JPH01301021A - End face cutting method and device for optical disc substrate - Google Patents

Abstract

PURPOSE:To improve the yield of molded product by blasting fine powder through a nozzle to the inner and outer circumferential end sections of an optical disc substrate while rotating thereby deburring the substrate thereafter removing the dust through supersonic cleaning. CONSTITUTION:A burred optical disc substrate 201 is contained in a protective jig 111 except the inner and outer circumferential end sections and rotated with high speed through a motor 101. Then fine powder 103 having hardness equal to or slightly lower than that of the substrate is blasted, by means of a compressor 102, through a nozzle 112 to the end face of the substrate in order to deburr the substrate 302. Dust produced from the substrate 201 and used powder 103 are collected through a dust collector 105 and a suction unit 104 into a collection box 107. Thereafter, the optical disc substrate 201 is contained together with the protective jig 111 in a cleaning tank 108 and subjected to supersonic cleaning though a supersonic vibrator 109. By such arrangement the substrate can be deburred when it is shaped thus improving the yield remarkably.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention provides a method and apparatus for processing an end face of an optical disk substrate,
In particular, the present invention relates to a method and apparatus for processing the end face of an optical disk substrate in a method and apparatus for manufacturing a sized optical disk medium used as a large-capacity storage medium for computers.

[Conventional technology]

There are no conventional optical disc substrate end face processing methods and apparatuses, and efforts to improve the end face shape of optical disc substrates have mainly relied on improving the molding method.

[Problem to be solved by the invention]

However, in the above-described conventional manufacturing process of an optical disk medium, a substrate is first formed, and then a recording film is formed. After further bonding, a hard coat is applied.

In the manufacturing process of such an optical disk medium, slight burrs are generated on the inner and outer peripheral end surfaces of the optical disk during molding of the substrate. As mentioned above, improvements have been made to molding methods to eliminate the occurrence of this flaking, but the current technology has not yet been able to completely eliminate it.

Such burrs formed on the inner and outer peripheries of the optical disk substrate are easily broken, and when the optical disk substrate is handled in each process after the film formation process, the broken objects adhere to the recording surface and become defects, resulting in a decrease in yield in the production of optical disk media. It was the cause.

Specifically, dust adhesion during film deposition not only reduces storage capacity because the film is not deposited on the adhered area, but if it is large, it can cause malfunctions of the focus servo and track servo, which is a serious drawback. .

Furthermore, the adhesion of dust at the bonded portion during bonding causes a significant decrease in bonding strength after bonding.

Furthermore, if there is dust adhering to the coated surface during hard coating, the coating will be thicker on that area than on other areas, creating a lens effect and causing errors during writing and reading.

Furthermore, in the case of hard coats, even if the edges do not become dust due to folding, the film thickness of the hard coat may decrease near the periphery, especially if the edges are curved toward the hard coat surface on the outer periphery. This caused the film to become thick and cause a lens effect.

As described above, the particles generated during molding directly or indirectly affect subsequent steps, causing a decrease in yield in the production of optical disk media. In addition, unlike ordinary garbage, such garbage is generated by itself, so it is a serious problem that cannot be addressed even by upgrading the clean room class.

In other words, the conventional method for removing pars from the end surface of an optical disk substrate has the disadvantage that it is not possible to improve the yield of manufacturing optical disk media.

[Means to solve the problem]

The method for processing the end face of an optical disk substrate of the present invention includes a processing step of spraying fine powder from a nozzle onto the inner and outer peripheral edges of the optical disk substrate while rotating the optical disk substrate, and removing dust generated by the blowing process. and a removal step of removing by ultrasonic cleaning.

Further, the end face processing apparatus for an optical disk substrate of the present invention includes means for protecting other parts of the optical disk substrate except for the inner and outer peripheral edges, a driving means for rotating the optical disk substrate, and a means for injecting fine powder from a nozzle. , consists of an ultrasonic cleaning tank.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram showing one embodiment of the present invention, and FIG. 2 is a schematic diagram showing an embodiment of the present invention.
FIG. 2 is a perspective view showing an example including the protective jig shown in the figure.

An optical disk substrate with cracks formed on the inner and outer circumferences after molding is held in a protection jig 110, which will be described in detail later, and an optical disk substrate 201 held in the protection jig 110 is rotated from a motor 101 via a transmission system. .

In the case of the optical disk substrate 201, it is particularly important to have uniformity in shape and weight over the entire circumference at the same radius, and from this point of view when considering uniformity during end face processing, it is desirable that the rotation speed be high.

A nozzle 111 for ejecting fine powder fluid is connected to a hump presser 102 for obtaining jetting pressure and a hopper 104 containing fine powder 103.

