Optical Element Unit Asymmetric Diameter Prevents Reverse Insertion
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Solution Overview
Problem
Existing optical element units do not effectively prevent reverse insertion, which can lead to incorrect orientation and functionality issues, such as reversed filter effects and obscured transparency rate indicators.
Innovation Solution
The optical element unit is designed with a first portion and a second portion of different diameters, where the first outer diameter is greater than the second inner diameter, ensuring correct orientation by preventing contact between the first outer shape portion and the second inner surface portion when inserted in reverse, thus preventing reverse insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the filter unit is designed with a simple cylindrical shape, then the ease of manufacture is improved, but the ability to prevent reverse insertion deteriorates
Solution Approach 1:
The holding member is designed with asymmetric diameter portions - a first diameter portion with a larger diameter and a second diameter portion with a smaller diameter. The opening portion correspondsingly has a first inner diameter and a second inner diameter. This asymmetric configuration creates a directional fit that allows insertion only in the correct orientation, preventing reverse insertion while maintaining manufacturability through simple geometric variations.
2Ease of operation
If the filter unit is inserted in reverse, then the insertion operation is completed, but the filter effect is reversed and indicators become unviewable
Solution Approach 1:
The asymmetric diameter design creates a mechanical constraint that physically prevents reverse insertion. The first diameter portion of the holding member fits into the first inner diameter of the opening portion only when oriented correctly. When attempted in reverse, the second diameter portion cannot pass through the first inner diameter, blocking insertion before the filter effect can be compromised.
Solution Approach 2:
The asymmetric diameter configuration establishes a preliminary mechanical barrier that counteracts reverse insertion attempts before they can affect the filter's functionality. The geometry itself acts as a preventive mechanism, stopping the incorrect orientation at the insertion stage rather than requiring additional protective measures.
Data Source
AI summary
An optical element unit is insertable into and removable from an opening portion provided in an optical apparatus and a first portion with a first inner diameter and a second portion with a second inner diameter smaller than the first inner diameter are disposed inside of the opening portion. The optical element unit has a third portion with a first outer diameter and a fourth portion with a second outer diameter smaller than the first outer diameter, wherein the first outer diameter is greater than the second inner diameter. Therefore, when the optical element unit is inserted into the opening portion in a reverse way, the third portion contacts with the second portion so that the optical element cannot be fully inserted into the opening portion.