Optical Module Lead Screw Actuation for Compact Auto-Focus and Zoom
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Solution Overview
Problem
Modern digital camera implementations face constraints such as increased cost, reduced features, and complexity due to miniaturization, particularly in achieving effective auto-focus and zoom functions within a compact form factor.
Innovation Solution
An optical module comprising a first and second optics group coupled to lead screws with sensing targets and actuators, allowing for precise translation and rotation to provide focus and magnification to an image sensor, while preventing backlash through spring-hinged assemblies and vibrational actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If miniaturization of optical and mechanical parts is implemented, then camera size is reduced, but cost increases and complexity increases
Solution Approach 1:
The patent combines the zoom mechanism and auto-focus mechanism into a single integrated optical module. The first and second optics groups share common structural elements and are controlled through integrated actuators, reducing the overall mechanical complexity while maintaining miniaturization benefits
Solution Approach 2:
The optical module is designed to perform multiple functions (zoom and auto-focus) within a compact structure. The lead screw mechanisms serve dual purposes of positioning different optics groups, and the sensing targets provide feedback for both zoom and focus control, reducing the need for separate dedicated components
2Volume of moving object
If miniaturization of optical and mechanical parts is implemented, then camera size is reduced, but manufacturing cost increases
Solution Approach 1:
The optical module is divided into distinct functional segments (first optics group, second optics group, lead screw assemblies, sensing targets) that can be manufactured separately and then assembled. This modular approach simplifies manufacturing processes and reduces costs associated with miniaturized integrated components
3Manufacturing precision
If lead screws are used to translate optics groups, then precise positioning is achieved, but backlash occurs
Solution Approach 1:
The spring-hinged assembly is designed to apply preliminary preloading force to the lead screw threads before operation. This preloading eliminates clearance and prevents backlash from occurring during reverse direction changes, while maintaining the precise positioning capability of the lead screw mechanism
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 efficient auto-focus and zoom capabilities with high precision and reduced complexity, maintaining a compact form factor and minimizing cost, allowing for versatile applications in small devices like mobile phones and consumer electronics.
Implementation Method 1
a cylindrical vibrational actuator which oscillates in a standing wave pattern to drive a shaft placed therein to rotate
Implementation Method 2
spring-hinged assemblies
Data Source
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AI summary
An optical module includes a first optics group, a second optics group, and an image sensor, wherein the first optics group and second optics group are configured to provide an image having a focus and a magnification to the image sensor. An optics assembly includes first and second optics groups coupled to threaded portions of lead screws so that rotation of a lead screw results in translation of the optics group along an axis of the lead screw, an actuator for rotating the lead screws; and a sensing target configured to permit detection of rotation of the lead screws.