Patent ID: 6853091

Claim:
A printed circuit board comprising: a substrate having first and second opposite surfaces, a plurality of terminal holes being formed through said substrate from said first surface to said second surface thereof; an electrically conductive circuit pattern provided on said first surface of said substrate; wherein said electrically conductive circuit pattern comprises a plurality of composite lands, each of said composite lands including a first land having a center hole aligned with one of said terminal holes of said substrate so as to allow said center hole and said terminal hole to receive a terminal of an electric or electronic part or device, and a plurality of second lands each being contiguous to and extending radially outwardly from said first land; wherein, for each of said composite lands, thermal insulating areas are formed radially outwardly of said first land and circumferentially between adjacent ones of said second lands, each of said thermal insulating areas being constituted by an area of said substrate that is devoid of a conductive layer thereon so as to inhibit thermal conduction away from said first and second lands; and wherein, for each of said composite lands, a narrow resist layer is formed so as to be arranged along a border between said composite land and each of said thermal insulating areas.