US20030090974A1 - Recording and reproducing device for optical disc - Google Patents

Recording and reproducing device for optical disc Download PDF

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Publication number
US20030090974A1
US20030090974A1 US10/284,480 US28448002A US2003090974A1 US 20030090974 A1 US20030090974 A1 US 20030090974A1 US 28448002 A US28448002 A US 28448002A US 2003090974 A1 US2003090974 A1 US 2003090974A1
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US
United States
Prior art keywords
spindle motor
optical disc
recording
mechanical chassis
reproducing device
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.)
Abandoned
Application number
US10/284,480
Other languages
English (en)
Inventor
Kenichi Miyamori
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.)
Panasonic Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Assigned to MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. reassignment MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MIYAMORI, KENICHI
Publication of US20030090974A1 publication Critical patent/US20030090974A1/en
Priority to US11/907,499 priority Critical patent/US7587813B2/en
Assigned to PANASONIC CORPORATION reassignment PANASONIC CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
Abandoned legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/5313—Means to assemble electrical device
    • Y10T29/53143—Motor or generator
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/5313—Means to assemble electrical device
    • Y10T29/5317—Laminated device
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53978—Means to assemble or disassemble including means to relatively position plural work parts

Definitions

  • the present invention relates to a recording and reproducing device for an optical disc and particularly concerns a recording and reproducing device for an optical disc such as a CD (Compact Disc), MD (Mini Disc), and DVD (Digital Video Disc or Digital Versatile Disc).
  • a CD Compact Disc
  • MD Mini Disc
  • DVD Digital Video Disc or Digital Versatile Disc
  • the rotation axis of a spindle motor in a recording and reproducing device for an optical disc and the optical axis of the optical pickup need to be placed in parallel with each other.
  • the rotation axis of the spindle motor and the optical axis of the optical pickup may not be in parallel with each other.
  • a turntable surface of the spindle motor and a direction of transfer of the optical pickup may not be in parallel with each other.
  • a mechanical chassis includes a mechanism for inclining a spindle motor to a mechanical chassis so as to adjust a parallelism between the rotation axis of a spindle motor and the optical axis of an optical pickup and a parallelism between a turntable surface of the spindle motor and a direction of transfer of the optical pickup.
  • This mechanism adjusts a tilt angle of the spindle motor after completion of assembling.
  • a second publicly known technique for adjusting a tilt angle of the spindle motor is disclosed in JP-A-8-17135 and JP-A-9-223353.
  • the base plate mounted with a spindle motor is attached to the mechanical chassis in a state being supported at three points.
  • a spacer is sandwiched between the mechanical chassis and the base plate so that the one of the three points works as a fulcrum to the mechanical chassis.
  • the base plate is connected to the mechanical chassis by means of a screw with a spring being sandwiched between the base plate and the mechanical chassis. Therefore, the angle of inclination of the base plate is adjusted according to a screwing amount of the screw.
  • a publicly known technique for adjusting a parallelism by inclining guide shafts has been available as follows: a pair of guide shafts is provided, and the guide shafts are supported on a supporting point near the inner circumferential side of a disc and are movably placed in a vertical direction near the outer circumferential side. On this freely movable part, springs are provided between the guide shafts and the chassis, and the tip of an adjust screw is brought into contact with the guide shafts in such a manner as to resist the force of the springs.
  • the present invention has as its objective the provision of a thinner device at low cost by devising a structure for attaching a spindle motor to a mechanical chassis in a recording and reproducing device for an optical disc.
