GB2139799A - Data storage discs and methods of manufacturing same - Google Patents

Data storage discs and methods of manufacturing same Download PDF

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Publication number
GB2139799A
GB2139799A GB8312787A GB8312787A GB2139799A GB 2139799 A GB2139799 A GB 2139799A GB 8312787 A GB8312787 A GB 8312787A GB 8312787 A GB8312787 A GB 8312787A GB 2139799 A GB2139799 A GB 2139799A
Authority
GB
United Kingdom
Prior art keywords
rib
film
data storage
supporting sheet
recording 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.)
Withdrawn
Application number
GB8312787A
Other versions
GB8312787D0 (en
Inventor
Jean-Pierre Voiturier
Michel Laurent
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.)
AGC Glass Europe SA
Original Assignee
Glaverbel Belgium SA
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 Glaverbel Belgium SA filed Critical Glaverbel Belgium SA
Priority to GB8312787A priority Critical patent/GB2139799A/en
Publication of GB8312787D0 publication Critical patent/GB8312787D0/en
Publication of GB2139799A publication Critical patent/GB2139799A/en
Withdrawn legal-status Critical Current

Links

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
    • G11B23/0014—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 record carriers not specifically of filamentary or web form
    • G11B23/0021—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 record carriers not specifically of filamentary or web form discs
    • G11B23/0028—Details
    • G11B23/0035—Details means incorporated in the disc, e.g. hub, to enable its guiding, loading or driving
    • 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
    • G11B23/0014—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 record carriers not specifically of filamentary or web form
    • G11B23/0021—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 record carriers not specifically of filamentary or web form discs
    • G11B23/005—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 record carriers not specifically of filamentary or web form discs flexible discs
    • 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
    • G11B7/24018—Laminated discs
    • G11B7/24021—Laminated discs provided with a special shape or structure for centering or eccentricity prevention, e.g. alignment
    • 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

A data storage disc comprises a supporting sheet 1 e.g. of glass having on a front face an annular rib 3 over which is secured a flat stretched film 7 of polymeric material. A recording layer 9 may be applied to the polymeric film 7 over an optional subbing layer 8. In a method of manufacturing such a disc, the polymeric film is secured and then heat shrunk into stretched condition. <IMAGE>

