Bearing component, bearing, machine, vehicle, individual identification method for bearing component, manufacturing method for bearing, manufacturing method for machine, and manufacturing method for vehicle

A method for reading a two-dimensional code included in a bearing component which is an annular member with the two-dimensional code which has a shape with a maximum circumferential dimension longer than a maximum radial dimensional, wherein the two dimensional code is provided on a flat part of the annular member, and at least one dot row among a plurality of dot rows arranged in a longitudinal direction of the two-dimensional code has a line pattern in which all dots are marked, the method comprising the steps of:

• first, imaging the bearing component;
• second, detecting a circumferential position of the bearing component in which the two-dimensional code is arranged from a captured image of the bearing component;
• third, capturing the circumferential position of the bearing component and acquiring a captured image of the two-dimensional code;
• and
• fourth, reading information of the two-dimensional code from the captured image of the two-dimensional code, wherein
• in the first step, the imaging optical system for imaging the bearing component is moved to image a plurality of different locations in a circumferential direction of the bearing component, and
• in the second step, the circumferential position of the two-dimensional code is detected from one of the captured images in a captured image group obtained by imaging the plurality of locations.

A method for reading a two-dimensional code included in a bearing component which is an annular member with the two-dimensional code which has a shape with a maximum circumferential dimension longer than a maximum radial dimensional, wherein the two dimensional code is provided on a flat part of the annular member, and at least one dot row among a plurality of dot rows arranged in a longitudinal direction of the two-dimensional code has a line pattern in which all dots are marked, the method comprising the steps of:

• first, imaging the bearing component;
• second, detecting a circumferential position of the bearing component in which the two-dimensional code is arranged from a captured image of the bearing component;
• third, capturing the circumferential position of the bearing component and acquiring a captured image of the two-dimensional code;
• and
• fourth, reading information of the two-dimensional code from the captured image of the two-dimensional code, wherein
• in the first step, a plurality of locations of the bearing component are imaged by a plurality of imaging optical system which respectively image a plurality of different locations in a circumferential direction of the stationary bearing component, and
• in the second step, the circumferential position of the two-dimensional code is detected from one of captured images in a captured image group obtained by imaging the plurality of locations.

A method for reading a two-dimensional code included in a bearing component which is an annular member with the two-dimensional code which has a shape with a maximum circumferential dimension longer than a maximum radial dimensional, wherein the two dimensional code is provided on a flat part of the annular member, and at least one dot row among a plurality of dot rows arranged in a longitudinal direction of the two-dimensional code has a line pattern in which all dots are marked, the method comprising:

• imaging the bearing component, and
• reading information of the two-dimensional code from the captured image of the bearing component, wherein
• a plurality of locations of the bearing component are imaged by a plurality of imaging optical system which image a plurality of different locations in the circumferential direction of the bearing component, and
• a circumferential position of the two-dimensional code is detected from one of captured images in a captured image group obtained by imaging the plurality of locations.

A method for reading a two-dimensional code included in a bearing component which is an annular member with the two-dimensional code which has a shape with a maximum circumferential dimension longer than a maximum radial dimensional or a maximum axial dimension, the method comprising the steps of:

• first, imaging the bearing component;
• second, detecting a circumferential position of the bearing component in which the two-dimensional code is arranged from a captured image of the bearing component;
• third, capturing the circumferential position of the bearing component and acquiring a captured image of the two-dimensional code;
• and
• fourth, reading information of the two-dimensional code from the captured image of the two-dimensional code,
• wherein, in the first step, the bearing component is rotated.