JPS63124280A - Holding mechanism for guide spindle - Google Patents

Abstract

PURPOSE:To perfectly adjust the height of a guide spindle and also the degree of parallelism of each of a disk and a pair of guide spindles by providing a height adjusting mechanism with a screw or a wedge part for adjusting the height, at the end part of the guide spindle. CONSTITUTION:The guide spindle 6 is held by a vertical wall surface 7a, formed at the frame block 7, and by the end surface of the height adjusting screw 11, and fixed by a fixing fitting 8. By rotating the height adjusting screw 11, the height of the end surface of the adjusting screw is adjusted, and after adjustment it is fixed by a lock nut 12. Regarding the adjustment of the degree of the parallelism between the disk and the guide spindle 6, a displacement sensor is attached on a slider and the slider is moved in the radial direction of the disk, while the output of the displacement sensor being observed, and if the change of the output does not arise, it means that the guide spindle has been adjusted to be parallel with the radial direction of the disk. The displacement sensors are attached respectively at positions equivalent to the positions of the pair of the guide spindles 6, and if the outputs of two displacement sensors are made to be equal, the heights of the two guide spindles can be made to be equal respectively and also the adjustment is easy.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a guide shaft holding mechanism for an optical disk recording and reproducing device.

BACKGROUND OF THE INVENTION In recent years, optical disk drive devices have been rapidly developed because optical disks have a large capacity and can be accessed at high speed. In order to perform high-speed access, mechanisms for moving the optical head at high speed, particularly optical head guide mechanisms and guide shaft holding mechanisms, have become important.

A conventional guide shaft holding mechanism will be described below with reference to the drawings.

FIG. 3 is a sectional view of a conventional guide shaft holding mechanism, FIG. 4 is a plan view of a drive device using the conventional guide shaft holding mechanism, and FIG. 5 is a sectional view taken along line a-a in FIG. 4. Further, FIG. 3 is a sectional view taken along line bb in FIG. 4.

, 4 and 6, reference numeral 1 denotes a disk, which is placed on a tartable 3 provided on a spindle motor 2. In FIG. Then, it is rotated by a spindle motor 2. 9 is an optical head facing the recording surface of the disc 1;
It is mounted on slider 4. Bearings 5 are provided on both sides of the slider 4, and are slidably supported on a pair of guide shafts e.

The pair of guide shafts 6 are held parallel to each other in order to smooth the movement of the slider 4.

FIG. 3 shows a bb section of the holding portion. In FIG. 3, 7 is a frame block, which is provided with a vertical wall surface 7a and a horizontal plane 7b in order to support the end of the guide shaft 6.
It's pressing against that corner. The guide shaft 6 is fixed with a fixing fitting 8.

The guide shaft holding mechanism configured as described above has high dimensional accuracy because the four vertical walls 7a and the horizontal plane 7b provided on the frame block 7 can be machined in the same way with a milling machine, and the pair of guide shafts 6 can be held parallel to each other, so the movement of the slider 4 can be made smooth.

Problems to be Solved by the Invention However, due to the inclination of the shaft of the spindle motor 2 and the machining accuracy of the flange portion 2a of the spindle provided for attaching the spindle motor 2 to the frame block 7, the disk 1 may be attached at an angle. There is a risk of being hit. When the disk 1 is tilted, a relative tilt error occurs between the disk and the opposing optical head. Optical head 9 and disk 1
If there is an error in the relative mounting angle with respect to the recording surface, aberrations of the light spot formed on the recording surface will occur, resulting in increased crosstalk and deterioration of frequency characteristics. Furthermore, since the parallelism between the guide shaft and the disk depends on the precision of machining, the disk inclination differs between machines, so the characteristics of the optical head vary greatly between machines.

In order to compensate for this drawback, there is an idea to provide a part of the slider with an optical head inclination circumference adjustment mechanism to adjust the relative mounting angle between the optical head and the disk, but the slider part is large and the high-speed access is possible. Another new drawback arises in that unnecessary vibrations sometimes occur. Furthermore, when replacing the head, it is difficult to readjust it.

Furthermore, since the disk is tilted, the relative distance between the disk and the optical head changes depending on the radial position of recording and reproduction, which has a negative effect on focus servo.

In view of the above problems, the present invention provides a guide shaft holding mechanism that allows the disk and the guide shaft to be perfectly parallel to each other and to always use the characteristics of the optical head in the best condition.

Means for Solving the Problems To achieve this objective, the guide shaft holding mechanism of the present invention comprises:
It is configured to have a height adjustment mechanism consisting of a support base having threaded portions or wedge portions at both ends of a pair of guide shafts.

