An example optical system for a 3D stereoscopic image display comprises a changing mirror, a rotating mirror, a tilted mirror, a concave mirror and a planar mirror. The changing mirror can change the path of light from a horizontal direction to a vertical direction. The rotating mirror can rotate while having an X-axis and a Y-axis with different curvature radii. The tilted mirror can include a central region with a hole for allowing light to pass therethrough, and a peripheral region having one surface having a concave tilted structure while the other surface has a planar structure. The concave mirror can include a central region with a hole having a size capable of encompassing the tilted mirror and a peripheral region having a bent structure that is completely concave. The planar mirror can include a central region with a hole and a peripheral region with a flat doughnut structure.

An optical system such as an imaging system, projecting system or combined imaging and projecting system, has complex dielectric coatings and/or reflecting polarizers to separate multiple spectral bands and/or polarizations on one or more of the system's curved mirrors.

An optical system for a three-dimensional stereoscopic image display, according to exemplary embodiments, can comprise a changing mirror, a rotating mirror, a tilted mirror, a concave mirror and a planar mirror. The changing mirror can be provided so as to change the path of light, having passed through a spatial light modulator, from a horizontal direction to a vertical direction. The rotating mirror can be provided to rotate while having an X-axis and a Y-axis with respectively different curvature radii. The tilted mirror can be provided such that a central region thereof has a hole for allowing light to pass therethrough, and a peripheral region thereof has one surface having a concave tilted structure while the other surface has a planar structure. The concave mirror can be provided such that a central region thereof has a hole having a size capable of encompassing the tilted mirror and a peripheral region thereof has a bent structure that is completely concave. The planar mirror can be provided such that a central region thereof has a hole formed therein and a peripheral region thereof has a flat doughnut structure.

An optical system such as an imaging system, projecting system or combined imaging and projecting system, has complex dielectric coatings and/or reflecting polarizers to separate multiple spectral bands and/or polarizations on one or more of the system's curved mirrors.

A compact, on-axis telephoto lens camera includes an arrangement of mirrors which receives incident light, and compresses and redirects the light, the arrangement having a primary mirror which receives the incident light, compresses and redirects the light toward a focal point of the primary mirror and has an opening defined at a central portion thereof, and a secondary mirror which receives light from the primary mirror and further redirects same. The camera also includes a cavity which extends into the camera from the opening of the primary mirror, aspheric lenses disposed at least partially within the cavity which receive the light from the multiple-mirror arrangement, and progressively expand and redirect the light received from the mirror arrangement, and an image sensor which receives the light from the aspheric lenses. The image sensor is disposed closely adjacent to the cavity such that a back focal length is substantially zero.

An optical system that images a scene at two different fields of view, with switching between fields of view enabled by switchable mirrored surface is disclosed. A voltage change across the switchable mirror element generates a change in the reflection and transmission properties of the element, such that the element switches between a mirror state and a lens state. When nested in an annular reflective optic system of a given field of view, the switching element enables the opening of an additional optical path through the center of the reflective optics where a set of refractive optics are assembled into an imaging system for a second field of view. This dual field-of-view system changes field of view with no mechanical movement.

An optical system that images a scene at two different fields of view, with switching between fields of view enabled by switchable mirrored surface is disclosed. A voltage change across the switchable mirror element generates a change in the reflection and transmission properties of the element, such that the element switches between a mirror state and a lens state. When nested in an annular reflective optic system of a given field of view, the switching element enables the opening of an additional optical path through the center of the reflective optics where a set of refractive optics are assembled into an imaging system for a second field of view. This dual field-of-view system changes field of view with no mechanical movement.

An optical system that images a scene at two different fields of view, with switching between fields of view enabled by switchable mirrored surface is disclosed. A voltage change across the switchable mirror element generates a change in the reflection and transmission properties of the element, such that the element switches between a mirror state and a lens state. When nested in an annular reflective optic system of a given field of view, the switching element enables the opening of an additional optical path through the center of the reflective optics where a set of refractive optics are assembled into an imaging system for a second field of view. This dual field-of-view system changes field of view with no mechanical movement.

An optical system that images a scene at two different fields of view, with switching between fields of view enabled by switchable mirrored surface is disclosed. The two fields of view vary in focal length by a factor of three. Both the wide field of view configuration and the narrow field of view configuration image broad-band short wave infrared radiation at an effective f/number of 1.4. A voltage change across the switchable mirror element generates a change in the reflection and transmission properties of the element, such that the element switches between a mirror state and a lens state. When nested in an annular reflective optic system of a given field of view, the switching element enables the opening of an additional optical path through the center of the reflective optics where a set of refractive optics are assembled into an imaging system for a second field of view. This dual field-of-view system changes field of view with no mechanical movement.

Disclosed are a wide-angle optical system and an optical device. The first lens includes a first mirror surface and a second mirror surface, the first mirror surface is a convex surface, and the second mirror surface is a concave surface; the second lens includes a third mirror surface and a fourth mirror surface, and both the third mirror surface and the fourth mirror surface are convex surfaces; the third lens includes a fifth mirror surface and a sixth mirror surface, and both the fifth mirror surface and the sixth mirror surface are convex surfaces; the fourth lens includes a seventh mirror surface and an eighth mirror surface, the seventh mirror surface is a concave surface, and the eighth mirror surface is a convex surface.