JPH0266730A - Double-sided performance optical disk player - Google Patents

Abstract

PURPOSE:To smoothly execute the double surface performance of a disk by controlling a pickup driving means so as to separate an optical pickup from a disk holding surface once when a control means to control the conveying and driving mechanism controls the conveying mechanism to convey a carriage between first and second guiding mechanisms. CONSTITUTION:The guiding driving means of a disk player is arranged at the disk holding surface upper lower both sides of a turn table 7, and at the prescribed engaging and detaching position, a carriage 17 is engaged/detached and first and second guiding members 14 and 15 to hold are arranged. The carriage 17 at a prescribed engaging detaching position is conveyed from one side engaging/detaching position to other side engaging/detaching position out of members 14 and 15 by the conveying mechanism and the carriage 17 is moved by the conveying mechanism with a driving means on the members 14 and 15. The pickup driving means is controlled so as to separate an optical pickup from a disk holding surface once and the double-sided performance of disks 10 to 12 is made smooth.

Description

[Detailed description of the invention] Technical field The present invention relates to a double-sided optical disc player.

Background Art Two optical pickups are provided to correspond to the front and back image recording surfaces of an optical disc (hereinafter simply referred to as a disc) placed on a turntable, thereby making it possible to play both sides of the disc without performing an eject operation. A double-sided optical disc player is known. Such double-sided optical disc players use two expensive optical pickups, resulting in high costs.

Therefore, for example, a double-sided optical disc player is proposed in which a carriage carrying an optical pickup is guided and driven by a guide drive means along both recording surfaces of a disc placed on a turntable. Proposed.

△ In this double-sided optical disc player, the guide drive means are disposed on both the upper and lower sides of the disc to movably support the carriage, and to support the carriage so that it can be engaged and disengaged at a predetermined engagement and disengagement position. the first and second guide mechanisms, and the carriages at the predetermined engagement and disengagement positions are connected to the first and second guide mechanisms;
A conveyor (14) that transports the guide mechanisms from one engagement/disengagement position to the other engagement/disengagement position, and a conveyor (14) that moves the carriage on the first and second guide mechanisms and drives the conveyance mechanism to and a driving means for transporting the carriage.

SUMMARY OF THE INVENTION An object of the present invention is to provide a disc player capable of playing both sides of a disc using a single optical pickup as described above, which can play smoothly even when the disc is extremely warped. To provide a double-sided performance optical disc player capable of performing performances.

In the double-sided optical disc player according to the present invention, a guide driving means for guiding and driving a carriage carrying an optical pickup along both recording surfaces of a disc placed on a turntable includes a disc supporting surface of the turntable. first and second guide mechanisms disposed on both upper and lower sides of the carriage to support the carriage so that the carriage can be engaged and disengaged at a predetermined engagement and disengagement position; a conveying mechanism for transporting the mechanism from one engagement/disengagement position to the other engagement/disengagement position; and the first and second guide machines ++l.
a drive means for moving the carriage on the turntable; and a drive means for driving the conveyance mechanism to convey the carriage, and the height position in the direction of the rotation center of the turntable can be freely adjusted. It has a support mechanism for supporting the optical pickup on the carriage, a pickup driving means for moving the optical pickup and adjusting the height position, and a control means for controlling the transport mechanism and the pickup driving means. and the control means moves the carriage to the first position.
and the second guide mechanism, the pickup driving means is controlled so as to temporarily move the optical pickup away from the disk supporting surface of the turntable when controlling the conveyance mechanism to convey the optical pickup between the disc support surface and the second guide mechanism.

Embodiments Hereinafter, a double-sided performance optical disc player as an embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in FIGS. 1 to 4, the player housing (not shown) of the double-sided optical disc player includes a lower chassis 5 and a lower chassis connected by, for example, three legs 11, 2, and 3. There are 6 chassis. In addition, in the figure, the arrow Y direction is the front, and the arrow X direction is the left. Also, arrow Z indicates ten powers.

As shown in FIGS. 2 and 3, a turntable 7 is provided at the front end of the lower yarn 5, and a disc]0
It is clamped onto the turntable by a clamper 9. The disk 10 shown in FIGS. 1, 3, and 4 has a diameter of about 30 cm, and two circular substrates each having a signal recording layer are bonded together so that each signal recording layer is on the inside. It consists of Furthermore, as shown in Figure 2,
In this disc player, each diameter is approximately 20C.
It is also possible to play discs 11 and ]2 of size 12 cm and 12 cm. The turntable 7 has a centering member that engages with the center hole of each of the disks having the root diameter to center each disk.

