JPH06162407A - Magnetic head device - Google Patents

Abstract

PURPOSE:To obtain a flexible printed circuit(FPC) usable for both systems of an advance erase system and a tunnel erase system in common. CONSTITUTION:A FPC terminal part connected to a head coil terminal is wired symmetrically to a center line, and two erase coil terminals 4a and 4b which are inserted in a FPC terminal part 7b at an erase coil side electrically connected to a read write coil center terminal 3c on the FPC and a FPC terminal part 7b in adjacent to the terminal part 7b are short-circuited with a lead line 4d. Consequently, the FPC terminal part 7b at the erase coil side electrically connected to the read write coil center terminal 3c is electrically connected to a driving circuit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording device for recording and reproducing data, and more particularly to a magnetic head used for FDD.

[0002]

2. Description of the Related Art FIGS.
It is a figure which shows the conventional magnetic head device shown by 9519 gazette. In the figure, (1) is a preceding erase head magnetic core, (9) is a tunnel erase head magnetic core, and (5) is a backing that is closely fixed to the magnetic cores (1) and (9) to form a magnetic circuit. Bar, (12) is a read / write gap for recording and reproducing data, (13) is an erase gap for erasing data, (3) and (10) are the magnetic cores (1) and (9), respectively. A read / write coil that is mounted for recording and playback, (3a) (3b) (10a) (10b) is a read / write coil terminal, (3c) (10c) is a coil center terminal, and (6) is a head support. Gimbal for (8) is an electrical connection means between the head coil and the FPC terminal, (15)
Is a conventional erase coil for erasing data, (15
(a) and (15b) are erase coil terminals, (17) and (18) are FPCs for connecting the head coil and the electric circuit for driving the head, of which the FPC (17) is for the conventional preceding erase head. FPC, FPC (18) is a conventional FPC for tunnel erase head, (17a) is a coil connecting portion for connecting the coil center terminal (3c) and one of the erase coil terminals (15a) (15b), ( 18a) is the coil center terminal
(10c) and the coil connecting part for connecting one of the erase coil terminals (15a) and (15b), (17b) and (18b) are the center terminals (3c) (10c) and the erase coil terminal of the read / write coil This is a pattern for connecting one terminal of (15a) and (15b) to the center terminal of the circuit.

Next, the operation will be described. 16 and 1
7, the difference between the preceding erase head and the tunnel erase head will be described. In the FDD, a non-recorded portion is provided between each data track in order to maintain compatibility of the recording medium. The erase head has the purpose of forming this portion, and there are two types of this erase method, a preceding erase and a tunnel erase. FIG. 16 shows an example of the preceding erase method. First, when recording data, erase coil
An erasing current flows in (15), the magnetic flux passing through the magnetic core (1) leaks from the erase gap (13), and old recorded data is widely erased to form the non-recorded portion. Next, a recording current flows through the read / write coil (3), the magnetic flux passing through the magnetic core (1) leaks from the read / write gap (12), and new data is recorded. During data reproduction, the magnetic flux detected by the read / write gap (12) passes through the magnetic core (1) and intersects with the read / write coil (3), generating an output voltage between the terminals (3a) and (3b). . Erase coil terminal (15a) (15b)
One of them is always connected to the coil center terminal (3c) of the read / write coil (3) by the coil connecting portion (17a), and as shown in FIG. 12, the head drive is performed by the center terminal / circuit connection pattern (17b). Connected to the circuit.

On the other hand, in the case of the tunnel erase system shown in FIG. 17, first, at the time of data recording, the read / write coil (1
A recording current flows in (0), the magnetic flux passing through the magnetic core (9) leaks from the read / write gap (12), and new data is recorded on the old recording data. Next, erase coil (1
An erasing current flows in 5), and the magnetic flux passing through the magnetic core 9 leaks from the erase gap 13 to slightly erase both sides of new recording data to form the above non-recorded portion.
During data reproduction, the magnetic flux detected by the read / write gap (12) passes through the magnetic core (9) and the read / write coil.
It intersects with (10) and generates an output voltage between terminals (10a) and (10b). One of the erase coil terminals (15a) and (15b) is always connected to the coil center terminal (10c) of the read / write coil (10) by the coil connecting portion (18a), and further, FIG.
As shown in, the center terminal / circuit connection pattern (18b) is connected to the head drive circuit. As described above, in the preceding erase head and the tunnel erase head, the positions of the read / write coil and the erase coil are always reversed.

