Abstract: An image projector includes a spatial light modulator (SLM) with a two dimensional array of pixel elements controllable to modulate a property of light transmitted or reflected by the pixel elements. An illumination arrangement delivers illumination to the SLM. A collimating arrangement collimates illumination from the SLM to generate a collimated image directed to an exit stop. The illumination arrangement is configured to sequentially illuminate regions of the SLM, each corresponding to a multiple pixel elements. A controller synchronously controls the pixel elements and the illumination arrangement so as to project a collimated image with pixel intensities corresponding to a digital image.

Abstract: An image projector includes a spatial light modulator (SLM) with a two dimensional array of pixel elements controllable to modulate a property of light transmitted or reflected by the pixel elements. An illumination arrangement delivers illumination to the SLM. A collimating arrangement collimates illumination from the SLM to generate a collimated image directed to an exit stop. The illumination arrangement is configured to sequentially illuminate regions of the SLM, each corresponding to a multiple pixel elements. A controller synchronously controls the pixel elements and the illumination arrangement so as to project a collimated image with pixel intensities corresponding to a digital image.

Abstract: A unit magnification microscope includes a first lens assembly (20) with a number of lenses forming an infinity-corrected objective and a second lens assembly (22), identical to the first lens assembly, deployed in an opposite orientation along a light path. A physical stop (26) is located at a central point along the light path between the lens assemblies. A focal plane array image sensor (28) is mounted at the external focal plane of the second lens assembly, such that light from an object at an object plane (30) is focused with unit magnification on the focal plane array image sensor after passing along the light path through the first lens assembly, the physical stop and the second lens assembly. A beam splitter (34) may be used to introduce illumination along the light path.

Abstract: A unit magnification microscope includes a first lens assembly (20) with a number of lenses forming an infinity-corrected objective and a second lens assembly (22), identical to the first lens assembly, deployed in an opposite orientation along a light path. A physical stop (26) is located at a central point along the light path between the lens assemblies. A focal plane array image sensor (28) is mounted at the external focal plane of the second lens assembly, such that light from an object at an object plane (30) is focused with unit magnification on the focal plane array image sensor after passing along the light path through the first lens assembly, the physical stop and the second lens assembly. A beam splitter (34) may be used to introduce illumination along the light path.

Abstract: An image projector includes a spatial light modulator (SLM) with a two dimensional array of pixel elements controllable to modulate a property of light transmitted or reflected by the pixel elements. An illumination arrangement delivers illumination to the SLM. A collimating arrangement collimates illumination from the SLM to generate a collimated image directed to an exit stop. The illumination arrangement is configured to sequentially illuminate regions of the SLM, each corresponding to a multiple pixel elements. A controller synchronously controls the pixel elements and the illumination arrangement so as to project a collimated image with pixel intensities corresponding to a digital image.

Abstract: Apparatus is provided including an extraocular device, which includes an eyeglasses frame, which is placed in front of an eye of a subject, and a power source coupled to the eyeglasses frame and configured to emit a beam of light that is outside of 380-750 nm. A light-guiding element is coupled to the eyeglasses frame and at least one optical coupling-in element and at least one optical coupling-out element are optically coupled to the light-guiding element. The coupling-in element is positioned such that the beam of light is directed into the light-guiding element via the coupling-in element, and the coupling-in and coupling-out elements are positioned such that the beam diverges from a focal point located within 3 mm of the coupling-out element. Other applications are also described.

Abstract: A Cassegrain optical system has a concave primary mirror deployed for receiving incident electromagnetic radiation and generating once-reflected rays, a convex secondary mirror deployed for receiving the once-reflected rays and generating twice-reflected rays, a tertiary reflector deployed for receiving the twice-reflected rays and generating thrice-reflected rays, and a beam-folding optical element deployed between the primary mirror and the secondary mirror for deflecting the thrice-reflected rays laterally so as to exit a volume between the primary and secondary mirrors.

Abstract: Apparatus is provided including an extraocular device, which includes an eyeglasses frame, which is placed in front of an eye of a subject, and a power source coupled to the eyeglasses frame and configured to emit a beam of light that is outside of 380-750 nm. A light-guiding element is coupled to the eyeglasses frame and at least one optical coupling-in element and at least one optical coupling-out element are optically coupled to the light-guiding element. The coupling-in element is positioned such that the beam of light is directed into the light-guiding element via the coupling-in element, and the coupling-in and coupling-out elements are positioned such that the beam diverges from a focal point located within 3 mm of the coupling-out element. Other applications are also described.

Abstract: A mirrorless scanner including a source of laser light producing a laser beam, a lens operative to receive the laser beam from the source of laser light and to direct it onto a target, and a vibrator coupled to the lens for vibrating the lens in at least two dimensions for causing the laser beam to scan across the target.