JP2006216150A - Disk drive unit base and disk drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent plastic deformation of a guide main shaft caused by external impact while reducing the thickness of an optical pickup unit base. <P>SOLUTION: An optical disk drive device is disclosed in which an oil impregnated metal bearing 52 attached in the thickness T1 of an optical pickup unit base 50 is inserted freely slidably in an outer periphery of a guide main shaft 43 arranged at an optical disk drive unit 40, a shaft 48 for absorbing impact arranged at the optical disk drive unit base 40 in parallel to the guide main shaft 43 is inserted into a through hole 56 formed in the optical pickup unit base, and clearance 57 is provided between an inner peripheral surface 56a of the through hole 56 and a circumferential surface 48a of the shaft 48 for absorbing impact. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a disc for recording and / or reproducing information such as video information on an optical disc such as a CD, a CD-ROM, a CD-R / RW, a DVD, and a recordable DVD, a magneto-optical disc and other disc-shaped recording media. The present invention relates to a disk drive unit for a drive device and a disk drive device on which the disk drive unit is mounted.

  Conventionally, an optical disk drive device as an example of a disk drive device that records and / or reproduces video information on a disk-shaped recording medium such as an optical disk such as a CD, a CD-ROM, a CD-R / RW, a DVD, or a magneto-optical disk A loading / ejecting slide base that is taken in and out of the case (outer casing), and an optical disc drive unit that is elastically supported by a plurality of insulators in the opening of the slide base.

  Furthermore, the optical pickup unit has an optical pickup unit mounted in an opening of an optical disc drive unit base on which a spindle motor that rotates and drives an optical disk as a disk-shaped recording medium and an optical pickup unit feed mechanism are mounted. The unit is provided with an optical pickup unit base on which an optical pickup as a pickup means for recording and / or reproducing image information on an optical disk is mounted. The optical pickup unit base is a guide main shaft within an opening of the optical disk drive unit base. And guided by the guide auxiliary shaft and driven by the optical pickup unit feed mechanism, the optical pickup is moved in the radial direction of the optical disk, and the video signal is recorded on the optical disk. Beauty / or is configured to reproduce (e.g., Patent Documents 1 to 3).

In recent years, with the downsizing and thinning of notebook personal computers (abbreviations for personal computers) and the like, there has been a demand for further thinning of optical disk drive devices that are mounted so as to be incorporated into notebook personal computers.
In order to promote the thinning of the optical disk drive device, the thinning of the optical pickup unit base that is the base of the optical pickup unit is the most important.

  In an optical disk drive device, in order to increase the positioning accuracy of an optical pickup unit base, a cylindrical oil-impregnated metal is usually placed in a bearing press-fitting hole formed on the thickness center in one side of the optical pickup unit base. A structure is adopted in which the bearing is press-fitted and the oil-impregnated metal bearing is slidably inserted into the outer periphery of the guide main shaft that is horizontally installed in the opening of the disk drive unit base.

  Therefore, in order to reduce the thickness of the optical pickup unit base, it is necessary to change the diameter of the guide main shaft of the optical disk drive device corresponding to the optical disk having a diameter of 12 cm to a diameter sufficiently smaller than the current 2 cm.

Then, when the inventor of the present invention tried the following experiment in order to promote the thinning of the optical pickup unit base, the following problem occurred.
That is, in order to configure the thickness of the optical pickup unit base to be 3 mm, for example, when the oil-impregnated metal bearing is press-fitted onto the center of the thickness of the optical pickup unit base, the bearing press-fitting hole of the optical pickup unit base The thickness of the upper and lower portions of the optical pickup unit base must be at least 0.35 mm so that creep such as deformation or cracking does not occur in the upper and lower portions of the optical pickup unit.

  However, if the thickness of the upper and lower portions of the optical pickup unit base is set to 0.35, the minimum value of the thickness of the oil-impregnated metal bearing is 0.4 mm in strength. The diameter is at least 2.3 mm, and as a result, the guide main shaft has a very thin shaft diameter of 1.5 mm.

  At this time, since the diameter of the optical disk is small like the MD drive device, the length of the guide main shaft for guiding the optical pickup unit base can be shortened, and the weight of the optical pickup unit base itself is remarkably light. The diameter of the guide spindle can be set to 1.5 mm or less.

