JPS61104408A - Magnetic head device - Google Patents

Abstract

PURPOSE:To attain the satisfactory and instantaneous recording of various types of information by setting a head chip on a base to pick up the signal recorded to a magnetic recording medium and at the same time attaching a step-up transformer on the base. CONSTITUTION:In a record mode the record information given to a terminal 41 is supplied to a recording amplifier 42 and the gate signal given to a terminal 43 is set at an Ha level. Thus a recording transistor 44 is turned on. In this case, a reproducing TR45 is kept off since the gate signal is set at an L level by an inverter 46. Therefore the record information flows via a coil 21 of a record/reproduction head and the TR44 for execution of a recording action. While in a reproduction mode the gate signal is set at an L level. Thus the TR44 and TR45 are turned off and on respectively and the reproduction information induced to the coil 21 is stepped up by a step-up a transformer 31 for reproduction. Then the stepped-up information is delivered from a terminal 48 via a reproduction amplifier 47.

Description

Detailed Description of the Invention [Technical Field] The present invention relates to a magnetic head device for a magnetic recording/reproducing device used, for example, in an electronic camera for recording still images or a disk device for recording digital data, and particularly relates to a magnetic head structure. Regarding improvements.

[Prior art]

In conventional magnetic recording and reproducing devices, particularly magnetic recording and reproducing devices for small electronic cameras, a recording deck and a reproducing deck are usually provided separately. but,
If the recording deck and the reproducing deck are separated, it is impossible to satisfy the desire to immediately reproduce recorded images, etc., and to re-record immediately if there is a problem. The same holds true for digital data recording. As a way to improve this point to some extent, a magnetic recording/reproducing device that uses a recording/reproducing head that integrates a recording head and a reproducing head and incorporates a recording/reproducing circuit has been developed and put into practical use. . According to this magnetic recording/reproducing device, digital data can be immediately reproduced and re-recorded after recording, but image information cannot be re-recorded because an erasing head is not incorporated. The main reason why the erase head is not built into the above devices is that in the case of digital data recording devices, so-called override is possible, so there is no need for an erase head, and in the case of small electronic cameras, all parts are small. Due to the demand for miniaturization and compactness, and the space for installing components is extremely limited, it is difficult to incorporate an erasing head that requires a relatively large installation space due to space considerations. In addition, in a device that uses a magnetic disk with a diameter of about 2 inches as a recording medium, when an erasing head is installed together with a recording/reproducing head, it is extremely difficult to set the head position so that a good head touch can be obtained for both heads. . Particularly when performing high-density recording where the recording wavelength is on the order of 0.5 μm or less, it is necessary to minimize the spacing loss caused by the quality of the head touch of each head. High-density recording is difficult because it is difficult to obtain a good flat touch.Furthermore, in the case of image recording, there is a frame recording mode that uses two tracks, but in this case, in addition to the two playback heads, there is also an eraser. Since two heads are required,
A total of four heads must be installed within a limited space on one deck. Therefore, in this case, the above-mentioned difficulties become even more pronounced. Since there are various difficulties in incorporating an erasing head as described above, the current situation is that image information is erased all at once using a separate erasing device. Therefore, the above-mentioned desire to re-record immediately after reproduction has not yet been satisfied.

On the other hand, as a countermeasure when the head output is insufficient, or when using an FET in the first stage of a playback amplifier,
Generally, a step-up transformer is used for playback, but the transformer is usually installed outside the base that supports the head depth, and is connected to the head chip using an appropriate signal line. ing. However, the above-mentioned devices tend to pick up noise in the signal line portion, and the resistance of the signal line deteriorates frequency characteristics.

〔the purpose〕

The present invention was made based on these circumstances,
The purpose of this is to be able to obtain a large playback output with good S/N and frequency characteristics, even if the spacing loss is not good enough and the spacing loss is relatively large, and image information etc. It is an object of the present invention to provide a small and easy-to-manufacture magnetic head device that is capable of recording and reproducing various kinds of information satisfactorily and also enables immediate re-recording.

