JP2007157224A - Disk unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk unit capable of reducing abrupt deterioration in initial characteristic during recording or reproduction of a signal by reducing a difference in progress of abrasion between a main bearing part and a sub bearing part. <P>SOLUTION: The disk unit is equipped with a main guide shaft 4 and a sub guide shaft 5 which are arranged on a traverse base 10 to be parallel to the moving direction of an optical pickup 3 and support the optical pickup 3 movably at positions mutually apart, and the sub guide shaft 5 is arranged obliquely to a direction orthogonal to the shaft direction of the main guide shaft 4 and the rotary axis direction of a turntable 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a disk device called a CD or DVD for reproducing and recording an optical disk such as a compact disk or a video disk.

  FIG. 7 is a plan view showing a schematic configuration of a conventional disk device. FIG. 8 is a side view showing the optical pickup as viewed from the direction of arrow A in FIG.

  7 and 8, the disk device 1 includes a turntable 2, an optical pickup 3, guide shafts 4 and 5, and a drive mechanism 6.

  The turntable 2 is rotatably supported by a support shaft 2a connected to a motor (not shown), and has a configuration in which an optical disk 7 can be placed on the main surface. The optical disk 7 placed on the turntable 2 is held between the turntable 2 and a clamper (not shown).

  The optical pickup 3 is provided with an objective lens 3e capable of irradiating light (optical axis 3c) on the information surface of the optical disc 7, and stores various information signals such as video and audio on the optical disc 7 or records them on the optical disc 7. Various information signals being read can be read out.

  Further, the optical pickup 3 has a bearing portion 3a that supports the one end of the optical pickup 3 so that the main guide shaft 4 is inserted, and a guide shaft 5 that is engaged with the optical pickup 3. And a bearing portion 3b that supports the end in a movable manner. As shown in FIG. 8, the bearing portion 3 a is configured by a substantially circular hole, and has an inner diameter that prevents play as much as possible between the main guide shaft 4 and the main guide shaft 4 when the main guide shaft 4 is inserted. It is configured. Further, the bearing portion 3b is configured by a substantially U-shaped groove, and when the guide shaft 5 is engaged, an inner diameter (up and down) that prevents vertical play between the guide shaft 5 and the guide shaft 5 is minimized. (Inner diameter in the direction).

  The optical pickup 3 includes a rack portion 3f substantially parallel to the main guide shaft 4 and meshes with the driving mechanism 6 so that the optical pickup 3 is driven by a driving force transmitted from a driving source such as a motor (not shown). 3 can be moved in the radial direction of the disk 7 (arrow B or C direction).

  The main guide shaft 4 is arranged in parallel to the moving direction (arrow B or C direction) of the optical pickup 3 and supports the optical pickup 3 so as to be movable. Further, the end portions 4a and 4b of the main guide shaft 4 are fixed to the traverse base 10 so that the main guide shaft 4 is parallel to the moving direction (arrow B or C direction) of the optical pickup 3. . In this configuration, the main guide shaft 4 has a cylindrical shape, but may have other shapes as long as at least the optical pickup 3 can be guided and supported in a movable manner.

  The guide shaft 5 is arranged in parallel to the moving direction (arrow B or C direction) of the optical pickup 3 and supports the optical pickup 3 so as to be movable. Further, the end portions 5a and 5b of the guide shaft 5 are fixed to the traverse base 10 so that the guide shaft 5 is parallel to the moving direction of the optical pickup 3 (arrow B or C direction). In this configuration, the guide shaft 5 has a cylindrical shape, but may have other shapes as long as at least the optical pickup 3 can be guided and supported in a movable manner.

  Of the two guide shafts 4 and 5 that are parallel to each other, one is called the main guide shaft 4 and is a through-hole-shaped bearing portion 3a (hereinafter referred to as a main bearing) provided at two locations in the scanning direction of the optical pickup. And the other one is called a sub-guide shaft 5 and engages with a U-shaped groove-shaped bearing portion 3b (hereinafter referred to as a sub-bearing portion) provided at one location of the optical pickup 3. The sliding portion between the auxiliary guide shaft 5 and the auxiliary bearing portion 3b is 3d, and the optical pickup 3 is supported and guided by the two guide shafts 4 and 5.

