DE2747797C2 - Pressing device for embossing disc-shaped information carriers with a high storage density - Google Patents

Pressing device for embossing disc-shaped information carriers with a high storage density

Info

Publication number
DE2747797C2
DE2747797C2 DE19772747797 DE2747797A DE2747797C2 DE 2747797 C2 DE2747797 C2 DE 2747797C2 DE 19772747797 DE19772747797 DE 19772747797 DE 2747797 A DE2747797 A DE 2747797A DE 2747797 C2 DE2747797 C2 DE 2747797C2
Authority
DE
Germany
Prior art keywords
die
press plate
information carriers
pressing device
storage density
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
Application number
DE19772747797
Other languages
German (de)
Other versions
DE2747797A1 (en
Inventor
Hermann 3000 Hannover Schaffner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Polygram 2000 Hamburg De GmbH
Original Assignee
Polygram 2000 Hamburg De GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Polygram 2000 Hamburg De GmbH filed Critical Polygram 2000 Hamburg De GmbH
Priority to DE19772747797 priority Critical patent/DE2747797C2/en
Publication of DE2747797A1 publication Critical patent/DE2747797A1/en
Application granted granted Critical
Publication of DE2747797C2 publication Critical patent/DE2747797C2/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/02—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/02—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means
    • B29C33/04—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means using liquids, gas or steam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2909/00—Use of inorganic materials not provided for in groups B29K2803/00 - B29K2807/00, as mould material
    • B29K2909/08—Glass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2017/00—Carriers for sound or information
    • B29L2017/001—Carriers of records containing fine grooves or impressions, e.g. disc records for needle playback, cylinder records
    • B29L2017/003—Records or discs

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Description

Die Erfindung bezieht sich auf eine Preßvorrichtung zum Prägen plattenförmiger, optisch abtastbarer Informationsträger hoher Speicherdichte aus thermoplastischem Material unter Anwendung einer Hochfrequenzheizung, beispielsweise Bild- bzw. Videoplatten, bestehend aus zwei gegeneinander bewegbaren Preßplatten, von denen wenigstens eine eine Matrize tragende Preßplatte einen Formblock bildet.The invention relates to a pressing device for embossing plate-shaped, optically scannable Information carrier of high storage density made of thermoplastic material using high-frequency heating, For example image or video disks, consisting of two press plates that can be moved against one another, of which at least one press plate carrying a die forms a mold block.

Preßvorrichtungen dieser Art sind beispielsweise durch die DE-OS 20 40 288 bekannt. Da das Trägermaterial eine die Prägung aufnehmende Schicht aufweist, die sich aufgrund ihres relativ großen dielektrischen Verlustwinkels im Hochfrequenzfeld rasch aufheizt, kann hier sehr schnell geprägt werden.Pressing devices of this type are known for example from DE-OS 20 40 288. As the carrier material has a layer receiving the embossing, which due to its relatively large dielectric The loss angle heats up quickly in the high-frequency field, can be shaped very quickly here.

Wie die Praxis zeigt, ergibt sich bei der Herstellung von plattenförmigen Informationsträgern für Bild- bzw. Videosignale mit ihrer im Vergleich zu Schallplatten wesentlich höheren Speicherdichte bei Verwendung herkömmlicher Preßplatten aus Stahl das Problem, daß sich bereits geringfügige, durch die Rauhtiefe bedingte Unebenheiten der Preßplattenoberfläche auf der Preßmatrize abbilden und damit die Qualität der gepreßten Informationsträger verschlechtern. Bei optisch abtastbaren Informationsträgern, bei denen der Abtaststrahl exakt in der Informationsebene fokussiert ist, führt dies dann meist zu mehr oder weniger großen Abtastfehlern, die die Wiedergabequalität wesentlich beeinträchtigen können.As practice shows, the production of disc-shaped information carriers for image or Video signals with their significantly higher storage density compared to vinyl records when in use Conventional steel press plates have the problem that there is already a slight one caused by the surface roughness Map unevenness of the press plate surface on the press die and thus the quality of the worsen compressed information carriers. In the case of optically scannable information carriers where the Scanning beam is focused exactly in the information plane, this then usually leads to more or less large ones Sampling errors that can significantly affect the playback quality.

