JPH0594627A - Pickup moving mechanism in disk player - Google Patents

Abstract

PURPOSE:To accurately and smoothly perform an inverting operation of an optical pickup irrespective of any skew operation of the optical pickup. CONSTITUTION:The subject disk player is specified that one optical pickup 37 is inverted simultaneously with its elevating operation to correspond to the front or back surface of a disk D so as to reproduce both surfaces of the disk D, and as to an inverting mechanism 79 for the optical pickup 37, a supporting shaft 53 supporting invertably the optical pickup 37 is fitted with an inverting gear 80. On the other hand, an inverting rack 81 to be meshed with this inverting gear 80 for the purpose of performing the inverting operation of the optical pickup is fitted via a supporting frame 82 to a lower chassis 4 which works the skew operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc player such as a laser disc, and more particularly to a pickup moving mechanism in a so-called double-sided disc player of an optical disc.

[0002]

2. Description of the Related Art At present, an optical disc player for reproducing an image or the like using an optical disc such as a laser disc as a recording medium is widely used. Generally, in this type of disc player, an optical pickup is opposed to a disc which is rotated at a high speed by a spindle motor, and the optical pickup is moved in the radial direction of the disc so that a signal on a recording track of the disc is read and reproduced. Has been done.

By the way, in a disc used in such a disc player, digital signals are usually recorded on both front and back surfaces thereof, whereas the disc player has an optical pickup which faces one side of the disc. I have it. Therefore, as a method of reproducing both front and back surfaces of a disc by using one optical pickup, for example, after reproducing one side of the disc, the disc is once taken out from the player, and then the disc is turned over and mounted on the player to reproduce the other side. Recently, an optical disc player of a so-called double-sided playing system, in which the optical pickup is reversely moved to the opposite side of the disc to reproduce another one side when the reproduction of one side of the disc is completed, is recently performed. For example, the actual Kaihei No. 2-5155 and the actual Kaihei 2
It is proposed in Japanese Patent No. 5158.

[0004]

However, in the double-sided performance type optical disc player as described above,
In order to adjust the optical axis of a so-called optical pickup so as to be orthogonal to the disk surface according to the flexure of the disk, the feed axis (guide shaft) of the optical pickup is movably adjusted to perform skew operation of the optical pickup. Is not suggested. For this reason, conventionally, the skew adjusting mechanism by the feed shaft of the optical pickup is used only in the single-sided playing machine.

For this reason, in the above-mentioned double-sided playing type optical disc player, since the reversing mechanism of the optical pickup is embodied on the side of the fixing means, the optical pickup is turned over after one side of the disc is played by the optical pickup. During operation, depending on the skew operation position of the optical pickup, misalignment occurs between the optical pickup and the reversing mechanism, causing the gear on the optical pickup side to disengage from the gear on the reversing mechanism side, or from the original meshing position. Therefore, there is a problem that the optical pickup cannot be inverted, and the inversion cannot be performed in an accurate posture.

Further, in the above-mentioned double-sided performance type optical disk player, since the reversing mechanism is a rotational movement that draws an arc, the reversing operation distance of the optical pickup is long, and therefore the movement from one side of the disc to the other side. There was also a problem that it took time.

The present invention has been made to solve the above-mentioned problems, and a pickup movement in a disc player capable of accurately and smoothly performing the reversing operation of the optical pickup regardless of the skew operation of the optical pickup. The purpose is to get a mechanism.

[0008]

In order to achieve the above object, a pickup moving mechanism in a disc player according to the present invention comprises a parallel upper chassis and a lower chassis corresponding to both front and back surfaces of an optical disc, and upper and lower chassis thereof. And a self-propelled carriage that meshes with racks provided on the upper chassis and the lower chassis in the inner and outer peripheral directions of the optical disc, respectively, and a carriage in a direction orthogonal to the moving direction. An optical pickup that is supported in a reversible manner about an axis and that is moved along guide shafts that are supported on the upper and lower chassis in parallel with the rack in the inner and outer peripheral directions of the optical disk, and the upper chassis and lower chassis are interlocked. Tilt mechanism to tilt the optical pickup to skew the optical pickup, and the optical pickup In addition, a pickup elevating mechanism that linearly moves the carriage up and down along the chassis between the lower chassis and the upper chassis, and a reversing mechanism that reverses the optical pickup as the carriage moves up and down are provided. A disc player capable of performing double-sided reproduction of an optical disc by moving and reversing so as to correspond to the front and back of the disc, and the reversing mechanism includes a reversing gear attached to a support shaft supporting an optical pickup in a reversible manner. , A reversing rack mounted on a lower chassis that performs a skewing operation, in which a reversing gear meshes, and a reversing rack that performs an inverting operation of an optical pickup.

