US20020009036A1 - Chucking device for disc drive - Google Patents
Chucking device for disc drive Download PDFInfo
- Publication number
- US20020009036A1 US20020009036A1 US09/196,509 US19650998A US2002009036A1 US 20020009036 A1 US20020009036 A1 US 20020009036A1 US 19650998 A US19650998 A US 19650998A US 2002009036 A1 US2002009036 A1 US 2002009036A1
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- United States
- Prior art keywords
- disc
- chucking
- pulley
- center
- magnet
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Classifications
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- 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
- G11B17/0284—Positioning or locking of single discs of discs rotating during transducing operation by clampers
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- 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
- G11B17/04—Feeding or guiding single record carrier to or from transducer unit
- G11B17/05—Feeding or guiding single record carrier to or from transducer unit specially adapted for discs not contained within cartridges
- G11B17/053—Indirect insertion, i.e. with external loading means
- G11B17/056—Indirect insertion, i.e. with external loading means with sliding loading means
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- 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
- G11B17/0281—Positioning or locking of single discs of discs rotating during transducing operation by an adapter enabling the centre-pin to receive carriers with large centre hole
-
- 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
- G11B17/0284—Positioning or locking of single discs of discs rotating during transducing operation by clampers
- G11B17/0285—Positioning or locking of single discs of discs rotating during transducing operation by clampers mounted on a bridge
-
- 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
- G11B17/0288—Positioning or locking of single discs of discs rotating during transducing operation by means for moving the turntable or the clamper towards the disk
-
- 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
- G11B17/03—Positioning or locking of single discs of discs rotating during transducing operation in containers or trays
-
- 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
- G11B17/04—Feeding or guiding single record carrier to or from transducer unit
- G11B17/041—Feeding or guiding single record carrier to or from transducer unit specially adapted for discs contained within cartridges
- G11B17/044—Indirect insertion, i.e. with external loading means
- G11B17/047—Indirect insertion, i.e. with external loading means with sliding loading means
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
- G11B2220/2537—Optical discs
Definitions
- This invention relates to a disc chucking device of an optical disc drive which loads an optical disc using a disc tray, and chucks the loaded optical disc on a disc table using a chucking pulley.
- FIG. 17 A sort of optical disc drive which the inventors of the present invention have applied is described with reference to FIGS. 11 to 18 .
- an optical disc 1 is placed horizontally in a pit 3 formed on the upper surface of a disc tray 2 , thereafter, when a front panel 2 a of the disc tray 2 is pressed lightly in the direction indicated by an arrow a 1 , a loading switch (not shown in the drawing) is turned on, the disc tray 2 is drawn horizontally from the direction indicated by the arrow a 1 namely the loading direction into the optical disc drive through a tray gate 4 by means of a loading mechanism which will described hereinafter as shown in FIG. 18, and as the result, the optical disc 1 is automatically loaded horizontally on a disc table of a spindle motor.
- the optical disc 1 After loading, the optical disc 1 is rotated at high speed by the spindle motor in response to a recording and/or reproducing command signal supplied from a host computer, data in the optical disc 1 is recorded and/or reproduced by an optical pickup.
- the disc tray 2 After reproduction of the optical disc 1 , the disc tray 2 is unloaded automatically in the direction of the arrow a 2 namely the unloading direction to the outside of the optical disc drive through the tray gate 4 in response to an unloading command signal supplied from the host computer as shown in FIG. 17.
- the disc tray 2 consists of synthetic resin, and a slotted hole bottom aperture 8 is formed along a tray center P 1 extending from the center of the pit 3 to the rear end 2 b side.
- a pair of right and left guide rails 9 is formed combinedly in parallel to the tray center P 1 on the right and left side edges of the disc tray 2 .
- J-shaped parallel rack 10 and guide groove 11 are formed combinedly.
- the linear portions 10 a and 11 a of the rack 10 and the guide groove 11 are formed in parallel to the tray center P 1 , and on the end of the front panel 2 a side, the circular portions 10 b and 11 b are formed.
- a box-shaped chassis formed of synthetic resin is provided in the internal of the optical disc drive 5 , and the pair of right and left guide rails 9 of the disc tray 2 is guided by a plurality of tray guides 15 formed combinedly on the inside of the right and left side plates 14 a of the chassis 14 and slid in the direction of arrows a 1 and a 2 .
- a lift frame 16 formed of synthetic resin is attached on the bottom 14 b of the chassis 14 .
- Insulator fixing members 17 and 18 are formed combinedly at two positions on the right and left sides of the rear end 16 a side of the lift frame 16 and at the center position of the front end 16 b of the lift frame 16 , namely total three positions, and three insulators 19 and 20 , which are dampers consisting of elastic material such as rubber, are fixed to these insulator fixing members 17 and 18 .
- the right and left insulators 19 fixed to the rear end 16 a of the lift frame 16 are fixed on the bottom 14 b of the chassis 14 with a fixing screw 21 inserted through the center of these insulators 19
- one insulator 20 fixed to the front end 16 b of the lift frame 16 is fixed on the end of the lift driving lever 23 with a fixing screw 22 inserted through the center of the insulator 20
- the lift driving lever 23 is disposed perpendicularly to the tray center P 1 and the base of the lift driving lever 23 is attached on the bottom 14 b of the chassis 14 with a pair of horizontal right and left support pins 24 so that the lift driving lever 23 is rotatable in the vertical direction namely in the direction of arrows b 1 and b 2 .
- the lift frame 16 is structured so as to be driven vertically in the direction of arrows c 1 and c 2 correspondingly to rotational movement in the vertical direction around the pair of right and left insulators 19 of the rear end 16 a side by the lift driving lever 23 .
- a shallow groove 25 is formed on the upper surface of the lift frame 16 .
- the loading mechanism 27 is mounted on one side of the front end 16 b side of the lift frame 16 on the bottom 14 b of the chassis 14 .
- the loading mechanism 27 is provided with a loading motor 28 , a pinion 29 which is rotated in forward-reverse direction by the loading motor 28 , a pinion lever 31 which moves a center shaft 29 a of the pinion 29 swingingly in the direction of arrows d 1 and d 2 in the horizontal plane around a vertical rocking lever shaft 30 , a cam lever 34 which is driven by the pinion lever 31 with interposition of a pair of partial gears 32 and rotated in the direction of the arrows e 1 and e 2 in the horizontal plane around a vertical rocking lever shaft 33 , a cam groove 35 formed circularly around the rocking lever shaft 33 of the cam lever 34 having a level difference in the vertical direction, and a cam driven pin 36 formed combinedly on one side of the end of the lift driving lever 23 and engaged movably in the cam groove 35 .
- the pinion 29 is
- the loading mechanism 27 allows the pinion 29 to move along the J-shaped rack 10 of the disc tray 2 by guiding the center shaft 29 a of the pinion 29 along the approximately J-shaped guide groove 11 of the disc tray 2 .
- the pinion 29 which is driven in forward-reverse direction by the loading motor 28 drives the linear portion 10 a of the rack 10 linearly toward the front panel 2 a side from the rear end 2 b side of the disc tray 2 and thereby draws the disc tray 2 in the optical disc drive 5 horizontal in the direction of the arrow a.
- the cam driven pin 36 of the lift driving lever 23 is elevated upward namely in the direction of the arrow b 1 in the cam groove 35 of the cam lever 34 , thereby the lift frame 16 is lifted upward in the direction of the arrow c 1 around the pair of right and left insulators 19 using the lift driving lever 23 with interposition of the insulator 20 from the lower position with downward inclination as shown in FIG. 15 to the lifted horizontal upper position as shown in FIG. 16.
- the cam lever 34 is rotated in the direction of the arrow e 2 while the pinion 29 which is reversibly rotated by the loading motor 28 is swung in the direction of the arrow d 2 along the circular portion 10 b of the rack 10 , the cam driven pin 36 is driven downward in the direction of the arrow b 2 namely downward along the cam groove 35 , and the lift driving lever 23 drives the lift frame 1 b downward in the direction of the arrow c 2 around the pair of right and left insulators 19 with interposition of the insulator 20 from the upper position shown in FIG. 16 to the lower position shown in FIG. 15.
- the pinion 29 drives linearly the linear portion 10 a of the rack 10 from the front panel 2 a side to the rear end 2 b of the disc tray 2 , and the disc tray 2 is pressed out in the direction of the arrow a 2 to the outside of the optical disc drive 5 .
- a spindle motor 39 is fixed vertically on the mounting member 38 formed at the position deviated to the front end 16 b , a disc table 40 consisting of magnetic metal material such as stainless steel is fixed on the top end of the motor shaft 39 a .
- a conical trapezoid centering guide 40 a to be engaged into the center hole 1 a of the optical disc 1 is formed combinedly on the upper center of the disc table.
- An optical pickup 41 is fixed horizontally on the rear side from the spindle motor 39 in the shallow groove 25 of the lift frame 16 .
- the optical pickup 41 has a carriage 44 on which an objective lens 42 and light reflection type skew sensor 43 are fixed upward vertically, and an optical block 45 for transmitting a laser beam to the objective lens is fixed combinedly on the side of the carriage 44 .
- a carriage moving mechanism 47 for moving linearly the carriage 44 in the direction of the arrows a 1 and a 2 along a pair of right and left guide shafts 46 is fixed on the lift frame 16 , and the carriage moving mechanism 47 is provided with a pinion 50 which is rotationally driven forward-reversibly by a carriage driving motor 48 with interposition of a gear train 49 and a rack 51 fixed on one side of the carriage 44 which rack 51 is driven linearly by the pinion 50 .
- the spindle motor 39 and the objective lens 42 are disposed on the tray center P 1 , and the mechanism is structured so that the objective lens is moved in the direction of the arrows a 1 and a 2 along the tray center P 1 .
- a disc chucking device 61 for chucking an optical disc 1 on the disc table 40 has a structure described herein under.
- a pulley support member 62 formed of synthetic resin is spanned between the top ends of the right and left side plates 14 a of the chassis 14 across the upper space of the disc tray 2 , and a chucking pulley 63 formed of synthetic resin in the form of disc is held horizontally in a circular hole 64 formed at the position just above the disc table 40 and at the center position of the pulley support member 62 movably in the vertical and horizontal direction within a certain range.
- a horizontal pillow block 62 a for supporting the horizontal flange 63 a formed combinedly to the periphery of the upper edge of the chucking pulley 63 thereon is formed combinedly to the periphery of the circular hole 64 of the pulley support member 62 .
- a disc magnet 65 is embedded at the center of the chucking pulley 63 .
