Abstract: A printhead which comprises a body with pressure chambers (13) and nozzles (14), a membrane (17) connected to the body so as to form one wall of the pressure chambers, and an actuator plate (25) comprising an actuator element (31) for each pressure chamber. A support plate (19) between the actuator plate and the membrane includes first portions (21) and second portions (23) with the first portions being movable relative to the second portions in the direction of the thickness of the support plate, a first portion being situated between each actuator element and the corresponding pressure chamber. The actuator plate has active regions (31) and inactive regions (33), the actuator elements being formed by active regions of the actuator plate. Adjacent actuator elements are separated from each other over substantially their whole length by slits (35) in the actuator plate. The actuator plate can be a ceramic multilayer actuator (CMA).

Abstract: The electric lamp has a vacuumtight seal (4) on the longitudinal axis (2) of a glass lamp vessel (1). An internal (12) and an external conductor (13) each have an end (14) inside the seal (4) and extend through a common axial region (5) of the seal (4) in a spaced apart manner. Several metal foils (11) arranged in a flat plane of the seal (4) extend parallel one to the other, in a transversal direction thereof. They have knife-shaped transversal edges (15) and are welded to the internal (12) and the external (13) conductors. The current conductors (10) constituted by the foils (11), the internal (12) and the external (13) conductors are able to conduct rather high currents. The lamp, nevertheless, is of a simple, strong and reliable construction.

Abstract: The electric incandescent lamp has a tubular quartz glass lamp vessel (1) in which a filament (10) having adjoining turns is axially disposed. The filament (10) is kept centered in the lamp vessel (1) by supports (15) which are connected to the filament (10) intermediate its ends (12) and which bear against the lamp vessel (1). The turns (11) of the filament (10) are formed as polygons, and the adjacent angles of adjoining turns are angularly displaced relative to one another about the axis (2) of the lamp vessel (1).

Abstract: A liquid dosing device, comprising an open-ended vitreous capillary tube which is connected to a reservoir for liquid, heating means for heating the liquid in the reservoir to a given temperature T.sub.1, and a ceramic actuator element which is in intimate contact with a portion of the external surface of the tube. The tube and the element are mutually adhered using a solder having a melting point in excess of T.sub.1. The liquid in the reservoir may be molten solder or glue.

Abstract: An autostereoscopic display apparatus comprises a display device (10), for example a matrix LC display panel, for producing a display output consisting of rows and columns of pixels (12) and lenticular means (15) at the output side of the display device comprising an array of lenticular elements (16) through which different groups of pixels, forming one or more stereoscopic pairs, are seen by respective eyes of a viewer. The lenticular means includes electro-optic material (38) having an electrically--alterable refractive index and which can be selectively switched to remove the action of the lenticular elements thereby allowing high resolution 2-D images to be viewed.

Abstract: A discharge lamp is provided with a tubular discharge vessel having an internal diameter of at most 5 mm, with a luminescent screen, and with a filling which comprises mercury and a rare gas. The rare gas comprises more than 98 mole % neon, and the luminescent screen comprises a first group and a second group of luminescent substances, which first group comprises luminescent substances for converting UV radiation generated by mercury into visible light, and which second group comprises luminescent substances for converting the UV radiation generated by neon into visible light. The discharge lamp has a comparatively high luminous flux immediately after ignition even in cold surroundings.

Abstract: The high-pressure metal halide discharge lamp has opposite tungsten electrodes (5) carried by electrode rods (7). These rods (7) have a first portion (71) of tungsten adjacent the electrodes (5) and a second portion (72) having a core of tungsten and a skin of at least 90% by weight of rhenium. Their common boundaries are at a location having during operation a temperature in the range of 1900-2100 K. The gas filling contains metal oxyhalide and is devoid of rare earth metal compounds. The lamp has a long life and a high luminous maintenance.

Abstract: An electrodeless low-pressure mercury vapor discharge lamp includes a discharge vessel that gas-tightly encloses a discharge-space that is provided with a fill of mercury and a noble gas. The discharge vessel has a light-transmitting enveloping part and further has a sunken part in which a coil for generating a high-frequency magnetic field is arranged. At least a portion of a surface of the discharge vessel turned towards the discharge space is provided with a luminescent layer. At least a portion of the luminescent layer bears a protective layer of aluminum oxide particles with a covering weight of 10 to 500 .mu.g/cm.sup.2. The protective layer provides for a lower mercury consumption and/or a reduction in the change of colour point during lamp life.

Abstract: A scanning device for optical record carriers is provided with an objective lens (7) suitable for scanning record carriers (1, 21) having a transparent substrate (2, 23) of different thicknesses. The lens comprises an outer annular part (25) and an inner central part (26) within the annular part. Only the central part of the lens is used for forming a focus through a first substrate (2) having a first thickness. The central part is corrected for the spherical aberration of the first substrate. The annular and central part of the lens are used for forming a focus through a second substrate (23) having a different, second thickness. The annular part is corrected for the spherical aberration of the second substrate.

