Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Matsushita Electronics Corporation

Tsuyoshi Ichibakase

Tomoyuki Seki

Makoto Horiuchi

Kiyoshi Takahashi

Makoto Kai

Shinichiro Hataoka

Takashi Tsutatani

Mamoru Takeda

Kenichi Sasaki

Shinichi Yamamoto

Syunsuke Ono

Yuriko Kaneko

Masahiro Yamamoto

Katsushi Seki

Koichi Katase

Minoru Ozasa

Yoshitaka Kurimoto

Jun Sakaguchi

Haruo Nagai

Yasuo Takeuchi

Toshio Mori

Yoshiki Kitahara

Toshiyuki Shimizu

Go Yamada

Makoto Matsushita Electric Industrial Co Ltd Iproc Kai

Jun c/o Matsushita Electr Ind Co Lt Sakaguchi

In a high-pressure discharge lamp that includes a bulb formed from a light emitting part having a discharge space therein and a pair of sealing parts connected to the light emitting part, and an electrode pair disposed within the discharge space, a section of a proximity conductor is wound substantially spirally around one of the sealing parts within a predetermined range from the light emitting part, while the remaining section of the proximity conductor crosses over the light emitting part and is electrically connected to the electrode nearer the other sealing part. By initiating a discharge after applying a high-frequency voltage of 1 kHz to 1 MHz to a high-pressure mercury lamp having this structure, the breakdown voltage can be suppressed to at least 8 kV.

High-pressure discharge lamp, lighting method and lighting device for high-pressure discharge lamp, high-pressure discharge lamp device, and lamp unit, image display device and headlight device

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

An object of the present invention is to provide a lighting method and the like that can prevent a lamp temperature of each individual high-pressure mercury lamp from being beyond a proper temperature range of a halogen cycle. The lighting method maintains a discharge of the high-pressure mercury lamp that has a function of the halogen cycle. The control is performed as follows. From when the high-pressure mercury lamp is lighted up to when a lamp voltage Vla reaches a first voltage value V, a constant current control is performed. When the lamp voltage Vla reaches the first voltage value V, the constant current control is switched to a constant power control which is performed at a first power value W. While the discharge of the lamp is maintained, when the lamp voltage Vla reaches a voltage value (second voltage value V) at which a state of the halogen cycle deviates from a proper state, the constant power control is performed by reducing the first power value Wto a second power value W

Method of lighting high pressure mercury lamp, lighting device for the same, lamp system and projection display 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.

Method for manufacturing high pressure discharge lamp, high pressure discharge lamp manufactured using the method, lamp unit, and image display device

A lamp with a reflector comprises a high pressure discharge lamp and a reflector. The reflector has a first opening and a second opening. Clearance between a sealing portion of the high pressure discharge lamp and the second opening is substantially filled. The sealing portion includes a first glass portion extending from a luminous bulb and a second glass portion provided in the inside of the first glass portion, and the sealing portion has a portion to which a compressive stress is applied. Moreover, when the sealing portion is disposed to extend in a substantially horizontal direction, a portion of the reflector is formed with an air inlet for introducing an air flow striking against an upper portion of the luminous bulband then coming into a lower portion of the luminous bulb

High pressure mercury lamp with vented reflector and image projection apparatus

A method for manufacturing a high-pressure discharge lamp includes a process step in which a sealing portion is formed out of a side tube portion of a glass pipe that is designed for use in a discharge lamp. In the step of forming the sealing portion, a compound glass tube, which is composed of an outer tube made of a first glass and an inner tube made of a second glass whose softening point is lower than that of the first glass, is inserted into the side tube portion, which is also formed of the first glass. The side tube portion is then heated so that the side tube portion is brought in tight contact with the compound glass tube. Thereafter, at least the sealing portion is heated at a temperature higher than the strain point temperature of the second glass portion.

