WO1991010233A1 - Anneaux protecteurs de stabilisation et d'amortissement des vibrations pour disques optiques - Google Patents

Anneaux protecteurs de stabilisation et d'amortissement des vibrations pour disques optiques Download PDF

Info

Publication number
WO1991010233A1
WO1991010233A1 PCT/US1991/000108 US9100108W WO9110233A1 WO 1991010233 A1 WO1991010233 A1 WO 1991010233A1 US 9100108 W US9100108 W US 9100108W WO 9110233 A1 WO9110233 A1 WO 9110233A1
Authority
WO
WIPO (PCT)
Prior art keywords
disc
ring
lips
combination
information
Prior art date
Application number
PCT/US1991/000108
Other languages
English (en)
Inventor
Steven C. Sims
Original Assignee
Sims Steven C
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 Sims Steven C filed Critical Sims Steven C
Publication of WO1991010233A1 publication Critical patent/WO1991010233A1/fr

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/02—Details
    • 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
    • G11B33/02—Cabinets; Cases; Stands; Disposition of apparatus therein or thereon
    • G11B33/08—Insulation or absorption of undesired vibrations or sounds
    • 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

Definitions

  • the present invention relates to novel rings which can be assembled to optical discs to protect them from damage and to facilitate the retrieval of data from the disc by stabilizing it and by damping mechanical vibrations in the disc as it is spun. And, in a second aspect, the present invention relates to the provision of optical discs which are protected from damage during handling and otherwise and which are so stabilized and damped as they are spun that all of the data encoded thereon can be retrieved from the disc.
  • Optical discs with information recorded on one or both sides have come to be used for a variety of purposes, most notably in the music and video industries and as read only computer memories.
  • CD Compact disc
  • the use made of such discs by the music industry is exemplary.
  • Digital information from which an audio signal can be derived is stored on the disc (known as a "compact disc” or CD) in the form of pits arranged along circular, concentric tracks on one side of the disc; and the disc is read — i.e., scanned and the pits detected — with a laser beam as the disc is spun.
  • the digital output from the laser reader is processed through a digital-to-analog converter and other circuits and thus converted to an audio signal which can be used to drive speakers, headphones, etc.
  • a compact disc player uses a laser beam to read the data from the disc in a manner which eliminates physical, pickup-to-disc contact, it uses several servo systems to provide the necessary physical relationships between the laser beam and the disc being read.
  • a focusing servo keeps the laser beam correctly focused so that the pickup can detect the information-related pits on the disc.
  • a tracking servo keeps the pickup over the correct pit track.
  • a CLV servo maintains a constant linear velocity between the laser beam and the track being read by controlling the spindle speed of the motor which rotates the disc.
  • this ring addresses many of the problems encountered in stabilizing an optical disc, it does have disadvantages.
  • One is that the ring is not always centered correctly, which can make disc vibration worse.
  • Another disadvantage is that, once the ring has been applied, it cannot be removed without damaging the disc.
  • Another, important disadvantage is that discs equipped with adhesively attached rings as just described do not fit in all disc players, which limits their usefulness.
  • a U-shaped cross-section provides: (1) upper and lower lips which blanket the upper and lower, outer peripheral surfaces of the disc when the ring is installed, and (2) an integral. lip-connecting rim which surrounds and engages the periphery of the disc to hold it to the disc.
  • the ring is installed by manipulating the outer peripheral edge of the disc to be stabilized and protected by the ring into the space between the upper and lower lips or flanges of the ring, a small clearance in this respect being provided by appropriate dimensioning of the rim so that the lips will readily slip over the edge of the disc. Installation of the ring in the manner just described is easily accomplished because its elastic properties allow the ring to easily be stretched and otherwise distorted to fit it over the edge of the disc.
  • the ring relaxes toward its uninstalled configuration and diameter, securely locking it in place against the outer periphery of the disc with its upper and lower lips extending inwardly from the periphery of the disc in overlying relationship to its upper and lower disc surfaces. Removal of the ring is equally simple. This is effected merely by pulling it off the disc on which it is installed.
