JP2006073145A - Optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology which realizes an inexpensive constitution, without degrading its performance and affecting its size due to the reduction in vibrations and noises when an optical pickup is moved, in an optical disk device. <P>SOLUTION: An optical pickup driving mechanism member is constituted so that an elastic body having elastic performance is made to intervene, attach, and hold between the optical pickup and a fastening and holding member. This allows the transformation of force to be cut by an independent movement from the optical pickup as the driving mechanism member, and impulsive vibrations and impulsive noises generated in a guide receiving section of the optical pickup to be reduced, without converting the inertial force generated when the optical pickup is moved, into the torque. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a technique for reducing vibration and noise during movement of an optical pickup in an optical disc apparatus.

  2. Description of the Related Art Conventionally, optical disc apparatuses having substantially the same basic configuration have been mainly used for PC (personal computer) applications. However, in recent years, products that employ a writing DVD drive device as a camcorder are rapidly spreading. When used as a camcorder, it is naturally required to reduce the vibration and noise of the device due to its usage. Also in PC applications, as in the case of notebook PCs, further reductions in vibration and noise are required rather than downsizing and thinning of the device. In any application, cost reduction is an essential technology.

The structure of the optical pickup drive unit in the prior art is a fastening member that loosens the optical pickup drive mechanism member for driving the optical pickup in order to reduce the size, thickness, cost, and ensure the performance of the optical pickup. A general configuration is that of fixing to an optical pickup. (For example, see Patent Documents 1 and 2)
JP 2002-29739 A JP 2000-030881 A

Problems of the conventional example to be solved by the invention will be described with reference to FIGS.
9 and 10 are a schematic view and a rear view of a conventional optical disc drive in the optical disc apparatus, FIG. 11 is a detailed diagram of an optical pickup driving unit of the conventional optical disc device, and FIG. 12 is a conventional optical pickup driving unit shown in FIG. FIG. 13 is a detailed cross-sectional view, FIG. 13 is a problem explanatory diagram in the conventional example, and FIG.

  Here, the linear movement operation of the optical pickup 3 in the radial direction of the optical disk is provided in the optical pickup driving motor 8 in conjunction with the rotational operation of the optical pickup driving motor 8 which is a driving source, and the spiral optical pickup feeding is performed. The optical pickup driving guide member 8a having the screw groove is rotated and generated by the optical pickup driving mechanism member 5 having the rack gear 5a engaged with the spiral groove. At this time, in the prior art, as shown in FIGS. 11 and 12, the optical pickup driving mechanism member 5 for driving the optical pickup 3 is fixed to the optical pickup 3 without loosening by the fastening member 10. Therefore, when a sudden speed change (acceleration) occurs in the optical pickup 3 such as when the movement starts from the stopped state or when the moving state stops, as shown in FIGS. 13 and 14, the inertia force F corresponding to the acceleration is obtained. Is generated in the optical pickup 3 without being attenuated in the transmission path. Further, the inertial force F generated in the optical pickup 3 as described above becomes a rotational force M with the contact portion between the rack gear 5a and the spiral groove of the optical pickup driving guide member 8a as a fulcrum, and the optical pickup 3 is swung in the rotational direction. It is. Here, the optical pickup driving mechanism member 5 includes a main guide guide member 6 that guides the movement of the optical pickup 3 and an optical pickup main guide guide receiver 3 a provided in the optical pickup 3 in order to enable smooth movement. Between 3b, optical pickup main guide guide receiving part gaps 3g and 3h for securing a predetermined gap are secured. The optical pickup 3 that receives the rotational force M is tilted due to the rattling of the gap, and the optical pickup main guide guide member receivers 3a and 3b of the optical pickup 3 collide with the main guide guide member 6 violently. Impact vibration and impact noise are generated at 14 arrows C and D. Further, the impact vibration generated at this time is propagated to the mechanical chassis 4 through the main guide guide member 6 and further to the set main body through the vibration attenuating member 11 for holding the mechanical chassis 4. Although some vibration damping effect can be expected by the mechanical chassis holding vibration attenuating member 11 that supports the mechanical chassis 4, a large effect cannot be expected depending on the frequency band or the size of the propagation. In particular, when the above optical disk apparatus is used for camcorders, even if it is used by directly holding the set by hand, even very minute vibrations can degrade the quality of the product. Further, the impact noise generated above may be recorded as an unpleasant sound as well as annoying. In addition, the vibration generated as described above may affect the data reading or data writing performance of the optical pickup 3 on the optical disk.