FIGS. 12 and 13 show a state in which the FPC terminal portion and the coil terminal are connected by the electrical connecting means (8). The FPC (17) and (18) wiring had the pattern shown in the figure. (17b) and (18b) are the center terminal / circuit connection patterns, which are necessary for the operation of both the read / write and erase coils.The presence of this part makes the leading erase head and tunnel erase head completely opposite. FPC land pattern was required. FIG. 14 and FIG. 15 show the connection state of the coil and the FPC in the conventional preceding erase head and tunnel erase head, respectively. The conventional erase coil (15) uses only two terminals and is connected as shown in the figure.

[0006]

Since the FPC of the conventional magnetic head device is constructed as described above, the FPC connection is different between the tunnel erasing method and the preceding erasing method in which the erase coils are arranged differently. FPC is required. Therefore, there is a problem that the cost of FPC increases.

The present invention has been made to solve the above problems, and an object thereof is to obtain an FPC that can be commonly used for both the prior erase and tunnel erase methods.

[0008]

In order to achieve the above object, a magnetic head device according to the present invention provides a preceding erase in an FPC for electrically connecting a head coil of a magnetic head used in an FDD and a circuit. FPC for selectively connecting either head or tunnel erase head
The main structure is that the wiring of the terminal portion is symmetrical with respect to the center line, and the FPC terminal portion on the erase coil side that is electrically connected to the read / write coil center terminal is electrically connected to the drive circuit by the following means. That is, claim 1
The means of the invention of the present invention uses an F
The FPC terminal portion on the erase coil side that is conducted on the PC and the two erase coil terminals that are inserted into the adjacent FPC terminal portion are short-circuited with a lead wire. According to a second aspect of the invention, the F on the erase coil side that is electrically connected to the read / write coil center terminal on the FPC.
That is, the PC terminal portion and the FPC terminal portion adjacent to the PC terminal portion are electrically connected by the terminal short-circuit plate. According to a third aspect of the present invention, the read / write coil center terminal is provided with a terminal short-circuit wiring portion on the erase coil side FPC terminal portion which is conducted on the FPC and the FPC terminal portion adjacent to the erase coil side. It is to electrically connect the short wiring part directly.

[0009]

The wiring of the FPC terminal portion of the magnetic head according to the present invention is connected symmetrically with respect to the center line.
By the means of the invention of each claim, the FPC terminal portion on the side of the erase coil, which is conducted to the center terminal of the read / write coil, is conducted to the drive circuit, and therefore, it can be used for both the preceding erase head and the tunnel erase head.

[0010]

【Example】

Example 1. The first embodiment of the present invention will be described below with reference to FIGS. 1 to 3 are perspective views showing the structure of the preceding erase head in the first embodiment of the present invention, FIG. 4 is a perspective view showing the connection of the FPC terminal portion in the first embodiment of the present invention, and FIG. 5 is the view of the present invention. 6 is a perspective view showing the structure of the tunnel erase head in Embodiment 1, FIG. 6 is a perspective view showing the structure of the preceding erase head of the present invention, FIG. 7 is a perspective view showing the structure of the tunnel erase head of the present invention, and FIG. FIG. 9 is a perspective view showing the connection between the coil of the preceding erase head and the FPC in the first embodiment of the invention, and FIG. 9 is the coil of the tunnel erase head and the FPC in the first embodiment of the invention.
3 is a perspective view showing the connection of FIG. In the figure, (1) is a leading erase head magnetic core, (9) is a tunnel erase head magnetic core, (2a) and (2b) are holders for forming the sliding surface of the head, and (5) is a magnetic circuit. (1) and to form
A back bar closely fixed to (9), (12) a read / write gap for recording and reproducing data, (13) an erase gap for erasing data, (3) and (10) respectively Read / write coils mounted on cores (1) and (9) for recording and playback, (3a) (3b) and (10a) (10b) read / write coil terminals, (3c) (10c) coil A center terminal, (6) is a gimbal for supporting the head, and (7) is an FPC for connecting the head coil and an electric circuit for driving the head. (7a) is an FPC land pattern, and (7b) and (7c) are FPCs connected to the head coil.
Terminal part, (7d) center line of FPC terminal part, (7e) conductive part on FPC for coil connection, (8) head coil and F
Electrical connection means with PC terminal part, (4) and (11) are erase coils for erasing data, (4a) (4b) (4c) and
(11a), (11b), (11c) are erase coil terminals, and (4d), (11d) are terminal short-circuit parts formed by lead wires of the erase coil.
The conducting portion (7e) on the FPC for connecting the coils conducts the coil center terminals (3c) (10c) and the erase coil terminals (4a) (11a) respectively.

