Browse Prior Art Database

Top Reference MLC Four Point Locator

IP.com Disclosure Number: IPCOM000045387D
Original Publication Date: 1983-Mar-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Geany, GM: AUTHOR [+4]

Abstract

The optic arrangement for reading and aligning on the top surface of multilayer ceramic (MLC) substrates requires considerable refocusing due to the different thicknesses of the various substrates. To eliminate the need to refocus, a top reference four-point locator was developed.

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Top Reference MLC Four Point Locator

The optic arrangement for reading and aligning on the top surface of multilayer ceramic (MLC) substrates requires considerable refocusing due to the different thicknesses of the various substrates. To eliminate the need to refocus, a top reference four-point locator was developed.

Referring to Fig. 1, there are shown schematic diagrams of the four-point locator illustrating the operation with thick and thin substrates. Fig. 1A shows a thick substrate 10 held in the up position by a lifter 12. The top surface of the thick substrate 10 is pressed against the bottom surface of the top portion of the four-point locator. It should be appreciated, that the focal length of the optics arrangement 14, once it is set, requires no refocusing, since the top surface is always at the same distance from the optics when the lifter is In the up position.

Fig. 1B shows the thick substrate 10 in the down position.

Fig. 1C shows a thin substrate 10 held in the up position in the four-point locator. It should be appreciated, that the focal length for the optics is the same as it was in the case of the thick substrate since the top surfaces are the same distance from the optics arrangement.

Fig. 1D shows the same arrangement for the thin substrate 10 in the down position.

Fig. 2 shows the control arrangement for clamping and lifting the substrates. Three solenoids 20, 22 and 24 are shown controlling a clamp cylinder 26 and a lift cylinder 28. Solen...