Der Erfindung liegt nun die Aufgabe zugrunde, einen Formblock zum Prägen plattenförmiger Informationsträger zu schaffen, bei dem die ebene Oberfläche der Preßplatte eine möglichst geringe Rauhtiefe besitztThe invention is now based on the object of providing a mold block for embossing plate-shaped information carriers to create, in which the flat surface of the press plate has the lowest possible surface roughness

Diese Aufgabe wird durch die kennzeichnenden Merkmale des Anspruchs gelöstThis object is achieved by the characterizing features of the claim

Durch die DE-PS 5 56 903 ist es zwar zum Herstellen von Gegenständen aus Kunstharz bekannt PreßformenFrom DE-PS 5 56 903 it is known for the manufacture of objects from synthetic resin compression molds

ίο aus Glas zu verwenden. Eine Metallmatrize ist hier nicht vorgesehen. Auch weist diese Preßform keine Heizung auf.ίο to use made of glass. There is no metal die here intended. This mold also has no heating.

Die durch die US-PS 23 41 617 bekannte Preßvorrichtung besitzt Formhälften aus Glas, in die Elektroden zum dielektrischen Erhitzen des thermoplastischen Werkstoffs eingeschmolzen sind. Sie dient aber nicht zum Prägen von plattenförmigen Informationsträgern.The known from US-PS 23 41 617 pressing device Has mold halves made of glass, in which electrodes for dielectric heating of the thermoplastic Material are melted. However, it is not used for embossing plate-shaped information carriers.

Im folgenden wird die Erfindung anhand derIn the following the invention is based on the

Zeichnung näher erläutertDrawing explained in more detail

Die Figur zeigt in einer Schnittdarstellung einen Formblock für eine Presse, bestehend aus einer Preßplatte 1 und daran angebrachter Matrize 3. Die Preßplatte 1 weist in ihrem Innern mehrere zu einem geschlossenen Kühlsystem zusammengefaßte Kühlkanäle 2 auf, in denen Kühlflüssigkeit, z. B. Wasser umläuft. Die Preßplatte 1 selbst besteht aus einem gegossenen Glaskörper, dessen planparallele Ober- und Unterflächen in vorteilhafter Weise sehr glatt geschliffen werden können, wobei eine Oberflächenrauhigkeit RA von etwa 0,02 μπι erreicht wird. Hinsichtlich der erforderlichen Druckfestigkeit der Preßplatte 1 ergeben sich keinerlei Schwierigkeiten, da die Druckfestigkeit bautechnischer Gläser bekanntlich sehr hoch ist und durchaus Werte von ca. 7000 bar erreicht. Die an der Unterseite der Preßplatte 1 befestigte Matrize 3 weist eine dem Informationsträger entsprechende mikroskopisch feine Oberflächenstruktur auf. Zur Beheizung der Matrize 3 dient ein elektrisches Heizsystem, dessen Drähte 4 aus Gründen bester Energieausnutzung inThe figure shows a sectional view of a mold block for a press, consisting of a press plate 1 and a die 3 attached to it. B. Circulating water. The press plate 1 itself consists of a cast glass body, the plane-parallel upper and lower surfaces of which can be ground very smooth in an advantageous manner, a surface roughness RA of about 0.02 μm is achieved. With regard to the required compressive strength of the press plate 1, there are no difficulties whatsoever, since the compressive strength of structural glass is known to be very high and certainly reaches values of approx. 7000 bar. The die 3 attached to the underside of the press plate 1 has a microscopically fine surface structure corresponding to the information carrier. An electrical heating system is used to heat the die 3