Next, the operation will be described with reference to FIGS. FIG. 6 shows a preceding erase head. First, at the time of data recording, an erase current flows through the erase coil (4),
The magnetic flux passing through the magnetic core (1) is the erase gap (13).
The old recorded data that has leaked from the recording medium is broadly erased to form the non-recorded portion. Next, a recording current flows through the read / write coil (3), the magnetic flux passing through the magnetic core (1) leaks from the read / write gap (12), and new data is recorded. During data reproduction, the magnetic flux detected by the read / write gap (12) passes through the magnetic core (1) and intersects with the read / write coil (3), generating an output voltage between the terminals (3a) and (3b). .

In FIG. 1, the wirings of the FPC terminal portions (7b) and (7c) are arranged symmetrically with respect to the center line (7d).
With this arrangement, it can be commonly used for both the leading erase head and the tunnel erase head. However, since the head driving electric circuit and the head coil are not connected as they are, a terminal short-circuit portion (4d) by a lead wire is newly provided in the erase coil. By this part, the erase coil and coil center terminal (3
c) is connected and the head is ready for operation. FIG. 8 shows the connection between the head coil and the terminal portion of the FPC.

On the other hand, in the case of the tunnel erase head shown in FIG. 7, first, at the time of data recording, the read / write coil (1
A recording current flows in (0), the magnetic flux passing through the magnetic core (9) leaks from the read / write gap (12), and new data is recorded on the old recording data. Next, erase coil (1
An erasing current flows in 1), the magnetic flux passing through the magnetic core 9 leaks from the erase gap 13, and both sides of new recording data are slightly erased to form the non-recording portion.
During data reproduction, the magnetic flux detected by the read / write gap (12) passes through the magnetic core (9) and the read / write coil.
It intersects with (10) and generates an output voltage between terminals (10a) and (10b). Also in this case, as shown in FIG. 5, means similar to those of the preceding erase head, that is, a terminal short circuit portion (11d) by the lead wire of the erase coil is used to drive the erase coil and coil center terminal (10c) from the head drive electric circuit. )
Is connected and the head becomes operable. FIG. 9 shows the connection between the head coil and the terminal portion of the FPC.

As described above, the FPC of the present invention is
By devising the parts other than the above, it can be used in common with both the preceding erase head and the tunnel erase head.

Example 2. 10 (A) and 10 (B) show a preceding erase head according to the second embodiment of the present invention. The same effect can be obtained by using the terminal short-circuiting plate (14) as shown in FIG. 10 instead of the terminal short-circuiting part (4d).
In this case, the conventional erase coil (15) can be used. 10A and 10B show only an example applied to the preceding erase head, the same applies to the case of the tunnel erase head.

Embodiment 3. 11 (A) (B) (C) show a preceding erase head according to the third embodiment of the present invention. In FIG. 11 (A), (16) is an FPC with a terminal short-circuit wiring part, and a terminal short-circuit wiring part (1
6a) and (16b) are provided. At the time of assembling the head coil terminal and the FPC terminal portion by the electrical connecting means (8) at the time of assembling the magnetic head, the terminal short wiring portion may be directly electrically connected as shown in FIG. 11 (C). For the leading erase head, short (16a). The short wiring of (16a) consists of the terminal connecting part (4d) and the terminal shorting plate (1
It has the same effect as 4). In case of tunnel erase,
Short circuit (16b).

[0017]

As described above, according to the present invention, the FD
In the FPC for electrically connecting the head coil of the magnetic head used for D and the circuit, the wiring of the FPC terminal portion for selectively connecting either the preceding erase head or the tunnel erase head is symmetrical with respect to the center line. age,
A configuration in which the FPC terminal portion on the erase coil side that is electrically connected to the read / write coil center terminal is electrically connected to the drive circuit by short-circuiting the lead wire, conduction by the terminal short-circuiting plate, or directly electrically connecting the terminal short-circuit wiring portion. As a result, both the preceding erase and tunnel erase FPCs can be used in common, so that the types of FPCs are reduced, and the magnetic head device having higher productivity and lower cost than the conventional one can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing an assembling state of a preceding erase head in Embodiment 1 of the invention.

FIG. 2 is a perspective view showing an assembling situation of the preceding erase head in Embodiment 1 of the invention.

FIG. 3 is a perspective view showing an assembling state of the preceding erase head according to the first embodiment of the invention.

