Patent ID: 8050167
Filing Date: 2011-11-01
Classification: G11B

Abstract:
1. An optical device comprising: a wiring substrate; a sub-mount where an onboard part for mounting a semiconductor laser thereon and an optical-path conversion mirror for reflecting laser light emitted from the semiconductor laser are integrated with each other, the sub-mount being arranged on the wiring substrate; a light receiving element substrate arranged on the wiring substrate; and a light receiving element arranged on the light receiving element substrate and divided into a plurality of light receiving regions by a first parting line substantially parallel to a tangential line of a recording track of an optical disc projected on the light receiving element substrate and a second parting line perpendicular to the first parting line, wherein the sub-mount is arranged on the wiring substrate so that a longitudinal axis of the sub-mount is inclined to the tangential line of the recording track in view from an upside of the optical device, whereby at least one of: is substantially neither parallel nor perpendicular to the first parting line and the second parting line, thereby making an predetermined angle to the first parting line.