JPH0792967B2 - Information processing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention drives an information storage medium such as an optical disk and records, reproduces, or erases information by using a laser beam or the like during its rotation. The present invention relates to improvement of 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. Configuration etc. are 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.

The present invention has been made in view of the above circumstances, and an object of the present invention is to use an information storage medium without using a clamper, which is an obstacle to thinning, weight reduction, and cost reduction. An object of the present invention is to provide an information processing device that can be reliably mounted regardless of the thickness.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides an information processing device that supports and rotates an information storage medium by a turntable and processes information on the information storage medium. And a magnet having 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. A circuit and a rotation center hole provided on both sides of the information storage medium and having a rotation center hole, both of the yoke and the magnet of the magnetic circuit when the information storage medium is supported by the turntable. An attracted member that is magnetically attracted to the turntable side by straddling and facing each other, and the rotation center of the attracted member on the turntable side of the attracted members Only engaged by a centering portion which is limited in length, in which the equipped to become a configuration and a rotating shaft that rotates integrally with the turntable.

[Action]

That is, according to the present invention, by adopting the above-mentioned configuration, the magnetic circuit forming member provided on the turntable can magnetically attract and mount the attracted member attached to the center of rotation of the information storage medium. It eliminates the need for a clamper, which has been required in the past, and enables thinning, weight reduction, and cost reduction.

〔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 mounted 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 a member to be attracted (magnetic material) that is magnetically attracted to both surfaces of the inner diameter portion thereof. ) 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 hub 8 of the information storage medium 1 and a yoke 13 is housed in the recess 4a. This is disk 1
This is for sufficiently exerting the force for attaching the to the turntable 4 and for preventing magnetic leakage to the outside.

The outer diameter of the hub 8 is smaller than the inner diameter of the recess 4a formed on the upper surface of the turntable 4. As shown in FIG. When the disc 1 is mounted in a state where it is fitted in the positioning portion 9a, the hub 8 is housed in the recess 4a. The substrate 6 having the information storage layer 5 of the disc 1 is an annular table surface outside the turntable 4.
It comes into direct contact with 4b.

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 attached to the turntable 4, and in addition, it will be a problem in terms of wear.

Further, since the magnetic circuit is formed in the concave portion 4a of the turntable 4, the magnetic leakage is reduced to the outside, so that powder of magnetic material 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 removed from the turntable 4 simply 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 is performed on the information recording layer 5 formed in 6.

In the embodiment described above, the yoke 13 of the magnetic circuit forming member 14 housed in the recess 4a of the turntable 4 has the rising portions 13a and 13b on both the inner diameter portion and the outer diameter portion. Not limited to this, it may have a rising portion 13a only in the inner diameter portion as shown in FIG.
As shown in the figure, it may have a rising portion 13b only on the outer diameter portion.

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 magnetic circuit forming member provided on the turntable can magnetically attract and mount the attracted member attached to the center of rotation of the information storage medium. The required clamper is not required, and it is possible to reduce the thickness, weight, and cost, and moreover, the information storage medium can be securely mounted regardless of its thickness.

In addition, the rotary shaft that rotates integrally with the turntable,
Since the centering portion is limited in length to fit only the attracted member on the turntable side among the attracted members, even the information storage medium in which the two substrates are not coaxial Alignment can be reliably performed, and good information processing can be performed.

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 the information storage medium is mounted, and FIGS. 3 and 4 are FIG. 5 and FIG. 6 are schematic cross-sectional views showing other different embodiments, and are schematic cross-sectional views showing a conventional example. 1 ... Information storage medium (disk), 3 ... Medium driving means, 4 ... Turntable, 4a ... Recessed portion, 6 ... Substrate,
8 …… Suction target (hub), 12 …… Magnet, 13 ……
Yoke, 14 ... Magnetic circuit forming member.

Claims (1)

[Claims] 1. An information processing apparatus for supporting and rotating an information storage medium by a turntable and processing information on the information storage medium, wherein the turntable is provided at the bottom of the recess, and the side portion of the recess is provided. A magnetic circuit composed of a yoke having a rising portion along the inside or outside and a magnet provided at the bottom of the yoke with a gap from the rising portion of the yoke, and the information storage medium. Provided on both sides of the rotation center portion, having a rotation center hole, and facing both the yoke and the magnet of the magnetic circuit when the information storage medium is supported by the turntable. A member to be attracted magnetically to the turntable side by a length, and a length to be fitted only to the rotation center hole of the member to be attracted on the turntable side of the member to be attracted. Restricted has a centering section, the information processing apparatus being characterized in that anda rotary shaft that rotates integrally with the turntable.