However, when the inventors of the present invention experimented, optical disc drive devices such as CDs, CD-ROMs, CD-R / RWs, DVDs, recordable DVDs and the like corresponding to optical discs having a diameter of 12 cm were compared with MD drive devices. In addition, since the length of the guide main shaft for guiding the optical pickup unit base is increased and the weight of the optical pickup unit base is increased, when the diameter of the guide main shaft is configured to be Φ = 1.5 mm, as will be described later. In addition, there has been a problem that the guide main shaft is plastically deformed by a drop experiment with a drop impact specification of the optical disk drive device.
JP 2001-325776 A JP 2004-6037 A JP 2004-132450 A

  The problem to be solved by the present invention is that, even if the diameter of the guide spindle is reduced to the maximum in order to reduce the thickness of the pickup unit base to the maximum, the plastic deformation of the guide spindle due to the drop impact of the disk drive device. It is a point that can be prevented.

  In the present invention, a disk drive unit base on which a spindle motor and a pickup unit feed mechanism for rotating a disk-shaped recording medium are mounted, and a pickup means for recording and / or reproducing information on the disk-shaped recording medium are mounted on the pickup unit base. A pickup unit in which a bearing attached to one side of the pickup unit base is slid in a radial direction of the disk-shaped recording medium along an outer periphery of a guide main shaft installed on the disk drive unit base; and a guide to the disk drive unit base. The pickup unit base has a small clearance in the direction perpendicular to the radial direction of the disk-shaped recording medium with respect to the shock absorption axis, and along the guide main axis. This It is characterized in that is configured to slide in the radial direction of the Jo recording medium.

  Further, in the present invention, in order to reliably prevent plastic deformation of the guide main shaft with respect to a wide range of drop impact directions of the disk drive device, the shock absorbing shaft is formed as a cylindrical shaft, and the shock absorbing shaft is formed on the pickup unit base. It is characterized in that it is inserted through a formed through hole made of a cylindrical hole while maintaining a minute clearance.

  The present invention also provides a pickup unit base having a thickness of about 3 mm, a guide main shaft diameter, and a shock absorbing shaft diameter so as to correspond to a disk drive device for recording and / or reproducing a disk-shaped recording medium having a diameter of 12 cm. Are about 1.5 mm, and the diameter of the through hole is about 2.1 mm.

  The pickup unit, the disk drive unit base and the disk drive device according to the present invention provide a guide spindle for reducing the thickness of the pickup unit base on which pickup means for recording and / or reproducing information on a disk-shaped recording medium is mounted to the maximum. Even if the diameter of the guide shaft is sufficiently small, the shock absorbing shaft is installed on the disk drive unit base in parallel with the guide main shaft, so even if a drop impact in a direction perpendicular to the axial direction of the guide main shaft is applied, Impact can be distributed to the guide main shaft and shock absorbing shaft, and plastic deformation of the guide main shaft can be prevented in advance, making it possible to achieve both ultra-thinness and impact resistance of the disk drive device. it can.

  In addition, the present invention provides a wide range of drop impact directions of the disk drive device by inserting a shock absorbing shaft formed of a cylindrical shaft into a through hole made of a cylindrical hole formed in the pickup unit base while maintaining a minute clearance. The shock absorbing shaft can reinforce the guide spindle, and the plastic deformation of the guide spindle in a wide range of drop impact directions of the disk drive device can be reliably prevented, improving safety and durability. To do.

  In the present invention, the thickness of the pickup unit base is about 3 mm, the diameter of the guide main shaft and the shock absorbing shaft is about 1.5 mm, and the diameter of the through hole of the guide main shaft of the pickup unit base is about 2.1 mm. Accordingly, it is possible to make the disk drive device for recording and / or reproducing a disk-shaped recording medium such as an optical disk having a diameter of 12 cm ultra thin.

  1 to 7, an embodiment 1 of an ultra-thin disk drive device of the present invention that is most suitable for application to a notebook personal computer or the like and that is compatible with an optical disk having a diameter of 12 cm will be described. To do.

  As will be described later, an ultra-thin optical disk drive device 1 that is an example of the disk drive device of the present invention includes an exterior 2 that is a flat and hollow casing, and an opening 2 a on one side of the exterior 2. A flat loading / ejecting slide base (hereinafter simply referred to as a slide base) 3 that is loaded and ejected in and out in the directions of arrows a and b which are horizontal directions. A flat optical disc drive unit 4 which is an example of a disc drive unit and a flat optical pickup unit 5 which is an example of a pickup unit are mounted on the top.