  The object of the present invention is to reduce the vibration or noise reduction between the optical pickup and the main guide guide member related to the product quality, and to make the optical pickup drive mechanism member elastic between the optical pickup and the fastening holding member. An object of the present invention is to provide a technique that can be solved with a simple configuration in which an elastic body having performance is interposed and held.

  In order to solve the above problems, in the present invention, an optical pickup for recording or reproducing information on an optical disc, an optical disc rotation driving motor for rotating the optical disc, and the optical pickup to be movable in the radial direction of the optical disc. The two guide guide members, a mechanical chassis for fixing the guide guide member, an optical pickup drive motor as a drive source for driving the optical pickup, and the optical pickup drive motor are provided in the optical pickup drive. A drive guide member having a spiral optical pickup feed screw groove that rotates in conjunction with the rotation operation of the motor, and a light having a rack gear that is provided in the optical pickup and engages with the spiral feed screw groove A pickup drive mechanism member and the optical pickup drive mechanism member attached to and held by the optical pickup In the optical disk apparatus having a fastening holding member fit, the optical pickup drive mechanism member, is interposed between the elastic body having an elastic performance, by the fastening member, characterized in that held attached to the optical pickup. With this configuration, it is possible to significantly reduce impact vibration and impact noise generated between the guide guide member of the optical pickup and the gap between the guide guide member receivers. As a result, it is possible to provide an optical disc apparatus having a great effect on low vibration and low noise.

  Further, the optical pickup driving mechanism member is made of resin, and the elastic body having the elastic performance is formed integrally with the optical pickup driving mechanism member. With this configuration, an inexpensive optical disc apparatus can be provided without increasing the number of parts.

  Furthermore, the elastic body having the elastic performance is a separate member from the optical pickup driving mechanism member, and a buffer member is used. With this configuration, it is possible to considerably reduce impact vibration and impact noise caused by using a coil spring or the like as an impact buffer member.

  Furthermore, the elastic body having the elastic performance is a separate member from the optical pickup driving mechanism member, and a vibration damping member is used. With this configuration, it is possible to significantly reduce impact vibration and impact noise caused by using a rubber damper or the like as a vibration damping member.

  In the present invention, the optical pickup driving mechanism member having the rack gear can be operated independently of the optical pickup by the above-described configuration, and is held with rattling that can adjust the movable range thereof. . Here, as described in the problem of the prior art, the transmission of the sudden inertia force generated in the optical pickup using the optical pickup driving motor as the generation drive source is the fluctuation of the optical pickup driving mechanism member having the backlash. Therefore, the optical pickup drive mechanism member is temporarily cut by rotating independently of the optical pickup, and the transmission path is cut off. Therefore, even when such a sudden inertia force is generated, a sudden rotational force is not generated in the optical pickup, and an impact vibration generated between the guide guide member of the optical pickup and the guide guide member receiver. The impact noise can be reduced considerably.

  Here, the rattling range of the optical pickup driving mechanism member described above and the ease of movement within the rattling range have a great correlation with the positional accuracy when the optical pickup moves in the radial direction of the optical disc. When the rattling range is large and rattling is likely to occur, the above-described positional accuracy of the optical pickup during movement tends to deteriorate. However, since the rattling range and the ease of movement of the optical pickup driving mechanism member described above can be adjusted by the gap amount and the magnitude of the pressing force, the optical pickup moving position required for the optical disk device to be used By adjusting the respective amounts according to the accuracy, the positional accuracy of the optical pickup during movement can be ensured.

  As described above, the configuration of the present invention can provide an optical disc apparatus that has a simple configuration, is inexpensive, does not affect the size, and has a large effect on low vibration and noise while ensuring the positional accuracy of the optical pickup during movement. It becomes.

  According to the present invention, it is possible to provide an optical disc apparatus that is effective for low vibration and low noise and improves usability.

  Between the optical pickup drive mechanism member having the rack gear and the fastening holding member for fastening and holding the member, an elastic body having an elastic performance integrated with the drive mechanism member or as a separate member is inserted, and the elastic body is The optical pickup driving mechanism member is attached to and held with respect to the optical pickup by interposing.

