JPS583286B2 - magnetic recording and reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel magnetic recording/reproducing device in which a magnetic recording head is replaceable.

A conventional magnetic recording/reproducing device has a configuration in which a magnetic erasing head, a magnetic recording head, and a magnetic reproducing head are in contact with a magnetic tape that is fed at a constant speed by a drive device, and the magnetic erasing head and the magnetic recording head A high frequency current generation circuit is provided for supplying erase current and bias current.

It is well known that in a magnetic recording/reproducing apparatus constructed in this way, the type of magnetic recording head and the value of the bias current for this recording head are important factors that determine the performance of magnetic recording.

In general, magnetic recording/reproducing devices are designed by setting a bias current value that is appropriate for the type of magnetic recording head used (classified in particular by the material of the head core). When head replacement is required, it is limited to the same type of head.

Further, even if the heads are of the same type, it is difficult to replace the heads because the optimum bias current value differs due to variations in the characteristics of the individual heads.

Due to these circumstances, the current situation is that heads have not been replaced in the past, and even if they were, it was done as a repair and depended on the manufacturer or service organization.

Therefore, part of the performance of conventional magnetic recording and reproducing devices is determined by the magnetic recording head installed by the manufacturer, and it is extremely difficult for the user (consumer) to derive better or different performance. It was a business.

The present invention eliminates the above-mentioned drawbacks and provides a novel magnetic recording/reproducing apparatus in which the magnetic recording head can be replaced by the user.

Embodiments of the magnetic recording and reproducing apparatus according to the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of this.

In the figure, a magnetic recording/reproducing head 11 is coupled to the output side of a recording bias current supply circuit device 12 made as a solid-state circuit component.

The magnetic head 11 and the circuit device 12 are integrally coupled as a structure.

The circuit device 12 includes a bias current setting circuit 13 for setting an appropriate bias current for the magnetic recording head 11, such as an amplifier circuit or an attenuation circuit, and a stable output circuit 14, such as a limiter, connected to the input side of the bias current setting circuit 13. It is inclusive.

The input side of this stable output circuit 14 is coupled to connection terminals 15, 16, and has the function of converting fluctuations in the input current applied to these connection terminals 15, 16 into a constant output.

The magnetic recording/reproducing head 11 is connected to other connection terminals 19.19 through signal circuits 17.18 inside the circuit device 12.
20.

Thus, the magnetic head 11 and the circuit device 12 are integrally combined and the entire unit is configured as a head device.
The connection terminals 15, 16, 19, and 20 allow connection and disconnection to other circuits, which will be described below.

Connection terminals 15 and 16 of the circuit device 12 are coupled to the output side of an oscillation circuit 22 via a first recording/reproducing switch 21 .

The output side of this oscillation circuit 22 is branched to the magnetic erasing head 2.
Combined with 3.

Other connection terminals 19 and 20 of the circuit device 12 are connected to a switch of a second recording/reproduction switch 24.

A first fixed terminal 25 and a third fixed terminal 27 of this switch 24 are coupled to the input side of a recording/reproducing amplifier circuit 29.
The second fixed terminal 26 and the fourth fixed terminal 28 are coupled to the output side of the amplifier circuit 29.

The input side of the amplifier circuit 29 is further connected to a recording signal input terminal 30.
The output side is coupled to a speaker 31.

Next, the operation will be explained.

When the first switch 21 and the second switch 24 are set as shown in the figure, the magnetic recording and reproducing apparatus is in the "reproducing state".

In this state, the magnetic head 11 functions as a reproducing head that detects magnetism from the magnetic tape 10, and this reproducing output is led out to the connection terminals 19, 20 through the signal circuits 17, 18 in the circuit device 12, and further to the second The switch 24 is applied to the amplifier circuit 29 via the first fixed terminal 25 and the third fixed terminal 27.

The reproduced signal amplified by the amplifier circuit 29 is supplied to the speaker 31 from its output side and drives the speaker 31.

The output of the oscillation circuit 22 is cut off by opening the first switch 21 and is not supplied to the circuit device 12 and the magnetic erasing head 23.

Next, by switching the first switch 21 and the second switch 24 to the opposite side from the illustrated state, the magnetic recording/reproducing apparatus enters the "recording state".

The output of the oscillator circuit 22 is supplied via the first switch 21 to the magnetic erasure head 23 and to the connection terminals 15 , 16 of the circuit arrangement 12 .

This is applied as an erase current to the magnetic erase head 23.
The circuit device 12 is supplied with a recording bias current.

The current supplied to the connection terminals 15, 16 of the circuit arrangement 12 is applied to a stable output circuit 14 inside the circuit arrangement 12, where it is taken out as an output at a predetermined stable level.

A bias current setting circuit 13 inside the circuit device 12 receives the current at the stable level and outputs a recording bias current suitable for the magnetic recording head 11 and supplies it to the magnetic head 11.