  • the lower lip of the installed ring protrudes below the disc, it reduces the area of contact between the disc-and the platter on which it is supported from a circle equalling the disc in diameter to a thin annulus, thereby promoting more perfect surface-to-surface contact between the disc and platter, stabilizing the disc and reducing its tendency to flutter as it is spun. Vibration is further reduced because the resilient material from which the ring is fabricated allows that ring to deform into essentially complete surface-to-surface contact with both the disc supporting platter and the lower surface of disc, thereby further stabilizing the disc and reducing the tendency of the disc to vibrate.
  • the ring will absorb to a significant extent vibrations of the supporting platter which might be transmitted to or set up sympathetic vibrations in the disc as well as other vibrations set up in the disc and attributable to such factors as imbalances in the centering spindle of the disc player. Additionally, because of the extra mass provided at the periphery of the disc by the ring, a further stabilizing factor in the form of increased centrifugal force is provided.
  • the lips of the ring also provide additional surfaces by which the disc may be handled, making it possible to do so without touching the information-bearing surface 'of the disc and damaging that surface of the disc by scratching or by depositing skin oils on it (the cleaning of a disc to remove skin oils — or other foreign matter so that the laser pickup can "see" the information related pits — is a practice which disc manufacturers strongly recommend be held to a minimum) .
  • the material from which the ring is fabricated will normally be one which will absorb such oils, further insuring that they do not get onto the information bearing surface of the disc by migration from the ring.
  • Still another advantage of the present invention is that the centering device required in the above-discussed prior art technique for attaching a stabilizer ring to an audio disc is eliminated. Also, because the ring is in effect self-centering, the centering inaccuracies that arise, even when such a device is employed, are eliminated.
  • the mass added by the ring is a decided benefit as the increased centrifugal force thus ' generated as the disc is spun to read information therefrom reduces the tendency of the disc to tilt and/or flutter.
  • the ring does not interfere with the loading of any tray, magazine, or carousel of which I am aware; and most disc cleaners are compatible with discs on which a ring embodying the principles of the present invention is installed.
  • FIG. 1 is an exploded view of an optical disc stabilized and protected in accord with the principles of the present invention
  • FIG. 2 is an unexploded view of the disc; and FIG. 3 is a section taken substantially along line 3-3 of FIG. 1 to show the cross-sectional configuration of an elastically extensible ring also constructed in accord with the principles of the present invention and employed to stabilize and protect the disc.
  • FIGS. 1 and 2 depict in exploded and unexploded form, respectively, an optical disk 20 protected, stabilized, and damped in accord with the principles of the present invention by a readily removable ring 22 also embodying those principles.
  • the illustrated disc 20 is one designed for the storage of audio information and, more specifically, is what is known in the trade as a five inch compact disc or CD. This disc is, however, merely exemplary of those to which the principles of the present invention are applicable; and that ensuing description of the invention related to disc 20 is therefore intended to be only illustrative and not limiting.
  • Disc 20 has: (1) a bottom or lower surface (not shown) on which information such as the name of the disc, the company issuing the disc, and the (typically) titles of the songs recorded on it will be printed, and (2) an upper surface 24 on which data convertible to an audio signal is digitally recorded as pits along concentric, circular tracks.
  • a circular opening " 25 in the center of disc 24 accommodates a disc player spindle (not shown) which centers disc 24 while it is being spun to read information from it.
  • this information bearing surface or side 24 of disc 20 may prevent the laser pickup employed to read the encoded data from extracting part or all of the data from the affected area or areas. Also described were the adverse effect that tilting, flutter, and other forms of movement and vibrations set up in the disc as it is spun to. read information therefrom can have on the ability of the laser pickup to read information from the disc.
  • the information bearing side 24 of disc 20 is protected against damage and the deposit of foreign materials such as skin oils, stabilized, and damped by assembling ring 22 to the disc as shown in FIG. 2.
