Zoom Lens with Movable Groups for Stage Lighting
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Solution Overview
Problem
Current zoom lenses for stage lighting and photographic camera applications are costly due to the large number of lenses required, which compromises image quality.
Innovation Solution
A lamp with a zoom lens configuration comprising a rear fixed group, a zooming group, a compensating group, and a front fixed group, where the zooming and compensating groups move along the optical axis to achieve zooming, reducing the number of lenses and maintaining high image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a zoom lens uses a large number of lenses, then image quality is improved, but cost increases significantly
Solution Approach 1:
The zoom lens is divided into four functional groups (rear fixed group, zooming group, compensating group, front fixed group) with specific lens elements in each group. This segmentation allows optimization of each group's function while reducing the total number of lenses needed compared to traditional designs.
Solution Approach 2:
The zooming group and compensating group serve multiple functions simultaneously - the zooming group changes focal length while the compensating group maintains image plane stability. This multi-functionality reduces the need for additional dedicated lenses for each function.
2Device complexity
If a zoom lens uses a small number of lenses, then cost is reduced, but image quality deteriorates
Solution Approach 1:
Different lens elements are assigned specific local functions with optimized properties - the rear fixed group provides initial collimation, the zooming group provides variable magnification, the compensating group provides image plane stabilization, and the front fixed group provides final focusing. Each element's local quality is optimized for its specific function.
Solution Approach 2:
The lens parameters (focal lengths, distances between groups) are specifically optimized to achieve high image quality with fewer elements. The patent specifies focal length relationships and distance ranges that maximize optical performance while minimizing lens count.
3Device complexity
If a prime lens is used, then the structure is simple and cost is low, but zooming capability is lost
Solution Approach 1:
The lens system transitions from a static prime lens configuration to a dynamic zoom lens configuration by making the zooming group and compensating group movable along the optical axis. This allows the system to adapt its focal length while maintaining a relatively simple overall structure.
Solution Approach 2:
The movable zooming and compensating groups are nested within the lens barrel structure, allowing them to move along the optical axis without significantly increasing the overall lens diameter or complexity. The groups are positioned and constrained within the existing lens housing.
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
The solution effectively reduces the cost of the zoom lens while maintaining high image quality by minimizing the number of lenses and improving the convenience and efficiency of zoom control, thereby lowering the overall cost of the lamp.
Implementation Method 1
the lamp realizes zooming by movement of the zooming group and the compensating group included in the zoom lens in the direction of the optical axis
Data Source
AI summary
The invention discloses a lamp with a zoom lens, which comprises the zoom lens and a lamp body, the lamp body is connected with the zoom lens, the zoom lens comprises: a rear fixed group, comprising a first biconvex lens; a zooming group, comprising a first concave-convex meniscus lens and a plano-convex lens; a compensating group, comprising a biconcave meniscus lens and a second concave-convex meniscus lens; and a front fixed group, comprising a second biconvex lens. The four groups are sequentially arranged in the direction of an optical axis; and the lamp realizes zooming by movement of the zooming group and the compensating group in the direction of the optical axis. A change of a pattern or a beam size is realized; the number of lenses is reduced; zooming of the zoom lens is realized only by movement of the zooming group and the compensating group.