Projection Optics Focus Control Using Range Feedback
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Solution Overview
Problem
Conventional methods for adjusting the focus of movable lighting fixtures in dynamic environments, such as theater stages, require extensive human intervention and high programming loads, especially when dealing with non-planar and complex projection surfaces.
Innovation Solution
A distance-measurement device attached to the lighting fixture measures the distance to the projection surface and transmits this data to a control entity, which determines focus parameter values for the projection optics, allowing automated adjustment of the lens positions to maintain focus without significant human intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If automated focus adjustment is implemented using distance measurement and control algorithms, then the programming load on operators is reduced and focus adjustment is simplified, but the device complexity increases due to additional sensors and control systems
Solution Approach 1:
The lighting fixture automatically adjusts its own focus by measuring the distance to the projection surface with a distance measurement device and using a control algorithm to determine the appropriate lens position. The system serves itself by eliminating the need for operator intervention in focus adjustment, reducing programming load while managing complexity through integrated automation.
Solution Approach 2:
The system uses a distance measurement device to continuously monitor the distance to the projection surface and feeds this information back to the control circuit, which then adjusts the lens position accordingly. This closed-loop feedback mechanism enables automatic focus maintenance without requiring complex manual programming.
2Device complexity
If manual focus adjustment methods are used, then the device complexity remains low, but the programming load on operators increases and human intervention is required
Solution Approach 1:
The lighting fixture automatically adjusts its own focus by measuring the distance to the projection surface with a distance measurement device and using a control algorithm to determine the appropriate lens position. The system serves itself by eliminating the need for operator intervention in focus adjustment, reducing programming load while managing complexity through integrated automation.
3Manufacturing precision
If focus adjustment is automated with distance measurement, then focus accuracy is improved and sharp edges are maintained, but the extent of automation increases requiring more sophisticated control systems
Solution Approach 1:
The system uses a distance measurement device to continuously monitor the distance to the projection surface and feeds this information back to the control circuit, which then adjusts the lens position accordingly. This closed-loop feedback mechanism enables automatic focus maintenance without requiring complex manual programming.
Solution Approach 2:
The control circuit changes the position parameter of the lens based on the measured distance to achieve optimal focus. By dynamically adjusting the lens position parameter according to distance variations, the system maintains sharp focus accuracy while using a relatively simple control approach.
Data Source
AI summary
A lighting system capable of providing automated focus assistance for a moving lighting fixture thereof. In one example, a distance-measurement device connected to the moving lighting fixture operates to measure a distance to the projection surface and transmits the measurement to an electronic controller. The electronic controller uses the measurement and a suitable algorithm to determine a focus parameter value for the projection optics. The determined focus parameter value is encoded in a control signal, which is then used to command a motor to move the corresponding component of the projection optics, thereby bringing and/or keeping in focus a pertinent edge of the illuminated area on the projection surface. An example method for automated focus assistance supports cue stack programming, single shot focus assistance, and continuous focus assistance.