Zoom Lens Spring Mechanism for Optical Axis Alignment
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Solution Overview
Problem
Conventional zoom lenses experience lateral movements during collapsing operations, leading to optical axis deviation and compromised optical performance due to clearance between internal and external frames.
Innovation Solution
A zoom lens design incorporating an external frame, rotary shaft, internal frame, and a spring with extension parts inclined at an acute angle to exert a lateral thrust force, preventing lens group movement and maintaining optical axis alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the third lens group is moved along the optical axis and rotated to leave space for other lens groups, then the zoom lens achieves miniaturization, but the lens group undergoes lateral movements due to clearance between frames causing optical axis deviation
Solution Approach 1:
A spring is introduced as an intermediary component between the internal frame and external frame to provide lateral support to the rotating lens group. The spring's extension parts are positioned to exert lateral thrust forces that counteract lateral movements, thereby preventing optical axis deviation while allowing the collapsing operation to proceed.
Solution Approach 2:
The spring is configured with extension parts inclined at a specific acute angle (60°-80°) relative to the rotary shaft. This angular parameter is optimized to generate effective lateral thrust forces that prevent lateral movements of the lens group during rotation, while the spring itself remains compact to minimize impact on the overall lens volume.
2Ease of operation
If clearance is provided between internal and external frames to allow rotation, then the lens group can rotate smoothly, but lateral movements occur causing deviation from the preset optical axis
Solution Approach 1:
The spring acts as a mediator that provides lateral support to the rotating lens group without interfering with its rotational movement along the optical axis. The spring's flexible nature allows it to accommodate rotation while its inclined extension parts generate lateral thrust forces that stabilize the optical axis position.
Solution Approach 2:
The spring is designed to exert lateral thrust forces that counterbalance the lateral movements caused by clearance between frames. By positioning the spring's extension parts at specific angles, the lateral forces generated by the spring oppose and cancel out the harmful lateral displacements, thereby maintaining optical axis stability during rotation.
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 acute angle configuration in the spring design effectively prevents lateral movements of the lens group, ensuring the optical axis remains aligned and maintaining the overall optical performance of the zoom lens.
Implementation Method 1
The spring includes a deformation part and two extension parts extended from the deformation part, in which one extension part is propped against the internal frame and inclined at an acute angle relative to the rotary shaft, and the other extension part is propped against the external frame.
Implementation Method 2
The spring includes a deformation part and two extension parts extended from the deformation part... one extension part is propped against the internal frame and inclined at an acute angle relative to the rotary shaft
Data Source
AI summary
A zoom lens includes an external frame, a rotary shaft, an internal frame, a lens group and a spring. The internal frame is connected to the external frame via the rotary shaft, so that the internal frame is rotatable relative to the external frame. The lens group is fixed in the internal frame. The spring comprises a deformation part and two extension parts extended from the deformation part, wherein one extension part is propped against the internal frame and inclined at an acute angle relative to the rotary shaft, and the other extension part is propped against the external frame.