KR101233518B1 - Adjustment method of normal line direction of base plate - Google Patents

Abstract

This invention WHEREIN: In the method of adjusting the normal orientation of a board | substrate, the center position of the said predetermined area | region is made according to the direction which changes the said normal orientation in the position which irradiates the said pulse laser in the predetermined area | region which irradiates a pulse laser, and is multiple. The amount of changing the normal orientation is determined by increasing or decreasing the number of locations irradiated with the pulse laser in the predetermined area, and the distribution density of the locations irradiated with the pulse laser is determined by When the location is increased, the height is increased, and when the location to be irradiated is decreased, the value is decreased, and the oscillation conditions of the pulse laser are substantially constant regardless of the direction and the amount of changing the normal orientation. A method for adjusting normal orientation.

Description

ADJUSTMENT METHOD OF NORMAL LINE DIRECTION OF BASE PLATE}

The present invention relates to a method for adjusting the normal orientation of a substrate.

This invention is a method of adjusting the normal orientation of the predetermined area | region of a board | substrate, The background art is demonstrated by giving the example which can apply this method concretely.

In recent years, thinning of disk drive apparatuses, such as a CD, a DVD, and HDD, is progressing. In connection with this, the spindle motor which comprises a disk drive apparatus also becomes thinner. In addition, with the higher capacity of the disc, the recording density of the disc is increasing. For this reason, even when the angle and position of the optical pickup unit of the optical pickup unit and the disc recording surface or reproduction surface (hereinafter referred to as R / P surface) are slightly shifted, the recording or reproduction An error may occur (hereinafter referred to as R / P).

Therefore, the angle between the light emitting direction of the optical pickup unit and the rotational axis of the spindle motor is adjusted so that the angle between the light emitting direction of the optical pickup unit and the recording surface of the disk is at right angles. ) Adjustment.

For example, Japanese Patent Laid-Open No. 2002-373485 discloses a laser forming process for irradiating a laser beam to a proper position of a fixed frame in order to easily and accurately repair the parallelism of the disk mounting surface.

In addition, Japanese Laid-Open Patent Publication No. 2000-094164 discloses a method for adjusting the tilt of an axis such as a motor. This is the method of adjusting the inclination of an axis by the plastic deformation at that time by irradiating a laser beam, heating, melting, and cooling to the vicinity of the mounting base of the axis | shaft attached to the support base.

Japanese Laid-Open Patent Publication No. 2007-317272 discloses a motor whose relative position is adjusted by heating and deforming a heated region set on the outer circumference of the substantially flat displacement portion provided on the base portion.

Japanese Patent Laid-Open No. 2002-373485 Japanese Patent Laid-Open No. 2000-094164 Japanese Patent Laid-Open No. 2007-317272

However, in the skew adjustment disclosed in Japanese Unexamined Patent Publication No. 2002-373485, the amount of displacement may be uneven depending on the angle range of the irradiation area in the irradiation of the laser beam, and further improvement of the adjustment accuracy is desired. It is becoming.

The tilt adjustment method of the shaft disclosed in Japanese Patent Laid-Open No. 2000-094164 is a tilt adjustment method of the pushed shaft, and the shaft is also heated and melted.

In the motor component disclosed in Japanese Patent Laid-Open No. 2007-317272, an example is disclosed in which the relative position is adjusted by heating and deforming over the entire outer circumference of the substantially flat plate-shaped displacement portion.

An object of the present invention is to provide a method for adjusting the normal orientation of a substrate using a laser. Specifically, there is provided a method for adjusting the normal orientation of the substrate, which can precisely adjust the perpendicularity between the spindle motor base substrate and the rotational axis of the motor and the perpendicularity between the optical disk drive motor and the rotational axis thereof.

According to the present invention, the method for adjusting the normal orientation of the substrate is

According to the direction and the amount of changing the normal orientation of a specific region on the substrate, the normal orientation of the specific region is adjusted by irradiating a locally converged pulse laser to the predetermined region around the specific region by melting and cooling. In the method of adjusting the normal orientation of the substrate to be changed,

In the predetermined area | region which irradiates the said pulsed laser, the place which irradiates the said pulsed laser shall be multiple,

According to the direction of changing the normal orientation, the center position and range of the predetermined area is determined,

The amount of changing the normal orientation is increased or decreased by increasing or decreasing the number of points irradiated with the pulse laser in the predetermined area,

The distribution density of the place irradiated with the said pulsed laser is made high when the said irradiated place is extended, and made low when it reduces the said irradiated place,

The oscillation condition of the pulse laser is characterized in that it is substantially constant irrespective of the direction and the amount of changing the normal orientation.

 According to the adjustment method of the normal orientation of the board | substrate using the pulse laser of this invention, the normal orientation of the specific area | region of a board | substrate can be adjusted. When this adjustment method is applied to the adjustment of the shaft inclination of the spindle motor or the optical disk motor, the perpendicularity between the base substrate and the rotating shaft can be adjusted with high accuracy.

