JP3375238B2 - Disk unit - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a disk drive, and more particularly to rotating a disk as a recording medium and moving an optical head in a disk radial direction along a guide shaft. The present invention relates to a disk device configured as described above. 2. Description of the Related Art In a disk drive on which a disk as a disk-shaped recording medium is mounted, a laser beam is applied to a recording surface of the disk, and an information signal recorded on the disk is detected from the reflected light. It is configured. As this type of disk device, an optical disk device that reads information (audio signal or image signal) recorded on a disk, or writes and records information on a recording surface of the disk, or optically transfers information recorded on a disk There is a magneto-optical disk device for reading. FIG. 8 is a plan view of a conventional disk drive, and FIG.
Is a longitudinal sectional view of a conventional disk device. In the disk device, a disk drive motor 3 for rotating a turntable 2 on which a disk (not shown) is mounted is provided on a lower surface of a chassis 1 (indicated by a dashed line in FIG. 8) formed of an iron sheet metal; An optical head 4 that reads information recorded on a disk or writes information on the disk is attached. Also, on the lower surface of the chassis 1,
Guide shafts 5 and 6 made of stainless steel for guiding the movement of the optical head 4 are attached so as to extend in the disk radial direction. The chassis 1 has a semicircular mounting hole 1b into which the disk drive motor 3 is inserted and an optical head 4
An opening 1c provided corresponding to the moving range of the guide shaft 6 and an opening 1d provided corresponding to the extending direction of the guide shaft 6 are provided. The disk drive motor 3 includes a housing 3a
The mounting base 3b is fixed below the chassis 1 via the positioning member 7. The positioning member 7 regulates the height position of the turntable 2 so that the spindle 3c of the disk drive motor 3 stands upright with respect to the chassis 1 or the disk mounting surface of the turntable 2 is 1
This restricts the mounting direction of the disk drive motor 3 so as to be in a horizontal state parallel to. The guide shafts 5 and 6 are held by shaft holding members 8 and 9 having both ends fixed to the chassis 1. The shaft holding members 8 and 9
It has a shaft insertion hole (not shown) into which both ends of the guide shafts 5 and 6 are inserted. That is, the pair of guide shafts 5 and 6 are held parallel to each other while being inserted into the shaft insertion holes of the shaft holding members 8 and 9, and
The extending direction with respect to the mounting position of the disk drive motor 3 and the position in the height direction with respect to the chassis 1 are determined. The optical head 4 has a configuration in which an optical pickup 4b is held on a sliding base 4a, and an objective lens 4c of the optical pickup 4b faces the lower surface (recording surface) of the disk mounted on the turntable 2. It slides in the disk radius direction. The sliding base 4a moves a predetermined distance in the radial direction of the disk by transmitting the rotational driving force of a head drive motor (not shown) composed of a DC motor via a rack and pinion. A sliding base 4a of the optical head 4 is provided at one end with a bifurcated engaging portion 4d for engaging the outer periphery of the guide shaft 5, and a guide shaft 6 at the other end of the sliding base 4a. A fitted thrust bearing 4e is provided. Therefore, the optical head 4 is guided by the guide shafts 5 and 6 whose both ends are arranged in parallel, but the sliding position in the tracking direction is precisely guided by the guide shaft 6 into which the thrust bearing 4e is fitted. In the above-mentioned conventional disk device, when the sliding position of the optical head 4 is shifted, signals are recorded at a high density on the recording surface of the disk. Since the curvature of the recording track becomes smaller toward the circumferential side, accurate tracking cannot be performed when the position of the objective lens 4c of the optical pickup 4b is slightly deviated, so that servo cannot be performed and reading / writing cannot be performed. That is, in the above disk device, since the sliding position of the optical head 4 is determined by the guide shaft 6, the position of the guide shaft 6 in the extending direction with respect to the mounting position of the disk drive motor 3 and the position in the height direction with respect to the chassis 1 are accurately determined. Must. In addition, conventionally, the guide shaft 6 is fixed by fixing the shaft holding member 9 to the lower surface of the chassis 1.
