JPH01105327A - Production of disk type recording medium - Google Patents

Abstract

PURPOSE:To enable marking of identification codes in a short period of time so that the administration of the subsequent production processes by the identification codes can be made by marking the identification codes by a dot impact system to a disk recording medium while rotating the medium. CONSTITUTION:The disk 1 is imposed on either of imposing faces 11a, 11b and an air cylinder 13 is driven to lower a moving shaft 12 to press the imposing tray 11 by a tapered surface 12a and to expand the same toward the outside by which the disk 1 is fixed. A head arm 30 is then turned to move a head part 31 to a marking position A from a standby position B. While the disk 1 is rotationally driven by a rotational driving device 10, the head driving part is driven to control the pushing of the pin of a marking head by which the identification codes are marked to the nonrecording region.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a method of manufacturing a disk-type recording medium such as a magnetic disk.

(Prior Art) Conventionally, in the case of magnetic disks, which are examples of this type of disk-type recording medium, an identification code has been engraved on the disk plate as information for management and identification of operators in charge of manufacturing process management. Ta.

Conventionally, the identification code is stamped by an operator using a pen or the like, or by scratching it.

(Problems to be Solved by the Invention) According to the above-mentioned marking method, the worker uses a pen to perform the marking, which places a heavy burden on the worker and takes a lot of time to stamp the identification code. It required

Furthermore, since the shape and size of the fonts stamped vary depending on the operator, this type of identification code had to be read and deciphered by humans.

As described above, conventionally, it has been extremely difficult to machine read the identification code stamped on the disc plate, and the reliability has been poor for automatic identification using, for example, a television camera.

Another possible method for performing this type of marking is, for example, using a laser beam, but this type of laser equipment is extremely expensive and has the drawback of increasing equipment rental costs.

Therefore, an object of the present invention is to solve the above-mentioned conventional problems, to make it possible to imprint an identification code on a disk-type recording medium at low cost and in a short time, and to make it possible to imprint an identification code on a disk-type recording medium, which is extremely difficult to read by machine using a television camera or the like. Made possible with high reliability,
The object of the present invention is therefore to provide a method for manufacturing a disk-type recording medium in which, after the identification code is engraved, subsequent manufacturing steps can be managed using the identification code.

[Structure of the Invention] (Means for Solving the Problems) In the present invention, when manufacturing a metal disk-type recording medium, while rotating the disk-type recording medium, a non-recording area on the surface of the medium is An identification code is engraved using a dot impact method, and subsequent manufacturing processes for each disc type recording medium are managed by reading this identification code.

(Function) According to the present invention, since the identification code is stamped on the disk-shaped recording medium using the dot impact method while rotating the recording medium, it requires less work than the conventional manual method. It can significantly reduce the burden and can be executed in a short time.

In addition, since the dot impact method allows a pattern of a certain shape and size to be engraved, it is possible to perform mechanical reading using a television camera, etc., with extremely high reliability. This makes it possible to centrally manage the manufacturing process of disk-type recording media.

In addition, since the disk-shaped recording medium is rotated and engraved,
Since the structure of the dot impact head section can be simplified and there is no need to move the head section, the mechanism of the apparatus for implementing the method of the present invention can be simplified.

Furthermore, compared to marking with a laser beam, it can be carried out at a sufficiently low cost, so that there is no increase in equipment investment costs.

(Example) Hereinafter, an example in which the present invention is applied to a method for manufacturing a magnetic disk will be specifically described with reference to the drawings.

First, regarding the identification code stamping device used to carry out the main steps of the method for manufacturing a disk-type recording medium of this embodiment,
This will be explained with reference to FIG.

In the figure, this identification code stamping device includes a rotary drive device 10 that rotatably supports a disk plate 1, a print head 20 that stamps an identification code on the disk plate 1 by a dot impact method, and this print head 20. It is comprised of a head arm 30 that moves the mounted head section 21 between the marking position shown in FIG. 1A and the standby position shown in FIG.