A pair of cylindrical movable first guide portions 4 are arranged so as to be parallel to the recording surface of the disk in the radial direction of the disk 10, in this case in the front-rear direction (arrow Y direction and the opposite direction), and to vertically sandwich the disk. 14 and a fixed second guide portion 15 are arranged, and are attached to the upper chassis 6 and the lower chassis 5, respectively. A carriage 17 is provided so as to be detachable from the first and second guide members 14 and 15. The carriage 17 includes an optical system including an objective lens 18 and the objective lens in its optical axis direction (focus direction).
and a servo drive mechanism for servo driving in two directions (tracking direction) perpendicular to this. Details of the structure of this carriage 17 will be described later.

Note that an optical pickup emits irradiated light onto the recording surface of a disk and reads recorded information based on changes in the reflected light.

A planetary gear 23 is provided at the rear end of the carriage 17 and is rotationally driven via a gear transmission mechanism 25 by a motor 24 mounted on the carriage. Note that the motor 24 and gear transmission mechanism 25 are not shown in FIG. Another gear 27 is provided at the left end of the carriage 17, and this gear 27 is also rotationally driven by the motor 24 via the gear transmission mechanism 25. A pair of rack members 29 and 30 are arranged parallel to the first guide member 14 and the second guide member 15 described above and vertically sandwiching the disk 9 between them. The gear 27 mentioned above can mesh with these two rack members and 30.

As shown in FIGS. 1, 2, and 5, the left rack member 30 is connected to a bracket 34 fixed to the lower chassis 5.
It is swingably attached to the top via a pin 35 at approximately the center, and its free end can be moved close to and away from the gear 27 in a direction perpendicular to the moving direction of the optical pickup. Note that claw members 30c are formed on the lower surface near both ends of the rack member 30, and since the claw members engage with the bracket 34, the swinging of the rack member is restricted within a predetermined range. . As is particularly clear from FIG. 5, a pair of front and rear coil springs 36 are provided as a bias applying means for biasing the free end of the rack member 30 in a direction toward the gear 27.

As shown in FIGS. 1 and 4, the right rack member 29
Similarly to the rack member 30 on the left side, it is attached to the bracket 32 via a pin 38 so as to be swingable in a plane perpendicular to the moving direction of the optical pickup. The rack member 29 also has a claw member 29c that engages with the bracket 32 to restrict its swing range, and its free end is biased toward the gear 27 by a coil spring 39 serving as a pie-scar applying means. There is.

As shown in FIGS. 2 to 4, the carriage 17 has two rollers 41 and 42 as engagers at its right end, spaced apart in the vertical direction (in the direction of arrow Z and in the opposite direction). The lower roller 41 is a linear guide protrusion 43 provided on the lower chassis 5 in parallel with the second guide member 15.
The upper roller 42 can roll on the upper chassis 6, and the upper roller 42
It can roll on a guide rail 44 as a movable guide member mounted parallel to the guide member 14. That is, Lola 4
1, the linear guide protrusion 43 provided on the lower chassis 5 acts as a fixed guide member. 1st
The guide member 14 and the guide rail 44 form a first movement path that guides the carriage 17 along the upper recording surface of the disk 10, and these are collectively referred to as a first guide mechanism.

Further, the second guide member 15 and the linear guide protrusion 43 of the lower chassis 5 form a second movement path that guides the carriage 17 along the lower recording surface of the disk O. Collectively referred to as the 2-guidance mechanism.

Each of the rear end portions of the first guide member 14 and the second guide member 15 is formed into a pointed shape, and the carriage 17 can be freely engaged with and disengaged from each of the indoor members 14 and 15 at this pointed end portion. A holding member 47 in the form of a pointed shaft is disposed behind each guide portion 14.1.5 to fit into the carriage 17 detached from each chamber member in place of each chamber inner member and hold the carriage. has been done. Although not shown, means is provided to prevent the carriage 17 fitted into the holding member 47 from falling out of the holding member, and this means holds the carriage 17 together with the holding member 47. It constitutes a gripping shrine.

2. As shown in FIGS. 4, 6, and 7, the first guide part $A' 14, which is the movable guide part) A, is connected to the upper part as a fixed support member via two support shafts 14a and 14b. It is attached to Sharn 6. A support shaft 14a supporting the front end of the first guide member 4 is fixed or rotatably mounted on the upper chassis 6, and
4 is pivotable around this support shaft 14a. The support shaft 14a extends parallel to the rotation center of the turntable 7, so that the first guide portion 14 pivots in a plane perpendicular to the rotation center. The support shaft 14b for attaching the rear end of the first guide shrine to the upper shear 6 is
[preferably the other support shaft extending in the left-right direction (the direction of the arrow X and the opposite direction)], 4 a
It is fitted into a long hole 6a formed with a curvature centered at . As is particularly clear from FIGS. 6 and 7, a longitudinal adjustment portion +g' 14c is coupled to the upper end of the support shaft 14b by caulking, for example, and a groove is provided between the longitudinal adjustment portion and the upper chassis 6. ] A spring washer 14d is provided as a suppressing means for pressing the free end, that is, the rear end, of the guide member 14 toward the upper shear 6. This spring washer 1-4d is connected to the free end of the first guide member 14 and the upper shank 6.
The friction force that causes the frictional force between ("I"j)
The first guide part 14 is fixed to the upper shear 6 by the frictional force.

