# Patent

## Title
Disk drive device with arm for disc conveyance

## Abstract

A disk drive device includes a housing having a slot through which a disk-shaped recording medium having a recording surface is inserted and ejected, a mount that is disposed in the housing and on which the recording medium inserted through the slot is mounted, and a conveying mechanism including an arm unit that extends and retracts along a plane substantially parallel to the recording surface of the recording medium to convey the recording medium between the slot and the mount while holding a peripheral portion of the recording medium and a restricting unit that restricts the movement of the arm unit.

## Background
CROSS REFERENCES TO RELATED APPLICATIONS
The present invention contains subject matter related to Japanese Patent Application JP 2005-121743 filed in the Japanese Patent Office on Apr. 19, 2005, the entire contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to disk drive devices for recording and/or reproducing signals on optical disks and, more particularly, to a slot-in disk drive device that can receive disks with different diameters and an electronic apparatus.
2. Description of the Related Art
In general, optical disks, such as compact disks (CD) and digital versatile disks (DVD), and magneto-optical (MO) disks, such as minidisks (MD), are commonly known and various kinds of disk drive devices compatible with these disks and disk cartridges have been suggested.
In one type of disk drive device, a lid or a door provided on a housing is opened so that a disk can be directly attached to a turntable that faces outside through the lid or the door. In another type of disk drive device, a disk is placed on a disk tray that is horizontally moved into or out of a housing and the disk is automatically mounted on a turntable disposed in the housing when the disk tray is pulled inward. In a still another type of disk drive, a disk is directly mounted on a turntable that is provided on a disk tray. However, in either type, a user performs an operation of opening/closing the lid or the door, moving the disk tray inward and outward, or mounting the disk on the turntable.
In comparison, a so-called slot-in disk drive device is known in which a disk is automatically mounted on a turntable when the disk is simply inserted through a slot that is provided in the front side of a housing. In this disk drive device, when a disk is inserted into the slot, a load operation of pulling the disk into the housing or an eject operation of ejecting the disk from the housing through the slot is performed by rotating a pair of guide rollers that face each other in the opposite directions while the disk is held between the guide rollers.
On the other hand, there are demands for smaller, thinner, and lighter mobile apparatuses, such as notebook personal computers, in which the disk drive devices are mounted, and accordingly there are demands for smaller, thinner, and lighter disk drive devices for use in such a mobile apparatus. In addition, recently, there have been higher demands for slot-in disk drive devices that provide good operational feel than for tray-type disk drive devices that have been mainly used in personal computers and the like.
However, in a typical slot-in disk drive device, the length of the pair of guide rollers is longer than the disk diameter, and therefore the width of the overall device is relatively large. In addition, since the disk is held between the pair of guide rollers, the thickness of the device is also large. Therefore, it is considerably difficult to provide a small, thin slot-in disk drive device.
The standard thickness of ultra-slim disk drive devices mounted in notebook personal computers and the like is 12.7 mm, and the thickness of the disk drive devices may be reduced to 9.5 mm, which is equivalent to the thickness of hard disk drive (HDD) units. In such a case, it is difficult to use the above-mentioned guide rollers because of the size thereof.
Accordingly, to satisfy the demands for small, thin slot-in disk drive devices, a slot-in disk drive device including a plurality of rotating arms disposed between a disk inserted through a slot and a base to which a turntable for receiving the disk is attached has been suggested in, for example, Japanese Unexamined Patent Application Publication No. 2002-117604 (see paragraphs [0018] to [0028] and FIG. 1). In this disk drive device, a load operation of pulling the disk into the housing through the slot and an eject operation of ejecting the disk from the housing through the slot are performed by rotating the rotating arms in a plane parallel to the disk.
SUMMARY OF THE INVENTION
However, in the above-mentioned disk drive device according to Japanese Unexamined Patent Application Publication No. 2002-117604, it is difficult to arbitrarily set a distance by which a plurality of kinds of disks are pushed out from the slot in the eject operation using the rotating arms.
This is because the two rotating arms are structured such that the ejection of, for example, a large-diameter disk with a diameter of 12 cm would be completed when the rotating arms reach HOME positions (standby positions) in the eject operation and the distance by which the large-diameter disk is pushed out is determined by the HOME positions of the two rotating arms. The distance by which the disk is pushed out is one of the items that customers wish to set arbitrarily, and is preferably not determined depending on the structure of the device.
In addition, the distance by which the disk is pushed out that is determined depending on the HOME positions of the two rotating arms is excessive for some low-friction disks and there is a risk that such a disk will jump out of the drive device and fall in the eject operation.
In light of the above-described situation, it is desirable to provide a disk drive device and an electronic apparatus that can adjust a distance by which a disk-shaped recording medium is pushed out from a slot.
According to an embodiment of the present invention, a disk drive device includes a housing having a slot through which a disk-shaped recording medium having a recording surface is inserted and ejected, a mount that is disposed in the housing and on which the recording medium inserted through the slot is mounted, and a conveying mechanism including an arm unit that extends and retracts along a plane substantially parallel to the recording surface of the recording medium to convey the recording medium between the slot and the mount while holding a peripheral portion of the recording medium and a restricting unit that restricts the movement of the arm unit.
Since the disk drive device includes the conveying mechanism that can restrict the movement of the arm unit, when, for example, the recording medium is ejected through the slot, the movement of the arm unit can be restricted so as to adjust (reduce) the pushing force applied to the recording medium by the arm unit. Accordingly, the distance by which the recording medium is pushed out from the slot can be adjusted. When, for example, the distance by which the recording medium is pushed out from the slot is set to substantially one-half of the diameter of the recording medium, the recording medium can be easily removed from the slot and the recording medium can be prevented from falling from the slot.
In the disk drive device according to the embodiment of the present invention, the conveying mechanism may further includes a stopper attached to the arm unit and a rotational-force-applying unit that includes an engaging portion that becomes engaged with the stopper when the arm unit retracts and that applies a rotational force for retracting the arm unit. Accordingly, when the arm unit retracts and the engaging portion becomes engaged with the stopper, the pushing force applied to the recording medium by the arm unit that is pushed by the engaging portion with the stopper interposed therebetween can be reduced. Thus, the distance by which the recording medium is pushed out from the slot can be adjusted.
In the disk drive device according to the embodiment of the present invention, a pushing force applied to the recording medium by the arm unit when the movement of the arm unit is restricted is preferably set to be smaller than a frictional force applied to the recording medium when the recording medium is ejected through the slot. Accordingly, when the movement of the arm unit is restricted, the recording medium that is being ejected can be held in the slot by the frictional force applied between the slot and the recording medium.
In the disk drive device according to the embodiment of the present invention, the rotating-force-applying unit may apply the rotational force to the arm unit such that the engagement between the stopper and the engaging portion is canceled when the recording medium is pulled out from the slot. In this case, when the recording medium is pulled out from the slot, the frictional force between the slot and the recording medium is eliminated and the engagement between the stopper and the engaging portion is canceled. Accordingly, the arm unit can return to, for example, a standby state without using a mechanism for cancelling the engagement.
In the disk drive device according to the embodiment of the present invention, the rotating-force-applying unit may further include an elastic body and a lever that is rotated by an urging force applied by the elastic body and on which a pin is provided as the engaging portion and the stopper may have a contact surface that faces and comes into contact with the pin in a rotational direction of the lever. In this case, the pin provided on the lever that is rotated by the urging force applied by the elastic body comes into contact with the contact surface of the stopper to restrict the movement of the arm unit when the arm unit retracts.
In the disk drive device according to the embodiment of the present invention, the stopper may have a lock portion that engages with the engaging portion to lock the engaging portion. In addition, the disk drive device may further include a detector that detects whether or not the recording medium is inserted into the slot; and a releasing mechanism that releases the engaging portion from the stopper when the detector detects that the recording medium is not inserted into the slot. In this case, the engaging portion can be locked by the lock portion when the arm unit retracts, and accordingly the movement of the arm unit can be reliably restricted at a desired position. In addition, when the detector detects that the recording medium is not in the slot, the engaging portion can be released from the stopper by the releasing mechanism and the arm unit can return to the standby state.
In the disk drive device according to the embodiment of the present invention, the rotating-force-applying unit may further include an elastic body and a lever that is rotated by an urging force applied by the elastic body and on which a pin is provided as the engaging portion and the lock portion of the stopper may be a recess into which the pin is fitted. Accordingly, since the lock portion of the stopper is a recess into which the pin is fitted, the movement of the arm unit can be restricted when the pin having a simple structure is fitted into the recess.
The disk drive device according to the embodiment of the present invention may be capable of receiving a first disk and a second disk as the recording medium, the first disk having a first diameter and the second disk having a second diameter that is different from the first diameter. Accordingly, the distance by which the first disk or the second disk is pushed out from the slot can be adjusted when the first disk or the second disk is ejected.
According to another embodiment of the present invention, an electronic apparatus includes a disk drive device and a control unit for controlling the operation of the disk drive device. The disk drive device includes a housing having a slot through which a disk-shaped recording medium having a recording surface is inserted and ejected, a mount that is disposed in the housing and on which the recording medium inserted through the slot is mounted, and a conveying mechanism including an arm unit that extends and retracts along a plane substantially parallel to the recording surface of the recording medium to convey the recording medium between the slot and the mount while holding a peripheral portion of the recording medium and a restricting unit that restricts the movement of the arm unit.
