Apparatus for preheating printed circuit boards

Details Apparatus for preheating printed circuit boards Apparatus for preheating printed circuit boards

1984-07-02

1986-11-25

Richter, Sheldon J.

Heat exchange

With retainer for removable article

Electrical component

165185, 269903, 361234, H01L 2340, F28F 1300

Patent

active

046243020

ABSTRACT:
A heating device is disclosed wherein a printed circuit board is uniformly preheated before discrete electronic components are soldered onto the boards. The soldering process includes a reflow stage where the boards are subject to rapid temperature change causing internal heat stresses which warp the boards if they haven't been preheated. The device comprises a non-conductive body and conductive elements, such as steel staples, embedded in said body. The staples extend through both sides of said body making contact with a heating surface and supporting the printed circuit board which sits upon them. The staples are spaced and arranged so the components' electrical pins which extend beyond the bottom surface of the board pass into the bed of staples without interference. Therefore, heat is transferred from the heating surface directly to the board via the conducting staples in a uniform fashion.

REFERENCES:
patent: 1977731 (1934-10-01), Masury
patent: 2365670 (1944-12-01), Wallace
patent: 3128419 (1964-04-01), Waldkotter et al.
patent: 3327779 (1967-06-01), Jacoby
patent: 4102152 (1978-07-01), Covault
patent: 4104508 (1978-08-01), Ebert
patent: 4189630 (1980-02-01), Ebert
patent: 4226281 (1980-10-01), Chu
patent: 4235283 (1980-11-01), Gupta
patent: 4279241 (1981-07-01), Himes
patent: 4502094 (1985-02-01), Lewin et al.

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