JPH0785326B2 - Information processing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is for driving an information storage medium such as an optical disc and recording, reproducing, or erasing information by using a laser beam or the like during its rotation. The present invention relates to an information processing device that performs information processing.

[Conventional technology]

In recent years, an information processing device using an optical disk as a storage medium can significantly increase the amount of information stored as compared with a magnetic information processing device that has been widely used in the past, and has very little noise and is extremely good and stable. In addition to the information reproduction state being obtained, the memory state is extremely stable because it is not easily affected by external factors, and information processing can be performed in a non-contact state, and there is no adverse effect such as damage to the storage medium and the information processing head. It is being used a lot because of its features.

In addition, along with this trend of increasing usage, it has recently been demanded to make the information processing apparatus of this kind, for example, an information recording / reproducing apparatus, as thin as possible, light in weight, and low in cost.

On the other hand, in the conventional device, as shown in FIG. 5 and FIG.
In the case of fixing the information storage medium (optical disk) a to the turntable b side via the clamper c, the information storage medium (optical disk) a is pressed.

FIG. 5 shows a structure in which a pressing force is applied to a clamper c via a supporting means e provided with a biasing body d such as a spring, and a structure shown in FIG. And a pressing force is applied to the clamper c by a magnetic attraction force generated between the clamper c and the turntable b made of a magnetic material.

[Problems to be solved by the invention]

However, in such a conventional device, not only the clamper c is required, but also a moving space necessary for moving the clamper c must be formed, and the clamper c is contacted and separated. A mechanism etc. is required. For this reason, the structure of this portion becomes complicated and large, which is not only a major obstacle to thinning, weight reduction and cost reduction, but also there is a problem that assembly and maintenance are troublesome.

Further, in the former (FIG. 5), since the turntable a is always in a state of receiving a force, the turntable b and the rotary shaft g integral with the turntable b must be strengthened.
Also, in the latter (FIG. 6), the holding force varies depending on the thickness of the information storage medium a, and when the information storage medium a is a relatively thick one where two substrates h are stuck together, it is possible to be sure. There is a problem that it may not be able to be pinched.

Further, conventionally, the inner diameter portion i of the information storage medium a, that is, the inner diameter portion of the synthetic resin substrate h is directly fitted to the positioning portion j formed on the turntable b side to perform positioning. Therefore, the diameter of the inner diameter portion i of the information storage medium a may change for a long time, and the center and the rotation center of the pre-groove (not shown) spirally formed on the substrate h at a pitch of 1.6 μm. However, there is a serious problem that the eccentricity becomes large and the recording / reproducing of information is adversely affected.

The present invention has been made in view of the above circumstances, and an object thereof is to use an information storage medium without using a clamper which is an obstacle to thinning, weight reduction, cost reduction, and the like. It can be mounted easily and securely regardless of the thickness,
Moreover, it is intended to provide an information processing device capable of stable information processing.

[Means for solving problems]

In order to solve the above problems, the present invention provides an information processing device in which an information storage medium is magnetically mounted on a turntable by a magnetic circuit housed in a recess of the turntable and rotationally driven. Has a convex portion whose thickness is set to be small with respect to the substrate of the information storage medium which has a recording layer on the opposite surface and has a recording layer on the opposite surface, and the convex portion is fitted into the opening of the substrate. A member to be attracted to the turntable side that is magnetically attracted to the turntable side, and the turntable is larger than the outer diameter of the member to be attracted. The inside diameter of the recess is set, and the member to be attracted is accommodated when the information storage medium is mounted on the turntable, and the magnetic circuit further accommodates the member to be attracted. This tar A yoke provided on the bottom of the recess of the table and having a rising portion along the inside or outside of the side of the recess, and a magnet provided on the bottom of the yoke with a gap from the rising portion of the yoke. And the member to be attracted is arranged so as to face both the yoke and the magnet.

[Action]

That is, according to the present invention, since the information storage medium can be magnetically attached to the turntable by the above-mentioned configuration, it is possible to reduce the thickness, weight, cost, etc. of the device conventionally required. It is possible to eliminate the obstruction of the clamper. Further, since the outer diameter of the member to be attracted is smaller than the inner diameter of the concave portion provided in the turntable for fixing the information storage medium, the member to be attracted does not hit the turntable and the turntable and the information storage medium are separated from each other. Direct contact can be made, and touch in the direction perpendicular to the surface of the information storage medium can be minimized, and stable information processing can be performed.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In FIG. 1, reference numeral 1 denotes an information storage medium (hereinafter referred to as a disc) housed in a cartridge 2, and the disc 1 is inserted together with the cartridge 2 into a medium insertion / ejection opening formed in a main body (not shown) of an information processing apparatus. It has become so.

