JPH06195736A - Optical-disk player - Google Patents

Abstract

PURPOSE: To remove a backlash between a pinion and a rack for moving a carriage by easily adjusting an off-axis and a tangential skew and tilting or lifting a turn table by means of loading. CONSTITUTION: The guide shaft 110 of the carriage 105 is fixed to a position adjusting plate 112 and the position adjusting plate 112 is fixed to a fixing plate 100 by an adjusting screw 116 so as to be horizontally moved in a carriage 105 moving direction and in a perpendicular direction. The adjusting screw 116 and a cam mold for vertically moving one side of the pickup base of a pick-up means against the carriage 105 are provided to the carriage 105. A motor base for fitting the turn table 1 is movably arranged in the fixed plate 100 and a cam follower sliding on the fixed plate along a cam plate is attached to the motor base. A correcting gear and a spring for removing the backlash between the pinion and the rack are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk player used to reproduce signals recorded on an optical disk, and more particularly to off-axis and tangential skew (ta) of a pickup means due to processing and assembly tolerances.
ngential skew) can be easily adjusted, and the tilting and lifting due to the slack or distortion of the disc can be facilitated so that the distance and angle between the pickup means and the disc can be kept constant, and for the carriage movement. The backlash between the pinion and the rack member can be removed to make the search quick and accurate,
The present invention relates to an optical disc player capable of obtaining clear images, mass productivity and reliability.

[0002]

2. Description of the Related Art A conventional typical double-sided optical disk player is Japanese Patent Laid-Open Publication No. 2-66779 (published March 6, 1990, patent application number 63-21).
6683). The optical disc player disclosed herein includes a spindle motor (2) for driving an optical disc (10) mounted on a turntable (1) at a constant speed as shown in FIGS.
It moves along the pair of guide shafts (3) and (4) to reproduce the signal recorded on the optical disc, and the pickup means (6)
It has a carriage (5) on which are loaded and turning means (7) for rotating the carriage so that both sides of the disk recording surface can be reproduced. In addition to the pick-up means (6) for reproducing the signal recorded on the optical disk, the carriage (5) has a sliding motor (5
3), tilt angle correction motor (54) and altitude adjustment motor (55)
And various parts for driving the three motors to transmit power.

That is, as shown in FIG. 3, the carriage
The carriage (5) is provided with a horizontal movement gear (51) and a turning gear (52) for transmitting the power of the sliding motor (53) during the horizontal movement and turning of (5).

The inclination angle correcting motor (54) corrects the inclination degree of the pickup means (6) due to the looseness of the disk end portion, so that the pickup means (6) fixed to the first case (61) is used for the case. The pins (62) and (63) protruding at both ends are used as hinge points so that the left and right inclination angles can be maintained. Also, the altitude adjustment motor (55)
When (5) turns between both sides of the disc, it prevents one side of the edge from hitting the edge of the disc that is loose, and when the inclination angle at the disc end side is large, the inclination angle correction motor ( The height, which has not been sufficiently compensated via 54), is additionally compensated, so that the height of the pickup means 6 can be adjusted via the first moving member 64.

The carriage (5) thus constructed is
The horizontal movement gear (51) driven by the power of the sliding motor (53) and the rack member (31) (41) formed along the pair of guide members (3) and (4) are driven to mesh with each other by a disc ( The signal recorded on the disk surface is read while moving at a constant speed from the inner edge to the outer edge of 10).

At this time, the carriage (5), which makes accurate horizontal movement along the pair of upper and lower guide members (3) and (4), first reproduces the bottom surface of the optical disk (10), and then reproduces the top surface. For turning. Since the turning motor (53) is simultaneously rotating in the sliding motor (53) equipped with the horizontally moving gear (51), the turning gear (52) is moved along the inner surface of the circular fixed gear (8). The carriage (5) automatically twists while the () moves in mesh with each other.

The turning operation of the carriage (5) will be explained. After reproducing the signal recorded on the lower surface of the disk (10) while moving along the lower guide member (4), the carriage (5) is Turning gear that is disengaged from the lower guide member (4) and then rotated by the sliding motor (53) while being coupled to the turning guide member (9) that is connected to the circular inner fixed gear (8). The turning operation is performed by the (52) meshing with the inner fixed gear (8) to make a planetary motion. However, in such a conventional optical disc player, when the carriage (5) along with the pick-up device moves a constant speed from the inner peripheral edge to the outer peripheral edge of the disc while reading the signal recorded on the surface of the disc, the pick-up means runs. While maintaining a right angle between the optical axis and the running area of the disk surface, the extension line of the optical axis movement track intersects the center of rotation of the disk to maintain the highest screen state. However, the conventional optical disc player has the following problems.

First, due to the tolerances involved in processing and assembly, the extension line of the movement path of the optical axis of the pickup means, the center of rotation of the disk, the radiating optical axis of the pickup means and the rotation axis of the disk, that is, the rotation axis of the spindle cannot match. . In this case, off-axis and tangential shew are said to have occurred.

That is, in order to reproduce a good image, FIG.
As shown in Fig. (A) of Fig. 1, when the disk (10) is mounted on the turntable (1) mounted on the spindle motor (2) and then rotated, the center of the rotating disk (10) and The extension lines of the movement loci of the pick-up means (106) on the carriage (105) moving horizontally by receiving the guides of the pair of left and right guide members (101), (102) must intersect.

This state is called off-axis "0".
However, when the movement locus of the pickup means (106) does not intersect the central axis of the spindle motor (2) and is inclined at a constant angle (θ) as shown in FIG. 4B due to machining and assembly tolerances. Says that off-axis has occurred, and
Appears as the off-axis amount Δ. In addition, FIG.
Even when the off-axis amount is 0, the central axis of the spindle motor does not coincide with the traveling optical axis of the pickup means,
The inclination angle (α) is generated, but at this time, the tangential skew is said to have occurred. The mode of occurrence of such off-axis and tangential skew is as shown in FIGS. 5 (A) and 5 (B).