Abstract: Method of providing a pattern of apertures and/or cavities in a plate of material which is suitable for powder blasting, or of cutting pieces from a plate (2) of such a material by means of powder blasting, using a non-metal layer of blast-resistant material (3) as a mask which is patterned while or after it is fixedly provided on the surface of the plate.

Abstract: A capsule (20) having a glass wall (21) and containing mercury is positioned in a radiation-transmitting discharge vessel, after which the discharge vessel is provided with a rare gas and closed, means for maintaining an electric discharge are arranged in or adjacent the discharge vessel. The capsule is opened by fusion after the discharge vessel has been closed by heating the capsule by irradiation (42) with a parallel beam of radiation through the wall of the discharge vessel. The wall of the capsule has for this radiation an absorption coefficient which amounts at least ten times that of the wall portion of the discharge vessel.

Abstract: Emission-reducing shield for a display, including two glass plates. A conducting layer is present on one of the glass plates. The layer is a continuous layer so that there is no Moire effect. The shield may also have an anti-static coating and an anti-reflection coating.

Abstract: A discharge vessel (10) encloses a discharge space (12) in a gastight manner, electrodes (21a, 21b) being arranged in the space and having a first (22a, 22b) and a second fastening (22a', 22b'). At least one of the electrodes (21a) is surrounded by a screen (23) which has a smallest width W, in a plane transverse to the tube axis (11) and transverse to the direction from the first (22a) to the second fastening (22a'), which width is smaller than the distance D between the fastenings (22a, 22a'). The screen (23a) has a length L in the direction of the tube axis (11) which lies between once and three times the smallest width W. The lamp consumes comparatively little mercury in the case of cold ignition.

Abstract: Thin film interference filter consists of alternating first and second layers, the first layers being silica, the second layers being a mixture of tantala and niobia. The filter may be used on a high temperature lamp in an inert atmosphere if the niobia in the mixture is less than 40% by weight. For higher percentages a partial pressure of oxygen has been found to prevent blackening of the layers.

Abstract: The high-pressure metal halide discharge lamp comprises a quartz-glass lamp vessel (1) with an ionizable filling and two electrodes (2) which are connected to current conductors (3). The electrodes are provided with an emitter (6) which contains tungsten as a main component and at least three oxides, a first oxide which is chosen from hafnium oxide and zirconium oxide, a second oxide being lanthanum oxide, and a third oxide which is chosen from yttrium oxide.

Abstract: Method of providing a pattern of apertures and/or cavities in, for example, a glass duct plate of a plasma-addressed liquid crystal display, in which first a mechanical treatment is performed (for example, by means of powder blasting) and then a wet-chemical etching treatment is performed to render the walls of the ducts microscopically less rough so that the optical disturbance is reduced and the glass becomes clearer again.

Abstract: A microwave component is described with a substantially tub-shaped housing part which comprises a bottom portion and at least one wall portion merging into the circumference of the bottom portion, and with a lid part, said housing part and lid part being formed from a magnetically permeable material and enclosing an inner space in which a number of substantially disc-shaped components are provided in a stacked arrangement between the bottom portion and the lid part such that a partial space of the inner space adjoining at least a sub-portion of the bottom portion is left open by the stacked arrangement.A compact construction benefiting miniaturization is obtained in this microwave component in spite of the accommodation of a bulky load impedance.

Abstract: A single plate (3) is provided with a first lens structure (7) of longitudinal lenses (9) on one side. A pattern of strips (15) of a light-absorbing material is provided on the other side. The strips (15) extend parallel to the longitudinal lenses (9) in the horizontal direction when the screen is in use. The screen includes a second lens structure (19) and a diffuser on the side with the strip pattern. This vertical lens structure (19) ensures the spread of light in the horizontal direction, while the diffuser ensures the spread of light in the vertical and horizontal directions. The lenses (21) of the second lens structure (19) have a very much larger power than those of the first, horizontal lens structure (7).

Abstract: The invention relates to an image projection module (1) comprising, in this order, an illumination system (3) and an image display system (13) having at least one display panel (15) for modulating an illumination beam to be supplied by the illumination system (3) with image information. The illumination system (3) comprises an integrator system (19) having an exit surface which is located in an exit plane. First reflecting means (33; 43) are present in the exit plane of the integrator system (19) and the module (1) further comprises second, selectively reflecting means (39). An optical system (31) for at least partly imaging the exit surface via the second reflecting means on the first reflecting means is arranged between the first and the second reflecting means.

Abstract: A lever (14) is fixed to a shaft (15) which can be connected to a rotation shaft (19) of a device such as a potentiometer. The shaft (15) is journaled in a pair of support plates (10, 11) which are rigidly connected to one another, and brake discs (23) having brake linings (22) are arranged between the lever (14) and the support plates (10, 11). Cup springs (24) provide a spring force acting transversely to the operational direction of the lever (14), so that frictional forces provided by the brake linings (22) assure a smooth and jolt free operation of the lever (14).