- a top cover 26 consisting of magnetic material such as metal plate is attached across the pulley support member 62 in the upper space of the chassis 14 .
- the optical disc 1 is lifted upward in the direction of the arrow b 1 in the pit 3 of the disc tray 2 , simultaneously the chucking pulley 63 is lifted upward in the direction of the arrow b 1 together with the optical disc 1 , and the flange 63 a is lifted upward to the space above the pulley pillow block 62 a of the pulley support member 62 , when, the chunking pulley 63 chucks the optical disc 1 horizontal on the disc table 40 from the direction of the arrow b 2 by means of magnetic attraction of the magnet 65 of the chucking pulley 63 to the disc table 40 .
- the spindle motor 39 rotates the optical disc 1 at high speed in response to a recording and/or reproducing command signal supplied from the host computer, the carriage 44 of the optical pickup 41 is moved in the direction of the arrows a 1 and a 2 by the carriage moving mechanism 47 , and the objective lens 42 is moved in the direction of the arrows a 1 and a 2 along the tray center P 1 .
- a laser beam emitted from the optical block 45 irradiated onto the bottom face of the optical disc 1 through the objective lens 42 , and the reflective beam is received by the optical block 45 through the objective lens 42 , thereby the data of the optical disc 1 is recorded and/or reproduced.
- the pinion 50 which is driven forward-reversibly by the carriage driving motor 48 with interposition of the gear train 49 drives linearly the rack 51 , thereby the carriage moving mechanism 47 moves the carriage 44 in the direction of the arrows a 1 and a 2 along the pair of right and left guide shafts 46 .
- the lift frame 16 is lowered in the direction of the arrow c 2 up to the lower position in response to an unloading command signal supplied from the host computer as shown in FIG.
- the disc table 40 is isolated downward from the optical disc 1 and the chucking pulley 63 , thereafter the optical disc 1 is placed horizontally in the pit 3 of the disc tray 2 , and the optical disc 1 is unloaded horizontally in the direction of the arrow a 2 to the outside of the optical disc drive 5 by the disc tray 2 .
- the flange 63 a of the chucking pulley 63 is brought into a contact with the pulley pillow block 62 a of the pulley support member 62 in the direction of the arrow b 2 and brought to a stop when the disc table 40 is lowered in the direction of the arrow c 2 , as the result, the disc table 40 is separated forcedly from the chucking pulley 63 against magnetic attraction force of the magnet 65 .
- the circular hole 64 is formed at the center of the pulley support member 62 provided horizontally beneath the top cover 26 across over the chassis 14 , and the chucking pulley 63 is pressed in the circular hole movably in the vertical and horizontal direction within a certain range, the pulley support member 62 supports the periphery of the chucking pulley 63 .
- optical disc drive 5 of this sort two types of use have been practically employed.
- One is the horizontal type in which the apparatus is placed horizontally on a desk for using and the other is the vertical type in which the apparatus is placed vertically on a desk for using.
- the vertical use when an optical disc 1 is loaded or unloaded by the disc tray 2 , the optical disc 1 moved toward the chucking pulley 63 from the disc tray 2 (shifted horizontally), and the top surface of the optical disc 1 (the side facing to the chucking pulley) can happen to be in contact with the chucking pulley 63 and the pulley support member 62 .
- the present invention has been accomplished in order to solve the above-mentioned problem, it is the object of the present invention to provide a disc chucking device of an optical disc drive for eliminating occurrence of scratching due to a contact of the top surface of an optical disc with a pulley support member even if the optical disc is lifted part from a disc tray when the optical disc is loaded or unloaded in the case that the optical disc drive is in vertical use.
- the disc chucking device of an optical disc drive of the present invention is provided with a first magnetic attraction means for drawing down a chucking pulley to the disc table side when the disc table is lifted from the lower position to the upper position after an optical disc is loaded, and a second magnetic attraction means for drawing up the chucking pulley from the pulley support member when the disc table is drawn down from the upper position to the lower position to unload the optical disc, and further the pulley support member is structured with a centering guide which supports the center of the chucking pulley.
- the disc chucking device of an optical disc drive of the present invention having the structured described herein above is capable of keeping the chucking pulley above the pulley support member using the second magnetic attraction means in unloading state of an optical disc, the optical disc will not receive interference from the chucking pulley when the disc tray loads the optical disc. Because the chucking pulley can be drawn down strongly toward the pulley support member by the first magnetic attraction means when the disc table is lifted from the lower position to the upper position after loading of the optical disc, the optical disc can be chucked strongly on the disc table by the chucking pulley.
- the chucking pulley can be kept above the pulley support member when the optical disc is unloaded, the clearance to be secured in unloading between the chucking pulley and the optical disc is reduced to a clearance L 8 which is sufficiently smaller than L 1 +L 2 in the previously applied invention. Because the pulley support member is structured with the centering guide which supports the center of the chucking pulley, the top surface of the optical disc is prevented from being scratched due to contact with the centering guide even if the optical disc is lifted far apart from the disc tray when the optical disc is loaded and unloaded in the case that the optical disc drive is placed vertically for use.
- FIG. 1 is an enlarged partial cross sectional side view in unloading operation for illustrating the first embodiment of a disc chucking device of an optical disc drive in accordance with the present invention.
- FIG. 2 is an enlarged partial cross sectional view in disc chucking operation of the disc chucking device shown in FIG. 1.
- FIG. 3 is a partially cut away plan view of a chucking pulley of the disc chucking device shown in FIG. 1.
- FIG. 4 is a cross sectional side view in unloading operation of the whole optical disc drive shown in FIG. 1.
- FIG. 5 is a cross sectional side view in disc chucking operation of the whole optical disc drive shown in FIG. 1.
- FIG. 6 is an enlarged partial cross sectional side view in unloading operation for illustrating the second embodiment of a disc chucking device of an optical disc drive in accordance with the present invention.
- FIG. 7 is an enlarged partial cross sectional view in disc chucking operation of the disc chucking device shown in FIG. 6.
- FIG. 8 is a cross sectional side view for illustrating the third embodiment of a disc chucking device of an optical disc drive in accordance with the present invention.
- FIG. 9A and FIG. 9B are cross sectional views for illustrating the fourth embodiment of a disc chucking device of an optical disc drive in accordance with the present invention.
- FIG. 10A and FIG. 10B are cross sectional views for illustrating the fifth embodiment of a disc chucking device of an optical disc drive in accordance with the present invention.
- FIG. 11 is a partially cut away plan view for illustrating an optical disc drive in accordance with the previously applied invention.
- FIG. 12 is an exploded perspective view for illustrating a chucking pulley, clamp support plate, disc tray, and disc table of the optical disc drive in accordance with the previously applied invention.
- FIG. 13 is an exploded perspective view for illustrating a head moving mechanism and a lift frame of the optical disc drive in accordance with the previously applied invention.
- FIG. 14 is an exploded perspective view for illustrating a loading mechanism and a chassis of the optical disc drive in accordance with the previously applied invention.
- FIG. 15 is a cross sectional side view in unloading operation of the optical disc drive in accordance with the previously applied invention.
- FIG. 16 is a cross sectional side view in disc chucking operation of the optical disc drive in accordance with the previously applied invention.
- FIG. 17 is a perspective view in unloading operation of the whole optical disc drive in accordance with the previously applied invention.
- FIG. 18 is a perspective view in loading operation of the whole optical disc drive in accordance with the previously applied invention.
- FIGS. 11 to 18 Embodiments of a disc chucking device of an optical disc drive in accordance with the present invention will be described in detail hereinafter with reference to FIGS. 1 to 7 .
- the same components as shown in FIGS. 11 to 18 are given the same characters as shown in FIGS. 11 to 18 , and duplicated description is omitted.
- a disc chucking device of the first-embodiment of the present invention will be described with reference to FIGS. 1 to 5 .
- the disc chucking device 161 is provided with the first magnetic attraction means 67 for drawing down a chucking pulley 163 in the direction of the arrow b 2 with a strong magnetic attraction force in the direction of the arrow b 2 to the space beneath the pulley support member 162 , and the second magnetic attraction means 72 for drawing up the chucking pulley 163 with a weak magnetic attraction force in the direction of the arrow b 1 to the space above the pulley support member 162 .
- the first magnetic attraction means 67 comprises the first magnet 68 and the first yoke 69 formed in the ring shape having the same diameter, the first yoke 69 is placed horizontally on the top surface of the first magnet 68 in close contact, and the first magnet 68 and the first yoke 169 which are in close contact are embedded horizontally and co-axially on the periphery of the center P 2 at the center portion 163 b of the chucking pulley 163 .
- the second magnetic attraction means 71 is composed of the disc-shaped second magnet 72 having a smaller diameter than that of the first magnet 68 , the second magnet 72 is embedded horizontally at the center P 2 of the central portion 163 b of the chucking pulley 163 at the level higher than the first yoke 69 .
- the magnetic attraction, namely the magnetic force, of the first magnet 68 is strengthened by magnetizing the first magnet 68 to have S namely the S pole and N namely the N pole on both ends of the first magnet 68 in the diametrical direction f.
- the magnetic attraction force of the second magnet 72 is structured so as to be weaker than the magnetic attraction force of the first magnet 68 .
- a magnetic attraction target of the first magnetic attraction means 67 consists of metal magnetic material such as stainless steel, and this target is a disc table 40 disposed beneath the chucking pulley 163 .
- a magnetic attraction target of the second magnetic attraction means 71 consists of magnetic material such as metal plate, and the top cover 26 fixed horizontally above the chucking pulley 163 functions also as the magnetic attraction target.
- a conical trapezoid center pit 163 c having a larger diameter than that of the center ring guide 40 a of the disc table 40 is formed on the bottom side of the center portion 63 b of the chucking pulley 163 , a center pin 163 d is formed combinedly downward vertically at the center P 2 of the center pit 163 c , and a center hole 40 b is formed at the center P 2 of the center ring guide 40 a of the disc table 40 .
- the first embodiment of the disc chucking device 161 of the present invention is structured as described herein above, as shown in FIG. 1 and FIG. 4, in unloading operation of the optical disc 1 , a magnetic attraction force F 2 which is directed upward namely in the direction of the arrow b 1 generated by a magnetic flux ⁇ 2 having a low magnetic flux density is generated between the second magnet 72 of the second magnetic attraction means 71 and the top cover 26 consisting of magnetic material, and the weak magnetic attraction force F 2 draws up the chucking pulley 163 in the direction of the arrow b 1 to the space above the support member 162 .
