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Browse Prior Art Database

Autolock "pick" Detector

IP.com Disclosure Number: IPCOM000101639D
Original Publication Date: 1990-Aug-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 4 page(s) / 65K

Publishing Venue

IBM

Related People

Ulrich, SD: AUTHOR [+2]

Abstract

Disclosed is a circuit designed to remotely determine the physical action of an autolock mechanism.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 97% of the total text.

Autolock "pick" Detector

       Disclosed is a circuit designed to remotely determine the
physical action of an autolock mechanism.

      The Autolock "Pick" Detector is composed of the following
building blocks:
      1.  Voltage Follower
      2.  Two Gain Stages
      3.  Differentiator
      4.  Two Monostable Multivibrators

      The Voltage Follower (A) (see Fig. 1) allows the autolock coil
5 to be stimulated at various voltage levels. The first Gain Stage
(B) amplifies the current profile as detected via a one-ohm sense
resistor (Ohm's Law relationship) placed in series with the autolock
coil 5. The Differentiator (C) produces a voltage spike if the
autolock picks (mechanical movement detected).  The spike is a
consequence of the autolock catch (metal arm) passing through the
autolock coil 5 magnetic field.  If no mechanical movement occurs,
then the Differentiator's output remains at approximately zero volts.
No field disturbance detected.  The second Gain Stage (D) conditions
and amplifies the voltage spike to trigger a Monostable Multivibrator
(E) when the voltage spike occurs.  This is used to drive an LED
indicator or Latch or DI port (any device capable of accepting a TTL
level signal).  The second Monostable Multivibrator is used to
produce a scan window if time-to-pick is desired (optional).  Please
refer to the current/ voltage profiles (see Figs. 2, 3, 4 and 5) by
section for typical output information under eith...