Abstract: A discharge lamp illumination circuit 1 has a DC-AC conversion circuit 3 which effects DC-AC conversion and boosting upon receipt of a DC input, and a starter circuit 4. The DC-AC conversion circuit 3 has an AC transformer 7, a plurality of switching elements 5H and 5L, and a resonance capacitor 8. The switching elements are activated by control means 6, thereby inducing series resonance between the resonance capacitor 8 and an inductance component of the AC transformer 7, or between the resonance capacitor 8 and an inductance element connected to the resonance capacitor 8. In connection with the operating frequency of the switching elements, a first frequency value is a frequency value of a period when outputs are open before the discharge lamp 10 is illuminated, and a second frequency value is a frequency value of a period from illumination of the discharge lamp by the starter circuit until elapse of a predetermined time period or a time period which is specified in accordance with an illumination state.

Abstract: An optoelectronic transceiver is provided that includes a laser driver in communication with an optical transmitter. The laser driver includes an operational amplifier having three stages and connected with an optical transmitter. The first stage includes a differential amplifier that receives a reference voltage input, corresponding to a desired magnitude of the optical transmitter voltage, and an optical transmitter voltage input, representing an optical output strength of the optical transmitter, and having transconductance that increases exponentially as a difference between the reference voltage and the optical transmitter voltage increases. The differential amplifier generates an output current based on the inputs. The second stage integrates the output current to generate a first output voltage.

Abstract: An antenna on a printed circuit board (PCB) with a compensating capacitor. The antenna has a radiator disposed over a first surface of the PCB. Wherein the radiator includes a signal feeding section and a tuning section coupled together at a joint. The tuning section includes a bending portion. Also and, a ground layer with or without a protuding portion is disposed on a second surface of the PCB, wherein the bending portion of the tuning section is overlapping with the ground layer to form the compensating capacitor. In addition, the radiator can also have a short circuit stub section, electrically coupled to the ground layer.

Abstract: A discharge lamp illumination circuit 1 has a DC-AC conversion circuit 3, which effects DC-AC conversion and boosting upon receipt of a DC input, and a starter circuit 4. Power output from the DC-AC conversion circuit 3 is controlled by means of control means 6. The DC-AC conversion circuit 3 has an AC conversion transformer 7; a plurality of switching elements 5H and 5L; and a resonance capacitor 8. The switching elements are activated by the control means 6, thereby causing serial resonance between the resonance capacitor 8 and a leakage inductance component of the AC conversion transformer 7, or between the resonance capacitor 8 and an inductance component 9 connected to the resonance capacitor 8.

Abstract: A green diode laser includes a tubular laser casing, a heat sink sealedly mounted at the laser casing, a semiconductor chip supported by the heat sink, an optical resonant cavity supported within the laser casing, including a lasing medium and an intracavity frequency doubler, an IR blocking filter inclinedly and seadedly mounted at the laser casing to optically communicate with an output facet, and a photodiode supported within the laser casing at a position that when the laser beam exits the output facet, the IR blocking filter reflects a portion of the laser beam towards the photodiode such that the photodiode is adapted for detecting the laser beam from the IR blocking filter as a feedback for controlling a power output of the green laser chip.

Abstract: A method of independently modifying the ¼ and/or the ¾ wavelength resonant frequency in an open-ended slotted PIFA antenna, an open-ended slotted PIFA antenna comprising an antenna feed and an antenna ground wherein the antenna ground is associated with the antenna short-circuit end, and an open-ended slot having an open-end associated with the antenna open-circuit end, and wherein the antenna ground and the slot are mutually arranged to provide operational variations in the current density between the open and short circuit ends of the antenna and around the perimeter of the slot, and an operational mean current path length between the open and short circuit ends of the antenna and around the perimeter of the open-ended slot, the mean current path length determining the ¼ and ¾ wavelength resonant frequencies for the open-ended slotted PIFA antenna, the method comprising determining operational variations in current density around the perimeter of a pre-modified open-ended slotted PIFA antenna and modify

