JP2006331528A - Optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce energy consumption and to reduce an unnecessary burden on a driver (motor) and a driving force transmitter by smoothly switching driving of an optical head, a disk tray and a traverse chassis so as to adjust driving force properly. <P>SOLUTION: On a side opposite to a gear teeth formed side of a sub rack 421, provided is a gate-shaped elastic member (leaf spring 43) which contacts with a protrusion part 22 formed at the traverse chassis 21. The leaf spring 43 comprises a pair of fixed parts 431 fixed to a sub rack 422, a support part 432 for connecting the pair of fixed parts 431; and a mountain-shaped part 433 which is formed integrally with the fixed part in the center of the support part 432 and which abuts the protrusion part 22. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to an optical disc apparatus that reads information recorded on an optical disc or records information on an optical disc.

In recent years, CD (Compact Disc), DVD (Digita) have been used as recording media for video, audio or information.
l Versatile Disc) is widely used. An optical disc apparatus using these optical discs as a recording medium records data by irradiating the recording surface of the optical disc with laser light, and / or detects the light reflected by the recording surface, thereby reading out the data. Is going.

Many of the optical disk devices have a disk tray on which the optical disk is placed. The optical disc apparatus places an optical disc on the disc tray, slides the disc tray, and conveys the optical disc to a predetermined position in the casing. Then, a traverse chassis provided with a disk driving means for driving the optical disk and an optical head for irradiating the optical disk with laser light is moved (chucking) so that the optical disk is mounted on the disk driving means. ) At this time, the optical disk is sandwiched by the disk drive means so as not to slip in the circumferential direction after leaving the disk tray.

Thereafter, while the optical disk is driven (rotated) by the disk drive means, the optical head is moved in the radial direction of the optical disk, and laser light is irradiated from the optical head to the optical disk, thereby recording or reading data. I do.

When the optical disk is irradiated with laser light from the optical head, the optical head must first move to the home position. When the optical head is moved to the home position, the optical head is moved to a position on the inner circumference side of the optical disk and then moved to a home position slightly moved in the outer circumference direction. Thereby, the optical head can be accurately arranged at the home position.

When the optical disk is ejected (unloaded), the optical head is moved, and after the optical head is stopped at the predetermined position, the traverse chassis is moved. By moving the traverse chassis, the optical disc is removed from the state of being chucked by the disc driving means and placed on the disc tray. With the optical disc placed on the disc tray, the disc tray is unloaded from the housing to complete the ejection of the optical disc.

If the traverse chassis or the disc tray is moved while the optical head is not moved to a predetermined position on the innermost circumference of the optical disc, the optical head comes into contact with a member such as the disc tray and the physical Damage may occur, causing failure and damage. The disk tray, the traverse chassis, and the optical head are driven by a single motor, and the drive of the disk tray, traverse chassis, and optical head must be switched at an appropriate timing.

For example, in the invention described in Japanese Patent Application Laid-Open No. 2004-178767, an optical pickup driving unit that drives an optical head, a tray driving unit, and a chassis driving unit are driven by a single motor. It shows the one provided with a detection switch for detecting whether or not the pickup has reached a predetermined position on the inner periphery of the optical disc. Based on the detection by the detection switch, the operation of each driving means is switched.

In the invention described in Japanese Patent Application Laid-Open No. 2004-273062, a protrusion that abuts the optical head is provided, and the voltage of the motor provided in the driving means that drives the optical head is detected. When an increase in voltage that occurs when the optical head comes into contact with the protrusion and the motor stops is detected, the supply of electric power to the motor is stopped and the optical head is stopped.

In the invention described in Japanese Patent Application Laid-Open No. 2002-288911, the disk transport mechanism and the optical pickup feeding mechanism are driven by one motor. It is shown that the drive mechanism of the disk transport mechanism and the optical pickup feed mechanism is switched at the rotation angle of the gear.
JP 2004-178767 A JP 2004-273062 A JP 2002-288911 A

However, if it is intended to provide a detection switch for detecting that the optical head has reached a predetermined position as described above, it must be provided at a position where it does not interfere with the traverse chassis and the disk tray. The problem of deteriorating arises. In addition, a dedicated printed circuit board for controlling the detection switch is required, and the degree of freedom in design is further reduced.

In order to provide the detection switch, it is necessary to provide the switch itself, a printed wiring board for control, and the like, which increases the number of parts constituting the disk device and increases the manufacturing cost of the disk device.

Further, when the optical head reaches a predetermined position, the optical head is brought into contact with the protrusion, and the load change of the motor at that time is detected to detect a change in the voltage supplied to the motor, so that the optical head reaches the predetermined position. In the case of determining that the optical head has been moved, even if the movement of the optical head is restricted in a state where the optical head is not in contact with the protrusion, the load of the motor fluctuates and it is recognized that the optical head has reached a predetermined position.
In this state, if the operation is switched to the next operation, the position of the optical head is not appropriate, and there is a possibility that the optical head, the disk tray, the traverse chassis, etc. may break down or be damaged. In addition, the optical disk may be damaged.

Furthermore, in the case of switching the drive mechanism of the disk transport mechanism and the optical pickup feed mechanism at the rotation angle of the gear, if the meshing of the gear shifts during driving or mounting, the switching timing of the drive mechanism shifts. It will cause failure and damage.

Therefore, the present invention has been made in view of the above problems, and can smoothly switch the drive of the optical head, the disk tray, and the traverse chassis, and can reduce the manufacturing cost with a simple structure. An object is to provide an optical disk device.

The present invention has been made in view of the above problems, and includes an optical head, a disk tray,
Since the driving force for driving the traverse chassis can be adjusted appropriately, energy consumption can be reduced, and the driving device (motor) and the driving force transmission device can be prevented from being loaded more than necessary. Therefore, an object of the present invention is to provide an optical disc apparatus that can be used stably over a long period of time.

