KR100585671B1 - Automatic tilt control device in optical disk drive - Google Patents

Abstract

The present invention relates to an automatic tilt correction device for an optical disc drive, comprising: a deck base on which a spindle motor is installed, a tilt base installed at a predetermined distance from the deck base, and the tilt base to be rotatable with respect to the deck base. A hinge portion connecting the deck base and the tilt base, a pickup mechanism installed on the tilt base to play the optical disc and record information, and an optical sensor to check the level of the pickup mechanism on an upper surface of the pickup mechanism; And a rotation drive mechanism provided on the deck base to push up and down one end of the tilt base to rotate the tilt base about the hinge portion, thereby adjusting the deformation direction and the degree of deformation of the rotating disk during the operation of the optical disc drive. The optical sensor detects the level and the image on the optical disc A tilt correction apparatus for an optical disc drive that can automatically reduce the error of recording and reproducing information by automatically correcting the horizontality of the existing pickup mechanism.

Hinge protrusion, hinge base, tilt cam, deck base, tilt base

Description

Automatic tilt correction device for optical disc drives {AUTOMATIC TILT CONTROL DEVICE IN OPTICAL DISK DRIVE}

1 and 2 are related to a conventional optical disk drive,

1 is a plan view

Figure 2 is an exploded perspective view of the portion A of Figure 1, Figure 2 (a) is a plan view, Figure 2 (b) is a side view

3 to 7 are related to an optical disk drive having a tilt correction device according to an embodiment of the present invention,

3 is a plan view

4 is a side cross-sectional view taken along the line IV-IV of FIG.

5 is an enlarged cross-sectional view of the portion B of FIG.

6 is an enlarged cross-sectional view of the portion C of FIG.

FIG. 7 is a side schematic view illustrating the operating principle of the rotary cam of FIG.

** Description of symbols for the main parts of the drawing **

110: deck portion 111: deck base

114: hinge base 120: pickup mechanism

121: pickup unit 126: support spring

130: tilt adjustment unit 131: tilt base

132: hinge protrusion 139: tilt cam

The present invention relates to a tilt correction apparatus for an optical disk drive, and more particularly, to a tilt correction apparatus for an optical disk drive that automatically corrects an inclination of the pickup mechanism with respect to the optical disk.

An optical disc drive, which is an optical recording and reproducing apparatus, is an apparatus for recording / reproducing predetermined information on an optical disc by using optical means such as a pickup unit. The optical disc on which information is recorded / reproduced by the optical recording and reproducing apparatus is mounted on the turntable of the spindle motor by the optical disc loading apparatus and rotates at a predetermined speed. While the optical disc is rotating, the pick-up unit moves in the radial direction of the optical disc to irradiate a laser beam to the optical disc to read an optical signal or to record information.

At this time, the laser beam irradiated from the pickup unit, i.e., the optical axis, should be formed perpendicular to the surface of the optical disc, and the pickup unit should move while maintaining a constant level with respect to the recording surface of the optical disc at all times. If the optical disc is not bent by a predetermined amount or the laser beam irradiated from the pickup unit due to the assembly error of the transfer unit of the pickup unit is not formed perpendicular to the optical disc surface, it becomes difficult to record / reproduce information on the optical disc. In particular, DVDs or BDs, which are widely used in recent years, have a smaller recording pit than general compact disks (CDs), and therefore act very sensitive to horizontality.

Therefore, when the optical axis from the pickup unit of the optical recording / reproducing apparatus is not formed perpendicular to the optical disc, the tilt correction device which operates to adjust the horizontality of the pickup unit with respect to the optical disc by adjusting the up and down positions of the pickup unit It is provided in the recording / reproducing apparatus.

1 and 2 are related to an optical disk drive equipped with a conventional tilt correction device 1, as shown in the conventional tilt correction device, a pickup unit is supported by a pair of guide shafts 25, It is installed on the tilt base, and is configured to adjust the level of the pick-up unit with respect to the optical disc by adjusting the tilt angle by manually raising and lowering one end of the guide shaft 25.

In detail, the conventional optical disc drive includes a deck unit 10 in which a spindle motor 12 for mounting and driving an optical disc 2 is installed, and a pickup mechanism 20 for recording and reproducing information of the optical disc 2. And a tilt correction unit 30 for adjusting the horizontality of the pickup mechanism 20 and a tilt correction unit 30.

