Abstract: An imaging system comprises a light field camera (3) for recording a hyperspectral light field (CLF). The system also comprises a light projector (4) for projecting a light field in visible light (PLF). The camera and the projector share a common optical axis. The projector projects a light field (PLF) based on the hyperspectral light field (CLF) captured by the light field camera.

Abstract: The invention relates to a horseshoe magnet (110) that can cost -effectively be manufactured. In one embodiment, the magnet (110) comprises a yoke (120) and at least one pole tip (130) that is attached to an arm (122) of the yoke (120) but that is not integral with said arm. Optionally, the yoke (120) and the pole tip (130) are made from different materials, particularly from iron and cobalt-iron, respectively.

Abstract: An imaging system comprises a light field camera (3) for recording a hyperspectral light field (CLF). The system also comprises a light projector (4) for projecting a light field in visible light (PLF). The camera and the projector share a common optical axis. The projector projects a light field (PLF) based on the hyperspectral light field (CLF) captured by the light field camera.

Abstract: There is provided an arrangement for light balancing. The arrangement provides light balancing and robust flux feedback and comprises a light source array, a plurality of light sources arranged as a plurality of strings of individual light emitting diodes, at least one light guide structure, and at least one optical sensor. The arrangement provides feedback relating to the optical contribution for each one of the plurality of strings of individual light emitting diodes and is thereby maintaining the emitted light at a balanced level.

Abstract: Disclosed are systems and methods for providing multi-channel illumination. A reflector and at least four solid state light sources are operable to emit light. A plurality of combinations of the solid state light sources are identified, where each of the combinations is operable to emit light that matches a target color point. The combinations are ranked based on their respective luminous flux value, and at least one of the combinations is selected based on the rank. A duty cycle of a control signal of each light source of the selected combinations is determined to control light emitted from the reflector.

Abstract: A lighting device (1) comprising a housing (5) with holding means (7) for fixation of an adjustable reflector (3) inside the housing and comprising a light emission window (9) opposite the reflector. The reflector is provided with fixation means (19) having a fitting structure (21) with respect to the holding means and enabling adjustment of the reflector within the housing. The adjustment comprises a change in shape of the reflector and/or a change in the mutual position of the reflector and a contacting element (15).

Abstract: A lighting device is provided for projecting a pixelated lighting pattern to be viewed onto a surface facing said device is provided. The device comprises a plurality of independently controllable lighting units (1), each lighting unit comprising at least one light-emitting diode (3, 4, 5, 6), and a controller (7) for controlling the emission of light from said lighting units. A device according to the present invention allows ambient illumination of a surface and projection of images and patterns.

Abstract: An illumination system has a plurality (2) of light-collimating sections (12, 12?, 12?) and a light-mixing section (3). The light-collimating sections are arranged substantially parallel to each other along a longitudinal axis (25) of the illumination system. Each of the light-collimating sections is associated with at least one light emitter (R, G, B). Each of the light emitters is being in optical contact with the respective light-collimating section via a dielectric material with a refractive index larger than or equal to 1.3. At a side facing away from the light emitters, the light-collimating sections merge into the light-mixing, the light-collimating sections and the light-mixing section forming one integral part. Light propagation in the light-mixing section is based on total internal reflection and the light-mixing section has a plurality of faces parallel to the longitudinal axis.

Abstract: The invention relates to a compact incandescent lamp with an integrated reflector, comprising at least a lamp bulb, on one part of the surface of which the reflector is applied as a reflective layer and another part thereof is a light output window, an incandescent element, which is arranged in a defined way in the lamp bulb and is positioned in a defined way with respect to the reflective layer, wherein at least the part of the lamp bulb which carries the reflective layer is non-axisymmetric and/or a part of the light output window is asymmetrically shaped, so that the visible light which the lamp can generate illuminates a region of space non-axisymmetrically.

Abstract: A lighting device is provided for projecting a pixelated lighting pattern to be viewed onto a surface facing said device is provided. The device comprises a plurality of independently controllable lighting units (1), each lighting unit comprising at least one light-emitting diode (3, 4, 5, 6), and a controller (7) for controlling the emission of light from said lighting units. A device according to the present invention allows ambient illumination of a surface and projection of images and patterns.

Abstract: An optical scanning device for scanning first and second type of record carriers includes a radiation-generating device for generating a radiation beam having first and second wavelengths in the different modes. An objective system focuses the radiation beam on the record carrier. An optical element is provided having a structure in the radiation beam for introducing vergence and aberration in the radiation beam of the second wavelength. The aberration may be written as a polynomial with at least two terms a2?2 and a4?4. If a2=0 and a4=0, the corresponding values of a4 and a2 are given by a40 and a20, respectively. a2, a4, a20 and a40 satisfy the relation 0.9<((a2/a20)+(a4/a40))<1.1, as well as either the relation 0.20<(a2/a20)<0.90 (if a40) or the relation 1.05<(a2/a20)<2.00 (if a4<0).

