摘要:
In a method of removing a component (1) from a wiring board (4) to which the component is attached by heat-softenable resin (3), the improvement is provided of, after softening of the resin by heat and removal of the component (1), removing residual resin remaining on the board at the location of the component by application of ultraviolet laser radiation having intensity sufficient to decompose and disperse said residual resin. This can be done without damaging the wiring on the board so that the wiring is re-usable to attach a further electronic component at the same location. Excessive heating of the board can be avoided by measures such as applying a pre-load to the component during softening so that it moves when sufficiently softened, and monitoring the softening.
摘要:
The present invention provides a composite magnetic body containing metallic magnetic powder and thermosetting resin and having a packing ratio of the metallic magnetic powder of 65 vol% to 90 vol% and an electrical resistivity of at least 10 4 Ω·cm. When a coil is embedded in this composite magnetic body, a miniature magnetic element can be obtained that has a high inductance value and is excellent in DC bias characteristics.
摘要:
The present invention provides a method of manufacturing a wiring board, including the steps of forming a through hole (5) on a prepreg (10) having a releasing resin film (3,4) on at least one of its surfaces, the prepreg (10) being obtained by impregnating a porous film having a thickness of 5 to 90µm and a porosity of 30 to 98% with a half cured thermosetting resin, filling the through hole (5) with a conductive paste (6) containing a conductive filler, peeling the resin film (3,4), laminating a metal foil (11,12) on a surface from which the resin film (3,4) is peeled, and heating and pressurizing the laminated product. Moreover, the present invention provides a wiring board including an insulating layer (10) obtained by impregnating a porous film having a thickness of 5 to 90µm and a porosity of 30 to 98% with a thermosetting resin and curing them, and a conductive connection structure between wiring layers in which a through hole (5) provided on the insulating layer is filled with a conductive paste (6), wherein the conductive connection structure has the conductive filler at only a boundary surface with the porous film and in an inner part thereof.
摘要:
The present invention provides a method of manufacturing a wiring board, including the steps of forming a through hole on a prepreg having a releasing resin film on at least one of its surfaces, the prepreg being obtained by impregnating a porous film having a thickness of 5 to 90µm and a porosity of 30 to 98% with a half cured thermosetting resin, filling the through hole with a conductive paste containing a conductive filler, peeling the resin film, laminating a metal foil on a surface from which the resin film is peeled, and heating and pressurizing the laminated product. Moreover, the present invention provides a wiring board including an insulating layer obtained by impregnating a porous film having a thickness of 5 to 90µm and a porosity of 30 to 98% with a thermosetting resin and curing them, and a conductive connection structure between wiring layers in which a through hole provided on the insulating layer is filled with a conductive paste, wherein the conductive connection structure has the conductive filler at only a boundary surface with the porous film and in an inner part thereof.
摘要:
A method of producing a cathode-ray tube apparatus having a light-transmitting film provided on the panel glass thereof includes a process for treatment of the surface of the panel glass including the steps of: coating a surface of the panel glass (4) which has been subjected to no external polishing with an ultraviolet-curing resin composition which gives a cured material (11) having a refractive index substantially the same as that of said panel glass (4); providing a light-transmitting film (12) on said ultraviolet-curing resin composition (11); and curing said ultraviolet-curing resin composition (11) by irradiation with ultraviolet radiation, thereby integrating said panel glass (4), ultraviolet-curing resin composition (11) and light-transmitting film (12) into one unit; wherein said panel glass (4) provided with the light-transmitting film (12) is accommodated in a vacuum container (16) at least one side of which is made of a transparent rubber sheet (17) which transmits ultraviolet radiation, and while said vacuum container (16) is being evacuated, said light-transmitting film (12) is squeegeed through said transparent rubber sheet (17), and said ultraviolet-curing resin composition (11a) is cured by irradiation with ultraviolet radiation through said transparent rubber sheet (17).
摘要:
Electronic parts that have axially extending leads are separated from a first strip on which they are supplied for being rearranged and retaped to provide a second strip for supply to an automatic assembly machine. The parts are separated from the first strip by cutting the strip transverse to the strip at locations between adjacent parts. The tape chips remaining on the separated parts are removed by engaging them with movable jigs, located on opposite sides of a body portion of the part, and by moving the jigs along the leads away from the body portion. The jigs are mounted on a rotating rotor and engage grooves in a stationary cam. The jigs move toward and away from each other by the engagement with the grooves as the jigs are moved around the stationary cam. After the parts are separatd and the tape chips removed, the parts are transferred to a retaping machine to be attached to the second strip.