Projection Lens Structure with Segmented Groups for Image Quality
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Solution Overview
Problem
Conventional projectors face challenges in maintaining image quality due to the trade-off between focal length and field of view, where longer focal lengths result in a narrower angle of view and shorter focal lengths lead to image distortion, making it difficult to achieve efficient projection while ensuring image quality.
Innovation Solution
A projection lens structure comprising a combination of a long-focus lens and a short-focus lens, with specific optical elements such as plastic aspheric lenses and triplet lenses, and an aperture stop to enhance image quality while maintaining a simple structure and low manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the focal length is increased to improve image quality, then the angle of view becomes narrower
Solution Approach 1:
The projection lens is divided into two separate lens groups: a first lens group forming a long-focus lens (focal length 30-80mm) and a second lens group forming a short-focus lens (focal length 20-30mm). This segmentation allows the system to switch between different focal lengths for different application scenarios, resolving the contradiction between image quality and angle of view by providing both optical configurations within a single device.
2Area of moving object
If the focal length is decreased to widen the angle of view, then image distortion increases
Solution Approach 1:
The projection lens is divided into two separate lens groups: a first lens group forming a long-focus lens (focal length 30-80mm) and a second lens group forming a short-focus lens (focal length 20-30mm). This segmentation allows the system to switch between different focal lengths for different application scenarios, resolving the contradiction between image quality and angle of view by providing both optical configurations within a single device.
Solution Approach 2:
The lens groups employ aspheric lens surfaces to correct optical aberrations and reduce image distortion. The aspheric design allows the short-focus lens to achieve a wider angle of view while maintaining image quality by compensating for distortion through the curved surface geometry.
3Ease of manufacture
If the projector structure is simplified to reduce manufacturing cost, then image quality deteriorates
Solution Approach 1:
The projection lens is divided into two separate lens groups: a first lens group forming a long-focus lens (focal length 30-80mm) and a second lens group forming a short-focus lens (focal length 20-30mm). This segmentation allows the system to switch between different focal lengths for different application scenarios, resolving the contradiction between image quality and angle of view by providing both optical configurations within a single device.
Solution Approach 2:
The projection lens structure incorporates both long-focus and short-focus lens groups within a single device, enabling it to perform multiple functions: high-quality detailed projection with the long-focus lens and wide-angle projection with the short-focus lens. This multi-functionality allows a single projector to serve multiple application scenarios without requiring multiple separate devices, thereby reducing overall manufacturing costs while maintaining image quality.
4Illumination intensity
If the aperture stop is increased to improve light gathering, then depth of field decreases
Solution Approach 1:
The projection lens structure includes an aperture stop that can be dynamically adjusted to different opening sizes. The aperture stop is configured with specific f-numbers (f/1.6-f/2.0) to optimize the balance between light gathering capability and depth of field control, allowing the system to adapt to different projection requirements by adjusting the aperture opening.
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 proposed structure achieves high-quality images with a large aperture stop, allowing for efficient projection with improved resolution from 1080P to 4K2K, while maintaining a simple structure and low manufacturing costs.
Implementation Method 1
a first group of lens (G1), an aperture stop (S) and a second group of lens (G2)... forming a long-focus lens with a focal length between 30～80 mm... forming a short-focus lens with a focal length between 20～30 mm
Data Source
AI summary
A projection lens structure includes a first group of lens, an aperture stop and a second group of lend. The aperture stop is arranged at a rear of the first group of lens to form a long-focus lens with a focal length between 30-80 mm and the second group of lens is arranged at a rear of the aperture stop to form a short-focus lens with a focal length between 20-30 mm. With the long-focus lens and the short-focus lens operated correspondingly, the structure of the projection lens is simple and the manufacturing cost is low without affecting the quality of produced images.