Security Devices Incorporating Optically Variable Adhesive
Granted: September 6, 2007
Application Number:
20070206249
A structure for providing an optical effect comprises a first and second substrates hot stamped together by an adhesive. The adhesive comprises an energy activated binder having a plurality of particles distributed therein or thereon for providing the optical effect detectable through the first substrate.
Security Device Formed By Printing With Special Effect Inks
Granted: August 30, 2007
Application Number:
20070200002
A security device is disclosed that has an image formed upon a substrate. The image has a first printed region and a second different printed region both printed with a same ink formulation of field alignable flakes. At least one of the printed regions has optically variable effects. One of the first and second printed regions at least partially surrounds the other. The second printed region is formed of thin parallel lines and the first printed region has substantially wider lines than…
ASYMMETRIC DIRECTIONAL COUPLER HAVING A REDUCED DRIVE VOLTAGE
Granted: August 30, 2007
Application Number:
20070201784
The invention relates to an electro-optic directional coupler suitable for use as a variable optical attenuator at reduced voltages compared to those known in the prior art. The present invention has found that by careful selection of an asymmetric directional coupler geometry, the transfer function of the device can be shifted so that it has an operating point between maximum and minimum transmission. Signal electrodes driven in push pull configuration advantageously use this operating…
LC imager panel assembly
Granted: August 23, 2007
Application Number:
20070195257
The invention provides an imager panel subassembly for use in an optical projection system. The subassembly includes a reflective imager panel, such an LCoS microdisplay, for spatially modulating an optical beam incident upon a front surface thereof for producing an image. An optically transparent birefringent trim retarder is disposed in front of the front surface of the imager panel for enhancing the image contrast, and for protecting the imager panel from the outside dust. The…
Thin-Film Optical Retarders
Granted: August 23, 2007
Application Number:
20070195272
An oblique angle deposition is used to provide an A-plate optical retarder having at least one dense, form-birefringent layer. According to one embodiment, the dense, form-birefringent layer(s) are deposited as part of an FBAR stack to provide an all-dielectric full-function A/?C-plate trim retarder for LCD birefringence compensation. Advantageously, the dense structure of the full-function A/?C-plate trim retarder offers high durability and/or stability, thus making it well suited for…
Adhesive Chromagram And Method Of Forming Thereof
Granted: August 23, 2007
Application Number:
20070195392
An optical structure is provided wherein a windowed demetallized hologram is hot stamped on to an optically variable foil and wherein the demetallized hologram optionally has a coating of optically variable ink thereon. In another embodiment a hologram is hot stamped to a banknote or document printed with a color-shifting ink.
Apparatus For Orienting Magnetic Flakes
Granted: July 26, 2007
Application Number:
20070172261
A printing apparatus includes a magnetic rotatable roller with a smooth even outer surface for aligning magnetic flakes in a carrier, such as an ink vehicle or a paint vehicle to create optically variable images in a high-speed, linear printing operation. Images can provide security features on high-value documents, such as bank notes. Magnetic flakes in the ink are aligned using magnetic portions of the roller, that can be formed by permanent magnets embedded in a non-magnetic roller…
Single Spatial Mode Output Multi-Mode Interference Laser Diode With External Cavity
Granted: July 5, 2007
Application Number:
20070153859
The invention relates to a conventional broad-area laser having a single-mode output through the phenomenon of multimode interference (MMI) in step-index waveguides. Another aspect of the present invention relates to a very robust multi-mode compound cavity laser design that is fully defined by the geometry and the refractive index profile of the MMI region, which is quite insensitive to slight macro-scale refractive index variations due to manufacturing variation or temperature. As the…
Security Device With Metameric Features Using Diffractive Pigment Flakes
Granted: June 21, 2007
Application Number:
20070139744
A metameric optical structure is disclosed having first optical structures comprising diffractive flakes having diffractive structures thereon, and a second optical structures having non-diffractive flakes which may have other special effect properties, such as color shifting. At one angle of incidence or one viewing angle, near normal. The hues match and at other angles they do not match. The diffractive flakes are preferably magnetically aligned so that the grating structures are…
End Of Line Monitor Using DOCSIS
Granted: June 14, 2007
Application Number:
20070133425
The invention relates to a system for end-of-line monitoring of HFC networks by using a main tuner dedicated to receiving measurement requests from a network monitoring server via a DOCSIS downstream channel, and an auxiliary tuner used for the purpose of performing measurements of the downstream channel by analogue and digital measurement circuits. A cable modem is used to transmit measurement results to the server over a DOCSIS upstream channel. The addition of the auxiliary tuner,…
