JP5609100B2 - Optical disk device - Google Patents

Description

  The present invention relates to an optical disc apparatus that reads and / or writes information on an optical disc that is a recording medium.

  An optical disk device reads and / or writes information by inserting an optical disk, which is a recording medium, and irradiating light onto an information recording surface of the optical disk. In an optical disc apparatus, since information is read and / or written using light, it is necessary to suppress contamination by foreign matters such as dust and dirt. In addition, since incident light from the outside may cause a problem, it is necessary to block incident light. Furthermore, since the optical disk is rotated at a high speed, the rotational sound of the motor is loud and the sound must be shielded.

  Then, cover the opening of the chassis of the optical disk device with a cover and seal it, and the drive unit that rotates the disk and the optical pickup that irradiates the optical disk with light are placed inside the chassis. And the incidence of external light is suppressed, and the sound generated inside is prevented from leaking outside.

  A conventional optical disc apparatus will be described with reference to the drawings. FIG. 5 is a plan view showing the appearance of a conventional optical disc apparatus. As shown in FIG. 5, the conventional optical disc apparatus B includes a chassis 91 and a cover 92 for covering and sealing the opening of the chassis 91. The chassis 91 is a member having a rectangular shape in plan view, and includes a wall portion 911 that stands up from the edge and surrounds the inside of the chassis 91.

  The cover 92 is fixed to the chassis 91 by screwing to four screwing portions 912 formed on the chassis 91. The screwing portions 912 are formed integrally with the wall portion 911 and are formed one by one near the four corners where the rigidity of the wall portion 911 is high. The cover 92 is fixed to the highly rigid screwing portion 912 by being screwed and firmly pressed against the chassis 91.

  As a result, the chassis 91 and the cover 92 are in close contact with each other, and foreign matter such as dust and dirt is mixed in from the gap between the chassis 91 and the cover 92, light is incident from the outside, and internal noise leaks to the outside. It is possible to suppress this. Further, by attaching the cover 92, the chassis 91 (particularly the wall portion 911) is reinforced, and the rigidity of the optical disc apparatus B itself can be increased.

  In the optical disc apparatus, the hole 921 through which the screw Sc of the cover 92 passes and the screwing portion 912 may be displaced due to errors such as manufacturing error and assembly error. Normally, the hole 921 of the cover 92 has a countermeasure in consideration of a certain amount of error, such as a hole larger than the diameter of the screw Sc and smaller than the head of the screw, or a long hole assuming a deformation direction.

  However, if the error is larger than expected or the direction of occurrence of the error is different from the expected direction, the chassis 91 and / or the cover 92 are fixed by forcibly overlapping the screwing portion 912 and the through-hole 921. And / or the cover 92 is distorted, and internal stress is generated in the vicinity of the screwing portion 912 and / or the through hole 921. As described above, the screwing portion 912 and its vicinity are highly rigid and difficult to deform. The stress applied to the screwing portion 912 may cause deformation such as bending and twisting of the entire chassis 91 and / or the cover 92.

  Thus, in order to suppress the deformation of the entire chassis 91 that is generated by forcibly screwing, the recording / reproducing apparatus described in Japanese Patent Laid-Open No. 10-134554 employs a low-rigidity shield cover, The shield cover is deformed to suppress deformation of the chassis.

  Further, in the inventions described in JP-A-6-282974 and JP-A-7-65567, when fixing a member in which torsion occurs, screws are fixed at three points for determining a plane, and the screws are fixed. The thing which suppresses the twist of members by adjusting well the position of is disclosed.

Japanese Patent Laid-Open No. 10-134554 JP-A-6-282974 JP-A-7-65567

  In the optical disk apparatus, a disk clamper (not shown) for sandwiching the optical disk with the turntable is rotatably attached to the cover 92. If the cover 92 is deformed, the holding of the optical disk by the turntable and the disk clamper may be incomplete. As a result, it becomes difficult to rotate the optical disk stably, and the accuracy of reading and / or writing information may be reduced or impossible. In the worst case, the optical disk and the optical pickup are in contact with each other. It is also conceivable that the optical disk becomes unplayable or the optical pickup is damaged.

