DE2048431B2 - Method for recording information, preferably of such a large bandwidth in the range of several MHz, on a carrier - Google Patents
Method for recording information, preferably of such a large bandwidth in the range of several MHz, on a carrierInfo
- Publication number
- DE2048431B2 DE2048431B2 DE2048431A DE2048431A DE2048431B2 DE 2048431 B2 DE2048431 B2 DE 2048431B2 DE 2048431 A DE2048431 A DE 2048431A DE 2048431 A DE2048431 A DE 2048431A DE 2048431 B2 DE2048431 B2 DE 2048431B2
- Authority
- DE
- Germany
- Prior art keywords
- carrier
- recording
- information
- layer
- electron
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 4
- 238000005530 etching Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910052797 bismuth Inorganic materials 0.000 claims description 2
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims description 2
- 229910052793 cadmium Inorganic materials 0.000 claims description 2
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims description 2
- 239000012876 carrier material Substances 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 239000011777 magnesium Substances 0.000 claims description 2
- 239000011159 matrix material Substances 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910052709 silver Inorganic materials 0.000 claims description 2
- 239000004332 silver Substances 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 239000011701 zinc Substances 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims 1
- 230000008020 evaporation Effects 0.000 claims 1
- 238000001704 evaporation Methods 0.000 claims 1
- 238000007373 indentation Methods 0.000 claims 1
- 239000007788 liquid Substances 0.000 claims 1
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
Classifications
-
- 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
- G11B23/0057—Intermediate mediums, i.e. mediums provided with an information structure not specific to the method of reproducing or duplication such as matrixes for mechanical pressing of an information structure ; record carriers having a relief information structure provided with or included in layers not specific for a single reproducing method; apparatus or processes specially adapted for their manufacture
-
- 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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
-
- 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
-
- 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
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
-
- 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
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
-
- 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
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
- G11B7/2532—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising metals
Description
Die Hauptanmeldung P 20 38874.3 betrifft ein Verfahren zum Aufzeichnen von Informationen, vorzugsweise von solchen großer Bandbreite im Bereich von mehreren MHz, auf einem, vorzugsweise mit spiralförmig verlaufenden Rillen versehenen Träger durch Abtragung oder mechanische Verformung seiner Oberfläche und zum Auslesen solcher Informationen. The main application P 20 38874.3 relates to a method for recording information, preferably of such a large bandwidth in the range of several MHz, on one, preferably with a spiral extending grooves provided by the abrasion or mechanical deformation of its carrier Surface and for reading out such information.
Die wesentlichen Merkmale der Hauptanmeldung bestehen darin, daß die Abtragung oder Verformung der Trägeroberfläche durch einen mit den aufzuzeichnenden Informationen modulierten Elektronen- oder Laserstrahl und das Auslesen der gespeicherten Informationen aus dieser Trägeroberfläche oder aus von ihr erzeugten Abdrucken durch mechanische Abtastung erfolgt. Es ist dabei insbesondere an die Auslesung dieser gespeicherten Informationen mit Hilfe eines auf Druckänderungen ansprechenden Abtasters gedacht, wobei der zur Verwendung kommende Träger sowie dieser Druckabtaster derart ausgebildet sein sollen, daß die durch die Druckkraft bewirkte elastische Formänderung der die Informationen enthaltenden Trägeroberfläche wesentlich größer ist als dieThe main features of the main application are that the removal or deformation the carrier surface by an electron or electron beam modulated with the information to be recorded Laser beam and the reading out of the stored information from this carrier surface or from their imprints are produced by mechanical scanning. It is particularly concerned with the reading this stored information with the aid of a scanner responsive to pressure changes thought, the coming to use carrier as well as this pressure scanner be designed in such a way should that the elastic change in shape caused by the compressive force of the information containing Support surface is much larger than that
korrespondierende, auf der Zusammendrückung beruhende Auslenkung der Berührungsfläche des Abtasters. corresponding deflection of the contact surface of the scanner based on the compression.
In der Hauptanmeldung ist eine Reihe von Vorschlägen angegeben, nach denen die AufzeichnungIn the main application a number of proposals are given, after which the record
ίο der Information auf den Träger erfolgen soll.ίο the information should be sent to the carrier.
