JP4941005B2 - Skew adjustment mechanism in disk drive device - Google Patents

Description

  The present invention relates to a technical field of a skew adjustment mechanism in a disk drive device. Specifically, the present invention relates to a technical field in which an adjustment position by an adjustment member is provided outside the outer periphery of a disk-shaped recording medium mounted on a disk table to facilitate skew adjustment.

2. Description of the Related Art A disk drive device that records or reproduces information signals on a disk-shaped recording medium mounted on a disk table is provided with an optical pickup that moves in the radial direction of the disk-shaped recording medium.

  The optical pickup is equipped with an objective lens driving device that moves the objective lens in a desired direction and a light emitting part such as a laser diode that emits laser light, and is guided by a pair of guide shafts to move in the radial direction of the disc-shaped recording medium. In this state, the light emitted from the light emitting unit is collected by the objective lens and irradiated onto the recording surface of the disk-shaped recording medium, and information signals are recorded or reproduced.

  The laser beam emitted toward the disc-shaped recording medium through the objective lens has an optical axis with respect to the recording surface of the disc-shaped recording medium in order to prevent the occurrence of aberration and ensure good recording / reproduction characteristics. It needs to be irradiated in a vertical state.

  Therefore, in the disk drive device, skew adjustment for adjusting the inclination (skew) of the optical axis of the laser beam irradiated to the disk-shaped recording medium via the objective lens with respect to the recording surface is performed at least before the shipment of the product. .

  As a conventional skew adjustment method, for example, the recording / reproducing state of a disk-shaped recording medium mounted on a disk table is detected based on jitter (fluctuation in the time base accuracy of digital data) so that the jitter becomes an optimum value. There is a method of adjusting the position of the shaft (for example, see Patent Document 1). In such a method based on jitter, the adjustment position for adjusting the position of the guide shaft is a position hidden by the disk-shaped recording medium mounted on the disk table. This is done from the side opposite to the side where the medium exists (lower side).

  As another conventional skew adjustment method, for example, there is a method of measuring the inclination of the guide shaft with respect to the disk mounting surface of the disk table and adjusting the position of the guide shaft so that the posture of the guide shaft becomes an optimum value. is there. In such a method based on the inclination of the guide shaft, since it is not necessary to detect the recording / reproducing state of the disk-shaped recording medium, the adjustment work can be performed without mounting the disk-shaped recording medium on the disk table, Adjustment work at the adjustment position can be performed from the side where the disk table exists (upper side).

JP 2005-63549 A

  However, in the skew adjustment method described in Patent Document 1 in which the recording / reproducing state of the disk-shaped recording medium is performed based on jitter, the adjustment operation for the adjustment position is performed from the side opposite to the side where the disk-shaped recording medium exists. Because it is necessary, a dedicated facility for adjustment must be provided, and adjustment work becomes large.

  Also, skew adjustment must be performed not only before product shipment but also during maintenance after shipment. In this case, due to the necessity of dedicated equipment, the product is temporarily collected and dedicated equipment exists. There is a problem that adjustment work must be performed at a maintenance center or the like, and adjustment work by a business trip service or the like cannot be performed.

  On the other hand, the skew adjustment method described above, which is performed by measuring the inclination of the guide shaft, requires a dedicated facility for measuring the inclination of the guide shaft, and is similar to the skew adjustment method performed based on jitter. In addition, there is a problem that adjustment work by a business trip service or the like cannot be performed.

  Therefore, an object of the skew adjustment mechanism in the disk drive device of the present invention is to facilitate skew adjustment.

The skew adjustment mechanism in the disk drive device of the present invention is arranged on the opposite side across the spindle motor, and has a moving base and an objective lens driving device supported on the moving base, and a pickup arrangement formed on the base chassis Two optical pickups that move in the radial direction of the disk-shaped recording medium mounted on the disk table in the hole, a pair of guide shafts that guide each optical pickup in the radial direction of the disk-shaped recording medium, and at least attached to the base chassis Two types of adjustment leaf springs that are individually provided at both ends of one guide shaft, individually hold each end portion, and bias the guide shaft in a predetermined direction, and two types of adjustment leaf springs two adjust the position of the guide shaft an elastic deformation amount is regulated and held to the adjustment plate spring, respectively An adjustment member, and an adjustment position by two types of adjustment members is provided outside the outer periphery of the disc-shaped recording medium mounted on the disc table.