When such a phenomenon occurs, the position of the pickup means (106) must be corrected in order to reproduce a fine image. However, such off-axis (Δ)
5 (A), the central axis of the pickup means (106) having an off-axis (Δ) is tangentially parallel to the central axis of the spindle motor (2) in order to remove the tangential skew (α). After correcting the skew (α), as shown in FIG. 5B, a series of processes for removing the off-axis (Δ) by adjusting the guide axis so that the movement locus of the pickup means (106) coincides with the center of the disc. Have to go through.

Therefore, in the process of processing the parts and assembling the optical disc player, the work of removing the off-axis and the tangential skew generated together with the high-level tolerance management must use a separate correction device, To remove the axis (Δ), the guide shaft tightening screw must be adjusted downward, and the compensator and the screw tightening tool must be used together on the side of the pickup means for adjusting the tilt angle. There were problems such as. Further, when off-axis and tangential skew occur during use, it is not so easy.

Secondly, according to the standard, the disc (10) placed on the turntable (1) allows a change of +0.9, -1.2 mm at the disc end in a rotating state. In the stopped state, +1.5 and -2.5 mm are recognized as allowable errors. Therefore, even if the disc (10) may be loosened, the traveling optical axis of the pickup means (6) is always It must be able to maintain a right angle with the running part of the disc at a certain distance.

As can be seen from FIG. 6, the carriage (5) on which the pickup means (6) is mounted has a guide member.
(3) It is fixed to (4), but the pick-up means (6) itself must be able to tilt with respect to the carriage (5) by the tilt angle correction motor (54), and in case there is a considerable amount of slack. The height adjustment motor (55) can be used to adjust the height of the pickup means.

That is, the "A" state in FIG. 6 is the disk (10).
Set the bottom surface (10a) of the
(6) is neutral and can be played back without adjusting the tilt angle and height, but the carriage (5) is gradually moved to the outside of the disc from this state, and the "B" position is set. Then, the pickup means (6) fixed to the carriage (5) by the hinge pins (62) and (63) tilts the pickup means (6) at an inclination corresponding to the slack angle of the disc (10) without adjusting the height. The exact focus is detected and played back.

At this time, the pickup means (6) is
The movement of 1.7 mm also serves as fine adjustment. Then, when the "C" position is reached, the hinge pins (62) and (63) are moved to the hinge groove () of the carriage (5) in order to maintain a constant distance between the pickup means (6) and the disk (10). As the height is adjusted to descend along 62) and the tilt angle is corrected, it becomes possible to prevent the signal reproduction from being affected, and after the reproduction of the disc lower surface (10a) through such a process, Use the altitude adjustment motor (55) so that the pickup means (6) does not come into contact with the end of the disc when turning when the "D" for turning is reached above the disc upper face (10b) for playback. So that it is fully inserted in the carriage (5).

In Korean Patent Application No. 91-24277, which was invented by the present applicant, a tilt angle correction motor is provided, and the tilt angle correction and height adjustment of the pickup means are simultaneously performed by receiving the power of the tilt angle correction motor. A cam gear having a cam curve on its upper surface to be controlled, and a pickup base having the above-mentioned pickup means are mounted, hinge-coupled to the end of the carriage, and a lift guide for correcting height and inclination angle along the cam curve. It is configured to perform tilting. Further, in Korean Patent Application No. 92-7994 by the applicant, a carriage is driven by a cam member using a turning motor.
It is configured so that the vertical tilt angle can be adjusted outside of (5).

However, in such a conventional pickup driving device, various driving (5c) (5d) (5e) are mounted on the carriage (5).
It is provided in a combined form inside, and because of its structural assembly form or very complicated structure, it increases the weight of the carriage itself and acts as a major obstacle to delay the moving speed and the search time. Not only that, but a serious problem has been pointed out that the reliability of the operation is greatly reduced due to the complexity of the motor drive system.

Further, in the above-mentioned conventional structure, a sliding motor, a tilt correction motor and an altitude adjustment motor are mounted in the carriage, so that when the turning operation is performed,
Not only a large load is applied to the motor, but this also consumes a large amount of current, which complicates the tilting mechanism inside the carriage, reducing the reliability of the product and making the overall weight feeling large. Since it is large, it is difficult to control during the installation operation, and since the structure is complicated, the maintenance cost is high due to the high failure rate and so on.

Thirdly, since the conventional optical disc player is not equipped with a backlash removing device, the external shock may make the playing uneasy, or the structure is complicated even if it is provided. There was a problem.

That is, if the conventional backlash removing device is not provided, when the play between gear teeth is large or there are many connections between gears, the carriage may sway even with a small impact during reproduction. Therefore, the reproduction position of the pickup means becomes uncertain, and there is a defect that it takes more time to correct the amount of backlash, especially when the carriage passes through a desired point due to inertial force during search.

The product provided with the conventional backlash removing device has a defect that the productivity is lowered because the number of used parts is large and the structure is complicated.

[0023]

SUMMARY OF THE INVENTION The present invention has been devised in order to solve the above-mentioned problems of the prior art. The off-axis and tangential skew of the pickup means can be easily adjusted, and the slack of the disk or Tilting and lifting due to distortion can be facilitated, the backlash between the pinion and the rack member for moving the carriage can be removed, and the search can be performed quickly and accurately, with clear images and mass productivity and reliability. It is an object of the present invention to provide a single-sided or double-sided optical disk player capable of achieving high performance.

[0024]

SUMMARY OF THE INVENTION To achieve the above object, an off-axis adjusting device of a pickup means of the present invention is a carriage having a pinion and a guide groove for loading and moving the pickup means; and a pinion of the carriage. At least one fixing plate on which one or more rack members for interacting with and moving the carriage are fixed; and a guide shaft on which a guide groove of the carriage is guided is fixed, and at least one fixing The upper and lower surfaces of the plate include one or more position adjusting plates fixed horizontally movable with respect to the fixed plate so that the off-axis of the pickup means can be removed.

