Pressure-sensitive conductive elastic sheet

Details Pressure-sensitive conductive elastic sheet Pressure-sensitive conductive elastic sheet

1982-07-19

1984-05-15

Herbert, Jr., Thomas J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

178 17B, 178 18, 340347P, 427 47, 427 48, 428323, 428329, 428900, 428913, 428914, B32B 702, B05D 314, C09J 702

Patent

active

044488378

ABSTRACT:
A pressure-sensitive, conductive elastic sheet for use in a graphics digitizing tablet through which various letters or figures can be detected, the characteristics of which are such that the contact pressure is almost constant irrespective of contact area or increases with increasing contact area. The pressure-sensitive sheet according to the present invention comprises a silicon rubber in which a number of coarse, ferromagnetic, conductive metal particles with a diameter of 30 to 150 micron are mixed with a number of fine, ferromagnetic, conductive metal particles with a diameter of 10 micron or less or 50 micron or less at a predetermined proportion in such a manner that the coarse particles are aligned vertically through the interior thereof and the fine particles are dispersed near at least one surface thereof. To properly align the particles, the sheet is allowed to set within a uniform magnetic field.

REFERENCES:
patent: 3590158 (1971-06-01), Pabst
patent: 3624619 (1971-11-01), Ambrosio
patent: 4292261 (1981-09-01), Kotani et al.

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