Abstract: A method of electrically isolating and operating electro-optical components integrated in a monolithic semiconductor photonic chip, such as an EML or PIC chip. A bias, VC, is applied to the isolation region so that any parasitical current path developed between adjacent active or passive optical components, now separated by an isolation region, is established through the electrical isolation region and clamped to the bias, VC. The applied bias, VC, may be a positive bias, a negative bias, or a zero or a ground bias. The electrical isolation regions are formed by spatial current blocking regions formed at adjacent sides of the electrical isolations region transverse to a direction of light propagation through the optical components, or between the electrical isolation regions and adjacent optical components. The spatial current blocking regions may be comprised of a pair of spatially disposed trenches or ion implanted regions or high resistance implanted regions.

Abstract: A digitally-controlled vertical S linearity correction with a constant amplitude without using an AGC. To preserve line spacing between horizontal lines toward a top and bottom of a screen a third order correction voltage Vcube is applied to a sweep voltage Vosc. A constant current decoder determines an amount of appropriate correction current, which is employed to generate a sweep voltage with modified amplitude due to S correction and one without the modified amplitude. The sweep voltage with constant amplitude is employed to generate Vcube. Vcube is then applied to the sweep voltage along with a compensated amplitude component of the sweep voltage, such that a reduction in the amplitude caused by the S correction is compensated in the output voltage Vout. The compensation of the output voltage amplitude prevents a size reduction of the displayed picture on the screen without employing an iterative auto-align process.

Abstract: A reflector antenna system may include an arc-shaped antenna reflector defining a first antenna beam, and a phased array antenna positioned in the first antenna beam including first and second arrays of antenna elements coupled together in back-to-back relation. The first array may face the antenna reflector, and the second array may face away from it. A controller switchable between a reflecting mode and a direct mode may be connected to the arrays. The controller, when in the reflecting mode, may cause back-to-back pairs of first antenna elements from the arrays to define a feed-through zone for the first antenna beam, and cause second antenna elements in the first array to define a first active zone for the first antenna beam. Furthermore, when in the direct mode, the controller may cause antenna elements in the second array to define a second active zone for a second antenna beam.

Abstract: A method and circuit for digitally controlled vertical C linearity correction with constant start and end points without using an AGC. A squared voltage and a negative squared voltage are added as a correction voltage to a sawtooth-shaped ramping voltage that is employed to sweep an electron beam across a display. Line spacing toward the edges of a screen are maintained equal as a result enabling a uniform presentation of a picture on a non-spherical display. A digitally controlled attenuator determines a correction coefficient for correction voltages. The correction voltage is also processed by a sample-and-hold circuit to obtain a peak squared voltage. The peak squared voltage is then compared to a DC reference voltage and an offset adjustment current determined, based on a result of the comparison. The correction voltage is then added to the ramping voltage, which is also shifted by the offset amount.

Abstract: A semiconductor laser device has a laser chip, a stem having a block portion on which the laser chip is mounted, and a cap mounted on the stem so as to cover the block portion. The cap has a cutout portion into which the block portion is partially inserted. With this arrangement, the block portion is enlarged, so that the block portion is easily formed integrally with the stem to reduce the manufacturing cost of the stem, and that heat release is increased to improve operating lifetime and the temperature characteristic of the laser element.

Abstract: The dual-band antenna of the present invention includes a substrate having a first edge, an emitting unit, a transmission line, and a ground pad. The emitting unit disposed on the first surface of the substrate has a first wire and a second wire, which are crossed at a feeding point. The transmission line coupled to the feeding point is used to transmit the RF signals. The ground pad disposed on the second surface of the substrate has a base and an extension. The base is extended from the substrate toward feeding point. The extension is adjacent to the emitting unit and is extended from the base toward the first edge. The combination of the base and the extension forms an “L” shape.

