Shutter Device Reflection Prevention Member

Solution Overview

Problem

Existing shutter devices fail to prevent harmful light reflection from cover glasses and optical filters striking the shutter base plate, which degrades image quality.

Innovation Solution

A shutter device with a base plate, shutter blade group, rear cover, and a metal reflection prevention member fitted to the rear surface of the rear cover, where the reflection prevention member is positioned in a depressed portion to absorb and prevent light reflections.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a resin base plate is used in the shutter device, then manufacturing cost is reduced and ease of manufacture is improved, but harmful light reflection from cover glasses and optical filters striking the base plate cannot be prevented

Engineering Contradiction:

Improveease of manufactureVSAvoidharmful light reflection

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

A black painted member is introduced as an intermediary element between the light path and the resin base plate. This mediator absorbs reflected light from cover glasses and optical filters, preventing harmful reflections from reaching the image sensor while maintaining the cost advantages of using a resin base plate

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention uses a simple, inexpensive black painted member (made from inexpensive materials like black paper or black paint applied to a thin plate) rather than expensive anti-reflection coatings or complex optical elements. This cheap solution effectively absorbs stray light without requiring sophisticated manufacturing processes

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Object-affected harmful factors

If minute concavities and convexities are provided on the edge surfaces of the aperture, then light reflection from aperture edges is prevented, but harmful light reflection from cover glasses striking the base plate remains unaddressed

Engineering Contradiction:

Improvelight reflection from aperture edgesVSAvoiddevice complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The light reflection prevention function is segmented into two distinct solutions: (1) minute concavities and convexities on aperture edges for edge reflection control, and (2) a separate black painted member for absorbing reflections from cover glasses and optical filters. This segmentation allows each component to address specific reflection problems independently

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The black painted member serves as an intermediary absorption element that intercepts light reflected from cover glasses and optical filters before it can reach the image sensor, addressing a different reflection pathway than the aperture edge treatment

Inventive Principle:

Principle #24Intermediary (Mediator)

3Object-affected harmful factors

If a reflection prevention member is added to the rear surface of the rear cover, then harmful light reflection is prevented and image quality is improved, but device complexity increases

Engineering Contradiction:

Improveharmful light reflectionVSAvoiddevice complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

A black painted member is introduced as an intermediary element between the light path and the resin base plate. This mediator absorbs reflected light from cover glasses and optical filters, preventing harmful reflections from reaching the image sensor while maintaining the cost advantages of using a resin base plate

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention uses a simple, inexpensive black painted member (made from inexpensive materials like black paper or black paint applied to a thin plate) rather than expensive anti-reflection coatings or complex optical elements. This cheap solution effectively absorbs stray light without requiring sophisticated manufacturing processes

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 solution effectively prevents harmful light reflections, enhancing image quality by ensuring that reflected light is absorbed rather than redirected to the image sensor, while maintaining structural integrity and reducing manufacturing costs.

Implementation Method 1

a reflection prevention member fitted to the rear surface of the rear cover

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentUS7766563B2Shutter device and image-capturing device

Publication Date: 2010.08.03 NIKON CORP

AI summary

A shutter device includes: a base plate having a photographic aperture and a front surface and a rear surface; a shutter blade group that closes and opens the photographic aperture to light; a rear cover having an opening portion that corresponds to the photographic aperture, provided to the rear surface of the base plate with the shutter blade group between the rear cover and the rear surface of the base plate, and having a front surface and a rear surface; and a reflection prevention member fitted to the rear surface of the rear cover.