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US 8,128,238 B2Granted
Projection optical system and image displaying apparatus
AssigneeRicoh Company, Ltd.
InventorsKazuhiro Fujita, Atsushi Takaura, Issei Abe
Life of this patent
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Abstract
Disclosed is a projection optical system including a projection surface configured such that an image conjugate to an object is projected, plural optical elements having a refractive power, and a deflecting element having no refractive power configured to deflect an optical path of a light beam and to pass the light beam having a deflected optical path between the plural optical elements, wherein a normal line of the projection surface at a center of the projection surface does not pass through the plural optical elements or between the plural optical elements.
Claims6
A projection optical system comprising:
- a projection surface configured such that an image conjugate to an object is projected;
- plural optical elements having a refractive power;
- and
- a deflecting element having no refractive power configured to deflect an optical path of a light beam and to pass the light beam having a deflected optical path between the plural optical elements;
- and
- wherein a normal line of the projection surface at a center of the projection surface does not pass through the plural optical elements or between the plural optical elements;
- wherein the plural optical elements comprise a first optical system having a positive refractive power and configured to form an intermediate image conjugate to the object and a second optical system comprising at least one optical element and configured to form an image conjugate to the intermediate image;
- wherein the deflecting element is provided in an optical path between the second optical system and the projection surface;
- wherein a light beam from the deflecting element to the projection surface traverses a light beam from the first optical system to the second optical system;
- and
- wherein the deflecting element is a detachable element.
8 more elements
A projection optical system comprising:
- a projection surface configured such that an image conjugate to an object is projected;
- plural optical elements having a refractive power;
- and
- a deflecting element having no refractive power configured to deflect an optical path of a light beam and to pass the light beam having a deflected optical path between the plural optical elements;
- and
- wherein a normal line of the projection surface at a center of the projection surface does not pass through the plural optical elements or between the plural optical elements;
- wherein the plural optical elements comprise a first optical system having a positive refractive, power and configured to form an intermediate image conjugate to the object and a second optical system comprising at least one optical element and configured to form an image conjugate to the intermediate image;
- wherein the deflecting element is provided in an optical path between the second optical system and the projection surface;
- wherein a light beam from the deflecting element to the projection surface traverses a light beam from the first optical system to the second optical system;
- and
- wherein the deflecting element is a reflectance controllable element.
8 more elements
A projection optical system comprising:
- a projection surface configured such that an image conjugate to an object is projected;
- plural optical elements having a refractive power;
- and
- a deflecting element having no refractive power configured to deflect an optical path of a light beam and to pass the light beam having a deflected optical path between the plural optical elements;
- and
- wherein a normal line of the projection surface at a center of the projection surface does not pass through the plural optical elements or between the plural optical elements;
- wherein the plural optical elements comprise a first optical system having a positive refractive power and configured to form an intermediate image conjugate to the object and a second optical system comprising at least one optical element and configured to form an image conjugate to the intermediate image;
- wherein the deflecting element is provided in an optical path between the second optical system and the projection surface;
- wherein a light beam from the deflecting element to the projection surface traverses a light beam from the first optical system to the second optical system;
- and
- wherein the deflecting element is a half mirror element.
8 more elements
Dependencies are inferred from the claim text.