Abstract: A compact optical imaging lens can include a front lens group, a rear lens group, and a reflective element to redirect light passing through the system. The reflective element can be placed in front of the front lens group or between the front and rear lens group. In some cases, multiple reflective elements can be used. The use of reflective elements can reduce the depth of the imaging system, allowing for more compact designs.

Abstract: A method of manufacturing a compact optical lens module includes providing a housing unit including a lens group, providing a substrate including an image sensor, and inserting a fitting member between the housing unit and the substrate to adjust a focal length of the compact optical lens assembly.

Abstract: A compact optical imaging lens can include a front lens group, a rear lens group, and a reflective element to redirect light passing through the system. The reflective element can be placed in front of the front lens group or between the front and rear lens group. In some cases, multiple reflective elements can be used. The use of reflective elements can reduce the depth of the imaging system, allowing for more compact designs.

Abstract: An optical assembly for a projection illumination system has a refractive lenses and a diffractive lens for imaging a sheet of light from a light source onto a Spatial Light Modulator (SLM). One embodiment utilizes a fresnel lens having kinoforms formed on a surface. Such a lens may be molded using a light-weight plastic in a single step.

Abstract: A multi-array spatial light modulating (SLM) device and methods of fabricating such a device. The multi-array SLM device includes a number of addressable arrays of elements, and each of the addressable arrays is capable of modulating light to generate an image.

Abstract: An apparatus for generating a number of color light components. Each of the color components propagates along an optical path, and these optical paths are of substantially equal optical length.

Abstract: An apparatus of generating a number of color light components. Each of the color components propagates along an optical path, and these optical paths are of substantially equal optical length. The apparatus may generate the color components using non-polarized light.

Abstract: An apparatus for combining a number of received images into a single image. Each of a number of received images propagates along an optical path of substantially equal optical length.

Abstract: An apparatus for combining a number of received images into a single image. Each of the number of received images propagates along an optical path of substantially equal optical length. The number of received images may each comprise non-polarized light.

Abstract: A novel projection system includes an illumination source for emitting an illumination beam, a reflective display device for modulating the illumination beam to form a reflected imaging beam, a projection lens group having an optical axis, and a field lens group. The field lens group is de-centered with respect to the optical axis of the projection lens group and is disposed to redirect the illumination beam to illuminate the display device at a non-zero angle of incidence, and to redirect the reflected imaging beam along an optical path parallel to the optical path of the projection lens group. In a particular embodiment the display device is disposed on the optical axis of the projection lens group. In a more particular embodiment, the redirected portion of the optical path of the reflected imaging beam is coincident with the optical axis of the projection lens group.

Abstract: A multi-array spatial light modulating (SLM) device and methods of fabricating such a device. The multi-array SLM device includes a number of addressable arrays of elements, and each of the addressable arrays is capable of modulating light to generate an image.

Abstract: An optics engine having a multi-array spatial light modulating device. The multi-array spatial light modulating device includes a number of addressable arrays of elements, each of the addressable arrays capable of modulating light to generate an image. The images created by the number of addressable arrays may then be combined into a single image.

Abstract: A novel projection system includes an illumination source for emitting an illumination beam, a reflective display device for modulating the illumination beam to form a reflected imaging beam, a projection lens group having an optical axis, and a field lens group. The field lens group is de-centered with respect to the optical axis of the projection lens group and is disposed to redirect the illumination beam to illuminate the display device at a non-zero angle of incidence, and to redirect the reflected imaging beam along an optical path parallel to the optical path of the projection lens group. In a particular embodiment the display device is disposed on the optical axis of the projection lens group. In a more particular embodiment, the redirected portion of the optical path of the reflected imaging beam is coincident with the optical axis of the projection lens group.

Abstract: The invention resides in a method of measuring position and angle comprising the steps of providing a tooling telescope, a transparent target surface and an alignment target having a light reflecting face confronting the telescope. The light reflecting face being defined by a recess having a parabolic surface and a flat surface surrounding the parabolic recess. The method further includes using light reflected off the flat surface to create collimated light passing through the target surface to define an angle of measurement of the tooling telescope and using light reflected off the parabolic surface to focus a point on the transparent target surface to measure position.

Abstract: An improved null optical testing arrangement (22) for null testing aspheric surfaces of optics includes a reflective/diffractive null optical component (24). The reflective/diffractive null optical component (24) provides a reflective/diffractive surface (30) that is easily qualified as a null testing optical arrangement. The reflective/diffractive surface (30) of the null optic (24) generates a reference wavefront which can be completely characterized by measuring the diameters of diffractive rings with an interferometer (42).

Abstract: An optic mode switching system 14 provides for switching between two or more optic modes by movement of an eye 24. The system 14 comprises a first optic system 10 which provides a first image at a first position 25. The system 14 also comprises a second optic system 12 which provides a second image at a second position 40. The viewer switches optic modes by moving eye 24 from the first position 25 in the eyepiece to the second position 40 during viewing.

Abstract: An improved jack for a ground vehicle including a lever operated jacking mechanism substantially encompassing an elongated rack means, a tubular member affixed at one of its ends to said jacking mechanism and telescopically receiving one end of said rack means therein, ground engaging means pivotally secured to the opposite end of the rack means and bracket means including a channel portion receiving therein the end of said tubular member opposite the jacking mechanism. The improvement comprises means for securing the jack in a generally horizontal storage position comprising an elongated rigid rod, means disposed on the jack at a location spaced apart from the bracket means and defining a first opening for receiving one end of the securing rod and non-pivotal means associated with the bracket means and defining a second opening for receiving the opposite end of the securing rod.