Der Erfindung liegt die Aufgabe zugrunde, das Problem der Vervielfachung solcher Aufzeichnungsträger zu vereinfachen. Es wird daher gemäß der Erfindung vorgeschlagen, bei der Ausführung des Ver-The invention is based on the problem of the multiplication of such record carriers to simplify. It is therefore proposed according to the invention, when executing the
fahrens nach der hauptanmeldung zur Aufzeichnung einen als Matrize verwendbaren Träger mit vorgeformten Rillen zur Führung des Aufzeichnungskopfes zu verwenden, auf dessen Oberfläche eine Schicht eines durch den auftreffenden Elektronen- oder Laserstrahl leicht verdampf baren Metalls aufgebracht ist. Der Träger, auf dem die Information, z. B. als Frequenzmodulation einer Trägerschwingung, aufgezeichnet ist, kann nun einerseits sofort zur Herstellung von einer Anzahl entsprechender Abdiucke verwen-According to the main application for recording, a carrier that can be used as a matrix with pre-formed To use grooves to guide the recording head, on the surface of which a layer of easily vaporizable metal is applied by the impinging electron or laser beam. The carrier on which the information, e.g. B. recorded as frequency modulation of a carrier wave is, on the one hand, can now be used immediately to produce a number of corresponding prints.
det werden, andererseits kann die die Information tragende Schicht, z. B. bei einer Fehlaufzeichnung, leicht abgelöst werden, um durch eine neue Aufzeichnungsschicht ersetzt zu werden. Die Ablösung kann durch Ätzen mit einem Material erfolgen, welches den eigentlichen Träger nicht angreift.on the other hand, the layer carrying the information, e.g. B. in the case of a misrecording, easily peeled off to be replaced with a new recording layer. The detachment can through Etching done with a material that does not attack the actual carrier.
Der besondere Vorteil der Erfindung besteht also in der Wiederverwendung des Trägers. Diese Möglichkeit der Wiederverwendung ist besonders wichtig, wenn der Träger bereits mit Führungsrillen versehenThe particular advantage of the invention consists in the reuse of the carrier. This possibility Reuse is especially important if the carrier is already grooved
ist, die zur exakten Führung des Aufzeichnungskopfes dienen. Es sei in diesem Zusammenhang noch erwähnt, daß das Vorschneiden einer Führungsrille deshalb besonders zu empfehlen ist, weil damit eine erhebliche Materialverformung verbunden ist, die nunmehr während des Aufzeichnungsvorganges nicht noch zusätzlich durchgeführt werden muß.which are used for the precise guidance of the recording head. It should be mentioned in this context, that the pre-cutting of a guide groove is particularly recommended because it is a considerable one Material deformation is connected, which now does not occur during the recording process still has to be carried out.
Den Aufzeichnungsstrahl wird man zweckmäßigerweise derart fokussieren, daß ein strichförmiger Fokus mit seiner Hauptausdehnung senkrecht zur Rillenlängsrichtung entsteht; die den Elektronen- oder Laserstrahl erzeugende Anordnung bzw. die Fokussiereinrichtung wird dann derart geführt, daß der Strahlfokus jeweils den zwischen zwei benachbarten Rillen liegenden Steg überdeckt. Auf diesen Steg wird dann die Information mit Hilfe des Elektronen- oder Laserstrahles aufgebracht.The recording beam will expediently be focused in such a way that a line-shaped focus arises with its main extent perpendicular to the longitudinal direction of the groove; the electron or laser beam generating arrangement or the focusing device is then guided in such a way that the Beam focus covers the web lying between two adjacent grooves. On this jetty is then the information is applied with the help of the electron or laser beam.
Eine Ausführungsform dieser Erfindung ist in der Zeichnung dargestellt.An embodiment of this invention is shown in the drawing.
In Fi g. 1 sind in einem senkrecht durch einen Aufzeichnungsträger gelegten Schnitt verschiedene Beispiele für die Form solcher Führungsrillen angegeben. Von der rechteckigen Führungsrille nach α über die halbrunden Führungsrillen b und c sind auch keilförmige Führungsrillen nach d oder winkelförmige Führungsrillen nach e denkbar.In Fi g. 1, various examples of the shape of such guide grooves are given in a section taken vertically through a recording medium. From the rectangular guide groove to α via the semicircular guide grooves b and c , wedge-shaped guide grooves according to d or angular guide grooves according to e are also conceivable.
