Servo signal verifying device for magnetic recording tape, servo writer, method of producing magnetic recording tape, and servo signal reading head

A servo signal verifying device, comprising:

• at least one servo signal reading head that reads a servo signal written to a servo band of a magnetic recording tape;
• a first amplifier that amplifies the servo signal read by the servo signal reading head;
• and
• a second amplifier that includes a low-pass filter with a cutoff frequency of 35 MHz or less and amplifies a signal amplified by the first amplifier, wherein
• a length of a wiring connecting the first amplifier and the servo signal reading head to each other is 10 cm or less.

A servo signal verifying device, comprising:

• at least one servo signal reading head that reads a servo signal written to a servo band of a magnetic recording tape;
• a first amplifier that amplifies the servo signal read by the servo signal reading head;
• and
• a second amplifier that includes a low-pass filter with a cutoff frequency of 35 MHz or less and amplifies a signal amplified by the first amplifier, wherein
• a track width of the servo band is 150 μm or less.

A servo signal verifying device, comprising:

• at least one servo signal reading head that reads a servo signal written to a servo band of a magnetic recording tape;
• a first amplifier that amplifies the servo signal read by the servo signal reading head;
• and
• a second amplifier that includes a low-pass filter with a cutoff frequency of 35 MHz or less and amplifies a signal amplified by the first amplifier, wherein
• of the gap of the servo signal reading head, a gap width of a center region is wider than gap widths of both end portions.

A servo signal verifying device, comprising:

• at least one servo signal reading head that reads a servo signal written to a servo band of a magnetic recording tape;
• a first amplifier that amplifies the servo signal read by the servo signal reading head;
• and
• a second amplifier that includes a low-pass filter with a cutoff frequency of 35 MHz or less and amplifies a signal amplified by the first amplifier,
• wherein
• the magnetic recording tape includes a magnetic layer containing barium ferrite, and
• wherein
• the servo signal reading head reads a servo signal on a basis of magnetic flux changes in gap portions of both the end portions.

A servo writer, comprising:

• a servo signal verifying device including
• at least one servo signal reading head that reads a servo signal written to a servo band of a magnetic recording tape,
• a first amplifier that amplifies the servo signal read by the servo signal reading head, and
• a second amplifier that includes a low-pass filter with a cutoff frequency of 35 MHz or less and amplifies a signal amplified by the first amplifier, and
• wherein the servo writer further includes any one of the following:
• wherein a depth of a gap of the servo signal reading head is 40 μm or less,
• wherein a length of a wiring connecting the first amplifier and the servo signal reading head to each other is 10 cm or less,
• wherein a track width of the servo band is 150 μm or less,
• wherein of the gap of the servo signal reading head, a gap width of a center region is wider than gap widths of both end portions, and
• wherein the servo signal reading head reads a servo signal on a basis of magnetic flux changes in gap portions of both the end portions and the magnetic recording tape includes a magnetic layer containing barium ferrite.

A method of producing a magnetic recording tape on which a servo signal is recorded, comprising:

• a recording step of recording the servo signal on the magnetic recording tape;
• and
• a verification step of verifying the servo signal recorded in the recording step, wherein
• the verification step is executed by using a servo signal verifying device including
• at least one servo signal reading head that reads a servo signal written to a servo band of the magnetic recording tape,
• a first amplifier that amplifies the servo signal read by the servo signal reading head, and
• a second amplifier that includes a low-pass filter with a cutoff frequency of 35 MHz or less and amplifies a signal amplified by the first amplifier, and
• wherein the method further includes any one of the following:
• wherein a depth of a gap of the servo signal reading head is 40 μm or less,
• wherein a length of a wiring connecting the first amplifier and the servo signal reading head to each other is 10 cm or less,
• wherein a track width of the servo band is 150 μm or less,
• wherein of the gap of the servo signal reading head, a gap width of a center region is wider than gap widths of both end portions, and
• wherein the servo signal reading head reads a servo signal on a basis of magnetic flux changes in gap portions of both the end portions and the magnetic recording tape includes a magnetic layer containing barium ferrite.