Source: http://www.google.com/patents/US4941140?dq=6078894
Timestamp: 2015-03-30 13:06:00
Document Index: 167917940

Matched Legal Cases: ['art 44', 'art 44', 'art 44', 'art 47', 'art 47', 'art 47', 'art 44', 'art 47']

Patent US4941140 - Optical disc player - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsAn optical disc player for playing optical discs includes a disc compartment for accommodating an optical disc, a disc holding mechanism for holding an optical disc accommodated in the disc compartment, a disc rotation drive mechanism for rotating the optical disc held by the disc holding mechanism,...http://www.google.com/patents/US4941140?utm_source=gb-gplus-sharePatent US4941140 - Optical disc playerAdvanced Patent SearchPublication numberUS4941140 APublication typeGrantApplication numberUS 07/306,900Publication dateJul 10, 1990Filing dateFeb 7, 1989Priority dateAug 25, 1986Fee statusPaidAlso published asUS4890276, US4914647Publication number07306900, 306900, US 4941140 A, US 4941140A, US-A-4941140, US4941140 A, US4941140AInventorsTakuro Ono, Noboru Aoyama, Kaoru MorinagaOriginal AssigneeKabushiki Kaisha ToshibaExport CitationBiBTeX, EndNote, RefManPatent Citations (4), Referenced by (23), Classifications (28), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetOptical disc player
US 4941140 AAbstract
1. A turntable elevation apparatus for an optical disc player, said optical disc player including a disc compartment in a main chassis for accommodating an optical disc case, the optical disc case including an optical disc rotatably disposed therein, the apparatus comprising:disc holding means for holding the optical disc accommodated in the disc compartment, said disc holding means including turntable means for removably supporting and rotating an optical disc and clamper means for holding the optical disc to said turntable means, said turntable means having a hold position when the optical disc is held between said clamper means and said turntable means and a release position when the optical disc is released by said clamper means and said turntable means; disc rotation drive means for rotating said turntable means, said disc rotation drive means including a turntable shaft fixed to said turntable means and a motor capable of rotating said turntable shaft, said turntable shaft being translatable along the axis of said turntable shaft to move said turntable means between said hold position and said release position; and elevator means for controllably elevating said turntable means from said release position to said hold position including a cam member rotatably supported on the main chassis including a gear and a rotary cam, a motor capable of engaging said gear for imparting a rotational movement to said cam member, and an elevation member rotatably supported by said main chassis at a rotation point, said elevation member having a first end in sliding engagement with said rotary cam and a second end in rotatable engagement with said turntable shaft, said elevation member rotating about said rotation point as said cam member rotates thus translating said turntable shaft along the axis of said turntable shaft to move said turntable means between said hold position and said release position. 2. An apparatus as recited in claim 1, further including a mode detection switch in mechanical communication with said cam member for outputting a release detection signal and a hold detection signal when said cam member is rotated to thus rotate said elevation member about said rotation point to place said turntable means in said release and said hold positions, respectively.
3. A turntable elevation apparatus as recited in claim 1, further including a rotor at the end of said turntable shaft distal of said turntable means, said second end of said elevation member being in rotatable engagement with said rotor.
This is a continuation of application Ser. No. 089,337, filed Aug. 25, 1987 now U.S. Pat. No. 4,914,647.
The compact disc (referred as CD hereafter), for example, conventionally used in a digital audio disc playback system is made from a transparent resin and has a diameter of approximately 12 cm and a thickness of approximately 1.2 mm. The CD has a thin metal film deposited on at least one disc surface, and pits or depressions are formed in the thin metal film. The pits of depressions produce light reflectivities that are different from the reflectivity of the non-pitted portions of the metal film and that correspond to 1 or 0 digitized data. The pits and the non-pitted portions are alternatively lined in a form of spiral or concentric pit train or track in the information storage area of the CD. When a signal is read out from a CD, the CD is rotated at a variable rotation speed between 200 and 500 rpm. An optical pickup incorporating a semiconductor laser or photoelectric transducing device traces the pit train or track of the rotating CD with constant linear velocity while moving radially from the center portions toward the outer portions
Generally, CD players have a precise machanical construction for playing back such a large quantity of information. Conventional CD players intended, for example, for home use and or portable outdoor use, however, do not possess sufficient mechanical durability to satisfy the demand for adequate operating flexibility and simplicity. For example, conventional CD players are provided with an optical pickup and a pickup actuator for moving the optical pickup radially in respect of a CD.