[0009]

The pickup moving mechanism in the disk player constructed as described above is located on the lower chassis side, and the optical pickup is moved along the guide axis by the self-propelled carriage on the rack while reproducing the back surface of the disk. When the reproduction of the back surface of the disc by the optical pickup is completed, the optical pickup moves to the pickup lifting mechanism together with the carriage. Here, the motor of the pickup lifting mechanism is driven to linearly move the lifting member upward through the drive gear. During the upward movement of the elevating member, the reversing gear of the reversing mechanism meshes with the reversing rack and is rotated so that the optical pickup is reversed and reaches the upper chassis. The optical pickup moves from the pickup lifting mechanism to the guide shaft of the upper chassis so that the surface of the disc can be reproduced.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a partially cutaway perspective view of the entire pickup moving mechanism according to the present invention, FIG. 2 is a side sectional view of the pickup moving mechanism, and FIG. 3 is a broken perspective view of the pickup moving mechanism when the pickup is reversed. FIG. 3 is a schematic plan view of the entire disc player.

In each drawing, a pickup moving mechanism generally designated by reference numeral 1 is arranged at a position facing the disc insertion opening 3 in the disc player casing 2 shown in FIG. Further, in the pickup moving mechanism 1, the lower chassis 4 facing each other at a predetermined interval in the vertical direction.
Further, the upper chassis 5 and the rear chassis 6 located on the rear end side of the lower chassis 4, that is, on the side opposite to the disc insertion opening 3, are arranged in a substantially U-shape. Hereinafter, details of the upper and lower chassis 4, 5 and the rear chassis 6 will be described.

A rear chassis 6 is integrally bent and erected from the end of the lower chassis 4, and a shaft pin 7 horizontally protruding from the upper chassis 5 is inserted into an upper portion of the rear chassis 6. It is supported. On the other hand, the lower chassis 4 is swingably supported by a support shaft 9 on a fixed chassis 8 fixed to the disc player housing 2 on the front side in the vicinity of a turntable of the disc described later. The support shaft 9 is used for the lower chassis 4 and the upper chassis 5.
Is a fulcrum axis for tilt adjustment, so-called skew adjustment.

The support shaft 9 is supported by bearing pieces 10 and 10 bent and raised from the lower chassis 4, and one end of the support shaft 9 is supported by a bearing plate 11 bent and raised from the fixed chassis 8 to support the bearing. A coil spring 12 is interposed between the piece 10 and the bearing plate 11. The other end of the support shaft 9 is supported by one end of the first movable bearing plate 13 as shown in FIG. In the first movable bearing plate 13, a long hole 13a formed in the middle thereof is supported by the fixed chassis 8 and the shaft 14,
An adjusting screw 15 is inserted into the other end of the first movable bearing plate 13, and the threaded portion is screwed into the fixed chassis 8. The other end of the first movable bearing plate 13 is biased upward by a coil spring 16. As a result, when the adjusting screw 15 is rotated by a tool such as a screwdriver, the adjusting screw 15 moves up and down, so that the first movable bearing plate 13 swings about the shaft 14 as a fulcrum, and the lower chassis 4 with respect to the fixed chassis 8 is moved. The tangential direction of is adjusted.