- the optical disc 1 in loading operation of the optical disc 1 , the optical disc 1 is loaded horizontally from the direction of the arrow a 1 in the optical disc drive 5 by the disc tray 2 , when, the optical disc 1 is loaded safely without any interference of the chucking pulley 163 due to the existence of the clearance L 4 .
- the optical disc 1 After loading of the optical disc 1 , as shown in FIG. 2 and FIG.
- the center ring guide 40 a of the disc table 40 consisting of magnetic material takes an access to the first magnet 68 of the first magnetic attraction means 67 , and a strong magnetic attraction force F 1 generated by magnetic flux ⁇ 1 between the first magnet 68 , first yoke 67 , and the centering guide 40 a is generated downward in the direction of the arrow b 2 .
- the magnetic attraction force F 1 of the first magnetic attraction means 67 is a strong magnetic attraction force F 1 which is stronger than the second magnetic attraction means 71 , therefore, the chucking pulley 163 is drawn down by the clearance L 6 in the direction of the arrow b 2 to the space beneath the pulley support member 162 , thereby, the optical disc 1 is chucked horizontally on the disc table 40 strongly and stably by the chucking pulley 163 . In this chucking state of the optical disc 1 , the flange 163 a of the chucking pulley 163 is distant apart by the clearance L 7 above the pulley pillow block 162 a of the pulley support member 162 .
- the optical disc 1 is chucked strongly on the disc table 40 as described herein above, even when the optical disc 1 is rotated at high speed by the disc table 40 of the spindle motor 39 , the optical disc 1 does not slip and is rotated stably at high speed, the information is high density recorded and/or reproduced precisely at high speed rotation in the optical disc 1 such as DVD-ROM.
- the disc table 40 is lowered together with the spindle motor 39 from the upper position to the lower position in the direction of the arrow c 2 by the lift frame 16 , and the disc table 40 is moved apart from the optical disc 1 in the direction of the arrow c 2 .
- the clearance L 8 between the top surface of the optical disc 1 which is placed horizontally in the pit 3 of the disc tray 2 for loading and/or unloading and the bottom surface of the chucking pulley 163 can be reduced in comparison with the clearance L 1 +L 2 in the previously applied invention by the clearance L 3 , which is the drawn up distance of the chucking pulley 163 from the pulley support member 162 .
- the first magnetic attraction means 67 which magnetically attracts the chucking pulley 163 in the direction of the arrow b 2 to the disc table 40 side comprises the first ring magnet 68 and the first ring yoke 69 which is in close contact horizontally with the top surface of the first magnet 68 , and the first magnet 68 is magnetized to have S namely S-pole and N namely N-pole on both ends of the first magnet 68 in the diametrical direction f, thereby, the strong magnetic attraction force is generated consistently with least leakage magnetic flux between the first magnet 68 and the centering guide 40 a of the disc table 40 .
- the magnetic attraction force F 1 of the first magnetic attraction means 67 is served as a strong magnetic attraction force which is stronger consistently than the magnetic attraction force F 2 of the second magnetic attraction means 71 , the strong magnetic attraction force F 1 draws down strongly the chucking pulley 163 in the direction of the arrow b 2 , and as the result, the optical disc 1 is chucked strongly and stably on the disc table 40 horizontally.
- the first and second magnets 68 and 72 which are independent each other are provided to the first and second magnetic attraction means 67 and 71 respectively, and the magnetic flux of the first and second magnets 58 and 72 are adjusted, thereby, the magnetic attraction forces F 1 and F 2 are adjusted simply and without any restriction, therefore, the chucking operation after loading of the optical disc 1 and drawing up operation of the chucking pulley 163 for unloading of the optical disc 1 are performed consistently.
- the centering pin 74 which extends downward from the top cover 26 forms the centering member, and the centering member forms the pulley support member.
- the top end of the centering pin 74 is fixed to the top cover 26 , and the bottom end side of the centering pin 74 which extends downward from the top cover 26 is inserted into the center hole 75 formed at the center of the top surface of the chucking pulley 263 .
- a large diameter hole 76 is formed under the center hole 75 of the chucking pulley 263 , and a slip down preventing flange 77 is formed on the periphery of the bottom end of the centering pin 74 .
- the diameter of the centering pin 74 relative to the diameter of the center hole 75 , the diameter of the large hole 76 relative to the diameter of the flange 77 , and the vertical depth of the large diameter hole 76 relative to the vertical thickness of the flange 77 are made large sized, thereby, the chucking pulley 263 is supported by the centering pin 74 movable as desired in the vertical and horizontal direction in a certain range.
- the second magnet 72 having weak magnetic attraction is embedded co-axially on the periphery of the center hole 75 on the top surface of the chucking pulley 263 .
- the centering pin 74 which is a component of the pulley support member supports the center of the chucking pulley 263 , therefore, in the case that the optical disc drive 5 is placed vertically on a desk for use, when the optical disc 1 is loaded and/or unloaded, the optical disc 1 is lifted far apart upward (to chucking pulley side) from the disc tray 2 , as the result, possible contact of the top surface 1 b of the optical disc 1 with the chucking pulley 263 will not cause contact of the top surface 1 b of the optical disc 1 with the centering pin 74 which is fixed to the top cover 26 , and thus does not cause any scratching on the top surface.
- the second embodiment of the disc chucking device of the present invention even in the case that an optical disc 1 such as DVD in which the information is recorded on both top and bottom sides is used, when the optical disc 1 is loaded and/or unloaded the top surface 1 b of the optical disc 1 will not be scratched, not only on the bottom surface 1 c but also on the top surface 1 b of the optical disc 1 , the information is recorded and/or reproduced highly precisely, and thus the optical disc drive 5 excellent in performance and reliability is realized.
- an optical disc 1 such as DVD in which the information is recorded on both top and bottom sides
- the chucking pulley 363 is formed of synthetic resin, and the cylindrical center portion 363 b having embedded first and second magnets 68 and 72 and first yoke 69 , a disc-shaped disc crimp plate 363 e formed horizontally on the periphery of the bottom end of the center portion 363 b , a cylindrical peripheral wall portion 363 f which rises upward from the periphery of the disc crimp plate 363 e, and a disc-shaped flange having a small diameter provided inside the peripheral wall portion 363 f formed horizontally on the periphery of the top end of the center portion 363 b are formed combinedly with the chucking pulley 363 .
- the pulley support member 362 made of plate metal having a small diameter is attached on the bottom surface of the top cover 26 made of plate metal, the pulley pillow block 362 a formed horizontally inside the bottom end of the pulley support member 362 is inserted in the inside of the peripheral wall portion 363 f of the chucking pulley 363 to dispose it beneath the flange 363 a , the center portion 363 b of the chucking pulley 363 a is engaged with allowance in the vertical and horizontal direction in the circular hole 64 formed inside the pulley pillow block 362 a , and the pulley support member 62 supports the chucking pulley 63 movable in the vertical and horizontal direction within a certain range.
- the chucking pulley 362 is supported by the pulley support member 62 inserted into the inside of the peripheral wall portion 363 f , in the case that the optical disc drive 5 is placed vertically on a desk for using, when the optical disc 1 is loaded and/or unloaded, the optical disc 1 is lifted far apart to the pulley support member 362 side in the pit 3 of the disc tray 2 , and even if the optical disc 1 happens to contact on the pulley support member 362 made of plate metal, the optical disc 1 is prevented from being in contact directly with the pulley support member 362 by the disc crimp plate 363 e and the peripheral wall portion 363 f which are formed combinedly with the checking pulley 363 made of synthetic resin and cover the under side and periphery of the pulley support member 362 .
- the optical disc 1 consists of synthetic resin, and if the pulley support member 362 is made of plate metal, and the optical disc 1 happens to contact directly with the pulley support member 362 fixed at the prescribed position, then the optical disc 1 is scratched strongly with the hard pulley support member 362 made of plate metal and the scratching causes easily a serious damage (large scratch is easily caused) on the optical disc 1 .
- the disc chucking device of the present invention because the under side and periphery of the pulley support member 362 made of plate metal is covered by the disc crimp plate 363 e and the peripheral wall portion 363 f of the chucking pulley 363 , direct contact of the optical disc 1 with the pulley support member 362 and resultant serious damage on the optical disc 1 is prevented, and high safety is secured. Because the pulley support member 362 has a small diameter and it is inserted in the inside of the peripheral wall portion 363 f of the chucking pulley 363 , as shown in FIG. 1 and FIG. 2, the space factor of the peripheral portion of the chucking pulley 363 in the inside of the optical disc drive 5 is improved, and the improved space factor is favorable for realizing a small-sized light-weight optical disc drive 5 .
- the top cover 2 consisting of magnetic material is formed combinedly with the clamp support member 462 formed in the form of cylindrical recess, the cylindrical center shaft 101 formed combinedly on the upper center of the disc clamp 463 is inserted through the circular hole 64 formed at the center of the clamp support member from the bottom to the top, and the stopper ring 164 attached horizontally on the periphery of the top end of the center shaft 101 is disposed above the clamp support member 462 .
- the weak magnet 472 embedded in the form of ring on the top side of the disc clamp 463 and the clamp support member 462 which is a component of the yoke constitute a means for pressing upward the disc clamp 463 to the upper position
- the strong magnet 468 is embedded in the form of ring on the bottom side of the disc clamp 463 .
- the weak magnetic attraction force exerted between the weak magnet 472 and the clamp support 462 lifts the disc clamp 463 to the position where the disc clamp 463 is brought into a contact with the bottom end of the clamp support member 462 when the optical disc 1 is unloaded.
- the ring recess 168 is formed at the position which is facing to the magnet 472 on the bottom surface of the clamp support member 462 so that the magnet 472 is attracted to the clamp support member 462 with interposition of a space.
- the projection guide 114 is provided to the above-mentioned cover 115 , the recess guide groove 121 is provided above the cramp support member 462 , and positioning is performed by the guide 114 and the guide groove 121 similarly.
- FIGS. 10A and 10B the fifth embodiment of the disc clamp used in the present invention is shown in FIGS. 10A and 10B.
- a ring-shaped gap 167 is provided above the ring-shaped magnet 568 embedded at the center of the disc clamp 563 , thereby, using one magnet 568 , the disc clamp 563 is magnetically attracted upward in unloading operation, on the other hand, the disc clamp 563 is magnetically attracted downward in chucking operation as shown in FIG. 10(B) and the disc clamp 563 chucks the optical disc 1 on the disc table 40 , the same components as described in the embodiment shown in FIG. 9 are given the same characters, and the embodiment shown in FIGS. 10A and 10B exhibits the same operation and effects.
- the disc clamp may be pressed up using controllable electromagnetic force when the optical disc is unloaded.
