TWO-AXIAL ALIGNMENT OF MAGNETIC PLATELETS
Granted: February 18, 2010
Application Number:
20100040799
A method of planarizing a plurality of orientable non-spherical flakes supported by a longitudinal web is disclosed. A web supporting a coating of field orientable non-spherical flakes is placed between magnets so that the fields from the magnets traverse the web. First and third magnets are provided on one side of a feedpath and a second magnet is provided between the first and third magnets on the other side of the feedpath. The first and third magnets have a same polarity and the…
CONTRAST COMPENSATION OF MICRODISPLAY PANELS INCLUDING A HIGH ORDER WAVEPLATE
Granted: February 4, 2010
Application Number:
20100026945
A contrast compensator for improving the panel contrast of liquid crystal (LC) microdisplays having a high-order waveplate configured as an O-plate and supporting a thin film transistor layer is provided. The contrast compensator includes a counter high-order waveplate configured as an O-plate, which has a birefringence opposite in sign to a birefringence of the thin film transistor substrate.
METHOD AND APPARATUS FOR ORIENTING MAGNETIC FLAKES
Granted: January 28, 2010
Application Number:
20100021658
The invention relates to a method of aligning magnetic flakes, which includes: coating a substrate with a carrier having the flakes dispersed therein, moving the substrate in a magnetic field so as to align the flakes along force lines of the magnetic field in the absence of an effect from a solidifying means, and at least partially solidifying the carrier using a solidifying means while further moving the substrate in the magnetic field so as to secure the magnetic flakes in the carrier…
Security Device With Metameric Features Using Diffractive Pigment Flakes
Granted: January 7, 2010
Application Number:
20100002275
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…
High confinement waveguide on an electro-optic substrate
Granted: December 31, 2009
Application Number:
20090324163
The invention relates to an optical device including a passive high confinement waveguide, such as of silicon-rich silicon nitride, on an electro-optic substrate, like lithium niobate, optically coupled to a waveguide in the electro-optic substrate. A wide range of electro-optic devices are enabled by this high confinement waveguide structure, including: directional couplers, compact tap couplers, folded electro-optic devices, electro-optic modulators including ring resonators,…
HIGH CHROMA OPTICALLY VARIABLE COLOR-SHIFTING STRAND AND WOVEN PRODUCTS
Granted: December 31, 2009
Application Number:
20090324856
Opaque color shifting strands are disclosed that have an optically variable color with a change in angle of incident light. The strands have an organic substrate and an optical interference structure on one or both sides of the organic substrate. The optical interference design can be a Fabry-Perot structure or can be optically variable ink. Plural strands can be combined to form a textile for example such as a garment label.
Multiple-Pathway Optical Transmitter
Granted: December 17, 2009
Application Number:
20090310915
Optical systems comprise one or more optical pathways including lenses that are offset with respect to each other and lenses that are offset with respect to optical fibers.
INTEGRATED ON-CHIP INDUCTORS AND CAPACITORS FOR IMPROVED PERFORMANCE OF AN OPTICAL MODULATOR
Granted: December 3, 2009
Application Number:
20090297088
An optical modulator for fiberoptic telecommunications is disclosed in which the optical signal velocity in the modulator waveguide and the electrical signal velocity in the traveling wave signal electrode are purposely mismatched by a factor of up to about 4. On-chip integrated inductors and capacitors are implemented to achieve the velocity mismatch. Improved electro-optic characteristics, such as return loss and sharper cut-off bandwidth are obtained.
Photodiode Assembly With Improved Electrostatic Discharge Damage Threshold
Granted: November 19, 2009
Application Number:
20090283848
A photodiode with an improved electrostatic damage threshold is disclosed. A Zener or an avalanche diode is connected in parallel to a photodiode. Both diodes are integrated into the same photodiode housing. The diodes can be mounted on a common header or onto each other. An avalanche photodiode and an avalanche diode can be fabricated on a common semiconductor substrate. A regular p-n diode connected in series, cathode-to-cathode or anode-to-anode, to a Zener diode, forms a protection…
DC COUPLED DRIVER WITH ACTIVE TERMINATION
Granted: October 29, 2009
Application Number:
20090268767
A DC coupled driver is described for modulating a vertical cavity surface emitting laser at high speeds with active termination. High speed and low total power dissipation is achieved by improving the driver immunity to pulse reflections, which can arise due to impedance mismatch between the driver output impedance and the VCSEL impedance. The rise and fall times of the driver may be adjusted for particular applications. The driver may be fabricated using a choice of bipolar, NMOS and…
OVD CONTAINING DEVICE
Granted: October 8, 2009
Application Number:
20090251749
A holographic overlay is provided, including: a polycarbonate substrate having a first side and a second side, a diffractive structure cast upon the first side of the polycarbonate substrate, and a reflection-enhancing coating on at least a part of the diffractive structure; wherein the second side of the polycarbonate substrate provides a substantially flat external surface of the overlay capable of fusing to a conforming surface in the presence of heat and pressure without an adhesive.…
REDUCED FEEDBACK OPTICAL TRANSMITTER
Granted: October 8, 2009
Application Number:
20090252192
A device including a laser with reduced feedback.
