EP0708965A1 - Dispositif de fixation d'un disque porteur de donnees sur un plateau d'entrainement - Google Patents

Dispositif de fixation d'un disque porteur de donnees sur un plateau d'entrainement

Info

Publication number
EP0708965A1
EP0708965A1 EP95909073A EP95909073A EP0708965A1 EP 0708965 A1 EP0708965 A1 EP 0708965A1 EP 95909073 A EP95909073 A EP 95909073A EP 95909073 A EP95909073 A EP 95909073A EP 0708965 A1 EP0708965 A1 EP 0708965A1
Authority
EP
European Patent Office
Prior art keywords
carrier
disc
pressure member
disc pressure
mmtable
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Withdrawn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
EP95909073A
Other languages
German (de)
English (en)
Inventor
Theodoor François Henriette THIJS
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
Philips Electronics NV
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 Koninklijke Philips Electronics NV, Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to EP95909073A priority Critical patent/EP0708965A1/fr
Publication of EP0708965A1 publication Critical patent/EP0708965A1/fr
Withdrawn legal-status Critical Current

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
    • G11B17/022—Positioning or locking of single discs
    • G11B17/028—Positioning or locking of single discs of discs rotating during transducing operation
    • G11B17/032—Positioning by moving the door or the cover

Definitions

  • the invention relates to a device for clamping an information disc onto a turntable, comprising a frame, a turntable for supporting the information disc, which turntable is supported by the frame and is rotatable about an axis of rotation, a carrier which is movable between a first and a second position, which carrier has a disc pressure member for pressing the information disc onto the turntable in the first position of the carrier, the carrier cooperating with the disc pressure member to move said member away from the turntable during a movement of the carrier from the first position to the second position, and the carrier carrying the disc pressure member in the second position.
  • Such a device is known from DE-A 33 03 705 (herewith incorporated by reference).
  • the known device comprises a turntable mounted on a drive spindle and having a supporting surface for an information disc, for example an optical disc, which can be scanned without mechanical contact by means of laser beam.
  • the known device further comprises a carrier provided with magnetic means and a disc-pressure member and constructed in the form of a cover, the cover being hingeably connected to a housing and being movable between a closed position, in which the disc pressure member is capable of pressing an information disc against the supporting surface of the turntable by means of a first magnetic force, and an open position, in which the disc pressure member is retained by a second magnetic force.
  • the magnetic means comprise a ring-shaped permanent magnet secured to the disc pressure member and a ferromagnetic ring secured to the cover.
  • the permanent magnet In the closed position of the cover the permanent magnet cooperates with the turntable, which is made of a ferromagnetic material, to press an information disc onto the turntable.
  • the disc pressure member In order to counteract the influence of the ferromagnetic ring the disc pressure member has been provided with a protective cap.
  • the permanent magnet In the open position the permanent magnet cooperates with the ferromagnetic ring to hold the disc pressure member in a floating condition counteracted by the weight of this member.
  • a drawback of the known device is that during a movement of the cover between its open position and its closed position the disc pressure member performs a comparatively large but particularly jerky displacement and consequently produces noise.
  • Another drawback is the comparatively large overall height and the comparatively large number of parts required for the known construction.
  • the device in accordance with the invention is characterised in that the carrier comprises resilient means which are in a contactless position relative to the disc pressure member in the first position of the carrier and which retain the disc pressure member in the second position of the carrier.
  • the resilient means are constructed and positioned in such a way that in the first position of the carrier, in which position it is possible to record and/or read information, the disc pressure member together with the turntable can rotate entirely clear of the carrier or parts thereof.
  • a simple magnet system for example formed by a permanent magnet in the turntable and a soft-magnetic part in the carrier, can provide the required pressure on an information disc present on the turntable.
  • the device in accordance with the invention comprises comparatively simple means to allow free rotation of the disc pressure member in the first position and to ensure that it remains rattle-free in the second position. These means require only a minimal overall height.
  • the carrier of the device in accordance with the invention may be formed by a cover which is hingeably connected to a housing.
  • the resilient means comprise a resilient tongue having a contact face for cooperation with a circumferential edge of the disc pressure member, which contact face faces the disc pressure member. In the second position of the support the contact face of the resilient tongue ensures that the disc pressure member is locked.
  • An embodiment of the device in accordance with the invention is characterised in that the resilient tongue is disposed adjacent the disc pressure member and, in the first position of the carrier, extends substantially parallel to the axis of rotation of the turntable, the contact face being provided on a projecting portion of the resilient tongue, which projecting portion faces the disc pressure member and is disposed at least partly between the circumferential edge of the disc pressure member and the turntable in the first position of the carrier a; engages tightly against the circumferential edge in the second position of the carrier.
  • the projecting portion is a substantially V-shaped free end portion of the resilient tongue, the portions of the resilient tongue which form the V-shaped end portion diverging viewed from the disc pressure member. For a correct operation it is not necessary for said portions of the tongue to have the same length.
  • An embodiment of the device : ⁇ accordance with the invention is characterised in that in the second position of the carrier the resilient tongue presses the disc pressure member against an abutment forming part of the carrier.
  • this abutment is integral with the carrier and in the first position of the carrier it is preferably situated between the circumferential edge of the disc pressure member and the turntable. The spacing between the circumferential edge and the stop is preferably small.
  • the resilient means comprise a total of three resilient tongues which are equispaced along the circumferential edge of the disc pressure member. In this embodiment the disc pressure member is retained efficiently in the second position of the carrier by three equispaced tongues.
  • An embodiment of the device in accordance with the invention is characterised in that the resilient means together with the carrier are constructed as a single injection-moulded product.
  • the resilient means particularly the tongue or tongues, are realised simply yet effectively in this embodiment.
  • the synthetic material may be, for example, acrylonitrile butadiene styrene (ABS).
  • ABS acrylonitrile butadiene styrene
  • JP-A 3-46153 herewith incorporated by reference.