Landscapes
- Holding Or Fastening Of Disk On Rotational Shaft (AREA)
Abstract
A disc chucking device comprises a first magnet for drawing down a chucking pulley downward toward the pulley support member when a disc is chucked comprises the first magnet embedded at the center of the chucking pulley and the first yoke provided in close contact with the upper side of the first magnet, and a second magnet for drawing up the chucking pulley from the pulley support member when a disc is unloaded comprises the second magnet embedded at the level position upper than that of the first yoke at the center of the chucking pulley and a top cover. Disc chucking is performed strongly and the whole optical disc drive is made thin.
Description
- 1. Field of the Invention
- This invention relates to a disc chucking device of an optical disc drive which loads an optical disc using a disc tray, and chucks the loaded optical disc on a disc table using a chucking pulley.
- 2. Description of Related Art
- A sort of optical disc drive which the inventors of the present invention have applied is described with reference to FIGS.11 to 18. In detail, as shown in FIG. 17, an
optical disc 1 is placed horizontally in apit 3 formed on the upper surface of adisc tray 2, thereafter, when afront panel 2 a of thedisc tray 2 is pressed lightly in the direction indicated by an arrow a1, a loading switch (not shown in the drawing) is turned on, thedisc tray 2 is drawn horizontally from the direction indicated by the arrow a1 namely the loading direction into the optical disc drive through atray gate 4 by means of a loading mechanism which will described hereinafter as shown in FIG. 18, and as the result, theoptical disc 1 is automatically loaded horizontally on a disc table of a spindle motor. - After loading, the
optical disc 1 is rotated at high speed by the spindle motor in response to a recording and/or reproducing command signal supplied from a host computer, data in theoptical disc 1 is recorded and/or reproduced by an optical pickup. After reproduction of theoptical disc 1, thedisc tray 2 is unloaded automatically in the direction of the arrow a2 namely the unloading direction to the outside of the optical disc drive through thetray gate 4 in response to an unloading command signal supplied from the host computer as shown in FIG. 17. - Next, as shown in FIGS.11 to 16, the
disc tray 2 consists of synthetic resin, and a slottedhole bottom aperture 8 is formed along a tray center P1 extending from the center of thepit 3 to therear end 2 b side. A pair of right andleft guide rails 9 is formed combinedly in parallel to the tray center P1 on the right and left side edges of thedisc tray 2. On one end of the bottom surface of thedisc tray 2, J-shapedparallel rack 10 andguide groove 11 are formed combinedly. Thelinear portions 10 a and 11 a of therack 10 and theguide groove 11 are formed in parallel to the tray center P1, and on the end of thefront panel 2 a side, thecircular portions - Next, a box-shaped chassis formed of synthetic resin is provided in the internal of the
optical disc drive 5, and the pair of right andleft guide rails 9 of thedisc tray 2 is guided by a plurality oftray guides 15 formed combinedly on the inside of the right andleft side plates 14 a of thechassis 14 and slid in the direction of arrows a1 and a2. Alift frame 16 formed of synthetic resin is attached on thebottom 14 b of thechassis 14.Insulator fixing members rear end 16 a side of thelift frame 16 and at the center position of thefront end 16 b of thelift frame 16, namely total three positions, and threeinsulators insulator fixing members - The right and
left insulators 19 fixed to therear end 16 a of thelift frame 16 are fixed on thebottom 14 b of thechassis 14 with afixing screw 21 inserted through the center of theseinsulators 19, oneinsulator 20 fixed to thefront end 16 b of thelift frame 16 is fixed on the end of thelift driving lever 23 with afixing screw 22 inserted through the center of theinsulator 20. Thelift driving lever 23 is disposed perpendicularly to the tray center P1 and the base of thelift driving lever 23 is attached on thebottom 14 b of thechassis 14 with a pair of horizontal right andleft support pins 24 so that thelift driving lever 23 is rotatable in the vertical direction namely in the direction of arrows b1 and b2. - In other words, the
lift frame 16 is structured so as to be driven vertically in the direction of arrows c1 and c2 correspondingly to rotational movement in the vertical direction around the pair of right andleft insulators 19 of therear end 16 a side by thelift driving lever 23. Ashallow groove 25 is formed on the upper surface of thelift frame 16. - The
loading mechanism 27 is mounted on one side of thefront end 16 b side of thelift frame 16 on thebottom 14 b of thechassis 14. Theloading mechanism 27 is provided with aloading motor 28, apinion 29 which is rotated in forward-reverse direction by theloading motor 28, apinion lever 31 which moves acenter shaft 29 a of thepinion 29 swingingly in the direction of arrows d1 and d2 in the horizontal plane around a verticalrocking lever shaft 30, acam lever 34 which is driven by thepinion lever 31 with interposition of a pair ofpartial gears 32 and rotated in the direction of the arrows e1 and e2 in the horizontal plane around a verticalrocking lever shaft 33, acam groove 35 formed circularly around the rockinglever shaft 33 of thecam lever 34 having a level difference in the vertical direction, and a cam drivenpin 36 formed combinedly on one side of the end of thelift driving lever 23 and engaged movably in thecam groove 35. Thepinion 29 is engaged in therack 10 of thedisc tray 2, and thecenter shaft 29 a of thepinion 29 is engaged movably in theguide groove 11. - The
loading mechanism 27 allows thepinion 29 to move along the J-shaped rack 10 of thedisc tray 2 by guiding thecenter shaft 29 a of thepinion 29 along the approximately J-shaped guide groove 11 of thedisc tray 2. In detail, when a disc is loaded on thedisc tray 2, thepinion 29 which is driven in forward-reverse direction by theloading motor 28 drives thelinear portion 10 a of therack 10 linearly toward thefront panel 2 a side from therear end 2 b side of thedisc tray 2 and thereby draws thedisc tray 2 in theoptical disc drive 5 horizontal in the direction of the arrow a. Continuous forward rotation of thepinion 29 by theloading motor 28 allows thepinion 29 to swing in the direction of the arrow d along thecircular portion 10 b of therack 10, when, thepinion lever 31 rotates thecam lever 34 in the direction of the arrow e1 with interposition of the pair ofpartial gears 32. - The cam driven
pin 36 of thelift driving lever 23 is elevated upward namely in the direction of the arrow b1 in thecam groove 35 of thecam lever 34, thereby thelift frame 16 is lifted upward in the direction of the arrow c1 around the pair of right andleft insulators 19 using thelift driving lever 23 with interposition of theinsulator 20 from the lower position with downward inclination as shown in FIG. 15 to the lifted horizontal upper position as shown in FIG. 16. When thedisc tray 2 is unloaded, the reversed loading operation is operated, in detail, thecam lever 34 is rotated in the direction of the arrow e2 while thepinion 29 which is reversibly rotated by theloading motor 28 is swung in the direction of the arrow d2 along thecircular portion 10 b of therack 10, the cam drivenpin 36 is driven downward in the direction of the arrow b2 namely downward along thecam groove 35, and thelift driving lever 23 drives thelift frame 1 b downward in the direction of the arrow c2 around the pair of right andleft insulators 19 with interposition of theinsulator 20 from the upper position shown in FIG. 16 to the lower position shown in FIG. 15. In continuous reverse rotation of thepinion 29 driven by theloading motor 28, thepinion 29 drives linearly thelinear portion 10 a of therack 10 from thefront panel 2 a side to therear end 2 b of thedisc tray 2, and thedisc tray 2 is pressed out in the direction of the arrow a2 to the outside of theoptical disc drive 5. - In the
shallow groove 25 of thelift frame 16, aspindle motor 39 is fixed vertically on themounting member 38 formed at the position deviated to thefront end 16 b, a disc table 40 consisting of magnetic metal material such as stainless steel is fixed on the top end of themotor shaft 39 a. A conicaltrapezoid centering guide 40 a to be engaged into thecenter hole 1 a of theoptical disc 1 is formed combinedly on the upper center of the disc table. Anoptical pickup 41 is fixed horizontally on the rear side from thespindle motor 39 in theshallow groove 25 of thelift frame 16. Theoptical pickup 41 has acarriage 44 on which anobjective lens 42 and light reflectiontype skew sensor 43 are fixed upward vertically, and anoptical block 45 for transmitting a laser beam to the objective lens is fixed combinedly on the side of thecarriage 44. - A
carriage moving mechanism 47 for moving linearly thecarriage 44 in the direction of the arrows a1 and a2 along a pair of right andleft guide shafts 46 is fixed on thelift frame 16, and thecarriage moving mechanism 47 is provided with apinion 50 which is rotationally driven forward-reversibly by acarriage driving motor 48 with interposition of agear train 49 and arack 51 fixed on one side of thecarriage 44 whichrack 51 is driven linearly by thepinion 50. Thespindle motor 39 and theobjective lens 42 are disposed on the tray center P1, and the mechanism is structured so that the objective lens is moved in the direction of the arrows a1 and a2 along the tray center P1. - A
disc chucking device 61 for chucking anoptical disc 1 on the disc table 40 has a structure described herein under. - In detail, a
pulley support member 62 formed of synthetic resin is spanned between the top ends of the right andleft side plates 14 a of thechassis 14 across the upper space of thedisc tray 2, and achucking pulley 63 formed of synthetic resin in the form of disc is held horizontally in acircular hole 64 formed at the position just above the disc table 40 and at the center position of thepulley support member 62 movably in the vertical and horizontal direction within a certain range. Ahorizontal pillow block 62 a for supporting thehorizontal flange 63 a formed combinedly to the periphery of the upper edge of thechucking pulley 63 thereon is formed combinedly to the periphery of thecircular hole 64 of thepulley support member 62. Adisc magnet 65 is embedded at the center of thechucking pulley 63. Atop cover 26 consisting of magnetic material such as metal plate is attached across thepulley support member 62 in the upper space of thechassis 14. - Therefore, when a disc is loaded, the
