Angular Laser Camera IC Pocket Detection
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Solution Overview
Problem
Current methods for detecting the position and orientation of integrated circuit devices are inefficient in accurately determining device placement, particularly in scenarios where devices are tilted or stacked, and fail to provide a cost-effective, universal solution for various vision sensing applications.
Innovation Solution
A detection apparatus comprising at least two angularly mounted lasers emitting laser lines on a surface, a camera to capture the laser pattern, and a processor analyzing the pattern using a perspective transform and least mean square best fitting algorithm to determine device position and orientation, allowing for detection of in-pocket, double stack, or empty conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional laser detection methods are used, then the system is simple, but the measurement precision is insufficient for tilted or stacked devices
Solution Approach 1:
The detection system is divided into multiple independent laser lines (at least two, preferably three or more) that are angularly mounted relative to each other. Each laser line independently illuminates the device surface, and their combined patterns are analyzed to determine both position and orientation. This segmentation allows the system to handle tilted and stacked devices by analyzing the geometric relationships between multiple laser lines rather than relying on a single laser beam.
Solution Approach 2:
The system transitions from conventional single-point or single-line laser detection to multi-dimensional laser line patterns. By mounting lasers at different angles and emitting multiple laser lines that form a two-dimensional pattern on the device surface, the system gains additional geometric information about orientation and tilt. The camera captures this multi-dimensional pattern, and the processor analyzes the spatial relationships between laser lines to determine device orientation, effectively adding a dimensional aspect to the detection process.
2Measurement precision
If multiple laser lines are emitted at angular orientations, then the detection accuracy for tilted surfaces improves, but the device complexity increases
Solution Approach 1:
The angularly mounted laser system serves multiple functions simultaneously: it illuminates the device surface, creates geometric patterns for orientation detection, and provides reference information for position determination. The same laser lines that illuminate the surface also form the pattern used to calculate tilt angles and device orientation. This multi-functionality reduces the need for separate detection mechanisms and simplifies the overall system architecture despite the angular mounting complexity.
Solution Approach 2:
The system replaces complex mechanical tilt detection mechanisms with an optical and computational approach. Instead of using mechanical sensors or complex optical systems to physically measure tilt, the patent uses laser lines that project geometric patterns onto the surface. The orientation information is extracted through image processing and pattern analysis algorithms, substituting mechanical measurement systems with an optical-field-based solution that is more adaptable to various device configurations.
3Adaptability or versatility
If conventional single-laser detection is used, then the system cost is low, but the adaptability to various device configurations is limited
Solution Approach 1:
The system changes the geometric parameters of the laser illumination by varying the angular orientations of multiple laser lines. Instead of using a single fixed laser beam, the system employs at least two laser lines mounted at different angles relative to each other. This parameter change enables the system to adapt to various device configurations: when devices are tilted, the angular laser lines maintain their illumination pattern, and the processor analyzes the distorted pattern to determine the tilt angle. The same multi-laser configuration handles in-pocket, double stack, and tilted devices by adjusting the geometric analysis parameters.
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 provides accurate and cost-effective detection of device placement, capable of handling tilted surfaces and multiple device configurations, with increased signal-to-noise ratio and adaptability to various vision sensing applications such as bent lead inspection and surface height detection.
Implementation Method 1
lasers have been used in position detection applications... reflected energy signals sensed by light detecting optics
Data Source
AI summary
A detection method and apparatus is provided. The detection apparatus includes at least two angular mounted lasers, a surface for receiving laser lines emitted by the angular mounted lasers, a camera for detecting a laser pattern formed by the laser lines on the surface, and a processor for analyzing the laser pattern. The lasers emit orthogonal laser lines on a surface of the device. The camera detects a laser pattern on the surface of the device and the processor analyzes the laser pattern to determine whether the position of the device is in pocket based on the analysis and position algorithms.