Capacitor with Honeycomb Dielectric for High Density

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Solution Overview

Problem

Existing capacitor technologies face challenges in achieving high capacitance density, reducing Equivalent Series Inductance (ESL), and simplifying the manufacturing process due to difficulties in micromachining, electrode aspect ratio increase, and uniformity of dielectric and electrode shapes.

Innovation Solution

A capacitor design featuring a pair of conductor layers with tube-shaped dielectric substances and pillar-shaped electrodes, arranged in a honeycomb structure, using high permittivity materials and insulation to enhance capacitance density and reduce ESL, along with a manufacturing method involving anodic oxidation and seed-layer formation to simplify the process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If semiconductor grain boundary insulated dielectric substance porcelain with through holes is used as dielectric layer and electrode bodies are inserted, then capacitance can be increased, but micromachining becomes difficult and area increase is limited

Engineering Contradiction:
ImprovecapacitanceVSAvoidmicromachining difficulty
Core Design Contradiction:
Quantity of substanceVSEase of manufacture

Solution Approach 1:

The patent replaces mechanical micromachining processes with electrochemical anodization to form the dielectric layer and electrode structures. This substitution enables precise control of hole dimensions and spacing without the limitations of conventional micromachining, resolving the contradiction between increasing capacitance and maintaining ease of manufacture.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the physical and chemical parameters of the system by using anodization to create porous structures with controlled pore size, shape, and distribution. This allows precise control of electrode geometry and dielectric properties, enabling increased capacitance while maintaining manufacturing simplicity through electrochemical parameter control rather than mechanical processing.

Inventive Principle:
Principle #35Parameter changes

2Quantity of substance

If pillar-shaped bodies height is increased to increase capacitance, then capacitance density improves, but film thickness uniformity deteriorates

Engineering Contradiction:
Improvecapacitance densityVSAvoidfilm thickness uniformity
Core Design Contradiction:
Quantity of substanceVSManufacturing precision

Solution Approach 1:

The patent replaces mechanical deposition and etching processes with electrochemical anodization and electrodeposition, which provide superior control over film thickness uniformity even at increased heights. The electrochemical processes self-regulate to maintain uniformity, resolving the contradiction between increased capacitance density and maintained manufacturing precision.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The anodization process is self-limiting and self-regulating, automatically controlling the growth of the dielectric layer and electrode structures to maintain uniform thickness and geometry. This self-service mechanism ensures that even as structures increase in height for higher capacitance, the uniformity of film thickness is automatically maintained without requiring additional precision control mechanisms.

Inventive Principle:
Principle #25Self-service

3Ease of manufacture

If etching method is used to form electrode, then manufacturing process is simple, but aspect ratio in z direction cannot be increased

Engineering Contradiction:
Improvemanufacturing process simplicityVSAvoidelectrode aspect ratio
Core Design Contradiction:
Ease of manufactureVSLength of moving object

Solution Approach 1:

The patent replaces mechanical etching with electrochemical anodization followed by electrodeposition, enabling the formation of high aspect ratio electrode structures. The electrochemical processes can create vertical walls and maintain structural integrity at much higher aspect ratios than mechanical etching, while keeping the manufacturing process relatively simple through sequential electrochemical steps.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the manufacturing approach from mechanical parameter control to electrochemical parameter control, using voltage, current density, and time parameters to precisely control electrode geometry. This enables achievement of high aspect ratios by adjusting electrochemical parameters rather than being constrained by mechanical etching limitations, while maintaining process simplicity through fewer process steps.

Inventive Principle:
Principle #35Parameter changes

4Ease of manufacture

If conventional capacitor structures are used, then manufacturing is established, but ESL (Equivalent Series Inductance) cannot be reduced

Engineering Contradiction:
Improvemanufacturing establishmentVSAvoidESL
Core Design Contradiction:
Ease of manufactureVSObject-generated harmful factors

Solution Approach 1:

The patent transitions from planar electrode arrangements to three-dimensional porous structures with vertical electrode bodies extending through the dielectric layer. This dimensional change from 2D to 3D architecture reduces the current path length and inductance while maintaining manufacturing simplicity through the self-organizing nature of the anodization and electrodeposition processes.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent segments the electrode structure into numerous small, distributed electrode bodies within the porous dielectric, rather than using single large planar electrodes. This segmentation creates multiple parallel current paths that reduce equivalent series inductance, while the segmented structure is naturally formed through the anodization process that creates uniformly distributed pores throughout the dielectric layer.

Inventive Principle:
Principle #1Segmentation

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 design achieves increased capacitance density, simplifies the manufacturing process, and reduces ESL by utilizing high permittivity materials and precise electrode placement, while allowing for the selection of various electrode and dielectric materials.

Implementation Method 1

a structure of an oxide base material including a plurality of holes which are formed by anodic oxidation

Methodology Applied
Scientific EffectAnodic oxidation: Anodising

Data Source

PatentUS7903387B2Capacitor having microstructures
Publication Date: 2011.03.08 TAIYO YUDEN KK
  • US7903387B2 patent drawing
  • US7903387B2 patent drawing
  • US7903387B2 patent drawing

AI summary

A capacitor element includes a pair of conductor layers, a plurality of generally tube-shaped dielectric substances, a first electrode outside the dielectric substances and second electrodes in the insides thereof, and insulation caps for insulating the first electrode from the conductor layer, wherein an electrode material is filled in gaps of a structure of an oxide base material resulting from anodic oxidation of a metal, and then, the structure is removed and replaced by a high permittivity material.