Projection Lens Module with Segmented Groups for Wide-Angle Imaging
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Solution Overview
Problem
Projection lens modules with limited wide-angle capabilities result in projected images with restricted adjustable sizes and suboptimal resolution, especially when used in confined spaces.
Innovation Solution
A projection display apparatus comprising a light source module, optical engine module, and a projection lens module with two lens groups having specific refractive powers and adjustable distances, allowing for a wider angle and improved imaging quality for images of various sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a projection lens module with limited wide-angle capability is used, then the device can be simpler and more compact, but the projected image size adjustment range is restricted and resolution deteriorates
Solution Approach 1:
The projection lens module is divided into two distinct lens groups: a first lens group with negative refractive power and a second lens group with positive refractive power. This segmentation allows each group to perform specific optical functions, enabling wide-angle projection and flexible image size adjustment while maintaining a relatively compact structure.
Solution Approach 2:
The patent implements adjustable distances between the first lens group and the second lens group, as well as adjustable distances from each lens group to the imaging end. This dynamic configuration allows the system to adapt to different projection requirements, achieving versatile image size adjustment without requiring a completely complex lens structure.
2Area of moving object
If the projection lens module is designed for large-size projection, then image coverage is improved, but resolution deteriorates in the patent
Solution Approach 1:
The first lens group is specifically designed with negative refractive power to handle wide-angle light rays and provide overall image coverage, while the second lens group with positive refractive power focuses on maintaining image quality and resolution. This local quality differentiation allows the system to achieve both large projection size and acceptable resolution.
Solution Approach 2:
By allowing adjustable distances between the lens groups and from the lens groups to the imaging end, the system can dynamically optimize the optical path for different projection sizes. This dynamic adjustment capability enables the maintenance of image resolution across various projection areas.
3Adaptability or versatility
If a wide-angle projection lens module is designed, then the projected image coverage is improved, but the device complexity increases
Solution Approach 1:
The lens module is segmented into two functional groups with opposite refractive powers. The first lens group with negative refractive power specifically addresses the wide-angle requirement by diverging light rays appropriately, while the second lens group with positive refractive power corrects optical aberrations and focuses the image. This segmentation achieves wide-angle capability without requiring a single complex lens element.
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 solution enables the projection of clear, high-resolution images across a wide range of sizes, from small to large, by utilizing a configuration of lenses with negative, positive, and aspherical refractive powers, ensuring improved imaging quality and adaptability.
Implementation Method 1
The first lens group includes a first lens, a second lens and a third lens, which are sequentially disposed from the screen end to the imaging end and have negative, negative and positive refractive powers, respectively
Implementation Method 2
The second lens group includes a fourth lens, a fifth lens and a sixth lens, which are sequentially disposed from the screen end to the imaging end and have negative, positive and positive refractive powers, respectively
Implementation Method 3
The light valve is configured to convert the light beam emitted from the prism into an image beam
Data Source
AI summary
A projection display apparatus includes a light source module, an optical engine module and a projection lens module. The optical engine module includes a prism and a light valve. The projection lens module includes a first lens group and a second lens group. The first lens group is disposed between the screen end and the imaging end. The first lens group includes a first lens, a second lens and a third lens, which are sequentially disposed from the screen end to the imaging end and have negative, negative and positive refractive powers, respectively. The second lens group is disposed between the first lens group and the imaging end and has a positive refractive power. The second lens group includes a fourth lens, a fifth lens and a sixth lens, which are sequentially disposed from the screen end to the imaging end and have negative, positive and positive refractive powers, respectively.