Abstract:
The technology provides a waveguide display having a compact projection light engine and a diffractive waveguide. The diffractive waveguide includes input diffraction gratings with rolled k-vectors. The projection light engine provides collimating light to a projected exit pupil external to the diffractive waveguide. The projection light engine components may include a light (or illuminating) source, microdisplay, lenticular screen, doublet, polarizing beam splitter (PBS), clean-up polarizer, fold mirror, curved reflector and quarter waveplate. A method of manufacturing a diffractive waveguide includes providing input gratings with rolled k-vectors. Rays of light are diffracted by, and passed through, a master hologram to form input diffraction gratings of a copy substrate. A second copy substrate may likewise be formed with a different master hologram. Multiple copy substrates may be assembled to form a multi-layer diffractive waveguide (or multiple diffractive waveguides) having input diffraction gratings with increased diffraction efficiency and angular bandwidth.
Abstract:
The invention relates to a method and to a device for producing a hologram (15) as a security feature, a hologram (15) and a security document provided with said type of hologram (15). The claimed hologram (15) is preferably individualised and consists of partial holograms that are arranged next to each other and produced with various spectral colours.
Abstract:
A transfer recording material (10) allowing the production of customized holographic images is described. The transfer recording material comprises a multilayer structure on a carrier forming a plurality of panels (20, 22). A portion of the multilayer structure corresponding to a panel (20) comprises an embossable layer (holographic layer) wherein each pixel (1,2,...,n) is configured to reflect incoming light at a predetermined angle alphal. Each pixel (1'2',...m') corresponding to the embossable layer of an adjacent panel is configured to reflect incoming light at a different predetermined angle alpha2. The transfer recording material can have as many panels as desired by a particular application, each of the layers having an embossable layer with pixels configured to reflect incoming light at a certain angle alphan.The transfer material is therefore formed by a plurality of spaced-apart panels each of which comprises an embossable holographic layer reflecting light at a predetermined angle different from that of other panels. Upon activation of a surface of a printer head, pixels from different panels transfer onto a substrate, forming a desired customized holographic design.
Abstract:
Apparatus and method for producing a plurality of holographic diffraction gratings wherein two or more interfering beams (24) are generated by means of an apertured mask (20). The mask is formed with one or more aperture (22) and is located in the path of the light source (12) and acts to baffle or block the light such that the light passes through only in the region of the apertures thereby creating the number and angle of beams required.
Abstract:
An instrument panel (10) for a motor vehicle is provided. The instrument panel includes an instrument panel surface (24) and a plurality of indicia (26) disposed on the instrument panel surface. The plurality of indicia comprises holographic ink.
Abstract:
끊김없는 컬러 홀로그래픽 영상 재생을 위한 홀로그래픽 파면 기록 장치 및 방법이 제공된다. 본 발명의 실시예에 따른 컬러 홀로그래픽 파면 프린터는, 공간 광 변조기에 홀로그래픽 프린지 패턴의 일부를 표시하고 이에 입사된 평면파에 의해 회절된 파면을 생성하는 광 변조부 및 광 변조부에서 출사되는 회절된 파면에서 일부를 분리하여 홀로그래픽 기록 매질에 전달하는 광 필터부를 포함하고, 요소 홀로그램은 각기 다른 컬러 부분들로 구분되어 있고, 광 변조부에는 한 시점에 한 가지 컬러 부분들만 표시된다. 이에 의해, 하나의 요소 홀로그램을 세분화하여 세분화된 간섭 패턴이 각 레이저 광원에 의해 회절되어 홀로그래픽 기록 매질에 컬러 홀로그램을 기록할 수 있게 되며, 세분화 정도에 따라 보다 자연스럽고 선명한 컬러 홀로그래픽 기록이 가능해진다.