In F i g. 2 ist eine Aufsicht auf einen Ausschnitt eines solchen Trägers und in Fig. 3 ein dazu senkrecht verlaufender Schnitt in stark vergrößertem Maßstab dargestellt. Der Träger selbst ist mit 5 bezeichnet. Man erkennt in seiner Oberfläche zwei Rillen 1 und 2 und einen dazwischen liegenden Steg 3. Der Aufzeichnungsstrahl trifft mit einem mehr oder weniger strichförmigen Fokus 4 auf den Träger auf, und zwar genauIn Fig. FIG. 2 is a plan view of a section of such a carrier and, in FIG. 3, a view perpendicular thereto running section shown on a greatly enlarged scale. The carrier itself is denoted by 5. Man recognizes two grooves 1 and 2 and a ridge 3 in between in its surface. The recording beam hits the carrier with a more or less line-shaped focus 4, precisely
auf den Steg 3. Wird der Träger in Richtung der Rillenlängsrichtung unter dem mit der information modulierten Aufzeichnungsstrahl vorbeibewegt, so werden aus der Oberfläche des Steges 3 bzw. aus der auf seiner Oberfläche aufgebrachten Schicht 16 Teile verdampft, so daß entsprechend der perspektivischen Darstellung nach Fig. 4 Erhebungen 6 stehenbleiben. on the web 3. Will the carrier in the direction of the longitudinal direction of the groove moved under the recording beam modulated with the information, so parts evaporated from the surface of the web 3 or from the layer 16 applied to its surface, so that, in accordance with the perspective illustration according to FIG. 4, elevations 6 remain.
Mit dieser Matrize können dann ohne weiteres Abdrucke hergestellt werden, die das Aussehen der in Fig. 5 dargestellten Anordnung haben. Man erkennt aus der Gegenüberstellung von Fig. 4 und 5, daß an Stelle der Rillen 1 und 2 nunmehr Erhebungen 8 und 9 auf dem Träger vorhanden sind, zwischen denen sich die die Informationen enthaltenden Erhebungen 7 befinden. Diese Erhebungen 7 liegen nun aber geschützt zwischen den Erhebungen 8 und 9, was als wesentlicher Vorteil dieser Aufzeichnungsmethode angesehen wird. Ein Abtaster für die die Information enthaltenden Erhebungen 7 muß schmaler sein als der Abstand zwischen den beiden Stegen 8 und 9. Er wird zwischen diesen beiden Stegen beim Abtasten geführt.This die can then easily be used to produce impressions that have the appearance of the in Fig. 5 have the arrangement shown. It can be seen from the comparison of FIGS. 4 and 5 that Place the grooves 1 and 2 now elevations 8 and 9 are present on the carrier, between which the surveys 7 containing the information are located. These elevations 7 are now protected between elevations 8 and 9, which is viewed as a major advantage of this recording method will. A scanner for the elevations 7 containing the information must be narrower than that Distance between the two webs 8 and 9. It is guided between these two webs during scanning.
Verwendet man dreieckige Rillen gemäß Fig. Ie, so stoßen die Rillen unmittelbar aneinander. Die Beschriftungerfolgt auch hier in dem Steg, der nun eben J falls Dreieckprofil aufweist. Solche Profile sind in Fig. 6 und 7 dargestellt.If one uses triangular grooves according to Fig. Ie, so the grooves butt directly against one another. The labeling takes place also here in the web, which now also has a triangular profile if just J. Such profiles are in 6 and 7 shown.
Als Trägermaterial kann man für diese Aufzeichnungsmethode ein Metall, z. B. Nickel, Silber, Kupfer oder auch Keramik, verwenden. Die auf seine Oberfläche aufgebrachte Schicht besteht zweckmäßigerweise aus Magnesium, Cadmium, Zink, Blei, Wismuth afte Abwandlung des beschriebenenThe carrier material for this recording method can be a metal, e.g. B. nickel, silver, copper or use ceramics. The layer applied to its surface is expedient from magnesium, cadmium, zinc, lead, bismuth afte modification of the described
gebrachte Schicht aus einembrought layer of one
, 500 A dicke, die Trägeroberiläche bedeckende, 500 A thick, covering the carrier surface
entsprechende, die Informationen darstellende Verao Sngen und Erhebungen, die mit ^amschen corresponding ver ao sngs and surveys that represent the information, starting with ^ amschen
Mitteln gemäß der Hauptanmeldung abtastbar sind. An Stelle einer solchen Ausätzung kann man aberMeans according to the main application are scannable. Instead of such an etching, one can
auch auf galvanischem Wege Erhebungen wachsenelevations also grow galvanically
fassen In diesem Fall muß allerdings die aufgebrachte und Sem Aufzeichnungsstrahl ausgesetzte Schacht soIn this case, however, must be the angry and the shaft exposed to the recording beam so
beschaffen sein, daß an den verbleibenden Schicht-be such that on the remaining shift
stellen kein Anwachsen erfolgt.represent no growth takes place.
