and 10 the in a known manner .von this movable diaphragm blades. 11 is a compression spring for the additional trigger 6, while 12 represents a spring for the shift lever B. With 13 a guide ring carrying the setting cam 1 is designated and with 14 the connection piece of the lens mount body with an extension arm I4 _ß for the trigger 6. Furthermore, 15 is a tubular carrier with cutouts for the aperture scale is _a and the (not shown) distance scale, 16 of distance setting for the lens barrel with worm gear 17 and the actual, for the purpose of distance setting axially displaceable Linsenfassungs- or visor body 8 having a front threaded ring 18. Next denote a, the conical pressure piece on the additional trigger 6 for actuating the shift lever B ₁ further C the movement of lever . The aperture 9, 10, which is _{mounted to swing at C 1} and with its one end through a. Pin C ₂ is coupled to the bezel grooved ring 9 and through its other end C ₃ to the shift lever B.

The operation of the device according to the invention is as follows: The desired aperture value - z. B. the aperture size 16 - is selected by setting the cam 1 on the scale I5 _a . Here, the cam carrier 2, 2 _a is moved from the 3 shown in Fig., The largest open position of the shutter corresponding position in the direction of the arrow P until the position shown in Fig. 4 position. Thereby, the control lever 4 by means of the curve 2 _a and moved so far in the direction of arrow Q against the pressure of the spring 5 until it reaches the position shown in Fig. 4 occupies, whereby the shift lever B from the position of Fig. 3 in the is brought to Fig. 4. The desired aperture is therefore preselected for the position of the parts according to FIG.

Will now. depressed after the image adjustment at full aperture for the purpose of receiving the additional shutter 6 in the direction of the depicted in FIG. 1, the arrow R, so the conical pressure element A pushes the lever B in the direction of the arrow 5 (Fig. 4) in the position according to Eig . 5 and thereby moves the lever C about its pivot point C ₁ into the position shown, the pin C ₂ bringing the diaphragm groove ring 9 and thus the diaphragm blades 10 into the preselected dimming position shown in FIG. By further pressure on the release button 6, the pressure pin 7 now releases the camera shutter.

After the release button 6 has been picked up and released, the compression spring 11 returns it to the initial position shown in FIG. 1, whereby the switch lever B swings back under the pressure of its spring 12 in the direction of arrow T to its starting position and thus fully opens the aperture again . The initial state for the next exposure is thus restored. If it is necessary to readjust the diaphragm to a larger opening, e.g. B. the diaphragm 8, the setting lever 4 is pressed against the curve 2 _a with a corresponding rotational offset of the cam carrier 2 in the direction of arrow U (Fig. 5) and thus gives the shift lever B a corresponding different starting position.

With such a device according to the invention, only the diaphragm is usual setting procedure preselected while the

Reduction of the aperture from the full to a selected opening and after the admission their return to the fully open · setting position simply by pressing the additional Trigger 6 or by its release takes place automatically and without vibration.

Claims (1)

PATENT CLAIMS: i. Mount for photographic lenses ίο with means for reducing the held open by spring force aperture of dler full to a preselected opening and a the \ ^A Closure influencing additional trigger, characterized by a rotatably mounted in the socket body of the lens annular cam support trigger the! Camera (2, 2 _a) for Preselection of the aperture (9, 10), the reduction of which to the preselected opening is effected by pressing an additional trigger (6) immediately upstream of the shutter release on the same axis and which is automatically returned to the full aperture when the latter is released. 2 ·, 2nd version for photographic lenses according to claim 1, characterized in that on the ring-shaped cam carrier (2, 2 _fl ) a pivotably mounted adjusting lever (4) for a switch that moves the diaphragm (9, 10) lever (B) is applied resiliently. 3. Socket for photographic lenses according to claims 1 and 2, characterized in that the swingable and resiliently mounted on the setting lever (4) switching lever (B) with a movement lever (C) for the diaphragm (9, 10) is positively coupled and is actuated by the additional trigger (6). 4. Socket for photographisclie lenses according to claims 1 to 3, characterized in that the resiliently mounted additional trigger (6) carries a conical pressure piece (A) for actuating the switching lever (B). 5. Socket for photographic lenses according to claims 1 to 4, characterized in that the movement lever (C) is essentially lam, elbow-shaped and is pivotably mounted at (C ₁ ) in the diaphragm body (8), one end of which is supported by a pin (C ₂ ) is coupled to the rotatable diaphragm groove ring (9) and its other end (C ₃ ) protruding from the diaphragm body (8) is coupled to the free end of the switching lever (5). Considered publications:
German Patent Nos. 688159, 726693, 819; German patent application ρ 9891 IX / 57 a D (announced on June 11, 1952); U.S. Patents Nos. 1,521,780, 2,343,206, 356 880, 2 435 752. 1 sheet of drawings © 509 699/230 3.56 (909 601/13 9 ·. 59)