JPS6310344A - Information recording medium and its manufacturing method - Google Patents

Abstract

PURPOSE:To improve the straightening performance of a straightening device for deformed optical card by giving previously the curvature to a card type information recording medium in the specific direction. CONSTITUTION:An optical card 30 is put on the outer circumference of a mounting stage 34 having a curvature radiuson its surface to be given to the card 30 and both end parts of the card 30 pressed by press rollers 35 and 36. Then the card 30 is heated for a prescribed time by a heating means. Then both rollers 35 and 36 are moved and the card 30 is removed from the stage 34. Thus the curved card 30 has the permanent plastic deformation. As the material of the card 30 has a comparatively firm stand, the card 30 can reset to its original curved shape after the load is removed even though it is once deformed mechanically in a normal application mode. Thus the correcting performance is satisfactorily improved with an optical card straightening device.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is used in an information recording/reproducing device that records information, reproduces information, or both by moving back and forth relative to a recording or reproducing head. The present invention relates to a cart-shaped information recording medium and its manufacturing method.

[Prior Art] Conventionally, there have been various forms of recording media used for recording information using a light beam and reproducing the recorded information using a light beam, such as a card shape, a disk shape, and a tape shape. are known. Among these, cart-shaped optical information recording media (hereinafter referred to as "optical cards")
) is expected to be in great demand as a recording medium that is easy to manufacture, portable, and easily accessible.

A conventional example of such an optical cart is shown in FIG.

As shown in the figure, the optical card 1 has a recording area 2 on its surface.
A large number of linear information tracks 3 are formed in parallel within this area.

As an information recording/reproducing apparatus for recording information on such an optical card, reproducing information, or both, an apparatus as shown in FIG. 6 has been used. The figure shows the main parts of the optical cart L and the information track 3.
It shows the feeding mechanism and its drive stage for reciprocating movement in the direction of. The fork cart 1 reciprocates in the direction of the information track 3 between a frame 14 acting as a first stage guide and a leaf spring 16 for biasing the optical card I toward the frame 14. A drive motor (not shown) is used as a drive means for reciprocating the optical card 1, and the rotation of the drive motor is transmitted to the pulley 20 via a belt 22.
A roller 18a connected to the pulley 20 is rotated. Another roller (not shown) is arranged in the vicinity of the roller 18a at a predetermined minute distance from the roller 18a, and the optical card 1 is sandwiched between these rollers.
It moves in the direction of arrow a-b according to the rotation of a. optical card l
An optical head 12 is provided near the plane -L, and this optical head 12 is movable in a direction perpendicular to the direction of the information trough 3 by a drive motor such as a Stella Pink motor (not shown). Therefore, the focused light beam spot irradiated from the optical head 12 is continuously moved relatively in the direction of the information track on the surface of the optical card 1, and information is recorded or reproduced at this time.

After the optical card 1 has moved a predetermined distance, the optical head 12 is moved a predetermined distance relatively in a direction transverse to the direction of the information track 3, and then again relatively continuously in the direction of the information track 3. Then, the information is recorded or reproduced again. In this way, predetermined information is recorded or reproduced while repeating the above-described operations.

Therefore, as can be understood from the above, it is desirable for the relative distance of the optical card l to the optical head 12 to be always kept constant in order to perform good focusing control and tracking control. be.

However, since optical cards are generally made of flexible materials such as polycarbonate, vinyl chloride resin, acrylic resin, etc., they may be exposed to various mechanical pressures or heat during use, for example during storage. After long-term use, the optical cart inevitably becomes warped or wavy. Also, such deformation may occur during manufacturing.

Incidentally, various aspects of the optical card deformed as described above are shown in FIGS. 5(a) to 5(d).

FIG. 5(a) shows the case where the optical card l is warped in the long side direction, and FIG. ) shows a case where the optical card l is warped in the direction of the short side, and FIG. 5(d) shows a case where the warp occurs in the opposite state from that shown in FIG. 5(c).

When recording and reproducing information using such a modified optical card, various inconveniences occur.

This is because the irradiation angle of the light beam irradiated from the optical head to the optical card is not kept constant, and during focusing control or tracking control, a focus error signal is generated for such an optical card. Alternatively, it is difficult to accurately detect a tracking error signal, and errors are likely to occur in recording and reproducing information.

Of course, it is preferable to discard an optical card that has been extremely deformed, but in reality, it is desirable to correct an optical card that has been relatively slightly deformed before use.

