122 results about "Arc lamp" patented technology

An improved optical system for treatment of disorders of the skin, especially vascular lesions, such as Port Wine Stains. The system irradiates the skin with radiation at a predetermined wavelength and cools the skin during a predetermined time interval in coordination with delivery of the radiation. The absorption of the radiation by the skin and the change in temperature of the skin is monitored by the system and the operation of the radiation delivery system is controlled to optimize treatment of the vascular lesion. The source of irradiation is an arc lamp and the cooling system delivers a cooling gas to a lens in contact with the skin. The cooling gas can be carbon dioxide, freon, or any other appropriate gas. The lens used has a high heat conductivity and may be formed of sapphire.

This invention relates to the zonal transmission of data by the modulation of the light output of arc lamps or discharge lamps; including the visible or invisible light output of fluorescent lamps, mercury vapor lamps, high or low-pressure sodium lamps, metal-halide based lamps, or other arc or discharge lamps. The method results in an easily installed, easily maintained, and economical to purchase, optical-wave communications system which exploits the existing infrastructure of a building or facility to facilitate the transmission of data in individual zones; thereby facilitating the transmission of wide-area as well as zonal-specific data to compatible receivers, and further facilitating the determination of location of remote devices or users, and the delivery or exchange of information or data, utilizing limited range transmission techniques.

The present invention generally relates to video and / or television projection systems, and more particularly, to LED based light source systems utilizing generally non-rotationally symmetric, preferably oblong or rectangular, non-imaging collection optics for providing improved projection systems relative to arc lamp and other LED based light source systems. The non-rotationally symmetric non-imaging collection optics are configured to operate with LEDs to provide preferred, generally, uniform light distributions whose étendues match those of downstream applications such as those encountered in projection systems. Also provided are various arrangements for coupling LED output to the entrance aperture of collection optics and for coupling the outputs from a plurality of collection optic outputs to form single beams of illumination of preferred patterns, intensities, and color.

A xenon arc searchlight incorporates a high frequency / high efficiency electronic circuit that allows lamp ballasting and charging of the system battery to occur over a wide range of external DC power supplies. The xenon arc searchlight has a converter circuit coupled to both the battery, the ballasting circuit and the arc lamp for converting DC voltage from the battery to pulse width modulated switched current to the arc lamp in which the DC voltage is switched by parallel switching transistors. The ballisting circuit is controllable by a switch to vary current supplied to the converter circuit and hence intensity of the lamp which discrete steps in intensity of the lamp are not visually perceptibly different between one step to a next step in the sequence of steps of the current to the lamp. The lamp, ballast, battery and charger are provided in a single rugged package.

High pressure mercury arc lamps are commonly used as the illumination source in many projection systems. Such lamps may be deficient in either output power or spectrum, and so it is desirable to combine the light from the lamp with light from a second light generator. The second light generator may be another mercury lamp or a solid state source, such as one or more light emitting diodes. Different ways of combining light from two light generators are described. The second light source may be an arrangement of a number of red LEDs that supplements the red light produced by the mercury light. A tunnel integrator may be used to homogenize the combined light beam and to reduce the angular separation between the light beams from the two light generators.

An apparatus for producing a high intensity beam of light with high efficiency of conversion of electrical power into light intensity includes an arc lamp, a reflector, a screw drive mechanism coupled between the arc lamp and reflector for positioning the arc lamp relative to the reflector to provide zoom control of the beam of light, and a spring for biasing the screw drive mechanism into a stable configuration to eliminate backlash and instability of the positioning the arc lamp relative to the reflector to provide zoom control of the beam of light. A handheld light includes an IR filter selectively disposable over the aperture of the light so that only infrared light and a circumferential light curtain is interposed between the IR filter and the body so that no there are no light leaks even the IR filter and the body are prevented from fitting closely due to interposed debris.

This invention provides a system and method that enables the use of incoherent light sources, such as light emitting diodes, to provide for the detection of gaseous species which exhibit broadband absorption features (e.g., nitrogen dioxide and the halogen gases). The light emitting diode (LED) is an ideal light source for such an arrangement in that it can be modulated at high frequencies (allowing for omission of external modulation equipment) and provides sufficient illumination within a reasonably narrow wavelength band as compared to, for instance, an incandescent light source. A further advantage of a LED as a light source compared to alternatives such as a gas discharge or arc lamp is that the light output of the LED is highly stable, limited by the stability of the current source used to drive it. Use of a confocal or near-confocal resonant optical cavity maximizes coupling of the light source to the cavity.

