Abstract:
A non-blocking, solid, adhesive composition which can be activated upon application of sufficient heat or ultrasonic energy without becoming C-staged, comprising (a) a first component having an epoxide-, hydroxy- or unsaturated functionality grater than 2, said polymeric resin being selected from the group consisting of polyesters, polyurethanes and epoxies; (b) a second component comprised of at least one filler, or at least one polyfunctional compound containing a polyaromatic backbone and having an average molecular weight below about 7000, or mixtures thereof, the weight ratio of said first component so said second component being between about 1.5 : 1 and about 9 : 1; and (c) a curing agent which is capable of reacting or initiating a reactio n with the functional groups of the polymeric resin to form crosslinks and cure the polymeric resin to a C-stage upon application of sufficient energy in the form of heat or radiant energy, said curing agent being non-reactive or blocked at the condition which will activate the adhesive composition, said curing agent being present in an amount sufficient to C-stage the polymeric resin. The adhesive composition is flexible, and in the C-stage, is capable of forming an infusible composition which does not melt, flow or decompose when exposed for 10 seconds to molten solder at 260°C and does not soften when exposed for 1 minute to dichloromethane at 25°C. The adhesive composition is suitable for bonding wire to a surface, to another wire or to itself.
Abstract:
An apparatus and method of forming filament circuit patterns with planar and non-planar portions and interconnection cards, smart cards or optical fiber circuit cards formed therefrom are provided. A filament circuit path is scribed by moving a filament guide and a substrate relative to one another, and dispensing a filament on, or in the vicinity of, a surface of the substrate. The filament or the substrate or both have adhesive surface(s). The adhesive surface is capable of being adhesively actuated by application of energy. Energy is applied simultaneous with, or subsequent to, scribing. A portion of the filament circuit pattern is planar and another portion is non-planar. The non-planar portion traverses but does not contact or adhere to a pre-selected area of the substrate. The pre-selected area corresponds with a pad, a contact pattern, a hole, a slot, a raised feature, a part of the previously scribed planar portion of the pattern, and a filament termination point. Alternately, the non-planar portion may be embedded below the surface of the substrate. Another planar portion of the filament circuit traverses the non-planar portion but does not contact or adhere to a pre-selected part of the previously scribed non-planar portion. According to the above method wire-scribed circuit boards are formed including interconnection cards, smart cards or optical fiber circuit cards.
Abstract:
A slotless stator for an electromechanical transducer, said stator including a stator shell (30) and a pre-formed, at least partially rigid, self-supporting winding structure having active segments and end-turns (40), is produced by a method that comprises depositing insulated wire on a support, adhesively affixing at least active wire segments portions to the support surface or previously deposited wires, with the active wire segments arranged in predetermined, substantially fixed positions with respect to each other, encapsulating and securely attaching the winding structure to the stator shell, and combining the completed stator with a structure including at least one permanent magnet mounted for movement relative to the stator. In a preferred embodiment, the self-supporting winding structure is removed from the support surface prior to insertion in the stator shell.
Abstract:
An optical inspection system for inspecting faults on circuit boards like printed circuit boards and wire scribed circuit boards is disclosed. A video camera (14) for receiving desired images of hole sites on a wire circuit board (18) is provided. The camera converts each image to electrical video signals. A frame grabber (12) converts electrical video signals to a plurality of pixels and stores information representing color element values contained in each of said pixels. A panel feature detector receives the color element values of the pixel that has to be analyzed and provides a wire indication when the color element value of the pixel corresponds to the wire feature. A fault detector circuit receives the wire indication from the panel feature detector corresponding to predetermined pixels associated with the hole site for determining faults on the circuit board.
Abstract:
An apparatus for detecting breaks in wire while the wire is being scribed is claimed wherein the apparatus measures changes, in real time, in the scribing system's electrical characteristics. These characteristics can be changes in phase shift and capacitance variations caused by breaks in the wire as the wire is scribed onto a workpiece.
Abstract:
The invention relates to a method for making coaxial conductor interconnection boards including, on the upper side of the board, signal conductors surrounded by a dielectric and by a conductive shield. To prevent shorting of the signal conductors with the shield, the conductors are step-stripped and the unshielded conductor end with the dielectric exposed is inserted in drilled, non-metallized holes. The completely exposed signal conductor extends to the lower side of the board and is connected conductively to terminals pads, while the shields on the upper side are connected by a conductive layer which is connected to the ground plane.
Abstract:
An apparatus and method of forming filament circuit patterns with planar and non-planar portions and interconnection cards, smart cards or optical fiber circuit cards formed therefrom are provided. A filament circuit path is scribed by moving a filament guide and a substrate relative to one another, and dispensing a filament on, or in the vicinity of, a surface of the substrate. The filament or the substrate or both have adhesive surface(s). The adhesive surface is capable of being adhesively actuated by application of energy. Energy is applied simultaneous with, or subsequent to, scribing. A portion of the filament circuit pattern is planar and another portion is non-planar. The non-planar portion traverses but does not contact or adhere to a pre-selected area of the substrate. The pre-selected area corresponds with a pad, a contact pattern, a hole, a slot, a raised feature, a part of the previously scribed planar portion of the pattern, and a filament termination point. Alternately, the non-planar portion may be embedded below the surface of the substrate. Another planar portion of the filament circuit traverses the non-planar portion but does not contact or adhere to a pre-selected part of the previously scribed non-planar portion. According to the above method wire-scribed circuit boards are formed including interconnection cards, smart cards or optical fiber circuit cards.