DE7135758U - ENLARGEMENT DEVICE - Google Patents

Description

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ELBE CAMERA SOCIETY

WITH RESTRICTED « £ ZL

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DDR-WP 155 691 / G 03 β T.tO.6.1971 Enlarger

The invention relates to an enlarger for photegra-

"phical purposes with a transverse to the optical axis misaligned

k or swiveling and feat-adjustable lens mounts with min-

at least two lenses with different focal lengths

Such devices are known per se and have been made the secure fixation of the lens carrier * after

the objective has been swiveled or pushed into the beam path, either by clamping a corresponding clamping device or by means of ratchet devices by means of catches, ball catches or the like. These known devices are relatively expensive and tend to tension the two parts to be connected or, as a result of the spring forces acting on the locking devices, the entire device is displaced when they are overcome.

The purpose of the invention, these disadvantages with the ^simplest: avoid funds.

The object of the invention is to secure the position of the ver slidable or verachwenkbaren lens carrier with a low adjustment force from the holding area in the movement of the-

;: to ensure the same.

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The invention solves the problem in such a way that the lens carrier in the end positions of its displacement or pivoting movement. arch magnets is held. According to the invention is right and left of the lens carrier in the direction of movement of the same attached to a fixed frame or on the frame of the enlarger ever a magnet adjustable, wherein an air gap between the magnet and the lens mount can be adjusted in a manner known per se, e.g. by means of adjusting screws.

The advantages resulting from the invention are a simple and clear structure of the holding device for the lens carrier with the elimination of special operating handles for releasing a pawl or overcoming a spring force acting on the locking device. On ^G about the fact that during the displacement path of the lens Slower the Führungebahnen thereof no latching and retaining forces are applied, is ensured a particularly light, no disturbance occasion giving adjustment of the lens wearer.

The invention is illustrated and described using exemplary embodiments.

To a perpendicular to the optical axis 0 longitudinally displaceable Whether jektivträger 1, two lenses 2 and 3 of different 8vans "ELTE are arranged which for joint adjustment • ttf sharpness ait a Zwisohenrad 4 are connected. With lens mounts, right and left are transverse to movement

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direction of the same each a leg 5 and 6 connected, which slide the lens carrier 1 on guide rods 7 and 8, which uzw in the fixed frame. Frame 9 of the ^v ergröße- # rungsgerätea are fixed slide blank. To move the lens ^{carrier 1 a G} handle piece 10 is provided on this, which leads through vain slot 11 located in the housing wall 9 to the outside.

As a holding device for the lens carrier 1 in its ends 1 lungs, two adjustable ones attached to the frame 9 are used Magnets 12 and 13. In order to form the air gap 14 between the magnets 12 or 13 and the legs 5 or 6, in as is known, either the magnets 12; 13 in the direction of the arrow be set, or there are adjustable screws 15; 16 provided, which limit the displacement of the lens carrier 1 depending on the required actuating force.

The operation of the holding device for the lens carrier is such that shortly before the end of the sliding movement of the Lens carrier a 1, depending on its position, one of the magnets 12 or 13 pulls the leg 5 or 6 towards one of the adjustable stops 15 or i6 and thus the lens carrier 1 according to the set air gap 14 holds more or less.

The invention is in no way limited to the above Embodiment. It is quite conceivable that the recording camera β or reproduction devices with several lenses Magnetic holding device according to the invention is used

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Claims (3)

1. Enlarger for photographic purposes with a Objective carrier that can be displaced and locked transversely to the optical axis with at least two different objectives Licher focal length, characterized in that the Objek tivträger in the end divisions of its "sliding movement is held by magnets. 2. Magnifying device according to claim 1, characterized in that on the right and left of the lens carrier in motion direction of the same on a fixed frame or a magnet is attached to the frame of the enlarger in an adjustable manner. 3. Magnifying device according to claims 1 and 2, characterized in that one between the magnet and lens carrier located air gap is adjustable in a known manner by adjusting screws. ELBE-KAMERA- SESELLS CHAPT with limited liability