As a device for performing such correction, for example, a device that corrects the warpage by pressing an optical cart that has some kind of warp with a rod-shaped member biased by a spring, or a device that corrects the warp by pressing an optical cart that has some kind of warp with a rod-shaped member biased by a spring, or A device has been proposed in which an entrance opening having a wide gap is provided, and an optical card is inserted through this opening to correct the warpage.

However, in all of these devices, a correcting means is appropriately provided in a direction transverse to the moving direction of the deformed optical card, and the optical cart is moved in a predetermined direction, and the optical card is pressed by the correcting means to remove the optical card. Although the relative distance of the optical card surface to the head is kept constant, there is a problem that the correction by the correction means may not be sufficient depending on the degree of deformation of the optical card. In the above example, there is a problem in that the load on the drive motor, which is the drive source for placing the card on the card mounting table (shuttle) equipped with a card pressing means, increases due to the inertial mass of the shuttle.

As a device that solves this problem, a device as shown in No. 71'j4 has already been filed by the present applicant (
Patent application Sho 6l-017837). The figure shows a schematic side view of the device.

In FIG. 7, 5a, 5b, and 5c are drive rollers, and 6a, 6b, and 6c are suppression rollers arranged above the drive rollers, respectively. Also, 50.51
are auxiliary rollers arranged on both sides of the drive roller 5b in the direction of arrow B. These auxiliary rollers 50, 51 are positioned such that their upper ends are higher than the upper end of the drive roller 5b. The difference in height from the top end position is made smaller than the thickness of the optical card l. Reference numeral 4 denotes an optical head, which is located at a position corresponding to the driving roller 5b and the pressing roller 6b.

In a device configured in this way, first the optical card l
is inserted between the drive roller 5a and the pressure roller 6b,
Drive [1-Driven and fed by roller 5b, driven by auxiliary roller 50-L, driven roller 5C and pressing roller 6
Approach near C. Next, the optical cart 1 is driven further forward by the drive roller 5b, and when its tip reaches the auxiliary roller 51, the auxiliary roller 50,
Since the -L end of 51 is located above the upper end of the drive roller 6b, the optical card l is pressed in the vertical direction by the auxiliary rollers 50, 51 and the pressing roller 5b, respectively, so that it curves downward in a convex manner. is forced to transform.

In this device, the optical card 1 is curved only in the direction of arrow B, that is, along the direction of movement of the optical card 1, and almost never in the direction perpendicular to the direction of movement.

According to this device, even if the optical cart 1 is deformed into an arbitrary shape, the auxiliary rollers 50 and 5 are
In the case of plate 1, the deformation is corrected and the optical card 1 is made into a constant shape by the forced deformation. As a result, the optical card l of the optical beam spot irradiated from the optical head 4
The irradiation angle is always kept constant, that is, always at right angles, which is an ideal state especially during the force sink control.

[Problems to be Solved by the Invention] By the way, when optical carts with various modifications as shown in FIG. 5 are applied to the above device, the problems shown in FIGS. 5(a) and (h) Regarding the Tahikari cart.

” - The device effectively forces the deformation. However,
Regarding the optical cards shown in FIGS. 5(c) and (d), compared to the optical cards shown in FIGS. 5(a) and (b), when the forcible deformation is performed, The power to resist becomes greater. This is ``2, Figure 5 (C) and (
This is due to the deformation situation of the optical cart 1 in d), that is, the optical card l in 5 [ ] (C) and (d) is
This is because the optical cards 1 in a) and (b) are different in their deformation situation, and are deformed in a direction perpendicular to the moving direction of the optical card 1 in the apparatus shown in FIG. When the optical cards shown in FIGS. 5(c) and 5(d) are applied to the device, as described above, the force acting against the driving roller 5b and the pressing roller 6b (see FIG. 7) becomes large. For this reason, the load applied to the drive motor of the drive roller 6b becomes large, or the desired forced deformation is not achieved, and therefore, the device for forcing bipedal deformation does not exhibit its initial effect. become.

The present invention has been made in view of the above circumstances, and is an early stage of a recording device for recording and reproducing information in an ideal and stable manner. An object of the present invention is to provide a card-shaped information recording medium that can fully exhibit the effects of.

[Means for Solving the Problems] The problem with the prior art described above is that the information recording and/or reproducing head of the present invention is moved relative to the information recording and/or reproducing head. An information recording medium in the form of a flexible card, which is characterized in that it is curved in a specific direction in advance, and a card formed of a flexible material. The problem is solved by a method of manufacturing an information recording medium having a shape that includes a step of providing a curve in a specific direction to the medium.

