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High pressure discharge lamp lighting apparatus and projector

A technology for high-pressure discharge lamps and lighting devices, which is applied to the fields of projectors and high-pressure discharge lamp lighting devices, can solve problems such as the stability of arc bright spots.

Inactive Publication Date: 2011-04-20
USHIO DENKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] However, according to the above technique, for example, when a high-pressure discharge lamp with a rated power of 180W is turned on at 90W, no combination of frequencies can stabilize the arc bright spot, and many so-called flickering phenomena and interruptions occur.

Method used

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  • High pressure discharge lamp lighting apparatus and projector

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Embodiment Construction

[0068] Embodiments of the present invention will be described below.

[0069] figure 1 The high-pressure discharge lamp which is the object of this invention is shown.

[0070] The high-pressure discharge lamp 10 has a substantially spherical light emitting portion 11 formed of a discharge vessel made of quartz glass. A pair of electrodes 20 are arranged facing each other at a distance of 2 mm or less in the light emitting unit 11 . In addition, sealing portions 12 are formed at both end portions of the light emitting portion 11 . A conductive metal foil 13 made of molybdenum is hermetically buried in the sealing portion 12 , for example, by shrink sealing. The shaft portion of the electrode 20 is joined to one end of the metal foil 13 , and an external lead 14 is joined to the other end of the metal foil 13 to supply power from an external power supply device.

[0071] Mercury, a rare gas, and a halogen gas are sealed in the light emitting unit 11 . Mercury is used to o...

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Abstract

The present invention provides a high pressure discharge lamp lighting apparatus and a projector, which restrains an interruption when an extra low power is used for converting an ultra low power to a rated power when the high pressure discharge lamp operates. Lighting is performed through supplying power to the high pressure discharge lamp from the lighting apparatus with a step down chopper circuit and a full bridge circuit. When lighting is performed with the rated power or modulated light power, a rectangle wave alternating current is supplied to the discharge lamp for performing lighting. Additionally, when the lighting is performed with a power less than 50% of the rated power consumption, a rectangle wave alternating current comprises a first time unit and a second time unit, and wherein the discharge lamp is driven by repeating the first and second time units, and the first time unit has a time width t1 and the second time unit is formed by repeating a time width t2, five times or more.

Description

technical field [0001] The invention relates to a high-pressure discharge lamp lighting device and a projector equipped with the high-pressure discharge lamp lighting device. In particular, the present invention relates to a high-pressure discharge lamp lighting device and a projector equipped with the high-pressure discharge lamp lighting device comprising a high-pressure discharge lamp in which 0.15 mg / mm 3 The above mercury, and the high mercury vapor pressure when lighting is high, for example, 11 MPa or more AC lighting type high-pressure discharge lamp, is suitable as a projection light source for a projection projection device or a rear projection TV. Background technique [0002] Projection-type projectors are required to illuminate images with uniform and sufficient color rendering on a rectangular screen, so metal halide lamps in which mercury and metal halides are sealed are used as light sources. In addition, recently, miniaturization and point light sources hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B41/24G03B21/20
CPCH05B41/2883G03B21/20Y02B20/202G03B21/2026G03B21/2053H05B41/2888Y02B20/00
Inventor 平尾哲治上原理彰今村笃史山田宏二岩林弘久
Owner USHIO DENKI KK
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