JP3874902B2 - Disc player - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disk reproducing apparatus for reproducing an optical disk such as a CD (Compact Disc), a CD-ROM, a DVD (Digital Versatile Disc), and a DVD-ROM, and more particularly to a skew adjusting mechanism thereof.
[0002]
[Prior art]
In a disk drive that reproduces a high-density optical disk such as a CD player, a DVD player, or a CD-ROM drive or a DVD-ROM drive, the optical axis of the optical pickup is orthogonal to the disk surface during the assembly process. It is necessary to perform adjustment (skew adjustment). As a skew adjustment method, for example, the following methods are conventionally known. The method shown in FIG. 23 is a method of adjusting the height of three support points among a total of four support points at both ends of the two guide shafts 102 that support and guide the optical pickup 101. The height of each fulcrum is adjusted by the rotational position of the adjusting member 103 that supports the guide shaft 102 with a tapered surface. The method shown in FIG. 24 is a method in which the height of three points of the disk motor 104 is adjusted by the screw 105. The skew adjustment is performed by adjusting the tangential skew and the radial skew. Tangential skew adjustment is an adjustment to make the optical axis of the optical pickup orthogonal to the disk surface when viewed from the direction of the movement locus (normal line) of the beam spot on the optical disk's disk reflection surface. The radial skew adjustment is an adjustment for making the optical axis of the optical pickup orthogonal to the disk surface when viewed from the direction orthogonal to the normal line on the disk surface.
[0003]
[Problems to be solved by the invention]
When such skew adjustment is performed in the conventional methods, in the former method of adjusting the optical pickup side, one adjustment affects the other adjustment. That is, since tangential skew adjustment and radial skew adjustment cannot be performed independently, it is inevitable that time is required for skew adjustment. In addition, there is a problem in that the normal line is deviated from the center of the disk due to the tangential skew adjustment.
[0004]
The present invention is intended to solve such problems, and performs tangential skew adjustment and radial skew adjustment independently and accurately and efficiently.Can be adjusted easily and easily in the adjustment process before factory shipment.An object of the present invention is to provide a disc reproducing apparatus that can handle the above.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a disk reproducing apparatus of the present invention includes a motor for driving a disk, a turntable that is directly connected to a rotating shaft of the motor, a motor base on which the motor is mounted, A substrate on which the motor base is mounted, and a travel locus line of a beam spot of an optical pickup that is provided on the substrate and scans the motor base on the turntable in the radial direction thereofThe blade movement is supported centering on an orthogonal line perpendicular to the motor base parallel to the beam spot traveling locus line and its disk surface.A motor base movable bearing device that supports the motor base, and a holding device that holds the motor base on the motor base movable bearing device;An eccentric pin provided on the substrate and configured to adjust a pendulum swinging posture around the beam / spot travel locus line of the motor base held on the motor base movable support device; and provided on the substrate, A spiral cam that adjusts the blade movement posture of the motor base that is held on the motor base movable support device about the beam spot traveling locus orthogonal line, and the eccentric pin is on the back side of the substrate And the spiral cam has an adjustment operation part exposed on the back side of the substrate.It is characterized by that.
[0006]
By having the above configuration, tangential skew adjustment and radial skew adjustment can be performed accurately and efficiently independently, and skew adjustment can be easily and easily performed in the adjustment process before factory shipment. it can.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.
[0010]
1 and 2 are perspective views showing a DVD-ROM drive according to an embodiment of the present invention.
[0011]
Reference numeral 1 denotes a tray on which a disk is placed, and 2 denotes a mechanism unit as a drive main body. The tray 1 can be inserted into and removed from the mechanism unit 2 along the surface direction of the disk placed on the tray 1. Guide pins 1a project from both side surfaces of the tray 1, and these guide pins 1a are fitted into guide grooves 2a of the mechanism unit 2 and supported and guided by the guide grooves.
[0012]
A substrate 4 is supported on the bottom of the mechanism unit 2 via a buffer member 3 such as a damper rubber. A disk motor (not shown) for driving the turntable 5, an optical pickup 6, and a pickup feed mechanism (feed motor 7, guide shaft 8, etc.) are mounted on the substrate 4.