  The driving mechanism 6 transmits a driving force transmitted from a driving source such as a motor (not shown) to the rack portion 3 f of the optical pickup 3. Although only one gear is shown in FIG. 7, the drive mechanism 6 is actually composed of a plurality of gears and the like, and is not shown.

  The traverse base 10 has an opening 10a formed of a recess or a hole on the main surface, and the turntable 2, the optical pickup 3 and the like are disposed in the opening 10a. Although not shown, the traverse base 10 is fixed to the chassis or supported so as to be movable or rotatable with respect to the chassis.

  The turntable 2 and the optical pickup 3 are arranged so that the recording surface 7a of the optical disc 7 and the optical axis 3c of the optical pickup 3 are orthogonal to each other.

  The operation will be described below.

  The optical disk 7 loaded in the disk device 1 is held by the turntable 2 in the vicinity of the center thereof, and the optical disk 7 is also rotated in the arrow D direction when the turntable 2 rotates in the arrow D direction.

When accessing the information surface of the optical disk 7, the driving force from a driving source such as a motor is transmitted to the driving mechanism 6. Since the drive mechanism 6 meshes with the rack portion 3f of the optical pickup 3, when the drive mechanism 6 is rotated in the clockwise direction in the figure, the optical pickup 3 moves in the arrow B direction, and the drive mechanism 6 is in the figure. When rotated counterclockwise, the optical pickup 3 moves in the direction of arrow C. The optical pickup 3 is guided by the guide shafts 4 and 5 and moves in the radial direction of the disk 7 (see, for example, Patent Document 1).
JP 2004-187571 A

  However, in the above conventional configuration, when the optical pickup 3 is moved in the radial direction of the optical disk 7, there is a possibility that the inner wall of the bearing portion is worn due to friction caused by sliding between the bearing portion and the guide shaft. In particular, the sliding portion between the auxiliary bearing portion 3d and the auxiliary guide shaft 5 has a small contact area, so that the pressure is concentrated and the inner wall of the auxiliary bearing portion 3d is significantly worn.

  That is, the wear of the bearing portion due to sliding is a combination of a circular hole and a cylindrical shaft (that is, surface contact), and compared with the main bearing portion 3a provided on the main guide shaft 4 at two locations, the U-shaped groove shape and the cylindrical shaft The sub-bearing portion 3b provided at one location on the sub-guide shaft 5 with the combination (that is, line contact) is faster.

  As the wear of the auxiliary bearing portion 3b proceeds, as shown in FIG. 9, the auxiliary guide shaft 5 is buried in the inner wall of the auxiliary bearing portion 3b, and the optical pickup 3 is tilted around the main guide shaft 4. In FIG. 9, a line 11b connecting the center of the main bearing portion 3a and the sub-bearing portion 3b to the line 11a connecting the center of the main guide shaft 4 and the sub-guide shaft 5 (regular position of the optical pickup 3) is t1 minutes. Tilt.

  When the optical pickup 3 is tilted, the optical axis 3c of the optical pickup 3 is similarly tilted by t1 in the circumferential direction of the optical disc 7 with respect to the optical axis 3s at the normal position. Therefore, there arises a problem that initial characteristics at the time of signal recording / reproduction by the disk device are deteriorated.

  In view of the above problems, the present invention provides a disk device that can reduce the rapid deterioration of initial characteristics during signal recording / reproduction by reducing the difference in progress of wear between the main bearing portion and the sub-bearing portion. The purpose is to provide.

  In order to solve the above problems, a disk device having a first configuration according to the present invention is a disk device that rotates a disk-shaped medium and transmits / receives a signal to / from an information layer of the disk-shaped medium. A turntable disposed on the base and configured to hold and rotate the disk-shaped medium, and light that is movable in the radial direction of the disk-shaped medium in a plane parallel to the information layer of the disk-shaped medium. A first guide shaft and a second guide shaft, which are arranged on the base so as to be parallel to the moving direction of the optical pickup and movably support the optical pickup at positions separated from each other; A drive mechanism for moving the optical pickup in a radial direction of the disk-shaped medium, and the second guide shaft is disposed to be inclined with respect to the first guide shaft, and has an outer peripheral surface. Up and down only to guide the optical pickup.

