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
  • G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
  • G11B3/68—Record carriers
  • G11B3/685—Intermediate mediums

Definitions

• the invention relates to a method for producing a recorded plate-shaped die according to the preamble of claim 1.
• the invention further relates to a pre-recorded plate-shaped die and an unrecorded information carrier according to the preambles of claims 10 and 11.
• the handling of a CD is easier than that of a conventional record because the surface of a CD is relatively insensitive.
• the non-contact scanning with the help of a laser offers further advantages.
• CD-record is much more complicated than the production of an analog record.
• the devices used in the prior art require the use of "pure bouquets" so that there is no risk that dust particles will unreasonably impair the production process of a plate.
• the so-called CD master is usually produced in the following steps: a highly polished glass plate is first subjected to a visual inspection, then cleaned and provided with an adhesive layer. A photoresist layer is applied to this adhesive layer, its thickness of 0.1 ⁇ corresponds exactly to the depth of the signal track on the finished CD disk in order to enable reading with the aid of a laser beam. The coated glass plate is then checked again and preserved.
• the information signal is then recorded with the aid of a laser beam, so that the exposure points can be washed out in the subsequent developer process.
• the process of washing the alias is controlled by a laser beam until the desired pit structure is reached.
• the developed photoresist layer is provided with a thin silver layer around the To enable electroplating of a carrier material.
• the glass carrier can be removed, so that after the unexposed photoresist layer has been removed further, the final matrix (father) is present, which in conventional steps allows duplication for further processing in subsequent stages.
• the invention is based on the object of specifying a method which considerably simplifies the production of matrices, in particular for digital record recording, which is suitable for laser reading, makes several intermediate stages of production according to the prior art superfluous and, overall, improves Quality of the recording made possible.
• a further task consists in specifying recorded matrices and blank information carriers which are insensitive and storable and have good recording properties.
• an information carrier layer preferably made of copper, is evaporated onto a glass carrier, preferably after applying a tin bronze separating layer.
• the information signal is then recorded directly on this information carrier layer.
• another metal layer - preferably gold - and a carrier material, which preferably consists of nickel, is applied to this information carrier layer by electroplating.
• the glass carrier can then be easily mechanically detached from the sandwich for reuse.
• the detached sandwich cannot yet be used directly for the duplication, but rather forms an intermediate stage.
• this intermediate stage is particularly suitable for storage and transport, since it offers no access to the information signal of the information carrier layer, since the area containing the information is embedded on both sides in metal layers.
• the information carrier layer preferably consists of copper, to which an intermediate layer of noble metal, preferably gold or platinum, is applied, the recording layer can be removed in a simple iron (III) chloride bath without the noble metal layer being attacked becomes. Because of the direct galvanic impression on the information carrier layer, the noble metal layer is a true representation of the recorded signal structure. Deductions can then be made from this father die (mother dies or press dies). However, the father matrix can also be used directly as a press matrix. The invention is explained in more detail below on the basis of an exemplary embodiment.
• Fig. 1 shows a representation of a die according to the prior art in cross section
• Fig. 2 shows a representation of the die according to the invention in
• FIG. 1 The layer structure of a die according to the prior art results from FIG. 1 (not to scale).
• an adhesive layer 2 is first applied, followed by a photoresist layer "3.
• the photoresist layer is applied l ⁇ m in a thickness of 0th the information signal is isthus In this Fotores' imprinted by means of a laser beam, so that per se
• a silver layer 4 must be applied, which is suitable for the galvanic growth of the nickel layer 5 produces the necessary conductivity of the surface.
• the glass carrier can then be detached from the photoresist layer, so that the residues of the photoresist layer are removed from the glass carrier together with the adhesive layer or from the silver layer 4 by suitable solvents.
