External Lens Adjustment Module With Rotation Limit Feedback
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Solution Overview
Problem
Existing projector lenses are adjusted manually, leading to potential collisions due to excessive rotation, and there is a need for electric adjustment to prevent such collisions.
Innovation Solution
An external electric adjusting module with a bracket, gear set, driving assembly, and variable resistance rotating member is used to externally connect to the lens, allowing for precise electric adjustment while preventing excessive rotation through alignment and angle control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual adjustment is used for the lens, then the structure remains simple, but collision may occur due to excessive rotation
Solution Approach 1:
The patent replaces the purely mechanical manual adjustment system with an electromechanical system. A motor-driven gear set substitutes the manual rotation mechanism, enabling precise control of lens rotation angle through electrical signals while preventing excessive rotation and collision. The gear set includes a driving gear, driven gear, and limiting mechanism that mechanically restricts the maximum rotation angle.
Solution Approach 2:
The patent implements a feedback control system where a sensor detects the rotation angle of the lens and sends signals to a control circuit. The control circuit monitors the lens position in real-time and stops the motor when the predetermined rotation angle is reached, preventing excessive rotation and collision. This closed-loop feedback ensures reliable operation while maintaining relatively simple structure.
2Reliability
If electric adjustment is implemented, then collision can be prevented, but the device complexity increases
Solution Approach 1:
The patent divides the adjustment system into modular components: a motor module, a gear transmission module, a sensor module, and a control module. Each component performs a specific function and can be independently designed and assembled. The gear set is segmented into driving gear, driven gear, and position-limiting elements, reducing overall system complexity while enabling precise collision prevention.
Solution Approach 2:
The patent introduces a gear set as an intermediary mechanism between the motor and the lens. The gear set not only transmits motion but also incorporates position-limiting features that mechanically prevent excessive rotation. This intermediary component simplifies the control system by combining mechanical protection with motion transmission.
3Reliability
If the lens rotation angle is limited, then collision is prevented, but the adjustment range may be restricted
Solution Approach 1:
The patent implements a dynamic adjustment system where the lens rotation angle can be precisely controlled within a predetermined range. The system allows full utilization of the safe adjustment range while preventing only the excessive rotation that causes collision. The motor-driven gear set provides smooth, controlled motion throughout the entire adjustment range, maximizing adaptability within safety limits.
Solution Approach 2:
The patent optimizes the gear ratio and position-limiting parameters to maximize the useful adjustment range while preventing collision. By carefully selecting the rotation angle limit parameter and gear transmission ratio, the system achieves the maximum possible zoom or focus adjustment range without exceeding the collision threshold. The predetermined rotation angle is set to fully utilize the optical system's capabilities while maintaining safety.
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 module enables precise electric adjustment of the lens, limiting rotation within a predetermined range to prevent collisions and ensuring smooth operation.
Implementation Method 1
The variable resistance rotating member includes a second driving portion corresponding to the first driving portion to be linked with the rotating shaft
Implementation Method 2
The gear set includes a second positioning portion, a rotating shaft, and a first driving portion located on the rotating shaft
Data Source
AI summary
An external electric adjusting module adapted for being externally connected to a lens includes a bracket including a first positioning portion, a gear set, a driving assembly driving the gear set to operate, and a variable resistance rotating member. The gear set is rotatably disposed on the bracket, is adapted for being externally connected to the lens, and includes a second positioning portion, a rotating shaft, and a first driving portion located on the rotating shaft. The variable resistance rotating member is sleeved on the rotating shaft, is electrically connected to the driving assembly, and includes a second driving portion corresponding to the first driving portion to be linked with the rotating shaft. When the gear set is located at an initial position together with the lens, the first and second positioning portions are aligned with each other, and the second driving portion abuts against the first driving portion.