Description

SPECIFICATION Data storage discs and methods of manufacturing same This invention relates to data storage discs and in particular to such discs intended to bear, or bearing, a laser readable record.
Data may be stored on such discs by pit-wise modulating a recording surface which is rendered reflective or by image-wise modulating a dye layer deposited over a reflective subbing layer. In either case for high density data storage it is necessary that the recording layer shall be deposited on a surface which is flat to within very small tolerances, for example less than 1 cm. Such data storage discs have hitherto been made by for example lapping an aluminium substrate to the required degree of flatness.
This is time consuming and costly, and it is an object of the present invention to provide a data storage disc which can be manufactured more economically.
According to the present invention, there is provided a data storage disc characterised in that it comprises a supporting sheet bearing on a front face an annular rib over which is secured a flat stretched film of polymeric material, and the invention includes a method of manufacturing a data storage disc comprising bonding an annular rib to a front face of a supporting sheet, securing a film of polymeric material over said rib and heat-shrinking the film to flat stretched condition.
Thus a data storage disc according to the present invention includes as it were a drum skin of polymeric material held in stretched condition. Heat shrinkable polymeric film is widely available with the required degree of surface uniformity so that in order to achieve a surface of the required flatness it is only necessary to ensure that the top of the annular rib is sufficiently even rather than to lap the whole of the area onto which data is to be recorded as was hitherto the case.
The annular rib may be bonded to the supporting sheet in any convenient manner, for example by the use of adhesives, but it has been found preferable to solder said rib to said supporting sheet since this results in a strong bond which does not readily deteriorate.
Said supporting sheet is preferably of vitreous material. Vitreous material is widely available and inexpensive and is simple to cut into discs. The vitreous material may if desired be laminated and/or it may be tempered, for example chemically tempered. A metallic annulus may readily be deposited on the vitreous material by a technique well known in the hollow glazing panel art in order that said rib may be soldered thereto.
It is preferred that hub member be fixed to the rear face of said sheet in order to define an axis of rotation for use of the data storage disc.
Advantageously, said film is at least in part secured to said rib by the nip of an elastomeric or metal ring. Alternatively, or in addition, it is preferred that said film be at least in part secured to said rib by adhesive.
The use of an elastomeric or metal ring has the advantage of providing a convenient seat for a cover, preferably a glass cover, fitting over said film as provided in some preferred embodiments of the invention.
Advantageously, the film to be secured over said rib bears an information-wise modulatable recording layer.
After stretching the recording layer is advantageously modulated to leave a laser readable record.
The recording layer is preferably deposited on a reflective subbing layer.
A preferred embodiment of the invention will now be described by way of example with reference to the accompanying drawing which shows a data storage disc in elevational cross section.
In the drawing, a supporting sheet 1, of glass, has an annular, marginal metallised strip 2 on its front face to which an annular rib 3 of L-cross-section is bonded by solder 4. The rib 3 may suitably be formed from folded copper strip.
A hub piece 5 for example of a metal such as aluminium, is bonded to the rear face of the supporting sheet 1 by glue 6. The sheet 1 is spun about the axis of the hub member 5 and the upper edge of the rib 3 is lapped to the desired degree of flatness.
Atin film 7 of polymeric material bearing a reflective subbing layer 8 and a developable dye layer 9 is then laid over the rib 3 and is held in position by an elastomeric ring 10. The outer vertical face of the rib 3 may be coated with a suitable adhesive to provide additional security for the polymeric film 7. The elastomeric ring 10 is bonded to the rib 3 and sheet 1 by adhesive 11. Instead of an elastomeric ring 10 it is possible to use a metal ring which may be clamped in place or may be of expansible construction, for example a split ring, so that it is self-clamping.
After the film 7 has been secured in place it is heat shrunk so that it is held in flat stretched condition.
After head shrinking, the dye layer 9 can be exposed to a master record by a contact printing technique and developed to provide a positive image of the master.
Also shown in the drawing is a cover comprising a second glass sheet 12 having a metallised margin 13 to which a rib 14 is secured by solder 15. The rib 14 is of such size as to engage the elastomeric ring 10 so that the cover is held in place by friction.
In the variant method, a polymeric film bearing a metallised reflective layer is secured over the rib 3 and heat-shrunk to flat stretched condition, whereafter a recording layer such as the recording layer 9 is applied to the metallised layer ready for informationwise modulation, for example by photographic exposure.
1. A data storage disc characterised in that it comprises a supporting sheet bearing on a front face an annular rib over which is secured a flat stretched
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (20)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Data storage discs and methods of manufacturing same This invention relates to data storage discs and in particular to such discs intended to bear, or bearing, a laser readable record. Data may be stored on such discs by pit-wise modulating a recording surface which is rendered reflective or by image-wise modulating a dye layer deposited over a reflective subbing layer. In either case for high density data storage it is necessary that the recording layer shall be deposited on a surface which is flat to within very small tolerances, for example less than 1 cm. Such data storage discs have hitherto been made by for example lapping an aluminium substrate to the required degree of flatness. This is time consuming and costly, and it is an object of the present invention to provide a data storage disc which can be manufactured more economically. According to the present invention, there is provided a data storage disc characterised in that it comprises a supporting sheet bearing on a front face an annular rib over which is secured a flat stretched film of polymeric material, and the invention includes a method of manufacturing a data storage disc comprising bonding an annular rib to a front face of a supporting sheet, securing a film of polymeric material over said rib and heat-shrinking the film to flat stretched condition. Thus a data