Abstract: A method and device for efficient defibrillation, to be utilized in external defibrillation machines, capable of being utilized with 2, 3, or more defibrillation electrodes. The method and device achieve the efficient defibrillation by ensuring that the defibrillation machine energizes the patient with the waveform which is optimum for the number of defibrillation electrodes in use. The method and device accomplishes this by (1) sensing the number of defibrillation electrodes in use, and by (2) selecting the optimum defibrillation waveform for energization of the sensed number of defibrillation electrodes in use.

Abstract: A data processing configuration includes a computer, a printer and a font memory which houses tables that define spacing metrics that are individual to each glyph included in a font. The computer is connected to the font memory and further includes a printer driver function which is controllable to download glyph data to the printer in response to an output from an application, running on the computer, which specifies a requirement that a glyph is to be printed by the printer. The computer is responsive to a download requirement to derive from the font memory, header data for transmission to the printer. The downloaded header data excludes the spacing metrics that are individual to each glyph of the font. Thereafter, the printer driver downloads required font glyph data by transmitting data structures to the printer which include, among other data elements, the spacing metrics that are individual to the specific glyph being transmitted.

Abstract: First and second layers are alternately laminated on the semiconductor substrate, providing a multilayer structure in which the resultant residual stress in the layered structure is significantly decreased. One embodiment of the invention is applied to a vertical cavity surface emitting laser having a dielectric multilayer mirror comprised of pairs of a first layer (SiO.sub.2 layer) and a second layer (TiO.sub.2 layer). Each layer has a prescribed thickness and is formed by deposition on a semiconductor (GaAs) substrate. When the layers are deposited on the semiconductor substrate, the first layer is preferably formed to exhibit a residual compressive stress, while the second layer is preferably formed to exhibit a residual tensile stress having a magnitude that is equal to or almost equal to the residual compressive stress of the first layer.

Abstract: An oven assembly for a crystal resonator and oscillator utilizes a thermally symmetrical design to provide a high thermal gain. The oven assembly includes an encasement that forms a hermetically sealed oven chamber that is substantially cylindrical. Concentric with the oven chamber is an annular oven mass that functions as a heat reservoir for the crystal resonator that is contained within the oven mass. The cylindrical oven chamber and the concentric annular oven mass provide two levels of circular symmetry that help achieve a thermally isotropic oscillator environment. Wide-area uniform heat transfer promotes high thermal gain and minimizes thermal gradients. Another factor is the geometry and circuitry for temperature monitoring. Temperature sensors are equidistantly spaced from each other and are equidistant from the center of the oven chamber. Signals from the various thermistors are averaged to provide a more accurate temperature determination for regulating the heaters.

Abstract: A network connection scheme for a direct or an indirect network. The network is implemented in two levels of circuit boards. Every board in the first level crosses all the boards in the second level, with every processor in the first level circuit board coupled to at least two processors that are on two second level circuit boards. This scheme significantly reduces the difficulty in implementing the network.

Abstract: A line-focus system with a bulb in a bulb enclosure assembly, where the bulb has a lamp label attached to it in such a manner as to create an occluding aperture for directing light from the bulb toward the scan line in the line-focus system. The lamp label is shaped in such a manner that the light intensity across the photosensor line array in the line-focus system is relatively uniform. The lamp label is furthermore of an opaque, non-reflecting nature so as to prevent any stray light from being reflected into the line-focus system.

Abstract: An improved tri-state output buffer having an emitter-follower output stage clamps the reverse-bias voltage across the base-emitter path of an emitter-follower to limit the output leakage current and thereby extending the operating life of an integrated circuit (IC). A current sensitive voltage device such as a bipolar transistor or diode clamps the reverse-bias voltage of the base-emitter path. Voltage clamping prevents the bipolar transistors from activating while the buffer is disabled. The output leakage current that occurs when the junction is forward biased is minimized. This results in low output load capacitance that improves the propagation delay particularly when multiple buffers are used.

Abstract: A defibrillator applies a defibrillation waveform to a patient. Waveform selection circuitry in the defibrillator uses a reference waveform to give the defibrillation waveform a desired shape. Preferably, a user selects between a plurality of stored waveforms, and the reference waveform is generated from the stored waveform selected by the user. As an alternative to selecting a stored waveform, the user may also create a new waveform, which is then stored for a future selection.

Abstract: A monitor probe for a communications signalling network, such as an SS7 network, is arranged to determine its own location on the signalling network by watching for a particular type of message which carries the required information in its routing label. The routing label of a message is the part of the message indicating the source and destination points for the message as well as providing link-related information for cases where more than one link connects two signalling points. Whilst the routing label of most messages on an SS7 network does not give a reliable indication of the absolute identity of the link on which the message was monitored, in the case of signalling link test messages, the routing label contains the identity of the two points at the end of the link on which the message was monitored as well as the identity of the link as between that link and any other parallel link; these items of information form an absolute identifier for the link which the message was monitored.