The one or more fixed plates and the position adjusting plate are each provided with a flange so that the horizontal movement of the position adjusting plate with respect to the one or more fixing plates is performed laterally, and an adjusting screw is provided between the flanges. Is installed.

Further, in the tangential skew adjusting device of the pickup means according to the present invention for achieving the above-mentioned object, a circular hole into which one shaft of the pickup base is inserted and the other shaft of the pickup base are provided. A U-shaped support groove that is vertically movably inserted, a female-threaded through groove that extends forward of the support groove in a direction perpendicular to the support groove, and a pinion for loading and moving the pickup module A carriage; a cam mold and an adjusting screw installed in a through groove of the carriage to move the other shaft of the pickup base up and down into a U-shaped supporting groove of the carriage by a cam motion by rotation of a screw; Elastic force is applied to the other shaft of the pickup base at the upper opening of the U-shaped support groove of the carriage. Including the upper plate spring.

A side leaf spring may be further provided on the outer surface of the U-shaped support groove of the carriage to apply an elastic force to the other shaft of the pickup base.

In order to adjust the tangential skew of the other surface of the optical disk with respect to the disk rotation axis of the pickup means at the reproducing position, one end of the carriage is hinged to one of the pinion shafts. A roller plate that plays a role of a leaf spring in which the guide roller at the reproduction position on the other surface is pivotally attached to the other end, and a roller plate that allows adjustment of the position of the guide roller with respect to the pickup carriage. Means for angularly displacing the end about the one pinion shaft may be further provided.

A flange for forming the angular displacement is formed on the carriage, an adjusting screw is screwed to the flange, and a roller plate for adjusting the angular displacement by receiving the rotational force of the adjusting screw. It has a flange formed at the other end.

The tilting and lifting device of the pick-up means according to the present invention for facilitating the tilting and lifting due to the slack or distortion of the disk is equipped with a loading gear driven by a loading motor and has a pair of U-shapes. A lower fixing plate on which a rack is installed; a motor base that is freely installed on one side of the U-shaped rack of the lower fixing plate, a spindle motor attached to the motor base, and a turntable pivotally attached to the spindle motor. Disc turning means including: a tilting means for tilting the disc turning means by the loading motor; a disc mounted on a turntable that is moved along a U-shaped rack axially mounted on the lower fixing plate. Recording a carriage equipped with pick-up means for reading the; including lifting means for raising and lowering the installed pickup means to said carriage.

The tilting means has a cam plate having a side surface of a rack gear which has a cam cross section formed on the upper surface and meshes with a loading gear, and a guide means which guides the sliding operation when the rack gear meshes with the loading gear. The cam follower is installed at one end of the motor base so as to incline the disc turning means by sliding on the cam cross section.

The lifting means has a pair of lifting slots formed on both the left and right sides of the carriage and extending upwards and downwards; guide slots formed so as to be inclined with the lifting slots and driven by a lifting motor. A guide bracket having a pin that is bound to a guide groove of a lifting gear and that allows the guide bracket to slide horizontally by the rotation of a lifting motor; and a horizontal sliding operation of the guide bracket, and a vertical lifting operation of a pickup means. A guide pin is fixed to the pick-up means and is coupled to the lifting slot and the guide slot for the purpose of converting to.

The tilting means may incline the carriage, and the lifting means may raise and lower the turntable immediately after the disc turning means.

According to the present invention, a backlash removing device for removing backlash between a pinion gear and a rack gear is provided for an optical disk player having a pinion gear and a rack gear for transmitting power for moving and turning the pickup carriage. The same type as the one gear that is installed in parallel with any one of the pinion gear and the rack gear and is meshed with the other one of the pinion gear and the rack gear. Compensating gear; and spring means for applying an elastic force to the compensating gear to eliminate backlash between the pinion gear and the rack gear.

The correction gear is a pinion gear installed in parallel on the same axis as the pinion gear via a felt, and the spring means is provided for the power transmission pinion to the correction pinion gear. The correction gear may be a conical spring that applies an elastic force to the rack gear, and the correction gear is a rack gear installed in parallel with the rack gear in the movement section of the pickup carriage, and the spring means functions as the correction rack gear. It may be configured by a leaf spring that applies an elastic force to the power transmission pinion gear side so as to slightly project from the power transmission rack gear.

[0036]

With the above-described structure, the fixing screw is once released and the adjusting screw is rotated on the side surface to move the position adjusting plate and the guide shaft fixed to the position adjusting plate horizontally, so that the movement locus of the pickup means is changed. It can be moved in parallel to adjust the off-axis.

The adjustment of the lower tangential skew is performed by rotating the tangential skew adjusting screw on the front side so that the cam mold is moved forward and backward and the right side shaft is slightly moved vertically up and down. The adjustment of the upper tangential skew becomes to adjust the upper tangential skew adjusting screw on the upper part, but since the adjusting screw is tightened on the flange of the carriage,
By tightening or loosening the adjusting screw, the flange of the roller plate is pushed or returned, but the force causes the roller plate to rotate a little about the pinion shaft, and the position of the guide roller is adjusted. The tangential skew of the carriage itself can be adjusted around the guide axis. Further, when the disc slack phenomenon occurs, the loading gear operates to slide the cam plate to tilt or raise or lower the turntable by the cam action so that the playback surface of the disc and the pickup means form a right angle. While the lifting motor installed on the carriage is operated, the pickup means can be moved up and down or tilted to maintain a constant distance between the pick-up means and the turntable. Further, the correction pinion or the correction rack moving in the horizontal movement section is overlapped or protruded by the amount of the backlash by the action of the spring, whereby the backlash is removed between the rack and the pinion.

[0038]

Brief Description of Embodiments In order to describe a preferred embodiment of the present invention, a conventional technique will be briefly described. As shown in FIG. 7, an upper stage of a spindle motor (2) (see FIG. 1) is shown. Turntable (1), rack member (101)
, The guide rail (102) and the guide shaft (110) are fixed to the lower fixing plate (100). The optical disk 10 resting on the turntable 1 is rotated by driving the spindle motor 2.

