Nested Lens Actuator Layout for Slim Smartphone Cameras
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Solution Overview
Problem
Existing camera devices with auto focus and optical image stabilization functions require a larger size, causing them to protrude from smartphones, which is undesirable.
Innovation Solution
A lens driving device with a base, first and second holders, and a bobbin, each moved by separate driving units comprising coils and magnets, allowing for minimized size while maintaining functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If magnet and coil constitutions for auto focus and optical image stabilization are placed, then both auto focus function and optical image stabilization function are provided, but the camera device size increases and protrudes from smartphone
Solution Approach 1:
The patent implements a nested structure where the first holder containing the first driving unit is disposed within the second holder containing the second driving unit, and the bobbin containing the lens is disposed within the first holder. This nested arrangement allows multiple functional components to occupy overlapping spatial volumes, reducing the overall camera device size in the optical axis direction while maintaining both auto focus and optical image stabilization functionalities.
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement by disposing holders and driving units at different positions along the optical axis and in radial directions. The first and second driving units are positioned at different radial distances from the optical axis, and the nested holders create layered structures along the optical axis, effectively using multiple dimensions to pack components densely without increasing the protruding size.
2Adaptability or versatility
If multiple driving units with coils and magnets are integrated, then auto focus and optical image stabilization functions are achieved, but device complexity increases
Solution Approach 1:
The patent designs the lens driving device as an integrated assembly where the base, holders, driving units, and bobbin work together as a unified multi-functional system. The first driving unit provides auto focus capability while the second driving unit provides optical image stabilization, and both are incorporated into a single device structure that performs multiple functions simultaneously, reducing the need for separate 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
Enables both auto focus and optical image stabilization functions without protruding from the smartphone, achieving a minimized size in the optical axis direction.
Implementation Method 1
a first driving unit configured to move the first holder in a z-axis direction along an optical axis, the first driving unit may comprise a coil coupled to one of the base and the first holder and a magnet coupled to the other of the base and the first holder
Implementation Method 2
a second driving unit configured to move the second holder in a y-axis direction perpendicular to the z-axis direction, the second driving unit may comprise a coil coupled to one of the base and the second holder and a magnet coupled to the other of the base and the second holder
Implementation Method 3
a third driving unit configured to move the bobbin in an x-axis direction perpendicular to the z-axis direction and the y-axis direction, the third driving unit may comprise a coil coupled to one of the base and the bobbin and a magnet coupled to the other of the base and the bobbin
Data Source
AI summary
The embodiment relates to a lens driving device comprising: a base; a first holder disposed in the base; a second holder disposed in the first holder; a bobbin disposed in the second holder; a first driving unit for moving the first holder in a z-axis direction along an optical axis; a second driving unit for moving the second holder in a y-axis direction perpendicular to the z-axis direction; and a third driving unit for moving the bobbin in an x-axis direction perpendicular to both the z-axis direction and the y-axis direction. Each of the first to third driving units includes a coil and a magnet.