Projector Casing Positioning Mark for Lens Center Alignment
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Solution Overview
Problem
The installation of projectors, especially those with ultrashort focus reflective lenses, is challenging due to the difficulty in determining the lens center, leading to potential misalignment with the projection screen, which affects imaging quality and often requires costly lens shift functions or keystone correction that can degrade image quality.
Innovation Solution
Incorporating positioning marks on the projector casing to align the imaging center of the optical image with the projection screen's center, either through visual alignment marks or a laser emitter to project a laser mark, facilitating correct installation without the need for costly lens shift functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the ultrashort focus reflective lens is embedded in the casing, then the projector structure is more compact, but it becomes difficult for installation personnel to determine the center position of the lens
Solution Approach 1:
The patent introduces positioning marks as an intermediary element between the embedded lens and the installation personnel. These marks are provided on the casing and correspond to the lens center position, serving as a mediator that translates the hidden lens position into visible alignment references, thereby solving the difficulty of determining lens center position while maintaining the compact embedded structure
Solution Approach 2:
The positioning marks on the casing are essentially copies or representations of the lens center position. Instead of directly exposing the lens, the patent creates visual copies (marks) that indicate the lens center location, allowing installation personnel to align the projector without needing to see or access the actual lens
2Adaptability or versatility
If lens shift function is added to correct installation misalignment, then the projector can be installed more flexibly, but the overall cost increases and the function is only available on high-end projectors
Solution Approach 1:
The patent applies preliminary action by providing positioning marks during the manufacturing process that guide correct installation before the projector is even deployed. This pre-built guidance system eliminates the need for post-installation correction mechanisms like lens shift, achieving installation flexibility through advance preparation rather than complex adjustable components
Solution Approach 2:
The positioning marks represent a simple, low-cost solution compared to expensive lens shift mechanisms. Instead of incorporating complex mechanical or optical adjustment systems, the patent uses simple visual markers that provide the necessary installation guidance at minimal cost, making the feature accessible to non high-end projectors
3Ease of operation
If keystone correction is used to fix incorrect installation, then the projector can compensate for misalignment, but it generates a jagged screen and affects the imaging quality
Solution Approach 1:
The patent applies preliminary anti-action by preventing incorrect installation in the first place through positioning marks that guide proper alignment. Instead of allowing misalignment and then correcting it with keystone correction (which degrades image quality), the marks proactively prevent the problem from occurring, maintaining both ease of operation and imaging quality
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
Enhances installation convenience by allowing users to accurately align the projector's imaging center with the projection screen, improving imaging quality and reducing the risk of incorrect installation, thereby maintaining image quality without the need for expensive lens shift corrections.
Implementation Method 1
The laser emitter is configured to form a laser mark on a projection screen
Data Source
AI summary
A projector including an optical machine, a lens and a casing is provided. The optical machine is configured to form an optical image. The lens is located on a projection path of the optical machine so that the optical image is projected on the lens. The casing is configured to receive the optical machine and the lens. The casing is provided with a positioning mark, which is aligned with an imaging center of the optical image in a vertical direction and configured to align the imaging center of the optical image with a center of a projection screen.