End point detector for a tin lead evaporator

Details End point detector for a tin lead evaporator End point detector for a tin lead evaporator

1984-02-27

1985-11-19

Yasich, Daniel M.

Thermal measuring and testing

Transformation point determination

By thermal arrest

148128, 373136, G01N 2510

Patent

active

045538530

ABSTRACT:
A monitoring technique is disclosed for determining when the end point has been achieved in the evaporation of the constituents from an alloy such as a tin lead alloy. An optical pyrometer or other temperature sensing device, is focused on a crucible in which both tin and lead is being heated. Since, under vacuum conditions, lead evaporates at a lower boiling point than does tin, the temperature of the crucible will achieve a first temperature plateau while the lead is being evaporated. After the lead has been depleted in the crucible, the temperature of the crucible will rise to a higher temperature plateau at which the tin will evaporate. The output of the optical pyrometer is digitized and is applied to a microcomputer which periodically samples the temperature of the crucible. The microcomputer is programmed to identify the lower boiling plateau for the lead constituent, to detect the rise in temperature of the crucible after the lead has been depleted, and to recognize the higher boiling point plateau for the tin constituent. The microcomputer will then output a signal to turn off the heating source to the crucible when the temperature of the crucible is detected to rise after the second, higher boiling point plateau for the tin.

REFERENCES:
patent: 404600 (1889-06-01), Caspersson
patent: 2127889 (1938-08-01), Shenk et al.
patent: 2404147 (1941-12-01), Strickland, Jr.
patent: 2535855 (1950-12-01), Kurek
patent: 2640137 (1950-11-01), Ketchledge
patent: 2815276 (1955-07-01), Michaux
patent: 3504525 (1970-04-01), Ishii
patent: 3718757 (1973-02-01), Gulitz et al.
patent: 3745834 (1973-07-01), Veltze et al.
patent: 3891834 (1975-06-01), Warsinksi
patent: 3925117 (1975-12-01), Stone et al.
patent: 3925118 (1975-12-01), Hollan
patent: 4018566 (1977-04-01), Zeuch et al.
patent: 4020695 (1977-05-01), Roney
patent: 4046509 (1977-09-01), Backerud
patent: 4058429 (1977-11-01), Duncan et al.
patent: 4166378 (1979-09-01), Berger et al.
patent: 4229412 (1980-10-01), Orths et al.
patent: 4258003 (1981-03-01), Hurle et al.
patent: 4274284 (1981-06-01), Hance
patent: 4355907 (1982-10-01), Orths et al.
patent: 4443118 (1984-04-01), Cure
patent: 4484823 (1984-11-01), Peuker
C. Carpenter, et al, "Two-Cycle Pb/Sn Solder Evaporation," IBM TDB, 12/81, p. 3393. IBM T.D. Bulletin, vol. 24, No. 7A.
J. Cosgrove, et al, "Single-Heater Multi-Material Evaporation Source," 5/82, pp. 6423-6425. IBM T.D. Bulletin, vol. 24, No. 12.
K. Beermunder, et al, "Thermocouple Heat Control Radiation Shield," 10/82, p. 2279. IBM T.D. Bulletin vol. 25, No. 5.
E. Brainard, et al, "Ramping Technique for Pb/Sn Evaporation," 2/83, pp. 4756-4757, IBM T.D. Bulletin, vol. 25, No. 9.
F. Hornbeck, et al, "Measurement of Temperature in Vacuum Deposition Apparatus," 2/83, p. 4512. IBM T.D. Bulletin, vol. 25, No. 9.
W. Brown, et al, "Lead/Copper/Tin Co-Evaporation Process System," 4/83, p. 6113. IBM T.D. Bulletin, vol. 25, No. 11B.
V. Marcotte, et al, "Enchanced E--Beam Evaporation of Tin," pp. 608-609. IBM Disclosure Bulletin, vol. 26, No. 2, Jul. 1983.

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