Detachable Converter Lens Gap Adjustment for Video Projection
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Solution Overview
Problem
Existing video projection devices face challenges with focus position shifts and aberration deterioration when using converter lenses, requiring complex operations and structures for accurate alignment and switching.
Innovation Solution
A video projection device with a detachable afocal converter lens and a gap adjustment mechanism that sets the lens gap according to the projection distance and type of projection lens, allowing for easy conversion of magnification without complicated operations or structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an internal converter lens or rear converter lens is used, then converter function is achieved, but the optical system becomes large-scaled and increases manufacturing complexity and costs
Solution Approach 1:
The converter lens is extracted from the internal/rear position and placed at the front of the projection lens. This extraction allows the converter function to be achieved while keeping the main optical system compact and simple, as the converter lens operates independently in front of the projection lens rather than being integrated into the complex internal optical path.
Solution Approach 2:
The front converter lens acts as an intermediary optical element between the light source and the projection lens. This intermediary position allows it to perform magnification conversion without requiring modifications to the main projection optical system, thereby maintaining system simplicity while achieving adaptability.
2Ease of operation
If a front converter lens is used, then switching operation is simplified, but focus position shifts occur when the lens is attached or detached
Solution Approach 1:
The converter lens is designed with a movable structure that allows dynamic adjustment of its position relative to the projection lens. This dynamic positioning capability enables the system to maintain focus accuracy across different attachment states while keeping the switching operation simple and straightforward.
Solution Approach 2:
The gap between the converter lens and projection lens is adjusted as a controllable parameter to compensate for focus position shifts. By changing this gap parameter, the system maintains optimal focus accuracy whether the converter lens is attached or detached, thereby resolving the contradiction between operational simplicity and focus precision.
3Manufacturing precision
If a focus mechanism is added to the converter lens for correcting focus position, then focus accuracy is improved, but the structure becomes complicated and costs increase
Solution Approach 1:
The projection lens's existing focus mechanism is designed to serve dual functions: focusing the projection lens itself and compensating for focus position shifts caused by the converter lens attachment. This multi-functionality eliminates the need for a separate focus mechanism in the converter lens, maintaining focus accuracy while avoiding structural complication.
Solution Approach 2:
The focus control functions of the projection lens and the converter lens are merged into a single integrated system. By combining these functions, the patent achieves accurate focus control without requiring separate, complex focus mechanisms for each component, thereby reducing overall structural complexity.
4Manufacturing precision
If multiple cylindrical lenses are used in the converter lens for focus correction, then focus accuracy is improved, but the structure becomes complicated and costs increase
Solution Approach 1:
Instead of using multiple cylindrical lenses to correct focus, the patent achieves focus accuracy by precisely controlling the gap parameter between the converter lens and projection lens. This parameter-based approach simplifies the structure while maintaining or improving focus accuracy compared to using multiple complex lens elements.
Solution Approach 2:
The patent extracts the focus correction function from the converter lens structure itself and relocates it to the gap adjustment mechanism between the converter lens and projection lens. This extraction eliminates the need for complex internal structures within the converter lens while achieving the same focus correction effect.
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
Prevents focus position shifts and aberration deterioration during lens attachment and detachment, maintaining optimal video characteristics and reducing operational complexity and costs.
Implementation Method 1
a converter lens (4) which is composed of a plurality of lenses and is afocal as a whole
Implementation Method 2
converter lens (4) which is composed of a plurality of lenses
Data Source
AI summary
A video projection device has one of a plurality of types of projection lenses replaceably loaded and projects a video on a screen at a fixed position. The video projection device includes: a converter lens which is composed of a plurality of lenses, which is afocal as a whole, and which is detachably provided in front of the projection lens to convert projection magnification; and a gap adjustment mechanism changing a predetermined gap in the converter lens to a setting in accordance with at least one of a projection distance to the screen and the type of the projection lens loaded.