1 is a schematic sectional view showing a first embodiment of a disk drive device;
2 is a top view of the traverse unit,
3 is a schematic sectional view showing the first embodiment of the spindle motor;
4 is a schematic diagram showing a first embodiment of a skew adjusting device;
5 is a bottom view of the traverse unit,
6 is an enlarged view of the periphery of the mounting plate in FIG. 3;
7 is a schematic sectional view showing an irradiation section formed on a mounting plate after heating to a region to be heated by the heating section;
8 is a plan view illustrating the assembly in the traverse unit, and a bottom view of the chassis;
9 is an enlarged view of the periphery of the mounting plate in FIG. 3;
10 is a graph showing the relationship between the angle of the pulse laser and the amount of displacement of the irradiation part when the pulse laser is irradiated to each of the ranges A to D in the region to be heated of the mounting plate;
11 is a graph showing the relationship between the number of shots of a pulsed laser and the displacement of the irradiator;
12 is a schematic diagram showing a measuring device for measuring an amount of axial tilt with respect to an imaginary plane formed by the rotational axis of the spindle motor and the contact surface between the chassis and the holding jig;
13 is a flowchart illustrating a manufacturing process of the traverse unit;
14 is a plan view showing a state in which a pulse laser is irradiated onto the mounting plate, and a schematic bottom view of the mounting plate;
15 is a schematic sectional view showing another embodiment of the spindle motor;
16 is a schematic top view of the spindle motor of FIG. 15;
It is a schematic bottom view of the spindle motor of FIG.

ADJUSTMENT METHOD OF THIS INVENTION

The method for adjusting the normal orientation of the substrate using the pulse laser according to the present invention will be described in detail below with reference to the drawings.

First, the basic technology will be described.

For example, a pulse laser is irradiated to the surface of a metal substrate, and locally heated, melted, and cooled. In this case, the portion to which the pulse laser is irradiated is expanded in volume when heated and melted, and the surface to which the pulse laser is irradiated is convex and deformed. At this time, the hot-melted part tries to expand by surface tension, and there exists a part which moves in a board | substrate member. When such a hot melted portion is cooled, tensile stress is generated, and finally the surface to which the pulse laser is irradiated is deformed to be concave. Thereby, in order to adjust the normal orientation of a board | substrate, it turns out that it is good to irradiate a pulse laser to the area | region on the opposite side to 180 degree | times in the direction in which the normal orientation was inclined.

The irradiated part of a pulse laser turns into a melting spot. When these spots overlap greatly, the amount of deformation becomes small. For this reason, the adjustment amount of the normal orientation with respect to the irradiation pulse of a pulse laser will not be quantitative. Therefore, what is necessary is not to overlap the location irradiated with a pulse laser. In addition, when there are many adjustment amounts of normal orientation, the space | interval of the site | part irradiated by a pulse laser may become narrow and the peripheral part may overlap. If the overlap is only at the periphery, the influence on the quantitative value of the irradiation pulse and the normal orientation adjustment is small.

Since the full periphery of a specific area | region is considered for the area | region which irradiates a pulse laser, an annular area | region is assumed. The width in the radial direction in this assumed annular region is limited to a certain range in consideration of a specific substrate.

In consideration of this, in the apparatus for adjusting the normal orientation of the substrate, it is possible to cope with a mechanism that can rotate the substrate about the center of the specific region. That is, the pulse laser may be irradiated in synchronization with the rotation of the substrate.

[Example]

As an example to which the present invention can be applied, adjustment of the perpendicularity between the substrate and the rotation axis of the disk drive device is mentioned.

Therefore, first, the first embodiment of the disc drive device will be described with reference to FIGS. 1 and 2. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic cross section which cut | disconnected 1st Embodiment of the disk drive apparatus to the axial direction.

 <Disk drive unit>

Referring to FIG. 1, the disc drive device 1 includes a spindle motor 3, an optical pickup unit 41, a pair of guide rails 42, a moving mechanism 43, a chassis 44, It consists of the tray 5 and the housing 6.

Referring to FIG. 2, the spindle motor 3 rotates a disk-shaped disk (not shown) about a predetermined center axis J1 (hereinafter referred to as rotation axis J1). The optical pickup unit 41 is disposed on the pair of guide rails 42 and is movable by the moving mechanism 43 along the guide rails 42. The pair of guide rails 42 extend in the radial direction which is a direction perpendicular to the rotation axis J1.

The chassis 44 fixes the spindle motor 3, the guide rail 42, and the movement mechanism 43, and accommodates the optical pickup unit 41. Hereinafter, the component group fixed to the chassis 44 is called the traverse unit 4.

The tray 5 inserts and ejects the disk 2 and guides the disk 2 to the spindle motor 3. The housing 6 houses the above mentioned element.

The optical pickup unit 41 includes a light emitting portion for emitting light on the recording surface of the disk 2 and a light receiving portion for receiving light reflected from the recording surface of the disk 2.

When the disk 2 mounted on the tray 5 is moved coaxially with the rotational shaft J1 of the spindle motor 3, the disk 44 is moved to the spindle motor 3 by moving the chassis 44 upward.

When discharging the disk 2, the chassis 44 moves downward so that the disk 2 is displaced from the spindle motor 3 and transferred to the tray 5. The tray 5 moves to the outside of the housing 6 to take out the disk 2.

<Configuration of Traverse Unit>

The structure of the traverse unit 4 is demonstrated using FIG. 2 and FIG. 2 is a top view of the traverse unit 4. 5 is a bottom view of the traverse unit 4.

Referring to FIG. 2, the traverse unit 4 is fixed to a part of the chassis 44 in which the spindle motor 3 is substantially flat. The chassis 44 is provided with a receiving opening hole 441 for accommodating the optical pickup unit 41. The optical pickup unit 41 is capable of moving in the accommodation opening hole 441 along the radial direction (the arrow 4111 direction in FIG. 2) centering on the rotational axis J1. Several motor mounting parts 442 are formed in a part of the periphery of the receiving opening hole 441, and the mounting plate 326 (refer FIG. 3) of the spindle motor 3 mentioned later is being fixed. In this case, three motor mounting portions 442 are formed. The mounting holes 4421 are formed in the motor mounting portions 442, respectively.

The spindle motor 3 is fixed to the motor mounting part 442 by tightening the screw 4422 respectively through each mounting hole 4421. The outer periphery of the chassis 44 is provided with a housing 6 (see FIG. 1) and a housing mounting portion 445 mounted via a dumper. In this case, three housing mounting parts 445 are formed. The mounting plate 326 has a flat portion mounted to the motor mounting portion 442.

