JP3244566B2 - Recording / reproducing device for magnetic information - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a recording head and a reproducing head which are provided close to each other along the direction of transport of a magnetic recording medium, and simultaneously performs magnetic recording by the recording head and reproduction by the reproducing head. The present invention relates to a magnetic information recording / reproducing apparatus which is obtained.

[0002]

2. Description of the Related Art In recent years, magnetic recording media have become widespread as simple information transmission means. As an example,
2. Description of the Related Art Prepaid cards (prepayment cards) applied to ticket vending machines and public telephones installed in transportation and the like are known. This prepaid card is provided with a magnetic recording layer on which magnetic information such as frequency information corresponding to the purchase price and information on the remaining frequency of the frequency are magnetically recorded on a predetermined portion of a back surface of a rectangular plastic sheet or the like having a length of about several centimeters. ing.

On the other hand, a vending machine for a user to easily purchase such a prepaid card stores an unused prepaid card in which a purchase price is not recorded in advance, and according to a user's purchase instruction, The entered amount (for example, 1000 yen, 5000 yen, 1
0000 yen) is magnetically recorded on a magnetic recording layer by a recording head, and the magnetic recording information is read and reproduced by a reproducing head to confirm that there is no error in the magnetic recording information. Is provided to users as a prepaid card.

Further, after the prepaid card is inserted into the above-mentioned ticket vending machine or public telephone in which the prepaid card after purchase is used, the frequency corresponding to the price used by the user is subtracted, and further, the remaining amount is paid. A mechanism is provided for re-recording information on the remaining frequency on the magnetic recording layer and returning it to the user. That is, with the insertion of the prepaid card, the reproducing head reads and reproduces information on the remaining frequency of the magnetic recording layer,
The frequency corresponding to the price used by the user is subtracted from the remaining frequency to obtain a new remaining frequency, and the recording head re-records the information of the new remaining frequency on the magnetic recording layer. Then, the reproducing head reads and reproduces the re-recorded information of the new frequency remaining amount, and after confirming that there is no error in the magnetically recorded information, processing such as returning the prepaid card to the user is performed.

[0005] By the way, various devices to which the prepaid card is applied naturally have a built-in recording / reproducing device for performing magnetic recording and reading / reproducing. It is important to reduce the size and space of various devices.

Conventionally, in order to reduce the size of such a recording / reproducing apparatus, there has been known a recording / reproducing apparatus to which a combination head capable of performing the functions of magnetic recording and magnetic reproduction with a single head gap is used. That is, when the combination head is disposed at a predetermined position in the transport direction of the prepaid card, the advantage that space saving can be achieved as compared with the case where the recording head and the reproduction head are separately arranged side by side along the transport direction is utilized. Things.

When performing a series of mutually related processes such as magnetic recording on the above-described magnetic recording layer and confirming that there is no error in the recorded information, as shown in FIG. Was done in a simple procedure. First, when the user inserts the prepaid card into the insertion slot, as shown in FIG. 4A, the prepaid card PC is conveyed by the conveyance mechanism in the predetermined forward conveyance direction FW, and the combination provided in the conveyance mechanism is provided. The head CH sequentially reads and reproduces the magnetic information of the magnetic recording layer, and the transport mechanism moves the prepaid card PC to a position earlier than the combination head CH (right side of the combination head CH in the figure).
Transport completely. At this time, the combination head CH only functions as a reproducing head.

Next, when the user performs an operation such as purchasing a ticket, an arithmetic circuit or the like in the apparatus obtains a new remaining frequency by subtracting the frequency corresponding to the usage fee from the remaining frequency. After that, as shown in FIG. 4B, the transport direction of the transport mechanism is reversed so that the prepaid card P
C is transported in the reverse transport direction BW. In this case,
By operating the combination head CH as a recording head, information on the remaining frequency is recorded on the magnetic recording layer of the prepaid card PC.

Then, as shown in FIG. 4A again, when the prepaid card PC comes to the left of the combination head CH, the operation is switched by using the combination head CH as the reproducing head, and the transport direction of the transport mechanism is further changed. By performing reverse rotation (consequently transport in the forward transport direction FW), the combination head CH reads and reproduces the information (information on the remaining frequency) recorded on the magnetic recording layer of the prepaid card PC.