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

  1 to 6 are explanatory diagrams of an embodiment of an optical disk apparatus according to the present invention. 1 is a detailed view of an optical pickup driving unit showing the configuration of the present invention, FIG. 2 is a detailed sectional view of the optical pickup driving unit, FIG. 3 is a schematic diagram of an optical disk apparatus according to an embodiment of the present invention used for a DVD camcorder, and FIG. These are back views of the optical disk device.

  Here, a basic configuration and operation of a general optical disc apparatus will be described. Reference numeral 1 denotes an optical disk, which is writable only for data reading. Data is read or written by the optical pickup 3. The optical pickup 3 is movable in the radial direction of the optical disc 1, and the drive source for the movement is an optical pickup driving motor 8. The optical pickup driving motor 8 is provided with an optical pickup driving guide member 8a having a spiral optical pickup feeding screw groove. The optical pickup driving guide member 8a is interlocked with the rotation operation of the optical pickup driving motor 8 as well. Performs rotation. An optical pickup driving mechanism member 5 having a rack gear 5a that engages with a spiral groove provided in the optical pickup driving guide member 8a is attached to the optical pickup 3 by a fastening holding member 10, and the optical pickup driving mechanism member 5 Thus, the rotational movement of the optical pickup driving guide member 8a is converted into a linear movement. The optical pickup 3 is held by the main guide guide member 6 and the sub guide guide member 7 and the optical pickup main guide guide receivers 3 a and 3 b and the optical pickup sub guide guide receiver 3 c provided on the optical pickup 3. A linear motion in the direction of the guide members 6 and 7 is performed. The main and sub guide guide members 6 and 7 are fixed to the mechanical chassis 4, and the mechanical chassis 4 is connected to the set main body side by a mechanical chassis holding vibration damping member 11.

  The present invention is characterized in the structure for holding the optical pickup driving mechanism member 5 to the optical pickup 3 described above. In the conventional example, it has been described with reference to FIG. 12 that the optical pickup driving mechanism member 5 is fixed to the optical pickup 3 by the fastening and holding member 10 without loosening. FIG. 2 shows a detailed cross-sectional view of the optical pickup driving portion of the present invention. In one embodiment of the present invention, the optical pickup driving mechanism member 5 is a resin member, and the elastic shape portion 5b having elastic performance is an optical pickup driving portion. It is formed integrally with the mechanism member 5. The elastic shape portion 5b generates an elastic force by bending the elastic shape portion tip portion 5b '. Further, the elastic force acts in a direction in which the optical pickup drive mechanism member 5 is pressed against the optical pickup 3 against the optical pickup drive mechanism member installation surface 3f that is an installation installation surface of the optical pickup drive mechanism member 5 and the optical pickup 3. . Here, the bending of the elastic shape portion distal end portion 5 b ′ of the optical pickup driving mechanism member 5 is generated by the fastening holding member 10. Therefore, the optical pickup drive mechanism member 5 of the present invention is configured to be attached and held to the optical pickup 3 with the elastic shape portion 5b having elastic performance interposed between the optical pickup 3 and the fastening holding member 10. Yes. With this configuration, the optical pickup driving mechanism member 5 generates a force greater than the frictional force generated on the optical pickup driving mechanism member installation surface 3f in the in-plane direction of the optical pickup driving mechanism member installation surface 3f. Only in this case, an independent operation with respect to the optical pickup 3 is possible. Further, the movable range at this time includes optical pickup driving mechanism member general positioning convex portions 3d and 3e provided in the optical pickup 3, and optical pickup driving mechanism member general positioning holes 5c engaged with the convex portions. It is determined by the size of the gap with 5d. The ease of movement in the optical pickup drive mechanism member installation surface 3f is determined by the frictional force in the optical pickup drive mechanism member installation surface 3f generated by the elastic force of the elastic shape portion 5b.