Referring to FIG. 5, the traverse unit 4 is a lower surface of the chassis 44, and is provided on both sides of the spindle motor 3 with a motor mounting portion 442 interposed therebetween to fix the guide rail 42. 1 Guide rail mounting parts 443 and 443 are formed, respectively. The second guide rail mounting portions 444 and 444 are formed at positions where the first guide rail mounting portions 443 and 443 extend through the accommodation opening hole 441, respectively. By these 1st guide rail mounting part 443 and the 2nd guide rail mounting part 444, a pair of guide rail 42 is arrange | positioned in parallel with each other and along radial direction (refer FIG. 2).

2, through-holes 411 and 412 are formed in the optical pickup unit 41 in the position corresponding to the guide rails 42 and 42, respectively, along the radial direction. Guide rails 42 and 42 are inserted into respective through holes 411 and 412. As a result, the optical pickup unit 41 can move along the pair of guide rails 42.

One of the pair of guide rails 42 is a feed shaft 421 having a male screw corresponding to a female screw formed on the inner circumferential surface of the through hole 411 on the outer circumferential surface thereof. The other of the pair of guide rails 42 is a sliding shaft 422 sliding with the through hole 412.

Referring to FIG. 2, the moving mechanism 43 includes a drive motor 431 having a gear on the output shaft and serving as a rotation drive source, and a reduction gear 432 meshing with a gear of the drive motor 431. The rotation of the drive motor 431 is decelerated by the reduction gear 432 and transmitted to the feed shaft 421.

When the drive motor 431 rotates, the gear of the output shaft rotates to rotate the deceleration gear 432. When the reduction gear 432 rotates, the feed shaft 421 rotates. As the feed shaft 421 rotates, the through hole 411 which meshes with the feed shaft 421 moves in the radial direction of arrow 4111 in the figure. At this time, the moving direction is reversed by the rotational direction of the drive motor 431. In this way, the optical pickup unit 41 moves along the direction of arrow 4111.

<Overall Structure of Spindle Motor>

The first embodiment of the entire structure of the spindle motor to which the present invention can be applied will be described with reference to FIG. 3. 3 is a schematic sectional view of the spindle motor 3.

Referring to FIG. 3, the spindle motor 3 includes a rotating body 31 that rotates about the rotating shaft J1, a fixed body 32 that rotatably supports the rotating body 31, and a rotating body 31. And a chucking device 33 which can rotate integrally with and hold a disk (not shown).

The rotating body 31 includes a shaft 311 disposed coaxially with the rotating shaft J1, a rotor holder 312 fixed to the shaft 311, a rotor magnet 313 fixed to the rotor holder 312, The holding member 314 fixed to the lower surface of the rotor holder 312 is provided. The rotor holder 312 is formed by pressing a thin steel sheet.

The fixed body 32 includes a sleeve 321, a housing 322, a stator 323, a lid member 324, a thrust plate 325, and a mounting plate 326.

The sleeve 321 is formed of an oil-sintered sintered body which is attached to a bearing for rotatably supporting the radial direction of the shaft 311, and has a substantially cylindrical shape. The housing 322 has an inner circumferential surface holding the outer circumferential surface of the sleeve 321. The stator 323 is fixed to the housing 322 and forms a rotating magnetic field with the rotor magnet 313.

The lid member 324 seals the lower end side of the inner circumferential surface of the housing 322. The thrust plate 325 is disposed on the upper surface of the lid member 324, and supports the shaft 311 rotatably in the axial direction. The mounting plate 326 is fixed to the lower end side of the inner circumferential surface of the housing 322 at the radially outer side of the lid member 324, and is fixed to the chassis 44 to have a substantially flat plate shape.

In the mounting plate 326, a through hole into which the lid member 324 and a part of the housing 322 are inserted is formed in the flat portion to be mounted to the motor mounting portion 442 (see FIG. 2).

The flange portion 3221 is formed on the upper portion of the housing 322. Under the flange portion 3221, a holding member 314 having an inner diameter smaller than the outer diameter of the flange portion 3221 is disposed. Thereby, the movement to the axial direction upper side of the rotating body 31 with respect to the fixed body 32 is regulated.

An inner protrusion 322a and an outer protrusion 322b are provided on the bottom surface of the housing 322. The inner protrusion 322a fixes the lid member 324. The outer protrusion 322b is formed radially outward than the inner protrusion 322a to fix the mounting plate 326.

The inner protrusions 322a and the outer protrusions 322b each have a substantially annular shape extending downward. Inwardly contacting the upper surface of the lid member 324, the inner contact surface 322c capable of determining the axial position of the lid member 324 is formed in the radially inner side of the inner protrusion 322a. On the outer side in the radial direction than the outer side protrusion part 322b, the outer side contact surface 322d which can determine the position of the axial direction of the mounting plate 326 is formed.

The inner contact surface 322c and the outer contact surface 322d are substantially annular planes extending perpendicularly to the rotational axis J1, respectively. In the state where the mounting plate 326 is in contact with the outer contact surface 322d, the outer protrusion 322a is plastically deformed outward in the radial direction. Thereby, the mounting plate 326 is fixed to the lower end surface of the housing 322 as it fits in between the outer contact surface 322d and the outer protrusion part 322a. That is, the mounting plate 326 is caulking fixed to the housing 322

Similarly, the lid member 324 is plastically deformed to the inner side in the radial direction. As a result, the lid member 324 is fixed to the lower end surface of the housing 322 as it is sandwiched between the inner contact surface 322c and the inner contact surface 322a. That is, the lid member 324 is fixed to the housing 322 caulking. Therefore, fixing of the mounting plate 326, the lid member 324, and the housing 322 is fixed by inexpensive method, without using a member for fixing. As a result, an inexpensive motor can be provided.

