Light beam heating apparatus

Abstract

A light beam heating apparatus having a condensing lens mechanism including an aspherical lens and a spherical lens disposed in a light path. The light beam heating apparatus also includes a light source and a light path which transmits the light beam irradiated from the light source, to an object to be heated. The light beam is transmitted through an optical fiber along part the light path, and the aspherical lens and spherical lens are disposed on the optical fiber side and on the object-to-be-heated side respectively. The above-described construction functions to suppress lateral aberration when the diameter of an optical fiber in use is changed, thereby preventing deterioration of the imaging capacity. Also, the occurrence of chromatic aberration can be suppressed to a minimum. Thus, energy concentration in the light condensing section can be improved.

Dependencies are inferred from the claim text.