Lens Barrel Opening Layout for Compact Electromagnetic Lens Drive
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Solution Overview
Problem
Existing lens apparatuses face challenges in accommodating large driving mechanisms without enlarging the apparatus, leading to reduced strength and optical performance due to the need for larger openings that compromise the holding barrel's integrity.
Innovation Solution
A lens apparatus design with a moving member and holding barrel that incorporates a driving mechanism with a coil and magnetic material portion, where the outer periphery of the holding barrel has an opening portion that overlaps with the magnetic material portion, allowing for efficient assembly without increasing the apparatus size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a large driving mechanism is used to move a larger lens, then the lens apparatus can improve optical performance, but the apparatus size increases
Solution Approach 1:
The patent applies nesting by placing the coil inside the holding barrel and positioning the magnetic material portion such that it overlaps with the opening portion when viewed in the optical axis direction. This nested arrangement allows the driving mechanism components to be compactly integrated within the existing apparatus footprint, enabling larger lens movement capability without proportionally increasing the overall apparatus size.
Solution Approach 2:
The patent utilizes dimensional optimization by arranging the magnetic material portion to overlap with the opening portion in the optical axis direction rather than extending radially outward. This dimensional reconfiguration allows the driving mechanism to achieve larger lens movement capacity while maintaining a compact radial profile, effectively decoupling optical performance improvement from apparatus size increase.
2Ease of manufacture
If the opening portion of the holding barrel is enlarged to accommodate the driving mechanism, then the driving mechanism can be installed, but the strength of the holding barrel is reduced
Solution Approach 1:
The patent applies nesting by positioning the magnetic material portion to overlap with the opening portion in the optical axis direction, allowing the driving mechanism to be accommodated within the existing holding barrel structure. This arrangement minimizes the need to enlarge the opening portion, thereby maintaining the structural integrity and strength of the holding barrel while still enabling driving mechanism installation.
3Strength
If the opening portion is made smaller to maintain holding barrel strength, then the barrel strength is preserved, but the driving mechanism cannot be properly accommodated
Solution Approach 1:
The patent utilizes dimensional optimization by arranging the magnetic material portion to overlap with the opening portion in the optical axis direction rather than requiring radial extension. This dimensional reconfiguration allows the opening portion to remain small for maintaining holding barrel strength while still providing sufficient space for the driving mechanism components through strategic spatial arrangement in the optical axis dimension.
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 maintains driving efficiency while reducing the apparatus size, ensuring sufficient strength and optical performance by minimizing the opening size and optimizing component arrangement.
Implementation Method 1
a driving mechanism configured to move the moving member, wherein the driving mechanism includes: a coil held by the moving member; and a magnetic material portion held by the holding barrel
Data Source
AI summary
A lens apparatus includes a moving member configured to hold a lens and to be movable in an optical axis direction, a holding barrel configured to hold the moving member, and a driving mechanism configured to move the moving member. The driving mechanism includes a coil held by the moving member and a magnetic material portion held by the holding barrel. An outer periphery of the holding barrel is provided with an opening portion. When viewed in the optical axis direction, a part of the outer periphery overlaps with a part of the magnetic material portion so that the part of the outer periphery is arranged outside the part of the magnetic material portion.