  The optical disk drive unit 4 includes a flat optical disk drive unit base 40 that is an example of a disk drive unit base, and the optical pickup unit 5 includes a flat optical pickup unit base 50 that is an example of a pickup unit base. The optical disc drive unit base 40 is provided with a guide main shaft 43, a guide sub shaft 44, and a reinforcing shock absorbing shaft 48.

  Here, FIG. 1 is a perspective view showing the entire optical disc drive apparatus 1, and FIGS. 2 and 3 are perspective views showing an optical disc drive unit 4 and an optical pickup unit 5 mounted on the slide base 3 of the optical disc drive apparatus 1. FIG. 4 is an enlarged perspective view of the optical pickup unit 5. 5 is a perspective view for explaining the relationship between the guide main shaft 43 and the shock absorbing shaft 48 installed in parallel to the optical disc drive unit base 40, and FIGS. 6 and 7 are front views of FIG.

  1 and FIG. 2, the outline of the entire optical disc drive apparatus 1 will be described. A loading mechanism (not shown) is accommodated in one side portion of the exterior 2, and the slide base 3 is mounted on the exterior by this loading mechanism. 2 is configured to be loaded and ejected in the direction of the arrows a and b from the opening 3a on one side portion.

  On the upper surface of the slide base 3 is an optical disk 6 which is an example of an optical disk such as a CD, a CD-ROM, a CD-R / RW, a DVD, a recordable DVD, a magneto-optical disk, and other various disk-shaped recording media. Thus, the optical disk 6 having a diameter of 12 cm can be accommodated horizontally, and a circular recess 30 is formed as a whole.

  At the bottom of the recess 30 of the slide base 3, an opening 31 is formed along the outer diameter of the optical disk drive unit 4 whose outer shape is formed in a polygonal shape with unequal sides, and an optical disk is formed in the opening 31. The drive unit 4 is mounted horizontally via a plurality of insulators 32 formed in a flat shape by an elastic material such as rubber.

  The turntable 41a of the spindle motor 41, which corresponds to the outer peripheral frame of the optical disc drive unit 4 and is vertically mounted on one end side of a flat optical disc drive unit base 40 formed in a polygonal shape with unequal sides, is a slide base 3. Is disposed upward in the center of the recess 7. The optical disk 6 is detachably mounted on the turntable 41a through the center hole 6a, is mounted horizontally, and is accommodated in the recess 30 of the slide base 3. An opening 42 formed in a polygonal shape with unequal sides is formed in series with the spindle motor 41 inside the optical disk drive unit base 40.

  The optical pickup unit 5 includes an optical pickup 51 as pickup means incorporated in a flat optical pickup unit base 50 whose outer shape is formed in a polygonal shape with unequal sides. The lens 51 a is disposed upward on the upper surface of the optical pickup unit base 50 at a position near the spindle motor 41. This optical pickup unit 5 is accommodated horizontally in an optical disk drive unit base 40 in an opening 42 that is widely opened in a lateral position of the spindle motor 41.

  The optical pickup unit base 50 is parallel to the inner sides of the both side portions 40a and 40b of the optical disc drive unit base 40, and is horizontally installed from the respective cylindrical shafts disposed at both side positions in the opening 42. It is configured to be slidable in the directions of arrows c and d, which are radial directions of the optical disk 6, by being guided by the guide main shaft 43 and the guide auxiliary shaft 44. The optical pickup unit base 50 is configured to be slid in the directions of arrows c and d by an optical pickup unit feed mechanism 45 which is an example of a pickup unit feed mechanism mounted on one side of the optical disc drive unit base 40. ing.

  Note that one side portion 50a of the optical pickup unit base 50 is slidably inserted into the outer periphery of a guide main shaft 43 formed of a cylindrical shaft by a cylindrical oil-impregnated metal bearing 52 described later. The side portion 50b is engaged with a substantially U-shaped engaging portion 53 so as to be slidable up and down on a guide auxiliary shaft 44 formed of a cylindrical shaft.

