Patent ID: 8279542
Filing Date: 2012-10-02
Classification: G02B

Abstract:
1. An optical device, comprising: a first capillary tube assembly and a second capillary tube assembly each including a capillary tube into which a respective optical fiber is inserted and fixed, each of the capillary tubes being retained by a respective retaining member; and a lens assembly which includes each of the retaining members for retaining the first capillary tube assembly and the second capillary tube assembly is fixed to a respective end surface of the accommodation member; each of the first lens and the second lens includes a spherical portion and a flat surface portion but does not include a columnar portion, and has a center of curvature of the spherical portion inside the spherical portion, the flat surface portion of each lens being provided under a state of opposing the leading end of the respective one of the optical fibers so as to be inclined with respect to an optical axis of the respective one of the optical fibers; the center of curvature of the spherical portion of each lens is offset, in a direction along a straight line, which forms a right angle with the optical axis of the respective optical fiber, and which makes an inclined angle with respect to a flat surface portion maximum, from the optical axis of the respective optical fiber to a passing area side of a main light beam of input/output light with respect to the leading end of the respective optical fiber; and a center axis of at least one of the retaining members is decentered with respect to a center axis of an inner periphery of the accommodation member in correspondence with the offset of the center of curvature of each of the spherical portions.