〔overview〕

In order to achieve the above object, the present invention is characterized by the following configuration. That is, in the magnetic head device of the present invention, a head chip for picking up signals recorded on a magnetic recording medium is provided on a base, and a step-up transformer is provided on the base to boost the level of the signal picked up by the head chip. It is characterized by having a .

The head chip is preferably a composite magnetic head formed by bonding a plurality of thin film heads such that each head gap is arranged at a predetermined interval in the track width direction. Further, it is desirable that the step-up transformer is equipped with a shield case.

〔Example〕

First, the basic configuration other than the main parts of the present invention will be explained with reference to FIGS. 1 to 8. FIGS. 1 and 2 are schematic diagrams of the cause and head structure in one embodiment of the present invention. 1st
1 in the figure is a rotating magnetic disk, and a motor (not shown)
3 in the counterclockwise direction as shown by the arrow, centering on the 0 point.
Rotates at a rotation speed of 60 ORPM (for NTSC). A composite magnetic head (
(hereinafter abbreviated as composite head) 2 records track T1.
．． T2... are formed concentrically. Disc 1 above
At one point on the outer circumference of the hub 3 located at the center of
A PG yoke 4 is provided as an index for detecting the rotational position of the disk 1. On the other hand, at one point on the rotation locus of the PG yoke 4 on the device main body side, a PG as a pulse detection means is installed.
Coil 5 is straddled. This PG coil 5 is arranged on the non-recording surface side of the magnetic disk 1, that is, on the opposite side from the composite head 2, and when the magnetic disk 1 rotates, the PG coil 5
A pulse signal induced by interlinking with the magnetic flux generated by the G yoke 4 is extracted.

By the way, when recording still image information on the magnetic disk 1, when performing field recording, still image information of separate fields is recorded on tracks T1 and T2, and when performing frame recording, still image information of separate fields is recorded on tracks T1 and T2. Two consecutive fields of still image information are recorded. In either case, the start and end points of recording are when the PG yoke 4 reaches the position shown in FIG. , when the PG yoke 4 arrives on the O-Y line. That is, at this time, the composite head 2 is switched by the PG pulse obtained in the PG coil 5. In the case of image recording, considering NTSC signals, 262H (horizontal line) signals are recorded on one track, but the switching point at this time is, for example, 7 days before the leading edge VS1 of the vertical synchronization signal S. This is the point in time. Therefore, the leading edge vS1 of the vertical synchronization signal VS is θ(36
It is recorded at an angle O-0' shifted by 0°x (7/262)). As a result, the noise component generated at the switching point is located near the edge of the screen and can be substantially ignored.

FIG. 2 is a plan view showing the external structure of the composite head 2 shown in FIG. This composite head 2 has tracks TI and T2.
On the other hand, various information such as image information or digital data can be continuously recorded or reproduced without moving the head, and the recorded information can be erased at any time. That is, this composite head 2 has a first recording/reproducing gap R/W-1 that matches the first track, for example, T1.
and erasing gaps E1 are provided spaced apart in the track longitudinal direction, and a second recording/reproducing gap R/W-2 and an erasing gap E2 are provided that are compatible with a second track, for example, T2.
Similarly, they are spaced apart in the longitudinal direction of the track. The composite head 2 is provided with a two-track recording/reproducing head 2A on the left side of the Y-Y' line and a two-track erasing head 2B on the right side of the Y-Y' line, respectively. These can be integrally joined by sandwiching the cross 1 to the magnetic shielding member 2C for preventing warping, and the head can be mounted by fixing it to the base 2D. P in the diagram
represents the track pitch, Wa represents the recording/reproducing track width, and wb represents the erasing track width. Then, by attaching this composite head 2 to the main body of the device so that the joint part, which is the head center, is on the O-Y line in FIG. Erasure gap E1. E2
The four gaps can be made to touch the recording surface of the magnetic disk 1 to the same extent with the head.

Thus, a single head is sufficient, and when incorporated into an electronic camera, etc., it can be handled in the same space as a conventional head, and recording, playback, and erasing can be performed accurately at any time.