  Therefore, in the skew adjustment mechanism in the disk drive device of the present invention, adjustment work for skew adjustment is performed from the outside of the outer periphery of the disk-shaped recording medium while the disk-shaped recording medium is rotating.

The skew adjustment mechanism in the disk drive apparatus of the present invention is a skew adjustment mechanism in a disk drive apparatus that records or reproduces an information signal on a disk-shaped recording medium that is mounted on a disk table and rotates as the spindle motor rotates. And a disc mounted on the disc table in a pickup arrangement hole formed in the base chassis, each having a moving base and an objective lens driving device supported on the moving base, and arranged on opposite sides of the spindle motor. two and optical pickup moves in the radial direction of the Jo recording medium, respectively each of the optical pickup and the pair of guide shafts for guiding the radial direction of the disc-shaped recording medium, the both end portions of at least one of the guide shafts is attached to the base chassis Provided separately for each Parts and two of the adjustment plate spring for urging the individually to retain the guide shaft in a predetermined direction, two guide shafts are held elastically deformed amount of the adjustment plate spring to adjust the adjusting plate spring, respectively and a two adjusting the position of the adjusting member, characterized in that provided outside the outer periphery of the two adjusting members by adjusting the position mounted on the disk table disc-shaped recording medium.

  Accordingly, the skew adjustment can be performed while detecting the recording / reproducing state while the disk-shaped recording medium is rotated from the side where the disk-shaped recording medium exists, and the adjustment work can be easily performed.

  According to the second aspect of the present invention, the adjusting plate spring includes a mounted portion that is attached to the base chassis, a spring portion that is elastically deformed continuously to the mounted portion, and a shaft that holds the guide shaft. A holding part and a connecting part that connects the spring part and the shaft holding part are provided, and the spring part and the connecting part are formed in a folded shape so that they are positioned in parallel, and the attached part is attached to the disk table. The folded portion between the spring portion and the connecting portion is positioned outside the outer periphery of the disk-shaped recording medium mounted on the disk table. Therefore, the entire length of the adjustment leaf spring can be shortened while the adjustment position is secured outside the outer periphery of the disk-shaped recording medium, and the disk drive device can be miniaturized.

  In the invention described in claim 3, the adjusting plate spring includes a positioning portion that is continuous with the attached portion and positioned with respect to the base chassis, and a spring portion that is continuously elastically deformed with the attached portion. Since the positioning part and the spring part are the same part, it is possible to avoid the problem that the positioning part rises with respect to the base chassis due to the deformation of the spring part. A good mounting position accuracy of the spring can always be ensured.

  The best mode for carrying out a skew adjustment mechanism in a disk drive apparatus according to the present invention will be described below with reference to the accompanying drawings.

  The disk drive device 1 is configured by arranging required members and mechanisms inside an outer casing 2 (see FIG. 1), and a disk insertion slot (not shown) is formed in the outer casing 2. The disk drive device 1 has a configuration in which one optical pickup is arranged on the opposite side across the spindle motor, and each component related to the two optical pickups is arranged in a symmetrical position with respect to the spindle motor. .

  Examples of such an apparatus having two optical pickups include an apparatus for the purpose of speeding up a reproduction operation and a recording operation, and an apparatus in which the two optical pickups are operated corresponding to different types of disc-shaped recording media. There is.

  Inside the outer casing 2, for example, a base chassis 3 formed in a substantially rectangular shape facing the vertical direction is disposed. The base chassis 3 is formed with a pickup arrangement hole 3a on the whole except for the outer peripheral portion.

  On the base chassis 3, circuit boards 4 and 4 are respectively arranged on both sides of the pickup arrangement hole 3a. Drive motors 5, 5 are fixed to the base chassis 3, and one end portions of the circuit boards 4, 4 are connected to the drive motors 5, 5.

  A mounting plate 6 is attached to the center portion of the base chassis 3. The mounting plate 6 is attached to the base chassis 3 so as to separate the pickup arrangement hole 3a into two parts having substantially the same size.