[0013]
The mechanism unit 2 holds a clamper 10 via a clamper holder 9 (see FIG. 2). Further, a drive mechanism (not shown) for tray loading and disk clamping is provided in the mechanism unit 2.
[0014]
Details of each part will be described below.
[0015]
The tray will be described with reference to FIGS.
[0016]
The tray 1 includes a tray frame 11 and a tray lifting / lowering movable portion 12 supported by the tray frame 11 so as to be movable up and down (in the thickness direction of the disk). The tray elevating movable unit 12 includes a concave portion 12a on which the disc is placed, a disc reading opening 12b for inserting a turntable and an optical pickup, and four discs for preventing the disc from dropping from the concave portion 12a. A drop-off stopper 13 is provided.
[0017]
As shown in FIG. 3, each disk drop stopper 13 is rotatable between a position indicated by a solid line and a position indicated by a dotted line. When each disk drop stopper 13 is in the dotted line position, the disk D is prevented from dropping from the disk mounting recess 12a. When the disk drop stopper 13 is in the solid line position, the disk is not locked by the disk drop stopper 13. It is in a state where it is simply placed in the placement recess 12a. FIG. 3 shows a state in which the tray 1 is loaded in the mechanism unit 2. At this time, the disk D is prevented from dropping from the disk mounting recess 12a by the disk drop stopper 13.
[0018]
Each disk drop stopper 13 rotates simultaneously with the raising / lowering of the tray raising / lowering movable portion 12 with respect to the tray frame 11. As shown in FIGS. 1 and 2, the tray elevating movable unit 12 has a height at which the upper end of the main surface is flush with the upper end surface of the tray frame body 11 and the upper end of the main surface is the upper end surface of the tray frame body 11. When the tray elevating movable unit 12 is at a height that is flush with the upper end surface of the tray frame 11, each disk drop stopper 13 is in the disk drop prevention position. When it is positioned and at a height that is lowered by a certain distance H from the upper end surface of the tray frame 11, it is positioned at the disk non-locking position.
[0019]
A mechanism for interlocking the raising / lowering of the tray raising / lowering movable part 12 and the rotation of the disk dropping stopper 13 will be described with reference to FIGS.
[0020]
4 is a cross-sectional view when the disk drop stopper 13 is positioned at the disk locking position, and FIG. 5 is a plan view thereof. FIG. 6 is a cross-sectional view when the disk drop stopper 13 is positioned at the disk non-locking position, and FIG. 7 is a plan view thereof.
[0021]
As shown in these drawings, the disk drop stopper 13 is rotatably supported by a lift guide pin 21 protruding from the tray lift movable portion 12. The tip portion of the lifting guide pin 21 is inserted into a pin insertion hole 11a provided in the tray frame 11, and the lifting guide pin 21 of the lifting guide pin 21 is prevented from being detached from the pin insertion hole 11a. A large diameter portion 21a is provided at the forefront.
[0022]
A coil spring 22 is externally fitted to the lifting guide pin 21, and the coil spring 22 generates a biasing force in a direction in which the tray lifting / lowering movable portion 12 is lifted from the tray frame body 11. One end of the coil spring 22 is fixed to the spring stopper 13 a of the disk drop stopper 13, and the other end is fixed to the spring stopper 11 b of the tray frame 11. As a result, the coil spring 22 also generates a force for urging the disk drop stopper 13 in the rotational direction indicated by the arrow R with the lifting guide pin 21 as a fulcrum.
[0023]
Further, the disc drop stopper 13 is provided with a release pin 23 protruding in the disc surface direction. The release pin 23 is in contact with a pin guide 24 provided on the tray frame 11. The pin guide 24 guides the release pin 23 in accordance with the raising / lowering of the tray lifting / lowering movable portion 12 with respect to the tray frame body 11 and rotates the disk drop stopper 13 with the lifting guide / pin 21 as a fulcrum.
[0024]
Next, the operation when the disk D is placed on the tray 1 will be described.
[0025]
The tray lifting / lowering movable portion 12 and each disk drop stopper 13 are in the position state (a state in which the disk can be prevented from being dropped) shown in FIGS. 4 and 5 by the urging force of the coil spring 22.