Since the disk drive device includes the conveying mechanism that can restrict the movement of the arm unit, when, for example, the recording medium is ejected through the slot, the movement of the arm unit can be restricted so as to adjust (reduce) the pushing force applied to the recording medium by the arm unit. Accordingly, the distance by which the recording medium is pushed out from the slot can be adjusted. When, for example, the distance by which the recording medium is pushed out from the slot is set to substantially one-half of the diameter of the recording medium, the recording medium can be easily removed from the slot and the recording medium can be prevented from falling from the slot. The control unit is, for example, a CPU that generates and transmits signals to at least the disk drive device on the basis of operation inputs from a user.
As described above, according to the embodiments of the present invention, the distance by which the recording medium is pushed out from the slot can be adjusted.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view illustrating a disk drive device according to an embodiment of the present invention;
FIG. 2 is a perspective view illustrating a top cover of the disk drive device viewed from the inside;
FIG. 3 is a plan view illustrating the structure of the disk drive device;
FIG. 4 is a perspective view illustrating a base unit of the disk drive device;
FIG. 5 is a plan view illustrating the disk drive device from which some components are removed;
FIG. 6 is a plan view illustrating the disk drive device from which some more components are removed;
FIG. 7 is a plan view illustrating the positional relationship between a drive lever and detection switches of the disk drive device;
FIG. 8A is a side view of the drive lever viewed from one side, FIG. 8B is a top plan view of the drive lever, FIG. 8C is a side view of the drive lever viewed from the other side, and FIG. 8D is a bottom plan view of the drive lever;
FIG. 9A is a plan view illustrating the structure of a cam lever and FIG. 9B is a side view illustrating the structure of the cam lever;
FIG. 10A is a bottom plan view of the drive lever in the load operation and FIG. 10B is a top plan view of the drive lever in the load operation;
FIG. 11A is a bottom plan view of the drive lever in the eject operation and FIG. 11B is a top plan view of the drive lever in the eject operation;
FIG. 12 is a side view illustrating the state in which the base unit is at a releasing position in the operation of the disk drive device;
FIG. 13 is a side view illustrating the state in which the base unit is at a chucking position in the operation of the disk drive device;
FIG. 14 is a side view illustrating the state in which the base unit is at an intermediate position in the operation of the disk drive device;
FIG. 15 is a plan view illustrating the state in which insertion of a large-diameter disk is started in the operation of the disk drive device;
FIG. 16 is a plan view illustrating the state in which the process of pulling the large-diameter disk inward is started in the operation of the disk drive device;
FIG. 17 is a plan view illustrating the state in which the large-diameter disk is being pulled inward in the operation of the disk drive device;
FIG. 18 is a plan view illustrating the state in which the large-diameter disk is positioned at the center in the operation of the disk drive device;
FIG. 19 is a plan view illustrating the state in which chucking of the large-diameter disk for recording and/or reproducing is completed (recording/reproducing is performed) in the operation of the disk drive device;
FIG. 20 is a plan view illustrating the state in which the large-diameter disk is being ejected in the operation of the disk drive device;
FIG. 21 is a plan view illustrating the state in which a contact pin is engaged with a stopper when the large-diameter disk is ejected in the operation of the disk drive device;
FIG. 22 is a plan view illustrating the state in which insertion of a small-diameter disk is started in the operation of the disk drive device;
FIG. 23 is a plan view illustrating the state in which a detection switch that detects the insertion of the small-diameter disk is pressed in the operation of the disk drive device;
FIG. 24 is a plan view illustrating the state in which the process of pulling the small-diameter disk inward is started in the operation of the disk drive device;
FIG. 25 is a plan view illustrating the state in which the small-diameter disk is being pulled inward in the operation of the disk drive device;
FIG. 26 is a plan view illustrating the state in which the small-diameter disk is positioned at the center and the eject operation is started in the disk drive device;
FIG. 27 is a plan view illustrating the state in which chucking of the small-diameter disk for recording and/or reproducing is completed in the operation of the disk drive device;
FIG. 28 is a plan view illustrating the state in which the small-diameter disk is being ejected in the operation of the disk drive device;
FIG. 29 is a plan view illustrating a disk drive device according to a second embodiment of the present invention;
FIG. 30 is a plan view illustrating the state in which a contact pin is engaged with a stopper when the large-diameter disk is ejected in the operation of the disk drive device shown in FIG. 29; and
FIG. 31 is a plan view illustrating the state in which the contact pin fitted to the stopper shown in FIG. 30 is released by a drive lever.



DESCRIPTION OF THE PREFERRED EMBODIMENTS
Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a perspective view illustrating a disk drive device according to an embodiment of the present invention. FIG. 2 is a perspective view illustrating a top cover of the disk drive device viewed from the inside. FIG. 3 is a plan view illustrating the structure of the disk drive device.
Referring to FIG. 1, the disk drive device 1 includes a housing 3 that functions as an outer shell. The housing 3 includes a substantially flat-box shaped bottom case 4 that functions as a lower housing section and a top cover 5 that covers an upper opening of the bottom case 4.
As shown in FIGS. 1 and 2, the top cover 5 is formed of a thin metal plate and includes a top plate 5a that covers the upper opening of the bottom case 4 and a pair of side plates 5b formed by bending side portions of the top plate 5a along the opposite sides of the bottom case 4. The top plate 5a has a substantially circular hole 6 at substantially the center thereof. An engaging projection 28a of a turntable 23a that engages with, for example, a center hole 2a formed in an optical disk 2 is exposed to the outside through the hole 6 when a chucking operation, which will be described below, is performed. In addition, the top plate 5a has a contact projection 7 that slightly projects toward the inside of the housing 3 along the periphery of the hole 6. The contact projection 7 comes into contact with a peripheral portion of the center hole 2a of the optical disk 2 when the optical disk 2 is placed on the turntable 23a. 
As shown in FIG. 2, the top plate 5a has a guide member 8 on an inner principal surface thereof. The guide member 8 guides an end portion of a first rotating arm 35 and an end portion of a second rotating arm 36, which will be described below, toward and away from each other while restriction the vertical positions thereof. The guide member 8 is formed of a substantially arc-shaped metal plate that extends between the side plates 5b along the top plate 5a, and is attached to the top plate 5a by spot welding or calking at a position near the front side. In addition, the guide member 8 has an attachment portion that is adjacent to the front side and a retaining portion 8a that is higher than the attachment portion and that is adjacent to the rear side. Accordingly, a guide groove 9 with which the end portion of the first rotating arm 35 and the end portion of the second rotating arm 36 are engaged is formed between the retaining portion 8a of the guide member 8 that is adjacent to the rear side and the top plate 5a. In addition, the top plate 5a has windows 10 for bringing the end portion of the first rotating arm 35 and the end portion of the second rotating arm 36 into engagement with the guide groove 9.
As shown in FIG. 3, the bottom case 4 is formed of an approximately flat-box shaped metal plate. The bottom case 4 has a substantially rectangular bottom plate and a wing portion 4a that extends outward at a position higher than the bottom plate on one side of the bottom case 4.
A circuit board on which electronic components, such as an IC chip, that form a drive control circuit (not shown) for controlling the operation of the disk drive device 1, a connector for providing electrical connections, and detection switches, which will be described below, for detecting various movements are arranged is attached to the bottom plate of the bottom case 4 with screws or the like. In addition, a chassis 11 is attached to the bottom plate of the bottom case 4 with screws. The chassis 11 is positioned above the circuit board so as to divide the inside of the bottom case 4 at substantially the same height as the height of the above-mentioned wing portion 4a. 
As shown in FIG. 1, the top cover 5 is attached to the bottom case 4 with screws 12. More specifically, as shown in FIG. 2, a plurality of through holes 13 for receiving the screws 12 shown in FIG. 1 are formed along the peripheral edge section of the top plate 5a. In addition, the side plates 5b have a plurality of guide tabs 14 that are bent inward at a substantially right angle. As shown in FIG. 3, the bottom case 4 has fixing tabs 15 that are bent inward at a substantially right angle on the peripheral edge thereof. The fixing tabs 15 have screw holes 16 that correspond to the through holes 13 formed in the top cover 5. In addition, a plurality of guide slits 17 for retaining the guide tabs 14 of the top cover 5 are formed in the opposite sides of the bottom case 4.
When the top cover 5 is attached to the bottom case 4, the top cover 5 is caused to slide in the front to rear direction while the guide tabs 14 on the top cover 5 are engaged with the guide slits 17 formed in the bottom case 4. Thus, the upper opening of the bottom case 4 is covered by the top plate 5a of the top cover 5. Then, the screws 12 are inserted through the through holes 13 in the top cover 5 and are attached to the screw holes 16 in the bottom case 4. Thus, the housing 3 shown in FIG. 1 is obtained.
After the assembly, label seals (not shown) are adhered the top plate 5a of the top cover 5 to block the above-mentioned hole 6 and the windows 10. Accordingly, dust can be prevented from entering the housing 3 and a laser leakage to the outside can be avoided.
