JPH0416281Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a disk drive device for recording and reproducing information signals on a disk such as a magnetic disk.

[Conventional technology]

Conventionally, a disk drive device has been used which records and reproduces information signals using a disk cassette constructed by housing a flexible magnetic disk in a cassette half.

As a disk cassette used in this disk drive device, a disk cassette containing small diameter magnetic disks is used. The magnetic disk housed in this small disk cassette is constructed by attaching a disk hub encased by a sheet metal to the center. This disk hub has a central hole in its center that is rotated by a drive motor and engages a spindle shaft, and a turntable that rotates together with the spindle shaft is placed eccentrically with respect to the center hole. A drive pin engagement hole is bored into which a drive pin that functions as a positioning member for the installed magnetic disk is engaged.

The magnetic disk is mounted on the turntable by engaging the center hole with the spindle shaft and engaging the drive pin engagement hole with the drive pin, and is positioned with respect to the turntable. It is rotated as one unit. The above-mentioned magnetic disk is rotated integrally with the turntable and a magnetic head, which is fed in the radial direction of the above-mentioned magnetic disk by a stepping motor, comes into sliding contact with the turntable, thereby recording and reproducing predetermined information signals. will be held.

Incidentally, in order to position the recording start point of an information signal on the recording track formed on the magnetic disk and to position the reproduction start position, a pulse generator is provided on the disk drive device side. This pulse generator includes a magnetized part as a detection part, which is magnetized in the rotor of the drive motor in a direction different from that of the rotor magnet, and the magnetized part, which is arranged at a position facing the rotor. It is composed of a Hall element as a detection element for detecting the area.

The magnetized part that constitutes the above pulse generator is
It has a fixed positional relationship with respect to the drive pin arranged on the turntable. Therefore, the rotational position of the turntable is determined based on the detection output of the Hall element that detects the magnetized portion, and the recording start position or reproduction start position of the information signal on the magnetic disk is determined.

The magnetized part that constitutes a conventional pulse generator is formed by attaching a magnetic sheet piece to the rotor of the drive motor in advance, or by magnetizing a part of the rotor so that the magnetization is different. A turntable is attached to a spindle shaft that is integrated with the rotor so that the drive pin is in a predetermined positional relationship with the magnetized portion.

[The problem that the idea attempts to solve]

In this way, conventional disk drive devices have to perform a process in advance to align the drive pins of the turntable and the magnetized portion of the rotor in order to determine the recording start position or playback start position of the recording track of the magnetic disk. After the rotor is provided with a magnetized portion, the turntable is attached to the spindle shaft, and errors may occur in the mounting position of the turntable due to manufacturing variations.

Therefore, in conventional disk drive devices, the accuracy of phase alignment between the drive pin and the magnetized part is insufficient.
It is not possible to determine the signal recording start position or reproduction start position of the recording track with high precision.

Therefore, the present invention solves the conventional problems and accurately aligns the phase between the drive pin as a positioning member of the disk disposed on the turntable and the magnetized part as a detection part provided on the rotor of the drive motor. This was proposed for the purpose of providing a disk drive device that can be easily operated.

[Means to accomplish the task]

In order to achieve the above-mentioned object in a disk drive device that rotationally drives a disk, the present invention includes a chassis that rotatably supports a spindle shaft via a bearing, and a chassis that rotatably supports a spindle shaft through a bearing, and a chassis that rotatably supports a spindle shaft through a bearing. a turntable on which a press-fitted disk on the tip side protruding from the upper surface of the chassis of the spindle shaft is placed; a disk positioning member disposed on the turntable; and a turntable configured to rotate integrally with the spindle shaft. A rotor having a rotor case and a rotor magnet supported on the proximal end side of the spindle located on the lower surface side of the chassis, and a stator coil disposed opposite to the rotor magnet, the rotor being fixed to the chassis. a first stator provided on the stator, a detection element provided on the stator for detecting the rotational status of the turntable by detecting a predetermined detection portion provided on the rotor, and a first detection element provided on the turntable. a hole, a second hole provided in the chassis, and a third hole provided in the rotor, the first hole, the second hole, and the third hole. By passing a phase alignment jig through the spindle shaft, the phase relationship between the positioning member on the turntable side and the detection unit on the rotor side can be adjusted with respect to the spindle shaft.

[Effect]

The disk drive device according to the present invention includes a turntable, a chassis, and a rotor, which are precisely attached to a spindle shaft.
By passing the alignment jig through the hole, the positioning of the phase relationship between the positioning member and the detection unit can be determined while maintaining the positioning accuracy of the detection unit with respect to the positioning member of the turntable with high precision. It will be done.

〔Example〕

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

The disk drive device according to the present invention includes a turntable 17 that is rotatably operated by a drive motor 5 on which a flexible magnetic disk 3 housed in a cassette half 2 of a disk cassette 1 is positioned and mounted. A device 4 is provided. A drive motor 5 constituting this disk rotation drive device 4 is connected to a spindle shaft 7 on a chassis 7.
The rotor block 8 including the rotor block 8 is directly supported.

