Projection Lens Calibration via Offset Compensation
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Solution Overview
Problem
Existing projection systems face challenges in maintaining image quality across wide and tele modes due to lens position shifts caused by structural tolerances, leading to dark corners and reduced image quality, and current solutions to mitigate this increase costs and reduce yield rates.
Innovation Solution
A projection apparatus and calibration method that includes a lens module, movement element, sensing element, and lens control element, which adjusts movement parameter values based on detected offsets between positions in wide and tele modes to maintain focus on a single position on the reference plane, preventing lens position shifts and ensuring consistent image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If component tolerance and assembly tolerance are limited to improve accuracy of lens shift module components, then manufacturing precision is improved, but productivity decreases and cost increases
Solution Approach 1:
The patent applies preliminary action by performing offset detection and compensation before final product delivery. The lens shift module pre-detects the offset between wide mode and tele mode imaging origins using a sensing element, stores offset information, and applies compensation algorithms in advance. This allows standard tolerance components to be used while still achieving accurate multi-mode imaging, resolving the contradiction between manufacturing precision and productivity.
Solution Approach 2:
The patent implements feedback through a closed-loop system where the sensing element continuously monitors lens module position and imaging origin offset. The detected offset information feeds back to the control element, which adjusts movement parameter values to compensate for tolerances. This feedback mechanism enables standard-tolerance components to achieve precision performance, eliminating the need for expensive tight-tolerance manufacturing.
2Manufacturing precision
If component tolerance and assembly tolerance are limited to improve accuracy of lens shift module components, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The lens shift module applies self-service by autonomously detecting and compensating for its own manufacturing tolerances. The sensing element on the lens module detects the offset, and the control element automatically calculates and applies compensation without external intervention. This self-calibrating capability eliminates the need for complex manual assembly procedures and specialized tooling, reducing assembly difficulty while maintaining precision.
3Manufacturing precision
If lens position is adjusted to maintain focus in wide mode and tele mode, then image quality is improved, but lens position stability deteriorates due to structural tolerances
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting movement parameter values based on detected offset. The control element modifies the position parameters for wide mode and tele mode operations to compensate for manufacturing tolerances. This parameter adjustment maintains consistent imaging origin alignment across modes while accommodating standard-tolerance components, resolving the contradiction between focus accuracy and position stability.
Data Source
AI summary
A projection apparatus is provided, including a lens module, a movement element, a sensing element, and a lens control element. When the lens module moves to the origin position, the lens control element controls an image beam to focus on a first position on a reference plane in one of the tele mode and the wide mode, the lens control element controls the image beam to focus on a second position on the reference plane in the other mode, and the lens control element determines whether there is an offset between the first position and the second position. When the offset exists, the lens control element adjusts a movement parameter value of the movement element based on the offset value between the first position and the second position, so that the image beam is focused on the same position on the reference plane in the tele mode and wide mode.