JPH0266779A - Double-face performing optical disk player - Google Patents

Abstract

PURPOSE:To stabilize regenerative signals on the both surfaces of a disk by composing one guide mechanism to support a carriage of a fixed guide member and the other of the movable guide member, which can be freely pivoted, and making variable the position of the rotation center of a turn table. CONSTITUTION:At the time of the assembling of a disk player, the relative position between a guide member 15 to guide a carriage 17 along the underside of a disk 10 and a turn table 7 is set by moving the turn table 7 whose rotation central position is made variable, after the rotation axis of the turn table 7 is positioned on the extension of the moving locus of radiated light axis emitted to the underside, the position of the guide path of a guide member 14 freely pivotally set around a supporting axis 14a guiding the carriage along the top face of the disk 10 is regulated, and the extension of the moving locus of the radiated light axis emitted on the top face of the disk 10 crosses the rotation axis of the turn table 7. Thus, the orthogonal condition of the extension of the moving locus of the radiated light axis and the disk rotation center can be obtained for the both faces of the disk, and the stable regenerative signals on the both faces of the disk 10 can be obtained.

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, 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, a double-sided optical disc player, 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, has been proposed, for example, in Japanese Patent Application No. 1986. -13071.7.

In this double-sided optical disc player, the guide drive means includes first and second guide and drive means disposed on both sides of the disc to movably support the carriage and to enable the carriage to be engaged and disengaged at a predetermined engagement and disengagement position. a second guide mechanism;
and a transport mechanism that transports the carriage at the predetermined engagement and disengagement position from one of the first and second guide mechanisms to the other of the engagement and disengagement positions.

By the way, in an optical disc player, if the extension line of the movement locus of the optical axis of the irradiation light accompanying the movement of the optical pickup along the disc recording surface is not orthogonal to the disc rotation center, stable reproduction signals cannot be obtained. I can't. In conventional double-sided optical disc players, this orthogonal state is ensured on one side of the disc, but this orthogonal state is not achieved on the other side of the disc, and it is not possible to achieve a stable orthogonal state on both sides of the disc. No playback signal was obtained.

Summary of the Invention The present invention has been made in view of the above points, and what is its purpose? 11-1 A disc player capable of playing both sides of a disc using an optical pickup, which can obtain stable playback signals over both sides of the disc, and which is capable of producing stable playback signals as the optical pickup moves along the recording surface of the disc. It is an object of the present invention to provide a double-sided optical disc player that can quickly perform adjustment work to obtain a state in which the extension line of the movement locus of the optical axis of the irradiation light is perpendicular to the center of rotation of the disc.

The double-sided optical disc player according to the present invention has a guide drive means for guiding and driving a carriage carrying an optical pickup along both recording surfaces of a disc placed on a turntable, or first and second guide mechanisms disposed on both sides to slidably support the carriage and to support the carriage so that it can be engaged and disengaged at a predetermined engagement and disengagement position; a conveyance mechanism that transports the first and second guide mechanisms from an engagement/disengagement position to the other engagement/disengagement position, one of the first and second guide mechanisms being slidable on both ends of the carriage. a movable guide member configured with a pair of fixed guide members abutting the gear ridge, the other of which is pivotable in a plane substantially perpendicular to the rotation center of the turntable, and guides the gear ridge; The present invention is characterized in that it comprises a fixing means for fixing the movable guide member, so that a state in which the extension line of the movement trajectory of the light beam and the center of rotation of the disk are perpendicular to each other on both sides of the disk can be obtained.

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, a player housing (not shown) of the double-sided optical disc player includes a lower chassis 5 and an upper chassis connected by, for example, three leg members 1, 2, and 3. A chassis 6 is provided. In addition,
In the figure, the direction of arrow Y is the front, and the direction of arrow X is the left. Further, arrow Z indicates upward.