storage disc according to the present invention includes as it were a drum skin of polymeric material held in stretched condition. Heat shrinkable polymeric film is widely available with the required degree of surface uniformity so that in order to achieve a surface of the required flatness it is only necessary to ensure that the top of the annular rib is sufficiently even rather than to lap the whole of the area onto which data is to be recorded as was hitherto the case. The annular rib may be bonded to the supporting sheet in any convenient manner, for example by the use of adhesives, but it has been found preferable to solder said rib to said supporting sheet since this results in a strong bond which does not readily deteriorate. Said supporting sheet is preferably of vitreous material. Vitreous material is widely available and inexpensive and is simple to cut into discs. The vitreous material may if desired be laminated and/or it may be tempered, for example chemically tempered. A metallic annulus may readily be deposited on the vitreous material by a technique well known in the hollow glazing panel art in order that said rib may be soldered thereto. It is preferred that hub member be fixed to the rear face of said sheet in order to define an axis of rotation for use of the data storage disc. Advantageously, said film is at least in part secured to said rib by the nip of an elastomeric or metal ring. Alternatively, or in addition, it is preferred that said film be at least in part secured to said rib by adhesive. The use of an elastomeric or metal ring has the advantage of providing a convenient seat for a cover, preferably a glass cover, fitting over said film as provided in some preferred embodiments of the invention. Advantageously, the film to be secured over said rib bears an information-wise modulatable recording layer. After stretching the recording layer is advantageously modulated to leave a laser readable record. The recording layer is preferably deposited on a reflective subbing layer. A preferred embodiment of the invention will now be described by way of example with reference to the accompanying drawing which shows a data storage disc in elevational cross section. In the drawing, a supporting sheet 1, of glass, has an annular, marginal metallised strip 2 on its front face to which an annular rib 3 of L-cross-section is bonded by solder 4. The rib 3 may suitably be formed from folded copper strip. A hub piece 5 for example of a metal such as aluminium, is bonded to the rear face of the supporting sheet 1 by glue 6. The sheet 1 is spun about the axis of the hub member 5 and the upper edge of the rib 3 is lapped to the desired degree of flatness. Atin film 7 of polymeric material bearing a reflective subbing layer 8 and a developable dye layer 9 is then laid over the rib 3 and is held in position by an elastomeric ring 10. The outer vertical face of the rib 3 may be coated with a suitable adhesive to provide additional security for the polymeric film 7. The elastomeric ring 10 is bonded to the rib 3 and sheet 1 by adhesive 11. Instead of an elastomeric ring 10 it is possible to use a metal ring which may be clamped in place or may be of expansible construction, for example a split ring, so that it is self-clamping. After the film 7 has been secured in place it is heat shrunk so that it is held in flat stretched condition. After head shrinking, the dye layer 9 can be exposed to a master record by a contact printing technique and developed to provide a positive image of the master. Also shown in the drawing is a cover comprising a second glass sheet 12 having a metallised margin 13 to which a rib 14 is secured by solder 15. The rib 14 is of such size as to engage the elastomeric ring 10 so that the cover is held in place by friction. In the variant method, a polymeric film bearing a metallised reflective layer is secured over the rib 3 and heat-shrunk to flat stretched condition, whereafter a recording layer such as the recording layer 9 is applied to the metallised layer ready for informationwise modulation, for example by photographic exposure. CLAIMS
1. A data storage disc characterised in that it comprises a supporting sheet bearing on a front face an annular rib over which is secured a flat stretched film of polymeric material.
2. A disc according to claim 1, wherein said rib is soldered to the supporting sheet.
3. A disc according to claim 1 or 2 wherein said supporting sheet is of vitreous material.
4. A disc according to any preceding claim wherein a hub member is fixed to the rear face of the supporting sheet.
5. A disc according to any preceding claim wherein said film is at least in part secured to said rib by the nip of an elastomeric or metal ring.
6. A disc according to any preceding claim wherein said film is at least in part secured to said rib by adhesive.
7. A disc according to any preceding claim, wherein there is further provided a cover, preferably a glass cover, fitting over said film.
8. A disc according to any preceding claim, wherein said film bears a laser readable informationwise modulated recording layer.
9. A disc according to any of claims 1 to 7, wherein said film bears an information-wise mod ulatable recording layer.
10. A disc according to claim 8 or 9, wherein said recording layer is deposited on a reflective subbing layer.
11. A method of manufacturing a data storage disc comprising bonding an annular rib to a front face of a supporting sheet, securing a film of polymeric material over said rib and heat-shrinking the film to flat stretched condition.
12. A method according to claim 11 wherein said rib is soldered to said supporting sheet.
13. A method according to claim 11 or 12, wherein said supporting sheet is of vitreous material.
14. A method according to any of claims 11 to 13, wherein a hub member is fixed to the rear face of said sheet.
15. A method according to any of claims 11 to 14, wherein said film is at least in part secured to said rib by the nip of an elastomeric or metal ring.
16. A method according to any of claims 11 to 15, wherein said film is at least in part secured to said rib by adhesive.
17. A method according to any of claims 11 to 16, wherein the film to be secured over said rib bears an information-wise modulatable recording layer.
18. A method according to any of claims 11 to 16, wherein after shrinking of the film, an informationwise modulatable recording layer is formed thereon.
19. A method according to claim 17 or 18, wherein after shrinking the recording layer is modulated to leave a laser readable record.
20. A method according to claim 17,18 or 19 wherein the recording layer is deposited on a reflective subbing layer.
GB8312787A 1983-05-10 1983-05-10 Data storage discs and methods of manufacturing same Withdrawn GB2139799A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8312787A GB2139799A (en) 1983-05-10 1983-05-10 Data storage discs and methods of manufacturing same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8312787A GB2139799A (en) 1983-05-10 1983-05-10 Data storage discs and methods of manufacturing same

