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:
Dec. 31, 1991
Filed:
Oct. 14, 1988
Hitachi, Ltd., Tokyo, JP;
Abstract
Light projectors for slit lights are so arranged that at least two slit lines developed by projecting the slit lights on a chip component or the like obliquely thereto intersect each other, and the slit lines are imaged from above the component or the like by TV cameras so as to extend horizontally in the corresponding images. The shapes of the slit lines in the images are analyzed by an image processor, to detect the state change of the chip component or the like, such as the misplacement thereof. Further, if necessary, in order to enhance the contrast of the pattern of the slit line, the slit light is projected by a stroboscopic lamp within the exposure time of the TV camera, for a short time interval which is not longer than the exposure time.