As shown in FIG. 1, a substantially rectangular plate-shaped front panel 18 is attached at the front side of the housing 3. The front panel 18 has a slot 19 through which the optical disk 2 is horizontally inserted and ejected. The disk drive device 1 is capable of receiving both a large-diameter disk with a diameter of 12 cm and a small-diameter disk with a diameter of 8 cm. For example, a large-diameter disk can be inserted into or ejected from the housing 3 through the slot 19. In addition, the front panel 18 has a display element 20 that illuminates to indicate the state of access to the optical disk 2, an eject button 21 that is pressed when the optical disk 2 is to be ejected, and a curtain 32 that prevents dust from entering and holds the optical disk 2 with a frictional force when the optical disk 2 is ejected.
FIG. 4 is a perspective view illustrating a base unit included in the disk drive device 1.
As shown in FIGS. 3 and 4, the disk drive device 1 has a base unit 22 that forms a main body of the disk drive device 1 on the bottom plate of the bottom case 4.
The base unit 22 includes a disk mount 23 on which the optical disk 2 inserted into the housing 3 through the slot 19 is mounted; a disk-rotating mechanism 24 for rotating the optical disk 2 mounted on the disk mount 23; an optical pickup 25 for writing or reading signals on the optical disk 2 rotated by the disk-rotating mechanism 24; and a pickup-conveying mechanism 26 for conveying the optical pickup 25 in the radial direction of the optical disk 2. The base unit 22 has an ultra-slim structure in which the above-mentioned components are integrated on a base 27.
The base unit 22 is arranged on the bottom plate of the bottom case 4 at a position closer to the front side than the chassis 11 such that the disk mount 23 is placed at substantially the center of the bottom case 4. In addition, the base unit 22 can be moved vertically by a base-lifting mechanism 55, which will be described below, and is positioned lower than the optical disk 2 inserted into the housing 3 through the slot 19 in the initial state.
The base 27 is formed by punching out a metal plate in a predetermined shape and bending the peripheral portion thereof downward. A substantially semicircular table opening 27a through which the turntable 23a of the disk mount 23 faces upward and a substantially rectangular pickup opening 27b which continues from the table opening 27a and through which an objective lens 25a included in the optical pickup 25 faces upward is formed in the principal surface of the base 27. A decorative panel (not shown) having an opening corresponding to the openings 27a and 27b is attached to the top plate of the base 27.
As shown in FIG. 4, the base 27 includes a first support shaft 59 that projects on a side that faces a drive lever 52, which will be described below, at a position near the disk mount 23; a second support shaft 60 that projects on a side that faces a cam lever 56 shown in FIGS. 9A and 9B, which will be described below, at a position near the disk mount 23; a third support shaft 62 that projects on a side opposite to the side that faces the drive lever 52 at a position near the front side; and a fixing support portion 65 provided on a side opposite to the side surface that faces the cam lever 56 at a position near the front side.
The disk mount 23 has the turntable 23a that is rotated by the disk-rotating mechanism 24, and a chucking mechanism 28 for attaching the optical disk 2 to the turntable 23a is provided at the center of the turntable 23a. The chucking mechanism 28 includes an engaging projection 28a that engages with the center hole 2a of the optical disk 2 and a plurality of retaining lugs 28b for retaining the optical disk 2 at the periphery of the center hole 2a that engages with the engaging projection 28a. Thus, the chucking mechanism 28 retains the optical disk 2 on the turntable 23a. 
The disk-rotating mechanism 24 has a flat spindle motor 24a that causes the optical disk 2 to rotate together with the turntable 23a. The spindle motor 24a is attached to the bottom plate of the base 27 by means of screws with a supporting plate 24b disposed therebetween in such a manner that the turntable 23a placed on the spindle motor 24a slightly projects from the table opening 27a formed in the base 27.
The optical pickup 25 has an optical block that converges a light beam emitted from a semiconductor laser that functions as a light source with an objective lens 25a, irradiates a signal recording surface of the optical disk 2 with the converged light beam so that the light beam is reflected by the signal recording surface of the optical disk 2, and receives the thus reflected light with a photodetector including a light-receiving element or the like. Thus, the optical pickup 25 writes or reads signals on the optical disk 2.
The optical pickup 25 includes an objective-lens drive mechanism, such as a two-axis actuator for moving the objective lens 25a in the optical axis direction (focusing direction) and a direction perpendicular to recording tracks of the optical disk 2 (tracking direction). The optical pickup 25 performs drive control operations including a focus servo operation for positioning the focal point of the objective lens 25a on the signal-recording surface of the optical disk 2 and a tracking servo operation for causing the spot of the light beam converged by the objective lens 25a to trace the recording track by moving the objective lens 25a in the focusing direction and the tracking direction by the two-axis actuator on the basis of a detection signal obtained from the optical disk 2. The objective-lens drive mechanism may also include a three-axis actuator that not only performs the focusing control and the tracking control but also adjusts the inclination (skew) of the objective lens 25a with respect to the signal-recording surface of the optical disk 2 so that the light beam converged by the objective lens 25a can be incident on the signal-recording surface of the optical disk 2 at a right angle.
The pickup-conveying mechanism 26 includes a pickup base 29 on which the optical pickup 25 is mounted, a pair of guide shafts 30a and 30b that support the pickup base 29 such that the pick base 29 can slide in the radial direction of the optical disk 2, and a pickup-base drive mechanism 31 that moves the pickup base 29 supported by the guide shafts 30a and 30b in the radial direction of the optical disk 2.
The pickup base 29 includes a pair of guide tabs 32a and 32b having guide holes through which the guide shaft 30a extends and a guide tab 33 having a guide groove in which the guide shaft 30b is fitted. The guide tab 33 and the guide tabs 32a and 32b project from opposite sides of the pickup base 29. Thus, the pickup base 29 is slidably supported by the pair of guide shafts 30a and 30b. 
The guide shafts 30a and 30b are arranged parallel to the radial direction of the optical disk 2 on the bottom plate of the base 27 and guide the pickup base 29 from the inner periphery of the optical disk 2 to the outer periphery thereof while the pickup base 29 supports the optical pickup 25 that faces outside through the pickup opening 27b formed in the base 27.
The pickup-base drive mechanism 31 includes a drive motor 31a that is attached to the base 27 and converts the rotation of the drive motor 31a into a linear movement using a gear and a rack (not shown), thereby moving the pickup base 29 along the guide shafts 30a and 30b, that is, in the radial direction of the optical disk 2.
Referring to FIG. 3, the disk drive device 1 includes a disk-conveying mechanism 34 that conveys the optical disk 2 between a disk insertion/ejection position to which the optical disk 2 is inserted or ejected through the slot 19 and a disk mounting position at which the optical disk 2 is mounted on the turntable 23a of the disk mount 23.
The disk-conveying mechanism 34 includes an arm mechanism 135 that extends and retracts along a plane substantially parallel to the recording surface of the optical disk 2 to convey the optical disk 2 between the slot 19 and the disk mount 23 while holding the peripheral portion of the optical disk 2 and a restricting mechanism 120 that restricts the movement of the arm mechanism 135 as described below.
The arm mechanism 135 includes the first rotating arm 35 and the second rotating arm 36 that rotate so as to hold the optical disk 2 therebetween at the peripheral portion of the optical disk 2, a third rotating arm 46 that assists the insertion of the optical disk 2, and a fourth rotating arm 49 that assists the ejection of the optical disk 2.
The first rotating arm 35 and the second rotating arm 36 are made of long metal plates and are disposed on the left and right sides of the disk mount 23. Each of the first rotating arm 35 and the second rotating arm 36 has a base portion positioned closer to the rear side than the disk mount 23 and supported by a first support shaft 37 provided on the chassis 11 and an end portion positioned closer to the front side than the disk mount 23. The first rotating arm 35 and the second rotating arm 36 can rotate in the directions shown by the arrows a1, a2, b1, and b2 in FIG. 3 such that the end portions thereof move toward or away from each other along a plane substantially parallel to the recording surface of the optical disk 2 inserted through the slot 19.
In the initial state (HOME state) in which the optical disk 2 is not yet inserted into the slot 19, the first rotating arm 35 and the second rotating arm 36 are positioned such that the end portions thereof are separated from each other by a predetermined angle.
The angle between the end portions is set such that at least the distance L1 between flanges 138 and 140 is smaller than the diameter of the small-diameter disk, i.e., 8 cm, so that the small-diameter disk can be retained when the small-diameter disk is inserted into the slot 19. Preferably, the angle between the end portions is set such that the minimum distance L2 between a rotating roller 73a of a first front contact member 38 and a rotating roller 73c of a second front contact member 40 is smaller than the diameter of the small-diameter disk.
As shown in FIG. 3, the first front contact member 38 and the flange 138 that restricts the movement of the optical disk 2 in the height direction thereof are provided on the end portion of the first rotating arm 35. The first front contact member 38 has a pair of rotating rollers 73a and 73b arranged in the front-rear direction.
The first rotating arm 35 also has a first rear contact member 39 that projects downward at a position near the base portion of the first rotating arm 35 and that comes into contact with the outer peripheral portion of the optical disk 2 together with the first front contact member 38 when the optical disk 2 is positioned at the disk mounting position.
The first front contact member 38, the flange 138, and the first rear contact member 39 are made of resin that is softer than the optical disk 2.
As shown in FIG. 3, a torsion coil spring 71d is attached to the first rotating arm 35. The first rotating arm 35 and the second rotating arm 36 are urged toward each other by the torsion coil spring 71d due to a gear portion 71a of a rotating member 71 and an inner gear 94.