To achieve the above object, the present invention supports a slidable disc tray on which an optical disc is placed, a slidable optical head that irradiates the optical disc with laser light, and the optical head and the optical disc. A traverse unit that can be moved up and down with a turntable, a drive motor that serves as a power source for sliding the disk tray, sliding the optical head, and lifting the traverse unit, and supporting the traverse unit and the drive motor And a loader chassis unit equipped with a clamp that clamps and chucks the optical disk when the traverse unit is lifted, and the drive motor is driven forward and reverse. That outputs encoder pulses to detect the rotation speed The rack of the optical head includes an elastic member, and the traverse unit includes a protrusion that contacts the elastic member when the optical head moves to the inner peripheral side of the optical disc. The spring receives the driving force received from the driving motor when the optical head reaches a predetermined position where the driving force of the driving motor on the inner peripheral side can be received, and the projection and the projection contact each other. When the force is small, the chevron portion is formed so as not to exceed the protruding portion. When the traverse unit is lowered, the chevron portion exceeds the projecting portion when the traverse unit is lowered. Encoder pulse output from the encoder when the leaf spring comes into contact with the projection and the optical head stops It detects the change, and switches the driving force output from the drive motor.

According to this configuration, without using a complicated device such as a switch, “operation of the optical head”,
Switching between “traverse unit operation” and “disc tray operation” can be performed. In addition, since the optimum driving force can be selected for each operation, energy consumption can be reduced. In addition, since it is possible to suppress an unnecessary load on the driving motor and the driving force transmission mechanism (driving force transmission gear mechanism, various racks, various cams), it is possible to perform a stable operation over a long period of time.

In the above configuration, the optical disk unit is moved toward the inner periphery of the optical disk,
When the traverse unit is lowered and the disk tray is ejected, a first voltage that can slide the optical head and output a driving force that the leaf spring cannot get over the protrusion is applied to the drive motor. And the second voltage capable of exerting a driving force for eliminating chucking between the turntable and the clamp is detected when it is detected that the amplitude of the encoder pulse output from the encoder no longer changes. A third voltage capable of outputting a driving force capable of driving the disc tray is input to the drive motor at a predetermined switching timing after being input to the motor and starting to input the second voltage to the drive motor. You may do.

Further, in the above configuration, when the optical head is moved to the inner peripheral side and moved to a predetermined home position, the driving force can slide the optical head and the leaf spring cannot get over the protrusion. Is input to the drive motor, and when it is detected that the amplitude of the encoder pulse output from the encoder does not change,
A fourth voltage capable of moving the optical head in the outer peripheral direction may be input to the drive motor, and the input voltage may be set to 0 at a predetermined switching timing.

Further, in the above configuration, when the disc tray is inserted into the optical disc device,
When a fifth voltage capable of outputting a driving force capable of driving the disc tray and raising the traverse unit is input to the driving motor, and it is detected that the frequency of the encoder pulse output from the encoder has increased. The sixth voltage may be inputted to the drive motor so that the optical head can be moved in the outer circumferential direction and the frequency of the encoder pulse becomes a predetermined value.

In the above configuration, the switching timing may be determined based on the passage of time, or may be determined based on the number of encoder pulses output from the encoder.

More specifically, the present invention will be described in detail. A drive motor as a power source and a slide rack that is slidably opened and closed with respect to the optical disc apparatus main body and interlocked with a tray rack for receiving the drive force of the drive motor. A guide groove that is a mechanism, a disc tray on which an optical disc can be placed, and a laser beam that irradiates the optical disc, and is slidable back and forth to the inner or outer periphery of the optical disc, An optical head having a rack provided with a rack boss and receiving a driving force of the driving motor, and a slide boss for receiving the driving force of the driving motor. A spindle motor for rotating the optical disk, and a turn antenna that is rotatably attached to the spindle motor and supports the optical disk. In order to transmit a driving force of the drive motor and a lever trigger having a connecting boss, and a traverse chassis on which a bull is mounted, a trigger guide engaging with a rack boss of the rack, and interlocking with the movement of the optical head The driving force transmission gear mechanism is mounted, the traverse unit to which the optical head is slidably mounted, and the driving motor are mounted, and the driving force of the driving motor is received by meshing with the driving force transmission gear mechanism. On the other hand, a cam that pivotally supports a gear tray having an intermittent portion for canceling the engagement with the drive force transmission gear mechanism and preventing the drive force from being transmitted, and that is further engaged with the gear tray. The slider rack includes a cam groove that engages a sliding boss of the traverse chassis, and a guide groove of the disk tray. And a connecting groove that engages the connecting boss of the lever trigger and interlocks the traverse chassis and the disk tray, while the cam slider that interlocks with the movement of the lever trigger and the traverse unit are raised. An optical disc apparatus including a loader chassis unit having a turntable and a clamp for chucking the optical disc, and outputs an encoder pulse for detecting the number of rotations in forward / reverse rotation driving to the drive motor The optical head rack includes a leaf spring, and the traverse unit includes a protrusion that contacts the leaf spring when the optical head moves toward the inner periphery of the optical disc. The leaf spring includes a pair of fixing portions and a support for connecting the pair of fixing portions. And a chevron formed at the approximate center of the support part, and when the optical head reaches a predetermined position where it can receive the driving force of the drive motor on the inner periphery side, The chevron is formed so that the chevron does not exceed the projection when the chevron and the projection abut and the driving force received from the drive motor is small. When the unit descends, the chevron part moves over the projection part to a position where it does not receive a driving force from the drive motor, and the optical head slides to form the chevron part and the projection part. The rotation of the drive motor stops and the amplitude of the encoder pulse output from the encoder does not change for a certain period, or the frequency of the encoder pulse changes. The driving force output from the data is switched.

According to the present invention, it is possible to provide an optical disc apparatus that can smoothly switch the driving of the optical head, the disc tray, and the traverse chassis, and that can reduce the manufacturing cost with a simple structure.

In addition, according to the present invention, it is possible to provide an optical disk loading apparatus and an optical disk apparatus that can extend the life of a mold necessary for manufacturing a drive chassis and reduce the waste of materials and energy. it can.

