Object of this invention is to provide a servo writer capable of automatically controlling record current amount supplied to a writing head for every kind of magnetic tape when writing a servo signal on many kinds of magnetic tapes. The servo writer for writing a servo signal on magnetic tape MT which is fed out from a feeding reel and taken-up by a take-up reel includes writing head H 1 that writes a servo signal on the magnetic tape MT, inspection head H 2 for reading the servo signal formed on the downstream side and written on the magnetic tape MT, servo signal inspection part 16 that inspects the servo signal read by the inspection head H 2, and current amount control part 17 that controls the amount of record current supplied to the writing head H 1 based on the inspection result in the servo signal inspection part 16.
1. A servo writer for writing a servo signal on a magnetic tape which is fed out from a feeding reel and taken-up by a take-up reel, the servo writer comprising:
a writing head that writes a servo signal on the magnetic tape;
an inspection head which is formed on the downstream side of the writing head and reads the servo signal written on the magnetic tape for inspection;
a servo signal inspection part that inspects the servo signal read by the inspection head; and
a current amount control part that controls an amount of a record current supplied to the writing head based on the inspection result in the servo inspection part;
wherein based on a value obtained by moving average processing of the output of the servo signal read by the inspection head, the existence of the writing error of the servo signal written on the magnetic tape is inspected, and
wherein the servo signal read by the inspection head and a reference servo signal are compared, to thereby inspect the existence of a writing error of the servo signal written on the magnetic tape.
2. A servo writer as described in claim 1 , comprising a tape tension control part that adjusts the tension of the magnetic tape, and a tape run control part that controls rotation of the servo motor.
3. A servo writer as described in claim 1 , wherein a servo signal is formed by patterns which are inclined at a predetermined angle to the run direction of the magnetic tape.
4. The servo writer of claim 1 , wherein the moving average processing comprises an average of outputs of multiple servo signals recorded to the tape.
5. The servo writer of claim 1 , wherein the current amount control part automatically adjusts the record current to the writing head for different magnetic tapes.
6. A method for writing a servo signal that is fed out from a feeding reel and writes the servo signal on a 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 a record current supplied to the writing head based on the inspection result by the inspection step;
wherein based on a value obtained by moving average processing of the output of the servo signal read by the inspection head, the existence of the writing error of the servo signal written on the magnetic tape is inspected, and
wherein the servo signal read by the reading step and the reference servo signal are compared, to thereby the existence of the writing error of the servo signal written on the magnetic tape is inspected.
7. A method for writing a servo signal by the servo writer as described in claim 6 , further comprising adjusting the tension of the magnetic tape and controlling rotation of the servo motor.
8. A method for writing a servo signal by the servo writer as described in claim 6 , wherein a servo signal is formed by patterns which are inclined at a predetermined angle to the run direction of the magnetic tape.