Since the disk drive motor 3 is mounted on the lower surface of the chassis 1 via the positioning member 7, the number of parts is large. If the disk drive motor 3 is assembled as it is, errors for each part are accumulated and the guide shaft 6 and the disk drive The displacement of the relative position with respect to the motor 3 becomes large, and the displacement of the optical head 4 easily occurs. For this reason, conventionally, it is necessary to adjust the relative position between the disk drive motor 3 and the guide shaft 6 for accurate positioning when the disk drive motor 3 and the guide shaft 6 are attached. FIGS. 10 (A) and 10 (B) are diagrams for explaining an adjustment operation when the mounting position of the guide shaft 6 with respect to the mounting position of the disk drive motor 3 using the gauge 10 is determined. Conventionally, the mounting position of the disk drive motor 3 with respect to the mounting position of the guide shaft 6 has been adjusted using the gauge 10 in the assembly process of the disk device. The gauge 10 has a V-shaped notch 10a that contacts two points on the outer periphery 2a of the turntable 2 from the side,
And a V-shaped groove 10b contacting the guide shaft 6 from above. Before the shaft holding member 9 holding both ends of the guide shaft 6 is fixed to the chassis 1, the gauge 10
Is used to adjust the mounting position of the guide shaft 6. Therefore, in the assembly process, the gauge 10
The V-groove 10b is fitted to the guide shaft 6 in a state where the notch 10a is in contact with the outer periphery 2a of the turntable 2.
Thus, the mounting position of the disk drive motor 3 with respect to the mounting position of the guide shaft 6 is determined. The disk drive motor 3 is fixed to the chassis 1 in a state where the mounting position of the disk drive motor 3 has been determined in this manner. That is, the shaft holding member 9
The boss 9a is positioned by inserting the boss 9a into a small hole provided in the chassis 1, and is fixed to the chassis 1 by screwing the mounting screw 9b of the shaft holding member 9 into the chassis 1. Therefore, conventionally, the gauge 1 as described above is used.
0 and the disk drive motor 3 and the guide shaft 6
Therefore, the relative position of the assembly must be accurately adjusted, the adjustment work is troublesome, and the operation time in the assembling process cannot be reduced. Therefore, an object of the present invention is to provide a disk device that solves the above problem. According to the present invention, there is provided a disk motor provided with a reference portion having a predetermined positional relationship with respect to a rotating shaft, and for rotationally driving a turntable supporting a disk via the rotating shaft. And a guide shaft for guiding an optical head for writing and reading signals to and from the disk so as to be movable in a disk radial direction, engages with the reference portion of the disk motor in a disk device mounted on a chassis. The engaging portion and a shaft holding portion for holding the guide shaft are integrally formed ,
Not have a positioning member attached to the chassis.
The disc motor is configured such that the reference portion is
Engage with the positioning member,
The shaft has the end held by the shaft holding portion,
It is characterized in that it is attached to a positioning member . Therefore, according to the present invention , the disk motor and the guide shaft are connected to each other through the positioning member in which the engaging portion that engages with the reference portion of the disk motor and the shaft holding portion that holds the guide shaft are integrally formed. Can be attached to the chassis, the reference part of the disk motor is the engagement part
Attached to the positioning member
Remove the motor without moving the mounting position of the guide shaft.
Maintenance can be easily performed, and there is no need to perform a complicated positioning operation using a gauge as in the related art, and the operation time in the assembly process can be reduced. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a disk drive according to the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a disk drive according to the present invention, and FIG. 2 is a longitudinal sectional view of the disk drive. The same parts as those of the above-described conventional disk device are denoted by the same reference numerals, and description thereof will be omitted. Reference numeral 11 denotes a positioning member for mounting the disk drive motor 3 and the guide shaft 6 to the chassis 1, and holds a motor mounting portion 12 to which the mounting base 3b of the disk drive motor 3 is mounted and an end of the guide shaft 6. And a shaft holding portion 13. The motor mounting portion 12 is formed in a shape curved in an arc so as to avoid the outer periphery of the disk drive motor 3. The positioning member 11 is made of a synthetic resin, and the motor mounting portion 12 and the shaft holding portion 13 are integrally formed. In this embodiment, a PPS material suitable for high-precision machining and having sufficient strength is used for the material of the positioning member 11.
(Polyphenylene sulfide) 4 glass fibers in resin
A synthetic resin material containing 0% is used. FIG. 3 is an exploded perspective view showing a main part of the present invention. The positioning member 11 is a disk drive motor 3
When the mounting screws 14 are inserted into the motor mounting portion 12 from below and screwed to the chassis 1 when mounting the chassis 1 to the chassis 1, the mounting screws 14 are fixed to the lower surface of the chassis 1. Since the shaft holding portion 13 is formed integrally with the positioning member 11, the disk drive motor 3 is mounted on the chassis 1 and the shaft holding portion 13 is mounted on the chassis 1 at a predetermined mounting position. In addition, the shaft holding portion 13 is positioned at a predetermined position with respect to the mounting position of the disk drive motor 3, so that the conventional positioning operation using a gauge is not required, and it is easy. Guide shaft 6
At a predetermined position with respect to the mounting position of the disk drive motor 3. FIGS. 4A to 4D are enlarged views of the positioning member 11. FIG. As shown in FIG. 4A, a base 1 is provided on the lower surface of the motor mounting portion 12 of the positioning member 11.
