Title of Invention

"AN IMPROVED STRUCTURE OF A DUAL SURFACE OPTICAL DISC."

Abstract An improved structure of a dual surface optical disc is disclosed. The disc includes an upper layer and a lower layer. An adhesive layer is formed between the upper layer and the lower layer and the upper portion of the adhesive layer is a protective layer and the lower portion of the protective layer is a reflective layer, and the upper portion of the reflective layer is a dye layer, and the lower portion of the adhesive layer is provided with a protective layer and the upper layer and the lower layer are used for read/write recording medium to provide dual surface recording of different format
Full Text TITLE: AN IMPROVED STRUCTURE OF A DUAL SURFACE
OPTICAL DISC BACKGROUND OF THE INVENTION
(a) Technical Field of the Invention
The present invention relates to optical disc, and in particular, to a dual
surface optical disc which can be used as read/write format recording medium.
(b) Description of the Prior Art
Referring to FIG. 1, there is shown a conventional single layer disc and CD. On the mold of a fabrication machine, a mother disc is mounted and
ejection molding is used to fabricate transparent resin substrate, via the process of sputtering, the signal surface of the resin substrate is formed with an aluminum or metallic reflective film. After that an adhesive layer is made onto the surface thereof so as to adhere with another substrate to form into a disc. The next procedure is labeling and packaging.
As for CD and LD, a ground, cleaned glass another disc is coated with a
photoresist material, and by means of LBR (Laser Beam Recorder) to expose the photoresist, so that the signals are undergone Laser cutting. The input LBR signals are output signal and the mother disc after recording, imaging, conductive, sputtering, an electroplating process is preferred to form into
stamper.
DVD is known as Digital Versatile Disc which is a development from the existing CD-ROM. The size of DVD and CD-ROM is the same, however, the digital recording gap is reduced and the method of recording is changed, the contents for storage is increased, and the DVD is similarly used to store music, video signals and digital data for computers. In the earlier stage, DVD is known as Digital "Video Disc.
The storage of "Video Moving picture is by way of MPEG 2 Level compression technology and the quality of video is better than Laser Disc (LD), VHS recording tape and currently available VCD, and the audio signal is DOffi Y AC-3 audio technology.
A single disc can store a complete high quality movie (above 135 mins) with two contents (video signal and audio signal). In order to comply with the above condition, the capacity of the single disc has a minimum of 4.7GB, and the capacity is about 7 times of common CD, and the size is similar to that of the CD diameter 12cm, thickness 1.2mm and has the forward compatible characteristics. In other words, the DVD players must able to read various type of CD discs.
DVD optic disc capacity: Another re-generated layer on a single disc. Only one surface is recorded with material and the capacity is 4.7GB.
Single disc with dual layers: Only one surface is recorded with data and
the gaps between the data can be proceeded with dual layered recording. Then, the capacity of one optic disc is 8.5 GB.
Single layer ROM format recording media provides only single layer recording and will not enable dual layers recording, and the RO data cannot be recorded. Thus, the memory capacity cannot be increased and the space of single surface is restricted. Accordingly, it is an object of the present invention to provide a dual to surface read/write format recording medium.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention is to provide an improvement of a dual-surface optical disc having an upper layer and a lower layer characterized in that an adhesive layer is formed between the upper layer and the lower layer and the upper portion of the adhesive layer is a protective layer and the lower portion of the protective layer is a reflective layer, and the upper portion of the reflective layer is a dye layer, and the lower portion of the adhesive layer is provided with a protective layer and the upper layer and the lower layer are used for read/write recording medium to provide dual surface recording of different format.
Yet another object of the present invention is to provide an improved structure of a dual surface optical disc, wherein the format for read/write memory format on the upper layer of the optical disk is for the storage of video-audio format, and the lower layer of the optical disk is for video-audio format.
Still another object of the present invention is to provide an improved structure of a dual surface optical disc, wherein the format for read/write memory format on the upper layer of the optical disk is for the storage of text format, and the lower layer of the optical disk is for text format.
The foregoing object and summary provide only a brief introduction to
the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts.
Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a structural view of a conventional single surface optical disc.
FIG. 2 is a structural view of a dual surface optical disc in accordance with the present invention.
FIG. 3 is an adhesive structure in accordance with the present invention.
FIG. 4 is a detailed structure view of a dual surface in accordance with the present invention.
FIG. 5 is a preferred embodiment in accordance with the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The following descriptions are of exemplary embodiments only, and are not intended to limit the scope, applicability or configuration of the invention in any way. Rather, the following description provides a convenient illustration for implementing exemplary embodiments of the invention. Various changes to the described embodiments may be made in the function and arrangement of the elements described without departing from the scope of the invention as set forth in the appended claims.
Referring to FIGS. 2 to 4, there is shown an improved structure of a dual-surface optic disc structure, wherein the two surfaces of an optic disc 1 are read/write format recording medium. The optic disc 1 includes an upper layer 2 and a lower layer 3, and there is an adhesive layer 10 between the upper layer 2 and the lower layer 3. The upper portion of the adhesive layer 10 is mounted with a protective layer 21, or may not have the layer. The upper portion of the protective layer 21 is provided with a reflective layer 22, and the upper portion of the reflective layer 22 is provided with a dye layer 23. The lower portion of the adhesive layer 10 is provided with a protective layer 31, or may not have the protective layer. The lower portion of the protective layer 31 is mounted with a reflective layer 32, and the lower portion of the reflective layer 32 is provided with a dye layer 33. The surfaces of the upper
layer 2 and the lower layer 3 can be used to record material so as to form at least one dual surface read/write layer. The capacity of recording on the two surfaces of the optical disc is about 9.4GB.
Referring to FIG. 5, there is shown a dual-surface optic disc structure. The fabrication of the optic disc comprises the steps of pre-fabrication step 4, master disc-engineering 41, ejection molding engineering 42, sputtering engineering 43, adhesion engineering 44, printing engineering 45, inspect engineering 46.
Different type of adhesion will produce different format of DVD product. If thermal fusion or UV curing is used as in adhesion step, where two 0.6mm thick DVD-R or RAV or one 0.6mm thick DVD-R or RW, and one DVD-5 or DVD-9 are mounted to form DVD optical disc.
Thermal fusion adhesion technology makes use of the fused rubber to coat onto the rear surface of the optical discs and two 0.6mm thick optical discs are then mounted to each other. After the discs are coated, the substrates of the two 0.6mm thick discs are adhered.
For UV adhesion, UV adhesive are coated onto the substrate of the optical disc, and two 0.6mm disc are glued together. By UV radiation, the UV adhesive is cured.
The read/write memory format of the upper layer 2 of the optical is used
for the storage of text and video-audio data. The lower layer 3 is a polycarbonate substrate.
The advantages of the dual surface DVD disc are as follows:
Dual layer recording, a single disc but has a capacity of two optical
disc.
Classify by single layer and dual layer recording.
The capacity is beyond existing CD-ROM optic disc (about 650
MB), even exceeding hard disc capacity (about 2GB to 4GB)
Dual layer read/write format recording medium.
It will be understood that each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above.
While certain novel features of this invention have been shown and described and are pointed out in the annexed claim, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the spirit of the present invention.