chucking pulley 63 is lowered downward to the space under thepulley support member 62 with the dead load as shown in FIG. 15, theflange 63 a of thechucking pulley 63 is hung in contact with the top of thepulley pillow block 62 a of thepulley support member 62, theoptical disc 1 is placed horizontally in thepit 3 of thedisc tray 2, and theoptical disc 1 is loaded horizontally in the direction of the arrow a1 into theoptical disc drive 5 by thedisc tray 2. After loading, as shown in FIG. 1, when thelift frame 16 is lifted in the direction of the arrow c1 up to the upper horizontal position, the disc table 40 is inserted upward from thebottom aperture 8 of thedisc tray 2, and acenter ring guide 40 a of the disc table 40 is engaged upward into thecenter hole 1 a of theoptical disc 1. Theoptical disc 1 is lifted upward in the direction of the arrow b1 in thepit 3 of thedisc tray 2, simultaneously thechucking pulley 63 is lifted upward in the direction of the arrow b1 together with theoptical disc 1, and theflange 63 a is lifted upward to the space above thepulley pillow block 62 a of thepulley support member 62, when, thechunking pulley 63 chucks theoptical disc 1 horizontal on the disc table 40 from the direction of the arrow b2 by means of magnetic attraction of themagnet 65 of thechucking pulley 63 to the disc table 40. - The
spindle motor 39 rotates theoptical disc 1 at high speed in response to a recording and/or reproducing command signal supplied from the host computer, thecarriage 44 of theoptical pickup 41 is moved in the direction of the arrows a1 and a2 by thecarriage moving mechanism 47, and theobjective lens 42 is moved in the direction of the arrows a1 and a2 along the tray center P1. A laser beam emitted from theoptical block 45 irradiated onto the bottom face of theoptical disc 1 through theobjective lens 42, and the reflective beam is received by theoptical block 45 through theobjective lens 42, thereby the data of theoptical disc 1 is recorded and/or reproduced. - The
pinion 50 which is driven forward-reversibly by thecarriage driving motor 48 with interposition of thegear train 49 drives linearly therack 51, thereby thecarriage moving mechanism 47 moves thecarriage 44 in the direction of the arrows a1 and a2 along the pair of right andleft guide shafts 46. Thelift frame 16 is lowered in the direction of the arrow c2 up to the lower position in response to an unloading command signal supplied from the host computer as shown in FIG. 15, and the disc table 40 is isolated downward from theoptical disc 1 and thechucking pulley 63, thereafter theoptical disc 1 is placed horizontally in thepit 3 of thedisc tray 2, and theoptical disc 1 is unloaded horizontally in the direction of the arrow a2 to the outside of theoptical disc drive 5 by thedisc tray 2. When, theflange 63 a of thechucking pulley 63 is brought into a contact with thepulley pillow block 62 a of thepulley support member 62 in the direction of the arrow b2 and brought to a stop when the disc table 40 is lowered in the direction of the arrow c2, as the result, the disc table 40 is separated forcedly from thechucking pulley 63 against magnetic attraction force of themagnet 65. - In the
exemplary chucking device 61 of the previously applied invention, as shown in FIG. 15, when anoptical disc 1 is loaded or unloaded horizontally in the direction of the arrows a1 and a2 by thedisc tray 2, thechucking pulley 63 is lowered to the space beneath thepulley support member 62 with the dead load and theflange 63 a of thechucking pulley 63 is hung in a contact with the top of thepulley pillow block 62 a of thepulley support member 62, therefore when anoptical disc 1 is loaded or unloaded, a clearance L should be secured between the bottom surface of thehung chucking pulley 63 and the top surface of theoptical disc 1 placed horizontally in thepit 3 of thedisc tray 2 so that theoptical disc 1 does not interfere with thechucking pulley 63. Therefore, in the example of an optical disc drive of the previously applied invention, when anoptical disc 1 is loaded or unloaded, in order to secure further a clearance L between thechucking pulley 63 and theoptical disc 1 in the state that thechucking pulley 63 is lowered from thepulley support member 62 by the clearance L2, a large space namely L1+L2 is necessary between thepulley support member 62 and the top surface of theoptical disc 1, as the result, the space causes the large total thickness T of theoptical disc drive 5, and the large thickness is a problem. - In the exemplary
disc chucking device 61 of the previously applied invention, thecircular hole 64 is formed at the center of thepulley support member 62 provided horizontally beneath thetop cover 26 across over thechassis 14, and thechucking pulley 63 is pressed in the circular hole movably in the vertical and horizontal direction within a certain range, thepulley support member 62 supports the periphery of thechucking pulley 63. - On the other hand, two types of use of
optical disc drive 5 of this sort have been practically employed. One is the horizontal type in which the apparatus is placed horizontally on a desk for using and the other is the vertical type in which the apparatus is placed vertically on a desk for using. In particular, in the case of the vertical use, when anoptical disc 1 is loaded or unloaded by thedisc tray 2, theoptical disc 1 moved toward thechucking pulley 63 from the disc tray 2 (shifted horizontally), and the top surface of the optical disc 1 (the side facing to the chucking pulley) can happen to be in contact with thechucking pulley 63 and thepulley support member 62. If the top surface of theoptical disc 1 contacts with thepulley support member 62 fixed to thechassis 14, a scratch is caused on the top surface of theoptical disc 1 due to a large contact resistance. Particularly in the case of anoptical disc 1 for DVD (digital video disc) having information on both top and bottom surfaces, if scratching is caused on the top information recorded surface due to contact with thepulley support member 62, then the information can be impossible to be recorded and/or reproduced, this is a serious problem. - The present invention has been accomplished in order to solve the above-mentioned problem, it is the object of the present invention to provide a disc chucking device of an optical disc drive for eliminating occurrence of scratching due to a contact of the top surface of an optical disc with a pulley support member even if the optical disc is lifted part from a disc tray when the optical disc is loaded or unloaded in the case that the optical disc drive is in vertical use.
- To achieve the above-mentioned object, the disc chucking device of an optical disc drive of the present invention is provided with a first magnetic attraction means for drawing down a chucking pulley to the disc table side when the disc table is lifted from the lower position to the upper position after an optical disc is loaded, and a second magnetic attraction means for drawing up the chucking pulley from the pulley support member when the disc table is drawn down from the upper position to the lower position to unload the optical disc, and further the pulley support member is structured with a centering guide which supports the center of the chucking pulley.
- Because the disc chucking device of an optical disc drive of the present invention having the structured described herein above is capable of keeping the chucking pulley above the pulley support member using the second magnetic attraction means in unloading state of an optical disc, the optical disc will not receive interference from the chucking pulley when the disc tray loads the optical disc. Because the chucking pulley can be drawn down strongly toward the pulley support member by the first magnetic attraction means when the disc table is lifted from the lower position to the upper position after loading of the optical disc, the optical disc can be chucked strongly on the disc table by the chucking pulley. On the other hand, because the chucking pulley can be kept above the pulley support member when the optical disc is unloaded, the clearance to be secured in unloading between the chucking pulley and the optical disc is reduced to a clearance L8 which is sufficiently smaller than L1+L2 in the previously applied invention. Because the pulley support member is structured with the centering guide which supports the center of the chucking pulley, the top surface of the optical disc is prevented from being scratched due to contact with the centering guide even if the optical disc is lifted far apart from the disc tray when the optical disc is loaded and unloaded in the case that the optical disc drive is placed vertically for use.
- FIG. 1 is an enlarged partial cross sectional side view in unloading operation for illustrating the first embodiment of a disc chucking device of an optical disc drive in accordance with the present invention.
- FIG. 2 is an enlarged partial cross sectional view in disc chucking operation of the disc chucking device shown in FIG. 1.
- FIG. 3 is a partially cut away plan view of a chucking pulley of the disc chucking device shown in FIG. 1.
- FIG. 4 is a cross sectional side view in unloading operation of the whole optical disc drive shown in FIG. 1.
- FIG. 5 is a cross sectional side view in disc chucking operation of the whole optical disc drive shown in FIG. 1.
- FIG. 6 is an enlarged partial cross sectional side view in unloading operation for illustrating the second embodiment of a disc chucking device of an optical disc drive in accordance with the present invention.
- FIG. 7 is an enlarged partial cross sectional view in disc chucking operation of the disc chucking device shown in FIG. 6.
- FIG. 8 is a cross sectional side view for illustrating the third embodiment of a disc chucking device of an optical disc drive in accordance with the present invention.
- FIG. 9A and FIG. 9B are cross sectional views for illustrating the fourth embodiment of a disc chucking device of an optical disc drive in accordance with the present invention.
- FIG. 10A and FIG. 10B are cross sectional views for illustrating the fifth embodiment of a disc chucking device of an optical disc drive in accordance with the present invention.
- FIG. 11 is a partially cut away plan view for illustrating an optical disc drive in accordance with the previously applied invention.
- FIG. 12 is an exploded perspective view for illustrating a chucking pulley, clamp support plate, disc tray, and disc table of the optical disc drive in accordance with the previously applied invention.
- FIG. 13 is an exploded perspective view for illustrating a head moving mechanism and a lift frame of the optical disc drive in accordance with the previously applied invention.
- FIG. 14 is an exploded perspective view for illustrating a loading mechanism and a chassis of the optical disc drive in accordance with the previously applied invention.
- FIG. 15 is a cross sectional side view in unloading operation of the optical disc drive in accordance with the previously applied invention.
- FIG. 16 is a cross sectional side view in disc chucking operation of the optical disc drive in accordance with the previously applied invention.
- FIG. 17 is a perspective view in unloading operation of the whole optical disc drive in accordance with the previously applied invention.
- FIG. 18 is a perspective view in loading operation of the whole optical disc drive in accordance with the previously applied invention.
- Embodiments of a disc chucking device of an optical disc drive in accordance with the present invention will be described in detail hereinafter with reference to FIGS.1 to 7. The same components as shown in FIGS. 11 to 18 are given the same characters as shown in FIGS. 11 to 18, and duplicated description is omitted.
- A disc chucking device of the first-embodiment of the present invention will be described with reference to FIGS.1 to 5.