On the other hand, the recording signal applied to the signal input terminal 30 is amplified by the amplifier circuit 29, and from the output side of the amplifier circuit 29 to the second fixed terminal 26 and the fourth fixed terminal 2 of the second switch 24.
8 to the connection terminals 19.20 of the circuit arrangement 12.

The signals supplied to the connection terminals 19 and 20 are supplied to the magnetic head 11 through signal circuits 17 and 18 inside the circuit device 12.

The magnetic head 11 thus operates as a recording head and performs magnetic recording on the magnetic tape 10.

As described above, magnetic recording and reproduction are performed, and especially in the "recording state", the circuit device 12 supplies an appropriate bias current to the magnetic head 11, and the circuit device 12 supplies a suitable bias current to the connection terminals 15 and 16 of the circuit device 12, so to speak. A predetermined bias current can be obtained for variations or differences in the current applied.

Therefore, by setting an appropriate bias current for the magnetic head 11 by the bias setting circuit 13 inside the circuit device 12, it is possible to obtain an appropriate bias current for the magnetic head 11 regardless of the difference in the output of the oscillation circuit 22.
Any exchange is possible.

The magnetic head 11 includes, for example, a permalloy head, a sendust head, and a ferrite head, but for any of the heads, when manufacturing a unitized head device by integrally combining the circuit device 12 and the magnetic head 11, the circuit device 1 is used.
All kinds of magnetic heads can be used by setting a bias current suitable for the head to be used by adjusting only the bias current setting circuit 13 inside the magnetic head.

Therefore, various unitized head devices including the magnetic head 11 and the circuit device 12 can be prepared, and by replacing this head device, it becomes possible to easily replace the magnetic recording head in the magnetic recording/reproducing device, and the user ( Heads can be replaced on the consumer's side.

FIG. 2 shows another embodiment of the magnetic recording/reproducing apparatus according to the present invention.

The magnetic recording/reproducing head 11 is coupled to the output side of an oscillation circuit 41 provided inside the circuit device 12 .

The B voltage circuit of this oscillation circuit 41 is coupled to connection terminals 43 and 44.

The output side of the oscillator circuit 41 is also coupled to the input side of a high input impedance amplifier circuit 42.

The output side of this amplifier circuit 42 is coupled to the connection terminal 15.16.

Further, the magnetic head 11 is connected to other connection terminals 19.18 via signal circuits 17.18 provided inside the circuit device 12.
20.

The circuit device 12 is a unitized solid-state circuit component that is integrally connected to the magnetic head 11, and the connection terminal 1
5, 16, 19, 20, 43, and 44, it is configured to be able to be freely connected to and disconnected from other circuits described below.

The connection terminals 15 , 16 of the circuit arrangement 12 are connected to the magnetic erasing head 23 via a first recording/reproduction switch 21 , and one of the connection terminals 43 , 44 is connected to ground, and the other is connected to the third switch 45 . is coupled to the B voltage terminal 46 via.

The configuration of the circuit coupled to the connection terminals 19, 20 of the circuit device 12 and its related parts is the same as the configuration shown in FIG. 1, so the same parts are given the same reference numerals and the details thereof will be omitted.

Next, the operation will be explained.

By setting the first switch 21, the second switch 24, and the third switch 45 to the illustrated states, the magnetic recording and reproducing apparatus enters the "reproducing state."

The path of the reproduction signal during operation in this "reproduction state" is the same as the operation in FIG. 1, so its explanation will be omitted.

At this time, the oscillation circuit 41 is switched to the power supply 4 by the third switch 45.
6 and is in an inactive state.

Next, the first switch 21, the second switch 24 and the third switch
By switching the switch 45 to a state opposite to that shown in the figure, the magnetic recording/reproducing apparatus enters the "recording state".

That is, the recording signal applied from the signal input terminal 30 is amplified by the amplifier circuit 29 and supplied to the speaker 31. At the same time, the recording signal is applied to the second fixed terminal 26 of the first switch 24 and the fourth fixed terminal 26 of the first switch 24.
It is supplied to the recording head 11 via the fixed terminal 28 of.

The oscillation circuit 41 is connected to the B power supply terminal 46 via the third switch 45 and starts oscillating, and its oscillation output is supplied to the recording head 11 as a recording bias current.

The output of the oscillation circuit 41 is also branched and supplied to the input side of the high input impedance amplifier circuit 42.

The oscillation output supplied to the amplifier circuit 42 is amplified, led out to the connection terminals 15 and 16, and supplied to the magnetic erasing head 23 via the second switch 21.