The chucking device 33 includes a center case 331, a claw 331a, a claw member 332, and an elastic member 333.

The center case 331 faces the inner circumferential surface of the center opening 21 (refer to FIG. 1) formed in the disk 2 in the radial direction, and is disposed inward of the center opening 21. The guard hook 331a is provided integrally with the center case 331. The claw 331a adjusts the center of the center opening 21 of the disk 2 and the center of the center case 331 by pressing the inner peripheral surface of the center opening 21 radially outward. The hook member 332 is movable in the radial direction holding the disk 2 by pressing the upper edge of the center opening 21. The elastic member 333 presses the hook member 332 radially outward.

In this embodiment, the claws 331a are integrally provided with the center case 311, and are provided three apart from the circumferential direction. The hook members 332 are arranged between the guard hooks 331a which are adjacent to each other in the circumferential direction, and three are provided. The elastic member 333 uses a coil spring that expands and contracts in the radial direction.

On the upper surface of the outer side in the radial direction in the rotor holder 312, a mounting surface 312a on which the lower surface of the disk 2 is mounted is formed. In the present embodiment, the mounting surface 312a is formed by arranging a resin material such as a rubber having a larger friction coefficient than the upper surface of the rotor holder 312 in a ring shape. By providing the mounting surface 312a on the upper surface of the rotor holder 312, it is not necessary to form a turntable for mounting the disk 2 as a separate member. As a result, the number of parts can be reduced and the axial direction of the spindle motor can be reduced. Since the rotor holder 312 can be formed by press working, it can be manufactured at low cost.

Hereinafter, the adjustment method of the normal orientation of the board | substrate which concerns on this invention is demonstrated using skew adjustment which is a specific example at the time of applying to the adjustment of the axial tilt of a spindle motor.

<Skew adjusting device and measuring device>

In the spindle motor and the disk drive device, the skew adjusting device and the skew adjusting method will be described with reference to FIGS. 4 to 12.

FIG. 4: is a schematic diagram which shows 1st Embodiment of the skew adjustment apparatus 7 in this invention.

With reference to FIG. 4, the skew adjustment apparatus 7 is demonstrated. The skew adjusting device 7 includes a holding unit 71, a measuring unit 72, a heating unit 73, a rotating mechanism 74, a moving mechanism 75, and a control unit 76.

The holding part 71 holds the assembly AS1. Here, the assembly AS1 refers to a state in which the spindle motor 3 and the chassis 44 are assembled in the traverse unit 4. The measurement part 72 measures the height of the center axis J2 direction in the some measurement position on the chassis 44. As shown in FIG. The heating portion 73 heats the mounting plate 326 held by the holding portion 71. The rotating mechanism 74 rotates the assembly AS1 together with the retaining portion 71. The moving mechanism 75 moves the holding part 71 relative to the heating part 73. The control unit 76 controls this configuration.

Here, the center axis J2 is the rotation center of the rotation mechanism 74. The chassis 44 has a holding portion 71 so that the contact position J1a of the central axis J2, the shaft 311 of the spindle motor 3, and the thrust plate 325 (see FIG. 3) are approximately the same. ) Is arranged. In the present embodiment, three holding portions 71 are provided.

5 is a plan view of the traverse unit 4 seen from below.

In the skew adjusting device 7, the assembly AS1 holds the side on which the spindle motor 3 is mounted in the motor mounting portion 442 of the chassis 44 toward the upper side in the axial direction. Is seen by. Thereby, the position of the axial direction with respect to the holding | maintenance part 71 of the chassis 44 is determined. The measuring unit 72 is disposed above the holding unit 71. The upper side of the retaining portion 71 is the side on which the spindle motor 3 is mounted relative to the chassis 44.

The measurement unit 72 measures the height in the axial direction from the reference position (reference plane). The reference position (reference plane) is an imaginary plane 446 (FIG. 5) which binds each contact surface (Zl, Z2, Z3 in FIG. 5) with the holding portion 71 and a plane of the same height in the lower surface of the chassis 44. 5).

The heating part 73 is arrange | positioned under the holding part 71 (refer FIG. 4). The lower side of the retaining portion 71 is the lower surface side of the chassis 44 which is the side opposite to the side on which the spindle motor 3 is mounted. And the heating part 73 heats the mounting plate 326 by irradiating a pulsed pulse laser locally from the lower surface side of the mounting plate 326. The movement mechanism 75 is what is called an XY table which moves the chassis 44 with the holding part 71 in two directions parallel to the virtual plane 446 and perpendicular to each other.

In the skew adjusting apparatus 7, the assembly AS1 held by the holding part 71 is rotated at a constant speed by the rotation mechanism 74 about the central axis J2. With the rotation of the assembly AS1 by the rotation mechanism 74, the heating portion (3) is provided on the minute irradiation area in the mounting plate 326 of the spindle motor 3 on the lower surface side of the mounting plate 326. The pulsed laser beam from 73 is irradiated. As a result, on the lower surface side (see FIG. 1) of the mounting plate 326 of the spindle motor 3, in the annular region 3331 formed radially outward from the outer protrusion 322b of the housing 322. The pulsed laser is irradiated at a predetermined irradiation angle range (see FIG. 6). By the pulse laser irradiation, this area 3331 is heated. In the following description, the region 3221 is referred to as the "heated region 3331".

FIG. 6 is an enlarged view enlarging the circumference of the mounting plate 326 in the spindle motor 3 of FIG. 3. FIG. 7: is a schematic cross section which shows the irradiation part 3262 formed in the mounting plate 326 after heating to the to-be-heated area | region 3331 by the heating part 73. As shown in FIG.