• the signal drawing is now in a raised form as a negative and can be reproduced in subsequent electroplating stages.
• the task of the adhesive layer 2 is essentially to give the photoresist layer on the one hand a better adhesive base to the glass, in order not to apply one later N ickel für and thereby induced voltages peeling of the photoresist layer to cause, on the other hand, in the application of the silver layer 4 to prevent the strike-through to the glass surface, since otherwise the Silber ⁇ layer would adhere to the glass surface.
• Matrices produced in this way are relatively prone to errors, so that a high reject rate occurs.
• FIG. 2 shows a cross section through a die according to the invention in a cross-sectional representation that is not to scale.
• a thin tin bronze layer with a thickness of about 20 n is first vapor-deposited in a high vacuum on a glass carrier 6 with a thickness of 6-8 mm.
• a pure copper layer is deposited thereon in a high vacuum with a thickness of approximately 100-300 nm. The copper applied in this way is sufficiently ductile to enable an information signal to be cut or impressed.
• DE-P 35 27 606 specifies methods and devices for recording an information signal which are suitable for impressing a signal into an information carrier according to the invention.
• the galvanic application is preferably carried out in a gold layer with a thickness of approximately 5 ⁇ m.
• the gold layer 9 completely levels the incised information pits.
• a complete protection of the recording has already been achieved at the aiesero stage.
• the carrier layer 10 made of winding can now be applied galvanically.
• the nickel layer with a thickness of 0.2 mm serves as a carrier material for the recorded information.
• the sandwich can be stored for a long time, but the glass plate can also first be pulled off for further use along the tin bronze layer 7.
• the tin bronze layer 7 enables the sandwich to be easily mechanically separated from the glass plate, on the other hand it ensures sufficient adhesion of the information carrier layer to the glass plate.
• the sandwich is preferably stored or transported in this intermediate stage (without glass carrier). It is not possible to damage the surface of the Au drawing layer.
• the copper layer used for cutting or embossing the information can be etched off in a simple iron (III) chloride bath.
• a little hydrochloric acid is preferably added to this bath.
• a suitable batch of such a bath contains 50 g FeCls x 6 H 2 0.25 ml HC1 (25), 1 1 H2O.
• the iron-III-chloride bath cannot attack the intermediate layer 9 made of noble metal, namely gold or platinum or another noble metal, only the copper layer is etched away. The recorded information signal therefore emerges in the gold layer without any mechanical damage or change in shape. The copper layer is completely removed by the iron III chloride bath.
• the stamping or cutting of the information signal into the copper layer 8 enables a high degree of accuracy.
• the direct recording of the information signal by mechanical means allows at the same time to carry out a signal control during the recording, e.g. B. with the help of a laser beam so that it can be immediately recognized whether there are any errors in the recording. No subsequent development process is therefore necessary for testing. This already results in a high level of safety and time savings for the production of such a die.
• the recording process does not require any • . Clean room conditions.
• the galvanic process steps required for the specified method can also be carried out under the cleanliness conditions previously customary in record technology.
• the etching away of the cutting layer from the gold layer offers the particular advantage that no mechanical separation has to be carried out on the cutting layer and therefore voltage problems and damage can be avoided, as can occur with the matrices of analog records.
• the separating layer 7 has good adhesion with respect to the cutting layer 8, so that no residues remain on the glass carrier when the glass carrier is separated from the die.

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• Manufacturing Optical Record Carriers (AREA)

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• 1986
  • 1986-02-11 DE DE19863604237 patent/DE3604237A1/de active Granted
• 1987
  • 1987-01-31 AU AU69374/87A patent/AU6937487A/en not_active Abandoned
  • 1987-01-31 WO PCT/DE1987/000038 patent/WO1987004837A1/de not_active Ceased
  • 1987-01-31 JP JP62500974A patent/JPS63502703A/ja active Pending
  • 1987-01-31 EP EP87730010A patent/EP0233138A1/de not_active Withdrawn
  • 1987-02-10 US US07/012,899 patent/US4814047A/en not_active Expired - Fee Related
  • 1987-10-06 DK DK522287A patent/DK522287A/da not_active Application Discontinuation

Patent Citations (2)

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