Lighting Apparatus Temperature Measurement Without Optical Path Blockage
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Solution Overview
Problem
Existing lighting apparatuses face challenges in accurately measuring the temperature of optical members that transmit light without obstructing the optical path, which is crucial for maintaining optimal performance and preventing overheating.
Innovation Solution
A lighting apparatus that includes a light source, an optical member, a temperature measuring section to measure a first point, and a storing section with profile information to determine the temperature of a second point on the optical member, allowing for accurate temperature measurement without blocking the light path by using an infrared radiant thermometer positioned outside the optical path and employing a thermal conductivity-based arithmetic expression to calculate the temperature of the center portion of the Fresnel lens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a contact temperature sensor is used to measure the temperature of the optical member, then the temperature can be measured directly, but the optical path is blocked and the movable range of the flash generator is limited
Solution Approach 1:
The patent replaces the contact temperature sensor (mechanical contact method) with an infrared sensor that detects temperature through infrared radiation. This substitution eliminates the need for physical contact between the sensor and optical member, allowing the flash generator to move freely without being constrained by sensor positioning requirements.
Solution Approach 2:
The patent introduces infrared radiation as an intermediary medium to transfer temperature information from the optical member to the sensor. The infrared sensor detects the infrared radiation emitted by the optical member, which carries temperature information, thereby measuring temperature without direct contact or blocking the optical path.
2Measurement precision
If a temperature sensor is positioned to measure the center portion of the Fresnel lens, then the most critical temperature point is detected, but the optical path is blocked
Solution Approach 1:
The patent replaces direct contact measurement at the center point with infrared radiation detection. The infrared sensor can detect the temperature at the center portion of the Fresnel lens by receiving infrared radiation from that location without requiring physical contact or blocking the optical path with the sensor itself.
Solution Approach 2:
The patent transitions from a one-dimensional contact measurement approach to a three-dimensional infrared detection approach. The infrared sensor measures temperature remotely by detecting radiation in the infrared spectrum, adding a new dimensional approach to temperature measurement that avoids the limitations of contact sensors.
3Reliability
If the temperature sensor is placed outside the optical path, then the optical path integrity is maintained, but direct temperature measurement of the optical member becomes difficult
Solution Approach 1:
The patent uses infrared radiation as an intermediary to bridge the gap between the optical member and the external sensor. The infrared sensor positioned outside the optical path detects infrared radiation emitted by the optical member, allowing accurate temperature measurement while maintaining optical path integrity.
Solution Approach 2:
The patent replaces the mechanical contact sensor that would need to be positioned on or near the optical member with a non-contact infrared sensor. This substitution enables temperature measurement from outside the optical path while maintaining both optical integrity and measurement accuracy.
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
Enables precise temperature detection of the optical member, reducing errors and preventing overheating, while maintaining the optical path integrity and allowing for accurate temperature measurement without limiting the movable range of the flash generator.
Implementation Method 1
a temperature measuring section (190) that measures a temperature of a first measurement point on the optical member
Implementation Method 2
profile information representing a correlation between the temperature of the first measurement point and a temperature of a second measurement point
Data Source
AI summary
There is provided a lighting apparatus that is capable of accurately measuring the temperature of an optical member that transmits therethrough light emitted from a light source without blocking the optical path of the light. A lighting apparatus including: a light source that emits light, an optical member that transmits therethrough the light emitted from the light source, a temperature measuring section that measures a temperature of a first measurement point on the optical member, a storing section that stores therein profile information representing a correlation between the temperature of the first measurement point and a temperature of a second measurement point, where the second measurement point is on the optical member and separated away from the first measurement point, and a temperature determining section that determines the temperature of second measurement point based on the temperature of the first measurement point measured by the temperature measuring section and the profile information stored in the storing section.