  Further, when the linear expansion coefficients are different between the two members, the screwing portion and the through hole may be shifted due to the difference in linear expansion, and a shearing force may be generated. This shearing force causes a bending moment or a torsional moment to act on the chassis or cover. When the moment acts in this manner, the chassis and / or the cover may be deformed, and the accuracy of reading and / or writing of information with respect to the optical disc may be reduced or impossible.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an optical disc apparatus that can accurately read and / or write information while suppressing deformation of the entire apparatus.

  In order to achieve the above object, the present invention provides an optical disc apparatus comprising a chassis and a cover that covers an opening of the chassis and is screwed and fixed to a plurality of screwing portions formed on the chassis. At least one of the screwing parts is a screwing part having a lower rigidity than the other screwing parts.

  According to this configuration, since at least one screwing portion is formed so as to be less rigid than the other screwing portions, the screwing portion and the hole through which the cover screw penetrates are displaced due to an error or the like. Even then, since the error is absorbed by the deformation of the screwed portion having low rigidity and / or the vicinity thereof, the deformation of the chassis and / or the cover being twisted or bent is suppressed. Is possible.

  By suppressing the deformation of the chassis and / or the cover, it is possible to prevent a gap from being formed between the chassis and the cover, and foreign matter such as dust or dust can enter or external light can enter. Or a problem that noise generated inside leaks to the outside can be suppressed.

  Further, since the cover can be attached to the chassis so that there is no gap, the rigidity of the chassis and the cover can be increased. As a result, even when a force from the outside of the optical disk device is applied, it is not easily deformed, and it is possible to stably read and / or write information on the optical disk.

  In the above configuration, at least three screwing portions are provided, and the remaining screwing portions are provided at positions symmetrical with respect to the screwing portions having lower rigidity than the other screwing portions. Also good.

  According to this configuration, since the screwing portion having low rigidity is arranged at the center of symmetry of the three screwing portions, it is easy to deform so as to absorb each error.

  In the above configuration, the chassis and the cover are formed of materials having different linear expansion coefficients, and the screwing portion having rigidity lower than that of the other screwing portion is a deformation amount due to linear expansion of the chassis and the cover. It may be formed in a place where the difference between the two becomes large.

  According to this configuration, the difference in expansion due to heat between the chassis and the cover can be absorbed by the deformation of the screwing portion having low rigidity, so that the chassis and the cover are prevented from being deformed by being twisted or bent. Can do. Furthermore, by suppressing the deformation, it is possible to suppress the formation of a gap between the chassis and the cover.

  As a result, even when the optical disk device is driven for a long time and the temperature rises, it is possible to stably read and / or write information on the optical disk. As a result, the optical disk apparatus can be driven stably for a long time.

  In the above configuration, among the screwing portions, the screwing portions having lower rigidity than the other screwing portions are formed on the back side when the optical disc is inserted, and the remaining screwing portions are formed on the optical disc. It may be formed near the insertion opening.

  The said structure WHEREIN: The said chassis is equipped with the wall part standingly arranged from the edge so that the inside might be enclosed, and the said screwing part may be integrally formed in the said wall part.

  According to the present invention, it is possible to provide an optical disc apparatus that can accurately read and / or write information while suppressing deformation of the entire apparatus.

It is a perspective view of the Blu-ray recorder which is an example of the apparatus provided with the optical disk device concerning the present invention. It is a top view in the state where the cover of the optical disk device concerning the present invention was removed. FIG. 3 is a plan view of a state where a cover is attached to the optical disc apparatus shown in FIG. 2. FIG. 4 is a cross-sectional view of the optical disc device shown in FIG. 3. It is a top view of the conventional optical disk apparatus.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a Blu-ray recorder which is an example of a device provided with an optical disk device according to the present invention. As shown in FIG. 1, the Blu-ray recorder Br is provided in a case Ca, a front cover Fc arranged in front of the case Ca, an optical disc apparatus A arranged inside the case, and the front cover Fc, and an optical disc Ds is provided. An opening Op through which the loaded disk tray 3 enters / exits is provided. Although not shown, a door that opens and closes in accordance with the insertion / ejection of the optical disk Ds is attached to the opening Op.