Here, the deck part 10 includes a deck base 11 serving as a base on which a plurality of pickup drive mechanisms are mounted, a spindle motor 12 fixed to an upper surface of the deck base 11, and a spindle motor 12. It is provided with a turntable 13 formed to mount the optical disk 2 on the upper surface.

The pick-up mechanism 20 is connected to the pick-up unit 21 for irradiating a laser beam to the optical disc 2, the feed motor 22 for driving the pick-up unit 21 and the feed motor 22 to rotate. A lead screw 23, a connecting portion 24 for connecting the pick-up unit 21 and the lead screw 23 with gears, and a pair of guide shafts 25 for guiding the pick-up unit 21 to be conveyed in the front-rear direction. And a support spring 26 for fixing the both ends of the guide shaft 25 to allow a predetermined movement in the vertical direction.

The tilt correction unit 30 has a spiral adjustment rod 31 installed in the through hole 11a formed through the deck base 11 and supports the guide shaft 25 in its own spiral structure, and is attached to the deck base 11. An adjustment rod guide 32 is fixed to fix the spiral adjustment rod 31 in a planar manner.

Here, the groove 31a is formed in the tip end surface of the spiral adjustment rod 31 so that the spiral adjustment rod 31 can be rotated by a (-) screwdriver.

The method of adjusting the horizontality of the pickup unit 21 of the conventional optical disc drive 1 configured as described above is as follows. That is, after assembling the deck portion 10, the pick-up mechanism 20, and the like, in order to adjust the horizontality between the optical disc 2 and the pickup unit 21, the spiral adjusting rod 31 is manually operated with a (-) screwdriver. When rotating in the direction of rotation, the guide shaft 25 fixed by the spiral adjusting rod 31 and the support spring 26 is moved up and down by the spiral of the spiral adjusting rod 31 to adjust the horizontality of the pickup unit 21. It becomes possible.

However, the tilt correction apparatus of the above-described optical disc drive uses only any standard disc when assembling the optical disc drive, and adjusts only the horizontality of the pickup unit 21 with respect to this. In other words, it is impossible to adjust the horizontality of the pickup unit 21 with respect to the optical disk 2 that is actually inserted and rotated in the operation of the optical disk drive. Therefore, in the case where the optical disc 2 to be deformed in the up and down directions with respect to the radial direction due to manufacturing error or inadvertent use is to be reproduced or recorded, the gap between the optical disc 2 and the pickup unit 21 is far. There has been a problem that an error occurs in recording or reproducing information due to the loss or proximity.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art, and provides an automatic tilt correction device for an optical disc drive that can significantly reduce recording and reproducing errors of information by automatically correcting the inclination of the pickup mechanism. The purpose.

The present invention provides an optical disc drive for recording and reproducing an optical disc, in order to achieve the above object, comprising: a deck base; A tilt base installed at a predetermined distance from the deck base; A hinge portion connecting the deck base and the tilt base such that the tilt base is rotatable with respect to the deck base; A pickup mechanism provided in the tilt base to play the optical disc and record information; An optical sensor for checking the horizontality of the pickup mechanism on an upper surface of the pickup mechanism; A rotation drive mechanism installed on the deck base to push up and down one end of the tilt base to rotate the tilt base about the hinge portion; It provides a tilt correction apparatus for an optical disc drive, characterized in that configured to include.

This is to check the level of the pick-up mechanism with respect to the optical disk with an optical sensor and to automatically adjust the level of the pick-up mechanism by rotating the tilt base about the hinge portion with the rotary drive mechanism.

Here, the rotation drive mechanism may also be mounted on the deck base, but may be mounted on the tilt base to obtain the same effect.

And, the hinge portion is provided on both sides in the width direction of the tilt base, respectively, the hinge projection formed on the bottom surface of the tilt base; It is composed of a hinge base having a receiving groove formed in the recess to receive the hinge projection. On the other hand, the hinge portion may be composed of a hinge base formed on the bottom surface of the tilt base and a hinge protrusion formed on the upper surface of the deck base to be inserted into the receiving groove formed in the hinge base.

The hinge portion may include a guide pin fixed to the deck base by penetrating the tilt base; A pressure spring installed by compressing a predetermined amount between one end of the guide pin and the tilt base; It is further configured to be effective in view of the separation of the tilt base and ease of assembly.