[Examples] Examples of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view of the information recording medium of this embodiment, and FIGS. 2 and 3 are diagrams for explaining the manufacturing method thereof.

Note that an optical card will be described as the information recording medium of this embodiment.

As shown in FIG. 1(a), the optical cart 30 of this embodiment has a recording area 34 and an information track 35 similar to those of a conventional optical card, and a front layer 31 and a back layer 32 have flexibility. The recording layer 33 is formed mainly of, for example, polycarbonate or hard vinyl chloride resin, and a recording layer 33 is provided in the center layer. These layers are adhered to each other by the manufacturing method described below, and have a thickness of 0.76 m.
It is said to be about m.

l The optical cart 30 having such a thickness is produced by a manufacturing method described later to have a length f as shown in FIG. 1(b).

It is curved in the direction of the information track 35 . If the optical card 30 is bent into a curved shape in this way, these materials are quite strong, so even if they are mechanically deformed during normal use, they will return to their original shape after the load is removed. The curved shape is restored. Therefore, the optical card 30 bent into a curved shape of this embodiment is
Under normal usage conditions, the
) to (d), no deformation occurs in the short side direction.

The amount of deformation of the optical card 30 that should be given at the time of manufacture is shown as being considerably distorted in FIG. The general external dimensions of the card are 85 - x 54
If it is about the size of ■■, the maximum deflection amount is 2■
It is desirable that the amount of bending be approximately the same. Further, if the amount of bending is within this range, the portability of the optical card will not be impaired.

The operation when such an optical cart 3o is applied to the information recording/reproducing apparatus shown in FIG. 7 will be explained with reference to the same figure.

] - The device shown in Fig. 7 has auxiliary rollers 50° and 51
The upper end of the drive roller 5b is provided slightly below one end of the drive roller 5b, and a pressure roller 6b is provided so as to urge the optical card l moving in contact with the drive roller 5b toward the drive roller 5b. Therefore, the auxiliary rollers 5o and 51
The transport path of the optical cart l between the two has a downwardly curved surface, and the optical card 3o of this embodiment has a curved surface similar to the transport path. 30 is shown in FIG. 5(C) when the device is transferred between the driving roller 5b and the pressing roller 6b.

Compared to the optical card deformed as shown in (d), the load applied to the drive motor that rotates the drive roller 5b is much smaller. Moreover, when the optical card 30 of this embodiment is curved in the long side direction, the optical Deformation in the short side direction of the cart 30 is much less likely to occur. Therefore, the optical cart 30 of this embodiment can be expected to maintain its roughly curved shape under normal usage conditions. It is possible to make the most of the effects that it has.

Next, a method for manufacturing the above-mentioned optical card, and a method for curving the optical card in a specific direction will be described in detail.

FIG. 2 shows a first embodiment of the manufacturing method.

As described above, the optical card 3o has a recording layer as a central layer, the back surface of which is covered with a flexible material such as polycarbonate or hard vinyl chloride resin, and is bonded to each other, and has a predetermined external shape. It is pre-cut to size.

The optical card 30 made in this way is placed on the outer periphery of the mounting table 34 whose surface has a radius of curvature to be mapped to the optical cart 30, and both ends of the optical card 3o are held by pressing rollers 35, 3.
6. Press down.

After the optical cart 30 is brought into close contact with the outer peripheral surface of the mounting table 34 in this manner, it is heated for a predetermined period of time by a heating means (not shown).

After that, the presser rollers 35 and 36 are moved, and the optical cart 3
When the optical cart 3 is taken out from the mounting table 34, the optical cart 3 is permanently plastically deformed into a curved shape as shown in FIG. 1(b).
0 is obtained.

In such a manufacturing method, a heating means may be built into the mounting table 34 and the mounting table 34 may be heated directly.

Furthermore, a second embodiment of the optical card manufacturing method is shown in a third country.

In the same figure, numerals 35 and 36 are a front laminate material and a back laminate material respectively made of the above-mentioned polycarbonate or hard vinyl chloride resin, and the long ones are wound into a roll.