  A spindle motor 7 is fixed on the mounting plate 6, and a disk table 8 is fixed to the motor shaft of the spindle motor 7. A part of the circuit board 4 is connected to the spindle motor 7.

  Guide shaft holding plates 9, 9 are attached to the base chassis 3 along the opening edge of the optical pickup arrangement hole 3a. Guide shafts (main shafts) 10 and 10 are respectively held on the guide shaft holding plates 9 and 9, and the guide shafts 10 and 10 are positioned along the opening edge of the optical pickup arrangement hole 3a.

  First adjustment leaf springs 11 and 11 are attached to both ends of the base chassis 3 in the longitudinal direction, respectively.

  As shown in FIG. 2, the first adjustment leaf spring 11 includes a mounted portion 12, a positioning portion 13 projecting laterally from the mounted portion 12, and a direction different from the mounted portion 12 to the positioning portion 13. The spring portion 14 protruding to the side is integrally formed of a metal material having a spring property.

  The first adjustment leaf spring 11 is disposed on the lower surface side of the base chassis 3, and the attached portion 12 is attached to the base chassis 3 by appropriate means such as screwing. The first adjustment leaf spring 11 is disposed on the lower surface side opposite to the side on which the guide shaft 10 is disposed with the optical pickup arrangement hole 3a interposed therebetween (see FIG. 1).

  The positioning part 13 is a part for positioning with respect to the base chassis 3, and has a positioning hole 13a (see FIG. 2). The positioning portion 13 is positioned by inserting a positioning pin 3b protruding downward from the lower surface of the base chassis 3 into the positioning hole 13a, and is positioned along the outer peripheral portion of the base chassis 3.

  In the state where the first adjustment leaf spring 11 is attached to the base chassis 3 as described above, the tip of the spring portion 14 is positioned near the corner of the optical pickup arrangement hole 3a.

  One end portion 15 a of a guide shaft (secondary shaft) 15 is placed on the distal end portion of the spring portion 14 of the first adjustment leaf spring 11. The spring portion 14 can be elastically deformed so as to bend downward when the guide shaft 15 is placed, and the guide shaft 15 is held in a state of being biased upward by the spring portion 14.

  Holding members 16 and 16 are attached to the base chassis 3 so as to cover the guide shafts 15 and 15 from above. The pressing member 16 includes an adjustment plate portion 17 formed in a flat plate shape facing in the vertical direction, a pressing plate portion 18 protruding downward from a portion excluding a part of one side edge of the adjustment plate portion 17, and A thrust receiving portion 19 that protrudes downward from a part of one side edge of the adjustment plate portion 17, a connection plate portion 20 that protrudes downward from the other side edge of the adjustment plate portion 17, and the connection plate portion 20. The attached portion 21 that protrudes laterally from the lower edge is integrally formed.

  The adjustment plate portion 17 is formed with an adjustment hole 17a having a screw groove.

  The holding member 21 is attached to the base chassis 3 by an appropriate means such as a screwed attachment 21. In a state where the pressing member 16 is attached to the base chassis 3, the inner surface of the pressing plate portion 18 contacts the outer peripheral surface of the one end portion 15 a of the guide shaft 15 from the side, and the guide shaft 15 is pressed. At this time, one end surface of the guide shaft 15 in the axial direction comes into contact with the thrust receiving portion 19, and the guide shaft 15 is pressed in the axial direction.

  The adjustment member 22 is screwed into the adjustment hole 17 a formed in the adjustment plate portion 17 of the pressing member 16. The adjustment member 22 is, for example, a screw member.

  Second adjustment leaf springs 23, 23 are attached to the base chassis 3 (see FIG. 1).

  As shown in FIG. 3, the second adjustment leaf spring 23 includes a mounted portion 24, a positioning portion 25 projecting laterally from the mounted portion 24, and a direction different from the mounted portion 24 to the positioning portion 25. A metal material having a spring property in which the spring portion 26 protruding to the side, the connecting portion 27 provided continuously to the spring portion 26, and the shaft holding portion 28 provided continuously to the connecting portion 27 are provided. Are formed integrally.

