JPH087966B2 - Information storage medium - Google Patents

Description

The present invention relates to an information storage medium such as an optical disk, and in particular, it is mounted on a turntable accommodating a magnetic forming member and is rotationally driven. The present invention relates to an improvement of an information recording medium provided with a magnetically attracted member on the turntable side.

(Prior Art) In recent years, an information processing device using an optical disk as a storage medium is
The amount of information stored in a magnetic information processing device that has been widely used in the past can be greatly increased, a very good and stable information reproduction state with less noise can be obtained, and it is not affected by external influences. The memory state is difficult and the storage state is extremely stable, and further, 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.

Further, along with the trend of increasing usage, there has recently been a demand for thinning, weight reduction, and cost reduction of this type of information processing apparatus, and as a response to this, recently, an information storage medium is provided via a clamper. A magnetic attraction method of magnetically attracting an information storage medium to a turntable has been put into practical use instead of the conventional mechanical holding method (clamp method) of holding the turntable.

In this conventional magnet attraction method, an attracting member such as an annular iron plate is adhered to a substrate of an information recording medium by using an adhesive such as epoxy, and a turntable containing a magnetic forming member such as a magnet is magnetically attached. It is configured to be sucked into.

(Problems to be Solved by the Invention) However, conventionally, the member to be attracted is adhered by using an adhesive such as an epoxy-based material, and therefore, it must be left for several hours in a state where the adhesive is applied and pressed. However, the productivity was extremely poor, which was an obstacle to mass production.

The present invention has been made based on the above circumstances, and an object of the present invention is to provide an information storage medium with good productivity, which can attach a member to be attracted to a substrate in a short time.

[Structure of the Invention] (Means for Solving Problems) In order to solve the above problems, the present invention provides a turntable fitted to a rotary shaft of a rotary drive means and attached to the rotary shaft. In an information storage medium that is magnetically attracted by a magnetic forming member provided and is rotated while being supported by a turntable, a substrate having a central hole and a member to be attracted provided near the central hole of the substrate. A centering member made of an ultraviolet permeable material that has a rotation center hole fitted to the rotation shaft in a central portion and is adhered to the substrate using an ultraviolet curing adhesive, A magnetic member that is magnetically attracted by the magnetic forming member and a locking unit that locks the magnetic member and the centering member are provided.

(Operation) That is, according to the present invention, the attracted member that is magnetically attracted to the turntable side is a centering member made of an ultraviolet ray permeable material, and a magnetic member attached to the centering member via an engaging means. Since the centering member is adhered using an ultraviolet-curable adhesive and the magnetic member is attached via the engaging means, the adhesive is adhered using an epoxy adhesive or the like as in the past. Compared with the case, the time required for mounting can be shortened, and the productivity can be greatly improved.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 3, reference numeral 1 denotes an information recording medium housed in a cartridge 2, and this information storage medium 1 is designed to be inserted together with the cartridge 2 into a medium insertion / ejection opening formed in an information processing apparatus.

The information recording medium 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). The center of rotation is opened so that it is exposed. Then, after this, the cartridge 2 is displaced in the plane direction, and the information storage medium 1 is moved to the medium drive means 3.
The turntable 4 is automatically attached.

In the above information storage medium, two substrates 6 and 6 having an information recording layer 5 are adhered by sandwiching the inner spacer 7 and the outer spacer 8 so that the information recording layers 5 and 5 are on the inner side, and the inner diameter portion thereof. To be attracted to both sides of the magnetically
It has a configuration with 9,9 attached.

The substrates 6 and 6 are made of an injection-molded transparent plastic plate, and include the inner spacer 7 and the outer spacer 8.
And UV-curable adhesive.

Further, as shown in FIG. 4, the sucked member 9 is
The centering member 20 and the magnetic member 21 attached to the centering member 20 are provided.

The centering member 20 is made of the same material as the substrate 6 and has a good ultraviolet transmittance. Also, the centering member 20
Has a central hole 11 which is fitted to the center of rotation of the substrate 6 as will be described later and fits with the centering portion 10a of the rotation shaft 10 of the medium driving means 3. It is precisely molded coaxially with the formed recording / playback pre-groove (not shown), and it is possible to prevent problems such as reduced recording / playback accuracy and increased access time caused by eccentricity. ing.

Further, the magnetic member 21 is formed from a metal plate into a disc shape having a through hole 21a in the central portion, and is fitted into the annular recess 20b formed on the upper surface of the centering member 20 to be slightly larger than this. The substrate 6 is in an embedded state and via a mounting means 22 described later.
Is constrained to move in a direction perpendicular to the surface of the substrate 6 and is attached so as to be slightly movable in a direction parallel to the surface of the substrate 6.

The mounting means 22 is a centering member as shown in FIG.
Three locked portions 23 formed in the same central circle at equal intervals in the ring 20, and a locked portion 23 in the magnetic member 21 for engaging these locked portions 23. The locking claws 24 are formed so as to have the same positional relationship.

The locked portion 23 has a claw insertion hole 23a formed to have a size capable of inserting the locking claw 24 and a slit portion 23b formed in a state of communicating therewith, and the slit portion 2
A return preventing protrusion 23c is formed on the lower surface of one side edge of 3b.

On the other hand, the locking claw 24 is a cut and raised tongue piece bent in an L shape.
21a.

Next, the procedure for attaching the attracted member 9 including the centering member 20 and the magnetic member 21 will be described with reference to FIGS. 1 and 2.