[0026]
When the disk D is placed on the tray 1, the tray lifting / lowering movable portion 12 is lowered to the full extent in the tray frame 11 while resisting the urging force of the coil spring 22 with a finger or the like. As shown in FIGS. 1 and 2, the tray elevating movable unit 12 is provided with a mark 25 that indicates the most suitable position as a finger contact position when the tray is moved down with a finger. The user can easily understand how to place the disc.
[0027]
When the tray lifting / lowering movable portion 12 is lowered, the release pin 23 protruding from the disk drop stopper 13 is guided by the pin guide 24 provided on the tray frame 11, and as a result, the disk drop stopper 13 rotates the coil spring 22. It rotates in the direction against the urging force. When the tray raising / lowering movable part 12 is lowered to the full, the disk drop stopper 13 rotates to the disk non-locking position as shown in FIGS. Therefore, the disk D is dropped into the recess 12a of the tray 1, and the disk placement work on the tray is completed.
[0028]
When the finger is released from the tray lifting / lowering movable portion 12, the tray lifting / lowering movable portion 12 returns to the original height position by the urging force of the coil spring 22, and at the same time, each disk drop stopper 13 rotates to the disk locking position.
[0029]
In FIG. 7, reference numeral 26 denotes a holding rib for fixing the disk drop stopper 13 at the disk non-locking position. The disk drop stopper 13 is further rotated from the rotation position shown in FIG. 7 in a direction against the rotational biasing force of the coil spring 22, and the hold pin 13 b provided on the disk drop stopper 13 is fitted into the hold rib 26. The disk drop stopper 13 is fixed at the disk non-locking position. When the DVD-ROM drive is used in a horizontal recumbent posture, the disk drop stopper 13 is actually unnecessary, and in this case, it is desirable to fix the disk drop stopper 13 at the disk non-locking position.
[0030]
As shown in FIGS. 8 and 9, a taper 13 c may be provided on the upper surface of the tip of the disk drop stopper 13. With this configuration, when the disk D is placed, the outer periphery of the disk hits the tapered surface 13a, and when the disk D is pushed in as it is, the disk drop stopper 13 rotates in the direction of the arrow so that the disk placement recess 12a becomes Open. Therefore, the disk D can be placed on the tray without performing an operation of pushing down the tray lifting / lowering movable portion 12 with a finger.
[0031]
For example, when this DVD-ROM drive is used in a vertical standing posture, the lower part of the outer periphery of the disk is first fitted inside the two lower disk drop stoppers 13, and then the disk is inserted inside the two upper disk drop stoppers 13. The lower periphery may be fitted in the manner described above (by pushing the disc). Since the taper 13d that allows the disc to be fitted in an oblique posture is provided on the back surface of the tip end portion of the disc drop stopper 13, the insertion of the lower portion of the outer periphery of the disc is not sufficient to push the disc. As a result, the disc can be mounted on the tray with one hand.
[0032]
Further, the taper 13d on the rear surface of the front end of the disk drop stopper 13 hits the outer periphery of the disk when the disk is taken out of the tray, and the disk drop stopper 13 is rotated in the same manner as the taper 13c on the upper surface of the front end of the disk drop stopper 13. Therefore, the disc can be taken out from the tray with one hand.
[0033]
Next, the disk clamping mechanism will be described with reference to FIGS. 1, 2, 10 and 11. FIG.
[0034]
As shown in FIGS. 2 and 10, the clamper 10 is fitted into a hole 9 a provided in the clamper holder 9 and is pressed from above by a housing 51 on the upper side of the DVD-ROM drive.
[0035]
The clamper 10 is integrally provided with a leaf spring portion 10a. The leaf spring portion 10 a is provided so as to protrude from the clamper body portion 10 toward the back surface of the upper housing 51, and when the tip portion 10 b is in contact with the surface of the housing 51, the clamper 10 is moved to the clamper holder 9. A biasing force that biases the hole 9a is generated. The clamper 10 is attached with a magnet plate (or metal plate) 10 b that is magnetically attached to the turntable 5.
[0036]
As shown in FIGS. 1 and 2, the clamper holder 9 includes three clamp guide pins 9b and 9c on both side portions bent at right angles to a plate having a hole 9a for holding the clamper. , 9d. Of these guide pins, two guide pins 9b and 9c are fitted into the vertical guide portion 2b provided on the side surface of the housing of the mechanism unit 2, and the other guide pins 9d are provided on the clamp slider 31. The cam groove 31a is inserted.
