摘要:
A method of making a multilayer, printed wiring board may include pre-drilling a prepreg sheet to form a hole free of glass fibers. The hole has a first diameter. The method includes laminating the pre-drilled prepreg sheet between a copper foil and a substrate and allowing the hole to fill with resin from the prepreg sheet, patterning the copper foil to create an opening in a location associated with the resin-filled hole, drilling a via hole in the resin-filled hole, and metallizing the copper foil and the via hole. The via hole has a second diameter smaller than the first diameter.
摘要:
A dielectric film is formed on a free-standing conductive metal layer to form a multi-layer foil comprising a conductive metal layer, a barrier layer and a dielectric oxide layer. Such multi-layer foils are mechanically flexible, and useful for the manufacture of capacitors. Examples of barrier layers include Ni—P or Ni—Cr alloys. After a second layer of conductive metal is deposited on a dielectric oxide surface opposing the first conductive metal layer, the resulting capacitor foil is processed into a capacitor. The resulting capacitor is a surface mounted capacitor or is formed as a integrated or embedded capacitor within a circuit board.
摘要:
A method for forming an embedded low profile capacitor in a multilayer printed circuit board. The method entails providing a first metal plate on a dielectric substrate. A dielectric layer of a photopolymeric material is applied onto a first region of the first metal plate, surrounded by a second region that is exposed. A second metal plate is deposited onto the dielectric layer and the second region of the first metal plate. The second plate is then patterned to decline an upper electrode on the dielectric layer that is electrically isolated from the first metal plate. This may be accomplished by forming a trench in the second metal plate above the dielectric layer. In one aspect, the resulting capacitor thus comprises a lower electrode structure derived mainly from the first metal plate, a dielectric layer overlying the first region of the first metal plate and an upper electrode overlying the dielectric layer. The lower metal structure also includes an extension deposited onto the second region of the first metal layer about the dielectric layer and including a lip overlying a perimeter of the dielectric layer surface.
摘要:
A dielectric film is formed on a free-standing conductive metal layer to form a multi-layer foil comprising a conductive metal layer, a barrier layer and a dielectric oxide layer. Such multi-layer foils are mechanically flexible, and useful for the manufacture of capacitors. Examples of barrier layers include Ni—P or Ni—Cr alloys. After a second layer of conductive metal is deposited on a dielectric oxide surface opposing the first conductive metal layer, the resulting capacitor foil is processed into a capacitor. The resulting capacitor is a surface mounted capacitor or is formed as a integrated or embedded capacitor within a circuit board.
摘要:
A thin-film metal resistor (44) suitable for a multilayer printed circuit board (12), and a method for its fabrication. The resistor (44) generally has a multilayer construction, with the individual layers (34, 38) of the resistor (44) being self-aligned with each other so that a negative mutual inductance is produced that very nearly cancels out the self-inductance of each resistor layer (34, 38). As a result, the resistor (44) has a very low net parasitic inductance. In addition, the multilayer construction of the resistor (44) reduces the area of the circuit board (12) required to accommodate the resistor (44), and as a result reduces the problem of parasitic interactions with other circuit elements on other layers of the circuit board (12).
摘要:
A method for fabricating circuit board conductors with desirable processing and reduced self and mutual capacitance. The method generally entails forming a metal layer on a positive-acting photodielectric layer formed on a substrate, and then etching the metal layer to form at least two conductor traces that cover two separate regions of the photodielectric layer while exposing a third region of the photodielectric layer between the two regions. The third region of the photodielectric layer is then irradiated and developed using the two traces as a photomask, so that the third region of the photodielectric layer is removed. The two remaining regions of the photodielectric layer masked by the traces remain on the substrate and are separated by an opening formed by the removal of the third dielectric region. As a result, the traces are not only separated by a void immediately therebetween formed when the metal layer was etched, but are also separated by the opening formed in the photodielectric layer by the removal of the third region of the photodielectric layer. Traces formed in accordance with the above may be formed as adjacent and parallel conductors or adjacent inductor windings of an integral inductor.
摘要:
A device for use with an imaging system that is operable to provide an image signal based on an object disposed at a first distance from the imaging system. The imaging system includes a first camera, a second camera and a display. The first camera is operable to generate a first image signal based on the object and includes a first optics system and a first detector. The first optics system has a focal length, whereas the first detector has a resolution. The second camera is operable to generate a second image signal based on the object. The second camera includes a second optics system and a second detector. The second optics system has the same focal length of the first optics system and the second detector has the same resolution as the first detector. The second camera is separated from the first camera by a second distance. The display is operable to display an image based on a modified image. The device comprises an image processor that is operable to establish a virtual separation membrane and to output a modified image based on the first image signal, the second image signal, the virtual separation membrane, the second distance, the focal length and the resolution.
摘要:
A method of providing three dimensional (3D) information is disclosed in which a master recruits a local slave to provide contemporaneous images. The images are collected and 3D information extracted therefrom. The 3D information or various images may be transmitted to a remote device and is employed to provide a substitute background that replaces the background of the original image. Either the new image is displayed on one or both devices. The images can be collected and the 3D information extracted at either of the master or slave or at a separate device. To recruit the slave, the master broadcasts a query to all local devices, determines the available devices and their characteristics, automatically or manually selects a particular device, requests authorization from the selected device, and pairs with the selected device when authorization is received. Devices of the same or different types may be paired.
摘要:
A process for forming a laminate with capacitance and the laminate formed thereby. The process includes the steps of providing a substrate and laminating a conductive foil on the substrate wherein the foil has a dielectric. A conductive layer is formed on the dielectric. The conductive foil is treated to electrically isolate a region of conductive foil containing the conductive layer from additional conductive foil. A cathodic conductive couple is made between the conductive layer and a cathode trace and an anodic conductive couple is made between the conductive foil and an anode trace.
摘要:
A tunable high impedance surface device (100) includes a conductive ground plane (105) and a plurality of conductive elements (110-114) electrically connected to the conductive ground plane (105). The device (100) also includes a plurality of capacitive elements (120-124) operable to vary a predetermined electromagnetic characteristic of the apparatus and standoffs (130, 132) between the plurality of capacitive elements (120-124) and the plurality of conductive elements (110-114). In one form, laser-drilled and electrically conductive micro-vias (136, 138) extend through the standoffs (130, 132) thereby electrically connecting the plurality of capacitive elements (120-124) to a data bus (140). The capacitive elements (120-124) may be integral with a circuit board (144) that supports the plurality conductive elements (110-114). Either the capacitive elements (120-124) or the conductive elements (110-114) are mechanically flexible and selectively movable to controllably adjust the distance (142) between the capacitive and conductive elements.