Method of manufacturing rotary scale, rotary scale, rotary encoder, driving apparatus, image pickup apparatus and robot apparatus

A method of manufacturing a rotary scale to be fixed to a rotating shaft of a rotating member, the method comprising:

• a first step of forming, on a scale substrate, a scale pattern and a mark indicating an outer shape of the rotating shaft positioned such that a center axis of the rotating shaft coincides with a center axis of the scale pattern;
• a second step of cutting a first area within the scale substrate, the first area including mark portions of the mark excluding at least three mark portions;
• and a third step of cutting a second area, the second area including the at least three mark portions that remain after the cutting of the first area, having a length in a circumferential direction of the scale substrate shorter than that in the first area and having a second width narrower than a first width of the first area;
• wherein the first step forms a second mark having an enlarged shape of the mark and a third mark having a reduced shape of the mark;
• wherein the second step cuts the first area including at least one of the second mark and the third mark excluding, the at least three mark portions, and wherein the third step cuts the second area provided between the second mark and the third mark.