In the head configuration examples shown in FIGS. 1 and 2 above, the recording/reproducing gaps R/W-1, R/W- of the composite head 2 are
2 is slightly shifted to the side from above the Y-Y' cotton line. Therefore, the switching point is shifted by the shift width D1, and when the composite head 2 moves in the disk radial direction, the inclination angle of the gap with respect to the track changes, resulting in a change in the azimuth angle. To avoid this, the recording/reproducing gap R/W-1, R/W-2
It is difficult to manufacture because it needs to be slightly inclined with respect to the Y-Y' line. Furthermore, since a magnetic shield 2C for preventing crosstalk is interposed on the head joint surface, the recording/reproducing gap R/W-1°R/W-2 and the erasing head E1.
The distance D2 from E2 also increases. Therefore, it is relatively difficult to obtain the best helad touch.

FIGS. 3 and 4 are a schematic diagram and a head structure diagram showing another example of the head configuration in which the problems of the above-described example of the head configuration are corrected. The overall configuration is the same as the examples shown in FIGS. 1 and 2, but in this head configuration example, the recording/reproducing gaps R/W-1 and R/W-2 of the composite head 6 are provided at the head center. , erasure gap E1. E2 is located upstream of the upper recording gap R/W-1 and R/W-2 (approximately 400 μm, which corresponds to a time difference of approximately 1H of the video signal)
It is located at a different position. The head touch is set to be optimal on the line between the recording/reproducing gaps R/W-1 and R/W-2.

Therefore, according to this example of the head configuration, the head touch is better than that of the above-mentioned example of the head configuration, and the spacing loss during recording and reproduction is reduced and the performance is improved. , - direction, erasure gap E1. E2 is recording/reproducing gap R/W-1, R/W
The head touch is worse than in -2, but since the erase gap width is larger than the recording/reproducing gap width, a slight performance deterioration can be tolerated.

In addition, as will be explained later, the recording operation is performed once per rotation of the disk.
Although the erasing operation is limited to one time, the erasing operation may be performed continuously while the disk 1 rotates a plurality of times, so that the erasing gap E1. It can fully compensate for E2's poor Herad touch.

Especially in this head configuration example, the recording/reproducing gap R/W
Since R/W-1, R/W-2 is on the Y-Y' line, even when the composite head 6 moves in the radial direction of the disk 1, the gap R/W-1, R/W-2 with respect to the track is
There is no change in the inclination angle (azimuth angle) of W-2. Therefore, there is an advantage that no azimuth loss occurs. Note that the erasure gap E1. E2 has almost no effect on the azimuth angle for the reasons mentioned above, so the recording/reproducing gap R/W-1,
It can be provided almost parallel to R/W-2. Therefore, manufacturing is easier than in the above-mentioned head configuration example.

In order to improve head touch, etc., the distance X between the recording/reproducing heads R/W-1, R/W-2 and the erasing heads E1, E2 should be as small as possible, and the magnetic shield 6C on the joint surface should also be All you have to do is make it as thin as possible, but if you do this, the recording/reproducing gaps R/W-1, R/W-2 and 8! j left gap E1. Crosstalk between E2 becomes a problem. However, as will be described later, the problem of a-stoke can be solved by appropriately setting the timing of recording and erasing.

Incidentally, it is generally considered that a thin film head is desirable as a multichannel head with less crosstalk. As a thin film head for recording/reproduction, for example,
Giken Report, VR63-8, P55-60, (59,8,
21>r Thin Film Head for High Density Magnetic Recording Sheets" is known. However, even if a recording/reproducing head can be made into a III-type recording/reproducing head, it is extremely difficult to make the erasing head, which is to be combined with this recording/reproducing head, thin.

The reason is that it is recorded on a metal disk with a coercive force @ C-1400 oersted (7M)! In order to erase the luminance signal of z by -40d13, a magnetizing force of 2 amperes or more is required, but it is difficult to increase the number of turns in a thin-film head coil, and it is also difficult to increase the cross-sectional area of the coil, so This is because it is difficult to obtain a large ampere turn. In addition, in order to manufacture a core that allows large magnetic flux to pass through, it is necessary to increase the cross-sectional area of the core, but since the core of thin-film heads is formed by sputtering, it takes a long time to manufacture a core with a large cross-sectional area. However, there is a cost problem.