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 show an optical disc apparatus according to the present invention. FIG. 1 is a perspective view of the optical disk device, and FIG. 2 is a schematic configuration diagram of the optical disk device viewed from above. FIG. 3 is a schematic configuration diagram of the inside of the optical disc apparatus as viewed from above, and FIG. 4 is a schematic configuration diagram of the inside of the optical disc device as viewed from below. 5 and 6 are schematic configuration diagrams of the inside of the optical disk apparatus shown in FIG. 3 as viewed from the front panel side and the side. For convenience, in FIGS. 3 to 6, the disc tray itself is omitted, and only a guide groove 11 and a tray rack 12 described later are illustrated.

The optical disc apparatus A irradiates a loaded optical disc with a laser beam to read and / or write data. As shown in FIG. 2, the optical disc apparatus A includes a disc tray 1, a traverse unit 2, and a loader chassis unit 3.
<About disc tray>
As shown in FIG. 1, the optical disc apparatus A is arranged so that the disc tray 1 can enter and exit from a slit-shaped entrance / exit St provided in the front panel Fp of the outer housing Oh.

The optical disc is placed in a state where the disc tray 1 is ejected from the optical disc apparatus A through the entrance / exit St, and the disc is inserted into a playable / recordable area by inserting the disc tray 1. Further, by ejecting the disc tray 1 from the optical disc apparatus A, the optical disc inserted in the optical disc apparatus A is ejected (unloaded).

As shown in FIG. 4, a guide groove 11 that is bent stepwise on the lower surface of the disc tray 1 and a tray rack 12 that transmits a driving force from a gear tray 33 described later are provided in the longitudinal direction of the disc tray 1. The guide groove 11 has a linear portion 111 extending in the sliding direction of the disk tray 1, a skewed portion 112 that bends obliquely at a predetermined position, and an orthogonal portion 113 that bends so as to be orthogonal to the sliding direction. ing.

The direction in which the front panel Fp is provided is expressed as the front side (“F”), and the direction facing the front side is expressed as the rear side (“R”). Further, the vertical traversal in the direction extending from the front side to the rear side is represented as a side side (“S”).
<About the traverse unit>
As shown in FIG. 3, the traverse unit 2 includes a traverse chassis 21, an optical head 4,
The lever trigger 5, the spindle motor 6, the driving force transmission gear mechanism 7, the encoder 8 and the protrusion 22 are attached. The traverse chassis 21 is screwed to one end on the rear side of the loader chassis 31 with a mounting screw.

As shown in FIG. 2, the traverse chassis 2 covers mounting holes provided in the traverse chassis 21 around the circumference (circumference) of the hole itself and both ends in the axial direction, and a loader chassis 31.
A floating rubber (damper) 210 having an opening into which a boss provided in the boss can be inserted is inserted and inserted, and the traverse chassis 21 is placed so that the boss penetrates the mounting hole. The boss of the chassis 31 is fixed with a mounting screw.

The mounting screws are fixedly mounted so that there is a fixed distance between the screw head and the loader chassis 31. By using this interval, the traverse chassis 21 (traverse unit 2) can be rotated about the mounting screw as a fulcrum. When reading data from or writing data to the optical disk, the traverse chassis 21 rises and holds the optical disk ( Chucking). When the optical disk is ejected, the traverse chassis 21 (traverse unit 2) is lowered to a state where the optical disk is placed on the disk tray 1 (a state where the optical disk and a turntable described later are separated).

The optical head 3 reads or records data by irradiating an optical disk with laser light, and is attached so as to slide along a guide shaft 211 provided in the traverse chassis 21. An objective lens 31 for irradiating the optical disk with laser light is provided. Although not shown, optical components such as a laser light source that emits laser light and a light receiving element that receives the laser light reflected by the optical disk and converts it into an electrical signal are arranged.

The optical head 4 is provided with a rack 42 to which a driving force of a driving motor 9 described later is transmitted. The rack 42 has a main rack 421 formed integrally with the optical head 3 at the bottom,
And a sub-rack 422 disposed on the upper portion so as to overlap the main rack 421.
That is, the rack 42 is a dull black in which the main rack 421 and the sub-rack 422 overlap.

The main rack 421 meshes with a first gear 71 described later, and receives the driving force of the driving motor 9 to slide the optical head 4. The subrack 422 is slidably attached to the main rack 421, and the main rack 421 and the subrack 422 are urged by a coil spring so that the gear teeth are displaced in plan view. Main rack 421 and subrack 42
By shifting the second gear teeth as described above, the gear teeth of the first gear 71 are sandwiched, so that backlash can be removed.

In the rack 42, the gear teeth of the subrack 422 are formed longer than the gear teeth of the main rack 421, and the gear teeth of the subrack 422 are overlapped so as to be longer on the rear side than the gear teeth of the main rack 421. Be placed. Thereby, depending on the position of the optical head 4, the main rack 421 and the subrack 422 are in mesh with the first gear 71.
In some cases, only the first gear 71 is meshed with each other, and neither the main rack 421 nor the sub-rack 422 is meshed with the first gear 71.

Also, as shown in FIG. 4, on the opposite side of the subrack 421 where the gear teeth are formed, a portal-shaped elastic member (in contact with the protrusion 22 formed on the traverse chassis 21)
A leaf spring 43) is provided. The leaf spring 43 is formed integrally with the fixed portion at the center of the support portion 432 and a pair of fixed portions 431 fixed to the sub-rack 422, a support portion 432 connecting the pair of fixed portions 431, and abuts against the protruding portion 22. And a mountain-shaped portion 433. Also. A rack boss 423 that is slidably engaged with a trigger guide 51 of a lever trigger 5 described later is formed (standing) at the tip of the subrack 432.

