Patent ID: 6914870

Claim:
An optical head apparatus, comprising: a semiconductor laser light source; a photodetector that receives at least one part of light from said semiconductor laser light source; a light reflection element provided with a peripheral section that reflects peripheral light of the light from said semiconductor laser light source and condenses it into said photodetector and a central section that transmits central light of the light from said semiconductor laser light source; and a condenser lens that condenses the light that passes through said light reflection element onto an optical disc, wherein: each surface of the central section of said light reflection element has a flat shape; and at least one surface of the peripheral section of said light reflection element has a spherical or non-spherical curved shape, the spherical or non-spherical curved shape; forming a surface of rotation about the central section of the light reflecting element; and having a cross-sectional shape in a plane perpendicular to a front surface of the central section of said light reflection element which includes two sections of a single curve with zero inflection points.