Imaging Device Lens Barrel Projection Adhesive Control
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Solution Overview
Problem
Conventional imaging devices face challenges in maintaining the adjusted inclination of the imaging element relative to the optical axis of the lens due to adhesive shrinkage, which causes shifts in the relative position between the lens barrel and the imaging unit after curing.
Innovation Solution
An imaging device design featuring a lens barrel and an element holder with a projection and insertion hole configuration, where an elastic body is fitted between them, preventing adhesive flow and ensuring secure fixation only at specific points, thus maintaining the adjusted inclination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If adhesive is applied between the lens barrel and the imaging unit to secure them after adjusting the inclination of the imaging element, then the lens barrel and imaging unit are fixed together, but the inclination of the imaging element relative to the optical axis of the lens shifts due to adhesive shrinkage during curing
Solution Approach 1:
The adhesive application area is segmented into two distinct zones: a first adhesive application area on the lens barrel that contacts a first surface of the imaging unit, and a second adhesive application area on the lens barrel that contacts a second surface of the imaging unit. This segmentation allows the adhesive to be applied in controlled portions, reducing overall shrinkage impact and preventing concentrated stress that would cause inclination shift.
Solution Approach 2:
The adhesive application employs local quality by applying adhesive to specific localized areas (first and second adhesive application areas) rather than uniformly across the entire contact surface. This localized application strategy controls where adhesive shrinkage occurs, preventing it from affecting the inclination adjustment while still achieving secure fixation of the lens barrel to the imaging unit.
2Stability of the object's composition
If adhesive is applied to secure the lens barrel and imaging unit, then they are fixed together, but adhesive flows between the lens barrel and imaging unit in the optical axis direction causing unintended fixation
Solution Approach 1:
The projection is preliminarily formed on the lens barrel protruding toward the imaging unit, and the insertion hole is preliminarily formed on the imaging unit. These preliminary structural features guide the adhesive to be applied only in the gaps between the projection and insertion hole, preventing adhesive from flowing in the optical axis direction while ensuring proper fixation. This preliminary structural preparation simplifies the adhesive application 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 the lens barrel and element holder from being securely fixed at unintended locations, thereby maintaining the adjusted inclination of the imaging element relative to the optical axis even after adhesive curing, reducing positional shifts.
Implementation Method 1
an elastic body disposed between the lens barrel and the element holder in the optical axis direction
Implementation Method 2
an adhesive for fixing the lens barrel and the element holder is filled between the outer peripheral surface of the projection and the inner peripheral surface of the insertion hole
Data Source
AI summary
An imaging device is provided that includes: a lens barrel, an element holder adhesively secured to one end of the lens barrel while holding an imaging element; and an elastic body disposed between the lens barrel and the element holder. The lens barrel has formed thereon a projection projecting toward the element holder. The element holder has formed therein an insertion hole into which the projection is inserted. The elastic body is fitted to the projection with the projection inserted into an insertion hole in the elastic body. In the imaging device, an outer peripheral surface of the projection and an inner peripheral surface of the insertion hole are in contact with each other, and the element holder is in contact with the elastic body on the periphery of the insertion hole. An adhesive is filled between the projection and the insertion hole.