The carriage (105) is driven by a pickup means (106) for reproducing at least one surface of the optical disk and a sliding motor (not shown) so as to mesh with the rack member (101) to move the carriage (105). The pinion (107) and a horizontal guide member (108) for holding the carriage (105) in a horizontal state while being guided along the guide rail (102) on the side opposite to the pinion (107).
And a guide groove (10) that is inserted into the guide shaft and precisely guides the movement of the carriage (105) without looseness.
9) is provided.

8 to 10 schematically show an embodiment of an off-axis adjusting apparatus of the present invention for removing the above-mentioned off-axis (Δ). In this embodiment, the position adjusting plate 112 is installed on the lower surface of the lower fixing plate 100. As shown in FIGS. 8 to 10, in the present invention, the guide shaft (110) is different from the prior art, and the guide shaft support member (111) holds the guide shaft (110) at a constant height. Position adjustment plate with screws (111 ') through
It is fixed to (112) and its lower fixing plate (100)
The clearance groove (10
4) is perforated.

The position adjusting plate (112) is fixed to the lower fixing plate (100) so as to be horizontally movable in a direction perpendicular to the moving direction of the carriage (105) for removing the off-axes (Δ). That is, the position adjusting plate (112) includes a fixing screw (115) and the lower fixing plate (1).
00) formed on the screw fastening burring portion (115 ') (FIGS. 9 and 10) or the screw fastening means (FIG. 8) formed on the position adjusting plate (112). 100), but the slot (114 'or 114) through which the fixing screw (115) penetrates is formed so as to allow the above horizontal movement. Also, the fixing screw
It is desirable that (115) can be released and tightened at the top as shown in FIG. Further, it is preferable that the embossing protrusion 103 and the guide slot 113 are formed in the lower fixing plate and the position adjusting plate 112 so that the horizontal movement is guided.

In order to precisely perform the above horizontal movement laterally, a screw tightening burring portion (116 ') is formed on one flange (100') of the lower fixing plate (100), and the position adjusting plate (112) is formed. ) Is formed with a flange (112 ') having a burring portion for screw penetration on one side, and an adjusting screw is provided between the flanges (100') and (112 ') via a screw rotation prevention spring (117). (116) penetrates the burring portion of the flange (112 ') of the position adjusting plate (112) and is fastened to the burring (116') of the flange (100 ') of the lower fixing plate (100).

With the above configuration, the lower fixing plate
After assembling various parts to (100) or when an off-axis (Δ) occurs while using the optical disk player, temporarily release the fixing screw (115) and adjust the adjustment screw (1
16) by rotating the position adjusting plate (112) and the guide shaft (110) fixed to the position adjusting plate (112) horizontally, the carriage (105) inserted in the guide shaft (110). The off-axis (Δ) can be removed by moving the movement locus of the pickup means (106) of (1) in parallel.

When the off-axis (Δ) is removed, the fixing screw (115) is tightened again, and the position value adjusting plate (112) is fixed to the lower fixing plate (100). Adjustment is complete.

During the assembling work, in order to easily confirm that the lower fixing plate (100) and the position adjusting plate (112) are aligned with each other, position confirmation holes () are formed on both plates (100) (112). It is desirable to form 120) (121).

In the case of an optical disk player for double-sided reproduction, by installing the above-mentioned off-axis adjusting device also on the upper fixed plate, when reproducing the upper surface of the disk,
The off-axis that occurs is easily removed laterally.

FIGS. 11A and 11B show an embodiment different from the off-axis adjusting device of the pickup means shown in FIGS. FIG. 11A shows the lower fixing plate (1
It is the top view which showed the state in which the off-axis adjustment apparatus of the different Example was installed in (00). Unlike FIG. 8, the position adjusting plate 112 is installed on the upper surface of the lower fixing plate 100 in FIG. 11A. Therefore, the position adjusting plate (112) has a mounting opening (101 ') for the rack member (101) fixed on the lower fixing plate (100) and a protrusion of the flange (100') of the lower fixing plate (100). The opening (100 '') is formed. In addition, the fixing screw (1
15) is fastened to the lower fixing plate (100) and its fixing screw (115) slot (114) is aligned with the alignment plate (112).
Is formed. Further, it is preferable that an opening for a screw for fixing the guide shaft (110) is formed in the lower fixing plate (100). Other parts using the same reference numerals in FIGS. 8 to 10 may be the same or may be appropriately changed in FIGS. 11A and 11B.

The position adjusting plate (112) is provided with a flange (11
2 '') to reinforce the strength of the alignment plate (112). In this case, a through hole (116 '') for the adjusting screw (116) is formed in the flange (112 ''). Also in this embodiment, a spring may be installed between the flanges (100 ') and (112') as in FIGS.
As described above, the off-axis can be easily removed by using the position adjusting plate (112) only by releasing and tightening the fixing screw (115) and rotating the adjusting screw (116) without using a separate tool or jig. it can.

12A and 12E show a tangential skew adjusting device according to the present invention capable of easily adjusting the tangential skew between the pickup means and the optical disc rotation center axis on the front and upper surfaces.

One shaft (105'-d) of the pickup base (105 ') having the pickup means (106) is inserted into the circular hole (105-C) formed in one side wall of the carriage (105), and the other of the two is inserted. The other shaft (105'-d ') of the pickup base (105') is movably inserted in the U-shaped support groove (105-a) formed in the wall.

On the other side wall of the carriage (105), a supporting groove (1
05-a) with a female screw through groove (105-d) formed in the front, and a cam mold (139) is inserted into this through groove (105-b) to adjust the lower tangential skew on the outside. screw
(130) is tightened, the vertical tilt of the pickup base (105 ') is forward, and the lower tangential skew adjustment screw
It is configured to adjust by (130). A first leaf spring (137) and a second leaf spring (138) are preferably fixed to the upper and side surfaces of the other side wall of the carriage (105) so as to hold the shaft (105'-d '). .