[0037]
The clamp slider is driven back and forth in the loading direction of the tray 1 by a driving mechanism described later. As shown in FIG. 1, the guide pin 9d of the clamper holder 9 is at the uppermost position of the cam groove 31a provided in the clamp slider 31 when the tray 1 is ejected, and as shown in FIG. When the tray 1 is at the disc clamp completion position in the mechanism unit 2, it is at the lowest position of the cam groove 31a. That is, the clamper holder 9 is configured to move up and down by the forward and backward movement of the clamp slider 31.
[0038]
The vertical guide portion 2b provided on the side surface of the casing of the mechanism unit 2 guides the guide pins 9b and 9c of the clamper holder 9 only in the vertical direction when the clamper holder 9 is raised and lowered. 9 moves up and down in the thickness direction of the disk while fixing the position on the plane along the disk surface.
[0039]
The disk clamping operation will be described with reference to FIGS.
[0040]
FIG. 10A shows a state when the tray is loaded, and corresponds to the state from (a) to (b) in the plan view of FIG. At this time, the clamper 10 is at the uppermost position and is in close contact with the ceiling surface of the casing 51. Thereafter, loading of the tray 1 is executed, and when the tray 1 is inserted to a predetermined position in the mechanism unit 2 (after completion of tray loading in FIG. 11B), the clamp slider 31 starts moving, The clamper holder 9 starts to descend.
[0041]
FIG. 10B shows a state where the clamper holder 9 is being lowered. When the clamper holder 9 descends, that is, moves away from the ceiling surface of the casing 51, the clamper 10 follows the lowering of the clamper holder 9 while being in close contact with the clamper holder 9 by the urging force of the leaf spring portion 10a.
[0042]
When the clamper holder 9 is lowered, the tray operation pin 32 protruding from the lower surface of the clamper holder 9 presses the raising / lowering movable portion 12 of the tray 1 from above and lowers the tray frame body 11. As a result, as shown in FIG. 11C, the disk locking state by each disk drop stopper 13 of the tray 1 is released.
[0043]
Further, the disk D placed on the tray 1 is lifted from the disk placement recess 12 a by the turntable 5 by the lowering of the tray lifting / lowering movable portion 12. The distance between the center boss 5a of the turntable 5 and the clamper 10 is reduced by the further lowering of the tray lifting and lowering movable portion 12, and the center boss 5a is completely fitted into the center hole of the disk D by the magnetic attraction force between the two. Thus, disc clamping by the turntable 5 and the clamper 10 is completed.
[0044]
FIG. 10C shows the completed state of the disk clamp. In this disk clamp completion state, the clamper 10 is in a position floating from the clamper holder 9, and the leaf spring portion 10 a of the clamper 10 is separated from the inner surface of the housing 51.
A centering member 5b is elastically supported by the center boss 5a via a spring for centering the disk. This centering member 5b has a taper surface around it, and is pressed downward by contacting the center hole of the disk D with this taper surface when the disk is clamped.
[0045]
Next, the tray loading and disk clamp drive mechanism will be described with reference to FIGS.
[0046]
12 and 13 show the entire components of the tray loading and disk clamp driving mechanism, and FIGS. 14 and 15 show only the mechanism part related to the disk clamp.
[0047]
12 and 14 show the state when the tray is discharged before loading the tray (the state shown in FIGS. 1 and 11A), and FIG. 13 shows the state when the loading of the tray 1 is completed (FIG. 11B). FIG. 15 shows the state when the disk clamping is completed (the state shown in FIGS. 2 and 11C).
[0048]
In FIG. 12, reference numeral 35 denotes a motor. The power of the motor 35 is transmitted to the gear 37 through the worm gear 36, and further transmitted to the slider 39 through the gear 37 a and the rack gear 38 that are coaxial with the gear 37. As a result, the slider 39 slides in the directions of arrows Y1 and Y2 in the figure. However, it moves in the Y2 direction from the state of FIG.
[0049]
The slider 39 is provided with two cam grooves 40 and 41. A guide pin 42a of the arm 42 is inserted into one cam groove 40 indicated by a solid line, and a guide pin 31c of the clamp slider 31 is inserted into the other cam groove 41 indicated by a dotted line. Accordingly, the guide pins 42a and 31c are guided by the cam grooves 40 and 41 by the movement of the slider 39, and the arm 42 and the clamp slider 31 operate.