- In detail, the
disc chucking device 161 is provided with the first magnetic attraction means 67 for drawing down a chuckingpulley 163 in the direction of the arrow b2 with a strong magnetic attraction force in the direction of the arrow b2 to the space beneath thepulley support member 162, and the second magnetic attraction means 72 for drawing up the chuckingpulley 163 with a weak magnetic attraction force in the direction of the arrow b1 to the space above thepulley support member 162. - The first magnetic attraction means67 comprises the
first magnet 68 and thefirst yoke 69 formed in the ring shape having the same diameter, thefirst yoke 69 is placed horizontally on the top surface of thefirst magnet 68 in close contact, and thefirst magnet 68 and the first yoke 169 which are in close contact are embedded horizontally and co-axially on the periphery of the center P2 at thecenter portion 163 b of the chuckingpulley 163. The second magnetic attraction means 71 is composed of the disc-shapedsecond magnet 72 having a smaller diameter than that of thefirst magnet 68, thesecond magnet 72 is embedded horizontally at the center P2 of thecentral portion 163 b of the chuckingpulley 163 at the level higher than thefirst yoke 69. - The magnetic attraction, namely the magnetic force, of the
first magnet 68 is strengthened by magnetizing thefirst magnet 68 to have S namely the S pole and N namely the N pole on both ends of thefirst magnet 68 in the diametrical direction f. On the other hand, the magnetic attraction force of thesecond magnet 72 is structured so as to be weaker than the magnetic attraction force of thefirst magnet 68. A magnetic attraction target of the first magnetic attraction means 67 consists of metal magnetic material such as stainless steel, and this target is a disc table 40 disposed beneath the chuckingpulley 163. A magnetic attraction target of the second magnetic attraction means 71 consists of magnetic material such as metal plate, and thetop cover 26 fixed horizontally above the chuckingpulley 163 functions also as the magnetic attraction target. A conicaltrapezoid center pit 163 c having a larger diameter than that of the center ring guide 40 a of the disc table 40 is formed on the bottom side of the center portion 63 b of the chuckingpulley 163, acenter pin 163 d is formed combinedly downward vertically at the center P2 of thecenter pit 163 c, and acenter hole 40 b is formed at the center P2 of the center ring guide 40 a of the disc table 40. - The first embodiment of the
disc chucking device 161 of the present invention is structured as described herein above, as shown in FIG. 1 and FIG. 4, in unloading operation of theoptical disc 1, a magnetic attraction force F2 which is directed upward namely in the direction of the arrow b1 generated by a magnetic flux φ2 having a low magnetic flux density is generated between thesecond magnet 72 of the second magnetic attraction means 71 and thetop cover 26 consisting of magnetic material, and the weak magnetic attraction force F2 draws up the chuckingpulley 163 in the direction of the arrow b1 to the space above thesupport member 162. When, the chuckingpulley 163 has been lifted in the direction of the arrow b1 by a distance of clearance L3 from thepulley support member 162, and a clearance L4 is formed between the bottom surface of the chuckingpulley 163 and the top surface of theoptical disc 1 placed horizontally on thedisc tray 2. - Therefore, as shown in FIG. 1 and FIG. 4, in loading operation of the
optical disc 1, theoptical disc 1 is loaded horizontally from the direction of the arrow a1 in theoptical disc drive 5 by thedisc tray 2, when, theoptical disc 1 is loaded safely without any interference of the chuckingpulley 163 due to the existence of the clearance L4. After loading of theoptical disc 1, as shown in FIG. 2 and FIG. 5, when thespindle motor 39 and the disc table 40 are lifted together in the direction of the arrow c1 from the lower position to the upper position and come up to the horizontal position, the center ring guide 40 a of the disc table 40 is engaged into thecenter hole 1 a of theoptical disc 1 supportingly, theoptical disc 1 is moved apart by the clearance L5 in the direction of the arrow b1 in thepit 3 of thedisc tray 2 by the disc table 40, thecenter hole 40 b of the center ring guide 40 a is engaged to thecenter pin 163 d of the chuckingpulley 163 from the direction of the arrow b1. - When, the center ring guide40 a of the disc table 40 consisting of magnetic material takes an access to the
first magnet 68 of the first magnetic attraction means 67, and a strong magnetic attraction force F1 generated by magnetic flux φ1 between thefirst magnet 68,first yoke 67, and the centeringguide 40 a is generated downward in the direction of the arrow b2. The magnetic attraction force F1 of the first magnetic attraction means 67 is a strong magnetic attraction force F1 which is stronger than the second magnetic attraction means 71, therefore, the chuckingpulley 163 is drawn down by the clearance L6 in the direction of the arrow b2 to the space beneath thepulley support member 162, thereby, theoptical disc 1 is chucked horizontally on the disc table 40 strongly and stably by the chuckingpulley 163. In this chucking state of theoptical disc 1, theflange 163 a of the chuckingpulley 163 is distant apart by the clearance L7 above thepulley pillow block 162 a of thepulley support member 162. - Because the
optical disc 1 is chucked strongly on the disc table 40 as described herein above, even when theoptical disc 1 is rotated at high speed by the disc table 40 of thespindle motor 39, theoptical disc 1 does not slip and is rotated stably at high speed, the information is high density recorded and/or reproduced precisely at high speed rotation in theoptical disc 1 such as DVD-ROM. - When the
optical disc 1 is unloaded after recording and/or reproducing, as shown in FIG. 1 and FIG. 4, the disc table 40 is lowered together with thespindle motor 39 from the upper position to the lower position in the direction of the arrow c2 by thelift frame 16, and the disc table 40 is moved apart from theoptical disc 1 in the direction of the arrow c2. When, the strong magnetic attraction force F1 generated in the direction of the arrow b2 between the chuckingpulley 163 and the disc table 40 by the first magnetic attraction means 67 is shut down, the chuckingpulley 63 is lifted again in the direction of the arrow b1 to the position distant apart from thepulley support member 162 by the distance of the clearance L3 by means of the weak magnetic attraction force F2 generated in the direction of the arrow b1 by means of the second magnetic attraction means 71, and the clearance L4 is formed again between the bottom surface of the chuckingpulley 163 and the top surface of theoptical disc 1 on thedisc tray 2. Therefore, when theoptical disc 1 is unloaded horizontally in the direction of the arrow a2 to the outside of theoptical disc drive 5 by thedisc tray 2, thereafter, theoptical disc 1 is unloaded safely without any interference of the chuckingpulley 163. - As described herein above, according to the
disc chucking device 161 of the present invention, as shown in FIG. 1 and FIG. 4 for description of unloading operation of theoptical disc 1, because the clearance L4 is formed between the bottom surface of the chuckingpulley 163 and the top surface of theoptical disc 1 in the state that the chuckingpulley 163 is kept drawn up by a distance of the clearance L3 in the direction of the arrow b1 to the position from the position of thepulley support member 62 by the weak magnetic attraction force F2 directed to the direction of the arrow b1 by the second magnetic attraction means 71, and as the result as shown in FIG. 1, the clearance L8 between the top surface of theoptical disc 1 which is placed horizontally in thepit 3 of thedisc tray 2 for loading and/or unloading and the bottom surface of the chuckingpulley 163 can be reduced in comparison with the clearance L1+L2 in the previously applied invention by the clearance L3, which is the drawn up distance of the chuckingpulley 163 from thepulley support member 162. Because the relation between clearances is represented by L8<L1+L2 in those structures as described herein above, the thickness T2 of the whole optical disc drive can be reduced by the clearance L3 in comparison with the thickness T1 in the previously applied invention. In other words, T2=T1−L3. Use of thetop cover 26 also as the magnetic member of the second magnetic attraction means 71 leads to the reduced cost due to reduction of the number of component parts and fabrication man-hour, and leads to the realization of the thinned optical apparatus as a whole. - According to the
disc chucking device 161 of the present invention, as shown in FIG. 2 and FIG. 5, after loading of theoptical disc 1, the first magnetic attraction means 67 which magnetically attracts the chuckingpulley 163 in the direction of the arrow b2 to the disc table 40 side comprises thefirst ring magnet 68 and thefirst ring yoke 69 which is in close contact horizontally with the top surface of thefirst magnet 68, and thefirst magnet 68 is magnetized to have S namely S-pole and N namely N-pole on both ends of thefirst magnet 68 in the diametrical direction f, thereby, the strong magnetic attraction force is generated consistently with least leakage magnetic flux between thefirst magnet 68 and the centeringguide 40 a of the disc table 40. Therefore, the magnetic attraction force F1 of the first magnetic attraction means 67 is served as a strong magnetic attraction force which is stronger consistently than the magnetic attraction force F2 of the second magnetic attraction means 71, the strong magnetic attraction force F1 draws down strongly the chuckingpulley 163 in the direction of the arrow b2, and as the result, theoptical disc 1 is chucked strongly and stably on the disc table 40 horizontally. - The first and
second magnets second magnets 58 and 72 are adjusted, thereby, the magnetic attraction forces F1 and F2 are adjusted simply and without any restriction, therefore, the chucking operation after loading of theoptical disc 1 and drawing up operation of the chuckingpulley 163 for unloading of theoptical disc 1 are performed consistently. - Next, the second embodiment of the disc chucking device of the present invention will be described with reference to FIG. 6 and FIG. 7.
- In detail, in the
disc chucking device 261 of the present invention, the centeringpin 74 which extends downward from thetop cover 26 forms the centering member, and the centering member forms the pulley support member. The top end of the centeringpin 74 is fixed to thetop cover 26, and the bottom end side of the centeringpin 74 which extends downward from thetop cover 26 is inserted into thecenter hole 75 formed at the center of the top surface of the chuckingpulley 263. Alarge diameter hole 76 is formed under thecenter hole 75 of the chuckingpulley 263, and a slip down preventingflange 77 is formed on the periphery of the bottom end of the centeringpin 74. The diameter of the centeringpin 74 relative to the diameter of thecenter hole 75, the diameter of thelarge hole 76 relative to the diameter of theflange 77, and the vertical depth of thelarge diameter hole 76 relative to the vertical thickness of theflange 77 are made large sized, thereby, the chuckingpulley 263 is supported by the centeringpin 74 movable as desired in the vertical and horizontal direction in a certain range. Thesecond magnet 72 having weak magnetic attraction is embedded co-axially on the periphery of thecenter hole 75 on the top surface of the chuckingpulley 263. - As described herein above, in the second embodiment of the disc chucking device of the present invention, the centering
pin 74 which is a component of the pulley support member supports the center of the chuckingpulley 263, therefore, in the case that theoptical disc drive 5 is placed vertically on a desk for use, when theoptical disc 1 is loaded and/or unloaded, theoptical disc 1 is lifted far apart upward (to chucking pulley side) from thedisc tray 2, as the result, possible contact of thetop surface 1 b of theoptical disc 1 with the chuckingpulley 263 will not cause contact of thetop surface 1 b of theoptical disc 1 with the centeringpin 74 which is fixed to thetop cover 26, and thus does not cause any scratching on the top surface. Possible contact of the top surface of theoptical disc 1 on the chuckingpulley 263 seldom causes scratching on the top surface of theoptical disc 1 because the chuckingpulley 263 is formed of synthetic resin and the chucking pulley can move in the vertical and horizontal direction upon contact. - According to the second embodiment of the disc chucking device of the present invention, even in the case that an
optical disc 1 such as DVD in which the information is recorded on both top and bottom sides is used, when theoptical disc 1 is loaded and/or unloaded thetop surface 1 b of theoptical disc 1 will not be scratched, not only on thebottom surface 1 c but also on thetop surface 1 b of theoptical disc 1, the information is recorded and/or reproduced highly precisely, and thus theoptical disc drive 5 excellent in performance and reliability is realized. - Further, when the
optical disc 1 is chucked as shown in FIG. 7, because of centering effect of the chuckingpulley 63 due to the centeringpin 74, thecenter pin 263 d of the chuckingpulley 263 is engaged into thecenter hole 40 a of the disc table 40 smoothly and consistently, and as the result centering of the chuckingpulley 63 to the disc table 40 is ensured. Therefore, the eccentric load due to deviation from the axis of the chucking pulley will not be generated, theoptical disc 1 is rotated stably, and the information is recorded and/or reproduced highly precisely. - Next, the third embodiment of the disc chucking device of the present invention will be described with reference to FIG. 8.
