CA1196720A - Disc-shaped, optically readable information carrier having high storage density - Google Patents
Disc-shaped, optically readable information carrier having high storage densityInfo
- Publication number
- CA1196720A CA1196720A CA000407148A CA407148A CA1196720A CA 1196720 A CA1196720 A CA 1196720A CA 000407148 A CA000407148 A CA 000407148A CA 407148 A CA407148 A CA 407148A CA 1196720 A CA1196720 A CA 1196720A
- Authority
- CA
- Canada
- Prior art keywords
- information
- information carrier
- carrier
- primary color
- protective layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000010410 layer Substances 0.000 claims abstract description 24
- 239000011241 protective layer Substances 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims 1
- 230000001681 protective effect Effects 0.000 abstract description 4
- 238000007639 printing Methods 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001747 exhibiting effect Effects 0.000 description 2
- 239000004922 lacquer Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- ZLHFONARZHCSET-UHFFFAOYSA-N 5-aminolevulinic acid hydrochloride Chemical compound Cl.NCC(=O)CCC(O)=O ZLHFONARZHCSET-UHFFFAOYSA-N 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/24094—Indication parts or information parts for identification
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/38—Visual features other than those contained in record tracks or represented by sprocket holes the visual signals being auxiliary signals
- G11B23/40—Identifying or analogous means applied to or incorporated in the record carrier and not intended for visual display simultaneously with the playing-back of the record carrier, e.g. label, leader, photograph
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
- Manufacturing Optical Record Carriers (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An information carrier comprises a transparent carrier plate having a center hole and having an information-carrying side which exhibits the information in the form of a micro structure disposed in a concentric annular surface and which is covered with a reflective layer, being further covered with an outer protective layer. The outer protective is realized by an overprint of the primary color of sufficient thickness which, in turn, carries written and figurative information applied thereto either monochromatically or polychromatically.
An information carrier comprises a transparent carrier plate having a center hole and having an information-carrying side which exhibits the information in the form of a micro structure disposed in a concentric annular surface and which is covered with a reflective layer, being further covered with an outer protective layer. The outer protective is realized by an overprint of the primary color of sufficient thickness which, in turn, carries written and figurative information applied thereto either monochromatically or polychromatically.
Description
72~
BACKGROUND OF T~E INVENTION
Field of the Invention The present invention relates to a disc-shaped, optically readable information carrier having high storage density comprising a transparent carrier disc exhibiting a center hole and having an information-carrylng side which exhibits the information in the form of a micro-structure disposed in a concentric annular surface and covered with a reflective film, being covered with an outer protective layer.
Description of the Prior Art Information carriers of the type generally set forth above are known, for example, from the German allowed application 23 41 338. The information structure existing on the one side of the transparent carrier plate is read through the plate during reproduction by a focused laser beam, whereby the optical structure is made insensitive to dust and damage to a certain degree. The protective layer on that side of the carrier plate carrying the information can be a paper layer or a synthetic film provided with an adhesive. It is also possible to realize the layer by, for example, a sprayed-on lacquer layer whose thickness exceeds the depth of the information structure.
As practice has shown, paper layers or synthetic films provided with adhesive are generally not suitable as protective layers because a grain-oriented paper layer promotes warping of the disc, as does also the coefficient of thermal expansion of a synthetic film which is generally different relative to -the material of the carrier plate. Such , o warping phenomena are ex-tremely critical, since the admissible tolerance limits to be required given such plates for the planarity of the plates, in consideration of the op-tical read system, are very narrow. For the same reasons, it must be re-quired that a protec-tive layer realized, for example, by a spray-on lacquer layer, exhibits practically no fluctuations in thickness over the entire surface.
~ dded thereto is that the dangerof warping is further increased by labels which are to be applied to the structure.
