JPH01264639A - Optical disk - Google Patents

Abstract

PURPOSE:To facilitate the administration of the optical disk in the production process from injection molding to packing by putting a mark for title identification to a specific region in the non-recording area where information is not recorded by transferring from a stamper. CONSTITUTION:The part between from the innermost circumference 5 to the inside circumference 3 of the recording surface is formed as the non-information recording area between the outside circumference 2 to the inside circumference 3 of the optical disk 1. A serial number 6 and the mark 7 for title identification are put to the part excluding a label sticking part 4 in this non-information recording area. The serial number 6 and the mark 7 for identification are attached by the method of previously putting the mark for title identification to a stamper and putting the mark 7 to the optical disk 1 by transfer. The weight balance of the disk 1 is measured and directions of the optical letters of the serial number 6 are matched in the direction where there is the weight unbalance, then the serial number 6 is put by marking. The administration of the optical disk is thus facilitated in the production process from the injection molding to packing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical disc on which recorded information can be reproduced using an original beam.

[Conventional technology]

Generally, the original disk is manufactured by injection molding using an existing disk called a standber as a mold.

However, it is technically difficult to make the original disc with a uniform thickness, and currently, in the manufacturing process (from injection molding to packaging), when the A-side disc and the B-side disc are bonded with gold, Then, they are pasted together so that the direction of the weight imbalance is diagonal, so that the weight imbalance is canceled out.

Therefore, in the manufacturing process of conventional optical discs, in the secondary processing line immediately after injection molding, a mark indicating the direction of weight imbalance (hereinafter referred to as unbalance mark) is placed at the position where the label is pasted. It was attached by a stamp. Furthermore, the unbalance mark also served as a title identification mark for identifying the title of information recorded on the optical disc. For example, such an unbalanced mark is the alphabet 2.
Six letters were used.

In addition to the above-mentioned unbalance mark, for example, a bar code attached to the label of an optical disc is used as a mark for identifying a title in a conventional optical disc, as described in Japanese Patent Laid-Open No. 56-25242. There was such a thing.

[Problem to be solved by the invention]

However, in the conventional optical disc mentioned above,
There were problems as shown below.

(1) In the secondary processing line after injection molding, the process of stamping an unbalance mark will increase.
Accordingly, the possibility that dust or the like will adhere to the optical disc increases, and the reliability of the optical disc deteriorates.

(2) Since only the - character can be attached to the unbalance mark, there is a limit to title identification.

(Currently, there are 26 alphabetical characters) (3) Since the unbalance mark is placed at the position where the label is pasted, if the label is pasted on the original disk, the unbalance mark will no longer be visible. Therefore, after a label is attached, it is impossible to tell whether the actual title of the information recorded on the original disc matches the title written on the label until the optical disc is played in a player. Furthermore, it is impossible to know whether the weight is balanced or not unless you measure the optical disc with a measuring device.

In addition, when a barcode is used as a title identification mark on a conventional optical disc, as mentioned above, the barcode is attached to a label, so before the label is attached, the information recorded on the optical disc is There was a problem in that the titles of the titles could not be identified.

The purpose of the present invention is to solve the problems of the prior art described above,
The title of the information recorded on the optical disc can be identified in all manufacturing processes, including before and after the label is pasted, and there is no limit to the title identification of the attached title identification mark. In addition, we have created an optical disc that can be marked to indicate the direction of weight imbalance without increasing the number of manufacturing steps, and can also be used to determine the weight balance even after a label is attached without having to measure it with a measuring device. It is about providing.

(!11: Means for Solving the Problem) In order to achieve the above-mentioned object, the present invention provides a title identification mark for identifying the title of information recorded on an optical disc during injection molding. A specific area in the non-recording area where the information is not recorded is stamped by transfer from a stamper.Furthermore, after injection molding, the product number is added to a specific area in the non-recording area. The direction of the first letter of is placed on the stamp so that it matches the direction of the weight imbalance.

[Effect]

Since the title identification mark has already been transferred to the optical disc at the stage of injection molding, when the A-side disc and the B-side disc are pasted together, there is no chance of pasting them together by mistake. In addition, since the title identification mark is attached to an area other than the area where the label is attached, it is possible to visually confirm whether the label has been incorrectly attached even after the label has been attached. Furthermore, since the direction of the first letter of the product number matches the direction of the weight imbalance, even after pasting the label, we check each time to see if it is correctly pasted to ensure that the imbalance is canceled out. You can check it without measuring with a device.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

The figure is a plan view showing an optical disc as an embodiment of the present invention.

