JP2009099236A - Optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that when no inner periphery detecting means is provided, disengaging noise between a projection type engaging part 53a and a feeding groove 57a of a nut member 53 may occur at an inner periphery position of an optical pickup 51, or it is necessary to reduce the rotation speed of a lead shaft 57 in order to prevent the noise. <P>SOLUTION: The projection type engaging part may not be disengaged from the feeding groove of the lead shaft even when rotation force of the lead shaft remains after the optical pickup is moved to the end by providing flexibility in the feed direction of the optical pickup by a U-shaped springy third part of a rack member 10 and only by providing a stopper rib at the chassis at the outside of the moving range of the projection type engaging part of the rack member moving the optical pickup, thereby causing no noise while maintaining the quality. Also, a means for detecting an inner periphery is not required without reducing the rotation speed of the lead shaft, so that cost can be reduced while keeping conventional quality. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optical disc apparatus capable of recording and reproducing information on a disc.

  2. Description of the Related Art In recent years, optical disc apparatuses that read and reproduce optical discs using optical pickups as optical recording media have been reduced in price, size, and performance, and CD players and recordable and reproducible DVD players have become popular. Yes.

  As for conventional optical disc apparatuses, those disclosed in Japanese Patent Application Nos. 8-281974 and 2005-79734 are disclosed. Hereinafter, a conventional optical disk apparatus will be described as an example.

  14 to 17 show a conventional optical disc apparatus. FIG. 14 is a perspective view of the entire optical disc apparatus as viewed from the front, FIG. 15 is a perspective view of the same as viewed from the back, FIG. 16 is an exploded perspective view of the components, and FIG. 17 is a partial sectional view of the components. .

  13 to 17, reference numeral 61 denotes a spindle motor that is fixed to the chassis 62 and rotates an optical disk (not shown), and 60 is a turntable on which the optical disk is placed, and is integrated with the spindle motor 61. 51 is an optical pickup that extracts information from the optical disk, 56 is a traverse motor that provides a driving force for moving the optical pickup 51, 57 is a lead shaft that is rotated by the driving force of the traverse motor 56, and 53 is a feed groove of the lead shaft 57. A rack member 54 having a projecting engagement portion 53 a that engages with 57 a is a pressing spring for preventing the rack member 53 from being detached from the lead shaft 57, and is attached to the rack member 53. The rack member 53 is fixed to the optical pickup 51 with screws 55. A main shaft 58 and a sub shaft 59 fixed to the chassis 62 penetrate both ends of the optical pickup 51. Reference numeral 51d denotes a base of the optical pickup 51. The protrusion 51e is configured to enter the photosensor 63 and detect the position when the optical pickup 51 is sent to the inner periphery of the optical disk.

  Next, a method of connecting the optical pickup 51 with the rack member 53 that transmits the driving force of the lead shaft 57 to the optical pickup 51 will be described. First, the holes 53 a and 53 b of the rack member 53 are fitted into the bosses 51 a and 51 b provided on the optical pickup 51 to position the nut plate 53. Similarly, the presser spring 54 is fitted into the bosses 53d and 53e of the rack member 53 for assembly. Next, the screw 55 is passed through the hole 53 c provided in the rack member 53 and screwed into the screw hole 51 c of the optical pickup 51 to fix the rack member 53 to the optical pickup 51. Further, the driving force of the lead shaft 57 is transmitted to the optical pickup 51 without the projection-like engaging portion 53 a being detached from the feed groove 57 a of the lead shaft 57 by pushing the rack member 53 toward the lead shaft 57 by the holding spring 54. Here, since the rack member 53 is engaged with the metal lead shaft 57, a hard resin that is not easily worn is used.

The operation of the conventional optical deck configured as described above will be described below.
First, the optical disk placed on the turntable 60 is rotated by the spindle motor 61. At that position, the optical pickup 51 reads the signal of the disk. When the disc has a VTOC (Volume Table of Contents) area in which the information is recorded and there is no optical pickup at that position, it engages with a lead shaft 57 that transmits the driving force of the optical pickup traverse motor 56 The optical pickup 51 for reading the optical disk signal by the rack member 53 is moved in a predetermined inner circumferential direction of the optical disk. When the end face 51e of the optical pickup 51 presses the push-in piece 63a of the switch 63, the optical pickup 51 reads the VTOC signal of the disc at that position, thereby recognizing the disc information and performing a reproducing operation. .