Next, the arithmetic circuit or the like compares the new frequency remaining information obtained by the above-described subtraction processing with the remaining frequency information read and reproduced by the combination head CH. By reversing the transport mechanism again, as shown in FIG.
Is transported in the reverse transport direction BW and returned to the user from the slot.

[0011]

However, the combination head itself has the advantage that it is small and can be used by selectively switching either the recording or reproduction function. In order to perform a series of processes required a plurality of times, the peripheral mechanisms such as the transport mechanism become complicated, and there is a disadvantage that control becomes extremely complicated, for example, it is necessary to repeat the forward / reverse transport operation. That is, in recording and reproducing the prepaid card, the relative speed between the card and the magnetic head must be naturally stabilized. However, in particular, while there are great restrictions on the size of the apparatus and the processing time, it is necessary to perform such stable recording and stable reproduction while performing forward and reverse rotation operations within a short transport distance. Secondary conditions arise, such as a motor with excellent responsiveness, an increase in motor torque, and an improvement in the motor driver circuit. As a result, it becomes necessary to use a larger motor, or a high-quality drive is required. This has the disadvantage of requiring a circuit.

Therefore, for the purpose of improving the controllability and simplifying the peripheral mechanism, a sufficient effect cannot be obtained by using the conventional combination head.

Therefore, the problem in the case where separate and independent recording heads and reproducing heads are arranged along the transport direction of the transport mechanism was reexamined.

First, when separate recording heads and reproduction heads are provided side by side, the relative distance between the recording head and reproduction head (the distance between the two in the transport direction) is sufficiently narrowed, and the distance between the recording head and the reproduction head is reduced. The most important task is to realize write error checking almost in real time by simultaneously processing the recording by the recording head and reading and reproducing by the reproducing head only by transporting the magnetic recording medium once in one specific direction. is there.

However, as shown in FIG. 5A, when the recording head WHD and the reproducing head RHD are simultaneously operated in a state in which the relative distance between the recording head WHD and the reproducing head RHD is sufficiently narrow, the electric field generated by the recording head WHD during magnetic recording. Leaks to the read head RD, and the leaked electric field becomes noise, so that the read head RHD
Is included in the reproduced signal. That is, as a result of the occurrence of crosstalk, there arises a problem that the accuracy of checking for recording errors is reduced.

Therefore, conventionally, as shown in FIG. 5 (b), the recording head WHD and the reproducing head RHD are arranged at an interval substantially equal to the length of the prepaid card PC in the transport direction, and the recording head WHD is prepaid. When the magnetic recording from the front end to the rear end of the card PC is completed, the recording head WHD is turned off and the recording head RHD is switched on so that the recording head RHD performs reading and reproducing without being affected by crosstalk. I was expecting perfection. However, this method cannot clearly realize a small-sized recording / reproducing apparatus.

The present invention provides a recording / reproducing apparatus which can solve the problem which could not be realized conventionally, that is, a reduction in the size of the recording / reproducing apparatus without causing a decrease in accuracy due to the crosstalk. That is the purpose.

[0018]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a magnetic recording head and a magnetic reproducing head disposed at a close position to receive a magnetic field generated by the magnetic recording head during magnetic recording. A magnetic information recording / reproducing apparatus having a magnetic recording head, wherein when the magnetic recording by the magnetic recording head and the reading / reproducing by the magnetic reproducing head are simultaneously performed, the reproduction signal read / reproduced by the magnetic reproducing head is read by the magnetic recording head. A predetermined threshold value between the noise signal level generated by the magnetic reproducing head under the influence of the magnetic field and the true signal level generated by the magnetic reproducing head without the influence of the magnetic field. Based on the comparison, a portion that exceeds a threshold value of the reproduction signal is determined to be a reproduction signal component.

Further, a high frequency cutoff filter for removing high frequency components higher than the frequency of the true signal from the reproduced signal output from the magnetic reproducing head and supplying the high frequency component to the comparing means is provided.