With reference to FIGS. 6 and 7, the heated region 3331 is heated from the lower surface side of the mounting plate 326 so that the heated region 3331 is melted, and once to the lower surface side (downward in FIG. 7). And expand with plastic deformation. Thereafter, as the temperature decreases, the region to be heated 3331 shrinks and deforms upward in FIG. 7. This deforms in the direction opposite to the deformation direction at the time of heating.

As a result, the substantially flat portion 3326 surrounded by the region to be heated 3326 is opposite to the heating portion 73 side with respect to the central axis J2 as shown in the dashed-dotted line in FIG. 7. Displace.

In the following description, the part 3262 of the mounting plate 326 is called "irradiation part 3262".

FIG. 8 is a view showing the assembly in the traverse unit 4 of the present invention, and is a plan view seen from the lower side of the chassis 44.

With reference to FIG. 8, it is provided in the position different from the center P1 of the 2nd virtual plane 446a which tied three motor mounting parts 442, and the rotating shaft J1 of the spindle motor 3. As shown in FIG. In addition, the lower surface of the mounting plate 326 forming the region to be heated 3331 is asymmetric in the circumferential direction about the central axis J1. Therefore, the region to be heated 3331 (see FIGS. 6 and 7) has different strengths in the circumferential direction. Therefore, even if the pulse laser is irradiated with a constant output in the circumferential direction, the amount of deformation of the irradiating portion 3262 in the region to be heated 3326 varies depending on the position in the irradiated circumferential direction.

FIG. 9 is an enlarged view in which the periphery of the mounting plate in the spindle motor 3 is enlarged in FIG. 3.

Therefore, as shown in FIG. 9, the to-be-heated area | region 361 (refer FIG. 6 and FIG. 7) in the spindle motor 3 is divided into 4 parts in the circumferential direction centering on the rotating shaft J1, and each The phases are called A phase, B phase, C phase, and D phase (corresponding to A to D in FIG. 9). Each of these A phases to D phases is irradiated with a pulse laser in which the irradiation angle range is changed. Thereby, the data of the relationship of the range of the irradiation angle of the pulse laser in each range of A phase to D phase and the displacement amount of the irradiation part 3326 are created.

10 is a graph showing the relationship between the angle of the irradiation range and the displacement amount (angle) of the irradiating portion 3326. The angle of the irradiation range is centered on the center axis J2 of the pulse laser when the pulse laser is irradiated to each range of A phase to D phase in the region to be heated 3326 of the mounting plate 326. Refers to the angle of an arc shape. Here, the A phase to the D phase are positions set at equal intervals of 90 degrees in the circumferential direction with respect to the center axis J2 (or the rotation axis J1), and on both sides of the circumferential direction around this position Half of the irradiation angle range of the pulse laser is irradiated. In this embodiment, a pulse laser is irradiated approximately 90 degrees in the circumferential direction centering on each range of A phase to D phase.

As can be seen from Fig. 10, in the irradiation angle of the pulse laser to each range of A phase to D phase, the amount of displacement of each irradiation section 3262 differs when the irradiation angle ranges from 60 degrees to 120 degrees or 240 degrees or more. Is growing. On the other hand, when the range of irradiation angle is about 180 degree, the difference in the displacement amount of the irradiation part 3262 is the smallest. Therefore, the amount of displacement of the irradiation part 3262 can be made substantially constant by irradiating a pulse laser to the range of about 180 degree in each range of A phase-D phase. That is, it is good to make the predetermined area | region which irradiates a pulse laser about halfway around the center of a specific area | region.

If a pulse laser is irradiated to the center of a circular substrate, it is guessed that the difference of displacement amount will be small for any phase other than the above result. Since the substrate used in this experiment has the shape shown in Fig. 9, the shape of the periphery of the region irradiated with the pulse laser differs depending on the phase, i.e., since the circumferential edge of the substrate differs in rigidity in the circumferential direction, It is assumed that a difference has occurred.

11 is a graph showing the relationship between the number of shots of the pulse laser and the amount of displacement (adjustment amount (angle)) of the irradiating portion 3326. As shown in FIG. 11, it is understood that the amount of displacement of the irradiator 3326 is changing in proportion to the number of shots of the pulse laser in general. From this, by controlling the number of shots of the pulse laser, it is possible to quantitatively control the amount of displacement of the irradiator 3326. Here, the short number of pulse lasers is the number of times to irradiate a pulse laser within the irradiation angle range of a pulse laser. For example, when the number of shots of the pulse laser is 30, when the irradiation angle range of the pulse laser is approximately 180 degrees, the pulse laser is irradiated approximately every 6 degrees.

<Measurement method of shaft tilt amount on a rotating shaft of a spindle motor>

Next, the measuring method of the shaft tilt amount of the rotating shaft J1 of the spindle motor 3 with respect to the virtual plane 446 (refer FIG. 5) is demonstrated using FIG. This virtual plane 446 is a virtual plane formed at the contact surface between the holding portion 71 and the chassis 44 of the assembly AS1.

FIG. 12: is a schematic diagram which shows the measuring apparatus 8 which measures the axial tilt amount of the rotating shaft J1 of the spindle motor 3 with respect to the virtual plane 446. As shown in FIG.

The measuring apparatus 8 is attached to the holding jig 82 and the spindle motor 3 which are in contact with the position where the auto collimator 81 and the holding part 71 in the chassis 44 contacted, and the auto collimator A dummy disk 83 reflecting light from 81 is provided. The holding jig 82 forms the virtual plane 446 by contacting the same portion of the chassis 44. The chassis 44 is in contact with the retaining portion 71 of the skew adjusting device 7.

