Differential Interference Prism Focusing Device
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Solution Overview
Problem
Conventional microscope focusing devices require significant time for focusing detection and have limitations in achieving high accuracy due to the need to remove the differential interference prism from the optical path during focusing detection.
Innovation Solution
A focusing device that includes a differential interference prism, a light source, a photo detection unit, and a condition changing unit, which adjusts the shearing amount of the prism to optimize error signal acquisition conditions, allowing for accurate focusing detection without removing the prism from the optical path, thereby reducing detection time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the differential interference prism is removed from the optical path during focusing detection, then the focusing detection can be performed, but the detection time is significantly extended due to the mechanical movement required
Solution Approach 1:
The patent changes the shearing amount parameter of the differential interference prism to optimize error signal acquisition. By adjusting this parameter, the system can perform accurate focusing detection while the prism remains in the optical path, eliminating the need for mechanical removal and reducing detection time.
Solution Approach 2:
The patent makes the shearing amount of the differential interference prism adjustable and dynamic. This allows the system to adapt the prism's optical properties during operation, enabling focusing detection without removing the prism from the optical path, thus resolving the contradiction between detection accuracy and detection time.
2Productivity
If the differential interference prism remains in the optical path during focusing detection, then the detection time is shortened, but the error signal acquisition quality deteriorates without proper adjustment
Solution Approach 1:
The patent optimizes error signal acquisition by changing the shearing amount parameter of the differential interference prism. This parameter adjustment ensures high-quality error signal acquisition even when the prism remains in the optical path, maintaining both speed and precision.
Solution Approach 2:
The patent performs preliminary adjustment of the shearing amount before focusing detection begins. This preliminary action ensures that the optimal conditions for error signal acquisition are established in advance, allowing the prism to remain in the optical path throughout the detection process without compromising signal quality.
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 enables high-accuracy focusing detection while significantly shortening the time required for focusing, as the shearing amount of the differential interference prism is adjusted to optimize error signal acquisition, allowing for continuous operation without disrupting the optical path.
Implementation Method 1
a differential interference prism used in differential interference observation in a focusing detection optical system
Data Source
AI summary
A focusing device that includes a differential interference prism used in differential interference observation in a focusing detection optical system includes: a light source that emits light with which a measurement surface of an observation sample is irradiated; a photo detection unit that detects light from the measurement surface; a focusing detection unit that detects an error signal near a focusing point of the measurement surface on the basis of an output signal from the photo detection unit; and a condition changing unit that changes an acquisition condition of the error signal.