[0050]
The arm 42 rotates in the directions of arrows R1 and R2 about the fixed shaft 43 as a fulcrum by the guide pin 42a guided by the movement of the slider 39. However, it moves in the R2 direction from the state of FIG. A rack gear 42b is provided at the tip of the arm 42, and a gear 44 is engaged with the rack gear 42b. The gear 44 meshes with a load rack gear 45 provided on the tray 1. Therefore, the tray 1 is loaded in the mechanism unit 2 by the rotation of the arm 42 in the arrow R2 direction.
[0051]
The rotation range of the arm 42 is limited by a cam groove 40 provided in the slider 39. That is, the arm 42 rotates from the time when the guide pin 42a is in the position shown in FIG. 12 of the cam groove 40 to the time shown in FIG. However, the cam groove 40 for guiding the guide pin 42a of the arm 42 guides the guide pin 37a further along the moving direction (Y2 direction) of the slider 39 than the pin position of the arm rotation end shown in FIG. It is provided in such a shape.
[0052]
On the other hand, as shown in FIGS. 14 and 15, the clamp slider 31 is supported by the mechanism unit 2 by a guide member (not shown) so as to be movable in a predetermined distance range in the loading direction of the tray 1.
[0053]
The guide pin 31c of the clamp slider 31 is moved from the position shown in FIGS. 12 and 14 to the position shown in FIG. Until the guide pin 42a of the arm 42 reaches the arm rotation end position shown in FIG. 13, the guide pin 38a of the clamp slider 31 is not guided in the tray loading direction, and the clamp slider 31 does not move.
[0054]
The slider 39 continues to slide in the same direction after the guide pin 42a of the arm 42 reaches the arm rotation end position shown in FIG. As shown in FIG. 15, the movement of the slider 39 after the end of the rotation of the arm guides the guide pin 31c of the clamp slider 31 in the tray discharge direction, whereby the clamp slider 31 moves in the same direction. .
[0055]
Due to the movement of the clamp slider 31 in the tray discharge direction, the clamper holder 9 is lowered, and the guide pin 9d of the clamper holder 9 is provided with a cam groove 31a provided in the clamp slider 31 as shown in FIG. The disc is clamped by being guided to the lowest position.
[0056]
In FIG. 15, reference numeral 47 denotes a switch for detecting the position of the slider 39. The switch 47 is pressed by the slider 39 when the position of the slider 39 reaches the tray discharge completion position when the tray is discharged and when the position of the slider 39 reaches the disk clamp completion position when the disk is loaded. Each state is electrically detected by tilting in opposite directions.
[0057]
Next, the skew adjustment mechanism of the disk motor will be described with reference to FIGS.
[0058]
In FIG. 16, reference numeral 61 denotes a motor base to which a disk motor 62 is fixed, and 4 denotes a substrate on which the motor base 61, an optical pickup feeding mechanism and the like are supported. The motor base 61 is mounted on the substrate 4 by a plurality of screws 64 via a coil spring 63. A skew adjustment mechanism for the disk motor 62 is provided at the motor base mounting position of the substrate 4.
[0059]
The skew adjustment mechanism includes two pendulum swing receiving seats 65 and 66 for tangential skew adjustment, two guide pins 67 and 68, an eccentric pin 69, and a helical cam 70 for radial skew adjustment. .
[0060]
The motor base 61 has contact seat receivers 71 and 72 that contact the respective pendulum swing receiving seats 65 and 66, and a motor base positioning notch 73 into which the guide pins 67 and 68 are inserted. 74, an eccentric pin engaging hole 75 into which the eccentric pin 69 is inserted, and a cam contact portion 76 that contacts the spiral cam 70 are provided.
[0061]
First, details of the tangential skew adjustment will be described with reference to FIG.
[0062]
As shown in the figure, the cross-sectional shapes of the two pendulum swing receiving seats 65 and 66 have an arc shape centered on the focal point P of the beam light of the optical pickup on the disk surface. The movement of the motor base 61 on the pendulum swing receiving seats 65 and 66 is limited only in the Y-axis direction in the figure by the guide pins 67 and 68 and the notches 73 and 74.
