JPH0754569B2 - Magnetic head - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head, and more particularly, to a magnetic head for a magnetic tape device, which has an improved handleability during the manufacturing process of the head and the assembly into the device. However, the present invention relates to a magnetic head structure suitable for supplying air to the magnetic tape and the head block.

[Conventional technology]

A magnetic head used in a conventional magnetic tape device has a structure in which two recording and reproducing blocks having a plurality of electromagnetic conversion elements are fixed to a holder by leaf springs and screws. As a known example of the magnetic head having such a structure, there is JP-A-58-6517.

Further, normally, the medium facing surface of the head block including the electromagnetic conversion element of the magnetic head and the recording surface of the recording medium are sufficiently polished. This is because when a recording medium such as a magnetic tape travels on the head block at the time of recording / reproducing information, the abrasion of both is prevented and the output electric signal is improved.
However, the two surfaces that come into contact with each other are sufficiently polished so that when the tape is completely stationary or almost stationary during the start and stop operations during normal data processing, the magnetic Since the recording surface of the tape adheres to the medium facing surface of the head block, it is not preferable in operation.

Recent high-speed, high-throughput data processing devices require that the magnetic tape be quickly started when a start command is issued to obtain the next data after the magnetic tape is once stopped. However, if the magnetic tape is attached to the head block, the start is blocked until an air bearing is created between them. In order to prevent this, when the magnetic tape is at rest or close to it, a pressurized fluid is supplied between the magnetic tape and the medium facing surface of the head block, and after sufficient air bearing is formed between them, The supply may be stopped and the recording / reproduction may be performed.
As a known example of such a magnetic head, JP-A-58-19942 is known.
No. 7 publication is cited.

[Problems to be solved by the invention]

In the former case of the above conventional example, transmission of a signal exchanged between the magnetic tape and the electromagnetic conversion element with the recording / reproducing circuit of the device is generally performed by connecting the FPC bonded to the pad section pulled out from the electromagnetic conversion element section to the connector section. It is performed with the connector on the device side, which is led from the recording / reproducing circuit by FPC, etc.

In the magnetic head having such a structure, the connector portion is not fixed to the holder, and is added to the connector guide portion in the magnetic head manufacturing or inspection process, or the process of assembling the magnetic head to the device. There is a problem that the pad part of the element and the bonding part of the FPC may be peeled off or broken due to the force, or the recording and reproducing head blocks that are positioned and fixed to the holder may move, resulting in poor touch with the magnetic tape. there were.

In the latter of the above-mentioned conventional examples, it is composed of a lifter tube attached to a magnetic head that supplies air between the magnetic tape and the head block, a solenoid valve that controls the flow of air, and a hose that connects both of them. The holding method was not taken into consideration. If the holding method was not good, the hose might come off due to the force of the fluid flowing therein, the vibration of the device, the handling of the hose, or the like. As a method to deal with this, it is possible to make the portion of the lifter pipe into which the hose is to be uneven or to bond the hose,
There has been a problem that the lifter tube becomes expensive and the number of steps for bonding increases, and in any case, the magnetic head becomes expensive.

An object of the present invention is to solve such a conventional problem, improve the handling property for the manufacturing process of the magnetic head or the assembly to the device at low cost, further prevent the hose from easily coming off, and always when necessary. It is to provide a magnetic head in which air can be supplied between the magnetic tape and the head block.

[Means for solving problems]

In order to solve the above problems, the magnetic head of the present invention is
(A) Head block (2,3) with an electromagnetic conversion element
And a holder (1) for holding the head block (2, 3)
And an FPC (flexible panel connector) that transmits signals to the electromagnetic conversion element and the recording or reproducing circuit of the magnetic storage device.
A magnetic head having (6) and a connector part (7) is characterized in that the connector part (7) is directly fixed to the holder (1). Further, (B) the FPC is also characterized in that it has a bend and is fixed to the holder (1) in order to prevent the head block (2, 3) from shaking. Further, (c) the FPC (6) is bent by forming a curl or a wavy portion between the head block (2, 3) and the portion fixed to the holder (1) of the FPC (6). It is also characterized by preventing the head block (2, 3) from shaking. Furthermore, (d) a head block (2, 3) that uses a flexible recording medium such as a magnetic tape and has an electromagnetic conversion element built-in.
And a holder (1) for holding the head block (2, 3)
And an FPC (6) and a connector section (7) for transmitting signals to the electromagnetic conversion element and the recording or reproducing circuit of the magnetic storage device.
And a magnetic head having an air tube for supplying a pressurized fluid for separating the recording medium from the medium facing surface of the head block (2, 3) in the non-electromagnetic conversion mode, the pressurized fluid is supplied to the air tube The hose (13) is also fixed to a part of the magnetic head.

