Patent ID: 8337049

Claim:
A bulb-type lighting source that receives electric power supplied via a base, comprising: a bowl-shaped case which accommodates a power supply circuit in an inner space thereof and to which the base is attached; a first heat sink member that closes a mouth of the bowl-shaped case; a mounting substrate that is in surface contact with a front surface of the first heat sink member opposite a rear surface of the first heat sink member that faces the inner space of the bowl-shaped case; a light-emitting unit that is mounted on a front surface of the mounting substrate opposite a rear surface of the mounting substrate which is in surface contact with the first heat sink member and that includes (i) a light-emitting element that emits light upon receiving electric power supplied by the power supply circuit and (ii) a wavelength conversion element that converts wavelengths of the light emitted by the light-emitting element; a globe that at least covers the light-emitting unit in light emission directions thereof; and a second heat sink member that has a first part in surface contact with a region of the front surface of the mounting substrate where the light-emitting unit is not mounted and that has a second part in surface contact with the first heat sink member, wherein the first part of the second heat sink member is in: (i) surface contact with a perimeter region of the front surface of the mounting substrate in entirety, (ii) surface contact with the perimeter region of the front surface of the mounting substrate excluding a region where electrode pads are placed, or (iii) if the mounting substrate is a quadrilateral when viewed from an angle perpendicular to the mounting substrate, surface contact with three sides of the perimeter region of the front surface of the mounting substrate.