Abstract: A laser diode module of the invention can release heat radiated from a laser diode efficiently, and is of small size and small power consumption. An outer surface (15) of a bottom plate (2) of a package (7) is formed to be a board mounting surface to be mounted on a printed board (20). A base (6) is fixed to the inner wall surface (9) side of the top plate (8) of the package (7) and a laser diode (3) is fixed to the base (6). In the invention, an exemplary configuration where heat radiated from the laser diode is released effectively is formed by disposing a heat radiating unit (4) on the outer surface (16) side of the top plate (8) of the package (7), for example. The heat radiating unit (4) is formed by disposing a plurality of heat radiating fins (5) arranged at intervals, for example. The configuration containing the heat radiating unit (4) releases heat radiated from the laser diode (3) through the base (6), the top plate (8) and the heat radiating unit (4).

Abstract: A Mg alloy member with an anticorrosive coating free from any environmental load can be produced by using a solution for chemical conversion treatment for anticorrosive coating, which comprises 0.05 to 1 mol/l of an oxoacid compound of heavy metal selected from Mo, W and V and has a pH of 2 to 6 adjusted by sulfuric acid or nitric acid, and is characterized by contacting the surface of Mg alloy preferably containing 2 to 10% Al with the solution, thereby forming a specific oxide film and, if necessary further forming a fluorine-containing organic film on the film, the resulting Mg alloy member being used in electrically driven blowers, note-type personal computers, various household electrical appliances, etc.

Abstract: A Mg alloy member with an anticorrosive coating free from any enviromental load can be produced by using a solution for chemical conversion treatment for anticorrosive coating, which comprises 0.05 to 1 mol/l of an oxoacid compound of heavy metal selected from Mo, W and V and has a pH of 2 to 6 adjusted by sulfuric acid or nitric acid, and is characterized by contacting the surface of Mg alloy preferably containing 2 to 10% Al with the solution, thereby forming a specific oxide film and, if necessary further forming a fluorine-containing organic film on the film, the resulting Mg alloy member being used in electrically driven blowers, note-type personal computers, various household electrical appliances, etc.

Abstract: An insulating sheet having through holes formed therein at positions where circuit patterns formed on its both surfaces are electrically connected is prepared. A sheet for forming a hole bottom is attached to one surface of the insulating sheet. Subsequently, a first-layer circuit pattern is printed on the other surface of the insulating sheet to which the hole-bottom sheet is not attached, and a conductive paste is filled into the holes. Thereafter, the hole-bottom sheet is removed. Then, a second-layer circuit pattern is printed on the surface of the insulating sheet, from which the hole-bottom sheet is removed. With this process, a two-layer printed circuit sheet is manufactured.