- In detail, in the
disc chucking device 361 of the present invention, the chuckingpulley 363 is formed of synthetic resin, and thecylindrical center portion 363 b having embedded first andsecond magnets first yoke 69, a disc-shapeddisc crimp plate 363 e formed horizontally on the periphery of the bottom end of thecenter portion 363 b, a cylindricalperipheral wall portion 363 f which rises upward from the periphery of thedisc crimp plate 363 e, and a disc-shaped flange having a small diameter provided inside theperipheral wall portion 363 f formed horizontally on the periphery of the top end of thecenter portion 363 b are formed combinedly with the chuckingpulley 363. - The
pulley support member 362 made of plate metal having a small diameter is attached on the bottom surface of thetop cover 26 made of plate metal, thepulley pillow block 362 a formed horizontally inside the bottom end of thepulley support member 362 is inserted in the inside of theperipheral wall portion 363 f of the chuckingpulley 363 to dispose it beneath theflange 363 a, thecenter portion 363 b of the chuckingpulley 363 a is engaged with allowance in the vertical and horizontal direction in thecircular hole 64 formed inside thepulley pillow block 362 a, and thepulley support member 62 supports the chuckingpulley 63 movable in the vertical and horizontal direction within a certain range. - According to the
disc chucking device 361 of the present invention, because the chuckingpulley 362 is supported by thepulley support member 62 inserted into the inside of theperipheral wall portion 363 f, in the case that theoptical disc drive 5 is placed vertically on a desk for using, when theoptical disc 1 is loaded and/or unloaded, theoptical disc 1 is lifted far apart to thepulley support member 362 side in thepit 3 of thedisc tray 2, and even if theoptical disc 1 happens to contact on thepulley support member 362 made of plate metal, theoptical disc 1 is prevented from being in contact directly with thepulley support member 362 by thedisc crimp plate 363 e and theperipheral wall portion 363 f which are formed combinedly with the checkingpulley 363 made of synthetic resin and cover the under side and periphery of thepulley support member 362. - The
optical disc 1 consists of synthetic resin, and if thepulley support member 362 is made of plate metal, and theoptical disc 1 happens to contact directly with thepulley support member 362 fixed at the prescribed position, then theoptical disc 1 is scratched strongly with the hardpulley support member 362 made of plate metal and the scratching causes easily a serious damage (large scratch is easily caused) on theoptical disc 1. - However on the other hand, in the disc chucking device of the present invention, because the under side and periphery of the
pulley support member 362 made of plate metal is covered by thedisc crimp plate 363 e and theperipheral wall portion 363 f of the chuckingpulley 363, direct contact of theoptical disc 1 with thepulley support member 362 and resultant serious damage on theoptical disc 1 is prevented, and high safety is secured. Because thepulley support member 362 has a small diameter and it is inserted in the inside of theperipheral wall portion 363 f of the chuckingpulley 363, as shown in FIG. 1 and FIG. 2, the space factor of the peripheral portion of the chuckingpulley 363 in the inside of theoptical disc drive 5 is improved, and the improved space factor is favorable for realizing a small-sized light-weightoptical disc drive 5. - The fourth embodiment of the disc chucking device of the present invention will be described with reference to FIG. 9.
- In the embodiment shown in FIG. 9, the
top cover 2 consisting of magnetic material is formed combinedly with theclamp support member 462 formed in the form of cylindrical recess, thecylindrical center shaft 101 formed combinedly on the upper center of thedisc clamp 463 is inserted through thecircular hole 64 formed at the center of the clamp support member from the bottom to the top, and thestopper ring 164 attached horizontally on the periphery of the top end of thecenter shaft 101 is disposed above theclamp support member 462. Theweak magnet 472 embedded in the form of ring on the top side of thedisc clamp 463 and theclamp support member 462 which is a component of the yoke constitute a means for pressing upward thedisc clamp 463 to the upper position, and thestrong magnet 468 is embedded in the form of ring on the bottom side of thedisc clamp 463. According to this embodiment, the weak magnetic attraction force exerted between theweak magnet 472 and theclamp support 462 lifts thedisc clamp 463 to the position where thedisc clamp 463 is brought into a contact with the bottom end of theclamp support member 462 when theoptical disc 1 is unloaded. - The
ring recess 168 is formed at the position which is facing to themagnet 472 on the bottom surface of theclamp support member 462 so that themagnet 472 is attracted to theclamp support member 462 with interposition of a space. - When the
optical disc 1 is chucked as shown in FIG. 9(B), the strong magnetic attraction force exerted between thestrong magnet 468 and the center ring guide 40 a of the disc table 40 attracts thedisc clamp 463 downward, and thedisc clamp 463 chucks strongly theoptical disc 1 on the disc table 40. - Also in the case of the disc clamp of this type, the
projection guide 114 is provided to the above-mentionedcover 115, therecess guide groove 121 is provided above thecramp support member 462, and positioning is performed by theguide 114 and theguide groove 121 similarly. - Next, the fifth embodiment of the disc clamp used in the present invention is shown in FIGS. 10A and 10B. In this embodiment, a ring-shaped
gap 167 is provided above the ring-shapedmagnet 568 embedded at the center of thedisc clamp 563, thereby, using onemagnet 568, thedisc clamp 563 is magnetically attracted upward in unloading operation, on the other hand, thedisc clamp 563 is magnetically attracted downward in chucking operation as shown in FIG. 10(B) and thedisc clamp 563 chucks theoptical disc 1 on the disc table 40, the same components as described in the embodiment shown in FIG. 9 are given the same characters, and the embodiment shown in FIGS. 10A and 10B exhibits the same operation and effects. - Embodiments of the present invention are described hereinbefore, however, the present invention is by no means limited to the above-mentioned embodiments, various modifications may be applied based on the technical spirit of the present invention. For example, the disc clamp may be pressed up using controllable electromagnetic force when the optical disc is unloaded.
Claims (13)
1. A disc drive comprising:
a disc tray for loading and ejecting a disc thereon;
a disc table that is lifted from the lower position to the upper position after loading of said disc, engaged upward in the center hole of said disc, and lifts said disc to the space above said disc tray; and
a disc clamp that is supported at the position upper than said disc, and chucks said disc on said disc table by being magnetically attracted to said disc table engaged in said center hole of said disc supportingly;
said disc clamp having:
pressing means for pressing upward to the position upper than that of the chucking position of said disc when said disc is unloaded; and
guide means for positioning said disc at the upper pressing position to the center rotation shaft of a spindle motor.
2. A disc drive as claimed in claim 1 , wherein said guide means has a projection guide portion formed on a fixing member positioned above the disc drive and a recess groove formed on the top surface of the disc clamp.
3. A disc drive as claimed in claim 1 , wherein said guide means has a recess groove formed on the fixing member positioned above the disc drive and a projection guide portion formed on the top surface of the disc clamp.
4. A disc drive as claimed in claim 2 , wherein said fixing member is a top plate of a disc drive container box.
5. A disc drive as claimed in claim 1 , wherein said disc drive has a projection guide portion positioned beneath said disc clamp for being engaged in the positioning hole formed at the center of said disc table when said disc is loaded.
6. A disc chucking device comprising:
a disc tray for loading and ejecting a disc thereon;
a disc table which comprises a magnetic material that is lifted from the lower position to the upper position after loading of said disc, engaged upward in the center hole of said disc, and lifts said disc above said disc tray;
a chucking pulley, being supported at the position upper than that of said disc by a pulley support member, being lifted to the space above the said pulley support member by said disc table engaged in the center hole of said disc supportingly, and chucking said disc on said disc table;
first magnetic attraction means for drawing down said chucking pulley to said disc table side when said disc table is lifted from said lower position to said upper position after loading of said disc; and
second magnetic attraction means for drawing up said chucking pulley from said pulley support member when said disc table is lowered from said upper position to said lower position to unload said disc.
7. A disc chucking device as claimed in claim 6 , wherein said pulley support member supports the center of said chucking pulley.
8. A disc chucking device as claimed in claim 6 , wherein said centering member has a centering pin which extends downward from a top cover consisting of magnetic material, and said centering pin is inserted loosely into the center hole formed at the center of said chucking pulley at least in the vertical direction.
9. A disc chucking device as claimed in claim 6 , wherein said disc chucking device is provided with a center pin extending downward from the center of the bottom surface of said chucking pulley, and a center hole formed at the center of the top surface of the centering guide of said disc table in which said center pin is inserted downward.
10. A disc chucking device comprising:
a disc tray for loading and unloading a disc thereon;
a disc table which comprises magnetic material that is lifted from the lower position to the upper position after loading of said disc to engage in the center hole of said disc supportingly and to lift said disc to the space above said disc tray;
a chucking pulley, being supported by a pulley support member at the position upper than that of said disc, being lifted to the space above said pulley support member by said disc table inserted in the center hole of said disc supportingly, and chucking said disc on said disc table;
first magnetic attraction means for drawing down said chucking pulley to said disc table side when said disc table is lifted from said lower position to said upper position after loading of said disc; and
second magnetic attraction means for drawing up said chucking pulley apart from said pulley support member when said disc table is lowered from said upper position to said lower position to unload said disc,
said first magnetic attraction means being provided with a first magnet fixed on said chucking pulley having a prescribed magnetic attraction force and a first yoke provided above said first magnet, and said second magnetic attraction means being provided with a second magnet having a magnetic attraction force smaller than that of said first magnet fixed above said first yoke of said chucking pulley and a magnetic member fixed at the position upper than said first magnet.
11. A disc chucking device as claimed in claim 10 , wherein:
said chucking pulley consists of synthetic resin, said first magnet and said first yoke are shaped in the form of approximately coaxial rings, said first magnet and said first yoke which is in close contact with said first magnet thereon are embedded horizontally at the center of said chucking pulley;
said first magnet is magnetized to have an S-pole and an N-pole on both ends of said first magnet in the diametrical direction; and
said second magnet shaped in the form of a disc having a diameter smaller than that of said first magnet is embedded horizontally at the center position of said chucking pulley at the position upper than that of said first yoke.