As shown in FIGS. 2 and 3, a turntable 7 is provided at the front end of the lower palm 5, and a disc 10
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 200 mm.
It is also possible to play discs 11 and 12 of 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 shrines 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 the front-rear direction (direction of arrow Y and the opposite direction), and to sandwich the disk vertically. 14 and a fixed second guide portion 15 are arranged, and are attached to the upper shear 6 and the lower shear 5, respectively. A carriage ] 7 is provided so as to be freely engageable and detachable from the first and second guide members 1415 . The carriage 17 is an optical pickup consisting of an optical system including an objective lens 18 and a servo drive mechanism that servo-drives the objective lens in two directions: the forward axis direction (focus direction) and the direction perpendicular to this direction (tracking direction). It carries Details of the structure of this carriage 17 will be described later.

Note that the optical pickup emits light that irradiates the recording surface of the 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 30 are arranged parallel to the first guide member 14 and the second guide member 15 and vertically sandwiching the disk 9 between them. The gear 27 described above can mesh with both rack members 29 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 approximately in the center, and its free end can move 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. Ru. As is particularly clear from FIG. 5, a pair of front and rear coil springs 36 are provided as bias 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. Further, the two rack members have a claw member 29c that engages with the bracket 32 to restrict its swing range, and the free end of the rack member 29c is moved closer to the gear 27 by a coil spring 39 serving as a bias applying means. Forced.

As shown in FIGS. 2 to 4, the carriage 17 has two rollers 4 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 4] is the second roller on the lower chassis 5.
The upper roller 42 can roll on a linear guide protrusion 43 provided parallel to the guide member 15, and the upper roller 42 is mounted on the upper chassis 6 in parallel with the first guide member 14. It can roll on the rail 44. That is, the roller 4
], 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 for guiding the carriage 17 along the lower recording surface of the disk 10. Collectively called the guidance mechanism.

The rear end portions of the first guide member 14 and the second guide member 15 are formed into a pointed shape, and the carriage 17 can be freely engaged with and detached from the guide member 14 and 15 at the pointed end portion. .

At the rear of each guide member 14, 15, a pointed shaft-shaped holding member 47 is disposed which fits into the carriage 17 detached from each of the indoor members and holds the carriage in place of each of the inner members. Although not shown, means is provided to prevent the carriage 17 fitted into the holding member 47 from falling out from the holding member, and this means holds the carriage 17 together with the holding member 47. It consists of a gripping part.

As shown in FIGS. 2, 4, 6, and 7, the first guide member 14, which is a movable guide member, is attached to the upper chassis 6, which is a fixed support member, via two support shafts 14a and 14b. It is being A support shaft 14a supporting the front end of the first guide member] 4 is fixedly or rotatably attached to the upper shear 6, and the first guide member 14 is pivotable about the support shaft 1-4a. be. Support shaft 1.4
a extends parallel to the center of rotation of the tongue table 7, so that the first guide portion 14 pivots in a plane perpendicular to the center of rotation. After the first guide member] 1. The support shaft 14b for attaching the end to the upper chassis 6 extends in the left-right direction (the direction of arrow X and the opposite direction) to the upper chassis 6, and preferably extends from the other support shaft 14a It is fitted into an elongated hole 6a formed with a curvature around the center. As is particularly clear from FIGS. 6 and 7, the support shaft 14
A longitudinal adjustment part tjA' 14c is connected to the upper end of b by caulking, for example, and between the longitudinal adjustment member and the upper chassis 6, the free end, that is, the rear end of the first guide member 14 is connected to the upper chassis. A spring washer 1.4d is provided as a restraining means which presses towards 6. This spring washer 14d acts as a frictional force applying means for applying a frictional force between the free end of the first guide portion 14 and the upper chassis 6.
be fixed to.

In addition to the spring washer 1.4d described above, various configurations may be used as a means for applying a frictional force between the free end of the first guide portion 14 and the upper chassis 6. If the spring washer 14d is used, it is possible to generate frictional force 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.

Moreover, according to the spring washer 14cl, it is possible to obtain a constant frictional force without variation, contributing to stabilization of product quality.

