JPS59121658A - Magnetic disc device - Google Patents

Abstract

PURPOSE:To attain the detection of an index at the reverse setting of a disc by arranging the 1st index detector in accordance with the position of an index detecting window of the disc and the 2nd index detector on a position to be point-symmetrical with respect to the rotational driving center of disc of the 1st index detector. CONSTITUTION:When the disc is reversely set up on the device, the index detecting window 22 is opposed to the 2nd index detector 100 and a record protecting notched part 23 is opposed to the 2nd record protecting part detector 110. Therefore, an index detecting signal is generated from the 2nd index detector 100 and fed to a computer and the opening/closing status of the notched part 22 is detected by the 2nd record protecting part detector 110 and the detecting signal WBS is supplied to the computer. Even if the disc is reversed, the index and the record protecting part can be detected in the same manner as regular setting, so that normal recording/reproducing can be attained.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to improvements in single-sided magnetic disk drives.

[Technical background of the invention and its problems]

Conventionally, there is a 70 disk device configured as shown in FIG. 1, for example. That is, this device includes a recording medium drive motor 2 and a tracking pulse motor 3, and transmits the rotational driving force of the media drive motor 2 to a spindle 4 via a belt (not shown). , which drives the system spindle 4 to rotate. This spindle 4 is for rotationally driving the media. On the other hand, the rotation angle of the tracking pulse motor 3 is transmitted to a tracking mechanism (not shown), which drives the tracking mechanism to move the head 5 attached to its tip in steps in the radial direction of the media. I try to let them do it. The device also includes a clang arm. The clamp arm 6 is configured to be rotatable in a direction perpendicular to the surface of the chassis 7 (direction perpendicular to the plane of the paper in the figure) using its rear end as a fulcrum.
By operating the grip portion 6a protruding from the front of the device, the media inserted into the device is removably held. In the figure, reference numeral 9 denotes a pad arm, which is a sponge-like presser attached to the tip of the pad arm, which presses down the media and brings it into contact with the head 5 with an appropriate contact force.

Now, this device is equipped with two detectors lθ, 11 for index detection and record protection section detection. These detectors 10.11 are composed of optical switches, for example. The position of the index detector 10 is determined in accordance with the position of the index detection hole 22 provided in the jacket 21 that accommodates the media 20, as shown in FIG. Further, the recording protection portion detector 11 is arranged so as to correspond to the position of a notch 23 which is provided at the edge of the jacket 21 and serves as a recording protection portion. Note that 24 and 25 in FIG. 2 are a shaft hole into which a rotational drive shaft is inserted, and a head contact window, respectively.

To operate such a device, first, with the clamp arm 6 open, insert the disk (FIG. 2) in the direction of arrow A and push it to a predetermined position to set the clamp arm. At this time, the index detector 1o and the index detection hole 22 of the disk, and the recording protector detector 1o and the notch 23 of the disk, are opposed to each other. Therefore, the recording protector detector II first detects whether the inserted medium 20 is recordable or not. In addition, in this case, the notch 23
It is detected that recording is possible when the notch 23 is open or remains as is, and it is detected that recording is not possible when the notch 23 is closed by pasting tape or the like. In this state, when the media drive motor 2 is driven to rotate the media 20, the index detector 10 detects the media 20.
The index of o is detected, and the apparatus records and reproduces information on the medium 2o based on the timing of detection of this index. Also, at this time, the tracking of the media 20 and the rotation angle of the tracking pulse motor 3 are specified to be varied.

Thus, information is recorded and reproduced on a predetermined recording surface of the medium 2o.

Incidentally, in recent years, many attempts have been made to make it possible to record information on both sides of a medium in order to increase the storage capacity of one medium. In order to achieve this, conventionally, a head is provided for each recording surface of the media, and the media is held between these heads so that information can be recorded on each recording surface of the p1 media. .

However, such conventional double-sided recording devices
Since the recording surface of the media is constantly held between the heads, the media suffers from severe wear and has a disadvantage that its lifespan is significantly shorter than that of single-sided media. Furthermore, since each of the two heads must be tracked separately, the tracking mechanism becomes complicated, leading to an increase in the size of the device.Furthermore, the recording/reproducing system becomes two systems, which complicates the circuit configuration. The disadvantage was that the equipment was expensive.

[Purpose of the invention]

The present invention enables double-sided recording by simply adding a simple configuration to a single-sided magnetic disk device, by turning the disk over, and extends the life of a single-sided magnetic disk with a simple configuration. The purpose is to provide equipment.