The chassis 6 is formed of aluminum die-casting or the like, and has a truncated conical shaft insertion portion 9 projecting from the lower surface of the portion constituting the drive motor 5 . A pair of bearings 1 is provided in this shaft insertion portion 9.
0 and 11 are disposed, and the spindle shaft 7 is rotatably supported by the chassis 6 via these bearings 10 and 11. At the lower end of the spindle shaft 7, which protrudes downward from the shaft insertion portion 9 in FIG. They are integrally attached by fitting the vertical fitting holes 15 into each other. This magnetic holder 14 has a rotor case mounting portion 14b rising up from the outer circumference of the mounting portion 14a of the spindle shaft 7 in which a fitting hole 15 is provided, and is formed to have a cylindrical shape as a whole. It is attached to the spindle shaft 7 so as to surround the insertion portion 9.

The rotor case 13 constituting the rotor block 8 is attached by caulking a fitting hole 16 formed in the center to the upper end of the rotor case attachment block 14b of the magnetic holder 14. Further, the rotor magnet 12 is attached to the lower surface of the rotor case 13 by bonding or the like. Further, the rotor case 13 has a first jig insertion hole 1 as a first hole through which a phase alignment jig 27 bored in the turntable 17 is inserted.
8, that is, coaxially with the first jig insertion hole 18.
A third jig insertion hole 20 is formed as a third hole portion through which the jig 7 is inserted. The diameter of the third jig insertion hole 20 is made approximately equal to the outer diameter of the phase alignment jig 27.

Furthermore, a plurality of stator coils 21 are arranged at positions facing the rotor magnet 12. These stator coils 21 are connected to the first coils of a printed wiring board 22 attached to the bottom surface of the chassis 6.
It is bonded to the main surface on the bottom side in the figure. The mounting position of the printed wiring board 22 is determined by being supported by four positioning pins 23 that are inserted through through holes 24 and are supported by four positioning pins 23 that determine the mounting position of the disk cassette 1 mounted on the turntable 17. Then, the printed wiring board 22
is a plurality of stator coils 2 arranged in a ring shape.
The magnetic holder 14 is inserted through a through hole 22a drilled in the center of the chassis 6, and fixed to the lower surface of the chassis 6 with screws 25 as shown in FIG.

Further, a Hall element 26 as a detection element is attached to the printed wiring board 22 on the side where the stator coil 21 is disposed. This Hall element 2
6 is disposed at a position coaxial with the first jig insertion hole 18 and the third jig insertion hole 20, and is aligned with the rotor magnet 12 by the phasing jig 27.
Detects the magnetic flux of the magnetized section 28, which is a detection section that is magnetized at the portion. This magnetized portion 28 and the Hall element 26 constitute a pulse generator.

Here, the positioning pin 23 is connected to the chassis 6.
It is installed by inserting it into the mounting hole 29 drilled in the
The distal end portion of the chassis 6 that protrudes toward the upper surface side serves as a positioning portion for the disk cassette 1, and the proximal end portion of the chassis 6 that protrudes toward the lower surface side serves as a positioning portion for the printed wiring board 2.
2 positioning attachment part. By attaching the positioning pins 23 to the mounting reference surface of the chassis 6 with high precision, the printed wiring board 22 attached via the positioning pins 23 can also be positioned with high precision and
Becomes attached to.

Further, a disk-shaped rotor yoke 30 is fitted into the magnet holder 14 through a small-diameter yoke attachment portion 14c formed at the base end thereof. Furthermore, a pressing plate 31 made of a magnetic material is attached to the chassis 6 via screws 25 on the lower surface side of the printed wiring board 22. This pressing plate 31 is
It surrounds the rotor yoke 30, is attached to the lower surface side of the printed wiring board 22, and covers the stator coil 21 facing outward. The press plate 31 and the rotor magnet 12 attached in this manner attract each other and act on the rotor block 8 including the spindle shaft 7 to generate a thrust force toward the lower side of the chassis 6.

Further, a turntable 17 is integrally attached to the tip of the spindle shaft 7 that protrudes toward the upper surface side of the chassis 6 via a shaft fitting member 32 . A drive pin 35 is attached to a position eccentric to the center of the turntable 17, which engages with a drive pin engagement hole 34 formed in a disk hub 33 attached to the center of the magnetic disk 3. The drive pin 35 is inserted into the drive pin engagement hole 35 when the magnetic disk 3 is mounted on the turntable 17 and rotated integrally with the turntable 17.
The magnetic disk 3 functions as a positioning member that presses against the magnetic disk 3 to determine the mounting position of the magnetic disk 3 with respect to the turntable 17.

The drive pin 35 is supported by the turntable 17 via a rotation lever 36 which is biased to rotate by a spring.

Further, a center hole 35 formed in the center of the disk hub 33 is engaged with the tip of the spindle shaft 7.

Furthermore, on the top surface of the turntable 17,
A magnet 38 is provided to attract the disk hub 33 attached to the magnetic disk 3.