[0020]

According to the above construction, in the case of magnetic recording processing, and when the recorded information is read and reproduced in real time to determine an error in the recorded information, a recording head is generated during the magnetic recording. The read head receives the influence of the magnetic field and outputs a read signal including a crosstalk component (noise component due to the magnetic field). The read signal has a level higher than the level of the crosstalk component and lower than the level of the true read signal component. Based on the threshold value set in between, the actual reproduced signal is compared to generate a logical "H" or "L" logical signal, so that a logical signal from which a crosstalk component has been removed can be obtained. Therefore, since the crosstalk component is removed from the reproduction signal while allowing the reproduction head to be affected by the magnetic field from the recording head, it is possible to reduce the relative distance between the reproduction head and the recording head, and to reduce the size of the reproduction head. A recording / reproducing device can be realized.

Further, in addition to the means for removing the crosstalk component based on the threshold value, a means for removing a high-frequency component (a noise component due to a magnetic field) higher than the frequency of the true reproduced signal by a high-frequency removing filter is added. As a result, the removal of the crosstalk component can be promoted, and furthermore, the relative distance between the reproducing head and the recording head can be reduced, and a compact recording / reproducing apparatus can be realized.

Although the present invention can be applied to a recording / reproducing apparatus using separate recording heads and reproducing heads, the head gap for magnetic recording and the head gap for magnetic reproduction are arranged at a narrow interval. The present invention can also be applied to a recording / reproducing apparatus using a single magnetic head formed as described above, and exhibits an excellent effect of miniaturizing the apparatus.

Further, by applying a pair of independent combination heads arranged with a narrower relative interval, one of the combination heads is switched for magnetic recording and the other is switched for magnetic reproduction as appropriate. The present invention can be applied to a recording / reproducing apparatus that is operated, and can be downsized.

[0024]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration of the recording / reproducing apparatus, and FIG. 2 shows a timing chart of signals generated in respective components in the recording / reproducing apparatus. In this embodiment, separate recording heads WHD and reproduction heads RHD are arranged close to each other at extremely narrow intervals as compared with the length of a magnetic recording medium PC such as a prepaid card in the transport direction. A case where magnetic recording and error checking of recorded information thereof are processed in real time by transporting the medium PC from the recording head WHD side to the reproducing head RHD side is shown.

Various signal waveforms will be described with reference to FIG. 2 while describing the configuration of the recording / reproducing apparatus with reference to FIG.
Recording head WHD is recorded information signal S _W after FM modulation supplied from the drive circuit DC according to well known techniques is supplied,
Its by generating a magnetic field corresponding to the current change of the recording information signal S _W, recording the record information signal S _W on the magnetic recording layer of the magnetic recording medium PC that has been transported.

On the other hand, the reproducing head RHD reads the magnetic recording layer of the magnetic recording medium PC that has been conveyed, and outputs a reproduced information signal S _R. That is, recording by the recording head WHD and reading and reproduction by the reproducing head RHD are performed in real time.

Furthermore, the output terminal a of the reproducing head RHD, to b, in the record information signal S _W to passes the frequency component of the true reproduction signal corresponding, desired signal by removing the higher the high frequency component A high-frequency cutoff filter that amplifies and outputs the signal to a level is connected.

This high-frequency cutoff filter has a capacitor C1 connected in parallel between the output terminals a and b, and a resistor R1 connected to the output terminal a.
And the output terminal b is connected to the inverting input terminal
2, a differential amplifier 1 connected to the non-inverting input terminal via the input terminal 2 and a capacitor C2 and a resistor R3 connected in parallel with each other between the inverting input terminal and the output terminal of the differential amplifier 1.
A capacitive element C3 and a resistor R4 connected in series with each other between the output terminal of the differential amplifier 1 and the reference voltage source _VREF ;
The configuration includes a resistor R5 and a capacitor C4 connected in parallel with each other between the non-inverting input terminal of the differential amplifier 1 and the reference voltage source _VREF .

Here, the reference voltage source V _REF is for setting a DC bias of the reproduction information signal S _R , and is set to a voltage which is about half of the operation supply voltage. Capacitive element C
2 and the resistor R3, of the reproduced information signal S _R is input, a reference voltage source V upper cutoff frequency for removing high frequency components contained in the signal having an amplitude on the plus side with respect _REF f _HC Is the value to set. On the other hand, the capacitive element C4
And resistor R5 of the reproduced information signal S _R is input, to the negative side with respect to the reference voltage source V _REF a high cutoff frequency f _LC for removing high frequency components contained in the signal having an amplitude It is the value to be set. The resistor R4 is provided for setting the DC bias of the output terminal of the capacitor C3. The specific values of each element in this example are C1 = 222 pF, R1 = R2 = 4.7 kΩ,
C2 = C4 = 221 pF, R3 = R5 = 100 kΩ, C
3 = 1 μF, R4 = 30 kΩ, and V _REF = 2.5 V
And the differential amplifier 1 is LM358 (op-amp)
Has been applied.

