Handheld Magnifier Camera Variable Focus Mechanism
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Solution Overview
Problem
High-resolution magnifier cameras typically experience a decrease in depth of field as resolution increases, requiring frequent refocusing, which is inconvenient for users with low vision.
Innovation Solution
A handheld magnification device with a variable focus distance mechanism, allowing mechanical adjustment of the lens focus to maintain a wider perceived depth of field, enabling higher resolution sensors without compromising focus capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of the sensor is improved, then the image quality is improved, but the depth of field decreases
Solution Approach 1:
The patent implements a dynamically adjustable focus system that allows the lens to move between multiple focal positions. This enables the camera to switch between different depth of field settings while maintaining high sensor resolution, resolving the contradiction between image quality and ease of operation across varying distances
Solution Approach 2:
The system changes the focal parameter by mechanically adjusting the lens position relative to the sensor. This allows the same high-resolution sensor to perform effectively at multiple distances by altering the optical parameters through focus adjustment
2Device complexity
If a lens with fixed focal length is used, then the device structure is simplified, but the ability to view objects at various distances is limited
Solution Approach 1:
The patent employs a dynamic focus adjustment mechanism that allows the lens to move between multiple focal positions. This creates a multi-position magnifier that can view objects at various distances while keeping the lens itself relatively simple in structure
Solution Approach 2:
The focus adjustment is divided into discrete positions rather than continuous adjustment. This segmentation approach simplifies the mechanical structure while providing adequate viewing capability at multiple distance ranges
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 users to view objects at various distances without refocusing, providing a compact, portable, and versatile magnification solution for low vision users with improved depth of field and higher resolution imaging.
Implementation Method 1
mechanically moving the lens
Implementation Method 2
at least one electrostriction unit
Data Source
AI summary
Disclosed is a magnifier for use by blind or low vision users. The magnifier includes a camera, such as a CMOS image sensor, that displays enlarged images upon a screen for easy viewing. The magnifier further includes a handle that is pivotally interconnected to a housing to allow for handheld use in a variety of different configurations.