Position detection device, rotating body detection control device, rotating body trael device and image forming device

A rotating body travel device, including:

• a position detection device;
• a drive device which is configured to drive the rotating body;
• a thrust adjustment device which is configured to adjust a thrust direction intersecting with a rotating direction of the rotating body;
• and
• a control device which is configured to control the drive device and the thrust adjustment device according to a detection result by the position detection device,
• the position detection device comprising:
• a scale;
• and
• an image pickup device which is configured to capture a mark pattern of the scale formed with a consecutive mark pattern generated by a change in prescribed reflectivity or permeability,
• the mark pattern of the scale being formed with substantially identical mark patterns which are disposed in a main moving direction of the scale continuously, and the mark pattern being arranged such that a part of the mark pattern in a sub moving direction intersecting with the main moving direction is projected, when the mark pattern is projected on the image pickup device,
• the position detection device being configured to detect a moving position of the scale by capturing the mark pattern of the scale with the image pickup device.

An image forming device, including a position detection device comprising:

• a scale;
• and
• an image pickup device which is configured to capture a mark pattern of the scale formed with a consecutive mark pattern generated by a change in prescribed reflectivity or permeability,
• the mark pattern of the scale being formed with substantially identical mark patterns which are disposed in a main moving direction of the scale continuously, and the mark pattern being arranged such that a part of the mark pattern in a sub moving direction intersecting with the main moving direction is projected, when the mark pattern is projected on the image pickup device,
• the position detection device being configured to detect a moving position of the scale by capturing the mark pattern of the scale with the image pickup device.