As shown in FIG. 3, the rotating member 71 has the gear portion 71a that extends over a predetermined section along the periphery of the rotating member 71, and the gear portion 71a meshes with the inner gear 94 disposed on the chassis 11. Accordingly, the rotating member 71 rotates in association with the rotation of the first rotating arm 35.
The second front contact member 40 that comes into contact with the outer peripheral portion of the optical disk 2 inserted through the slot 19 and the flange 140 that restricts the movement of the optical disk 2 in the height direction thereof are provided on the end portion of the second rotating arm 36. The second front contact member 40 has rotating rollers 73c and 73d. The second front contact member 40 and the flange 140 are made of resin that is softer than the optical disk 2.
The first rotating arm 35 and the second rotating arm 36 are disposed at asymmetric positions with respect to the turntable 23a of the disk mount 23, and the rotational centers of the first rotating arm 35 and the second rotating arm 36 are on the same point that is closer to the rear side than the disk mount 23 in a substantially central section. In addition, the end portions of the first rotating arm 35 and the second rotating arm 36 are slidably supported while being engaged with the guide groove 9 formed in the top plate 5a. 
The first rotating arm 35 and the second rotating arm 36 are rotated in the opposite directions by a link mechanism 41.
More specifically, the link mechanism 41 includes a first link arm 42 and a second link arm 43 that connect the first rotating arm 35 and the second rotating arm 36 to each other. The first link arm 42 and the second link arm 43 are made of long metal plates, and are connected to the base portion of the first rotating arm 35 and the base portion of the second rotating arm 36, respectively, at one longitudinal end thereof. In addition, the first link arm 42 and the second link arm 43 are connected to each other by a second support shaft 44 at the other longitudinal end, and accordingly a so-called pantograph structure is provided. The second support shaft 44 is engaged with a guide slit 45 that is positioned closer to the front side than the first support shaft 37 on the chassis 11 and that extends linearly in the insertion direction of the optical disk 2.
The first support shaft 37 has a first torsion coil spring 75 that urges the first rotating arm 35 and the second rotating arm 36 toward each other. The first torsion coil spring 75 is attached to the base portion of the first rotating arm 35 at one end and to the base portion of the second rotating arm 36 at the other end while the first support shaft 37 extends through the winding portion of the first torsion coil spring 75.
Accordingly, when the second support shaft 44 slides along the guide slit 45, the first rotating arm 35 and the second rotating arm 36 are rotated by the first link arm 42 and the second link arm 43 in the opposite directions. Thus, the end portion of the first rotating arm 35 and the end portion of the second rotating arm 36 are rotated toward or away from each other by the link mechanism 41.
The third rotating arm 46 rotates in a plane substantially parallel to the recording surface of the optical disk 2 inserted through the slot 19 in order to assist a load operation for pulling the optical disk 2 into the housing 3 through the slot 19.
The third rotating arm 46 is made of a long metal plate and is placed on the left or right of the turntable 23a of the disk mount 23 (on the left in FIG. 3) at a position closer to the front side than the second rotating arm 36. The third rotating arm 46 is rotatably supported by a support shaft 47 provided on the wing portion 4a such that the third rotating arm 46 can rotate in the directions shown by the arrows c1 and c2.
FIG. 5 is a plan view illustrating the disk drive device 1 from which some components are removed.
The third rotating arm 46 has a substantially L-shaped shaft hole 46a shown in FIG. 5 through which the support shaft 47 extends, a cam pin 46b that engages with a cam groove 80 formed in the top plate of the drive lever 52 shown in FIGS. 8A to 8D, and a third contact member 48 disposed at an end of the third rotating arm 46.
As shown in FIGS. 3 and 5, the third rotating arm 46 is urged by a torsion coil spring 79 disposed on the wing portion 4a. The torsion coil spring 79 is attached to a retaining pin 79a provided on the wing portion 4a at one end thereof and to a retaining pin 79b provided on the bottom surface of the third rotating arm 46 at the other end thereof.
The cam pin 46b moves in the cam groove 80 formed in the drive lever 52 shown in FIG. 5 in association with the sliding movement of the drive lever 52, and accordingly the third rotating arm 46 is rotated. The rotational center of the third rotating arm 46 can be changed depending on the position of the support shaft 47 in the shaft hole 46a. 
The third contact member 48 projects upward from the third rotating arm 46 at the end thereof so as to come into contact with the outer peripheral portion of the optical disk 2 that is inserted through the slot 19. The third contact member 48 is a rotating roller with a small diameter that is rotatably attached to a principal surface of the third rotating arm 46 that faces the top plate 5a, and is made of resin that is softer than the optical disk 2.
FIG. 6 is a plan view illustrating the disk drive device 1 from which some more components are removed. FIG. 7 is a plan view illustrating the positional relationship between the drive lever 52 and detection switches included in the disk drive device.
The arm mechanism 135 includes the drive lever 52 for driving the rotating arms 35, 36, 46, and 49, etc., in association with each other. The drive lever 52 is made of a substantially prismatic resin body and is disposed between one side of the bottom case 4 and the base unit 22 on the bottom plate of the bottom case 4. In addition, the drive lever 52 is positioned below the optical disk 2 inserted into the housing 3 through the slot 19, and the top surface of the drive lever 52 is at substantially the same height as the bottom surface of the wing portion 4a. 
FIG. 8A is a side view of the drive lever 52 viewed from one side, FIG. 8B is a top plan view of the drive lever 52, FIG. 8C is a side view of the drive lever 52 viewed from the other side, and FIG. 8D is a bottom plan view of the drive lever 52.
As shown in FIG. 8C, the drive lever 52 has a first cam slit 95 for moving the base unit 22 vertically in the side that faces the base 27. The first cam slit 95 includes a first horizontal portion 95a for positioning the base 27 at the releasing position, a top portion 95b for positioning the base 27 at the chucking position, and a second horizontal portion 95c for positioning the base 27 at an intermediate position. As shown in FIG. 8D, the drive lever 52 has a guide slit 100 in the bottom side thereof.
As shown in FIGS. 10A, 10B, 11A, and 11B, a rack member 101 that can slide with respect to the drive lever 52 in the front-rear direction by a predetermined stroke is attached to the drive lever 52 at an end adjacent to the front side. The rack member 101 has a rack gear 101a that extends in the front-rear direction. In addition, as shown in FIG. 6, a drive mechanism including a drive motor 102, a worm gear 103 attached to a rotating shaft of the drive motor 102, and a gear train 104 that transmits the power of the drive motor 102 from the worm gear 103 to the rack gear 101a is disposed on the bottom plate of the bottom case 4.
Accordingly, the drive mechanism rotates the drive motor 102 in one direction to move the drive lever 52 and the rack member 101 together toward the rear side using the worm gear 103, the gear train 104, and the rack gear 101a while the rack member 101 is disposed such that the rack member 101 does not project from the drive lever 52, as shown in FIGS. 10A and 10B. In addition, the drive mechanism rotates the drive motor 102 in the other direction to move the drive lever 52 and the rack member 101 together toward the front side using the worm gear 103, the gear train 104, and the rack gear 101a while the rack member 101 projects frontward from the drive lever 52, as shown in FIGS. 11A and 11B.
The fourth rotating arm 49 is made of a long metal plate and is placed on the left or right of the turntable 23a of the disk mount 23 (on the left in FIG. 3). The fourth rotating arm 49 is rotatably supported at an intermediate position along the second rotating arm 36 such that the fourth rotating arm 49 can rotate in the directions shown by the arrows d1 and d2 in a plane substantially parallel to the recording surface of the optical disk 2 to assist the eject operation. The fourth rotating arm 49 has a fourth contact member 50 that projects upward at an end of the fourth rotating arm 49 and that comes into contact with a rear peripheral portion of the optical disk 2.
The fourth contact member 50 is made of resin that is softer than the optical disk 2, and is a rotating roller with a small diameter that is rotatably attached to a principal surface of the fourth rotating arm 49 that faces the top plate 5a. 
In addition, the second rotating arm 36 has a restricting tab (not shown) that restricts the rearward rotation of the fourth rotating arm 49 when the fourth rotating arm 49 rotates rearward, that is, in the direction shown by the arrow d1. The restricting tab is formed by, for example, bending an edge of the second rotating arm 36 in a bracket shape.
The fourth rotating arm 49 is rotated by a connecting mechanism 81 shown in FIG. 3 in association with the sliding movement of the drive lever 52 shown in FIG. 5.
More specifically, the connecting mechanism 81 has a crank mechanism including a crank arm 82a that is rotatably supported by the first support shaft 37 and a connection arm 82b that connects the crank arm 82a to the fourth rotating arm 49. The connection arm 82b has a long hole 83b in which a guide pin 83a provided on the second rotating arm 36 is inserted. Accordingly, the crank mechanism rotates the crank arm 82a in association with the rotation of the fourth rotating arm 49.
As shown in FIG. 6, the connecting mechanism 81 also includes a first gear 84 that is rotated by the above-mentioned crank arm 82a, a second gear 85 that meshes with the first gear 84, and a rotating operation member 87 having a third gear 86 that meshes with the second gear 85 on the bottom plate of the bottom case 4.
The rotating operation member 87 serves to rotate the fourth rotating arm 49 in association with the sliding movement of the drive lever 52. The rotating operation member 87 includes an engagement pin 88 that engages with a slide member 92 that can slide in the front-rear direction with respect to the drive lever 52 and a positioning pin 89 for positioning and fixing the drive lever 52 by coming into contact with the rear side of the drive lever 52 in the recording/reproducing operation.
