Abstract:
A ventilation device for the discharge pipe for removing a flow medium pumped to a household appliance. A pipe ventilation valve is connected to the discharge pipe by a channel and comprises a valve body disposed in a float chamber filled with a working medium which is separated from the flow medium and actuates the valve body. The valve body is actuated by transmitting a pneumatic force between the flowing medium and the working medium of the float chamber or between the flowing medium and a sealing surface adjacent to the valve body by means of a pressure medium which is separated from the flowing medium and is enclosed in the channel. The inventive pipe ventilation device makes it possible to avoid a direct contact between the valve body of the pipe ventilation valve and the flowing medium, thereby preventing the valve body from being soiled.
Abstract:
An active retina implant has a multiplicity of pixel elements that convert incident light into electric stimulation signals for cells of the retina with which stimulation electrodes are to make contact. Each pixel element is provided with at least one image cell that converts incident light into electric signals, there being provided at least one amplifier whose input is connected to the image cell and whose output is connected to at least one stimulation electrode to which it supplies a stimulation signal. Also provided is an energy supply which provides externally coupled external energy as supply voltage for the image cells and the amplifiers. The image cell has a logarithmic characteristic according to which incident light of specific intensity is converted into electric signals of specific amplitude. The stimulation signal is supplied in the form of analog voltage pulses of specific pulse length and pulse spacings, the pulse amplitude being a function of the intensity of the incident light.
Abstract:
The invention relates to an intracorporeal probe (10), for example preferably for examining hollow organs or natural or artificially created body cavities in the human or animal body, the probe (10) being designed in the form of a capsule that can be introduced into the body without external connecting elements, comprising an elongate housing (16) and an image pickup unit (26) inside the housing (16) that is designed for optically recording a region (pickup region) outside the probe (10). The image pickup unit (26) is held in a fashion capable of moving inside the housing (16) in order to vary the pickup region by means of such a movement (FIG. 1).
Abstract:
An optically controllable microelectrode array for stimulating cells within a tissue is disclosed. The array comprises a substrate having a surface. The substrate is adapted to be placed on the tissue with the surface adjoining the cells. The substrate further comprises a plurality of electrodes on the surface in contact with the cells for stimulating the cells. The electrodes are dimensioned such that a first surface area on the electrodes in contact with the cells is essentially smaller than a second surface area on the cells in which the cells may be contacted by the electrodes. An electrical stimulus is exerted from the electrodes to the cells under the control of light impinging on the tissue.
Abstract:
The invention relates to an intracorporeal probe (10), for example preferably for examining hollow organs or natural or artificially created body cavities in the human or animal body, the probe (10) being designed in the form of a capsule that can be introduced into the body without external connecting elements, comprising an elongate housing (16) and an image pickup unit (26) inside the housing (16) that is designed for optically recording a region (pickup region) outside the probe (10). The image pickup unit (26) is held in a fashion capable of moving inside the housing (16) in order to vary the pickup region by means of such a movement (FIG. 1).
Abstract:
A circuit arrangement for generating light-dependent and temperature-dependent signals has a number of first and second sensor elements, which generate a number of first and second electrical signals. The first and second electrical signals depend on electromagnetic radiation impinging on the circuit arrangement. The first sensor elements are designed to generate the first electrical signals in a manner dependent on electromagnetic radiation from a first wavelength range which comprises a substantial part of the visible light. The second sensor elements are designed to generate the second electrical signals in a manner dependent on electromagnetic radiation from a second wavelength range which predominantly comprises infrared radiation. The first wavelength range overlaps the second wavelength range and it therefore also comprises infrared radiation.
Abstract:
The present invention relates to a retina implant for the functional electrostimulation of a retina as a function of incident light. The retina implant has a stimulation chip that is designed to be implanted in the area of the retina of an eye. It further includes a radiation receiver that provides energy for the stimulation chip as a function of invisible radiation that occurs. In accordance with one aspect of the present invention, the radiation receiver is designed so as to be implanted in the area of the eye in a fashion spatially separated from the stimulation chip. The stimulation chip also has decoupling means in order to separate invisible scattered radiation from impinging visible light.
Abstract:
A steering knuckle structure that makes it possible to produce a light weight steering knuckle from a light metal alloy with a high degree of rigidity. A bracket for fixing a telescopic strut is provided at a vertically extending bracket wall which is supported by a bridge and wherein the area between the bridge and the bracket wall is open in a peripheral direction of the hub of the steering knuckle.
Abstract:
A process for the preparation of pure magnesium oxide, especially suitable for the preparation of refractory products, from magnesium silicate and magnesium hydrosilicate materials such as olivine, serpentine, garnierite, or the like, the starting material being decomposed (digested) with hydrochloric acid, the residues being separated from the decomposition slurry and the sesquioxides to be regarded as contaminants and other contaminants being precipitated from the crude brine thus obtained by the addition of crude serpentine as a pH increasing substance, the precipitates being separated and the magnesium chloride solution thus obtained being subjected to thermal decomposition, particularly by spray calcination, whereby magnesium oxide is obtained and hydrogen chloride is recovered.
Abstract:
A template to form the characters to be written is placed between the light source and the record carrier. The template is formed as a light-switching mask the switching elements of which can be controlled by a character generator. The switching elements may be arranged separately beside each other or in matrix form in accordance with the fact whether the characters are to be written per line or per page. Printing in color is also possible. The optical printer combines the functions of a printer, a picture memory and a display.