| IWASAKI ELECTRIC CO., LTD. Patent applications |
| Patent application number | Title | Published |
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| 20120126696 | METAL HALIDE LAMP - A metal halide lamp having a luminous tube formed of translucent alumina as translucent ceramic in which additives of halides are sealingly included to emit at least red, blue and green light components, wherein an energy rate of a red light component is set to 55% to 75% and an energy ratio of a blue light component is set to 15% to 25%. | 05-24-2012 |
| 20120091875 | LIGHT SOURCE DEVICE - A necessary and sufficient amount of a UV-light is radiated to a high pressure discharge lamp for enabling reliable improvement in the starting performance by a starting light source of a simple configuration not increasing the manufacturing cost. | 04-19-2012 |
| 20120069578 | ILLUMINATING DEVICE - An illuminating device that can reduce illuminance unevenness of an irradiation target face with a simple construction is provided. In a pseudo sunlight illuminating device | 03-22-2012 |
| 20120056533 | CERAMIC METAL HALIDE LAMP - High color rendition (Ra≧80) and high efficiency (η≧100 (1 m/W)) which are effects conflicting to each other in a metal halide lamp are attained. An arc tube formed of translucent ceramics, capillaries are formed continuously on the both ends of an arc chamber formed substantially in an ellipsoidal shape in the direction of the longitudinal axis by way of a transition curve with no angled corner, and the arc tube is designed to effective length L/effective inner diameter D of 1.8 to 2.2, and formed to such a size that the lowest temperature of the arc chamber is 800° C. or higher and the highest temperature of the arc chamber is 1200° C. or lower during lighting, and at least thulium iodide, thallium iodide, sodium iodide, and calcium iodide are sealed as metal halides where sodium iodide and calcium iodide are sealed by a molar ratio of 40 to 80% and less than 30%, respectively, based on the entire metal halides. | 03-08-2012 |
| 20120025731 | BALLAST FOR HIGH PRESSURE DISCHARGE LAMP - The present invention provides a ballast for a high pressure discharge lamp including a driving circuit for supplying an alternating power to a high pressure discharge lamp. In the ballast of the present invention, the high pressure discharge lamp includes: a bulb; and a startup light source disposed in a vicinity of the bulb and assisting ignition of the bulb. The startup light source has a pair of electrodes which are capacitively coupled. The driving circuit includes: a bridge unit for inverting a lamp current; a current regulator unit for regulating the lamp current; and an igniter unit for generating an ignition voltage. At the ignition, a voltage containing a frequency component higher than a driving frequency during a steady driving of the bulb is applied to the startup light source. | 02-02-2012 |
| 20120025688 | LIGHT SOURCE DEVICE - A start assisting light source is configured such that it can be mounted simply and reliably at a position capable of efficiently radiating UV-light for enhancing the starting performance of a high pressure discharge lamp to discharge chamber without being heated to a high temperature during lighting of the lamp and also adopted to a simple constitution of not increasing the manufacturing cost. A start assisting light source includes an airtight vessel filled with a rare gas and a pipe member that penetrates through the vessel is mounted to an electrode lead which protrudes from the end face of an electrode seal portion secured to a bottom hole of the concave reflector by inserting the electrode lead through the pipe member. | 02-02-2012 |
| 20120001595 | CHARGING DEVICE - A charging device supplies charge current to a battery group having plural secondary batteries connected in series to perform charging. In the charging device, a discharge route circuit for discharging charge current to be supplied to the secondary battery when the battery voltage of the secondary battery exceeds a predetermined voltage while charging is provided to every secondary battery. Also provided is a cut-off circuit for cutting off the discharge route circuit from each secondary battery after charging is completed. Discharge at a discharge route circuit is suppressed and energy efficiency is increased. | 01-05-2012 |
| 20110298369 | METHOD OF MANUFACTURING LAMP AND QUARTZ BULB - It is intended to enable accurate positioning of an electrode top end such that the arc length is constant and prevent leakage from sealing portions due to bending or twisting of a molybdenum foil upon sealing an electrode mount by heating the sealing portion. For attaining the object described above, a quartz bulb in which extension tubes each having an inner diameter larger than the inner diameter of the opening of a body tube is welded the openings of both ends of a body tube formed with light emitting portion and a sealing portion thereby forming to a positioning step is used, and electrode mounts each formed with a positioning engagement portion at a position spaced apart by a predetermined length from the electrode top end are inserted to engage the positioning engagement portion of the electrode mounts to the positioning step and, in this state, the sealing portions are sealed. | 12-08-2011 |