In addition to the spring washer 14d described above, various configurations may be used as a means for applying a frictional force (=J) between the free end of the first guide portion 14 and the upper chassis 6. If the spring washer 14d is used, the frictional force can be generated with only this spring washer, thereby reducing the number of parts, and since a commercially available one can be used, it is easy to reduce costs.

Further, according to the spring washer 14d, the constant 1
It is possible to obtain vibrational force, which contributes to stabilizing the quality of the product.

As shown in Figures 3 and 6, between the upper Nyasi 6.
-Longitudinal, uJ adjustment member 4 that holds the spring washer 1.4 d.
C is provided to extend substantially parallel to the first guide part 14 (14), and is connected to the upper shaft 6 via a pin 1.4e at the center of the pivot point of the first guide part 14. Moving surface] 2 is provided so as to be able to swing freely in a plane descending to the first guide section 4A' 1.4c. As shown in FIG. 6, a U-shaped notch 14f is formed at the front end of the longitudinal adjustment part 14c. A small circular recess 6c is formed in the eccentric driver 1-4g shown in FIG. In other words, by rotating this eccentric driver 14g, the longitudinal adjustment portion I11.4c swings around the pin 1-4e, and thereby the 1f friction force caused by the spring washer 14G] Against this, the first guide member 14 pivots about its pivot point, the support J'?j axis'1.4a.In other words, the first guide mechanism including the first guide member 14 The position of the guide path can be adjusted in a plane perpendicular to the center of rotation of the turntable 7 (shown in FIGS. 3 and 4). With this configuration, [accompanying the movement of the optical pickup] 3. It is possible to make the extension line of the movement locus of the optical axis of the irradiation light intersect with the rotation center of the disc on both sides of the disc. That is, when assembling the disc player, The turntable 7 is made movable so that its center of rotation is at a different position, and the relative position of the turntable 7 and the second guide mechanism that guides the carriage 17 along the eight surfaces (for example, the bottom surface) of the disk is determined. After setting the rotation center of the turntable 7 by moving the turntable 7 and positioning it on the extension line of the movement locus of the optical axis of the irradiation light emitted toward the eight surfaces, the eccentricity is set as described in 1. By swinging the longitudinal adjustment part 14C with the driver 14g, the position of the guide path of the first guide mechanism is adjusted, and the turntable is rotated so that the extension line of the movement trajectory of the optical axis of the irradiation light emitted to the A side of the disc is adjusted. Cross the axis-C
be. In this way, since the extended line of the movement locus of the optical axis of the irradiation light and the disk rotation center are substantially perpendicular to each other on both sides of the disk, stable re-iteration signals can always be obtained on both sides of the disk.

In this embodiment, the pivot point of the first guide member 14 is arranged at a position corresponding to the inner circumference of the disk placed on the turntable 7 and its vicinity; It may be arranged at a position corresponding to the outer periphery of and its vicinity.

However, by providing the pivot point corresponding to the inner peripheral portion of the disk, the pivot angle of the first guide member 14 with respect to the center of rotation of the turntable can be set with high precision.

Further, the longitudinal adjustment member 14c provided for pivoting the first guide member 14 is not necessarily necessary, and the free end portion of the first guide member 14 is not provided with the longitudinal adjustment member 14c. The first guide shaft may be pivoted by directly abutting the tool. However, such a lever-like longitudinal adjustment part
By providing 4' 14 c, the first guide section 14
The force required to adjust the position of the first guide member 1 is small.
4 can be pivoted with high precision. Further, as shown in FIG. 6, this longitudinal adjustment member 14c is provided extending parallel to the first guide portion 14, and with this configuration, the longitudinal adjustment member 14c is provided with a rotation angle that corresponds to the swing angle of the longitudinal adjustment member 14c. The pivot angle of the first guide member 14 is relatively large, and the first guide member 14 has a relatively large pivot angle.
It is possible to quickly adjust the position of item 4.

As shown in FIGS. 1 to 3 and 8, the holding portion 47 that fits into and holds the carriage 7 detached from the first and second guide mechanisms is a plate-shaped rotating member. 5
0, it is extended forward (in the direction of arrow Y) and taken out. The rotating member 50 is rotatably supported by a support shaft 53 that is implanted in a mounting plate 52 fixed to the rear end of the lower chassis 5 and extending forward (in the direction of arrow Y).

Further, a half-moon-shaped internal sun gear 55 is attached to the mounting plate 52 coaxially with the rotating shaft of the rotating member 50 .

Details of the sun gear 55 are shown in FIGS. 9(a) and 9(b).

