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Projector

a technology of projection display and projector, which is applied in the field of projection display apparatus, can solve the problems of reducing the reliability of the apparatus, deteriorating the display quality, and less efficient cooling of the power unit, and achieve the effect of effective monitoring the temperatur

Inactive Publication Date: 2003-02-25
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

It is therefore an object of the invention to provide a projection display apparatus that includes a cooling system that efficiently cools the power unit and polarized light conversion device while preventing airborne debris from contaminating the apparatus.
Such a structure effectively monitors the temperature of the light source lamp unit while obviating wiring between the temperature-sensing element and the circuit board because the temperature-sensing element is directly mounted on the circuit board.

Problems solved by technology

Thus, the air introduced to the power unit is hotter than the fresh air introduced into the outer case, and is less efficient in cooling the power unit.
As a result, dust may adhere to the optical system and deteriorate the display quality, which reduces the reliability of the apparatus.
Thus, the device may not be efficiently cooled due to insufficient circulation of the cooling air in some apparatus configurations.

Method used

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Embodiment Construction

While the invention will hereinafter be described in connection with preferred embodiments thereof, it will be understood that it is not intended to limit the invention to those embodiments. On the contrary, it is intended to cover all alternatives, modifications and equivalents that may be included within the spirit and scope of the invention as defined by the appended claims.

For a general understanding of the features of the invention, reference is made to the drawings. In the drawings, like reference numerals have been used throughout to designate identical elements.

FIGS. 1(A) and 1(B) are a front view and a rear elevation view, respectively, of a projection display apparatus in accordance with a preferred embodiment of the invention FIGS. 2(A) and 2(B) are a plan view and a bottom view, respectively, of the projection display apparatus in accordance with the preferred embodiment of the invention.

As shown in FIGS. 1(A)-2(B), the projection display apparatus 1 in accordance with t...

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Abstract

A <DEL-S DATE="20030225" ID="DEL-S-00001" / >projection display device<DEL-E ID="DEL-S-00001" / > <INS-S DATE="20030225" ID="INS-S-00001" / >projector <INS-E ID="INS-S-00001" / >capable of improving cooling efficiency of the power unit includes a light source lamp unit, a projection lens unit, an exhaust fan provided near the light source lamp unit for ventilating an outer case, and a ventilating path provided inside the power unit. A suction fan is provided at the inlet of the ventilating path which is connected to the cooling air intake port through a duct cover to directly conduct fresh air into the ventilating path. Because the interior of the power unit is cooled by fresh air which is cooler than the air inside the outer case, cooling efficiency is enhanced.

Description

BACKGROUND OF THE INVENTION1. Field of the InventionThe invention relates to a projection display apparatus which separates light beams from a light source into red, blue and green light beams. The display apparatus modulates the red, blue and green light beams through light valves provided in a liquid crystal panel in response to image information. The modulated red, blue and green light beams are combined and expansively projected through a projection lens on a projection screen. In particular, the invention relates to a cooling system for efficiently and cleanly cooling the components of a projection display device that separates, modulates combines and projects light beams.2. Description of Related ArtConventional projection display devices include an optical unit which optically treats light beams emitted from a light source lamp unit to synthesize a color image in response to image information. The synthesized light beams are projected on a screen through the use of a projecti...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G03B21/00G02F1/133G03B21/14G03B21/16H04N5/74H04N9/31
CPCG02F1/133385G03B21/16H04N5/7441H04N9/3102H04N9/3105H04N9/3141H04N9/3144G03B21/145G03B21/006H04N5/74
Inventor FURUHATA, MUTSUYATAKIZAWA, TAKESHIFUJIMORI, MOTOYUKIKURODA, AKITOSHIHABA, SHINJIMIYASHITA, KIYOSHI
Owner SEIKO EPSON CORP
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