Patent ID: 8038329
Filing Date: 2011-10-18
Classification: F21K,F21S,F21V,F21Y

Abstract:
1. A bulb-type lamp comprising: a light emitting module including a substrate on which at least one light emitting element is mounted; a cylindrically-shaped heat sink that allows dissipation of heat therefrom, the heat being generated by the at least one light emitting element emitting light; a base member attached to one end portion of the heat sink; a plate-shaped heat conduction member on a front surface of which the light emitting module is mounted, the heat conduction member closing an opening of the other end portion of the heat sink and allowing conduction of the heat therefrom to the heat sink; a circuit that, upon receiving power via the base member, causes the at least one light emitting element to emit the light; and a circuit holder member positioned inside the heat sink, with the circuit disposed inside the circuit holder member, wherein an air space exists (i) between the circuit holder member and the heat sink, and/or (ii) between the circuit holder member and the heat conduction member, and the circuit is isolated from the air space by the circuit holder member, a side surface of the heat conduction member and an inner circumferential surface of the heat sink are in contact with each other, and a fraction S