FIG. 17 is a partial cross-sectional view when the optical pickup 51 comes to the inner peripheral position. The optical pickup 51 detects that the photo sensor 63 is blocked by the protrusion 51e of the optical pickup 51, and stops the rotation of the lead shaft 57 of the traverse motor 56. At this inner peripheral position, the protruding engaging portion 53a of the rack member 53 stops in an engaged state with the feed groove 57a of the lead shaft 57.
Japanese Patent No. 3031264 JP 2006-260721 A

  As described above, in the optical disk apparatus, since there is an inner circumference detection switch of the optical pickup 51, it is detected that the optical pickup 51 has reached the inner circumference position, and the rotation of the lead shaft 57 of the traverse motor 56 is stopped. Can do.

  However, in order to reduce the cost, when the inner circumference detection switch such as the photo sensor 63 is abolished, when the optical disk is first turned on, the optical pickup 51 reads the VTOC area of the disk. The lead shaft 57 of the traverse motor 56 is rotated for a certain period of time and is forcibly sent to the inner peripheral direction via the protruding engagement portion 53a of the rack member 53. This fixed time setting allows for a time margin to be sent to the innermost peripheral position even when the optical pickup 51 is at the outermost peripheral position. Since the rotation of the lead shaft 57 is set for a fixed time, there is a time during which the lead shaft 57 is rotated after the optical pickup 51 is sent to the inner peripheral position after the first power-on. At this time, if the rotational force of the traverse motor 56 is strong, the protruding engaging portion 53a of the rack member 53 may be disengaged from the feed groove 57a of the lead shaft 57 as shown in FIG. At this time, since the projecting engagement portion 53a enters and exits the feed groove 57a, noise may be generated and quality may be impaired. Alternatively, in order to prevent this disengagement, it is necessary to set the rotational force of the traverse motor 56 low. In this case, it takes time to send the optical pickup 51 to the inner peripheral position, and in this case, the operability is lowered. Let For this reason, the photosensor 63 for detecting the inner circumference cannot be eliminated, and there is a problem that the cost cannot be reduced.

  SUMMARY OF THE INVENTION The present invention solves the above-described problem. Even if there is no detection means such as a photosensor for detecting the inner circumference, the rack is removed from the feed groove of the traverse motor lead shaft even when the optical pickup is sent to the inner circumference position. An object of the present invention is to provide an optical disc apparatus in which the protruding engaging portion of the member is not detached.

  In order to solve the above problems, an optical disc apparatus according to a first aspect of the present invention includes a spindle motor having a turntable for rotating an optical disc, an optical pickup having a base for accessing the optical disc, and the optical pickup as a track of the optical disc. A traverse motor that provides a driving force for moving in the direction, a lead shaft that rotates by the driving force of the traverse motor, a spindle motor, a chassis that holds the traverse motor, and a protruding engagement that engages with the lead shaft A first part formed with a portion, a second part coupled to the base of the optical pickup, the first part having a predetermined distance in the track direction and forming a wall; and the first part A rack member having a third part supporting the second part, and the first part of the rack member And the first member of the rack member is flexible in the feeding direction of the optical pickup, and the optical pickup is configured so that the protruding engagement portion is not removed from the groove of the lead shaft. However, even after being sent to the terminal end, the first part of the rack member abuts against the wall of the second part after the first part of the rack member has moved in the track direction due to the rotation of the lead shaft, and the position thereof A stopper rib for restricting the protruding engagement portion of the first portion of the rack member from being removed from the groove of the lead shaft is provided on the opposite side of the protruding engagement portion of the first portion of the rack member. It is configured as described above.

  The optical disk apparatus according to claim 2 of the present invention is configured such that the stopper rib is formed on the chassis.

  The optical disk apparatus according to claim 3 of the present invention is configured such that the traverse motor has a bracket for holding the lead shaft, and a member having a stopper rib as another member is held on the bracket. .