We claim:
1. An improvement of a dual-surface optical disc (1) having an upper layer (2) and a lower layer (3) characterized in that an adhesive layer (10) is formed between the upper layer and the lower layer and the upper portion of the adhesive layer (10) is a protective layer (12) and the lower portion of the protective layer is a reflective layer (22) and the upper portion of the reflective layer is a dye layer(33), and the lower portion of the adhesive layer is provided with a protective layer and the upper layer and the lower layer are used for read/write recording medium to provide dual surface recording of different format.
2. The improvement as claimed in claim 1, wherein the format for read/write memory format on the upper layer of the optical disk is for the storage of video-audio format, and the lower layer of the optical disk is for the video-audio format.
3. The improvement as claimed in claim 1 wherein the format for read/write memory format on the upper layer of the optical disk is for the storage of text format, and the lower layer of the optical disk is for text format.
4. The improvement as claimed in claim 1 wherein the format for read/write memory format on the upper layer of the optical disk is for the storage of text format, and the lower layer of the optical disk is for the text and video-audio format.
5. The improvement as claimed in claim 1, wherein the upper or lower layer of
the optical disk contains at least one readable/writeable layer on the dual
surface recording material.
6. The improvement as claimed in claim 1, wherein the upper layer is for storage of text and video-audio format material and the tower layer is a polycarbonate

Documents:

1219-del-2003-abstract.pdf

1219-DEL-2003-Claims-(09-02-2012).pdf

1219-del-2003-claims.pdf

1219-DEL-2003-Correspondence Others-(09-02-2012).pdf

1219-DEL-2003-Correspondence-Others-(03-05-2010).pdf

1219-del-2003-correspondence-others.pdf

1219-del-2003-description (complete).pdf

1219-del-2003-drawings.pdf

1219-del-2003-form-1.pdf

1219-del-2003-form-13.pdf

1219-del-2003-form-18.pdf

1219-del-2003-form-2.pdf

1219-del-2003-petition-138.pdf

1291-DEL-2003-Abstract-07-04-2008.pdf

1291-DEL-2003-Claims-07-04-2008.pdf

1291-DEL-2003-Correspondence-Others-07-04-2008.pdf

1291-DEL-2003-Drawings-07-04-2008.pdf

1291-DEL-2003-Form-2-07-04-2008.pdf

1291-DEL-2003-GPA-07-04-2008.pdf

1319-DEL-2003-Abstract-(03-12-2008).pdf

1319-DEL-2003-Correspondence-Others-(03-12-2008).pdf

1319-DEL-2003-Drawings-(03-12-2008).pdf

1319-DEL-2003-Form-3-(03-12-2008).pdf


Patent Number 256340
Indian Patent Application Number 1219/DEL/2003
PG Journal Number 23/2013
Publication Date 07-Jun-2013
Grant Date 04-Jun-2013
Date of Filing 30-Sep-2003
Name of Patentee ONID TECHNOLOGY CORP.
Applicant Address FL. 6, NO. 31, LANE 169, KANG NING ST., HSI CHIH CITY, TAIPEI CITY, TAIWAN.
Inventors:
# Inventor's Name Inventor's Address
1 LIU WEN-CHUAN FL. 6, NO. 31, LANE 169, KANG NING ST., HSI CHIH CITY, TAIPEI CITY, TAIWAN.
PCT International Classification Number G11B 7/18
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA