JP4529927B2 - Pickup transfer device - Google Patents

Description

  The present invention relates to a pickup transport device for an optical disc apparatus for reproducing and recording an optical disc.

  CD-ROM drive device as a device for reproducing and recording on optical disk media such as MO, PD, CD, CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, ± RW, ± R, etc. There are types such as a PD drive device. In the present invention, the term “optical disk device” is used as a comprehensive expression.

  2. Description of the Related Art Conventionally, an optical disk device is sometimes mounted on a portable personal computer (hereinafter referred to as a PC) as the device becomes smaller and thinner. In recent years, it has been increasingly mounted on notebook-type PCs that are smaller and thinner.

  One of the factors is that the capacity of software used in computers is increased and that inexpensive CD-ROMs are used as media distributed from magazine media. Along with this, it is inevitable that an optical disk drive is mounted on a computer.

  An example of a conventional optical disc apparatus as described above (Patent Document 1) will be described. The structure of an optical disk drive having an overall height of 12.7 mm used for notebook and thin desktop PCs (including a display main body integrated type) will be described. Conventionally, the following two methods have been proposed.

  One method is that the user himself holds the optical disk, attaches the optical disk directly to the turntable which is a component of the pickup, and then pushes the tray including the turntable into the drive housing by his / her hand, This is a drawer method that enables playback and recording.

  As another method, when the optical disk is carried to the front of the apparatus, the optical disk is inserted into a slit provided in a cover called a front bezel provided on the front of the apparatus, and inserted into the apparatus to a predetermined position, There is a method called slot loading in which an optical disk is automatically sucked into the inside of the apparatus, that is, a turntable by a loading mechanism such as a roller provided inside the apparatus (for example, see Patent Document 1).

  In the market, the drawer type is overwhelmingly dominant and occupies most of the market. In this drawer method, a U-shaped flexible substrate is used as a method of electrically connecting the tray and the substrate for connecting the optical disk device and the PC.

  FIG. 11 is an exploded perspective view of a conventional drawer type pickup module. In FIG. 11, 101 is a tray on which an optical disk is rotatably mounted. Reference numeral 102 denotes a pickup that reads and writes data by irradiating an optical disk with a laser and reads the reflected light. Reference numeral 103 denotes a pickup 102 that supports the pickup 102. When the data is written and read, the pickup 102 is moved to the radius of the optical disk. Pickup module for transporting in the direction, 104 is a spindle motor for rotating the optical disk, 105 is a turntable for placing the optical disk, 106 is a motor as a driving power source when transporting the pickup 102, 107 is a front bezel, 108 is a rail connecting the tray 101 and a bottom cover 110 described later, 109 is a push mechanism for discharging the tray 101 when the optical disk is taken out from the housing, and 110 is a substrate of the tray 101 and the main board 113. The A bottom cover 111 to be held, an upper cover 111 that protects the drive from an upward load on the housing, and the like 112 are attached to the bottom cover 110 and are members for smoothly sliding the rail 108 and the tray 101. In this example, a rail guide 113 is a main board attached to the bottom cover 110, and 115 is an electrical connection between the main board 113 and the pickup module 103 for reading information recorded on an optical disk attached to the conveying means. A sub board 114 is a flexible board for electrically connecting the sub board 115 and the main board 113.

12 is an enlarged view of the pickup module of FIG. 11, and FIG. 13 is a rear view of the pickup module of FIG. 12 and 13, 115 is a base for mounting each component, 116 is a protective cover for protecting the pickup and the like, 117 is a motor flexible board for transmitting electric power to the motor 106, and 118 is engaged with the screw shaft 121. A rack for transporting the pickup 102, 119 is a main shaft for supporting the pickup 102, 120 is a sub-shaft for supporting the pickup 102, 121 is a horizontal shaft by engaging the rotational power of the motor 106 with the rack 118. A screw shaft 122 for conversion to power, 122 is attached to the motor 106, a pinion for transmitting power to the screw shaft 121, 123 is an intermediate gear for transmitting power, and 124 is attached to the screw shaft 121. Vignetting, a shaft gear for transmitting power of other similar motor 106. Reference numeral 125 denotes a laser flexible substrate for transmitting an electrical signal to the pickup 102. The power flow of the transport mechanism will be described in detail. The electric power transmitted to the motor 106 through the feed flexible board 126 becomes the rotational power of the motor 106, and the screw shaft 121 passes through the gear train of the pinion 122, the intermediate gear 123, and the shaft gear 124. Is transmitted to. The cylindrical surface of the screw shaft 121 is provided with a groove that meshes with a protrusion provided on the rack 118, and the pickup 102 is reciprocated in the radial direction of the optical disc by converting rotational power into power in the horizontal direction. I can do it.
Japanese translation of PCT publication No. 2002-511629

