KR810000793B1 - Recording disc - Google Patents

Abstract

A magnetic disk member for a memory disk file usable in a data processing system includes an eccentric multilobed triangular center locating hole to facilitate concentric mounting of the locating hole centerlines in a multiple disk pack memory. The disks are centered in a disk pack by placing onto a drive hub having ribs to match the lobes.

Description

Recording disc

1 is a plan view of a recording disk having a center point fixing hole according to the present invention.

FIG. 2 is an enlarged view of the vicinity of the center point fixing hole in the disk of FIG. 1 with the drive hub assembly. FIG.

3 is a diagram showing an eccentric positional relationship of a disk in a conventional disk device.

4 is an isometric view of a disk pack including a disk and drive hub assembly according to the present invention.

The present invention relates more specifically to a dynamic information recording medium, and more particularly to a special structure of a disk support device and a disk pack storage device related thereto.

[0003] An impure-free memory device, generally known as a disk drive device, includes a single rotating disk or a plurality of rotating disks called stacks as a storage means for a data processing device.

In the case of such a device, one or more discs are installed so as to rotate about a fixed vertical or horizontal axis, near which an access mechanism for driving a series of READ / WRITE conversion heads on a support device. Mechanism) is provided. Typically, the reaching mechanism has a linear motor for driving a movable support arm carriage connected to the support arm. The support arms are also arranged radially on the disc centerline axis to easily move the transducer radially from the disc surface.

With the disc pack rotating at a constant speed, the conversion head is positioned at any one of the discontinuously placed positions along the radius of the disc. Thus, data recording and reproducing for concentric data tracks on the surface of the disc are made. In recent devices, a plurality of data tracks are arranged at very narrow intervals to increase the amount of data that can be recorded on each disk surface. In order to precisely match the center of the circle of each data track, i.e. to prevent the disc's centerline from slipping out of the concentric circle of the data track, the center fixation hole of the disc remains within a very tight tolerance to the drive hub. You must.

Conventionally, the central fixation hole of each disc was perfectly circular to fit the circular drive hub of the disc pack. In this case, the hole and hub for positioning the disk should be precisely installed to prevent the disk from moving out of the concentric position during the operation in which the centrifugal force is applied to the disk.

SUMMARY OF THE INVENTION An object of the present invention is to provide an improved and economical disc recording member and disc pack drive device used in a rotary memory device. However, mechanical drive mechanisms have already been used with non-circular connections in order to secure the shaft to the hub.

Among the known ones are, for example, sockets and shanks assembled to constitute a locking device. The shank and the socket both consist of a coupling device in which the bow-shaped bearing backs, which are separated by an angle, form an overall cylindrical surface. The shank is fitted into the socket to provide a cylindrical bearing surface, whereby the drive member and the driven member are aligned in the axial direction. The arch, or eccentric bearing surface, is completed by wedge action. The outer socket has a bearing surface that forms an eccentric multi-lobed center point fixing hole that engages a similarly shaped hub to mate the bearing surface. However, this United States patent discloses discs with eccentric multi-lobed center point fixing holes engaged with hubs to ensure the position of the center point of each disc in the disc pack and to correct the transverse position of the disc. Not.

Accordingly, an object of the present invention is to provide a self-centering disc having a multi-lobed central fixing hole as a disc including a device for storing information on a recording disc used as a storage device. Is in. Individual discs are inspected for quality control to locate the defects and remove too many defective discs before they are assembled into disc packs. The part with the bond is usually the part where the magnetic film is not thick enough to record the magnetic transition in response to the data. However, all mechanical connections require tolerance ratings, since the mechanisms for forming holes in the discs and the soccer moving devices of the discs vary depending on the tool used or the state of use. Thus, when checking a track using a specific hub, the center of the circle may not always be in the same place, and the position of the track inspected by a single disk checker may change when the disk is assembled into a complete disk pack.

Among the patents already found, one can find discs with a dove-shaped hole for precise centering of each disc in the disc pack. In this case, however, the multi-row hole of the disk is not used to actually drive the disk, nor is it intended to automatically center the disk as a hub drive member.

Rows of the central hole of the disc are combined with a position detection device that places each lobe in the correct position. These lobes are inspected to optically check the disc position and there is no contact between the disc and the drive hub member.

