Abstract: An electronic control module to monitor and control various functions and conditions of a mower, and to display information about such functions and conditions to the operator of the mower. Information is accepted from a variety of switches and sensors on the various components of the mower, and information about certain mower functions can be displayed by means of LEDs or a LCD on a display module, which may be integrated with the central control module.

Abstract: A slow wave circuit (10, 110) of a traveling wave tube includes a three-dimensional conductive structure (30, 130). A dielectric film (36, 136) coats selected portions of the three-dimensional conductive structure (30, 130). An outer housing (12, 14, 112, 114) surrounds the three-dimensional conductive structure (30, 130) . The outer housing (12, 14, 112, 114) includes interior surfaces that connect with the dielectric film (36, 136). In a method for generating or amplifying microwave energy, a three-dimensional conductive structure is laser micromachined to define a selected generally periodic pattern thereon. The conductive structure is arranged inside a generally hollow barrel. An electron beam passes through the generally hollow three-dimensional structure and interacts with the conductive structure and the generally hollow barrel to generate or amplify the microwave energy.

Abstract: The disclosure relates to a sub-millimeter backward wave oscillator. More specifically, the disclosure relates to a miniature backward wave oscillator having a biplanar interdigital circuit. In one embodiment the interdigital circuit includes diamond and is coated with an electro-conductive material.

Abstract: The present invention is directed in one aspect to methods of making free-standing, internally-supported, three-dimensional objects having an outer surface comprising a plurality of intersecting facets wherein a sub-set of the intersecting facets have a diamond layer of substantially uniform thickness. The diamond layer may be formed by chemical vapor deposition (CVD) over the surface of a substrate that has been fabricated to form a mold defining the sub-set of intersecting facets. A backing layer may be formed over at least a portion of the exposed diamond layer to enhance the rigidity of the layer when the substrate is removed.

Abstract: An electron gun (10) includes an electron multiplier (22, 22′, 22″, 110) has a receiving end (50, 50′, 50″) for receiving primary electrons and an output end (54, 54′, 54″) that emits secondary electrons responsive to primary electrons arriving at the receiving end. An electron emitter (20, 20′, 20″, 102) is arranged at the receiving end of the electron multiplier for supplying primary electrons thereto. At least one of an electrical and a magnetic focusing component (14, 16) is arranged at the open output end of the electron multiplier for focusing the secondary electrons to define an electron beam. In a suitable embodiment, the electron multiplier includes a generally conical substrate (74, 90) and an electron mirror (52, 521, 522, 523, 921, 922) including a high secondary electron yield film (70) disposed on an outer surface of the conical substrate.

Abstract: A slow wave circuit 10, 110) of a traveling wave tube includes a three-dimensional conductive structure 30, 130). A dielectric film 36, 136) coats selected portions of the three-dimensional conductive structure 30, 130). An outer housing 12, 14, 112, 114) surrounds the three-dimensional conductive structure 30, 130) . The outer housing 12, 14, 112, 114) includes interior surfaces that connect with the dielectric film 36, 136). In a method for generating or amplifying microwave energy, a three-dimensional conductive structure is laser micromachined to define a selected generally periodic pattern thereon. The conductive structure is arranged inside a generally hollow barrel. An electron beam passes through the generally hollow three-dimensional structure and interacts with the conductive structure and the generally hollow barrel to generate or amplify the microwave energy.

Abstract: A method for constructing thermally and dimensionally stable traveling wave tube circuits having high dimensional stability, narrow tolerances, and very small size by providing a small hollow preform constructed of a desired material which is coated with a layer of photoresist material then exposed to a UV laser to form a desired pattern mask in the photoresist layer. The pattern masked preform is then etched to create a preform having a desired shape. After shaping, the photoresist coating is stripped from said shaped preform to form a traveling wave tube circuit. Optionally the travel wave tube circuit may be polished.