In addition, preferably configured to further include a position fixing spring for connecting between the deck base and the tilt base.

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

3 to 7 are views of an optical disk drive having a tilt correction device according to an embodiment of the present invention. FIG. 3 is a plan view, FIG. 4 is a side cross-sectional view along the cutting line IV-IV of FIG. 3 is an enlarged cross-sectional view of portion B of FIG. 3, FIG. 6 is an enlarged cross-sectional view of portion C of FIG. 3, and FIG. 7 is a side schematic view showing the operating principle of the rotary cam of FIG.

As shown in the figure, the optical disc drive having a tilt correction device 100 according to an embodiment of the present invention, the deck unit 110 is installed with a spindle motor 112 for mounting and driving the optical disc 101 A pickup mechanism 120 for reproducing and recording information on the optical disc 101, a tilt correction unit 130 for adjusting the horizontality of the pickup mechanism 120, a deck unit 110, and a tilt correction unit 130; It is configured to include a position fixing spring 140 for fixing the position between the () while allowing a predetermined fluctuation range.

The deck part 110 serves as a base on which all the functional parts are mounted, the deck base 111 having the through part 111a formed therein, and the spindle motor 112 fixed to the upper surface of the deck base 111. On the upper surface of the deck base 111, the turntable 113 formed to seat the optical disk 101 on the upper surface of the spindle motor 112, and the tilt base 131 in contact with the tilt base 131 to be the rotation center of the tilt base 131. The formed hinge base 114 and the set screw 115 provided while allowing the deck base 111 to move left and right to pull the tilt base 131 are provided.

The pickup mechanism 120 includes a pickup unit 121 for irradiating a laser beam to the optical disc 101, a transfer motor 122 driven to transfer the pickup unit 121, and fixed to the tilt base 131, and a transfer unit. A lead screw 123 connected to the motor 122 to rotate, a connecting portion 124 connecting the pick-up unit 121 and the lead screw 123 with gears, and guide the pick-up unit 121 to be transported in the front-rear direction. A pair of guide shafts 125 fixed at both ends to the tilt base 131, support springs 126 for fixing both ends of the guide shaft 125 to the tilt base 131, and a pickup unit 121 of And an optical sensor 127 attached to the upper surface of the pickup unit 121 to check the horizontality.

Here, the pickup mechanism 120 is mounted on the tilt base 131 to have a predetermined height. In order to prevent the thickness of the entire structure from being thickened by the height of the pick-up mechanism 120, a penetrating portion 111a is formed at the center of the deck base 111, and the pick-up unit 121 and the transfer motor 122 are By assembling so as to overlap with the through portion 111a, it is possible to prevent the entire thickness from becoming thick.

The tilt correction unit 130 is a bottom surface of the tilt base 131 to be inserted into the tilt base 131, which is a substrate on which the pick-up mechanism 120 is mounted, and the receiving groove 114a formed in the hinge base 114. Hinge protrusion 132 protruding in the deck base, the tilt base 131 on one side of the hinge protrusion 132 through the tilt base 131 acting as a guide to apply a predetermined force to the deck base 111 deck base Press pin 133 fixed to the 111, the washer 134 inserted into the head of the guide pin 133, and the pressure installed with a predetermined amount of compression between the washer 134 and the tilt base 131 A tilt motor 136 for generating a driving force for rotating the spring 135, the tilt base 111 about the hinge protrusion 132, and a motor part gear 137 rotating in conjunction with the tilt motor 136; , The tilt gear 138 meshing with the motor gear 137 and the central gear of the tilt gear 138 are formed to protrude according to rotation. The front end surface is provided with a tilt cam 139 which has the inclined surface when looking at the side so that the height is changed, and the bottom surface of one side 131a of the tilt base 131.

Here, the hinge protrusion 132 is inserted into the receiving groove 114a of the hinge base 114 to rotate by a predetermined angle. At this time, in order to prevent the tilt base 131 from being separated from the deck base 111, in addition to the positioning spring 140, the pressing spring 135 pushes the tilt base 131 toward the deck base 111. It is configured to exert a force.

