Device for mounting a light source

A device for mounting a light source comprising:

• an electric lamp unit composed of a baseless electric lamp and a base member,
• a mounting unit having a cavity for receiving the base member of the electric lamp unit, and
• a printed circuit board having a pair of connection terminals connected to a printed circuit formed on said printed circuit board;
• wherein
• said baseless electric lamp comprises a light emission filament, a pair of lead wires for supporting the both ends of the filament at their heads and a glass bulb in which the light emission filament and a part of the lead wires are sealed,
• said base member comprises a cylindrical body having a cavity for receiving a lower part of said baseless electric lamp and supporting said pair of lead wires led out the baseless electric lamp on its outer surface,
• said mounting unit comprises a pair of conductive contact members on an inner surface of said cavity, which are connected to said connection terminals on said printed circuit board at their lower ends,
• said lead wires led out of said baseless electric lamp along said outer surface of said base member are made in a sliding contact with said conductive contact members when said electric lamp unit is fitted into said mounting unit, and
• said electric lamp unit is fitted into said mounting unit in a removable fashion.

A method for mounting a light source device on a circuit board having connection terminals for mounting said light source device on at least one main surface of the circuit board, comprising:

• a step for fixing a mounting unit on said connection terminals, and
• a step for mounting an electric lamp unit composed of a baseless electric lamp and a base member on said mounting unit, wherein;
• said mounting unit has a cavity for receiving the base member of the electric lamp unit,
• said baseless electric lamp comprises a light emission filament, a pair of lead wires for supporting the both ends of the filament at their heads and a glass bulb in which the light emission filament and a part of the lead wires are sealed,
• said base member comprises a cylindrical body having a cavity for receiving a lower part of said baseless electric lamp and supporting said pair of lead wires led out of the baseless electric lamp on its outer surface,
• said mounting unit includes a pair of conductive contact members on an inner surface of said cavity, which are connected to connection terminals on a printed circuit board at their lower ends.

A method for mounting a light source device on a circuit board having connection terminals for mounting said light source device on at least one main surface of the circuit board, comprising:

• a step for mounting an electric lamp unit on a mounting unit, and
• a step for fixing a mounting unit on said connection terminals, wherein;
• said mounting unit having a cavity for receiving the base member of the electric lamp unit
• said baseless electric lamp comprises a light emission filament, a pair of lead wires for supporting the both ends of the filament at their heads and a glass bulb in which the light emission filament and a part of the lead wires are sealed,
• said base member comprises a cylindrical body having a cavity for receiving a lower part of said baseless electric lamp and supporting said pair of lead wires led out of the baseless electric lamp on its outer surface,
• said mounting unit includes a pair of conductive contact members on an inner surface of said cavity, which are connected to connection terminals on a printed circuit board at their lower ends.