FIGS. 5 and 6 are diagrams showing a composite head constructed in consideration of such circumstances. As shown in FIG. 5, the composite head 6 is mounted and fixed to the end of the base 7, and the coil of the head is connected to the printed wiring 8 on the mounting base 7 by a lead wire 9. In addition, in Figure 5,
10 is a mounting hole. Generally, there is not enough space around the head on the 81 bridge, so a small base 7 of about 5 x 10 mm2 is used for mounting.

FIG. 6 is a longitudinal sectional view of the composite head 6. As shown in FIG.

The thin film recording/reproducing head section 6A is formed by sputtering a magnetic material having a high tri-total magnetic flux density, such as sendust, on a ferrite substrate 6-1 whose end surface has been polished to form a lower core 6-2. After insulating with 8102 or the like on this lower core 6-2, 5 to 10 turns of a thin film coil 6-3 made of copper or the like is formed by processing techniques such as sputtering or vapor deposition and etching, and St 0
A recording/reproducing gap portion 6-4 is formed by sputtering 2 with a 0.1 μm to 0.2 μm support, and an upper core 6-5 is formed using the same material as the lower core on top of it by sputtering or the like. , forming a protection M6-6 thereon, and bonding glass 6-6 thereon.
The protective plates 6-8 are fused together using the protective plates 6-8.

In addition, the bulk erase head section 6B has a magnetic core 6-9 made of sendust or the like and a magnetic core 6-11 made of the same material made by winding a coil 6-10 with 10 to 20 turns, and the erase gap portion 6-12.

The composite head 6 is constructed by integrating the thin film recording/reproducing head section 6A and the bulk erasing head section 6B. Note that it is desirable to sandwich a magnetic shield plate between both head portions 6A and 6B.

According to the composite head 6 having such a configuration, the protective plate 6-8 is connected from the recording/reproducing gap 6-4 in the thin film recording/reproducing head section 6A.
Since the thickness up to this side can be made less than 30μ, the distance between both gaps can be significantly reduced. Therefore, it is possible to make good contact between the recording/reproducing gap section 6-4 and the erasing gap section 6-12 at the same time. Further, even when the recording/reproducing head section 6A is formed in two channels in the width direction of the track, crosstalk during reproduction can be suppressed to about -408 because the recording/reproducing head section 6A is formed of HIM. Therefore, it is suitable for multi-head configuration and is easy to manufacture. Further, the erasing head section 6B is
Since it is a normal bulkhead, it can easily carry a large current and generate a large magnetic flux. Therefore 7 MHz
It is possible to erase a luminance signal of about 40 dB or less.

FIG. 7 is a block diagram showing the configuration of a control system that uses the composite head 6 to perform seven recording and erasing operations.

One feature of this flilJ ill system is that the PG pulse used for switching the recording head is also used for switching the erasing head. A terminal 11 shown at the left end in the figure is supplied with a video signal from an imaging device such as a solid-state imaging device or an external TV signal generator. This video signal is transmitted to the vertical synchronization separation circuit 12 and F
The signal is supplied to the M modulation circuit 13. From the video signal supplied to the vertical synchronization separation circuit 12, only the vertical synchronization signal S is separated and extracted, and this is supplied to the motor servo circuit 14. The motor servo circuit 14 receives the FG pulse, which is a rotational speed signal, from the disk drive motor 15, and performs speed servo on the motor 15 to keep it rotating at a constant speed of 3600 RPM. A magnetic disk 1 is loaded on the shaft of the motor 15, and a PG yoke provided near the center of the disk 1 is detected by a PG coil 5, and 60 PG pulses are sent out per second. There is. After this pulse is waveform-shaped by a PG pulse detector 16, it is supplied to a motor servo circuit 14 and also to a recording/erasing control circuit 17, which will be described later.

The motor servo circuit 14 receives both the vertical synchronization signal and the PG pulse, and performs motor phase servo so that the PG pulse and the leading edge VS1 of the vertical synchronization signal maintain a time difference of 7H (63.5 μs×7).