Note that the rotating member 50 includes the first guide mechanism and the second guide mechanism described above.
It is provided to rotate along a plane that intersects with the direction in which the carriage 17 is guided by the guide mechanism, in this case, along a plane that is perpendicular to it.

The planetary gear 23 provided on the carriage ] 7 can mesh with the teeth 55 a of the sun gear 55 . However, the planetary gear 23 is inserted into the insertion hole 50a (first
(shown in the figure) and meshes with the sun gear 55. sun gear 5
A flange-shaped disengagement regulating member 56 is integrally provided on the outer periphery of the planetary gear 55 and slides on the front side surface of the planetary gear 23 to prevent the planetary gear from disengaging from the meshing state with the sun gear 55.

The separation regulating member 56 is provided around the central axis of the sun gear 55 within a predetermined angular range. As is particularly clear from FIGS. 9(a) and 9(b), both ends of the withdrawal regulating member are inclined in a direction approaching the tooth portion 55a of the sun gear 55 from one end of the withdrawal regulating member to the other end. A tapered surface 56a is formed. Therefore, the portion where the tapered surface is formed forms a convex portion 56b that protrudes forward (in the direction of the arrow Y) with respect to the other portion of the detachment regulating member. The planetary gear 23, which has meshed with the teeth 55a of the sun gear 55 while rotating, immediately starts to shift along the sun gear, but at the beginning of the shift, it is guided by this tapered surface 56a and moves backward (arrow Y).
direction), and the sun gear 5
It meshes deeply and reliably with the tooth portion 55a of No. 5.

The above-mentioned rotating part 4 (50) and the detachment regulating member 56 formed integrally with the sun gear 55 move the carriage 17 from the engagement/disengagement position of one of the first and second guide mechanisms described above to the engagement/disengagement position of the other. A conveyance mechanism is configured to reverse and convey to the position. Also, the above-mentioned pair of rack members 29 and 30, the sun gear 55, the planetary gear 23 provided on the carriage 17, the gear 27, and the gear transmission mechanism 25 and the motor 24 constitute a driving means for moving the carriage 17 on the first and second guide mechanisms and driving the transport mechanism to reverse the carriage.

In addition, as is clear from the above-mentioned structure, the above-mentioned grip part function 47
is conveyed along a plane perpendicular to the guiding directions of the first and second guiding mechanisms described above by the rotation of the rotating part kA' 50. On the other hand, the carriage carrying the optical pickup] 7 is gripped and placed on both recording surfaces of the disc (gripping member 47 for inverting and conveying
By matching the moving direction of the carriage with the guiding directions of the first and second guiding mechanisms that guide the carriage when playing the disc,
The movement stroke of the carriage necessary for this reversal is added to the movement stroke of the gear ridge 17 during disk performance, resulting in an increase in the size of the disk brake metal body. As described above, by making the direction of movement of the carriage 17 during reversal intersect with the direction of movement of the carriage 7 during disk play, the overall size of the disk player can be reduced.

Here, as mentioned above, the reason why the pair of rack members 29 and 30 is made swingable in a plane perpendicular to the moving direction of the optical pickup will be explained.

As mentioned above, the carriage 1 is rotated by the rotation of the gear 27.
7 is self-propelled on each of the pair of rack members 29, 30, while the carriage 17 is rotated between each rack member by the transport mechanism, or in such a configuration,
The gear 27 rolling on the rack part H
A reaction force accompanying this transfer is applied from the side. In addition, another reaction force due to the reversal of the carriage 7 by the transport mechanism including the rotating portion 450 is applied to the carriage 7 from the sun gear 55 side via the planetary gear 2B. When the gear 27 is about to finish rolling on the rack member, it meshes with the planetary gear 2B or the sun gear 55, so the two reaction forces mentioned above counteract each other at this time, and the carriage [7] It is possible that it may or may not move between and the sun gear 55. As described above, by configuring the rack members 29 and 30 to be able to swing when a predetermined amount of force greater than the ζj force of the coil springs 36 and 39 is applied, these two reactions occur. Antagonism of forces is avoided and the carriage 17 can smoothly transition between each rack member and the transport mechanism.

As shown in FIG. 8, a holding member 47 that fits and holds the carriage 7 and engages and disengages it alternately with the first and second guide mechanisms described above is screwed onto the rotating member 50. 47a and spring washer 47b.
There is a certain amount of play at the end of the holding member 47, which allows the holding member 47 to swing freely around its end. Further, the spring washer 47b has a cross-sectional shape or a wave shape, and the holding member 47
8, a high-asker is attached toward the home position shown by the solid line in FIG.