In the figure, between the outer circumference 2 and the inner circumference 3 of the optical disc 1, a portion between the innermost circumference 5 and the inner circumference 3 of the recording surface is a non-information recording area. In this non-information recording area, a serial number 6 and a title identification mark 7 are attached to a portion other than the labeled portion 4.

First, how to attach the serial number 6 and the title identification mark 7.
When performing injection molding using a stand bar as a mold,
A title identification mark is placed in the stamper, and the title identification mark 7 is attached to the optical disc 1 by transfer. Thereafter, the weight balance of the optical disc 1 is measured, and the initial letter of the manufacturing unit 6 (the letter "A" in the figure) is aligned in the direction of the weight imbalance.
The manufacturing location 6 is attached by stamping.

As described above, according to this embodiment, since the title identification mark 7 is attached during injection molding, it is possible to identify the title of the recorded information before pasting the label.

In addition, since the title identification mark 7 is attached to a part other than the section 4, even after the label is attached, it is not necessary to set the optical disc 1 in the player and check the contents. You can see the title and visually check for mistakes in labeling. Further, since the title identification mark 7 does not double as an unbalance mark as in the conventional case, there is no limit to title identification, and it is possible to cope with an increase in the number of types of titles.

On the other hand, the number 6 is engraved so that the direction of the initial letter is in the direction of the weight imbalance, so if you look at the direction of the initial letter, you can see the direction of the weight imbalance. You can see it at a glance. Furthermore, since the step of removing all the unbalance marks is actually included in the step of attaching the prefabricated marks, the number of manufacturing steps does not increase. In addition, in the manufacturing unit 6, as with the title identification mark 7, the label is attached to a part other than part 4, so even after the label is attached, the discs on the A side and the disc on the B side cancel out the imbalance. You can visually check whether the sheets are diagonally diagonally aligned or not without using a measuring device.

〔Effect of the invention〕

As described above, according to the present invention, since the title identification mark is attached during injection molding, it is possible to identify the title of the recorded information before pasting the label.

In addition, since the title identification mark is attached to a part other than the label, even after the label is attached, it is important to check whether the title written on the label matches the actual title of the recorded information. can be confirmed visually. In addition, the title identification mark also serves as an unbalance mark like in the past, and it does not mean that only - characters can be attached, so there is no limit to title identification.
Even if the number of types of titles increases, it can be handled.

On the other hand, manufacturing is stamped so that the direction of the initial letter is in the direction of the weight imbalance, so if you just look at the direction of the initial letter, you can tell the direction of the weight imbalance. You can understand it at a glance.

Moreover, since the process of attaching unbalance marks in the conventional secondary processing line is actually included in the process of attaching prefabricated marks, there is no increase in the number of production processes, and therefore, there is less dust and dirt on the optical disc. The possibility of adhesion is also reduced, and the reliability of the optical disc is improved. In addition, in the manufacturing process, as with title identification marks, labels are attached to parts other than the parts, so even after the label is attached, it is necessary to check whether it has been attached correctly to cancel out the weight imbalance. without measuring with a measuring device.
You can check it visually.

The above effects make it easier to manage optical discs in the manufacturing process from injection molding to packaging.

[Brief explanation of the drawing]

The figure is a plan view showing an optical disc as an embodiment of the present invention. 1... Optical disc 2... Outer circumference 3... Inner circumference 4... Label pasted on section 5... Innermost circumference of recording surface 6... Manufacturer 7... Mark for title identification.

Claims (1)

[Claims] 1. In an optical disc manufactured by injection molding using a stamper as a mold, a title identification mark for identifying the title of information recorded on the optical disc during injection molding is An optical disc characterized in that information is attached to a specific area in a non-recording area where information is not recorded by transfer from the stamper. 2. In the optical disc according to claim 1, after injection molding, the serial number is placed in a specific area in the non-recording area, and the orientation of the first letter of the serial number matches the direction in which there is a weight imbalance. An optical disc characterized by being affixed by a stamp.