On the other hand, the video signal supplied to the FM modulation circuit 13 is FM
After being modulated, the current is amplified by the recording amplifier 18, and the recording/reproducing gap R/W of the head 6 is output via the switch 19.20.
-1 and R/W-2 are supplied to excitation coils 21 and 22 corresponding to R/W-2.

On the other hand, the erase signal output from the erase signal generator 23 consisting of an oscillator is current-amplified by the erase amplifier 24 to become an erase current, which is then passed through the switches 25 and 26 to the erase gap E1. It is supplied to excitation coils 27 and 28 corresponding to E2.

Switches 19.20 and 25.26 are connected to the control circuit 1.
ON, OFF and switching are controlled by 7. When the control circuit 17 receives an operation command from an operation command switch 29 (release switch in the case of an electronic camera), it operates in synchronization with the PG pulse, and the switches 19 and 20 operate in synchronization with the PG pulse.
and 25°26 control.

FIG. 8 is a timing chart showing the operation of the control system shown in FIG. 7 above. As shown in FIG. 8, the vertical synchronization signal VS
is input every 1/60 seconds, and when the operation command switch 29 is turned ON at time t1 in a state where the PG pulse is input seven days ahead of the leading edge of the PG pulse, the P
At time t2 when the G pulse is input, a control signal is output from the control circuit 17, and the switch 25 is turned on by this output.
The switch 26 is controlled to be switched to the seventh illustrated state, that is, to the side a. Therefore, erasing using the erasing gap E1 becomes possible. In this example, erasing is performed using the erasing gap E1 during the period when the disk 1 rotates twice. and time t3
When it reaches , only the switch 26 is switched to the b side. Therefore, erasing using the erasing gap E2 becomes possible as well. At time t4, the operation command switch 29 is turned off, so that the erasing operation is completed in only one cycle (4 rotations of the disk) and the recording operation is started. That is, time t
When the PG pulse is input at step 5, the erase operation is completed and at the same time the switch 19 is activated by the output from the control circuit 17.
is turned ON, and the switch 20 is controlled to be switched to the a side.

Therefore, recording using the recording/reproducing gap R/W-1 is possible during one rotation of the disk 1. Next PG
At time t6 when the pulse is input, the changeover switch 2o is switched to the b side. Therefore, recording using the recording/reproducing gap R/W-2 is also possible.

In this way, erasing and recording on two tracks is possible in six fields (1/10 seconds). And El and R/
Since W-1, E2 and R/W-2 are in the active state separated in time, crosstalk is less likely to occur. In addition to the recording/reproducing gaps R/W-1 and R/W-2, the erasing gap E1. Since E2 is also controlled to switch in synchronization with the PG pulse, so-called idle time does not occur at all.

Furthermore, since erasing is carried out during at least one revolution of the disk 1, no portion remains unerased. Note that by shifting the timing at which the operation command switch 29 is turned OFF, the erasing cycle can be performed over a period of two revolutions or more.

Next, the main parts of the present invention will be explained with reference to FIGS. 9(a), (b), (C), +5, and FIG. 10. Figure 9(a)(b)
) and (c) are diagrams showing the head structure of the magnetic head device of the present invention. As shown in the figure, the composite head 6 is fixed to one end. On the base 7, two playback step-up transformers 31 and 32 are installed via an insulating layer (not shown) to enable two-channel playback. It is installed. Note that (a)
Although not shown in the figure, the transformers 31 and 32 are covered with magnetic shielding cases 33 and 34, as shown in FIG.

According to the composite head device of this embodiment configured as described above, the distance from the head to the transformer 3'1.32 becomes the shortest, making it difficult to pick up noise and improving the S/N ratio. Furthermore, since the wiring resistance is minimized, frequency characteristics are also improved. Note that it is desirable that the magnetic permeability μ of the transformers 31 and 32 is high at high frequencies. In this example 10MHz
500 μm is used. If μ is low, the number of turns on the secondary side of the transformer 31, 32 must be increased,
Frequency characteristics deteriorate.

FIG. 10 is a circuit diagram when the step-up transformers 31 and 32 are installed. 1st channel 40 and 2nd channel
Since the configuration is exactly the same as that of the channel 50, only the first channel 40 will be explained, and the second channel 50 will be explained.
The corresponding reference numbers in the 50s will be given and the explanation will be omitted.

