Patent ID: 8064296

Claim:
An optical head, comprising: a first light source for emitting a first laser beam having a first wavelength shorter than 430 nm; a second light source for emitting a second laser beam having a second wavelength equal to or longer than 430 nm; a first light reflecting member in the form of a single plate for reflecting the first laser beam emitted from the first light source; a second light reflecting member in the form of a single plate for reflecting the first laser beam reflected by the first light reflecting member and transmitting the second laser beam emitted from the second light source; and an objective lens for focusing the first laser beam reflected by the second light reflecting member on an information recording surface of a first information recording medium, wherein an incident angle θ 1 of a chief ray of the first laser beam incident on the first light reflecting member satisfies π/4<θ1<Arctan(n2/n1) [rad] and an incident angle θ2 of the chief ray of the first laser beam incident on the second light reflecting member satisfies π/4>θ2 [rad] when n1 and n2 denote a refractive index of air and a refractive index of a material of the first light reflecting member at the first wavelength.