  • a recording and reproducing device for an optical disc of the present invention comprises a spindle motor for rotating an optical disc, a mechanical chassis for fixing the spindle motor, a fixing member provided on the spindle motor, and bonding means for fixing the spindle motor to the mechanical chassis by bonding the fixing member to the mechanical chassis in a state in which attitude adjustment and positioning are performed.
  • a device for assembling the recording and reproducing device for an optical disc is provided on the outside of the recording and reproducing device and comprises means for adjusting inclination of the spindle motor in the track width direction, means for adjusting inclination of the spindle motor in the track tangent direction, and means for adjusting a height of the spindle motor relative to the optical pickup.
  • the assembling device prefferably has means for adjusting the position of the spindle motor in the surface direction of an optical disc.
  • FIG. 1 is a perspective view showing an embodiment of a recording and reproducing device for an optical disc of the present invention
  • FIG. 2 is an exploded perspective view showing the recording and reproducing device of FIG. 1;
  • FIG. 3 is a plane view showing the recording and reproducing device shown in FIGS. 1 and 2;
  • FIG. 4 is a sectional view showing a structure of how to attach a spindle motor in the recording and reproducing device in FIGS. 1 to 3 ;
  • FIG. 5 is a plan view showing a part of FIG. 4;
  • FIG. 6 is a view showing a main configuration of an assembling device according to the present invention.
  • FIG. 7 is a view showing that assembling of the spindle motor is completed by using the assembling device of FIG. 6;
  • FIG. 8 is a view showing a main configuration of an assembling device according to another example of the present invention.
  • FIG. 9 is a view showing a variation of the assembling device shown in FIG. 8;
  • FIG. 10 is a view for explaining a function of guards according to the present invention.
  • FIG. 11 is a view for explaining inconvenience when the guards are absent
  • FIG. 12 is a view showing an example in which no inconvenience occurs even when the guards of FIG. 10 are absent.
  • FIG. 13 is a view showing that assembling of the spindle motor of FIG. 12 is completed.
  • a mechanical chassis 101 comprises two guide shafts 104 serving as guides for moving an optical pickup 102 in the radius direction, that is, a track width direction of an optical disc 103 , and a traverse motor 105 serving as a driving source for moving the optical pickup 102 in the track width direction of the optical disc 103 .
  • the traverse motor 105 rotates, the optical pickup 102 is transferred in the track width direction according to the guide shafts 104 while maintaining a prescribed distance from a disc surface of the optical disc 103 .
  • An objective lens 112 is provided on the optical pickup 102 .
  • Reference numeral 112 a denotes a lens frame of the objective lens 112 and is formed as a flat surface with accuracy.
  • a turntable 107 for placing the optical disc 103 thereon is provided on a spindle motor 106 for rotating the optical disc 103 at a prescribed rotational frequency.
  • a plurality of protrusions 108 are provided along the circumferential direction.
  • the protrusions 108 protrude in the diameter direction from the motor base 106 a to attach the spindle motor 106 to the mechanical chassis 101 .
  • a round notch 109 b for storing the spindle motor 106 is formed on the mechanical chassis 101 , and a plurality of recessed steps 109 is provided on the circumferential wall of the mechanical chassis 101 where the notch 109 b is formed.
  • the recessed steps 109 permit the protrusions 108 to be freely fit when the spindle motor 106 is stored in the notch 109 b.
  • the spindle motor 106 is positioned relative to the mechanical chassis 101 while being held by an external adjusting device 100 . After adjustment of a tilt angle and a parallelism relative to the optical pickup, the spindle motor 106 is fixed on the mechanical chassis 101 .
  • the spindle motor 106 is placed on the upper ends of a plurality of height determining pins 111 provided on the external adjusting device 100 , so that the spindle motor 106 is supported by the height determining pins 111 while being positioned in the height direction, that is, the thickness direction of the device.
  • the external adjusting device 100 has a plurality of open/close chucking pins 110 in the circumferential direction.