The disc 1 inserted together with the cartridge 2 is automatically taken into a predetermined position and in a horizontal state by a medium taking-in / mounting mechanism (not shown), and at this time, the cartridge 2 exposes a part of the disc 1. The center of rotation is open. After that, the cartridge 2 is displaced in the surface direction, and the disc 1 is automatically mounted on the turntable 4 of the medium driving means 3.

The disc 1 comprises two substrates 6 each having an information recording layer 5,
6 is adhered with an inner spacer 7 and an outer spacer (not shown) sandwiched so that the information recording layers 5 and 5 are on the inner side, and magnetically attracted to both sides of the inner diameter portion (magnetic material). ) As a metal member (hereinafter referred to as a hub) 8,8 is attached.

The substrates 6, 6 are made of injection-molded transparent plastic plates, and are adhered to the inner spacer 7 and the outer spacer via an ultraviolet curable adhesive.

The hub 8 has a shape having a central hole 10 that fits with the centering portion 9a of the rotary shaft 9 of the medium driving means 3.
The substrates 6 and 6 are bonded to each other with an adhesive that does not adversely affect the substrates 6 and 6, for example, an epoxy adhesive.

Further, the hub 8 is formed with a convex portion 8 a, and the outer diameter portion of the hub 8 is fitted to the inner diameter portion 6 a of the substrate 6 so as to be positioned with respect to the substrate 6.

The inner diameter portion 6a of the substrate 6 is precisely formed coaxially with the recording / reproducing pregroup (not shown) formed on the substrate 6, and the outer diameter portion of the convex portion 8a of the hub 8 and the hub 8 are formed. The center hole 10 is precisely processed coaxially, so that the center of the pregroup and the rotation axis of the rotation shaft 9 can be aligned with each other. Further, it is possible to prevent problems such as a decrease in recording / reproducing accuracy and an increase in access time caused by the eccentricity.

The medium driving means 3 is an outer rotor type brushless DC motor having a motor shaft as the rotating shaft 9.
11 and a turntable 4 attached to a rotary shaft 9 of the motor 11.

The turntable 4 is made of a non-magnetic metal material, and a recess 4a is formed on the upper surface side thereof. A magnetic circuit forming member 14 including a magnet 12 for magnetically attracting the center hub 8 of the information storage medium 1 and a yoke 13 is housed in the recess 4a. This is to fully exert the force for mounting the disk 1 on the turntable 4 and to prevent the leakage of the magnetic field to the outside.

The outer diameter D _{1 of the} hub 8 is smaller than the inner diameter D _{2 of the} recess 4a formed on the upper surface of the turntable 4, and as shown in FIG. When the disk 1 is mounted in a state where the disk 1 is fitted into the positioning portion 9a of the rotary shaft 9, the hub 8 is housed in the recess 4a. The substrate 6 having the information recording layer 5 of the disc 1 is brought into direct contact with the annular table surface 4b on the outer side of the turntable 4.

Then, the substrate 6 having the information recording layer 5 of the disc 1 is surely pressed against the turntable 4 so that the shake in the direction perpendicular to the surface of the substrate 6 is minimized, whereby stable information recording is achieved. It has a structure that allows reproduction.

If the hub 8 and the table surface 4b of the turntable 4 are in contact with each other, it is necessary to make the parallelism between the surface of the hub 8 and the surface of the substrate 6 extremely accurate, and the swing of the disk 1 may occur. Since it becomes large, the thickness of the hub 8 and the thickness of the adhesive must be made uniform, which is an extremely difficult work.

On the other hand, the length of the centering portion 9a of the rotary shaft 9 of the medium driving means 3 is limited to the length that fits only with the central hole 10 of the hub 8 on the turntable 4 side. 8, central hole 10,
It is configured so that the coaxiality of 10 does not matter so much.

In addition, making the inner diameters of the two substrates 6, 6 and the center holes 10, 10 of the two hubs 8, 8 coaxial is a difficult task, and the length of the centering portion 9a is longer than necessary. If it is too long, it will take a long time to be mounted on the turntable 4, and in addition, it will cause a problem in terms of wear.

Further, since the magnetic circuit is formed in the concave portion 4a of the turntable 4, magnetic leakage to the outside is minimized, so that magnetic powder such as iron powder adheres to the rotating shaft 9. The hub 8 can be prevented from being improperly fitted.