[Action]

In the present invention, the connector portion is directly fixed to the holder, and the force applied to the connector portion by the head assembly or the like is transmitted only to the holder and is not transmitted to the head block portion. The FPC has a structure in which copper wires are bonded and fixed with a plastic film such as polyester, so the bending rigidity is low and it is difficult to transmit force in the bending direction.
All the force in the direction of pulling will be transmitted. Therefore,
If the connector part is fixed with screws with the FPC straightly extended, the torque when tightening is transmitted to the head block part as a force in the direction to pull the FPC. To avoid this problem, by utilizing the property that almost no force is transmitted in the direction in which the FPC bends (due to the small bending rigidity), when fixing the connector part to the holder, the position of the screw is set by the FPC. The structure is set so that the force in the pulling direction of the FPC is not transmitted to the head by setting it to a position that allows it to flex, curling the FPC, or providing a fold.

Further, in the present invention, since the hose is fixed near the magnetic head, it is not directly transmitted to the hose insertion port of the lifter pipe even when an external force is applied to the hose. Also, since the plugged-in state does not change, the hose will not come off.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a front view and a side view of a magnetic head showing an embodiment of the present invention, and FIG. 2 is an exploded structural view of the magnetic head of FIG. Here, FIG. 1 (a) shows a front view of the head, and FIG. 1 (b) shows a side view.

The recording / reproducing head blocks 2 and 3 are fixed to the holder 1 by the leaf spring 4 and the screw 5 with the reference plane and the height of the head blocks 2 and 3 positioned. The head blocks 2 and 3 have an electromagnetic conversion element (not shown) internally, and the FPC (copper wire bonded and fixed with a plastic film such as polyester) 6 and the terminal derived from the element are formed by the conventional technology,
For example, they are bonded and bonded by soldering or the like. A signal recorded / reproduced by running a magnetic tape (not shown) is transmitted to the pin 8 of the connector section 7. The connector portion 7 is fixed to the holder 1 with screws 10 via washers 9. The washer 9 should be inserted because the connector part 7 is a molded product, so the load due to screw tightening
This is to avoid concentrating on a part. A lifter tube 11 for supplying air is fixed to the holder 1 by screws 12 between the recording / reproducing head blocks 2 and 3. A hose 13 is inserted into the hose insertion port of the lifter pipe 11, in which air flows in the direction of arrow 14 and is supplied to the magnetic tape (not shown) and the medium facing surface side of the head blocks 2 and 3. To be done.

First, the connector portion 7 which is the first embodiment of the present magnetic head.
The structural part in which the holder 1 and the holder 1 are fixed will be described.

In the magnetic head having the above-described structure, the distance between the hole through which the screw 10 of the head block 2 or 3, the FPC 6 and the connector portion 7 shown in FIG. , If the distance from the reference surface a of the holder 1 to the screw hole is l (see FIG. 1), then l <is always taken into consideration in consideration of the dimensional tolerance of each component.
Design the size of the FPC 6 or the position of the screw hole of the holder 1 so that it becomes m. By doing so, after the head blocks 2 and 3 are positioned and fixed with respect to the reference surface a of the holder 1, the connector portion 7 is fixed to the holder 1 with the screw 10. At this time, the m dimension is larger than the l dimension. Because of the large size, each FPC6 is forced to bend into the shape shown in FIG. Therefore, due to the deflection, the force in the pulling direction of the FPC 6 generated by the torque transmitted to the connector portion 7 is absorbed when the screw 10 is tightened, and the joint between the FPC 6 and the head blocks 2 and 3 and the head blocks 2 and 3 are absorbed. Therefore, it is possible to obtain a magnetic head having good handling property.

In the first embodiment described above, the flat FPC is forcibly deflected so that the force applied to the connector portion 7 is applied to the head block.
It is designed so as not to be transmitted to the second and third parts, but as shown in Fig. 3, the FPC is initially curled (see Fig. 3 (a)), and a jagged fold is provided (Fig. It can be fully understood from the above description that the same effect can be obtained also by referring to FIG.

As described above, in the first embodiment, since the connector portion of the magnetic head is fixed and the FPC has a bend, the head manufacturing process, the inspection process, the head assembly process, and the like are performed. Even if force is applied to the connector part,
A force is not transmitted to the joint between the FPC and the head block, there is no problem of peeling or disconnection of the joint, or the problem that the head block moves with respect to the holder, and a magnetic head with good handleability can be obtained.

Next, the holding portion of the hose which is the second embodiment of the magnetic head will be described.

FIG. 4 is a view showing the shape of the washer 9 shown in FIG. 1 or 2. Here, (a) shows the shape of the washer 9, and (b) shows an enlarged view of the hole. The washer 9 is L-shaped as shown in FIG. 4, and has a hole having an opening so that the hose 13 can be fitted and fixed. The hose 13 is fitted into the hole of the washer 9 and fixed, and then guided to the solenoid valve on the apparatus side. The D dimension of the hole of the washer 9 may be slightly smaller than the outer diameter dimension of the hose 13, and the B dimension of the opening may be designed so that the hose 13 can be easily inserted and does not easily come off.

