Browse Prior Art Database

Coin Diameter Detector

IP.com Disclosure Number: IPCOM000114638D
Original Publication Date: 1995-Jan-01
Included in the Prior Art Database: 2005-Mar-29
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Nomura, Y: AUTHOR

Abstract

Disclosed is a Coin Knurl Detector which has a set of optical sensor located in a coin feed pass for a Coin Distinction System. The Coin Knurl Detector provides a contactless detection of a coin knurl utilizing reflection of light from a coin edge through an optical slit.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 81% of the total text.

Coin Diameter Detector

      Disclosed is a Coin Knurl Detector which has a set of optical
sensor located in a coin feed pass for a Coin Distinction System.
The Coin Knurl Detector provides a contactless detection of a coin
knurl utilizing reflection of light from a coin edge through an
optical slit.

      The Figure shows the example of this method.  One set of
optical sensor (1)(2) which are composed of luminescnece device and
optical detector device respectively, such as light emitting diode
and photo transistor, are located in the coin feed pass.  An optical
slit (3) is located between the coin feed pass and the optical
detector.  When a coin is fed in the coin feed pass, light of the
luminescence device (1) reflects off the coin edge.  The reflected
light through the optical slit (3) is focused on the optical detector
(2), then the optical detector (2) outputs an analogue signal
(OUTOUT1).  Each up/down peak point of this signal (OUTPUT1)
corresponds to the coin knurls of edge.  When a coin has no knurl in
edge, these up/down peaks do not appear on the OUTPUT1.  Peak Timing
detection circuit (4) converts a digital output signal (OUTPUT2) from
High level to Low level or from Low level to High level at each peak
point of OUTPUT1.  Counter circuit (5) counts these High and Low
conversion on this digital signal OUTPUT2.  The Coin Distinction
System utilizes an output value of the Counter circuit (5) as a not
only knurl existence but also quantitative valu...