When the optical head 4 slides toward the inner peripheral side of the optical disk and reaches the limit of movement of the optical head 4, the engagement between the main rack 421 and the first gear 71 is disengaged, and the sliding of the optical head 4 stops. . At this time, the sub-rack 422 is still in mesh with the first gear 71, and the sub-rack 422 further slides toward the inner peripheral side of the optical disc, and is formed on the mountain-shaped portion 433 of the leaf spring 43 and the traverse chassis 21. The protruding portion 22 is in contact. When the leaf spring 43 comes into contact with the protrusion 22 with a certain force or less (the sliding force of the sub-rack 422 is small), the mountain-shaped portion 433 comes into contact with the protrusion 22 and cannot stop and stops. Further, the plate spring 43 is deformed when it comes into contact with the protrusion 22 with a certain force or more (the sliding force of the sub-rack 422 is large), and the mountain-shaped portion 433 is formed so as to get over the protrusion 22.

The lever trigger 5 includes a trigger guide 51 (see FIG. 3) with which the rack boss 423 is engaged, and a connecting boss 52 (see FIGS. 4 and 5) to be fitted into a connecting groove 341 of the cam slider 34 described later.
And have. The lever trigger 5 is attached to the traverse chassis 21 so as to reciprocate in the side direction (direction perpendicular to the moving direction of the disc tray 1) according to the position (moving) of the rack boss 423. The lever trigger 5 moves in the side direction when the subrack 422 slides and the rack boss 423 presses the side of the trigger guide 51.
At this time, the connecting boss 52 pushes the connecting groove 341 of the cam slider 4, and the cam slider 34
Move.

The spindle motor 6 has a turntable 61 for supporting the optical disk,
When the traverse unit 2 is raised, the turntable 61 is fitted (chucked) with the clamp 32 (see FIG. 2) provided in the loader chassis unit 3 by magnetic force. At this time, the clamp 32 and the turntable 61 are attracted to each other by magnetic force, and strongly hold the optical disk. The spindle motor 6 is a motor that rotates the chucked optical disk. The raising / lowering operation of the traverse unit 2 on which the spindle motor 6 is mounted for chucking (for disk reproduction or the like) will be described later.

The traverse chassis 21 includes a sliding boss 2 that engages with a cam groove 343 of the cam slider 34.
The traverse chassis 21 is moved up and down in conjunction with the movement of the cam slider 34.

The driving force transmission gear mechanism 7 includes a first gear 71, a second gear 72, and a third gear 73.
Each gear is rotatably supported by the traverse chassis 21. Driving force transmission gear mechanism 7
Is the driving force from the driving motor 9 provided in the loader chassis unit 2 (see FIG. 6),
Transmission is performed for reciprocal movement of the disk tray 1, reciprocal movement of the optical head 4, and movement of the cam slider 34.

The first gear 71 is a pinion gear 9 attached to an output shaft 90 (described later) of the drive motor 9.
1 (described later), the first large gear 711 to which the driving force is transmitted, and the same central axis as that of the first large gear 711, provided below (in the direction approaching the loader chassis 31), and the rack 4 of the optical head 4.
2 and a first small gear 712 for transmitting a driving force. That is, the first large gear 711 is pivotally supported upward and the first small gear 712 is coaxially supported downward.

The second gear 72 is provided on the second central gear 721 to which the driving force from the first gear 71 is transmitted, on the same central axis as the second large gear 721, and in the lower part (direction close to the loader chassis 31). And a second small gear 722 that transmits a driving force to the third gear 73. That is, the second large gear 721 is pivotally supported on the upper side and the second small gear 722 is pivotally supported on the lower side.

The third gear 73 is a gear to which a driving force is transmitted from the second small gear 722, and is pivotally supported on the traverse chassis 21.

The encoder 8 reads the slits of the slit plate 81 provided on the output shaft 90 of the drive motor 9 to obtain rotation information (rotation speed, rotation angle, rotation speed, etc.) of the pinion gear 91 provided on the output shaft 90. be able to.

More specifically, as shown in FIG. 7 (a plan view of a drive motor including an encoder) and FIG. 8 (a side view of the drive motor including an encoder), the encoder 8 is a printed circuit board 82 attached to the traverse chassis 21. And a detection section 83 having a concave cross section attached to the printed circuit board 82. In the encoder 8, a light emitting element 831 that emits light is provided at one end of the detection unit 83, and a light receiving element 832 is provided at multiple ends. The light emitting element 831 and the light receiving element 832 are arranged to face each other, and the slit plate 81 is arranged so as not to contact between the light emitting element 831 and the light receiving element 832. In the slit plate 81, through-hole shaped slits 811 are arranged at equal central angular intervals.

When the slit 811 is on the line connecting the light emitting element 831 and the light receiving element 832, the light receiving element 832 receives light from the light emitting element 831 and outputs an electrical signal. In addition, the slit 81
When 1 is not on the line connecting the light emitting element 831 and the light receiving element 832, the light receiving element 832 cannot receive the light emitted from the light emitting element 831, and an electric signal is not output. When the slit plate 81 is rotated while emitting light from the light emitting element 831, the slit plate 81 rotates in accordance with the rotation of the drive motor 9, so that an electrical signal (encoder pulse) is periodically output from the light receiving element 832, The rotation speed (that is, the rotation angle) of the drive motor 9 can be detected by the cycle of the electric signal.
<About loader chassis unit>
As shown in FIGS. 2 and 3, the loader chassis unit 3 includes a loader chassis 31,
A gear tray 33, a drive motor 9, and a cam slider 34 are provided. The loader chassis 31 is a main body chassis that houses the traverse unit 2, and is configured to include the drive motor 9 and the cam slider 34.

The gear tray 33 is a gear to which a driving force is transmitted from the third gear 73 and is pivotally supported by the loader chassis 31 so as to be rotatable. The gear tray 33 is provided with a missing portion 331 (see FIG. 6) that is partially missing in the axial direction. When meshing with the third gear 73, when not meshing, the angle and the height of the traverse unit 2 are determined. Can be produced selectively.

The drive motor 9 is a power source for the sliding operation of the disk tray 1, the reciprocation of the optical head 4, and the reciprocation of the cam slider 34 (up and down movement of the traverse unit 2). A pinion gear 91 and a slit plate 81 are fitted on the output shaft 90 of the drive motor 9.
The pinion gear 91 and the slit plate 81 rotate together with the output shaft 90. The pinion gear 91 meshes with the first large gear 711.