The rotating operation member 87 is urged in one rotational direction (clockwise in FIG. 6 in this case) by an extension spring 90. The extension spring 90 is attached to a retaining pin 90a provided on the bottom plate of the bottom case 4 at one end thereof and to a retaining pin 90b provided on the rotating operation member 87 at the other end thereof. Accordingly, the rotating operation member 87 is urged in one rotational direction. The rotating operation member 87 has a substantially arc shaped slit 91 for receiving the retaining pin 90a. 
The slide member 92 that can slide in the front-rear direction with respect to the drive lever 52 is attached to the rear side of the drive lever 52. The slide member 92 is urged frontward by first and second extension springs 93a and 93b, and is engaged with the engagement pin 88 of the rotating operation member 87 at the rear end thereof. Accordingly, the slide member 92 rotates the rotating operation member 87 in association with the sliding operation of the drive lever 52.
The first and the second extension springs 93a and 93b are attached to the drive lever 52 at the front end thereof and are attached to the slide member 92 at the rear end thereof, thereby urging the slide member 92 frontward with respect to the drive lever 52. The first extension spring 93a moves the drive lever 52 and the slide member 92 together in a normal operation and exerts a spring force of about 200 gf to 300 gf. The second extension spring 93b is used to protect the mechanism when the optical disk 2 is not ejected normally, and exerts a spring force of about 400 gf to 600 gf.
In addition, as shown in FIG. 7, a circuit board 105 on which a drive control circuit for controlling the components is mounted is provided on the bottom plate of the bottom case 4. The circuit board 105 is attached to the bottom plate of the bottom case 4 with screws at a position adjacent to the rear side. Electronic components (not shown), such as an IC chip, that form the drive control circuit, a connector 106 for providing electrical connections, and detection switches SW1, SW2, SW3, and SW4 for detecting various movements are arranged on the bottom plate of the bottom case 4 and the circuit board 105.
The drive control circuit controls the drive mechanism for driving the drive lever 52 while detecting the position of the drive lever 52 on the basis of detection signals obtained by the detection switches SW1, SW2, SW3, and SW4.
The detection switch SW1 is positioned adjacent to the front edge of the bottom case 4, and is switched on and off by the front end of the drive lever 52. The detection switches SW2, SW3, and SW4 are arranged along the front-rear direction with predetermined intervals therebetween along a side edge of the circuit board 105 that faces the drive lever 52. The detection switches SW2, SW3, and SW4 are switched on and off by a cam portion 107 provided on a side surface of the drive lever 52 as shown in FIGS. 8B and 8C.
The restricting mechanism 120 is used for restricting the movement of the arm mechanism 135 when the optical disk 2 is ejected through the slot 19. As shown in FIG. 3, the restricting mechanism 120 includes a pushing lever 76, a stopper 110 that engages with the pushing lever 76 when the optical disk 2 is ejected, and a second torsion coil spring 77 that presses the pushing lever 76. The stopper 110 is provided on, for example, the second rotating arm 36 and has a step-like portion that comes into contact with a contact pin 76a when the optical disk 2 is ejected through the slot 19. The stopper 110 has a contact surface that faces and comes into contact with the contact pin 76a in the rotational direction of the pushing lever 76.
As shown in FIG. 5, the second torsion coil spring 77 is attached to the chassis 11 at one end and to a contact pin 76c of the pushing lever 76 at the other end while a winding portion of the second torsion coil spring 77 is supported by the chassis 11. Accordingly, the contact pin 76a is urged in a direction such that the contact pin 76a comes into contact with the stopper 110. The pushing lever 76 is rotatable around the point P shown in FIG. 5. A pushing force applied to the optical disk 2 by the arm mechanism 135 when the contact pin 76a engages with the stopper 110 in the ejection operation of the optical disk 2 is set to be smaller than the frictional force applied to the optical disk 2 at the slot 19. The first torsion coil spring 75, for example, applies a rotating force to the first rotating arm 35 and the second rotating arm 36 such that the engagement between the contact pin 76a of the pushing lever 76 and the stopper 110 is canceled when the optical disk 2 is pulled out from the slot 19.
Accordingly, in the restricting mechanism 120, the cam pin 76b on the pushing lever 76 slides along a cam groove 78 formed in the drive lever 52 in association with the rearward sliding movement of the drive lever 52, and the pushing lever 76 rotates against the urging force applied by the second torsion coil spring 77 when the drive lever 52 reaches the rear end. Thus, the state in which the pushing lever 76 presses the second rotating arm 36 to urge the first rotating arm 35 and the second rotating arm 36 toward each other is switched to the state in which the first rotating arm 35 and the second rotating arm 36 are not urged toward each other.
The arm mechanism 135 performs a load operation for pulling the optical disk 2 into the housing 3 through the slot 19, a centering operation for positioning the optical disk 2 at the disk mounting position, and an eject operation for ejecting the optical disk 2 from the housing 3 through the slot 19 by causing the first rotating arm 35, the second rotating arm 36, the third rotating arm 46, and the fourth rotating arm 49 to operate in corporation with each other.
As shown in FIG. 3, the disk drive device 1 includes a base-lifting mechanism 55 that moves the base 27 vertically in association with the sliding movement of the drive lever 52.
The base-lifting mechanism 55 moves the base 27 upward to a chucking position shown in FIG. 13 where the optical disk 2 positioned at the disk mounting position is placed on the turntable 23a of the disk mount 23, downward to a releasing position shown in FIG. 12 where the optical disk 2 is released from the turntable 23a of the disk mount 23, and to an intermediate position between the chucking position and the releasing position shown in FIG. 14 where signals are recorded on or reproduced from the optical disk 2.
More specifically, as shown in FIG. 8C, the drive lever 52 has the first cam slit 95 having portions corresponding to the chucking position, the releasing position, and the intermediate position and that extends in the longitudinal direction of the drive lever 52 in the side that faces the base 27.
In addition, as shown in FIG. 5, the cam lever 56 that extends along the rear side of the base 27 is arranged on the bottom plate of the bottom case 4. As shown in FIGS. 9A and 9B, the cam lever 56 is made of a long, flat plate member and slides in a direction substantially perpendicular to the sliding direction of the drive lever 52 as the drive lever 52 slides in the front-rear direction. The cam lever 56 has a cam tab 57 that is bent upward along the side of the cam lever 56 that faces the base 27 at an intermediate position thereof. As shown in FIG. 5, a horizontal portion 57a of the cam tab 57 has a first cam portion 74a that corresponds to a large-diameter disk with a diameter of 12 cm and a second cam portion 74b that corresponds to a small-diameter disk with a diameter of 8 cm and that is formed as a slit-shaped cutout at a position closer to the front side than the first cam portion 74a. As shown in FIG. 9B, the cam tab 57 has a second cam slit 96 that includes portions corresponding to the chucking position, the releasing position, and the intermediate position and that extends in the longitudinal direction of the cam tab 57.
The second cam slit 96 includes a first horizontal portion 96a for positioning the base 27 at the releasing position, a top portion 96b for positioning the base 27 at the chucking position, and a second horizontal portion 96c for positioning the base 27 at the intermediate position.
The cam lever 56 has a pair of guide slits 97a and 97b that are aligned with each other in the principal plane of the cam lever 56, and a pair of headed guide pins 98a and 98b that project from the bottom plate of the bottom case 4 are engaged with the guide slits 97a and 97b, respectively, as shown in FIG. 6. Accordingly, the cam lever 56 is supported such that the cam lever 56 can slide in the direction substantially perpendicular to the sliding direction of the drive lever 52, that is, in the left-right direction along the rear side of the base 27.
The cam lever 56 has a guide pin 99 shown in FIG. 6 that projects upward at the intersecting point of the cam lever 56 and the drive lever 52. As shown in FIG. 6, the guide pin 99 slides along the guide slit 100 in association with the sliding movement of the drive lever 52 in the front-rear direction, and accordingly the cam lever 56 slides in the direction perpendicular to the sliding direction of the drive lever 52.
In the link mechanism 41, the second support shaft 44 becomes engaged with the first cam portion 74a or the second cam portion 74b depending on the positional relationship between the first rotating arm 35 and the second rotating arm 36 that differs between the case in which the large-diameter disk is inserted into the housing 3 through the slot 19 and the case in which the small-diameter disk is inserted into the housing 3 through the slot 19.
More specifically, when the large-diameter disk is inserted, the second support shaft 44 becomes engaged with the first cam portion 74a and slides along the guide slit 45 in association with the sliding movement of the cam lever 56 in the left-right direction. Accordingly, the first rotating arm 35 and the second rotating arm 36 are rotated toward or away from each other in accordance with the outer diameter of the large-diameter disk.
When the small-diameter disk is inserted, the second support shaft 44 becomes engaged with the second cam portion 74b and slides along the guide slit 45 in association with the sliding movement of the cam lever 56 in the left-right direction. Accordingly, the first rotating arm 35 and the second rotating arm 36 are rotated toward or away from each other in accordance with the outer diameter of the small-diameter disk.
In addition, as shown in FIG. 6, a bent member 58 that is bent along the rear side of the base 27 is provided on the bottom plate of the bottom case 4. The bent member 58 has a vertical slit (not shown) for moving the base 27 vertically.
