Magnetic Tape Head Bonding Pad Layout for Higher Channel Density

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Solution Overview

Problem

Existing magnetic tape head modules face challenges in achieving a higher density of electrical connections without significant changes to their geometry and dimensions, and there is a need to minimize interference between wirebonds.

Innovation Solution

The use of multiple rows of bonding pads at different heights on both the magnetic tape head module and cable, with wirebonds positioned to avoid interference, allows for increased electrical connections and channel density without altering the module's geometry.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If multiple rows of bonding pads are used to increase electrical connections, then the channel density increases, but wirebond interference occurs

Engineering Contradiction:

Improvenumber of electrical connectionsVSAvoidwirebond interference

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a vertical dimension by creating stepped structures at different heights. Multiple rows of bonding pads are arranged at different vertical levels, allowing wirebonds to be positioned at different heights without interfering with each other. This multi-level arrangement increases the number of electrical connections while eliminating wirebond interference by separating them in the vertical dimension.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent implements a nested arrangement where wirebonds from different rows are positioned at different heights, with higher wirebonds passing over lower wirebonds. This nesting approach allows multiple wirebonds to coexist in the same spatial region without interference, enabling increased channel density while maintaining signal integrity.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Quantity of substance

If the number of bonding pads is increased to achieve higher channel density, then more electrical connections are enabled, but the module geometry and dimensions must be significantly changed

Engineering Contradiction:

Improvechannel densityVSAvoidmodule geometry

Core Design Contradiction:

Quantity of substanceVSShape

Solution Approach 1:

Instead of increasing channel density by expanding the horizontal footprint of the module, the patent utilizes the vertical dimension by creating stepped structures at different heights. This allows multiple rows of bonding pads to be arranged within the same horizontal footprint, significantly increasing channel density without altering the module's external geometry and dimensions.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Quantity of substance

If wirebonds are positioned to extend over each other to accommodate multiple rows, then manufacturing complexity increases, but electrical connections are successfully established

Engineering Contradiction:

Improveelectrical connectionsVSAvoidwirebond positioning

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

The patent employs preliminary action by pre-forming stepped structures at different heights on the bonding pad surface before wirebonding. This predetermined multi-level arrangement guides the wirebonding process, allowing wirebonds to be systematically positioned at different heights without complex real-time adjustments, thereby reducing manufacturing complexity while establishing multiple electrical connections.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12525254B2Bonding module and cable design for magnetic tape heads

Publication Date: 2026.01.13 INTERNATIONAL BUSINESS MACHINE CORPORATION

AI summary

Provided are devices and methods relating to a magnetic tape head module, including an apparatus comprising a magnetic tape head module including a module bonding pad region including a first row of module bonding pads and a second row of module bonding pads, the first row of module bonding pads and the second row of module bonding pads configured to accommodate wirebonds thereon.