The cam slider 34 includes a connection groove 341 (see FIG. 5) with which the connection boss 52 of the lever trigger 5 is engaged, and a standing boss 342 (FIGS. 3, 5) that engages with the guide groove 11 on the bottom surface of the disc tray 1.
Etc.), a cam groove 343 (see FIG. 5) that engages with the sliding boss 212 of the traverse chassis 21, and a cam slider rack 344 that meshes with the gear tray 33.

The cam slider 34 is disposed on the front side of the loader chassis 31 so as to be slidable in a direction orthogonal to the moving direction of the disc tray 1. In addition, the cam groove 343 includes an upper cam groove 3431 and a lower cam groove 3432 that are disposed in the vertical direction of the up-and-down movement of the traverse chassis 21 with the cam slider 34 disposed, and the upper cam groove 3431. And an inclined cam groove 3433 that connects the lower cam groove 3432. A sliding boss 212 of the traverse chassis 21 passes through the cam groove 343. If the sliding boss 212 moves so as to be positioned in the upper cam groove 3431, the traverse chassis 21 (traverse unit 2
) Rises and moves so as to be positioned in the lower cam groove 3432, the traverse chassis 21 (
The traverse unit 2) is lowered.

<About movement of each member>
Here, the movement of each member (the optical head 4, the traverse unit 2, and the disk tray 1) will be described with reference to FIGS. 1 to 12, particularly FIGS. 9 to 12. FIG. 9 to 12, “solid line” means mechanical fixation (for example, press-fitting, screwing, etc.), and “alternate line” means engagement by gear teeth. In addition, “double line” means engagement by a cam, and “broken line” means a disconnected relationship. The members contributing to the moving process and the switching process are hatched with dots.
<About movement of optical head (see Fig. 9)>
The movement of the optical head 4 in the optical disc apparatus A of the present invention will be described. For example, DV
When the reproduction of the optical disk such as D is finished and the optical disk is taken out from the optical disk apparatus A,
That is, consider the case where the disc tray 1 is opened.

First, the drive motor 9 rotates in the A1 direction (forward rotation direction), and the pinion gear 91 also rotates in the A1 direction along with the rotation. The first large gear 711 that meshes with the pinion gear 91.
Rotates in the B1 direction. Then, the first small gear 712 that is connected to (connected to) the first large gear 711 also rotates in the B1 direction, and the rack 42 that meshes with the first small gear 712 (
The main rack 421 and the subrack 422) move in the C1 direction. The optical head 4 to which the rack 42 is attached also moves in the C1 direction.

The pinion gear 91 and the first large gear 711, the first small gear 712 and the second large gear 721, the second small gear 722 and the third gear 73 are always meshed, and the second small gear 722 and the third gear are engaged. The driving force from the driving motor 9 is always transmitted to 73. However, when the optical head 4 is moved, the third gear 73 is positioned at the intermittent portion 331 of the gear tray 33 (
(See FIG. 6). Therefore, the driving force is not transmitted to the gear tray 33 via the third gear 73, and the traverse unit 2 and the disc tray 1 do not move.
<Switching of optical disk movement to traverse unit movement (see FIG. 10)>
When the optical head 4 reaches a predetermined position on the inner peripheral side, the mountain-shaped portion 433 of the leaf spring 43 provided on the sub-rack 422 of the optical head 4 and the projection 22 provided on the traverse chassis 21 come into contact with each other. The movement of the head 4 stops. At this time, the main rack 421 of the rack 42 and the first rack
The meshing with the small gear 712 is disengaged. When the drive motor 9 increases the driving force in this state, the sub-rack 422 is engaged with the first small gear 712, so that the leaf spring 43 is deformed and the chevron 433.
Gets over the protrusion 22 and the sub-rack 422 further moves to the inner peripheral side.

When the subrack 422 further moves to the inner peripheral side, the rack boss 423 provided on the subrack 422 comes to be fitted into the trigger guide 51 of the lever trigger 5 and further moves in the C1 direction. As the subrack 422 moves in the C1 direction, the lever trigger 5 moves to D
Move in one direction. When the lever trigger 5 further moves, the rack boss 423 is locked (locked) to the end portion of the trigger guide 51. That is, the main rack 421 and the first small gear 712 are disengaged, and then the sub-rack 422 is further moved to the inner peripheral side, and the rack 42 and the first small gear 712 are disengaged and stopped. .
<About the traverse unit movement (descent) (see Fig. 11)>
On the other hand, the lever boss 5 that moves in the direction D <b> 1 in conjunction with the movement of the subrack 422 is provided with a connection boss 52, and the connection boss 52 passes through the connection groove 341 of the cam slider 34. Therefore, when the lever trigger 5 moves in the E1 direction, the cam slider 34 slides slightly in the E1 direction in conjunction with the lever trigger 5. Then, the cam slider rack 344 of the cam slider 34 also moves in the E1 direction, and the cam slider rack 344 meshes with the gear tray 33.

When the cam slider rack 34 moves in the E1 direction, the gear tray 33 engaged with the cam slider rack 344 rotates in the F1 direction. Then, the position of the intermittent portion 331 provided on the gear tray 33 changes (see FIG. 6) and meshes with the third gear 73. When the gear tray 33 meshes with the third gear 73, the driving force of the drive motor 9 is transmitted to the gear tray 33, and is transmitted to the cam slider rack 344 that meshes with the gear tray 33 and eventually the cam slider 34.