First, as shown in FIG. 1 (a), the substrates 6 and 6 are polymerized on both sides of the spacers 7 and 8 in a state in which the ultraviolet curing adhesive 30 is applied. The centering members 20, 20 coated with the curable adhesive 30 are polymerized. Then, as shown in FIG. 1 (b) and FIG.
For example, the pressing plates 31 and 31 made of an ultraviolet transmitting material such as glass are polymerized, and these are screwed into the screws 32 and the nuts 33 and 33.
The fixing tool 34 consisting of is tightened from both sides. Then, after that, it is put in an ultraviolet irradiation device (not shown) and irradiated with ultraviolet rays 35 to cure the ultraviolet curable adhesive 30, so that the both substrates 6, 6, the spacers 7, 8 and the centering members 20, 20 are removed. Integrate.

After this, take it out from the ultraviolet irradiation device and press it down.
Remove the state shown in FIG. 1 (c), and then
As shown in FIG. 3D, the magnetic members 21, 21 are attached to the centering members 20, 20.
And the information storage medium 1 is completed.

The attachment of the magnetic members 21, 21 is performed as follows. That is, the locking claw 24 formed on the magnetic member 21.
Is inserted into the claw insertion hole 23a of the centering member 20, and then the magnetic member 21 is rotated clockwise in the state of FIG. 4 so that the vertical portion 24a of the locking claw 24 is interposed in the slit portion 23b. By doing so, the horizontal portion 24b is locked to the lower surface of the one side edge of the slit portion 23b. At this time, the horizontal portion 24b of the locking claw 24 is elastically deformed to get over the return prevention projection 23c formed on the lower surface of one side of the slit portion 23b,
Even if an attempt is made to return in the direction of the claw insertion hole 23a, the prevention projection 23c does not interfere and return.

In this way, in the magnetic member 21 attached to the centering member 20, the horizontal portion 24b of each locking claw 24 ...
By locking to the lower surface of the side edge, the movement in the direction perpendicular to the surface of the substrate 6 is restrained, and only the gap formed between the slit portion 23b and the vertical portion 24a in the direction parallel to the surface of the substrate is small. You can move to.

The medium driving means 3 has a configuration including an outer rotor type brushless DC motor 12 having a motor shaft as the rotary shaft 10 and a turntable 4 attached to the rotary shaft 10 of the motor 12. ing. The turntable 4 is made of a non-magnetic metal material, and a recess is formed on the upper surface side thereof. A magnet forming member 15 including a magnet 13 and a yoke 14 for magnetically attracting the attracted member 9 of the information storage medium 1 is accommodated in the recess.

Incidentally, 16 shown in FIG. 3 is a motor mounting frame of the medium driving means 3, and 17 is a control board for controlling the driving of the motor 12. Reference numeral 18 denotes a head which is moved in the radial direction of the information storage medium 1 by a head moving means such as a linear motor (not shown), which is mounted on the medium driving means 3 and driven to be formed on the lower surface side substrate 6 of the information storage medium 1. Information processing such as recording or reproducing on the recorded information recording layer 5 is performed.

Then, the attracted member 9 provided at the center of the substrate 6
A centering member 20 having a center hole 11 as a center of rotation in the center, and a magnetic member 21 attached to the centering member 20.
Therefore, even if the substrate 6 and the magnetic member 21 are affected by heat due to a change in external temperature, the influence of the difference in thermal expansion coefficient between the substrate 6 and the magnetic member 21 can be absorbed in this portion, and the substrate 6 is distorted. Therefore, stable information processing can be performed.

In addition, the centering member 20 is made of an ultraviolet ray transmissive material and is adhered by using an ultraviolet curable adhesive 30.
Since 21 is attached, the time required for attachment can be much shortened and productivity can be significantly improved as compared with the case of attaching using an adhesive such as an epoxy as in the past. In addition, the same adhesive as that for bonding the substrate 6 and the spacers 7 and 8 can be used, and since it is possible to bond them at the same time using the same ultraviolet irradiation device, workability can be greatly improved.

Although the information storage medium having a structure having two substrates has been described in the above-described embodiment, the present invention is not limited to this and may be applied to a substrate having one substrate. Further, the magnetic member is provided with the locking claws, and the locking claws are engaged with the engaged portions formed on the centering member for mounting, but the present invention is not limited to this, and other mounting means. Of course, for example, a flat magnetic member may be attached with an adhesive.

In addition, it goes without saying that the present invention can be variously modified and implemented within the scope of the invention.

[Effects of the Invention] As described above, according to the present invention, it is possible to provide an information storage medium with high productivity that can attach a member to be attracted to a substrate in a short time.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is an explanatory view for schematically explaining a manufacturing process of an information storage medium, FIG. 2 is an enlarged sectional view showing the same main process part, and FIG. FIG. 4 is an explanatory view showing a state in which the information storage medium is mounted on the turntable, and FIG. 4 is an exploded perspective view showing a mounting means of a magnetic member and a centering member that constitutes a main part and a member to be attracted. 1 ... information storage medium, 4 ... turntable, 6 ... substrate, 9 ... attracted member, 11 ... central hole, 15 ... magnetic forming member, 20 ... centering member, 21 ... magnetic member , 30 …… UV curable adhesive.

Claims (1)

[Claims] 1. A rotary drive means is fitted to a rotary shaft, and is magnetically attracted by a magnetic forming member provided on a turntable attached to the rotary shaft to rotate while being supported by the turntable. The information storage medium comprises a substrate having a central hole and a member to be attracted provided near the central hole of the substrate, and the member to be attracted has a rotation center hole in the center portion that is fitted with the rotation shaft. Along with the centering member made of an ultraviolet ray permeable material adhered to the substrate using an ultraviolet curable adhesive, a magnetic member magnetically attracted by the magnetic forming member, the magnetic member and the centering member. An information storage medium, comprising: locking means for locking.