The pickup actuator is usually constructed in using a linear drive type motor comprised of a linear guide member, a moving member movable along the guide member and a stator member for driving the movable member. As is well known, in the linear motor the moving portion is controlled its movement by the stator portion in operating state of the motor. As a result, the position of the moving portion is controlled during the operating state of the motor. However, the moving member is free to move in the nonoperating state of the motor. Therefore, optical pickups or pickup actuators must be locked mechanically for not moving during a transportion and/or a carriage of CD players. Otherwise the optical pickups or pickup actuators bump into guide ends due to exterior forces given in the transportion and/or the carriage so that they are damaged easily.
To overcome the the problem of prior art and in accordance with the purpose of the invention, as embodied and broadly described herein, the optical disc player of the present invention comprises a disc compartment for accomodating an optical disc, a disc holding mechanism for holding the optical disc accomodated in the disc compartment, a disc rotation drive mechanism for rotating an optical disc held by the disc holding mechanism, an optical pickup device which is radially movable in respect to the optical disc rotated by the disc rotation drive mechanism for optically tracing the optical disc and a pickup locking mechanism which is responsive to the disc holding mechanism for locking the optical pickup device during a non-operation of the tracing operation.
Further a pair of positioning pins 32a and 32b are provided on main chassis 31 in correspondence to the rear ends of guide rails 28a and 28b, respectively. Positioning pins 32a and 32b correspond to recesses 24e and 24f formed on the rear part of the bottom wall 24d of disc-case 24 so that positioning pins 32a and 32b fit into recesses 24e and 24f when disc-case 24 is loaded in the right position of disc compartment 23. Disc-case 24 is positioned in its right plane position in disc compartment 23 by the engagements of recess 24e with positioning pin 32a and recess 24f with positioning pin 32b, respectively. While, disc-case 24 is supported in its right height position in disc compartment 23 by guide rails 28a, 28b and positioning pins 32a, 32b. Leaf springs 29a and 29b presses downwardly disc-case 24 so that disc-case 24 is held stably in its right position.
Disc rotating section 33b has a motor 36 for rotating turntable 34 through a turntable shaft 34b. Motor 36 is comprised of a stator 36a fixed to main chassis 31 and a rotor 36b. Rotor 36b is coupled to turntable shaft 34b. turntable shaft 34b is supported by main chassis 31 through a bearing 34c so that turntable shaft 34b is rotatable in the plane parallel to disc-case receiving chassis 22 and slidable along its axis. i.e., in the direction of arrows A and B. Rotor 36b is coupled to a turntable elavation mechanism 37. Turntable elavation mechanism 37 has an elavation lever 38 of which a rear end 38a engages with rotor 36b of motor 36. Elavation lever 38 is rockably supported to main chassis 31 through a pin 38b. A spring 38c is mounted between elavation lever 38 and pin 38b so that elavation lever 38 is biased in the clockwise direction in the drawings. A front end 38d of elavation lever 38 engages with a cam member 39 which is rotatably supported to main chassis 31.
Referring now to FIGS. 5(a) through 5(g), a disc ejection mechanism 43 will be described. Disc ejection mechanism 43 is provided at a left side of mechanism compartment 25 (upper part of the drawings FIGS. 5(a) through 5(g)). Disc ejection mechanism 43 has a ejection slider 44 which is slidably mounted on disc-case receiving chassis 22 along the direction of arrows C and D in the drawings. Ejection slider 44 is biased in the direction of arrow C by a spring 44a which is suspended between disc-case receiving chassis 22 and ejection slider 44. A front end 44b of ejection slider 44 corresponds to a projection 39d which is formed on the bottom of gear member 39a. Ejection slider 44 also has a switch operation projection 44c which extends perpendicularly from ejection slider 44. A slider position detection switch 45 is provided in mechanism compartment 25 in the neighbor of ejection slider 44 so that switch operation projection 44c turns ON slider position detection switch 45 when ejection slider 44 moves in the direction of arrow C. Ejection slider 44 formed an engaging part 44d on its rear end 44e.