  The second adjustment leaf spring 23 is disposed on the lower surface side of the base chassis 3, and the attached portion 24 is attached to the base chassis 3 by appropriate means such as screwing. The second adjustment leaf spring 23 is disposed at a position corresponding to the other end portion 15 b of the guide shaft 15.

  The positioning part 25 is a part for positioning with respect to the base chassis 3, and has a positioning hole 25a. The positioning portion 25 is positioned by inserting a positioning pin 3c protruding downward from the lower surface of the base chassis 3 into the positioning hole 25a.

  The spring portion 26 and the connecting portion 27 are provided so as to extend in the same direction, and both are configured in a folded shape so as to be positioned in a parallel state. The second adjustment leaf spring 23 is configured such that the folded portion of the spring portion 26 and the connecting portion 27 is positioned on the outermost peripheral side of the base chassis 3 (see FIG. 1).

  A holding groove 28a is formed in the shaft holding portion 28 (see FIG. 3). The shaft holding portion 28 is provided with a thrust receiving portion 28b formed by being bent downward.

  As for the 2nd adjustment leaf | plate spring 23, the positioning part 25 is located along the opening edge of the optical pick-up arrangement | positioning hole 3a, and the axial holding part 28 is located in the optical pick-up arrangement | positioning hole 3a.

  The other end portion 15b of the guide shaft 15 is inserted and held in the shaft holding groove 28a of the shaft holding portion 28 of the second adjusting plate spring 23, and the other end surface in the axial direction of the guide shaft 15 is the thrust receiving portion 28b. And is pressed in the axial direction. The spring portion 26 can be elastically deformed so as to bend downward when the guide shaft 15 is held, and the guide shaft 15 is held by the shaft holding portion 28 while being urged upward by the spring portion 26.

  On the shaft holding portions 28, 28, press plates 29, 29 for pressing the guide shafts 15, 15 from above are attached. The holding plate 29 is attached to the shaft holding portion 28 by screwing, for example.

  In the base chassis 3, an adjustment hole 3 d having a screw groove is formed in a portion of the spring portion 26 of the second adjustment plate spring 23 that exists above the end portion on the opposite side of the positioning portion 25. The adjustment member 30 is screwed into the adjustment hole 3d. The adjustment member 30 is, for example, a screw member.

  The adjustment hole 3d formed in the base chassis 3 together with the adjustment hole 17a of the pressing member 16 serves as an adjustment position when skew adjustment described later is performed. These adjustment positions are all provided on the disk table 8 in the disk-shaped recording medium. When the disc 100 is mounted, the disc-shaped recording medium 100 is positioned outside the outer periphery.

  The optical pickups 31, 31 are movably supported on the guide shafts 10, 10, 15, 15 arranged as described above (see FIG. 1). A part of the circuit boards 4 and 4 is connected to the optical pickups 31 and 31, respectively.

  The optical pickup 31 has a moving base 32, required optical components arranged on the moving base 32, and an objective lens driving device 33 supported on the moving base 32, and bearings provided at both ends of the moving base 32. The portions 32a and 32b are slidably supported on the guide shafts 10 and 10 and the guide shafts 15 and 15, respectively. The optical pickup 31 is guided by the guide shafts 10 and 15 by the driving force of the driving motor 5 and is moved in the radial direction of the disk-shaped recording medium 100, which is a direction in which the optical pickup 31 is separated from and contacting the disk table 8.

  In the disk drive device 1 configured as described above, when the disk table 8 is rotated in accordance with the rotation of the spindle motor 7, the disk-shaped recording medium 100 mounted on the disk table 8 is rotated. The optical pickup 31 is moved in the radial direction of the disc-shaped recording medium 100, and a recording operation or a reproducing operation is performed on the disc-shaped recording medium 100. At this time, focus adjustment and tracking adjustment are performed by the objective lens driving device 33, and laser light irradiated onto the disk-shaped recording medium 100 via the objective lens 33 a is condensed on the recording surface of the disk-shaped recording medium 100. The spot of the laser beam follows the recording track of the disc-shaped recording medium 100.