Abstract: A method of operating a thermal inkjet printer having a thermal inkjet printhead that includes the steps of selecting an ink drop volume, selecting a pulse width that will cause the thermal inkjet printhead to deposit an ink drop having the selected drop volume, and operating the thermal inkjet printhead with the selected pulse width and at an operating energy that is greater than a turn-on energy of the printhead for the selected pulse width.

Abstract: A single-phase clocking scheme for use in a VLSI chip having a plurality of localized logic blocks implemented thereon is presented. The present invention includes a first level global clock buffer for receiving an external global clock and producing a first level global clock. A plurality of second level clock buffers, one corresponding to each localized logic block, receive the first level global clock via protected equal length lines, and each produce a respective second level global clock. Each of the localized logic blocks include a plurality of third level clock buffers, wherein each third level clock buffer receives the second level global clock of its respective localized logic block, and each produces a third level local clock. The third level local clock buffers within each localized logic block generate different clocking schemes from each of the other third level local clock buffers contained within the same localized block.

Abstract: An optical disk cartridge assembly comprising: an optical disk for storing data thereon in machine readable form; a casing for rotatably supporting the optical disk therewithin and for shielding the optical disk from physical contact with other objects; and a door slideably mounted on the casing for selectively covering and uncovering an opening therein; the casing having a wear factor associated with sliding contact with the door of less than 100.times.10.sup.-10 in..sup.3 -min./ft.-lb.-hr. and most preferably less than 10.times.10.sup.-10 in..sup.3 -min./ft.-lb.-hr. An information storage system employing a low-wear optical disk cartridge assembly and a method of making a low-wear optical disk cartridge assembly are also disclosed.

Abstract: Network access to a port is secured by monitoring the source address of packets that are sent as a device tries to train to the port over the network. If the source address matches an authorized source address assigned to the port to which the device is attached, then the device is allowed access to the system. If the device tries to train with a source address different from the authorized address, then the device is not allowed to train into the network, and all packets sent by the device are denoted as errored packets to prevent them from being accepted by any other device in the network. The system also detects when a device tries to disguise itself by first training with an authorized source address and then sends a packet with an unauthorized source address. If a packet is received which contains a source address other than the one that the device is authorized to use, the packet is marked as invalid so that it is not accepted by any other device in the network.

Abstract: The tonal resolution of an image scanner is improved by adjusting the dynamic range of an analog-to-digital converter of the scanner. A preview scan of the image is made. The image data from the preview scan is then analyzed to determine a maximum intensity and a minimum intensity. The value of the maximum intensity is used to set a white intercept of the image scanner such that a maximum digital value of the analog-to-digital converter corresponds to the maximum intensity present in the image data from the preview scan. The minimum intensity is used to set a black intercept of the image scanner such that the minimum intensity in the image data from the preview scan corresponds to the minimum digital number output by the analog-to-digital converter. Tonal resolution of the image scanner is optimized then by performing a final scan of the image with the analog-to-digital converter programmed to reflect the new white intercept and black intercept values.

Abstract: A vertical-cavity surface-emitting laser that generates light having a fixed direction of polarization. The laser has a plane light-generating region sandwiched between a first conductive mirror region and a second conductive mirror region. The first conductive mirror region has an opposite conductivity mode from the second conductive mirror region. The first conductive mirror region has a remote surface substantially parallel to the light-generating region and an electrode formed on the remote surface. The electrode bounds a light emission port from which the light is emitted in a direction defining an axis. A reduced-conductivity region is formed in the first conductive mirror region surrounding the axis and extending from the remote surface towards the light-emitting region to define a core region in the first conductive mirror region. The light emission port and/or the core region has first and second dimensions in orthogonal directions in a plane parallel to the light-generating region.

Abstract: The invention relates to an ionization chamber. More particularly, the invention relates to a mass spectrometer system having an ionization chamber incorporating a corona needle removable from outside the closed ionization chamber. In preferred embodiments, the corona needle is self-positioning and engages and disengages operational or safety electrical connections.

Abstract: A method for fabricating transparent substrate vertical cavity surface emitting lasers ("VCSEL"s) using wafer bonding is described. The VCSELs have their active layers located much more closely to a heat sink than is possible in known absorbing substrate VCSELs. The improved heat transport from the active layer to the heat sink permits higher current operation with increased light output as a result of the lower thermal impedance of the system. Alternatively, the same light output can be obtained from the wafer bonded VCSEL at lower drive currents. Additional embodiments use wafer bonding to improve current crowding, current and/or optical confinement in a VCSEL and to integrate additional optoelectronic devices with the VCSEL.