Lens Moving Apparatus Stoppers Prevent Collision
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Solution Overview
Problem
Conventional camera modules face challenges in achieving precise autofocusing and handshake correction due to the risk of component collision and damage when moving lenses, particularly in ultracompact designs, which require accurate displacement measurement and limited movement distances.
Innovation Solution
A lens moving apparatus with a bobbin, housing, and cover member, featuring stoppers to limit movement and a position detection sensor for accurate displacement measurement, utilizing electromagnetic interaction and elastic members for controlled movement, and stoppers to prevent excessive displacement and collision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the lens is moved to achieve autofocusing and handshake correction, then the focusing accuracy and image stability are improved, but the risk of component collision and damage increases
Solution Approach 1:
The patent applies preliminary anti-action by installing stoppers on the lens barrel and corresponding stopper receiving structures on the lens holder before movement occurs. These stoppers proactively prevent excessive lens displacement by making contact when the lens reaches its movement limits, thereby avoiding component collision and damage while enabling safe autofocusing and handshake correction operations.
2Adaptability or versatility
If the lens movement distance is increased to improve focusing range, then the autofocusing capability is enhanced, but the risk of component collision increases
Solution Approach 1:
The stopper and stopper receiving structure are pre-installed to define safe movement boundaries. The stopper protrudes from the lens barrel and the receiving structure is formed on the lens holder, creating a mechanical limit that allows the lens to move within a controlled range for enhanced focusing capability while preventing excessive movement that would cause component collision.
3Reliability
If stoppers are added to limit lens movement, then component safety is improved, but the device complexity increases
Solution Approach 1:
The patent merges the stopper function into the lens barrel structure itself, where the stopper is formed as an integral part of the lens barrel. The stopper receiving structure is formed on the lens holder as a integrated feature. This merging approach allows the lens moving apparatus to limit movement and protect components without adding separate, complex limiting mechanisms.
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 apparatus effectively limits lens movement, preventing component damage and ensuring precise autofocusing and handshake correction, while accurately measuring displacement, thus enhancing the reliability and efficiency of camera modules.
Implementation Method 1
a position detection sensor for detecting a displacement value of the lens in the optical axis direction
Implementation Method 2
an elastic member extending in the optical axis direction and having an upper end coupled to the lens barrel and a lower end coupled to the holder
Data Source
AI summary
A lens moving apparatus includes a bobbin adapted to move upward and downward in a first direction, a housing in which the bobbin is accommodated and which is movable upward and downward in the first direction, a cover member accommodating the bobbin and the housing, and a base to which a lower portion of the cover member is coupled, wherein the cover member has an opening formed in an upper face thereof, and is provided at an area thereof surrounding the opening with a first stopper for limiting a distance by which the bobbin moves upward.