Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Jun Sakaguchi

Yoshiki Kitahara

Katsuhiro Ono

Syunsuke Ono

Hiroki Ogawa

Kiyoshi Takahashi

Makoto Horiuchi

Tsuyoshi Ichibakase

Tomoyuki Seki

Shinichiro Hataoka

Takashi Tsutatani

Yoshitaka Kurimoto

Kazunori Ohta

Toshiyuki Shimizu

Ryo Minamihata

Mitsuko Shuto

Yutaka Nishida

Tamotsu Ishikawa

Disclosed is a high-pressure discharge lamp () that reduces the occurrence of cracks even under high mercury vapor pressure. The high-pressure discharge lamp () is provided with a glass arc tube () including a light-emitting part () and a sealing part () connected to the light-emitting part (), the light-emitting part () enclosing a discharge space, and a pair of electrodes (), one end of each of the electrodes () facing one end of the other electrode () in the discharge space, and another end of each electrode () being embedded in the sealing part () and connected to a metal foil (), at least one embedded section of the pair of electrodes () including at least one projection ().

High-voltage discharge lamp, lamp unit, projection image display device, and method for manufacturing high-voltage discharge lamp

A high-pressure discharge lamp having an arc tube with a casing made of glass. The arc tube includes a light-emitting part and sealing parts connected to the light-emitting part. A pair of electrode rods are disposed within the glass casing such that their tips face each other with a gap therebetween and project into the discharge space, and their base ends are embedded in the sealing parts and overlap surfaces of metal foils provided in the sealing parts. Each base end is coated with a coating foil made of metal and having a C-like cross section with a slit formed between edges thereof. An end of the coating foil farthest from the light-emitting part is located closer to the light-emitting part than an end of the metal foil closest to the light-emitting part.

High-pressure discharge lamp having an arc tube in which a pair of electrode rods are disposed, lump unit, and projector-type image display apparatus

The projector uses two lamps, which are high-pressure discharge lamps with the same rated power, as light sources. The projector includes: a first alternating-current generator configured to generate a lamp current to be supplied to one of the lamps, based on an input control signal; a second alternating-current generator configured to generate a lamp current to be supplied to the other lamp, based on an input control signal; and a controller configured to control the lamp currents to have a same period and to be out of phase, by inputting a control signal to each of the first and the second alternating-current generators.

Dual high-pressure discharge lamp projector with multi-waveform current generation for greater luminous flux change control and extended lamp life

The present invention aims to prevent breakage of a sealing part and an electrode of a high pressure discharge lamp, and provides an electrodeused for a discharge lamp and having a rod-shaped part, one end of the rod-shaped partto be sealed by a sealing part of an arc tube of the discharge lamp, the other end of the rod-shaped partto be in a discharge space in the arc tube, wherein the rod-shaped parthas a rough surface that is composed of a plurality of types of crystal grains each having a different surface condition due to differences in crystal orientation.

Electrode used for discharge lamp, high pressure discharge lamp, lamp unit, and projection image display apparatus

A high-pressure discharge lamp comprising an arc tube, the arc tube including: a light-emitting part which is substantially ellipsoidal; and sealing parts which extend from either end of the light-emitting part and in which bases of electrodes are sealed, the arc tube enclosing 0.2 mg/mmto 0.4 mg/mmof mercury, the high-pressure discharge lamp having a power rating greater than 355 W and not greater than 600 W, wherein 5.4&#x2266;D&#x2266;5.8 and 3.1&#x2266;X&#x2266;D&#x2212;2.3 when 355&#x3c;P&#x2266;380, 5.8&#x2266;D&#x2266;6.2 and 3.1&#x2266;X&#x2266;D&#x2212;2.7 when 380&#x3c;P&#x2266;450, and 6.2&#x2266;D&#x2266;6.6 and 3.1&#x2266;X&#x2266;D&#x2212;3.3 when 450&#x3c;P&#x2266;600, where P denotes the power rating in watts of the high-pressure discharge lamp, D denotes an inside diameter in millimeters of the light-emitting partwith reference to a midpoint between the electrodes, and X denotes a wall thickness in millimeters of the light-emitting partwith reference to the midpoint between the electrodes

High-pressure discharge lamp, lamp unit, and projector-type image display apparatus

A high-pressure discharge lamp having an electrode including an electrode rod, a melted part and a coil part, and satisfying where La denotes an average value of a length in units of mm of an exposed portion of the coil part in an axial direction of the electrode rod, the exposed portion being not covered with the melted part, and L denotes a maximum value of a length in units of mm between a tip of a head of the electrode rod and an opposite edge of the coil part to the melted part, measured in the axial direction.

