JP2012243356A - Optical disk drive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk drive in which an opening part of a disk tray is narrow by preventing guide shafts from coming off while avoiding interference in the drive.SOLUTION: In the optical disk drive including a traverse chassis with an optical pickup unit and guide shafts 31, 31 for supporting the optical pickup unit movably in the radial direction of an optical disk, a lever arm for supporting the traverse chassis in a vertically movable manner, a cam slider cam-engaged with the lever arm to move in a direction almost perpendicular to the movement direction of the lever arm, moving the lever arm vertically, and a disk tray 22 having a small diameter optical disk accommodation recessed part 22b and an opening 22c for allowing the optical pickup unit to come up from below to convey the optical disk, a rib 22d where the traverse chassis approaches one end of the guide shafts 31, 31 in a rising state is provided at a front edge of the opening 22c of the disk tray 22.

Description

  The present invention relates to an optical disc apparatus that performs recording / reproduction with respect to a CD, DVD, BD (Blu-ray Disc) or the like.

  Conventionally, as an optical disk apparatus, a disk tray on which an optical disk is placed is moved into the apparatus main body, the optical disk is clamped between a disk holder (clamper) provided in the apparatus main body and a turntable, and recorded on the optical disk. What is made to perform reproduction is known. In recent years, various improvements of the disk loading mechanism of this optical disk apparatus have been proposed.

  For example, Patent Document 1 discloses an optical disk apparatus in which a stopper rib for stopping a falling portion of a small-diameter optical disk partially falling into an opening of a tray is formed on the back side of the tray along at least one side edge of the opening. Or, it is an optical disk device in which a push-back projection for pushing back the small-diameter optical disk relatively with the insertion of the tray while stopping the falling part of the small-diameter optical disk is formed on the upper surface of the cam slider or the front end of the main chassis, It is disclosed that an optical disc apparatus in which both a stop rib and a push-back projection are formed is disclosed.

  In Patent Document 2, an end face abutting piece formed by cutting and raising the chassis plate is brought into contact with the end face of the guide shaft to constitute an axial retaining means for the guide shaft, and the chassis plate is cut and raised to form a bowl shape. The formed shaft holder holds the guide shaft that passes through the notch, and the adjustment screw that is screwed into the screw hole from the lower surface side of the chassis plate and protrudes upward comes into contact with the guide shaft. Thus, an optical disc drive having a guide shaft holding mechanism for preventing the guide shaft from being detached from the mounting opening and adjusting the height is disclosed.

  In Patent Document 3, a spindle motor with a turntable is provided at the front of a metal plate chassis, and an optical pickup is disposed in the central hole of the chassis, and a pair of left and right guide shafts movably supports the optical pickup. The end of each is engaged with four support members on the chassis, and a torsion coil spring is engaged between the end of each guide shaft and the chassis, and the chassis resists each torsion coil spring. The tip of the height adjustment screw screwed into the screw hole is pressed against the end portion of each guide shaft, and the four support members cause the portion left uncut when the chassis is press-molded to bend as appropriate. A disk device integrally formed with the chassis is disclosed.

  Further, Patent Document 4 includes a disc holder held by a holder clamp mechanism incorporated in a disc tray in the center of a disc loading portion of the disc tray, and the disc holder is held in the holder clamp mechanism in an unloaded state. A disc device is disclosed in which the holding by the holder clamp mechanism of the disc holder is released in the loading state while maintaining.

JP 2007-234186 A JP 2007-66430 A JP 2005-332531 A JP 2003-223755 A

  In such various improvements, when a small-diameter optical disk is placed out of the specified position of the disk tray, the small-diameter optical disk may fall into the apparatus from the opening of the disk tray when the disk is loaded. However, it is difficult to narrow the opening of the disc tray because interference with the mechanism around the optical pickup device must be avoided.

  It is an object of the present invention to provide an optical disc apparatus that prevents the guide shaft from coming off and narrows the opening of the disc tray while avoiding interference in the apparatus.

  To achieve the above object, the present invention provides a traverse chassis on which an optical pickup unit, a guide shaft that supports the optical pickup unit so as to be movable in the radial direction of the optical disk, and supports the traverse chassis so as to be movable up and down. A lever arm, a cam slider engaged with the lever arm, moved in a direction substantially perpendicular to the moving direction of the lever arm to move the lever arm up and down, a small-diameter optical disc housing recess, and the optical pickup unit. And a disc tray for conveying an optical disc, wherein the traverse chassis is in a raised state at one end of the guide shaft in an ascending state. It is characterized by providing adjacent ribs.