In this embodiment, an oscillation circuit 12 and a high input impedance amplifier circuit are built in the circuit device 12.
2 and an oscillation circuit 12 for setting an adaptive bias current for the recording head 11 unit-coupled with the oscillation circuit 1;
Terminal 15 connects the stable output current regardless of the difference in the output of the two terminals.
．． 16, the high input impedance amplifier circuit 42
By this cooperative operation, the unit of the recording head 11 and the circuit device can be exchanged with other circuits, that is, the internal circuit of the main body of the magnetic recording/reproducing apparatus, through the connecting terminals 15, 16, 19, 20, 43, and 44.

The embodiment described with reference to FIGS. 1 and 2 can be put to practical use as shown in FIG. 3.

FIG. 3 shows a schematic configuration of a tape drive section and a magnetic head mounting section of a magnetic recording/reproducing apparatus embodying the present invention.
The magnetic tape 10 suspended on reels 51 and 52 is guided by guides 53 and 54, and is fed at a constant speed by the cooperation of a capstan 55 and a pinch roller 56.

The capstan 55 is mounted coaxially with the flywheel 57 and is driven to rotate stably by the source power of a remoter 58, and the pinch roller 56 is rotatably supported by a support member 59 and is constantly rotated by the action of a spring 60. The capstan 55 side is energized.

The support member 59 of the pinch roller 56 is rotatably supported on the movable member 61, for example, so that the support member 59 of the pinch roller 56 is supported on the movable member 61.
It is configured to be moved in conjunction with the movement of.

The movable member 61 is movably supported by elongated holes 62 and 63 and pins 64 and 65 that loosely fit therein.

A magnetic erasing head 23 and a magnetic recording/reproducing head 11 are supported on this movable member 61.

In particular, the magnetic recording/reproducing head 11 is integrally connected to a circuit device 12 (the part surrounded by a dotted line in FIGS. 1 and 2) made of a solid-state circuit component to form one unit.

Connection terminals 15 and 16 are provided on the rear surface of the solid-state circuit component 12.
, 19, 20 are provided protrudingly.

The unit parts of the magnetic head 11 and the circuit device 12 configured in this way include a support member 6 as shown in FIGS. 4 and 5.
6 can be detachably attached to it.

The support member 66 is mounted on the movable member 61 by a screw 67.
68 and into which the circuit device 12 is fitted with the connection pin; connection members 70, 71, 72, 73 formed by jacks provided at the bottom of the recess 69; Connecting terminals 74, 75, 76, 77 are provided which are electrically connected to 72, 73.

However, the connecting terminals 74, 75, 76, and 77 of the lever are terminals that are firmly connected to the electric circuit of the main body of the magnetic recording/reproducing apparatus, and the unit parts of the magnetic head 11 and the circuit device 12 are securely attached to the supporting member 66. It can also be easily removed if necessary.

By manufacturing the magnetic head 11 and the circuit device as unit parts according to the circuit configuration example shown in FIG. 1 or 2, various magnetic recording heads such as permalloy heads, sendust heads, ferrite heads, etc. can be manufactured in magnetic recording and reproducing devices. The user can freely replace the magnetic recording device according to the purpose of use, for example, depending on the number of pieces of music to be reproduced, and the functions of a single magnetic recording and reproducing device can be greatly increased.

[Brief explanation of drawings]

FIG. 1 is a circuit configuration diagram showing one embodiment of the magnetic recording/reproducing device according to the present invention, FIG. 2A is a circuit configuration diagram showing another embodiment of the same as above, and FIG. Figure, 4th
The figure is a perspective view of the main components in FIG. 3, and FIG. 5 is a plan view of the same. 10...Magnetic tape, 11...Magnetic recording and reproducing head, 12...Circuit device, 15
, 16, 19, 20, 43, 44... Connection terminal, 23... Magnetic erase head, 13...
Bias setting circuit, 14... Stable output circuit, 2
2, 41...Oscillation circuit, 42...High input impedance circuit.

Claims (1)

[Claims] 1. A magnetic erasing head/magnetic recording/reproducing head that is in contact with a magnetic tape fed by a drive device, and a magnetic recording head that is integrally coupled to at least the magnetic recording head and supplies an appropriate bias current to the magnetic recording head. and a signal input circuit for the magnetic recording head, and includes a connection terminal coupled to the bias supply circuit and the signal input circuit, and is connected to other circuits by the connection terminal,
1. A magnetic recording and reproducing device comprising a circuit device that can be freely separated. 2. The bias supply circuit of the circuit device according to claim 1 is coupled to a stable output circuit that obtains a stable output with respect to an input, and to the output side of this stable output circuit, and sets an appropriate bias current for the magnetic recording head. A magnetic recording and reproducing device consisting of a bias setting circuit. 3. The bias supply circuit of the circuit device according to claim 1 includes an oscillation circuit that supplies a suitable bias current to a magnetic recording head and a high input impedance that provides a stable output regardless of fluctuations in the output of this oscillation circuit. A magnetic recording and reproducing device consisting of a circuit.