The first support shaft 59 shown in FIG. 4 that is formed on the base 27 is supported by being engaged the first cam slit 95 formed in the drive lever 52 shown in FIG. 8C. The second support shaft 60 is supported by being engaged with the second cam slit 96 formed in the cam tab 57 and the vertical slit formed in the bent member 58. The third support shaft 62 is rotatably supported by a shaft hole 61 formed in a side plate of the bottom case 4. The fixing support portion 65 is fixed and supported on the bottom plate of the bottom case 4 with a screw 64 with an insulator 63 formed of a viscoelastic member, such as rubber, interposed between the fixing support portion 65 and the bottom plate of the bottom case 4.
Accordingly, in the base-lifting mechanism 55, the first support shaft 59 slides in the first cam slit 95 formed in the drive lever 52 and the second support shaft 60 slides in the second cam slit 96 formed in the cam lever 56 and the vertical slit formed in the bent member 58 in association with the sliding movements of the drive lever 52 and the cam lever 56. Thus, a section of the base 27 in which the disk mount 23 is mounted moves vertically with respect to a section of the base 27 adjacent to the front side between the chucking position, the releasing position, and the intermediate position.
Referring to FIG. 3, a push-up pin 66 for removing the optical disk 2 mounted on the turntable 23a of the disk mount 23 from the turntable 23a when the base 27 is moved downward by the base-lifting mechanism 55 is provided on the bottom plate of the bottom case 4. The push-up pin 66 projects upward from the bottom plate of the bottom case 4 at a position near the disk mount 23 of the base unit 22, more specifically, at a position closest to the disk mount 23 along the rear side of the base 27.
Next, the operation of the disk drive device 1 having the above-described structure will be described below.
As shown in FIG. 15, in the initial state (HOME state) in which a large-diameter disk 2A is not yet inserted, the end portions of the first rotating arm 35 and the second rotating arm 36 are separated from each other by a predetermined angle in the disk drive device 1. More specifically, as shown in FIG. 3, the minimum distance L2 between the rotating roller 73a of the first front contact member 38 and the rotating roller 73c of the second front contact member 40 is smaller than the diameter of a small-diameter disk 2B.
In the HOME state, the third rotating arm 46 is positioned such that the front end thereof is farther away from the center in the left-right direction and closer to the front side than the base end thereof, and the fourth rotating arm 49 is positioned in the front section of the bottom case 4 such that the front end thereof is closer to the center in the left-right direction and closer to the front side than the base end thereof.
The disk drive device 1 can perform the load operation irrespective of whether the large-diameter disk 2A or the small-diameter disk 2B is inserted into the housing 3 through the slot 19.
More specifically, when the large-diameter disk 2A is inserted into the housing 3 through the slot 19, a rear peripheral portion of the large-diameter disk 2A that is inserted into the housing 3 through the slot 19 comes into contact with the first front contact member 38 of the first rotating arm 35 and the second front contact member 40 of the second rotating arm 36, as shown in FIG. 15.
Then, when the large-diameter disk 2A inserted through the slot 19 is pushed further into the housing 3, as shown in FIG. 16, the large-diameter disk 2A is held between the first front contact member 38 and the second front contact member 40 of the first rotating arm 35 and the second rotating arm 36, respectively, at the outer peripheral portion thereof. At this time, the first rotating arm 35 and the second rotating arm 36 are rotated away from each other, that is, in the directions shown by the arrows a2 and b2 in FIG. 16, against the urging forces applied by the torsion coil spring 71d and the second torsion coil spring 77 while the first front contact member 38 and the second front contact member 40 are in contact with the rear peripheral portion of the large-diameter disk 2A.
Then, when the third rotating arm 46 is rotated by a predetermined amount and reaches the position shown in FIG. 16, the detection switch SW2 provided on the circuit board 105 is pressed, which causes the drive mechanism to start sliding the drive lever 52 rearward.
Accordingly, the third rotating arm 46 is further rotated in the direction shown by the arrow c1 in FIG. 16. In addition, the third contact member 48 of the third rotating arm 46 comes into contact with a front peripheral portion of the large-diameter disk 2A and pushes the front peripheral portion of the large-diameter disk 2A so as to move the large-diameter disk 2A into the housing 3.
Then, when the large-diameter disk 2A moved into the housing 3 reaches a position where the center hole 2a of the large-diameter disk 2A is closer to the rear side than the line connecting the first front contact member 38 and the second front contact member 40, as shown in FIG. 17, the first front contact member 38 and the second front contact member 40 move from the rear peripheral portion of the large-diameter disk 2A to the front peripheral portion thereof. Accordingly, the first rotating arm 35 and the second rotating arm 36 are rotated toward each other, that is, in the directions shown by the arrows a1 and b1 in FIG. 18, by the urging forces applied by the torsion coil spring 71d and the second torsion coil spring 77 while the first front contact member 38 and the second front contact member 40 are in contact with the front peripheral portion of the large-diameter disk 2A.
In addition, the fourth contact member 50 of the fourth rotating arm 49 is pushed by the rear peripheral portion of the large-diameter disk 2A and accordingly the fourth rotating arm 49 is rotated in the direction shown by the arrow d1 in FIG. 18. Then, when the large-diameter disk 2A reaches the disk mounting position shown in FIG. 18, the fourth rotating arm 49 comes into contact with the restricting tab (not shown) of the second rotating arm 36 and the rotation of the fourth rotating arm 49 is restricted.
Accordingly, the first rotating arm 35 and the second rotating arm 36 convey the large-diameter disk 2A inward to the disk mounting position shown in FIG. 18 while pushing the front peripheral portion of the large-diameter disk 2A.
When the small-diameter disk 2B is inserted into the housing 3 through the slot 19, a rear peripheral portion of the small-diameter disk 2B that is inserted into the housing 3 through the slot 19 comes into contact with the first front contact member 38 of the first rotating arm 35 and the second front contact member 40 of the second rotating arm 36, as shown in FIG. 22.
Then, when the small-diameter disk 2B inserted through the slot 19 is pushed further into the housing 3, as shown in FIG. 23, the small-diameter disk 2B is held between the first front contact member 38 and the second front contact member 40 of the first rotating arm 35 and the second rotating arm 36, respectively, at the outer peripheral portion thereof. At this time, the first rotating arm 35 and the second rotating arm 36 are rotated away from each other, that is, in the directions shown by the arrows a2 and b2 in FIG. 23, against the urging forces applied by the torsion coil spring 71d and the second torsion coil spring 77 while the first front contact member 38 and the second front contact member 40 are in contact with the rear peripheral portion of the small-diameter disk 2B.
Then, when the fourth rotating arm 49 is rotated by a predetermined amount and reaches the position shown in FIG. 23, the detection switch SW2 provided on the circuit board 105 is pressed, which causes the drive mechanism to start sliding the drive lever 52 rearward.
Accordingly, the third rotating arm 46 is rotated in the direction shown by the arrow c1 in FIG. 23. The third contact member 48 of the third rotating arm 46 comes into contact with a front peripheral portion of the small-diameter disk 2B and pushes the front peripheral portion of the small-diameter disk 2B so as to move the small-diameter disk 2B into the housing 3 through the slot 19.
Then, when the small-diameter disk 2B moved into the housing 3 reaches a position where the center hole 2a of the small-diameter disk 2B is closer to the rear side than the line connecting the first front contact member 38 and the second front contact member 40, as shown in FIG. 24, the first front contact member 38 and the second front contact member 40 move from the rear peripheral portion of the small-diameter disk 2B to the front peripheral portion thereof. Accordingly, the first rotating arm 35 and the second rotating arm 36 are rotated toward each other, that is, in the directions shown by the arrows a1 and b1 in FIG. 25, by the urging forces applied by the torsion coil spring 71d and the second torsion coil spring 77 while the first front contact member 38 and the second front contact member 40 are in contact with the front peripheral portion of the small-diameter disk 2B.
In addition, the fourth contact member 50 of the fourth rotating arm 49 is pushed by the rear peripheral portion of the small-diameter disk 2B and accordingly the fourth rotating arm 49 is rotated in the direction shown by the arrow d1 in FIG. 25. Then, when the small-diameter disk 2B reaches the disk mounting position shown in FIG. 26, the fourth rotating arm 49 comes into contact with the restricting tab (not shown) of the second rotating arm 36 and the rotation of the fourth rotating arm 49 is restricted.
Accordingly, the first rotating arm 35 and the second rotating arm 36 convey the small-diameter disk 2B inward to the disk mounting position (chucking position) shown in FIG. 26 while pushing the front peripheral portion of the small-diameter disk 2B.
As shown in FIGS. 18 and 26, after one of the large-diameter disk 2A and the small-diameter disk 2B having different diameters is conveyed to the disk mounting position by the first rotating arm 35 and the second rotating arm 36, the disk drive device 1 performs the centering operation for positioning the large-diameter disk 2A or the small-diameter disk 2B at the disk mounting position by holding the disk 2A or 2B with the first front contact member 38, the first rear contact member 39, the second front contact member 40, and the fourth contact member 50. More specifically, the center hole 2a of the large-diameter disk 2A or the small-diameter disk 2B and the engaging projection 28a of the turntable 23a are aligned with each other in the direction perpendicular to recording surface of the large-diameter disk 2A or the small-diameter disk 2B.