Therefore, another object of the present invention is to make an eccentric polygonal center point fixing hole in a magnetic disk that engages with the hub hole so that the center of the disk is always in the same place without the need for tight fit tolerances.

A recording disk for automatic center grabbing in a disk file used as a dynamic storage device in accordance with the present invention includes an eccentric polygonal center point fixing hole in a flat substrate constituting the disk with means for storing information as a magnetic change. Individual discs can be assembled into disc packs that process signals by the conversion action between the transducer and the rotating disc. Here, each disk is composed of an eccentric multi-lobed center point fixing hole and information stored in the form of pulses such as magnetic transitions, and a device for detecting and converting the magnetic transitions to read the information.

The disk pile has a rotating drive hub assembly with a number of lobes and an equal number of projections in the center point fixing hole of the disk. The protrusion of the hub is adapted to contact the center positioning hole of the disc to drive the disc.

A drive, such as an electric rotary motor, is connected to the hub assembly to rotate the disk through the hub protrusion. There is a means to write data into the rack or to keep the converters in close contact. That is, means are provided such as linear motors, arm carriages and positioning arms supporting the transducers in order to write the data in concentric tracks of the disc or vice versa to place the transducer in the correct position for reading data therefrom. It is therefore an object of the present invention to provide an improved recording disc and disc pack device.

It is another object of the present invention to provide a rotary disk with a multi-lobed center point fixing hole and a disk to allow accurate centering and driving of the disk without a tight tolerance fit between the hub assembly and the positioning hole of the disk. An information processing storage device including a drive hub assembly having a plurality of projections for contacting a center positioning hole of a disk to rotate relative to a conversion device.

Embodiments of the present invention will now be described in detail with reference to the drawings. In FIG. 1 the disk 10 has an eccentric multi-lobed center point fixing hole 12. The disc 10 itself is made of known material suitable for use in a data processing system. For example, a rotating coating of an aluminum disk substrate with a magnetic layer of iron oxide capable of magnetizing to store magnetic pulses is used. Alternatively, discs can be used that use plastic substrates that record voice and optical impulses that can be written or read using a transducer that uses light from a laser system. What material the disc is made of has nothing to do with the invention. As mentioned above, it is an object of the present invention to provide a recording disc having an accurate center position fixing hole which allows the disc to be more densely packed along the circumference.

2 is an enlarged view of the positioning hole 12 of the disk 10. In the present embodiment, the eccentric drow-shaped center hole 12 of the disk 10 consists of three lobes 14 having a span of 120 ° 1/4. The drive hub 16 has three ribs 18 to fit into the lobes 14 of the center hole 12 and to rotate the disc left, for example, as indicated by the arrow 20. The number of ribs 18 attached to the hub 16 corresponds to the number of lobes 14 of the center hole 12. The number of lobes of the center hole 12 and the corresponding number of ribs 18 of the hub 16 are not limited to three.

That is, the center hole 12 is a multi-row type with a plurality of lobes. In addition, the disk 10 can be rotated right as well as left. This is because the rib 18, whether it is left turn or right turn, can drive the disk 10 in contact with the bow-shaped bearing surface 22 that is appropriately spaced apart by a predetermined angle.

Since the arch bearing 22 of the lobe 14 of the central hole 12 in the disk 10 contacts the rib 18 around the hub 16 as the drive hub 16 and the disk rotate. The center is automatically fixed while rotating around the hub 16. That is, the center line of the disk and the center line of the hub coincide. Thus, the possibility that the center of the disc may be uneven when the standard disc drive technique is used disappears.

3 illustrates a typical standard technique for driving a conventional disk in a disk pack assembly used in a data processing system. The driving hub 38 and the center point fixing hole are both circular.

The disc 30 is held in the drive hub 38 for rotation. In order for the operator to attach the disk to the hub, there must be a dimension difference between the center hole of the disk and the hub.

Thus, no matter how precisely the size difference between the center hole of the hub and the disk is controlled, there is a slight gap between the hub and the center hole of the disk. This is especially true when clamping multiple disks to a single hub.

Obviously, when the disc is secured to the drive hub, the gap between the hub and the hole can be oriented in any direction around the hub.