  • the pressure spring has one end attached directly to a holder and the other end to a disc pressure member via an intermediate element.
  • the holder is movable between a first position situated nearer a turntable and a second position situated remoter from the turntable.
  • the pressure spring exerts pressure on a disc lying on the turntable via the disc pressure member.
  • the disc pressure member is suspended from the pressure spring.
  • a drawback of the known mechanism is that the pressure spring is constantly connected to the disc pressure member, so that during clamping this member cannot rotate freely, i.e. without contact, relative to the holder with the pressure spring.
  • the invention further relates to a scanning device for optically scanning an information disc.
  • a scanning device for optically scanning an information disc Such a device is known from the afore-mentioned DE-A 33 03 705.
  • the known device is a disc player suitable for reading, for example, optical discs and comprises a housing with an optical scanning system.
  • a first version of the scanning device in accordance with the invention for optically scanning an information disc comprises the device in accordance with the invention for clamping an information disc onto a turntable and further comprises a unit including an objective which is movable towards and away from the axis of rotation of the turntable.
  • a second version of the scanning device in accordance with the invention for optically scanning an information disc comprises a housing and a unit including a turntable and an objective which is movable towards and away from the turntable preferably comprises a device in accordance with the invention for clamping an information disc onto a turntable and further comprises a cover, which is hingeably connected to a housing, and a damper, preferably arranged in the housing, the cover having an arm with a curved toothed surface for cooperation with a toothed wheel of the damper, means being provided for generating an increasing normal force between the toothed wheel and the toothed surface during opening of the cover.
  • An embodiment of the last-mentioned device in accordance with the invention for optically scanning an information disc is characterised in that the means comprise a resilient finger which is inclined towards the toothed wheel and on which at least a part of the toothed surface extends, which finger has a receding end portion which adjoins the toothed surface, for cooperation with the toothed wheel in order to lock the cover in an open position.
  • the toothed wheel loads the resilient finger and in the open position of the cover the finger can relax and thereby cause the cover to be locked.
  • the invention also relates to an optical player provided with a scanning device in accordance with the invention.
  • Figure 1 is a partly exploded perspective view showing an embodiment of the scanning device in accordance with the invention, provided with a cover,
  • Figure 2 is a perspective underneath view showing the cover of the embodiment of Fig. 1 as well as a disc pressure member
  • Figure 3 shows the cover, provided with the diagrammatically shown disc pressure member, in an open position in a sectional view taken on the line III-III in Figure 2, and
  • Figure 4 shows the cover, provided with the diagrammatically shown disc pressure member, in a closed position in a sectional view taken on the line III-III in Figure 2.
  • the scanning device in accordance with the invention shown in Figure 1 forms part of an optical player 1 , particularly a CD or CDI player.
  • the scanning device comprises a housing la with a frame 1, in which an electro-optical scanning unit 3 is mounted by resilient and damping fixing means, and a cover which is hingeably connected to the frame 1 by means of two pivots 5.
  • the scanning device 3 which comprises an objective 9, is of a type as disclosed in EP-A 541 162 (PHN 13.884, herewith incorporated by reference).
  • the scanning unit 3, which is thus known er se, for optically recording and/or reading information comprises an electrically drivable turntable 11, which is rotatable about an axis of rotation 11a, for supporting and centring an inscribable and or readable optical information disc, such as a CD or CDI.
  • Mechanical guide means 13 serve for supporting and guiding a slide 15, which can be translated in a radial direction relative to the axis of rotation 11a and on which an actuator carrying the objective 9 is mounted.
  • the slide 15 serves for moving the objective 9 over a comparatively large distance in a radial direction relative to the turntable 11 and the actuator serves for realising comparatively small focusing and tracking movements of the objective 9.
  • the scanning device in accordance with the invention comprises a device for clamping an information disc onto the turntable 11.
  • the clamping device comprises a carrier with a disc pressure member 17, which carrier is movable between a first position and a second position and is formed by the cover 7.
  • the disc pressure member 17 In the first position, which corresponds to the closed position of the cover 7, the disc pressure member 17 cooperates with the mmtable 11 to retain an information disc lying on the mmtable.
  • the disc pressure member 17 is entirely clear of the cover 7 and the required clamping force is provided by a magnet system having a first part 16, for example a permanent magnet, situated in the disc pressure member 17 and a second part 18, for example a soft-magnetic disc, situated in the mmtable 11.
  • Figure 4 shows the cover 7 in the first position.
  • Figure 3 shows the cover 7 in the second or open position, in which position the disc pressure member 17 is supported by the cover.
  • the cover 7, also see Figure 2 has resilient means which in the present example comprise three resilient tongues 19, which are spaced from the disc pressure member 17 in the first position of the cover and which retain the disc pressure member 17 in the second position of the cover 7.
  • the resilient tongues 19 are disposed in an imaginary cylindrical surface surrounding the disc pressure member 17 and are oriented in such a manner that they extend substantially parallel to the axis of rotation 11a of the mmtable 11 in the closed position of the cover.
  • the resilient tongues 19 and the cover 7 form an integral injection-moulded product of, for example, ABS.
  • the resilient tongues 19 each have a projecting, particularly V-shaped, end portion 19a with a contact face 21 which faces the disc pressure member 17.
  • the end portions 19a are spaced from and disposed at least partly between a circumferential edge 17a of the disc pressure member 17 and the turntable 11.
  • the circumferential edge 17a of the disc pressure member 17 is a tight fit between the contact faces 21 of the resilient tongues 19 and one or more abutments of the cover 7.
  • the cover 7 has three abutments 23, each constructed as a fixed projection on a cylindrical wall portion 25 of the cover 7.
  • a damper 31 situated in the housing la is secured to the frame 1 and has a toothed wheel 33 for cooperation with a toothed surface 35 provided on an arm 37 of the cover 7.
  • the at least partly bent or curved toothed surface 35 extends at least partly over a resilient finger 39 of the arm 37.
  • the toothed wheel 33 is in mesh with the toothed surface 35.
  • the toothed surface 35 is shaped and positioned in such a manner that during opening an increasing force is exerted on the finger 39, which force is directed towards the pivot 5. In the present example this is achieved in that the toothed surface 35 is given a more gradual curvature or has no curvature at all at the location of the finger 39.

