Component, apparatus, and optical apparatus

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Solution Overview

Problem

Composite materials with fibers arranged in different directions, used in optical apparatus components, face issues with film cracking or peeling due to thermal expansion and contraction, leading to uneven stress distribution and potential damage to reflecting or coating films.

Innovation Solution

A laminated film structure is applied to the component, comprising a first layer with a Vickers hardness between 50 HV and 250 HV, and a second layer with higher hardness, to absorb and manage thermal stress, ensuring the film remains intact during temperature changes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a reflecting film is formed on the surface of a composite material component, then the temperature rise caused by light irradiation is reduced, but the film cracks or peels off when environmental temperature changes due to thermal expansion and contraction of the fibers

Engineering Contradiction:

Improvetemperature rise from light irradiationVSAvoidfilm integrity under temperature changes

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The film is divided into multiple layers with different hardness characteristics. The first layer (softer, 50-250 HV) is in direct contact with the composite material and absorbs thermal stress, while the second layer (harder) provides the reflecting function. This segmentation allows each layer to perform its specific function without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention changes the physical parameter of hardness by creating a gradient between layers. The first layer has Vickers hardness of 50-250 HV (softer) and the second layer has higher hardness. This parameter change enables the softer first layer to deform and absorb thermal stress while the harder second layer maintains its reflecting properties.

Inventive Principle:

Principle #35Parameter changes

2Shape

If a coating film is formed on a composite material component for aesthetic purposes, then the component has a well-designed external appearance, but the film cracks or peels off when environmental temperature changes

Engineering Contradiction:

Improveexternal appearanceVSAvoidfilm adhesion under thermal stress

Core Design Contradiction:

ShapeVSReliability

Solution Approach 1:

The coating system is segmented into two layers: a first layer that bonds to the composite material and absorbs thermal expansion stress, and a second layer that provides the desired aesthetic appearance. This segmentation prevents the entire coating from cracking while maintaining visual appeal.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention applies a hardness gradient parameter change where the first layer (50-250 HV) is softer and more compliant to thermal stress, while the second layer is harder and provides durable aesthetic properties. This parameter differentiation solves both appearance and reliability requirements.

Inventive Principle:

Principle #35Parameter changes

3Strength

If fibers are arranged in different directions in a composite material, then the component achieves light weight and high strength, but the fibers expand or contract unevenly causing stress on the film

Engineering Contradiction:

Improvestrength and shock resistanceVSAvoiduniformity of thermal expansion

Core Design Contradiction:

StrengthVSStability of the object's composition

Solution Approach 1:

The invention applies local quality by making the first layer have different properties (softer, lower hardness) specifically at the interface with the composite material. This localized softness allows the first layer to conform to the uneven thermal expansion of fibers in different directions, while the second layer maintains uniform reflecting properties.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The first layer acts as an intermediary between the composite material and the second layer. It mediates the stress transmission by absorbing the uneven thermal expansion forces from the anisotropic composite material, preventing these forces from reaching and damaging the second layer.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 laminated film effectively suppresses cracking and peeling, maintaining the film's integrity and functionality even under significant thermal fluctuations, enhancing the durability and practicality of the component.

Implementation Method 1

the Vickers hardness of the first layer is in a range equal to or larger than 50 HV and equal to or smaller than 250 HV

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Implementation Method 2

A Vickers hardness of the second layer is higher than a Vickers hardness of the first layer. The Vickers hardness of the first layer is in a range equal to or larger than 50 HV and equal to or smaller than 250 HV

Methodology Applied

Scientific EffectVickers hardness test: Vickers Hardness Test

Data Source

PatentUS20230384554A1Component, apparatus, and optical apparatus

Publication Date: 2023.11.30 CANON KK

AI summary

A component includes a base portion made of fiber-reinforced resin, a first layer formed on the base portion, and a second layer formed on the first layer. A Vickers hardness of the second layer is higher than a Vickers hardness of the first layer. The Vickers hardness of the first layer is in a range equal to or larger than 50 HV and equal to or smaller than 250 HV.