High pressure discharge lamp lighting device and projector

A high-pressure discharge lamp and lighting device technology, applied in the fields of projectors and high-pressure discharge lamp lighting devices, can solve the problems of extinguishing, flickering, unstable arc starting point, etc.

Inactive Publication Date: 2011-03-30
USHIO DENKI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] However, according to the above technique, when lighting a high-pressure discharge lamp, for example, when a lamp with a rated power of 180 W i

Method used

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  • High pressure discharge lamp lighting device and projector
  • High pressure discharge lamp lighting device and projector
  • High pressure discharge lamp lighting device and projector

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Embodiment Construction

[0108] Embodiments of the present invention will be described below.

[0109] exist figure 1 The middle represents the high-pressure discharge lamp which becomes the object of this invention.

[0110]The high-pressure discharge lamp 10 has an approximately spherical light-emitting portion 11 formed by a discharge vessel made of quartz glass. In the light emitting unit 11, a pair of electrodes 20 are arranged to face each other at a distance of 2 mm or less. In addition, sealing portions 12 are formed at both ends of the light emitting portion 11 . A conductive metal foil 13 made of molybdenum is airtightly buried in the sealing portion 12 , for example, by shrink sealing. The shaft portion of the electrode 20 is bonded to one end of the metal foil 13, and the external lead 14 is bonded to the other end of the metal foil 13, and power is supplied from an external power supply device.

[0111] Mercury, an inert gas, and a halogen gas are sealed in the light emitting unit 11...

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PUM

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Abstract

A high pressure discharge lamp lighting device can prevent the deformation of electrodes by stabilizing an arc start position of a discharge lamp under the condition of low-power operation of a high pressure discharge lamp with a mercury seal volume of 0.20mg/mm3. A lighting device which has a buck circuit (1) and a full-bridge circuit (2) can supply power to the high pressure discharge lamp (10) so as to lighten the high pressure discharge lamp. Under the condition of lightening with a rated power or a dimming power (which is about 60 to 80% of the rated power), a rectangle wave alternating current is supplied to the discharge lamp (10) for lighting. Besides, the high pressure discharge lamp can be lightened by supplying an asymmetrical rectangular wave alternated current in a driving period when the lamp is operated by electric power of 0.5P (W) or less, the maximum operation power P (W) in a steady lighting state except an initial lighting period is immediately after starting, a first polarity driving period of a rectangle wave alternating current is Ta (seconds), a second polarity driving period is Tb (seconds), the second polarity driving period Tb is 5 ms or less (Tb is less than or equal to 5 ms) and a ratio Tb/Ta of these two driving periods is 0.1 or less (Tb/Ta is less than or equal to 0.1).

Description

technical field [0001] The present 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 and its lighting device, wherein the high-pressure discharge lamp has a 0.2 mg / mm 3 The above-mentioned mercury has a relatively high mercury vapor pressure during lighting, for example, an AC lighting type high-pressure discharge lamp with a pressure of 110 atmospheres or more, and is suitable for use as a projection light source for projection projectors and rear projection TVs. Background technique [0002] Projection-type projectors are required to uniformly illuminate an image on a rectangular screen with sufficient color reproducibility. Therefore, metal halide lamps in which mercury and metal halides are sealed are used as light sour...

Claims

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Application Information

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IPC IPC(8): H05B41/24G03B21/14G03B21/20
CPCH05B41/2887G03B21/14Y02B20/202H05B41/39G03B21/2026Y02B20/00
Inventor 平尾哲治
Owner USHIO DENKI KK
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