Magnetic force detecting semiconductor device and method for man

Electrical resistors – Incased – embedded – or housed – Element in insulation with outer metallic sheath

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Details

357 72, 338 32H, A01L 2722, A01L 2982, A01L 2996, A01L 4300

Patent

active

049722417

ABSTRACT:
A chip including a Hall element for detecting a magnetic force is p repared. On the chip is formed an unhardened magnetic resin layer, which is formed of a mixture of soft magnetic powder an dsilicone rubber. The unhardened magnetic resin layer is applied with a magnetic field and is stretched in a direction perpendicular to one face of the chip, so that its top portion is formed in a substantially conical shape and its bottom portion is formed in a substantially rectangular block, the ratio of the length Wa of its base to its height Wb, Wb/Wa, being equal to or greater than 1. The magnetic resin layer is then hardened. As a result, a magnetic force detecting semiconductor device is provided, which has a magnetic resin layer with a high magnetic force convergence that has its top portion formed in a conical shape and its bottom portion formed in a rectangular block, the ratio of the length of its base to its height being equal to and greater than 1.

REFERENCES:
patent: 4021767 (1977-05-01), Nonaka et al.
patent: 4048670 (1977-09-01), Eysermans
patent: 4188605 (1980-02-01), Stout

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