JPH06309770A - Disk device - Google Patents

Abstract

PURPOSE:To suppress the occurrence of noise and to enhance the performance of the device by providing a control circuit for controlling recording and reproducing of information in the disk device and treating an FPC surface with antistatic processing for preventing the occurrence of static electricity. CONSTITUTION:When seek operation is performed by a head seek mechanism in the state of an FPC 20B in contact with a shutter, the FPC 20B is bent in accordance with this seek, and is slid on the shutter to generate static electricity, and this generated static electricity is charged on the surface of the FPC 20B. However, the charged static electricity escapes from an electrically conductive resin applied on the surface of the FPC 20B to a GND line, and hence the problem of its mixing into an input/output signal of a head as noise can be solved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device for recording and reproducing information on a disk.

[0002]

2. Description of the Related Art A disk device is a device for recording or reproducing information on or from a disk-shaped recording medium such as a magnetic disk or a laser disk. Is driven to rotate the disk, and the head is moved in contact with or approaching the disk for recording or reproduction. In such a device, the recording head is usually mounted on a carriage and moved (seek) along the radial direction of the disk by a motor,
As a result, recording and reproduction can be performed on any recording track on the disc.

Further, such a disk device is used as an external storage device of an electronic device such as a personal computer or a word processor, and is often incorporated in the main body of the electronic device. With the recent miniaturization and carrying of electronic devices, there is a strong demand for miniaturization and thinning of the above-mentioned disk device.

As a means for reducing the size and weight of the disk device in response to such a demand, a drive shaft for moving the carriage having the head mounted thereon is provided with a side edge of a disk cassette accommodating the recording medium. By arranging in the insertion direction of the disk cassette in close proximity to, and arranging the drive shaft in the vicinity of the rear end of the carriage on which the head is mounted so as to be orthogonal to the head carriage,
In some cases, the length of the disk device can be greatly reduced, and the object of reducing the size and weight of the device is achieved.

In the case of the above device configuration, an electric signal for the head to record information on the recording medium and an electric signal reproduced from the recording medium are used to record and reproduce information on the disc device. FPC (Flexible, print circuit) as a signal line for transmitting a signal between the control circuit for controlling the head and the head.
It) passes under the recording medium.

[0006]

As described above, when the disk device is downsized and the space efficiency is increased, the FPC is routed by the FPC routing method.
Is in contact with the disc cassette, the head records and reproduces information, so static electricity is generated by rubbing the contacting part when moving the carriage in the radial direction of the disc to perform seek. However, when the static electricity is charged and discharged, noise is mixed in the information recording / reproducing signal, which causes a problem in the operation and performance of the disk device.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a disk as a recording medium is rotated, and a head is moved in a predetermined direction so that the disk is moved relative to the disk. In a disk device for recording or reproducing information by using a disk device, a signal cable connecting the head and the control circuit is subjected to an antistatic treatment.

[0008]

As a result, a control circuit for controlling the recording / reproducing of the information of the disk device by the electric signal for the head to record information on the recording medium or the electric signal reproduced from the recording medium. In order to prevent the static electricity from being charged on the surface of the FPC for transmitting between the heads, the FP
By performing the antistatic treatment on the C surface, it is possible to suppress the generation of noise when static electricity is charged and discharged, and improve the performance of the device.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 are views showing an embodiment of a disk device to which the present invention is applied, and FIG. 1 is a plan view showing an internal structure of a disk cassette when a disk cassette is unloaded, without a cover, and FIG. 1 is a plan view showing the internal configuration at the time of loading in FIG. 1, FIG. 3 is a detailed view around the head seek mechanism at the time of loading seen from the direction of arrow A in FIG. 2, and FIG. 4 is seen from the direction of arrow B in FIG. FIG. 3 is a detailed view around the head seek mechanism during loading.

Inside the box-shaped base 10 having an open upper surface,
As shown in FIGS. 1 and 2, each component is housed. The base 10 is formed of a thin metal structure such as aluminum, and its upper surface is a cover (not shown) formed of a thin plate material of non-magnetic material such as aluminum for magnetic shielding and dust prevention. Is covered. The base 10
A front panel 13 is attached to the front surface of the.
A push button (eject button) 14 that is operated when ejecting the loaded disk cassette 11 is provided at the left end of the front panel 13.

In FIGS. 1 and 2, a cassette guide 15 for guiding the insertion, ejection, loading and unloading of the disc cassette 11 is held in the base 10 so as to be vertically movable and back and forth. The cassette guide 15 has a cross-sectional shape that guides and holds the disc cassette 11 inserted from the front side, and in the illustrated example, a substantially left half of the rear portion (back portion) is deleted to form a notch 16. It has a planar shape provided. Further, the cassette guide 15 is mounted at a position shifted to the right side with respect to the base 10 (rightward shift position), and on the left side of the base 10, the cassette guide 15 is moved up and down and back and forth to load a disk cassette. A space for arranging components such as a mechanism for loading and ejecting and a mechanism for driving the head carriage is formed.