By making the holding member 47 swingable as described above, the holding member 47 may be attached to the holding portion or the first and second guide portions or its mounting member in a state that is slightly deviated from the normal position. Also, when the carriage 17 attempts to move between these members, the holding member 47 swings appropriately, and the carriage 17 is guided by this and smoothly moves between the holding member and the first and second guide members. Transition. In this embodiment, the entire holding member 47 may be swingable, or only the tip portion may be swingable. Also,
The tip portion or the entire holding member 47 may be made of a flexible material. That is, it is sufficient that the holding member 47 absorbs the mounting error and that the portion of the holding member 47 that is supposed to guide the carriage 7 is bendable and is able to return to its original position and become irradiated.

As is clear from FIGS. 1 and 4, the carriage 17
The gear 27, which is provided in the rack member 47 and can mesh with each of the pair of rack members 29 and 30, has its rotation axis within a plane intersecting the extension direction of each of the rack parts H, and the gear 27 is located within the conveyance range of the holding member 47, that is, the reversal. the pair of racks so as to face the area)
A tooth is formed. Because of this configuration, the gear 27 may rotate in the same direction while the carriage 17 is moved between the normal rotation position and the reverse rotation position. That is, when the optical pickup moves between the normal rotation position and the reverse rotation position where the optical pickup holds the disk, the rotation direction of the gear 27 is constant, and the control circuit for controlling this is simplified.

As shown in FIGS. 1, 3, and 10, wiring means is provided for supplying power to the optical pickup on the carriage 17 and for transmitting electrical signals. As shown in the figure, the wiring means includes a first flexible portion 59 disposed between the rotating member 50 in a plane perpendicular to the rotation axis;
A second flexible part 60 is provided so as to be flexible in a plane parallel to the rotational axis and is connected to the optical pickup and motor 24 on the carriage 17; and a connecting portion 6 for electrically connecting the second flexible portion.

By configuring the wiring means for the optical pickup as described above, the carriage carrying the optical pickup can be moved along each of the image recording surfaces of the disk 10 and reversed to correspond to each of the image recording surfaces. However, the flexible substrate does not twist and does not interfere with the performance of the disc.

A winding and feeding means is provided for winding up and feeding out the second flexible section 60 in accordance with the movement of the carriage 17 along the disk recording surface.

As shown in FIG. 3, the winding and sending means includes a rotating member 5
a first arm part shrine 63 which is attached to the 0 in a cantilever shape and slidably holds the second flexible part 60 at its tip;
A second arm is attached to the tip of the first arm member by a pin 64a so as to be swingable between a winding position and a sending position, and the second arm slidably holds a second flexible part 60 at its free end. It consists of a member 64 and a spring member 65 as a biasing means for biasing the second arm member toward its winding position. The position of the second arm member 64 indicated by a solid line in FIG. 3 is the delivery position, and the position indicated by a two-dot chain line is the winding position.

Next, the structure of the carriage 17 will be explained in detail.

As shown in FIGS. 4, 11 to 14, the carriage 17 includes an optical system including an objective lens 18, and an optical system that moves the objective lens in its optical axis direction (focus direction) and in a direction perpendicular thereto (tracking direction). a first case 70 incorporating a servo drive mechanism for servo driving in two directions; a second case 71 that holds the first case and constitutes an optical pickup together with the first case;
It has a supporting member 72 that supports the. Carrying member 72
is slidably engaged with the first guide part 14 and the second guide member 15 at its left end. Pins 71a and 71b are protruded from both left and right ends of the second case 71, and the pins are slidably and rotatably engaged with elongated holes 72a and 72b formed in the support member 72, respectively. . These two elongated holes 72a and 72b extend in the direction of the rotation center of the turntable 7, that is, in the vertical direction, and are perpendicular to the direction in which the first guide member 14 and the second guide member 15 extend. They are formed apart from each other in a direction different from the center direction, that is, in the left-right direction. Further, pins 71a and 71b protruding from the second case 71, which is a component part of the optical pickup, extend parallel to the disk supporting surface of the turntable 7. With this configuration, the optical pickup can freely adjust the height position in the direction of the rotation center of the turntable 7 with respect to the support member 72, and the inclination angle of the turntable 7 with respect to the disk support surface, in this case, the turntable 7. The inclination angle in a plane including the center of rotation is freely adjustable.

A first moving member 73 is swingably attached to the upper end of the supporting member 72. Specifically, pins 72c and 73 are fitted into the supporting member 72 and the first moving member 73.
a and round holes 72d and 73b are formed, thereby allowing the first moving member 73 to swing freely. pin 72
c and 73a extend perpendicularly to the direction of the rotation center of the turntable 7, that is, in the left-right direction, and therefore, the first moving part moon 73 swings in a plane including the direction of the rotation center. The first moving member 73 is swingably supported at its center, and pivots the pins 71a and 71b of the second case 71 through a pair of U-shaped notches 73c formed at its front end. are doing.

A comb-teeth-shaped portion 73d is formed at the rear end portion of the first moving portion 73, and an intermediate member 74 is connected to the comb-teeth-shaped portion. A worm 75 is screwed into this intermediate member 74.