In the embodiment shown in FIG. 1, only one nozzle 111 is shown, but if two nozzles are provided, the inner and outer peripheral end faces can be processed simultaneously.

Further, the material of the powder 103 is usually PC (polycarbonate) or PMMA (
(Acrylic) is used, so a material with hardness comparable to or less than these materials should be used.
゛Powder material 103 and optical disk substrate 201 after edge processing
The generated garbage is collected into a collection box 107 through a dust collector 105 and a suction device 106.

In this way, by processing the end face while rotating the optical disc substrate 201, the above-mentioned pars can be removed over the entire circumference of the end face of the optical disc substrate 201, and a uniform processed surface can be obtained.

In this case, the amount of powder and granular material 103 sprayed from the nozzle 111,
The injection pressure, processing time, etc. are determined experimentally depending on the material of the optical disc substrate 201 and the degree of paring.

Next, as shown by the arrow in the figure, the cleaning tank 108. Ultrasonic transducer 109. The optical disk substrate 201 after polishing is subjected to ultrasonic cleaning using an ultrasonic cleaner including a power source 110.

Since optical disk media are usually manufactured in a clean room, the above-mentioned equipment is surrounded by partition walls and integrated, and various rooms are provided as necessary, such as an ejection chamber, a cleaning room, a preliminary room, etc. However, it is not particularly limited in the present invention.

Next, FIG. 2 shows an example of the protective jig used in the above-mentioned present invention.

The optical disk substrate 201 is sandwiched between upper and lower supports 202 and 203, and only the inner and outer peripheral end surfaces are exposed. The shapes of the upper and lower supports 202, 203 are convex with a constant width at the ends of the inner and outer peripheries toward the side that supports the optical disk substrate 201. Therefore, the group surface of the optical disk substrate 201 and the surface opposite to the groove area are provided with supports 202 and 20.
Not only does it not have direct contact with 3, it is isolated and protected from the outside.

The convex portion having a constant width may be an edge or an O-ring.

When performing the above-mentioned ultrasonic cleaning, in order to prevent the group surface from coming into direct contact with the cleaning liquid, it is effective to use an O-ring in this area and perform cleaning while the optical disc substrate 201 is held in the protective jig 111.

A central shaft 2'05° 207 is attached to the upper and lower supports 202, 203 via central shaft fixing arms 204, 206, respectively. The center shafts 205 and 207 serve as rotation axes for rotating the optical disc substrate 201, and are used for positioning the protection jig 111 and the optical disc substrate 201 by making them hollow to the same extent as the inner diameter of the disc.

Further, the upper and lower support plates 202 and 203 are fixed to each other by upper and lower support plate fixing arms 208 and 209 and screws 210.

The hollow portions of the central shafts 205 and 207 are also used when inserting the nozzle 111 for processing the inner peripheral end.

In this way, the protection jig 111 used in the present invention can process the end face while rotating the optical disc substrate 201, and can perform ultrasonic cleaning while protecting the group face.

〔Effect of the invention〕

The optical disc substrate end face processing method and apparatus of the present invention include:
While rotating the optical disk substrate while processing the end face, it also has a protective means that effectively protects the group, and ultrasonic cleaning makes it possible to remove debris during molding, greatly improving yield. There is.

[Brief explanation of the drawing]

FIG. 1 is a schematic view showing an embodiment of the optical disk medium end face processing apparatus of the present invention, and FIG. 2 is a perspective view including an example of the protection jig shown in FIG. 1. 101... Motor, 102... Compressor, 103... Powder, 104...
...Hopper, 105... Dust collector, 106...
...Suction device, 107... Collection box, 108.
...Cleaning tank, 109...Ultrasonic vibrator,
110...Power supply, 111...Protective jig, 112...Nozzle, 201...Optical disc substrate, 202°203...Support , 20
4,206... Central axis fixed arm, 205,207
... Central shaft, 208, 209 ... Support fixing arm, 210 ... Screw.゛Representative Patent Attorney Shinman Uchihara 10

Claims (1)

[Claims] 1. A processing step in which fine powder is sprayed from a nozzle onto the inner and outer edges of the optical disk substrate while rotating it, and a removal step in which dust generated in the processing step is removed by ultrasonic cleaning. A method for processing an end face of an optical disk substrate, the method comprising: 2. A protection means for protecting other parts of the optical disc substrate except for the inner and outer peripheral edges, a driving means for rotating the optical disc substrate, an injection means for injecting fine powder from a nozzle, and an ultrasonic cleaning tank. An optical disc edge processing device comprising: