PATENT DOCUMENT

Publication Number: US-8650584-B2
Application Number: US-84190210-A
Country: US
Kind Code: B2

Title: Disc mounting in optical disc drives

Abstract:
The embodiments herein describe an apparatus and method for a reduced Z stack slot loading optical disc drive (ODD). In one embodiment a reduced Z stack height slot loading optical disc drive (ODD) is described. The reduced Z stack height ODD includes at least a hub/turntable arrangement having a hub portion and a turntable portion, the turntable portion arranged to support an optical disc secured thereto by way of the hub such that when a rotational motive force is applied to the hub/combination, the optical disc rotates about a hub/turntable axis of rotation, and a rotational motor adjacent to the hub/turntable arrangement, the rotational motor being arranged to provide the rotational motive force to the hub/turntable arrangement, the rotational motor being located in such a way that a rotational motor axis of rotation is translated in a direction perpendicular to the hub/turntable axis of rotation and wherein a Z height of the hub/turntable arrangement and a Z height of the rotational motor are not cumulative.

Claims:
What is claimed is: 
     
       1. A reduced stack height slot loading optical disc drive (ODD), the stack height defined in a direction substantially perpendicular to the optical disc, the ODD comprising:
 a hub/turntable arrangement having a hub portion and a turntable portion, the turntable portion arranged to support an optical disc secured thereto by way of the hub such that when a rotational motive force is applied to the hub/turntable arrangement, the optical disc rotates about a hub/turntable axis of rotation; and 
 a rotational motor adjacent to the hub/turntable arrangement, the rotational motor having a rotation axis being arranged to provide the rotational motive force to the hub/turntable arrangement, wherein a height of the hub/turntable arrangement and a height of the rotational motor are not concatenated, wherein
 the hub/turntable arrangement is coupled to the chassis of the ODD through a displacement mechanism such that the hub/turntable arrangement can be displaced to positions away from the chassis allowing for the insertion and chucking of optical discs. 
 
 
     
     
       2. The ODD as recited in  claim 1 , wherein the rotational motive force that is generated along the rotation axis of the rotational motor is translated in a direction that is substantially perpendicular to the hub/turntable axis of rotation. 
     
     
       3. The ODD as recited in  claim 1 , wherein an overall height of the optical disc drive is reduced by an amount equal to an nominal height of the rotational motor. 
     
     
       4. The ODD as recited in  claim 1 , wherein the displacement mechanism includes a spring drive force that raises and lowers the hub/turntable arrangement substantially linearly along the direction of the hub/turntable axis of rotation. 
     
     
       5. The ODD as recited in  claim 1 , wherein the rotational motor is coupled to the ODD chassis through a movable mechanism such that the rotational motor can move substantially linearly along the chassis in a direction that is perpendicular to the hub/turntable axis of rotation. 
     
     
       6. The ODD as recited in  claim 1 , wherein the displacement mechanism includes a pivoting structure that allows for the displacement of the hub/turntable arrangement in two dimensions along a plane that is substantially perpendicular to the bottom of the chassis. 
     
     
       7. The ODD as recited in  claim 1 , wherein the rotational motor is coupled to the ODD chassis in a fixed manner. 
     
     
       8. The ODD as recited in  claim 7 , wherein a portion of the periphery of the hub/turntable arrangement surface contacts a portion of the surface of the driving rim of the rotational motor creating a mating contact that restricts displacement of the hub/turntable substantially along the direction of hub/turntable rotational axis while the hub/turntable arrangement is rotating. 
     
     
       9. The ODD as recited in  claim 8 , wherein the mating contact is formed from the existence of a high coefficient of friction between the two surfaces such that the surfaces remain in contact during the rotation of the hub/turntable arrangement. 
     
     
       10. The ODD as recited in  claim 8 , wherein the mating contact is formed by male and female gear shaped contact surfaces. 
     