  • the craws on the tips of the chucking pins 110 can chuck the base 106 a of the spindle motor 106 .
  • the protrusions 108 are formed by bending, so that the protrusions 108 have guards 106 d which are integrally formed in parallel with the shaft center of the spindle motor 106 .
  • the guards 106 d are provided outside the chucking pins 110 in the diameter direction of the spindle motor 106 when the chucking pins 110 chuck the base 106 a of the spindle motor 106 .
  • the spindle motor 106 is positioned in the notch 109 b of the mechanical chassis 101 while being held by the external adjusting device 100 . At this moment, the leading ends of the protrusions 108 from the guards 106 d are freely fit into the recessed steps 109 . In this state, a tilt angle of the spindle motor 106 and the parallelism relative to the optical pickup are adjusted by adjusting the attitude and position of the external adjusting device 100 as required. Then, adhesive 109 a made of an ultraviolet curing resin is filled in the recessed steps 109 . Thereafter, the adhesive 109 a is cured by radiating ultraviolet rays and thus the protrusions 108 are fixed to the recessed steps 109 . In this way, the spindle motor 106 is attached to the mechanical chassis 101 with a required attitude. The external adjusting device 100 is removed at proper time.
  • the spindle motor 106 is held by the external adjusting device 100 provided outside a recording and reproducing device, a tilt angle of the spindle motor 106 is adjusted in this holding state, a parallelism between the spindle motor 106 and the optical pickup 102 is adjusted, and then, the spindle motor 106 is attached to the mechanical chassis 101 .
  • the recording and reproducing device does not need a mechanism for adjusting the inclination and height of the spindle motor 106 . For this reason, it is possible to provide an inexpensive configuration of the recording and reproducing device for an optical disc and to reduce a thickness of the recording and reproducing device for an optical disc.
  • the resin adhesive is used for attaching the spindle motor 106 to the mechanical chassis 101 , so that it is possible to reduce vibration caused by the rotation of the spindle motor 106 .
  • low noise can be achieved.
  • noise components of a signal obtained from the optical pickup 102 can be reduced.
  • current for focusing can be reduced accordingly, achieving lower power consumption.
  • the external adjusting device 100 for holding the spindle motor 106 is attached to an inclination adjusting mechanism 113 .
  • the inclination adjusting mechanism 113 can incline the external adjusting device 100 at an angle ⁇ R in the track width direction and an angle ⁇ T in the track tangent direction of the optical disc 103 while using as a center a point where an ideal center line position of the optical disc 103 intersects an ideal focal position (height surface) of the objective lens 112 mounted on the optical pickup 102 .
  • Reference numeral 113 a denotes a columnar guide surface for inclining the external adjusting device 100 by an angle ⁇ R in the track width direction of the optical disc 103 with the above intersection serving as the center.
  • the columnar guide surface 113 a is formed into a column around a center axis passing through the intersection, that is, a center axis perpendicular to the surface shown in FIG. 6.
  • reference numeral 113 b denotes a columnar guide surface for inclining the external adjusting device 100 by an angle ⁇ T in the track tangent direction of the optical disc 103 with the above intersection serving as the center.
  • the columnar guide surface 113 b is formed into a column around a center axis passing though the intersection, that is, a center axis in parallel with the surface shown in FIG. 6. As shown in FIG. 6, the guide surfaces 113 a and 113 b are placed as double layers so as to overlap each other at a distance in the thickness direction of the device.
  • a height adjusting mechanism 114 is provided which can move the mechanical chassis 101 in the Z direction relative to the spindle motor 106 held by the external adjusting device 100 .
  • the spindle motor 106 is attached to the mechanical chassis 101 , as shown in FIG. 6, in a state in which the spindle motor 106 is held by the external adjusting device 100 , the inclination and height of the two guide shafts 104 attached to the mechanical chassis 101 are measured by an external measuring machine such as a three-dimensional measuring machine (not shown) in the track width direction and the track tangent direction as shown in FIGS. 1 to 3 .