  • damping, stabilizing, and protecting ring 22 has: (1) parallel, spaced apart, upper and lower, annular lips 26 and 28; and (2) an integral, circular rim 30 which extends from upper lip 26 to lower lip 28 and cooperates with those lips to define a space or recess 32 extending around the circumference of and opening onto the inner periphery 34 of the ring.
  • Ring 22 completely surrounds the outer edge 34 of disc 20 with the upper lip 26 of the ring blanketing the outer, peripheral portion of the disc's upper side 24 and the lower lip of .the. ring similarly extending over the peripheral portion of the disc's bottom or lower side. It is preferred that these lips be on the order of one-eighth inch wide (dimension "d" in FIG. 3) and that they be on the order of 0.01 plus 0.005 minus 0.002 inch thick. width of the magnitude just identified enables one to easily handle the disc without transferring skin oils from his or her fingers to the disc and thereby making at least a part of that disc fully or partially unreadable. At the same time, widths of that lip will not cover any of the information tracks on disc surface 24.
  • Lip thicknesses in the desired range keep the disc far enough above a supporting surface that, if disc 20 with the ring 22 assembled to it is accidentally dropped or placed with side 24 down on, and then moved relative to the surface, the disc will not be scratched, scraped or similarly damaged.
  • the overall height of the ring (dimension "h" in FIG. 3) limited to the preferred ca. 0.09 inch in those incarnations in which the ring is designed for use with a compact disc, that ring will not interfere with the operation of any known compact disc player including those equipped with carousel- and magazine-type disc changers.
  • One material from which ring 22 can be made contains polychloroprene and butyl polymers and is loaded with zinc oxide and stearic acid.
  • This material identified by the tradename Navcom, is available from Sims Vibration Dynamics, Inc., 2797152nd Avenue N.E., Redmond, Washington 98052. It has a very low modulus of elasticity and is, consequentially, particularly capable of damping or absorbing vibrations, including those in the range of 10-30,000 Hz. Therefore, in addition to keeping vibrations from interfering with the reading of data, this material to at least a very large extent keeps those vibrations in the audible frequency range from being outputted from the disc player as a hum or other noise.
  • Polyurethanes with properties akin to those of Navcom are also available; and the disc protecting and stabilizing ring can be made from compositions of that character, if desired.
  • the preferred Navcom can be formulated so that it will tend to absorb oils. For the present invention, this is a decided benefit. Such absorption keeps skin oils transferred to the ring as disc 20 is handled from migrating from that ring onto the information bearing side 24 of the disc and damaging areas in which information is recorded.
  • the recess 32 between upper and lower lips 26 and 28 is preferably on the order of 0.07 inch. This is slightly greater than the thickness of a CD and. facilitates the assembly of ring 22 to disc 20 in the manner just described.
  • Ring 22 is dimensioned with its outer circumference 36 approximately equal to the outer diameter 34 of disc 20. Consequently, once ring 22 is installed and released, thereby resulting in its relaxing toward its original configuration and dimensions, the circular rim 30 of the ring will elastically engage the outer periphery 34 of disc 20. This securely holds the ring in place on the ring and makes the use of adhe ⁇ ives and other bonding agents unnecessary. This has the advantage, among others, that ring_22 can be removed easily, and without damaging disc 20, simply by pulling it off the outer edge of the disc.
  • ring 22 will have a mass in the range of 2-5 grams with this mass uniformly distributed above and below the centerplane 38 of the ring by virture of its symmetrical construction.
  • This added mass is advantageous in that, because of it, an increased centrifical force is generated as disc 20 is spun to read information therefrom. This increased force tends to keep disc 20 from tilting or fluttering, both of which interfere with the reading of data as the disc is spun.
  • the symmetrical distribution of the ring's mass on both sides of disc 20 also contributes to the stabilization of the disc.
  • the ring is also stabilized by the reduction of the contact area between it and the platter on which it is supported while information is read to a thin annulus and by the ability of the material from which the ring.is formed to deform as necessary into essentially complete contact with the information bearing side 24 of the disc and with the platter on which it is supported.