Next, after the centering operation of the large-diameter disk 2A or the small-diameter disk 2B, the disk drive device 1 performs the chucking operation for placing the large-diameter disk 2A or the small-diameter disk 2B positioned at the disk mounting position onto the turntable 23a of the disk mount 23 by causing the base-lifting mechanism 55 to move the moving the base 27 upward.
More specifically, when the base-lifting mechanism 55 moves the base 27 upward from the releasing position shown in FIG. 12 to the chucking position shown in FIG. 13, the engaging projection 28a enters the center hole 2a of the large-diameter disk 2A or the small-diameter disk 2B positioned at the disk mounting position. In addition, the peripheral portion around the center hole 2a of the large-diameter disk 2A or the small-diameter disk 2B is pushed against the contact projection 7 provided on the top plate 5a. Accordingly, the large-diameter disk 2A or the small-diameter disk 2B is placed on the turntable 23a such that the engaging projection 28a is engaged with the center hole 2a of the large-diameter disk 2A or the small-diameter disk 2B and the peripheral portion around the center hole 2a of the large-diameter disk 2A or the small-diameter disk 2B is retained by the retaining lugs 28b. Then, while the large-diameter disk 2A or the small-diameter disk 2B is placed on the turntable 23a, the base 27 is moved downward by the base-lifting mechanism 55 to the intermediate position shown in FIG. 14.
As shown in FIGS. 19 and 27, after the chucking operation, the disk drive device 1 is operated such that the first rotating arm 35 and the second rotating arm 36 are rotated away from each other, that is, in the directions shown by the arrows a2 and b2 in FIGS. 19 and 27, in association with the rearward sliding movement of the drive lever 52. At this time, the fourth rotating arm 49 is rotated together with the second rotating arm 36 while being in contact with the restricting tab (not shown). In addition, the third rotating arm 46 is slightly rotated in the direction shown by the arrow c2 in FIGS. 19 and 27 in association with the rearward movement of the drive lever 52.
Accordingly, the first front contact member 38, the first rear contact member 39, the second front contact member 40, the third contact member 48, and the fourth contact member 50 are separated from the outer peripheral portion of the large-diameter disk 2A or the small-diameter disk 2B placed on the turntable 23a. 
In the disk drive device 1, when a recording or reproducing command is transmitted from the drive control circuit in the state shown in FIG. 19 or 27, signals are recorded on or reproduced from the large-diameter disk 2A or the small-diameter disk 2B on the basis of this command. More specifically, the spindle motor 24a rotates the large-diameter disk 2A or the small-diameter disk 2B together with the turntable 23a and the pickup-conveying mechanism 26 moves the optical pickup 25 from the outer periphery toward the inner periphery. Then, under the focus servo control and the tracking servo control, TOC data recorded in a read-in area of the large-diameter disk 2A or the small-diameter disk 2B is read out. Then, when the signals are recorded, the optical pickup 25 is moved to a designated address in a program area of the large-diameter disk 2A or the small-diameter disk 2B on the basis of the obtained TOC data. When the signals are reproduced, the optical pickup 25 is moved to an address in the program area at which the designated data is recorded. Then, the optical pickup 25 performs an operation of writing or reading signals on the large-diameter disk 2A or the small-diameter disk 2B at a desired recording track.
In this disk drive device 1, when the eject button 21 provided on the display element 20 is pressed or an eject command is transmitted to the disk drive device 1 from a personal computer, first, the drive mechanism starts sliding the drive lever 52 frontward.
Then, as shown in FIGS. 18 and 26, the first rotating arm 35 and the second rotating arm 36 are slightly rotated toward each other, that is, in the directions shown by the arrows a1 and b1 in FIGS. 18 and 26, in association with the frontward sliding movement of the drive lever 52. At this time, the fourth rotating arm 49 is rotated together with the second rotating arm 36 while being in contact with the restricting tab.
Accordingly, the first front contact member 38, the first rear contact member 39, the second front contact member 40, and the fourth contact member 50 come into contact with the outer peripheral portion of the large-diameter disk 2A or the small-diameter disk 2B placed on the turntable 23a. 
Next, the disk drive device 1 performs a releasing operation for separating the large-diameter disk 2A or the small-diameter disk 2B from the turntable 23a of the disk-mounting portion 23 by causing the base-lifting mechanism 55 to move the base 27 downward to the releasing position.
More specifically, when the base 27 is moved downward to the releasing position, the end portion of the push-up pin 66 comes into contact with the large-diameter disk 2A or the small-diameter disk 2B placed on the turntable 23a at an inner peripheral region outside the signal-recording region. Accordingly, the large-diameter disk 2A or the small-diameter disk 2B is pushed upward and released from the turntable 23a. 
Next, the disk drive device 1 performs the eject operation for ejecting the large-diameter disk 2A or the small-diameter disk 2B on the disk-mounting portion 23 from the housing 3 through the slot 19.
When the large-diameter disk 2A is ejected from the housing 3 through the slot 19, first, as shown in FIG. 20, the fourth rotating arm 49 is rotated in the direction shown by the arrow d2 in FIG. 20 in association with the frontward sliding movement of the drive lever 52. Since the fourth contact member 50 of the fourth rotating arm 49 comes into contact with the rear peripheral portion of the large-diameter disk 2A, the fourth rotating arm 49 pushes the rear peripheral portion of the large-diameter disk 2A to eject the large-diameter disk 2A from the housing 3.
Then, when the large-diameter disk 2A is further moved toward the outside of the housing 3 and reaches a position where the center hole 2a of the large-diameter disk 2A is closer to the front side than the line connecting the first front contact member 38 and the second front contact member 40, as shown in FIG. 21, the first front contact member 38 and the second front contact member 40 move to the rear peripheral portion of the large-diameter disk 2A from the front peripheral portion thereof. Accordingly, the first rotating arm 35 and the second rotating arm 36 are rotated toward each other, that is, in the directions shown by the arrows a1 and b1 in FIG. 21, by the urging forces applied by the torsion coil spring 71d and the second torsion coil spring 77 while the first front contact member 38 and the second front contact member 40 are in contact with the rear peripheral portion of the large-diameter disk 2A.
When the first rotating arm 35 and the second rotating arm 36 move toward each other while the large-diameter disk 2A is being ejected, the contact pin 76a of the pushing lever 76 moves from the position shown in FIG. 20 in the direction shown by the arrow e1 and becomes engaged with the step portion of the stopper 110, as shown in FIG. 21. Accordingly, the pushing force applied to the stopper 110 from the contact pin 76a is not transmitted and a torque that tries to move the first rotating arm 35 and the second rotating arm 36 toward each other is considerably reduced compared to the case in which the stopper 110 is not provided.
The force by which the first rotating arm 35 and the second rotating arm 36 try to push the large-diameter disk 2A outward is sufficiently weaker than the frictional force between the large-diameter disk 2A and the curtain 32. Accordingly, the first rotating arm 35 and the second rotating arm 36 push the rear peripheral portion of the large-diameter disk 2A to convey the large-diameter disk 2A to the disk insertion/ejection position, that is, the position at which the center hole 2a of the large-diameter disk 2A is exposed to the outside of the housing 3 through the slot 19.
When the user removes the large-diameter disk 2A from the slot 19, the force that restricts the rotation of the first rotating arm 35 and the second rotating arm 36 is eliminated. Accordingly, the first rotating arm 35 and the second rotating arm 36 are moved toward each other to the HOME positions thereof by the urging force applied by the torsion coil spring 71d and second torsion coil spring 77. Thus, the eject operation is completed.
When the small-diameter disk 2B is ejected from the housing 3 through the slot 19, first, as shown in FIG. 28, the fourth rotating arm 49 is rotated in the direction shown by the arrow d2 in FIG. 28 in association with the frontward movement of the drive lever 52. Since the fourth contact member 50 of the fourth rotating arm 49 is in contact with the rear peripheral portion of the small-diameter disk 2B, the fourth rotating arm 49 pushes the rear peripheral portion of the small-diameter disk 2B to eject the small-diameter disk 2B from the housing 3.
Then, when the small-diameter disk 2B is further moved toward the outside of the housing 3 and reaches a position where the center hole 2a of the small-diameter disk 2B is closer to the front side than the line connecting the first front contact member 38 and the second front contact member 40, as shown in FIG. 23, the first front contact member 38 and the second front contact member 40 move to the rear peripheral portion of the small-diameter disk 2B from the front peripheral portion thereof. Accordingly, the first rotating arm 35 and the second rotating arm 36 are rotated toward each other, that is, in the directions shown by the arrows a1 and b1 in FIG. 23, by the urging forces applied by the torsion coil spring 71d and the second torsion coil spring 77 while the first front contact member 38 and the second front contact member 40 are in contact with the rear peripheral portion of the small-diameter disk 2B.
Accordingly, the first rotating arm 35 and the second rotating arm 36 push the rear peripheral portion of the small-diameter disk 2B until the small-diameter disk 2B reaches the disk insertion/ejection position. Similar to the large-diameter disk 2A, the disk insertion/ejection position of the small-diameter disk 2B is set to a position where the center hole 2a of the small-diameter disk 2B is placed outside the slot 19.
Although the curtain 32 is used to apply the frictional load to the large-diameter disk 2A or the small-diameter disk 2B, other friction members may also be provided at a position near the slot 19.