Method for manufacturing high-pressure discharge lamp, glass tube for high-pressure discharge lamp, and lamp element for high-pressure discharge lamp

A high pressure discharge lampcomprises a luminous bulbenclosing a luminous substanceinside and a sealing portionfor retaining the airtightness of the luminous bulb. The sealing portionhas a first glass portionextending from the luminous bulband a second glass portionprovided at least in a portion of the inside of the first glass portion, and further has a portion () to which a compressive stress is applied. In the luminous bulb, mercuric bromide (HgBr) is enclosed.

Method for producing a high pressure discharge lamp, with sealing portion having first and second glass members

A glass pipefor a discharge lamp is prepared which includes a luminous bulb portionthat will be formed into a luminous bulb of a high pressure discharge lamp and a side tube portion. Subsequently, a glass membermade of a second glass having a softening point lower than that of a first glass constituting the side tube portionis inserted into the side tube portion, after which a getteris disposed in the side tube portion. Then, with the pressure inside the glass pipereduced, the side tube portionis heated to tightly attach the glass memberto the side tube portion, thereby forming a sealing portion.

A discharge lamp includes a luminous bulb in which a luminous material is enclosed and a pair of electrodes are opposed in the luminous bulb; and a pair of sealing portions for sealing a pair of metal foils electrically connected to the pair of electrodes, respectively. At least one of the pair of metal foils has a twist structure.

Discharge lamp, method for producing the same and lamp unit

The formation step of a sealing portionincludes the substeps of inserting, into the side tube portion, a glass membermade of a second glass having a softening point lower than that of a first glass constituting the side tube portion; tightly attaching forward and backward portions (A and C) of the glass memberto the side tube portionby heating the side tube portionwhen the glass memberis divided into the forward portion, the backward portion, and a central portion under the assumption that the side of the glass membercloser to a luminous bulb portionis the forward side, thereby forming a cavitybetween at least a portion of the central portion (B) and the side tube portion; and heating, after the attachment step, a portion including at least the glass memberand the side tube portionat a temperature higher than the strain point temperature of the second glass.

High pressure discharge lamp, method for producing the same and lamp unit

A high pressure discharge lamp with a trigger wire wound around a side tube portion has the structure in which the side tube portion has a first glass portion extending from a luminous bulb and a second glass portion provided in at least a portion of the inside of the first glass portion, and in which the second glass portion contains at least one substance of Li, Na, and K of from 0.001 wt % to 1.0 wt % inclusive. This structure provides a high pressure discharge lamp operable with a drastically reduced starting voltage.

High pressure discharge lamp

A reflecting-mirror-equipped lampis constituted by a high pressure discharge lampand a reflecting mirror. The reflecting mirrorincludes a wide openingand a narrow opening. A first sealing portionof the high pressure discharge lampis fixed near the narrow portionof the reflecting mirror, and provided with no base. A second sealing portionof the high pressure discharge lampis provided at a side of the wide openingof the reflecting mirror. An external leadof the first sealing portionand an outward-drawn lead wireare joined to each other by the plastic flow of a caulking member

Lamp with reflecting mirror and image projecting apparatus

A reflecting-mirror-equipped lampincluding a high pressure discharge lampand a reflecting mirror. An openingof the reflecting mirroris provided with a front glassand two air holes (and) are formed through the reflecting mirror. The air holes (and) are provided on a cross section () including a luminous bulb. If the cross sectionis divided into regions (I through IV) consisting of first, second, third and fourth quadrants with respect to the luminous bulb, the air holes (and) are respectively provided in two quadrants diagonal to each other, i.e., in the first and third quadrants, respectively, or in the second and fourth quadrants, respectively.

A high pressure discharge lamp includes a luminous bulb enclosing a luminous substance therein; and a sealing portion for retaining airtightness of the luminous bulb. The sealing portion has a first glass portion extending from the luminous bulb and a second glass portion provided at least in a portion inside the first glass portion, and the sealing portion has a portion to which a compressive stress is applied.

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Osaka, Japan

Tsuyoshi Ichibakase