The cam slider 34 is further moved in the E1 direction by the driving force of the driving motor 9.
A sliding boss 212 of the traverse chassis 21 passes through the cam groove 343 of the cam slider 34, and the sliding boss 212 is moved to the lower cam groove 3432 in conjunction with the movement of the cam slider 34.
The inclined cam groove 3433 and the upper cam groove 3431 move in this order. Then, as the sliding boss 212 moves, the traverse chassis 21 descends in the G1 direction. As a result, the traverse chassis 21 and eventually the traverse unit 2 are lowered. As the traverse unit 2 descends, the driving force transmission gear mechanism 7 provided in the traverse unit 2, particularly the third gear 73, moves downward, so the third gear 73 moves below the intermittent portion 331 of the gear tray 33. And
The third gear 73 and the gear tray 33 are always meshed.
<Switching from traverse unit movement to disc tray movement (see FIG. 12)>
When the traverse unit 2 descends and the drive motor 9 further rotates, the cam slider 3
4 slides further in the E1 direction. Then, the standing boss 342 that engages with the guide groove 11 of the disc tray 1 also moves in the E1 direction. Then, the standing boss 342 comes to be positioned on the skewed portion 112 of the guide groove 11 that is bent stepwise. Therefore, the standing boss 342
In conjunction with the movement, the disc tray 1 moves in the H1 direction (front direction).

When the disc tray 1 is pushed by the standing boss 342 and moves in the H1 direction, the tray rack 1
2 also moves simultaneously and meshes with the gear tray 33. At the same time that the tray rack 12 and the gear tray 33 are engaged, the engagement between the cam slider rack 344 and the gear tray 33 of the cam slider 34 is released.
<About moving the disc tray (opening the tray) (see FIG. 12)>
When the tray rack 12 and the gear tray 33 mesh with each other, the tray rack 12 also moves in the H1 direction as the gear tray 33 rotates in the F1 direction. That is, the disc tray 1 moves to the front side, and the disc tray 1 passes through the slit-shaped entrance / exit St of the front panel Fp.
Is discharged.

As described above, in the disk apparatus A, the optical head 4,
The traverse unit 2 and the disc tray 1 can be operated. In addition,
In the above example, a series of operations related to the movement of the optical head 4 to the inner periphery, the lowering of the traverse unit 2 and the opening of the disk tray 1 have been described. However, the drive motor 9 is moved in the A2 direction (reverse rotation: see FIG. 3). By rotating, each part rotates or moves in the B2-H2 direction opposite to the B1-H1 direction. Thereby, the movement of the optical head 4 to the outer periphery, the raising of the traverse unit 2 and the closing of the disk tray 1 are also possible.
<About encoder control>
When opening the disc tray 1, as described above, the optical head 4 is moved to the inner peripheral side, the traverse unit 2 is lowered, and the disc tray 1 is ejected. The driving force (torque) from the driving motor 9 may be small for the movement of the optical head 4, and a large driving force is required for lowering the traverse unit 2 and discharging the disc tray 1. Further, when the optical disk is ejected from the reproduction state, chucking by the magnetic force between the clamp 32 of the loader chassis unit 3 and the turntable 61 of the traverse unit 2 must be removed, and the traverse unit 2 is lowered and the disc tray 1 is removed. A driving force larger than that required for discharging is required.

Therefore, the driving force is switched using the leaf spring 43 attached to the optical head 4, the protrusion 22 attached to the traverse chassis 21, and the encoder 8. FIG. 13A is a graph of encoder pulses and the voltage applied to the drive motor when the disk tray of the optical disk apparatus according to the present invention is ejected. FIGS. 13B, 13C, and 13D are leaf springs. And the schematic of the arrangement | positioning state of a projection part is shown.

First, the optical head 4 is moved. At this time, the driving force (driving torque) from the driving motor 9
May be small, and is driven by a low voltage V1 (see FIG. 13A). At this time, the slit plate 81 attached to the drive motor 9 rotates, and accordingly, an encoder pulse in which the voltage of the signal output from the encoder 8 changes is output. When the optical head 4 is moving, the drive motor 9 rotates at a constant speed, and encoder pulses with a constant period are output. At this time, the voltage V <b> 1 applied to the drive motor 9 is a voltage that can move the optical head 4 and outputs a driving force that the mountain-shaped portion 433 of the leaf spring 43 cannot get over the protruding portion 22. .

When the optical head 4 reaches the inner peripheral side and the mountain-shaped portion 433 of the leaf spring 43 and the projection 22 of the traverse chassis 21 come into contact with each other (FIG. 13A), the mountain-shaped portion 433 gets over the projection 22. As a result, the optical head 4 stops. At this time, the sub-rack 422 of the optical head 4 is the first
The small gear 712 meshes with the driving force transmission gear mechanism 7 and the driving motor 9. When the drive motor 9 stops, the signal from the encoder 8 does not change.

When it is confirmed that the signal from the encoder 8 does not change, a voltage V2 for obtaining a driving force for eliminating chucking due to the magnetic force between the clamp 32 and the turntable 61 is applied to the driving motor 9. At this time, the sub-rack 422 moves slightly, and the mountain-shaped portion 433 of the leaf spring 43 gets over the protruding portion 22 (FIGS. 13B and 13C).

The encoder pulse output from the encoder 8 is read with the voltage V2 applied.
When the encoder pulse reaches a certain number of pulses (here, 4 pulses), it is considered that chucking has come off, and the voltage applied to the drive motor 9 is lowered to V3. This voltage V3 is a voltage for lowering the traverse unit 2 and outputting a driving force necessary to eject the disc tray 1 after the traverse unit 2 is lowered.

FIG. 14 shows a graph of encoder pulses and voltages applied to the drive motor when the disc tray of the optical disc apparatus according to the present invention is inserted.

When an optical disk is placed on the disk tray 1 and the insertion operation of the disk tray 1 is started, a voltage V4 having a polarity opposite to that of the ejection operation is applied to the drive motor 9. When the voltage V4 is applied, the driving force output from the driving motor 9 is transmitted by the driving force transmission gear mechanism 7 to move the tray rack 12 and move the disc tray 1 in the insertion direction. After that, the disc tray 1
Is inserted as far as it will go and the disc tray 1 stops. At the same time, traverse unit 2
Rises, the optical disk is lifted by the turntable 61, and the optical disk is chucked by the clamp 32 of the loader chassis unit 3 and magnetic force. When the traverse unit 2 finishes rising, the optical head 4 starts moving.