Next, a pair of comparison circuits are connected in parallel to the output terminal of the capacitive element C3 of the high-frequency cutoff filter.

One comparison circuit has an inverting input terminal connected to the output terminal of the capacitor C3, a non-inverting input terminal connected to the first variable voltage circuit 2 via the resistor R5, and a non-inverting input terminal. The comparator 3 has a resistor R6 connected between the terminal and the output terminal. The other comparison circuit has a non-inverting input terminal connected to the output terminal of the capacitive element C3 via the resistor R7, an inverting input terminal connected to the second variable voltage circuit 4, and an inverting input terminal and an output terminal. And a comparator 5 to which a resistor R8 is connected.

Here, the comparator 3 includes a first threshold voltage V _TH supplied from the first variable voltage circuit 2 and a plus signal component (reference voltage source V A signal component having an amplitude on the positive side with respect to _REF )
Is compared with the amplitude HV, and if HV ≧ _VTH , the logic “H”;
If HV <V _TH , a logic signal D _H which becomes logic “L” is output. Further, the first variable voltage circuit 2 controls the control input signal X
And outputs a threshold voltage V _TH corresponding to _TH, different control input signal X indicated value from the control means, such as a microprocessor
_{When TH} is supplied, a different threshold voltage _VTH corresponding to the specified value is output.

The threshold voltage V _TH applied to the magnetic recording process and the case where the recorded information is read / reproduced in real time to determine an error in the recorded information is determined by the above high-frequency range. The voltage level is set to a voltage level V _TH 'which is higher than the maximum voltage level of the noise component passing through the cutoff filter and lower than the voltage level of the true reproduced signal component. Further, the threshold voltage V _TH changes the distance between the recording head WHD and the reproducing head RHD in various ways, and also changes the threshold voltage V _{TH in} various _ways . The correlation between the crosstalk occurrence probabilities according to the differences is experimentally obtained in advance, and the optimum threshold voltage V _TH that can reduce the crosstalk most at various intervals is determined. The threshold voltage V _TH is used.

On the other hand, the comparator 5 includes a second threshold voltage V _TL supplied from the second variable voltage circuit 4 and a negative signal component (reference voltage source V _REF) input to the non-inverting input terminal. logic signal D by comparing the amplitude HL signal component) having an amplitude on the negative side, the HL ≦ V _TL if the logic "H", HL> V _TL If logic "L" with respect to
Output _L. Furthermore, the second variable voltage circuit 4 outputs a threshold voltage V _TL corresponding to the control input signal X _TL, when supplying different control input signal X _TL indicated value from the control means such as a microprocessor, designated A different threshold voltage _VTL corresponding to the value is output.

The threshold voltage _VTL applied to the magnetic recording process and the case where the recorded information is read / reproduced in real time to determine an error in the recorded information is a threshold voltage _VTL. It is predetermined in the same manner as _VTH . That is, the voltage level is set to a voltage level V _TL ′ lower than the lowest voltage level of the noise component passing through the high-frequency cutoff filter and higher than the voltage level of the true reproduced signal component.

Note that the first and second variable voltage circuits 2 and 4
For example, an A / D converter that generates threshold voltages V _TH and V _TL by converting digital control input signals X _TH and X _TL into an analog signal, and a ladder resistor that controls the control input signals X _TH and X _TL
A resistor network circuit that generates threshold voltages V _TH and V _TL by selecting with _TL , and an analog switch that is switched by control input signals X _TH and X _TL by generating a plurality of threshold voltages in advance. The desired threshold voltage V _TH , X
_A circuit with a built-in multiplexer that generates a voltage for _TL , a so-called voltage regulator, or the like is applied.

In this embodiment, the values of the elements used in these comparison circuits are R5 = R7 = 4.7 kΩ, R6
= R8 = 100 kΩ, and LM339 (operational amplifier) is applied to both the comparators 3 and 5.