The auto collimator 81 includes a lens unit 811 that emits and receives light, and a display 812 that shows data of emission and reception of the lens 811. First, the dummy disk 83 is rotated by the spindle motor 3. Light emitted from the lens unit 811 of the auto collimator 81 to the dummy disk 83 in a direction perpendicular to the virtual plane 446 is reflected by the dummy disk 83 and is then received by the lens unit 811 again. do. At this time, from the data of the deviation between the light emitting position and the light receiving position of the lens unit 811, the axial tilt amount and direction of the rotating shaft of the spindle motor are calculated and displayed on the display 812.

<Method of manufacturing traverse unit 4>

The manufacturing method of the traverse unit 4 in this invention is demonstrated using FIG. 13 is a flow chart showing the flow of manufacture of the present invention. In this embodiment, the flow of manufacture of the traverse unit 4 is demonstrated especially.

First, the spindle motor 3 is attached to the motor mounting part 442 of the chassis 44 formed by press working (step S1). In this embodiment, the spindle motor 3 is fixed to the motor mounting part 442 by fastening with a screw.

Subsequently, in the assembly AS1 state in which the spindle motor 3 is assembled to the chassis 44, the shaft tilt amount with respect to the virtual plane 446 of the rotational axis J1 of the spindle motor 3 in the measuring device 8. And the position of the circumferential direction is measured (step S2).

First, the chassis 44 is brought into contact with the holding jig 82 of the measuring device 8 and held. At this time, the virtual plane 446 is formed by binding the contact surface between the holding jig 82 and the chassis 44. This virtual plane 446 is referred to as the reference plane.

Next, the dummy disk 83 is attached to the spindle motor 3. And the lens part 811 of the auto collimator 81 is arrange | positioned on the upper side of the dummy disk 83 so that light may contact the upper surface of the dummy disk 83. This lens portion 811 is set to be perpendicular to the virtual plane 446.

And when the shaft tilt amount with respect to the virtual plane 446 of the rotating shaft J1 of the spindle motor 3 exists in preset setting allowance range (Yes), it progresses to the mounting process of the guide rail 42 which is step S4 in FIG. do.

On the other hand, when the shaft tilt amount with respect to the virtual plane 446 of the rotation shaft J1 of the spindle motor 3 is out of the range of a preset allowable amount (No), the shaft tilt amount of the rotation shaft J1 of the spindle motor 3 is Skew adjustment is performed to adjust (step S3 in FIG. 13).

In order to perform skew adjustment, the irradiation conditions of a pulse laser may be determined in the following procedures.

(1) A plurality of assemblies in which the spindle motor and the chassis are assembled are prepared, and the irradiation angle range and the number of shots are changed thereon to irradiate the pulsed laser.

(2) A quantitative relationship between the irradiation angle and the number of shots and the amount of displacement of the irradiation unit 3326 is obtained.

(3) From the above result, the optimum irradiation angle range and the number of shots are determined.

In this embodiment, the irradiation angle range of the optimal pulse laser is approximately 180 degrees as shown in FIG. In addition, the quantitative relationship between the number of shots of a pulse laser and the displacement amount of the irradiation part 3262 is shown in FIG.

The optimal number of shots of the pulsed laser is selected by comparing the shaft tilt amount of the rotating shaft J1 of the spindle motor 3 measured in step S2 in FIG. 13 with FIG. 11. And a pulse laser is irradiated over the range of about 180 degree centering on the position in the circumferential direction of the axial tilt of the rotating shaft J1 of the spindle motor 3. In other words, this is to irradiate a pulse laser with a range of approximately 90 degrees from the position in the circumferential direction of the shaft tilt of the rotation shaft J1 of the spindle motor 3 toward both sides in the circumferential direction (see FIG. 14). Thereby, the shaft tilt amount of the rotating shaft J1 of the spindle motor 3 is adjusted.

Here, with reference to FIG. 14, the to-be-heated area | region 3331 is irradiated in circular arc shape of about 180 degree to the axial tilt direction side of the rotating shaft J1. As a result, the mounting plate 326 on the shaft tilt direction side of the rotation shaft J1 is displaced upward in the axial direction. Along with this, the housing 322 is also displaced upward in the axial direction. And the inner peripheral surface of the through-hole holding the sleeve 321 of the housing 322 is displaced to the opposite side with respect to the central axis J1 with respect to the axial tilt direction. With the displacement of this housing 322, the sleeve 321 is also displaced to the opposite side with respect to the central axis J2 with respect to the axial tilt direction.

Therefore, the shaft 311 supported by the inner peripheral surface of the sleeve 321 similarly displaces to the opposite side with respect to the central axis J2 with respect to the axial tilt direction. As a result, since the shaft 311 and the rotating shaft J1 are the same axes, the rotating shaft J1 is adjusted within a preset allowable range. See FIG. 3 for housing 322, sleeve 321 and shaft 311.

And again, the shaft tilt amount and position with respect to the virtual plane 446 of the rotating shaft J1 of the spindle motor 3 are measured by the measuring apparatus 8 of step S2 in FIG. Thereby, the range of the shaft tilt amount with respect to the virtual plane 446 of the rotating shaft J1 of the spindle motor 3 again is compared with the range of preset allowable amount. And when the shaft tilt amount with respect to the virtual plane 446 of the rotating shaft J1 of the spindle motor 3 is out of the range of a setting allowance, the skew adjustment of step S3 in FIG. 13 is performed again.