  The optical pickup unit feeding mechanism 45 is mounted on one side portion 40a of the optical disk drive unit base 40, and is accommodated within the thickness of the optical disk drive unit base 40. The gear train is driven by the spindle motor 45a. The lead screw 45c is a feed shaft that is rotationally driven through 45b, and the lead screw 45c is close to the lateral position of the guide main shaft 43 in parallel.

  An engagement element 54 attached to one side of the optical pickup unit base 50 is formed in a shape substantially similar to the teeth of the rack, and this engagement element 54 is laterally formed in the spiral groove 45d on the outer periphery of the lead screw 45c. It is engaged from the direction.

  Therefore, when the lead screw 45c is driven to rotate forward and backward by the spindle motor 45a via the gear train 45b, the optical pickup unit base 50 slides in the directions of the arrows c and d while being guided by the guide main shaft 43 and the guide auxiliary shaft 44. It is configured to be driven. The plurality of insulators 32 described above are mounted on the upper and lower opposing surfaces of the plurality of insulator support portions 46 formed on the outer peripheral portion of the optical disc drive unit base 40 so that the edge portion of the opening 30 of the slide base 3 is elastically viewed from above and below. It is comprised so that it may clamp.

  The ultra-thin optical disk drive device 1 of the present invention having the general structure as described above is used by being mounted by an exterior 2 in a slit of a notebook computer or the like. As shown in FIG. 1, the optical disk 6 is mounted horizontally on the turntable 41a of the spindle motor 41, and the slide base 3 is loaded into the exterior 2 from the direction of the arrow a by the loading mechanism.

  The spindle motor 41 rotates and drives the optical disk 6 in response to a disk recording / reproducing command signal from the computer, and the light beam is focused on the lower surface of the optical disk 6 by the objective lens 51a of the optical pickup 51. The optical pickup unit base 50 is sought and tracked in the directions of arrows c and d along the radial direction of the optical disk 6 by the optical pickup unit feed mechanism 45 so that video information and the like are recorded and reproduced on the optical disk 6. Has been.

  The optical disc drive apparatus 1 of the present invention is configured such that the optical pickup unit base 50 has a thickness T1 = 3 mm or less, the optical disc drive unit base 40 has a thickness T2 = 3 mm or less, and the slide base 3 has a thickness T3 = 6. By configuring it to be 5 mm or less, an ultra-thin optical disk drive device 1 having a thickness T4 of the outer casing 2 of 8 mm or less is configured.

  2 to 7, description will be given of a structure that realizes an ultra-thin optical disk drive device 1 according to the present invention and an improvement in impact resistance when dropped.

  That is, a bearing mounting portion 60 having a uniform step in the vertical direction is formed at the central portion in the thickness direction of the one side portion 50a of the optical pickup unit base 50, and the two cylindrical mounting portions are formed on the bearing mounting portion 60. The oil-impregnated metal bearing 52 can be attached to and detached from the center of the optical pickup unit base 50 with a thickness T10 at the bearing mounting portion 60 of the optical pickup unit base 50 by a mounting member 62 constituted by a leaf spring 61 and a plurality of mounting screws. Is installed from above and below.

  At that time, the two oil-impregnated metal bearings 52 are fitted into two attachment portions 62 a formed integrally with the attachment member 62 and are crimped to the bearing attachment portion 60, so that these two oil-impregnated metal bearings are provided. 52 is concentrically attached to one side 50a of the optical pickup unit base 50 with high accuracy. The two oil-impregnated metal bearings 52, the attachment member 62, and the attachment screw 63 are all accommodated in the thickness T10 of the optical pickup unit base 50. These two oil-impregnated metal bearings 52 are inserted on the outer periphery of the guide main shaft 43 of the optical disc drive unit base 40 so as to be slidable in the directions of arrows c and d.

  Here, as shown in FIG. 6, the diameter D1 of the guide main shaft 43 is configured to be D1 = 1.5 mm, which is a critical limit value, and the cylindrical oil-impregnated metal bearing 52 has a strong wall thickness t1. The limit value t1 = 0.4 mm, the outer diameter D2 = 2.3 mm, and the difference in thickness with respect to the oil-impregnated metal bearing 52 with the thickness T1 = 3 mm of the optical pickup unit base 50 is T1-D2 = 0.7 mm. As the attachment member 62, a leaf spring 61 made of a stainless steel plate having a thickness t2 = 0.35 mm or less is used. Incidentally, the diameter of the guide countershaft 44 is configured to be 2.0 mm to 1.5 mm.

