Browse Prior Art Database

Apparatus for Small Vertical Movement

IP.com Disclosure Number: IPCOM000090287D
Original Publication Date: 1969-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Hamilton, RL: AUTHOR [+2]

Abstract

The apparatus is for raising and lowering articles through very small increments. Article 10, a ceramic substrate, is floated on the surface of liquid 11, e.g., molten solder, contained in reservoir 12. Rod 13, of uniform volume distribution along its length, is mounted by holder 14 so that it is partially submerged in liquid 11. As rod 13 is raised or lowered into liquid 11, the surface of such liquid is raised and lowered in proportion with the ratio of the volume of that increment of rod 13 which is submerged or removed in a given movement to the overall volume of liquid 11. Because this ratio is very small, the movement of the surface of liquid 11, and consequently of article 10, is very small.

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Apparatus for Small Vertical Movement

The apparatus is for raising and lowering articles through very small increments. Article 10, a ceramic substrate, is floated on the surface of liquid 11, e.g., molten solder, contained in reservoir 12. Rod 13, of uniform volume distribution along its length, is mounted by holder 14 so that it is partially submerged in liquid 11. As rod 13 is raised or lowered into liquid 11, the surface of such liquid is raised and lowered in proportion with the ratio of the volume of that increment of rod 13 which is submerged or removed in a given movement to the overall volume of liquid 11. Because this ratio is very small, the movement of the surface of liquid 11, and consequently of article 10, is very small. One use of the apparatus is in elongating conductive contact pads 15 by which chip 16 is joined to a conductive pattern on substrate 10. Chip 16, supported on vacuum pencil 17, is lowered until pads 15 contact substrate 10. Then, while maintaining the system at a temperature at which pads 15 are flowable, rod 13 is raised to lower substrate 10, thus elongating pads 15 which extend from chip 16 being held in a fixed position by pencil 17.

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