JP2000057644A - Sticking disk and method for confirming component disk of sticking disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and easily confirm whether or not a component disk of a manufactured ticking disk is correct. SOLUTION: Patterns showing component disk information are recorded on a part excepting an information area on respective component disks 2, 3 along the circumferential direction, and the patterns of respective component disks 2, 3 are recorded respectively on the positions different in the circumferential direction, and the patterns are formed by an assembly of tracks arranging in the radial direction formed in the circumferential direction. Since the disk is irradiated by an inspection beam 44, and a reflection beam reflected from the patterns is received, and respective component disks 2, 3 are confirmed by a pattern recognition means, whether or not respective component disks of the sticking disk are correct is confirmed easily, and fully automatizing this confirmation process is also easy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bonded disk having a plurality of recording layers, which is formed by bonding a plurality of constituent disks each having a recording surface.

[0002]

2. Description of the Related Art In recent years, in the case of optical discs, which are high-density recording media, bonded discs having a plurality of recording layers by bonding a plurality of constituent discs each having a recording surface have appeared. Is being promoted. In such a bonded disk manufacturing factory, a large number of lots, for example, 20 to 100 per day, are manufactured, so that the constituent disks are 40 to 200.
There are various types, and precise production management is required so that wrong configuration disks are not bonded. In addition, whether or not the constituent disks of the manufactured disk are correct is determined by extracting a sample from each production lot and reproducing the sample.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object a laminated disk and a laminated disk which can easily and easily confirm whether or not the constituent disks of the manufactured laminated disk are correct. It is intended to provide a method of checking the configuration of a disk.

[0004]

According to the present invention, a plurality of constituent disks each having a recording surface are bonded together.
On each of the constituent disks, a pattern representing the constituent disk information is recorded along the circumferential direction in a portion other than the information area, and the pattern of each constituent disk is recorded at a different position in the radial direction, and the pattern of the bonded disk is recorded. The recorded portion has at least transparency enough to recognize the light irradiated and reflected on the pattern, and the pattern is formed by a set of tracks formed in the circumferential direction and arranged in the radial direction. It is a bonded disc.

[0005] The above-mentioned pattern may be any pattern as long as its contents can be recognized by the recognition means, and typical ones are bar codes and characters. The barcode is easily recognized by well-known barcode recognition means, and the characters are easily recognized by well-known character recognition means and human eyes. By using such recognition means, the contents of the constituent disks can be automatically recognized, and it can be confirmed whether or not the correct constituent disks are bonded.

The above-mentioned pattern is displayed by a set of tracks formed in the circumferential direction and arranged in the radial direction, and the tracks can be, for example, continuous pits (grooves).
The formation of such a track is the same as the recording method of the main information of the optical disk, and can be easily recorded when the main information is recorded on the glass substrate by the cutting machine.

The present invention also relates to a method for checking the structure of a bonded disk, wherein the bonded disk is irradiated with inspection light, reflected light reflected from the pattern is received, and each component is recognized by pattern recognition means. This is how to check the disk.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments. FIG. 1 is a schematic explanatory view of a laminated disc 1 of an embodiment, FIG. 2 is a plan view of the disc 1,
FIG. 3 is an explanatory diagram of a barcode as a pattern, FIG. 4 is an explanatory diagram of tracks constituting the barcode, FIG. 5 is an explanatory diagram of characters of the pattern, and FIG. is there.

The present invention relates to a bonded disk in which a plurality of constituent disks are bonded. The example shown in FIG. 1 is an optical disk in which two constituent disks are bonded. The disk 1 is formed by bonding the constituent disks 2 and 3 with an adhesive (adhesive layer 7) with their recording surfaces inside, and the recording surface of each of the constituent disks 2 and 3 has concentric or spiral tracks 4 formed thereon. They are formed at a predetermined pitch t (for example, 1.2 μm). Track 4 is a continuation of pits and lands, which are portions without pits, and information is recorded by the lengths of the pits and lands. Reflection films 5 and 6 are formed on the recording surfaces of the constituent disks 2 and 3 to reflect read light.
At least one of the reflection films (in this case, the reflection film 6) is a translucent film.

As shown in FIG. 2, the disc 1 has a structure including an outer peripheral area 10, an information area 11, an inner peripheral area 12, a clamping area 13, and a center hole 14. The outer area 10 is a portion where information is not recorded, the information area 1
1 is a portion where main information is recorded by the track 4, an inner peripheral area 12 is a portion where patterns 15 and 16 representing information of the constituent disks 2 and 3 are recorded, and a clamping area 13 is a portion where a player reproducing the disk is used. The center hole 14 is a portion for holding and fixing the disc and for positioning the disc when holding and fixing the disc to the player.