Disc ejection mechanism 43 also has a first and second disc ejection levers 46 and second disc ejection lever 47. First and second disc ejection levers 46 and second disc ejection lever 47 are provided in a rear part of mechanism compartment 25 (right part of the drawings of FIGS. 5(a) through 5(g)). First disc ejection lever 46 is rockably mounted on main chassis 31 through a support pin 46a. A spring 46b is suspended between main chassis 31 and first disc ejection lever 46 so that first disc ejection lever 46 is biased in the anti-clockwise direction in the drawings. First disc ejection lever 46 is provided with an engaging pin 46c on its left end 46d. Engaging pin 46c corresponds to engaging part 44d of ejection slider 44 so that engaging pin 46c engages with engaging part 44d when first disc ejection lever 46 rotates in the anti-clockwise direction in accordance with the biasing force of spring 46b. Second disc ejection lever 47 is rockably mounted at its center portion to a right end 46e of first disc ejection lever 46. Second disc ejection lever 47 is mounted to right end 46e through a support pin 47a which extends upwardly into disc compartment 23 from right end 46e of first disc ejection lever 46. As a result, second disc ejection lever 47 is placed in disc compartment 23. Second disc ejection lever 47 is provided with a disc-case lifting member 47b on its right end 47c.
Referring now to FIGS. 6(a) to 6(c), disc-case lifting member 47b will be described. Disc-case lifting member 47b is formed a sloped part 47d which extends in the direction of arrow C in the drawings. A slope 47e of sloped part 47d corresponds to a bottom edge of a rear wall 24g of disc-case 24. Slope 47e engages with the bottom edge of rear wall 24g when disc-case lifting member 47b moves in the direction of arrow C so that the rear end of disc-case 24 is raised by sloped part 47d, as shown in FIG. 6(b).
Referring now to FIGS. 5(a) to 5(g), the operation of disc ejection mechanism 43 will be described. When a stop key or button (not shown) is operated by a user, motor 36 is stopped so that the playback operation ends. Simultaneously, cam drive motor 40 again is activated. Cam drive motor 40 drives gear member 39a through worm gear 40a and idler gear 41 so that gear member 39a rotates in the clockwise direction in the drawing. In accordance with the rotation of gear member 39a, rotary cam 39b rocks elavation lever 38 in the clockwise direction against spring 38c so that turntable 34 lowers in the direction of arrow B. As a result CD 27 is released from the clamped condition by turntable 34 and clamper 35. Further, projection 39d engages with engaging part 44d of ejection slider 44 in accordance with the rotation of gear member 39a so that ejection slider 44 slides in the direction of arrow D against spring 44a. Then, rear end 44e of ejection slider 44 engages with engaging pin 46c of first disc ejection lever 46 so that first disc ejection lever 46 rotates in the clockwise direction against spring 46b. In accordance with the rotation of first disc ejection lever 46, second disc ejection lever 47 moves in the direction of arrow C. Then, sloped part 47d of second disc ejection lever 47 engages with the bottom edge of rear wall 24g of disc-case 24 so that the rear part of disc-case 24 is raised against leaf springs 29a and 29b.
Linear drive type motor 51 is comprised of a moving coil 51a and a stator 51b. Moving coil 51a is coupled to 48, while stator 51b is fixed to main chassis 31. Moving coil 51a has a bobbin 51c and a coil 51d wound on bobbin 51c. Stator 51b has a center yoke 51e, a pair of side yokes 51f and 51g and a pair of magnets 51h and 51i. Magnets 51h and 51i are magnetized in their perpendicular directions center yoke 51e supports moving coil 51a so that moving coil 51a moves along center yoke 51e. Side yokes 51f and 51g are coupled their respective ends to the ends of center yoke 51e. Magnets 51h and 51i are fixed to the middle parts of side yokes 51f and 51g, respectively, so that magnets 51h and 51i correspond to center yoke 51e. Stator 51b applies two magnetic fluxes to moving coil 51a so that moving coil 51a moves along center yoke 51e when a drive current is applied to coil 51d.
Referring now to FIGS. 7, 8(a) and 8(b), a pickup lock mechanism 53 will be described. As shown in FIG. 7, optical pickup 48 is formed a first rack 48a in its one side. Pickup lock mechanism 53 is provided in the neighbor of optical pickup 48. Pickup lock mechanism 53 has a second rack 53a which corresponds to first rack 48a of optical pickup 48. Second rack 53a is rockably supported to main chassis 31 through a shaft 53b. Shaft 53b is coupled to a rock lever 63c through a pair of gears 53d and 53e. Gear 53d is fixed to shaft 53b while gear 53e is fixed to rock lever 53c. Rock lever 53c is rockably supported to main chassis 31 through a shaft 53f, as shown in FIGS. 8(a) and 8(b). The end of rock lever 53c is coupled to rotor 36b of motor 36.
