Light Distribution Measurement Using Rotating Mirror
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Solution Overview
Problem
Existing light distribution characteristic measurement apparatuses face challenges in efficiently measuring the light distribution characteristics of light sources with large light emission surfaces without increasing the apparatus size or complexity.
Innovation Solution
A light distribution characteristic measurement apparatus that includes a rotation mechanism to control the mirror's rotational angle, ensuring non-overlapping fields of view, and a processor to calculate the detecting unit's angle of view relative to the light source, along with a lens to adjust the focal point and a second mirror to optimize the optical path, allowing for efficient measurement of large light sources with a compact setup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the distance between the detecting unit and the light source is increased to encompass the whole light source in the field of view, then the measurement capability for large light sources is improved, but the apparatus size and complexity increase
Solution Approach 1:
The patent introduces a mirror positioned between the detecting unit and the light source to fold the optical path. This transforms the linear spatial arrangement into a two-dimensional configuration, allowing the detecting unit to capture the entire light source within a compact apparatus footprint while maintaining the necessary measurement distance through optical path extension.
2Length of stationary object
If a mirror is introduced to fold the optical path and extend the measurement distance, then the measurement distance is sufficiently increased, but the apparatus complexity increases
Solution Approach 1:
The mirror serves as an optical intermediary that folds the measurement path, enabling the detecting unit to be positioned closer to the light source while maintaining an extended effective measurement distance. This intermediary component resolves the contradiction by decoupling the physical distance from the optical path length.
3Area of stationary object
If the field of view of the detecting unit is expanded to cover the entire light source, then the imaging range is increased, but the apparatus size increases
Solution Approach 1:
By positioning the mirror at an angle and folding the optical path, the patent enables the detecting unit to achieve a large imaging range without requiring a proportionally large apparatus volume. The mirror creates a virtual extension of the detection space, allowing comprehensive light source coverage within a compact physical footprint.
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 accurate and efficient measurement of light distribution characteristics for light sources with large emission surfaces, maintaining a compact apparatus size and reducing complexity, while ensuring a sufficient measurement distance and expanded imaging range.
Implementation Method 1
a mirror to reflect light from the light source and direct the reflected light to the detecting unit
Implementation Method 2
a lens to adjust the focal point of the detecting unit on the light emission surface of the light source
Data Source
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AI summary
A light distribution characteristic measurement apparatus (1) includes: a detecting unit (8) for detecting light from a light source (10); a mirror (5) for reflecting the light from the light source to direct the light to the detecting unit; a movement mechanism (11, 12) for moving the detecting unit and the mirror relatively to the light source; a rotation mechanism (13) for rotating the mirror while maintaining an optical path length from the light source to the detecting unit; and a processor (100) adapted to calculate the light distribution characteristic of the light source, based on a plurality of measurement results that are detected by the detecting unit under a condition that the detecting unit and the mirror are arranged at a plurality of measurement positions relative to the light source and the mirror is oriented at different rotational angles for each measurement position.