  As described above, according to the present invention, the lead shaft will rotate even after the optical pickup is sent to the inner peripheral position without using the detection switch for detecting that the optical pickup has been sent to the inner peripheral position. Since the protrusion engaging portion of the rack member does not come off the feed groove from the feed groove of the lead shaft, the rotation of the lead shaft can be stopped, and the protrusion of the rack member that may occur in the past has occurred. There is no generation of noise due to the separation between the joint portion and the feed groove of the lead shaft, and the deterioration of quality can be prevented. In addition, since the rotation of the lead shaft does not slow down, the operability can be prevented from being lowered.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 11 show an optical disc apparatus according to the first embodiment. 1 is an assembled perspective view as seen from the back of the optical disk device, FIG. 2 is a partially enlarged view of FIG. 1, FIG. 3 is an assembled perspective view as seen from another angle, and FIGS. 4 (a) and 4 (b) are configurations. FIG. 5 is an exploded perspective view of a component, FIG. 6 is a partial assembly perspective view, FIG. 7 is a partial plan assembly view, and FIGS. 8A and 8B are partial assembly views. FIG. 9 is a partially assembled perspective view, and FIGS. 10 and 11 are partially assembled plan views.

  1 to 5, reference numeral 1 denotes a chassis, and 2 a spindle motor, which has a turntable 3 for rotating an optical disk (not shown), and is fixed to the chassis 1 via a motor screw 4. Reference numeral 5 denotes an optical pickup that extracts information from the optical disk. The base 5a, which is a main body, has screw holes 5b, bosses 5c and 5d, two main shaft holes 5e, and a sub shaft guide 5f. In the conventional example, a photosensor for detecting the inner circumference is provided in the vicinity of the spindle motor 2, but this is not necessary in the present embodiment.

  Reference numeral 13 denotes a main shaft, and reference numeral 14 denotes a sub shaft. The main shaft hole 5e and the sub shaft guide 5f of the optical pickup 5 are supported by the optical pickup 5 while being slidable in the track direction of the disk, and are fixed to the chassis 1. .

  Reference numeral 6 denotes a traverse motor which gives a driving force for moving the optical pickup 5 and has a lead shaft 7 and a bracket 8 (not shown in FIGS. 1 and 2), and is fixed to the chassis 1 through a set screw 9. Has been. The lead shaft 7 has a feed groove 7a, the second portion 10a of the rack member 10 has a screw hole 10e, and is screwed into a screw hole 5b of the optical pickup 5 via a stop screw 11. , Fixed to the base 5a. In addition, a wall 10h is provided in the second portion 10a.

  Further, as shown in FIG. 4A and FIG. 4B and FIG. 5 shown in the X1-X1 cross section in the same figure, the rack member 10 has a protrusion-like engagement that engages with the feed groove 7a of the lead shaft 7. A first portion 10c having a joint portion 10d and a third portion 10b having a U-shaped spring property are provided between the first portion 10c and the second portion 10a. Further, a pressing spring 12 as a pressing member is incorporated between the boss 10f of the second portion 10a and the boss 10g of the first portion 10c. The pressing spring 12 constantly applies a force in the direction from the second portion 10a of the rack member 10 to the first portion 10c so that the protruding engagement portion 10d of the first portion 10c is disengaged from the feed groove 7a of the lead shaft 7. The driving force of the lead shaft 7 is transmitted to the optical pickup 5 without any change. The force of the holding spring 12 is about 0.3 to 0.5N.

  The chassis 1 has a stopper rib 1 a, and the rib 1 a has a slope 1 b, a stopper surface 1 c, and a rib 1 d that regulates the inner peripheral position of the optical pickup 5.

  The operation of the optical disk apparatus configured as described above will be described. 6, 7, and 10 show diagrams when the optical pickup 5 is sent to the inner periphery by the rotation of the lead shaft 7 of the traverse motor 6 and the base 5 a hits the rib 1 d of the chassis 1. For explanation, FIGS. 6 and 7 do not show the bracket 8 of the traverse motor 6 among the components. FIG. 10 shows only a part of the chassis 1, the turntable 3, and the rack member 10, and the lead shaft 7 and the bracket 8 of the other traverse motor 6 are not shown.

  The protruding engagement portion 10 d of the first portion 10 c of the rack member 10 is engaged with the feed groove 7 a of the lead shaft 7. Since the rack member 10 is composed of a second portion 10c, a third portion 10b, and a first portion 10a, and is integral, the protruding engaging portion 10d engaged with the feed groove 7a by the rotation of the lead shaft 7 is used. Since the second portion 10a of the rack member 10 moves simultaneously without delay, the optical pickup 5 also moves simultaneously. Therefore, as shown in FIG. 7, the gap X2 between the first portion 10c and the second portion 10a of the rack member 10 does not change.