  A disk device having a second configuration according to the present invention is a disk device that rotates a disk-shaped medium and transmits / receives signals to / from an information layer of the disk-shaped medium, and is arranged on a base and the base. And an optical pickup arranged to be movable in the radial direction of the disk-shaped medium within a range parallel to the information layer of the disk-shaped medium, and a turntable for holding and rotating the disk-shaped medium And a first guide shaft and a second guide shaft which are arranged on the base so as to be parallel to the moving direction of the optical pickup and which movably support the optical pickup at positions separated from each other, A drive mechanism for moving the optical pickup in a radial direction of the disk-shaped medium, and the second guide shaft is rotated in the axial direction of the first guide shaft and the turntable. It includes a bent portion bent in a direction orthogonal to the direction, for guiding the optical pickup only above and below the outer peripheral surface.

  According to the disk device of the present invention, it is possible to slow down wear in one of the bearing portions when the optical pickup is moved. Therefore, the change in the inclination of the recording surface of the optical disc and the optical axis of the optical pickup can be reduced, and the deterioration of the initial characteristics that progress with use time can be delayed.

  In the disk device of the second configuration of the present invention, the second guide shaft includes a bent portion bent in a direction orthogonal to the axial direction of the first guide shaft and the rotation axis direction of the turntable, Only a portion on the inner peripheral side of the disc-shaped medium from the bent portion may be inclined with respect to the first guide shaft.

  In the disk device having the second configuration, the bending portion may be provided at a plurality of locations of the second guide shaft.

  In the disk device having the first or second configuration, the optical pickup includes two through holes on a straight line and a substantially U-shaped groove-shaped bearing portion that is not collinear with the two through holes. It is good also as a structure with which the said through-hole is supported by the said 1st guide shaft and the said bearing part is supported by the said 2nd guide shaft.

  Further, in the disk device having the first and second configurations, the first guide shaft may be configured as a linear axis, and the second guide shaft may be configured as a curved axis.

  Further, in the disk device having the first and second configurations, the second guide shaft may be configured by a single shaft combined with a curve and a straight line.

(Embodiment 1)
FIG. 1 is a plan view showing a schematic configuration of the disk device according to the first embodiment. FIG. 2 is a side view showing the optical pickup as viewed from the direction of arrow A in FIG.

  1 and 2, a turntable 2, an optical pickup 3, guide shafts 4 and 5, and a drive mechanism 6 are provided on a traverse base (base) 10 constituting the disk device.

  The turntable 2 is rotatably supported by a support shaft 2a connected to a motor (not shown), and has a configuration in which an optical disk 7 can be placed on the main surface. The optical disk 7 placed on the turntable 2 is held between the turntable 2 and a clamper (not shown).

  The optical pickup 3 is provided with an objective lens 3e capable of irradiating light (optical axis 3c) on the information surface of the optical disc 7, and stores various information signals such as video and audio on the optical disc 7 or records them on the optical disc 7. Various information signals being read can be read out.

  Further, in the optical pickup 3, the main guide shaft 4 is inserted, and the main bearing portion 3a that movably supports one end of the optical pickup 3 and the sub guide shaft 5 are slidably engaged. And an auxiliary bearing portion 3b that movably supports the other end of the optical pickup 3. As shown in FIG. 2, the main bearing portion 3 a is configured by a substantially circular hole, and when the main guide shaft 4 is inserted, the inner diameter is such that no play is generated between the main guide shaft 4 and the main guide shaft 4. It consists of Further, the sub-bearing portion 3b is configured by a substantially U-shaped groove so that when the sub-guide shaft 5 is engaged, vertical play is not generated between the sub-guide shaft 5 as much as possible. It consists of an inner diameter (inner diameter in the vertical direction). That is, when the optical pickup 3 moves, the main guide shaft 4 and the main bearing portion 3a slide with each other, and the sub guide shaft 5 and the sub bearing portion 3b slide with each other.

  The optical pickup 3 includes a rack portion 3f substantially parallel to the main guide shaft 4 and meshes with the driving mechanism 6 so that the optical pickup 3 is driven by a driving force transmitted from a driving source such as a motor (not shown). 3 can be moved in the radial direction of the disk 7 (arrow B or C direction).

