Lens Barrel Adjustment Screw with Fitting Portion for Optical Axis Alignment
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Solution Overview
Problem
Existing lens barrels face challenges in precisely adjusting the inclination of optical elements with respect to the optical axis due to the inherent looseness between adjustment screws and screw holes, leading to reduced precision in alignment.
Innovation Solution
The design incorporates an adjustment screw with a fitting portion and a through hole in the frame body holder, where the fitting portion is precisely aligned with the hole portion, eliminating the need for allowance, thus ensuring accurate orientation and adjustment of the optical axis alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If adjustment screws are used to adjust the inclination of the optical element, then the position and inclination can be adjusted, but the alignment precision is reduced due to looseness between the adjustment screw and screw hole
Solution Approach 1:
The adjustment mechanism is segmented into two independent functional parts: the threaded portion for axial movement and the fitting portion for radial positioning. This segmentation allows each part to perform its specific function without interference, eliminating the looseness problem while maintaining adjustability
Solution Approach 2:
The fitting portion acts as an intermediary element between the adjustment screw and the frame body holder. It provides a precise radial positioning interface that mediates between the threaded connection and the optical alignment requirement, eliminating direct contact looseness
2Ease of operation
If allowance is provided between the adjustment screw and screw hole for smooth tightening and loosening, then ease of operation is improved, but orientation precision is reduced due to rattling
Solution Approach 1:
The adjustment screw is segmented into the threaded portion for axial movement and the fitting portion for radial positioning. This segmentation separates the functions of smooth adjustment (threaded portion with allowance) and precision orientation (fitting portion with interference fit), allowing both requirements to be satisfied simultaneously
Solution Approach 2:
The design transitions from a single-dimensional threaded connection to a two-dimensional connection system: the threaded portion handles axial movement while the fitting portion handles radial positioning. This dimensional separation allows independent optimization of each function
Data Source
AI summary
A lens barrel includes a frame body, a frame body holder that holds the frame body, and an adjuster adjusting the inclination of the frame relative to a predetermined axis of the frame body holder. The adjuster includes an adjustment screw having a screw shaft with an external thread portion formed thereon, an internal thread portion screwed together with the external thread portion, a through hole formed in the frame body, a contact portion that is provided at a circumferential portion of the through hole, a hole portion formed in the frame body holder so as to be continuous with the internal thread portion, and a fitting portion extending from the external thread portion toward the screw tip of the adjustment screw with a fitting portion to be fitted into the hole portion.