On the other hand, the upper chassis 5 has a support shaft 1 mounted on a base plate 17 whose front end covers the upper chassis 5 from above.
It is supported by 8. The base plate 17 is screwed at its rear end to a fixed support plate 19 which is erected from the fixed chassis 8 to the rear of the rear chassis 6 with a space therebetween. Further, the base plate 17 has a side plate (not shown) whose side plate is not shown. It is screwed to. The base plate 17 is formed with a vertical slit hole 19a into which the shaft pin 7 protruding from the upper chassis 5 is inserted. Support shaft 18
Is the bearing pieces 20, 20 bent and raised from the upper chassis 5.
And one end of the support shaft 18 is supported by the bearing plate 17a bent and raised from the base plate 17, and the other end is supported by one end of the second movable bearing plate 21 as shown in FIG. ing. The other end of the second movable bearing plate 21 is rotatably supported by the base plate 17 by a shaft 22.
Then, the adjusting screw 23 is inserted into the flange 21a provided on the second movable bearing plate 21, and the threaded portion of the screw 23 is screwed into the flange 17b provided on the base plate 17, so that both flanges 2a
A coil spring 24 is interposed between 1a and 17b. As a result, the adjusting screw 23 is rotated by a tool such as a screwdriver to move up and down with respect to the base plate 17, whereby the second movable bearing plate 21 swings about the shaft 22 as a fulcrum, and the upper chassis 5 relative to the base plate 17 is moved. The tangential direction of is adjusted.

The disk D is rotatably arranged in the space between the upper and lower chassis 4 and 5. That is, a turntable 26 projects from the opening 25 formed in the front end surface of the lower chassis 4 on the lower chassis 4, and is rotated by a spindle motor (not shown) arranged at the lower end of a rotary shaft 27 that drives the turntable 26 to rotate. Driven.
The disk D mounted on the turntable 26 is held from above by the chucking device 29 and rotates at high speed. The insertion and the ejection of the disc D into and from the disc player 2 are performed by placing the disc insertion opening 3 of the player 2 on a tray 30 which can be freely taken in and out. Also, tray 3
At 0, an opening 31 is formed which is opened from a portion corresponding to the turntable 26 to an end portion corresponding to a moving direction of an optical pickup described later with respect to a signal recording surface of the disc D.

Thus, the lower chassis 4 and the upper chassis 5 respectively support guide shafts 32 and 33 for guiding and traveling the optical pickup in the inner and outer peripheral directions of the disk D. Both guide shafts 32 and 33 are arranged to face each other in a vertical position, and the guide shaft 33 of the upper chassis 5 is arranged coaxially with the shaft pin 7 described above. And the guide shaft 3
The tip ends of the reference numerals 2 and 32 are inserted into and fixed to the receiving plates 4a and 5a bent and raised from the upper and lower chassis 4 and 5, respectively, and the guide shafts 32 and 33 are attached to the upper and lower chassis 4 and 5, respectively. It is screwed through the support pieces 34 and 35. Among these, the guide shaft 32 of the lower chassis 4 is screwed on the front side of the turntable 26 by a support piece 36 for regulating the guide shaft.

An optical pickup 37 is arranged along the guide shafts 32 and 33 of the lower chassis 4 and the upper chassis 5 so as to be movable in the inner and outer peripheral directions of the disk D. The optical pickup 37 is mounted on a pickup supporting body 38, and the guide hole 3 provided in the supporting body 38.
9 is inserted into the guide shafts 32 and 33 and slides. When the optical pickup 37 is located on the lower chassis 4 side as shown in FIG. 2, the objective lens 39 and the tilt detector 40 attached to the optical pickup 37 correspond to the back surface of the disc D.

Here, a tilt mechanism for skewing the upper and lower chassis 4, 5 will be described. Between a bearing plate 41 cut and raised from the lower chassis 4 at the rear side of the support shaft 9 that swingably supports the lower chassis 4 and substantially in the center of the fixed chassis 8, and a side plate (not shown) that is integral with the fixed chassis 8. A rotary shaft 43 is supported by the rotary shaft 43, and a cam 44 is fixed to the bearing plate 41 side of the rotary shaft 43. A rotation transmission gear (not shown) is provided at the shaft end of the rotation shaft 43. Each of the rotation transmission gears is rotationally driven by a motor as a drive source via a reduction gear mechanism (not shown).

The operation of the tilt mechanism thus constructed is as follows.
A motor is rotationally driven by a signal from the tilt detection unit 40 to rotate the rotary shaft 43 via a reduction gear mechanism and a rotation transmission gear (not shown). The cam 44 that rotates at the same time as this rotation can push up the back surface of the lower chassis 4. As a result, the lower chassis 4 can perform a skew operation inclining upward with the support shaft 9 as a fulcrum, and accordingly, the upper chassis 5 that is interlocked with the lower chassis 4 and the shaft pin 7 also supports the support shaft 18 with the base plate 17. As a fulcrum, the skewing operation is also performed so as to incline upward, and the skew of the optical pickup 37 with respect to the disk D is adjusted.

