Wobble Detection Using Dual 1D Sensors
Solution Overview
Problem
Existing wobble detection devices face accuracy issues when detecting the wobble amount of an object in transit or moving relative to the device, particularly due to the limitations of line sensors arranged for triangulation, which become ineffective when the object moves orthogonally to the sensor arrangement.
Innovation Solution
A wobble detection device equipped with a sensor unit comprising two one-dimensional image sensors arranged side by side in an auxiliary scanning direction, allowing for the comparison of image data to detect movement in the main scanning direction, thereby enhancing the accuracy of wobble detection for moving objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two line sensors are arranged side by side in the auxiliary scanning direction to enable triangulation-based distance measurement, then distance measurement capability is achieved, but wobble detection accuracy deteriorates when the object moves in the main scanning direction
Solution Approach 1:
The patent transitions from a two-dimensional arrangement of line sensors to a three-dimensional configuration by adding the auxiliary scanning direction. The first and second one-dimensional image sensors are arranged side by side in the auxiliary scanning direction, creating a multi-dimensional detection space that enables effective wobble detection for objects moving in the main scanning direction through comparison of images captured at different positions.
Solution Approach 2:
The patent divides the detection function into multiple specialized sensors: the first one-dimensional image sensor captures images at a first position, the second one-dimensional image sensor captures images at a second position, and optionally a third sensor captures at a third position. This segmentation allows each sensor to specialize in capturing images from specific angles, improving overall detection accuracy when objects move in the main scanning direction.
2Measurement precision
If line sensors are arranged for triangulation to measure distance to stationary objects, then distance measurement is achieved, but detection accuracy deteriorates for objects in transit or moving relative to the device
Solution Approach 1:
The patent implements a feedback mechanism where the wobble detection unit compares images captured by multiple sensors and calculates wobble amounts based on the differences. This feedback loop continuously adjusts and refines the detection by using the actual image data from moving objects, thereby maintaining reliable detection accuracy even when objects are in transit or moving relative to the device.
Solution Approach 2:
The patent transitions from a static triangulation arrangement optimized for stationary objects to a dynamic multi-sensor configuration. The first, second, and optionally third one-dimensional image sensors are positioned to capture images from different locations, enabling the system to adapt to and accurately detect wobbling motions of objects in transit or moving relative to the device.
3Adaptability or versatility
If two line sensors are arranged side by side to obtain distance by triangulation, then distance measurement is enabled, but wobble detection becomes impossible when the object moves orthogonally to the sensor arrangement direction
Solution Approach 1:
The patent creates a universal detection system that can handle multiple movement directions and scenarios. By arranging the first, second, and optionally third one-dimensional image sensors side by side in the auxiliary scanning direction, the system becomes multi-functional: it can detect wobbling motions of objects moving in the main scanning direction, objects in transit, and objects moving relative to the device, regardless of the orthogonal movement constraints of traditional triangulation arrangements.
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 significantly improves the detection accuracy of the wobble amount for objects in motion by enabling effective comparison and correlation of image data across the sensors, even when the object moves orthogonally to the sensor arrangement.
Implementation Method 1
a sensor unit which includes a first one-dimensional image sensor and a second one-dimensional image sensor arranged side by side in an auxiliary scanning direction
Data Source
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AI summary
A wobble detection device (100) includes a sensor unit (10). The sensor unit (10) includes a one-dimensional image sensor (160) and a one-dimensional image sensor (170) arranged side by side in an auxiliary scanning direction so that their corresponding pixels coincide with each other in a main scanning direction, and acquires an image of an object moving in the auxiliary scanning direction as one-dimensional data. The wobble detection device makes a comparison of data corresponding to the same image region by using one-dimensional data (S1) acquired by the one-dimensional image sensor (160) and one-dimensional data (S2) acquired by the one-dimensional image sensor (170) and thereby detects a movement amount of the image in the main scanning direction between a time when the one-dimensional data (S1) used for the comparison was acquired and a time when the one-dimensional data (S2) used for the comparison was acquired.