Projector Focus Adjustment Range Segmentation
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Solution Overview
Problem
Conventional projectors require a wide mechanical range for focus adjustment, leading to prolonged automatic focus adjustment times due to the need for extensive mechanical movement, which is inefficient and time-consuming.
Innovation Solution
A projector design that narrows the focus adjustment range in automatic control to rapidly determine the in-focus position by setting the variable range within the mechanical limit range, allowing for quicker focus adjustment and maintaining a wide range for manual control, thereby improving user convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mechanical limit range is set wide to accommodate focus adjustment margin and manufacturing errors, then the reliability is improved, but the focus adjustment time increases
Solution Approach 1:
The patent divides the mechanical limit range into two distinct ranges: a first range for automatic adjustment control and a second range for manual adjustment control. The first range is narrower and optimized for rapid automatic focus adjustment, while the second range is wider and provides margin for manufacturing errors and manual operation flexibility. This segmentation allows the system to use different control strategies for different operational contexts, resolving the contradiction between speed and reliability.
Solution Approach 2:
The patent implements dynamic range selection based on the operational mode. When automatic adjustment control is active, the system uses the narrower first range to minimize adjustment time. When manual adjustment control is active, the system accesses the wider second range to ensure adequate focus coverage. This dynamic adaptation allows the system to optimize performance for each control mode, achieving both fast automatic adjustment and reliable manual operation.
2Productivity
If the variable range in automatic adjustment control is set narrow to reduce adjustment time, then the productivity is improved, but the adaptability decreases
Solution Approach 1:
The patent creates a multi-functional focus adjustment system where two different variable ranges serve different purposes. The narrower first variable range is optimized for automatic adjustment operations, providing fast response and high productivity. The wider second variable range is optimized for manual adjustment operations, providing broad adaptability and coverage for various projection distances and screen positions. By making the system capable of switching between these two ranges based on control mode, it achieves both high productivity in automatic mode and high adaptability in manual mode.
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
This approach significantly reduces focus adjustment time in automatic control while ensuring a wide focus range for manual adjustment, enhancing operational efficiency and user experience.
Implementation Method 1
a light modulating device which modulates light beams emitted from a light source according to image information to form an optical image
Implementation Method 2
a projection lens which has a plurality of lenses and enlarges and projects the optical image onto a screen by means of the plurality of lenses
Data Source
AI summary
A projector comprising a light modulating device which modulates light beams emitted from a light source, according to image information, to form an optical image; a projection optical device, the projection optical device including a projection lens, which has a plurality of lenses, that enlarges and projects the optical image onto the screen; a focal position changing unit, to perform focus adjustment on the image; a setting input unit through which automatic adjustment information for changing the focal position to an in-focus position where the projected image is in an in-focus state is input; and a focus adjustment control unit which controls the focal position changing unit until the projected image is in the in-focus state.