12. A disc chucking device of an optical disc drive as claimed in claim 10 , wherein said magnetic member fixed at the position upper than that of said second magnet is structured with said top cover made of a plate metal provided above said pulley support means.
13. A disc chucking device comprising:
a disc tray for loading and unloading a disc thereon;
a disc table which comprises a magnetic material that is lifted from the lower position to the upper position after loading of said disc to be engaged in the center hole of said disc supportingly and to lift said disc to the space above said disc tray; and
a chucking pulley, being supported by a pulley support member at the position upper than that of said disc, being lifted to the space above said pulley support member by said disc table inserted in the center hole of said disc supportingly, and chucking said disc on said disc table;
wherein:
the cylindrical center portion where a magnet is embedded, a disc-shaped disc pressing plate formed horizontally on the periphery of the bottom end of said center portion, a cylindrical peripheral wall portion which rises upward from the periphery of said disc pressing plate, and a disc-shaped flange formed horizontally on the outer periphery of the top end of said center portion and provided inside the peripheral wall portion are formed combinedly of synthetic resin; and
said pulley support member formed on the bottom surface of said top cover is inserted in the inside of peripheral wall portion of said chucking pulley to support said flange of said chucking pulley.
Applications Claiming Priority (12)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP09-323038 | 1997-11-25 | ||
JPP09-323038 | 1997-11-25 | ||
JP32303897A JPH11162062A (en) | 1997-11-25 | 1997-11-25 | Optical disk device |
JP34901597 | 1997-12-18 | ||
JP09-349015 | 1997-12-18 | ||
JPP09-349015 | 1997-12-18 | ||
JP00846798A JP3931415B2 (en) | 1997-12-18 | 1998-01-20 | Disk unit |
JP10-008467 | 1998-01-20 | ||
JPP10-008467 | 1998-01-20 | ||
JP3859998A JPH11238278A (en) | 1997-12-18 | 1998-02-20 | Disk chucking device for optical disk device |
JP10-038599 | 1998-02-20 | ||
JPP10-038599 | 1998-02-20 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20020009036A1 true US20020009036A1 (en) | 2002-01-24 |
US6438087B2 US6438087B2 (en) | 2002-08-20 |
Family
ID=27454950
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/196,509 Expired - Fee Related US6438087B2 (en) | 1997-11-25 | 1998-11-20 | Chucking device for disc drive |
Country Status (2)
Country | Link |
---|---|
US (1) | US6438087B2 (en) |
KR (1) | KR19990045581A (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030123376A1 (en) * | 2000-12-20 | 2003-07-03 | Akihisa Inatani | Disc chucking device and disk recording and/or reproducing apparatus |
US20040218482A1 (en) * | 2003-04-16 | 2004-11-04 | Funai Electric Co., Ltd. | Disk player |
US20050010942A1 (en) * | 2003-07-09 | 2005-01-13 | Samsung Electronics Co., Ltd. | Optical disc drive |
US6874155B2 (en) * | 2000-10-12 | 2005-03-29 | Funai Electric Co., Ltd. | Chucking apparatus of disk player |
US20050262523A1 (en) * | 2004-05-21 | 2005-11-24 | Funai Electric Co., Ltd. | Disk drive |
EP2101326A1 (en) * | 2008-03-11 | 2009-09-16 | Funai Electric Co., Ltd. | Disk device |
US20100251272A1 (en) * | 2009-03-25 | 2010-09-30 | Sony Corporation | Disc loading mechanism and disc drive apparatus |
US20110072446A1 (en) * | 2009-09-24 | 2011-03-24 | Nobuaki Onagi | Disk clamping mechanism and disk drive system |
CN103065650A (en) * | 2011-10-24 | 2013-04-24 | Lg伊诺特有限公司 | Disc clamping unit and spindle motor having same |
US20140223457A1 (en) * | 2013-02-05 | 2014-08-07 | Toshiba Samsung Storage Technology Korea Corporation | Optical disk drive including spindle unit and chucking structure |
CN109538097A (en) * | 2019-01-11 | 2019-03-29 | 江苏赛迪乐节能科技有限公司 | The anti-lower slip device of the venetian blind of shutter embedded in hollow glass |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TW472235B (en) * | 2000-09-22 | 2002-01-11 | Ind Tech Res Inst | CD loader |
KR100403590B1 (en) * | 2001-07-23 | 2003-10-30 | 삼성전자주식회사 | Disk changer |
KR100463431B1 (en) * | 2002-02-07 | 2004-12-23 | 삼성전기주식회사 | Clamp device for optical disk |
JP2004259424A (en) * | 2003-02-07 | 2004-09-16 | Shinano Kenshi Co Ltd | Optical disk device |
JP2005018951A (en) * | 2003-06-30 | 2005-01-20 | Orion Denki Kk | Clamp mechanism of disk unit |
JP4122303B2 (en) * | 2004-02-17 | 2008-07-23 | オリオン電機株式会社 | Disk device with clamper on substrate |
JP2006202406A (en) * | 2005-01-20 | 2006-08-03 | Matsushita Electric Ind Co Ltd | Optical disk device and disk changer device |
JP4569643B2 (en) * | 2008-03-04 | 2010-10-27 | ソニー株式会社 | Disc recording and / or playback device |
US20110145845A1 (en) * | 2008-12-18 | 2011-06-16 | Panasonic Corporation | Disk device |
CN102945680B (en) * | 2011-08-16 | 2016-01-20 | 飞利浦建兴数位科技股份有限公司 | CD-ROM drive |
US11756583B2 (en) * | 2021-09-03 | 2023-09-12 | Western Digital Technologies, Inc. | Removable disk clamp for read-write device in archival data storage library |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5814386A (en) * | 1981-07-20 | 1983-01-27 | Toshiba Corp | Digital disc player |
BE892073A (en) * | 1982-02-09 | 1982-05-27 | Staar Sa | DEVICE FOR HOLDING A MAGNETIC LOCK FOR A TURNTABLE |
JPS61240473A (en) * | 1985-04-18 | 1986-10-25 | Mitsubishi Electric Corp | Flexible magnetic disc device |
JPS63130948U (en) * | 1987-02-19 | 1988-08-26 | ||
NL8700819A (en) * | 1987-04-08 | 1988-11-01 | Philips Nv | DEVICE FOR RECORDING OR READING INFORMATION FROM AN INFORMATION PLATE. |
US5001700A (en) * | 1989-03-30 | 1991-03-19 | Literal Corporation | Disk clamp and centering apparatus for a beam addressable disk drive system |
DE4101693A1 (en) * | 1991-01-22 | 1992-07-23 | Nsm Ag | DISK PLAYER |
US5914929A (en) * | 1994-09-07 | 1999-06-22 | Sanyo Electric Co., Ltd. | Optical disk recording/playback device with means to recognize, read from and record to multiple types of optical disk types |
JPH09180330A (en) * | 1995-12-21 | 1997-07-11 | Akai Electric Co Ltd | Clamping mechanism |
-
1998
- 1998-11-20 US US09/196,509 patent/US6438087B2/en not_active Expired - Fee Related
- 1998-11-25 KR KR1019980050783A patent/KR19990045581A/en not_active Application Discontinuation
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US6874155B2 (en) * | 2000-10-12 | 2005-03-29 | Funai Electric Co., Ltd. | Chucking apparatus of disk player |
US6952834B2 (en) * | 2000-12-20 | 2005-10-04 | Sony Corporation | Disc chucking device and disk recording and/or reproducing apparatus |
US20030123376A1 (en) * | 2000-12-20 | 2003-07-03 | Akihisa Inatani | Disc chucking device and disk recording and/or reproducing apparatus |
US20040218482A1 (en) * | 2003-04-16 | 2004-11-04 | Funai Electric Co., Ltd. | Disk player |
US7392528B2 (en) * | 2003-04-16 | 2008-06-24 | Funai Electric Co., Ltd. | Clamper plate of a disk player |
US20050010942A1 (en) * | 2003-07-09 | 2005-01-13 | Samsung Electronics Co., Ltd. | Optical disc drive |
US7454765B2 (en) * | 2003-07-09 | 2008-11-18 | Samsung Electronics Co., Ltd. | Optical disc drive |
US20050262523A1 (en) * | 2004-05-21 | 2005-11-24 | Funai Electric Co., Ltd. | Disk drive |
US8060899B2 (en) | 2008-03-11 | 2011-11-15 | Funai Electric Co., Ltd. | Disk device |
EP2101326A1 (en) * | 2008-03-11 | 2009-09-16 | Funai Electric Co., Ltd. | Disk device |
US20090235293A1 (en) * | 2008-03-11 | 2009-09-17 | Funai Electric Co., Ltd. | Disk device |
US20100251272A1 (en) * | 2009-03-25 | 2010-09-30 | Sony Corporation | Disc loading mechanism and disc drive apparatus |
US8561092B2 (en) * | 2009-03-25 | 2013-10-15 | Sony Corporation | Disc loading mechanism and disc drive apparatus |
US20110072446A1 (en) * | 2009-09-24 | 2011-03-24 | Nobuaki Onagi | Disk clamping mechanism and disk drive system |
EP2302629A3 (en) * | 2009-09-24 | 2012-07-04 | Ricoh Company, Ltd. | Disk clamping mechanism and disk drive system |
US8549547B2 (en) | 2009-09-24 | 2013-10-01 | Ricoh Company, Ltd. | Disk clamping mechanism and disk drive system, with movably supported clamper |
CN103065650A (en) * | 2011-10-24 | 2013-04-24 | Lg伊诺特有限公司 | Disc clamping unit and spindle motor having same |
US20130104156A1 (en) * | 2011-10-24 | 2013-04-25 | Lg Innotek Co., Ltd. | Disc clamping unit and spindel motor having the same |
US8645982B2 (en) * | 2011-10-24 | 2014-02-04 | Lg Innotek Co., Ltd. | Disc clamping unit and spindle motor having the same |
US20140223457A1 (en) * | 2013-02-05 | 2014-08-07 | Toshiba Samsung Storage Technology Korea Corporation | Optical disk drive including spindle unit and chucking structure |
CN109538097A (en) * | 2019-01-11 | 2019-03-29 | 江苏赛迪乐节能科技有限公司 | The anti-lower slip device of the venetian blind of shutter embedded in hollow glass |
Also Published As
Publication number | Publication date |
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US6438087B2 (en) | 2002-08-20 |
KR19990045581A (en) | 1999-06-25 |
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