The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 11, 1987
Filed:
May. 20, 1985
Moritoshi Ando, Atsugi, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A method of and apparatus for visual inspection of the condition of soldered connections between connector pads of a wiring pattern provided on a circuit board and tips of conductor pins of an IC package mounted thereby on the circuit board. The back, or bottom surface of the circuit board is illuminated by a flood of light to produce diffused, or scattered, light in the gap between the circuit board and the IC package, which diffused light is emitted from the edge of the gap. The emitted light is deflected by a small prism disposed adjacent the edge of the gap into a focusing means, such as a stereoscopic microscope having a long focal distance and an optical axis oriented substantially perpendicularly to the surface of the circuit board. Images of the soldered connections are observeable through the eyepiece of the microscope, or are detected by a photoelectric transducer such as a video camera for display on a video screen.