A pattern 15 is provided in the inner peripheral area of the constituent disk 2 and a pattern 16 is provided in the inner peripheral area of the constituent disk 3.
Is recorded. As shown in FIG. 2, the patterns 15 and 16 are recorded at different positions in the radial direction (preferably, positions separated by 1 mm or more in the radial direction). The pattern is information about what the component disk looks like (title of recorded content, identification number,
Lot number). In the case of this embodiment, both the patterns 15 and 16 are bar codes. FIG. 3 shows one of the barcodes 20 in an enlarged manner. The barcode 20 is formed of a set of tracks 21 formed in the circumferential direction and arranged in the radial direction. These tracks 21 are composed of continuous pits (grooves) as shown in FIG.
Is formed. FIG. 4 shows a top view on the left side and a sectional view on the right side.

Although the pattern in this embodiment is a barcode, the pattern is not limited to a barcode, and any pattern can be used as long as it can identify the contents of each component disk. FIG. 5 shows a case where characters are used as patterns. Such a character (English character A) 30 is also formed of a set of tracks 31 formed in the circumferential direction and arranged in the radial direction similarly to the bar code described above. When the pattern is represented by characters, the contents of the constituent disks can be easily recognized visually.

In this embodiment, the patterns 15, 16
Is recorded only on a part of the circumference, but may be recorded over the entire circumference.

Next, a method for confirming the constituent disks 2 and 3 of the disk 1 will be described with reference to FIG. The disk 1 is mounted on the inspection table 40 and rotates. The inspection light (laser light) 44 emitted from the laser light source 41 is a pattern 1
5 and 16 are irradiated. The inspection light 44 applied to the pattern 16 is reflected by the reflection film 6, and the reflected light (zero-order light) 46 enters the light receiver 43. The inspection light 44 applied to the pattern 15 passes through the translucent reflective film 6 and is reflected by the reflective film 5, and the reflected light (zero-order light) 45 passes through the translucent reflective film 6 and enters the light receiver 42. .

The light received by the light receivers 42 and 43 is converted into a voltage and sent to bar code recognition means (not shown) for reading. A control mechanism (not shown) compares the content read by the barcode recognition means with the regular content of each component disk to determine pass / fail. This makes it possible to automatically determine whether the constituent disks 2 and 3 of the disk 1 are correct.

When characters are used as patterns, character recognition means is used instead of bar code recognition means.

In this embodiment, two component disks are bonded together. Even when three or more component disks are bonded together, a pattern is recorded on each component disk in the same manner, The pattern can be read to determine whether each component disk is correct.

[0017]

According to the present invention, it is possible to easily and quickly confirm whether or not each of the constituent disks of the bonded disk is correct. It is also easy to fully automate this check.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a bonded disc 1 according to an embodiment.

FIG. 2 is a plan view of the disk 1. FIG.

FIG. 3 is an explanatory diagram of a barcode as a pattern.

FIG. 4 is an explanatory diagram of tracks constituting a barcode.

FIG. 5 is an explanatory diagram of characters that are patterns.

FIG. 6 is an explanatory diagram of a configuration disk checking method according to the embodiment.

[Explanation of symbols]

 Reference Signs List 1 disc 2 constituent disc 3 constituent disc 4 track 5 reflective film 6 reflective film 7 adhesive layer 10 outer peripheral area 11 information area 12 inner peripheral area 13 clamping area 14 center hole 15 pattern 16 pattern 20 bar code 21 track 22 pit 23 land 30 characters 31 track 40 inspection table 41 laser light source 42 light receiver 43 light receiver 44 inspection light 45 reflected light 46 reflected light

Claims (6)

[Claims] A plurality of component discs each having a recording surface, each of which is composed of a plurality of component discs, and a pattern representing component disc information is recorded on a portion other than the information area along a circumferential direction; The patterns of the disc are recorded at different positions in the radial direction, and the portion of the laminated disc where the patterns are recorded has transparency at least so that light reflected on the patterns and reflected can be recognized. A laminated disc formed by a set of tracks formed in a circumferential direction and arranged in a radial direction. 2. The laminated disc according to claim 1, wherein
A laminated disc, wherein the pattern is a barcode. 3. The laminated disc according to claim 1, wherein
Laminated disc wherein the pattern is a character 4. When checking the constituent disks of a bonded disk formed by bonding a plurality of constituent disks each having a recording surface, the bonded disk is attached to each component disk in a portion other than the information area in a circumferential direction. A pattern representing the component disk information is recorded along, the pattern of each component disk is recorded at a different position in the radial direction, and the part of the bonded disk where the pattern is recorded at least reflects the light irradiated and reflected on the pattern. Having a recognizable degree of transparency, the pattern is formed by a set of tracks formed in a circumferential direction and arranged in a radial direction,
A method of checking the structure of a bonded disk, comprising irradiating inspection light to the bonded disk, receiving reflected light reflected from the pattern, and checking each of the structural disks by pattern recognition means. 5. The method of claim 4, wherein the pattern recorded on the bonded disc is a barcode, and the pattern recognition means is a barcode recognition means. How to check the configuration disk of the combined disk 6. A bonded disk according to claim 4, wherein the pattern recorded on the bonded disk is a character, and the pattern recognizing means is a character recognizing means. How to check the configuration disk