  According to this configuration, the rib serves to prevent the guide shaft from coming off, and when an external impact is applied when the traverse chassis is in the ascending state, the guide shaft does not come into contact with the rib even if it moves forward and falls off. .

  In the above optical disk apparatus, it is preferable that the cam slider is provided with a protrusion that is close to one end of the guide shaft when the traverse chassis is in the lowered state.

  According to this configuration, the projection serves to prevent the guide shaft from coming off, and when an external impact is applied when the traverse chassis is in the descending state, the guide shaft contacts the projection and does not fall off even if the guide shaft moves forward. .

  In the above optical disc apparatus, it is desirable that the rib and the protrusion are close to each other in a state where the disc tray is accommodated.

  According to this configuration, when an external impact is applied, the guide shaft can be prevented from coming off regardless of the position of the traverse chassis.

  According to the present invention, the front end of the opening of the disc tray is provided with a rib that is close to one end of the guide shaft when the traverse chassis is in the raised state, thereby eliminating the front end of the traverse chassis and avoiding interference in the apparatus. However, it functions as a guide for preventing the guide shaft from slipping forward, and the opening of the disc tray becomes narrow, making it difficult for the small-diameter optical disc to fall into the apparatus.

It is a block diagram which shows the structure of the optical disk apparatus of one Embodiment of this invention. It is a top view of the drive device of the optical disk device of one embodiment of the present invention. FIG. 3 is a diagram in which a disc tray is removed from FIG. 2. FIG. 4 is a sectional view taken along line AA in FIG. 3.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, embodiment shown here is an example and this invention is not limited to embodiment shown here.

  FIG. 1 is a block diagram showing the configuration of the optical disc apparatus of the present embodiment. The optical disc apparatus 1 can reproduce information on the optical disc 15 and record information on the optical disc 15. Reference numeral 2 denotes a spindle motor, and the optical disk 15 is detachably held by a chuck portion (turn table and clamper) provided on the upper portion of the spindle motor 2. Then, when recording / reproducing information on the optical disk 15, the spindle motor 2 continuously rotates the optical disk 15. The rotation control of the spindle motor 2 is performed by the spindle motor control unit 3.

  Reference numeral 4 denotes an optical pickup unit (OPU) that irradiates the optical disk 15 with a light beam emitted from a light source, thereby enabling writing of information on the optical disk 15 and reading of information recorded on the optical disk 15.

  The signal processing unit 8 includes at least an RF signal processing unit 9, a track error signal processing unit 10, and a focus error signal processing unit 11. The signal processing unit 8 generates an RF signal, a track error signal (TE signal), and a focus error signal (FE signal) based on the electrical signal converted by the photodetector (not shown). The RF signal is demodulated into data by the data demodulator 12.

  The TE signal and the FE signal are output to the actuator control unit 7. Based on these signals, the actuator controller 7 supplies a drive signal to an actuator (not shown) that can move the objective lens 21. The actuator to which the drive signal is supplied operates each part based on the signal to move the objective lens 21 in a direction parallel to the optical axis so that the focus follows the recording surface 15a of the optical disc 15 and the objective lens. Tracking control is performed so that the spot position of the light beam follows the track position formed on the optical disk 15 by moving 21 in a direction parallel to the radial direction of the optical disk 15.

  In addition, the laser control means 5 controls the laser output of a light source (not shown) composed of a semiconductor laser provided in the optical pickup 4. The overall control unit 13 controls the spindle motor control unit 3, the laser control unit 5, the beam expander control unit 6, the actuator control unit 7, the signal processing unit 8, the data demodulation unit 12, and the like to control the entire apparatus. Take control.

  2 is a plan view of the drive device of the optical disk apparatus 1 of the present embodiment, FIG. 3 is a view in which the disk tray is removed from FIG. 2, and FIG. 4 is a cross-sectional view taken along line AA in FIG. 2 to 4, members related to the optical pickup unit are omitted.