Turntable 34 and rotor 36b are lowered when the playback operation of the playback deck for CDs is stopped as shown in FIG. 8(b). Rock lever 53c is rocked in the anti-clockwise direction in response to the downward movement of rotor 36b. Rock lever 53c rotates second rack 53a in the clockwise direction through gears 53e, 53d and shaft 53b so that second rack 53a engages with first rack 48a of optical pickup 48. As a result, optical pickup 48 is locked by pickup lock mechanism 53. Pickup lock mechanism 53 holds the lock of optical pickup 48 during the state in that turntable 34 is lowered. Turntable 34 is held in the lowered position in the non-operation state of the CD player so that optical pickup 48 is securely protected from damages in transportation or carriage of the player.
Turntable 34 and rotor 36b are raised in the direction of arrow A when the playback deck starts the playback operation of CDs. Rock lever 53c is rocked in the clockwise direction in response to the upward movement of rotor 36b. Rock lever 53c rotates second rack 53a in the anti-clockwise direction through gears 53e, 53d and shaft 53b so that second rack 53a disengages from first rack 48a of optical pickup 48. As a result, optical pickup 48 is unlocked from pickup lock mechanism 53. Optical pickup 48 is free to move for tracing CDs during the playback operation
Referring now to FIGS. 9, 10(a), 10(b) and 10(c), a disc-case lock mechanism 54 will be described. Disc-case lock mechanism 54 locks disc-case 24 in the disc compartment 23 during the playback operation of CDs so that disc-case 24 is secured in disc compartment 23. Disc-case lock mechanism 54 has a lock lever 54a which is rockably mounted to main chassis 31 in the left side of disc compartment 23. Lock lever 54a is formed a projection 54b which corresponds to a recess 24h formed on a left side wall 24i of disc-case 24 when disc-case 24 is loaded in disc compartment 23. A spring 54c is suspended between lock lever 54a and main chassis 31 so that lock lever 54a is biased in the clockwise direction in the drawing. As a result, projection 54b engages with recess 24h of disc-case 24 to lock disc-case 24 in disc compartment 23 when disc-case 24 is loaded in disc compartment 23. Disc-case lock mechanism 54 also has a lock detection switch 54d and a disc case detection switch 54e. Lock detection switch 54d is provided in the left side of disc compartment 23 in the neighbor of lock lever 54a. While disc-case detection switch 54e is provided in the rear part of disc compartment 23. Lock lever 54a is formed a switch operation member 54f which corresponds to lock detection switch 54d. Switch operation member 54f engages with recess 24h of disc-case 24 when disc-case 24 is loaded in disc compartment 23.
Referring now to FIGS. 10(a), 10(b), 10(c) and 11, the operation of disc-case lock mechanism 54 will be described. Lock lever 54a is rocked in the clockwise direction when disc-case 24 is unloaded from disc compartment 23. In the loading operation of disc-case 24, lock lever 54a also is rocked in the clockwise direction until disc-case 24 reaches to a prescribed position in disc compartment 23, as shown in FIG. 10(a). Switch operation member 54f of lock lever 64a engages with lock detection switch 54d so that lock detection switch 54d is turned ON. lock lever 54a is rocked in the anti-clockwise direction by left side wall 24i against spring 54c when left side wall 24i of disc-case 24 engages with projection 54b, as shown in FIG. 10(b). Switch operation member 54f is disengaged from lock detection switch 54d due to the anti-clockwise rotation of lock lever 54a so that lock detection switch 54d is turned OFF. Lock lever 54a is rocked in the clockwise direction projection 54b when disc-case 24 reaches in its right position in disc compartment 23 for playback operation, as shown in FIG. 10(c). As a result, projection 54b fits into recess 24h of disc-case 24. Switch operation member 54f again engages with lock detection switch 54d so that lock detection switch 54d is again turned ON. Simultaneously, disc-case detection switch 54e also is turned ON by the engagement of rear wall 24g of disc-case 24 with disc-case detection switch 54e.