Publications (2)

Publication Number Publication Date
GB8312787D0 GB8312787D0 (en) 1983-06-15
GB2139799A true GB2139799A (en) 1984-11-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB8312787A Withdrawn GB2139799A (en) 1983-05-10 1983-05-10 Data storage discs and methods of manufacturing same

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5379287A (en) * 1992-06-10 1995-01-03 U.S. Philips Corporation Disc retaining device for a disc player

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1005103A (en) * 1962-12-17 1965-09-22 Buromaschinenwerk Sommerda Veb A magnetic core
GB1168753A (en) * 1967-05-11 1969-10-29 Matsushita Electric Ind Co Ltd Rotary Disc Unit for Use in Magnetic Recording and Reproducing.
GB1321088A (en) * 1970-08-21 1973-06-20 British Broadcasting Corp Magnetic storage device
GB1394713A (en) * 1971-07-23 1975-05-21 Matsushita Electric Ind Co Ltd Magnetic recording devices
GB1547517A (en) * 1976-11-25 1979-06-20 Elektrotechnik Eisenach Veb Support for a foil recording medium
EP0030623A1 (en) * 1979-12-10 1981-06-24 International Business Machines Corporation Methods of fabricating magnetic records, magnetic records so fabricated, and magnetic recording and reproducing apparatus comprising such fabricated magnetic records

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1005103A (en) * 1962-12-17 1965-09-22 Buromaschinenwerk Sommerda Veb A magnetic core
GB1168753A (en) * 1967-05-11 1969-10-29 Matsushita Electric Ind Co Ltd Rotary Disc Unit for Use in Magnetic Recording and Reproducing.
GB1321088A (en) * 1970-08-21 1973-06-20 British Broadcasting Corp Magnetic storage device
GB1394713A (en) * 1971-07-23 1975-05-21 Matsushita Electric Ind Co Ltd Magnetic recording devices
GB1547517A (en) * 1976-11-25 1979-06-20 Elektrotechnik Eisenach Veb Support for a foil recording medium
EP0030623A1 (en) * 1979-12-10 1981-06-24 International Business Machines Corporation Methods of fabricating magnetic records, magnetic records so fabricated, and magnetic recording and reproducing apparatus comprising such fabricated magnetic records

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5379287A (en) * 1992-06-10 1995-01-03 U.S. Philips Corporation Disc retaining device for a disc player

Also Published As

Publication number Publication date
GB8312787D0 (en) 1983-06-15

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)