1 to 3, in the area of the notch 16 of the cassette guide 15, the disc cassette 11 is formed.
Head seek mechanism 1 having a head 17 for recording or reproducing information on or from a disc (information medium) inside
8 are arranged. The head seek mechanism 18 is a mechanism for moving (seeking) the head 17 to an arbitrary track position along the radial direction of the disk.

In FIG. 1, reference numeral 181 denotes a head carriage to which a head 17 is attached, which is a lead screw 1 in which a screw groove is formed around the head carriage so as to be freely rotatable.
It is arranged so as to mesh with 82. The head carriage 181 is composed of a lower carriage on which a lower head 17B is arranged as shown in FIG. 3, and an upper carriage on which the upper head 17A is rotatably attached.

Reference numeral 183 denotes a motor for moving the head carriage, which is a gear pulley 18 attached to its rotary shaft.
4, timing belt 185, lead screw 182
The rotational force is transmitted to the gear pulley 186 fixed to the head pulley to rotate the lead screw 182 to drive the head carriage.

The head carriage 181 is a spring 18
It is always urged downward by 8 and its vertical movement is controlled by a shaft 187 arranged on the cassette guide 15. That is, when the cassette guide 15 is located at the upper position where the disc cassette can be attached and detached, the shaft 187
By pushing up the head carriage 181 against the spring 188, the head 17 is separated from the lower head so that the disc cassette can be loaded.
Further, when the disc guide is mounted and the cassette guide 15 descends into the apparatus, the shaft 187 descends together with the cassette guide 15 so that the head carriage 1
81 is urged downward by a spring 188 and abutted against the surface of the disk.

Further, the disc cassette 11 is provided with an opening for exposing a disc (magnetic disc or the like) as an information recording medium 11a (medium) housed therein and a slidable shutter 19 for opening / closing this opening. The disc guide 15 is provided on the disc guide 15 with the engaging pin 20 at the tip thereof as the disc cassette 11 is inserted.
A shutter opening / closing lever 20 that engages the shutter 19 of the disc cassette 11 and releases the shutter 19 is supported by a pin 202 so as to be rotatable and always urged clockwise by a spring 22. As a result, when the disc cassette 11 is loaded into the disc device, the shutter 19 is opened by the shutter opening / closing lever 20 by inserting the disc cassette 11 into the device through the opening of the front panel 13. By inserting the disc cassette 11, a lock mechanism (not shown) is released to move the cassette guide 15 downward and inward of the apparatus, the disc cassette 11 is engaged with a disc rotation spindle (not shown), and the shutter 19 is opened. The magnetic head 17 from the opened opening.
Is brought into contact with the disc to complete the loading operation of the disc cassette.

When ejecting the disc cassette,
By depressing the inkjet push button 14, the operation of loading the disc cassette is performed in the completely opposite manner, the disc guide 15 is raised and the disc guide 15 is moved to the outside of the front panel 13, and the spring of the shutter release lever 20 is moved. The return force of 22 ejects the disc cassette 11 and closes the shutter 19.

As shown in FIGS. 1 and 2, a head seek mechanism 18 for moving the head carriage in the disk radial direction is disposed in the region of the notch 16 of the cassette guide 15, and the head seek mechanism is provided. Since the components of the head seek mechanism 18 are arranged in a direction perpendicular to the seek direction, the head seek mechanism 18 projects less from the outer shape of the disk cassette 11 to the outside at the time of seek, and the compact size of the device is achieved. Is being promoted.

With the above-described structure, the head 17 has the disk 1
A flexible printed circuit board for transmitting and receiving between the head and the control circuit for controlling the recording / reproducing of the information of the disk device, the electric signal for recording information on the disk 1a and the electric signal reproduced from the disk 11a. FPC20
4 is a connector on the circuit board 21 arranged on the upper side of the base 10 after being once ejected from the head 17 in the outer circumferential direction of the disk 11a as shown in FIG. 22 is connected. In this embodiment, in addition to downsizing the device, the device is made thin, and since the gap between the disc cassette 11 and the circuit board 21 is small,
The FPC 20B coming out from the so-called zero-face head 17B on the lower side
Comes into contact with the shutter-19 of the disc cassette 11 due to the bulge caused by bending. Therefore, conventionally, this FPC2
The static electricity is generated due to the friction between 0B and the shutter 19 and is charged, and this becomes noise. In the present embodiment, this is solved as follows.

FIG. 5 is a diagram showing the structure of the FPC 20B. FIG. 6 is a sectional view taken along line CC of FIG. As shown in FIG. 5, the FPC 20B has an adhesive 62 on the base film 61.
Thus, the conductor 63 is adhered, and the cover lay 64 is disposed on the conductor 63. This coverlay 64 is a conductor 6
Of the three, the conductors other than the GND line 63G are insulated. From the coverlay 64 and the conductor GND line 63G, the static electricity charged on the FPC surface is ground line 63G.
A conductive resin (PIC) 65, which is a mixture of a polyimide resin and a carbon ink, is applied in order to escape through.

