Servo writer

A method for writing a servo signal that is fed out from a feeding reel and writes the servo signal on the magnetic tape taken up on a take-up reel, comprising the steps of:

• writing the servo signal on the magnetic tape by a writing head;
• reading a servo signal written on the magnetic tape for inspection by an inspection head;
• inspecting the servo signal read by the reading step;
• and
• controlling an amount of record current supplied to the writing head based on the inspection result by the inspection step.

A servo writer for writing a servo signal on a magnetic tape fed out from a feeding reel and taken up on a take-up reel, comprising:

• a tape tension control part that adjusts a tension of the magnetic tape;
• a tape run control part that controls rotation of a servo motor;
• a writing head that writes the servo signal on the magnetic tape, in a state of a predetermined inclination to the run direction of the magnetic;
• an inspection head that reads the servo signal written on the magnetic tape;
• a servo signal inspection part that inspects the existence of the writing error of the servo signal written on the magnetic tape based on the value obtained by moving average processing of the output of the servo signal read by the inspection head;
• and
• a current control part that controls an amount of record current supplied to the writing head based on the inspection result by the servo signal inspection part.