Independently of the protective layer itself, the influence of paper or synthetic film labels on the warping tendency of such a disc is all the more pronounced the smaller the ratio of the disc diameter to the label diameter. Particularly critical considera-tions are therefore given for the digital audio disc which has entered the literature under the designation Compact Disc, -this exhibiting a disc diameter of only approximately 12 cm, and given which the label to be applied to the protective layer can-not be selected with as small a diameter as desired in view of the generally extensive informational data.
SUMMARY OF THE INVENTION
The object of the presen-t invention, therefore, is to provide a solution for the protec-tive layer in conjunction with the label, particularly for a Compact Disc, which overcomes the aEoremen-tioned difficulties which have heretofore occurred.
Given a disc-shaped, optically readable information carrier having high storage density of the type generally set forth above, -this object is achieved, according to the present inven-tion, in that the outer protective layer is an over print
BACKGROUND OF T~E INVENTION
Field of the Invention The present invention relates to a disc-shaped, optically readable information carrier having high storage density comprising a transparent carrier disc exhibiting a center hole and having an information-carrylng side which exhibits the information in the form of a micro-structure disposed in a concentric annular surface and covered with a reflective film, being covered with an outer protective layer.
Description of the Prior Art Information carriers of the type generally set forth above are known, for example, from the German allowed application 23 41 338. The information structure existing on the one side of the transparent carrier plate is read through the plate during reproduction by a focused laser beam, whereby the optical structure is made insensitive to dust and damage to a certain degree. The protective layer on that side of the carrier plate carrying the information can be a paper layer or a synthetic film provided with an adhesive. It is also possible to realize the layer by, for example, a sprayed-on lacquer layer whose thickness exceeds the depth of the information structure.
As practice has shown, paper layers or synthetic films provided with adhesive are generally not suitable as protective layers because a grain-oriented paper layer promotes warping of the disc, as does also the coefficient of thermal expansion of a synthetic film which is generally different relative to -the material of the carrier plate. Such , o warping phenomena are ex-tremely critical, since the admissible tolerance limits to be required given such plates for the planarity of the plates, in consideration of the op-tical read system, are very narrow. For the same reasons, it must be re-quired that a protec-tive layer realized, for example, by a spray-on lacquer layer, exhibits practically no fluctuations in thickness over the entire surface.
~ dded thereto is that the dangerof warping is further increased by labels which are to be applied to the structure.
Independently of the protective layer itself, the influence of paper or synthetic film labels on the warping tendency of such a disc is all the more pronounced the smaller the ratio of the disc diameter to the label diameter. Particularly critical considera-tions are therefore given for the digital audio disc which has entered the literature under the designation Compact Disc, -this exhibiting a disc diameter of only approximately 12 cm, and given which the label to be applied to the protective layer can-not be selected with as small a diameter as desired in view of the generally extensive informational data.
SUMMARY OF THE INVENTION
The object of the presen-t invention, therefore, is to provide a solution for the protec-tive layer in conjunction with the label, particularly for a Compact Disc, which overcomes the aEoremen-tioned difficulties which have heretofore occurred.
Given a disc-shaped, optically readable information carrier having high storage density of the type generally set forth above, -this object is achieved, according to the present inven-tion, in that the outer protective layer is an over print
2--of a primary color of thickness greater -than the microstructure which, in turn, carries written and figurative information applied thereto monochromatically or polychromatically.
The present invention is based on the precept -that the required protec-tive layer can be realized in an extremely simple mallner by applying a color of sufficient thickness which simulta-neously represen-ts the underlay for the lahel to be applied. In addition, the application of the primary color by printing also makes a very uniform texture of -the layer of printing ink pos-sible across the surface of the carrier plate. By so doing, alabel extendiny over the entire surface of one side of the information carrier is simultaneously realized in an extremely advantageous manner, the label, in contrast to paper or synthetic film labels, exerting no warping forces on the disc.
