Electrical resistors – Incased – embedded – or housed – Casing or housing formed on and hardened on resistor
Patent
1992-04-06
1994-04-19
Lateef, Marvin M.
Electrical resistors
Incased, embedded, or housed
Casing or housing formed on and hardened on resistor
338 51, 338253, 338159, 338312, 338274, 338332, 338273, H01C 1034
Patent
active
053049772
ABSTRACT:
The film-type electrical power resistor includes a flat ceramic chip on the upper surface of which is screen-printed a resistive film. Terminals (leads) are mechanically and electrically connected to the upper chip surface, the terminals being such that the chip may be positioned by the terminals in a predetermined position in a mold cavity during manufacture of the resistor--prior to introduction of synthetic resin. The synthetic resin forms a molded electrically insulating body that embeds the portions of the terminals that are relatively near the chip, and also embeds the upper portion of the chip, but does not embed the bottom surface of the chip. The relationships are such that the lower chip surface may be engaged flatwise with a flat region of a chassis or heatsink. Accordingly, the chip is a substrate for the film, a heatsink for the film, an insulator maintaining the film electrically insulated from the chassis, and a spacer maintaining the terminals spaced from the chassis. The resistor does not contain any metal layer that is either in an electric circuit or projects outwardly relative to the edges of the chip. To permit assembly of the resistor with a chassis or heatsink, a bolthole extends through the body at a region outside the chip.
REFERENCES:
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Caddock Electronics, Inc. General Catalog 23rd Edition, 1989, pp. 17-21.
Motorola Catalog: 1989 FULL PAK Power Semiconductors for Isolated Package Applications.
Pp. 6-18 and 1-134 of Motorola Catalog entitled BiPolar Power Transitor and Thyristor Data.
Data Sheet No. PD-2.068A from International Rectifier 1985 Product Guide and Specification Databook.
Caddock Electronics, Inc.
Gausewitz Richard L.
Lateef Marvin M.
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