JPH058034U - Motor shaft bearing structure - Google Patents

Abstract

(57) [Summary] [Purpose] The object is to enable vertical movement of a motor shaft to which a turntable is fixed so that a laser light spot emitted from an optical pickup is focused on a disk surface. [Structure] A housing 5 in which a thread groove 3 is formed inside a cylindrical shape attached to a stator 1 of a motor and a bearing bearing 4 is attached to a lower end thereof, and a bearing bearing 4 is attached to one end of the housing 5. The bearing spacer 7 with the thread groove 3 formed on the
The motor shaft 9 to which 11 is fixed is attached to the bearing spacer 7
And the bearing bearing 4 of the housing 5 are inserted, the bearing retainer 12 and the compression spring 13 are inserted at the lower end, and the rotor base 16 to which the rotor 15 is attached is fitted and fixed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The optical disk medium is rotated to irradiate the disk with a laser beam spot, and the reflected light Spin on a CD-ROM writer, etc., that picks up and records and reproduces information signals The present invention relates to a bearing structure of a dollar motor.

[0002]

[Prior art]

  Conventionally, by rotating an optical disk medium such as a CD-ROM writer, a laser beam spot It illuminates the disk medium, detects the reflected light with an optical pickup, and records the information signal. In a recording / reproducing device, a minute laser beam spot emitted from an optical pickup Of the optical pickup and the disc The gap between the optical disc and the disk medium is required to be accurate, so the optical head and the rotating mechanism are The dimensional accuracy and assembly accuracy of the components of the parts are important factors that determine the performance of the equipment. I was there. However, for the eccentric runout of the track of the disk, the optical head should be A tracking function that oscillates and follows it, and an optical Focusing system in which the focus lens of the backup It is equipped with a tracking function and compensates for some distortion of the disc However, it has more than the distortion that cannot be corrected by the focusing function. The gap between the disk and the disk medium is the turntable for mounting the disk as shown in FIG. It does not have the function of moving the bull up and down and focusing Although it is not, it is used to irradiate the laser beam spot onto the disk medium vertically. Use the tilt mechanism that tilts the base with the head attached to adjust it. Was there.

[0003]

[Problems to be solved by the device]

  As mentioned above, the optical pickup is not affected by the fluctuation of the surface of the disk medium or the track. In order to install the optical pickup and the disk medium in the interval of the followable range, It is necessary to maintain the dimensional accuracy and assembly accuracy of the components of the optical head and rotation mechanism. There is a cost because it was there, and if there is a problem as a result of assembly, it is necessary to adjust the interval Adjust the interval by changing the fulcrum position of the tilt mechanism that is not provided on the Laser light spot must be adjusted so that it is emitted perpendicularly to the disc surface. A complex adjustment was needed to satisfy the two factors at the same time.

[0004]

[Means for Solving the Problems]

  In order to solve the above problems, a hole for inserting the motor shaft is provided at the center, and the lower end Bearings are attached to the upper part of the In the housing attached to the motor, a hole for inserting the motor shaft is provided in the center, Attach a bearing bearing to one end, and form a thread groove that engages with the thread groove on a part of the outer circumference. The bearing spacer that has been made is inserted and screwed, and the turntable is fixed to the upper end. Insert the shaft into the bearing spacer and the bearing in the housing. Then, the rotor of the motor is connected to the lower end of the motor shaft through a bearing retainer and a compression spring. Provided is a motor shaft bearing structure characterized in that a bearing is fixed.

[0005]

[Action]

  Bearing bearings and housing mounted on the bottom edge of the housing as described above Bearing spacers that are inserted and screwed into the shaft to move up and down by rotating Bearing mounted on the motor The shaft is slidably inserted and the lower end is inserted through the bearing retainer and compression spring into the rotor. The motor shaft is always pulled downward by attaching and fixing the The bulls now come into contact with the bearing bearings of the bearing spacers. By rotating and moving up and down, the turntable fixed to the motor shaft is Since the bull moves up and down together with the upper end of the bearing spacer, The distance can be easily adjusted.

[0006]

【Example】

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Fig. 1 is the present invention 3 is a cross-sectional view of an example of a motor shaft bearing structure according to FIG.

