Confocal Optical System with Adjustable Objective Lens
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Solution Overview
Problem
Existing component measurement apparatuses face challenges in obtaining accurate measurement data from a desired depth direction due to a fixed positional relationship between the objective lens and the object of measurement, leading to difficulties in changing the measurement position along the depth direction.
Innovation Solution
A confocal optical system with an adjustable focal position of the objective lens, combined with a motion drive mechanism for three-dimensional relative movement between the optical system and the object of measurement, allows for precise adjustment of the measurement position, utilizing a variable wavelength laser and multiple light-receiving elements for stable and accurate data acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed positional relationship between the objective lens and the object of measurement is used, then the apparatus structure is simple, but the measurement position along the depth direction cannot be easily changed
Solution Approach 1:
The patent applies the dynamics principle by making the objective lens movable along the optical axis direction. The lens driving mechanism enables the objective lens to dynamically adjust its position, allowing measurement at different depth positions within the object. This transforms the previously fixed optical system into a dynamic one that can adapt to various measurement requirements while maintaining a relatively simple overall structure.
2Measurement precision
If laser light output varies, then the light source is simple, but measurement accuracy deteriorates
Solution Approach 1:
The patent implements feedback control by introducing a light-receiving element that detects the actual laser light output and feeds this information back to a laser driving circuit. The circuit adjusts the laser drive current based on the detected output, creating a closed-loop control system that maintains stable light output. This feedback mechanism ensures measurement accuracy while keeping the light source control system relatively simple.
Solution Approach 2:
The patent applies parameter changes by adjusting the drive current to the laser diode based on detected output levels. The laser driving circuit modifies the electrical parameter (current) in response to optical parameter variations (light output), thereby maintaining consistent light intensity for accurate measurements without requiring complex stabilization hardware.
3Adaptability or versatility
If multiple measurement depths are required, then measurement flexibility is improved, but the time to reposition the measurement point increases
Solution Approach 1:
The patent replaces mechanical repositioning of the entire optical system with electronic control of the objective lens position. Instead of moving heavy components mechanically, a lightweight objective lens is driven by an electric motor or piezoelectric actuator along the optical axis, enabling rapid and precise depth adjustment without significant time loss.
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 the collection of accurate measurement data from a desired depth direction, improving the precision and flexibility of component analysis, such as glucose concentration in blood, by allowing for adjustable measurement positions and stable light intensity control.
Implementation Method 1
laser light emitted from a laser
Implementation Method 2
a collimating lens that shapes the laser light emitted from the laser into collimated light
Implementation Method 3
an objective lens that condenses the collimated light having exited the collimating lens
Implementation Method 4
reflected light reflected by the internal tissue of the object of measurement
Implementation Method 5
refracted by the objective lens
Implementation Method 6
a light-receiving element that receives the reflected light having passed through the pin hole
Implementation Method 7
measures a component of the object of measurement in accordance with data output from the light-receiving element
Data Source
AI summary
A component measurement apparatus includes a confocal optical system including a laser emitting laser light, a collimating lens collimating the laser light emitted from the laser, an objective lens condensing the collimated light having exited the collimating lens in order to illuminate internal tissue of an object of measurement, a half mirror redirecting reflected light reflected by the internal tissue of the object of measurement and refracted by the objective lens, a pin hole through which the reflected light redirected by the half mirror passes, and a light-receiving element receiving the reflected light having passed through the pin hole. The component measurement apparatus also includes a data analyzer section measuring a component of the object of measurement in accordance with data output from the light-receiving element. In the component measurement the apparatus, a focal position of the objective lens is adjustable along an optical axis.