摘要:
An optical component includes an anisotropic layer of cross-linked liquid crystal monomers with varying local orientation of the liquid crystal molecules. The liquid crystal layer is in contact with an orientation layer comprising a photo-orientable polymer network (PPN). A method of making includes orienting the liquid crystal monomers by the interaction with the PPN layer and subsequently fixing the molecules by cross-linking.
摘要:
A tracheal stent 1 is comprised from a plastic shaft 2 and metal clasps 5 which grasp the plastic shaft 2 ventrolaterally. The plastic shaft 2 is, cranially, lengthwise oval in cross section and, caudally, squarish-oval. It is comprised from thin highly-elastic and stable sheet and from clasps 5, whereby the clasps 5 are bound to the sheet. The clasps 5 can, in a first manifestation, be sufficiently compressed together over their free ends 6, 7 that the plastic shaft 2 is given as small an outer circumference as possible. In a second manifestation, the clasps 5 can be spread out by, for example, being heat activated. A stably-shaped and, in section 7', highly-elastic lumen 8 is formed in plastic shaft 2 which largely corresponds to the size of a lumen of a natural trachea.
摘要:
The polarizer comprises a layer of cholesteric liquid crystal with Grandjean structure disposed in the path of the light and in which the light in a given wavelength range is reflected with selective and circular polarization or is transmitted with reversed direction of rotation, and a mirror which reversed the direction of rotation of the circular- polarized light. The component reflected by the mirror is also transmitted. If the liquid crystal layer is concentric with the source of natural light and the mirror is spherical, the result is a source of circular polarized light. A projection system is obtained by a combination of two of the aforementioned polarizers, one serving as a polarizer and one as an analyzer, and an interposed liquid crystal display cell for modulating the intensity of the polarized light.
摘要:
The present invention relates to cylinder head gaskets on internal combustion engines, with at least three layers, namely a mid-layer, a function layer and a layer of a compression limiter. The mid-layer is arranged between the function layer and the compression limiter. The mid-layer has at least two essentially round fixing openings, outside a sealing region. The compression limiter is beaded around the edges of the fixing openings in the region thereof, and in this way fixes the compression limiter to the mid-layer. The function layer has recesses in the region of the fixing openings of the mid-layer, in order to accommodate the beaded region of the compression limiter, without increasing the total thickness of the gasket in the region of the fixing of the compression limiter.
摘要:
The present invention relates to mesogenic, cross-linkable mixtures comprising (i) a cross-linkable liquid crystalline host compound comprising at least one cross-linkable liquid crystalline compound, and (ii) at least one chiral or achiral rod shaped additive component, wherein said additive component has a rigid core and comprises at least two fused or linked, optionally substituted, non-aromatic, aromatic, carbocyclic or heterocyclic groups, and also comprises at least one optionally substituted alkyl residue, and at least one polymerizable group and wherein the additive component has a transition temperature to the isotropic state of 40° C. or lower. The invention also relates to the novel chiral or achiral rod-shaped additive compounds used for the preparation of these mixtures, to mixtures according to the invention in form of an elastomer, polymer gel, polymer network or polymer film, to polymer networks and liquid crystalline polymer films prepared from these mixtures and to optical or electrooptical components comprising polymer networks and liquid crystalline polymer films prepared from such mixtures. Further, the invention relates to the use of the chiral or achiral rod shaped compounds as components of a cross-linkable liquid crystalline mixture in the production of orientated liquid crystalline polymers, to liquid crystalline mixtures comprising these compounds, to liquid crystalline polymers and liquid crystalline polymer networks prepared from such liquid crystalline mixtures, and to liquid crystalline devices comprising these compounds.
摘要:
Disclosed is a method for mechanically connecting flat seals comprising at least two layers. In said method, the individual layers are placed in the area of a tool, at least one punch that has an approximately circular cross-section partially cuts the layers at defined points of the respective connection zone, and at least some of the remaining material is deformed outside the respective cut zone to form bent zones such that the respective cut zone is round and the respective bent zone is straight. Burrs of at least one of the layers are effectively connected to the material of at least one other layer in order to form a removable clamping connection, said burrs being formed in the cut zone.
摘要:
The invention relates to a metal cylinder head gasket provided with at least one opening corresponding to a combustion chamber of an internal combustion engine, comprising a function layer and an annular support arranged thereon. The functional layer comprises one full bead. The cylinder head gasket is characterised in that the annular support comprises one full bead which is defined on the functional layer, and the annular support comprises one bead which is arranged on the side of the full bead which is oriented away from the combustion chamber The invention also relates to a metal cylinder head gasket provided with at least one opening corresponding to a combustion chamber of an internal combustion engine, comprising an upper functional layer, an annular support and a lower functional layer. The annular support is arranged between the upper functional layer and the lower functional layer and is adjacent to the lower functional layer. The upper functional layer comprises one full bead which is adjacent to the annular support. The cylinder head gasket is characterised in that the lower functional layer comprises one bead which is arranged on the side of the full bead which is oriented away from the combustion chamber.
摘要:
In an inventive stent (10), helical filaments (12, 13) are disposed on a first tubular layer (11). The helical filaments (12, 13) are mutually phase-shifted such that they do not touch and lie in one plane. The helical filaments (12, 13) are completely coated by a second elastic tubular polymer layer (14) which is connected to the first elastic tubular layer (11). Further helical filaments may be disposed on the second elastic tubular layer (14). The inventive stent can be lengthened for introduction into a hollow organ and is self-expanding.
摘要:
A joining method head is proposed for fixation to a movable frame, in particular to a robot, having a holding means for an element to be joined to a part, a joining drive means to move the holding means along a joining direction for joining, and a feeding means for feeding elements to the joining method head. Here a control means to control the joining drive means is arranged at the joining method head spatially distanced from the holding means and the joining drive means, so that the holding means and the joining drive means form a joining tool of small dimensions, and means are provided to pass on the elements fed to a transfer station of the feeding means in each instance to the holding means from in front.
摘要:
A fastening device for fastening a small component, in particular a stud provided with an adhesive flange, to a mounting surface using a heat-activated adhesive that creates an adhesive bond between the component and the mounting surface, has an induction coil to heat the component and/or the adhesive and a holding mechanism which holds the component while the fastening device moves to the bonding position. On the side facing the mounting surface is a bearing surface for the component toward which the component can be brought from outside. The holding device can be advanced to the component by the induction coil and has an electromagnet for generating a holding force that is directed toward the bearing surface.