In order to promote a rapid drying of the color to be printed and in order to promote the same to a sufficient degree, it is entirely meaningful to construct the color impression of two or more layers,namely, in such a manner that an applied color layer is dried in an intermediate step before the nex-t color layer is printed.
ior the purpose of a better adhesion of the primary or fla-t color to the side of the carrier plate carrying -the inEormation, it can also be meaningful to first apply a primary coat in the form of an underlayer which is expedien-tly likewise printed on but, however, can also be applied under certain con-ditions by a centrifuyal or spray operation.
The -tampon printing method set forth in -the German Le-tters Pa-tent 23 04 723, column 2, lines 26-72, is particularly suited for the impression of the primary color, as well as for the figurative and wri-tten information to be printed onto -the primary color, the printing method, in turn, leading to optimum work results with the printing device specified in the above mentioned letters patent.
BRIEF DESCRIPTION OF THE DRAWINGS
O-ther objects, features and advantages of the invention, its organization, construction and operation will be best under-stood from the following detailed descrip-tion, taken in conjunc-tion wi-th the accompanying drawings, on which:
Figure 1 is a plan view Or an information carrier having a first surface shape of the label protective layer;
Figures 2 and 3 are sectional views of the information carrier of Figure 1 having different primary color layer formats;
Figure 4 is a plan view of an information carrier having a second surface shape of the label protective layer;
Figures 5 and 6 are sectional views of the informatipn carrier of Figure 4 having various primary color layer formats;
Figure 7 is a plan view of an information carrier having a third surface shape of the label protective area;
7~
FIGS. 8 and 9 are sectional views of the information carrier of FIG. 7 having different primary color layer formats;
FIG. 10 is a plan view of an information carrier having a fourth surface shape of the label protective layer; and FIGS. 11 and 12 are sectional views of the information carrier according to FIG. 1.0 having different primary color layer formats.
~ESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to FIG. 1, the information carrier disc 1 has a label protective area which is only limited by a center hole M and by the edge of the disc. As the sectional illustration of FIG. 2 further illustrates, it is applied to the information side of the carrier plate 1 in a single primary color layer 2. The information printing 3 applied to the primary color layer 2, as in all other sectional illustrations of FIGS. 5, 6, 8, 9, 11 and 12, is indicated in a broken line extending over the primary color layer 2.
In addition to the color layer 2, the alternative shown in the sectional illustration of FIG. 3 also exhibits an underlayer 4 which can either likewise comprise the same primary color as the primary color layer 2 or, cn the other hand, is a priming coat serving the purpose of better adhesion of the primary color layer 2 to the information side of the carrier plate 1.
The information carrier plate 1 illustrated in FIG. 4 includes a second surface shape of the protective layer which is limited by the center hole M and by a narrow, information-free, outer annular zone AR. Thereby, the sectional illustra-tions of FIGS. 5 and 6 correspond -to the sectional illustrations of FIGS. 2 and 3. Under certain conditions, the outer annular zone AR can be required for reasons of printiny technology.
The information carrier plate 1 according to FIG. 7 comprises a third surface shape of the label protective layer which is limited/ on the one hand, by the outer edge of the disc and, on the other hand, by the outer edge of the information-free, concentric, inner annular zone IR. This surface shape can also prove meaningful in view of requirements of printing technology. The sectional illustrations of the information carrier plate 1 according to FIG. 7 in FIGS. 8 and 9 again correspond to the sectional illustrations of FIGS. 2, 5 and 3, 6.
Finally, th~plan view of the information carrier plate 1 according to FIG. 10 illustrates a fourth surface shape of the label protective area which is limited both by a narrow, information-free outer annular zone AR and by an inner, information-free annular zone IR. The sectional illustrations of the information carrier plate 1 according -to FIG. 10 in FIGS. 11 and 12 again correspond to the sectional illustrations of FIGS. 2, 5, 8 and 3, 6, 9.
Although we have described our invention by reference to particular illustrative embodiments thereof, many changes and modifications of the invention may become apparent to those skilled in the art withou-t departing from the spirit and scope of the invention. We therefore intend to include within the patent warranted hereon all such changes and modifications as may reasonably and properly be included within the scope of our contribution to the art.