     
       11. The ODD as recited in  claim 1 , further comprising a belt that couples the rotational motor to the hub/turntable arrangement, wherein the flex of the belt provides the necessary drive force to displace the hub/turntable arrangement substantially linearly along the direction of the hub/turntable axis of rotation. 
     
     
       12. A method of mounting and rotating an optical disc on the hub/turntable arrangement of an optical disc drive (ODDS comprising the steps of:
 securing the optical disc to the hub/turntable arrangement; 
 operationally configuring the hub/turntable arrangement with a rotation motor that is adjacent to and does not share the same axis of rotation as the hub/turntable arrangement; and, 
 driving the rotation movement of the hub/turntable arrangement using the adjacent rotation motor, wherein securing the optical disc to the hub/turntable arrangement further comprises the steps of:
 displacing the hub/turntable arrangement in a substantially downward direction to provide a clear path of insertion of the optical disc, and 
 displacing the hub/turntable arrangement in a substantially upward direction such that the hub extends through a central hole of the optical disc, securing the optical disc to the turntable. 
 
 
     
     
       13. The method of  claim 12 , wherein the hub/turntable arrangement is displaced substantially linearly along the direction of the hub/turntable axis of rotation. 
     
     
       14. The method of  claim 12 , wherein the hub/turntable arrangement is displaced in a two dimensional direction through the pivoting motion of the hub/turntable arrangement. 
     
     
       15. The method of  claim 12 , wherein operationally configuring the hub/turntable arrangement with the rotation motor includes displacing the hub/turntable arrangement such that the driving rim of the rotational motor is in contact with a portion of the periphery of the hub/turntable arrangement. 
     
     
       16. The method of  claim 15 , wherein the hub/turntable arrangement is displaced substantially linearly along the direction of the hub/turntable arrangement axis of rotation. 
     
     
       17. The method of  claim 15 , wherein the hub/turntable is displaced in a two dimensional direction through the pivoting motion of the hub/turntable. 
     
     
       18. The method of  claim 15 , wherein operationally configuring the hub/turntable arrangement with the rotation motor further includes the step of displacing the rotational motor along the chassis such that the driving rim of the rotational motor is in contact with a portion of the periphery of the hub/turntable arrangement. 
     
     
       19. A drive for reading and writing data into and from an optical disc with a portable computer device, the drive comprising:
 a motor for rotating the optical disc; 
 a hub for supporting the optical disc; 
 a means for coupling the motor to the hub along a plane substantially parallel to the plane of the optical disc; and 
 a means for displacing the hub along a direction substantially perpendicular to the plane of the optical disc to allow the optical disc to be placed on the hub. 
 
     
     
       20. The drive of  claim 19 , wherein the means for coupling the motor to the hub comprise at least one selected from the group consisting of two high friction surfaces in motive contact with one another, a belt, and a gear.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application claims priority under 35 USC 119(e) to U.S. Provisional Patent Application No. 61/325,308, filed Apr. 17, 2010 and is incorporated herein by reference in its entirety for all purposes. 
    
