Abstract: The display screen of an electronic viewfinder displays camera setting information components outside the screne image, so that a camera operator can check the camera settings and possibly modify them to desired values without having to look away from the scene image. In the camera according to the invention, the sound recording level is displayed in the viewfinder as a bar whose length varies logarithmically. A stable presentation of the sound recording level is the result.

Abstract: The invention relates to a charge-coupled device, more particularly a sensor operated by the so-called accordion principle, in which the charge packets are stored with a very high density. In order to prevent signal mixing, charge pockets are transported with a lower density. The logic circuits required for driving the sensor are integrated in the chip itself.

Abstract: A device for positioning an optical fiber with respect to a defined reference plane. The optical fiber is arranged so as to be displaceable with respect to the reference plane by an electro-mechanical deflector device comprising three pairs of deflector elements which are arranged like parallel leaf springs.

Abstract: The device includes a first connector housing (7) in which end portions of a number of optical fibres (1) are secured and a second connector housing (11) in which a corresponding number of optical elements to be connected to the fibres, for example end portions of further optical fibres (3), is secured. After the connection has been established, the two connector housings (7, 11) are detachably coupled by means of a locking device which includes a first locking portion (17) which is provided at the first end (16) of a lever (15) provided on the first connector housing (7) and a second locking portion (18) which cooperates with the first locking portion and which is provided on the second connector housing (11). In order to establish also an electrical connection between pairs of conductors (35, 41), an electrical contact member (27, 37) is provided near each of the two locking portions (17, 19).

Abstract: An optical transmission system comprises a monomode optical transmission fibre which has an end portion in which the diameter of the core tapers toward the end. If the tapered portion is followed by a part of increasing diameter this results in a better matching to the wavefront which issues from the lens arranged in front of or on the fibre. This yields a higher coupling efficiency.

Abstract: A magnetic head for a magnetic recording and playback device. The head comprises a Mn-Zn-ferrous ferrite core having a very high saturation magnetization and magnetic permeability. The Mn-Zn-ferrous-ferrite has a composition according to the formulaMn.sub.a Zn.sub.b Fe.sub.c.sup.II Co.sbsb.xFe.sub.2.sup.III O.sbsb.4with0<a.ltoreq.0.550.06.ltoreq.b.ltoreq.0.40.34.ltoreq.c.ltoreq.0.90.0006.ltoreq.x.ltoreq.0.006.

Abstract: Array of Fresnel lenses moulded in a single sheet of plastic 29 are used in conjunction with a thermal radiation detector 1 to provide intruder alarm apparatus. Each lens defines one detection direction in a fan of such directions 26,27,28. Such arrays have been moulded as a curved surface 22 centered on the detector. To reduce moulding costs while maintaining the optical efficiencies of all lenses in the array, a flat array of lenses is provided in which each lens is moulded as an angled facet 30,31,32. The poles 36,37,38 of the lenses lie in a plane.

Abstract: The inside of a tube of an electrically insulating material is coated with a layer of electrically insulating material by reactive deposition of the coating material from a gas mixture which is passed through the tube. The tube is heated and the deposition is activated by a plasma produced by microwaves. The plasma reciprocates in the tube. Energy consumption is reduced by heating the tube to the reaction temperature at least partly by the energy supplied by the plasma to the tube wall. Thermal losses of the tube are reflected back to the tube wall by a heat reflecting element.

Abstract: A geodesic optical component consists of a light-guiding layer on a substrate. The substrate has a surface corrugation which determines the optical function of the component. Since the surface corrugation has a wavelike character, it is possible to obtain the desired optical function while limiting the maximum depth or height of the corrugation, so that the component can be accurately produced using inexpensive pressing or etching techniques.

Abstract: Planar optical waveguide having a crystal body consisting of a nonmagnetic substrate having a first magnetooptical layer epitaxially provided on the substrate and a second magnetooptical layer epitaxially provided on the first mangetooptical layer. The two magnetooptical layers consist of a material based on iron garnet. The second magnetooptical layer has a refractice index n.sub.2 which is approximately 1.times.10.sup.-3 to 1.times.10.sup.-2 higher than the refractive index n.sub.1 of the first magnetooptical layer. A layer of a material based on iron garnet and absorbing radiation in the wavelength range of 1.0.ltoreq..lambda..ltoreq.2.5 .mu.m is provided between the substrate and the first magnetooptical layer, said iron garnet-based layer having a refractive index n.sub.A which is higher than the refractive index of the first magnetooptical layer.

Abstract: A method of manufacturing a terminal device by the steps of locking an afocal system, which is formed by a ball lens and an opto-electronic element, to the bottom of a housing, and centering central aperture of a diaphragm with respect to the ball lens. Subsequently, using a mechanical guiding operation by means of a pin, the micro-component thus formed is positioned with respect to a reference surface of a base. The terminal device thus obtained is capable of receiving an optical fiber in its central aperture without further alignment being required.