The position fixing spring 140 moves along the guide shaft 125 for accurate observation of a tracking error when the laser light emitted from the pickup unit 121 passes through the pit track where the information of the optical disc is stored. It is formed to connect between the deck base 111 and the tilt base 131 to align the optical axis center and the optical disk center of the 121 in the same line in the radial direction of the optical disk, a set screw installed on the deck base 111 side ( 115) to adjust the appropriate amount.

 Hereinafter, the operating principle of one embodiment of the present invention will be described in detail.

When the optical disk 101 is loaded in the optical disk drive, the optical unit 127 mounted on the upper surface of the pickup unit 121 before the information of the optical disk 101 is read out of the pickup unit 121 and the optical disk 101. Check the horizontality of the bottom. As a result of checking the horizontal degree, if the difference between the horizontality of the pickup unit 121 and the optical disc 101 exceeds a predetermined value, the tilt motor 136 is driven to rotate the motor unit gear integrally with the tilt motor 136. Rotate tilt gear 138 which meshes with 137. As the tilt gear 138 is rotated, the height of the tilt cam 139 formed on the tilt gear 138 is changed, and the tilt cam 139 moves one side 131a of the tilt base 131 up and down, Accordingly, the tilt base 131 is finely rotated about the hinge protrusion 132 which is the rotation center, and the height of one end of the guide shaft 125 is adjusted according to the rotation of the tilt base 131 to guide the shaft 125. The degree of inclination of the pickup unit 121 can be adjusted to the horizontal level. Then, the pickup unit 121 is moved by the feed motor 122 along the pair of guide shafts 125, whereby a normal recording / reproducing process of the optical disc is performed.

On the other hand, the operation of aligning the center of the optical axis of the pickup unit 121 and the center of the optical disc 101 on the same line in the radial direction is performed to accurately observe the tracking error with the laser beam emitted from the pickup unit 121. This is done only once during assembly and no deformation occurs, so the deck system does not need to be reworked when the disc is played.

As described above, while the optical disc drive is operating, the degree of deformation of the optical disc 101 can be detected, and information can be recorded or reproduced while automatically adjusting the horizontality of the pickup unit 121 in response to the deformation of the optical disc 101. Will be. Therefore, the amount of tilt between the pickup unit 121 and the optical disc 101 in the process of recording or reproducing the modified optical disc 101 into the optical disc drive having the automatic tilt correction device according to the embodiment of the present invention. Since the information is recorded or reproduced while correcting the error, an error generated during recording or reproduction of the information due to the deformation of the optical disc 101 can be significantly reduced.

In addition, the present invention in the process of assembling the tilt base 131 and the deck base 111, the receiving projection 114a of the hinge base 114 of the deck base 111 to the hinge protrusion 132 of the tilt base 131 It is placed directly on the), and has a structure that fastens the guide pin 133 of the spring method, it has the advantage of excellent assembly.

Although the preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to these specific embodiments, and may be appropriately changed within the scope described in the claims.

As described above, according to the present invention, the deck base and the deck base is installed, the tilt base is provided spaced apart from the deck base a predetermined distance, the deck base and the so that the tilt base is rotatable relative to the deck base A hinge portion connecting the tilt base, a pick-up mechanism installed on the tilt base to reproduce the optical disc and record information, an optical sensor for checking the level of the pick-up mechanism on the upper surface of the pick-up mechanism, and the tilt base A rotary drive mechanism mounted on the deck base such that the tilt base is rotated about the hinge portion by pushing one end up and down, so that the deformation direction and the degree of deformation of the rotating disk during the operation of the optical disc drive are horizontally measured by an optical sensor. Detects the degree of leveling of the pick-up mechanism relative to the optical disc. It provides an automatic tilt compensator of an optical disc drive that can significantly reduce the error in the recording and reproducing information by correcting the same.

In addition, in the process of assembling the tilt base and the deck base, the present invention has a structure in which the hinge protrusion of the tilt base is directly raised to the receiving groove of the hinge base of the deck base and fastens the guide pin of the spring method. It also has the advantages of excellent assembly.

