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(11) | EP 1 241 636 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Coin discriminator for coin made of plural materials |
| (57) To present a discriminating apparatus for metal piece formed of plural materials
of very high reliability capable of discriminating securely a metal piece formed of
plural materials such as clad coin or bicolor coin with very high reliability. A metal
piece detection sensor comprising a reflection type detection sensor disposed at one
sliding surface side of a passage of a metal piece formed of plural materials, a first
transmission type detection sensor disposed so as to hold one lataral end of the passage
and a second transmission type detection sensor disposed so as to hold other lateral
end of the passage, with the passage being made of a conductive material, in which
discriminating means for discriminating the metal piece on the basis of an output
of the metal piece detection sensor is further provided, and excitation signals of
plural frequencies are supplied to a primary coil of the reflection type detection
sensor, a primary coil of the first transmission type detection sensor, and a primary
coil of the second transmission type detection sensor, and the discriminating means
discriminates the metal piece passing the passage on the basis of an output of a secondary
coil of the reflection type detection sensor, an output of a secondary coil of the
first transmission type detection sensor, and an output of a secondary coil of the
second transmission type detection sensor. |