Also, one end of a roller plate (135), which functions as a leaf spring, is hinged to the shaft of a pinion (105'-a) protruding from one side wall of the carriage (105), and the roller plate (135 ) Is equipped with a guide roller (105'-b) for guiding the carriage when playing the disc top surface, and the folding flange (105-d) of the carriage (105) has the upper flange of the bending flange (135) of the roller plate (135). The upper tangential skew adjustment screw (136) that contacts the 135a) is tightened, and the vertical tilt of the pickup base (105 ') is adjusted at the top by the upper tangential skew adjustment screw (136). ing.

The adjustment of the tangential skew according to the above-mentioned structure will be described. In FIG. 12, the lower tangential skew adjusting screw (130) is rotated on the lower surface of the disk and on the front side when adjusting the tangential skew for reproduction. Moves the cam mold (139) forward and backward,
The leaf spring (137) causes the right shaft (105'-d ') to move a little vertically up and down with respect to the left circular hole (105-c) while receiving elastic force. In this way, the lower tangential skew adjustment screw (130) is used to pick up the pickup means (10
6) The tangential skew of the pickup base (105 ') with respect to the carriage is adjusted.

The second leaf spring (138) is provided so that the pickup base (105 ') is brought into close contact with the left side thereof to serve as a reference.

When adjusting the tangential skew for reproducing the upper surface of the disc, the pickup module is set to the position shown in FIG.
As shown in 3, the upper tangential skew adjustment screw (136) is adjusted at the upper part because it is turned upside down, but the adjustment screw (136) is the flange (105-) of the carriage (105). Since it is fastened to d), the flange (135a) of the roller plate (135) is pushed or restored by tightening or loosening the adjusting screw (136), but the force causes the pinion (105'-a ), The roller plate (135) rotates slightly, and the position of the guide roller (105'-b) is adjusted so that the carriage (105) itself is tangential about the guide shaft (110). The skew can be adjusted.

As described above, the tangential skew adjusting device according to the present invention has an advantage that the tangential skew can be easily and easily adjusted by only screw rotation on the front and upper portions.

A preferred embodiment of the tilting and lifting device according to the present invention for maintaining the above-mentioned radiating optical axis of the pickup means at right angles to the radiating portion of the disk is as follows.

As shown in FIGS. 14 and 15, the loading (213) driven by the loading motor (212).
A pair of U-shaped racks (221) are installed on the lower fixing plate (211) on which the motor base (231) is loosely installed on one side of the U-shaped rack (221), and the spindle motor (2
After mounting 32), the turntable 233 is pivotally mounted on the spindle motor 232. In this way, the motor base (231) with the turntable (233) and the spindle motor (232) attached to it is set free on the lower fixing plate (211), and the cam follower is attached to one side of the tip of the motor base (231). Form (235).

A rack gear for forming a cam section (242) for swinging the cam follower (235) so as to achieve a predetermined tilting is formed on an upper surface and meshed with a loading gear (213) for sliding operation. A cam plate (241) having a side surface (243) is provided to interact with the lower fixing plate (21) to guide the sliding motion.
1) and guide pins (214) on the cam plate (241) respectively
A guide slot (244) is formed and a spring (236) is installed so that the cam follower (235) slides on the cam cross section (242).

Then, a pickup means (252) for reading the record of the disk (210) mounted on the turntable (233) is moved along the U-shaped rack (221) attached to the lower fixing plate (211). ) Loaded carriage (2
51) comprises lifting means for moving up and down the pickup means (252).

The lifting means includes a carriage (25
1) Pick up by installing guide brackets (253) formed on both left and right side walls on both left and right sides so that the guide elongated hole (253a) intersecting with the elongated elongated lifting hole (251a) is inclined. Means (252) After connecting the guide pins (252a) at both ends to the intersection of the lifting long hole (251a) and the guide long hole (253a), the pins (253b) formed on the guide bracket (253) are lifted. It is connected to the guide groove (255a) of the lifting gear (255) driven by the motor (254) and driven by the lifting motor (254).
3) While sliding, the pickup means (252)
Is configured to be raised and lowered.

Another embodiment of the tilting and lifting device of the present invention is a rotary lifting device (not shown) having a separate turntable 233 as shown in FIG.
Lifting operation by the U-shaped rack
A disc (2) is attached to a carriage (251) that moves along (221).
The pickup means (212) for reading the record of (10) is installed, the tilting motor and the cam gear (256) driven by the tilting motor are installed on the carriage (251), and the cam cross section of the cam gear (256) ( 256A) pickup means (2
The turntable is detected by the spring (257) so that the cam follower (252b) formed integrally with the 52) slides.
(233) is lifted and the pickup means (252) is tilted by a separate motor.

First, the lower motor fixing plate (211) having the U-shaped rack (221) is provided with the rotating motor (212) and the rotating gear (213), which are moved by the belt. The loading gear (213) is provided with the cam plate (241) so that the rack gear (243) is meshed with and interlocked with the loading gear (213).
At the lower part of 3), install a mode switch (not shown) that can check the mode of the cam plate (241).

As described above, the motor base (231) is installed on the lower fixing plate (211) on which the cam plate (241) is installed, and the cam follower (235) formed on one side of the tip is attached. After holding the spring (236) so that it slides on the cam section (242), the spindle motor (232) with the turntable (233) attached to it is attached to the motor base (231) to tilt the motor. Assembly of the device is completed. Next, the assembling of the lifting device is completed by installing the guide bracket (253) operated by the lifting motor (254) on the pickup carriage (251) which moves along the U-shaped rack (221).

The operation of the tilting and lifting device of the present invention constructed as described above is as follows.

