Browse Prior Art Database

Hand Velocity Recording

IP.com Disclosure Number: IPCOM000080993D
Original Publication Date: 1974-Mar-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Lapo, RB: AUTHOR [+4]

Abstract

The light-emitting diode (LED) 15, mounted on ring 11 and worn on the finger of a subject, is driven by variable-frequency oscillator 13 at a selectable fixed flash rate 1/T having equal on and off times. A photographic time exposure of a manual operation, such as scanning a bar-coded document or passing a magnetic stripe document through a reader such as on the IBM 3604, then yields a photographic record of hand position as a function of time, as shown in Fig. 2.

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Hand Velocity Recording

The light-emitting diode (LED) 15, mounted on ring 11 and worn on the finger of a subject, is driven by variable-frequency oscillator 13 at a selectable fixed flash rate 1/T having equal on and off times. A photographic time exposure of a manual operation, such as scanning a bar-coded document or passing a magnetic stripe document through a reader such as on the IBM 3604, then yields a photographic record of hand position as a function of time, as shown in Fig. 2.

The hand motion appears as a series of exposed lines, the length and spacing of which are directly proportional to hand velocity. The lines at 17 represent the scanning action under test. The lines at 19 were created as the hand being monitored came to rest. The lines at 21 were created when the hand under test was withdrawn from the field of view. By placing a reference scale within this field of view, illuminated with constant low intensity or filtered light and by placing a filter on the camera which matches the light generated by LED 15, high resolution and accurate velocity and acceleration readings can be taken from the photographic recording.

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