After the end of the skew adjustment in step S3 in FIG. 13, the dummy disk 83 is separated from the spindle motor 3. A pair of guide rails 42 in which the optical pickup unit 41 is mounted in advance are mounted on the first guide rail mounting portion 443 and the second guide rail 444 of the chassis 44 (step in FIG. 13). S4). Here, the movement mechanism 43 is mounted to the chassis 44 at the same time. As a result, the traverse unit 4 is assembled.

In the skew adjustment by this invention, since the irradiation area of a pulse laser was specified to the specific angular range, the gap of the displacement amount by irradiation of a pulse laser can be made small. Therefore, the amount of tilt and the direction of the axis of rotation J1 with respect to the virtual plane 446 that is the reference plane can be managed with high accuracy.

Thereby, the rotation axis J1 of the spindle motor 3 in the traverse unit 4 and the light emission direction of the optical pickup unit 41 can be adjusted substantially in parallel. That is, the rotational axis J1 of the spindle motor 3 and the light emission direction of the optical pickup unit 41 can be made within the range of the predetermined relative inclination amount. Therefore, the light emission direction of the optical pickup unit 41 and the recording surface of the disk 2 can be made vertical with high accuracy. As a result, it is possible to provide a disc drive device capable of sufficiently preventing a recording and reproducing error caused by the inclination of the rotating shaft. In addition, it is possible to provide a disk drive device capable of reducing vibrations caused by rotation of the spindle motor.

The adjustment method of the shaft tilt of the rotating shaft J1 using the skew adjustment apparatus 7 by this invention can adjust the shaft tilt amount with respect to the virtual plane 446 with high precision. For this reason, it is especially suitable as an adjustment method in the case of using the pressed rotor holder 312 for the spindle motor 3. In addition, the press working has a limit in improving the processing accuracy.

Moreover, it is especially suitable as the adjustment method in the case of using the fixed body 32 by which the mounting plate 326 and the housing 322 were caulked for the spindle motor 3. The caulking structure of the mounting plate 326 and the housing 322 has a particularly strong influence on the shaft tilt of the rotating shaft J1.

These spindle motors 3 are mounted in the disc drive device 1.

<Skew adjustment in the state that the spindle motor is assembled>

Skew adjustment in the state which assembled the spindle motor is demonstrated using FIGS. 15-17. It is a schematic cross section which cut | disconnected axially and shows another embodiment of the spindle motor of this invention. 16 is a plan view of the spindle motor of FIG. 15 seen from above in the axial direction. FIG. 17 is a plan view of the spindle motor of FIG. 15 seen from below in the axial direction. FIG. The spindle motor 3a in FIGS. 15-17 uses the same member as the spindle motor 3 except the mounting plate 326a.

Hereinafter, the description about the same member as the spindle motor 3 is abbreviate | omitted, and the shape of the mounting plate 326a is demonstrated.

The mounting plate 326a of the spindle motor 3a includes a first flat portion 326a1, a bent portion 326a2, and a second flat portion 326a3. The housing 322 is fixed to the first flat portion 326a1 and has a substantially circular shape. The bent portion 326a2 is bent upward from the first plane portion 326a1. The second planar portion 326a3 is continuous with the bent portion 326a2 and forms a plane parallel to the first planar portion 326a1, so that a plurality of mounting portions 326a4 mounted on the chassis (not shown) are formed. It is.

In this embodiment, three mounting parts 326a4 are provided. The bent portion 326a2 is formed in a part of the circumferential direction of the outer circumference of the first planar portion 326a1.

In addition, the plane used as the reference | standard of the spindle motor 3a is the imaginary plane 446b formed by grouping the some mounting part 326a4 (refer FIG. 17). And the axial tilt amount and direction of the rotating shaft J1 of the spindle motor 3a with respect to the virtual plane 446b are measured. As a result, since the plurality of mounting portions 326a4 are directly mounted to the chassis, it becomes an important site for determining the position and the inclination of the spindle motor 3a with respect to the chassis. Therefore, highly accurate skew adjustment can be performed by making the virtual plane 446b formed in the some mounting part 326a4 into a reference plane.

Moreover, since the bent part 326a2 is formed in the mounting plate 326a in the circumferential direction of the outer periphery of the 1st planar part 326a1, the 1st planar part 326a1 is centered on the rotating shaft J1. The intensity in the circumferential direction is uneven.

Here, the to-be-heated area | region 3331 and the irradiation part 3262 irradiated with a pulse laser are the same positions as the spindle motor 3 here.

As described above, the skew adjustment of the spindle motor 3a is a step of setting the irradiation angle range of the pulse laser which is the heating unit in advance, and the irradiation unit when the number of shots of the pulse laser is changed with respect to the irradiation angle range of the set pulse laser. The process of obtaining the data of the relationship with the change of the displacement amount of is performed. Then, the tilt amount and direction of the axis of rotation J1 with respect to the imaginary plane 446b of the spindle motor 3a are measured, and then a pulse laser around the direction of the axis tilt is irradiated. Thereby, the spindle motor 3a can be made perpendicular to the virtual plane 446b with high precision.

In the process of setting the irradiation angle range of the pulse laser, first, the strength of the first planar portion 326a1 of the mounting plate 326a is divided into a plurality of ranges (divided into four ranges in this embodiment). Then, the pulse laser beams in which the irradiation angle ranges are plurally changed are irradiated to each divided range, and data obtained by measuring the displacement amount is collected. Based on the collected data, the irradiation angle range of the pulse laser with the smallest gap in the displacement amount of the irradiation section of each range is set. In this embodiment, the irradiation angle range of the pulse laser is approximately 180 degrees.

Next, when the number of shots of the pulse laser is changed, in the step of obtaining the relationship between the number of shots and the displacement amount of the irradiation section, the number of shots is varied in the irradiation angle range of the set pulse laser to irradiate the pulsed laser. This makes it possible to obtain quantitative data on the relationship between the change in the number of shots of the pulse laser and the displacement amount of the irradiation section.