  An optical disk apparatus which is a main part of the present invention will be described with reference to the drawings. 2 is a plan view of the optical disk apparatus according to the present invention with the cover removed, FIG. 3 is a plan view of the optical disk apparatus shown in FIG. 2 with the cover attached, and FIG. It is sectional drawing of an optical disk device. 2, 3, and 4, the optical disc apparatus A includes a chassis 1 that is a casing, a traverse chassis 2 that is attached to the chassis 1 and that is close to and separated from the optical disc that is carried into the interior, A disk tray 3 for carrying in / out and a cover 4 covering the upper surface of the chassis 1 are provided.

  The chassis 1 is an integrally molded body of resin, and includes a wall portion 10 formed so as to surround the main body from the peripheral edge portion of the main body having a rectangular shape in plan view. The wall portion 10 includes a total of four fixing portions 100 for fixing the chassis 1 to the case Ca (see FIG. 1) on the front side (surface side into which the optical disc is inserted) and the back side of the side surface portion 101. Further, two screwing portions 11, 11 are provided in the vicinity of the fixing portion 100 on the front side of the wall portion 10, and one screwing portion 12 is provided in the center of the back surface portion 102 of the wall portion 10. The screwing portions 11 and 11 are reinforced by ribs themselves, and the rigidity is enhanced by the reinforcing ribs of the fixing portion 100 by being close to the fixing portion 100.

  The traverse chassis 2 includes a turntable 21 on which an optical disk is placed and rotated, and an optical pickup 22 that is supported by the traverse chassis 2 so as to approach and separate from the turntable 21 and irradiates the optical disk with light. . The traverse chassis 2 approaches the optical disc when the disc tray 3 is inserted and the optical disc moves to a predetermined position, and moves away from the optical disc when the disc tray 3 is ejected from the optical disc apparatus.

  The disc tray 3 is provided with a recess for placing an optical disc, and an opening through which the turntable 21 penetrates when the traverse chassis 2 is approaching is formed in the central portion. Note that the approach and separation of the traverse chassis 2 to and from the optical disk and the insertion and ejection of the disk tray 3 are performed by a single motor by using a driving mechanism, a driving force switching mechanism, and the like (not shown).

  The cover 4 is a member formed by cutting and bending a metal plate. As shown in FIGS. 3 and 4, the cover 4 covers the upper surface of the chassis 1, and noises during reading or writing of information on the optical disk are not exposed to the outside so that foreign matter such as dust or dust does not enter the inside of the chassis 1. In order to suppress leakage, the light is further disposed in close contact with the chassis 1 so that external light does not enter the inside of the optical disc apparatus. When the cover 4 is disposed on the upper portion of the chassis 1, through holes 41 and 42 for screwing are formed at positions corresponding to the screwing parts 11 and 11 and the screwing part 12. Further, a clamper 43 that presses the label surface of the optical disc Ds is rotatably supported on the cover 4.

  First, the operation of the optical disc apparatus will be described. When the disk tray 3 moves into the chassis 1 and the optical disk Ds reaches a predetermined position, the traverse chassis 2 approaches toward the optical disk Ds. At this time, the turntable 21 attached to the traverse chassis 2 is pushed from the information recording surface side of the optical disc Ds, and the optical disc Ds is separated from the disc tray 3. At this time, the clamper 43 comes into contact with the surface (label surface) opposite to the information recording surface, and the optical disc Ds is sandwiched between the turntable 21 and the clamper 43 and detached from the disc tray 3. In this state, the turntable 21 rotates, and the optical disc Ds rotates without contacting any members other than the turntable 21 and the clamper 43. Information is read and / or written by irradiating light from the optical pickup 22 to the information recording surface of the rotating optical disk Ds.