On the other hand, the optical pickup 37 is mounted on the disk D.
Self-propelled carriage 49 for driving inward and outward directions
Is provided. The carriage 49 is the lower chassis 4
And the disk D by the rotational driving force of the pinion 52 meshing with the racks 50 and 51 provided in parallel with the guide shafts 32 and 33 on each side of the upper chassis 5.
The optical pickup 37 is moved in the inner and outer peripheral directions. The carriage 49 supports the pickup support 38 rotatably around a support shaft 53 that penetrates through a pinion 52 arranged in the moving direction thereof, that is, in a direction orthogonal to the racks 50 and 51. The rotatable range of the pickup support 38 is set to a 180 ° rotation range between a state where the optical pickup 37 faces upward corresponding to the back surface of the disc and a state where it faces downward corresponding to the disc front surface.

The drive mechanism of the carriage 49 described above is constructed as follows. That is, a motor 55 as a drive source is supported on the carriage 49, and the pinion 52 described above is rotated by driving the motor 55 via a reduction gear (not shown). Therefore, the motor 5
The pickup support 38, which rotates the pinion 52 by driving 5 and moves in the inner and outer peripheral directions of the disk D along the rack 50 or 51, is guided by the guide shafts 32 and 33, and is provided on the pickup support 38. The engaging piece 59 is engaged with the guide plates 60 and 61 provided on the upper and lower racks 50 and 51 of the lower chassis 4 and 5 so as to be stably moved.

Further, the racks 50 and 51 for engaging the pinion 52 of the carriage 49 with each other to move and move the optical pickup are constructed as follows. First, in the rack 50 of the lower chassis 4, the end on the turntable 26 side is supported on the side of the lower chassis 4 by a set screw 62 so as to be slightly vertically movable, and the other end of the rack 50 swings upward and downward. A set screw 63 is movably supported on the side of the lower chassis 4. And this rack 50 is 2
The bulging portions 50a and 50b provided at the locations are biased upward by the leaf springs 64a and 64b supported on the bottom surface of the lower chassis 4, and the rack 50 is attached to the lower chassis 4 on the front side of the turntable 26. The stopper plate 65 serving as a supporting member that is supported prevents the downward escape.

With such a structure, the rack 50 can be swung in a seesaw shape with the stopper plate 65 as a fulcrum. For example, the rack 50 on the set screw 63 side is manually pushed down to engage the pinion 52 with the rack 50. However, the pinion 52 remains engaged at the portion of the rack 50 located on the stopper plate 65.

On the other hand, the rack 51 of the upper chassis 5 has setscrews 66a, 6 on both sides of the rack 51 on the sides of the upper chassis 5, respectively.
It is supported by 6b so that it can move upward and downward,
The rack 51 has bulging portions 51 provided at two front and rear positions.
Leaf springs 67a and 67b supported by the upper chassis 5 at a and 51b are urged downward.

Thus, the pickup moving mechanism 1 according to this embodiment is provided with the pickup lifting mechanism 68 for moving the optical pickup 37 together with the carriage 49 between the lower chassis 4 and the upper chassis 5.

That is, along the rear chassis 6 erected from the lower chassis 4, a lower guide 4 is provided so that its lower end is supported by the lower chassis 4 and its upper end is supported by a flange 6a formed on the rear chassis 6, respectively. ing. An elevating member 70 is supported by the elevating guide shaft 69 so as to be able to move up and down, and two upper and lower engaging pins 71 and 72 are horizontally provided on the elevating member 70 in the same direction as the axial direction of the guide shaft 32. On the other hand, in the carriage 49, engaging holes 73 and 74 are horizontally formed corresponding to the engaging pins 71 and 72,
The carriage 49 is moved up and down by the engagement holes 73 and 74 being inserted into and engaged with the engagement pins 71 and 72.
It is supported by and can be moved up and down.

Further, a rack portion 75 is formed in the vertical direction on the side edge of the elevating member 70, and a drive gear 76 supported by the rear chassis 6 is meshed with the rack portion 75, and the drive gear 76 is also attached to the rear chassis. The worm 78 provided on the output shaft of the motor 77 fixed to the gear 6 is meshed. Therefore, the drive gear 7 is rotated by the rotation of the motor 77.
The raising / lowering member 70 is moved along the raising / lowering guide shaft 69 via 6 to raise / lower the carriage 49 between the lower chassis 4 and the upper chassis 5.