High-pressure discharge lamp and projector having the high-pressure lamp

A short arc high-pressure discharge lamp has an arc tubemade of quartz glass including a light-emitting portionthat fills mercury inside thereof and has a pair of electrodes arranged so as to face each other, and a sealing portionconnected to the light-emitting portion. The pair of electrodes have an electrode bar, one end of the electrode bar is located in an internal space of the light-emitting portion, and the other end of the electrode bar is embedded in the sealing portion and bonded to a conductive metal-foilsealed in the sealing portion. In at least a part of a portion of the electrode bar embedded in the sealing portion, the entire outer peripheral surface thereof is covered tightly with a metal-foil sleeve. A high efficiency and high quality lamp is obtained in which fracture in the sealing portion of the arc tube caused by an ultrahigh vapor pressure in the tube surely is suppressed over the lifetime of the lamp, and the vapor pressure in the arc tube is elevated up to 30 MPa or more.

High-pressure discharge lamp, lamp unit using the same, and projection-type image display device using the lamp unit

The present invention is directed to a method for manufacturing a high-pressure discharge lamp including: a spherical portion forming a light-emitting portion (); sealing portions that are connected with both ends of the spherical portion; an electrode () that is sealed to each of the sealing portions; and a metal foil () that is connected with a rear end of each electrode. A vessel provided with a cylindrical glass tube () on both ends of the spherical portion is used, a connection structure of the metal foil and the electrode are disposed in the glass tube such that a front end of the electrode is positioned in the spherical portion, and the glass tube is melted by heat and shrunk for sealing the metal foil and the electrode so as to form the sealing portion. An inner diameter &#x3c6; of the glass tube before the heat-melt processing and a distance L from an edge of the metal foil to the internal space of the spherical portion are set to satisfy a relationship of L/&#x3c6;&#x2267;1.35, a corner of an edge portion of the metal foil on a side of the connection with the electrode is cut so as to form a wedge shape (), and subsequently the sealing step is performed. Thereby, it can suppress the generation of the breakage during the lighting life span, which is caused by a gap generated from the metal foil to an axis of the electrode during the sealing processing of the high-pressure discharge lamp having a high brightness property.

Method for manufacturing high-pressure discharge lamp, high-pressure discharge lamp, lamp unit and projection-type image display

A manufacturing method of a high-pressure mercury lamp includes an electric field application step in which an electric field is applied to at least a light emission part () with the high-pressure mercury lamp being kept at a high temperature. This can reduce impurities such as hydrogen and alkali metals in a discharge space () and glass forming the light emission part (). As a consequence, blackening and devitrification of the high-pressure mercury lamp while the lamp is lit can be reduced.

Manufacturing method of high-pressure discharge lamp, high-pressure discharge lamp, lamp unit using high-pressure discharge lamp, and image display apparatus using high-pressure discharge lamp

A long-life high-pressure discharge lamp can (i) suppress damage to sealing portions, especially at an initial stage of the accumulated lighting time, (ii) allow for easy assembly of components such as electrodes and (iii) prevent deformation/ripping of metallic foils. An arc tube is a glass enveloping vessel with electrodes arranged therein, and includes: a light emitting portion in which materials are enclosed and a discharge space is formed; and sealing portions provided at ends of the light emitting portion. Each electrode includes an electrode bar whose first end is in the discharge space, and whose second end is in the corresponding sealing portion and connected to a metallic foil. The second end of each electrode bar is partially wrapped around by a sleeve-like metallic cover foil that has a cut-out section positioned over a joining area where the second end of each electrode bar is joined to the metallic foil.

High-pressure discharge lamp, lamp unit using the same, and projective image display device using the lamp unit

A method for manufacturing a high pressure mercury lamp having a high pressure resistance strength includes an electric field application step of applying an electric field to at least a light emitting part while keeping the high pressure mercury lamp at a high temperature. As a result of the electric field application step, impurities such as hydrogen and an alkali metal existing in a discharge space and in glass used for forming the light emitting part () and sealing parts () can be reduced, with it being possible to suppress blackening and devitrification during lighting.

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Osaka, Japan

Jun Sakaguchi