Dual Gobo Wheel System for Simultaneous Focused Projection
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Solution Overview
Problem
Modern theatrical projection systems with fast lenses, which have low f-numbers and shallow depth of focus, cannot project two focused and overlapping gobo images simultaneously due to the inherent limitations of these lenses, preventing the creation of desirable dual-image effects.
Innovation Solution
The implementation of a dual gobo wheel system where two gobos with closely positioned, patterned surfaces are mounted in holders that allow for rotation via a central sun gear, enabling both gobos to be projected in focus and overlap, creating animated gobo effects by superimposing correlated opaque patterns and producing moiré effects when one pattern is rotated relative to the other.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a fast projection lens system with low f-number is used to deliver high light intensity, then illumination intensity is improved, but depth of focus becomes shallow, preventing two focused and overlapping gobo images from being projected simultaneously
Solution Approach 1:
The patent positions two gobo wheels at different distances from the projection lens, creating a third dimension in space. The first gobo wheel is positioned closer to the lens while the second gobo wheel is positioned farther away, allowing both to be in focus simultaneously despite the shallow depth of focus of fast lenses. This spatial separation in the depth dimension resolves the contradiction by enabling multiple focused images to coexist in the projection field.
Solution Approach 2:
The patent divides the gobo projection system into two separate gobo wheels, each capable of independent rotation and image projection. This segmentation allows each gobo wheel to be optimized for its specific positioning and focus plane, enabling the projection of multiple distinct images simultaneously without interfering with each other's focus quality.
2Manufacturing precision
If two gobo images are projected in focus simultaneously, then image clarity is improved, but the ability to create dynamic and animated effects is reduced
Solution Approach 1:
The patent implements independent rotational control for each gobo wheel, allowing dynamic adjustment of the projected images during operation. The first gobo wheel can rotate at different speeds and directions relative to the second gobo wheel, enabling the creation of animated effects such as moiré patterns while maintaining focus on both images. This dynamic capability resolves the contradiction by allowing simultaneous focus and animation.
Solution Approach 2:
The patent utilizes periodic rotation of the gobo wheels to create animated effects. By rotating the gobos at specific speeds and patterns, the system can generate moiré effects and other dynamic visual phenomena while maintaining sharp focus on both wheels. The periodic motion of the gobos creates the illusion of animation without compromising image clarity.
3Device complexity
If a single rotating gobo mechanism is used, then device complexity is reduced, but the ability to project multiple focused and overlapping images is limited
Solution Approach 1:
The patent combines two separate gobo wheels into a single integrated housing structure, allowing both wheels to be mounted and controlled within the same luminaire assembly. This merging approach enables the projection of multiple focused and overlapping images while keeping the overall device complexity manageable through unified mounting and control mechanisms.
Solution Approach 2:
The patent designs the gobo wheel housing to accommodate multiple gobo wheels with different rotational capabilities, making the system universally applicable for various projection effects. The same housing structure can support single or dual gobo configurations, allowing the system to adapt to different projection requirements without requiring completely separate mechanisms.
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
Enables the projection of two focused and overlapping gobo images, allowing for unique animated effects that were previously unattainable, while being compatible with existing rotating gobo mechanisms and capable of retrofitting existing automated spotlights.
Implementation Method 1
The gobo holder may be mounted on a ball bearing to allow the gobo to be rotated... The projection lens focuses the light output
Implementation Method 2
Another embodiment projects moiré effects created by superimposing two transparent layers containing correlated opaque patterns. When one of the patterns is rotated with respect to the other, a third pattern or set of patterns appears to move within the superimposed images
Data Source
AI summary
A gobo holder with two gobos that are rotatable one relative to the other. The gobos are located with their patterned surfaces facing one another and very close to one another so that both can be in focus at the same time.