Abstract: Integrated microwave transceiver tile structure including (a) a first, generally planar, circuit-board layer structure possessing an array of plural, integrally formed microwave transceivers arranged in a defined row-and-column pattern, with each transceiver having an associated transceiver axis extending generally normal to the plane of said the first layer structure, and (b) a second, generally planar, circuit-board layer structure including transceiver-function operational circuitry operatively connected to the transceivers, and functional to promote operation of the transceivers simultaneously in transmission and reception modes of operation.

Abstract: The present invention is directed, in part, to a carbon dioxide laser resonator gas comprising carbon dioxide, helium, and nitrogen and having a total halocarbon concentration less than about 100 parts per trillion. In one embodiment, the total halocarbon concentration is less than about 50 parts per trillion. The laser resonator gases, laser systems, and methods of the present invention provide high efficiency and high power laser light while reducing the cost of maintenance and improving the performance of a laser system by limiting the total concentration of halocarbon.

Abstract: It is an object of the invention to provide a holographic laser and an optical pickup, with which it is possible to read from and write to a plurality of types of optical disks with different read wavelengths, and to achieve a more compact apparatus. The holographic laser includes for example a package, two semiconductor laser elements and a photodiode for reading out signals accommodated within the package, a holographic element positioned proximate to or in close contact with the top of a glass window, and a wavelength separating element positioned proximate to or in close contact with the top of the holographic element. The holographic laser is integrally formed as a single component.

Abstract: A balun that includes a first conductor, a second conductor and a third conductor. The first conductor has a length of about one quarter wavelength of a selected center frequency. The first conductor also has a first end connected to a first balanced power amplifier output port. The second conductor has a length of about one quarter wavelength of the selected center frequency. The second conductor also includes a first end connected to a second balanced power amplifier output port and a second end connected a second end of the first conductor. The third conductor has a length of about one quarter wavelength of the selected center frequency. The third conductor has a first end connected to an antenna port and a second end connected to a ground potential.

Abstract: A communications terminal is provided which includes an antenna element, which has a specific antenna volume, and an acoustic output device, wherein the antenna element and the acoustic output device are designed and/or arranged with respect to each other such that at least part of the antenna volume forms at least part of a resonant cavity for the acoustic output device.

Abstract: The invention relates to an image projector with a High-Intensity-Discharge HID lamp (112) and a method of operating it. Such lamps have the disadvantage that their voltaic arc jumps back and forth between different positions at unforeseeable times during operation. This so-called arc jumping has the effect of changing the brightness, i.e. the overall brightness and/or the brightness distribution of the light emitted by the HID lamp (112). For the viewer of an image projected with such a projector, this effect appears as a jolt of this projected image. To avoid such effects for the viewer, it is first proposed according to the invention that changes in the brightness of the light in the image projector's beam path are detected. As soon as a change in brightness caused by an arc jump has been detected, this brightness is reset to a brightness detected at a moment t-2 before the arc jump, in order subsequently to convert it during a predetermined time interval T to the brightness resulting from the arc jump.

Abstract: A door handle assembly for a vehicle includes a handle portion and an antenna positioned within the handle portion. The handle portion is movable or actuatable to open the door of the vehicle. The antenna receives a signal from a remote signaling device and communicates a signal to an accessory or system of the vehicle, such as a door locking/unlocking system of the vehicle, a lighting system of the vehicle, an ignition system of the vehicle, and/or the like. The antenna may function to receive the signal and automatically communicate a signal to the accessory or system of the vehicle in response to a remote signaling device approaching the door handle assembly. The antenna is preferably positioned within a cavity of the door handle portion and, more preferably, the handle portion is molded at least substantially around the antenna.

Abstract: A phased array antenna includes a substrate, and a patterned conductive layer is on the substrate. The patterned conductive layer defines a plurality of slotted dipole antenna elements each having a medial feed portion associated therewith. Each slotted dipole antenna element includes a pair of slotted legs extending outwardly from the medial feed portion. Pairs of adjacent slotted legs of adjacent slotted dipole antenna elements include respective spaced apart end portions having predetermined shapes and relative positioning to provide increased inductive coupling between the adjacent slotted dipole antenna elements.