Abstract: A light-emitting element mounting substrate includes an insulative substrate including a single-sided printed circuit board, a pair of wiring patterns formed on one surface of the substrate, the wiring patterns being separated with a first distance, a pair of through-holes penetrating through the substrate in a thickness direction, the through-holes being separated with a second distance, and a pair of filled portions including a metal filled in the pair of through-holes to contact the pair of wiring patterns and to be exposed on a surface of the substrate opposite to the one surface. Each of the pair of filled portions has a horizontal projected area of not less than 50% of an area of each the pair of wiring patterns.

Abstract: A light-emitting element mounting substrate includes an insulative substrate including a single-sided printed circuit board, a pair of wiring patterns formed on one surface of the substrate, the wiring patterns being separated with a first distance, a pair of filled portions including a metal filled in a pair of through-holes to contact the pair of wiring patterns and to be exposed on a surface of the substrate opposite to the one surface, the pair of through-holes being formed to penetrate through the substrate in a thickness direction and to be separated with a second distance, and an insulation layer having a light reflectivity formed on the one surface of the substrate. The pair of filled portions each have a horizontal projected area of not less than 50% of each area the pair of wiring patterns, and the insulation layer includes an opening to expose the pair of wiring patterns.

Abstract: An IC module includes a film substrate, a plurality of wiring leads, an electrically insulative plastic, and an IC chip. A junction structure of the IC module comprises the IC module, an electronic component, and an electrically conductive bonding compound to couple the IC module to the electronic component. The film substrate is provided with an opening. The plurality of wiring leads are arranged on the film substrate in a manner that some respective portions of the wiring leads bridge the opening provided in the film substrate, the electrically insulative plastic coats the some respective portions of the wiring leads which bridge the opening, and the IC chip is coupled to the wiring leads. The IC module is folded at a part where the some respective portions of the wiring leads bridge the opening.