Remote position indicator for follow-up devices in recording systems

Claim 1

A remote position indicator capable of use in a recording system comprising electrical input signal means for accepting and amplifying an electrical input signal, a rotatable shaft, means for positioning said shaft by converting said signal to rotational motion of said shaft, means connected to said shaft for indicating said position an optical mask affixed To said shaft, said mask containing apertures arranged along separate paths, light source means fixedly positioned relative to motion of said shaft for shining light upon said mask and through not more than one of said apertures of each of said paths at a given time as a function of shaft position, means for detecting said shined-through light and for converting said shined-through light to electrical signals, said input signal means including means for counting said electrical signals from each of said paths and responsive to the relative times of occurrence of said feedback electrical signals for increasing and decreasing the total count, means for converting said total count to an analog signal, and means for comparing said analog signal and said electrical input signal for controlling said shaft positioning means.

Claim 3

A system for recording at least one electrical signal, said system comprising: means for amplifying said signal; means for applying said electrical signal to an input of said amplifying means; electro-mechanical means responsive to output of said amplifying means for registering said amplified electrical signal; said electro-mechanical means including chart paper means and galvanometer pen means for scribing a representation of said electrical signal on said chart paper means; optical feedback means responsive to operation of said electro-mechanical means for generating feedback light signals related to amplitude of said electrical signal; said optical feedback means including an optical mask containing apertures arranged along separate paths, light source means for shining light upon said mask and through not more than one of said apertures of each of said paths at a given time, means for positioning said mask relative to said light source means and thereby controlling said feedback light signals through said apertures; means for detecting said feedback light signals and for converting said feedback light signals to feedback electrical signals; said amplifying means including means for counting said feedback electrical signals from each of said paths and responsive to the relative times of occurrence of said feedback electrical signals for increasing and decreasing the total count, means for converting said total count to an analog signal, and means for comparing said analog signal and said electrical signal for generating said output of said amplifying means.

Claim 4

A system for recording at least one electrical signal, said system comprising: means for amplifying said signal; means for applying said electrical signal to an input of said amplifying means; electro-mechanical means responsive to output of said amplifying means for registering said amplified electrical signal; said electro-mechanical means including chart paper means and galvanometer pen means for scribing a representation of said electrical signal on said chart paper means; optical feedback means responsive to operation of said electro-mechanical means for generating feedback light signals related to amplitude of said electrical signal; said optical feedback means including an optical mask containing apertures arranged along separate paths, light source means for shining light upon said mask and through not more than one of said apertures of each of said paths at a given time, means for positioning said mask relative to said light source means and thereby controlling said feedback light signals through said apertures; means for detecting said feedback light signals and for converting said feedback light signals to feedback electrical signals; said amplifying means including means for counting said feedback electrical signals from each of said paths and responsive to the relative times of occurrence of said feedback electrical signals for increasing and decreasing the total count, means for converting said total count to an analog signal, and means for comparing said analog signal and said electrical signal for generating said output of said amplifying means.