  • an external measuring machine such as a three-dimensional measuring machine (not shown) in the track width direction and the track tangent direction as shown in FIGS. 1 to 3 .
  • a three-dimensional measuring machine not shown
  • it is possible to measure displacement in inclination and height of the optical pickup 102 which records and reproduces a signal for a disc, in the track width direction and the track tangent direction relative to an ideally positioned disc.
  • the inclination and height of the disc placing surface 107 a in the track width direction and the track tangent direction can be adjusted in accordance with the inclination and height of the optical pickup 102 in the track width direction and the track tangent direction.
  • adjustment is made in such a way that agreement is made between the optical axis of the objective lens 112 and the rotation axis of the spindle motor 106 and the focus of the objective lens 112 matches with the recording surface of the optical disc 103 .
  • the spindle motor 106 adjusted thus is fixed to the mechanical chassis 101 by adhesive, wax represented by solder, and bonding means 109 a such as welding.
  • the present invention eliminates the need to provide a mechanism for adjusting the inclination or height of the spindle motor 106 .
  • a center position adjusting mechanism 115 for making movement in the XY direction is provided for one of the inclination adjusting mechanism 113 , which adjusts inclination of the disc placing surface 107 a in the track width direction and the track tangent direction on the turntable 107 of the spindle motor 106 , and the height adjusting mechanism 114 of the mechanical chassis 101 .
  • FIG. 8 shows an example in which the center position adjusting mechanism 115 is provided for the inclination adjusting mechanism 113
  • FIG. 9 shows an example in which the center position adjusting mechanism 115 is provided for the height adjusting mechanism 114 .
  • the inclination and height in the track width direction and the track tangent direction are measured by the external measuring machine such as a three-dimensional measuring machine.
  • the external measuring machine such as a three-dimensional measuring machine.
  • it is possible to measure displacement in inclination and height of the optical pickup 102 which records and reproduces a signal for the optical disc 103 , in the track width direction and the track tangent direction relative to an ideal disc.
  • the spindle motor 106 adjusted thus is fixed to the mechanical chassis 101 by adhesive, wax, and the bonding means 109 a such as welding.
  • the present invention makes it possible to precisely make agreement between the absolute attaching center of the spindle motor in the mechanical chassis 101 and the rotation center of the spindle motor 106 .
  • it is to reduce the width of a magnetic head in the track tangent direction, achieving lower power consumption.
  • the guards 106 d formed integrally with the protrusions 108 of the spindle motor 106 . As shown in FIG. 10, the guards 106 d are formed in parallel with the shaft center of the motor 106 by bending the protrusions 108 as described above.
  • the guards 106 d are placed at a distance in the diameter direction of the motor 106 from a rotor outer circumference 106 c of the spindle motor 106 , so that as described above, the guards 106 d are positioned outside the chucking pins 110 along the diameter direction of the spindle motor 106 when the chucking pins 110 chuck the base 106 a of the spindle motor 106 .
  • FIGS. 11 to 13 show that the protrusions 108 simply protrude from the motor base 106 a of the spindle motor 106 in the diameter direction and the guards 106 d are not provided.
  • the chucking pins 110 may hit the mechanical chassis 101 as shown in FIG. 11.
  • FIG. 12 shows a state in which the protrusions 108 , of the spindle motor 106 are freely fit into the recessed steps 109 of the mechanical chassis 101 without allowing the chucking pins 110 to hit the mechanical chassis 101 .
  • FIG. 13 shows a state in which various measurements are performed by the external measuring machine thereafter, the attitude and position of the spindle motor 106 are adjusted accordingly, and the spindle motor 106 is fixed to the mechanical chassis 101 by the bonding means 109 a.