Fault Sensor For A Laser Driver Circuit
Granted: June 7, 2007
Application Number:
20070127918
An apparatus and method is provided for sensing which faults have occurred in a laser control system, as well as trapping and identifying the first fault occurrence. The apparatus includes an integrated circuit in which a mask register is set by means of a micro-controller or a host system to select which fault sources are to be recorded. A status bit register in which the fault indications are stored can also be interrogated by the micro-controller or a host system. A settable first…
Magnetic Plate For Printing Of Optical Effects
Granted: May 24, 2007
Application Number:
20070115337
This invention discloses a magnet for use as a printing plate or printing head that is used for aligning flakes or particles in a paint or ink. A composite sheet or block of magnetizable material is selectively magnetized so that a magnet is formed within the sheet or block that has a shape of a predetermined image, logo, or indica. Dies are used to magnetize the magnetizable material and preferably the does contact the material to be magnetized. A pre-magnetized sheet such as a…
Modular Solid-State Laser Platform Based On Coaxial Package And Corresponding Assembly Process
Granted: May 24, 2007
Application Number:
20070116082
Application of a modular coaxial package design, compatible with telecommunication passive component packaging, to microchip lasers, in particular to passively Q-switched microlasers, pumped with a fiber-coupled diode, is disclosed. The number of parts is thereby reduced while providing the adequate degrees of freedom for the active or passive alignment of the optical elements within the package.
Pulse Shaping Circuit
Granted: May 10, 2007
Application Number:
20070104232
The invention relates to a pulse shaping circuit for shaping electrical pulses driving an optical transmitter, e.g. a lased diode or an LED, and for providing electrical pulses having independently height and width-adjustable peaking at the edges thereof. The pulse shaping circuit of the present invention includes a high-pass RC filter with a differential output for providing transient electrical pulses from an input differential pulse, an adjustable voltage offset generating circuit, a…
Electronically Compensated LCD Assembly
Granted: April 19, 2007
Application Number:
20070085972
The invention relates to a method of electronic contrast enhancement for an LCD panel for use in an imaging device. The method comprises the step of coupling the LCD panel with a trim retarder in a pre-determined azimuthal orientation for at least partially compensating the residual in-plane retardance, followed by the step of non-mechanical fine-tuning of a dark state of the LCD panel. In the preferred embodiment, the fine-tuning of the dark state of the LCD panel is realized by…
Grating trim retarders
Granted: March 29, 2007
Application Number:
20070070276
A grating trim retarder fabricated from a form-birefringent multi-layer dielectric stack including at least one anti-reflection coating and supported on a transparent substrate is provided. The form-birefringent dielectric stack includes an axially-inhomogeneous element in the form of a ?C-plate grating and a transversely-inhomogeneous element in the form of an A-plate grating. Each of the ?C-plate and the A-plate gratings are fabricated with dimensions to form a zeroth order…
Optimally Clocked Trim Retarders
Granted: March 22, 2007
Application Number:
20070064163
A trim retarder for a liquid crystal display based projection system including a light source, a polarizer/analyzer, a liquid crystal display panel, and a projection lens, is clocked to an optimal azimuthal angle that provides a system contrast level substantially unaffected by the orientation of the slow axis of the liquid crystal display panel.
Passively Q-Switched Microlaser With Controllable Peak Power Density
Granted: March 22, 2007
Application Number:
20070064747
Geometrical design of laser microchips is disclosed that allows variation of the optical path length in the different media by simple displacement of the microchip, the movement having a non-zero projection orthogonal to the pump beam. The concept can be implemented to vary optical loss in the lasing cavity, the absorbed pump power, or the optical length of the cavity. Passively Q-switched microchip laser output performance can thus be controlled by simple transverse displacement of the…
Patterned Optical Structures With Enhanced Security Feature
Granted: March 15, 2007
Application Number:
20070058227
A security image and method for forming said image is disclosed wherein an image having a layer with a hologram therein has an additional layer of magnetically aligned flakes together forming an image that is difficult to counterfeit and is highly attractive. Preferably windows of an opaque layer provide additional means of encoding or forming the image.
Optical transceiver and cage system to prevent insertion of new transceiver models into legacy cages
Granted: March 8, 2007
Application Number:
20070054551
To prevent newly developed transceiver modules from being plugged into legacy cages, which may not have the correct electrical connector therein, the new transceiver modules are built with one or more tabs extending outwardly therefrom for abutting an edge of the opening of the cage, thereby preventing the transceiver module from being fully inserted into the cage. New cages, which include the correct electrical connector, are built with slots extending from the opening of the cage to…