  The engaging element 54 is also detachably attached to the lower surface side of the one side portion 50a of the optical pickup unit base 50 by means of an attaching member 62 comprising a plate spring 61 and an attaching screw 63. The mounting screws 63 are all accommodated in the thickness T10 of the optical pickup unit base 50.

  Next, an impact absorbing shaft 48 formed of a cylindrical shaft is installed in a horizontal and parallel position near the inner side of the guide main shaft 43 in the opening 42 of the optical disc drive unit base 40. Then, a through hole formed by a cylindrical hole penetrating in a horizontal direction parallel to the axial direction of the two oil-impregnated metal bearings 52 at a position inside the two oil-impregnated metal bearings 52 at one side portion 50a of the optical pickup unit base 50. The hole 56 is inserted into the outer periphery of the shock absorbing shaft 48 in a non-contact state.

  That is, the inner diameter D4 of the through hole 56 is slightly larger than the outer diameter D3 of the shock absorbing shaft 48, and an annular shape is formed between the outer peripheral surface of the shock absorbing shaft 48 and the inner peripheral surface of the through hole 56. The clearance (gap) 57 is formed. The material of the guide main shaft 43 and the shock absorbing shaft 48 is, for example, SUS420J2 (quenching).

  As shown in FIG. 6, the diameter D3 of the shock absorbing shaft 48 is set to about 1.5 mm, the inner diameter D4 of the through hole 56 is set to about 2.1 mm, and the thickness t3 of the clearance 57 is about It is configured to 0.3 mm. However, the diameter D3 of the shock absorbing shaft 48 can be configured to be 1.5 mm or more and 1.5 mm or less. Similarly, the inner diameter D4 of the through hole 56 is also configured to be 2.1 mm or more or 2.1 mm or less. It is also possible to configure the clearance thickness t3 to be 0.3 mm or more or 0.3 mm or less.

  As described above, in the optical disk drive device 1 of the present invention, the guide main shaft 43, the two oil-impregnated metal bearing 52 mounting members 62, the shock absorbing shaft 48, etc. are all within the thickness T1 = 3 mm of the optical pickup unit base 50. Therefore, the ultra-thin optical disk drive device 1 can be configured.

On the other hand, as shown in FIGS. 1 and 2, the optical disc drive unit 4 is elastically supported by a plurality of insulators 32 in the opening 31 of the slide base 3. When an external impact G is applied to the guide spindle 43 from a direction perpendicular to the axial direction, such as when the optical disc drive 1 is dropped, the very thin guide spindle 43 having a diameter D1 = 1.5 mm is plastically deformed ( There is a risk of breakage).
However, the optical disk drive device 1 of the present invention can prevent the guide main shaft 43 from being plastically deformed by the shock absorbing shaft 48 that is installed in parallel with the guide main shaft 43.

  That is, when the optical pickup unit base 50 is seeked and tracked in the directions of the arrows c and d along the guide main shaft 43 and the guide auxiliary shaft 44 by the optical pickup feeding mechanism 45, as shown in FIG. The base 50 is moved in a non-contact state with respect to the shock absorbing shaft 48 by the clearance 57 in the through hole 56.

  However, as shown in FIG. 7, an impact G such as when the optical disk drive 1 is dropped is applied to the guide main shaft 43 from a direction perpendicular to the axial direction, and the guide main shaft 43 has a clearance t = 0.3 mm in the direction of arrow e. When the inner surface 56a of the through hole 56 of the optical pickup unit base 50 is slightly bent by a considerable amount, the inner surface 56a of the shock absorbing shaft 48 collides with the outer surface 48a of the shock absorbing shaft 48, and the guide main shaft 43 is deformed beyond a certain value. Can be prevented.

  Here, with reference to FIGS. 8 to 10, simulation results regarding plastic deformation of the guide main shaft 43 with respect to an external impact G applied in a direction perpendicular to the guide main shaft 43 (direction of arrow e) of the optical disc drive apparatus 1 of the present invention will be described.

  First, FIG. 8A shows an impact transmission attenuation in which the optical pickup unit 5 is elastically supported through the optical disc drive unit 4 in the opening 31 of the slide base 3 of the optical disc drive apparatus 1 as described above. It is the graph which showed the amount of shrinkage (horizontal axis) with respect to the compression load (vertical axis) of insulator 32 which is rubber.