The volume resistivity of the PIC 65 can be adjusted by adjusting the mixing ratio of the carbon ink to the polyimide resin. The volume resistivity of the PIC is 1 × 10 ^2.
If it is ˜1 × 10 ⁷ Ω · cm, the static electricity charged on the FPC 20 can be released to the GND line. However, if the volume resistivity is small, the mixing ratio of carbon increases, so that the PIC 65 becomes hard and the flexibility of the FPC 20 decreases, and if the volume resistivity is large, the antistatic effect decreases. As a result, PIC6
The volume resistivity of 5 is preferably about 1 × 10 ⁴ . Further, in order to improve the flex resistance of the FPC 20B, the coverlay 64 is made of a polyimide resin having a thickness of 5 to 10 μm and a PI of
C65 is also applied in a thickness of 5 to 10 μm.
However, as long as the bending resistance is not impaired, the cover lei 64 may be adhered with a film of about 12.5 μm or 25 μm. In addition, the PIC65 is the FPC20.
It suffices to apply B to the side of the disc cassette 11 that comes into contact with the shutter 19, and it is not necessary to apply it to the cover ray 64. Further, the application range may be only the range in contact with the shutter 19.

When the head seek mechanism 18 seeks while the FPC 20B is in contact with the shutter 19,
FPC20B bends with the seek, and shutter 1
By sliding with 9, the static electricity is generated, and the generated static electricity is charged on the surface of the FPC 20B. However, the charged static electricity escapes from the PIC 65 applied to the surface of the FPC 20B to the GND line 63G,
It is possible to solve the problem of being mixed in the input / output signal of the head as noise.

According to the embodiment described above, the FPC 20
In order to release the static electricity charged on the surface of the
Since a polyimide resin (PIC) 65 mixed with carbon ink was applied to the surface of 20, the FPC 20 and the shutter 19 of the disk cassette 11 and the FPC 20 slide to generate static electricity, and the potential of the static electricity charged on the FPC 20 rises. However, since the metal parts arranged in the device and the shutter 19 of the disc cassette 11 are not discharged to generate noise, a compact and lightweight disc device with improved reliability is realized. I was able to.

In the above embodiment, the PIC 65 is applied to the portion of the disk cassette 11 where static electricity is generated due to the sliding of the shutter 19 and the FPC 20, but other structural parts disposed inside the apparatus slide on the FPC 20. Even when static electricity is generated by applying the PIC 65, the same effect as described above can be obtained, and the antistatic material chamber to be applied need not be limited to the PIC 56. In addition, when connecting the PIC65 to the GND of the device,
Although the PIC65 is directly applied to the 20 GND lines 63G, other GND lines may be brought into contact with the PIC65.

[0026]

As is clear from the above description, according to the present invention, information is recorded on or reproduced from the disc by rotating the disc as a recording medium and moving the head in a predetermined direction. In a disk device for performing the above, a control circuit for controlling recording and reproduction of information of the disk device by an electric signal for the head to record information on the recording medium and an electric signal reproduced from the recording medium. FP for transmitting between heads
By coating the surface of C with an antistatic substance and connecting the antistatic substance with the GND of the device, F
The surface of the PC is not charged with static electricity, and the operation or performance of the device is not hindered by the discharge of static electricity. Therefore, the size and weight of the device can be reduced and a disk device with improved reliability can be provided. You can

[Brief description of drawings]

FIG. 1 is a plan view showing an internal structure of a disk device according to the present invention and a state during unloading.

2 is a plan view showing a loaded state of the disk device shown in FIG. 1. FIG.

3 is a side view showing details around the head seek mechanism as viewed from the direction of arrow A in FIG.

FIG. 4 is a side view showing details around the head seek mechanism as viewed in the direction of arrow B in FIG.

FIG. 5 is a diagram showing a structure of an FPC in the present invention.

6 is a cross-sectional view taken along line CC of FIG.

[Explanation of symbols]

 10 Base 11 Disc Cassette 11a Media 13 Front Panel 15 Cassette Guide 16 Notch 17 Head 18 Seek Mechanism 19 Shutter 20 FPC 21 Circuit Board 22 Connector 61 Base Film 62 Adhesive 63 Conductor 64 Coverlay 65 PIC

Claims (2)

[Claims] 1. By rotating a disk as a recording medium and moving a head in a predetermined direction,
A disk device for recording or reproducing information on or from the disk, wherein a signal cable connecting the head and the control circuit is subjected to antistatic treatment. 2. The disk device according to claim 1, wherein a portion of the surface of the signal cable subjected to antistatic treatment is connected to the GND of the disk device body.