As described above, the disk-conveying mechanism 34 included in the disk drive device 1 according to the present embodiment has the restricting mechanism 120 that restricts the movement of the arm mechanism 135. Therefore, the movement of the arm mechanism 135 can be restricted when, for example, the large-diameter disk 2A is ejected through the slot 19, and accordingly the pushing force applied to the large-diameter disk 2A by the arm mechanism 135 can be adjusted (reduced). Thus, the distance by which the large-diameter disk 2A is pushed out from the slot 19 can be adjusted. When, for example, the distance by which the large-diameter disk 2A is pushed out from the slot 19 is set to substantially one-half of the diameter of the large-diameter disk 2A, the large-diameter disk 2A can be easily removed from the slot 19 and the large-diameter disk 2A can be prevented from falling from the slot 19. In particular, if the adjustment is such that the eject operation is finished when the center hole 2a of the large-diameter disk 2A or the small-diameter disk 2B is completely out of the slot 19, the user can easily remove the large-diameter disk 2A or the small-diameter disk 2B from the slot 19.
In addition, the disk-conveying mechanism 34 includes the stopper 110 attached to the second rotating arm 36 and the contact pin 76a that comes into contact with the stopper 110 when the second rotating arm 36 is rotated inward. The contact pin 76a applies a rotational force that rotates the second rotating arm 36 inward along the recording surface. Accordingly, when the second rotating arm 36 is rotated inward and the contact pin 76a comes into contact with the stopper 110, the pushing force applied to the large-diameter disk 2A by the second rotating arm 36 that is pushed by the contact pin 76a via the stopper 110 is reduced. Thus, the distance by which the large-diameter disk 2A is pushed out from the slot 19 can be adjusted.
In addition, the pushing force applied to the optical disk 2 by the arm mechanism 135 when the contact pin 76a comes into contact with the stopper 110 when the optical disk 2 is ejected is set to be smaller than the frictional force applied to the optical disk 2 from the slot 19 (from the curtain 32 on the slot 19). Accordingly, when the movement of the arm mechanism 135 is restricted by the stopper 110, the large-diameter disk 2A that is being ejected can be held in the slot 19 by the frictional force applied between the slot 19 (the curtain 32 on the slot 19) and the large-diameter disk 2A.
In addition, when the optical disk 2 is pulled out from the slot 19, the first torsion coil spring 75, for example, applies a rotational force to the first rotating arm 35 and the second rotating arm 36 so that the contact pin 76a of the pushing lever 76 becomes disengaged from the stopper 110. Accordingly, when the large-diameter disk 2A is pulled out from the slot 19, the frictional force between the slot 19 (the curtain 32 on the slot 19) and the large-diameter disk 2A is eliminated and the contact pin 76a of the pushing lever 76 becomes disengaged from the stopper 110. Therefore, the first rotating arm 35 and the second rotating arm 36 can be returned to, for example, the HOME state without using a mechanism for cancelling the engagement.
The disk-conveying mechanism 34 includes the second torsion coil spring 77 and the pushing lever 76 having the contact pin 76a and the stopper 110 has the contact surface that faces and comes into contact with the contact pin 76a in the rotational direction of the pushing lever 76. Accordingly, the contact pin 76a of the pushing lever 76 that is rotated by the urging force of the second torsion coil spring 77 can be brought into contact with the contact surface of the stopper 110 to restrict the rotation of the first and the second rotating arms 35 and 36 when the first and the second rotating arms 35 and 36 are rotated toward each other.
Second Embodiment
Next, a disk drive device according to a second embodiment of the present invention will be explained below. In the present embodiment, components similar to those of the first embodiment are denoted by the same reference numerals and explanations thereof are thus omitted.
FIG. 29 is a plan view illustrating the structure of a disk drive device 200 according to the second embodiment.
In the first embodiment, the stopper 110 has a step-like portion that engages with the contact pin 76a of the pushing lever 76. In the present embodiment, a stopper 160 having a lock portion 112, which is a recess for locking the contact pin 76a of the pushing lever 76, is provided. When, for example, the large-diameter disk 2A is ejected, the contact pin 76a of the pushing lever 76 becomes fitted to the lock portion 112 of the stopper 160 so to restrict the rotation of the first rotating arm 35 and the second rotating arm 36.
A detector 111 for detecting whether or not the large-diameter disk 2A, for example, is inserted into the slot 19 is disposed near the slot 19 of the disk drive device 200. A photosensor or the like is used as the detector 111.
The operation of the disk drive device 200 according to the present embodiment is similar to that of the first embodiment. However, since the stopper 160 has the recessed lock portion 112, when, for example, the large-diameter disk 2A is ejected, the contact pin 76a is rotated in the direction shown by the arrow e1 and becomes fitted to the lock portion 112, as shown in FIG. 30. Since the rotation of the second rotating arm 36 is restricted (locked) such that the contact pin 76a is fitted in the lock portion 112, the rotation of the first rotating arm 35 and the second rotating arm 36 toward each other can be restricted.
When the user pulls out the large-diameter disk 2A from the slot 19, the detector 111 detects that the large-diameter disk 2A has been pulled out and the drive control circuit (not shown) slightly moves the drive lever 52 in the direction shown by the arrow f.
The drive lever 52 has the cam groove 78 for rotating the pushing lever 76, and the cam groove 78 pushes the cam pin 76b of the pushing lever 76 so that the pushing lever 76 is rotated in the direction shown by the arrow e2. Accordingly, the cam pin 76b of the pushing lever 76 is released from the lock portion 112 of the stopper 160 and the first rotating arm 35 and the second rotating arm 36 return to the HOME positions due to the urging force of the first torsion coil spring 75.
The disk drive device 200 according to the present embodiment includes the detector 111 that detects whether or not the large-diameter disk 2A, for example, is inserted into the slot 19 and the drive lever 52 for releasing the cam pin 76b from the lock portion 112 when the detector 111 detects that the large-diameter disk 2A is not inserted in the slot 19. In addition, the pushing lever 76 has the contact pin 76a and the stopper 160 has the lock portion 112 that engages with the contact pin 76a when the large-diameter disk 2A, for example, is ejected. Accordingly, the contact pin 76a can be fitted to the lock portion 112 when the large-diameter disk 2A is ejected, and the rotation of the first rotating arm 35 and the second rotating arm 36 can be reliably restricted. In addition, when the detector 111 detects that the large-diameter disk 2A is not inserted in the slot 19, the drive lever 52 releases the contact pin 76a from the lock portion 112 and the first rotating arm 35 and the second rotating arm 36 can be returned to, for example, the HOME state.
In addition, the distance by which the large-diameter disk 2A is pushed out from the slot 19 can be adjusted without relying on the frictional force between the large-diameter disk 2A and the curtain 32 on the slot 19 by adjusting the recess shape of the lock portion 112.
The electronic apparatuses including the above-described disk drive device 1 may be computers including laptop and desktop personal computers, personal digital assistances (PDA), electronic dictionaries, cameras, display apparatuses, audio/visual apparatuses, game apparatuses, car navigation apparatuses, and other various electric apparatuses.
In the above-described embodiments, the stopper 110 or 160 is provided on the second rotating arm 36. However, a similar stopper may also be provided on, for example, the first rotating arm 35. In such a case, the distance by which the large-diameter disk 2A, for example, is pushed out from the slot 19 can be more reliably adjusted.
It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and alterations may occur depending on design requirements and other factors insofar as they are within the scope of the appended claims or the equivalents thereof.

## Claims

1. A disk drive device comprising:
a housing having a slot through which a disk-shaped recording medium having a recording surface is inserted and ejected;
a mount that is disposed in the housing and on which the recording medium inserted through the slot is mounted;
a conveying mechanism including an arm unit that extends and retracts along a plane substantially parallel to the recording surface of the recording medium to convey the recording medium between the slot and the mount while holding a peripheral portion of the recording medium; and
a restricting unit that restricts the movement of the arm unit;
wherein the conveying mechanism further includes:
a stopper attached to the arm unit; and
a rotational-force-applying unit that includes an engaging portion that becomes engaged with the stopper when the arm unit retracts and that applies a rotational force for retracting the arm unit;
wherein a pushing force applied to the recording medium by the aim unit when the movement of the arm unit is restricted is set to be smaller than a frictional force applied to the recording medium when the recording medium is ejected through the slot; wherein the rotational-force-applying unit applies the rotational force to the arm unit such that the engagement between the stopper and the engaging portion is canceled when the recording medium is pulled out from the slot.

2. The disk drive device according to claim 1, wherein the rotational-force-applying unit further includes:
an elastic body; and
a lever that is rotated by an urging force applied by the elastic body and on which a pin is provided as the engaging portion,
wherein the stopper has a contact surface that faces and comes into contact with the pin in a rotational direction of the lever.

3. The disk drive device according to claim 1, wherein the stopper has a lock portion that engages with the engaging portion to lock the engaging portion, and wherein the disk drive device further comprises:
a detector that detects whether or not the recording medium is inserted into the slot; and
a releasing mechanism that releases the engaging portion from the stopper when the detector detects that the recording medium is not inserted into the slot.

4. The disk drive according to claim 3, wherein the rotational-force-applying unit further includes:
an elastic body; and
a lever that is rotated by an urging force applied by the elastic body and on which a pin is provided as the engaging portion,
wherein the lock portion of the stopper is a recess into which the pin is fitted.

5. The disk drive device according to claim 1, wherein the disk drive device is capable of receiving a first disk and a second disk as the recording medium, the first disk having a first diameter and the second disk having a second diameter that is different from the first diameter.