As shown in detail in FIG. 2, the rotary drive device 10 includes:
The rotary mounting table 11 is provided with two stages of disk mounting surfaces 11a and llb corresponding to the inner diameter dimension of the donut-shaped disk plate 1, and has a notch 11c inside.

-5= A moving shaft 12 having a tapered surface 12a with a large diameter at the top and a small diameter at the bottom is arranged in the notch 11c of the mounting table 11, and the moving shaft 12 is moved up and down by an air cylinder 13. It is supported so that it can move freely. Note that air tubes 14 and 15 for supplying and discharging air are connected to the air cylinder 13.

Then, the above-mentioned mechanism drives the moving shaft 12, presses the notch 11c in contact with the tapered surface 12a of the moving shaft 12, pushes the disk mounting table 11 outward, and places the disk on the mounting table 11. The disc 1 can be fixed by pressing the inner edge of the disc 1 being placed.

Further, each of the above-mentioned mechanisms is mounted on the base 16 and configured to rotate integrally by a rotational drive mechanism (not shown), so that the disk 1 is rotationally driven. In the case of this embodiment, the rotational speed of the disk-type recording medium 1 is about 60 rpm.

The print head 20 has, for example, seven bins arranged in a row,
The bottle is pushed by the control of a head drive unit (not shown),
By forming a dot-shaped mark on the disk 1 by the pushed pin, and performing the above-mentioned mark while rotating the disk 1, an identification code based on the collection of the dots is formed on the disk 1. It is supposed to form a pattern. In this embodiment, patterns such as numbers and alphabets can be engraved.

Here, the identification code includes, for example, the serial number of the disc 1, the lot number, and the manufacturing date.

Time, vendor name, predetermined message, etc. can be listed, and other codes can be added or deleted depending on the content of management using this identification code.

The area in which the identification code is engraved is formed in a non-recording area S near the inner circumference of the donut-shaped disk plate 1, as shown in FIG.

The helad arm 30 is rotatable around a support shaft 31 provided on a support base 32, and when marking the disc 1, it is placed at the position A in the figure after the marking is completed. When waiting until setting 1, the head section 21 is moved to the standby position B in the figure.

Incidentally, the helad arm 30 is provided with a spacing adjustment tool 33 made of, for example, a screw mechanism, for adjusting the spacing between the disk plate 1 and the print head 20.

Further, the support stand 32 and the rotation support device 10 are fixed on the base 40, but the support stand 32 and the rotation support device 10 are fixed on the base 40.
is movable along the horizontal direction on the base 40,
Further, this amount of movement can be adjusted by a horizontal position adjuster 34 made of, for example, a screw mechanism.

Next, a method of manufacturing a disk, which is an embodiment of the present invention, using the apparatus of the embodiment described above will be explained with reference to FIG.

As shown in FIG. 4, an aluminum plate, which is the material of the disk plate 1, is punched out (step 1), and then lathed to form a donut shape (step 2).

Next, grindstone polishing is performed (step 3), and mirror polishing is performed using coating particles (step 4).

After this, please perform the first disk cleaning.
), plating with Ni-P, for example, to a plating thickness of about 15 μm to 20 μm (step 6), and performing coating polishing again (step 7).

Then, when the polishing with the coating particles is completed, the disk 1 is set in the above-mentioned identification code stamping device, and an identification code is stamped on the disk 1 (step 8).

Here, the disk 1 is placed on one of the mounting surfaces 11a and llb that have a donut-shaped inner diameter, and is moved down the moving shaft 12 by driving the air cylinder 13. The mounting table 11 is expanded outward by being pushed by the tapered surface 12a by the downward movement, and this movement presses and fixes the donut-shaped inner periphery by the mounting table 11, and the disk 1 is placed and fixed on the mounting table 11. is completed.