Abstract: An optical scanning device for scanning of a first, second and third type of optical record carrier with radiation of a first wavelength ?1, a second wavelength ?2 and a third wavelength ?3, respectively, where the three wavelengths are substantially different. The device comprises: a radiation source for emitting a beam of said radiation, an objective system for converging the beam on a selected one of the optical record carriers, and a phase structure arranged in the path of the beam, the phase structure comprising a plurality of phase elements of different heights, forming a non-periodic stepped profile of optical paths in the beam, and is characterised in that the stepped profile substantially approximates a flat wavefront at the first wavelength ?1, a spherical aberration wavefront at the second wavelength ?2, and a flat or spherical aberration wavefront at the third wavelength ?3.

Abstract: An optical head (1) for scanning an optical record carrier (2) is provided with a compensator (16) for compensating the field curvature aberration of the objective system (18) caused by operation of the optical head at a different field angles. A surface of the compensator (16) comprises a phase structure in the form of annular areas (52, 53, 54, 55, 56), the areas forming a non-periodic pattern of optical paths of different lengths. The optical paths change as a function of field angle and form a field angle-dependent wavefront deviation that compensates field curvature of the optical head.

Abstract: An optical scanning device for scanning a dual-layer optical record carrier. The device includes a spherical aberration compensation optical subsystem having a switchable liquid crystal cell (10) for altering a wavefront deviation generated in a folding mirror (32) including a non-periodic phase structure (NPS) located behind a polarization-selective reflective layer.

Abstract: An optical head (1) for scanning optical record carriers (2) is provided with a compensator (16) for compensating spherical aberration of the objective system (18) or defocus of the collimator lens (14) caused by operation of the optical head at a temperature different from the design temperature. A surface of the compensator (16) comprises a phase structure in the form of annular areas (52, 53, 54), the areas forming a non-periodic pattern of optical paths of different length. The optical paths change as a function of temperature and form a temperature-dependent wavefront deviation that compensates the spherical aberration and/or defocus.

Abstract: A device for scanning a first and second type of optical record carriers (2; 40) generates a first and a second radiation beam for scanning the first and second type of record carriers, respectively, the first radiation beam having a first numerical aperture larger than the second numerical aperture of the second radiation beam. The device includes a non-periodic phase structure that does not affect the first radiation beam. The phase structure introduces an amount of spherical aberration in the second radiation beam for scanning the second type of record carriers for compensating the difference in spherical aberration required for scanning through the different thickness of the transparent layer (3; 41) of the first and second type of record carriers (2, 40).

Abstract: An optical scanning device for scanning a dual-layer optical record carrier with dual orthogonally polarized radiation beams. The device having a spherical aberration compensation optical subsystem including a switchable liquid crystal cell of birefringent material for altering different optical paths lengths provided by a phase structure of stepped annular zones.

Abstract: An optical element (16) introduces a first wavefront deviation when a first radiation beam having a first wavelength passes through it and a second wavefront deviation when a second radiation beam having a second wavelength different from the first wavelength passes through it. One surface of the optical element comprises a phase structure in the form of annular areas (52, 53, 54, 55), the areas forming a non-periodic pattern of optical paths of different length. The optical paths for the first wavelength form the first wavefront deviation and the optical paths for the second wavelength form the second wavefront deviation, the difference between the two deviations being proportional to the difference between the first and second wavelength.

Abstract: A device for scanning a first and second type of optical record carriers (2, 40) generators a first and a second radiation beam for scanning the first and second type of record carriers, respectively. The information layers (4, 42) of the first and second type of record carriers is scanned through transparent layers (3, 41) of different thickness. The first radiation beam (17) has a first wavelength and a first numerical aperture NA?1. The second radiation beam (46) has a different, second wavelength and an effective second numerical aperture NA2 smaller NA1. The rays of the second radiation beam having an NA smaller than NA2 form a central sub-beam (48), the rays having a larger NA form an outer sub-beam (49). The device includes a non-periodic phase structure that does not affect the first radiation beam. The phase structure introduces an amount of spherical aberration in the central sub-beam (48). The phase structure is transparent for the central and outer sub-beam (48, 49).

Abstract: An optical scanning device for scanning a dual-layer optical record carrier. The device comprises a spherical aberration compensation optical subsystem including a switchable liquid crystal cell (10) for altering a wavefront deviation generated in a folding mirror (32) including non-periodic phase structure (NPS) located behind a polarisation-selective reflective layer.