An air vent apparatus for blocking light is provided for devices requiring a light source for generating light, such as a presentation projector, an arc lamp, a laser device and the like. The improved air vent apparatus employs a stacked chevron design to minimize the restriction of the flow of air through the air vent while blocking the escape of direct light. In one embodiment of the present invention, the stacked chevron is symmetrically disposed in the air vent housing of the device. In another embodiment of the present invention, the stacked chevron is asymmetrically disposed in the air vent housing so that a vane of the chevron extending towards the interior of the air vent is substantially perpendicular to the air vent housing and substantially parallel to the source of the flow of air. The use of a stacked chevron design allows the air vent in the device housing be constructed with vanes having a range of shallower angles than those of prior art vents so as to minimize the restriction of the flow of air through the vent, while at the same time blocking all or nearly all of the direct light emitted from the device's light source. Numerous variations in the length of the vanes of the chevron (i.e. the depth of the air vent), the vane angle, and the pitch (i.e. the distance between the stacked chevrons) may be employed to achieve a suitably optimal vent for a number of different devices, including presentation projectors, arc lamps, laser devices and the like.

A projection system is provided with improved contrast and reduced artifacts using a larger lamp to maintain good lamp life. The projection system uses two imagers, the first being larger to accommodate a large lamp, sized to the first imager and the second being smaller. The first imager has a matrix of pixels for modulating light on a pixel-by-pixel basis to form a first modulated matrix of light. The second imager has a matrix of pixels corresponding to the pixels of the first imager for modulating the first modulated matrix of light on a pixel-by-pixel basis to form a second modulated matrix of light. The second imager having a size smaller than the size of the first imager. A relay lens set provides a magnification of less than 1.0 to relay each pixel of light in the first modulated matrix of light onto a corresponding pixel of the second imager.

A high intensity discharge (HID) light fixture includes a reflector frame which supports an independent high reflectivity reflecting surface. The reflector frame supports a glass lens with anti-reflective coatings on its surfaces and a visor or extension that also supports an independent high reflectivity reflecting surface. The high reflectivity reflecting surface has various sections that adjust portions of the beam created by the fixture to better place light on a target area. The reflector frame is attachable to a lamp cone. An adjustable knuckle attaches between to a cross arm on a pole and the lamp cone. An HID lamp, when mounted in the lamp cone, has its arc tube substantially surrounded by the high reflectivity reflecting surfaces of the reflector frame and visor. A lamp positioning mechanism automatically adjusts orientation of the arc lamp over a range of pivot angles for the lamp cone relative the knuckle. The HID lamp has an increased metal halide salt pool and does not include white oxide coatings at opposite ends. The lamp and the lamp positioning mechanism are configured to position the arc tube of the lamp horizontal over the normal range of aiming angles for the fixture. The modified HID lamp, its operating position, the high reflectivity reflecting surfaces, and other aspects of the fixture produce more light from the fixture than without these features for the same amount of energy to operate. Optionally, a ballast circuit can save energy over operating life of the lamp.

A flashlight has a body containing control circuitry, with a lamp connected to the body and to the control circuitry. A photodetector is connected to the body and the control circuitry, and faces the lamp to sense an operating condition of the lamp. The control circuitry operates the lamp in a start up mode until signaled by the photodetector that the lamp is properly operating. After this, the lamp is operated in a normal mode. The flashlight may have a switch with a button that moves through a range of positions. The switch may have several contact elements, and the button may have an actuator registered with each of the contact elements. The actuators may be of different heights, to provide a sequence of switch operation. Some of the actuators may be movable to allow the button to be actuated further after an initial contact is made.

An aesthetic treatment device and method for treating the skin of a patient, the device comprising at least one of a plurality of arc lamps, each arc lamp provided with a reflector for obtaining a substantially collimated beam; a pulse generator for generating a train of pulses of electrical energy for energizing said at least one of a plurality of arc lamps; a control unit for controlling pulse shape, amplitude, width, frequency and timing, for obtaining controllable spectral output and energy of the collimated beam through an application end of the device to a designated area of skin of the patient. The device can further comprise secondary light sources with different spectrum characteristics than the arc lamp as well as various attachments including a position feedback, material dispenser, skin cooler, and docking station for optical fiber.