Numeral 22 is a material for forming the recording layer (hereinafter referred to as "recording material"), which is similarly long or wound into a roll. As shown in the figure, a recording material 37 is placed between both laminate materials 35 and 36. 38, 39
, 40 and 41 are feed rollers provided in the lower pair, respectively, and these feed rollers can be rotated in the direction of the arrow in the figure by a drive motor (not shown). Further, these feed rollers are allowed to rotate intermittently, and between the rollers configured in pairs, the laminate material 48 in which the recording material 37 and each laminate material 35, 36 are stacked, or the arrow A direction. feed roller 37
A brush 50.51 is provided between the back surface laminate material 35.36 in a roll shape and extends from the recording material 37 side toward each laminate material 35.36. Adhesive is arranged to be delivered through the illustrated conduit.

42.43 are upper and lower press members for pressurizing and bonding the back surface laminate material 35.36 and the recording material;
The lower press member 43 is installed in a fixed state, and only the upper press member 43 can move up and down in the direction of arrow B in synchronization with the intermittent movement of each of the rollers 38 to 41.

In addition, these two lower press members 42 and 43 are made of laminated material 48.
Corresponding curved surfaces are provided in each lower press member 42, 43 with the desired radius of curvature to be applied.

Reference numerals 44 and 45 designate cutters for cutting the laminated material 48 into predetermined dimensions, and are operable to cut the laminated material 48 into predetermined dimensions when the rollers 38 to 41 that move intermittently are at rest. Further, 46 is a belt for conveying the cut optical cart 30 to the next process, and the belt 46 is moved by the rotation of a drive roller 47.

The operation of this device will be explained. When the back surface laminate material 35° 36 and the recording material 37, which have been previously wound into rolls, are pulled out and inserted into a pair of feed rollers 38 and 39ii, and the rollers 38 are driven to rotate in the direction of the arrow in the figure, Each material is transferred in the six directions indicated by the arrows. Next, while each of the rollers 38 to 41 is intermittently rotated, the upper press member 42 is moved downward in synchronization with the intermittent rotation of these rollers 38 to 41 being stopped, so that the laminated material is 48 is pressurized.

On the other hand, adhesive is constantly supplied from brushes 50 and 51.
It is applied to the back surface laminate material 35,36.

In this way, each laminate material 35, 36 and recording material 37 are pressed by the upper and lower press members 42, 43.

While being firmly adhered to each other, they are further transported in the six directions of the arrows, and cut into predetermined dimensions by cutters 44 and 45.

``Since each of the laminate materials 35 and 36 and the recording material 37 are wound in the form of a staking roll,''
- A certain degree of curved surface is formed before being pressed by the lower press member 42.43, but the laminated material 48 is further formed to have a desired radius of curvature by the lower press member 42.43. .

In addition, if the adhesive used in the above device is an ultraviolet curable adhesive, if it is irradiated with ultraviolet rays while or after being pressurized with the lower press members 42 and 43,
It has the effect of shortening the curing time of the adhesive.

Although the above device is applied to an optical card as the information recording medium, it can also be applied to this type of manufacturing method for magnetic cards, and similarly to the above, it is possible to effectively form the card into a shape having a curved surface.

(Effects of the Invention) As explained above, according to the information recording medium and the manufacturing method thereof of the present invention, the functions of the apparatus shown in FIG. 7 can be fully exhibited. That is, the medium is always positioned at a constant relative distance below the head for recording or reproducing information, and it is possible to always accurately record and reproduce information. Furthermore, the load on the motor that is the drive source of the device can also be minimized.

[Brief explanation of the drawing]

FIG. 1(a) is a sectional view showing the structure of an information recording medium according to an embodiment of the present invention, FIG. 1(b) is a perspective view of the medium with a curve, and FIG. 2 is a manufacturing method of the present invention. 1st related to
3 is a schematic sectional view of the second embodiment, FIG. 4 is a top view of a conventional optical card, and FIG. 5(a)
4 is a perspective view showing a modified state of the optical card, FIG. 6 is a schematic plan view showing a conventional device for recording and reproducing information on an optical card, and FIG. 7 is a conventional device. FIG. 2 is a schematic side view of a device for applying stress deformation to a light cart; 30... Optical card, 34-... Storage stand, 35.36-
...Press roller, 42...Upper press member, 43...
・Lower press member.

Claims (2)

[Claims] (1) A flexible card-shaped information recording medium that can be used for recording and/or reproducing information by moving it relative to a head for recording and/or reproducing information, An information recording medium characterized by being curved in a specific direction in advance. (2) A method for manufacturing a card-shaped information recording medium formed of a flexible material, which includes a step of curving the medium in a specific direction.