[0063]
Therefore, the motor base 61 in the Y-axis direction of the motor base 61 on the pendulum swing receiving seats 65 and 66 is elastically pressed from above with the coil spring 63 and the screw 64 on the substrate 4. By changing the position, as shown in FIGS. 17B and 17C, the motor base 61 swings the pendulum around the beam focus, and therefore, the tangential skew can be reduced without causing a normal deviation. Adjustments can be made.
[0064]
The position of the motor base 61 in the Y-axis direction on the pendulum swing receiving seats 65 and 66 is adjusted by the eccentric pin 69 from the back side of the substrate 4.Operation partThis is done by rotating 69a with a screwdriver.
[0065]
Next, radial skew adjustment is performed. This radial skew adjustment will be described with reference to FIG. The spiral cam 70 is provided on the substrate 4 at a position on the normal line of the disk, for example. The height of the end of the motor base 61 can be adjusted by the rotational position of the spiral cam 70.
[0066]
Therefore, when the end of the motor base 61 is raised and lowered while the motor base 61 is elastically pressed against the substrate 4 by the coil spring 63 and the screw 64 from above, the entire motor base swings each pendulum. The blade moves with the contact position with the receiving seats 65 and 66 as a fulcrum P. As a result, the radial skew can be adjusted without causing a normal shift. The inclination posture of the motor base 61 is such that the spiral cam 70 is inclined from the back side of the substrate 4.Operation partThis is done by rotating 70a using a screwdriver.
[0067]
In the present embodiment, the motor base 61 is elastically pressed from above with the coil spring 63 and the screw 64 against the substrate 4, thereby rattling between the motor base 61 and the substrate 4. Can be prevented.
[0068]
In the above-described embodiment, a downward biasing force is applied to the motor base 61 by the coil spring 63 and the screw 64 from three points near the pendulum swing receiving seats 65 and 66 and the vicinity of the spiral cam 70. As shown in FIG. 19, when the eccentric pin 69 is in contact with the left wall surface of the eccentric pin engaging hole 75, the coil spring 63 in the vicinity of the left pendulum swing receiving seat 65 is arranged. Since the eccentric pin 69 receives the rightward biasing force generated in the motor base 61 by the force, in this case, a coil spring and a screw are provided near the pendulum swing receiving seat 66 on the right side of the motor base 61. There is no need to stop at. Similarly, as shown in FIG. 20, when the eccentric pin 69 is in contact with the right wall surface of the eccentric pin engaging hole 75, the vicinity of the left pendulum swing receiving seat 65 of the motor base 61 is coiled.・ It is not necessary to stop with a spring and screw.
[0069]
The motor base movable bearing device shares a pendulum swinging bearing surface orthogonal to the rotation axis of the motor, and has two bearing seats (first and second) arranged separately on the left and right of the motor rotation shaft on the substrate. And a single support seat (third support seat) arranged on a line that connects the two support seats on the substrate and a line that passes through the motor rotation axis. The base is stably supported on the substrate by three-point support by these three support seats. The motor base is held on the substrate via the three support seats by biasing means for pressing the motor base against the substrate. The biasing holding device includes a first coil spring that presses a position in the vicinity of the third support seat, and a pendulum swing support surface that passes through the first and second support seats, opposite to the first coil spring. And a second coil spring that presses at least a position in the vicinity of one of the first and second support seats. By placing the pressing points by the biasing holding device in the relationship as described above, the motor base is supported by the motor base movable support device.
[0070]
Each of the first and second support seats is formed with an inner cycloid surface having the same dimension as shown in FIG. 21, which shares the pendulum swing support surface.
[0071]
Due to the shape of the inner cycloid surface, when radial skew correction is performed, the first and second support seats of the motor base and the motor base are formed on the first and second support seats, respectively. The blade motion can be performed with a line connecting the contact points of the first and second contact portions as an axis.
[0072]
When the optical axis of the pickup is not perpendicular to the disk surface on the turntable and thus there is a beam tilt, the skew caused by the beam tilt is reflected in the signal read from the disk by the pickup. Therefore, this skew is supported on the motor base movable support device while monitoring the skew amount using a known skew amount calculation circuit disclosed in, for example, Japanese Patent Application Laid-Open No. 7-210888 (USP 5,546,367). By adjusting the attitude of the motor base, the skew amount can be made zero or minimum.
