Projection apparatus, elevation angle control method...

Details Projection apparatus, elevation angle control method... Projection apparatus, elevation angle control method...

2007-01-19

2009-10-27

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

07609458

ABSTRACT:
A projection apparatus includes a distance measuring unit that measures a distance to a screen on which an image is to be projected; a projection unit that has a zoom mechanism unit capable of changing a zoom magnification of a projection image, executes focusing based on the distance measured by the distance measuring unit and projects an image on the screen; and an elevation angle control unit that controls an elevation angle of the distance measuring unit based on the zoom magnification set by the zoom mechanism unit in such a way that a distance measuring center line of the distance measuring unit corresponds to a center point of a projection area of the projection image, wherein the center point of a projection area is determined according to the zoom magnification of the zoom mechanism unit.

REFERENCES:
patent: 2003/0223049 (2003-12-01), Ohara
patent: 2005-006228 (2005-01-01), None

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