First, during recording, the recording information applied to the terminal 41 is supplied to the recording amplifier 42, and the gate signal applied to the terminal 43 becomes H level, so that the recording transistor 44 is turned on. At this time, the reproduction transistor 45 is turned off because the gate signal is set to the positive level by the inverter 46. Therefore, the recorded information is stored in the coil 21 of the recording/reproducing head. The signal flows through transistor 44 and recording is performed. At this time, the primary coil of the reproducing step-up transformer 31 does not affect the recording operation.

On the other hand, during reproduction, the gate signal is at L level. Therefore, the recording transistor 44 is turned off.
The reproduction transistor 45 is turned on. Therefore, the reproduction information induced in the coil 21 of the recording/reproducing head is stepped up by the reproduction step-up transformer 31 and then outputted from the terminal 4 via the reproduction amplifier 47. At this time, since the output terminal of the recording amplifier 42 is short-circuited by the transistor 45, there is no possibility that the recording circuit will affect the above-mentioned reproduction operation. In FIG. 10, 49 is an erase signal supply terminal. If the entire circuit shown in FIG. 10 is made into a hybrid IC and mounted on the base 7, the number of wiring lines will be reduced and the S/N2 frequency characteristic will be further improved.

The present invention is not limited to the one embodiment described above, but can be implemented with various modifications as follows.

For example, as shown in FIGS. 11(a), (b), and (c), at least the recording/reproducing gaps R/W-1, R/
The disk contact surface 61 including W-2 and erase gaps E1 and E2 has a flat surface in the track longitudinal direction indicated by arrow M, and a predetermined curvature, for example, 50 to 1·OOR, in the track width direction indicated by arrow N. It may also be formed to have a curved surface. In other words, the entire head may have a kamabok shape. It has been experimentally confirmed that the composite head 60 having such a shape has better flat contact with the disk 1 than those having other shapes.

Alternatively, the composite head may be configured as shown in FIG. The twelfth factor is an example of a two-track composite head dedicated to data recording. This composite head is of a so-called tunnel erase head type, and the recording/reproducing gaps R/W-1 and R/W-2 are used as override rad gaps. That is, the recording/playback gap R/
W-1゜R/W-2Gt Track width W1 (60μm)
This recording/reproducing gap R/W-
1. Perform override recording by R/W-2.

and two erase gaps E1a per track.

Elb, E2a, and E2b are used to erase recording signals that protrude from the track width W1. Thus, during playback, the head width is wider than the track width W1, making playback tracking easier, but the head has two erase gaps E1b, E1a within the guard band width W2 (40 μm) as shown in the figure. There is a problem in that it is difficult to manufacture the head because it has to be formed.

In addition, as shown in FIG. 13, an ON/OFF switch 7 is provided instead of a part of FIG.
1, and an erase gap E1. E2 may be caused to perform the erase operation at the same time.

FIG. 14 is a diagram showing the timing of FIG. 13. As shown in FIG. 14, the erasable timings of El and E2 are at the same time. Therefore, according to this example, the erasing/recording cycle can be made shorter than that of the one shown in FIG. 7, and erasing and recording can be performed at 15 revolutions per second.

Further, as shown in FIGS. 15 and 16, the recording/playback side changeover switch 20 and the erasing side changeover switch 2 shown in FIG.
6 may be controlled to switch at the same time. However, the first
In the case of FIG. 6, the switching directions of 20 and 26 are reversed by an inverter 72.

FIG. 17 is a diagram showing the operation timing of FIGS. 15 and 16. As shown in FIG. 17, recording by R/W-1 and erasing by El or E2 (broken line) can be active during the same period. Further, recording by R/W-2 and erasing by E2 or El (broken line) can be activated during the same period. When R/W-1 and El and R/W-2 and E2 become active at the same time,
The erasing and recording periods completely overlap on the same track, but as described above, the erasing gap E1. E2 and the recording/reproducing gaps R/W-1 and R/W-2 are provided apart from each other by a predetermined distance X, and there is no problem because the erasing operation is performed first. In other words, recording is performed immediately after erasing. Thus, in frame recording, 3
0 times/second.