[0073]
FIG. 22 shows a skew amount monitor circuit using such a skew amount calculation circuit 110. In FIG. 22, the reproduction signal accompanied by the skew read by the pickup is applied to the skew amount calculation circuit 110 disclosed in, for example, the above-mentioned JP-A-7-210888 (USP 5,546,367). Each skew amount included in the reproduction signal is calculated by the skew amount calculation circuit 110, and the calculated skew amount is displayed on the skew meter 111. The skew meter 111 is an analog meter having a pointer 111a, and the central portion of the pointer indicating range 111b indicates that the skew amount is zero or minimum. The skew meter 111 may be a normal one having a zero value at the left end, and a digital display meter may be used as the skew meter 111.
[0074]
In a state where the pickup reproduction signal is applied to the skew amount monitor circuit, one of the skew adjustments, for example, a tangential skew adjustment operation is performed so that the meter indication value is minimized. When the meter indication value at the time of this adjustment becomes the minimum, the adjustment operation is finished. Next, the other, that is, in this case, the radial skew adjustment operation is performed so that the meter indication value is further lowered. When the meter indication value at the time of this adjustment becomes the minimum, the adjustment is completed, that is, the entire skew adjustment is completed.
[0075]
Since the disk reproducing apparatus of the present invention has a structure in which the tangential skew adjustment operation and the radial skew adjustment operation can be independently completed as described above, the best skew adjustment result in each adjustment operation. Therefore, it is not necessary to repeat each adjustment operation a plurality of times.
[0076]
The present invention is of course applied to a playback-only player or drive that plays or reads a CD, CD-ROM, DVD, or DVD-ROM individually. It is also possible to apply to a DVD-ROM shared drive. In such a shared player and shared drive, it is advantageous to perform skew adjustment for DVD and DVD-ROM, respectively. That is, DVD and DVD-ROM have an extremely dense track pitch as compared with CD and CD-ROM, and a very strict skew amount rating is required for reproduction or reading. Therefore, in such a shared player and shared drive, if the skew amount adjustment is adjusted only for DVD and DVD-ROM, sufficient skew performance is guaranteed for CD and CD-ROM.
[0077]
Note that the skew in the disk reproducing apparatus is caused by the relative relationship between the disk surface on the turntable and the optical axis of the pickup, that is, the tilt. Skew can also be adjusted by adjusting, that is, adjusting the attitude of the motor base with respect to the substrate. Note that skew adjustment on the motor side is more advantageous than adjustment on the pickup side. In other words, during playback of the disc, the pickup moves in the radial direction along the disc surface, so that it is almost impossible or difficult to adjust the posture with respect to the running support. Since it is supported stationary on the substrate, it is easy to adjust the posture with respect to the substrate.
[0078]
Here, in this embodiment of the disk reproducing device, the operation portions 69a and 70a of the tangential skew adjusting eccentric pin 69 and the radial adjusting inclined cam 70 are provided on the back side of the substrate, respectively. It is possible to easily and easily perform the best skew adjustment in an adjustment process before factory shipment which requires accurate work.
[0079]
Furthermore, for each skew adjustment on the back side of the substrateofSince the operation units 69a and 70a are provided, the operation unit 69 is also provided in the housing that houses the disc reproducing apparatus.69a, 70aBy providing an adjustment jig (adjustment driver) insertion hole on the wall surface of the housing at a portion opposite to, it is easy for a serviceman to perform skew adjustment at a later date.
[0080]
In the above description, the turntable is directly connected to the rotating shaft of the motor, and the motor base on which the motor is mounted is supported on the movable support device so that the skew can be adjusted. However, the motor is separated from the turntable. It is also possible to install and rotate the turntable indirectly via a belt or the like, and the turntable can be rotatably mounted on a member corresponding to the motor base, that is, the turntable base. In this case, the turntable base is supported on the movable bearing device so as to be able to adjust the skew.
[0081]
【The invention's effect】
As described above, according to the present invention,Tangential skew adjustment and radial skew adjustment can be performed accurately and efficiently independently, and skew adjustment can be easily and easily performed in an adjustment process before factory shipment.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a state of a DVD-ROM drive according to an embodiment of the present invention when a tray is ejected.