Referring now to FIGS. 5(a) through 5(g), FIGS. 10(a) through 10(c) and FIG. 11, a loading operation of disc-case 24 will be described. When a user loads disc-case 24 in disc compartment 23 through disc loading slot 26a of front panel 26 disc-case 24 is guided by guide rails 28a 28b, support pins 30a, 30b, and positioning pins 32a, 32b in disc compartment 23 (see FIGS. 5(a), 5(b), 10(a), 10(b)). Disc-case 24 is pushed into disc compartment 23 by the user until it reaches its right position for playback operation (see FIGS. 5(c), 10(c)). Otherwise, disc-case 24 is automatically pulled into the right position by any suitable automatic loading mechanism (not shown). Left side wall 24i of disc-case 24 turns OFF lock detection switch 54d at the time T1, as shown in the Graph I of FIG. 11, when disc-case 24 reaches a prescribed position, as shown in FIG. 10(b). Then, rear wall 24g of disc-case 24 turns ON disc-case detection switch 54e at the time T2, as shown in the Graph II of FIG. 11. Lock detection switch 54d is again turned ON at the time T3, as shown in the Graph I of FIG. 11, when disc-case 24 reaches the right position for playback operation, as shown in FIG. 10(c). In response to the ON states of lock detection switch 54d and disc-case detection switch 54e, cam drive motor 40 is activated so that cam member 39 is rotated through worm gear 40a and idler gear 41. Then, front end 38d of elavation lever 38 follows rotary cam 39b of cam member 39 so that elavation lever 38 is rocked in the anti-clockwise direction by the biasing force of spring 38c (see FIGS. 3(a), 3(b)). Rear end 38a of elavation lever 38 pushes up rotor 36b of motor 36 in the direction of arrow A. Turntable 34 enters into disc-Case 24 through aperture 24b and engages with CD 27. As a result, turntable 34 clamps CD 27 with clamper 35, as described before.
Referring now to FIGS. 5(a) through 5(g), FIGS. 10(a) through 10(c) and FIG. 11, an ejecting operation of disc-case 24 will be described. When a user operates loads disc-case 24 in disc compartment 23 through disc loading slot 26a of front panel 26, disc-case 24 is guided by guide rails 28a, 28b, support pins 30a, 30b and positioning pins 32a, 32b in disc compartment 23 see FIGS. 5(a), 5(b), 10(a), 10(b)). Disc-case 24 is pushed into disc compartment 23 by the user until it reaches its right position for playback operation (see FIGS. 5(c), 10(c)). Otherwise, disc-case 24 is automatically pulled into the right position by any suitable automatic loading mechanism (not shown). Left side wall 24i of disc-case 24 turns OFF lock detection switch 54d at the time T1, as shown in the Graph I of FIG. 11, when disc-case 24 reaches a prescribed position, as shown in FIG. 10(b). Then, rear wall 24g of disc-case 24 turns ON disc-case detection switch 54e at the time T2, as shown in the Graph II of FIG. 11. Lock detection switch 54d is again turned ON at the time T3, as shown in the Graph I of FIG. 11, when disc-case 24 reaches the right position for playback operation, as shown in FIG. 10(c). In response to the ON states of lock detection switch 54d and disc-case detection switch 54e, cam drive motor 40 is activated so that cam member 39 is rotated through worm gear 40a and idler gear 41. Then, front end 38d of elavation lever 38 follows rotary cam 39b of cam member 39 so that elavation lever 38 is rocked in the anti-clockwise direction by the biasing force of spring 38c (see FIGS. 3(a), 3(b)). Rear end 38a of elavation lever 38 pushes up rotor 36b of motor 36 in the direction of arrow A. Turntable 34 enters into disc-case 24 through aperture 24b and engages with CD 27. As a result, turntable 34 clamps CD 27 with clamper 35, as described before.
It will be apparent to those skilled in the art that modifications and variatiOns can be made to the optical disc player of this invention. In particular, the invention is applicable to an optical disc player for unpacked discs as well as an optical disc player for discs packed in disc-cases. It also can be applicable to an optical disc player in which a clamper moves in respect to a turntable for clamping disc. It also can be used with disc-shaped information strorage media other than compact audio discs, fro example, with vido discs. The invention in its broader aspects is, therefore, not limited to the specific details and illustrated examples shown and described. Accordingly, departure can be made from such details without departing from the spirit of the general inventive concept.
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