OPTICAL COMPONENT, OPTICAL HEAD, AND OPTICAL HEAD DEVICE

PROBLEM TO BE SOLVED: To provide an optical component which, when used in an optical head device such as a laser machining device, prevents an optical path of light radiated to a machining target and an optical path of reflected light from being significantly changed, thereby requiring no enlarged optical element on the optical path, and needs no precise mechanism for adjusting an incidence angle of light on an optical axis of an object lens, and facilitates adjusting spot intervals on the target to set values, and to provide an optical head including the optical component, and an optical head device including the optical head, and furthermore, an optical head which prevents an increase in cost of a device even when a mechanism for automatically changing spot intervals is provided, and an optical head device including the optical head. SOLUTION: The optical component is formed by combining at least two prisms made of different materials. A refractive index of one material and that of the other are substantially equal to each other for light of a predetermined wavelength. A refractive index of one material and that of the other are different from each other for light of the other wavelengths. COPYRIGHT: (C)2011,JPO&INPIT