Wave Plate Alignment Detection With Linearly Polarized Light
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Solution Overview
Problem
Existing optical alignment technologies for combining linear polarizers and wave plates lack precision, affecting the quality of optical elements such as optical lens filters and 3D glasses by not accurately adjusting chromatic aberration or achieving optimal 3D effects.
Innovation Solution
An optical alignment detection apparatus and method using linearly polarized light to detect and align a wave plate with a fixed linear polarizer, employing a light source, first and second linear polarizers, and an optical detector to record and analyze beam intensity changes as the wave plate rotates, determining optimal alignment based on maximum or minimum intensity values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional optical alignment technology is used to combine linear polarizer and wave plate, then the manufacturing process can be completed, but the alignment precision is insufficient, affecting the quality of optical elements
Solution Approach 1:
The patent introduces a linear polarizer as an intermediary component in the detection system. This linear polarizer converts the beam into linearly polarized light, which then interacts with the wave plate to produce intensity changes that can be detected. This intermediary mechanism enables precise measurement of the wave plate's orientation, thereby improving alignment detection precision and subsequently manufacturing precision of optical elements.
Solution Approach 2:
The patent utilizes changes in light intensity parameters as the wave plate rotates. By detecting the intensity variations of the alignment beam at different rotation angles, the system can precisely determine the optimal alignment position (maximum or minimum intensity). This parameter-based detection method transforms the alignment problem into a measurable intensity variation problem, significantly improving measurement precision.
2Ease of manufacture
If wave plate and linear polarizer are attached without precise alignment, then the manufacturing process is simplified, but the quality of optical products deteriorates due to inaccurate chromatic aberration adjustment and suboptimal 3D effects
Solution Approach 1:
The patent implements a self-alignment mechanism where the wave plate automatically positions itself to achieve optimal alignment. By rotating the wave plate and detecting the intensity changes of the alignment beam, the system identifies the maximum or minimum intensity point as the correct alignment position. This self-service approach eliminates the need for complex external alignment equipment or manual adjustment, maintaining manufacturing simplicity while achieving high alignment accuracy.
Solution Approach 2:
The patent employs feedback through the optical detector that continuously monitors the intensity of the alignment beam. This feedback information is used to determine when the wave plate reaches the optimal alignment position (maximum or minimum intensity). The feedback mechanism provides real-time guidance for alignment, ensuring high precision without complicating the manufacturing process, as the feedback automatically guides the alignment process.
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
Improves alignment accuracy of wave plates and linear polarizers, enhancing the quality of optical elements by ensuring precise adjustment of chromatic aberration and 3D effects.
Implementation Method 1
The first linear polarizer is disposed on a side of the light source system and located on a transmission path of the beam, the beam being converted into linearly polarized light by the first linear polarizer
Implementation Method 2
attached to the wave plate, the fast axis and the slow axis of the beam generate a phase difference to further achieve the purpose of adjusting the chromatic aberration or the 3D effect
Implementation Method 3
The optical detector is disposed on a side of the second linear polarizer away from the first linear polarizer, and receives the alignment beam, and records and analyzes the intensity of the alignment beam
Data Source
AI summary
An optical alignment detection apparatus is adapted to detect a wave plate to be detected. The optical alignment detection apparatus includes a light source system, a first linear polarizer, a second linear polarizer, and an optical detector. The wave plate to be detected is rotatably disposed between the first linear polarizer and the second linear polarizer. The beam is converted into an alignment beam through the first linear polarizer, the wave plate to be detected, and the second linear polarizer, and is received by the optical detector. When the wave plate to be detected rotates, an intensity of the alignment beam received by the optical detector would change periodically. An angle of an optical axis between the wave plate to be detected and the second linear polarizer can be judged according to the periodical change of the intensity of the beam, so as to achieve precise alignment.