  In the disk drive device 1, the optical axis of laser light emitted toward the disk-shaped recording medium 100 through the objective lens 33 a is in a state perpendicular to the recording surface of the disk-shaped recording medium 100. Skew adjustment is performed.

  In the skew adjustment, the disc-shaped recording medium 100 is mounted on the disc table 8 and the position of the guide shaft 15 is adjusted so that the jitter becomes the optimum value while detecting the recording / reproducing state of the rotating disc-shaped recording medium 100 based on the jitter. Is done.

  The skew adjustment is first performed by rotating the adjustment member 22 with a jig (see FIGS. 4 and 5). Since the adjustment member 22 is located outside the outer periphery of the disc-shaped recording medium 100, the adjustment member 22 can be easily rotated from above using a jig.

  When the adjustment member 22 is rotated, the load applied to the guide shaft 15 in contact with the slope of the lower end portion of the adjustment member 22 is fluctuated by the adjustment member 22 being engaged or returned to the adjustment hole 17a. The amount of deformation of the spring portion 14 of the adjustment leaf spring 11 is changed. Accordingly, the one end portion 15 a side of the guide shaft 15 is moved substantially in the vertical direction, and the inclination in the tangential direction at the outer peripheral portion of the optical pickup 31 is adjusted.

  Next, adjustment is performed by rotating the adjustment member 30 with a jig (see FIGS. 6 and 7). Since the adjustment member 30 is located outside the outer periphery of the disc-shaped recording medium 100, the adjustment member 30 can be easily rotated from above using a jig.

  When the adjustment member 30 is rotated, the load applied to the spring portion 26 of the second adjustment plate spring 23 that is in contact with the front end of the adjustment member 30 by the adjustment member 30 being engaged or returned to the adjustment hole 3d. The amount of deformation of the spring portion 26 is changed. At this time, when the amount of deformation of the spring portion 26 increases, the spring portion 26 is deformed so as to be bent substantially downward, the shaft holding portion 28 and the guide shaft 15 held thereby are displaced upward, and conversely, the spring portion 26. When the deformation amount decreases, the spring portion 26 is deformed so as to return substantially upward, and the shaft holding portion 28 and the guide shaft 15 held thereby are displaced downward. Therefore, the other end 15 b side of the guide shaft 15 is moved substantially in the vertical direction, and the inclination in the tangential direction at the inner peripheral portion of the optical pickup 31 is adjusted.

  The skew adjustment described above can be performed in a case where a good position accuracy (tilt accuracy) of the guide shaft 10 with respect to the base chassis 3 is ensured, but a good position accuracy of the guide shaft 10 is ensured. Therefore, for example, an adjustment position using the first adjustment leaf spring 11 or the second adjustment leaf spring 23 is formed on one end portion side of the guide shaft 10, and adjustment work is performed with respect to this adjustment position. It is also possible to perform skew adjustment by performing.

  As described above, in the disk drive device 1, the adjustment position is provided outside the outer periphery of the disk-shaped recording medium 100 mounted on the disk table 8, so that the disk-shaped recording medium 100 exists from the side where the disk-shaped recording medium 100 exists. Skew adjustment can be performed while detecting the recording / reproducing state while the disk-shaped recording medium 100 is rotated, and adjustment work can be easily performed.

  In addition, since it is not necessary to perform skew adjustment from the side opposite to the side where the disk-shaped recording medium 100 exists, there is no need to provide a dedicated facility for adjustment, and adjustment work by a business trip service or the like at the time of maintenance after shipment. It can be performed.

  Further, since the second adjustment plate spring 23 is configured to be folded back in a state in which the spring portion 26 and the connecting portion 27 are parallel, the adjustment position is secured outside the outer periphery of the disk-shaped recording medium 100 by the amount of the folding. However, the overall length of the second adjustment leaf spring 23 can be shortened, and the disk drive device 1 can be downsized.

  In addition, since the positioning portions 13 and 25 and the spring portions 14 and 26 are separately provided in the first adjustment leaf spring 11 and the second adjustment leaf spring 23, respectively, the positioning portion and the spring portion are made the same part. In this case, it is possible to avoid the problem that the positioning portion is lifted with respect to the base chassis 3 due to the deformation of the spring portion, and the first adjustment plate spring 11 and the second adjustment plate spring 23 with respect to the base chassis 3 are avoided. It is possible to always ensure good mounting position accuracy.

