Optical Member Driving Device With Nested Sliders
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Solution Overview
Problem
Existing small-sized camera technologies with image stabilization functions, such as the 'sensor-shift' system, face challenges in achieving precise position control due to unintentional rotation of the image sensor caused by hanging wires, making precise control difficult.
Innovation Solution
An optical member driving device comprising a sensor substrate with a first slider fixed to it, a second slider for sliding along a direction orthogonal to the optical axis, and a third slider for the lens unit, utilizing projecting members and grooves for precise alignment and magnetic components to enable controlled movement orthogonal to the optical axis, reducing sensor deviation and allowing for precise position control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If four thin hanging wires are used to suspend the image sensor, then the image sensor can be positioned and swung, but the sensor substrate may be unintentionally rotated, making precise position control difficult
Solution Approach 1:
The patent divides the positioning mechanism into three independent sliders (first slider on sensor substrate, second slider for first direction movement, third slider for second direction movement), each responsible for a specific degree of freedom. This segmentation allows precise control of each movement axis independently, preventing unwanted rotation while enabling accurate positioning.
Solution Approach 2:
The patent introduces groove-and-projecting member interfaces as intermediary coupling mechanisms between sliders. The first groove fitting the first projecting member and the second groove fitting the second projecting member act as mechanical intermediaries that transmit motion precisely without introducing rotational errors, solving the position control precision issue.
2Ease of operation
If a magnet and coil system is used to drive the sensor substrate or lens unit, then controlled movement orthogonal to the optical axis is achieved, but the device height in the optical axis direction increases
Solution Approach 1:
The patent places the magnet and coil components inside hollow portions of the slider structures. Specifically, the first magnet and first coil are positioned within the hollow portion of the first slider, and the second magnet and second coil are positioned within the hollow portion of the second slider. This nesting approach integrates the electromagnetic driving components into the existing mechanical structure without increasing the overall device height.
3Device complexity
If the first slider is formed with a quadrangular frame shape and hollow portion, then the magnet and coil can be accommodated, but the structure becomes more complex
Solution Approach 1:
The hollow portions of the sliders serve multiple functions simultaneously: they accommodate the magnet and coil components for electromagnetic driving, provides structural support for the slider, and maintain the overall mechanical integrity of the positioning system. This multi-functionality reduces the need for separate housing structures.
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 reduces sensor deviation and enables precise position control by using a combination of sliders and magnetic components to stabilize the image sensor's movement, ensuring accurate alignment and image stabilization.
Implementation Method 1
a magnet is provided on any one of the sensor substrate and the lens unit, and a coil is provided on another one of the sensor substrate and the lens unit. Through use of the magnet and the coil, the lens unit or the sensor substrate is driven in the direction orthogonal to the optical axis direction of the lens.
Data Source
AI summary
An optical member driving device, including: a sensor substrate to which an image sensor is fixed; a first slider fixed to the sensor substrate; a second slider slidable along a first direction orthogonal to an optical axis direction; and a third slider which is fixed to a lens unit which includes, and is slidable along a second direction, wherein any one of the first slider and the second slider has a first projecting member extending along the first direction, and another one of the first slider and the second slider has a first groove that is to fit over the first projecting member, and wherein any one of the second slider and the third slider has a second projecting member extending along the second direction, and another one of the second slider and the third slider has a second groove that is to fit over the second projecting member.