In this embodiment, the recording head W
The threshold voltages V _TH ′ and V _TL ′ for simultaneously operating the HD and the read head RHD are V _TH ′ = 2.85 V,
V _TL ′ = 2.15V. The threshold voltage V _TH '
According to V _TL 'and the maximum frequency is 2.5kHz recording information signal S _W, the coercive force is at 3000 oersteds,
The distance between the recording head WHD and the reproducing head RHD is 50 mm
Can be

Next, the output terminal of the comparator 3 is connected to one input terminal of a two-input OR gate 6 via a pull-up resistor R9 and a capacitor C5, and the output terminal of the other comparator 5 is connected to a pull-up resistor. R10 and capacitive element C6
Through the NOT gate, and is connected to the other input terminal of the two-input OR gate 6, and the OR output _DHL of the two-input OR gate 6 is supplied to the frequency dividing circuit 7 composed of a D-type flip-flop, circuit 7 outputs as a true reproduction signal D _R. Then, by supplying the reproduced signal D _R to the control circuit having an arithmetic processing function, such as for example a microprocessor, by an analysis process, whether the recording information signal S _R is reliably recorded on the magnetic recording medium PC Make a judgment.

The reproducing head RHD is replaced with the recording head WHD.
If not simultaneously operated, for example, the reproduction head RHD
When performing only reading and reproducing the magnetically recorded information by the control by the input signal X _TH, the first variable voltage circuit 2 of the threshold voltage V _TH of the above threshold voltage V _TH is lower than 'voltage V _TH "(V _TH '> V _TH "> V _REF )
The threshold voltage V _TL of the second variable voltage circuit 4 is changed to a voltage V _TL ”(V _TL ′ <V _TL ” <V _REF ) higher than the threshold voltage V _TL ′ by the control input signal X _TL . Switch (Fig. 2
See). That is, in this case, since the reproducing head RHD does not receive the magnetic field from the recording head WHD, reliable reproduction is realized by strictly setting the reproducing conditions based on the threshold voltages V _TH ″ and V _TL ″. is there.

As described above, according to this embodiment, while allowing the reproducing head to be affected by the magnetic field from the recording head, even if the reproducing head RHD receives the magnetic field from the recording head WHD, the reproducing is actually performed. Since a crosstalk component can be removed from the reproduced signal S _R thus obtained, the relative distance between the reproducing head RHD and the recording head WHD can be reduced, and a small-sized recording / reproducing apparatus can be realized.

Next, as a specific example, a ticket vending machine to which the recording / reproducing apparatus of this embodiment is applied will be described with reference to FIG. Although this specific example is an example in which a user purchases a ticket or the like using a prepaid card in an automatic ticket vending machine, the recording / reproducing device simply subtracts or collects the prepaid card inserted by the user. In addition to performing such processing, a card release function for creating and issuing a coupon card or a prepaid card of a desired amount in accordance with a user's selection operation is also provided.

First, the structure will be described with reference to FIG. 3. A base paper card (which has a heat-sensitive recording layer on the front surface and the back surface, which becomes a prepaid card or a coupon card of various amounts after information is recorded by processing described later, (With a magnetic recording layer on the back)
, A card collection box 120 for storing a bad ticket, and a card collection box 130 for collecting used prepaid cards. Is provided.

The first card cassette accommodating section 10
0, 2nd card cassette accommodation section 110, ticket collection box 12
0, first to sixth transport mechanisms I, II, III, IV for transporting a ticket or a prepaid card between the card collection box 130 and the card slot 140 by a transport roller group around which a transport belt is wound. , V, and VI are provided.
These transport mechanisms are independently driven, and the transport direction is reversible. In the drawing, the transport rollers A and B are shown as representative examples, and the forward transport direction (that is,
The direction of transport based on the user's card insertion) is F
W, the reverse transport direction (that is, the direction in which the card is transported when returning the card to the user) is BW.

Further, in each of the transport mechanisms I to VI, a plurality of photosensors each composed of a combination of a light emitting element and a light receiving element are installed at various places in order to control the transport timing. In the drawings, a light emitting element EL and a light receiving element PD are shown as typical examples. Further, at the end of the third transport mechanism III, only one of the base papers transported from the first and second transport mechanisms I and II is selectively transported to the third transport mechanism II.
A branch claw 180 for transporting the ticket or prepaid card transported in the forward transport direction FW is provided at one end of the fourth transport mechanism IV.
The branch claws 190 and 200 for switching the conveyance only to one of the conveyance mechanisms II, the fifth conveyance mechanism V, and the sixth conveyance mechanism VI are rotatably provided.