At this time, the driving force for raising the traverse unit 2 and the driving force for moving the optical head 4 are different from each other, and an encoder pulse output from the encoder 8 when a constant voltage is applied to the drive motor 9. There is a difference in frequency. That is, when the traverse unit 2 is moved up to the movement of the optical head 4, the load applied to the drive motor 9 is reduced, so that the rotational speed of the drive motor 9 is increased and the frequency of the encoder pulse is increased. When it is detected that the frequency of the encoder pulse is increased, the disc tray 1 is inserted, the traverse unit 2 is raised and the optical disc is chucked, and the supply of power to the drive motor 9 is terminated.

Further, as shown in FIG. 15, for confirming the operation of the optical head 4, when the frequency increases, the voltage applied to the drive motor 9 is lowered to V5 so that the optical head 4 reaches the outer end. May be. At this time, when the optical head 4 reaches the outer peripheral end, the traverse chassis 2
And the optical head 4 abuts and the optical head 4 stops. When the optical head 4 is stopped, the rotation of the drive motor 9 is also stopped and the signal from the encoder 8 is not changed. When it is detected that the change in this signal has disappeared, the supply of power to the drive motor 9 is stopped.

FIG. 16A shows the optical head of the optical disc apparatus according to the present invention from an arbitrary position to an initial position (
Graphs of the encoder pulse and the voltage applied to the drive motor when moving to the home position) are shown, and FIGS. 16B, 16C, and 16D are schematic views showing the arrangement state of the leaf springs and the protrusions.

For example, when the disc tray 1 is inserted and the optical disc is loaded, the optical head 4 moves to a predetermined home position on the inner periphery of the optical disc to detect the start track of the optical disc, and irradiates the optical disc with laser light. Read information and write information to optical disc.

First, in order to grasp the current position of the optical head 4, one end moves toward the inner periphery side (FIG. 16A).
At this time, the voltage V6 applied to the drive motor 9 can move the optical head 4, and the traverse chassis 21 includes the mountain-shaped portion 433 of the leaf spring 43 provided in the optical head 4. This is a voltage that outputs a driving force that cannot get over the protruding portion 22. At this time, encoder pulses are output from the encoder 8 at a constant cycle.

When the optical head 4 reaches the inner peripheral side and the mountain-shaped portion 433 of the leaf spring 43 and the projection 22 of the traverse chassis 21 come into contact with each other (FIG. 16B), the mountain-shaped portion 433 gets over the projection 22. Therefore, the optical head 4 stops, and the driving force transmission gear mechanism 7 and the driving motor 9 also stop. When the drive motor 9 stops, the signal from the encoder 8 does not change. Encoder 8
When a state in which the signal from is not changed is detected, a voltage V7 for reversely rotating the drive motor 9 is applied next. The rotation of the drive motor 9 is transmitted by each gear of the drive force transmission gear mechanism 7, and the amount of movement of the optical head 4 can be determined by the rotation angle of the drive motor 9 (FIG. 16C). ). That is, when the number of encoder pulses output from the encoder 8 reaches a predetermined number (here, 3 pulses), the application of the voltage to the drive motor 9 is terminated.

In each of the above control examples, the amount of movement of the optical head 4 and the timing of releasing the chucking of the traverse unit 2 are detected by measuring the number of encoder pulses, and the voltage applied to the drive motor 9 is switched. Instead of this, a device such as a timer that can measure the time may be provided, and the voltage may be switched after a predetermined time has elapsed.

By performing such encoder control, the operation of the optical head 4, the operation of the traverse unit 2, and the operation of the disc tray 1 can be performed as a smooth continuous operation. In addition, since optimum power can be supplied to the drive motor 9 in accordance with the operation state of each member, useless power is not consumed, and the drive motor 9 is not loaded more than necessary. Therefore, it is possible to save energy and extend the life of each member.

In the above embodiment, a leaf spring having a gate shape is cited as the elastic member, but the elastic member is not limited thereto, and a wide variety of elastic members capable of exhibiting a predetermined elastic force can be used for the protrusions provided in the traverse chassis. Can do.

The present invention can be applied to an optical disc apparatus using an optical disc such as a DVD or CD as a recording medium.

1 is a perspective view of an optical disc apparatus according to the present invention. 1 is a schematic plan view of the inside of an optical disc apparatus according to the present invention. FIG. 3 is a schematic configuration diagram in which a loader chassis and a disc tray are omitted from the optical disc apparatus shown in FIG. 2. It is a schematic block diagram inside an optical disk device seen from below. It is a schematic block diagram inside the optical disk device seen from the front panel side. It is a schematic block diagram inside an optical disc device seen from the side. It is the schematic of the encoder seen from the upper part. It is the schematic seen from the side of the encoder shown in FIG. It is a block diagram explaining the movement of an optical head. It is a block diagram explaining switching from the movement of an optical head to the movement of a traverse unit. It is a block diagram explaining the movement of a traverse unit. It is a block diagram explaining switching from the movement of a traverse unit to the movement of a disc tray. FIG. 5A is a graph of the voltage applied to the drive pulse and the encoder pulse when the disk tray of the optical disk apparatus according to the present invention is ejected, and FIGS. It is the schematic of a state. 6 is a graph of an encoder pulse and a voltage applied to a drive motor when a disc tray of the optical disc apparatus according to the present invention is inserted. 6 is a graph of an encoder pulse and a voltage applied to a drive motor when a disc tray of the optical disc apparatus according to the present invention is inserted. FIG. (A) is a graph of the voltage applied to the encoder pulse and the drive motor when the optical head of the optical disk apparatus according to the present invention moves from an arbitrary position to the initial position (home position). (D) is the schematic of the arrangement | positioning state of the leaf | plate spring and projection part at that time.