The present invention is based on the precept -that the required protec-tive layer can be realized in an extremely simple mallner by applying a color of sufficient thickness which simulta-neously represen-ts the underlay for the lahel to be applied. In addition, the application of the primary color by printing also makes a very uniform texture of -the layer of printing ink pos-sible across the surface of the carrier plate. By so doing, alabel extendiny over the entire surface of one side of the information carrier is simultaneously realized in an extremely advantageous manner, the label, in contrast to paper or synthetic film labels, exerting no warping forces on the disc.
In order to promote a rapid drying of the color to be printed and in order to promote the same to a sufficient degree, it is entirely meaningful to construct the color impression of two or more layers,namely, in such a manner that an applied color layer is dried in an intermediate step before the nex-t color layer is printed.
ior the purpose of a better adhesion of the primary or fla-t color to the side of the carrier plate carrying -the inEormation, it can also be meaningful to first apply a primary coat in the form of an underlayer which is expedien-tly likewise printed on but, however, can also be applied under certain con-ditions by a centrifuyal or spray operation.
The -tampon printing method set forth in -the German Le-tters Pa-tent 23 04 723, column 2, lines 26-72, is particularly suited for the impression of the primary color, as well as for the figurative and wri-tten information to be printed onto -the primary color, the printing method, in turn, leading to optimum work results with the printing device specified in the above mentioned letters patent.
BRIEF DESCRIPTION OF THE DRAWINGS
O-ther objects, features and advantages of the invention, its organization, construction and operation will be best under-stood from the following detailed descrip-tion, taken in conjunc-tion wi-th the accompanying drawings, on which:
Figure 1 is a plan view Or an information carrier having a first surface shape of the label protective layer;
Figures 2 and 3 are sectional views of the information carrier of Figure 1 having different primary color layer formats;
Figure 4 is a plan view of an information carrier having a second surface shape of the label protective layer;
Figures 5 and 6 are sectional views of the informatipn carrier of Figure 4 having various primary color layer formats;
Figure 7 is a plan view of an information carrier having a third surface shape of the label protective area;
7~
FIGS. 8 and 9 are sectional views of the information carrier of FIG. 7 having different primary color layer formats;
FIG. 10 is a plan view of an information carrier having a fourth surface shape of the label protective layer; and FIGS. 11 and 12 are sectional views of the information carrier according to FIG. 1.0 having different primary color layer formats.
~ESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to FIG. 1, the information carrier disc 1 has a label protective area which is only limited by a center hole M and by the edge of the disc. As the sectional illustration of FIG. 2 further illustrates, it is applied to the information side of the carrier plate 1 in a single primary color layer 2. The information printing 3 applied to the primary color layer 2, as in all other sectional illustrations of FIGS. 5, 6, 8, 9, 11 and 12, is indicated in a broken line extending over the primary color layer 2.
In addition to the color layer 2, the alternative shown in the sectional illustration of FIG. 3 also exhibits an underlayer 4 which can either likewise comprise the same primary color as the primary color layer 2 or, cn the other hand, is a priming coat serving the purpose of better adhesion of the primary color layer 2 to the information side of the carrier plate 1.
The information carrier plate 1 illustrated in FIG. 4 includes a second surface shape of the protective layer which is limited by the center hole M and by a narrow, information-free, outer annular zone AR. Thereby, the sectional illustra-tions of FIGS. 5 and 6 correspond -to the sectional illustrations of FIGS. 2 and 3. Under certain conditions, the outer annular zone AR can be required for reasons of printiny technology.
The information carrier plate 1 according to FIG. 7 comprises a third surface shape of the label protective layer which is limited/ on the one hand, by the outer edge of the disc and, on the other hand, by the outer edge of the information-free, concentric, inner annular zone IR. This surface shape can also prove meaningful in view of requirements of printing technology. The sectional illustrations of the information carrier plate 1 according to FIG. 7 in FIGS. 8 and 9 again correspond to the sectional illustrations of FIGS. 2, 5 and 3, 6.
