JPS60173733A - Optical memory medium and its manufacture - Google Patents

Abstract

PURPOSE:To correct the recorded information or to renew and add the recorded information by providing in parallel the recorded part contg. the information edited by a disk manufacturer and the unrecorded part which can be recorded by a user. CONSTITUTION:The regions 2 and 3 are arranged to a discoid substrate 1 consisting of polymethyl methacrylate. The region 2 is the recorded part, and a video signal and a sound signal are frequency-modulated for the explanation of a product, for example. The frequency-modulated outputs consist of tracks in the form of rows of recessed or protruded pits. The region 3 is the unrecorded part wherein a recessed straight groove is formed as a guide groove when the part is recorded by the users. Each track of the regions 2 and 3 can be formed spirally at a pitch of 1.7mum, for example, and each region having 1,000 tracks are alternately formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an optical memory medium suitable for use in a large-capacity optical disk memory device for recording and reproducing information at high density, and a method for manufacturing the same.

[Prior art]

An example of a conventional optical memory medium of this type is a disk medium used in the video playback device "La5er Disc (trade name) JK."This disk medium uses an Ar laser on a photoresist film coated on a glass disc. After recording a video signal using a method such as the above, and then developing it, a nickel-plated original plate is created, and using this original plate, a reflective film such as AJ is attached to a plastic disk that is reproduced by the press method or injection method. are doing.

This duplicated disk medium is inserted into a playback device to play back the information, and the recorded information may be information recorded in advance by the supplier, such as movies, lesson materials for golf, English conversation, etc. be. Naturally, this type of disk medium has the disadvantage that it does not allow the user to easily record information.

Another example of this type of optical memory medium is a so-called write-once optical memory medium. In this optical memory medium, a track guide groove is formed in advance on a plastic or glass disc, and a user records data onto an optical disk medium along the guide groove using an information input device such as a video camera or VTR. do. As a recording layer, for example, T
A thin film based on Te (e.g., Te lower oxide +
As-Te.

082-Te, Te-0, etc.) are used.

Furthermore, as a recording layer, Gd-Co, Tb-F
There is also an optical disk medium that is made rewritable by using an amorphous magneto-optical material made of a rare earth-transition metal such as e.

Above, we have explained examples of two types of left disk media that are already in practical use.In the former, it is almost impossible for the user to record information, and some of the information recorded is If it becomes necessary to modify or update the
This method has the disadvantage that the disk medium must be newly manufactured, which is very expensive and is not economical.

In addition, in the latter case, much of the information cannot be obtained by the user, and even if it can be obtained, a lot of equipment is required to edit the information and record it on an optical disk medium, and the user cannot obtain it. However, it is not economical to edit and record the entire disk medium.

In other words, the editing and recording of information shared by users is performed by a specialized department, and among the recorded information,
From an economic standpoint, there is an inevitable demand for an optical disk medium that allows the user to make partial corrections or updates when the need arises.

〔the purpose〕

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide an optical memory medium in the form of an optical disk that has a function of modifying, updating, or adding to already recorded information. It's about doing.

Another object of the invention is to provide a method for appropriately manufacturing such an optical memory medium.

[Structure of the invention]

In order to achieve this object, in the present invention, an optical memory medium is constructed by providing a pre-recorded portion containing information edited by the disc manufacturer and an unrecorded portion that can be recorded by the user.

That is, the optical memory medium of the present invention has a base body in which recorded tracks having bit strings on which information has already been recorded and groove tracks on which no information is recorded are alternately arranged in a concentric or spiral manner. , is characterized in that a recordable recording layer is disposed on the substrate.

Here, the recording layer is a thin film made of a compound or alloy containing at least one of Te, Ss, and Sb;
It can be an amorphous magneto-optical recording thin film made of rare earth-potent metal or a crystalline compound magneto-optical recording thin film based on MnB1 or MnB1.

In the manufacturing method of the present invention, a photoresist is applied to a glass disk, and -c 1117 is applied to the photoresist coating layer.
Exposed tracks in which information is recorded in the form of pit rows and groove tracks in which information is not recorded are alternately arranged in a concentric or spiral pattern, and the exposed glass disk is exposed to light. A master disc is created by developing the disc, a stamper is created by plating the master disc with nickel, and the stamper is used to duplicate the base having the recorded track and the groove track, so that recording can be performed on the base. form a recording layer.

〔Example〕

The present invention will be described in detail below with reference to IC drawings.

FIG. 1 shows a first embodiment of the invention, and FIG. 2 shows a cross section of the structure. Here, l is, for example, polymethyl methacrylate (PMMA) with a diameter of 30 mm and a thickness of 1.2 mm.
), and this substrate 1 has a region 2.
and 3 are placed. Area 2 is the previously described green area, where, for example, video signals and audio signals for product explanation are FM modulated, and the It'M side forms four-shaped DC grooves as track guide grooves for recording. put. Each of the tracks in regions 2 and 3 can be alternately formed in a spiral shape at a pitch of 1.7 μm, for example.

The base body 1 can be manufactured by the same process as the method for manufacturing the disk medium used for the La5er Disc described above. That is, in forming the green portion 2 described above, a photoresist is applied to a glass disk, and then FM-modulated Ar laser light modulated by a video signal and an audio signal is focused and irradiated onto the photoresist. do. To form the unrecorded portion 3, it is sufficient to irradiate the photoresist 7 with unmodulated focused light.

The glass disk on which the photoresist has been exposed in this manner is then developed and then a nickel-plated stamper is produced. Furthermore, nickel plating is applied to the stand bar to form a mother plate.

Using this mother plate, a PMMA substrate 1 having a recorded portion 2 and an unrecorded portion 3 is molded using an injection method. Next, 're ISe,S is applied to the surface of this substrate 1.
A compound or alloy, such as As, oTe, etc., containing at least one of b. The optical disc medium 10 of the present invention is obtained by forming the recording layer 4 made of a thin film of.

Test results using this optical disk medium 10 are shown below. This optical disk medium IO was attached to a recording/reproducing chain using a semiconductor laser, and video and audio signals for product explanation were reproduced from the 1000 tracks in the green section 2 described above. By rotating this optical disk medium 1o at 180 rpm and reproducing information with a semiconductor laser power (about 1 mW) that does not melt and evaporate the As-Te film as the recording layer 4, the optical disk medium 1o is heated for about 5 minutes. The product was explained using video and audio.

Subsequently, in order to correct the information in the recorded green area 2, a video signal and an audio signal are transferred to the unrecorded area 3 consisting of 100 tracks adjacent to the recorded green area 2 using a commercially available VTR video camera. was recorded. At this time, the recording power is As
- Considering the recording sensitivity of the Te film, the power was set at 10 mW. As a result of playing back this corrected information at a playback power of about 1mW, when comparing the video and audio with those in the green section 2, the video quality was slightly lower, but the customer's satisfaction was diminished. I was able to explain the product without any problems.

(Te, Se, St) for forming the recording layer 4
The compound or alloy containing at least one of the above-mentioned As1o'l'e. The same effect was obtained by using TeaX (x21.1) and 5b2se.

FIG. 3 shows a second embodiment of the invention, and FIG. 4 shows its structural cross section. Here, 11 is a disk-shaped PMMA substrate that is replicated by the injection method, as in the first embodiment, and its dimensions can be the same as in the first embodiment.

12 is a recorded track, and 13 is an unrecorded track. These tracks 12 and 13 are alternating concentric tracks. The surface of the substrate 11 is coated with Tb23, which is an amorphous magneto-optical material containing a rare earth-transition metal.
An optical memory medium 2o of the present invention is obtained by forming a thin film 14 (thickness: 1000, for example) of Fe.

For example, when document information is recorded in the recorded portion 12, the recorded track 12 is reproduced by an information recording/reproducing device using a semiconductor laser to obtain the document information, as in the first embodiment. Subsequently, information for modifying one line of the document was recorded in the unrecorded track 13 adjacent to the recorded track 12 using an input device consisting of a keyboard, a display, and a video output device. By reproducing the correction information, the information on the recorded track 12 could be corrected.

It should be noted that since the optical disk medium of this example is rewritable, it was confirmed that by repeating the above operation, the corrected track could be further corrected by 1 m.

Materials for the recording layer 4 or 14 include, in addition to those mentioned above,
MnB1 or MnB1 f: A basic crystalline compound magneto-optical recording material such as In Ou Bi can also be used.

〔effect〕

As explained above, according to the present invention, pre-recorded information can be reproduced, and information can be recorded as soon as it is corrected in the blank area of the unrecorded track, thereby making it possible to reproduce the pre-recorded information. It is possible to modify and record a part of the information contained in the optical disk, and therefore, the economic effect is extremely large when creating an optical disk medium.

[Brief explanation of the drawing]

1 and 2 are a plan view and a partially sectional perspective view, respectively, and FIGS. 3 and 4 show a first embodiment of the present invention.
The figures are a plan view and a partial sectional view, respectively, showing a second embodiment of the invention. DESCRIPTION OF SYMBOLS 1...Substrate, 2... Recorded part, 3... Unrecorded part, 4... Recording layer, 10... Optical disk medium, 11... Substrate - 12... Recorded track , 13... End recording, recording track, 14... Recording layer, 20... Optical disc medium. Patent applicant Nippon Telegraph and Telephone Public Corporation Figure 3

Claims (1)

[Scope of Claims] A base body formed by alternately arranging recorded needle tracks having bit strings in which 1'R information has already been recorded and groove tracks in which no information is recorded in a concentric or spiral shape. 1. An optical memory medium comprising: a recordable recording layer disposed on the substrate. 2) The optical memory medium according to claim 1, wherein the recording layer is a thin film made of a compound or an alloy containing at least one of Te, Se, and Sb. 5) The optical memory medium according to claim 1, wherein the recording layer is an amorphous magneto-optical recording film made of rare earth-transition metal. 4) The recording layer is MnB1 or MnB1'fr
2. The optical memory medium according to claim 1, wherein the optical memory medium is a magneto-optical recording thin film based on a crystalline compound. 5) A photoresist is applied to a glass disk, and the pre-recorded needle tracks in which information is recorded in the form of pit rows and the groove tracks in which no information is recorded are alternated concentrically or spirally on the photoresist coating layer. The exposed glass disk of these tracks is developed to create a master disc, this master disc is nickel-plated to create a meta/par, and the stamper is used to create a master disc. 1. A method for manufacturing an optical IJ medium, which comprises duplicating a substrate having the needle tracks and the groove tracks, and forming a recordable recording layer on the substrate. (Margin below)