The worm 75 is rotated by a motor 78 via a worm wheel 76 integrated with the worm and a worm 77 meshed with the worm wheel. That is, as the motor 78 rotates, the first moving member 7B is swung, thereby adjusting the height of the optical pickup including the second case 71.

On the other hand, an intermediate member 80 is attached to the vicinity of the left end of the support portion 72 so as to be movable in the front-rear direction (direction of arrow Y and the opposite direction thereof). Specifically, a long hole 80a formed in the intermediate member 80 is slidably engaged with a pair of pins 72e protruding from the support member 72. A long hole 80b is formed in the front end of the intermediate member 80, extending in the vertical direction (arrow Z direction and the opposite direction).
This elongated hole 80b is slidably engaged with a pin 71d protruding from the free end of the second case 71, which is a component of the optical pickup. A pin 80c extending downward is provided at the rear end of the intermediate portion 80, and the main portion of the cam member 82 serving as a disc-shaped second movable portion is rotatably provided on the lower surface of the supporting portion portion 72. The pin 80c is slidably engaged with a cam groove 82a formed on the surface. Figure 15 (a
) and curve, the cam groove 82a is formed in an annular shape, and therefore its cam surface is endless. A gear portion 82b is formed on the outer periphery of the cam member 82, and the cam member 82 is rotated by a motor 84 via a float transmission mechanism 813 including a final stage gear 83a meshing with the gear portion. That is, as the motor 84 rotates, the cam member 82 rotates and the intermediate portion +A80 reciprocates, thereby causing the second case 71 or its pin 71. By swinging around a 71b, the tilt angle of the optical pickup can be adjusted.

In this embodiment, the intermediate member 80 is interposed between the cam member 82 serving as the second moving part and the second case 7, or the cam surface of the cam member 82 is connected to the second case 7.
1 pin 71. It is also possible to have a structure in which it is brought into direct sliding contact with d. However, in this case, it is preferable that the cam member 82 is provided so that its center of rotation is perpendicular to the tilting surface of the optical pickup.

The above-mentioned gear transmission mechanism 83 and motor 84 constitute a second drive source that rotates the cam member 82 serving as the second movable portion. Further, the second drive source, the cam member 82, the intermediate portion 80, and the elongated hole 72a of the support portion 72
and the pins 71a, 71 of the second case 7 that engages therewith.
b, which supports the optical pickup so as to be tiltable in a plane including the center of rotation of the turntable 7, allows the recording surface of the disk placed on the turntable 7 to be connected to the irradiated light from the optical pickup. A tilt servo mechanism is configured to adjust the optical axis of the optical pickup so that the optical axis is always orthogonal.

Furthermore, the above-mentioned motor 78, worm 77, worm wheel 76, worm 75, and intermediate member 74 constitute a first driving source that applies a driving force (=I j ) to the first moving part 73. The optical pickup is made up of the first driving source, the first moving part 73, the elongated hole 72a of the supporting member 72, and the pin 71a71b of the second case 71 that engages with the elongated hole 72a of the supporting member 72. The support mechanism supported in a height-adjustable manner in the direction of the rotation center constitutes a height adjustment means for adjusting the height position of the optical pickup in the direction of the rotation center of the turntable 7.

Note that the above-described second drive source, cam portion +182, intermediate member 80, first drive source, and first moving member 73 are collectively referred to as pickup drive means. The optical pickup is disposed on the carriage 17 at a position closer to the turntable 7 than the pickup driving means. Therefore, even if the disk placed on the turntable 7 has a small diameter, it is easy to move the optical pickup so as to correspond to the inner circumference of the disk.

FIG. 4 As shown in FIGS. 11 to 14, the carriage 17 has a support part 72 which is a component part of the carriage.
It has a position adjustment member 90 provided at the right end portion of.

This position adjustment member 90 is swingably supported by a pin 72g protruding from the rear end of the support member 72. pin 7
2g extends in the left-right direction, and therefore, the position adjustment member 90 is swingable in a plane intersecting the first and second guide paths formed by the first guide member 14 and the second guide member 15, respectively. be. Note that the position adjustment member 90 and the support member 72 are coupled to each other by two screws 90a shown in FIG.

However, this screw 90a is screwed into the support member 72 and inserted into long holes 90b and 90C formed in the position adjustment member 90, and by loosening the screw, the position adjustment member 90 can be swung.

Of the rollers 41 and 42 as the aforementioned engagers, the lower roller 41 is provided at the free end of the position adjustment member 90. The other roller 42 is provided at the free end of a leaf spring 91 that is flexibly provided on the position adjustment member 90 in the direction of the swinging force of the position adjustment member. 1st
As shown in FIGS. 1 and 12, an adjusting screw 92 is provided as an adjusting means for adjusting the position of the free end of the leaf spring 91 with respect to the position adjusting member 90.