  The main guide shaft 4 (first guide shaft) is arranged in parallel to the moving direction (arrow B or C direction) of the optical pickup 3 and supports the optical pickup 3 so as to be movable. Further, the end portions 4 a and 4 b of the main guide shaft 4 are fixed to the traverse base 10, respectively. In this configuration, the main guide shaft 4 has a cylindrical shape, but may have other shapes as long as at least the optical pickup 3 can be guided and supported in a movable manner.

  As shown in FIG. 1, the auxiliary guide shaft 5 (second guide shaft) is disposed so as to be inclined in the horizontal direction with respect to the movement direction (arrow B or C direction) of the optical pickup 3 or the main guide shaft 4. ing. With this arrangement, when the optical pickup 3 moves in the direction of arrow B or C, the sliding portion between the sub guide shaft 5 and the sub bearing portion 3b is within the range of the sliding portion 3d shown in FIG. It can be displaced. Therefore, in the auxiliary bearing portion 3b, the pressure due to sliding does not concentrate in one place, and uneven wear can be prevented.

  Further, the inclination angle of the auxiliary guide shaft 5 does not hinder the moving operation when the optical pickup 3 moves to the innermost circumference of the disk 7 (position closest to the turntable 2 in FIG. 1), and the optical pickup 3 The angle is set such that the auxiliary guide shaft 5 and the auxiliary bearing portion 3b do not separate when moving to the outermost periphery of the disk 7. That is, if the inclination angle of the auxiliary guide shaft 5 is too large, when the optical pickup 3 moves in the inner circumferential direction of the disk, the U-shaped bottom portion of the auxiliary bearing portion 3b and the auxiliary guide shaft 5 come into contact with each other and smooth movement is achieved. In addition, there is a possibility that the sub guide shaft 5 and the sub bearing portion 3b are detached when the optical pickup 3 moves in the disk outer peripheral direction. In this configuration, the auxiliary guide shaft 5 has a cylindrical shape, but may have other shapes as long as at least the optical pickup 3 can be guided and supported movably.

  Further, the sub guide shaft 5 has ends 5 a and 5 b which are both ends in the longitudinal direction fixed to the traverse base 10. As described above, since the auxiliary guide shaft 5 is disposed so as to be inclined in the horizontal direction with respect to the main guide shaft 4, the end portions 5a and 5b are in positions shifted in the horizontal direction as shown in FIG. .

  The driving mechanism 6 transmits a driving force transmitted from a driving source such as a motor (not shown) to the rack portion 3 f of the optical pickup 3. Although only one gear is shown in FIG. 1, the drive mechanism 6 is actually composed of a plurality of gears and the like, and is not shown.

  The traverse base 10 has an opening 10a formed of a recess or a hole on the main surface, and the turntable 2, the optical pickup 3 and the like are disposed in the opening 10a. Although not shown, the traverse base 10 is fixed to the chassis or supported so as to be movable or rotatable with respect to the chassis.

  The turntable 2 and the optical pickup 3 are arranged so that the recording surface 7a of the optical disc 7 and the optical axis 3c of the optical pickup 3 are orthogonal to each other.

  The operation will be described below.

  The optical disk 7 loaded in the disk device 1 is held by the turntable 2 in the vicinity of the center thereof, and the optical disk 7 is also rotated in the arrow D direction when the turntable 2 rotates in the arrow D direction.

  When accessing the information surface of the optical disk 7, the driving force from a driving source such as a motor is transmitted to the driving mechanism 6. Since the drive mechanism 6 meshes with the rack portion 3f of the optical pickup 3, when the drive mechanism 6 is rotated in the clockwise direction in the figure, the optical pickup 3 moves in the arrow B direction, and the drive mechanism 6 is in the figure. When rotated counterclockwise, the optical pickup 3 moves in the direction of arrow C. The optical pickup 3 is guided by the main guide shaft 4 and the sub guide shaft 5 and moved in the radial direction of the disk 7.

  Next, the sliding operation on the sub guide shaft 5 will be described in detail.

  As shown in FIG. 1, when the sub guide shaft 5 is inclined in the horizontal direction with respect to the main guide shaft 4, a sliding portion of the sub bearing portion 3 b with the sub guide shaft 5 is arranged so that the optical pickup 3 has a radius of the optical disk 7. As it moves in the direction, it is displaced within a predetermined range (range indicated by the sliding portion 3d).

