Adjustable Electronic Viewfinder Lens Group Diopter
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Solution Overview
Problem
Existing electronic viewfinders fail to optimize magnification, resolution, and user comfort for different observers due to fixed diopter settings, which can lead to suboptimal image viewing experiences.
Innovation Solution
An adjustable electronic viewfinder with a lens group comprising a first lens with positive power and a second lens with negative power, allowing for diopter adjustment and relocation to accommodate individual observers' least distance of distinct vision, providing adjustable magnification and eye relief.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the electronic viewfinder uses a fixed diopter setting, then the structure is simple and cost-effective, but the magnification and resolution cannot be optimized for different observers
Solution Approach 1:
The patent implements a movable lens group that can be relocated along the optical axis to adjust the diopter setting. This dynamic structure allows the viewfinder to adapt to different observers' least distance of distinct vision (LDDV) requirements, transforming a static fixed-diopter design into an adjustable system that maintains clarity for various users without requiring multiple separate devices
Solution Approach 2:
The patent changes the optical parameter (diopter) by physically relocating the lens group to different positions along the optical axis. This parameter adjustment enables the system to optimize magnification and resolution for different observers, with the lens group's position directly controlling the effective diopter value and allowing customization for individual viewing preferences
2Weight of moving object
If the electronic viewfinder is made slimmer and lighter, then the portability is improved, but the magnification and resolution optimization is compromised
Solution Approach 1:
The patent resolves the contradiction between slimness and resolution by introducing a longitudinal dimension for adjustment. Instead of increasing the overall size of the viewfinder, the lens group can be moved along the optical axis (length dimension) to achieve focus and magnification adjustments, allowing the viewfinder to remain compact in width and height while providing resolution optimization through axial position changes
3Ease of operation
If the lens group is relocated to adjust diopter, then the adaptability for different observers is improved, but the device complexity increases
Solution Approach 1:
The movable lens group serves multiple functions simultaneously: it adjusts the diopter setting for different observers, optimizes the magnification level, and maintains proper focus across the viewing field. This single adjustable component performs what would otherwise require multiple separate mechanisms, providing universal adaptability while minimizing the overall complexity of the adjustment system
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 clear and magnified image transmission for observers with a wide range of diopter values, achieving high-resolution and comfort in a compact design, with adjustable diopter range and enhanced eye relief.
Implementation Method 1
The lens group is able to enlarge images shown in the electronic viewfinder for observation
Implementation Method 2
a first planar lens, wherein the observer is on the other side of the first planar lens
Data Source
AI summary
An electronic viewfinder is configured to magnify an image and provide adjustable diopter for different observers. The electronic viewfinder includes an aperture stop, a lens group totally with positive power, and a display. The components in the electronic viewfinder are arranged sequentially between the observer and the image. The lens group is utilized to enlarge the image, and the lens group includes a first lens with positive power and a second lens with negative power. The display is for showing the image. A first planar lens is disposed between the aperture stop and the lens group. A second planar lens may be disposed between the lens group and the display. A polarizer may be arranged between the second planar lens and the lens group.