Abstract: In order to simply attach an optical fiber in a wall, the end porton of the fiber is enclosed by a tubular envelope. The envelope is accommodated in a holder which projects through an opening in the wall. The holder is rotatable about its longitudinal axis. The outer cylinder surface of the holder is provided with a circumferential groove. In two diametrically opposed portions, the depth of this circumferential groove is greater than the thickness of the wall of the holder so that two elongate openings are formed in the wall of the holder. The outer surface of the tubular envelope is also provided with a circumferential groove whose axial position coincides with that of the circumferential groove in the holder. A U-shaped spring is attached to the wall so that its legs are situated in the circumferential groove in the holder at the area of the elongate openings.

Abstract: A magnetooptical recording element has a substrate bearing a magnetooptical recording layer. The recording layer is crystalline and comprises a compound of the formula R.sub.2 T.sub.14 B, wherein R is a rare earth metal or a combination of two or more rare earth metals, and T is a transition metal or a combination of two or more transition metals, in particular Fe or Co or a mixture thereof. A magnetooptical recording device comprises such a magnetooptical recording element.

Abstract: An electron tube comprising a window having a radiation-sensitive layer. The window is laid on a bearing surface of an envelope normal to the tube axis. There is no sealing material in the seam between the bearing surface and the window. The seam is sealed hermetically by a mass of indium or an indium alloy in which a metal wire is embedded along the circumference of the seam. The wire can be soldered with indium or an indium alloy. The seal is made by locally melting the indium or the indium alloy by a heated ultrasonically vibrating heat transfer member. The heat transfer member traverses the circumference of the seam.

Abstract: In an opto-mechanical scanner with associated scanning and ranging functions the scanning beam, obtained by line-scanning means and frame-scanning means, and the ranging beam converge on a scanning detector array and on a ranging detector, respectively. According the invention, the scanning and ranging beams traverse an arrangement of fixed optical elements which are arranged to ensure that the beams follow two different optical paths in such a way that the ranging beam traverses the line-scanning means two times. This ensures that the ranging beam has a fixed orientation which is independent of the line-scanning means.

Abstract: A color television camera has an optical color separation system provided in an optical path for scene light so as to produce pictures of different colors on pickup areas of pickup elements. The scene light extends along optical axes in the system which are central axes of the pickup areas. To synchronize picture signals so that picture coverage is optimized on the joint display thereof, the camera comprises a test image projector and an adjusting circuit. So as to obtain a compact optical system without using a movable reflecting surface for the test image, which surface would be moved in and out of the optical path, the light of the test image is projected at an oblique angle with respect to the optical axes into the color separation system and strikes the pickup areas at an oblique angle. Optical imaging errors produced thereby are precompensated. Optical precompensation means are provided in the form of an obliquely arranged test image slide and a cylindrical plano-convex correction lens.

Abstract: The invention relates to an optical time-domain reflectometer (OTDR) using heterodyne reception for determining the attenuation of an optical fiber guide by measuring the backscattered portion of light pulses launched into the fiber. The reflectometer comprises a light source whose light is split into a local-oscillator beam and a measuring beam. The measuring beam is pulsed by an acousto-optical modulator (AOM) and is then launched into the optical fiber to be tested. The measuring beam thus has a frequency which is offset from the optical frequency by an acoustic frequency. The local-oscillator beam and the back-scattered portion of the measuring beam are both directed to an optical receiver producing an electric output signal. A component of the output signal has a frequency corresponding to the acoustic frequency. The time-dependent amplitude of this component is a measure of the length-dependent attenuation of the optical fiber.

Abstract: An electrooptical device comprises a semiconductor laser to which a plurality of optical transmission fibers are coupled. An input transmission fiber and at least one output transmission fiber are combined to form a tapered common fiber end portion. The common end portion has a transverse dimension on the order of that of a single transmission fiber. By coupling this end portion to one radiation-emitting surface of the semiconductor laser, a standard laser package may be employed and several new uses become feasible in practice.

Abstract: A coupling member between an input light wave guide transporting a main light beam and secondary light wave guides each transporting a part of the intensity of the main light beam. The coupling member is monolithically integrated with the wave guides on a semiconductor substrate. The coupling member comprises a plate having parallel surfaces perpendicular to the plane of the substrate. The plate has a refractive index different from that of the main light wave guide. The parallel surfaces of the plate form interfaces separating the propagation medium of the wave guides (I, R, T) from the propagation medium constituted by the plate.

Abstract: The end portions of optical fibers to be connected are accommodated in envelopes having a circularly-cylindrical outer surfaces. A connector includes a coupling sleeve with a central cavity which extends in a longitudinal direction. The central cavity is shaped as a prism having a triangular cross-section. An inscribed circle has a diameter which is smaller than the diameter of the outer surfaces of the envelopes. The walls of the central cavity are formed by free end portions of three leaf springs. The non-free ends of the leaf springs are regularly distributed around the circumference of the coupling sleeve and are secured to the wall of a housing which encloses the central cavity. The planes of the leaf springs enclose angles of approximately 60.degree. with respect to each other. When the envelopes are inserted into the central cavity, the three springs of the central cavity are independently deflected outward, so that the two outer surfaces are clamped in the central cavity with their axes aligned.