  At present, for example, a pickup conveying apparatus employed in a portable notebook computer, for example, has a total height of 12.7 mm. Recently, a thin and light notebook computer with an emphasis on portability has started to be adopted with a total height of 9.5 mm. In the future, further reduction in thickness and weight is expected due to the spread of notebook computers, and accordingly, it is considered that further reduction in thickness and weight is required for the pickup transport device. On the other hand, with the increase in the number of functions of the drive, the size of the optical base and the pickup module that supports and transports the optical base is increasing, and the area that can be allocated to the tray and the operating means inside the housing of the pickup transport device is It is decreasing.

  On the other hand, the miniaturization of the motor, which is the driving power source, is slightly improved by improvements in materials and design, but is currently offset by the increase in the size of the pickup.

  Further, in a conventional optical disk drive, a motor that is a driving power source of the pickup transport mechanism and components such as a speed reduction mechanism attached to the motor are arranged in a position corresponding to the lower part of the optical disk in the drive in parallel with the transport direction of the pickup. ing. In this part, the clearance between the optical disk and the motor is already very strict, and as mentioned above, it is very difficult to make the motor significantly smaller and thinner in the short term, and it is considered that the feasibility is poor. Therefore, when the total height of the drive is reduced to 9.5 mm or less, the motor that is the driving power source and the gear train that transmits the driving force from the motor are placed in the part corresponding to the lower part of the optical disk in the drive as in the conventional pickup module. Placement is considered virtually impossible.

  That is, in the conventional optical disk drive, components such as a motor that is a driving power source of the pickup transport mechanism and a speed reduction mechanism that accompanies the motor are arranged in a direction perpendicular to the main surface of the optical disk. For this reason, the thickness in the direction perpendicular to the main surface of the optical disk of the apparatus cannot be made smaller than the sum of the thickness related to the optical disk and the thickness related to the motor and the accompanying speed reduction mechanism.

  The present invention has been made to solve such a problem, and by arranging parts such as a motor that is a driving power source of a pickup transport mechanism and a speed reduction mechanism associated with the motor in an area outside the optical disk, It is an object of the present invention to provide a pick-up conveying device that can be made thinner than the above-mentioned device, specifically, an overall height of 9.5 mm or less.

  In order to solve the above-described problem, a pickup transport device according to the invention has a motor and a gear train disposed in a region other than the optical disk mounting position inside the device, and the motor is disposed obliquely with respect to the transport direction of the pickup. Also, since the screw shaft cannot be placed outside the optical disk, even when an offset in the height direction occurs between the position of the motor rotation shaft and the rotation shaft of the screw shaft, it is compared with the conventional technology. Thus, it becomes possible to configure the pickup transport device with a very thin overall height, and it is possible to provide a pickup transport device capable of configuring the pickup transport device with a thickness of 9.5 mm or less.

  As described above, according to the present invention, the motor and the gear train are arranged in a region other than the lower part of the optical disc inside the drive, the motor is arranged obliquely with respect to the pickup conveying direction, and the thickness of the motor and the gear train is the optical disc. It was arranged to be killed in the thickness direction. With this configuration, the thickness of the apparatus can be significantly reduced as compared with the conventional one, and specifically, an optical disk apparatus having a total height of 9.5 mm or less can be realized.

