Patent ID: 7889622

Claim:
An optical head for recording and/or reproducing a signal on an optical recording medium, the optical head comprising: a light source that emits light of less than or equal to 450 nm wavelength; an objective lens that condenses light emitted from said light source onto the optical recording medium; and a light separator that is disposed between said light source and said objective lens on a light path of the emitted light and separates the emitted light from reflected light which is emitted from said light source and reflected by the optical recording medium, wherein said light separator includes: a first glass; a multilayer film that is formed on said first glass; an adhesive layer that is arranged on said multilayer film; a second glass that is fixed on said multilayer film by an adhesive bonding provided by said adhesive layer; the emitted light emitted from said light source enters and transmits through said first glass and transmits through said first glass again after a total reflection on said multilayer film and then transmits through said light separator; and the reflected light reflected by the optical recording medium enters said light separator from a side of said first glass and transmits through said light separator in an order from said first glass, said multilayer film, said adhesive layer, to said second glass.