Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Hiroki Ogawa

Jun Sakaguchi

Yoshiki Kitahara

Masahiro Yamamoto

Syunsuke Ono

Kazuyuki Okano

Kazunori Ohta

Tamotsu Ishikawa

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

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

The present invention provides a high pressure discharge lamp with a start-up assist member, a lamp unit, and a lamp system that reduce breakdown voltage and provide high design flexibility by reducing restriction on a position of an adjacent conductor. In a high pressure discharge lamp () of a lamp unit (), a dielectric member () is on the outer surface of a first sealing part (). The dielectric member () made of a titanium compound has relative permittivity higher than that of fused quartz. An upstream end of a metal wire () is connected to an external lead wire () projecting from a second sealing part (). A downstream end (A) is in contact with the dielectric member (). Upon lighting of the lamp, a corona discharge occurs at the point where the end () is in contact with the dielectric member () so that breakdown voltage is reduced.

Growing community of inventors

Osaka, Japan

Hiroki Ogawa