Lens Drive Structure Shielding the Sensing Magnet During UV Curing
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Solution Overview
Problem
Conventional camera devices face challenges in maintaining the characteristic integrity of sensing magnets due to heat-induced changes caused by UV beams used in the curing process of adhesives for fixing lenses to bobbins.
Innovation Solution
A lens driving device is designed with a specific structure that includes a bobbin with a recess for the second magnet, an upper elastic member with a region overlapping the second magnet, and a lateral elastic member connecting the substrate and the upper elastic member, thereby preventing UV-induced changes in the sensing magnet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If UV beams are used to cure adhesives for fixing the lens to the bobbin, then the lens can be securely fixed, but the sensing magnet experiences heat-induced characteristic changes
Solution Approach 1:
A magnet shielding member is introduced as an intermediary component between the UV irradiation source and the sensing magnet. This shielding member selectively blocks UV beams from reaching the sensing magnet while allowing the adhesive curing process to proceed, thereby preventing heat-induced characteristic changes in the sensing magnet while maintaining secure lens fixation
Solution Approach 2:
The housing structure is segmented to include a dedicated magnet shielding member that can be positioned specifically to protect the sensing magnet region. This segmentation allows differential treatment of different areas - the adhesive application area receives UV irradiation while the sensing magnet area is protected
2Ease of manufacture
If the sensing magnet is exposed to UV beams during adhesive curing, then the lens can be fixed to the bobbin, but the sensing magnet's characteristics change due to heat
Solution Approach 1:
The magnet shielding member is pre-installed in the housing before the adhesive curing process. This preliminary protective action ensures that when UV beams are subsequently applied for adhesive curing, the sensing magnet is already protected from heat exposure, maintaining manufacturing precision while enabling easy lens fixation
Solution Approach 2:
The magnet shielding member serves as a protective intermediary that allows the adhesive curing process to proceed normally while preventing harmful UV-induced heat from reaching the sensing magnet, thus preserving manufacturing precision without complicating the manufacturing process
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 solution effectively prevents characteristic changes in the sensing magnet due to UV exposure and enhances the fixing power of the sensing magnet, ensuring stable autofocus performance.
Implementation Method 1
the upper elastic member may comprise an inner portion coupled with the bobbin, an outer portion coupled with the housing, a connection part connecting the inner portion and the outer portion, and a first region extended from the inner portion to overlap the second magnet to an optical axis direction of the lens, and characterized in that the first region is overlapped with at least 90% of an upper surface of the second magnet in the optical axis direction
Implementation Method 2
an upper elastic member connecting an upper portion of the housing and an upper portion of the bobbin
Data Source
Figure 1
Figure 2
Figure 3a
AI summary
An embodiment of the present invention relates to a lens driving device comprising: a base; a housing; a bobbin; a first magnet; a first coil; a first substrate including a second coil; an upper elastic member; a lateral elastic member; a second magnet; and a sensor, wherein the bobbin comprises a recess in which the second magnet is disposed; the upper elastic member comprises comprises an inner portion coupled to the bobbin, an outer portion coupled to the housing, and a connection part connecting the inner portion and the outer portion to each other, and the inner portion includes a first region overlapping the second magnet in the optical axis direction.