摘要:
A high-density circuit substrate is housed in cassettes 52,54 which seal out deleterious contaminants to the substrate during processing, storage and transportation, thereby obviating necessity for clean-room environments. Substrate material is fed into and out of the cassette through a sealing aperture defined by and disposed through the housing wall. In use, a first feed cassette is releasably attached to a substrate processing apparatus which feeds raw substrate material, by means of a drive bushing on the spool, into the apparatus for punching, dielectric application, and the like. A second take-up cassette returns the thus-processed substrate into the cassette, again by means of rotation of the drive bushing, for storage and subsequent further manufacturing operations, wherein the take-up cassette is detached from the processing apparatus. The opposing inner faces of the housing are provided with symmetrical opposing spiraling grooves. When the substrate material is introduced into or pulled from the cassette, its edges travel in respective ones of these grooves. In this manner, the coil is maintained within the housing with a minute spatial separation between layers in the radial direction.
摘要:
A fine pitch pattern multilayer printed circuit board has laminar stackable board layers providing power distribution, signal distribution and capacitive decoupling. The board layers may be fabricated by beginning with a metallic core 1, patterning the core, selectively enclosing the core in a dielectric 6, selectively depositing metal 12 to form vias 13, plugs 14 and signal lines 16, and forming dendrites 19 with joining metallurgy on the vias and plugs to provide stackable connections from above or below the plane of the board layer. In addition, a sol-gel process may be used to form a thin high dielectric constant crystalline film 27 onto a metallic sheet 26 followed with a deposition of a metallic layer 29 onto the high dielectric constant film. The film serves as the dielectric of a capacitor layer which is thereafter in succession patterned, covered by a dielectric 40, and has selectively deposited a metallic layer 42 for interconnecting the capacitor and forming vias 37, 38. The ends of the vias are thereafter subject to dendritic growth and joining metallurgy to provide stackable interconnection capability. A multilayer composite laminar stackable circuit board structure is created using, as appropriate, layers having metallic cores and layers having capacitively configured cores. The multilayer laminar stackable circuit board provides direct vertical connection between surface mounted electronic components and the power, signal and capacitive decoupling layers of the composite board through the dendrites and joining metallurgy of the via and plug formations.
摘要:
A power management circuit for operating a magnetic repulsion punch comprising a storage capacitor 20 arranged to be connected in parallel with an inductive load 30 serving as an operating coil of the magnetic repulsion punch, a means 240, 440 for selectively and temporarily coupling the inductive load to the storage capacitor for forming a resonant circuit, and a means 100 for charging the storage capacitor after each operation.
摘要:
A multilayer, flexible substrate 64 upon which integrated circuit chips 60 can be attached is disclosed. The input/output(I/O) connections 62 from the chip do not radiate outward from the side of the die, but rather extend from a bottom surface. Since the I/O signal lines would not be accessible for testing once the IC chip is mounted on a substrate, each I/O line is extended outward 68 from the IC footprint to an area on the substrate which is accessible. Additionally, an electrical path from each I/O signal port is simultaneously passed through the substrate layers upon which the chip is mounted, thus providing electrical contact of all I/O ports to the underside of the flexible substrate. An integrated circuit chip is mounted on this flexible substrate. Since each I/O line is accessible after mounting, the IC chip can be tested prior to mounting on its ultimate carrier. Once tested, the IC chip and the substrate upon which it is mounted are excised from the roll of substrate material. This excised, pretested memory package, which includes both the IC chip and the flexible substrate, can then be mounted directly onto the ultimate carrier either by reflow soldering or direct bonding.
摘要:
An interconnect strip is provided for effecting electrical interconnection between pluralities of conductor pads disposed on circuit boards or the like in a high density configuration. The strip is fabricated from a polymer film carrier (10,30) having laminated thereon a metal foil with preselected spring properties. After lamination, lithographic techniques form a series of electrically isolated metallic beams (20) on the carrier. Additional chemical processing removes portions of the carrier at opposing sides of the strip to expose opposing ends of the beams which extend beyond the carrier parallel to one another in opposing directions outwards from the carrier. By urging the pads towards respective beam ends of the strip disposed between the pads until mating engagement therewith, a plurality of electrical interconnections are established through the beams. Flexural properties of the strip provide a low insertion force connection for a high density of conductors wherein the spring action of the strip assures favorable contact forces to the pads. The exposed film side of the strip may also be metalized and provided with beams or interconnected to beams on opposing side of the film by vias thereby providing a ground plane.