Optical Fiber Scanner Recessed Core End Face
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Solution Overview
Problem
Existing optical fiber scanning technologies face challenges in reducing the spot size of emitted light, which limits the potential for higher image resolution in fiber scanning displays and endoscopes due to the size of pixel points.
Innovation Solution
An optical fiber scanner design featuring a recessed fiber core end face to create a negative focal power, allowing for reverse focusing of the light-emitting surface inside the fiber core, combined with projection objective lenses to focus and image this surface, resulting in a smaller pixel point size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the fiber core end face is made planar, then the structure is simple and easy to manufacture, but the spot size of emitted light is large which limits image resolution
Solution Approach 1:
The fiber core end face is designed with a recessed curved surface instead of a planar surface. This curvature creates a negative focal power that causes light to diverge in a controlled manner, effectively reducing the spot size of emitted light and improving image resolution without adding complex external optical components
Solution Approach 2:
The solution transitions from a two-dimensional planar end face to a three-dimensional recessed structure. By introducing depth dimension through the recessed surface, the patent achieves optical focusing effects that reduce spot size while maintaining manufacturing feasibility through standard fiber fabrication techniques
2Measurement precision
If the pixel point size is reduced to improve image resolution, then more pixels can be arranged closely, but the spot size of emitted light becomes smaller which is difficult to achieve with conventional optical fiber structures
Solution Approach 1:
The patent changes the geometric parameters of the fiber core end face by creating a recessed structure with specific depth and radius of curvature. This parameter modification alters the light emission characteristics, reducing the spot size to enable higher pixel density arrangements and improved image resolution
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 size of the pixel points, enhancing image resolution and enabling higher-density pixel arrangements, thereby improving the imaging quality and brightness in optical fiber scanning applications.
Implementation Method 1
a fiber core end face of the optical fiber cantilever is recessed inwardly to form a negative focal power, such that an equivalent light-emitting surface of the fiber core end face is focused reversely inside the fiber core
Implementation Method 2
the equivalent light-emitting surface of the fiber core end face is focused reversely inside the fiber core
Data Source
AI summary
Disclosed are an optical fiber scanner and a projection apparatus. The optical fiber scanner comprises a housing, an optical fiber enclosed in the housing, an actuator, and projection objective lenses, wherein the optical fiber comprises a fiber core and an inner cladding; the optical fiber is fixed on the actuator, one end of the optical fiber extends beyond the actuator to form an optical fiber cantilever, and a fiber core end face of the optical fiber cantilever is recessed inwards to form a negative focal power, such that an equivalent light-emitting surface of the fiber core end face is reversely focused in the fiber core; and the projection objective lenses are arranged on a light-emitting path of the optical fiber cantilever and are used for focusing and imaging the equivalent light-emitting surface (6).