Collapsible Lens Barrel Shutter Restriction Mechanism
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Solution Overview
Problem
Collapsible lens barrels face interference issues between lenses and the opening/closing portion due to shocks, which can cause damage and breakage when switching states.
Innovation Solution
A collapsible lens barrel design that includes a restriction mechanism using a restriction portion and holding frames to maintain the opened state of the shutter blade, preventing interference and damage by restricting the operation of the shutter unit's projection via the inner and outer frames during collapse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the opening/closing portion is allowed to switch from opened to closed state during collapse, then the device can adapt to different operational states, but lens interference and damage occur due to shock
Solution Approach 1:
The restriction portion is designed to preemptively prevent the maintaining portion from moving to the closed state during collapse by applying restriction force before shock can cause unwanted movement. This preliminary anti-action eliminates the harmful interference between lens and opening/closing portion while preserving the ability to switch states under normal operational conditions.
2Object-affected harmful factors
If the maintaining portion is restricted during collapse, then lens interference is prevented, but the operation of the maintaining portion is constrained
Solution Approach 1:
The restriction mechanism is designed to be dynamic rather than static - the restriction portion only applies restriction force when the outer frame and inner frame are collapsed together. When the frames are extended, the restriction is released and the maintaining portion can operate freely to switch between opened and closed states. This dynamic approach prevents lens interference during collapse while preserving ease of operation during normal use.
3Volume of moving object
If the lens barrel is made collapsible, then the device size is reduced, but interference between lens and opening/closing portion occurs during state switching
Solution Approach 1:
The lens barrel is divided into collapsible outer frame and inner frame components that can be stacked during collapse to reduce volume. The restriction portion is integrated into this segmented structure to specifically address the interference problem that arises during collapse, allowing the volume reduction benefit to be realized without suffering from lens interference issues.
Data Source
AI summary
A collapsible lens barrel includes: an opening/closing unit (shutter unit) that includes an opening/closing portion (shutter blade) openable and closable along a plane orthogonal to an optical axis to control a light amount, and a maintaining portion (projection) that maintains an opened state of the opening/closing portion; an inner lens disposed closer to an object than the opening/closing unit is; an inner frame that holds the inner lens; an outer lens disposed closer to the object than the inner lens is; an outer frame that holds the outer lens; and a restriction portion that restricts operation of the maintaining portion by restriction applied from the outer frame to the maintaining portion via the inner frame to maintain the opened state of the opening/closing portion when the outer frame and the inner frame are collapsed.