IC device-in-pocket detection with angular mounted lasers and a camera
View Patent ↗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.
1. A detection apparatus for detecting a device, comprising:
at least two angular mounted lasers configured to form a laser pattern on a surface of the device;
a pocket, configured to receive the device in a position wherein the surface of the device is exposed to the laser pattern emitted by the at least two angular mounted lasers;
a camera for detecting the laser pattern formed by the laser lines on the surface of the device; and
a processor for analyzing the laser pattern, wherein the processor is configured to determine whether the device is present and in a predetermined position in the pocket surface based on the laser pattern.
2. The detection apparatus of claim 1 , wherein the surface is a device substrate.
3. The detection apparatus of claim 1 , wherein the angular mounted lasers emit straight line laser patterns.
4. The detection apparatus of claim 1 , wherein the angular mounted lasers are mounted at angle in the range of thirty-five to fifty-five degrees relative to the normal direction of the device surface.
5. The detection apparatus of claim 1 , wherein the laser lines are projected on the device surface ninety degrees relative to each other.
6. The detection apparatus of claim 1 , wherein each of the angular mounted lasers are mounted at the same angle relative to the normal direction of the device surface.
7. A method for detecting a device in a pocket, comprising:
emitting laser lines on a surface of the device to form a laser pattern on a surface of the device;
detecting the laser pattern on the surface of the device;
analyzing the laser pattern;
determining at least one of a height or tilt of the surface of the device in relation to a surface of the pocket based on the analysis, a perspective transform and least mean square best fitting algorithm; and
determining whether the device is present and in a predetermined position in the pocket surface based on the laser pattern.
8. The method of claim 7 , further comprising determining whether a plurality of pins located on the device are properly inserted into mask pinholes.
9. The method of claim 7 , wherein the analyzing step comprises:
analyzing at least one of the positions, orthogonality, angle, shape or size of the laser pattern;
comparing the laser pattern with a trained laser pattern;
calculating the positional and angular differences between the laser pattern and calibrated laser pattern; and
based on the calculated positional and angular differences, determining the position of the device.
10. The method of claim 7 , wherein the analyzing step further comprises:
trimming a tail of the laser lines according to a calibrated laser line, to increase the signal to noise ratio of the laser lines; and
filtering noise surrounding the laser lines with a low-pass filter.