LED Collimator Light Guide with Mirror-Finished Conical Through-Hole
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Solution Overview
Problem
Conventional light source devices for collimators in X-ray equipment, such as those using halogen lamps or LEDs with compound parabolic condensers, face challenges in achieving a high illuminance ratio between the inner and outer regions of the visible light radiation field, leading to difficulties in accurately recognizing the X-ray radiation field.
Innovation Solution
A light source device for a collimator that incorporates an LED and a visible light guide member with a through-hole having a mirror-finished conical or pyramidal surface, where the first opening is smaller than the LED's light emitting surface, and a light-tight structure to concentrate visible light, enhancing the illuminance ratio between inner and outer regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If all visible lights from LEDs are condensed by the reflecting surface of a compound parabolic condenser, then the illuminance in the visible light radiation field is improved, but the illuminance ratio between the inside and outside of the radiation field cannot exceed a certain level
Solution Approach 1:
The patent divides the light guiding function into two separate components: a compound parabolic condenser (CPC) for condensing light and a separate light guide member with a through-hole for shaping and directing the light. This segmentation allows each component to optimize its specific function, with the light guide member's through-hole configuration enabling better control over the radiation field boundaries and improving the illuminance ratio.
Solution Approach 2:
The light guide member acts as an intermediary between the LED light source and the final radiation field. It receives the light from the CPC, processes it through its through-hole structure, and outputs a optimized radiation field with improved illuminance ratio. The light guide member mediates the transition from general light condensation to directed radiation field formation.
2Illumination intensity
If a halogen lamp is used as the visible light source, then the radiation field can be visualized, but the power consumption is large and the lifetime is short
Solution Approach 1:
The patent replaces the halogen lamp with an LED, which has longer lifetime and lower power consumption. While LEDs are technically shorter-lived than some traditional lamps, their extended operational life and energy efficiency make them the superior choice for this application, eliminating the need for frequent replacements and reducing energy consumption.
3Quantity of substance
If the first opening of the through-hole has a larger area, then more light can pass through, but the illuminance ratio between inside and outside radiation field decreases
Solution Approach 1:
The patent optimizes the geometric parameters of the through-hole, specifically the area ratio between the first opening (LED side) and the second opening (opposite side). By controlling this area ratio and the depth of the through-hole, the system achieves the optimal balance between light transmission quantity and illuminance ratio, maximizing the visual contrast between the radiation field interior and exterior.
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 significantly improves the illuminance ratio between the inner and outer regions of the visible light radiation field, allowing for more accurate recognition of the X-ray radiation field and preventing stray light, while also managing heat generated by high power LEDs.
Implementation Method 1
The side surface of the through-hole is formed in a mirror surface reflecting the visible light
Implementation Method 2
a visible light guide member configured to condense the visible light irradiated from the LED after limiting a radiation range
Data Source
AI summary
Provided is a light source device for a collimator capable of improving an illuminance ratio in an inside of a visible light's radiation field to an outside thereof. The light source device for a collimator includes an LED with a light emitting portion that irradiates visible light and a visible light guide member. The visible light guide member may have a main body, a spacer, and a base. In the main body, a through-hole of a truncated conical shape is formed. The through-hole of a truncated cone shape forms a first opening at a first surface of the main body on a side of the LED and a second opening a second surface of the main body opposite to the first surface. The first opening may be smaller than the second opening. The conical surface of the through-hole having the truncated conical shape is formed as a mirror surface which reflects the visible light irradiated from the LED with high reflectance.