Abstract:
A method and associated structure for excising laminate chip carriers from a panel that has a thickness less than about 100 mils. A laser beam is focused on a surface of the panel, and the panel is moved relative to the laser beam in a geometric pattern, such that cells of the panel (e.g., chip carriers) are excised from the panel. The laser parameters include a wavelength between about 500 nanometers and about 600 nanometers, a pulse width greater than about 100 nanoseconds and less than about 350 nanoseconds, an average power of at least about 1 watt, a pulse repetition rate between about 5,000 pulses/sec and about 20,000 pulses/sec, and a target diameter (D) between about 2 microns and about 30 microns. The kerf width between adjacent excised cells is between about 2 microns and about 75 microns. The width of an excised cell is at least 5 mm. A displacement between successive pulses of the laser beam is less than about 2D. The panel may comprise a layered structure that includes an organic layer and a metal layer. The laser includes, inter alia, a lasant of Nd:YAG, Nd:YLF, Nd:YAP, or Nd:YVO4. The method of the present invention wastes less panel area by at least a factor of about 13 than does the mechanical excising techniques of the related art.
Abstract:
A unified process of making an electrical structure includes performing a plurality of laser etching operations on workpiece, without removing the workpiece from a laser processing system. The workpiece includes a conductive material disposed on an electrically insulating substrate, and the plurality of laser etching operations include, but are not limited to, two or more of forming a fiducial, forming thick metal traces separated by high aspect ratio spaces, cutting an alignment hole, cutting a folding line, and singulating the electrical structure. In another aspect of the invention, a database is prepared, and communicatively coupled to the laser processing system to provide control signals that direct a portion of the plurality of operations of the laser processing system, wherein each plurality of etching operations is defined with respect to a common coordinate system.
Abstract:
A tool for separating a common printed wiring board substrate into a plurality of substrates where, prior to separation, the plurality of substrates are connected by at least one circuit connector. The purpose of the tool is to apply pressure along a dividing line to break the common substrate into separate boards without crimping or breaking the connectors between the boards. In a preferred embodiment, the tool has a beveled edge for contacting the common substrate with mechanism for adjusting the location of notches in the beveled edge. The notches are for alignment with the location of the connectors between the boards.
Abstract:
An apparatus for separating individual circuit boards from a multiple board array with pre-scored planes 10 is provided. The apparatus includes a splitting element 36, positioned along one of the pre-scored planes 28, and a torque inducing element 38 mechanically forcing the multiple board array 20 onto the splitting element 36 thereby breaking the board array 20 along the pre-scored plane 28.
Abstract:
A method of fabricating a laminated circuit assembly and the assembly made therefrom including the steps of providing a relatively stiff substrate. A U-shaped slit is cut in the substrate in an area where a peripheral pull tab subsequently is to be located. The side legs of the U-shaped configuration define spaced slit portions. A relatively flexible backing sheet is adhered to a back side of the substrate. The laminated substrate and backing sheet are cut with a peripheral cut intersecting the side legs of the U-shaped slit, with the peripheral cut forming a pull tab projecting outwardly from the U-shaped slit. The pull tab can be grasped and separated from the substrate to strip the backing sheet therefrom.
Abstract:
A method for manufacturing two kinds of printed circuit boards from one master board, comprises the steps of preparing the master board, forming slits on the master board to define a first circuit area, and executing: (a) forming first cut grooves extending substantially perpendicular to the slits so as to across outer side of both ends of the slits on the master board to define a second circuit area which surrounds the first circuit area, and cutting the master board along the first cut grooves to separate a first individual circuit board including the first and second circuit areas, or (b) forming second cut grooves on the master board so as to across both ends of the slits, and cutting the master board along the second cut grooves to separate a second individual circuit board including only the first circuit area.
Abstract:
An improved printed circuit board capable of being received by two different types of connector panels is disclosed. The printed circuit board includes a main board portion, and a breakaway board portion. The main board portion includes a first connector. The breakaway board portion is coupled to the main board portion utilizing perforations. The breakaway board portion includes a second connector. The breakaway board portion is capable of being completely detached from the main board portion. The main board portion is electrically coupled to the breakaway board portion utilizing a flexible ribbon cable. The printed circuit board is capable of being received by either a first or a second type of connector panel. The first type of connector panel includes a first connector receptacle and a second connector receptacle disposed in a first configuration. The first connector receptacle is capable of receiving the first connector, and the second connector receptacle is capable of receiving the second connector when the breakaway board portion remains attached to the main board portion. The second type of connector panel includes a third connector receptacle and a fourth connector receptacle disposed in a second configuration. The third connector receptacle is capable of receiving the first connector, and the fourth connector receptacle is capable of receiving the second connector when the breakaway board portion is detached from the main board portion.
Abstract:
A method of producing a semiconductor device of the present invention is applicable to a multilayer wafer for leadless chip carrier packages and breaks it on a package basis. The method begins with a step of forming a generally V-shaped groove in one major surfaces of the wafer in the direction of thickness of the wafer. A weak, cleaving portion is formed in the other major surface of the wafer in alignment with the groove. A cleaving force is exerted on the wafer to thereby form a break in the cleaving portion, so that the wafer is caused to break from the groove toward the cleaving portion in the direction of thickness of the wafer. The cleaving portion may be replaced with a strong, non-cleaving portion, in which case the break is formed in the interface between the non-cleaving portion and the wafer due to a difference in cleaving force.
Abstract:
A multilayer integrated substrate includes breaking grooves arranged in a grid pattern so as to section the main surface of the substrate into a plurality of blocks, and also includes fracture-preventing conductor films arranged so as to cross the breaking grooves. The fracture-preventing conductor films contain a metal component that prevents undesirable fracturing of the multilayer integrated substrate along the breaking grooves.
Abstract:
Circuit boards are formed within the boundaries of an insulative sheet or panel such that the panel may be automatably processed. The periphery of each printed circuit board is defined by at least a plurality of score lines which do not extend to the edge of the sheets and may include also uncut and/or unscored areas to provide stability to either the sheet or segments of scrap material, lending rigidity to the sheet. Following complete fabrication of the printed circuit board, the sheet is cut by a routing process to extend selected score lines to the edges of the sheet to destroy the integrity of the frame of scrap material surrounding the printed circuit boards.