Finally, th~plan view of the information carrier plate 1 according to FIG. 10 illustrates a fourth surface shape of the label protective area which is limited both by a narrow, information-free outer annular zone AR and by an inner, information-free annular zone IR. The sectional illustrations of the information carrier plate 1 according -to FIG. 10 in FIGS. 11 and 12 again correspond to the sectional illustrations of FIGS. 2, 5, 8 and 3, 6, 9.
Although we have described our invention by reference to particular illustrative embodiments thereof, many changes and modifications of the invention may become apparent to those skilled in the art withou-t departing from the spirit and scope of the invention. We therefore intend to include within the patent warranted hereon all such changes and modifications as may reasonably and properly be included within the scope of our contribution to the art.
Claims (11)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a disc-shaped, optically readable information carrier of high information density and of the type in which a transparent carrier plate has a central axis of roatation and an information-carrying side bearing information in the form of a microstructure disposed in an annular surface which is concentric to the axis and covered with a reflective film, the reflective film being covered with at least one outer protective layer, the improvement therein comprising: a primary color overprint material of thickness greater than said microstructure as said outer protective layer; and label information carried by said outer protective layer.
2. The improved information carrier of claim 1, wherein:
said label information comprises written information.
said label information comprises written information.
3. The improved information carrier of claim 1, wherein:
said label information comprises figurative information.
said label information comprises figurative information.
4. The improved information carrier of claim 1, wherein:
said primary color overprint material comprises two layers.
said primary color overprint material comprises two layers.
5. The improved information carrier of claim 1, wherein:
said primary color overprint material comprises more than two layers.
said primary color overprint material comprises more than two layers.
6. The improved information carrier of claim 1, and fur-ther comprising: a primer coat carrying said primary color layer.
7. The improved information carrier of claim 1, wherein:
said primary color material extends radially to a point short of, and providing an uncovered ring adjacent the peripheral edge of said carrier.
said primary color material extends radially to a point short of, and providing an uncovered ring adjacent the peripheral edge of said carrier.
8. The improved information carrier of claim 1, wherein:
said primary color material extends radially to a point short of, and providing an uncovered ring adjacent the axis of rotation of said carrier.
said primary color material extends radially to a point short of, and providing an uncovered ring adjacent the axis of rotation of said carrier.
9. The improved information carrier of claim 1, wherein:
said carrier comprises a central hole about the axis of rotation; and the primary color material extends radially to a point short of said hole.
said carrier comprises a central hole about the axis of rotation; and the primary color material extends radially to a point short of said hole.
10. The improved information carrier of claim 1, wherein:
said outer protective layer extends over the entire information-carrying side of said information carrier.
said outer protective layer extends over the entire information-carrying side of said information carrier.
11. The improved information carrier of claim 1, wherein:
said information carrier is an audio disc of approximately 12 cm diameter and a printed label as said outer protective layer.