2 is a perspective view showing a state of the DVD-ROM drive of FIG. 1 at the time of disc clamping.
3 is a plan view of the DVD-ROM drive of FIG. 1 when disc clamping is performed.
4 is a cross-sectional view showing a state in which a disc is clamped on the tray of the DVD-ROM drive of FIG.
FIG. 5 is a plan view of the tray of FIG.
6 is a cross-sectional view showing a state in which the disc is placed on the tray without being locked by the disc drop stopper in the DVD-ROM drive of FIG. 1;
7 is a plan view of the tray of FIG.
FIG. 8 is a view showing another embodiment of the disk drop-off stopper.
9 is a plan view for explaining the operation of the disk drop stopper of FIG. 8;
10 is a cross-sectional view showing a disk clamp mechanism and its operation of the DVD-ROM drive of FIG.
FIG. 11 is a plan view showing a state of a disk drop stopper when a tray is loaded.
FIG. 12 is a plan view showing the state of the tray loading and the disc clamp driving mechanism when the tray is discharged.
FIG. 13 is a plan view showing a state of tray loading and a disk clamp driving mechanism when tray loading is completed.
FIG. 14 is a plan view showing the state of the disc clamp drive mechanism when the tray is ejected.
FIG. 15 is a plan view showing the state of tray loading and disc clamp drive mechanism when disc clamping is completed.
FIG. 16 is an exploded perspective view showing the configuration of the skew adjustment mechanism of the disk motor according to the embodiment of the present invention.
FIG. 17 is a diagram showing details of tangential skew adjustment in the skew adjustment mechanism of FIG. 16;
18 is a diagram showing details of radial skew adjustment in the skew adjustment mechanism of FIG. 16;
FIG. 19 is a diagram showing a usage example of the skew adjustment mechanism of the embodiment.
FIG. 20 is a diagram showing another example of use of the skew adjustment mechanism of the present embodiment.
FIG. 21 is a view showing an example of an inner cycloid surface of the motor base bearing seat;
FIG. 22 is a diagram showing a skew amount monitor circuit using a skew amount calculation circuit;
FIG. 23 is a diagram for explaining a conventional skew adjustment method;
FIG. 24 is a diagram for explaining another conventional skew adjustment method;
[Explanation of symbols]
1 …… Tray
2 ... Mechanical unit
4 …… Board
5 …… Turntable
9 …… Clamper holder
10 ... Clamper
61 …… Motor base
62 …… Disk motor
63 …… Coil spring
64 …… Mounting screw
65, 66 …… Pendulum swing seat
67, 68 …… Guide pins
69 …… Eccentric pin
70 …… Spiral cam
71, 72 …… Abutment seat receiver
73, 74 …… Motor / base positioning notch
75 …… Eccentric pin engagement hole
76 …… Cam contact part
110 …… Skew amount calculation circuit
111 ... Skew meter

Claims (2)

A motor for driving the disk;
A turntable that is directly connected to the rotating shaft of the motor and rotates;
A motor base equipped with the motor;
A substrate to which the motor base is attached;
Provided on the substrate, the motor base is supported so as to be able to swing the pendulum around the trajectory line of the beam spot of the optical pickup that scans the disk placed on the turntable in the radial direction , And a motor base movable support device that supports the beam spot traveling locus line and the disk surface parallel to the orthogonal line on the motor base so as to be capable of blade movement ;
A holding device for holding the motor base on the motor base movable bearing device on,
An eccentric pin that is provided on the substrate and adjusts a pendulum swinging posture around the beam spot traveling locus line of the motor base held on the motor base movable support device;
A spiral cam that is provided on the substrate and that adjusts the blade motion posture of the motor base around the beam spot traveling locus orthogonal line that is held on the motor base movable support device;
The disc reproducing apparatus , wherein the eccentric pin includes an adjustment operation unit exposed on the back side of the substrate, and the spiral cam includes an adjustment operation unit exposed on the back side of the substrate . 2. The disk reproducing apparatus according to claim 1, wherein an insertion hole for inserting an adjusting jig into each of the operation units is provided in a housing that accommodates the disk reproducing apparatus.

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