US Patent No. 9,118,847

DUSTPROOF STRUCTURE OF IMAGE GENERATION DEVICE, AND PROJECTION DISPLAY DEVICE


Patent No. 9,118,847
Issue Date August 25, 2015
Title Dustproof Structure Of Image Generation Device, And Projection Display Device
Inventorship Yusuke Tani, Tokyo (JP)
Takayuki Okada, Tokyo (JP)
Assignee NEC DISPLAY SOLUTIONS, LTD., Tokyo (JP)

Claim of US Patent No. 9,118,847

1. A dustproof structure of an image generation device, the structure comprising:
image generation devices, one each corresponding to red, green, and blue;
an air duct for red, an air duct for green, and an air duct for blue provided, so as to individually blow cooling air to said
image generation devices;

a first air filter provided for each of said air duct for red, said air duct for green, and said air duct for blue; and
a second air filter provided for at least one air duct of said air duct for green and said air duct for blue, the second air
filter having a filter mesh size smaller than that of said first air filter,

wherein, in a configuration in which said second air filter is provided in both of said air duct for green and said air duct
for blue, said second air filter that is provided in said air duct for blue has a filter mesh size smaller than that of said
second air filter that is provided in said air duct for green.