said information carrier is an audio disc of approximately 12 cm diameter and a printed label as said outer protective layer.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3127993.7 | 1981-07-15 | ||
| DE19813127993 DE3127993A1 (en) | 1981-07-15 | 1981-07-15 | DISK-SHAPED OPTICALLY READABLE INFORMATION CARRIER WITH HIGH STORAGE DENSITY |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1196720A true CA1196720A (en) | 1985-11-12 |
Family
ID=6136988
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000407148A Expired CA1196720A (en) | 1981-07-15 | 1982-07-13 | Disc-shaped, optically readable information carrier having high storage density |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0070031A3 (en) |
| JP (1) | JPS5819749A (en) |
| CA (1) | CA1196720A (en) |
| DE (1) | DE3127993A1 (en) |
| MX (1) | MX151592A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5533002A (en) * | 1991-10-19 | 1996-07-02 | Abraham; Nigel C. | Optical data storage compact disc and method for manufacturing the same |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58135041U (en) * | 1982-03-08 | 1983-09-10 | 松下電器産業株式会社 | optical recording and reproducing disk |
| DE3322131A1 (en) * | 1983-06-20 | 1984-12-20 | Polygram Gmbh, 2000 Hamburg | DISK-SHAPED, OPTICALLY READABLE INFORMATION CARRIER WITH PROTECTIVE EDGE |
| US4672600A (en) * | 1983-11-28 | 1987-06-09 | Northern Telecom Limited | Optical disc having protective cover |
| DE3511712C2 (en) * | 1985-03-29 | 1995-09-07 | Polygram Gmbh | Plate-shaped information carrier and method for its production |
| FR2613523B1 (en) * | 1986-03-07 | 1995-02-10 | Sanyo Electric Co | OPTICAL RECORDING DISC |
| KR0185765B1 (en) * | 1993-04-10 | 1999-04-15 | 가와다 미쓰구 | Optical information medium and method for fabricating same |
| DE29619143U1 (en) * | 1996-11-05 | 1997-01-02 | Claußnitzer, Werner, 42329 Wuppertal | Label sheet |
| US6149409A (en) * | 1999-08-02 | 2000-11-21 | Ford Global Technologies, Inc. | Cartridge vane pump with dual side fluid feed and single side inlet |
| US6680898B2 (en) | 2001-02-21 | 2004-01-20 | Todd J. Kuchman | Optical disc and method of protecting same |
| US6842409B2 (en) | 2001-02-21 | 2005-01-11 | Scratch-Less Disc Industries, Llc | Optical disc and method of protecting same |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1221862A (en) * | 1959-01-16 | 1960-06-07 | Manufacturing process of discs with engraved titles | |
| GB1134469A (en) * | 1966-10-07 | 1968-11-27 | Shigeru Inoue & Masamitsu Oki | A method of printing a label on a 7 inch - 45 rpm disc record blank |
| US3689078A (en) * | 1969-06-30 | 1972-09-05 | Yasujiro Ban | Colored recording discs |
| US4066268A (en) * | 1972-04-21 | 1978-01-03 | Ted Bildplatten Aktiengesellschaft Aeg-Telefunken-Teldec | Disc recording provided with legible matter |
| NL161284C (en) * | 1972-09-02 | 1980-01-15 | Philips Nv | DISPLAY SYSTEM FOR AN OPTICALLY READABLE INFORMATION STRUCTURE AND RECORD CARRIAGE FOR USE THEREIN. |
| DE2304723A1 (en) * | 1973-01-31 | 1974-08-08 | Polygram Gmbh | DISC-SHAPED INFORMATION CARRIER, PROCESS AND EQUIPMENT FOR THE PRODUCTION OF IT |
| BR7608803A (en) * | 1976-01-26 | 1977-10-25 | Microsonics Corp | PREVIOUS RECORDING MEDIA AND PROCESS FOR YOUR MANUFACTURE |
| JPS57167148A (en) * | 1981-04-03 | 1982-10-14 | Sony Corp | Optical recording medium |
-
1981
- 1981-07-15 DE DE19813127993 patent/DE3127993A1/en not_active Withdrawn
-
1982
- 1982-07-13 MX MX19358682A patent/MX151592A/en unknown
- 1982-07-13 JP JP57120731A patent/JPS5819749A/en active Pending
- 1982-07-13 CA CA000407148A patent/CA1196720A/en not_active Expired
- 1982-07-13 EP EP82106266A patent/EP0070031A3/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5533002A (en) * | 1991-10-19 | 1996-07-02 | Abraham; Nigel C. | Optical data storage compact disc and method for manufacturing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3127993A1 (en) | 1983-02-10 |
| EP0070031A3 (en) | 1984-11-28 |
| MX151592A (en) | 1984-12-21 |
| JPS5819749A (en) | 1983-02-04 |
| EP0070031A2 (en) | 1983-01-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |