Abstract: The invention relates to an electronic device having a housing, which has a housing wall with openings for control elements and/or display elements. An external wall element, which at least partially covers the housing wall, is detachably connected to the housing. The external wall element has openings which are aligned with the openings in the housing wall. As a result, by using different external wall elements the external appearance of the electronic device can be easily modified.

Abstract: In an optical spectrum analyzer, the respective wavelength bandwidths of the optical spectrum analyzer are determined at the wavelengths of the reference lines and used as calibration data for determining measurement tolerances by means of reference lines of known wavelength and known wavelength bandwidths from the known wavelength bandwidths of the reference lines and from the wavelength bandwidths of the reference lines measured with the optical spectrum analyzer

Abstract: An electronic radiotelephone comprising: a first housing; a second housing releasably attachable to the first housing to meet with the first housing around the periphery of the radiotelephone; and retaining means comprising a cover for holding the electronic components of the radiotelephone to the first housing when the second housing is released from attachment with the first housing.

Abstract: Electronic organiser (10) with a calendar (11) in which appointments at least according to date, time and an individual description, for example a person to be visited, are variable. If the organiser (10) is provided with an interface (22) which can exchange data in respect of the appointments with an interface (22) existing on another device (21), the data recorded in the calendar (11) can be used to run the other device or the electronic organiser (10) can be controlled by the other device. Thus for example data recorded in the calendar (11) can be used by a navigation system for faster input of the destination, or for example departure appointments can be changed by the other device according to the traffic or other situations.

Abstract: The invention relates to an electronic device having a housing (1) which has a housing wall (5) with openings (7) for control elements (8) and/or display elements (9, 10). Attachment device (11) for detachably connecting to the housing (1) an external wall element (14) which at least partially covers the housing wall (5) being present on the housing (1), the external wall element (14) having openings (7′) which are aligned with the openings (7) in the housing wall (5). As a result, by using different external wall elements (14) the external appearance of the electronic device can be easily modified.

Abstract: In a light waveguide, the one end of which comprises a flat entering area for the light to be coupled into the core of the light waveguide, the entering area is narrower than the core diameter of the light waveguide and, around the entering area, the end of the light waveguide is laterally sloped up to the entering surface. Only the light which impinges on this entering area passes into the core and is guided therein.

Abstract: The present invention discloses an input device for providing data input comprising a moveable element, the moveable element is capable of rotating about an axis of rotation and displacement orthogonal to the direction of rotational movement, means for detecting said rotation and means for detecting said orthogonal displacement and means for translating said rotation and said orthogonal displacement into signals indicative of respective data inputs.

Abstract: The invention relates to an electronic device having a housing (1) which has a housing wall (5) with openings (7) for control elements (8) and/or display elements (9, 10). Attachment means (11) for detachably connecting to the housing (1) an external wall element (14) which at least partially covers the housing wall (5) being present on the housing (1), the external wall element (14) having openings (7′) which are aligned with the openings (7) in the housing wall (5). As a result, by using different external wall elements (14) the external appearance of the electronic device can be easily modified.

Abstract: Screening device against electromagnetic radiation, having a thin structural unit (2) which extends in a plane and is provided with walls (3) running essentially perpendicular to the plane, whereas the walls (3) themselves, at least in partial regions, are elastically deformable in the direction of the structural unit (2).