Based on this data, after measuring the shaft tilt amount and direction with respect to the virtual plane 446b of the spindle motor 3a, the number of shots of the pulse laser which is optimal for correcting the shaft tilt amount is set, and a pulse laser is performed. Investigate. As a result, high-precision skew adjustment of the spindle motor 3a can be realized.

As mentioned above, although various embodiment of this invention was described, this invention is not limited to the above-mentioned embodiment, Various modifications are possible within the scope of this invention.

For example, although skew adjustment in above-mentioned embodiment was performed in the assembly AS1 state, this invention is not limited to this. After assembling the traverse unit 4, you may adjust skew.

For example, in the skew adjustment method in the above-described embodiment, when setting the irradiation angle range of the pulse laser, the range of the mounting plates 326 and 326a is divided into four ranges around the rotational axis J1 and set. However, the present invention is not limited to this. As a range of a mounting plate, even if it is not four ranges, there may exist several ranges.

For example, the mounting plates 326 and 326a are not limited to the above-mentioned embodiment. For example, the chassis and the mounting plate may be made of the same member to form an installation base.

For example, in the disk drive apparatus 1 of the above-mentioned embodiment, although the disk 2 was conveyed by the tray 5, this invention is not limited to this. For example, you may convey a disk by providing a roller in both sides of the opening hole which inserts and discharges the disk of the housing of a disk drive apparatus.

The disk drive described above is a device for driving an optical disk. In the optical disk drive device, the mounting plate 326 is often a steel sheet. The disk drive device is not limited to this and may be a hard disk drive device. In this case, the substrate on which the motor is mounted is often made of aluminum die cast. The present invention is also applicable to a substrate made of an aluminum die cast.

In the above description, the present invention has been described using a disk drive as an example. However, the present invention is not limited to this, and the pulse laser oscillation condition is made constant regardless of the direction and the amount of changing the normal orientation of the substrate, so that the normal orientation of the substrate can be adjusted, which is a preferable method with good operability.

The present invention can change the normal orientation of the substrate without changing the oscillation conditions of the pulsed laser. Therefore, it is applicable not only to the adjustment of the normal orientation in the mounting plate of the disk drive apparatus mentioned above, the adjustment of the shaft tilt of a spindle motor, but also the adjustment of the normal orientation of various board | substrates.

1: disc drive unit 2: disc
3, 3a: spindle motor 31: rotating body
311: shaft 312: rotor holder
312a: Mounting surface 313: Rotor magnet
32: fixed body 321: sleeve (bearing part)
322 housing 326, 326a mounting plate
3261: area to be heated 3262: irradiation unit
33: chucking device 4: traverse unit
41: optical pickup unit 42: guide rail
44: chassis 441: receiving opening hole
442: motor mounting portion 446, 446a: virtual plane
5: tray 6: housing
J1: axis of rotation J2: center axis
S1 to S4: step (process)

Claims (10)

According to the direction and the amount of changing the normal orientation of a specific region on the substrate, the normal orientation of the specific region is adjusted by irradiating a locally converged pulse laser to the predetermined region around the specific region by melting and cooling. In the method of adjusting the normal orientation of the substrate to be changed,
In the predetermined area | region which irradiates the said pulsed laser, the place which irradiates the said pulsed laser shall be multiple,
According to the direction of changing the normal orientation, the center position and range of the predetermined area is determined,
The amount of changing the normal orientation is increased or decreased by increasing or decreasing the number of points irradiated with the pulse laser in the predetermined area,
The distribution density of the part irradiated with the said pulsed laser is made high when the said irradiated place is extended, and made low when it reduces the said irradiated place,
The oscillation condition of the pulsed laser is made substantially constant irrespective of the direction and amount of changing the normal orientation,
The said predetermined area | region is annular centering on the center of the said specific area | region,
The plurality of irradiation points are in the annular predetermined region,
Since the periphery of the substrate has an asymmetrical shape in the circumferential direction with respect to the center of the specific region, the stiffness is different in the circumferential direction with respect to the center of the specific region, so that the amount of deformation of the portion irradiating the pulse laser is circumferential. Depends on direction,
The predetermined area is spread over a half around the center of the specific area, characterized in that
Method of adjusting the normal orientation of the substrate. The method of claim 1,
Knowing in advance the relationship between the number of points irradiated with the pulsed laser to the predetermined area and the direction and amount in which the normal of the specific area changes.
Based on the relationship, the number of points irradiated with the pulsed laser is determined according to the amount of changing the normal orientation.
Method of adjusting the normal orientation of the substrate. The method of claim 1,
The distribution density of the said irradiation site is controlled by the distance between the center of a specific area | region and the irradiation position, and the distance between adjacent irradiation sites, It is characterized by the above-mentioned.
Method of adjusting the normal orientation of the substrate. delete delete The method according to any one of claims 1 to 3,
The substrate is made of a material which causes deformation by heating and cooling by local irradiation of the pulsed laser.
Method of adjusting the normal orientation of the substrate. The method according to claim 6,
The substrate is characterized in that the aluminum alloy or steel sheet
Method of adjusting the normal orientation of the substrate. The method of claim 7, wherein
The substrate is characterized in that the base substrate of the spindle motor
Method of adjusting the normal orientation of the substrate. The method of claim 8,
The base substrate has a plane in which the bearing portion of the spindle motor is fixed, the circumference of the plane is characterized in that the rigidity is different in the circumferential direction
Method of adjusting the normal orientation of the substrate. The method of claim 7, wherein
The substrate is characterized in that the motor base substrate for the optical disk drive
Method of adjusting the normal orientation of the substrate.

Images