  In the optical disc apparatus A, information is read and / or written as described above. Therefore, if the clamper 43 is unstable or displaced, the rotation of the optical disc Ds becomes unstable, and information reading and ( Or) writing may fail. Therefore, in order to stably support the clamper 43, the cover 4 has sufficient rigidity, that is, the cover 4 is a member having a material and a shape that are difficult to deform.

  The cover 4 is fixed to the chassis 1 by allowing the screws Sc to pass through the through holes 41 and 41 and the through holes 42 and screwing the screws Sc to the screwing portions 11 and 11 and the screwing portions 12 of the chassis 1. Yes. The screwing portions 11 and 11 are formed on the side surface portion 101 of the wall portion 10. The side surface portion 101 is a standing wall extending in the longitudinal direction of the chassis 1, and even if stress in the longitudinal direction acts on the chassis 1, the stress is dispersed at the side surface portion 101, and the screwing portions 11 and 11 are not easily deformed or moved ( High rigidity). The screwing portions 11 and 11 are formed in the vicinity of a fixing portion for fixing the optical disc apparatus A to the case Ca (see FIG. 1), and the wall portions around the screwing portions 11 and 11 are formed thick. In addition, the ribs and the like are reinforced. Thereby, the screwing parts 11 and 11 become a structure which cannot change or move in directions other than a longitudinal direction.

  On the other hand, the screwing portion 12 is formed at the center of the rear surface portion 102 of the wall portion 10 in the short direction of the chassis 1, the back surface portion 102 is not reinforced, and the screwing portion 12 is low in rigidity and deformed. Easy to move (especially in the longitudinal direction of the chassis 1).

  When the cover 4 is attached to the chassis 1, the cover 4 is placed on the wall 10 so that the through holes 41, 41 of the cover 4 overlap the screwing parts 11, 11 of the chassis 1 and the through hole 42 overlaps the screwing part 12. To place. And the through-holes 41 and 42 are penetrated by the screw Sc, and are further fixed by screwing the screw Sc into the screwing portions 11 and 12.

  The through holes 41 and 42 are holes through which the screw Sc passes, and are formed larger than the diameter of the screw Sc in consideration of some manufacturing error of the chassis 1 and / or the cover 4. If the error of the chassis 1 and / or the cover 4 is larger than expected, the through hole and the screwing portion do not overlap accurately and screwing becomes difficult. Even when the through holes 41 and 42 of the cover 4 and the screwing portions 11 and 12 are forcibly screwed with the screw Sc, the screwing portion 12 having low rigidity is deformed or moved. Thereby, the stress acting on the chassis 1 and / or the cover 4 due to the error can be absorbed by the deformation and / or movement of the screwing portion 12.

  In addition, since the rigidity of the screwing portion 12 is low, the stress acting on other portions is small even if the screwing portion 12 is moved / deformed, and the deformation of the portion other than the screwing portion 12 of the chassis 1 and the cover 4 can be suppressed. It is.

  Next, the stress due to the difference in expansion amount due to heat of the optical disc apparatus will be described. The optical disc apparatus A includes a plurality of heat sources such as a motor (not shown) for rotating the turntable 21 on which the optical disc Ds is mounted at high speed, and a light source for emitting light irradiated on the optical disc Ds. . These heat sources are driven substantially simultaneously when information is read from and / or written to the optical disk, and heat is generated at a time, and the inside of the optical disk apparatus A reaches a high temperature.

  The heat generated from these heat sources propagates to the chassis 1 and the cover 4, and the chassis 1 and the cover 4 are expanded by the heat. As described above, the chassis 1 is made of resin and the cover 4 is made of a material different from metal, and the amount of deformation due to linear expansion is different. Further, since the optical disc apparatus A is formed in a rectangular shape, the amount of deformation is larger in the longitudinal direction than in the lateral direction.

  That is, during assembly, even if the deviation between the screwed portions 11 and 11 and the through holes 41 and 41 and the screwed portion 12 and the through holes 42 due to manufacturing or assembly errors is within an allowable range, There is a possibility that the chassis 1 and the cover 4 are deformed by bending, twisting, etc. due to the difference in the amount of linear expansion due to.

