Thermal Polishing Ceramic Headers for MEMS Packaging

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Solution Overview

Problem

Conventional ceramic header processing generates mobile particles during grinding, which can cause catastrophic failures in electronic devices with micro-scale or nano-scale moving parts, especially in MEMS devices, as these particles can migrate and be difficult to detect or predict, leading to latent failures.

Innovation Solution

Thermally polishing the ceramic header surfaces to fuse and secure particles, reducing the likelihood of particle migration and enhancing the reliability of ceramic-packaged devices by providing a mounting surface and conductive input-output connectors for electronic devices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional grinding is used to process ceramic header edges, then manufacturing efficiency is maintained, but mobile ceramic particles are generated that can cause catastrophic device failures

Engineering Contradiction:

Improvemanufacturing efficiencyVSAvoiddevice reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent replaces the mechanical grinding process with a thermal field approach. A thermal polishing process is applied to the ceramic header edges, using controlled heating to fuse and eliminate mobile particles without the mechanical contact that generates them. This substitution maintains manufacturing efficiency while eliminating particle generation, thereby resolving the contradiction between productivity and reliability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the processing parameters from mechanical (grinding force, speed, abrasives) to thermal (temperature, heating rate, dwell time). By controlling the thermal parameters during the polishing process, the ceramic material is heated to a temperature sufficient to fuse particles and smooth edges without compromising the structural integrity or manufacturing throughput, thus maintaining productivity while improving reliability.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If thermal polishing is applied to ceramic header surfaces, then mobile particles are eliminated, but additional processing time is required

Engineering Contradiction:

Improveparticle mitigationVSAvoidprocessing time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The thermal polishing process is performed as a preliminary step before device assembly and testing. By eliminating mobile particles early in the manufacturing process, subsequent quality control steps and particle monitoring during device operation are reduced or eliminated, offsetting the additional processing time with reduced downstream inspection and testing requirements.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent converts the additional processing time into a benefit by performing thermal polishing during a stage when the ceramic header is already in production flow. The process is integrated into the existing manufacturing sequence, and the elimination of particle-related failures later in the product lifecycle (during operation or field testing) more than compensates for the modest increase in factory processing time.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Difficulty of detecting and measuring

If particle monitoring and detection systems are implemented, then mobile particles can be detected, but device complexity and cost increase

Engineering Contradiction:

Improveparticle detection capabilityVSAvoidmonitoring system complexity

Core Design Contradiction:

Difficulty of detecting and measuringVSDevice complexity

Solution Approach 1:

The patent extracts and removes the need for complex particle monitoring systems by preventing particle generation in the first place. Through thermal polishing that fuses and eliminates mobile particles during manufacturing, the device does not require additional sensors, detection circuits, or monitoring software, thereby maintaining particle detection capability (by elimination) while avoiding increased device complexity.

Inventive Principle:

Principle #2Taking out (Extraction)

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

The thermal polishing process effectively mitigates or eliminates mobile ceramic particles, increasing the reliability of ceramic-packaged devices and reducing the need for particle level monitoring, thereby decreasing the occurrence of latent or out-of-box failures and associated costs.

Implementation Method 1

thermal polishing one or more edges of a ceramic header

Methodology Applied

Scientific EffectThermal polishing: Heating

Implementation Method 2

Thermal polishing process effectively mitigates or eliminates mobile ceramic particles

Methodology Applied

Scientific EffectFusion: Melting

Data Source

PatentUS8627566B2Method for packaging a microelectromechanical system (MEMS) device

Publication Date: 2014.01.14 TEXAS INSTRUMENTS INC

AI summary

A ceramic header configured to form a portion of an electronic device package includes a mounting portion configured to provide a mounting surface for an electronic device. In addition, the ceramic header includes one or more conductive input-output connectors operable to provide electrical connections from a first surface of the ceramic header to a second surface of the ceramic header. The ceramic header also includes one or more thermally polished surfaces.