KR20030076895A - Tilt adjusting apparatus for optical disc driver and optical disc driver using it - Google Patents

Abstract

PURPOSE: A device for controlling a tilt of an optical disk drive is provided to include three controlling screws for coupling a main base with a motor base and elevating the motor base by an elastic force of an elastic coupler, thereby controlling the tilt without changing absolute height of an optical disk. CONSTITUTION: A motor base installs a spindle motor(110) inside, and employs three small controlling holes(231,232,233). Three controlling screws(230) couple a main base(130) with the motor base by being connected to elastic bosses(220) through the controlling holes, and elevates the motor base by an elastic force of the elastic bosses. The motor base forms the 2 controlling holes in radial direction, on the basis of a rotation axis of the spindle motor, and forms the 1 controlling hole in tangential direction. The controlling screws are coupled with the elastic bosses through the controlling holes.

Description

Tilt adjusting apparatus for optical disc driver and optical disc driver using it}

The present invention relates to a tilt adjusting device for an optical disk drive, and more particularly, to a tilt adjusting device for adjusting an inclination of a spindle motor for rotating an optical disk.

In general, an optical disk drive is a device for recording information on or reading information from a recording surface consisting of concentric tracks on an optical disk. A pickup base sliding radially on an optical disk on a recording surface of an optical disk rotating in a linear speed manner. It refers to a device that records or reads data by radiating a beam from an actuator mounted on the device.

In order to accurately read the data recorded on the recording surface of the optical disk or to record the data accurately on the optical disk drive, the recording surface of the optical disk and the optical axis of the beam emitted from the actuator should always be maintained at a constant angle. However, the assembly of the pick-up base for sliding the actuator or the spindle motor for supporting and rotating the optical disk is bound to have an error, so that the optical axis and the signal surface of the optical disk deviate from a predetermined angle, which is called a tilt phenomenon.

This tilt phenomenon is divided into radial tilt indicating the sliding direction of the pickup base, that is, the radial tilt of the optical disk, and tangential tilt in the direction perpendicular to the radial direction, based on the optical disk surface. It is essential to adjust the tilt in the radial direction and the tangential direction in order to accurately enter the recording surface.

FIG. 1A illustrates a case where a spindle motor is adjusted as a tilt adjusting device of a conventional optical disk drive, and FIG. 1B illustrates a cross-sectional view taken along line B-B in FIG. 1A.

As shown in FIGS. 1A and 1B, three fastenings are coupled to the spindle motor 110 to which the hub 160 supporting the optical disc 170 is coupled to the rotating shaft 111, and to be coupled to the main base 130. It is installed between the motor base 120 having the parts 121, 122, 123, and the second fastening part 122 and the third fastening part 123 of the main base 130 and the motor base 120 to apply an elastic force. A reference bush provided between the coil spring 150 and the main base 130 and the first fastening portion 121 of the motor base 120 and having a curved portion 191 at the side facing the motor base 120 ( 190).

The first fastening part 121 is fixed to the main base 130 with the reference bush 190 therebetween by the fastening screw 141, and the second fastening part 122 and the third fastening part 123 are fastened to each other. In accordance with the tightening amount of the screws (142, 143) is lifted by the elastic force of the coil spring 150.

When the tightening amount of the fastening screw 142 of the second fastening part 122 is adjusted, the motor base 120 is moved up and down, and the curved part 191 is made with the reference bush 190 of the first fastening part 121 as the rotation axis. The slope changes along). In addition, if the tightening amount of the fastening screw 143 of the third fastening part 123 is adjusted, the motor base 120 is moved up and down, and the curved part is made with the reference bush 190 of the first fastening part 121 as the rotation axis. The inclination changes along 191.

Accordingly, by adjusting the tightening amounts of the fastening screws 142 and 143 of the second fastening portion 122 and the third fastening portion 123, the recording surface of the optical disc 170 and the actuator 101 mounted on the optical pickup portion 100 are radiated. The optical axis of the beam to be adjusted can be adjusted to achieve a predetermined angle.

However, in such a tilt adjusting device, since the height of the first fastening part 121 is fixed and adjusts the tightening amount of the second fastening part 122 and the third fastening part 123 based on the height, the tangential direction ( After the tilt adjustment in the T and radial directions R, the height of the optical disk 170 supported by the hub 160 is also changed. When the height of the optical disc 170 is lowered, the fatal problem of damaging the actuator 101 or damaging the data recorded on the recording surface of the optical disc 170 may come into contact with the pickup base 100 sliding in the radial direction of the optical disc 170. If the height of the optical disc 170 is increased, an external portion (not shown) surrounding the optical disc drive and a touch (TOUCH) may cause a failure or data corruption.

