I/We Claim:
1. An inspection device of an optical fiber unit in which a plurality of binding
materials are wound in an SZ shape on a plurality of optical fibers, the device
comprising:
a measurement unit that is configured to measure a width of the optical fiber units in a first direction orthogonal to a longitudinal direction in which the optical fiber unit extends; and
a determination unit that is configured to determine presence or absence of an abnormality in a binding state, based on a measurement result of the measurement unit.
2. The inspection device of an optical fiber unit according to claim 1, further
comprising:
a bending portion that is configured to bend the optical fiber unit, wherein the bending portion includes
an upper-side pressing portion disposed above the optical fiber unit, and a lower-side pressing portion disposed below the optical fiber unit, wherein the upper-side pressing portion and the lower-side pressing portion are disposed at different positions in the longitudinal direction, and
wherein a distance between the upper-side pressing portion and the lower-side pressing portion in a second direction orthogonal to both the longitudinal direction and the first direction is smaller than a width of the optical fiber unit in the second direction.
3. The inspection device of an optical fiber unit according to claim 2,
wherein a shortest distance between the upper-side pressing portion and the

lower-side pressing portion is larger than an outer diameter of the optical fiber unit.
4. The inspection device of an optical fiber unit according to claim 2 or 3,
wherein the bending portions are disposed on both sides interposing the
measurement unit therebetween in the longitudinal direction, respectively.
5. The inspection device of an optical fiber unit according to any one of claims
1 to 4,
wherein the measurement unit is further configured to measure a width of the optical fiber unit in the second direction orthogonal to both the longitudinal direction and the first direction.
6. The inspection device of an optical fiber unit according to any one of claims
1 to 5,
wherein the measurement unit is further configured to measure a position of the optical fiber unit in the longitudinal direction.
7. A method of manufacturing an optical fiber unit, the method comprising:
a binding step of forming an optical fiber unit in which a plurality of binding
materials are wound in an SZ shape on a plurality of optical fibers,
a measurement step of measuring a width of the optical fiber units in a first
direction orthogonal to a longitudinal direction in which the optical fiber unit extends;
and
a determination step of determining presence or absence of an abnormality in a
binding state of the optical fiber unit, based on a measurement result in the measurement

step.
8. The method of manufacturing an optical fiber unit according to claim 7,
further comprising:
a bending step of bending the optical fiber unit.
9. The method of manufacturing an optical fiber unit according to claim 7 or 8,
wherein in the determination step, presence or absence of an abnormality in a
binding state of the optical fiber unit is determined for each binding pitch of the binding material.
10. The method of manufacturing an optical fiber unit according to any one of
claims 7 to 9,
wherein in the determination step, of the optical fiber unit, a length in the longitudinal direction of a portion where the width of the optical fiber unit in the first direction exceeds an upper limit value is compared with a predetermined threshold value.
11. The method of manufacturing an optical fiber unit according to any one of
claims 7 to 10, further comprising:
an average value calculation step of calculating an average value of the width of the optical fiber unit in the first direction,
wherein in the determination step, the width of the optical fiber unit in the first direction is compared with the average value.
12. The method of manufacturing an optical fiber unit according to any one of

claims 7 to 11,
wherein in the measurement step, a position of the optical fiber unit in the longitudinal direction is further measured.