Apparatus for enabling the motion of a scriber to be reproduced

Details Apparatus for enabling the motion of a scriber to be reproduced Apparatus for enabling the motion of a scriber to be reproduced

1977-05-16

1978-09-12

Grieb, William H.

Telegraphy

Systems

Printing

178 19, G09B 1100

Patent

active

041125975

ABSTRACT:
Apparatus to teach students to write includes a housing having a generally horizontally disposed, dielectric, translucent plate having a flat face over which a scribe can be moved and which receives a sheet of translucent, tracing paper. The same housing derives control signals in response to an instructor moving a metal scriber across the face or as an output device for visually reproducing the scriber movement. To derive control signals for X and Y axes movement of the scriber, orthogonally positioned antennas couple orthogonal electromagnetic fields having differing frequencies to the plate. The characteristics of the electromagnetic fields are changed in response to movement of the scriber within those fields, hence the signal received by a receiver for each of the frequencies depends on the scriber movement. The detected variations in signals received by the receivers are fed to a multi-track magnetic tape recorder for future playback. In playback, the tape recorder signals that control movement of a point source of light that is projected onto the plate to visually reproduce the scriber movement. To provide persistence of vision and enable a student to trace a pattern corresponding to the movement of the light source, the plate includes phosphors having a decay time of about 1 or 2 seconds.

REFERENCES:
patent: 2241544 (1941-05-01), Dreyer
patent: 2338949 (1944-01-01), Kupfmuller et al.
patent: 2527835 (1950-10-01), Miller
patent: 2565612 (1951-08-01), Levin
patent: 3162959 (1964-12-01), Woolman
patent: 3425140 (1969-02-01), Dillon et al.
patent: 3535447 (1970-10-01), Woolrich
patent: 3680224 (1972-08-01), Hall
patent: 3761877 (1973-09-01), Fernald
patent: 3838211 (1974-09-01), Joannou

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