Abstract: A display device, particularly for the display of music titles in a jukebox includes a frame housing, two juxtaposed stacks of information carriers arranged vertically one behind the other, with a front information carrier of a first one of the stacks of information carriers and a rear information carrier of a second one of the stacks of information carriers being simultaneously displaceable by a displacing mechanism relative to one another toward the respective other stack of information carriers. In order to displace the respective front and rear information carriers, the two stacks of information carriers are movable by the displacing mechanism relative to one another in synchronized steps and offset by the thickness of an information carrier. The direction of movement of the movable and displaceable information carriers is reversible by a reversing mechanism. The information carriers of each stack of information carriers are supported at edges thereof in the threads of threaded spindles.

Abstract: A front component of a varifocal camera objective, axially shiftable for focusing purposes, is provided with a lens mount held by an axially extending guide rod which is slidably received in an inner annular flange and an end wall of a lens barrel. The lens mount has a pin projecting through an axial guide slot in the lens barrel into a camming groove in a surrounding milled setting ring. A rearward extension of the guide rod, nonrotatable but axially slidable with reference thereto against the force of a tension spring, is provided with male threads engaged by a drive nut held captive in the end wall, the nut being provided with outer gear teeth meshing with a pinion which is driven by a reversible electric motor via a slipping clutch.

Abstract: A camera housing carries an objective whose optical axis O is tiltable and/or transversely shiftable with respect to a reference line A passing centrally through an exposure window for adjusting the position of an object plane and/or eliminating perspective distortion with shots taken at certain angles. A presettable iris diaphragm and an adjoining shutter in the lens assembly of the objective are tripped, at the instant of exposure, by a deformable linkage in the shape of an articulated or flexible shaft extending generally parallel to the optical axis from the housing to the objective.

Abstract: An iris diaphragm of a reflex camera, spring-biased into a wide-open position, is settable to a preselectable stop position via a linkage including a cam follower on an integral extension of a resilient swing ring oscillatable about an off-axial fulcrum. The cam follower coacts with a cam disk which is manually rotated against the force of a restoring spring during a windup operation and, upon subsequent release, displaces the cam follower and the swing ring which entrains the setting ring of the diaphragm through a yieldable coupling to the selected stop position and restores it to the wide-open position in the course of a revolution. During windup, a beveled flank on the high dwell of the cam disk axially displaces the extension of the swing ring which is thereby made ineffectual and prevented from reducing the diaphragm aperture.

Abstract: An iris diaphragm of a reflex camera, spring-biased into a wide-open position, is settable to a preselectable stop position via a linkage including a cam follower on a swing ring oscillatable about an off-axial fulcrum. The cam follower coacts with a cam disk which is manually rotated against the force of a restoring spring during a windup operation and, upon subsequent release, displaces the cam follower and the swing ring which entrains the setting ring of the diaphragm through a yieldable coupling to the selected stop position and restores it to the wide-open position in the course of a revolution. During windup, a beveled flank on the high dwell of the cam disk oscillates the swing ring and entrains the setting ring for another brief but ineffectual reduction in the diaphragm aperture.

Abstract: Iris leaves for optical components such as diaphragms or shutters are injection-molded, together with integral pivot pins, of thermoplastic resin which is given a mat appearance by a roughening of the mold-cavity surfaces. In the case of a composite leaf consisting of two legs articulated to each other, each leg is a curved foil whose cross-section tapers from its convex to its concave edge to facilitate relative swinging of the legs. The mold cavities are duplicated in confronting surfaces of coacting mold halves and open into deeper sprue channels whose junctions with the cavities are formed by converging slots in shearing bolts that are guided in transverse bores encroaching upon the convex cavity edges, a displacement of these shearing bolts by a distance greater than the foil thickness severing the molded leaves from the runners before the mold is opened.

Abstract: Iris leaves for optical components such as diaphragms or shutters are injection-molded, together with integral pivot pins, of thermoplastic resin which is given a mat appearance by a roughening of the mold-cavity surfaces. In the case of a composite leaf consisting of two legs articulated to each other, each leg is a curved foil whose cross-section tapers from its convex to its concave edge to facilitate relative swinging of the legs. The mold cavities are duplicated in confronting surfaces of coacting mold halves and open into deeper sprue channels whose junctions with the cavities are formed by converging slots in shearing bolts that are guided in transverse bores encroaching upon the convex cavity edges, a displacement of these shearing bolts by a distance greater than the foil thickness severing the molded leaves from the runners before the mold is opened.

Abstract: A varifocal objective with two independently movable components is adjustable by a reversible master motor positively coupled with a screw drive for one component and with a movable part of a position sensor which emits pulses of varying density during displacement of that component for the stepping of a reversible slave motor driving the other component according to a predetermined positional relationship. The position sensor may comprise a movable scanner, e.g. a slotted disk, coacting with a fixed carrier of optically readable markings such as a glass rod; alternatively, it may include a movable signal carrier such as a perforated tape coacting with a stationary reader. If the second component is to move bidirectionally upon unidirectional displacement of the first one, the carrier is provided with a supplemental track coacting with a separate pick-up head to control a reversing switch in the operating circuit of the slave motor.

Abstract: To shift the movable lenses of a verifocal objective, or to adjust the leaves of an iris diaphragm, a flat or cylindrically curved control element is formed with camming grooves coacting with projections on the controlled members. The control element is a deformable foil, e.g. of sheet metal, in which the camming grooves are formed by deep-drawing. The foil rests against a backing element with which it is positively connected by a tongue-and-groove coupling or the like and which entrains the control element upon being rotated about their common axis by an external force.