[0007]   In the figure, 1 is a stator including a coil 2 of a spindle motor, A thread groove 3 is formed in a part of the upper inside of the cylinder, and a bearing bearing 4 is attached to the lower end. The digit housing 5 is fixed. An opening is formed at an appropriate position on the middle part of the housing 5. 6 is provided so that the bearing spacer 7 screwed inside can be rotated. ing. Reference numeral 6 designates a thread groove 3 on a part of the outer circumference of the cylinder, and a bearing bearing on the upper end. 4 is attached and a plurality of tool insertion holes 8 for rotation are provided at the lower end so as to penetrate the cylindrical wall. This is a bearing bearing spacer, which is screwed into the housing 5 to rotate. It is designed to move up and down. Also, engage the upper end with a wrench, You may make it rotate by providing a square screw head. 9 has a disc 10 on the top A motor shaft to which a turntable 11 is fixed and which has a bearing spacer 7 And the bearing mounted on the housing 5 are slidably inserted into the bearing 4, A shaft which is brought into contact with the bearing bearing 4 of the housing 5 at the lower end protruding toward the data 1 side. Insert the work clamp 12 and the compression spring 13 and install the rotor 15 with the magnet 14. The rotor base 16 is fitted and fixed.

[0008]   As described above, the bearing spacer 7 is attached to the housing 5 attached to the stator 1. It is screwed and turned on the bearing 5 of the housing 5 and the bearing spacer 7 of the bearing spacer 7. Insert the motor shaft 9 with the bull 11 fixed at the upper end, and the bearing retainer 12 and the compression bar at the lower end. Insert the nut 13 and fit and fix the rotor base 16 with the rotor 15 attached to the motor. Since the shaft 9 is always pulled downward, the lower end of the turntable 11 is The bearing of the pacer 7 comes into contact with the inner ring of the bearing 4, and By rotating the pacer 7, the turntable 11 on which the disc 10 is placed is moved. Can be moved up and down.

[0009]

[Effect of device]

  Bearing bearings and housing mounted on the bottom edge of the housing as described above Bearing spacers that are inserted and screwed into the shaft to move up and down by rotating Bearing mounted on the motor The shaft is slidably inserted and the lower end is inserted through the bearing retainer and compression spring into the rotor. The motor shaft is always pulled downward by attaching and fixing the The bulls now come into contact with the bearing bearings of the bearing spacers. By rotating and moving up and down, the turntable fixed to the motor shaft is Since the bull moves up and down together with the upper end of the bearing spacer, The fact that the distance can be easily adjusted is a component of the optical head unit and the rotation mechanism unit. The laser light spot can be disc-shaped without stricting the dimensional accuracy and assembling accuracy. No need to adjust the distance by using the tilting mechanism to irradiate the surface vertically. This also reduces costs and eliminates complicated adjustments, which is economically beneficial. It is noticeable to let it go.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a motor shaft bearing structure according to the present invention.

FIG. 2 is a sectional view of an example of a conventional motor shaft bearing structure.

[Explanation of symbols]

1 stator 2 coils 3 screw groove 4 bearing bearing 5 housing 6 openings 7 Bearing spacer 8 Tool insertion hole 9 motor shaft 10 disk media 11 turntable 12 Bearing retainer 13 Compression spring 14 magnet 15 rotor 16 rotor stand

Claims (2)

[Scope of utility model registration request] Claim: What is claimed is: 1. A hole for inserting a motor shaft is provided in the center, a bearing bearing is attached to the lower end, a screw groove is formed in a part of the upper inside, and the motor shaft is attached to the center of the housing. A motor shaft with a through hole is provided, a bearing bearing is attached to one end, and a bearing spacer with a thread groove to be screwed into the thread groove is inserted and screwed into a part of the outer periphery, and a turntable is fixed to the upper end. A motor shaft bearing structure in which a spacer and a bearing bearing of a housing are respectively fitted and a rotor of a motor is fixed to a lower end of the motor shaft via a bearing retainer and a compression spring. 2. An opening is provided in the middle part of the housing, a plurality of holes are provided in a part of the outer periphery of the bearing spacer exposed from the opening, and the bearing spacer is rotated through the holes. The motor shaft bearing structure according to Item 1.