US 12,468,096 B2
Optical device and method for manufacturing optical device
Atsushi Izawa, Tokyo (JP); Jun Miyokawa, Tokyo (JP); Maiko Ariga, Tokyo (JP); Kazuya Nagashima, Tokyo (JP); Yozo Ishikawa, Tokyo (JP); and Taketsugu Sawamura, Tokyo (JP)
Assigned to FURUKAWA ELECTRIC CO., LTD., Tokyo (JP)
Filed by FURUKAWA ELECTRIC CO., LTD., Tokyo (JP)
Filed on Jun. 21, 2022, as Appl. No. 17/808,007.
Application 17/808,007 is a continuation of application No. PCT/JP2020/049017, filed on Dec. 25, 2020.
Claims priority of application No. 2019-235084 (JP), filed on Dec. 25, 2019.
Prior Publication US 2022/0317392 A1, Oct. 6, 2022
Int. Cl. H04B 10/00 (2013.01); G02B 6/028 (2006.01); G02B 6/42 (2006.01)
CPC G02B 6/4204 (2013.01) [G02B 6/028 (2013.01); G02B 6/4213 (2013.01); G02B 6/4238 (2013.01); G02B 6/4243 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method for manufacturing an optical device including: a case;
a sleeve attached to the case, the sleeve including:
a cylindrical portion including a first through-hole penetrating between an inside and an outside of the case, and
a semi-cylindrical portion that is a support portion and protrudes from the cylindrical portion;
a first optical fiber including:
a core wire including a core and a clad, and
a sheath configured to surround the core wire, wherein an exposed portion of the core wire not surrounded by the sheath passes through the first through-hole; and
a joining material,
wherein the cylindrical portion includes an inclined surface inclined with respect to a penetrating direction of the first through-hole and having an opening of the first through hole,
the semi-cylindrical portion includes a flat top surface along the penetrating direction of the first through-hole, and the inclined surface and the top surface are smoothly connected to each other by a concave curved surface without a step,
the joining material includes a first joining material and a second joining material that are integrated with each other,
the first joining material directly surrounds an outer peripheral surface of the exposed portion without any material or coating of the exposed portion between the first joining material and the outer peripheral surface of the exposed portion, is disposed within the first through-hole interposed in a gap between the outer peripheral surface of the exposed portion and an inner peripheral surface of the first through-hole, and seals the gap,
the second joining material is disposed on the top surface and configured to join the outer peripheral surface of the exposed portion and the top surface in a state of directly surrounding the outer peripheral surface of the exposed portion without any material or coating of the exposed portion between the first joining material and the outer peripheral surface of the exposed portion,
the joining material as a whole is configured to join the sleeve and the first optical fiber, and
the semi-cylindrical portion is configured to support the exposed portion on the top surface via the second joining material, the method comprising:
causing the first joining material in a flowing state to enter between the outer peripheral surface of the exposed portion and the inner peripheral surface of the first through-hole, and causing the second joining material in a flowing state to enter between the outer peripheral surface and the top surface; and
solidifying the first joining material,
wherein the first joining material and the second joining material which are integrated with each other consist of a continuous volume of joining material of the same material composition, and
the joining material enters from the concave curved portion where the inclined surface and the top surface are smoothly connected to each other without a step.