Diese beiden letztgenannten Abwandlungen derThese last two modifications of the
Erfindung sind allerdings auch dann vorteilhaft anwendbar, wenn man einen Aufzeichnungsträger ohneHowever, the invention can also be used advantageously if you have a recording medium without
vorgeschnittene Führungsrillen verwendet.pre-cut guide grooves used.
Hierzu 1 Blatt Zeichnungen1 sheet of drawings
Claims (4)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2048431A DE2048431B2 (en) | 1970-08-05 | 1970-10-02 | Method for recording information, preferably of such a large bandwidth in the range of several MHz, on a carrier |
| DE19712118170 DE2118170A1 (en) | 1970-08-05 | 1971-04-15 | Recording information - using vapour electroless or electro-plated support abraded by laser or electron beams |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19702038874 DE2038874B2 (en) | 1970-08-05 | 1970-08-05 | Method for recording signals on a memory |
| DE2048431A DE2048431B2 (en) | 1970-08-05 | 1970-10-02 | Method for recording information, preferably of such a large bandwidth in the range of several MHz, on a carrier |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DE2048431A1 DE2048431A1 (en) | 1972-04-06 |
| DE2048431B2 true DE2048431B2 (en) | 1974-01-10 |
| DE2048431C3 DE2048431C3 (en) | 1979-07-05 |
Family
ID=25759543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE2048431A Granted DE2048431B2 (en) | 1970-08-05 | 1970-10-02 | Method for recording information, preferably of such a large bandwidth in the range of several MHz, on a carrier |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE2048431B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2509891A1 (en) * | 1981-07-17 | 1983-01-21 | Thomson Csf | OPTICAL RECORDING-READING DEVICE ON PREGRAVE INFORMATION MEDIUM |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3842194A (en) * | 1971-03-22 | 1974-10-15 | Rca Corp | Information records and recording/playback systems therefor |
| FR2214934B1 (en) * | 1973-01-18 | 1978-03-24 | Thomson Csf | |
| NL174591C (en) * | 1973-02-09 | 1984-07-02 | Philips Nv | DISC REGISTRATION CARRIER BODY. |
| FR2365854A1 (en) * | 1976-09-24 | 1978-04-21 | Thomson Brandt | METHOD OF MANUFACTURING AN OPTICALLY RECORDABLE AND READABLE INFORMATION MEDIA AND MEDIA OBTAINED BY SUCH A PROCESS |
| NL7802860A (en) * | 1978-03-16 | 1979-09-18 | Philips Nv | REGISTRATION CARRIER BODY AND REGISTRATION CARRIER FOR OPTICAL INFORMATION AND DEVICE FOR REGISTRATION AND READ OUT. |
| CA1165871A (en) * | 1978-11-08 | 1984-04-17 | Kornelis Bulthuis | Optically inscribable record carrier |
| DE3033069A1 (en) * | 1980-09-03 | 1982-04-22 | Ibm Deutschland Gmbh, 7000 Stuttgart | RECORD CARRIER FOR ELECTRIC EROSION PRINTER |
| DE3724622A1 (en) * | 1986-07-25 | 1988-01-28 | Ricoh Kk | Optical information storage medium |
| US5270990A (en) * | 1986-08-15 | 1993-12-14 | Canon Kabushiki Kaisha | Tracking error signal detecting apparatus using an electron beam and apparatus for effecting recording/reproduction of information by the utilization of a plurality of electron beams |
| US5166921A (en) * | 1987-06-17 | 1992-11-24 | Pioneer Electronic Corporation | Optical disk carrying tracking information in multiple formats and apparatus for analyzing same |
| JPS63313331A (en) * | 1987-06-17 | 1988-12-21 | Pioneer Electronic Corp | Optical disk |
-
1970
- 1970-10-02 DE DE2048431A patent/DE2048431B2/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2509891A1 (en) * | 1981-07-17 | 1983-01-21 | Thomson Csf | OPTICAL RECORDING-READING DEVICE ON PREGRAVE INFORMATION MEDIUM |
| EP0070761A1 (en) * | 1981-07-17 | 1983-01-26 | Thomson-Csf | Optical record-playback device for a pre-recorded information carrier |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2048431A1 (en) | 1972-04-06 |
| DE2048431C3 (en) | 1979-07-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| BI | Miscellaneous see part 2 | ||
| BI | Miscellaneous see part 2 | ||
| C3 | Grant after two publication steps (3rd publication) | ||
| 8339 | Ceased/non-payment of the annual fee |