Abstract: The present invention discloses a method and system for the verification of a cashier's check. The method and system involves a verification machine-readable code that can be verified online for authenticity and status. It can further be used to authorize payment.

Abstract: The present invention discloses a method and system for the verification of a cashier's check. The method and system involves a verification machine-readable code that can be verified online for authenticity and status. It can further be used to authorize payment.

Abstract: A packaged light emitting device includes a frame, a cover, and a light emitting device. The light emitting device is disposed between the cover and the frame. A portion of the cover is flexible and a portion of the cover is rigid. The cover includes a flange and is attached to the frame by positioning the rigid portion of the cover to maintain the flange in a nest formed in the frame. In some embodiments, a stake is disposed over the sunken surface that forms the nest in the frame, and the cover is held in place by positioning the flange between the sunken surface and the stake. In some embodiments, the flange is the same material as the flexible portion and the rigid portion is a ring that extends into the flange.

Abstract: A light emitting device includes a lens and a semiconductor light emitting device chip underlying the lens. The lens may be a fluoropolymer material. In some embodiments, the semiconductor light emitting device chip is capable of emitting light having a peak wavelength ranging from green through blue. The clarity of the fluoropolymer lens is essentially unchanged after 500 hours of exposure to 600 mW of light at 85° C. and 60% relative humidity.

Abstract: A shaft angle encoder is provided with a symmetrical code wheel and pattern of photodetectors for providing an index pulse indicative of shaft angular position. The code wheel has two concentric index tracks each of which is symmetrical in a circumferential direction and are symmetrical with respect to each other and also with respect to a data track for indicating increments of angular position. In an exemplary embodiment there is a pair of windows of unit width in the one index track with a spoke therebetween with a width of at least two units. A pair of lateral windows extend away from each other more than a unit width along the second track. An opaque area at least two units wide is provided between the lateral windows in the second track.

Abstract: An optical shaft angle encoder has a plurality of active photodiodes in an array on a semiconductor chip. A rotary code wheel has alternating areas for alternately illuminating or not illuminating the active photodiodes in response to the rotation of the wheel. Errors in the duty cycle involving the end active photodiodes in the array are largely avoided by having a plurality of inactive photodiodes at each end of the array with width and electrical properties effectively the same as the active photodiodes so that leakage current to each end active photodiode of the array is substantially equal to the leakage current to active photodiodes remote from the end of the array. Similarly, leakage current may affect the duty cycle of individual photodiodes may be minimized by surrounding the individual photodiodes with a reverse biased photodiode junction.

Abstract: An optical shaft angle encoder has a plurality of active photodiodes in an array on a semiconductor chip. A rotating code wheel has alternating areas for alternately illuminating or not illuminating the active photodiodes in response to the rotation of the wheel. Errors in the duty cycle involving the end active photodiodes in the array are largely avoided by having a plurality of inactive photodiodes at each end of the array with width and electrical properties effectively the same as the active photodiodes so that leakage current to each end active photodiode of the array is substantially equal to the leakage current to active photodiodes remote from the end of the array. Similarly, leakage current which may affect the duty cycle of individual photodiodes may be minimized by surrounding the individual photodiodes with a reverse biased photodiode junction.

Abstract: An optical comparator has three bifurcated and truncated lenses, each lens having two siamesed and truncated elements having closely spaced optical axes. This results in an optical encoder having a low sensitivity to eccentricity errors.

Abstract: A three-channel optical shaft angle encoder has two channels for encoding the incremental angle and the direction of rotation of a shaft. A third channel provides a synchronizing index pulse for encoding the absolute position of the shaft once per revolution. The encoder has an emitter module containing three high irradiance LED emitters and integral truncated collimating lenses for producing three closely spaced collimated light beams, one beam for each channel. These light beams are modulated as a function of the relative angle between a code wheel coupled to the shaft and a phase plate fixedly mounted to the body of the encoder. The modulated light beams are received by a detector module having beam splitting truncated and siamesed lenses positioned to split each of the closely spaced light beams and to focus each of the split beams onto a photo detector pair.

Abstract: The transducer of this invention utilizes an annular lithium niobate crystal operated in the compression mode with the sensitive axis of the crystal arranged at an angle of about -51.4.degree. to the Z, or optical, axis of the crystal in the first and third quadrants of the Y-Z plane of the crystal. This accelerometer has high efficiency and operates effectively over a wide range of temperatures, including high temperatures above 1000.degree. F.