According to a first aspect of the present invention, there is provided a pick-up conveying device, a screw shaft for conveying a pick-up for reading and writing data to / from an optical disc in the radial direction of the optical disc by rotating, and a motor as a conveyance driving source for the pickup. And a gear train for transmitting a driving force from the motor to the screw shaft, the motor and the gear train are disposed outside a placement position range of the optical disc, and the pickup and the screw shaft are In the axial direction of the screw shaft, it is connected on the inner peripheral side of the optical disc with respect to the pickup, and the drive shaft of the motor is inclined so as to form an obtuse angle with respect to the screw shaft and is perpendicular to the main surface of the optical disc. In the direction of the optical disc than the axis of the screw shaft. Characterized in that located on the side. With this configuration, the thickness of the optical disc and the thickness of the motor and the gear train can be killed in the direction perpendicular to the main surface of the optical disc, and it is thinner in the direction perpendicular to the main surface of the optical disc than the conventional pickup module. can do. In addition, the projected area is reduced. This also has the effect of thinning the entire optical disc apparatus incorporating the pickup transport device.

  Hereinafter, the best mode for carrying out the present invention will be described more specifically with reference to the drawings. Since the description here is the best mode for carrying out the present invention, the present invention is not limited to this mode.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a perspective view of the entire pickup module including the pickup conveyance device of the first embodiment. FIG. 2 is a perspective view of the entire pickup module including the pickup conveyance device of FIG. FIG. 3 is an enlarged perspective view of a driving force transmission portion of the pickup conveyance device of the first embodiment. 1 to 3, reference numeral 1 denotes a base frame which is a part for mounting and instructing components of the pickup module, 2 is a protective cover for protecting the pickup 5, the laser flexible substrate 9 and the like from disturbances, and 3 is a rotating optical disk. 4 is a turntable which is a part of the spindle motor 3 and is a part on which the optical disk is placed, 5 is a pickup for reading / writing data to / from the optical disk, and 6 is a pickup 5 in the radial direction of the optical disk. , A main shaft for supporting the pickup 5, a sub-shaft for supporting the pickup 5, and a laser flexible for transmitting a signal of the pickup 5 to the electric board. The substrate 10 is spirally formed on the side of the straight rod And a screw shaft for transporting the pickup 5 to which the rack 11 is attached in the radial direction of the optical disc by meshing with a mountain portion provided in the rack 11, and 11 is the rack described above. 12 is a thrust spring for supporting the stress against the thrust force generated in the axial direction when the screw shaft 10 rotates while meshing with the rack 11, and 13 is for supporting the motor 6 and attaching it to the base frame 1. The motor bracket 14 is a motor flexible board for supplying electric power to the motor 6 and the Hall element 20.

  A worm gear 15 is attached to the motor 6 to transmit the rotational power of the motor 6 to the idle gear 16. A gear 17 is engaged with the shaft gear 18 attached to the idle gear 16 and the screw shaft 10 to screw the power of the motor 6. A train gear 19 for transmitting power to the shaft 10 is attached to the worm gear 15, and an encoder magnet for detecting the rotation of the worm gear 15 by being combined with the hall element 20, and 21 is a main shaft support for supporting the main shaft 7. It is a spring.

  In the present embodiment, the power of the motor 6 is first transmitted to the worm gear 15 that is attached to the rotating shaft of the motor 6 without idling. The idle gear 16 is a helical gear designed to properly mesh with the number of the worm gear 15 and the lead, and a helical gear portion 17b provided on the outer periphery of the train gear 17 for the rotational power of the worm gear 15. To communicate.

  A face gear portion 17a is formed on the upper portion of the train gear 17, and the shaft gear 18 attached without slipping with respect to the face gear portion 17a and the screw shaft 10 meshes, and the screw shaft 10 rotates. Become. As a result, the groove provided on the screw shaft 10 and the mountain-shaped protrusion provided on the rack 11 mesh with each other, and the pickup 5 to which the rack 11 is attached can be transported.

  In this mechanism, the worm gear 15 can rotate forward and backward with respect to the idle gear 16, and it is effective to increase the number of strips to 3 or more in order to increase the efficiency of meshing.

  The combination of the worm gear 15 and the idle gear 16 that is a helical gear serving as a worm gear wheel can be configured as a pair of screw gears (first screw gear and second screw gear). By setting the helix angle of the helical gear to 45 degrees, the rotational direction of the helical gear can be changed to a right angle direction, and the helical gear can be used in place of the worm gear 15 and the helical gear in the present embodiment. Can be applied to this mechanism.

