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Title: Placement accuracy gauge for electrical components and method of using same

Abstract

Surface mounted electrical components are typically assembled on printed wiring board by automatic machines. It is important that the machines accurately move with respect to both X and Y rotational axes in order to insure that components are positioned precisely on connector pads of the printed wiring board being assembled. In accordance with the instant invention, a gauge is used to facilitate convenient accuracy checks. The gauge is a glass substrate on which grids of 0.005 inch lines are scribed to form location and orientation fields where components are to be placed. The grids are referenced from ether fiducial marks or the edge of the substrate to establish known positions within the grids. The equipment to be evaluated is programmed to place components in known positions and the components are held in place by tacky adhesive that is sprayed on the substrate prior to placing the components. The accuracy of the component position is then compared to the programmed position by placing the substrate on a light table and observing the component location. If a significant inaccuracy with respect to any of the axes exists, the inaccuracy is apparent because the component is not aligned properly with the grid. Ifmore » a precise measurement of an axis inaccuracy is desired, a measuring microscope may be utilized. 6 figs.« less

Inventors:
; ;
Issue Date:
Research Org.:
Allied-Signal Aerospace Co., Kansas City, MO (USA). Kansas City Div.
OSTI Identifier:
6286791
Patent Number(s):
-US-A7119878
Application Number:
ON: DE89010951
Assignee:
Dept. of Energy TIC; ERA-14-026908; EDB-89-072285
DOE Contract Number:  
AC04-76DP00613
Resource Type:
Patent
Resource Relation:
Other Information: Portions of this document are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; MEASURING INSTRUMENTS; DESIGN; MICROELECTRONICS; POSITIONING; AUTOMATION; ELECTRONIC EQUIPMENT; INVENTIONS; EQUIPMENT; 420800* - Engineering- Electronic Circuits & Devices- (-1989)

Citation Formats

Biggs, P.M., Dancer, L.K., and Yerganian, S.S. Placement accuracy gauge for electrical components and method of using same. United States: N. p., 1987. Web.
Biggs, P.M., Dancer, L.K., & Yerganian, S.S. Placement accuracy gauge for electrical components and method of using same. United States.
Biggs, P.M., Dancer, L.K., and Yerganian, S.S. Thu . "Placement accuracy gauge for electrical components and method of using same". United States.
@article{osti_6286791,
title = {Placement accuracy gauge for electrical components and method of using same},
author = {Biggs, P.M. and Dancer, L.K. and Yerganian, S.S.},
abstractNote = {Surface mounted electrical components are typically assembled on printed wiring board by automatic machines. It is important that the machines accurately move with respect to both X and Y rotational axes in order to insure that components are positioned precisely on connector pads of the printed wiring board being assembled. In accordance with the instant invention, a gauge is used to facilitate convenient accuracy checks. The gauge is a glass substrate on which grids of 0.005 inch lines are scribed to form location and orientation fields where components are to be placed. The grids are referenced from ether fiducial marks or the edge of the substrate to establish known positions within the grids. The equipment to be evaluated is programmed to place components in known positions and the components are held in place by tacky adhesive that is sprayed on the substrate prior to placing the components. The accuracy of the component position is then compared to the programmed position by placing the substrate on a light table and observing the component location. If a significant inaccuracy with respect to any of the axes exists, the inaccuracy is apparent because the component is not aligned properly with the grid. If a precise measurement of an axis inaccuracy is desired, a measuring microscope may be utilized. 6 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {11}
}