A light delivery technique includes optical configurations as well as the associated methods that generate a ring beam from a linear light source. In one embodiment, a remote light source module delivers illumination light to a fundus camera and / or slit lamp. In another embodiment, an arrangement combines the use of a light pipe homogenizer and a ring beam transformer for efficiently collecting light from a substantially axially linear light source, homogenizing the collected light that lacks low angle flux relative to the optical axis, and transforming the light into a ring beam with a substantially improved low angle flux distribution. In still another embodiment, light emitted from a substantially axially linear light source is directly collected by a curved surface mirror and spatially filtered into a ring beam. The ring illumination beam can be co-axially projected on a sample such as the pupil of a human eye and at the same time the light beam also has a large enough relatively uniform angular flux distribution so that a wide area on the retina of the eye can be uniformly illuminated.

The specification describes methods for releasing adhered components to adhesive-backed carrier tapes. It is based on the recognition that with proper choice of the adhesive, i.e. a thermal release adhesive, selectively applied heat will modify the adhesive, eliminating or substantially reducing the adhesion between the tape and the IC chip. This allows components to be picked from the adhesive-backed carrier tape without mechanical assistance. Thermal release adhesives having fast rise times are preferred, allowing for pick and place cycles of less than one second, e.g., less than 0.5 seconds. Preferred means for applying selective heat to the adhesive on the carrier tape are ceramic heaters. Other choices are arc lamps, tungsten halogen lamps, xenon lamps, lasers, and infra-red lamps.

Optical systems comprising apparatus and methods for redirecting and concentrating illumination from a source of illumination such as an arc lamp or optical fiber into a narrow line while conserving much of the useful energy of the light source. Light from the point source is optically directed into a collimated beam which is then optically focused in one axis into a substantially line shaped beam of illumination at the point of focus. At the point of focus an optical element exchanges the converging and collimated angles of the beam over a period approximately less than or equal to the width of the focused beam. The beam of light which is now collimated in the short axis of the focused beam and diverging in the long axis of the focused beam can be further focused or directed into a narrow line of light which can be used for projection, illumination scanning or by systems for wavelength conditioning wavelength.

A short arc lamp driving circuit includes a trigger boosting circuit, a flash current control circuit, and a closed loop exposure control and calibration circuits that, when combined, can produce short pulses of light with short time separation, quasi-continuous illumination light, and meanwhile, an extremely large dynamic range of delivered and / or calibrated light power or energy.

A high pressure arc discharge lamp apparatus comprises a lamp and operating means therefor, the lamp comprising an envelope containing a dose of mercury and a pair of electrodes with their tips (32, 34) spaced apart from one another to define an arc gap. At least one of the electrode tips is formed with a hollow (44, 46) in its surface (40, 42) facing the other electrode, and the operating means includes means for driving the lamp at an A.C. frequency of at least 200 Hz.

A surgical lighting system including overhead surgical lights having integrating cavities which capture metal halide arc lamp optical energy and output spatially uniform optical energy to reflectors which direct the optic energy to a common surgical illumination region, a surgical light port system having illuminating ports, and a thermal dissipater. The surgical lighting system includes power back-up systems and light sources with multiple lamps that are automatically sequenced to provide constant surgical illumination.

The present invention describes several embodiments of optical systems for the projection of images formed on reflective liquid crystal light valves. These light valves are capable of high resolution and very small sizes. The optical systems described are able to project these images with highly efficient utilization of light from an arc lamp source and are also very compact and easy to manufacture.

A xenon arc lamp for a motion picture projector is cooled by providing the anode end of the lamp with a shroud that forms part of a support for that end of the lamp. Cooling air flows into the shroud along the support arm and enters the shroud through a slot in its side wall. The shroud provides an annular air space around the anode end of the lamp and has an annular air outlet through which the cooling air leaves as a "sheet" of laminar air flow which tends to adhere to the surface of the bulb, thereby providing precise cooling. In this way, arc instability is avoided or minimized, while lamp life is extended.

The invention discloses resin asphalt ultraviolet aging testing equipment and a testing method thereof and relates to resin asphalt aging testing equipment and a method which aim at solving the problem that an aging test can not be carried out on resin asphalt by adopting an xenon arc lamp or an open type carbon arc lamp. According to the resin asphalt ultraviolet aging testing equipment, a lamp bracket is arranged in an ultraviolet aging incubator, and four ultraviolet lamp tubes are horizontally fixed at the top of the lamp bracket and arranged in parallel through electric wires. The testing method comprises the steps of: 1, preparation of a test piece, namely a. preparation of a resin asphalt test piece; b. preparation of a resin asphalt concrete Marshall test piece; c. preparation of a resin asphalt concrete small beam test piece; 2, putting all aging groups into the ultraviolet aging incubator; putting room temperature groups into a room; 3, after 21 days, taking out all the aging groups; 4, a. carrying out infrared spectrum analysis on the resin asphalt test piece; b. testing the stability of the resin asphalt concrete Marshall test piece; c. carrying out a bending test on the resin asphalt concrete small beam test piece. The resin asphalt ultraviolet aging testing equipment and the testing method thereof are used for the resin asphalt aging tests.