(Embodiment 2)
FIG. 4 is an enlarged perspective view of a driving force transmission portion of the pickup conveyance device of the second embodiment. In FIG. 4, 22 is a pinion gear which is a helical gear fixed in a state where it does not idle with respect to the shaft of the motor, and 23 is a center in which the rotation centers are offset so that they are machined to accurately mesh with the pinion gear 22. An offset helical face gear 24 is a shaft gear which is a helical gear processed so as to mesh accurately with the helical face gear 23.

  In this mechanism, the power of the motor 6 is transmitted to the shaft gear 24 through the helical face gear 23, and the shaft gear 24 is attached to the screw shaft 10 without idling. 10 can be transmitted.

  Since the drive transmission after the screw shaft 10 is the same as that described in the first embodiment, it is omitted here.

  The helical gear 22, the helical face gear 23, and the helical gear 24 attached to the screw shaft 10 can each be a hypoid gear, so that a similar transmission mechanism can be configured. I will omit the explanation.

(Embodiment 3)
FIG. 5 is an enlarged perspective view of a driving force transmission portion of the pickup conveyance device according to the third embodiment. In FIG. 5, reference numeral 25 denotes a pinion gear which is a bevel gear (first bevel gear) fixed without being idled with respect to the shaft of the motor 6, and 26 is a large bevel gear (second bevel gear) meshing with the pinion gear 25. 27 is an intermediate gear which is a helical gear attached to the same gear shaft 28 as the bevel gear 26 without idling, 29 is a shaft gear attached to the screw shaft 10 without idling, and 30 is a screw shaft. A thrust spring 31 that generates an urging force in the opposite direction to the thrust load generated at 10 is attached to the base 1 with screws, and supports the main shaft 7, the gear shaft 28, and the screw shaft 10. This is a main shaft bracket molded from a resin with good slidability.

  In this mechanism, the power of the motor 6 is first transmitted to the pinion gear 25 which is a bevel gear attached to the shaft of the motor 6 so as not to idle. Since the pinion gear 25 meshes with the bevel gear 26 and is supported in a rotatable state with respect to the main shaft bracket 31, the rotation of the pinion gear 25 is allowed to idle on the gear shaft 28 and with respect to the bracket 31. Then, it is transmitted to the shaft gear 29 via the intermediate gear 27 that is mounted in a rotatable state, and is transmitted to the screw shaft 10 that is connected to the shaft gear 29 so as not to idle. Since the drive transmission after the screw shaft 10 is the same as that described in the first embodiment, it is omitted here.

(Embodiment 4)
FIG. 6 is an enlarged perspective view of a driving force transmission portion of the pickup conveyance device according to the fourth embodiment. In FIG. 6, 32 is a pinion gear which is a spur gear fixed without being idled with respect to the shaft of the motor 6, 33 is a conical conical gear machined into a shape meshing with the spur gear 32, and 34 is a screw shaft. A thrust spring 35 for generating a biasing force in the opposite direction to the thrust direction load generated at 10 is a main shaft bracket for holding the main shaft 7, the screw shaft 10, and the like.

  In this mechanism, the power of the motor 6 is first transmitted to a pinion gear 32 that is a spur gear attached to the shaft of the motor 6 so as not to idle. Next, it is engaged with the pinion gear 32 and transmitted to the screw shaft 10 connected to the conical gear 33 in a state where it does not idle. Since the drive transmission after the screw shaft 10 is the same as that described in the first embodiment, it is omitted here.

  As a feature of this mechanism, even if the rotation shaft of the conical gear 33, that is, the rotation shaft of the screw shaft 10 is not necessarily on the same plane as the rotation shaft of the pinion gear 32, the conical gear side is processed according to the offset amount of the rotation shaft. By doing so, it is possible to maintain an appropriate meshing, and it is possible to reduce the number of parts such as an intermediate gear and a shaft.

  From the above, the optical disk apparatus can be provided with a height of 9.5 mm or less by using the pickup conveying apparatus of Embodiments 1 to 4 for the optical disk apparatus.

