Patent ID: 8488431

Claim:
An optical head which records or reproduces information to or from an information recording medium having a recording layer, comprising: a light source which emits a luminous flux; an objective lens which focuses the luminous flux emitted from the light source on the information recording medium; and a photodetector which detects the luminous flux reflected by the information recording medium, wherein the photodetector includes: a light receiving part which receives the luminous flux reflected by the information recording medium; a package member which covers the light receiving part; and an adhesion layer which bonds the package member and the light receiving part, and wherein the adhesion layer is formed in a region that is on the light receiving part and includes a light path through which the luminous flux reflected by the information recording medium passes, the adhesion layer is made of silicon resin, and the thickness of the adhesion layer is between 5 μm and 25 μm.