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Projection type image display device

A technology for image display and image display components, which is applied in the field of projection image display devices and can solve problems such as dust ingress

Inactive Publication Date: 2009-10-07
MAXELL HLDG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, if the air outside the equipment is sucked in and sent into the equipment, there is a risk of dust outside the equipment entering the device, so a dust filter is usually installed.

Method used

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  • Projection type image display device
  • Projection type image display device
  • Projection type image display device

Examples

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Effect test

Embodiment Construction

[0024] Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In each figure, elements having common functions are denoted by the same symbols, and descriptions of components that have already been described are omitted.

[0025] figure 1 It is a schematic diagram for explaining the principle of this embodiment easily. The mechanical dust removal filter 1 (pre-filter) provided on the main body of the equipment blocks the dust with a relatively large size (for example, more than 500 μm) among the dust a floating in the air. Then, a corona discharge is generated between the positive (high voltage) side electrode 3 of the high voltage power supply 8 provided at the charging portion 6-1 and the negative (ground) side electrode 2-1 thereof, so that the dust b is positively charged, and the dust b is positively charged in the current collection. The positive electrode (high voltage) side electrode 4 of the high voltage p...

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PUM

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Abstract

The present invention provides a projection type image display device, capable of preventing dusts inducted by a fan from the outer of the device from entering the device, even though the dust enters the device, it will not be attached to an image display element or an optical component, so as to maintain a good performance for a long time. A front filter stopping mechanically large particle dusts, a dust electrified part composed of a discharged electrode and a contraposition electrode, a dust collection part composed of an high-voltage electrode and a dust collection electrode for collecting the electrified dust from the dust electrified part, an electrified main filter for collecting dusts from air through the dust collection part mechanically, an electricity remover for implementing a charge neutrality to the ionization dust, an air blower for absorbing the air to cool part of an component of the light optical system and the image display element by a cooling fan, are all arranged an air inhalant side.

Description

technical field [0001] The invention relates to a projection type image display device, which has an image display element and an illumination optical system, modulates the light beam obtained through the illumination optical system through the image display element, and projects the image on the screen, such as a liquid crystal projection device and a reflector type image display projection device, especially the projection type that is equipped with an electric dust collector and a mechanical dust filter or a mechanical dust filter and an electrostatic dust filter at the air inlet for cooling the lighting optical system and the image display element Image display device. Background technique [0002] The projection type image display device has the following structure, that is, the light beam emitted from the light source is modulated by the image display element, that is, the liquid crystal panel or reflective liquid crystal panel, and the reflective image display element...

Claims

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Application Information

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IPC IPC(8): G03B21/14G03B21/16B03C3/04B03C3/40H05F3/06H05F3/00B01D50/00
Inventor 乾真朗平田浩二
Owner MAXELL HLDG LTD
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