RFID Tag Servo Signal Linearity Correction for Magnetic Tape Head Positioning

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Solution Overview

Problem

The existing technologies for data recording and reproducing systems using magnetic tapes face challenges in accurately positioning the data recording and reproducing head due to non-linear formation of servo signals on the magnetic tape, which affects the accuracy of positioning and data retrieval.

Innovation Solution

A recording device and system that records and reads information on the linearity of servo signals on a magnetic tape, using an RFID tag or magnetic tape as a recording medium, to accurately position the data recording and reproducing head by recording and reading information on the linearity of the servo signal, allowing for precise positioning through a calculation equation approximation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a servo signal is recorded on a magnetic tape, then positioning information is provided for head alignment, but the servo signal may not be linearly formed causing positioning inaccuracies

Engineering Contradiction:

Improvepositioning accuracyVSAvoidservo signal linearity

Core Design Contradiction:

Measurement precisionVSManufacturing precision

Solution Approach 1:

The patent records linearity correction information on the magnetic tape before data recording. This preliminary action allows the system to pre-compensate for servo signal non-linearity, enabling accurate head positioning even when the servo signal is not perfectly linear. The correction information is stored in advance and applied during the positioning process.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent creates a correction map or lookup table that stores the relationship between physical head position and servo signal position. This copied information represents the non-linear relationship and allows the system to translate servo signal readings into accurate positional information by referencing the pre-recorded correction data.

Inventive Principle:

Principle #26Copying

2Measurement precision

If linearity correction information is recorded on the magnetic tape, then positioning accuracy is improved, but the recording medium requires additional information storage

Engineering Contradiction:

Improvehead positioning accuracyVSAvoidinformation storage capacity

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent applies partial correction by recording linearity information only at specific reference positions or intervals on the magnetic tape, rather than continuously throughout the entire tape. This approach provides sufficient positioning accuracy for practical purposes while minimizing the additional information storage required.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent changes the representation of positioning information by encoding linearity correction data in a compact format, such as using differential encoding or storing only deviation values from a reference linear trajectory. This reduces the storage space required while maintaining positioning accuracy.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11183208B2Recording device, control device, recording method, recording tape cartridge, and data recording and reproducing system

Publication Date: 2021.11.23 FUJIFILM CORP

AI summary

A recording device, a control device, a recording method, a recording tape cartridge, and a data recording and reproducing system capable of accurately positioning a data recording and reproducing head are obtained. A recording device includes a recording unit that records information on linearity of a servo signal recorded on a magnetic tape included in a recording tape cartridge on an RFID tag included in the recording tape cartridge.