■so unmittelbarer Nähe der Matrize angeordnet sind, so daß die Hochfrequenzenergie nahezu ausschließlich in der Matrize verbraucht wird. Dies insbesondere deshalb, weil die aus Glas bestehende Preßplatte bekanntlich thermisch sehr träge ist und daher kaum Wärmeenergie■ are arranged so close to the die, so that the high-frequency energy is almost exclusively consumed in the die. This is especially because because the pressing plate made of glass is known to be thermally very inert and therefore hardly any heat energy

aufnimmt. Temperaturbedingte Spannungen im Glaskörper sind nicht von Bedeutung, da der Glaskörper permanent mit Kühlwasser gekühlt wird. Die Drähte des Heizsystems sind unmittelbar bei der Herstellung des Glaskörpers in diesen eingeschmolzen.records. Temperature-related tensions in the vitreous body are not important because the vitreous body is permanently cooled with cooling water. The wires of the heating system are in the process of being manufactured of the vitreous melted into this.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims (1)

Patentanspruch:Claim: Preßvorrichtung zum Prägen plattenförmiger optisch abtastbarer Informationsträger hoher Speicherdichte aus thermoplastischem Material unter Anwendung einer Hochfrequenzheizung, beispielsweise Bild- bzw. Videcplatten, bestehend aus zwei gegeneinander bewegbaren Preßplatten, von denen wenigstens eine eine Matrize tragende Preßplatte einen Formblock: bildet, dadurch gekennzeichnet, daß die die Matrize tragende Preßplatte (1) aus Glas besteht, daß in die Preßplatte (1) Drähte (4) in unmittelbarer Nähe der Matrize (3) für eine Hochfrequenzheizung der Matrize (3) eingebettet sind und daß im Innern der Preßplatte (1) mehrere zu einem geschlossenen Kühlsystem zusammengefaßte Kanäle (2) vorgesehen sind, in denen eine Kühlflüssigkeit zirkuliertPressing device for embossing plate-shaped optically scannable information carriers high Storage density of thermoplastic material using high frequency heating, for example Image or Videc plates, consisting of two mutually movable press plates, of which at least one press plate carrying a die forms a mold block: thereby characterized in that the press plate (1) carrying the die consists of glass that is inserted into the press plate (1) Wires (4) in the immediate vicinity of the die (3) for high-frequency heating of the die (3) are embedded and that in the interior of the press plate (1) several to form a closed cooling system combined channels (2) are provided in which a cooling liquid circulates
DE19772747797 1977-10-25 1977-10-25 Pressing device for embossing disc-shaped information carriers with a high storage density Expired DE2747797C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19772747797 DE2747797C2 (en) 1977-10-25 1977-10-25 Pressing device for embossing disc-shaped information carriers with a high storage density

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19772747797 DE2747797C2 (en) 1977-10-25 1977-10-25 Pressing device for embossing disc-shaped information carriers with a high storage density

Publications (2)

Publication Number Publication Date
DE2747797A1 DE2747797A1 (en) 1979-04-26
DE2747797C2 true DE2747797C2 (en) 1982-04-01

Family

ID=6022189

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19772747797 Expired DE2747797C2 (en) 1977-10-25 1977-10-25 Pressing device for embossing disc-shaped information carriers with a high storage density

Country Status (1)

Country Link
DE (1) DE2747797C2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8304399A (en) * 1983-12-22 1985-07-16 Philips Nv ALTERNATING HEATABLE AND COOLABLE PRESS BLOCK.
US4876042A (en) * 1987-12-28 1989-10-24 Canon Kabushiki Kaisha Molding processing using a reproducible molding die
FR2638016A1 (en) * 1988-10-18 1990-04-20 Kodak Pathe METHOD FOR SURFACE TREATMENT OF MAGNETIC LAYERS
SE9402085L (en) * 1994-06-14 1995-07-17 Ericsson Telefon Ab L M Apparatus for pressing plastics

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE556903C (en) * 1930-10-10 1932-08-16 Carl Lieb Pressing device for the production of objects from synthetic resin or similar thermo-plastic masses
US2341617A (en) * 1936-01-09 1944-02-15 Western Electric Co Method of and apparatus for molding
DE2040288A1 (en) * 1970-08-13 1972-02-17 Licentia Gmbh Sandwich record support - with polyethylene carrier and pvc imprinting foil

Also Published As

Publication number Publication date
DE2747797A1 (en) 1979-04-26

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OD Request for examination
D2 Grant after examination
8339 Ceased/non-payment of the annual fee