Annular first to third projecting portions 15 projecting downward from 1a
To 17 are provided in the circumferential direction at 90-degree intervals. The end surfaces of the first to third protrusions 15 to 17 function as contact surfaces that contact the lower surface of the chassis 1, and are provided near the first protrusion 15 and the third protrusion 17. Reference bosses (reference portions) 18 and 19 for positioning protrude. An insertion hole 20 into which the end of the guide shaft 6 is inserted from the side is provided on the lower surface of the shaft holding portion 13 of the positioning member 11, and a mounting screw insertion hole 21 is provided adjacent to the insertion hole 20. Is provided. As shown in FIG. 4C, on the upper surface of the motor mounting portion 12 of the positioning member 11, annular fourth to sixth protruding portions 22 to 24 protruding upward from the base 11a are arranged at 90-degree intervals in the circumferential direction. It is provided in. The end faces of the fourth to sixth protrusions 22 to 24 are
The first protrusion 22 functions as a contact surface that contacts the upper surface of the mounting base 3 b of the disk drive motor 3.
, A positioning boss 25 protrudes. An insertion hole 20 through which the end of the guide shaft 6 is inserted from the side and a mounting screw insertion hole 21 penetrate the upper surface of the shaft holding portion 13 of the positioning member 11. A positioning boss 26 protrudes adjacent to the hole 21. The first to third projections 15 to 17 and the fourth
To the sixth protrusions 22 to 24 are provided at the same corresponding positions, respectively, and the respective protrusions 15 to 17 and 22 to 24
, Mounting screw insertion holes 27 to 29 penetrate. FIG.
As shown in (B), the insertion hole 20 is provided in the positioning member 11.
Has an opening 30 that opens to the side of the guide shaft 6 through which the guide shaft 6 is inserted. In addition, the positioning member 1
1, only a part of the insertion hole 20 is visible on the upper and lower surfaces, and the end of the guide shaft 6 is inserted through the opening 30 into the insertion hole 2.
0, it is held by the horizontal portion 20a and the step portion 20b of the insertion hole 20. Here, the positioning member 1 configured as described above
1 and the mounting directions of the disk drive motor 3 and the guide shaft 6 will be described. FIG. 5 is a plan view showing the positioning between the positioning member 11 and the disk drive motor 3. The mounting base 3b of the disk drive motor 3 is provided with positioning reference holes 31, 32 at intervals of approximately 180 degrees. Then, the positioning reference bosses 18 and 19 projecting from the lower surface of the mounting base 3b are inserted into the reference holes 31,
32. Thus, the relative position between the mounting base 3b and the positioning member 11 is determined. [0030] In the mounting base 3b, the distance L _A between the reference hole 31 and the spindle shaft 3c is sized provisions. The reference boss 18 and the guide shaft 6 is fitted into the reference hole 31 is spaced a distance L _B between the center position of the insertion hole 20 to be retained is dimensioned provisions. Therefore, the relative position between the spindle shaft 3c and the guide shaft 6 is positioned at a predetermined position by mounting the mounting base 3b to the motor mounting portion 12 of the positioning member 11. Subsequently, the bosses 25 and 26 projecting from the upper surface of the positioning member 11 are inserted into the positioning reference holes 3 of the chassis 1.
3, 34. Then, the mounting screw 14 is inserted from below the mounting base 3b into the mounting screw insertion holes 27 to 29 and the mounting screw insertion hole 21 of the positioning member 11 via the mounting screw insertion hole 3d, and the screw hole 1a of the chassis 1 (FIG. 3). ). Thus, the disk drive motor 3 is fixed to the predetermined mounting position of the chassis 1 via the positioning member 11 and the insertion hole 2 of the guide shaft holding portion 13
The zero attachment position is positioned. Thereafter, the end of the guide shaft 6 is inserted from the opening 30 into the insertion hole 20, and
0a and the step 20b. Then, a shaft holding member 9 for holding the other end of the guide shaft 6 is fixed to the chassis 1. Thus, the positioning member 11
Motor mounting part 1 to which disk drive motor 3 is mounted
2 and the shaft holding portion 13 for holding the end of the guide shaft 6 are integrally provided, so that the shaft holding portion 13 can be positioned at a predetermined position with respect to the disk drive motor 3 at the same time when it is mounted on the chassis 1. As described above, the mounting position of the guide shaft 6 can be set to a predetermined position simply and in a short time without using a gauge. The other end of the guide shaft 6 is held by a shaft holding member 9 as in the conventional case. Further, both ends of the other guide shaft 5 are held by the shaft holding member 8 as in the conventional case. FIG. 6 is a longitudinal sectional view of a modification of the present invention, and FIG. 7 is a perspective view of the modification of the present invention. A motor mounting base 41 has a motor supporting portion 41a for supporting the disk drive motor 3. In the motor mounting base 41, a chassis mounting portion 42 mounted on the chassis 1 and a shaft holding portion 43 for holding an end of the guide shaft 6 are integrally formed. On the motor mounting base 41, like the positioning member 11, the upper surface of the chassis mounting portion 42 is provided.