Landscapes

  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

L'invention se rapporte à des disques optiques (20), qui sont protégés contre les rayures et les éraflures et contre le dépôt de substances étrangères, telles que des traces de doigt graisseuses, et qui ont également des propriétés de stabilisation et d'amortissement des vibrations, de façon à ce que les informations contenues sur le disque ne se perdent pas lors de la lecture du disque par un pickup à laser. On utilise à cet effet un anneau élastiquement déformable et facilement amovible (22) qui comporte des lèvres (26, 28) couvrant les bords extérieurs de la surface de l'anneau, ainsi qu'une bordure en tranche (30) qui se place en prise élastique avec la périphérie externe (34) du disque (20). Cet anneau (22) est de préférence fabriqué à partir d'un matériau qui, en plus d'être extensible, présente des propriétés d'amortissement des vibrations et a le pouvoir d'absorber les traces de doigt graisseuses déposées par la personne qui manipule le disque (20).
PCT/US1991/000108 1990-01-05 1991-01-04 Anneaux protecteurs de stabilisation et d'amortissement des vibrations pour disques optiques WO1991010233A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US46136390A 1990-01-05 1990-01-05
US461,363 1990-01-05

Publications (1)

Publication Number Publication Date
WO1991010233A1 true WO1991010233A1 (fr) 1991-07-11

Family

ID=23832269

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1991/000108 WO1991010233A1 (fr) 1990-01-05 1991-01-04 Anneaux protecteurs de stabilisation et d'amortissement des vibrations pour disques optiques

Country Status (1)

Country Link
WO (1) WO1991010233A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0548968A2 (fr) * 1991-12-27 1993-06-30 Eastman Kodak Company Elément optique d' enregistrement avec couche d'amélioration de durabilité
EP0599655A1 (fr) * 1992-11-27 1994-06-01 Halcil Robert Lotter Couverture protectrice pour disque compact
DE4307382A1 (de) * 1993-03-09 1994-09-15 Leybold Ag Maske zum Abdecken des radial äußeren Bereichs einer scheibenförmigen Substratoberfläche
GB2299699A (en) * 1995-04-03 1996-10-09 Ivan Yung Chih Lin Damping vibrations of a compact disc during playing thereof
GB2330683A (en) * 1995-01-10 1999-04-28 Trevor Alan Burroughs Optical data storage device enclosure with imbalance correction means
US6111560A (en) * 1995-04-18 2000-08-29 Cambridge Display Technology Limited Display with a light modulator and a light source
DE10052747A1 (de) * 2000-10-25 2002-05-16 Iq Data Gmbh Plattenförmiger optischer Datenträger
GB2389698A (en) * 2002-06-11 2003-12-17 Richard Auty Compact disk with scratch protection

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB180078A (en) * 1921-02-24 1922-05-24 Percy Harold Artingstall Improvements in protective devices suitable for use with gramophone records
GB335768A (en) * 1929-10-24 1930-10-02 Jacoviac Maurice Improvements in protecting devices for gramophone disc records
GB816287A (en) * 1958-02-28 1959-07-08 David Allan Blundell Anti-slip and protection means for gramophone record discs
GB829530A (en) * 1958-07-03 1960-03-02 David Allan Blundell Anti-slip and protection means for gramophone record discs
EP0284750A2 (fr) * 1987-02-13 1988-10-05 Sims Vibration Dynamics, Inc. Anneau stabilisateur pour disque optique
US4881218A (en) * 1987-03-14 1989-11-14 Sony Corporation Apparatus for adapting the diameter of a disk-like recording medium