As shown in FIGS. 3 and 6, the longitudinal adjustment member 14c that sandwiches the spring washer 14d with the upper shear 6 is the first
The guide member 14 is provided extending substantially parallel to the guide member 14, and is connected to the upper chassis 6 via a pin 14e at the center thereof and to the first
It is attached so as to be swingable in a plane parallel to the pivot plane of the guide part 14. The longitudinal adjustment member 14c is connected at its rear end to the first guide member 14 via a support shaft 14b. As shown in FIG. 6, a U-shaped notch 14f is formed at the front end of the longitudinal adjustment member 14c, and a small circular recess 6c is formed in the upper chassis 6 in correspondence with the notch. An eccentric driver 14g shown in FIG. 3 can be inserted into this notch 14f, and an effector 14h provided at the tip of the eccentric driver can fit into the circular recess 6C. That is, by rotating the eccentric drum 14g, the longitudinal adjustment member 14c swings about the pin 14e, which causes the first guide member 14 to be supported at its pivot point against the frictional force of the spring washer 146. It pivots around the axis 14a. That is, the position of the guide path of the first guide mechanism including the first guide member 14 can be adjusted within a plane perpendicular to the center of rotation of the tongue table 7 (shown in FIGS. 3 and 4). With this configuration, the extension line of the movement locus of the optical axis of the irradiation light as the optical pickup moves along the recording surface of the disk can be made to intersect with the center of rotation of the disk with respect to both surfaces of the disk. I can do it. That is, when assembling the disc player,
The turntable 7 is made movable so that the position of its center of rotation is variable, and the relative position of the turntable 7 and the second guide mechanism that guides the carriage 7 along eight surfaces (for example, the bottom surface) of the disk is adjusted. After locating the center of rotation of the turntable 7 on the extension line of the movement locus of the optical axis of the irradiation light emitted toward the eight surfaces by moving the turntable 7, By swinging the longitudinal adjustment member 14C using the eccentric driver 14g, the position of the guide path of the first guide mechanism is adjusted, and the rotation of the turntable is made so that the extension line of the movement trajectory of the optical axis of the irradiation light emitted to the A side of the disk is adjusted. It crosses the axis. In this way, since the extension line of the movement trajectory 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 reproduced 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 installed in order to pivot the first guide member 14 is not necessarily necessary, and the first guide member 14c is not provided with the longitudinal adjustment member 14c.
4 may be brought into direct contact with a predetermined tool to pivot the first guide portion. However, by providing such a lever-like longitudinal adjustment portion +) l' 14 c, the force required to adjust the position of the first guide member 14 is small, and the first guide member 14 can be pivoted with high precision. I can do it. Moreover, as shown in FIG. 6, this longitudinal adjustment member 14c is
Although it is provided to extend parallel to the guide member 14, due to this configuration, the pivot angle of the first guide member 14 corresponding to the swing angle of the longitudinal adjustment member 14c is relatively large, and the first guide member 1 -4 position adjustment can be done quickly.

As shown in FIGS. 1 to 3 and 8, a holding member 47 that fits and holds the carriage 17 that has been separated from the first and second guide mechanisms is a plate-shaped rotating member 5.
0 extending forward (in the direction of arrow Y). The rotating member 50 is rotatably supported by a support shaft 53 that extends forward (in the direction of arrow Y) and is implanted in a mounting plate 52 fixed to the rear end of the lower shear 5 . Further, a half-moon-shaped internal sun gear 55 is attached to the I 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 is provided to rotate along a plane that intersects, in this case, perpendicularly, to the direction in which the carriage 17 is guided by the first guide mechanism and the second guide mechanism described above.

The planetary gear 23 provided on the carriage 17 can mesh with the teeth 55a of the sun gear 55 shown in FIG. 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 carriage 17 is moved from the engagement/disengagement position of one of the above-mentioned first and second guide mechanisms to the engagement/disengagement position of the other by means of the rotary member 50 described above and the detachment regulating member 56 integrally formed with the sun gear 55. A transport mechanism is configured to invert and transport the paper to the desired position. In addition, the pair of rack parts It 2 mentioned above
9 and 30, a sun gear 55, a planetary gear 23 provided on the carriage 17, a gear 27, and a gear transmission mechanism 25.
and 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.