    
     TECHNICAL FIELD 
     The described embodiments relate generally to optical disc drives (ODD) and more particularly to reducing an overall Z stack of a slot driven ODD. 
     BACKGROUND OF THE INVENTION 
     In many cases it is necessary to mount objects onto a turntable. For example, many electronic devices contain an optical disc drive (ODD) for the purpose of reading and writing optical discs. Especially in the design of portable computers and electronic devices, there is a high value placed on reduction of size and weight. In current practice the slot loading ODD contains a coaxial hub/turntable/rotation motor combination that moves substantially along the axis of rotation, the ‘z’ direction, during the process of chucking the optical disc on the hub and turntable. Initially the hub/turntable/rotation motor combination must be moved substantially along the z direction so as to not interfere with movement of the optical disc in the plane of insertion, which plane of insertion is perpendicular to the z direction. When the optical disc is inserted, the hub/turntable/rotation motor combination is driven substantially along z in the other direction, so that the chucking hub is forced into the center hole of the optical disc, and thereby the optical disc is secured to the hub/turntable/rotation motor combination. 
     Unfortunately, however, this motion in the z direction increases the overall height, also referred to as the Z stack height, of the ODD. This increase in Z stack height can limit any reduction in size or weight of the portable computer. 
     Therefore, what is desired is a reduced Z stack optical disc drive. 
     SUMMARY OF THE DESCRIBED EMBODIMENTS 
     In one embodiment a reduced Z stack height slot loading optical disc drive (ODD) is described. The reduced Z stack height ODD includes at least a hub/turntable arrangement having a hub portion and a turntable portion, the turntable portion arranged to support an optical disc secured thereto by way of the hub such that when a rotational motive force is applied to the hub/combination, the optical disc rotates about a hub/turntable axis of rotation. The ODD also includes at least a rotational motor adjacent to the hub/turntable arrangement, the rotational motor being arranged to provide the rotational motive force to the hub/turntable arrangement, the rotational motor being located in such a way that a rotational motor axis of rotation is translated in a direction perpendicular to the hub/turntable axis of rotation and wherein a Z height of the hub/turntable arrangement and a Z height of the rotational motor are not cumulative. 
     A method of mounting and rotating an optical disc on the hub/turntable arrangement of an ODD can be carried out by performing at least the following operations. Securing the optical disc to the hub/turntable arrangement, operationally configuring the hub/turntable arrangement with a rotation motor that is adjacent to and removed from an axis of rotation of the hub/turntable arrangement, and driving the rotation movement of the hub/turntable arrangement using the adjacent rotation motor. 
     A non-transitory computer readable medium for storing a computer program, the computer program executed by a processor for controlling the operation of an ODD includes at least computer code for detecting the presence of the optical disc being substantially centered around the center of the hub/turntable arrangement, computer code for generating a hub/turntable arrangement upward displacement signal in response to the presence of the optical disc being substantially centered around the center of the hub/turntable arrangement, computer code for sending the hub/turntable upward displacement signal to the hub/turntable control arrangement, computer code for detecting the presence of the optical disc being secured to the turntable, computer code for generating a hub/turntable arrangement downward displacement signal in response to the presence of the optical disc being secured to the turntable, and computer code for sending the hub/turntable arrangement downward displacement signal to the hub/turntable control arrangement. 
     Other aspects and advantages will become apparent from the following detailed description taken in conjunction with the accompanying drawings which illustrate, by way of example, the principles of the invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention and the advantages thereof may best be understood by reference to the following description taken in conjunction with the accompanying drawings. 
         FIG. 1  shows a plan view of a slot loading optical disc drive (ODD) assembly having hub/turntable combination with an adjacent rotation motor having an axis of rotation is displaced from the axis of rotation of hub/turntable combination. 
         FIG. 2  shows a cross section view of hub and turntable on which is mounted optical disc. 
         FIG. 3  shows a flowchart detailing a process in accordance with the described embodiments. 
         FIGS. 4-6  describe an embodiment in which both the turntable/hub combination and the rotation motor move with respect to the ODD chassis. 
         FIGS. 7-9  describe an embodiment in which the turntable/hub combination moves substantially in two dimensions and the rotation motor is fixed with respect to the ODD chassis. 
         FIGS. 10-12  describe an embodiment in which the turntable/hub combination moves substantially along the z axis while the turntable it linked to the fixed rotation motor via a belt. 
         FIG. 13 : The line designator for element  1304  has been replaced by an arrow, and the line designator for element  204  has been slightly displaced down. 
         FIG. 14 : Label  1304  and an arrow designator have been added in correspondence with  FIG. 13 . Original label  1304  has been replaced with label  204 . 
         FIG. 15 : Label  1304  and its designator line have been removed. Label  1304  and an arrow designator line have been added. Labels  202  and  204  and corresponding designator lines have been added. 
     