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB180078A (en) * 1921-02-24 1922-05-24 Percy Harold Artingstall Improvements in protective devices suitable for use with gramophone records
GB335768A (en) * 1929-10-24 1930-10-02 Jacoviac Maurice Improvements in protecting devices for gramophone disc records
GB816287A (en) * 1958-02-28 1959-07-08 David Allan Blundell Anti-slip and protection means for gramophone record discs
GB829530A (en) * 1958-07-03 1960-03-02 David Allan Blundell Anti-slip and protection means for gramophone record discs
EP0284750A2 (fr) * 1987-02-13 1988-10-05 Sims Vibration Dynamics, Inc. Anneau stabilisateur pour disque optique
US4881218A (en) * 1987-03-14 1989-11-14 Sony Corporation Apparatus for adapting the diameter of a disk-like recording medium

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0548968A2 (fr) * 1991-12-27 1993-06-30 Eastman Kodak Company Elément optique d' enregistrement avec couche d'amélioration de durabilité
EP0548968A3 (fr) * 1991-12-27 1993-08-04 Eastman Kodak Company Elément optique d' enregistrement avec couche d'amélioration de durabilité
USRE35947E (en) * 1991-12-27 1998-11-03 Eastman Kodak Company Optical element having durability enhancing layer
EP0599655A1 (fr) * 1992-11-27 1994-06-01 Halcil Robert Lotter Couverture protectrice pour disque compact
DE4307382A1 (de) * 1993-03-09 1994-09-15 Leybold Ag Maske zum Abdecken des radial äußeren Bereichs einer scheibenförmigen Substratoberfläche
US5480530A (en) * 1993-03-09 1996-01-02 Leybold Aktiengesellschaft Mask for covering the margin of a disk-shaped substrate
GB2330683A (en) * 1995-01-10 1999-04-28 Trevor Alan Burroughs Optical data storage device enclosure with imbalance correction means
GB2330683B (en) * 1995-01-10 1999-06-23 Trevor Alan Burroughs Semi-permanent enclosure for optical data storage device
GB2299699A (en) * 1995-04-03 1996-10-09 Ivan Yung Chih Lin Damping vibrations of a compact disc during playing thereof
US6111560A (en) * 1995-04-18 2000-08-29 Cambridge Display Technology Limited Display with a light modulator and a light source
DE10052747A1 (de) * 2000-10-25 2002-05-16 Iq Data Gmbh Plattenförmiger optischer Datenträger
GB2389698A (en) * 2002-06-11 2003-12-17 Richard Auty Compact disk with scratch protection

Similar Documents

Publication Publication Date Title
US4736840A (en) Protective holder for a compact disc or the like
US4387807A (en) Ring cover protector for records
EP0170957B1 (fr) Tableau d'aménagement de disques et tourne-disques utilisant ce tableau
US4899330A (en) Adaptor for mini CD
WO1991010233A1 (fr) Anneaux protecteurs de stabilisation et d'amortissement des vibrations pour disques optiques
DK0742559T3 (da) Kasette til optagelse af i det mindste én disk med derpå lagrede informationer, eller hvorpå der lagres informationer med h
GB2333638A (en) A disk drive with a vibration absorber
JP3038983B2 (ja) 光ディスク及びディスクカートリッジ
US5848687A (en) CD protector ring
KR950020463A (ko) 광자기 디스크 플레이어의 자기헤드 승강장치
US20030076768A1 (en) High-density optical disc
US4796139A (en) Disc cassette
JP4240840B2 (ja) ディスクドライブ装置
JPS6132279A (ja) ディスクの収納トレイ
JPS60160059A (ja) 光デイスク装置
JP2819492B2 (ja) クリーニングディスク
JPS6055572A (ja) ディスク収納ケ−ス
JPH0544926Y2 (fr)
KR200193753Y1 (ko) 광디스크
NL1004203C2 (nl) Dempingselement.
JPS6132280A (ja) ディスクの収納トレイ及びそれを用いたプレ−ヤ
KR100312326B1 (ko) 디스크카트리지
KR100298553B1 (ko) 디스크구동장치
KR100585059B1 (ko) 광학기록매체의 회전수 제어방법
US20060048168A1 (en) Tray and disc driving apparatus having the same

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CA HU JP SU

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IT LU NL SE

NENP Non-entry into the national phase

Ref country code: CA