摘要:
A printed wiring board, particularly, an interposer 20 for a chip scale package, comprising an outer insulator layer 22 having outer electrodes 31, a conductor layer 21, and an inner insulator layer 23 having inner electrodes 27, the electrodes 31 and/or 27 having been formed by electroplating using, as a negative electrode, a metal plate 32 that has been provided on the outer insulator layer 22 and removed after the electroplating. Having no plating leads, the printed wiring board has the electrodes in an orderly array at a fine pitch and a high density.
摘要:
The present invention provides a resin composition for a wiring circuit board; a substrate for a wiring circuit board in which a base insulating layer has been formed from the resin composition for a wiring circuit board; and a wiring circuit board having insulating layers including a cover insulating layer formed from the resin composition for a wiring circuit board. The resin composition for a wiring circuit board, the substrate for a wiring circuit board, and the wiring circuit board can prevent warpage and curling, increase adhesion between the insulating layer and the conductor layer, and enhance the durability and reliability of the wiring circuit board. The resin composition for a wiring circuit board contains a polyimide resin precursor, and a polyhydric phenol compound.
摘要:
A method for manufacturing a flexible printed circuit in which a resin solution is applied onto a circuit substrate having a wiring pattern on its surface so as to form a resin cover layer, having the steps of: wetting the surface of the circuit substrate with a solvent which is capable of dissolving the resin; applying the resin solution onto the surface wetted with the solvent; and drying the resin solution to thereby form the resin cover layer. A flexible printed circuit obtained in the manufacturing method.
摘要:
A photosensitive resin composition which is excellent in both sensitivity and resolution, can be rapidly developed with an aqueous alkali solution alone, further has excellent adhesion to substrates, and can give through imidization a light-colored polyimide resin film; and a circuit board having an insulating layer obtained from the photosensitive resin composition. The photosensitive resin composition comprises a poly(amic acid) resin, a 1,4-dihydropyridine derivative and a polyethylene glycol, and may optionally further contain a polyhydric phenol compound. This photosensitive resin composition can be developed at a high rate with a developing solution consisting only of an aqueous alkali solution. As a result, a satisfactory negative-pattern film which is a light-colored film can be formed with high sensitivity, high resolution, and a reduced film loss while preventing film coloration.
摘要:
A photosensitive polyimide resin precursor composition capable of providing a polyimide resin that is not substantially colored, is transparent and has heat resistance, an optical polyimide resin obtained from the composition, and an optical waveguide using the polyimide resin. The photosensitive polyimide resin precursor composition contains (a) 100 parts by weight of a polyamic acid obtained from a tetracarboxylic acid dianhydride and a diamine, (b) 0.01 parts by weight or more and less than 5 parts by weight of a 1,4-dihydropyridine derivative, (c) 5-50 parts by weight of a glycol (ether). The optical polyimide resin is obtained by irradiating the photosensitive resin precursor composition with UV light, followed by exposure, heating, development, and then heating. The optical waveguide comprises a core layer comprising the optical polyimide resin, and a cladding layer thereof.