Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Matsushita Electric Works, Ltd.

Atsushi Utsubo

Yukiya Kanazawa

Hiroshi Nohara

Nobuyoshi Takeuchi

Mikio Miura

Shunsuke Kakisaka

Makoto Kai

Makoto Horiuchi

Masahito Yoshida

Kiyoshi Takahashi

Hiroshi Fujita

Kenichi Fukuda

Yoshiharu Nishiura

Kazuhiko Itoh

Koji Yamashita

Akio Takubo

Jun Tominaga

Makoto c/oMatElecInd Co Ltd Iproc Kai

A drive circuit is a drive circuit for turning on an LED and includes a self-excited inverter supplying power to the LED, wherein the self-excited inverter includes thermistors, and supplies, depending on temperature dependency of the thermistors, the first power value to the LED when a temperature is the first temperature, and the second power value to the LED when a temperature is the second temperature higher than the first temperature, and the second power value is smaller than the third power value that a circuit which is not provided with the thermistors and supplies the first power value to the LED when the temperature is a first temperature supplies to the LED when a temperature is the second temperature.

Drive circuit, illumination light source, and lighting apparatus

A lamp () has an inner tube () pinch sealed at one end to form a pinch seal (), to which a base () is attached. The base () has a pair of base pins () provided in parallel to the axis of the inner tube (). A pair of connection wires () that extend out from the pinch seal () are inserted into the respective base pins () and are fixed by concavities located in a portion of the base pins (). Each of the concavities is concave in a direction orthogonal to the base pins () and parallel to an imaginary plane that traverses central axes of the base pins ().

Lamp comprising glass tube having pinched sealed portion at end

The present invention aims to provide a metal vapor discharge lamp that has an outer tube less likely to break, and that is obtained at low manufacturing cost. A metal vapor discharge lampcomprises: an outer tubehaving an open end portionat one end and a closed end portionat another end; an inner tubehoused in the outer tube; a discharge tubehoused in the inner tube; and a baseattached to the open end portionof the outer tube, wherein relationships of t&#x2267;1.1&#xd7;d; 0&#x3c;d; and 0.3&#x2266;t are satisfied, where t denotes a minimum thickness, in millimeters, of the closed end portionof the outer tube, d denotes a shortest distance, in millimeters, in a direction of a longitudinal axis of the outer tube, between an inner surfaceof the closed end portionof the outer tubeand an outer surfaceof an end portionof the inner tube, the end portionbeing located opposite from the base

Metal vapor discharge lamp and lighting apparatus

A lamp having: an arc tube () including a main tube portion and a pair of thin tube portions () provided at ends of the main tube portion; and an adjacent conductor () including a strip-shaped metal plate. In the adjacent conductor (), a portion of the metal plate in the direction of length thereof, from the middle of the metal plate to just before an edge thereof, is a gripping portion () having a shape suitable for gripping the outer circumferential of one of the thin tube portions (). One end of the gripping portion () is a free end. The gripping portion () is disposed along an outer circumferential surface of the thin tube portion () so as to be in contact with the outer circumferential surface, and is elastically deformable in accordance with expansion in the radial direction of the thin tube portion ().

High-intensity discharge lamp

A metal halide lamp according to the present invention includes: a main tube () made of a light-transmitting ceramic and forming a part of an arc tube; a first thin tube () coupled to a first end of the main tube (); a second thin tube () coupled to a second end of the main tube (); a pair of electrodes (), which are inserted into the first and second thin tubes (), respectively, such that the far ends thereof face each other inside the main tube (); and a first metal halide enclosed in the arc tube. A second metal halide, which has a lower vapor pressure than that of the first metal halide, is further enclosed in the arc tube. And the main tube () has portions, of which the inside diameter decreases monotonically toward the ends.

Metal halide lamp with light-transmitting ceramic arc tube

A high pressure discharge lamp includes an outer tubular bulb whose inner space is exhausted to a vacuum; an arc tube contained in the outer tubular bulb; and a voltage reducing switching element for reducing a voltage applied to the arc tube. The voltage reducing switching element includes a heat sensitive switching element and a starting-voltage reducing element which are connected in series. During a period in which the heat sensitive switching element has a predetermined temperature or higher, the heat sensitive switching element is closed to electrically connect the arc tube and the voltage reducing switching element in parallel, so that the starting-voltage reducing element is operated. During a period in which the heat sensitive switching element has a temperature lower than the predetermined temperature, the heat sensitive switching element is opened so that the starting-voltage reducing element is not operated.

High pressure discharge lamp

A metal halide lamp of the present invention has an arc tube formed of ceramic and a pair of opposing electrodes. This lamp includes a Pr (praseodymium) halide, a Na (sodium) halide, and a Ca (calcium) halide enclosed within the arc tube. The Pr halide content Hp [mol], the Na halide content Hn [mol], and the Ca halide content Hc [mol] satisfy the relationships of 0.4&#x2266;Hc/Hp&#x2266;15.0 and 3.0&#x2266;Hn/Hp&#x2266;25.0.

Metal halide lamp

Disclosed is a lighting system capable of preventing damage to an outer-tube resulting from an outer-tube discharge that often occurs at the end of useful life of a lamp. The lighting system includes: a metal halide lamp having an arc tube housed within an outer tube; and a lamp .lighting device for operating the metal halide lamp. The lamp lighting device includes: a power supply unit operable to supply an electric power to the metal halide lamp; a detecting unit operable to detect an electrical property of the metal halide lamp; a judging unit operable to judge, based on the detected electrical property, whether a currently occurring discharge is an outer-tube discharge; and an instructing unit operable to instruct the power supply unit to suspend or reduce the electric power supply to the metal halide lamp upon a judgment that the currently occurring discharge is an outer-tube discharge. The detection unit detects a lamp voltage. The judging unit judges that the currently occurring discharge is an outer-tube discharge if the detected lamp voltage differs from a lamp voltage under normal operation.

Lighting system

he present invention aims at providing a metal halide lamp having a configuration to achieve the following goals: to prevent the lamp from burning out during the life due to a rise in lamp voltage; and to obtain high luminous efficiency at the same time. The metal halide lampcomprises: an arc tubemade of translucent ceramic and having a main tube partin which a pair of electrodesis disposed; and an outer tubehousing the arc tubetherein. 4.0&#x2266;L/D&#x2266;10.0, where L (mm) is a length of a space between the electrodesand D (mm) is an internal diameter of the main tube part. R/r &#x2267;3.4, where R (mm) is an internal diameter of the outer tubeand r (mm) is an external diameter in the main tube partof the arc tube, within a region positionally corresponding to, in a radial direction of the outer tube and the arc tube, the space between the electrodes, on a cross-sectional surface where an outer circumference of the arc tubecomes closest to an inner circumference of the outer tube. M&#x2266;4.0, where M (mg/cc) is a density of mercury enclosed in the arc tube

Metal halide lamp and luminaire

Arc tube for a high intensity discharge lamp

A high-pressure discharge lamp having a support structure for supporting a light emission tube so as to restrict its displacement in a direction perpendicular to the axis line thereof. A pair of thermal-stress generation members generates thermal stresses due to a temperature change at a time of switching the high-pressure discharge lamp from an on status to an off status. The thermal stresses acts as forces directed downward in a vertical direction and outward with respect to the light emission tube on side tube portions of the light emission tube arranged in a posture where the axis line extends in a horizontal direction.

Growing community of inventors

Osaka, Japan

Atsushi Utsubo