  In general, the wear caused by sliding between the moving body and the fixed body causes the sliding portion to move in a direction different from the moving direction of the moving body, rather than the sliding portions concentrating at the same point in the moving range of the moving body. It is harder to wear. In the disk device as described above, the sliding portion of the sub-bearing portion 3b of the optical pickup 3 (moving body) with the sub-guide shaft 5 (fixed body) moves along the sliding portion 3d as the optical pickup 3 moves. Therefore, the uneven wear due to sliding can be prevented, and the progress of wear of the auxiliary bearing portion 3b can be delayed.

  Therefore, the difference in the amount of wear with the main bearing portion 3a is reduced, the change in the inclination between the recording surface 7a of the optical disc 7 and the optical axis 3c of the optical pickup 3 is reduced, and the deterioration of the initial characteristics that progress with use time is delayed. be able to.

  In the configuration shown in FIG. 1, the auxiliary guide shaft 5 is disposed so that the side close to the turntable 2 (the inner side of the disk) is inclined in a direction approaching the main guide shaft 4, but is far from the turntable 2. The side (disc outer peripheral side) may be arranged so as to be inclined in a direction approaching the main guide shaft 4.

(Embodiment 2)
3 and 4 are plan views showing the configuration of the disk device according to the second embodiment.

  3 and 4, the same reference numerals are given to the same components as those in FIG. 1, and description thereof is omitted.

  The sub-guide shaft 5 shown in FIG. 3 is configured such that the inclination angle in the horizontal direction with respect to the main guide shaft 4 increases as it approaches the turntable 2 (that is, the inner periphery of the disk 7).

  In the configuration of the first embodiment described above, when a small-diameter disk is often used and the scanning range in the disk radial direction of the optical pickup 3 is biased toward the inner periphery of the optical disk 7, the sliding between the auxiliary guide shaft 5 and the auxiliary bearing portion 3b is performed. The moving range is about half of the area indicated by the sliding portion 3d in FIG. Therefore, wear is concentrated in a region that is about half of the region of the sliding portion 3d shown in FIG.

  In the configuration of the second embodiment, as shown in FIG. 3, the inclination of the sub guide shaft 5 with respect to the main guide shaft 4 is configured by a curve that is larger in the inner peripheral portion of the optical disc 7 than in the outer peripheral portion. Therefore, even if the scanning range of the optical pickup 3 in the radial direction of the disk is biased toward the inner periphery of the optical disk 7, the sliding range of the auxiliary guide shaft 5 and the auxiliary bearing portion 3b during the inner periphery scanning of the optical disk is as shown in FIG. It becomes an area | region shown by the moving part 3d, and the partial wear of the subbearing part 3b can be reduced.

  As described above, according to the present embodiment, the horizontal inclination angle of the auxiliary guide shaft 5 is made larger in the vicinity of the inner peripheral portion than in the outer peripheral portion of the disc 7, so that the optical pickup 3 is scanned in the disc radial direction. Even when the range is biased toward the inner periphery of the optical disc 7, uneven wear of the auxiliary bearing portion 3b can be reduced. In particular, it is useful for a disk device that mainly uses a small-diameter disk such as a disk having a diameter of 8 cm.

  In FIG. 3, the auxiliary guide shaft 5 is configured such that the inclination angle increases as it approaches the inner periphery of the disk, but may be configured such that the inclination angle increases as it approaches the outer periphery of the disk. The configuration is shown in FIG.

  FIG. 4 shows the shape of the auxiliary guide shaft 5 when the scanning range in the radial direction of the optical disc 7 of the optical pickup 3 is biased toward the outer periphery, and the inclination of the auxiliary guide shaft 5 with respect to the main guide shaft is as follows. It is comprised by the curve which becomes larger than an inner peripheral part.

  3 and 4, the auxiliary guide shaft 5 is configured with a curved line, but a plurality of straight lines may be configured with a predetermined angle. For example, it may be formed in a substantially “<” character shape.