In the present invention constructed such that the turntable 233 is tilted and the pick-up means 252 is lifted, first, a tray (not shown) is driven while the loading motor 212 is driven. (210) is mounted on the turntable (233) and the spindle motor (23
The disk (210) rotates while (2) is operated. Along with this, the carriage (251) is driven by the sliding gear (258) to move along the U-shaped rack (221), and the pickup means (252) installed on the pickup carriage (251) reads the disc record. Become.

At this time, as shown in FIG. 6, the disc (210)
When the sagging phenomenon occurs, the loading gear (212) operates and the cam plate (241) moves as shown in FIGS. 16 and 17.
By sliding the disk so that the turntable (233) is inclined by the cam action.
The playback surface of the pickup and the pickup means (252) form a right angle, and the lifting motor (254) installed on the carriage (251) is operated while the pickup means (25
By raising and lowering (2) to keep the distance between the pick-up means (252) and the turntable (233) constant, an accurate reproduction operation can be performed.

The above operation is the same in other embodiments in which the carriage 251 is tilted and the turntable 233 is lifted.

As described above, the tilting and lifting device according to the present invention uses the loading motor to perform the tilting operation to reduce the weight of the pickup module and simplify the structure. It is a novel and useful invention that not only enables accurate search operation but also shortens the time required here and improves the reliability of the product because there is no risk of failure.

19 and 20 show an embodiment of the backlash removing device according to the present invention.

As shown in the drawing, two pinions (304) (304 ') are installed on the right side of one end of the synchronizing shaft (309) of the pickup carriage (302).
4) That is, the power transmission pinion is inserted so as to be fixed to the synchronizing shaft (303), and the other pinion (304 '), that is, the correcting pinion is slidably rotatable on the synchronizing shaft (303). , And the two pinions (304) (304 ') are connected by a conical spring (307) and felt (305) clutch structure.

A pinion (304a) is pushed into the left side of the other end of the synchronizing shaft (303) of the carriage (302) so as to be fixed, and a turning roller (309) is placed outside the pinion (304a). Are rotatably coupled to the synchronization axis (303). The right U-shaped rack (311) is formed with rack gears for the horizontal movement section and the turning section, and the left U-shaped rack (310) is formed with rack gears only for the turning section.

The pinion (304a) (304) is connected to the synchronization axis (30
In order to be fixed and synchronized with 3), a D shape can be formed as in FIG. 20 (B).

More specifically, the pickup base (301) to which the pickup means (301a) is fixed is coupled to the carriage (302) using the shafts (301b) fixed to both sides, and the carriage (302) is The synchronizing shaft (303), which is partially cut in D shape, is inserted in the (302) and the synchronizing shaft (3
On the left side of 03), first push in the pinion (304a) having the D-shaped cutting part, slide the turning roller (309) so that it is located outside the pinion (304a), and then tighten the stop washer (308). .

After inserting the slide washer (306) to the right side of the synchronizing shaft (303), the conical spring (307) is inserted.
Insert the slide washer (306) again,
After inserting the pinion (304 ') without the D-shaped cutting part in the center by sliding, the felt (305) is inserted. A pinion (304) having a D-shaped cutting portion is pushed into the outer side of the felt (305), and a stop washer (30
6) Tighten, insert turning roller (309) and then stop washer (308).

The pick-up module assembled in this way is again seated on the left U-shaped rack (310) and the right U-shaped rack (311) which are clamped on the lower fixing plate (312), thereby turning on the left side. Roller (30
9) contacts the guide member (310b) of the left U-shaped rack (310) first, and on the right side, the right pinion (304) and the gear part (311a) of the right U-shaped rack (311) mesh and rotate. become.

All the gear parts (311a) formed on the right U-shaped rack (311) are used during sliding and turning, and the gear parts (310a) are provided on the left U-shaped rack (310).
Is formed so that the left side pinion (304a) is used only during turning.

The rotational force for the carriage to move horizontally inside and outside the optical disk during reproduction is controlled by a sliding motor (not shown) in the pick-up module by the synchronizing shaft (303), the left pinion (304a), and the right side. It is transmitted integrally to the pinion (304). Left and right pinion (304a)
(304) will rotate synchronously, but the right pinion (3
Only 04) meshes with the gear part (311a) of the U-shaped rack (311) on the right side to enable the movement of the carriage.

The horizontal state of the pickup carriage is maintained by the guide shaft (314) fixed to the lower fixing plate (312) and the turning roller (309).

With the above structure, the pinions (304) (304 ') are not completely synchronized by the action of the spring and the felt when moving in the horizontal movement section, and the pinions (304) (304') are out of gear with each other. Overlap by rush amount (ov
erlap), which removes the backlash between the rack and the binion.

21 and 22 show another embodiment of the backlash removing device of the present invention. Here, instead of providing the correcting pinion (304 ') in the one embodiment, the right side U
On the side of the gear (311a) of the rack (311), the correction rack (31
3) is attached.

That is, the correction rack (313) is fixed to the side surface of the U-shaped rack (311) on the right side by inserting screws into the long holes (313a) formed on both sides of the correction rack (313). The leaf springs (314) are fixed to both sides of the rear surface of the right U-shaped rack (311) as shown in FIG.

Further, the gear portion of the right U-shaped rack (311)
(311a) is formed in the horizontal movement section and the turning section, but the correction rack (313) is the right U-shaped rack (31).
1) It should be installed only in the horizontal movement section above and below.

The pickup base (301), carriage (302), synchronizing shaft (303) and pinion (304) (304)
The two side pinions (304) (304a) of the pickup module assembled in a) are all inserted into the D cutting parts formed at both ends of the synchronizing shaft.

When sliding, the carriage has a gear portion (311a) of the right U-shaped rack (311) and a correction rack (311).
13), U-shaped rack on the left side when turning
(310) and right U-shaped rack (311) gear (310a) (311a)
To use.

As described above, in another embodiment of the backlash removing device of the present invention, the pinion (30
4) Instead of installing (304 ') in duplicate, the rack axis is a double rack, that is, the right U-shaped rack (311) and the compensation rack (3
Backlash is eliminated by the configuration of 13).