Note that, as is not clear from the above-described configuration, the gripping member 47
is conveyed along a plane that intersects with the guiding directions of the first and second guiding mechanisms described above by the rotation of the rotating member 50. On the other hand, the direction of movement of the gripping member 47 for gripping the carriage 17 carrying the optical pickup and transporting it inverted so as to correspond to both recording surfaces of the disc, and the first gripping member 47 for guiding the carriage when playing the disc. If the guide direction of the second guiding machine and the second guiding machine are made to match the guiding direction of q, the moving stroke of the carriage 17 necessary for this reversal will be added to the moving stroke of the carriage 17 during disc play, and the overall size of the disc player will be increased. Invite. 1, by making the direction of movement of the carriage 17 during reversal intersect with the direction of movement of the carriage 17 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 in [7] above, the carriage 17 moves by itself on each of the pair of rack parts +4' 29 30 by the rotation of the gear 27, and during that time, the carriage 17 is moved between each rack part H by the transport mechanism described in 1. In this configuration, the gear 27 rolling on the rack member is subjected to a reaction force accompanying this rotation from the rack member side. Further, another reaction force accompanying the reversal of the carriage 17 by the transport mechanism including the rotating member 50 is applied to the carriage 17 from the sun gear 55 side via the planetary gear 23. Since the planetary gear 23 meshes with the sun gear 55 when the gear 27 is about to complete its transfer on the rack member, the two reaction forces described above counteract each other at this time, and the carriage 17 is forced to move on the rack member. It is possible that it may move or become unable to move between it and the sun gear 55. As described above, by configuring the rack members 29 and 30 so that they can swing when a predetermined amount of force greater than the biasing force of the coil springs 36 and 39 is applied, these two
An antagonistic state of the two reaction forces is avoided, and the carriage 17 can smoothly transition between each rack member and the transport sIM, =.

As shown in FIG. 8, a holding member 47 for fitting and holding the carriage 17 and alternately engaging and disengaging it from the first and second guide mechanisms described above is attached to the rotating member 50 by a screw 47a. and is removed by a spring washer 47b. The screw 47a is a round hole 50b formed in the rotating member 50.
As a result, the holding member 47 can swing freely around its base end. Also, spring washer 4
Reference numeral 7b has a wavy cross-sectional shape, and imparts a piascus to the holding member 47 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 can be attached or removed on the first and second guide parts or their mounting members in a state that is slightly deviated from the normal position. Even if the carriage 17 is moved between these members, the holding member 47 swings appropriately, and the carriage 17 is guided by the holding member 47 and the first holding member 47.
and the second guide member. In this embodiment, the entire holding member 47 may be swingable, or only the tip portion may be swingable. Further, the tip portion or the entire holding member 47 may be formed of a flexible material. That is, it is sufficient that the holding member 47 absorbs the installation error and that the portion where the carriage 17 is to be guided is bendable and resilient.

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 extending direction of each rack member, and the gear 27 has a rotation axis within a plane that intersects with the extending direction of each rack member. The teeth of the pair of rack members are formed so as to face the reversal range. Because of this configuration, the carriage]
7 between the normal rotation position and the reverse rotation position, the gear 2
7 may be rotated in the same direction. 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 7 and for transmitting electrical signals. As shown in the figure, the wiring means includes five first flexible parts arranged to sandwich the rotating member 50 in a plane perpendicular to the rotation axis;
A carriage 17'' is provided to be deflected in a plane parallel to the rotation axis, and an optical pickup and a motor 24 are provided.
a second flexible section 60 connected to the rotating member 50;
It is made up of a flexible substrate having a connecting part 61 that is fixed to the flexible part 61 to electrically connect the first and second flexible parts.

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.
A first arm member 63 is attached in a cantilevered manner to 50 and slidably holds a second flexible portion 60 at its tip, and a pin 64a is used to wind the first arm member 63 at the tip of the first arm member. A second arm part frame 64 is attached to be swingable between the position and the delivery position and slidably hold the second flexible part 60 at the free end, and the second arm part is attached to the winding part. It consists of a spring member 65 as a biasing means for biasing toward the take 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 the objective lens in the direction of its front axis (focus direction) and in the direction perpendicular to this (tracking direction). a first case 70 containing a built-in servo drive mechanism for servo driving in two directions; a second case 7 that holds the first case and constitutes an optical pickup together with the first case; 7]
It has a supporting member 72 that supports the. Carrying member 72
is slidably engaged with the aforementioned first guide member 14 and second guide member 15 at its left end. Pins 71a and 71b are protruded from both left and right ends of the second case 7, and the pins are slidably and rotatably engaged with elongated holes 72a and 72b formed in the supporting member 72, respectively. There is. 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.
They are formed at right angles to the extension direction of the guide portion 14 and the second guide member 15 and spaced apart in a direction different from the rotation center direction, that is, in the left-right direction. Further, pins 71a and 7]b protruding from the second case 71, which are constituent members 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,
Further, the inclination angle of the turntable 7 with respect to the disk supporting surface, in this case the inclination angle in a plane including the rotation center of the turntable 7, is freely adjustable.

