Lens Device Movable Frame Restriction Mechanism
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Solution Overview
Problem
Existing lens devices struggle to effectively restrict the movement of movable frames, especially when the driving units, such as linear motors, are in a non-electrified state.
Innovation Solution
A lens device incorporating a movable frame with a restriction mechanism that includes a rotational movement member, a first engagement portion, and a second engagement portion. The rotational movement member moves between two positions, engaging and disengaging the engagement portions to restrict or allow movement of the movable frame, even when the driving unit is not electrified.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a linear motor is used to drive the movable frame, then the movable frame can be driven with high precision and responsiveness, but the movable frame cannot be restricted from moving when the linear motor is not electrified
Solution Approach 1:
The lock lever is designed to be rotationally movable between a first position (where movement restriction is released) and a second position (where movement is restricted). This dynamic positioning allows the restriction mechanism to adapt its state based on operational requirements, resolving the contradiction between reliable restriction and acceptable complexity.
Solution Approach 2:
The lock lever acts as an intermediary component between the movable frame and the engagement portions. By introducing this intermediate element that can rotate to engage or disengage from the engagement portions, the system achieves reliable movement restriction without requiring the linear motor itself to provide restriction functionality, thus managing complexity effectively.
2Reliability
If a lock lever with engagement portions is introduced to restrict movement, then movement restriction is achieved, but the device complexity increases
Solution Approach 1:
The lock lever integrates multiple functions into a single component: it provides movement restriction through engagement with the engagement portions, enables position switching between restricted and unrestricted states through rotation, and works cooperatively with the linear motor system. This merging approach achieves reliable restriction while minimizing the number of separate components needed.
Solution Approach 2:
The lock lever is pre-configured with engagement portions that are positioned to automatically engage with corresponding portions on the movable frame when the lock lever rotates to the second position. This preliminary arrangement ensures that movement restriction is reliably established without requiring additional active control mechanisms, thereby managing complexity.
3Reliability
If the first engagement portion and second engagement portion are designed to engage elastically, then reliable restriction is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The engagement design utilizes elastic deformation of the engagement portions as a key parameter to achieve reliable engagement. By allowing controlled elastic deformation during engagement, the system can accommodate minor manufacturing variations and maintain reliable connection without requiring extremely tight manufacturing tolerances, thus resolving the contradiction between reliability and precision requirements.
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 solution ensures reliable restriction and release of the movable frame's movement, maintaining stability and preventing unwanted movement, even in the absence of electrical power to the driving unit.
Implementation Method 1
a first engagement portion that is provided at one of the movable frame or the rotational movement member and that is elastically deformed, and a second engagement portion that is provided at the other of the movable frame or the rotational movement member and that is engaged with the first engagement portion
Data Source
AI summary
A lens device includes a movable frame movable in an extending direction of an optical axis, a first driving unit that drives the movable frame, and a restriction mechanism that restricts movement of the movable frame. The restriction mechanism includes a rotational movement member rotationally movable between a first position and a second position around a rotational axis extending in the extending direction, a first engagement portion that is provided at one of the movable frame or the rotational movement member and is elastically deformed, and a second engagement portion that is provided at the other of the movable frame or the rotational movement member and is engaged with the first engagement portion. At the first position, the first and the second engagement portions are separated from each other. At the second position, the first and the second engagement portions are engaged with each other, while being deformed.