[Summary of the invention]

In order to achieve the above object, the present invention provides an apparatus with a first index detector whose position corresponds to the index detection window of the disk, and the point of this detector is symmetrical with respect to the rotational drive center of the disk. A second index detector is provided at a position such that the second index detector detects the index when the disc is set upside down.

Still another aspect of the present invention provides the first and second index detectors of the above invention, and additionally includes a first record protection part detector for detecting the record protection part of the index, and a first record protection part detector for detecting the record protection part of the index. A second record protector detector is provided for detecting the record protector when the disk is in use, and these detect the index and the record protector on both sides of the disc.

[Embodiments of the invention]

FIG. 3 is a plan view showing a schematic configuration of a magnetic disk drive according to an embodiment of the present invention, and the same parts as in FIG. 1 are given the same reference numerals and detailed explanations will be omitted.

A second index detector 100 is installed at a position of the index detector 10 that is point symmetrical to the rotational drive shaft 4a of the spindle 4. This second index detector 100, like the index detector 10 (hereinafter referred to as the first index detector), has a light-emitting element and a light-receiving element arranged facing each other at a distance from each other, and has a disk inside the device. When set upside down, the index detection window 22 provided on the left side 21
to face. Then, the index of the media is detected through this index detection window 22.

On the other hand, on the opposite side of the chassis 7 where the recording protection section detector 11 is installed, a second recording protection section detector 11θ is disposed. The second record protection part detector 110 is composed of an optical switch, similar to the record protection part detector 11 (hereinafter referred to as the first record protection part detector). Then, when the disk is set upside down in the apparatus, the open/closed state of the notch 23 provided in the jacket 21 is detected.

The detection outputs WAS and WBS of each of the recording protection section detectors 11 and 110 are logically summed in an OR circuit 31 as shown in FIG. 4, and then led to a NAND circuit 32. Further, the detection outputs IAS and IBS of the index detector 10 and 1θθ are logically summed in an OR circuit 33 and then led to a NAND circuit 34. Then, each of these detection outputs WAS, , WBS and IAS,
The IBS is dart-controlled by each NAND circuit 32, 34 in accordance with a drive select signal ("L" level) from a computer (not shown), and is sent to the computer.

With such a configuration, when the disk is first inserted in the conventional conventional state, the index detection window 22 of the disk faces the first index detector IO, and the notch 23 serving as the recording section is opposed to the first record protection detector 1. Therefore, the open/closed state of the record protector 22 is detected by the first record protector detector 11, and its detection output WAS is sent to the computer side via the OR circuit 31 and the NAND circuit 33.

At this time, the second recording protection detector 110 is blocked by the disc jacket 21, so it becomes the "L# level. As a result, the computer determines the level of S to the detection output W. It is possible to judge whether or not recording is possible on the disc.Meanwhile, the index of the medium 20 is detected by the first index detector 10, and this detection output JAS is sent to the OR circuit 33 and the NAND circuit 34. is sent to the computer via the
The index detector 110 is blocked by the jacket 21, does not perform any index detection, and maintains the "L" level. Therefore, the computer can control recording and reproduction based on the index detection output JAS.

Next, if you turn the disc upside down and set it in the device,
The index detection window 22 is the second index detector 1
00, and the recording protection notch 23 faces the second recording protection detector 110. Therefore, the index detection signal IBS is generated from the second index detector 100 and sent to the computer, and the open/closed state of the notch 22 is detected by the second recording protector detector 110, and the detection signal IBS is sent to the computer. WBS is sent to the computer. As a result, even when the disc is turned over, index detection and recording protection portion detection can be performed in the same way as when the disc is set in the normal state, and thereby normal recording and playback can be performed.

As described above, in this embodiment, the first and second index detectors 10 and 100, which detect the index detection window 22 and the notch 23, and the first and second recording Since the protector detector '1rlio is provided, recording and reproduction can be performed on both sides simply by turning the disc over. Therefore, unlike the conventional double-sided magnetic disk drive, it is not necessary to sandwich the media between two heads, so that wear of the media can be reduced and its lifespan can be extended.

Furthermore, the tracking mechanism and the recording/reproducing system circuitry can be implemented using single-sided IT, which greatly simplifies the configuration and provides an inexpensive device compared to conventional double-sided devices.

Note that the present invention is not limited to the above embodiments.

For example, if there is no need to perform record protection detection, just add an index detector, and then! 1llf
It may also be possible to perform recording and reproduction on the back side of the disc.