Abstract:
Die Erfindung betrifft eine Vorrichtung und ein Verfahren zur Erzeugung einer Markierung auf einem Substrat. Derart markierte Substrate werden auf Dokumente wie z.B. Kreditkarten, Personalausweisen oder Geldscheinen als Sicherheitsmerkmale zum Schutz gegen Fälschung aufgebracht. Ausführungen dieser Sicherheitsmerkmale weisen diffraktive oder holographische Strukturen auf. Die Erzeugung der Markierungen wird bisher durch Abformung von einer Matrize durchgeführt. Eine Änderung der Markierung ist durch zeitaufwendiges Wechseln der Matrize möglich. Die neue Vorrichtung und das neue Verfahren sollen die Herstellung von individualisierten Markierungen auf einem Substrat mit geringem apparativen Aufwand erlauben. Eine Ausführung der erfindungsgemäßen Vorrichtung zur Erzeugung einer Markierung (45) auf einem Substrat (43), vorzugsweise einer Folie, weist eine Repliziervorrichtung (41) und eine Laseranlage (30) auf, die mit der Repliziervorrichtung(41) zusammenwirkt, indem Strahlung der Laseranlage (30) zur Ausbildung von mindestens einem Abformbereich auf mindestens einen Bestrahlungsbereich (44) der Repliziervorrichtung (41) gerichtet ist. Weiterhin weist die Vorrichtung eine Gegendruckvorrichtung (42) auf, wobei ein Substrat (43) zwischen Repliziervorrichtung (41) und Gegendruckvorrichtung (42) angeordnet ist, um in einem Kontaktbereich zwischen der Repliziervorrichtung (41) und dem Substrat (43) den Abformbereich auf das Substrat (43) abzuformen und wobei die Zuführung der Strahlung zur Ausbildung der Abformbereiche außerhalb des Substrats (43) verläuft .
Abstract:
A digital print system for generating and printing selectably shaped shaped optical security devices onto the surface of a substrate, wherein the selected shapes may incorporate pre-pinted pattern. The system includes a digital print engine for generating selectable shapes, a foil assembly that includes a supply of thermal foil optionally carrying a pre-printed optical security pattern, a pressure mechanism for applying pressure between the digital print engine and a surface of the substrate, and an advancing mechanism for co-operatively advancing a substrate, either simultaneously with or independently from the foil, each of which may be operatively controlled by a micro-processor.
Abstract:
Die Erfindung betrifft ein Verfahren zum Herstellen eines Volumenhologramms mit zumindest einem ersten Bereich in einer ersten Farbe und zumindest einem zweiten Bereich in einer zweiten Farbe, mit den Schritten: a) Bereitstellen einer Volumenhologrammschicht aus einem Photopolymer; b) Anordnen eines Masters mit einer Oberflächenstruktur an der Volumenhologrammschicht; c) Belichten des Masters mittels kohärentem Licht, wobei Licht welches auf zumindest einen ersten Teilbereich der Oberfläche des Masters einfällt, in Richtung des zumindest einen ersten Bereichs der Volumenhologrammschicht gebeugt oder reflektiert wird und Licht, welches auf zumindest einen zweiten Teilbereich der Oberfläche des Masters einfällt, in Richtung des zumindest einen zweiten Bereichs des Volumenhologramms gebeugt oder reflektiert wird, und wobei sich das vom ersten und zweiten Teilbereich gebeugte oder reflektierte Licht in zumindest einer optischen Eigenschaft unterscheidet.
Abstract:
A direct-write lithography apparatus includes a polarization selector stage configured to vary a polarization orientation angle of light from a light source, a focusing element configured to focus the light from the light source into a spot at a focal plane thereof, and a scanning stage configured to scan the spot in at least two dimensions along a surface of a polarization-sensitive recording medium that is arranged proximate to the focal plane such that neighboring scans substantially overlap. The polarization selector stage and the scanning stage are configured to be operated independently of one another. Related fabrication methods of and optical elements fabricated thereby are also discussed.