Cassette detecting device and medium processing device using the same

1. A cassette detecting device comprising:

a main board comprising a first input unit, detecting whether a plurality of cassettes connected to the first input unit is mounted or detecting mounting positions of the plurality of cassettes, and outputting a result of the detecting; and

a plurality of cassettes wherein each of the plurality of cassettes stores a medium, each of the plurality of cassettes comprising a second input unit connected to the main board when each of the plurality of cassettes is mounted on a tray, and each of the plurality of cassettes obtaining a mounting position information according to a signal from the second input unit;

each of the plurality of cassettes and the main board comprises a comparing unit for obtaining the mounting position information of each of the plurality of cassettes;

wherein the main board comprises a first comparing unit for obtaining the mounting position information of each of the plurality of cassettes, wherein the first comparing unit includes a plurality of first comparators corresponding to the plurality of cassettes mounted, respectively; and

wherein each of the plurality of cassettes comprises a second comparing unit for obtaining the mounting position information of each of the plurality of cassettes, wherein the second comparing unit includes a plurality of second comparators corresponding to the plurality of cassettes to be mounted, respectively.

2. The cassette detecting device of claim 1 , wherein

a first voltage is applied to one end of each of the plurality of comparators in the main board;

a second voltage is applied to one end of each of the plurality of comparators in each of the plurality of cassettes; and

the first voltage is set to be greater than the second voltage.

3. The cassette detecting device of claim 2 , wherein

a supply voltage is applied to the first input unit of the main board through a first resistor; and

a supply voltage or a third voltage is applied to the other end of each of the plurality of comparator in the main board according to the mounting position of a cassette.

4. The cassette detecting device of claim 3 , wherein

a second resistor is connected to the second input unit of each of the plurality of cassettes grounded, and according to the mounting position of a corresponding cassette, the third voltage is applied or a ground voltage is connected to the other ends of comparators in each of the plurality of cassettes.

5. The cassette detecting device of claim 4 , wherein

a second voltage is applied to the one ends of the plurality of comparators in the plurality of cassettes; and

when the supply voltage is Vcc, the first resistor is R 1 , the second resistor is R 2 , the first voltage is a*Vcc, and the second voltage is b*Vcc, the first voltage and the second voltage are set to be

a*Vcc>Vcc*R 2/( R 1+ R 2) and b*Vcc<Vcc*R 2/( R 1+ R 2).

6. A cassette detecting device comprising:

a main board; and

a plurality of cassettes connected to the main board through a connector when each of the plurality of cassettes is mounted on a tray,

wherein the main board comprises:

a first input unit connected to the connector; and

a first comparing unit including a plurality of first comparators, each of the plurality of first comparators having one end connected to the first input unit and another end connected to a first voltage;

wherein each cassette comprises:

a second input unit connected to the connector; and

a second comparing unit including a plurality of second comparators, each of the plurality of second comparators having one end connected to the second input unit and other end connected to a second voltage;

wherein, among the plurality of first comparators, a third voltage is applied to one end of a first comparator corresponding to a position where a cassette is mounted,

wherein a supply voltage is applied to the one end of the first comparator corresponding to a position where the cassette is not mounted, and

wherein each main board obtains mounting position information of each of the plurality of cassettes by comparing outputs of the plurality of first comparators, and

wherein the cassette obtains the mounting position information of each of the plurality of cassettes by comparing outputs of the plurality of second comparators.

7. The cassette detecting device of claim 6 , wherein the first voltage is smaller than the supply power and is greater than the third voltage.

8. A medium processing device comprising:

a main board;

a plurality of cassettes connected to the main board when each of the plurality of cassettes is mounted on a tray, each of the plurality of cassettes storing a medium,

wherein the main board comprises:

a first input unit; and

a first comparing unit connected to the first input unit and comprising a plurality of first comparators corresponding to the plurality of cassettes, respectively;

wherein each of the plurality of cassettes comprises:

a second input unit connected to the first input unit; and

a second comparing unit connected to the second input unit and comprising a plurality of second comparators corresponding to the plurality of cassettes, respectively;

wherein each of the plurality of cassettes obtains mounting position information by comparing outputs of the plurality of second comparators, and

wherein the main board obtains the mounting position information of each of the plurality of cassette by comparing outputs of the plurality of first comparators.