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US 6,280,036 B1Granted
Projection apparatus
AssigneeCanon Kabushiki Kaisha
InventorKazunori Suzuki
Life of this patent
Estimating the term…
Abstract
It is proposed to provide a projection apparatus capable of displaying an image by eliminating or reducing the influence of dust. The projection apparatus for projecting image information on a display surface such as a screen, comprises a dust preventive structure (prevention from attaching a foreign substance) of dusting main apparatus members such as an optical modulation device.
Claims15
A projection type display apparatus comprising:
- a display device;
- a projection optical system for projecting, on a plane, an image obtained by said display device, said projection optical system having a plurality of lenses;
- and
- sealing means for substantially sealing only a space between said display device and a lens of the plurality of lenses, disposed closest to said display device.
1 more element
Dependencies are inferred from the claim text.