Obviously, the disk is preferably mounted to the hub so that it is evenly spaced throughout the hub. In particular, when used in relation to data processing, it is necessary to examine individual disks in the same state as in actual use to obtain a disk having a join point below a certain minimum value.

However, there are the following problems with this.

For example, suppose the disk is inspected eccentrically in one direction and a test result is obtained with no defects on the surface of the disk. However, when the disc is finally assembled into a disc pack and the disc is eccentric in a different direction than during inspection, the conversion head will follow a concentric circular track unlike during inspection. In this case there is no guarantee that the track will be free of defects, such as a track that has been inspected before. For example, FIG. 3 shows the track that the conversion head will trim when the disc 30 is in two different eccentric positions. In other words, the center hole of the disk 30 in one position is indicated by the solid circle number 32 and the center hole of the disk 30 in the other position is indicated by the dotted line circle 34 (for clarity, Only one circle is shown). The disk 30 has three coupling points 36. The drive hub 38 exhibited a smaller diameter than the center point fixing hole of the disk. The dimension difference between the diameter of the center hole of the disk 30 and the diameter of the hub 38 is t, and when the center hole is driven by the solid line, a gap of t is formed on the left side of the hub 38 when the center hole is driven. As indicated by the broken line 34, when driven, a gap is formed on the right side of the hub 38 by t. This indicates the worst case disk drive and is exaggerated for clarity.

The information tracks 40 and 42 respectively indicate the trajectories of the points on the disc that face the conversion head when the disc's center hole is in the position indicated by the circles 34 and 32, respectively. In other words, the track 40 shows a track in which the conversion head is traced when the center hole is driven to the left as shown by the circle 32 (when a gap t is formed on the left side of the hub 38).

In this case, the track 40 has no leading edge defects. However, the track 42 tracked by the head on the disc with its center hole pushed to the right as indicated by circle 34 is track 42. In this case, the head meets three joining points.

For example, if the state of the disk 30 in which the center hole is at the position indicated by the solid circle 32 and the track is indicated by the solid circle 40 is considered to be the state of the disk 30 under inspection, the coupling point Is not detected, so the disc passes the test. However, when the disc is actually attached as a disc pack and the gap t is created on the opposite side of the hub, the head tracks the track indicated by the broken circle 42. Therefore, a defect point is detected and the disk needs to be excluded as unsuitable for use. To replace this disk, you must disassemble the entire disk pack. This problem becomes more important as the track density of the disc increases.

In the case of using the disc 10 having a dive-shaped center point fixing hole according to the present invention as shown in FIG. 2, it is easy to attach the disc to the hub 16. FIG. First, the disk 10 may be disposed in a positional relationship in which the tip of the lobe 14 directly faces the rib 18 of the hub 16.

The center point fixing hole 12 has a radius longer than the distance from the center of the hub 16 to the rib 18 at the tip of the lobe 14. Next, the disk 10 is rotated in the reverse direction to the drive rotation direction during operation while keeping the hub 16 at a stationary state. In addition, the driving rotation direction at the time of operation | movement does not matter whether it is left turn or right turn.

In either case, the rib 18 is in contact with the bearing surface 22 of the center point fixing hole. In addition, since all disks are correctly positioned with respect to the central axis, the balance between each disk and each other in the disk pack is maintained well. In addition, the rework of the disc pack is relatively easy because the placement of the joining points on each disc is maintained at the same track displacement, and defects are noted by recording the initial position of each lobe relative to the particular rib of the hub. It is possible to keep the positional relationship of the sectors intact. That is, if a disk is rearranged so that any rib of the hub contacts the same bearing surface as previously touched, the sectors of each disk stay in the same position.

As shown in FIG. 4, the disc with a drab-shaped center point fixing hole according to the present invention is a rotary drive hub assembly, a drive device for rotating a hub and a disc, and a position of a conversion head for detecting information recorded on the disc. It is combined with a changer installed in the reaching mechanism to adjust it. When assembling, each disc is placed around the drive hub so that the lobe tip of the center point fixing hole is in a position around the drive hub, ie facing the rib.

