Patent ID: 7400568
Filing Date: 2008-07-15
Classification: G11B,H01L

Abstract:
1. An optical device comprising two light emitting elements each having an optical axis and being mounted on a surface of a substrate, the optical axes of the two light emitting elements being arranged perpendicular to each other and intersecting each other, and at least one prism having at least one of a reflection and transmission surface mounted on another surface of the substrate so that the at least one of the reflection and transmission surface forms an angle of 45 degrees with respect to the optical axes at the intersection thereof, a thickness of the another surface of the substrate on which the at least one prism is mounted being thinner than a thickness of the surface of the substrate on which the two light emitting elements are mounted, and among circumferences of the another surface of the substrate on which the at least one prism is mounted, circumferences of the another surface of the substrate which are opposite to the two light emitting elements are open, wherein the at least one prism has two of the at least one of reflection and transmission surfaces mounted at different positions on the another surface of the substrate so that the reflection and transmission surfaces form an angle of 45° with respect to the optical axes at the intersection thereof.