Patent ID: 8243575

Claim:
An optical head, comprising: a light source, which is configured to emit a light beam therefrom; an optical branch element, which is configured to penetrate a predetermined amount of lights, therethrough, of an incident light beam thereon, and to reflecting remaining amount of lights thereupon; a light focusing element, which is configured to focus said light beam upon an optical information recording medium; a photo detector, which is configured to receive said light beam reflecting upon said optical information recording medium; and an optical path converter element, which is configured to convert an angle of an optical path, on which said light beam propagates; wherein said optical path converter element is disposed on an optical path of said light beam between said optical branch element and said photo detector, or between said optical branch element and said light source, and has an incident surface, upon which said light beam enters, and an emission surface, from which said light beams emits, so that said light beam reflects at least two (2) times within said optical path converter element, during time when passing through between said incident surface and said emission surface; and said optical path converter element is so constructed that an angle defined by said incident surface and the emission surface is smaller than 45 degree.