Patent ID: 7161459
Filing Date: 2007-01-09
Classification: H01C

Abstract:
1. A method of manufacturing a chip resistor, the method comprising the steps of: a) providing an intermediate comprising: an alumina substrate, the substrate having a surface and two end portions; two surface electrode layers on the surface of the substrate, wherein each of the surface electrode layers is adjacent to one of the end portions of the substrate; a resistor layer electrically connected to the surface electrode layers; and a protective layer covering the resistor layer; b) forming a side electrode on each end portion of the substrate; wherein: each side electrode has a lightness; each side electrode is electrically connected to one of the surface electrode layers; each side electrode is formed by applying a conductive paste to each end portion of the substrate and to the surface electrode layer, and curing the conductive paste to produce a cured conductive paste; the conductive paste comprises conductive particles, carbon particles, and at least one resin; the conductive particles are either spherical, tear drop shaped, branch-shaped, square, or sponge-shaped, and c) checking the application state of the cured conductive paste by observing the lightness of the surface of the side electrode with an image recognition device, wherein the lightness of the surface of each side electrodes is not more than 6 as defined by JIS-Z8721.