  Therefore, when the amount of shrinkage of the insulator 32 with respect to the external impact G in the direction of arrow e applied to the optical disc drive apparatus 1 is measured based on FIG. 8A, the external impact G is calculated as Duration 3 ms, Acceleration 2842 m / s ^ / s2. When the initial solid frequency Fo of the insulator 32 is 10 Hz, the mass of the optical disk drive unit 4 is 50 gf, and the mass of the optical pickup unit 5 is 15 gf, the insulator 32 after impact is affected by the rubber characteristics of the insulator 32 against the external impact G. Shrinkage amount is max. It was about 0.82 mm.

Next, in FIG. 8B, the horizontal axis represents the amount of contraction of the insulator 32, and the vertical axis represents the change in the solid frequency Fo of the insulator 32. Here, when the rubber shrinkage amount is 0.82 mm, the solid frequency Fo of the insulator 32 is about 75 Hz.
Therefore, when the external impact G is applied when the insulator 32 has a solid frequency Fo of 75 Hz, Acceleration 1933 m / s ^ 2 is applied to the optical disc drive unit 4. It becomes like 9.

  That is, in FIG. 9, the horizontal axis represents the amount of movement of the optical pickup unit 5 from the inner periphery to the outer periphery with respect to the optical disk 6, with 0 value indicating the inner and outer peripheral position and 20 value indicating the center position. Here, the guide main shaft 43 is made of SUS420J2 (quenched), has a length of 55 mm, and the distance between the oil-impregnated metal bearings 52 of the optical pickup unit 5 is 15 mm. As a result, the guide main shaft diameter is Φ1.5, and the allowable stress value for plastic deformation against bending (55 kgf / mm ^ 2) is just below the margin, and there is no margin at all. You can see that

  By the way, in the optical disk drive apparatus 1 of the present invention, as shown in FIG. 7, an external impact G in the direction of arrow e is applied, and the guide main shaft 43 slightly moves in the direction of arrow e by an amount corresponding to the clearance t = 0.3 mm. When bent, the inner peripheral surface 56a of the through hole 56 of the optical pickup unit base 50 is brought into contact with the outer peripheral surface 48a of the shock absorbing shaft 48 to prevent the guide main shaft 43 from being deformed more than a certain value. Since it has a function, as shown in FIG. 10, it can be seen that both the bending stress and the amount of deformation applied to the guide spindle 43 are greatly reduced.

  That is, when the guide main shaft 43 is bent about 5 mm by the external impact G, the inner peripheral surface 56a of the through hole 56 of the optical pickup unit base 50 collides with the outer peripheral surface 48a of the shock absorbing shaft 48, and the guide main shaft 43 The bending stress decreases momentarily, and then the bending stress of the guide main shaft 43 slightly increases, but the safe bending stress that is far from reaching 55 kgf / mm ^ 2, which is the allowable stress value of plastic deformation for bending, A great effect of securing the amount of deformation could be obtained.

  The guide sub-shaft 44 can be configured with a short shaft length (40 mm), so there is a sufficient margin even at Φ1.5. Further, with respect to the lateral drop, the shrinkage of the insulator 32 does not occur due to the external impact G, so there is no change in the initial Fo, and in the case of Fo10 Hz, even with a shaft diameter of Φ1.5, it can be satisfactorily satisfied.

As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments. Based on the technical idea of the present invention, various types of pickup means can be used as various types of pickup unit bases. The present invention can be applied to various disk drive devices that record and / or reproduce information on a disk by using an optical system, a magneto-optical system, or a magnetic system that are mounted and used.
Further, in the first embodiment, the shock absorbing shaft 48 is inserted into the through hole 56 formed on the one side portion 50a side of the optical pickup unit base 50 and arranged so as to be close to the guide main shaft 43 in parallel. The shock absorbing shaft 48 can be inserted into a through hole 56 formed on the other side 50b side of the optical pickup unit 50 and arranged so as to be close to the guide auxiliary shaft 44 in parallel.

