Method for controlling position of a recording pen

Details Method for controlling position of a recording pen Method for controlling position of a recording pen

1997-06-21

1999-07-06

Le, N.

Recorders

Follow-up

347 37, G01D 900, B41J 2300

Patent

active

059203285

ABSTRACT:
A simple and inexpensive device to record one or more phenomena, employing the transmission and receiving of light as a method of sensing pen position. A pen holder (13) is mounted on a pen block (12), as is a light receiver element (15), and pen block (12) is mounted on a threaded pen rod (11), rod (11) being rotated to move the pen block (12) along the length of the pen rod (11). As pen block (12) moves, light receiver element (15) intercepts more or less light flux from a fixed light source (16), producing a voltage in receiver (15) which is processed to a suitable level by an op amp (40), this voltage being called the Lov. Simultaneously, a voltage directly related to the phenomenon being recorded, as generated by a sensor (44), is processed by an op amp (41) to a desired voltage level called the Pov: the Lov and Pov are now compared in a comparator circuit (42) whose output is buffered by an op amp (43), the output of which is called the Mcv. This MCV will be either positive or negative or zero, and is used to control a motor (20) which turns pen rod (11), moving pen block (12), with attatched receiver element (15) and pen holder (13), with attatched pen (14), in a direction such that the Lov becomes equal to the Pov, at which point pen rod (11) stops, with the pen (14) having traced a record of the phenomena on scribed paper moving beneath the pen (14). As time advances, the entire comparation process repeats continuously, and pen (14) is made to follow any change in input from phenomenon sensor (44), leaving a record of any changes on paper which is pulled over a platen beneath pen (14).

REFERENCES:
patent: 5329303 (1994-07-01), Gill
patent: 5567063 (1996-10-01), Chiu

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