  Further, when the optical pickup 5 comes to this position, the first portion 10 c of the rack member 10 becomes the position of the inclined surface 1 b of the stopper rib 1 a of the chassis 1. When the second portion 10 c of the rack member 10 is separated from the lead shaft 7 when sent to the inner peripheral position of the optical pickup 5, it plays a role of regulating in the direction of the lead shaft 7.

  The lead shaft 7 is rotated by the driving force of the traverse motor 6 to this position, and the optical pickup 5 is sent. However, the rotation of the lead shaft 7 is rotated for a certain time after the movement of the optical pickup 5 is stopped. The next state will be described with reference to FIGS.

  For explanation, FIGS. 8 and 9 do not show the bracket 8 of the traverse motor 6. Further, FIG. 11 shows only a part of the chassis 1, the turntable 3, and the rack member 10, and the lead shaft 7 and the bracket 8 of the other traverse motor 6 are not shown.

  Even after the optical pickup 5 moves to the inner peripheral position, the lead shaft 7 rotates. Therefore, the protrusion-like engagement portion 10d engaged with the feed groove 7a moves in the direction of arrow P in FIG. This is because the third portion 10b of the rack member 10 is elastically deformed. After the protrusion-like engaging portion 10d moves, the gap X2 shown in FIG. 7 becomes zero because the protruding engagement portion 10d comes into contact with the wall 10h of the rack member 10 and stops. As shown in FIG. 8B, an X3-X3 cross section of FIG. 8A is obtained. At that time, the stopper rib 1b of the chassis 1 is provided at the rear portion of the second portion 10c of the rack member 10 having the protruding engagement portion 10d. The stopper surface 1c comes into contact with each other and restricts movement in the arrow Q direction. For this reason, since the protrusion-like engaging portion 10d remains engaged with the feed groove 7a of the lead shaft 7, the lead shaft 7 cannot rotate. Thereafter, the rotational force of the traverse motor 6 works for a certain period of time, but no noise is generated because the feed groove 7a of the lead shaft 7 and the protrusion-like engagement portion 10d remain engaged. Further, since the height of the stopper rib 1b of the chassis 1 is a distance of the dimension X4 from the center of the lead shaft 7, the first portion 10c of the rack member 10 and the stopper surface 1c of the stopper rib 1b of the chassis 1 are located. Even if the stopper surface 1c is displaced close to the lead shaft 7 in the clearance relationship, the second portion 10c of the rack member 10 only rotates in the direction of the arrow R, and the amount of engagement between the protruding engagement portion 10d and the feed groove 7a is as follows. It will not change and will not come off. Here, if the dimension X4 is a value of 0 or more, the effect can be obtained. Further, since the stopper surface of the stopper rib 1a of the chassis 1 is outside the normal feeding range of the optical pickup 5 (the first portion 10c of the rack member 10), as shown in FIG. Thus, even if the projecting engagement portion 10d is detached from the feed groove 7a, the first portion 10c of the rack member 10 does not come into contact with or ride on the stopper rib 1a of the chassis 1; There is no fear of deformation and breakage due to riding on the portion 10c and the third portion 10b.

  Further, in this embodiment, the rack member 10 is provided with two third portions 10b having U-shaped spring properties, but the effect can be obtained without being limited to this number. Further, it is needless to say that the present effect can be obtained even if the shape has a plate shape, for example, as long as it has flexibility in the feeding direction of the optical pickup without being limited to the U-shape.

  Next, a second embodiment will be described with reference to FIGS. 12 is a partially exploded perspective view, and FIG. 13 is a partially assembled perspective view.

  The configuration of the rack member is the same as that of the first embodiment. The chassis 17 does not have the stopper rib of the first embodiment. The piece 16 as a separate member has the stopper rib 16a, the inclined surface 16b, the stopper surface 16c, and the groove 16d. A bending portion 19 a of the bracket 19 of the traverse motor 18 is provided. By incorporating the groove 16d of the piece 16 into the bent portion 19a, the same effect as in the first embodiment can be obtained.

  Further, since the stopper rib 16a can determine the position with respect to the bracket 16, it has a specific effect that the relative position between the lead shaft 7 and the stopper rib 16a can be determined with high accuracy.

  In addition, the configuration in which the protrusion-like engaging portion does not come off when the optical pickup 5 comes to the inner peripheral position has been described. A similar effect can be obtained by providing the position.

