Collapsible Lens Barrel with Nested Focus Mechanism
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Solution Overview
Problem
Existing collapsible lens barrels for imaging devices face challenges in achieving a compact collapsed state during non-shooting while enabling effective movement of the focus lens group to the image plane side during shooting, particularly in maintaining a compact size and ensuring precise focusing across various zoom ranges.
Innovation Solution
A collapsible lens barrel design featuring a base barrel, a drive device with a linear motion member and drive source, a cam frame with a cam groove, a drive device frame, a focus lens group frame, and an arm extending towards the object side, allowing the focus lens group to reciprocate along the optical axis, with the arm's contact part engaging the linear motion member to facilitate compact collapse and extended focusing range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lens barrel is designed to be extended for zooming during shooting, then the focusing capability is improved, but the collapsed size during non-shooting increases
Solution Approach 1:
The lens barrel employs a nested structure where the focus lens group frame is disposed inside the base barrel when collapsed, with the contact part extending toward the object side. This nesting arrangement allows the lens barrel to achieve a compact collapsed state while maintaining the capability to extend the focus lens group for focusing during shooting.
Solution Approach 2:
The lens barrel utilizes a dynamic mechanism involving the linear motion member that can reciprocate in the optical axis direction. The contact part engages with the linear motion member to enable the focus lens group frame to move dynamically between collapsed and extended positions, allowing the system to adapt between compact storage and focusing operations.
2Length of moving object
If the contact part is extended closer to the object side, then the collapsed length is reduced, but the movable range of the linear motion member is constrained
Solution Approach 1:
The contact part is positioned to engage with the linear motion member in a way that utilizes the optical axis dimension effectively. By extending the contact part closer to the object side, the system optimizes the use of available space along the optical axis, allowing the focus lens group to achieve sufficient movement range within the constrained collapsed length.
3Measurement precision
If the focus lens group is moved to the image plane side during shooting, then the focusing precision is improved, but the collapsed configuration becomes more complex
Solution Approach 1:
The lens barrel is divided into distinct functional segments: the base barrel, the focus lens group frame, and the drive device with the linear motion member. This segmentation allows each component to perform its specific function independently, simplifying the overall collapsed configuration while enabling precise focusing through the coordinated movement of the focus lens group.
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 design achieves a compact collapsed state and allows for precise focusing across wide-angle and telephoto ends, enabling a compact lens barrel that can vary magnification over a wide range while maintaining a reduced length, thus enhancing the imaging device's zoom capabilities.
Implementation Method 1
a cam frame disposed inside the base barrel and provided with a cam groove, a drive device frame that is engaged with the cam groove in the cam frame and causes the drive device to reciprocate in the optical axis direction
Implementation Method 2
a drive device including a linear motion member reciprocating in an optical axis direction and a drive source for driving the linear motion member
Implementation Method 3
a contact part extending from the focus lens group frame toward an object side and engaged with the linear motion member to cause the focus lens group frame to reciprocate in the optical axis direction
Data Source
AI summary
Provided is a collapsible lens barrel including a base barrel, a drive device including a linear motion member reciprocating in an optical axis direction and a drive source for driving the linear motion member, a cam frame provided with a cam groove, a drive device frame that is engaged with the cam groove and causes the drive device to reciprocate in the optical axis direction, a focus lens group frame that holds a focus lens group, and a contact part and an arm that extend from the focus lens group frame toward an object side and are engaged with the linear motion member to cause the focus lens group frame to reciprocate in the optical axis direction.