Landscapes

  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
  • Rotational Drive Of Disk (AREA)
US10/284,480 2001-11-01 2002-10-31 Recording and reproducing device for optical disc Abandoned US20030090974A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/907,499 US7587813B2 (en) 2001-11-01 2007-10-12 Assembly device for optical disk

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001336322A JP2003141811A (ja) 2001-11-01 2001-11-01 光ディスク記録再生装置
JP2001-336322 2001-11-01

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US11/907,499 Division US7587813B2 (en) 2001-11-01 2007-10-12 Assembly device for optical disk

Publications (1)

Publication Number Publication Date
US20030090974A1 true US20030090974A1 (en) 2003-05-15

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Application Number Title Priority Date Filing Date
US10/284,480 Abandoned US20030090974A1 (en) 2001-11-01 2002-10-31 Recording and reproducing device for optical disc
US11/907,499 Expired - Fee Related US7587813B2 (en) 2001-11-01 2007-10-12 Assembly device for optical disk

Family Applications After (1)

Application Number Title Priority Date Filing Date
US11/907,499 Expired - Fee Related US7587813B2 (en) 2001-11-01 2007-10-12 Assembly device for optical disk

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US (2) US20030090974A1 (ja)
JP (1) JP2003141811A (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140013341A1 (en) * 2010-03-04 2014-01-09 Lg Innotek Co., Ltd. Integrated disk driving module including a lateral surface plate bent from an upper plate

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CN101019185A (zh) * 2004-09-13 2007-08-15 皇家飞利浦电子股份有限公司 带有可调整的旋转盘位置的光盘系统
JP4023746B2 (ja) * 2005-02-23 2007-12-19 日本発条株式会社 ハード・ディスク・ドライブ用のベース及び製造方法
US7969674B2 (en) * 2008-10-03 2011-06-28 Seagate Technology Llc Data transfer assembly performance characteristics testing

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US5796707A (en) * 1996-04-23 1998-08-18 Samsung Electronics Co., Ltd. Optical recording and reproducing apparatus having means for correcting installation angle of spindle motor
US5867471A (en) * 1996-04-23 1999-02-02 Samsung Electronics Co., Ltd. Optical recording and reproducing apparatus having device for correcting position of spindle motor
US6005836A (en) * 1996-06-25 1999-12-21 Samsung Electronics Co., Ltd. Optical pickup tilt adjustable disk player including tilt adjustable unit for controlling the tilt of a motor plate
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US6236636B1 (en) * 1997-11-28 2001-05-22 Yamaha Corporation Spindle motor inclination angle adjusting mechanism in optical disk apparatus
US6324152B1 (en) * 1996-09-06 2001-11-27 Kabushiki Kaisha Toshiba Disc reproducing apparatus with motor base bearing system
US6792614B1 (en) * 1999-09-29 2004-09-14 Matsushita Electric Industrial Co., Ltd. Optical disk apparatus and method of installing its spindle motor

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US5796707A (en) * 1996-04-23 1998-08-18 Samsung Electronics Co., Ltd. Optical recording and reproducing apparatus having means for correcting installation angle of spindle motor
US5867471A (en) * 1996-04-23 1999-02-02 Samsung Electronics Co., Ltd. Optical recording and reproducing apparatus having device for correcting position of spindle motor
US6005836A (en) * 1996-06-25 1999-12-21 Samsung Electronics Co., Ltd. Optical pickup tilt adjustable disk player including tilt adjustable unit for controlling the tilt of a motor plate
US6324152B1 (en) * 1996-09-06 2001-11-27 Kabushiki Kaisha Toshiba Disc reproducing apparatus with motor base bearing system
US6181669B1 (en) * 1997-06-13 2001-01-30 Samsung Electronics Co., Ltd. Apparatus for adjusting a tilt of a disc loaded on a turn table
US6236636B1 (en) * 1997-11-28 2001-05-22 Yamaha Corporation Spindle motor inclination angle adjusting mechanism in optical disk apparatus
US6792614B1 (en) * 1999-09-29 2004-09-14 Matsushita Electric Industrial Co., Ltd. Optical disk apparatus and method of installing its spindle motor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140013341A1 (en) * 2010-03-04 2014-01-09 Lg Innotek Co., Ltd. Integrated disk driving module including a lateral surface plate bent from an upper plate

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Publication number Publication date
JP2003141811A (ja) 2003-05-16
US7587813B2 (en) 2009-09-15
US20080046901A1 (en) 2008-02-21

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AS Assignment

Owner name: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MIYAMORI, KENICHI;REEL/FRAME:013706/0354

Effective date: 20030123

STCB Information on status: application discontinuation

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Free format text: CHANGE OF NAME;ASSIGNOR:MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.;REEL/FRAME:021930/0876

Effective date: 20081001