[0087]

As described above, according to the off-axis and tangential skew adjusting device, the tilting and lifting device, and the backlash removing device according to the present invention, the pick-up means is provided on the side, front and top without a separate adjusting device. The off-axis and tangential skew of the pickup can be easily adjusted, and the weight of the pickup module can be reduced and the structure can be simplified by tilting or lifting the turntable using the loading motor. The backlash between the pinion and the rack member for moving the module can be easily removed, so that not only a good playback screen and quick and accurate search, but also the excellent effect of improving the volume production and reliability of the product Can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic side view showing a conventional optical disc player for double-sided performance.

FIG. 2 is a schematic front view of FIG.

FIG. 3 is a schematic plan view showing the structure of a conventional carriage on which pickup means is loaded.

FIG. 4A is a schematic plan view showing an ideal structure in which an extension line of a movement locus of a pickup means intersects with a rotation center of a disc, and FIG. 4B is an off-axis due to processing and assembly tolerances. It is a schematic plan view showing the state.

5A shows a state in which off-axis (Δ) and tangential skew (α) are generated, and FIG. 5B shows a state in which only off-axis (Δ) is generated. FIG. 3 is a schematic diagram of a relationship between a traveling optical axis and a central axis of a spindle motor.

FIG. 6 is a diagram illustrating a tilting and lifting operation state of a conventional pickup unit due to disc slack.

FIG. 7 is a schematic plan view of a simplified conventional optical disc player for explaining the present invention.

FIG. 8 is a view similar to FIG. 7 with an embodiment of an off-axis adjustment device according to the present invention.

9 is a front view of FIG. 8. FIG.

FIG. 10 is a side view of FIG. 9.

11A is a view similar to FIG. 7 with another embodiment of the off-axis adjustment device according to the present invention, FIG.
11 (B) is a front view of FIG. 11 (A) showing a state in which the off-axis adjusting device of FIG. 11 (A) according to the present invention is also installed on the upper portion.

FIG. 12 is a view showing a tangential skew adjusting device according to the present invention, and FIG. 12 (A) is a plan view showing a structure of a pickup means, a pickup base, and a carriage. 12B is a front view of FIG. 12A, FIGS. 12C and 12D are left and right sides of FIG. 12A, and FIG. 12E is a lower tangential provided to the carriage. It is an expanded sectional view which showed the structure of a skew adjusting screw and a cam mold in detail.

FIG. 13 is a schematic front view of the pickup module in the inverted state for explaining the working relationship between the upper tangential skew adjusting screw and the roller plate.

FIG. 14 is a schematic plan view of an optical disc player including an embodiment of a tilting and lifting device according to the present invention.

FIG. 15 is a front view of FIG.

16 is a view similar to FIG. 15 showing an operating state due to downward slack of the disc.

FIG. 17 is a view similar to FIG. 15 showing an operating state due to upward slack of the disc.

18 is a view similar to FIG. 15 showing another embodiment of the tilting and lifting device according to the present invention.

19A is a plan view showing a configuration of an embodiment of a backlash removing device according to the present invention, and FIG.
FIG. 19B is a right side view of FIG.

20 (A) is a front view of FIG. 19 (A), and FIG.
0 (B) is a schematic view illustrating the coupling structure between the synchronization axis and the pinion.

21 (A) is a view similar to FIG. 19 (A) showing the configuration of another embodiment of the backlash removing device according to the present invention, and FIG. 21 (B) is the right side of FIG. 21 (A). It is a side view.

FIG. 22 is a front view of FIG.

[Explanation of symbols]

1: Turntable 3, 4, 109, 110, 315: Guide member or shaft 5, 105, 251, 302: Carriage 6, 106, 252, 301a: Pickup means 10, 210: Disc (105'-a), ( 105'-a '), 107, 258, 304, 304a: Pinion 101, 221, 310, 311: Rack member 100, 211, 312: Lower fixing plate 112: Position adjustment plate 116: Adjustment screw 139: Mold 135 for cam : Roller plate 231: Motor base 241: Cam plate Δ: Off-axis α: Tangent skew 304 ': Correction pinion 313: Correction rack

 ─────────────────────────────────────────────────── ─── Continuation of front page (31) Priority claim number P92-27624 (32) Priority date December 31, 1992 (33) Priority claim Korea (KR)

Claims (20)

