Abstract: An optical element is manufactured by means of a mould by a replication technique including a mold that is manufactured from a ductile metal and is given a mold shape which corresponds to a pattern of sub-elements by means of a die having a die surface which corresponds to the optical sub-element and which is imprinted in the mold with a predetermined force in consecutive positions in accordance with the pattern. A workpiece holder fastened to the mold including a stepped chamber which is displaceable relative to the workpiece holder by a positioning device. The die surface imprints the sub-shape in the mold with a predetermined force substantially independent of a position occupied by the die during imprinting. The predetermined force plastically deforms the ductile metal exclusively at the area of the surface contact between the mold and the die.

Abstract: A mold of ductile metal has a shape comprising consecutive sub-shapes corresponding to respective optical sub-elements having substantially identical shapes arranged in a pattern. The mold is shaped by means of a die having a die surface corresponding to the sub-shape, which sub-shape is imprinted in the ductile metal with a predetermined force one at a time in consecutive positions in accordance with the pattern, each position corresponding to a single optical sub-element.

Abstract: The invention relates to a substrate comprising a glass sheet (1) having a thickness which is smaller than or equal to 0.1 mm, the glass sheet (1) being provided with a layer of a synthetic resin material (2) having a thickness which is smaller than or equal to that of the glass sheet (1). This substrate proves to be flexible. In addition, the substrate cracks less easily, so that it can be processed more readily. The substrate may be used, for example, in light-emitting devices, such as a poly-LED or PALC.

Abstract: The invention relates to a substrate comprising a glass sheet (1) having a thickness which is smaller than or equal to 0.1 mm, the glass sheet (1) being provided with a layer of a synthetic resin material (2) having a thickness which is smaller than or equal to that of the glass sheet (1). This substrate proves to be flexible. In addition, the substrate cracks less easily, so that it can be processed more readily. The substrate may be used, for example, in light-emitting devices, such as a poly-LED or PALC.

Abstract: The invention relates to a substrate comprising a glass sheet (1) having a thickness which is smaller than or equal to 0.1 mm, the glass sheet (1) being provided with a layer of a synthetic resin material (2) having a thickness which is smaller than or equal to that of the glass sheet (1). This substrate proves to be flexible. In addition, the substrate cracks less easily, so that it can be processed more readily. The substrate may be used, for example, in light-emitting devices, such as a poly-LED or PALC.

Abstract: A support device for a drum (1) which is provided with two journals (57, 59) projecting from the drum on either side of the drum, whose centerlines (25, 27) substantially coincide with the centerline (9) of the drum. Each of the two journals (57, 59) is journalled around an axis of rotation (61) in a bearing bush (63, 65) which is attached to a frame (67) by a ring-shaped membrane (69) positioned in a plane transverse to the axis of rotation (61). Each of the two journals (57, 59) forms part of a shaft (17, 19) projecting into the drum (1), and attached to a shell (7) of the drum by a ring-shaped plate (11). An end of a portion of each shaft (17, 19) projecting into the drum (1) bears on adjustment devices (41, 43, 49) by which the relevant shaft (17, 19) with journal (57, 59) can be swivelled relative to the centerline (9) of the drum (1).

Abstract: A machine tool comprising a third carriage which is guided along a circular cylindrical guide of a second carriage by means of a static fluid bearing and which can thus rotate about an axis of rotation which coincides with a centerline of the circular cylindrical guide. A working point of a tool fastened to the third carriage lies on the axis of rotation so that an angular adjustment of the tool effected by rotation of the third carriage can take place independently of a position adjustment of the working point effected by a displacement of the second carriage and a first carriage. The machine tool can be used for the processing of surfaces, in particular in the manufacture of linear and circular Fresnel lenses for projection television screens by means of a cutting tool.

Abstract: A method of manufacturing a master for projection screens, according to which a pattern of parallel rectilinear grooves and ribs is formed on one side of a plate of machinable material by a slotting operation performed by means of a profile chisel. The grooves (33) are formed in several different tooling steps, with several grooves being tooled simultaneously. The profile chisel is of multiple construction and is composed of three subchisels, i.e. a precutting chisel, a cutting chisel (13) and a finishing chisel.

Abstract: A method of manufacturing a master for projection screens, according to which a pattern of parallel rectilinear grooves (31) and ribs (31) is formed on one side of a plate of machinable material by a slotting operation performed by means of a profile chisel. The grooves (33) are formed in several different tooling steps with, several grooves being tooled simultaneously. The profile chisel is of multiple construction and is composed of three subchisels, i.e. a precutting chisel, a cutting chisel (13) and a finishing chisel.