| 20110260600 | LAMP DEVICE - A light utilization efficiency of a high-pressure discharge lamp is improved even in a case of reducing the size of a reflection mirror without using an auxiliary reflection mirror. In a lamp device where a portion of lights emitted from a discharge bulb to the periphery thereof in forward and backward directions for a predetermined range of angle is reflected at a concave reflection mirror and illuminated to a light collection area of a predetermined size formed forward of the lamp, a prism surface having an angle of refracting or deflecting at least a portion of lights emitted from the discharge bulb that is not reflected at the concave reflection mirror to the light collection area is formed to the outer peripheral surface of the discharge bulb. | 10-27-2011 |
| 20110204765 | LIGHT SOURCE DEVICE - A light source apparatus is capable of reliably enhancing the starting performance of a high pressure discharge lamp even during hot state just after extinguishing the high pressure discharge lamp by radiating a necessary and sufficient amount of a UV-light into a discharge bulb of the lamp using an UV-enhancer of a simple constitution without increasing the manufacturing cost is provided. An UV-enhancer for radiating a UV-light to a discharge bulb for enhancing the starting performance of a high pressure discharge lamp upon starting lighting includes a discharge tube connected in parallel to a lighting circuit of the lamp, and an external electrode of the discharge tube is formed as a metal holder that holds the outer periphery of the discharge tube so as to oppose the end face of an electrode seal portion of the lamp inserted through a bottom hole in a concave reflector and secures the electrode seal portion to an electrode lead protruding from the end face thereof. | 08-25-2011 |
| 20110169454 | CHARGING APPARATUS AND CHARGING METHOD - The present invention aims to suppress waste of charging power during charging and improve charging efficiency. | 07-14-2011 |
| 20110169453 | CHARGING APPARATUS AND CHARGING METHOD - The present invention aims to reliably prevent overcharge by carrying out charging in just proportion during charging periods. | 07-14-2011 |
| 20110121725 | ELECTRODE FOR HIGH PRESSURE DISCHARGE LAMP, HIGH PRESSURE DISCHARGE LAMP, AND METHOD FOR MANUFACTURING ELECTRODE FOR HIGH PRESSURE DISCHARGE LAMPTECHNICAL FIELD - Provided is an electrode for a high pressure discharge lamp, which prevents spring-back of an electrode coil, and which has high productivity and high accuracy in positioning the coil. The electrode for the high pressure discharge lamp includes: an electrode core bar ( | 05-26-2011 |
| 20110117805 | METHOD FOR MANUFACTURING HIGH PRESSURE DISCHARGE LAMP - Provided is a manufacturing method to prevent devitrification of a bulb in a high pressure discharge lamp used for a projector. The method is for manufacturing a high pressure discharge lamp which uses, as a light source, a bulb made of fused quartz and including a tungsten electrode, and which is horizontally installed when the lamp is driven for actual use. The method includes the step of initially driving the bulb with an optical axis thereof being set horizontally before the high pressure discharge lamp is shipped. In the initial driving step, the rotation angle around the optical axis of the bulb is offset by 45° or more and 135° or less relative to the rotation angle around the optical axis of the bulb when the lamp is driven for actual use. | 05-19-2011 |
| 20110084587 | LIGHT SOURCE DEVICE - The invention relates to a light source device having a high-voltage discharge lamp ( | 04-14-2011 |
| 20110037385 | ELECTRODE FOR ULTRA-HIGH PRESSURE MERCURY LAMP AND ULTRA-HIGH PRESSURE MERCURY LAMP - Disclosed is a tungsten electrode for ultra-high pressure mercury lamps comprising an electrode rod, a first coil wound around the front end side of the electrode, and a second coil wound around the electrode rod starting from the end of the first coil. The tungsten wire of the first coil is smaller in diameter than the tungsten wire of the second coil. | 02-17-2011 |
| 20110025223 | HIGH PRESSURE DISCHARGE LAMP BALLAST AND LIGHT SOURCE APPARATUS - Even when usable driving frequencies are limited, a lamp voltage is appropriately controlled. A high pressure discharge lamp ballast performs driving with a synthesized current waveform comprising a combination of first and second sets of current waveforms. The ballast includes: a control means for controlling content rates of each of the sets per unit time; a detection means for detecting a rotation synchronization signal for a color wheel; an output means for applying a synthesized current waveform in accordance with the synchronization signal and the content rates to a high pressure discharge lamp; and a detection means for detecting a lamp voltage. The sets are each in a waveform inverted so as to correspond to at least one of a rotational speed and segment positions of color wheel. A period of each of the first and second sets has a length equivalent to one rotation of the color wheel. The number of inversions of the second set is larger than the number of inversions of the first set. The ballast is configured in that the content rate of the second set is set to R | 02-03-2011 |