The third transport mechanism III further includes a punch unit 150 having a function of punching a hole in a part of the prepaid card in accordance with the remaining amount of the card deducted when the user purchases the ticket, A print head 160 that prints on the front surface according to the type of the prepaid card and a print head 170 that also prints on the back surface are provided. The fourth transport mechanism IV includes a recording head WH for recording magnetic information on a magnetic recording layer on the back of a ticket or a prepaid card.
D and a reproducing head RHD for reading magnetic information of a magnetic recording layer on the back surface of a ticket or a prepaid card are provided. still,
The arrangement interval between the recording head WHD and the reproducing head RHD in the transport direction is sufficiently narrower than the lengths of the ticket and the prepaid card, and the input terminal of the recording head WHD and the output terminal of the reproducing head RHD are shown in FIG. The electrical circuit is connected.

Next, an operation example of a ticket vending machine having such a mechanism will be described. For example, when the user inserts the prepaid card into the insertion slot 140, the fourth transport mechanism IV transports the card in the forward transport direction FW.
The HD reads and reproduces information on the magnetic recording layer of the prepaid card and transmits the information to a control means such as a microprocessor. At this time, the threshold voltage of the circuit shown in FIG. 1, V _TH =
V _TH ”and V _TL = V _TL ” are set, and the operation of the recording head WHD is stopped.

The control means identifies the balance of the prepaid card from the read information and, if there is a valid balance, controls the branch claws 190 and 200 to transfer the prepaid card to the third transport mechanism. After being conveyed to the III side and conveyed to the vicinity of the card cassette accommodating section 100 in the figure, the conveying operation of the third conveying mechanism III is temporarily stopped.

Next, when the user presses a button (not shown) for the amount of the ticket (such as a ticket) to be purchased, the calculating means calculates the difference between the balance and the specified amount. If the number is small, the third transport mechanism II is immediately used.
By switching I and the fourth transport mechanism IV to the operation in the reverse transport direction BW, the prepaid card is transported to the insertion slot 140 and returned, and a display indicating that the balance is insufficient is displayed on a panel display (not shown). And so on.

On the other hand, when the balance is larger than the designated amount (when a ticket can be purchased), the process shifts to a normal ticketing process. That is, first, processing for transporting the prepaid card to the insertion slot 140 and returning it is performed. However, at the time of this return processing, the punch unit 150 punches a hole corresponding to the balance at one end of the prepaid card.
Prints printing information such as the date and time of purchase and the balance on the back of the prepaid card, and furthermore, the recording head WHD magnetically records the magnetic recording information such as date and time of use and the balance on the magnetic recording layer of the prepaid card. The RHD reads and reproduces the magnetic recording information on the magnetic recording layer, and when there is no abnormality in the recording information, the prepaid card is immediately conveyed to the insertion slot 140. However, if an abnormality is detected in the recorded information,
The fourth transport mechanism IV and the third transport mechanism III switch to the operation in the forward transport direction FW halfway, and return the prepaid card to the third transport mechanism III. Then, the state is switched again to the reverse transport direction BW, and the magnetic recording by the recording head WHD and the reproduction / inspection processing by the reproduction head RHD are performed, and the prepaid card in a state without any abnormality is returned.

[0051] Incidentally, when the reproduction and inspection process by the magnetic recording and reproducing head RHD by the recording head WHD are simultaneously performed, the threshold voltage of the circuit shown in FIG. 1, V _TH =
V _TH ', V _TL = V _TL ' are set. Therefore, even if the reproducing head RHD receives a magnetic field from the recording head WHD, it is possible to accurately read the magnetic recording information from the magnetic recording layer of the prepaid card and to read the reproducing head RH
Even if the relative distance between D and the recording head WHD is small, no crosstalk occurs.

As described above, while the information updating process of the prepaid card is being performed, a ticket is issued by a separate printing device (not shown).