A first moving member 73 is swingably attached to the upper end of the supporting member 72. Specifically, pins 72c and 73a that fit into the supporting member 72 and the first moving member 73
and round holes 72d and 73b are formed, thereby allowing the first moving part moon 73 to swing freely. pin 72c
and 73a extend perpendicularly to the direction of the center of rotation of the turntable 7, that is, in the left-right direction, and therefore, the first moving member 73 swings in a plane that includes the direction of the center of rotation. The first moving part 73 is swingably supported at its center, and has a pair of U's formed at its front end.
The pin 7 of the second case 71 mentioned above is
1a and 71b.

A comb-teeth-shaped portion 73d is formed at the rear end of the first moving portion 1473, and the 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 73 is oscillated, thereby adjusting the height position of the optical pickup including the second gauge 71.

On the other hand, an intermediate member 80 is attached near the left end of the supporting member 72 so as to be movable in the front-rear direction (in the direction of arrow Y and the opposite direction). Specifically, a long hole 80a formed in the intermediate member 80 is slidably engaged with a pair of pins 72e protruding from the support portion 72. A long hole 80b is formed in the front end of the intermediate member 80, extending downward (in the direction of the arrow Z and in the opposite direction).
] This elongated hole 80b is inserted into the pin 71d protruding from the free end.
are slidably engaged. A pin 80c extending downward is provided at the rear end of the intermediate portion 480, and the main surface of the cam member 82 serving as a disk-shaped second moving portion rotatably provided on the lower surface of the supporting member 72. Cam groove 8 formed in
The pin 80C is slidably engaged with the pin 2a. 15th
As is particularly clear from the diagram (a) and the 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 has a final stage gear 83a that meshes with the gear portion.
It is rotated by a motor 84 via a gear transmission mechanism 83 including. Immediately, as the motor 84 rotates, the cam member 82 rotates and the intermediate member 80 reciprocates, which causes the second case 71 to swing around its pins 7], a, and 71b, thereby producing an optical system. The inclination angle of the pickup can be adjusted.

In this embodiment, an intermediate member 80 is interposed between the cam member 82 as the second moving member and the second case 71, but the cam surface of the cam member 82 is connected to the second case 71.
It is also possible to have a structure in which it directly slides into contact with the first pin 71d. 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 gear transmission mechanism 83 and the motor 84 are used to rotate the cam member 82 as the second moving section +.
Drive source is configured. Further, the second driving source, the cam member 82, the intermediate member 80, and the elongated hole 72 of the supporting member 72
a and the pin 7 of the second case 71 that engages with it], a,
71b with optical pickup on turntable 7
The optical pickup is supported so that the optical axis of the irradiated light from the optical pickup is always orthogonal to the recording surface of the disk placed on the turntable 7'' by a support means tiltably supported in a plane including the rotation center of the optical pickup. A tilt servo mechanism is configured to adjust the optical axis of the pickup.

Further, the aforementioned motor 78, worm 77, worm wheel 76, worm 75, and intermediate member 74 constitute a first drive source that applies a driving force to the first moving member 73. Further, this first drive source and the first
A support consisting of a moving member 73, a long hole 72a of a supporting member 72, and pins 71a and 71b of a second case 71 that engage with the long hole 72a, and supports an optical pickup such that its height position can be adjusted freely in the direction of the rotation center of the turntable 7. The mechanism constitutes a height adjusting 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 member 82, intermediate member 80, first drive source, and first moving member 73 are collectively referred to as a 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 to correspond to the inner circumference of the disk.

