Optical Filter Frame with Low Modulus Light-Absorbing Film

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Solution Overview

Problem

Existing optical filters without frames are prone to detachment and breakage due to temperature variations, requiring complex and costly cutting and adhesion processes for frame attachment, which affects yield and reliability.

Innovation Solution

An optical filter with a frame having through holes and a light-absorbing film that includes a light-absorbing compound, where the average Young's modulus of the film is 2.5 GPa or less, providing resistance to environmental variations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a light-absorbing film is attached to a frame using cutting and adhesion processes, then the optical filter can be manufactured, but the manufacturing process becomes complex and costly, affecting yield and reliability

Engineering Contradiction:

Improvemanufacturing process simplicityVSAvoidcutting and adhesion process complexity

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The patent merges the frame and light-absorbing film into a single integrated structure where the film is formed directly within the frame's through-hole. This eliminates the need for separate cutting and adhesion processes, simplifying manufacturing while maintaining structural integrity and reducing process complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The frame is designed with a through-hole structure in advance, allowing the light-absorbing film to be formed directly in place within the frame. This preliminary structural preparation eliminates subsequent complex assembly steps, improving manufacturing ease and yield.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If existing optical filters are subjected to temperature variations, then environmental conditions change, but the filters experience detachment and breakage due to lack of resistance

Engineering Contradiction:

Improveresistance to temperature variationVSAvoiddetachment and breakage under temperature variation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent optimizes the Young's modulus of the light-absorbing film to 2.5 GPa or less, changing the mechanical parameter to achieve flexibility that accommodates temperature variations. This parameter optimization prevents detachment and breakage while maintaining filter functionality under thermal stress.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a composite structure combining the frame with the light-absorbing film formed within it. This composite design creates a unified structure that resists temperature-induced detachment and breakage, improving reliability under environmental variations.

Inventive Principle:

Principle #40Composite materials

3Reliability

If the Young's modulus of the light-absorbing film is reduced to 2.5 GPa or less, then resistance to environmental variation improves, but the film requires specific material composition control

Engineering Contradiction:

Improveresistance to environmental variationVSAvoidYoung's modulus control precision

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent specifies the Young's modulus parameter (≤2.5 GPa) as a key control point for achieving temperature resistance. By focusing on this specific parameter range, the patent balances manufacturing precision requirements with the need for environmental resistance, allowing controlled material selection and processing.

Inventive Principle:

Principle #35Parameter changes

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 optical filter exhibits improved resistance to temperature variations, reducing the risk of detachment and breakage, and simplifies the manufacturing process by eliminating the need for complex cutting and adhesion, thereby increasing yield and reliability.

Implementation Method 1

an optical filter including a film containing a light-absorbing compound have been attracting attention

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Implementation Method 2

Good backlit or nightscape images are more likely to be obtained using light-absorbing optical filters not including a light-reflecting film because such optical filters can reduce occurrence of ghosting and flare caused by multiple reflection

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentUS20230417967A1Optical filter, imaging apparatus, and optical filter manufacturing method

Publication Date: 2023.12.28 NIPPON SHEET GLASS CO LTD

AI summary

An optical filter 1 includes a frame 10 and a light-absorbing film 20. The frame 10 has a through hole 12. The light-absorbing film 20 is disposed to close the through hole 12 and includes a light-absorbing compound. An average Young's modulus of the light-absorbing film 20 measured by continuous stiffness measurement is 2.5 GPa or less.