Tape Drive Head Assembly Suspension System for Sealed Cassette

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Solution Overview

Problem

Current tape drive systems face challenges with environmental reliability due to exposure to humidity and temperature variations, contamination, and limited accuracy at higher tracks per inch, requiring costly maintenance and compatibility issues with multiple tape generations.

Innovation Solution

A tape embedded drive that integrates the tape media and read/write heads within a sealed cassette using a standardized 3.5 inch form factor, similar to hard disk drives, incorporating a system-on-a-chip and motor drivers to simplify infrastructure and maintenance, and employing a multi-stage actuator for precise head movement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If tape drive systems are exposed to environmental conditions for operation, then they can perform reading and writing functions, but they suffer from humidity and temperature variations, contamination, requiring costly maintenance

Engineering Contradiction:

Improveenvironmental reliabilityVSAvoidhumidity, temperature variations, contamination

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The system is divided into separate functional modules: a sealed cartridge containing the tape media and a separate drive mechanism. The cartridge can be removed and replaced without exposing the tape to environmental factors, while the drive remains stationary and environmentally protected.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The tape cartridge is designed as a disposable or replaceable unit that can be sealed and stored independently. Once contaminated or worn, the entire cartridge can be replaced rather than requiring maintenance of individual components, reducing overall system maintenance costs.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Measurement precision

If tape drive systems use traditional designs, then they can store data, but they have limited accuracy at higher tracks per inch

Engineering Contradiction:

Improvetracking accuracyVSAvoiddata recording accuracy at higher tracks per inch

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The system replaces mechanical tracking mechanisms with a combination of precision motors and electronic control systems. The first motor rotates the spool while the second motor precisely positions the read/write head, allowing for accurate tracking at higher tracks per inch without relying solely on mechanical tolerances.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Adaptability or versatility

If tape drive systems use separate components for tape storage and read/write mechanisms, then they can function independently, but they require costly maintenance and have compatibility issues with multiple tape generations

Engineering Contradiction:

Improvecompatibility with multiple tape generationsVSAvoidmaintenance cost and complexity

Core Design Contradiction:

Adaptability or versatilityVSEase of repair

Solution Approach 1:

The read/write mechanisms and control electronics are integrated into the drive unit, while the tape media is contained in separate standardized cartridges. This merging of critical components into a single drive unit improves reliability and reduces compatibility issues across different tape generations.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The drive unit is designed with universal interfaces and control systems that can accommodate multiple tape cartridge formats and generations. The standardized mounting and electrical connections allow the same drive to work with different tape types without requiring separate maintenance or calibration procedures.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This solution enhances reliability by protecting the tape media and heads from environmental factors, reduces maintenance costs, and improves data access times by integrating the head assembly and tape reels within a sealed unit, allowing for more precise data recording and reading.

Implementation Method 1

a voice coil motor to move the head bar across the width of the tape media

Methodology Applied

Scientific EffectVoice coil motor: Lorentz Force

Implementation Method 2

a piezoelectric actuator to move the head bar in fine increments

Methodology Applied

Scientific EffectPiezoelectric actuator: Piezoelectric Effect

Implementation Method 3

a stepping motor to move the head bar to specific positions

Methodology Applied

Scientific EffectStepping motor:

Data Source

PatentUS11393498B2Head assembly with suspension system for a tape embedded drive

Publication Date: 2022.07.19 WESTERN DIGITAL TECHNOLOGIES INC

AI summary

A storage device comprises tape reel(s) holding tape media for storing data, a head assembly, motor(s) configured to actuate the head assembly, a sealed casing, and a printed circuit board assembly (PCBA) configured to control operations of the motor(s). The head assembly comprises a support structure, a head bar with read head(s) and write head(s), and a suspension system connecting the head bar to the support structure. The sealed casing encloses in its interior the tape reel(s), the head assembly, and the motor(s). Meanwhile, the PCBA is mounted on an external surface of the casing.