Projector Lens Deformation Compensation via Real-Time Sensor Feedback
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Solution Overview
Problem
High-end projectors face image blurring due to lens deformation caused by thermal expansion and contraction, which is costly to mitigate with all-metal structures and full-glass lenses.
Innovation Solution
A focusing method and device that detects lens deformation using sensors and adjusts the focal length in real time, employing a piezoelectric film sensor and thermocouple sensor to accurately compensate for thermal effects without altering the projector's housing or lens material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an all-metal structure shell and full-glass lens are used, then lens deformation is reduced, but the cost of the projection system is greatly increased
Solution Approach 1:
The patent replaces the mechanical/structural approach (all-metal shell and full-glass lens) with a sensing and control approach. A deformation sensor detects lens deformation caused by thermal expansion, and this information is used to control the projection system to compensate for the deformation, thereby maintaining image quality without requiring expensive material changes.
Solution Approach 2:
The patent implements a feedback mechanism where a deformation sensor continuously monitors lens deformation and provides this information to a control system. The control system uses this feedback to adjust projection parameters or activate compensation mechanisms, creating a closed-loop system that maintains focus despite thermal deformation without requiring expensive structural changes.
2Duration of action of stationary object
If the lens operates for a long term, then thermal expansion and contraction cause lens deformation, but the image becomes blurred
Solution Approach 1:
The deformation sensor provides continuous feedback on lens deformation during operation, enabling the control system to compensate for thermal effects accumulated over time. This feedback loop maintains focus accuracy even during long-term operation when thermal expansion and contraction would otherwise cause blurring.
Solution Approach 2:
The deformation sensor detects lens deformation before it significantly impacts image quality. By detecting the deformation early (as a function of temperature), the system can take preliminary corrective action to maintain focus, preventing image blurring before it occurs during long-term operation.
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 lens defocusing, enhances projection resolution, and lowers material costs by maintaining existing projector components.
Implementation Method 1
The deformation sensor includes a piezoelectric film sensor
Implementation Method 2
the temperature sensor includes a thermocouple sensor
Implementation Method 3
The lens of the optical machine is more prone to thermal expansion and contraction, and thus a slight deformation thereof may occur
Data Source
AI summary
The disclosure provides a focusing method of optical machine of projector, a focusing device and an optical machine. The focusing method comprises steps of: detecting deformation amount of lens of an optical machine; and controlling and adjusting a focal length of the lens of the optical machine according to the deformation amount of the lens of the optical machine. In the he focusing method, by detecting the deformation amount of the lens of the optical machine in real time and controlling to adjust the focal length of the lens of the optical machine in real time according to the deformation amount of the lens of the optical machine, the adjustment precision of the focal length of the lens of the optical machine can be greatly improved.