    
    
     DETAILED DESCRIPTION OF REPRESENTATIVE EMBODIMENTS 
     In the following description, numerous specific details are set forth to provide a thorough understanding of the concepts underlying the described embodiments. It will be apparent, however, to one skilled in the art that the described embodiments may be practiced without some or all of these specific details. In other instances, well known process steps have not been described in detail in order to avoid unnecessarily obscuring the underlying concepts. 
     Broadly speaking, the embodiments herein describe an apparatus and method for a reduced Z stack slot loading optical disc drive (ODD). The various embodiments describe a reduced Z stack optical disc drive having at least a dual axis combination of a hub assembly, a turntable, and a rotation motor where the movement of these elements can be arranged to chuck and un-chuck an optical disc and provide rotation of the secured optical disc in a reduced Z stack environment. The various processes described can be performed by a processor executing a computer program product stored in a memory device along the lines of a system memory, for example, that can take the form of a hard disc drive, semiconductor memory such as FLASH, and so on. The computer program product can be part of a system program such a firmware that can be periodically accessed and updated when necessary. 
     More specifically, a rotation motor can be removed from the Z stack of the hub assembly and translated to a position adjacent to the hub assembly perpendicular to an axis of rotation of the turntable. In the described embodiments, the rotation motor can impart a rotational motive force to the adjacent turntable in motive contact with the rotation motor. Since the rotation motor is removed from the Z stack of the hub assembly, the overall Z height of the optical disc drive can be reduced by at least an amount equal to the nominal Z height of the rotation motor (which can be on the order of about 2 mm). In order to receive an optical disc at a receiving slot of the optical disc drive, a clear path is provided for the insertion of the optical disc since the hub assembly is located downward (i.e., −z direction) in relation to the turntable. When the optical disc is substantially centered about a turntable central opening, the hub assembly moves upward (i.e., +z direction) in such a way as to engage (i.e., chuck) a central hole of the optical disc. Once the optical disc is securely chucked to the turntable, the rotational motor can impart a rotational motive force to the turntable. Since the rotational motor is not included in the Z stack of the hub assembly, the overall thickness of the slot loading ODD can be substantially reduced over conventional slot loading optical disc drives allowing for the design of slimmer and more portable computers and electronic devices. 
     These and other embodiments are discussed below with reference to  FIGS. 1-15 . However, those skilled in the art will readily appreciate that the detailed description given herein with respect to these figures is for explanatory purposes only and should not be construed as limiting. 
       FIG. 1  shows a plan view of slot loading optical disc drive (ODD) assembly  100  in accordance with the described embodiments. ODD assembly  100  can include at least chassis  101  used to enclose and support hub/turntable combination  102  and adjacent rotation motor  104  having axis of rotation  106  displaced from axis of rotation  108  of hub/turntable combination  102 . Also shown for context are optical disc  110 , optical pickup unit  112  arranged to read digital data optically encoded on optical disc  110 . Frame  114  can support optical pickup unit  112 , hub/turntable combination  102  and rotation motor  104 . Optical disc  110  can be inserted into ODD assembly  100  by way of a slot opening (not shown). Optical disc  110  can be secured (also referred to as chucked) to hub/turntable combination  102  as illustrated in  FIG. 2  showing a cross section view of a particular embodiment of hub/turntable combination  102  with hub  202  and turntable  204  on which optical disc  110  is secured by clamp  206 . Turntable  204  can rotate about shaft  208  and bushing (or bearing)  210  mounted on base  212 . Axis of rotation  106  of rotation motor  104  is translated in a direction perpendicular to axis of rotation  214  of the optical disc  110  (that coincides with axis of rotation of hub/turntable combination  202 / 204 ). Accordingly, height Z motor  required for rotation motor  104  and height Z hub/turntable  required for the