Claims (10)

An optical disc drive for recording and playing an optical disc, Deck base; A tilt base installed at a predetermined distance from the deck base; A hinge portion connecting the deck base and the tilt base such that the tilt base is rotatable with respect to the deck base; A pickup mechanism provided in the tilt base to play the optical disc and record information; An optical sensor for checking the horizontality of the pickup mechanism on an upper surface of the pickup mechanism; A rotation drive mechanism installed on the deck base to push up and down one end of the tilt base to rotate the tilt base about the hinge portion; It includes, the hinge portion, A hinge protrusion formed on a bottom of the tilt base; A hinge base formed on an upper surface of the deck base and having an accommodation groove formed to accommodate the hinge protrusion; Tilt correction device of an optical disk drive, characterized in that configured to include. An optical disc drive for recording and playing an optical disc, Deck base; A tilt base installed at a predetermined distance from the deck base; A hinge portion connecting the deck base and the tilt base such that the tilt base is rotatable with respect to the deck base; A pickup mechanism provided in the tilt base to play the optical disc and record information; An optical sensor for checking the horizontality of the pickup mechanism on an upper surface of the pickup mechanism; A rotation drive mechanism installed on the tilt base such that the tilt base is rotated about the hinge portion by moving one end of the tilt base up and down by contacting and pushing the deck base;  It includes, the hinge portion, A hinge protrusion formed on a bottom of the tilt base; A hinge base formed on an upper surface of the deck base and having an accommodation groove formed to accommodate the hinge protrusion; Tilt correction device of an optical disk drive, characterized in that configured to include. An optical disc drive for recording and playing an optical disc, Deck base; A tilt base installed at a predetermined distance from the deck base; A hinge portion connecting the deck base and the tilt base such that the tilt base is rotatable with respect to the deck base; A pickup mechanism provided in the tilt base to play the optical disc and record information; An optical sensor for checking the horizontality of the pickup mechanism on an upper surface of the pickup mechanism; A rotation drive mechanism installed on the deck base to push up and down one end of the tilt base to rotate the tilt base about the hinge portion; It includes, the hinge portion, A hinge protrusion formed on an upper surface of the deck base; A hinge base having a recess formed in the recess to accommodate the hinge protrusion and formed on a bottom surface of the tilt base; Tilt correction device of an optical disk drive, characterized in that configured to include. An optical disc drive for recording and playing an optical disc, Deck base; A tilt base installed at a predetermined distance from the deck base; A hinge portion connecting the deck base and the tilt base such that the tilt base is rotatable with respect to the deck base; A pickup mechanism provided in the tilt base to play the optical disc and record information; An optical sensor for checking the horizontality of the pickup mechanism on an upper surface of the pickup mechanism; A rotation drive mechanism installed on the tilt base such that the tilt base is rotated about the hinge portion by moving one end of the tilt base up and down by contacting and pushing the deck base; It includes, the hinge portion, A hinge protrusion formed on an upper surface of the deck base; A hinge base having a recess formed in the recess to accommodate the hinge protrusion and formed on a bottom surface of the tilt base; Tilt correction device of an optical disk drive, characterized in that configured to include. The method according to claim 1 or 2, The hinge portion, A guide pin penetrating the tilt base and fixed to the deck base; A pressure spring installed between one end of the guide pin and the tilt base; Tilt correction apparatus of an optical disk drive, characterized in that further comprises. The method according to claim 3 or 4, The hinge portion A guide pin penetrating the tilt base and fixed to the deck base and having a head portion at the tilt base side; A pressure spring installed by compressing a predetermined amount between the head of the guide pin and the tilt base; Tilt correction apparatus of an optical disk drive, characterized in that further comprises. The method according to any one of claims 1 to 4, The rotation drive mechanism, A tilt motor installed at the deck base; A tilt cam formed to rotate in conjunction with the tilt motor and vary in height according to rotation; And the tilt cam is installed to be in contact with one surface of the tilt base such that the tilt base rotates about the hinge portion in accordance with the rotation of the tilt cam. The method according to any one of claims 1 to 4, The rotation drive mechanism, A tilt motor installed at the tilt base; A tilt cam formed to rotate in conjunction with the tilt motor and vary in height according to rotation; And the tilt cam is installed to be in contact with one surface of the deck base such that the tilt base rotates about the hinge portion in accordance with the rotation of the tilt cam. The method according to any one of claims 1 to 4, And a position fixing spring for connecting between the deck base and the tilt base. The method according to any one of claims 1 to 4, The deck base is provided with a through portion penetrating the central portion, And the deck base and the tilt base are arranged such that the pick-up mechanism seated on the bottom of the tilt base is positioned at the through portion.

Images