Patent ID: 7289737
Filing Date: 2007-10-30
Classification: G02B,H04B

Abstract:
1. A communication optical system comprising: a light source; a light-receiving element; a first and a second prisms, which are cemented to each other; and a beam-splitting member, which performs reflection towards an incident and emergent port, of a first light beam from the light source, and performs transmission towards the light-receiving element, of a second light beam from the incident and emergent port, wherein the beam-splitting member is arranged at a cemented portion of the first and second prisms, and the light source and the light-receiving element are arranged on the same side with respect to the first and second prisms; wherein the second prism comprises a first surface cemented to the first prism, a second surface which is parallel to the first surface and a third surface disposed on the opposite side of the first surface with respect to the light source; wherein the third surface is arranged non-perpendicularly to an optical axis of the first light beam extending from the light source to the beam-splitting member, and is arranged so as to intersect with an extended line of the optical axis of the first light beam extending from the light source to the beam-splitting member; and wherein the third surface is arranged such that the third surface forms an angle of 90° with respect to both the first surface and the second surface of the second prism.