hub/turntable combination  202 / 204  are not added together in contrast to a conventional hub/turntable/rotation motor combination where the rotation motor and hub/turntable are stacked one atop the other. Accordingly, the overall Z height of the conventional ODD is that of the Z stack heights of the coincidentally placed rotation motor and hub/turntable combination added together. However, by displacing axis of rotation  106  of rotation motor  104  from axis of rotation  212  of hub/turntable combination  202 / 204 , a substantial reduction in the overall Z height can be achieved. For example, the reduction in Z stack height from conventional ODD arrangements can be on the order of height Z motor  of rotation motor  104 . 
     Additional configurations of reduced Z stack optical disc drives are shown in the following figures. The reduced Z stack optical disc drives described rely upon a lateral translation of axes of rotation of a rotation motor and hub/turntable combination to reduce the overall Z stack height of the optical disc drive.  FIG. 3  shows a flowchart detailing process  300  for operating a reduced Z height optical disc drive in accordance with the described embodiments. Process  300  can be performed by creating a clear path for insertion of an optical disc at  302 . The clear path can be created by, for example, retracting a hub/clamp into a recess of the hub/turntable combination thereby removing any impediments to the insertion of the optical disc into the optical disc drive. Once inserted and properly placed on the turntable, at least a portion of the hub centers the optical disc by forcing the hub into a center hole of the optical disc. The centered optical disc is then chucked (i.e., secured) to the hub/turntable combination by way of, for example, clamps in cooperation with the hub at  304 . Once the optical disc is chucked, the optical disc/hub/turntable combination is arranged to rotate freely at  306 . At  308 , the optical disc/hub/turntable combination and a rotation motor each having axes of rotation laterally displaced from one another are placed in motive contact with each other. In one embodiment, the motive contact can take the form of a belt. In another embodiment the motive contact can take the form of surfaces having high coefficients of friction or gear like structures. Other forms of motive contact are described in some detail in the following figures. At  310 , the rotation motor applies a motive force to the optical disc/hub/turntable combination. More particularly, the motive force is applied to a portion of the turntable which then causes the hub and optical disc to move in accordance with the turntable. 
     Several further embodiments are disclosed below with regards to  FIGS. 4-15 . 
       FIGS. 4-6  describe an embodiment in which both turntable/hub combination  102  and the rotation motor  104  move with respect to the ODD chassis  101 . In  FIG. 4  hub/turntable combination  102  can move downward (−) in the z direction about distance “d” to clear a path to allow insertion of the optical disc  110  into ODD  100  by way of OD slot  402 . In  FIG. 5  hub/turntable combination  102  can move upward (+) in the z direction about distance “d” to force the hub  202  into the center hole  502  of the optical disc  110 . In  FIG. 6 , hub/turntable combination  102  can be arranged to freely rotate about axis of rotation  108  and rotation motor  104  can move about distance δ such that that driving rim  602  of rotation motor  104  is in contact with the turntable  204 . In this way, a motive force can be applied to directly to turntable  204  by way of driving rim  602 . 
       FIGS. 7-9  describe an embodiment in which turntable/hub combination  102  can be pivotally attached to chassis  101  by way of supports  702 . In this way, turntable/hub combination  102  can move in two dimensions with respect to ODD chassis  102  whereas rotation motor  104  can remain fixed with respect to the ODD chassis  101 . In  FIG. 7 , pivot supports  702  can be used to cause hub/turntable combination  102  to pivot in a downward direction and away from rotation motor  104  until hub/turntable combination  102  is located about distance Δ 0  from rotation motor  104  in order to clear a path for insertion of the optical disc  110  into the ODD  100  by way of OD slot  402 . In  FIG. 8 , hub/turntable combination  102  can pivot in an opposite direction than that shown in  FIG. 7  reducing the distance between hub/turntable combination  102  and rotation motor  104  by about distance Δ 1 . In this way, hub  202  is forced into the center hole  502  of optical disc  110 . In  FIG. 9 , hub/turntable combination  102  can further pivot about distance Δ 2  (it should be noted that Δ 0 ≈Δ 2 +Δ 1 ) with the now mounted optical disc  110  to a position that allows free rotation of optical disc/hub/turntable combination as well as brings turntable  204  into direct contact with driving rim  902  of rotation motor  104  which is fixed to chassis  101  of ODD  100 . 