(Embodiment 5)
FIG. 7 is an enlarged perspective view of a driving force transmission portion of the pickup conveyance device according to the fifth embodiment, and FIG. 8 is a cross-sectional view taken along line BB in FIG. 7 and 8, 36 is a pinion gear which is a spur gear fixed in a state where it does not idle with respect to the shaft of the motor 6, 37 is a conical conical gear machined into a shape meshing with the spur gear 36, 38 Is a thrust spring that generates an urging force in the opposite direction to the thrust direction load generated on the screw shaft 10, and 39 is a main shaft bracket that holds the main shaft 7, the screw shaft 10, and the like.

  In this mechanism, the power of the motor 6 is first transmitted to a pinion gear 36 which is a spur gear attached to the shaft of the motor 6 so as not to idle. Next, it is meshed with the pinion gear 36 and transmitted to the screw shaft 10 connected to the conical gear 37 without idling. Since the drive transmission after the screw shaft 10 is the same as that described in the first embodiment, it is omitted here.

  As a feature of this mechanism, even if the rotation axis of the conical gear 37, that is, the rotation axis of the screw shaft 10 is not necessarily coplanar with the rotation axis of the pinion gear 36, the conical gear side is processed according to the offset amount of the rotation shaft. By doing so, it is possible to maintain an appropriate meshing, and it is possible to reduce the number of parts such as an intermediate gear and a shaft.

  Further, the conical gear 37 is press-fitted into the screw shaft 10, and the meshing between the conical gear 37 and the pinion gear 36 can be appropriately adjusted by translating the position of the conical gear 37 on the screw shaft 10, so that vibration It is possible to achieve quietness due to prevention and ensure feeding accuracy.

  Furthermore, in the fifth embodiment, the tip 40a is inserted into and supported by a motor shaft support hole 39a provided in the main shaft bracket 39, rather than the portion of the motor shaft 40 to which the pinion gear 36 is attached. This is because the motor 6 employed in the fifth embodiment is a stepping motor and there is play in the motor shaft 40, so that noise is prevented by preventing vibration, feeding accuracy is ensured, and proper engagement between the conical gear 37 and the pinion gear 36 is maintained. This is because it is necessary to fix the axial position of the motor shaft tip 40a within a predetermined range.

  The motor 6 having this configuration described in the fifth embodiment is not limited to a stepping motor, but in the case of a DC motor, there is no need to apply the present invention because there is no play in the motor shaft 40 due to the magnetic force of the motor itself. . However, if the motor 6 is a DC motor as employed in the first to fourth embodiments, an encoder for ensuring feed accuracy is required, and the control is also closed control. As a result, the configuration becomes complicated and the total cost increases. The reason for using the stepping motor is that the open control makes the configuration simpler and the total cost is reduced, while ensuring the feeding accuracy.

  Furthermore, the diagrams showing the configuration of the rack 41 employed in the fifth embodiment and the method of attaching it to the turntable 42 are as shown in FIGS. 9 and 10 (FIG. 10 is a view of FIG. 9 viewed from the back side). Is). In a portion in contact with the end portion of the turntable 42, two rotation fulcrum protrusion portions 41a and 41b are provided on one side, and a screwing portion 41c is provided on the opposite side to each other. It is the structure which pinches | interposes a part.

  When attaching the rack 41 to the end of the turntable 42, first, the two rotation fulcrum protrusions 41a and 41b are respectively connected to the protrusions of the turntable 42 in a state where the rack 41 is inclined with respect to the end of the turntable 42. 42a and 42b, and then the rack 41 is rotated about the pivot fulcrum protrusions 41a and 41b of the rack 41, and the bosses 42d and 42e of the turntable 42 are inserted into the boss holes 41d and 41e of the rack 41, respectively. Then, the screwing portion 41 c is brought into contact with the contact portion 42 c of the turntable 42. In this state, the screw hole 41f of the rack 41 and the screw hole 42f of the turntable 42 are provided at the same position. Finally, screws (not shown) are attached to the screw holes 41f provided in the screwing portions 41c of the rack 41 and the screw holes 42f of the turntable 42, and the attachment of the rack 41 to the end of the turntable 42 is completed. By adopting such a simple configuration, only one screwing is required for attaching the rack 41 to the end of the turntable 42, so that the number of assembling steps is reduced and the assembling accuracy is improved.

