Abstract:
High quality epitaxial layers of piezoelectric monocrystalline materials can be grown overlying monocrystalline substrates such as large silicon wafers by forming a compliant substrate for growing the piezoelectric monocrystalline layers. An accommodating buffer layer comprises a layer of monocrystalline oxide spaced apart from a silicon wafer by an amorphous interface layer of silicon oxide. The amorphous interface layer permits the growth of a high quality monocrystalline oxide accommodating buffer layer. The accommodating buffer layer is lattice matched to both the underlying silicon wafer and the overlying piezoelectric monocrystalline material layer.
Abstract:
A flexible circuit board and a method for making a flexible circuit board. The flexible circuit board (10) is formed from a substantially rigid material and includes a first portion (12) and a second portion (14) coupled by a bend region (16). The bend region (16) includes at least one bend (40, 52) having a radius less than 120 mils.
Abstract:
A flexible circuit board and a method for making a flexible circuit board. The flexible circuit board (10) is formed from a substantially rigid material and includes a first portion (12) and a second portion (14) coupled by a bend region (16). The bend region (16) includes at least one bend (40, 52) having a radius less than 120 mils.
Abstract:
Una tarjeta de circuito flexible (10) caracterizado por: al menos una capa de un material del sustrato del circuito sustancialmente rígido (11), teniendo la, al menos una, capa una primera porción (12) y una segunda porción (14) y una región de doblado (16) que separa la primera y la segunda porción, estando formadas cada una de las porciones primera (12) y segunda (14) con trazas conductoras (32, 33) y con isletas conductoras para fijar e interconectar los componentes eléctricos a los mismos y conectar las trazas conductoras formadas entre la primera porción (12) y la segunda porción (14), extendiéndose las trazas conductoras de conexión (38) a través de la región de doblado (16); y estando plegada la primera porción (12) respecto a la segunda porción (14) formando un primer doblez (R1), un segundo doblez (R3) y un tercer doblez (R2) en la región de doblado (16), en el que el tercer doblez (R2) está intermedio entre el primer doblez (R1) y el segundo doblez (R3) y doblado en dirección opuesta a los mismos.
Abstract:
THE INVENTION PROVIDES A METHOD FOR ATTACHING A FLIP CHIP (210) TO AN ELECTRICAL SUBSTRATE (240) SUCH AS A PRINTED WIRING BOARD. A BUMPED FLIP CHIP IS PROVIDED, THE FLIP CHIP INCLUDING AN ACTIVE SURFACE AND A PLURALITY OF CONNECTIVE BUMPS (220) EXTENDING FROM THE ACTIVE SURFACE, EACH CONNECTIVE BUMP INCLUDING A SIDE REGION. A THIN LAYER OF AN UNDERFILL MATERIAL (230) IS APPLIED TO THE ACTIVE SURFACE OF THE FLIP CHIP AND TO A PORTION OF THE SIDE REGIONS OF THE CONNECTIVE BUMPS. THE FLIP CHIP IS POSITIONED ON THE ELECTRICAL SUBSTRATE, THE ELECTRICAL SUBSTRATE INCLUDING A THICK LAYER OF A SOLDER MASK (250) DISPOSED ON THE ELECTRICAL SUBSTRATE. THE FLIP CHIP IS HEATED TO ELECTRICALLY CONNECT THE FLIP CHIP TO THE ELECTRICAL SUBSTRATE, WHEREIN THE UNDERFILL MATERIAL AND THE SOLDER MASK COMBINE TO FORM A STRESS-RELIEF LAYER WHEN THE FLIP CHIP IS ELECTRICALLY CONNECTED TO THE ELECTRICAL SUBSTRATE.
Abstract:
An alternating current (AC) powered self organizing wireless node (100, 400, 600) includes a self organizing wireless receiver-transmitter (115), an AC branch connection (105), an AC to direct current (DC) converter (110), a secondary power function (120), and a housing (150). The self organizing wireless receiver-transmitter can communicate information throughout a network of compatible self organizing nodes solely using radio transmission to and reception from nearby self-organizing nodes. The secondary power function can couple power to the AC to DC converter for powering the self organizing wireless receiver-transmitter when AC power is not provided. The AC powered self organizing wireless node is designed and fabricated for agency certification. The AC powered self organizing wireless node may include one or more sensors (125), sensor inputs (135), transducers (130), or control outputs (155).
Abstract:
A method and apparatus for forming controlled stress fractures in metal produces electrically isolated, closely spaced circuit sub-entities for use on a metallized printed wiring board. A polymeric substrate (10) has a layer of metal (11) adhered to the surface, and the metal layer is formed into entities (12). Each entity (12) has a fracture initiating feature (14, 54) formed into it, which serves to initiate and/or direct a stress crack that is induced in the metal. The entities (12) are fractured in a controlled manner by subjecting the substrate (10) and the entities to mechanical stress by a rapid thermal excursion, creating a stress fracture in the entity extending from the fracture initiating feature. The stress fracture divides each entity (12) into two or more sub-entities (42) that are electrically isolated from each other by the stress fracture.
Abstract:
A flexible circuit board and a method for making a flexible circuit board. The flexible circuit board (10) is formed from a substantially rigid material and includes a first portion (12) and a second portion (14) coupled by a bend region (16). The bend region (16) includes at least one bend (40, 52) having a radius less than 120 mils.
Abstract:
An energizable design image portion (203) of a provided design pattern is printed on a provided substrate (201) using a functional ink comprised of at least one energy emissive material. A passive design image portion (202) of that design pattern is then also printed on that substrate using at least one graphic arts ink. In a preferred embodiment this apparatus may further comprise electrically conductive electrodes (204) on the substrate to permit selective energization of the energy emissive material to thereby induce illumination of the energizable design image portion of the design pattern.