Lens Apparatus Decentering Adjustment Sealing
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Solution Overview
Problem
Conventional lens apparatuses face challenges in decentering adjustment of optical units while maintaining dust and water sealing, as gaps between the optical unit and exterior unit allow entry of contaminants during decentering operations.
Innovation Solution
A lens apparatus design incorporating a decentering absorption member that contacts the inner periphery of a fixed exterior unit, allowing orthogonal movement of the optical unit while being fixed in the orthogonal direction, and an adhesive between the hold member and decentering absorption member to maintain sealing and facilitate decentering adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the optical unit is allowed to move for decentering adjustment, then the optical performance can be optimized, but gaps between the optical unit and exterior unit allow entry of dust and water
Solution Approach 1:
A decentering absorption member is introduced as an intermediary component between the optical unit and the exterior unit. This member absorbs the decentering movement of the optical unit while maintaining contact with the exterior unit, thereby preventing gaps that would allow dust and water entry while still permitting the necessary optical adjustment
Solution Approach 2:
The decentering absorption member functions as a flexible element that can deform to accommodate the decentering movement of the optical unit. This flexibility allows the member to maintain sealing contact with the exterior unit throughout the adjustment range, preventing contaminant entry while enabling optical performance optimization
2Object-affected harmful factors
If a fixed exterior unit is used to seal the optical unit, then dust and water entry is prevented, but decentering adjustment of the optical unit becomes restricted
Solution Approach 1:
The decentering absorption member transforms the static sealing structure into a dynamic system. The member can deform and move in response to the optical unit's decentering adjustment, maintaining sealing effectiveness throughout the adjustment range while enabling the necessary optical optimization
Solution Approach 2:
The sealing function is segmented between the fixed exterior unit and the movable decentering absorption member. This segmentation allows the exterior unit to provide the fixed sealing structure while the absorption member accommodates the decentering movement, thereby maintaining both sealing effectiveness and adjustment capability
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 effectively reduces dust and water entry during decentering adjustments and provides impact resistance, ensuring the optical performance and structural integrity of the lens apparatus.
Implementation Method 1
an adhesive positioned between the hold member and the decentering absorption member in the direction orthogonal to the optical-axis
Implementation Method 2
a decentering absorption member contacting an inner periphery of the fixed exterior unit and permitting movement of the optical unit in the direction orthogonal to the optical-axis while being fixed in the direction orthogonal to the optical-axis
Data Source
AI summary
A lens apparatus according to the present invention includes: an optical unit capable of decentering adjustment in a direction orthogonal to an optical-axis; a fixed exterior unit on the outer peripheral side of the optical unit; a decentering absorption member contacting the inner periphery of the fixed exterior unit and permitting movement of the optical unit in the direction orthogonal to the optical-axis; a hold member holding the optical unit; and an adhesive positioned between the hold member and the decentering absorption member in the direction orthogonal to the optical-axis.