As shown in FIG. 4, FIG. 11 to FIG.
It has a position adjustment section 4490 provided at the right end of the screen. This position adjustment member 90 is swingably supported by a pin 72g protruding from the rear end of the support member 72. The pin 72g extends in the left-right direction, and therefore the position adjustment member 90 is connected to the first guide member 14 and the second guide member 15.
It is swingable in a plane that intersects the first and second guide paths respectively formed by. 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 390.

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. In addition, as shown in FIGS. 11 and 12, the first moving member 7B described above is pushed downward,
A spring member 94 is provided that forces the second case 71 and the position adjustment member 90 upward (=I).
As shown in FIG. 14, a coil spring 95 is provided that biases the second case 71 in a direction toward the supporting member 72 and the first moving member 73.

Due to this configuration, a total of two sets of longitudinal guide members 15° 43 1.4 are located, one set corresponding to both sides of the disk 10.
44 and the carriage 17 are both set with high precision.

In such a configuration, when assembling the disc player, one of the pair of longitudinal guide members 15, 43 disposed corresponding to, for example, the A side of the disc 10 is attached to the supporting member, which is a component of the carriage 17. At the same time, the position of the position adjusting member 90, which is another member constituting the carriage 17, is adjusted by screwing the screw 90a.
Loosen and adjust the engager 41 on the position adjustment member and the A
The relative position with respect to the other longitudinal guide member 43 on the surface side is set.

Next, the carriage 17 is conveyed to the B side of the disk 10, and the supporting member 7 is placed on one of the pair of longitudinal guide members 14.
At the same time, the position of the free end of the leaf spring 91 is adjusted by the adjusting screw 92, which is the adjusting means, so that the other engaging element 42 provided on the free end and the side B side are engaged with each other. The relative position with respect to other longitudinal guide members 44 is set.

Thus, a total of two sets of longitudinal guide portions 11', one set corresponding to both sides of the disk 10, are provided.
4 and the carriage 17 are both set with high precision, and the angular position of the light beam from the optical pickup and the disc recording surface can be adjusted in the tangential direction on both sides of the disc 10. A suitable angle correction adjustment is made.

Note that since the above-mentioned position adjustment member 90 is arranged at the right end of the support member 72, it is not possible to operate the position adjustment member from the side of the device when performing the above-mentioned angular position adjustment in the tangential direction. The adjustment work is easy.

As shown in FIG. 11 and FIGS. 1 and 4, at the end of the first case 70 containing the optical system, a disc 10 consisting of a light emitting element 100 and a light receiving element 101 and placed on the turntable 7 is mounted. Inclination angle detection means is provided for detecting the phase 't, =J inclination angle between the recording surface and the optical axis of the irradiation light directed toward the recording surface 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
, 1.06 The detection signal emitted from the control unit (CPU)
107, 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 explained with reference to FIG. 17.

By rolling on the gear 27 or the rack member 30, the carriage 17 moves from the inner circumferential side of the disc]0 to the outer circumferential side, and when the performance on the lower recording surface of the disc is finished, the carriage 17 moves further outward. It is moved and separated from the second guide member 1-5 and the linear guide protrusion 43 of the lower chassis 5, and is fitted into the holding part oil 47. At the same time, the planetary gear 23 provided on the carriage 17'' meshes with the teeth of the sun gear 55. As a result, the planetary gear 23 begins to roll within the sun gear 55. Then, the holding member 47
The rotating member 50 carrying the disk rotates, and the carriage 17 is inverted and positioned so as to correspond to the upper recording surface of the disk 10, as shown by the two-dot chain line in FIG. At the same time, the gear 27 meshes with the upper rack member 29, and the carriage 17 is disengaged from the holding member 47 and moved onto the first guide column 14 and the guide rail 44. Thereafter, the disc 10 is rotated in the opposite direction to the direction in which the lower recording surface of the disc 10 was being played, and the playing of the upper recording surface of the disc ]-0 is started.

Incidentally, the reverse movement of the carriage 17 from the position corresponding to the upper recording surface of the disk 10 to the position corresponding to the lower recording surface is performed by following the reverse process to that described above.

