JP3282104B2 - Recorded information reading device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recorded information reading apparatus for reading magnetic information recorded on a magnetic recording medium such as a magnetic card.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, there is a reading apparatus of this type which reads magnetic information recorded on a magnetic recording medium 10 such as a magnetic card. In the reading device, a detection coil 12 is wound around a core 11 which is a magnetic material, and a current is supplied from the constant current circuit 13 to the detection coil 12 to generate a predetermined voltage.
The voltage is changed in accordance with the magnetic information of the magnetic card 10 moving in the vicinity, and the voltage change is used to remove the DC component.
The signal was amplified by the amplifier 15 via the C-cut capacitor 14 and output. That is, in this reading device, the core 11
Since the voltage corresponding to the rate of change of the surface magnetic flux of the magnetic card 10 passing near the gap 11a is sequentially induced in the detection coil 12, the voltage is output from the amplifier 15 and used as magnetic information.

[0003]

However, in the above-mentioned reading apparatus, since a DC cut capacitor for removing a DC component of a voltage is used, there has been a problem that responsiveness of reading magnetic information is deteriorated .

The present invention has been made in view of the above circumstances, and has as its object to provide a recording information reading apparatus which can improve the response of reading magnetic information recorded on a magnetic recording medium.

[0005]

According to the present invention, there is provided a bias coil wound around a magnetic body.
And a constant voltage generator that applies a constant voltage to this bias coil.
Means for winding the magnetic material separately from the bias coil.
Turned and moved near the gap provided in the magnetic body
According to the magnetic information recorded on the magnetic recording medium
A detection coil that induces pressure and two ends of this detection coil
Input terminals are directly connected to amplify and output the above induced voltage.
And a recorded information reading device provided with an amplifier .

[0006]

[Function] 0 when the magnetism of the magnetic card is not detected.
The voltage value of the constant voltage circuit is adjusted so as to obtain an output voltage of [V], a predetermined voltage is generated in the detection coil, and when the magnetic card passes by the vicinity, the magnetic information recorded on the magnetic card is obtained. The voltage of the detection coil is changed according to the information, and the voltage is output.

Therefore, if a voltage change from the detection coil is detected by the constant voltage driving method, magnetic information can be obtained from a magnetic card passing nearby without using a DC cut capacitor.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a configuration diagram showing an example of a configuration of a recording information reading device according to the present invention. In the figure, a recorded information reading device includes a core 21 having a gap 21a, a bias coil 22 wound around the core 21, a detection coil 23 wound around the core 21 separately from the bias coil 22. , A constant voltage circuit 24 connected to the DC power supply and the bias coil 22, and an amplifier 25 for amplifying the voltage output from the detection coil 23.

That is, a bias coil 22 and a detection coil 23 are separately wound around the core 21, and the bias coil 22 has a DC bias of a predetermined constant voltage generated by a constant voltage circuit 24. Voltage is applied. Note that the DC bias voltage of the constant voltage circuit 24 is
In a state where the magnetism of the magnetic card 20 is not detected, the output voltage from the amplifier 25 is adjusted to be 0 [V]. When the recording information reading apparatus of the present invention is used for reading bar code information, the DC bias voltage is set such that the output voltage from the amplifier 25 becomes the peak value when the magnetism of the magnetic card 20 is detected. It has been adjusted to be.

In this state, when the magnetic card 20 passes near the gap 21a of the core 21, the voltage corresponding to the rate of change of the surface magnetic flux of the magnetic card 20 is applied to the detection coil 23.
Are sequentially induced. The amplifier 25 amplifies the induced voltage and outputs the amplified voltage to, for example, a magnetic information recognition device (not shown). The magnetic information recognition device recognizes the output voltage as magnetic information.

Therefore, in this embodiment, the bias coil and the detection coil are separately separated and wound around a magnetic material, and the magnetic information recorded on the magnetic card is detected by the constant voltage drive, so that a DC cut capacitor is not required. Thus, the responsiveness of reading the magnetic information can be improved .

Further, the recorded information reading apparatus according to the present invention can be used for recognizing bills using magnetic ink. In this case, the above-described effects can be obtained. The core 21, the bias coil 22 and the detection coil 23 constitute a magnetic head. This magnetic head is separated from the one shown in FIG. 1, for example, as shown in FIG. The bias coil 22 and the detection coil 23 may be configured to be wound around the same position on the core 21. In this case, the bias coil 22 and the detection coil 23 can be wound around the core at the same time, and the time required for winding can be reduced.

[0013]

As described above, according to the present invention, magnetic
A bias coil wound around the body and the bias coil
Constant voltage generating means for applying a constant voltage to the
And wound around the magnetic body, and set on the magnetic body.
On a magnetic recording medium that moves near the gap
Coil that induces a voltage according to the magnetic information
And its input terminals are directly connected to both ends of this detection coil.
In addition , since an amplifier for amplifying and outputting the induced voltage is provided, a DC cut capacitor is not required, and the responsiveness of reading magnetic information recorded on a magnetic recording medium can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an example of a configuration of a recording information reading device according to the present invention.

FIG. 2 is a configuration diagram showing another embodiment of the magnetic head unit shown in FIG. 1;

FIG. 3 is a configuration diagram showing a configuration of a conventional recording information reading device.

[Explanation of symbols]

 10, 20 Magnetic recording medium (magnetic card) 11, 21 Magnetic body (core) 11a, 21a Gap 12, 23 Detection coil 13 Constant current circuit 14 DC cut capacitor 15, 25 Amplifier 24 Constant voltage circuit

Claims (1)

(57) [Claims] A bias coil wound around a magnetic body; and a constant voltage generating means for applying a constant voltage to the bias coil.
And wound around the magnetic body separately from the bias coil,
A magnet moving near a gap provided in the magnetic body
Induces a voltage according to the magnetic information recorded on the recording medium
Detection coil and its input terminals are directly connected to both ends of this detection coil.
A recording information reading device comprising: an amplifier that amplifies and outputs the induced voltage .