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US 9,316,895 B2Granted
Image projection apparatus with an enclosure and air supply
AssigneeRicoh Company, Ltd.
InventorYoshio Kubo
Life of this patent
Estimating the term…
Abstract
An image projection apparatus includes an optical part disposed in a light path of an projection image; an enclosing unit to enclose the light path of the projection image and having an window for projecting the projection image onto a projection plane; and an air supply unit to supply air into an internal space of the enclosing unit enclosing the light path. Pressure of the internal space of the enclosing unit is kept at a positive pressure with respect to an external pressure of the enclosing unit during an image projection operation.
Claims17
An image projection apparatus comprising:
- a reflection mirror and a curved mirror disposed in a light path of an projection image;
- an enclosure to enclose the light path of the projection image and having an window for projecting the projection image onto a projection plane;
- and
- an air supply which supplies air into an internal space of the enclosure enclosing the light path,
- wherein pressure of the internal space of the enclosure is kept at a positive pressure with respect to an external pressure of the enclosure during an image projection operation, and
- wherein the enclosure includes a top plate including the window, a mirror bracket which retains the reflection mirror and the top plate, a free mirror bracket which retains the curved mirror, and a mirror holder which holds the mirror bracket and the free mirror bracket.
3 more elements
Dependencies are inferred from the claim text.