Further, a proper gap G is formed between the magnet 12 and the yoke 13 housed in the concave portion 4a of the turntable 4 and the hub 8 so that the substrate 6 of the disk 1 and the table surface 4b come into direct contact with each other. Has become. In addition, the gap G
Means to reliably transmit the driving force of the turntable 4 to the disc 1 and, moreover, to the cartridge 2 accommodating the disc 1
This is because the disc 1 is mounted with an appropriate suction force (mounting force) with which the disc 1 can be easily taken out from the turntable 4 only by raising.

Reference numeral 15 shown in FIG. 1 is a motor mounting frame of the medium driving means 3, and 16 is a control board for controlling the driving of the motor 11.

Reference numeral 17 shown in FIG. 2 is a head that moves in the radial direction of the disk 1 by a head moving means such as a linear motor (not shown), and is a lower surface side substrate of the information storage medium 1 that is mounted and driven by the medium driving means 3. Information processing such as recording or reproducing is performed on the information recording layer 5 formed in 6.

In the above-described embodiment, the yoke 13 of the magnetic circuit forming member 14 housed in the recess 4a of the turntable 4 for magnetically attracting the information storage medium of the present invention is erected on both the inner diameter portion and the outer diameter portion. Although the structure having the upper portions 13a and 13b has been described, the present invention is not limited to this, and may have a rising portion 13a only in the inner diameter portion as shown in FIG. As shown in Fig. 4, only the outer diameter part has a rising part 13
It may have b.

Further, the hub 8 as a member to be attracted attached to the center of rotation of the disk 1 is not limited to the shaving process, but may be a press process as shown in FIG. 4, for example.

In the description of the other embodiments (FIGS. 3 and 4) described above, the same parts as those in the above-described embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

〔The invention's effect〕

As described above, according to the present invention, the information storage medium can be magnetically attached to the turntable by suction, which causes obstacles such as thinning, weight reduction, and cost reduction of the device conventionally required. It is possible to eliminate the need for the clamper.

Further, since the outer diameter of the member to be attracted is smaller than the inner diameter of the recess provided in the turntable that fixes the information storage medium,
The attracted member does not hit the turntable, the turntable and the information storage medium can be brought into direct contact with each other, and the touch in the direction perpendicular to the surface of the information storage medium can be minimized to enable stable information processing.

Further, since the member to be attracted has a convex portion set to be smaller than the thickness of the substrate, and the convex portion is fitted into the opening of the substrate, the finish condition caused by the molding condition of the substrate is poor. By making it possible to fit only good parts, not parts, it is easy to obtain good eccentricity accuracy.
Stable information processing is possible without eccentricity.

Further, the magnetic circuit is composed of a yoke and a magnet provided with a gap with respect to the rising portion of the yoke, and the attracted member is opposed to the yoke and the magnet across both of them. Since it is configured, the magnetic flux formed in the gap portion passes through the portion of the attracted member, a stronger magnetic attractive force acts on the attracted member, and the information storage medium is held in a stable state. There is an effect that it becomes possible.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention.
FIG. 1 is a schematic configuration explanatory view showing a partially cross-section of an information storage medium in an unmounted state, FIG. 2 is a schematic sectional view showing a state in which an information storage medium is mounted, and FIGS. 3 and 4 are FIG. 5 is a schematic cross-sectional view showing another embodiment in which the mounting states are different from each other.
FIG. 6 and FIG. 6 are schematic sectional views showing a mounted state of a conventional example. 1 ... Information storage medium (disk), 4 ... Turntable, 4a ... Recess, 8 ... Member to be attracted (hub), 10 ... Central hole, 14 ... Magnetic circuit forming member.

Claims (1)

[Claims] 1. An information processing apparatus in which an information storage medium is magnetically mounted on a turntable by a magnetic circuit housed in a concave portion of the turntable and is rotationally driven. With respect to the substrate of the information storage medium having the recording layer on the opposite surface, a convex portion having a small thickness is provided, and the convex portion is fitted into the opening of the substrate, so that The turntable has an attracted member that is magnetically attracted to the turntable side, and the turntable has an inner diameter of the recess set to be larger than an outer diameter of the attracted member. When the information storage medium is mounted on the turntable, the attracted member is housed, and the magnetic circuit has a bottom portion of a recess of the turntable in which the attracted member is housed. The yoke is provided and has a rising portion along the inside or outside of the side of the recess, and a magnet provided at the bottom of the yoke with a gap from the rising portion of the yoke. An information processing device, wherein a member is configured to face both the yoke and the magnet so as to face each other.