  In the above, an example in which two optical pickups 31 and 31 are provided has been shown. However, the scope of application of the present invention is not limited to an apparatus having two optical pickups 31 and 31, and the present invention is The present invention can also be applied to an apparatus provided with three or more optical pickups.

  The specific shapes and structures of the respective parts shown in the above-described best mode are merely examples of the implementation of the present invention, and the technical scope of the present invention is limited by these. It should not be interpreted in a general way.

2 to 7 show the best mode of the present invention, and this figure is a schematic perspective view of a disk drive device. It is an expansion disassembled perspective view which shows the 1st adjustment leaf | plate spring and its peripheral member. It is an expansion exploded perspective view showing the 2nd leaf spring for adjustment, and its peripheral member. FIG. 5 shows a state of skew adjustment using the first adjustment leaf spring together with FIG. 5, and this figure is an enlarged sectional view showing a state before the spring portion is deformed. It is an expanded sectional view showing the state where a spring part was changed. FIG. 8 shows a state of skew adjustment using the second adjustment leaf spring together with FIG. 7, and this figure is an enlarged sectional view showing a state before the spring portion is deformed. It is an expanded sectional view showing the state where a spring part was changed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Disk drive apparatus, 3 ... Base chassis, 3a ... Pick-up arrangement | positioning hole, 7 ... Spindle motor, 8 ... Disk table, 10 ... Guide shaft, 11 ... 1st adjustment leaf | plate spring (adjustment leaf | plate spring), 15 ... Guide shaft (one guide cram school), 15a ... one end (end), 15b ... other end (end), 22 ... adjusting member, 23 ... second adjusting leaf spring (adjusting leaf spring), 24 DESCRIPTION OF SYMBOLS ... Attached part, 25 ... Positioning part, 26 ... Spring part, 27 ... Connection part, 28 ... Shaft holding part, 30 ... Adjustment member, 31 ... Optical pick-up, 32 ... Moving base, 33 ... Objective lens drive device, 100 ... Disc-shaped recording medium

Claims (3)

A skew adjustment mechanism in a disk drive device that records or reproduces an information signal with respect to a disk-shaped recording medium mounted on a disk table and rotated in accordance with rotation of a spindle motor,
A disc-shaped disc mounted on the disc table in a pickup placement hole formed in the base chassis, having a moving base and an objective lens driving device supported on the moving base , respectively, arranged on opposite sides of the spindle motor Two optical pickups moving in the radial direction of the recording medium;
A pair of guide shafts for guiding each optical pickup in the radial direction of the disk-shaped recording medium;
And two adjusting plate spring for urging the guide shaft individually hold the respective end portions each provided individually at both ends of at least one of the guide shaft mounted on the base chassis in a predetermined direction,
And a two adjusting member adjusting the position of the two types of elastic deformation of the adjusting plate spring is adjusted each guide shaft which is held in the adjustment plate spring,
A skew adjustment mechanism in a disk drive device, wherein an adjustment position by the two types of adjustment members is provided outside an outer periphery of a disk-shaped recording medium mounted on a disk table. A mounting portion attached to the base chassis, a spring portion that is continuously elastically deformed to the mounting portion, a shaft holding portion that holds the guide shaft, and a spring portion and a shaft holding portion. A connecting portion to be connected,
Both are configured in a folded shape so that the spring part and the connecting part are positioned in parallel,
The attached portion is positioned inside the outer periphery of the disc-shaped recording medium mounted on the disc table, and the folded portion between the spring portion and the connecting portion is the outer periphery of the disc-shaped recording medium mounted on the disc table. The skew adjustment mechanism in the disk drive device according to claim 1, wherein the skew adjustment mechanism is located on an outer side. The adjusting plate spring is provided with a positioning part that is continuous with the attached part and positioned with respect to the base chassis, and a spring part that is continuously elastically deformed with the attached part. 3. A skew adjustment mechanism in the disk drive device according to 2 .

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