Optical Unit Lens Frame Slit Blade Driving Device
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Solution Overview
Problem
In small optical units, the narrow spacing between lenses makes it difficult to insert the insertion portion of a blade driving device without contacting a lens, and there is a risk of deformation or shifting of the positional relationship between the lens frame and the blade driving device, leading to contact with the lens.
Innovation Solution
An optical unit with a lens frame having a slit and a blade driving device featuring a recessed lens frame storing portion with protruding insertion portions, where the insertion portion is disposed between lenses, and includes supporting faces perpendicular to the optical axis and contact surfaces to prevent movement and contact with the lens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the insertion portion is inserted into the slit between lenses in a small optical unit, then the spatial efficiency is improved, but the risk of contact with the lens increases due to narrow spacing
Solution Approach 1:
The patent introduces a blade holding portion as an intermediary structure that mediates between the insertion portion and the lens. This blade holding portion includes a blade insertion slit and a blade, creating an additional layer that prevents direct contact between the insertion portion and the lens while maintaining the compact spatial arrangement.
Solution Approach 2:
The blade holding portion acts as a protective buffer that is positioned beforehand between the insertion portion and the lens. This cushioning structure prevents harmful contact by absorbing or distributing forces before they can reach the lens, thereby maintaining reliability in the compact design.
2Length of moving object
If the insertion portion is made compact for small optical units, then the device size is reduced, but the positional stability between lens frame and blade driving device deteriorates
Solution Approach 1:
The patent divides the blade driving device into distinct functional segments: the insertion portion, the blade holding portion, and the blade. This segmentation allows each component to be optimized independently - the insertion portion remains compact for small device size, while the blade holding portion provides structural stability and positional control.
Solution Approach 2:
The blade holding portion introduces an additional dimensional layer between the insertion portion and the lens assembly. By adding this intermediate structure along the optical axis, the patent maintains compact radial dimensions while improving axial positional stability through the multi-layered configuration.
3Volume of moving object
If the insertion portion is inserted without sufficient clearance, then the spatial efficiency is improved, but the risk of deformation under load increases
Solution Approach 1:
The blade holding portion serves as a mediator that distributes mechanical loads between the insertion portion and the lens assembly. This intermediate structure prevents concentrated forces from deforming the insertion portion by providing an additional load path through the blade and blade holding portion.
Solution Approach 2:
The blade holding portion provides beforehand cushioning by absorbing and distributing mechanical stresses before they can deform the insertion portion. This protective structure maintains the compact spatial arrangement while reinforcing the overall mechanical strength of the assembly.
Data Source
AI summary
An optical unit has a lens frame that has a slit in a cylinder, and a blade driving device, comprising an insertion portion for insertion into the slit, wherein an opening, provided in the insertion portion, is disposed between lenses in a lens frame, wherein: the blade driving device comprises a frame that has a recessed lens frame storing portion with the insertion portion protruding; a cylinder of the lens frame comprises a pair of supporting faces that are perpendicular to the optical axis of the lens; and the lens frame storing portion of the frame has contact surfaces that contact each of a pair of supporting faces.