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Projection display device

A display device, projection technology, applied in projection devices, optics, instruments, etc., can solve problems such as noise

Inactive Publication Date: 2012-06-27
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the above-mentioned projection type display device, since the first exhaust fan and the second exhaust fan are arranged at a relatively short distance, it is easy to generate noise due to the resonance of the two exhaust fans during operation.

Method used

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Embodiment Construction

[0026] Embodiments of the present invention will be described below with reference to the drawings.

[0027] figure 1 It is a perspective view showing the external configuration of the projector. Referring to the drawings, the projector has a housing 1 constituting its outer shape. The case 1 is composed of three parts, an upper case 1a, a lower case 1b, and a front case 1c.

[0028] A projection window 2 is provided on the front left side of the casing 1 . Projection lens 3 faces forward from projection window 2 . Exhaust ports 4, 5 are formed on the front right side and the right side of the housing 1, respectively. The front air vent consists of a number of round holes. The exhaust port 5 on the side is composed of a plurality of louvers formed in the lateral direction and slit-shaped holes formed between the louvers. An operation unit 6 composed of a plurality of operation buttons is provided at the center of the upper surface of the housing 1 .

[0029] figure 2 ...

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Abstract

A projection display device includes a first exhaust fan mainly for exhausting air from a light source and a second exhaust fan mainly for exhausting air from components other than the light source. The second exhaust fan is arranged on an exhaust side of the first exhaust fan so as to overlap partly the first exhaust fan. In addition, a distance between the first exhaust fan and the second exhaust fan is set within a section in variation characteristic of a noise level of the projection display device with respect to the distance, in which the noise level does not vary even with a change in the distance.

Description

technical field [0001] The present invention relates to a projection display device that modulates light from a light source and enlarges and projects the modulated light. Background technique [0002] In projection-type display devices such as liquid crystal projectors, high-intensity light sources such as high-pressure mercury lamps are used. Since such a light source is very high temperature, it is necessary to use an exhaust mechanism with a high exhaust capacity in order to exhaust the heat from the light source. [0003] Patent Document 1 describes a projection display device that has a first exhaust fan mainly for exhausting air from a light source and a second exhaust fan mainly for exhausting air other than the light source, and is arranged as The second exhaust fan partially overlaps the exhaust side of the first exhaust fan. [0004] In this structure, a part of the exhaust gas from the first exhaust fan is introduced into the second exhaust fan. Thereby, air d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B21/16H05K7/20
CPCG03B21/16
Inventor 山本祐介
Owner SANYO ELECTRIC CO LTD