Optical Measuring Device Using Tilted Sensor Surface
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Solution Overview
Problem
Existing optical measuring devices require multiple image sensors and optical components like beam splitters and half mirrors, leading to increased size, cost, and complexity, which complicates measurement accuracy and alignment.
Innovation Solution
An optical measuring device using a two-dimensional image sensor with a tilted light receiving surface and a control unit that detects light intensity changes to determine object position, eliminating the need for multiple sensors and optical components by utilizing a telecentric optical system and differential light intensity analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple image sensors and optical components (beam splitters, half mirrors) are used to detect object position, then measurement accuracy is improved, but device complexity and size increase
Solution Approach 1:
The patent combines multiple detection functions into a single two-dimensional image sensor. Instead of using separate image sensors for different measurement purposes, the invention uses one sensor that captures both in-plane and depth information by detecting light intensity distributions at different focal positions, thereby reducing the number of optical components while maintaining measurement accuracy
Solution Approach 2:
The two-dimensional image sensor is designed to perform multiple functions simultaneously: it detects both the position of objects in the measurement plane and the depth position along the optical axis. By analyzing light intensity distributions at different focal positions, the sensor provides comprehensive spatial information without requiring dedicated sensors for each measurement dimension
2Measurement precision
If multiple image sensors and optical components are used for position detection, then measurement accuracy is improved, but device size increases
Solution Approach 1:
The patent merges multiple detection functions into a single two-dimensional image sensor. Instead of using separate image sensors for different measurement purposes, the invention uses one sensor that captures both in-plane and depth information by detecting light intensity distributions at different focal positions, thereby reducing the number of optical components and device size
3Difficulty of detecting and measuring
If multiple optical components are used to guide light to image sensors, then position detection capability is improved, but adjustment difficulty and cost increase
Solution Approach 1:
The patent combines multiple detection functions into a single two-dimensional image sensor. Instead of using separate image sensors for different measurement purposes, the invention uses one sensor that captures both in-plane and depth information by detecting light intensity distributions at different focal positions, thereby reducing the number of optical components and simplifying adjustment
Solution Approach 2:
The patent replaces complex mechanical optical systems with a computational approach. By using a single image sensor to capture light intensity distributions and applying image processing algorithms to analyze these distributions at different focal positions, the system eliminates the need for multiple mechanical optical components and their associated alignment mechanisms
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
This configuration simplifies the device, reduces costs, and enhances measurement accuracy and speed by using a single two-dimensional image sensor, reducing the need for complex optical component alignment and minimizing ghosting issues.
Implementation Method 1
an optical system configured to guide the light passing through the measurement space to the light receiving surface of the light receiving unit
Implementation Method 2
the light receiving surface of the light receiving unit is tilted by a predetermined angle around an axis parallel to a second direction that is perpendicular to the first direction
Implementation Method 3
a light receiving unit configured to output a signal indicating a two-dimensional distribution of a light incident on a light receiving surface
Data Source
AI summary
An illumination unit emits a light parallel to a first direction to a measurement space. A light receiving unit outputs a signal indicating a two-dimensional distribution of a light incident on a light receiving surface. An optical system guides the light passing through the measurement space to the light receiving surface. A control unit detects a position of the measurement object in the first direction based on the signal. The light receiving surface is tilted by a predetermined angle around a second direction with respect to a transmission direction of the light. The control unit detects a position where light intensity is changed by a predetermined value in the second direction in the two-dimensional distribution, detects a position where the detected position is located in a third direction, and detects a position where the measurement object is placed in the first direction in the measurement space.