  From the above, the optical disk apparatus can be provided with a height of 9.5 mm or less by using the pickup conveying apparatus of Embodiments 1 to 5 for the optical disk apparatus.

  In any of the first to fifth embodiments, the motor 6 is inclined by a predetermined angle with respect to the pickup conveying direction, and the drive shaft is perpendicular to the main surface of the optical disc with respect to the screw shaft 10. Are arranged so as to be displaced toward the optical disc side in various directions. The inclination angle of the pickup with respect to the conveying direction is greater than 0 degree and smaller than 90 degrees with respect to the conveying direction of the pickup 5 or the rotational axis direction of the screw shaft 10, and 90 degrees between the motor shaft of the motor 6 and the screw shaft 10. An angle greater than 180 degrees and less than 180 degrees is formed. With this configuration, the pickup unit is largely secured in the plane direction while realizing a reduction in thickness and size of the pickup transport device and the optical disc device, and the motor 6 can be disposed outside the optical disc placement position range.

  Further, the motor 6, the motor shaft 40 integrated with the motor 6, the pinion gear 36, the screw shaft 10, the conical gear 37, the thrust spring 38, the main shaft bracket 39, and the like configured in advance as integrated parts are attached to the base frame 1. You may comprise. This improves the assembly accuracy.

  The pickup transport device of the present invention can also be applied to uses such as an optical disc device that is required to be thin.

1 is a perspective view of the entire pickup module including the pickup conveyance device of Embodiment 1. FIG. The perspective view seen from the back side of the whole pickup module containing the pickup conveyance apparatus of FIG. FIG. 4 is an enlarged perspective view of a driving force transmission portion of the pickup conveyance device according to the first embodiment. FIG. 4 is an enlarged perspective view of a driving force transmission portion of the pickup conveyance device according to the second embodiment. FIG. 4 is an enlarged perspective view of a driving force transmission portion of the pickup conveyance device according to the third embodiment. FIG. 6 is an enlarged perspective view of a driving force transmission portion of the pickup conveyance device according to the fourth embodiment. FIG. 6 is an enlarged perspective view of a driving force transmission portion of the pickup conveyance device according to the fifth embodiment. Sectional drawing in the BB line in FIG. The figure which shows the structure of the rack employ | adopted in Embodiment 5, and the attachment method to a turntable The figure which looked at FIG. 9 from the back side An exploded perspective view of a conventional drawer type pickup module Enlarged view of the pickup module of FIG. The back view of the pickup module of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base frame 2 Protective cover 3 Spindle motor 4 Turntable 5 Pickup 6 Motor 7 Main shaft 8 Sub shaft 9 Laser flexible board 10 Screw shaft 11 Rack 12 Thrust spring 13 Motor bracket 14 Motor flexible board 15 Warm gear 16 Idle gear gear)
17 train gear 17a face gear portion 17b helical gear portion 18 shaft gear (spur gear)
19 Encoder magnet 20 Hall element 21 Main shaft support spring 22 Pinion gear (helical gear)
23 Helical face gear (Center offset helical face gear)
24 Shaft gear (helical gear)
25 Pinion gear 26 Large bevel gear (second bevel gear)
27 Intermediate gear 28 Gear shaft 29 Shaft gear 30 Thrust spring 31 Main shaft bracket 32 Pinion gear (spur gear)
33 Conical gear 34 Thrust spring 35 Main shaft bracket 36 Pinion gear (spur gear)
37 Conical gear 38 Thrust spring 39 Main shaft bracket 40 Motor shaft 41 Rack 42 Turntable

Claims (1)

A screw shaft that conveys in the radial direction of the optical disk by rotating a pickup that reads and writes data to and from the optical disk;
A motor that is a conveyance drive source of the pickup;
A gear train for transmitting a driving force from the motor to the screw shaft,
The motor and the gear train are disposed outside the mounting position range of the optical disc,
The pickup and the screw shaft are connected on the inner peripheral side of the optical disc with respect to the pickup in the axial direction of the screw shaft,
The drive shaft of the motor is inclined so as to form an obtuse angle with respect to the screw shaft , and is positioned closer to the optical disc than the shaft of the screw shaft in a direction perpendicular to the main surface of the optical disc. Pickup transfer device.

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