Converging mirror furnace

A converging mirror-based furnace for heating a target by causing light emitted from a light source to be reflected by a reflecting mirror unit to irradiate the target,

• wherein at least one reflecting mirror unit with a light source installed inside is provided;
• the reflecting mirror unit is formed by combining a primary reflecting mirror being spheroidal mirror whose reflecting surface is constituted by the interior surface of a spheroid having a full-circle cross section, with a secondary reflecting mirror being an entirely revolving paraboloidal mirror whose reflecting surface is constituted by the interior surface of a revolving paraboloidal mirror;
• the light source is installed in the primary reflecting mirror wherein the light source is positioned at one of two focal points on the primary reflecting mirror, while an opening provided in the primary reflecting mirror is inter-connected with an opening provided in the secondary reflecting mirror wherein the other focal point of the primary reflecting mirror is positioned at a focal point of the secondary reflecting mirror, and a converging mirror unit is provided wherein a rotational axis of the revolving paraboloidal mirror constituting the secondary reflecting mirror and a center point of a surface-to-be-heated of the target placed in the furnace are positioned along one straight line, with the opening in the secondary reflecting mirror facing the target so that the light is irradiated onto the surface-to-be-heated, said light source being entirely surrounded by the primary reflecting mirror except for the opening of the primary reflecting mirror as viewed from the opening;
• and
• the rotational axis of the secondary reflecting mirror is not perpendicular to the surface of the target.

A converging mirror-based furnace for heating a target by causing light emitted from a light source to be reflected by a reflecting mirror unit to irradiate the target,

• wherein the reflecting mirror unit has a primary reflecting mirror whose reflecting surface is a part of the interior surface of a ring drawn by rotating around the normal line a closed curved line which is present on the same plane as the normal line passing through the center of the surface-to-be-heated and not intersecting with the normal line;
• a light source is installed in the ring that forms the primary reflecting mirror having a ring-shaped, in a manner being arranged over the ring either partially or entirely along the circumferential direction;
• the target is set on a plane perpendicular to the normal line but not intersecting with the ring, with a slit provided in the reflecting surface near the point of intersection between the shortest straight line connecting the center of the surface-to-be-heated and light source on one hand and the reflecting surface on the other, in order to irradiate the light onto the target;
• and
• the end of the primary reflecting surface where the slit is formed is connected to the reflecting surface that forms the secondary reflecting surface.