  Next, the effect of the present invention will be described with reference to FIGS. FIG. 5 is a diagram for explaining the effect in one embodiment of the present invention, and FIG. 6 is a detailed diagram for explaining the effect in one embodiment of the present invention. The optical pickup 3 needs to read and write data at a predetermined location on the optical disk 1 with high accuracy and speed. For this reason, the movement of the optical pickup 3 is forced to perform an operation accompanied by a rapid change in speed, such as a sudden start from a stop state and a sudden stop from a moving state. In this case, since a rapid speed change is involved, a large inertial force is generated in the optical pickup 3 in the traveling direction. The linear movement of the optical pickup 3 is performed by using an optical pickup driving guide member 8 a that rotates in conjunction with the rotational operation of the optical pickup driving motor 8 as a driving source. Here, for example, when the optical pickup 3 suddenly stops from a moving state, the operation of the optical pickup driving guide member 8a serving as a driving source stops, but the inertial force F is applied to the optical pickup 3 in the traveling direction. Therefore, the optical pickup 3 tries to move further in the traveling direction without suddenly stopping. Here, in the optical pickup driving mechanism member 5 having the rack gear 5a, since the rack gear 5a portion is engaged with the spiral groove of the optical pickup driving guide member 8a, the inertia force F generated in the optical pickup 3 is A rotational force M with the engaging portion as a fulcrum is generated in the optical pickup 3. Although the conventional example has been described above with reference to FIG. 13, when the optical pickup driving mechanism member 5 is fixed to the optical pickup 3 without loosening by the fastening member 10 as in the conventional example, the rotation generated as described above. The force M is transmitted to the optical pickup 3 without being attenuated in the transmission path, and the optical guide main guide guide receiving portion gap between the main guide guide member 6 and the optical pickup main guide guide receivers 3a and 3b necessary for the structure is transmitted. Due to 3g and 3h, the optical pickup 3 is tilted, and a phenomenon of intense collision with arrows C and D in the figure occurs. At this time, impact vibration and impact noise, which are problems, are generated.

  However, with the configuration of the present invention, as described above, the optical pickup driving mechanism member 5 can operate independently of the optical pickup 3 with a predetermined rattling with respect to the optical pickup 3. As shown in FIG. 6, only the optical pickup driving mechanism member 5 performs a rotational motion, and all of the inertial force F generated in the optical pickup 3 is not converted into a rotational force. The tilt can be kept extremely small. Therefore, the impact vibration and the impact noise generated between the main guide guide 6 and the optical pickup main guide guide receivers 3a and 3b, which have been conventionally generated, are dramatically reduced. This operation can be explained in the same manner even when the optical pickup 3 starts suddenly from a stopped state.

  In addition, similar positioning convex portions 3d and 3e of the optical pickup driving mechanism member provided in the optical pickup 3 and the optical pickup driving mechanism member schematic positioning hole 5d, which are generated by the rotational movement of the optical pickup driving mechanism member 5, are provided. Impact vibration and impact noise generated between them are so small as to be negligible compared to the magnitude of vibration and noise generated in the optical pickup 3 due to the material and mass of the optical pickup drive mechanism member 5.

  Here, the movement positioning accuracy of the optical pickup 3 in the radial direction of the optical disk 1 is affected by the movable range and the ease of movement of the optical pickup driving mechanism member 5 described above. Needless to say, the positioning accuracy of the optical pickup 3 in the radial direction of the optical disk 1 is required to be accurate and follow the rotational operation of the optical pickup driving motor 8 as a driving source. The rattling that the optical pickup drive mechanism member 5 has is a direction that is disadvantageous to this followability. However, this followability varies depending on the use of the optical disk apparatus, and is determined with a certain allowable range. In the present invention, the movable range and easiness of movement of the optical pickup driving mechanism member 5 described above are determined by the optical pickup driving mechanism member rough positioning convex portions 3d and 3e provided in the optical pickup 3 and the driving mechanism member rough positioning. By adjusting the size of the gap between the holes 5c and 5d and the size of the elastic force of the elastic shape portion 5b, it is possible to satisfy the movement accuracy of the optical pickup 3 required for each optical disk device. is there.

  In addition, the configuration of the present invention is very simple, inexpensive without increasing the number of parts, has little influence on downsizing and thinning, and does not deteriorate the performance of the optical disk device, and vibrations generated when moving the optical pickup and This can have a great effect on noise reduction.

  A second embodiment according to the present invention is shown in FIG. The elastic body interposed between the optical pickup 3 for holding the optical pickup driving mechanism member 5 described in the first embodiment and the fastening holding member 10 is separated from the optical pickup driving mechanism member 5, and is a buffer member so-called. In this example, the coil spring 12 is used. Although not shown in the figure, the buffer member may be a leaf spring. The effect of the present embodiment is the same as that described in the first embodiment.