Function: With this configuration, by adjusting the mounting height of both ends of the guide shaft based on the attached disk, it is possible to align the disk and the guide shaft completely parallel to each other.

EXAMPLE An example of the present invention will be described below with reference to the drawings. FIG. 1 shows a sectional view of a guide shaft holding mechanism in an embodiment of the present invention.

The cross section corresponds to the bb section in FIG. 4. The other configurations are the same as those of the conventional example, so explanations will be omitted.

In Fig. 1, 6 is a guide shaft, and frame block 7
It is held by a vertical wall surface 7a provided in the vertical wall surface 7a and the end face of a height adjustment screw 11, and is fixed with a fixing metal fitting 8. By rotating the height adjustment screw 11, the height of the end face of the adjustment screw is adjusted, and after adjustment, it is fixed with a lock nut 12.

To adjust the parallelism between the disc and the guide shaft, attach a displacement sensor to the slider, move the slider in the radial direction of the disc while observing the output of the displacement sensor, and if there is no change in the output, the adjustment can be made parallel to the radial direction of the disc. become. The displacement sensors are installed at locations corresponding to the positions of the pair of guide shafts 6, and by making the outputs of the two displacement sensors equal, the heights of the two guide shafts can be made equal, making adjustment easy. be.

FIG. 2 shows a sectional view of a guide shaft holding mechanism in another embodiment. The cross section corresponds to the bb section in FIG. 4. In FIG. 2, reference numeral 6 denotes a guide shaft that connects the vertical wall surface 7a provided on the frame block 7 and the support base 2.
It is held by a wedge part 1 and fixed by a fixing fitting 8.

The support base 21 is capable of sliding in the lateral direction of the frame block 7, and by adjusting the amount of sliding with the adjustment screw 21 and changing the position of the contact point between the wedge portion of the support base 21 and the guide shaft, the guide can be adjusted. The mounting height of the shaft can be adjusted. After adjustment, the support base 21° and the fixing bracket 8 are fixed together with the lock screw 23. The parallelism with the disk is adjusted as described above.

Effects of the Invention The present invention provides a height adjustment mechanism having a height adjustment screw or a wedge portion at the end of the guide shaft, so that the height and parallelism of the disc and the pair of guide shafts can be completely adjusted. Can be adjusted. Therefore, the error in the relative mounting angle between the disk and the optical head can be minimized, the occurrence of optical spot aberration can be suppressed, and the increase in crosstalk and deterioration of the two-frequency characteristics can be eliminated. In addition, since the disk and guide axis can be adjusted to be perfectly parallel for each device, the relative mounting angle of the head and disk will not vary between devices, and variations in optical head characteristics can be suppressed, making it possible to adjust head replacement. possible without.

Furthermore, since there is no change in disk height depending on the radial location of recording and reproduction, there is no adverse effect on focus servo.

By providing a height adjustment mechanism for the guide shaft, only the machining accuracy of the vertical wall surface can be improved, and other machining precisions can be roughened, making it possible to realize an excellent guide shaft holding mechanism that can reduce the machining cost of the entire drive. be.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a guide shaft holding mechanism according to an embodiment of the present invention, Fig. 2 is a sectional view of a guide shaft holding mechanism according to an embodiment of the present invention, and Fig. 3 is a sectional view of a conventional guide shaft holding mechanism. , FIG. 4 is a plan view of a drive device using a conventional guide shaft holding mechanism, and FIG. 5 is a sectional view taken along line a-a in FIG. 4. 1. River... Disk, 2... Spindle motor, 3... Turntable, 4... Slider, 6... Bearing, 6...・Guide shaft,
7...Frame block, 8...Fixing bracket, 9...Optical head, 11...Height adjustment screw, 12...Lock nut , 21...
...Support stand, 22...Adjustment screw, 23...
...Lock screw. Name of agent: Patent attorney Toshio Nakao and one other person
Dice game 2- Spindle motor 3- Turntable 4- Slider 5- Sleeve receiver 6-- Guide shaft 7-7 Rembrodug

Claims (2)

[Claims] (1) A pair of guide shafts installed parallel to a plane perpendicular to the disk, a height adjustment screw engaged with a frame block that supports the ends of the guide shafts, and a metal fitting for fixing the guide shafts. A guide shaft holding mechanism, comprising: an end surface of the height adjusting screw that supports an end of the guide shaft to adjust the height relative to the disk. (2) A pair of guide shafts installed parallel to a plane perpendicular to the disk, a support base having a wedge part that is slidable on a frame block that supports the ends of the guide shafts, and fixing the guide shafts. A guide shaft holding mechanism, comprising: a metal fitting for holding the guide shaft, the wedge portion of the support base supporting the end portion of the guide shaft and adjusting the height with respect to the disk.