The head of the adjustment screw 92 abuts against the upper surface of the leaf spring 91, and is screwed into a cut-and-raised portion 90e formed on the position adjustment member 90. Note that, as shown in FIGS. 11 and 12, the first moving member 73 described above is urged downward, and the second
A spring member 94 is provided that biases the case 71 and the position adjustment member 90 upward, respectively. Further, as shown in FIG. 14, a coil spring 95 biases the second case 71 in a direction toward the supporting member 72 and the first moving member 73.
is provided.

Because of this groove bottom, a total of two sets of longitudinal guide members 15°43 are provided, one set each corresponding to both sides of the disk 10.
44 and the carriage] 7 are both set with high precision.

In such FF4 configuration, assembly of the disc player 11. In Ij, a pair of longitudinal guide parts +, l'15.43 arranged corresponding to, for example, the A side of the disk]O.
At the same time, the left end of the supporting member 72, which is a component of the carriage 17, is engaged with one of them 15, and at the same time, the position adjusting member 90, which is another component of the carriage 17, is engaged with the left end of the supporting member 72, which is a component of the carriage 17.
The relative position of the engager 41 on the position adjustment member and the other longitudinal guide member 43 on the side A is set by loosening the screw 90a. Next, move the carriage 17 to the disk 1.
0, the supporting member 72 is engaged with one 14 of a pair of longitudinal guide members 14, 44 arranged corresponding to the 8th surface of the disk 10, and at the same time the leaf spring Adjust the position of the free end of 91 using the adjusting screw 9, which is the adjusting means.
2 to set the relative position of the other engaging element 42 provided on the free end and the other longitudinal guide member 44 on the eighth side.

Thus, a total of two sets of longitudinal guide members 1.5.43°14.44 are provided, one set corresponding to both sides of the disk 10.
The relative positions of the disk 10 and the carriage 17 are both set with high precision, and the angular position of the light beam from the optical pickup and the disk recording surface can be adjusted in the tangential direction on both sides of the disk 10. This allows suitable angle correction adjustments to be made.

Note that since the position adjustment member 90 described in 1 is disposed at the right end of the support member 72, the position adjustment member 90 must be operated from the side of the device when performing the above-mentioned angular position adjustment in the tangential direction. This makes adjustment work easier.

As shown in FIGS. 11 and 14, the end of the first case 70 containing the optical system includes a light emitting element 100 and a light receiving element 101, and a recording surface of the disc 10 placed on the turntable 7. An inclination angle detection means is provided for detecting a relative inclination angle between the optical axis and the optical axis of the irradiation light emitted from the optical pickup.

Although not shown, the double-sided performance optical disc player is provided with various detection means in addition to the tilt angle detection means, and as shown in FIG. 16, each detection means 105
, 106 is sent to the control unit (CPU) 1.
07, and the control unit operates and stops each motor etc. at timings described below in accordance with each detection signal.

Next, the operation of the double-sided performance optical disc player having the above configuration will be briefly described with reference to FIG. 17. (Explained in 1-.

By rolling on the gear 27 or the rack member 30, the carriage 17 moves from the inner circumferential side to the outer circumferential side of the disk 10, and when the playing on the upper recording surface of the disk is finished, the carriage 17 is further moved outward. The second guide member 15 and the linear guide protrusion 43 of the lower chassis 5 are detached from each other, and the second guide member 15 and the lower chassis 5 are separated from each other and fitted into the holding part lug 47 . At the same time, the planetary gear 23 provided on the carriage 17 changes to the sun gear 5.
It meshes with tooth part 5. This causes the planetary gear 23 to start rolling within the sun gear 55. Then, the rotating member 50 carrying the holding portion 47 rotates, and the carriage 7 is inverted and positioned so as to correspond to the upper recording surface of the disk recorder 0, as shown by the two-dot chain line in FIG. . Same 11! j, the gear 27 meshes with the upper rack member 29, and the carriage 17 is disengaged from the holding portion 47 and moved onto the first guide portion 14 and the guide rail 44. Thereafter, the disc is rotated in the opposite direction to the direction in which the lower recording surface of the disc 10 was being played, and the upper recording surface of the disc 0 is started to be played.

Note that the carriage 17 is reversely moved from a position corresponding to the upper recording surface of the disk 10 to a position corresponding to the upper recording surface by following a process reverse to the above.

In addition, as shown in FIG. 17, the control unit (CPU) ] 07 is
When controlling the conveyance mechanism to convey the carriage] 7 between the first and second guide mechanisms, a height adjusting means including a motor 78 for adjusting the height position of the optical pickup is operated to The pickup is once separated from the disk supporting surface of the turntable 7.