Incidentally, the turntable 17 is provided with a first jig insertion hole 18 located on a line connecting the spindle shaft 7 and the drive pin 35 and serving as a first hole through which the phase alignment jig 27 is inserted. It is set up. The first jig insertion hole 18 is formed to have a diameter substantially equal to the outer diameter of the phase alignment jig 27. Further, the chassis 6 has a second jig insertion hole 19 as a second hole member through which the phasing jig 27 is inserted so as to be positioned coaxially with the first jig insertion hole 18. It is perforated. This second jig insertion hole 19 is connected to the phase alignment jig 27.
The hole is drilled with a slightly larger diameter than the outside diameter of the hole. Further, the rotor case 13 has a third hole portion through which the phasing jig 27 is inserted so as to be positioned coaxially with the first jig insertion hole 18 bored in the turntable 17. jig insertion hole 2
0 is provided. This third jig insertion hole 20
The diameter is approximately equal to the outer diameter of the phase matching jig 27.

In this way, the first, second, and third jig insertion holes 18 and 19 through which the phase alignment jig 27 is inserted are inserted into the chassis 6, the turntable 17, and the rotor case 13, which are arranged opposite to each other with the chassis 6 in between. ,2
0 is drilled so that it communicates coaxially,
With the turntable 17 attached to the spindle shaft 7, the first, second and third
A rod-shaped phasing jig 27 can be inserted through the jig insertion holes 18, 19, and 20. and,
When the phase matching jig 27 is inserted, the top surface of the rotor magnet 12 is magnetized using the phase matching jig 27 so that the direction of magnetization is different from that of the magnet 12, and the rotor magnet 12 is magnetized in a direction different from that of the magnet 12. A magnetized portion 28 is formed. That is, the magnetizing section 28 is magnetized while the relative positional relationship between the drive pin 35 disposed on the turntable 17 and the magnetizing section 28 is maintained constant.

After forming the magnetized portion 28 as described above, the first, second and third jig insertion holes 18, 19, 20
By inserting a jig for adjusting the attachment position and attaching and fixing the turntable 17 to the spindle shaft 7, the drive pin 35 and the magnetized portion 28 can be aligned with high precision.

Then, the drive pin 3 of the turntable 17
5 and the magnetized portion 28 of the rotor magnet 12 is performed with high precision, the recording or reproduction start position of the information signal on each recording track of the magnetic disk 3 can be determined with high precision. .

[Effect of idea]

As described above, the present invention provides a chassis, a turntable and a rotor that are arranged opposite to each other with the chassis in between, and a first hole, a second hole, and a third hole through which the phasing jig passes. Therefore, it is possible to easily form a magnetized portion as a detection portion on the rotor magnet by inserting a phase matching jig into each of the holes.

By attaching the turntable to the spindle shaft using the first hole, the second hole, and the third hole, the drive pin as a positioning member disposed on the turntable and the magnetized portion are attached. Phase alignment can be performed accurately and easily.

Therefore, the recording or reproduction start position of the information signal on each recording track of the disk can be determined with high precision, and a disk drive device with extremely good recording and reproduction characteristics can be constructed.

Furthermore, by forming the first hole, the second hole, and the third hole in communication with each other on the same axis, the position of the turntable can be determined by visual inspection using the hole. It becomes possible to perform phase alignment between the drive pin as a member and the magnetized section as a detection section, and the above-mentioned phase alignment operation becomes extremely easy.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a main part of a disk drive device according to the present invention, and FIG. 2 is a bottom view showing a stator coil portion of a drive motor of the device. 1... Disk cassette, 3... Magnetic disk, 5... Drive motor, 6... Chassis, 7...
Spindle shaft, 12...Rotor magnet, 13
...Rotor case, 17...Turntable, 1
8...First jig insertion hole, 19...Second jig insertion hole, 20...Third jig insertion hole, 21...Stator coil, 26...Hall element, 27...Phase alignment Jig, 28... Magnetized section, 33... Disk hub, 35... Drive pin.

Claims (1)

[Claims for Utility Model Registration] A disk drive device that rotationally drives a disk, comprising: a chassis that rotatably supports a spindle shaft via a bearing; and an upper surface of the chassis of the spindle shaft so as to rotate together with the spindle shaft. a turntable on which a disk is press-fitted and fixed on the tip side protruding from the turntable; a disk positioning member disposed on the turntable; and a lower surface of the chassis of the spindle so as to rotate together with the spindle shaft. a rotor having a rotor case and a rotor magnet supported on a proximal end side thereof; a stator fixed to the chassis and having a stator coil disposed opposite to the rotor magnet; a detection element provided on the stator that detects the rotation status of the turntable by detecting a predetermined detection portion provided on the stator; a first hole provided on the turntable; a second hole provided in the rotor, and a third hole provided in the rotor, and a phase alignment jig is provided in the first hole, the second hole, and the third hole. A disk drive device in which a phase relationship between a positioning member disposed on the turntable and a detecting section disposed on the rotor is adjusted with respect to the spindle shaft by penetrating the rotor.