Explanation of symbols

A optical disc apparatus 1 disc tray 11 guide groove 12 tray rack 2 traverse unit 21 traverse chassis 22 projection 3 loader chassis unit 31 loader chassis 32 clamp 33 gear tray 34 cam slider 4 optical head 41 objective lens 42 rack 43 leaf spring 5 lever trigger 51 Trigger guide 52 Connecting boss 6 Spindle motor 61 Turntable 7 Driving force transmission gear mechanism 71 First gear 72 Second gear 73 Third gear 8 Encoder 81 Slit plate 82 Printed circuit board 83 Detection unit 9 Drive motor 90 Drive shaft 91 Pinion gear

Claims (7)

A drive motor as a power source;
A disc tray that is slidably opened and closed with respect to the optical disc apparatus main body, includes a tray rack for receiving the driving force of the drive motor, and a guide groove as an interlocking mechanism, and a disc tray on which an optical disc can be placed ,
The optical disc is irradiated with a laser beam and reciprocally slidable to the inner or outer circumference of the optical disc. The optical disc includes a rack having a rack boss and receiving a driving force of the drive motor. Optical head,
A spindle motor that is provided so as to be movable up and down, has a sliding boss for receiving the driving force of the drive motor, and is rotatably attached to the spindle motor and the spindle motor for rotating the optical disk. A traverse chassis on which a turntable for supporting the rack is mounted; a trigger guide that engages with a rack boss of the rack; and a lever trigger that interlocks with the movement of the optical head and has a connecting boss; and the driving force of the drive motor A traverse unit including a driving force transmission gear mechanism for transmitting the optical head, to which the optical head is slidably mounted;
The drive motor is mounted and the drive force transmission gear mechanism is engaged to receive the drive force of the drive motor, while the engagement with the drive force transmission gear mechanism is eliminated so that the drive force is not transmitted. A cam tray that pivotally supports a gear tray having an intermittent portion for rotating, further includes a cam slider rack that meshes with the gear tray, and a cam groove that engages a sliding boss of the traverse chassis, the disk A cam slider that is provided with a standing boss that engages with a guide groove of the tray and a connection groove that engages with a connection boss of the lever trigger, and that interlocks the traverse chassis and the disk tray, while interlocking with the movement of the lever trigger; ,
An optical disc apparatus including a loader chassis unit including a clamp for chucking the optical disc when the traverse unit is raised;
The drive motor is provided with an encoder that outputs an encoder pulse for detecting the number of rotations in forward and reverse rotation drive,
The optical head rack is provided with a leaf spring, and the traverse unit is provided with a protrusion that contacts the leaf spring when the optical head moves to the inner peripheral side of the optical disk.
The leaf spring includes a pair of fixed portions, a support portion that connects the pair of fixed portions, and a mountain-shaped portion that is formed substantially at the center of the support portion. When the driving force of the driving motor reaches a predetermined position, the chevron portion and the protrusion come into contact with each other, and when the driving force received from the driving motor is small, the chevron portion is It is formed so that it cannot exceed the protrusion,
When the traverse unit descends, the optical head moves to a position where the mountain-shaped portion exceeds the protrusion and does not receive a driving force from the driving motor,
The optical head slides, the chevron and the projection contact each other, the rotation of the drive motor stops, and the amplitude of the encoder pulse output from the encoder does not change for a certain period, or the encoder An optical disc apparatus characterized in that the driving force output from the drive motor is switched based on a change in pulse frequency. A slidable disc tray on which an optical disc is placed;
A slidable optical head for irradiating the optical disk with laser light;
A traverse unit that can be moved up and down and mounted with a turntable that supports the optical head and the optical disc;
A drive motor serving as a power source for sliding the disk tray, sliding the optical head, and raising and lowering the traverse unit;
An optical disc apparatus comprising: the traverse unit; and a loader chassis unit that supports the drive motor and includes the turntable and a clamp that clamps and chucks the optical disc when the traverse unit is raised. ,
The drive motor is provided with an encoder that outputs an encoder pulse for detecting the number of rotations in forward and reverse rotation drive,
The optical head rack includes an elastic member, and the traverse unit includes a protrusion that contacts the elastic member when the optical head moves to the inner peripheral side of the optical disc.
When the optical head reaches a predetermined position where the optical head can receive the driving force of the driving motor on the inner peripheral side, the mountain-shaped portion and the protruding portion come into contact with each other from the driving motor. When the driving force received is small, the chevron portion is formed so as not to exceed the protruding portion, and when the traverse unit is lowered, the chevron portion exceeds the projecting portion when the traverse unit is lowered, and the driving It moves to a position where it does not receive the driving force from the motor,
An optical disc apparatus characterized by detecting a change in an encoder pulse output from the encoder when the leaf spring comes into contact with the protrusion and stops the optical head, and switches a driving force output from the driving motor. When the optical disk unit is moved to the inner peripheral side of the optical disk, the traverse unit is lowered, and the disk tray is ejected, the optical head can be slid and the leaf spring can get over the protrusion. When a first voltage capable of outputting a driving force that cannot be output is input to the drive motor and it is detected that the amplitude of the encoder pulse output from the encoder has stopped changing, the chucking between the turntable and the clamp is performed. A second voltage capable of exhibiting a driving force for eliminating the second driving voltage is input to the driving motor;
A third voltage capable of outputting a driving force capable of driving the disc tray is input to the drive motor at a predetermined switching timing after starting to input a voltage to the drive motor. The optical disc device according to claim 1 or 2. When the optical head is moved to the inner peripheral side and moved to a predetermined home position, the optical head can be slid and a driving force that can prevent the leaf spring from getting over the protrusion is output. When a voltage is input to the drive motor and it is detected that the amplitude of the encoder pulse output from the encoder has stopped changing, a fourth voltage capable of moving the optical head in the outer circumferential direction is input to the drive motor. 4. The optical disc apparatus according to claim 1, wherein the input voltage is set to 0 at a predetermined switching timing. When the disc tray is inserted into the optical disc apparatus, the drive motor inputs a fifth voltage that can drive the disc tray and can output a driving force for raising the traverse unit. When it is detected that the frequency of the output encoder pulse has increased, the optical head can be moved in the outer circumferential direction, and a sixth voltage at which the frequency of the encoder pulse becomes a predetermined value is input to the drive motor. An optical disc apparatus according to any one of claims 1 to 4. 6. The optical disc apparatus according to claim 3, wherein the switching timing is determined based on the passage of time. 6. The optical disc apparatus according to claim 3, wherein the switching timing is determined based on the number of encoder pulses output from the encoder.

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