On the other hand, at the point when you have finished playing, for example, A on the disc,
If the optical pickup is positioned at its highest position using the above-mentioned height adjustment means, that is, at a position close to the disk recording surface, if the optical pickup is inverted to correspond to the 8 surfaces in this state, There is a concern about getting too close to the 8th side and coming into contact with it. As mentioned above, this problem can be solved by configuring the optical pickup to be once separated from the disk before performing this reversal operation.

Further, the control unit (CPU) 107 operates the tilt servo mechanism including the motor 84 while the disc is being played, so that the disc recording surface and the optical axis of the irradiated light from the optical pickup are always perpendicular to each other.

Effects of the Invention As detailed above, in the double-sided optical disc player according to the present invention, a guide drive means is provided for guiding and driving a carriage carrying an optical pickup along both recording surfaces of a disc placed on a turntable. first and second guide mechanisms disposed on both upper and lower sides of the disk supporting surface of the turntable to support the carriage so that the carriage can be engaged and disengaged at a predetermined engagement and disengagement position; a transport mechanism for transporting the carriage from an engagement/disengagement position of one of the first and second guide mechanisms to an engagement/disengagement position of the other; and a transport mechanism for moving the carriage on the first and second guide mechanisms. a support device (g) that supports the optical pickup on the carriage so that the height position in the direction of the rotation center of the turntable can be freely adjusted; It has a pickup drive means for moving the optical pink-up and adjusting the height position, and a control means for controlling the transport mechanism and the pickup drive means.

In this way, since the optical pickup has a height adjustment means for adjusting the height position in the direction of the rotation center of the turntable, the optical Because the optical pickup is always kept close to the disk recording surface at a constant distance, the light emitted from the optical pickup is focused with high viscosity onto the recording track, resulting in smooth performance. Furthermore, since the height adjusting means is compactly housed in the carriage, it is easy to downsize the player as a whole.

Furthermore, in the double-sided optical disc player according to the present invention, the control means controls a portion of the optical pickup of the turntable when controlling the transport mechanism to transport the carriage between the first and second guide mechanisms. The pickup driving means is controlled so as to move it away from the disk carrying surface.

On the other hand, when you have finished playing, for example, side A of the disc,
If the optical pickup is positioned at its highest position using the above-mentioned height adjustment means, that is, at a position close to the disk recording surface, if the optical pickup is inverted to correspond to the 8 surfaces in this state, There is a concern that it may come into contact with the 8th surface by getting too close to it. As described above, this problem can be solved by configuring the optical pickup to be partially separated from the disk before performing this reversal operation.

[Brief explanation of the drawing]

1 to 4 are respectively a perspective view, a partially sectional plan view, a right side view, and a front view of the internal structure of a double-sided optical disc player according to the present invention, and FIGS. 5 to 15 are
Partial detailed view of the internal structure shown in Figures 4 to 4, Part 1
FIG. 6 is a diagram showing a control system of the double-sided optical disc player, and FIG. 17 is a flowchart for explaining the operation of the double-sided optical disc player. Explanation of symbols of main parts 5...Lower chassis 6 ・Upper chassis 7...Turntable 10.11.12...Disc 14...
First guide member 15...Second guide member 17...Carriage 23...Planetary gear 24.78.84...Motor 25.83... Gear transmission mechanism 27... Gears 29, 30... Rack member 41, . 42... Roller 43... Linear guide protrusion 44... Guide rail 47... Holding member 50... Rotating member 55... Sun gear 56 ... Detachment regulating member 70 ... First case 71 ... Second case 72 ... Carrying member 73 ... First moving member 74.80. ...Intermediate member 82...Cam member (second moving member) 90...
...Position adjustment member 91...Plate spring 92...Adjustment screw 107...Control unit (CPU)

Claims (1)

[Claims] A double-sided performance optical disc player that performs performance on both sides of a disc by driving a carriage carrying an optical pickup along both recording surfaces of a disc placed on a turntable by a guiding drive means, the guide driving means driving a carriage carrying an optical pickup. The driving means includes first and second guide mechanisms disposed on both upper and lower sides of the disk supporting surface of the turntable to support the carriage so that the carriage can be engaged and disengaged at a predetermined engagement and disengagement position, and the drive means is located at the predetermined engagement and disengagement position. a transport mechanism for transporting the carriage from an engagement/disengagement position of one of the first and second guide mechanisms to an engagement/disengagement position of the other; a transport mechanism for moving the carriage on the first and second guide mechanisms; a support mechanism that supports the optical pickup on the carriage so that the height position in the direction of the rotation center of the turntable can be freely adjusted; a pickup drive means for moving the type pickup to adjust the height position; and a control means for controlling the transport mechanism and the drive means, the control means moving the carriage between the first and second guide mechanisms. 2. A double-sided optical disc player, characterized in that when controlling the transport mechanism to transport the disc, the pickup driving means is controlled so as to temporarily move the optical pickup away from the disc carrying surface.