摘要:
A waveguide having reduced windloading yet a relatively wide bandwidth for the dominant mode of propagation comprises an elongated cylinder having substantially parallel plates forming an interior waveguide portion which in cross-section is a doubly-truncated circle. The plates are symmetrically disposed about the central axis of the elongated cylinder.
摘要:
A magazine and driving means particularly adaptable for handling semiconductor lead frames, or the like, in an automatic processing device such as a bonder is described. The magazines slidingly engage buttons on the front panel of the bonder or other device. In-line teeth defining a rack are formed on the exterior of each of the magazines. The magazines are driven directly by indexing pins which are connected to a geneva movement. Missing teeth at the ends of the racks allow the magazines to feed-through, thus providing automatic, uninterrupted operation from magazine-to-magazine.
摘要:
An electric heating furnace which includes a conductive electric resistance heating element strip mounted within a chamber defined by walls of porous refractory insulating material. Terminal or mounting pins extend through the wall of insulating material and the heating strip are secured thereby. A sleeve of non-porous refractory material surrounds the portion of the pin within the wall of insulating material for electrically insulating the pin from the porous refractory wall material which may have a conductive layer of carbon build up therein under certain heat treating conditions.
摘要:
A material heat treating system having a plurality of integral quench furnaces and means to convey material to be treated thereto in a selected pattern operated by controllers into which selected patterns of treatment are fed. The controllers feed signals to a selected furnace to control operation thereof in a selected manner and also provide signals to control movement to, from and through the system in accordance with a selected program.
摘要:
A stress-relieving material for the surface of an insulated electrical conductor consists essentially of a cold-flowable, low viscosity, corona-resistant elastomer containing from about 350 to about 600 parts by weight per hundred of elastomer of a semiconductor material and up to about 10 parts per hundred of elastomer of processing aids.
摘要:
A height sensor is disclosed which permits a tool to sense the height of a semiconductor die, or the like, above a work surface such as a bonding table. A tool arm moves transverse to the work surface and is interconnected to a cam by a second arm. The second arm is disengageable from the first arm and disengages the first arm when the tool contacts the semiconductor die. Sensing means are provided to detect the separation of the two arms.
摘要:
A circuit is provided for providing a regulated d.c. output of a substantially high output current magnitude from an unregulated single or polyphase a.c. input source. Regulation is provided by a single feedback circuit interacting with a plurality of ferroresonant transformers connected in parallel to a single phase source, singly on each phase or a polyphase source, or interconnected in the known Scott T connection on a three phase source. Regulation is accomplished with thyristor switches which are synchronized with the input phase of each transformer.
摘要:
An electrical receptacle having a body with upper and lower molded plastic portions with a grounding strip located in a cavity therebetween, the lower portion having extending mounting strap ears and the grounding strip having a connection extending under one of said ears for making contact with a holding screw, said grounding strip also having a visible connection tab.
摘要:
A strap for mounting an electrical wiring device in a mounting box comprises a yoke member having laterally projecting tabs on each end thereof, the tabs being fastened to the mounting box. A pad of electrically insulating material is positioned upon the tab so as to be interposed between the tab and the mounting box when the strap is mounted. The tab and pad are each provided with a slot through which a mounting screw passes, and the portion of the pad defining the slot has a beveled aperture with resilient lips so as to engage the threads of the mounting screw received in the slot to prevent movement of the mounting screw with respect to the strap and to insulate the strap from the mounting box.
摘要:
A constant voltage, constant frequency, uninterruptible a.c. power supply having a line voltage regulator, a rectifier-inverter with an emergency battery power supply and a transfer switch for selectively connecting the line voltage regulator and rectifier-inverter to a load. Under normal conditions, the line voltage regulator and rectifier inverter derive their operating power from the power line and are both connected to the load. If the fault detection system detects a power line fault, it causes the transfer switch to disconnect the line voltage regulator from the load and the rectifier-inverter supplies power to the load from the emergency battery power supply. If the fault detection system detects a rectifier-inverter fault, it causes the transfer switch to disconnect the rectifier-inverter from the load. A synchronization control system regulates the phase of the rectifier-inverter.