An object of the present invention is to provide a tilt adjusting apparatus for an optical disk drive, which is created to solve the above problems and does not change the height of the optical disk in the vertical direction.

1A is a diagram illustrating a tilt control apparatus of a conventional optical disk drive.

FIG. 1B is a cross-sectional view taken along the line B-B 'of FIG. 1A

2A is a view showing a tilt adjustment device of the optical disk drive of the present invention.

FIG. 2B is a cross-sectional view taken along the line CC 'of FIG. 2A

3 is a graph showing the vibration characteristics of the tilt adjustment device of the present invention.

<Description of Symbols for Main Parts of Drawings>

100 ...... Pick-up base 101 ...... Actuator

110 ...... Spindle Motor 130 ...... Main Base

160 ...... Hub R ...... Radial Direction

T ...... Tensual direction S ...... Spindle motor axial direction

210 ...... Motor Base 220 ...... Elastic Boss

230 ...... Adjustment screw 231,232,233

The tilt control apparatus of the optical disk drive of the present invention for achieving the above object is an optical disk drive in the optical disk drive for recording or reading information while sliding the pickup base mounted with the actuator in the radial direction of the optical disk rotated by the spindle motor And a tilt adjusting device of an optical disk drive for adjusting tilt of the actuator, comprising: a motor base provided with the spindle motor and having three adjustment holes; Three elastic coupling means installed on the main base and coupled to the motor base to impart an elastic force in a direction away from the main base; And three adjusting screws that are coupled to the elastic coupling means through the adjustment holes to simultaneously combine the main base and the motor base and to elevate the motor base by the elastic force of the elastic coupling means according to the amount of tightening. Characterized in that.

In addition, the optical disk drive of the present invention is characterized by adjusting the tilt of the optical disk and the actuator by providing the above-described tilt adjusting device.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2A is an exploded perspective view showing a tilt adjustment apparatus of the optical disk drive of the present invention, and FIG. 2B is a sectional view taken along line C-C 'of FIG. 2A.

2A and 2B, the spindle motor 110 is installed and has a motor base 210 having three adjustment holes 231, 232, 233, three elastic bosses 220, and the adjustment holes 231, 232, 233. It is coupled to the elastic boss 220 to combine the main base 130 and the motor base 210 and at the same time to lift the motor base 210 by the elastic force of the elastic boss 220 according to the amount of tightening. Two adjusting screws 230 are provided.

The motor base 210 has two adjustment holes 231 and 232 in the radial direction R and one adjustment hole 233 in the tangential direction T facing the rotation axis 111 of the spindle motor 110. ) Is formed and the adjustment screw 230 is fastened to the elastic boss 220 through the adjustment holes (231, 232, 233).

Herein, the elastic boss 220 is a fixed part 221 fixed to the main base 130 and a female screw part 222 extending in the direction of the motor base from the fixing part 221 to form concentricity with the adjustment holes 231, 232, 233. And an elastic arm formed on the outer circumferential surface of the female screw part 222 and contacting the bottom surface 211 of the motor base 210 to impart an elastic force in a direction in which the motor base 210 is spaced apart from the main base 130. 223). Therefore, when the adjustment screw 230 is fastened to the elastic boss 220 through the adjustment holes 231, 232, 233 of the motor base 210, the motor base 210 is coupled to the main base 130 and at the same time to the elastic arm 223. Receives the elastic force in the direction away from the main base 130 and the mote base 210 is elevated by the elastic force in accordance with the tightening amount of the adjustment screw 230.

To adjust the tilt in the radial direction (R), loosen or tighten the adjustment screw 230 of the adjustment hole indicated by reference numeral 231 or 232 little by little as indicated by reference numeral 251. In FIG. 2A, it rotates in the direction of reference numeral 253. Therefore, the tilt in the radial direction can be adjusted by adjusting the tightening amount of the adjustment screw 230 of the adjustment hole indicated by reference numeral 231 or 232.

Next, adjust the tilt of the tangential direction (T), loosen or tighten the adjustment screw 230 of the adjustment hole indicated by the reference numeral 233 as shown by reference numeral 251 little by little, the motor base 210 is elevated in the direction of the reference numeral 252. In FIG. 2A, it rotates in the direction of reference numeral 254. Therefore, the tilt in the tangential direction can be adjusted by adjusting the tightening amount of the adjustment screw 230 of the adjustment hole indicated by reference numeral 233.