  Further, as shown in FIG. 5, the inclination angle of the auxiliary guide shaft 5 in the vicinity of the inner periphery and the outer periphery of the disk may be made larger than the inclination angle in the central portion 51 between the vicinity of the inner periphery and the vicinity of the outer periphery. Good. With this configuration, when the radial scanning range of the optical disk 7 of the optical pickup 3 is biased to the vicinity of the inner periphery and the vicinity of the outer periphery of the disk 7, it is possible to reduce uneven wear of the auxiliary bearing portion 3b. it can.

  Further, as shown in FIG. 6, the inclination angle of the auxiliary guide shaft 5 in the vicinity of the inner periphery and the outer periphery of the disk may be smaller than the inclination angle in the central portion 51 between the vicinity of the inner periphery and the vicinity of the outer periphery. Good. With this configuration, when the scanning range in the radial direction of the optical disc 7 of the optical pickup 3 is biased near the central portion 51 of the disc 7, uneven wear of the auxiliary bearing portion 3b can be reduced.

  The disk device of the present invention is useful for a disk device equipped with a mechanism for moving the optical pickup in the disk radial direction, for example.

FIG. 2 is a plan view showing the configuration of the disk device according to the first embodiment of the present invention. Side view showing the configuration of the optical pickup according to the first embodiment. FIG. 5 is a plan view showing the configuration of a disk device in the second embodiment FIG. 5 is a plan view showing the configuration of a disk device in the second embodiment FIG. 3 is a plan view showing a configuration of a disk device according to a second embodiment. FIG. 5 is a plan view showing the configuration of a disk device in the second embodiment Plan view showing the configuration of a conventional disk device Side view showing the configuration of a conventional disk device Side view showing the configuration of a conventional disk device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disk apparatus 2 Turntable 3 Optical pick-up 3a Main bearing part 3b Sub bearing part 3c Optical axis 3d Sliding part 3e Objective lens 3f Rack part 4 Main guide shaft 4a, 4b End part 5 Sub guide shaft 5a, 5b End part 6 Drive Mechanism 7 Optical disc

Claims (7)

A disk device that rotates a disk-shaped medium and transmits / receives a signal to / from an information layer of the disk-shaped medium,
The base,
A turntable arranged on the base and holding and rotating the disc-shaped medium;
An optical pickup that is movable in a radial direction of the disk-shaped medium in a plane parallel to the information layer of the disk-shaped medium;
First and second guide shafts arranged on the base so as to be parallel to the moving direction of the optical pickup and movably supporting the optical pickup at positions separated from each other;
A drive mechanism for moving the optical pickup in a radial direction of the disc-shaped medium,
The disk apparatus according to claim 1, wherein the second guide shaft is disposed to be inclined with respect to the first guide shaft, and guides the optical pickup only above and below the outer peripheral surface. A disk device that rotates a disk-shaped medium and transmits / receives a signal to / from an information layer of the disk-shaped medium,
The base,
A turntable that is arranged on the base and rotates while holding the disk-shaped medium;
An optical pickup that is arranged to be movable in the radial direction of the disk-shaped medium within a range parallel to the information layer of the disk-shaped medium;
First and second guide shafts arranged on the base so as to be parallel to the moving direction of the optical pickup and movably supporting the optical pickup at positions separated from each other;
A drive mechanism for moving the optical pickup in a radial direction of the disc-shaped medium,
The second guide shaft includes a bent portion that is bent in a direction perpendicular to the axial direction of the first guide shaft and the rotational axis direction of the turntable, and guides the optical pickup only above and below the outer peripheral surface. A disk device characterized by: The second guide shaft includes a bent portion that is bent in a direction perpendicular to the axial direction of the first guide shaft and the rotational axis direction of the turntable,
3. The disk device according to claim 2, wherein only a portion on an inner peripheral side of the disk-shaped medium from the bent portion is inclined with respect to the first guide shaft.   The disk device according to claim 2, wherein the bent portion is provided at a plurality of locations of the second guide shaft. The optical pickup includes two through holes on a straight line and a substantially U-shaped groove-shaped bearing portion that is not collinear with the two through holes,
The disk device according to claim 1, wherein the through hole is supported by the first guide shaft, and the bearing portion is supported by the second guide shaft.   3. The disk device according to claim 2, wherein the first guide shaft is constituted by a linear axis, and the second guide shaft is constituted by a curved axis.   3. The disk device according to claim 2, wherein the second guide shaft is constituted by a single shaft combined with a curve and a straight line.

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