In addition, each detector may be a reflective switch instead of a light transmission switch, or a mechanical switch such as a microswitch.

〔Effect of the invention〕

As described in detail above, the present invention provides a device with a first index detector whose position corresponds to the index detection window of the disk, and which is symmetrical with respect to the rotational drive center of the disk. A second index detector is provided at the position, and this second index detector detects the index when the disc is turned over, set, or pushed.

Still another aspect of the present invention provides the first, second, and second index detectors of the above invention, and in addition, a first recording protection portion detector for detecting a recording protection portion of the disc; A second record protector detector is provided for detecting the record protector when the disc is turned over, thereby detecting the index and the record protector on both sides of the disk.

Therefore, according to the present invention, by simply adding a simple configuration to a single-sided magnetic disk device, double-sided recording can be performed by turning the disk over, and the disk life can be extended with a simple configuration. It is possible to provide a magnetic disk device that obtains the desired results.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a schematic configuration of a conventional magnetic disk device, FIG. 2 is a perspective view showing the configuration of a disk, and FIG.
FIG. 4 is a plan view showing a schematic configuration of a magnetic disk device according to an embodiment of the present invention, and FIG. 4 is a circuit diagram showing a logic operation circuit for each detector output. DESCRIPTION OF SYMBOLS 10... First index detector, 100... Second index detector, 1 No.... First recording protection part detector, 110... Second recording protection part detector, 20・
... Media, 2 No. ... Jacket, 22 ... Index detection hole, 23 ... Notch part (recording protection part). Applicant's representative Patent attorney Takehiko Suzue No. 1!11 Figure 2 Figure 3 Figure 4 Director of the Patent Office Kazuo Wakasugi 1, Indication of the case Patent application No. 1983-231350 2, Name of the invention Magnetic disk Apparatus 3, Relationship with the person making the amendment Patent applicant (356) Tokyo Electric Co., Ltd. 4, Agent 6, Specifications to be amended, Drawing 7, Contents of the amendment (1) "Claims" attached as an attachment Correct IJ. (2) Specification notice, page 7, line 8, negative page 8, page 8, line 2 (-5) Correct "point symmetry" to "left-right symmetry". (3) ) The drawings and Figure 3 have been revised as shown in the attached sheet. 2. Claims (1) A recording medium housed in a jacket having an index detection window is set, and a head is applied only to one side of the recording medium. In a magnetic disk device that performs recording and reproducing operations in contact with each other, there is provided a first index detector disposed at a position facing the index detection window, and a rotational drive center of the recording medium of the first index detector. A magnetic device characterized in that it is completely equipped with a second index detector arranged at a symmetrical position and configured to face the index detection window of the jacket and perform index detection when the recording medium is set face up. Disk device. (2) In a magnetic disk device in which a recording medium housed in a jacket having an index detection window and a recording protection section is set, and a recording/reproducing operation is performed by fully contacting the head only on one side of the recording medium, a first index detector disposed at a position facing the index detection window; and a rotational drive center of the recording medium of the first index detector (disposed at a position symmetrical to the recording medium). a second index detector that performs index detection facing the index detection window of the jacket when the medium is set upside down; and a first record protector disposed at a position facing the record protector of the jacket. and a second recording protection part detector disposed at a position facing the recording protection part of the jacket when the recording medium is set upside down. .

Claims (2)

[Claims] (1) In a magnetic disk drive in which a recording medium housed in a jacket having an index detection window is set and a head contacts only one side of the recording medium to perform a recording/reproducing operation, a position facing the index detection window. and a first index detector disposed at a point symmetrical position with respect to the rotational drive center of the recording medium of the first index detector, and when the recording medium is set upside down. A magnetic disk drive comprising: a second index detector that performs index detection in opposition to the index detection window of the jacket. (2) In a magnetic disk device in which a recording medium housed in a jacket having an index detection window and a recording protection section is set and a head is brought into contact with only one side of the recording medium to perform a recording/reproducing operation, the index detection A first index detector disposed at a position facing the window; and a first index detector disposed at a point symmetrical position with respect to A while the first index detector detects the recording medium while the recording medium is being rotated. a second index detector that performs index detection while facing the index detection window of the jacket when set upside down; and a first record protection portion detector disposed at a position facing the record protection portion of the jacket. 1. A magnetic disk device comprising: a second recording protection portion detector disposed at a position facing the recording protection portion of the jacket when the recording medium is set upside down.