Therefore, when adjusting the tilt while tightening or loosening the three adjusting screws 230 as described above, the motor base 210 is the spindle motor 110 by the elastic force of the elastic arms 223 formed on the three elastic bosses 220. It can be rotated in the direction of reference numerals 253 and 254, and the tilt in the radial and tangential directions can be adjusted.

When the tilt is adjusted as described above, the height of the optical disc 170, that is, the position of the axial direction S of the spindle motor 110 is changed. If the absolute height of the optical disc changes, fatal data damage may occur due to touch with the actuator, etc., and this should be corrected. When the height of the optical disc 170 is increased, if the three adjusting screws 230 are tightened by the same amount, the height of the optical disc 170 may be lowered by lowering the motor base 210 while maintaining the tilted state. When the height of the optical disc 170 is lowered, by loosening the three adjusting screws 230 by the same amount, the height of the optical disc 170 may be increased by raising the motor base 210 while maintaining the tilted state.

Therefore, the tilt can be adjusted without changing the absolute height of the optical disk, and the design of the optical disk drive can be made thinner because it is not necessary to consider the upper and lower heights in consideration of the tilt adjustment height.

In the embodiment shown in Figs. 2A and 2B, there are two adjustment holes in the radial direction and two adjustment holes in the tangential direction. In addition, two adjustment holes in the tangential direction and one adjustment hole in the radial direction are also provided. Further, various embodiments are possible, such as providing three adjustment holes at positions facing each other about the rotation axis of the spindle motor.

3 is a graph in which vibration characteristics are tested while giving a 0.5 G excitation force when the tilt adjustment device of the present invention is adopted. As shown, there was a displacement of about 10 μm before adjusting the tilt, but after adjusting the tilt according to the present invention, the displacement was reduced to about 6.5 μm.

According to the above configuration, the tilt in the radial direction and the tangential direction can be adjusted by using the elastic force of the elastic boss while changing or unfastening the three adjusting screws without changing the absolute height of the optical disk.

As described above, according to the tilt adjustment apparatus of the optical disk drive according to the present invention, the following effects can be obtained.

First, since the absolute height of the optical disk does not change after the tilt adjustment, data is not damaged by contact with the actuator.

Second, since the absolute height of the optical disk does not change, it is not necessary to provide an upper and lower space for tilt adjustment, which is advantageous for the thinner design of the optical disk drive.

It is to be understood that the invention is not limited to that described above and illustrated in the drawings, and that more modifications and variations are possible within the scope of the following claims.

Claims (4)

An optical disc drive tilt control apparatus for adjusting the tilt of the optical disc and the actuator in an optical disc drive that records or reads information while sliding a pickup base mounted with an actuator in a radial direction of an optical disc rotated by a spindle motor. A motor base in which the spindle motor is installed and having three adjustment holes; Three elastic coupling means installed on the main base and coupled to the motor base to impart an elastic force in a direction away from the main base; And three adjusting screws for coupling the main base and the motor base by the fastening hole and the elevating force of the motor base by the elastic force of the elastic coupling means according to the tightening amount. Tilt adjuster for optical disc drives. The method of claim 1, The elastic coupling means, the fixed portion fixed to the main base; A female screw part extending in the direction of the motor base from the fixing part and concentric with the adjusting hole; And And an elastic arm which is formed on an outer circumferential surface of the female screw portion and contacts the bottom surface of the motor base to impart an elastic force in a direction in which the motor base is spaced apart from the main base. In the optical disk drive comprising a tilt adjusting device for adjusting the tilt of the optical disk and the actuator, the tilt adjusting device, A motor base in which the spindle motor is installed and having three adjustment holes; Three elastic coupling means installed on the main base and coupled to the motor base to impart an elastic force in a direction away from the main base; And three adjusting screws for coupling the main base and the motor base by the fastening hole and the elevating force of the motor base by the elastic force of the elastic coupling means according to the tightening amount. Optical disk drive, characterized in that. The method of claim 3, The elastic coupling means, the fixed portion fixed to the main base; A female screw part extending in the direction of the motor base from the fixing part and concentric with the adjusting hole; And And an elastic arm formed on an outer circumferential surface of the female screw part and contacting a bottom surface of the motor base to impart an elastic force in a direction in which the motor base is spaced apart from the main base.