Automatic optical inspection of components using a shadow projection threshold for a data storage device
First Claim
1. A method by steps comprising comparing electronically a reflected light intensity transition region with a predetermined reflected light intensity transition region threshold to determine compliance of a component.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and apparatus for determining compliance of a component of a printed circuit board assembly that includes determining the presence or non-presence of a component on a printed circuit board assembly (PCBA), by comparing electronically a reflected light intensity transition region with a predetermined reflected light intensity transition region threshold, using a computer controlled vision system operating under component compliance software. Wherein the reflected light intensity transition region is an intensity of light reflected off a meniscus of a solder joint formed between the component and a solder pad referred to as a shadow projection. The shadow projection is characterized as adhering or not adhering to the threshold, and determination of component compliance is based on the characterization of the shadow projection. If the component is found compliant, the PCBA is identified as compliant. If the component is found non-compliant, the PCBA is identified as non-compliant.
20 Citations
24 Claims
- 1. A method by steps comprising comparing electronically a reflected light intensity transition region with a predetermined reflected light intensity transition region threshold to determine compliance of a component.
-
21. An apparatus for determining compliance of a printed circuit board assembly based on compliance of a component connected to the printed circuit board assembly by a solder joint comprising:
-
a light source illuminating the component of the printed circuit board assembly as well as the solder joint connecting the component to the printed circuit board assembly;
a processor controlled vision system responsive to the light source;
an alignment apparatus controlled by a processor supporting the vision system, the alignment apparatus aligning the vision system relative to the solder joint and the component; and
decision software programmed into the processor responsive to the vision system determining compliance of the component connected to the printed circuit board assembly based on a shadow projection of the solder joint to determine compliance of the printed circuit board assembly.
-
-
22. A data storage device comprising:
-
a head-disc assembly; and
a compliant printed circuit board assembly attached to the head-disc assembly, compliance of the printed circuit board assembly determined by means for determining compliance of a printed circuit board assembly through steps for determining compliance of a component connected to a printed circuit board assembly. - View Dependent Claims (23, 24)
-
Specification