  Since the chassis 1 has the screwing portion 12 having low rigidity, the screwing portion 12 is deformed / moved even if a difference in expansion amount due to heat occurs between the chassis 1 and the cover 4, so that the expansion occurs. Absorb the difference in quantity. As a result, the chassis 1 and the cover 4 are deformed due to a difference in expansion amount due to heat between the chassis 1 and the cover 4, and a gap is formed between the chassis 1 and the cover 4, or due to the clamper 43 and the turntable 21. It is possible to prevent the holding of the optical disk Ds from becoming unstable.

  In addition, although the screwing part 12 is formed in the intermediate part of the back surface 102 of the wall part 10, it is not limited to it, The intensity | strength of the direction in which the deformation | transformation by the thermal expansion of the chassis 1 becomes large compared with another part. As long as it is formed in a weak part. However, since the screwing portions 11 and 11 are formed so as to be symmetric with respect to the screwing portion 12, it is possible to suppress torsion or the like due to a difference in deformation. Therefore, it is preferable that the screwing portions 11 and 11 are formed so as to be symmetrical to the screwing portion 12.

  As described above, when the cover is fixed using the screws of the three chassis, by forming the screwing portion for screwing at least one of the three to be easily deformed, a shift due to an error between the cover and the chassis or heat It is possible to absorb the difference in deformation amount due to. As a result, the cover and / or chassis can be prevented from warping (bending) or twisting, and the reading and / or writing accuracy of information on the optical disk can be prevented from being lowered. .

  In the optical disk device of the above embodiment, the cover is fixed using three screws, but the present invention is not limited to this. When fixing with four or more screws, one or two screws are fixed to a highly rigid (deformable or difficult to move) screwing part, and the remaining screws have low rigidity (deformable or easy to move) It is possible to suppress the deformation of the chassis and the cover by being configured to be fixed to the screwing portion. However, since the minimum number of points constituting the plane is three, three points are preferable because those fixed at three points are difficult to twist in a plane and can be stably fixed. At this time, in order to suppress the occurrence of twisting, it is preferable that the screwing portion having high rigidity as viewed from the screwing portion having low rigidity is formed at a symmetrical position.

  In the above embodiment, the optical disk apparatus has been described with reference to a tray loading type optical disk apparatus that loads / unloads an optical disk with a disk tray. However, a direct loading type optical disk apparatus in which only an optical disk is loaded / unloaded is described. It is also possible to adopt. Furthermore, the present invention is not limited to these, and can be widely used in optical disk devices having a chassis and a cover made of materials having different linear expansion coefficients.

  INDUSTRIAL APPLICABILITY The present invention can be used for an optical disc apparatus that is fixed by screwing a cover to a chassis.

DESCRIPTION OF SYMBOLS 1 Chassis 10 Wall part 100 Fixed part 101 Side part 102 Back part 2 Traverse chassis 21 Turntable 22 Optical pickup 3 Disc tray 4 Cover 41 Through hole 42 Through hole 43 Clamper

Claims (5)

The chassis,
An optical disc apparatus that covers an opening of the chassis and has a cover that is screwed to a plurality of screwing portions formed on the chassis;
The optical disk apparatus, wherein the plurality of screwing portions include a reinforcing screwing portion reinforced by a reinforcing rib, and a screwing portion having a rigidity lower than that of the reinforcing screwing portion and deformable.   The optical disk apparatus according to claim 1, wherein the screwing portions are provided at least in three places, and the reinforcing screwing portions are provided at positions symmetrical with respect to the deformable screwing portions. The chassis and the cover are formed of materials having different linear expansion coefficients,
The optical disk device according to claim 1, wherein the deformable screwing portion is formed in a place where a difference in deformation amount due to linear expansion of the chassis and the cover becomes large.   The deformable screwing portion of the screwing portion is formed on a back side when the optical disc is inserted, and the reinforcing screwing portion is formed near an insertion opening of the optical disc. The optical disc apparatus according to any one of claims 1 to 3. The chassis includes a wall portion erected from an edge so as to surround the inside,
The optical disk apparatus according to claim 1, wherein the plurality of screwing portions are formed integrally with the wall portion.

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