Optical Imaging Lens Mounting Portion Torque Balancing
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Solution Overview
Problem
Conventional optical imaging lenses face challenges in achieving high assembly yield and maintaining excellent optical imaging quality due to issues such as torque imbalance and eccentricity, which are exacerbated by differences in the maximum outer diameters of lens elements and the distance between optical elements and the mounting portion.
Innovation Solution
The optical imaging lens design includes a lens barrel with a mounting portion, multiple lens elements, and a light-shielding element. The lens elements are arranged along an optical axis with specific mechanical surfaces to receive bearing forces. The light-shielding element is made of metal or plastic, and the optical imaging lens satisfies specific conditional expressions regarding the distances between mechanical surfaces and the carrying surface, which helps in balancing torques and maintaining optical quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the maximum radius of lens elements is reduced to decrease the area ratio of the lens to the screen, then the area ratio is reduced, but the assembly precision and optical imaging quality deteriorate due to torque imbalance and eccentricity
Solution Approach 1:
The mounting portion is designed to provide counterbalancing support forces that offset the torque imbalance caused by asymmetric lens element diameters. The mounting structure acts as a counterweight mechanism to balance the rotational forces during assembly, preventing eccentricity and maintaining assembly precision even when lens elements have significantly different maximum radii.
2Reliability
If a larger distance of 30 μm or more is maintained between the optical element and the mounting portion to avoid burr collision, then assembly defects are reduced, but the minimum distance increases beyond the compact design requirement
Solution Approach 1:
The mounting portion is designed with preliminary protective features including chamfered edges and rounded corners that prevent burr formation and collision before assembly occurs. The mounting structure incorporates preventive geometric features that eliminate the need for excessive clearance, allowing the minimum distance to be reduced to ≤5.000 μm while still preventing assembly defects.
3Adaptability or versatility
If the maximum outer diameter of a lens element is much larger than the preceding lens element, then the optical design flexibility is improved, but torque imbalance occurs during assembly causing deformation and eccentricity
Solution Approach 1:
The mounting portion provides counterbalancing support that compensates for the asymmetric weight distribution and torque imbalance caused by lens elements with significantly different diameters. The mounting structure is designed to distribute assembly forces evenly, preventing deformation and maintaining stability during assembly of optically flexible but geometrically asymmetric configurations.
4Length of moving object
If the lens elements are designed with smaller maximum radius to reduce device size, then the device size is reduced, but the assembly yield deteriorates due to increased sensitivity to assembly variations
Solution Approach 1:
The mounting portion is pre-designed with tolerance-compensating features such as chamfered edges, rounded corners, and optimized geometric profiles that guide lens element placement and accommodate assembly variations. These preliminary protective features are built into the mounting structure to ensure high assembly yield even when dealing with small-radius lens elements that are more sensitive to assembly variations.
Data Source
AI summary
An optical imaging lens includes a lens barrel, a plurality of lens elements, and a light-shielding element. The lens barrel has a mounting portion. Each of the lens elements has an object-side mechanic surface facing an object side and an image-side mechanic surface facing an image side. The optical imaging lens satisfies the following conditional expression: T1≥180 μm and at least one of the following conditional expressions: T3≤255 μm and −200 μm<RA1−RA2≤450 μm. T1 is a maximum thickness of the light-shielding element in a direction parallel to the optical axis. T3 is a maximum thickness of an optical element closest to the carrying surface in a direction parallel to the optical axis. The mounting portion can carry the light-shielding element and has a carrying surface facing the image side.