  A third embodiment according to the present invention is shown in FIG. The elastic body interposed between the optical pickup 3 and the fastening holding member 10 for holding the optical pickup driving mechanism member 5 described in the first embodiment is separated from the optical pickup driving mechanism member 5, and the elastic performance is improved. This is an example of a so-called rubber damper 13 having a vibration damping member. In general, a damping member for damping vibration also has elastic performance. The effect of the present embodiment is the same as that described in the first embodiment.

  According to the present invention, it is possible to provide an optical disc apparatus that is inexpensive, can be reduced in size, and can be thinned without deteriorating the performance of the optical disc apparatus, and that is low in vibration and low in noise. Therefore, the effect can be expected particularly in an optical disk device used for a camcorder or a slim drive for a notebook PC that is required to be small and thin.

1 is a detailed view of an optical pickup driving unit of an optical disc apparatus as an embodiment of the present invention. 1 is a detailed cross-sectional view of the optical pickup driving unit of the embodiment of the present invention shown in FIG. Schematic diagram of an optical disk apparatus according to an embodiment of the present invention used for a DVD camcorder. FIG. 3 is a rear view of the optical disk apparatus according to the embodiment of the present invention. Effect explanatory drawing in one Example of this invention Detailed explanation of effects in one embodiment of the present invention Embodiment 2 of the present invention Embodiment 3 of the present invention Schematic diagram of conventional optical disc apparatus FIG. 9 is a rear view of the conventional optical disc apparatus in FIG. Detailed view of optical disc drive optical pickup drive unit of conventional example FIG. 11 is a detailed sectional view of the conventional optical pickup driving section shown in FIG. Problem explanatory drawing in the conventional example Detailed explanation of problem in conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Optical disk, 2 ... Optical disk drive motor, 3 ... Optical pick-up,
3a, 3b ... optical pickup main guide guide receiver,
3c: Optical pickup sub-guide guide receiver,
3d, 3e... Optical pickup drive mechanism member schematic positioning convex portion,
3f: Optical pickup drive mechanism member installation surface,
3g, 3h: Optical pickup main guide guide receiving part gap, 4 ... Mechanical chassis,
5 ... Optical pickup drive mechanism member, 5a ... Rack gear, 5b ... Elastic shape part,
5b '... elastic shape part front end part, 5c, 5d ... optical pickup driving member general positioning hole,
6 ... main guide guide member, 7 ... sub guide guide member, 8 ... optical pickup drive motor,
8a ... optical pickup driving guide member, 9 ... rack gear pressing spring,
10 ... Fastening holding member, 11 ... Vibration damping member for holding the mechanical chassis,
12 ... buffer member (coil spring), 13 ... damping member (rubber damper)

Claims (4)

An optical pickup for recording or reproducing information on an optical disc, an optical disc rotation motor for rotating the optical disc, two guide guide members for enabling the optical pickup to move in the radial direction of the optical disc, and the guide guide A mechanical chassis for fixing the member; an optical pickup driving motor as a driving source for driving the optical pickup; and an optical pickup driving motor, which rotates in conjunction with the rotational operation of the optical pickup driving motor. A drive guide member having a spiral groove for feeding an optical pickup to be performed, an optical pickup drive mechanism member having a rack gear provided in the optical pickup and engaging with the spiral feed screw groove, and the optical pickup drive mechanism member An optical disc device provided with a fastening holding member for attaching and holding the optical pickup to the optical pickup In,
An optical disc apparatus, wherein the optical pickup drive mechanism member is attached and held to the optical pickup by the fastening member with an elastic body having elastic performance interposed therebetween.   2. The optical disc apparatus according to claim 1, wherein the optical pickup driving mechanism member is made of resin, and the elastic body having the elastic performance is formed integrally with the optical pickup driving mechanism member.   2. The optical disc apparatus according to claim 1, wherein the elastic body having the elastic performance is a separate member from the optical pickup driving mechanism member, and a buffer member is used. 2. The optical disc apparatus according to claim 1, wherein the elastic body having the elastic performance is a separate member from the optical pickup driving mechanism member, and a vibration damping member is used.

Images