  The optical disk apparatus 1 accommodates a drive device 20 in a housing of an apparatus main body that forms an appearance. The drive device 20 swivels in a direction (vertical direction) substantially perpendicular to the loader chassis 21 that accommodates each member of the drive device 20, the disk tray 22 that conveys the optical disk, and the conveyance direction (front-rear direction) of the disk tray 22. A traverse assembly 23 that can be moved up and down, and a lever arm 24 that is substantially U-shaped in plan view and supports the traverse assembly 23 while covering a part of the lower surface of the traverse assembly 23 (in this embodiment, near the front end of the lower surface) and moves up and down. And a cam slider 25 that cam-engages with the front portion of the lever arm 24 and moves in the left-right direction (the direction in which the disc tray 22 is transported and the traverse assembly 23 is substantially perpendicular) to move the lever arm 24 up and down. And a motor (not shown) that drives the disc tray 22 and the cam slider 25 via a plurality of gears. It is equipped with a door.

  The traverse assembly 23 includes a traverse chassis 30 for mounting each member, an optical pickup unit (OPU) (not shown), and two guide shafts 31 that support the OPU so as to be movable in the radial direction (front-rear direction) of the optical disc. , 31, a stepping motor (not shown) for driving the OPU, a spindle motor 2 provided at a front portion of the upper surface of the traverse chassis 30, and a turntable 32 provided at an upper portion of the spindle motor 2. And.

  The traverse assembly 23 is locked to the lever arm 24 by the locking means 33 and 33 at the two front ends of the traverse chassis 30, and is locked to the loader chassis 21 by the locking means 34 and 34 at the two rear ends of the traverse chassis 30. Has been. The locking means 33 and 34 are rubber O-rings and screws.

  In the optical disk apparatus having the above-described configuration, when the optical disk is placed on the disk tray 22 in the drawn-out state, the disk tray 22 is conveyed into the optical disk apparatus 1 by driving the motor. When the disc tray 22 is arranged at a predetermined position, the transmission of the driving force of the motor to the disc tray 22 is released, the disc tray 22 is stopped, the cam slider 25 is moved by the driving of the motor, and the traverse assembly 23 is raised. Let Thereby, the traverse assembly 23 is engaged with the optical disc, and the optical disc is chucked.

  When the optical disk is chucked, the transmission of the driving force of the motor to the cam slider 25 is released, and the cam slider 25 and the traverse assembly 23 are stopped. Subsequently, the OPU moves to a predetermined position by driving the stepping motor, and recording or reproduction is performed on the optical disk. Further, when the optical disk is taken out, the reverse operation is performed.

  Next, characteristic components of the present invention will be described in detail. The disc tray 22 is formed with concentrically a large-diameter optical disc accommodating recess 22a having a concave shape for placing a 12 cm optical disc and a small-diameter optical disc accommodating recess 22b having a concave shape for placing an 8 cm optical disc. . Also, a substantially rectangular opening 22c is formed in the vicinity of the center of the disk tray 22 to allow the OPU and the turntable 32 to enter from below. Accordingly, the opening 22c needs to be shaped and sized so as not to interfere with the traverse assembly 23 when the traverse assembly 23 is raised and lowered.

  Further, a rib 22d is formed at the front end of the opening 22c of the disc tray 22 so as to face and approach one end (front end) of the guide shafts 31 and 31 when the traverse chassis 20 is in the raised state. That is, the rib 22d is integrally formed with the traverse chassis 20 and protrudes downward from the front end of the opening 22c of the disc tray 22 to the extent that it does not interfere with the traverse chassis 20. The rib 22d may be provided at a position facing at least the front ends of the guide shafts 31 and 31.

  The proximity of the rib 22d and the front ends of the guide shafts 31 and 31 means a state where the ribs 22d are close to each other so as not to interfere. Due to the proximity, the rib 22d serves to prevent the guide shafts 31 and 31 from coming off, and when an external impact is applied when the traverse chassis 20 is in the raised state, the guide shafts 31 and 31 are moved forward. Even if it moves, it abuts against the rib 22d and does not fall off. On the other hand, the rear ends of the guide shafts 31 and 31 cut and raise the traverse chassis 20 to prevent it from coming off.

  Conventionally, in order to prevent the guide shafts 31 and 31 from slipping forward, the traverse chassis 20 is cut and raised in the same manner as the rear end to prevent it from coming off. Therefore, the front end of the opening 22c is widened to the front of the cut and raised portion so that the front end of the opening 22c of the disc tray 22 does not interfere with the cut and raised portion.

