Thread Transmission Structure for Spotlight Beam Angle Adjustment
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Solution Overview
Problem
Conventional spotlights with adjustable focal length often have low transmission efficiency and inconvenient operation due to fixed structures and lack of high positioning stability, especially when converting rotational motion into linear motion for beam angle adjustment.
Innovation Solution
A thread transmission structure with a sliding element and a rotation adjustment ring, where the rotation adjustment ring is coupled to the sliding element by trapezoidal or rectangular threads, allowing for efficient conversion of rotational motion into linear motion to adjust the distance between light emitting assemblies and lenses, thereby adjusting the beam angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed structure is used for spotlight components, then the structure is simple and stable, but the beam angle cannot be adjusted
Solution Approach 1:
The patent implements a dynamic adjustment mechanism where the reflector can rotate relative to the light source along a circular arc trajectory. This allows the spotlight to transition from a fixed structure to a dynamically adjustable one, enabling beam angle variation while maintaining structural simplicity through a single degree of freedom rotation mechanism.
Solution Approach 2:
The spotlight is divided into separable modules: a light source assembly, a reflector assembly, and a housing. The reflector assembly can be independently rotated relative to the light source, allowing the beam angle to be adjusted without moving the entire spotlight structure. This segmentation enables localized adjustment while keeping the overall structure simple.
2Adaptability or versatility
If the distance between light source and reflector is fixed, then the structure is stable, but the focal length cannot be adjusted
Solution Approach 1:
The distance between the light source and reflector is made dynamically adjustable through a rotation mechanism. As the reflector rotates along a circular arc, the radial distance from the light source changes, thereby adjusting the focal length. This dynamic adjustment is achieved through a simple rotational motion rather than a complex linear translation mechanism.
Solution Approach 2:
The light source is positioned at the center of rotation of the reflector, creating a nested configuration where the rotation occurs around a central point. This nesting allows the reflector to rotate while maintaining a compact structure, adjusting the focal length without requiring additional space or complex mechanisms outside the housing.
3Productivity
If a thread transmission structure is used to convert rotational motion to linear motion, then the transmission efficiency is high, but the structure becomes more complex
Solution Approach 1:
The patent replaces a traditional thread transmission mechanism with a direct rotation mechanism. Instead of converting rotational motion to linear motion through threads, the reflector rotates directly along a circular arc, and the focal length adjustment is achieved through the radial component of this rotation. This substitution eliminates the need for thread structures while maintaining high transmission efficiency through direct mechanical coupling.
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 thread transmission structure achieves high transmission efficiency and maintains a stationary spotlight shape with stable positioning, allowing for a significant adjustment range of the beam angle from 8° to 40°, enhancing operational convenience and focal length adjustment.
Implementation Method 1
The rotation adjustment ring may include an internal thread, the sliding element may include an external thread. The sliding element may include a plurality of thread segments spaced along a circumferential direction, and the plurality of thread segments may form at least one round of interrupted external thread. A thread form of the internal thread and the external thread may be trapezoidal or rectangular, and the rotation adjustment ring is rotatable relative to the sliding element to push the sliding element to slide in an axial direction.
Data Source
AI summary
The present disclosure discloses a thread transmission structure, and an optical system and a spotlight using the transmission structure. The thread transmission structure includes a sliding element and a rotation adjustment ring sleeved on an outer ring of the sliding element, the rotation adjustment ring being sleeved on an outer side of the sliding element and coupled to the sliding element, the rotation adjustment ring includes an internal thread, the sliding element includes an external thread, the sliding element includes a plurality of thread segments spaced along a circumferential direction, the plurality of thread segments forming at least one round of interrupted external thread, a thread form of the internal thread and the external thread being trapezoidal or rectangular, and the rotation adjustment ring being rotatable relative to the sliding element to push the sliding element to slide in an axial direction.