Patent ID: 7280749
Filing Date: 2007-10-09
Classification: H05B

Abstract:
1. A radiation source comprising: a base; a curved reflector extending along an axis and attached to the base; at least two pins passing through the base, within the reflector, and along the axis of the reflector; and a filament helically wound about the pins such that the pins are located between the filament and the axis of the reflector, the filament having a high emissivity outwardly facing surface and a low emissivity inwardly facing surface, wherein the outwardly facing surface is parallel to the axis, and opposing ends electrically connected to a respective one of the pins so that upon passage of electrical energy through the filament, the filament becomes electrically heated and emits infrared radiation, wherein the helically wound filament has a diameter that monotonically decreases along the axis and away from the base and a width of the filament is greater than a space between adjacent coils of the helically wound filament, and wherein the helically wound filament forms at least two coils and at least one of the coils is offset from the axis.