  In the present embodiment, since the front end is not cut and raised, and the rib 22d is provided, there is no interference between the conventional cut and raised portion and the front end of the opening. Therefore, the front end of the opening 22c is equal to the thickness of the conventional cut and raised. Is retreating. Accordingly, the area of the opening 22c is reduced, and the area of the small-diameter optical disc housing recess 22b is increased.

  Therefore, even when a small-diameter optical disk is placed out of the specified position of the disk tray 22 (small-diameter optical disk housing recess 22b), the small-diameter optical disk is unlikely to fall into the apparatus from the opening 22c of the disk tray 22 during disk loading. In addition, from the viewpoint of ensuring the strength of the traverse chassis 20, the front end of the traverse chassis 20 may be bent downward.

  As described above, by providing the rib 22d on the disc tray 22, it functions as a retaining mechanism for the guide shafts 31 and 31 in place of the front end of the traverse chassis 20, and further, the opening 22c becomes narrow and the small-diameter optical disc. Is less likely to fall into the device.

  Further, in order to prevent the guide shafts 31 and 31 from falling off when the traverse chassis 20 is in the descending state, the traverse chassis 20 faces the one end (front end) of the guide shafts 31 and 31 in the descending state. Protrusions 25a and 25a that are close to each other are provided.

  The protrusion 25 a is a round or square bar-shaped member that protrudes from the rear surface of the cam slider 25 toward the front end of the guide shaft 31. The protrusion 25 a is integrally formed with the cam slider 25, and moves with the traverse chassis 20 by the movement of the guide shaft 31. It is designed not to interfere.

  The proximity of the protrusions 25a, 25a and the front ends of the guide shafts 31, 31 means a state where the protrusions 25a, 25a are close to each other so as not to interfere. Due to the proximity, the protrusions 25a and 25a serve to prevent the guide shafts 31 and 31 from coming off, and when an external impact is applied when the traverse chassis 20 is in the lowered state, the guide shafts 31 and 31 are Even if it moves forward, it abuts against the protrusions 25a and 25a and does not fall off.

  Further, in the state in which the disc tray 22 is accommodated, the rib 22d and the protrusion 25a are close to each other. The proximity of the rib 22d and the protrusion 25a refers to a state where the rib 22d and the protrusion 25a are close to each other so as not to interfere. As a result, the guide shafts 31 and 31 are always prevented from being detached by either the rib 22d or the protrusion 25a regardless of whether the traverse chassis 20 is in the ascending state or the descending state.

  Therefore, when an external impact is applied, the guide shafts 31 and 31 can be prevented from coming off regardless of the position of the traverse chassis 20.

  INDUSTRIAL APPLICABILITY The present invention can be used for an optical disc apparatus that performs recording / reproduction with respect to a CD, DVD, BD, etc., for example, a BD / DVD player, a BD / DVD recorder, a television integrated BD / DVD recorder, and a BD / DVD recording / reproducing apparatus. An on-board personal computer can be mentioned.

DESCRIPTION OF SYMBOLS 1 Optical disk apparatus 15 Optical disk 20 Traverse chassis 22 Disc tray 22b Small diameter optical disk accommodation recessed part 22c Opening part 22d Rib 24 Lever arm 25 Cam slider 25a Protrusion 31 Guide shaft

Claims (3)

A traverse chassis including an optical pickup unit and a guide shaft that supports the optical pickup unit so as to be movable in the radial direction of the optical disc;
A lever arm that supports the traverse chassis to be movable up and down;
A cam slider that cam-engages with the lever arm, moves in a direction substantially perpendicular to the moving direction of the lever arm, and moves the lever arm up and down;
In an optical disc apparatus comprising: a small-diameter optical disc housing recess; and an opening for allowing the optical pickup unit to enter from below, and a disc tray for transporting the optical disc.
2. An optical disk apparatus according to claim 1, wherein a rib is provided at a front end of the opening of the disk tray so as to be close to one end of the guide shaft when the traverse chassis is in an elevated state.   2. The optical disc apparatus according to claim 1, wherein the cam slider is provided with a protrusion that is close to one end of the guide shaft when the traverse chassis is in a lowered state.   3. The optical disc apparatus according to claim 2, wherein the rib and the protrusion are close to each other in a state where the disc tray is accommodated.

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