Additionally, as shown in FIG. 17, the control unit (CPU) 107
When controlling the conveyance mechanism to convey the carriage 17 between the first and second guide mechanisms, a height adjustment means that includes a motor 78 and adjusts the height position of the optical pickup is activated. is once separated from the disk supporting surface of the turntable 7.

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, that is, at a position close to the disk recording surface, using the above-mentioned height adjustment means, if the optical pickup is inverted to correspond to the 8 sides, this There is a concern that it may come into contact with the 8th surface by getting too close to 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 a 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 sides of the disk supporting surface of the turntable to slidably support the carriage and to support the carriage so that it can be engaged and disengaged at a predetermined engagement and disengagement position; a conveyance mechanism that transports the carriage at the predetermined engagement/disengagement position from one of the first and second guide mechanisms to the other engagement/disengagement position; One is constituted by a pair of fixed guide members that slidably abut on both ends of the carriage, and the other is provided to be pivotable in a plane substantially perpendicular to the rotation center of the turntable. It consists of a movable guide member that guides the movable guide member, and a fixing means that fixes the movable guide member.

Because of this configuration, the extension line of the locus of movement of the optical axis of the irradiation light as the optical pickup moves along the recording surface of the disc and the center of rotation of the disc can be made perpendicular to both sides A and B of the disc. be. That is, when assembling a disc player, the relative position of the turntable and the second guide mechanism that guides the carriage along the eight surfaces (for example, the bottom surface) of the disc is set, and the irradiation light is emitted onto the eight surfaces. After positioning the rotation axis of the turntable on the extension line of the axis's movement trajectory, the position of the guide path of the second guide mechanism is adjusted by pivoting the bipedal movable guide member, and the position of the guide path of the second guide mechanism is adjusted. The extension line of the movement trajectory of the optical axis of the irradiated light is made perpendicular to the rotation center of the turntable. In this way, the state in which the extension line of the movement locus of the optical axis of the light beam 11□J is perpendicular to the center of rotation of the disk is obtained on both sides of the disk, so that stable reproduced signals can always be obtained on both sides of the disk.

In addition, in the double-sided optical disc player according to the present invention, as described in 1., the extension line of the movement locus of the optical axis of the irradiation light accompanying the movement of the optical pickup along the disc recording surface is perpendicular to the disc rotation center. Since this is done by appropriately pivoting the movable guide member that is pivotably provided around its pivot point, the adjustment work can be done extremely quickly. For example, if this movable guide member is attached to the fixed support member that supports it at two points, and the position of the movable guide member with respect to the fixed support member is made variable at both of these two points, Not only will there be only two adjustment points, but there is a risk that the adjusted state of the first point will be disturbed by the force applied when adjusting the second point after adjusting the first point.

However, in the double-sided optical disc player according to the present invention, there is no such concern because the movable guide member is pivotably provided and adjustment only needs to be made at one point at its free end.

[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 the 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. Description of main parts No. 71 5...Lower chassis 6...Upper chassis 7...Turntable 1.0, 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... Gear 29.30... Rack member 41.42... Roller 43... Linear guide protrusion 44... Guide rail 47... Holding member 50...Rotating member 55...Sun gear 56...Separation 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

Claims (3)

[Claims] (1) A double-sided performance optical disc player 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 to perform performances on both sides of the disc. , the guide drive means are arranged on both sides of the disk supporting surface of the turntable, and support the carriage in a slidable manner, and support the carriage so that it can be engaged and disengaged at a predetermined engagement and disengagement position. and a transport mechanism for transporting the carriage at the predetermined engagement/disengagement position from one of the first and second guide mechanisms to the other engagement/disengagement position, the first and one of the second guide mechanisms includes a pair of fixed guide members that slidably abut on both ends of the carriage, and the other is pivotable in a plane substantially perpendicular to the center of rotation of the turntable. 1. A double-sided optical disc player comprising: a movable guide member that is provided to guide the carriage; and a fixing means that fixes the movable guide member. (2) The double-sided optical disc player according to claim 1, wherein the position of the center of rotation of the turntable is variable. (3) Both sides according to claim 1 or 2, characterized in that the pivot point of the movable guide member is arranged at a position corresponding to the inner circumference of the disk placed on the turntable and its vicinity. Playing optical disc player.