Thereafter, the head part 31 is moved from the standby position B to the marking position A in FIG. 1 by rotating the head arm 30, and while rotating the disk 1, the head driving part (not shown) is driven to print. By controlling the pushing movement of the 7 pins of the head 20, marking of the identification code on the non-recording area S shown in FIG. 3 is completed.

Here, the engraving depth is, for example, about 1 μm, and since the engraving is performed by a dot impact method, various identification patterns can be formed in a predetermined shape and size.

After this, perform the second disk cleaning step 9)
, a texturing process is performed in which taping is performed to a thickness of, for example, several microns (step 10), and then a third disk cleaning is performed (step 11).

Finally, a magnetic material is formed on the disk plate by sputtering (step 12), and the process moves on to the subsequent inspection process (step 13).

After stamping the identification code in step 8, each manufacturing process from step 9 onwards sells the identification code, for example, using a television camera, and inputs this into a computer to automate the identification and management of the manufacturing process. That's what I do.

Here, when the disc 1 is read by the television camera, the entire surface of the disc 1 is polished to a mirror finish, but the part on which the identification code is engraved is distorted.

Therefore, the reflectance is different from that of the region other than the region S in FIG. 3, and the portion engraved by the dot impact can be easily distinguished. Furthermore, since the stamp is engraved in a predetermined shape and size using the dot impact method, the reliability of machine reading is significantly improved compared to conventional manual marking, and the identification code can be read and processes using this identification code can be easily performed. It is possible to put automatic management into practical use.

Here, the content of process control using this type of identification code is as follows: First, each time each process from step 9 onwards is carried out, the identification code is mechanically read and the completion of the process is registered in the computer. te-11= There is a lot of work to be done, and this makes it possible to centrally manage the progress of manufacturing the disk-type recording medium 1 and the number of units manufactured.

Furthermore, if the defect content is determined in the inspection process in step 13, the defect content may be registered in the computer in association with an identification code to manage whether or not a subsequent correction process is necessary.

In addition, in the case of this embodiment, it is possible to engrave about 360 disk-shaped recording media per hour, so faster processing is possible than in the past.

Note that the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the gist of the present invention.

For example, the engraving process in the above embodiment was performed after the coating and polishing process, but since there is a plating process in manufacturing this type of magnetic disk, care must be taken to prevent the engravings from being covered by the plating. The marking process can be selected and carried out as appropriate. In the case of the above-mentioned embodiment, other modifications can be made as appropriate, such as carrying out the process after the texturing process.

Further, the method of the present invention is not applied to a method of manufacturing a magnetic disk as in the above embodiments, but may be applied to any metal disk-shaped recording medium on which an identification code can be formed by engraving.

[Effects of the Invention] As explained above, according to the present invention, an identification code is engraved on a disc-shaped recording medium by a dot impact method while the disc-shaped recording medium is being rotated. Since mechanically readable markings can be made, it is possible to provide a method for manufacturing a disk-type recording medium in which subsequent manufacturing steps can be managed by reading this identification code.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing an example of an identification code stamping device for carrying out the main steps of the method of the present invention, FIG. 2 is a sectional view of a device that rotatably supports a disk-shaped recording medium, and FIG. 3 4 is a schematic explanatory diagram showing an identification code inscribed area on a disk-type recording medium, and FIG. 4 is a flowchart showing an example of the manufacturing process of a magnetic disk, which is an embodiment of the method of the present invention. DESCRIPTION OF SYMBOLS 1... Disk type recording medium, 10... Disk rotating device, 20... Print head, 30... Head arm, S... Identification code stamp area. Agent Patent Attorney Inoue - (1 other person) Figure 2 Collection 3 Figure 54F8

Claims (1)

[Claims] When manufacturing a metal disk-shaped recording medium, an identification code is engraved on a non-recording area on the surface of the medium by a dot impact method while rotating the disk-shaped recording medium, and this identification code is 1. A method for manufacturing a disk-type recording medium, characterized in that subsequent manufacturing steps for each disk-type recording medium are managed by reading.