  In the first and second embodiments, the stopper rib is formed by the chassis 17 and another piece 16, but a similar effect can be obtained by forming the stopper rib with a bracket of a traverse motor instead.

  The hand scanner optical disc apparatus according to the present invention is configured such that no problem occurs even if there is no inner circumference detection means of the optical pickup, but it can be moved by a projecting engagement portion that engages with the groove of the lead shaft. As long as it has a structure, it can be applied not only to an optical pickup, but also to a use in a device that stops operation at one end in a magnetic head or other movable structure.

FIG. 3 is an assembled perspective view of the optical disc device viewed from the back according to the first embodiment of the present invention. The partial expansion perspective view seen from the back of the optical disc device in a first embodiment of the present invention FIG. 3 is an assembled perspective view of the optical disc device viewed from the back according to the first embodiment of the invention. 1A is a plan view and FIG. 1B is a cross-sectional view of components of an optical disk device according to a first embodiment of the present invention. 1 is an exploded perspective view of components of an optical disc device according to a first embodiment of the present invention. FIG. 2 is a partial assembly perspective view of the optical disc apparatus according to the first embodiment of the present invention. FIG. 3 is a partial plan assembly diagram of the optical disc apparatus according to the first embodiment of the present invention. (A) Partial assembly plan view, (b) Cross-sectional view of the optical disc apparatus in the first embodiment of the present invention FIG. 2 is a partial assembly perspective view of the optical disc apparatus according to the first embodiment of the present invention. FIG. 1 is a partial assembly plan view of an optical disc apparatus according to a first embodiment of the present invention. FIG. 1 is a partial assembly plan view of an optical disc apparatus according to a first embodiment of the present invention. Partially exploded perspective view of an optical disc apparatus according to a second embodiment of the present invention Partially assembled perspective view of an optical disc apparatus according to a second embodiment of the present invention Assembly perspective view of the entire optical disc device as seen from the table of the conventional example Assembly perspective view of the entire optical disk device viewed from the back of the conventional example Exploded perspective view of components of conventional optical disc apparatus Partial sectional view of component parts of a conventional optical disc apparatus Partial sectional view of component parts of a conventional optical disc apparatus

Explanation of symbols

1, 17, 62 Chassis 1a, b, c Chassis stopper rib, slope, stopper surface 1d Chassis rib 2, 61 Spindle motor 3, 62 Turntable 5, 51 Optical pickup 5a Optical pickup base 6, 18 56 Traverse motor 7, 57 Lead shaft 7a Lead shaft feed groove 8, 19 Bracket 10, 53 Rack member 10a Rack member second part 10b Rack member third part 11c Rack member first part 11d Rack Protruding engaging portion 11h of the first part of the member 11h Wall of the second part of the rack member 12 Pressing spring 13 Main shaft 14 Sub shaft 16 Pieces 16a, b, c Piece stopper rib, same slope, same stopper surface 16d piece Groove 19 Bending part of bracket

Claims (3)

A spindle motor having a turntable for rotating an optical disc, an optical pickup having a base for accessing the optical disc, a traverse motor for providing a driving force for moving the optical pickup in the track direction of the optical disc, and driving the traverse motor A lead shaft that rotates by force, a chassis that holds the spindle motor and the traverse motor, a first portion formed with a projecting engagement portion that engages with the lead shaft, and a base of the optical pickup And a rack member having a second part having a predetermined distance in the track direction and forming a wall, and a third part for supporting the first and second parts. The first portion of the rack member is pressed so that the protruding engagement portion does not come off from the groove of the lead shaft. The pressure member and the first portion of the rack member have flexibility in the feeding direction of the optical pickup, and even after the optical pickup is sent to the end, the rotation of the lead shaft causes the rack member to rotate. After the first portion has moved in the track direction, the first portion abuts against the wall of the second portion, and at that position, the protruding engagement portion of the first portion of the rack member is a screw shaft. An optical disc apparatus characterized in that a stopper rib is provided on the opposite side of the protruding engagement portion of the first portion of the rack member so as not to be removed from the groove. 2. The optical disc apparatus according to claim 1, wherein the stopper rib is formed on the chassis. The optical disk apparatus according to claim 1, wherein the traverse motor has a bracket for holding a lead shaft, and a member having a stopper rib is held by the bracket.

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