Fourth to sixth annular protruding portions 22 to 24 protruding upward from the base 11a are provided in the circumferential direction at intervals of 90 degrees. The end surfaces of the fourth to sixth protrusions 22 to 24 function as contact surfaces that contact the lower surface of the chassis 1, and a positioning boss 2 is provided near the first protrusion 22.
5 are protruding. In the upper surface of the shaft holding portion 43, the insertion hole 20 into which the end of the guide shaft 6 is inserted from the side.
In addition, the mounting screw insertion hole 21 penetrates, and a positioning boss 26 protrudes adjacent to the mounting screw insertion hole 21. That is, the positioning member 11 is provided integrally with the motor mounting base 41, and the disk drive motor 3 is mounted at a predetermined mounting position of the chassis 1 by mounting the motor mounting base 41 to the chassis 1. At the same time, the shaft holding portion 43 is mounted at a predetermined mounting position, and the relative position between the spindle shaft 3c of the disk drive motor 3 and the guide shaft 6 is positioned at the predetermined position. In this modification, the chassis mounting portion 42 and the shaft holding portion 43 are integrally provided on the motor mounting base 41, so that the effects of the above-described embodiment are obtained and the positioning member 11 becomes unnecessary. The number of parts can be reduced, and the mounting accuracy of the chassis mounting portion 42 and the shaft holding portion 43 can be further increased. The motor mounting base 41 may be integrally formed of a synthetic resin material, or may be integrally formed of a sheet metal or aluminum die-cast. In the above embodiment, the magneto-optical disk device is described as an example. However, the present invention is not limited to this, and it is needless to say that the present invention can be applied to an optical disk device using an optical head. As described above, according to the present invention , the engaging portion engaging with the reference portion of the disk motor and the shaft holding portion holding the guide shaft are formed via the positioning member integrally formed. As a result, the disk motor and the guide shaft can be attached to the chassis, so that the relative positional accuracy between the disk motor and the guide shaft can be ensured. In addition, the reference portion of the disk motor is
It can be attached to the positioning member by engaging the joint
Therefore, the volume of the disc motor is independent of the guide shaft.
Can be easily attached and detached. Therefore, the disk
When performing motor maintenance, install the guide shaft.
Remove the disk motor only without moving the position and quickly
Maintenance can be performed. Further, it is not necessary to perform a complicated positioning operation using a gauge as in the related art, and the operation time in the assembly process can be reduced. [0040]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of an embodiment of a disk drive according to the present invention. FIG. 2 is a longitudinal sectional view of a main part of the present invention. FIG. 3 is an exploded perspective view of a main part of the present invention. FIG. 4 is a diagram showing a shape of a positioning member. FIG. 5 is a plan view for explaining a step of attaching a disk drive motor to a positioning member. FIG. 6 is a longitudinal sectional view of a modified example of the present invention. FIG. 7 is a perspective view of a modification. FIG. 8 is a plan view for explaining a conventional configuration. FIG. 9 is a longitudinal sectional view for explaining a conventional configuration. FIG. 10 is a diagram for explaining positioning using a conventional gauge. [Description of Signs] 1 Chassis 2 Turntable 3 Disk drive motor 3b Mounting base 4 Optical head 5, 6 Guide shaft 3b Mounting base 8, 9 Shaft holding member 11 Positioning member 12 Motor mounting portion 13 Shaft holding portions 15 to 17 First Third to third projections 18, 19 Reference boss 20 Insertion hole 22 to 24 Fourth to sixth projections 25, 26 Boss 27 to 29 Mounting screw insertion hole 30 Opening 31, 32, 33, 34 Reference hole 41 Motor Mounting base 42 Chassis mounting part 43 Shaft holding part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 19/20 G11B 33/12

Claims (1)

(57) [Claims] 1. A base having a predetermined positional relationship with respect to a rotation axis.
A disk supporting the disk via the rotating shaft;
A disk motor that rotates the table, Write / read signals to / from the disk
Guides the optical head so that it can move in the disk radial direction
The guide shaft is connected to the disc to be attached to the chassis.
In the device An engaging portion that engages with the reference portion of the disc motor;
The shaft holding part that holds the guide shaft is integrated
MoldingThat is mounted on the chassis.
Has a member, The disk motor engages the reference portion with the engagement portion.
And attached to the positioning member, The guide shaft has an end portion held by the shaft holding portion.
And attached to the positioning member. Features
Disk device.