It is a perspective view of the whole optical disk drive device to which the present invention is applied. It is the perspective view which showed the optical disk drive unit and optical pick-up unit of the optical disk drive apparatus same as the above. FIG. 3 is a perspective view similar to FIG. 2. FIG. 3 is a perspective view showing an optical pickup unit base of the optical disc drive apparatus same as above. FIG. 3 is an exploded perspective view of the main part showing the relationship between the optical pickup unit base, the guide main shaft, and the shock absorbing shaft. FIG. 6 is a front view of FIG. 5. FIG. 7 is a front view similar to FIG. 6, illustrating a loosening of the guide spindle due to an external impact. 3 is a graph showing the relationship between the compression load and the compression amount of the insulator and the relationship between the solid frequency of the insulator and the compression amount. 6 is a graph for explaining plastic deformation due to loosening of a guide main shaft due to external impact when an impact absorbing shaft is not provided. It is a graph explaining that the guide main shaft is prevented from being plastically deformed by an external impact by providing the shock absorbing shaft.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk drive device, 2 Exterior, 3 Loading / eject slide base, 4 Optical disk drive unit, 40 Optical disk drive unit base, 41 Spindle motor, 42 Opening part, 43 Guide spindle,
45 optical pickup unit feed mechanism, 45c lead screw,
45d lead screw helical groove, 48 shock absorbing shaft, 48a outer peripheral surface of shock absorbing shaft, 5 optical pickup unit, 50 optical pickup unit base, 51 optical pickup, 52 oil-impregnated metal bearing, 54 engaging element, 56 through hole, 56a Inner peripheral surface of through hole

Claims (6)

A disk drive unit base equipped with a spindle motor for rotating the disk-shaped recording medium and a pickup unit feeding mechanism;
Pickup means for recording and / or reproducing information on the disk-shaped recording medium is mounted on a pickup unit base, and a bearing attached to one side of the pickup unit base is an outer periphery of a guide main shaft installed on the disk drive unit base. A disk drive unit for a disk drive device comprising a pickup unit that is slid along the radial direction of the disk-shaped recording medium along
The disk drive unit base includes a shock absorbing shaft installed in parallel with the guide main shaft,
The pickup unit base slides in the radial direction of the disc-shaped recording medium along the guide main axis while maintaining at least a minute clearance in a direction perpendicular to the radial direction of the disc-shaped recording medium with respect to the shock absorbing shaft. A disk drive unit for a disk drive device, characterized by being configured to be moved. The shock absorbing shaft is formed as a cylindrical shaft, and the shock absorbing shaft is inserted into a through hole made of a cylindrical hole formed in the pickup unit base while maintaining the minute clearance. A disk drive unit for the disk drive device according to claim 1. The disc-shaped recording medium has a diameter of 12 cm,
The pickup unit base has a thickness of about 3 mm, a diameter of the guide main shaft and a diameter of the shock absorbing shaft are each about 1.5 mm, and a diameter of the through hole is about 2.1 mm. A disk drive unit for the disk drive device according to claim 2. A disk drive unit in which a spindle motor and a pickup unit feed mechanism for rotating a disk-shaped recording medium are mounted on a disk drive unit base elastically supported by a plurality of buffer insulators in an opening of a slide base for loading and ejecting; and
Pickup means for recording and / or reproducing information on the disk-shaped recording medium comprises a pickup unit mounted on a pickup unit base,
The pickup unit is supported in the opening of the disk drive unit base through a guide main shaft and a guide sub shaft so as to be movable in the radial direction of the disk-shaped recording medium, and the pickup unit is moved by the pickup unit feeding mechanism to the disk. In a disk drive device transported in the radial direction of a recording medium,
The disk drive unit base includes a shock absorbing shaft installed in parallel with the guide main shaft,
The pickup unit base slides in the radial direction of the disk-shaped recording medium along the guide main axis while maintaining at least a minute clearance in a direction perpendicular to the radial direction of the disk-shaped recording medium with respect to the shock absorbing shaft. A disk drive device configured to be moved. The shock absorbing shaft is formed as a cylindrical shaft, and the shock absorbing shaft is inserted into a through hole made of a cylindrical hole formed in the pickup unit base while maintaining the minute clearance. The disk drive device according to claim 4. The pickup unit base has a thickness of about 3 mm, a diameter of the guide main shaft and a diameter of the shock absorbing shaft are each about 1.5 mm, and a diameter of the through hole is about 2.1 mm. The disk drive device according to claim 5.

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