Landscapes

  • Holding Or Fastening Of Disk On Rotational Shaft (AREA)

Abstract

L'invention se rapporte à un dispositif de fixation d'un disque porteur de données sur un plateau d'entraînement, ce dispositif comprenant un cadre, un plateau d'entraînement pour supporter un disque porteur d'informations, ce plateau étant supporté par le cadre et tournant autour d'un axe de rotation, et un support (7) qui peut se déplacer entre une première et une seconde position, ce support possédant un élément (17) faisant pression sur le disque afin de serrer le disque porteur de données sur le plateau d'entraînement dans la première position du support. Le support comprend des éléments élastiques (19) qui sont surélevés par rapport à l'élément faisant pression sur le disque dans la première position du support et qui retiennent cet élément dans la seconde position du support.
EP95909073A 1994-03-09 1995-03-02 Dispositif de fixation d'un disque porteur de donnees sur un plateau d'entrainement Withdrawn EP0708965A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP95909073A EP0708965A1 (fr) 1994-03-09 1995-03-02 Dispositif de fixation d'un disque porteur de donnees sur un plateau d'entrainement

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP94200592 1994-03-09
EP94200592 1994-03-09
EP95909073A EP0708965A1 (fr) 1994-03-09 1995-03-02 Dispositif de fixation d'un disque porteur de donnees sur un plateau d'entrainement
PCT/IB1995/000130 WO1995024717A1 (fr) 1994-03-09 1995-03-02 Dispositif de fixation d'un disque porteur de donnees sur un plateau d'entrainement

Publications (1)

Publication Number Publication Date
EP0708965A1 true EP0708965A1 (fr) 1996-05-01

Family

ID=8216696

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95909073A Withdrawn EP0708965A1 (fr) 1994-03-09 1995-03-02 Dispositif de fixation d'un disque porteur de donnees sur un plateau d'entrainement

Country Status (3)

Country Link
EP (1) EP0708965A1 (fr)
JP (1) JPH08510586A (fr)
WO (1) WO1995024717A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE892073A (fr) * 1982-02-09 1982-05-27 Staar Sa Dispositif de maintien d'un verrou magnetique pour tourne disque
NL8601938A (nl) * 1986-07-28 1988-02-16 Philips Nv Opspaninrichting voor het op een aandrijfspil opspannen van een optische plaat.
NL8700819A (nl) * 1987-04-08 1988-11-01 Philips Nv Inrichting voor het registreren van informatie op of het uitlezen van informatie uit een informatieplaat.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9524717A1 *

Also Published As

Publication number Publication date
WO1995024717A1 (fr) 1995-09-14
JPH08510586A (ja) 1996-11-05

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