Anode Tip Geometry for Discharge Lamp Noise Suppression
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Solution Overview
Problem
Short arc type discharge lamps used in medical equipment, such as endoscopes, generate radiation noise during operation, which is undesirable due to the demand for miniaturization and the limitations of existing shielding solutions.
Innovation Solution
The design of the anode tip with a tapering portion and a flat tip portion, where the outer diameter of the flat tip is smaller than the cathode rod portion and the anode body portion is larger than the cathode rod portion, maintains a high temperature at the anode tip, reducing radiation noise by controlling thermal diffusion and heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shield member is employed to block radiation noise, then radiation noise shielding is improved, but device complexity and size increase
Solution Approach 1:
The invention converts the harmful radiation noise generation into a beneficial effect by controlling the anode tip temperature. By designing the anode tip with specific dimensions (smaller outer diameter) and material properties, the temperature is maintained at a level that suppresses radiation noise generation at its source, rather than trying to block it with additional shielding components.
Solution Approach 2:
The invention extracts and addresses the root cause of radiation noise (anode tip temperature) separately from the main lamp structure. By focusing on the anode tip portion and controlling its thermal characteristics independently through dimensional design, the solution eliminates the need for additional shielding members that would add complexity to the overall device.
2Object-generated harmful factors
If the anode tip temperature is reduced to suppress radiation noise, then radiation noise generation is improved, but light intensity decreases
Solution Approach 1:
The invention applies local quality control by making only the anode tip portion (the specific location where radiation noise is generated) have a smaller outer diameter, while the rest of the anode structure maintains sufficient mass. This localized dimensional control suppresses radiation noise at the tip while preserving the overall thermal mass needed to maintain light intensity through proper thermal management.
Solution Approach 2:
The invention changes the physical parameters of the anode tip, specifically its outer diameter and dimensional ratios relative to the cathode rod. By optimizing these parameters, the anode tip temperature is controlled to suppress radiation noise while the overall lamp performance and light intensity are maintained through the balanced design of the electrode structure.
3Illumination intensity
If the anode tip temperature is increased to improve light intensity, then light intensity is improved, but radiation noise generation increases
Solution Approach 1:
The invention addresses the temperature conflict by introducing dimensional control in the radial direction (outer diameter of anode tip) rather than solely relying on axial length or power input. By controlling the cross-sectional dimensions of the anode tip, the invention independently manages thermal characteristics to suppress radiation noise while maintaining the thermal mass needed for sufficient light intensity.
4Ease of manufacture
If the anode structure is simplified for ease of manufacture, then ease of manufacture is improved, but temperature control capability decreases
Solution Approach 1:
The invention segments the anode structure into distinct portions with different functional requirements: the anode tip portion (for radiation noise suppression through smaller diameter), the anode body portion (for structural support and electrical conduction), and the connection portion (for joining to the lamp structure). This segmentation allows each part to be optimized independently, maintaining temperature control capability while facilitating manufacturing through modular construction.
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
This configuration effectively suppresses radiation noise generation by maintaining the anode tip at a higher temperature, lowering the threshold current required to eliminate noise and increasing light intensity by up to 20%.
Implementation Method 1
a body member (1) made from an insulating member, includes an electrical discharge space and a concave portion that forms the outer bounder of the electrical discharge space and a curved reflective face
Implementation Method 2
a pair of an anode (5) and a cathode (4) that is arranged in the electrical discharge space and form a gap therebetween
Implementation Method 3
short arc type discharge lamp
Implementation Method 4
the incidence rate of such a radiation noise relates to the temperature of the tip of an anode. Specifically, the inventors found that when the temperature of the tip of anode is comparatively low, generation of such a radiation noise decreases remarkably
Data Source
AI summary
A short arc type discharge lamp that includes a body member a light permeable member a pair of an anode and a cathode. The pair of the anode and cathode is arranged with a gap at a focal position of the reflective face. The cathode has a cathode tip portion that is approximately conic and a cathode rod portion. The anode has an anode tip portion that has a tapering portion and a flat tip end portion. Further, an outer diameter of the tip of the anode flat tip end portion is smaller than the outer diameter of the cathode rod portion, and an outer diameter of a back end of the anode tip portion is larger than that of the cathode rod portion.