DE1017908B - Device for the automatic adjustment of a lens aperture - Google Patents

Description

With so-called "one-eyed" single-lens reflex cameras has already become known, the lens aperture for the purpose of image adjustment at its largest Hold the opening position until it reaches a preselected opening size when the shutter is released is closed using appropriate means, usually automatically.

The invention relates to such a device, which is located in the mount body of a photographic lens is arranged and the closing of the aperture to the preselected value or its return to the Open position by a shutter release of the camera directly in front of the shutter and on the same axis, causes additional print trigger.

The novelty compared to the known devices of this type is that the additional pressure trigger as an axially movable slide secured against rotation with a helical part is formed, the forward and backward movement mediates the closing or opening of the diaphragm.

The invention is further characterized by a bushing with guide grooves for said Slider, the helical part of which protrudes through the slot of another socket and the shutter release the camera is applied, this socket being rotatably mounted and receiving a spring which is coupled to the aperture ring via an extended part (= adjustment arm).

The new facility, which is characterized by great simplicity and safe operation, is illustrated schematically in the drawing. 1 shows a longitudinal section through an objective mount with a device according to the invention, and FIG. 2 shows a diagram of the individual parts thereof.
It refers to the release button A, B a sleeve with incorporated longitudinal grooves B ', in which a slider C against the pressure of a spring but can be moved axially D nonrotatably. A helical part C of the slide C protrudes into a slot E 'of a socket E in which a spiral spring F is located. One end of the same is fastened in an opening F "of the socket E , while the other end rests under a slight bias against the edge E '" of a recess E "of the socket E and is extended to an adjusting arm F' which is inserted into an eyelet // 'of the diaphragm ring // protrudes and holds it in the direction of the largest opening position. G is a dial ring for the diaphragm division that can be rotated on the lens mount O and carries a stop G' . / denotes the diaphragm blades and K the shutter release of the camera.

The mode of operation of this device according to the invention is as follows:

By turning the scale ring G on the respective device for the automatic adjustment of a lens diaphragm

Applicant:

Isco Optical Works
society with limited

Liability Göttingen,
Turn over Göttingen

Rudolf Haupt, Weende via Göttingen,
has been named as the inventor

The stop G ' is preset accordingly for the desired aperture size. When the actuating button A is pressed down for the purpose of releasing the lock, the slide C is moved downwards against the action of the spring D and rotates the socket E by means of the helical extension C so that the elongated adjustment arm F 'of the helical spring F and thus the eyelet H' laterally until the stop G 'is swung out, the adjustment arm F' the resulting. Absorbs counter pressure resiliently. Immediately afterwards the shutter release K is actuated. After releasing the button A , the resilient adjustment arm F ' and the spring D move the parts back into the aforementioned position, which corresponds to the largest aperture.

If the stop G 'is set to a large aperture by means of the graduated ring G , so the aperture should retain its greatest value during recording, the helical part of the spring F absorbs part or all of the rotary movement of the socket E , with the in its position held adjusting arm F ' slides along the recess E "of the same.

Claims (3)

Patent claims: 1. In a release housing of a lens mount body arranged device for automatic adjustment of a lens aperture from the full to a preselected opening at the Shutter release by means of an adjusting arm holding the diaphragm in its largest open position and an additional pressure release immediately upstream of the camera shutter release, characterized in that the additional - borrowed pressure release as axially movable, against 709 756/274 Rotation secured slide (C) is formed with a helical part (C), the Vorbzw. Backward movement conveys the closing or opening of the shutter (/). 2. Device according to claim 1, characterized by a socket (B) with guide grooves (B ') for the slide (C), the helical part (C) of which protrudes through a slot (E') of a socket (E) and the shutter releases (A ') is applied to the camera. 3. Device according to claims 1 and 2, characterized in that the bush (JS) rotates IO bar is stored and a spring (F) takes up, which is coupled to the diaphragm ring (H) via an extended part (= adjustment arm F '). Considered publications: German Patent Nos. 627 044, 688 159, 693, 860 749;
U.S. Patent No. 2,262,509. Cited earlier rights: German patent application Sch 10342 IX / 57 a. 1 sheet of drawings © 709 756/274 10.57