FIG. 4 is a perspective view showing an FPC terminal portion according to the first embodiment of the present invention.

FIG. 5 is a perspective view showing an assembling state of the tunnel erase head according to the first embodiment of the invention.

FIG. 6 is a perspective view showing a structure of a preceding erase head of the present invention and an enlarged view of a main part.

FIG. 7 is a perspective view showing a structure of a tunnel erase head of the present invention and an enlarged view of a main part.

FIG. 8 is a perspective view showing the connection between the coil and the FPC of the preceding erase head according to the first embodiment of the present invention.

FIG. 9 is a perspective view showing the connection between the coil and the FPC of the tunnel erase head according to the first embodiment of the present invention.

FIG. 10 is a perspective view showing the connection between the erase coil and the FPC short-circuit plate of the preceding erase head in Embodiment 2 of the present invention.

FIG. 11 is a perspective view showing the connection between the erase coil and the FPC of the preceding erase head according to the third embodiment of the present invention.

FIG. 12 is a perspective view showing the connection of the FPC terminal portion in the conventional preceding erase head.

FIG. 13: FP in a conventional tunnel erase head
The perspective view which shows the connection of a C terminal part.

FIG. 14 is a perspective view showing a connection between a coil and an FPC in a conventional preceding erase head.

FIG. 15 is a perspective view showing a connection between a coil and an FPC in a conventional tunnel erase head.

FIG. 16 is a perspective view showing a structure of a conventional preceding erase head.

FIG. 17 is a perspective view showing the structure of a conventional tunnel erase head.

[Explanation of symbols]

1 Leading erase head magnetic core 3 Read / write coil 3a, 3b Read / write coil terminal 3c Coil center terminal 4 Erase coil 4a, 4b, 4c Erase coil terminal 4d Terminal short circuit part (lead wire) 7 Flexible printed circuit (FPC) 7b, 7c FPC terminal part 7d FPC terminal part center line 7e Coil connection part (conduction part on FPC) 8 Electrical connection means 9 Tunnel erase head magnetic core 10 Read write coil 10a, 10b Read write coil terminal 10c Coil center terminal 11 Erase coil 11a , 11b, 11c Erase coil terminal 11d Terminal short-circuited part (lead wire) 12 Read / write gap 13 Erase gap 14 Terminal short-circuit plate 15 Erase coil 15a, 15b Erase coil terminal 16 Terminal with short wiring F
PC 16a, 16b terminal short wiring part

Claims (3)

[Claims] 1. A flexible printed circuit (hereinafter referred to as FPC) for electrically connecting a head coil and a circuit of a magnetic head used in a flexible disk drive (hereinafter referred to as FDD) for recording and reproducing information.
In the above, the wiring of the FPC terminal portion for selectively connecting either the preceding erase head or the tunnel erase head is symmetrical with respect to the center line, and the F on the erase coil side which is electrically connected to the read / write coil center terminal on the FPC.
By driving a lead wire to short-circuit the two erase coil terminals inserted in the PC terminal portion and the FPC terminal portion adjacent thereto, the erase coil side FPC terminal portion electrically connected to the read / write coil center terminal is driven. A magnetic head device characterized by being electrically connected to a circuit. 2. An FPC for electrically connecting a head coil of a magnetic head used for FDD for recording / reproducing information and a circuit, to selectively connect either a preceding erase head or a tunnel erase head. FP
The wiring of the C terminal portion is symmetrical with respect to the center line, the erase coil side FPC terminal portion is electrically connected to the read / write coil center terminal on the FPC, and the FPC terminal portion adjacent thereto.
A magnetic head device characterized in that an FPC terminal portion on the erase coil side, which is electrically connected to the read / write coil center terminal, is electrically connected to a drive circuit by electrically connecting the terminal portion to a terminal short-circuit plate. 3. An FPC for electrically connecting a head coil of a magnetic head used for FDD for recording and reproducing information to a circuit, wherein either a preceding erase head or a tunnel erase head is selectively connected. FP
The wiring of the C terminal portion is symmetrical with respect to the center line, the erase coil side FPC terminal portion is electrically connected to the read / write coil center terminal on the FPC, and the FPC terminal portion adjacent thereto.
By providing a terminal short wiring portion to the terminal portion and electrically connecting the terminal short wiring portion directly at the time of assembly, the FPC terminal portion on the erase coil side that is electrically connected to the read / write coil center terminal is electrically connected to the drive circuit. A magnetic head device characterized in that