[Claims] 1. An optical disc player having a pickup means for reproducing at least one side of an optical disc, the pickup means for an optical disc player for removing an off-axis between an extension line of a movement locus of the pickup means and the center of the optical disc. In an off-axis adjustment device, a carriage having a pinion and a guide groove for loading and moving the pickup means, and one or more rack members for interacting with the pinion of the carriage to move the carriage are fixed. At least one fixing plate and a guide shaft for guiding the guide groove of the carriage are fixed, and the off-axis can be removed on one surface of the upper and lower surfaces of the one or more fixing plates. Move horizontally with respect to fixed plate An off-axis adjusting device for a pickup means for an optical disc player, comprising one or more position adjusting plates fixedly possible. 2. The one or more fixing plates and the position adjusting plate each have a flange so that the horizontal movement of the position adjusting plate with respect to the one or more fixing plates is performed laterally. The off-axis adjusting device for the pickup means for an optical disk player according to claim 1, wherein a screw is installed. 3. A burring portion having a female screw portion to which the adjusting screw is tightened is formed on a flange of the one or more fixing plates, and a penetrating hole into which the adjusting screw is inserted is formed on a flange of the position adjusting plate. 3. An off-axis adjusting device for an optical disk player pickup means according to claim 2, wherein a burring portion having a mouth is formed, and a compression spring is installed between both flanges of the burring portion. 4. The off-axis adjusting device of the pickup means for an optical disk player as claimed in claim 1, wherein means for guiding the horizontal movement is formed between the one or more fixed plates and the position adjusting plate. . 5. The off-axis adjusting apparatus for an optical disk player as claimed in claim 4, wherein the means for guiding the horizontal movement comprises an embossing protrusion and a guide slot for the protrusion. 6. The off-axis adjusting device of the pickup means for an optical disc player according to claim 1, wherein the position adjusting plate is fixed to the one or more fixing plates at an upper portion. 7. The pick-up means for an optical disc player as claimed in claim 1, wherein a groove is formed between the position adjusting plate and the one or more fixing plates for confirming an assembled position. Off-axis adjustment device. 8. The apparatus according to claim 1, wherein the position adjusting plate is provided to each of the upper fixing plates. 9. An optical disc player having a pickup means fixed to a pickup base for reproducing at least one side of an optical disc, for adjusting a tangential skew between the disc rotation axis of the pickup means at a reproduction position of the disc. In the tangential skew adjustment device for optical disc player pickup means, a circular hole into which one side shaft of the pickup base is inserted and a U-shaped support groove into which the other side shaft of the pickup base is vertically movable. And a carriage having a female threaded through hole communicating with the support groove at a right angle to the front side of the support groove and having a pinion for loading and moving the pick hoop base, the carriage being installed in the through groove of the carriage. The cam movement caused by the rotation of the screw causes the picker to move. A cam mold and an adjusting screw for moving the other side shaft of the pickup base up and down in the U-shaped support groove of the pickup carriage, and an elastic force to the other side shaft of the pickup base at the upper opening of the U-shaped support groove of the carriage. A tangential skew adjusting device for a pickup means for an optical disk player, which includes an upper surface leaf spring for applying a force. 10. The optical disk player according to claim 9, further comprising a side leaf spring for applying an elastic force to the other side shaft of the pickup base on the outer side surface of the U-shaped support groove of the carriage. A tangential skew adjustment device for the pickup means. 11. In order to adjust the tangential skew of the pickup means with respect to the disc rotation axis at the reproduction position on the other surface of the optical disc, one end of the pickup carriage is hinged to the shaft of one side pinion, and the optical disc is mounted. A roller plate that plays a role of a leaf spring in which the guide roller at the reproduction position on the other surface is pivotally attached to the other end, and the other roller plate so that the position of the guide roller with respect to the carriage can be adjusted. 10. The tangential skew adjusting device for pickup means for an optical disk player according to claim 9, further comprising means for angularly displacing the end portion around the pinion shaft on one side. 12. A flange for forming the angular displacement means formed on the carriage, an adjusting screw screwed to the flange, and the roller plate for angularly receiving the rotational force of the adjusting screw. 12. A flange formed on the other end of the
A tangential skew adjustment device for a pickup means for an optical disc player as described above. 13. A lower fixed plate on which a loading gear driven by a loading motor is installed and a pair of U-shaped racks are installed; and a motor base which is loosely installed on one side of the U-shaped rack of the lower fixed plate. ,
A spindle motor attached to the motor base; a disc turning means having a turntable pivotally attached to the spindle motor; a tilting means for inclining the disc turning means by the loading; and a lower fixing plate. A carriage equipped with a pickup means that moves along the attached U-shaped rack and reads the recording of the disk mounted on the turntable; and a lifting means that is installed on the carriage and moves up and down the pickup means. A tilting and lifting device for pick-up means of a characteristic optical disk player. 14. The tilting means has a cam cross section formed on an upper surface thereof, and a cam plate which is slid by a rack gear formed on a side surface which meshes with a loading gear, and a sliding movement when the rack gear meshes with the loading gear. Guide means to guide,
2. A cam follower installed on one side of a tip of the motor base so as to incline the disc turning means by sliding on the cam cross section.
3. A tilting and lifting device for pickup means of the optical disc player described in 3. 15. The guide means includes a guide pin fixed to the lower fixing plate and a guide elongated hole formed in the cam plate for inserting the guide pin and guiding the sliding movement of the cam plate. 15. A tilting and lifting device for pick-up means of an optical disc player according to claim 14. 16. The lifting means includes a pair of lifting slots formed long on the left and right sides of the carriage and extending upward and downward, and a guide slot that is inclined with respect to the lifting slot. A guide bracket provided with a pin that is bound to a guide groove of a lifting gear driven by a motor to allow the guide bracket to slide horizontally by the rotation of the lifting motor, and a horizontal sliding operation of the guide bracket of the pickup means. 14. The tilting and lifting of the pick-up means of the optical disk player according to claim 13, further comprising a guide pin fixed to the pick-up means, the guide pin being coupled to the lifting oblong hole and the guide oblong hole for switching to a vertical lifting operation. apparatus. 17. The tilting and lifting device for a pickup means of an optical disc player according to claim 13, wherein the tilting means tilts the ledge, and the lifting means raises and lowers the disc turning means. . 18. A backlash removing device for removing backlash between a pinion and a rack gear in an optical disk player including a pinion gear and a rack gear for transmitting power for movement of a pickup carriage and turning. It is installed in parallel to either of the rack gear and the rack gear so that it can move relative to the other,
Of the pinion gear and the rack gear, the correction gear of the same kind as the one gear meshed with the other one, and the correction gear is elastic so as to remove the backlash between the pinion gear and the rack gear. A backlash removing device comprising a spring means for applying a force. 19. The correction gear is a pinion gear that is installed in parallel on the same axis as the pinion gear via a felt, and the spring means is provided in the correction pinion gear. 19. The backlash removing device for removing backlash between the pinion gear and the rack gear of the optical disk player according to claim 18, wherein the backlash removing device is a conical spring that applies elastic force to the. 20. The correction gear is a rack gear installed in parallel with the rack gear in a movement section of a pickup carriage, and the spring means transmits the correction rack gear to the power transmission pinion gear. 19. A backlash removing device for removing backlash between a pinion gear and a rack gear of an optical disk player according to claim 18, wherein the backlash removing device is a leaf spring that applies an elastic force so as to slightly project from the rack gear.