Semiconductor Photodiode And Method Of Manufacture Thereof
Granted: October 1, 2009
Application Number:
20090242933
A method of manufacture of an avalanche photodiode involving a step of making a recess in a top window layer of an avalanche photodiode layer stack, such that a wall surrounding the recess runs smoothly and gradually from the level of the recess to the level of the window layer. Further, diffusing a dopant over the entire window layer area so as to form a p-n junction at the bottom of the recess, and providing a first electrical isolation region around the recess by buried ion…
Photodiode And Method Of Fabrication
Granted: October 1, 2009
Application Number:
20090242934
The present invention provides a highly reliable photodiode, as well as a simple method of fabricating such a photodiode. During fabrication of the photodiode, a grading layer is epitaxially grown on a top surface of an absorption layer, and a blocking layer, for inhibiting current flow, is epitaxially grown on a top surface of the grading layer. The blocking layer is then etched to expose a window region of the top surface of the grading layer. Thus, the etched blocking layer defines an…
Tapered Fiber Retroreflector
Granted: September 17, 2009
Application Number:
20090232453
An expanded-beam all-glass retroreflector for a fiber laser cavity. The retroreflector consists of a section of a tapered double-clad fiber for beam expansion, e.g. a tapered section of the laser fiber itself, or a piece of coreless fiber spliced to the laser fiber, and a reflective surface for reflection of the expanded beam back into laser cavity through the tapered fiber section.
LOW-NOISE OPTICAL TRANSMITTER
Granted: September 10, 2009
Application Number:
20090226133
A device comprising: an optical subassembly has a lens rear surface including one or more facets for scattering at least some of the light transmitted through the lens rear surface.
FLAKES WITH UNDULATE BORDERS AND METHOD OF FORMING THEREOF
Granted: September 3, 2009
Application Number:
20090217842
The invention provides a plurality of substantially same planar pigment flakes, each formed of one or more thin film layers. Each flake has a face surface and a flake border delimiting the face surface; the flake border undulates in the plane of the flake. The flakes have a pre-selected shape, may have a symbol or a grating thereon. A method of manufacturing of these flakes including the steps of: (a) providing a substrate having a plurality of one-flake regions and a plurality of…
Medium for laser printing including optical special effect flakes
Granted: August 13, 2009
Application Number:
20090202932
A laser toner includes optical effect taggent flakes or other structures in a binder suitable for binding particles to a substrate. Preferably the optical effect taggent structures have a substantially same shape or same indicia within the binder sized to be suitable for laser printing. After printing the flakes or structures become bonded to the substrate they are printed upon and are discernable by viewing with magnification.
OPTICAL PICK-UP UNIT WITH TWO-MIRROR PHASE SHIFTER
Granted: July 30, 2009
Application Number:
20090190463
Optical pick-up units (OPU), which require several light sources for reading newer formats, such as Blu-Ray, and legacy formats, such as DVD and CD, require a series of beam splitters/combiners for directing the various source light beams from the light sources along a common path. A two-mirror reflector sub-unit, in which at least one mirror includes a thin film dielectric retarder element, is used to redirect the beams traveling along the common path onto the disc-media, while imposing…
Waveguide Retroreflector And Method Of Fabricating The Same
Granted: July 16, 2009
Application Number:
20090180511
A waveguide retroreflector consists of an end cap with curved output surface attached to a waveguide such as optical fiber. The radius of curvature of the output surface of the end cap matches the length of the end cap so as to retro-reflect a substantial portion of radiation exiting the waveguide, back into the waveguide. A method of fabricating the waveguide retroreflector includes steps of splicing an end cap to a waveguide, heating the free flat surface of the end cap, so that…