| 20110025222 | HIGH PRESSURE DISCHARGE LAMP BALLAST AND LIGHT SOURCE APPARATUS - In a frequency control for a high pressure discharge lamp ballast, short-term increase and decrease of a lamp voltage are suppressed. The high pressure discharge lamp ballast drives a high pressure discharge lamp with a synthesized-waveform alternating current made of multiple frequency components, the high pressure discharge lamp having a pair of electrodes disposed to face each other. The ballast includes: a control means for controlling a component contained ratio of the multiple frequency components per unit time; an output means for applying a synthesized-waveform current in accordance with the component contained ratio to the high pressure discharge lamp; and detection means for detecting a lamp parameter of the high pressure discharge lamp. The control circuit is configured to shift the component contained ratio to a first component contained ratio when the lamp parameter is in a first state, and shift the component contained ratio to a second component contained ratio when the lamp parameter is in a second state. The control circuit is configured to change the component contained ratio stepwise when the component contained ratio is shifted from the first component contained ratio to the second component contained ratio, or when the component contained ratio is shifted from the second component contained ratio to the first component contained ratio. | 02-03-2011 |
| 20100321933 | PROJECTOR DEVICE, LAMINATE TYPE LIGHT-EMITTING DIODE DEVICE, AND REFLECTION TYPE LIGHT-EMITTING DIODE UNIT - A laminate type light emitting diode device having excellent heat radiation performance and high output capability is provided. A plurality of reflection type light emitting diode units | 12-23-2010 |
| 20100219752 | QUARTZ BULB FOR DOUBLE ENDED DISCHARGE LAMP - In a case of manufacturing a double ended discharge lamp, it is intended to decrease the manufacturing cost while maintaining identical lamp characteristic and lamp lifetime with those in a case of forming a quartz bulb with quartz at a high purity. | 09-02-2010 |
| 20100194260 | LAMP WITH OUTER BULB - A lamp with an outer bulb in which a base ( | 08-05-2010 |
| 20100157257 | HIGH PRESSURE DISCHARGE LAMP BALLAST, HIGH PRESSURE DISCHARGEP LAMP DRIVING METHOD, AND PROJECTOR - A high pressure discharge lamp ballast includes an AC power supply means for supplying a square wave alternating current to a high pressure discharge lamp having a bulb in which first and second electrodes are disposed so as to face each other. In the high pressure discharge lamp ballast, one modulation period (T | 06-24-2010 |
| 20100007264 | LAMP - A lamp in which an inner bulb containing a light emitting tube or a light emitting filament and an outer bulb containing the inner bulb are attached coaxially to a base, and a spacer made of a thin metal sheet is attached to an exhaust tube protruding from a central region at the top end of the inner bulb coaxially supporting the inner bulb to the outer bulb. The spacer has a central plate formed with an aperture allowing the exhaust tube to be inserted through the central plate, and a plurality of fingers protruding inward along the inner periphery of the aperture, and three or more strips, each branched radially outward from the central plate and formed in a curved shape coaxially supporting the inner bulb and the outer bulb | 01-14-2010 |
| 20090315462 | Metal Halide Lamp - A metal halide lamp capable of delaying the rate of deformation in an electrostrictive phenomenon caused by the discharge of a ferroelectric ceramic capacitor when dielectric breakdown is initiated between the electrodes of an arc tube thereby preventing breakage accident, wherein a starting circuit, housed in parallel connection together with an arc tube in an outer tube of a metal halide lamp has in serial connection, a ferroelectric ceramic capacitor that is charged and discharged when a voltage at a predetermined coercive voltage or higher is applied thereby outputting a starting pulse at a high voltage from a ballast, a semiconductor switch that turns to a conduction state when a voltage of a predetermined breakover voltage or higher is applied, and a time constant control resistor that delays the discharge time of electric charges discharged from the capacitor when dielectric breakdown is initiated in the arc tube. | 12-24-2009 |
| 20090278435 | Lamp with outer tube | 11-12-2009 |
| 20090015797 | PROJECTOR DEVICE, LAMINATE TYPE LIGHT-EMITTING DIODE DEVICE, AND REFLECTION TYPE LIGHT-EMITTING DIODE UNIT - A laminate type light emitting diode device having excellent heat radiation performance and high output capability is provided. A plurality of reflection type light emitting diode units | 01-15-2009 |
| 20080246410 | Lighting Device and a Lighting Method for a High Pressure Discharge Lamp - Even in a high pressure discharge lamp causing temperature difference between electrodes when an AC current is supplied, the temperature difference is eliminated to suppress the arc movement, thereby suppressing flickering caused thereby during stable lighting. | 10-09-2008 |