As described above, if the recording / reproducing apparatus of this embodiment is applied as described in this specific example, the recording head WHD and the reproducing head RHD can be brought close to each other and magnetic recording and reproduction can be performed simultaneously. Since it is not affected by crosstalk, magnetic recording and its inspection processing can be performed only by performing one-time transport processing in one direction, and control can be simplified. Further, since the distance between the recording head WHD and the reproducing head RHD is reduced, the space saving and the miniaturization of those devices can be realized by applying to various devices.

In this embodiment, a case is shown in which separate and independent recording heads and reproducing heads are applied. However, the present invention is not limited to this. For example, a head gap for magnetic recording and a magnetic head may be used. The present invention can also be applied to a recording / reproducing apparatus using a single magnetic head in which reproducing head gaps are arranged at narrow intervals, and exhibits an excellent effect of miniaturizing the apparatus. Further, by applying a pair of independent combination heads arranged with a narrower relative interval, one combination head may be appropriately switched for magnetic recording and the other combination head may be switched for magnetic reproduction for operation. The present invention can be applied to various recording / reproducing apparatuses, and can be downsized.

[0055]

According to the present invention as described above,
A read signal read and reproduced by the read head is a level between a noise signal level generated by the read head under the influence of the magnetic field from the recording head and a true signal level generated by the read head without the influence of the magnetic field. And a comparison means for comparing a portion of the reproduction signal exceeding the threshold value with a reproduction signal component, or a reproduction signal output by a reproduction head. From
Since the high frequency cutoff filter that removes high frequency components higher than the true signal frequency and supplies the high frequency cutoff filter to the comparison means is provided, the read head is affected by the magnetic field generated by the write head during magnetic recording. Even if a reproduced signal including a crosstalk component (a noise component due to a magnetic field) is output, the noise component can be separated and removed based on the threshold value.

Therefore, since the crosstalk component is removed from the reproduction signal while allowing the reproduction head to be affected by the magnetic field from the recording head, the relative distance between the reproduction head and the recording head can be reduced. Thus, a compact recording and reproducing apparatus can be realized.

Further, in addition to the means for removing the crosstalk component based on the threshold value, a means for removing a high-frequency component (a noise component due to a magnetic field) higher than the frequency of the true reproduced signal by a high-frequency removing filter is added. As a result, the removal of the crosstalk component can be promoted, and furthermore, the relative distance between the reproducing head and the recording head can be reduced, and a compact recording / reproducing apparatus can be realized.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a configuration of an embodiment of a recording / reproducing apparatus according to the present invention.

FIG. 2 is a timing chart for explaining the operation of the circuit of FIG. 1;

FIG. 3 is a configuration explanatory diagram showing a main configuration of a ticket vending machine to which the recording / reproducing device of the embodiment is applied.

FIG. 4 is an explanatory diagram for explaining a problem of the related art.

FIG. 5 is an explanatory diagram for further explaining a problem of the related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Differential amplifier, 2,4 ... Variable voltage circuit, 3,5 ... Comparator, 6 ... 2-input OR gate, 7 ... Division circuit, WH
D: recording head, RHD: reproducing head, R1 to R10 ...
Resistance, C1 to C6: Capacitance element, 100, 110: Card cassette housing part, 120: Ticket collection box, 130: Card collection box, 140: Slot, 150: Punch unit, 16
0, 170: print head, 180, 190, 200: branch claw.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 5/09

Claims (2)

(57) [Claims] 1. A magnetic information recording / reproducing apparatus comprising: a magnetic recording head; and a magnetic reproducing head disposed at a close position to receive a magnetic field generated by the magnetic recording head during magnetic recording. When read and reproduction by the magnetic reproduction head are performed simultaneously, the reproduction signal read and reproduced by the magnetic reproduction head is converted into a noise signal level generated by the magnetic reproduction head under the influence of the magnetic field from the magnetic recording head. A comparison is made based on a preset threshold value at a level between the true signal level generated by the magnetic reproducing head without being affected by a magnetic field, and a portion of the reproduction signal exceeding the threshold value is compared. A recording / reproducing apparatus for magnetic information, comprising comparison means for determining a reproduction signal component. 2. A high frequency cutoff filter for removing a high frequency component higher than a true signal frequency from a reproduced signal output by the magnetic reproducing head and supplying the same to the comparing means. Item 2. A magnetic information recording / reproducing apparatus according to Item 1.