     In  FIG. 10 , hub/turntable combination  102  moves in the downward direction to allow insertion of optical disc  110  into ODD  100  by way of OD slot  402 . Rotation motor  104  can be linked via belt  1002  to turntable  204 . In the described embodiment, belt  1002  can flex to accommodate the z axis motion of hub/turntable combination  102 . In  FIG. 11 , hub/turntable combination  102  can move in the upward direction to force hub  202  into the center hole  502  of optical disc  110 . In  FIG. 12  hub/turntable combination  102  moves with mounted optical disc  110  to a position which allows free rotation. At this point, rotation motor  104  applies a motive force to belt  1002  that is, in turn, transferred to turntable  204  causing the hub/turntable/optical disc combination to rotate in an appropriate manner. 
       FIGS. 13-15  describe an embodiment in which turntable/hub combination  102  moves substantially along the z axis while rotational motor  104  remains fixed with respect to the ODD chassis  101 . In  FIG. 13 , hub/turntable combination  102  can be moved in the downward z direction to allow insertion of the optical disc  110  into ODD  100  by way of OD slot  402 . Rotation motor  104  can be linked to turntable  204  via surface contact where such surfaces  1302  and  1304  can be arranged to function as, for example, gears or their equivalent in that surfaces  1302  and  1304  facilitate sliding motion in the z direction. In this way, as shown in  FIG. 14 , hub/turntable combination  102  can move in the upward z direction to force hub  202  into the center hole  502  of the optical disc  110 . In  FIG. 15 , hub/turntable combination  102  can move with the now mounted optical disc  110  to a position which allows free rotation. Moreover, surfaces  1302  and  1304  can be engaged in such a way that rotation motor  104  can impart a motive force directly to turntable  202  by way of the interaction between surfaces  1302  and  1304 . It should be noted that the motive force can be transferred from by contact between surfaces  1302  and  1304  formed from the existence of a high coefficient of friction between the two surfaces such that the surfaces remain in contact during the rotation of the hub/turntable arrangement. In other embodiments, the motive force can be transferred by male and female gear shaped contact surfaces. 
     The described embodiments can also be embodied as computer readable code on a computer readable medium for controlling manufacturing operations or as computer readable code on a computer readable medium. The computer readable medium is any data storage device that can store data which can thereafter be read by a computer system. Examples of the computer readable medium include read-only memory, random-access memory, CD-ROMs, DVDs, magnetic tape, and optical data storage devices. The computer readable medium can also be distributed over network-coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. 
     The various aspects, embodiments, implementations or features of the described embodiments can be used separately or in any combination. The foregoing description, for purposes of explanation, used specific nomenclature to provide a thorough understanding of the invention. However, it will be apparent to one skilled in the art that the specific details are not required in order to practice the invention. Thus, the foregoing descriptions of specific embodiments of the present invention are presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed. It will be apparent to one of ordinary skill in the art that many modifications and variations are possible in view of the above teachings. 
     The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated.

Metadata:
Filing Date: 20100722
Publication Date: 20140211
Grant Date: 20140211
Priority Date: 20100417
Inventors: WEHRENBERG PAUL J.
Assignee: APPLE INC
CPC Classifications: [{"code": "G11B17/051", "inventive": true, "first": false, "tree": "[]"}, {"code": "G11B17/0288", "inventive": true, "first": true, "tree": "[]"}, {"code": "G11B17/051", "inventive": true, "first": false, "tree": "[]"}, {"code": "G11B17/0288", "inventive": true, "first": true, "tree": "[]"}]
Family ID: 44789199