5 (a) and 5 (b) show the relationship between the hole diameter D and the opening B of the washer 9 and the hose withdrawing forces P ₁ and P ₂ . The vertical axis shows the pulling force, and the horizontal axis shows the D and B dimensions. As is clear from the figure, P ₁ and P ₂ increase as the D and B dimensions decrease. That is, it is understood that it is difficult to pull out. Therefore, the D and B dimensions may be appropriately determined according to the characteristics of the device in which the head is incorporated, such as the resonance characteristics, the ease of incorporating the head, or the length of the hose. , Has little effect on the fluid flowing through it unless the holes are completely collapsed). For example, when using a hose made of silicone rubber and having an outer diameter of 3.2 mm, it is sufficient to set the B dimension to 2.8 mm and the D dimension to about 1.6 mm. These can be easily molded by an ordinary manufacturing method such as press punching, and a particularly precise processing method is not required.

By doing so, even if an external force is applied to the hose 13, the force is not directly transmitted to the insertion port of the lifter pipe 11 of the hose 13, and the shape of the hose 13 between the washer 9 and the lifter pipe 11 is always constant. Since it is held in place and the insertion state does not change, it will not come off easily. This means that hose 13 is lifter tube
There is no need for a process such as adhering to the insertion port of 11, and since it is fixed to the washer 9 for dispersing the load of the screw 10 of the connector portion 7, new parts are not required and the magnetic head is very inexpensive. Can be obtained.

In the above-described second embodiment, the method of fixing the hose 13 to the washer 9 having the L shape has been described, but the washer can have various shapes. For example, the sixth
As shown in the figure, the tip of the plate-shaped washer may be bent to provide a portion for fixing the hose. Alternatively, even if the hose is fixed by devising the shape of the holder 1, the same effect as the second embodiment can be obtained. Here, the important point is that the hose inserted in the lifter tube is temporarily fixed on the magnetic head side and guided to the apparatus side.

As described above, in the second embodiment, the hose that supplies air between the magnetic tape and the medium facing surface of the head block is
Air can always be supplied when necessary without coming off from the lifter tube, and a magnetic head with excellent characteristics can be obtained.
Further, since it is not necessary to increase the number of parts, it contributes to the price reduction.

〔The invention's effect〕

As described above, according to the present invention, it is possible to inexpensively improve the handleability for the manufacturing process of the magnetic head, the assembly to the device, and the like, and further, the hose cannot be easily detached, and the air is always supplied with the magnetic tape when necessary. And the head block can be supplied.

[Brief description of drawings]

1 is a front and side view of a magnetic head showing an embodiment of the present invention, FIG. 2 is a view showing the structure of the magnetic head of the present invention, and FIG. 3 is a modification of the first embodiment of the present invention. FIG. 4 is a structural diagram of the magnetic head shown in FIG. 4, FIG. 4 is a diagram showing the shape of the washer in the second embodiment of the present invention, FIG. 5 is a diagram showing the relationship between the hole diameter, the width of the opening and the pulling force, and FIG. It is a figure which shows the modification in 2nd Example of this invention. 1: Holder, 2, 3: Head block, 4: Leaf spring, 5: Screw,
6: FPC, 7: Connector part, 8: Connector pin, 9: Washer, 10: Screw, 11: Lifter tube, 12: Screw, 13: Hose, 14: Air flow.

Front page continuation (72) Inventor Tokiyuki Seto 2880, Kozu, Odawara, Kanagawa Hitachi Ltd., Odawara Plant (72) Inventor Kazuhiro Soga 2880, Kozu, Odawara, Kanagawa Hitachi Computer Equipment Co., Ltd. (56 ) References Japanese Unexamined Patent Publication No. 52-12815 (JP, A) Actual development No. 60-159514 (JP, U) Japanese Patent Publication No. 42-25840 (JP, B1)

Claims (4)

[Claims] 1. A head block having an electromagnetic conversion element therein, a holder for holding the head block, an FPC (flexible panel connector) and a connector for transmitting a signal to the electromagnetic conversion element and a recording or reproducing circuit of a magnetic storage device. A magnetic head having a portion, wherein the connector portion is directly fixed to the holder. 2. The magnetic head according to claim 1, wherein the FPC is fixed to the holder with a bend to prevent the head block from shaking. 3. A curl or corrugation is formed in a portion of the FPC between the head block and a portion fixed to the holder, whereby the FPC is slackened to prevent the head block from shaking. The magnetic head according to claim 1, wherein the magnetic head is prevented. 4. A flexible recording medium such as a magnetic tape is used, and a head block containing an electromagnetic conversion element, a holder for holding the head block, a recording or reproducing circuit for the electromagnetic conversion element and a magnetic storage device. In a magnetic head having an FPC and a connector section for transmitting a signal to the magnetic head, and an air tube supplying a pressurized fluid for separating the recording medium from the medium facing surface of the head block in the non-electromagnetic conversion mode, A magnetic head characterized in that a hose for supplying a fluid to the air pipe is fixed to a part of the magnetic head.