Wide angle lens assembly for projector and an optical system having such a lens and projector
AssigneeLearning Technologies, Inc.
InventorsPhilip Sadler, Mary-Patricia Adamo, James Kumler
Life of this patent
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Abstract
Featured is a projection lens assembly including a plurality or more of optical elements, whose optical elements are configured and arranged so the configuration and arrangement substantially maintains the shape of the images being displayed throughout a hemispherical screen. That is, the optical elements are configured and arranged so to introduce a predetermined amount of distortion that substantially maintains the shape of the images being displayed on the screen from the zenith to near the edge of the field of view. Also featured are projection apparatuses and systems embodying such a projection lens assembly.
Claims19
A projection lens for use in projecting images onto a hemispherical screen, said projection lens comprising:
- a plurality of optical elements;
- wherein the optical elements are configured and are arranged so that such configuration and arrangement corrects for distortion of the shape of an image being displayed on the screen between the zenith and at near the edge of the field of view.
A projection apparatus for projecting images onto a hemispherical screen, said projection apparatus comprising:
- a projector having a light output;
- a lens assembly optically coupled to the projector's light output;
- wherein the lens assembly includes a plurality of optical elements;
- and
- wherein the optical elements are configured and are arranged so that such configuration and arrangement corrects for distortion of the shape of an image being displayed on the screen between the zenith and at near the edge of the field of view.
A projection system, comprising:
- a projector having a light input;
- a hemispherical screen;
- a lens assembly optically coupled to the projector's light output;
- wherein the lens assembly includes a plurality of optical elements;
- and
- wherein the optical elements are configured and are arranged so that such configuration and arrangement corrects for distortion of the shape of an image being displayed on the hemispherical screen between the zenith and at near the edge of the field of view.
A planetarium projection system, comprising:
- a projector having a light output;
- a hemispherical screen;
- a lens assembly optically coupled to the projector's light output;
- wherein the lens assembly includes a plurality of optical elements;
- and
- wherein the optical elements are configured and are arranged so that such configuration and arrangement corrects for distortion of the shape of an image being displayed on the hemispherical screen between the zenith and at near the edge of the field of view.
Dependencies are inferred from the claim text.