In field recording, it is possible to erase and record 60 times/second, which is even faster than in the case of Figures 13 and 14.
Recording cycle becomes shorter. In this example, crosstalk between the erasing head section and the recording/reproducing head section tends to occur to some extent, so it is desirable to use the circuit for image recording or digital data recording using a modulation method that is resistant to noise. In data recording, it is a great advantage that data recording can be performed on two tracks without head access dead time. In the case shown in FIG. 16, that is, the erase gap E1. If the active period of E2 is set to the timing shown by the broken line in FIG. 17, recording and erasing are performed at the same timing on adjacent tracks. Therefore, compared to the case of FIG. 15, the occurrence of crosstalk is relatively small.

It goes without saying that various modifications can be made in addition to the above without departing from the gist of the present invention.

〔Effect of the invention〕

The magnetic head device of the present invention includes a head chip on a base that picks up a signal recorded on a magnetic recording medium, and a step-up transformer on the base to boost the level of the signal picked up by the head chip. It is characterized by the fact that it is installed.

The head chip is preferably a composite magnetic head formed by bonding a plurality of thin film heads such that each head gap is arranged at a predetermined interval in the track width direction. Further, it is desirable that the step-up transformer is equipped with a shield case.

Therefore, according to the present invention, even if the spacing loss is not sufficiently good and the spacing loss is relatively large, it is possible to obtain a large reproduction output with good S/N and frequency characteristics. It is possible to provide a small and easy-to-manufacture magnetic head device that can satisfactorily record and reproduce various information such as image information, and also enables immediate re-recording.

[Brief explanation of the drawing]

1 to 8 are diagrams showing the configuration of basic parts other than the main parts in an embodiment of the present invention, and FIGS. 3 and 4 are schematic diagrams and head structure diagrams showing another example of the head configuration corresponding to FIGS. 1 and 2, and FIGS. 5 and 6 are a plan view of the composite head device and a diagram of the composite head. 7 is a block diagram showing the configuration of a control system that causes the composite head to perform recording and erasing operations, and FIG.
The figure shows the operation timing of each part of the control system shown in FIG. 7, and FIGS. (a) (b) (c)
is a diagram showing the configuration of the composite head device, FIG. 10 is a circuit diagram when the composite head device shown in FIG. 9 is used, and FIGS. Figure 12 is a diagram showing a modification example, and Figure 12 is a diagram showing an application example of the composite head.
Figure 3 is a partial configuration diagram showing an example in which a part of Figure 7 is modified;
Fig. 14 is a diagram showing the operation timing of Fig. 13, Fig. 15 is a diagram showing the operation timing of Fig. 13;
16 and 16 are partial configuration diagrams showing an example in which a part of FIG. 7 is modified, and the 17th factor is shown in FIG. 15 and 16.
It is a figure which shows the operation timing of a figure. 1... Rotating magnetic disk, 2... Composite head, 4...
...PG yoke (rotational position detection index), 5...PG
Coil (pulse detection means), 6... Composite head, 6A
... Thin film recording/reproducing head section, 6B... Bulk erase head section, 7... Head mounting on base, 8... Blount wiring, 21.22 and 27.28... Excitation coil,
29...Release switch (operation command switch), 3
1゜32...Step-up transformer for reproduction, 33.
34...Magnetic shield case, 40.50...1st
．． Second channel, T1. T2...Truck, R/W
-1, R/W-2...Recording/playback gap, El, E2...
-Elimination gap. Applicant's agent Patent attorney Atsushi Gaiben 1 Figure 3 Figure 4■

Claims (3)

[Claims] (1) A head chip that picks up signals recorded on a magnetic recording medium, a base that supports this head chip, and a step-up transformer installed on the base to boost the level of the signal picked up by the head chip. A magnetic head device comprising: (2) The magnetic head according to claim (1), wherein the head chip is a composite magnetic head formed by bonding a plurality of thin film heads such that each head gap is lined up at a predetermined interval in the track width direction. Device. (3) The magnetic head device according to claim (1), wherein the step-up transformer includes a shield case.