The disk is then rotated in the reverse direction of the drive rotation direction during operation to fix the disk with the projection of the drive hub in contact with each bearing surface of the disk. In the case of configuring a disk pack with a plurality of disks, spacers are attached each time each disk is attached to the drive hub so that each conversion head can move each disk surface. The disc later installed is disposed around the drive hub as in the case of the previous disc and then rotated in the opposite direction of rotation in operation until the bearing surface of the center point fixing hole contacts the projection of the drive hub.

The remaining disks are attached to the hub in the same order, with the spacers in between. In addition, clamping means may be attached to the driving hub to prevent the disk and the driving hub from moving relatively in operation.

In Fig. 4, the magnetic recording disc pack is used for recording and reproducing magnetic impulses.

The rotatable spindle 50 is rotated by the motor 52 and drives the hub 16 of the hub assembly. The hub 16 rotates a plurality of disks 10. These discs are separated and are accessed (accessed) to a plurality of magnetic recording heads 54. Each head 54 is connected to a slide arm 56. The slide arm 56 is attached to the carriage 58 which is movable in the direction perpendicular to the rotational direction of the disk 10. The carriage 58 is adjusted with a linear positioning device 60 such as a voice coil motor in order to place the magnetic head 54 at the desired location of the disk 10. The magneto-transformation (recording and reproducing) head 54 is a conventional floating head with an air bearing surface for slightly raising the head. The disc 10 is also a standard disc made of aluminum or a layer made by applying a rotating material to a substrate made of an aluminum alloy of aluminum and manganese and a magnetic material mixed with a binder in iron oxide.

The conversion head 54, together with the slide arm 56, the carriage 58, and the linear positioning device 60, properly positions each conversion head on the magnetic surface of the disc to record and reproduce magnetic impulses in a known manner. I make a mechanism to let you do it.

The center point fixing hole 12 of the disk is constructed in accordance with the present invention including an eccentric elliptical lobe 18 for contacting a plurality of projections provided around the hub 16.

In the preferred embodiment shown in FIG. 2, the disk 10 has three lobes 14 with three bearing surfaces 22 for contacting three ribs 18 around the hub 16 of the hub assembly. )

When assembling the disc pack, each disc 10 is placed around the hub in a positional relationship in which the ribs 14 face the ribs 18. If the rotational driving direction of the hub 16 is left rotation as indicated by the arrow 20, the rib 18 is eccentric bow-shaped bearing of the center positioning hole 12 with the hub stopped when assembling (22). Turn the disk 10 right until it touches.

In this manner, after all the disks are attached, a hub clamp (not shown) is installed on the disk 10 so that there is no relative movement between the hub and the disk.

Another advantage of making the multi-lobed center point fixing hole 12 in the disk 10 is that the disk pack can be disassembled without disturbing the relative positional relationship between the disks in the disk pack.

The approximate positional relationship of each disk is recorded by marking the specific rib 14 of each disk 10 on the specific rib of the hub 16, for example, the rib 18a. While maintaining the same lobe in contact with the indicated ribs 18a, the entire disk can be released from the disk pack and repositioned.

Thus, when the disk rotates in contact with the rib 18 of the center point fixing hole 12 of the disk, the disk is positioned in the same position as before with respect to the hub 16. The positional relationship with the other disk after the next disk is inserted in the same way and rotated until it touches the rib of the hub becomes the same as the positional relationship before disassembly in the disk pack.

The embodiments illustrated above clearly indicate the principles of the present invention. Those skilled in the art will readily appreciate changes in structure, arrangement, corrugation, components, materials, components, etc. used in the embodiments of the present invention. For example, disk piles are commonly used in data processing systems to magnetically store information in a layer of iron oxide applied on an aluminum substrate. In addition, as can be seen from the above description, it is advantageous that the disc for use in the optical system also has a multi-lobed centering hole according to the present invention.

The disk may be a non-metal such as glass or plastic, or may have a magnetic layer formed by plating or a magnetic layer formed by powder coating, or may include a modified optical track such as used in a method of optically reading the surface deformation of the disk coating layer. It may be. The main advantage of the present invention is that it can maintain the concentric positional relationship of the concentric data tracks, but this also applies to the spiral track.

Claims (1)

In a recording disk composed of a circular planar substrate, a means for storing information on the substrate, and a center point fixing hole, the center point fixing hole has an eccentric multi-lob shape to automatically fix the center point with respect to the drive hub. Recording disc.

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