Light source device

A light source device including:

• two sets of one or more semiconductor light-emitting elements as a light source;
• a circuit unit driving the semiconductor light-emitting elements to emit light;
• and an envelope formed from an outer tube having two open ends and a pair of power connectors attached to each open end of the outer tube, the semiconductor light-emitting elements and the circuit unit being housed in the envelope, the light source device comprising:
• two light diffusers each having a reflective outer surface to diffuse incident light;
• and
• one or more supports, wherein
• the light diffusers are disposed along an axial direction of the outer tube and both at least partially in an axially central section of the outer tube,
• each set of one or more semiconductor light-emitting elements is disposed between one of the light diffusers and one of the power connectors that is closer to the light diffuser, and each semiconductor light-emitting element in the respective sets is oriented so that a main emission direction points toward the light diffuser,
• at least one component of the circuit unit is disposed between the two light diffusers, and
• the at least one component of the circuit unit and the light diffusers are held in place by being supported commonly or separately by the one or more supports.

A light source device including:

• two sets of one or more semiconductor light-emitting elements as a light source;
• a circuit unit driving the semiconductor light-emitting elements to emit light;
• and an envelope formed from an outer tube having two open ends and a pair of power connectors attached to each open end of the outer tube, the semiconductor light-emitting elements and the circuit unit being housed in the envelope, the light source device comprising:
• a light diffuser having a reflective outer surface to diffuse incident light;
• and
• a support, wherein
• at least one component of the circuit unit is disposed inside the light diffuser,
• the light diffuser is disposed at least partially in an axially central section of the outer tube,
• the sets of one or more semiconductor light-emitting elements are disposed along an axial direction of the outer tube to have the light diffuser therebetween, and each semiconductor light-emitting element in the respective sets is oriented so that a main emission direction points toward the light diffuser, and
• the light diffuser is held in place by being supported by the support.

A light source device including:

• a semiconductor light-emitting element as a light source;
• a circuit unit driving the semiconductor light-emitting element to emit light;
• and an envelope formed from an outer tube and a power connector, the semiconductor light-emitting element and the circuit unit being housed in the envelope, the light source device comprising:
• a light diffuser that is a block of a material containing a wavelength converting material, the light diffuser converting incident light into light of a different wavelength and radially diffusing light resulting from the wavelength conversion;
• and
• one or more supports, wherein
• the light diffuser is disposed at least partially in an axially central section of the outer tube,
• the semiconductor light-emitting element is disposed on a side of the light diffuser at which the power connector is located and in an orientation that a main emission direction points toward the light diffuser,
• at least one component of the circuit unit is disposed on the side of the light diffuser opposite the semiconductor light-emitting element, and
• the at least one component of the circuit unit and the light diffuser are held in place by being supported commonly or separately by the one or more supports.

A light source device including:

• two sets of one or more semiconductor light-emitting elements as a light source;
• a circuit unit driving the semiconductor light-emitting elements to emit light;
• and an envelope formed from an outer tube having two open ends and a pair of power connectors attached to each open end of the outer tube, the semiconductor light-emitting elements and the circuit unit being housed in the envelope, the light source device comprising:
• two light diffusers each of which is a block of a material containing a wavelength converting material, each light diffuser converting incident light into light of a different wavelength and radially diffusing light resulting from the wavelength conversion;
• and
• one or more supports, wherein
• the light diffusers are disposed along an axial direction of the tube and both in an axially central section of the outer tube,
• each set of one or more semiconductor light-emitting elements is disposed between one of the light diffusers and one of the power connectors that is closer to the light diffuser, and each semiconductor light-emitting element in the respective sets is oriented so that a main emission direction points toward the light diffuser,
• at least one component of the circuit unit is disposed between the two light diffusers, and
• the at least one component of the circuit unit and the light diffusers are held in place by being supported commonly or separately by the one or more supports.