Focusing Module Relay Gear Stroke Limiting Mechanism
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Solution Overview
Problem
In projectors, the continuous motor force applied to the focusing ring after it reaches a limit position can cause image jitter or shift and structural damage due to uncontrolled thrust and reaction forces.
Innovation Solution
A focusing module with a relay gear system that limits the rotation stroke of the relay gear to be smaller than the focusing ring, preventing excessive force transfer and using structural elements like limiting slots and columns to stop the gear at specific positions, thus controlling the rotation and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the motor continues to drive the focusing ring beyond its limit position, then the focusing ring can be adjusted to extreme positions, but the output force causes image jitter or shift and structural damage
Solution Approach 1:
The patent applies preliminary anti-action by designing the relay gear's maximum rotation stroke to be less than the focusing ring's maximum rotation stroke. This creates a preliminary protective mechanism that stops force transmission before the focusing ring reaches positions that would cause image jitter or structural damage, preventing harmful effects before they occur.
Solution Approach 2:
The relay gear serves as an intermediary mechanism between the motor and the focusing ring. By limiting the relay gear's rotation stroke, it mediates the force transmission, allowing the focusing ring to be adjusted through its full range while preventing excessive force from reaching the lens module and causing damage.
2Productivity
If the motor provides continuous output force to the focusing ring, then the focusing adjustment can be completed, but repeated long-term operation causes reaction force leading to structural loss
Solution Approach 1:
The limited rotation stroke of the relay gear creates a preliminary protective barrier that prevents excessive reaction forces from being transmitted to the focusing module structure during repeated operations, thereby preventing structural degradation while maintaining efficient focusing adjustment.
3Reliability
If the relay gear rotation stroke is limited to be smaller than the focusing ring rotation stroke, then image jitter and structural damage are prevented, but the force transmission efficiency is reduced
Solution Approach 1:
The patent converts the potential harm of force transmission into a beneficial protective feature. By deliberately limiting the relay gear's rotation stroke, the system transforms what could be seen as an efficiency loss into a protective mechanism that prevents image jitter and structural damage, making the 'inefficiency' a feature rather than a bug.
Data Source
AI summary
The focusing module suitable for a lens module includes a focusing ring having a first maximum rotation stroke and being suitable for rotation to adjust the focal length of the lens module. The focusing module connected to the focusing ring includes a bracket, a drive unit disposed on the bracket, a relay gear connected to the drive unit, a first structure formed on the bracket, and a second structure formed on the relay gear. The focusing ring is connected to the relay gear, and the drive unit is configured to drive the relay gear to rotate to drive the focusing ring to rotate. When the relay gear rotates relatively to the bracket, the first structure and the second structure are suitable for stopping each other to limit rotation of the relay gear, so that the relay gear has a second maximum rotation stroke smaller than the first maximum rotation stroke.