An optical system suited to high sensitivity measurement of small particles as they travel through a point of detection in a flow cell. The system consists of components along two optical axes, preferably but not necessarily, at approximately the Brewster angle to one another. The first axis incorporates a flow cell, high numerical aperture light collection lens, spatial filtering and optical detectors. The second axis incorporates a radiation source (typically a laser or arc-lamp) and beam shaping optics. The two axes are positioned at an angle sufficient to enable collection of small angle light scatter near the edge of the collection lens and to allow collection of medium and large angle light scatter through the centre and opposite side of the collection lens. The invention enables spatial filtering in the image plane of the collection lens to exclude radiation from the dominating sources of unwanted scattering in the flow cell, and also allows the use of a high numerical aperture lens to collect radiation scattered and fluoresced by the sample particles.

A short arc lamp with two transparent apertures. The lamp includes a sealed transparent arc chamber with an internal integral light reflector, and an external light reflecting element positioned external to the sealed arc transparent chamber.

An arc lamp with a housing including a base, an inert gas in the housing, a pair of spaced electrodes in the housing for establishing an arc in the gas to generate a radiation output, a window area on the housing for transmitting forward radiation generated by the arc, and an absorbing medium on the opposite side of the electrodes from the window for preventing backscatter radiation from the arc from passing through the arc and out of the window.

A hand-held flashlight comprising a metal halide arc lamp operating between 8 and 22 watts. The lamp has an arc gap of between 0.7 and 1.4 mm and a color temperature at or above 5000° Kelvin. The lamp contains a fill gas including mercury and indium in percentages to produce a point source of white light capable of penetrating dense smoke and fog. The flashlight includes a reflector containing the arc lamp and providing a collimated beam of high intensity white light. The flashlight includes a circuit for providing a high starting voltage to the lamp and a lower operating voltage after sustaining the lamp. The circuit includes a battery, a ballast, and a microprocessor for monitoring the lamp and the battery. The microprocessor provides a discernible output signal indicative of the lamp on-time and battery voltage. The microprocessor controls the application of the starting voltage from the ballast to the lamp to prevent misstarting of the lamp.

A high intensity discharge (HID) light fixture includes a reflector frame which supports an independent high reflectivity reflecting surface. The reflector frame supports a glass lens with anti-reflective coatings on its surfaces and a visor or extension that also supports an independent high reflectivity reflecting surface. The high reflectivity reflecting surface has various sections that adjust portions of the beam created by the fixture to better place light on a target area. The reflector frame is attachable to a lamp cone. An adjustable knuckle attaches between to a cross arm on a pole and the lamp cone. An HID lamp, when mounted in the lamp cone, has its arc tube substantially surrounded by the high reflectivity reflecting surfaces of the reflector frame and visor. A lamp positioning mechanism automatically adjusts orientation of the arc lamp over a range of pivot angles for the lamp cone relative the knuckle. The HID lamp has an increased metal halide salt pool and does not include white oxide coatings at opposite ends. The lamp and the lamp positioning mechanism are configured to position the arc tube of the lamp horizontal over the normal range of aiming angles for the fixture. The modified HID lamp, its operating position, the high reflectivity reflecting surfaces, and other aspects of the fixture produce more light from the fixture than without these features for the same amount of energy to operate. Optionally, a ballast circuit can save energy over operating life of the lamp.

The invention relates to highly converged high-power adjustable solar simulation equipment. A high-power high-pressure xenon short-arc lamp is used for simulating sunlight; six lamps are uniformly distributed on the periphery of a plane perpendicular to the axis of a middle lamp; and the optical axis of each of the six lamps and the optical axis of the middle lamp form an angle of 15 degrees; each lamp is provided with an ellipsoidal reflective collecting lens; the bright spot of the xenon lamp is adjusted to be positioned at a first focal point of the collecting lens; and light rays emitted by the seven lamps are reflected by the collecting lens and are all converged to a second focal point. The power of the xenon lamp is high, and the optical symmetry of the xenon lamp is also high; and different irradiances under different irradiation areas can be realized by adjusting the number of the lamps which are turned on, the working current of the lamps and the distances from the lamps to a working surface. The highly converged high-power adjustable solar simulation equipment can well simulate various converged real solar irradiations; and a platform which can be flexibly operated is provided for various solar high-grade utilization researches.