Further, the pickup moving mechanism 1 according to the present example
In the above, there is provided a reversing mechanism 79 for reversing the optical pickup 37 to the postures corresponding to the front and back surfaces of the disc D as the carriage 49 moves up and down.

The reversing mechanism 79 is constructed as follows. That is, at the outer end of the support shaft 53 that penetrates the pinion 52 of the carriage 49, the above-mentioned pickup support 3 is attached.
A reversing gear 80 that rotates integrally with 8 is attached, and a reversing rack 81 is arranged in an intermediate portion between the lower position and the upper position of the carriage 49 corresponding to the reversing gear 80. The reversing rack 81 is attached to a support frame 82 that is fixed and stands up on the lower chassis 4 that is skewed. Further, a pin 83 is provided on the side surface of the reversing gear 80, and a spring 85 is stretched between the pin 83 and the projecting piece 84 extending from the carriage 49. The spring force of the spring 85 allows the pickup support 38 to reliably hold the optical pickup 37 in the upward and downward positions at the lower and upper positions of the carriage 49, respectively.

By the way, as described above, the flexible wiring film 86 inputs and outputs various signals to and from the optical pickup 37 which moves in the inner and outer diameter directions of the disk D along the guide shafts 32 and 33 of the upper and lower chassis 4 and 5. Be seen. The flexible wiring film 86 is formed by printing a conductive foil on a resin film having elasticity and flexibility, and one terminal of the flexible wiring film 86 is electrically connected to the pickup support 38. , The other terminal is the above-mentioned upper chassis 5
Is electrically connected to the connector 87a of the wiring board 87 mounted on the base plate 17 supporting the. The flexible wiring film 86 connected in this way is hooked from the outside with respect to the disk D by the guide rod 89 horizontally provided on the frame 88 that is erected from the lower chassis 4 which is skew-moved in the middle thereof, and is wired to the disk D. It escapes so that the film 86 does not contact. Further, the flexible wiring film 86 has two folds 86a and 86b which are mountain-folded toward the disc D at one end and the other end.
Has been formed. An elastic support piece 90 that supports the flexible wiring film 86 corresponding to the wiring board 87 is extended on the base plate 17 in a substantially horizontal shape.

Next, a series of operations of the pickup moving mechanism in the disc player configured as described above will be described. FIG. 2 shows a state in which the A side of the disc D is being reproduced. In this example, the back side of the disc D is the A side and the front side is the B side. During reproduction of the surface A of the disk D, the carriage 49 is in a state of being moved along the lower chassis 4, and the optical pickup 37 faces upward so as to face the surface A of the disk D. The guide hole 39 of 38 engages the guide shaft 32 with the engaging piece 5
9 is in a state of being engaged with the guide plate 60 and being slidably guided. The pickup lifting mechanism 68 is on standby in the lowered position.

In this state, the disk D held by the turntable 26 and the chucking device 29 is rotated, and the pinion 52 is rotationally moved along the rack 50 by the rotational driving of the motor 55, so that the carriage 49 is moved to the disk D. By moving from the inner side to the outer side, the signal is read by the optical pickup 37 and the A side of the disc D is reproduced. When the reproduction of the surface A of the disk D is completed, the carriage 49 is moved in the outer peripheral direction of the disk D, and eventually the guide hole 39 of the pickup support body 38 comes out of the guide shaft 32, and the engaging piece 59 comes out of the guide plate 60. Immediately before coming off, the engaging pin 7 of the lifting member 70
Engagement holes 73 and 74 of the carriage 49 are inserted into the nozzles 1 and 72. As a result, the optical pickup 37, together with the carriage 49, is transferred to the elevating member 70 at a position outside the outer periphery of the disk D (FIGS. 1 and 8).
(See (a)).

When the optical pickup 37 is supported by the elevating member 70 together with the carriage 49, the rack 50 is moved.
The motor 55 of the pinion 52 that has moved along
Switching to this, the motor 77 of the pickup lifting mechanism 68 is rotationally driven. That is, the worm 78 and the drive gear 76 are rotated by the rotation of the motor 77, and the elevating member 70 is moved upward along the elevating guide shaft 69 via the rack portion 75 meshing with the drive gear 76. Therefore, the optical pickup 37 together with the carriage 49 is lifted to the upper chassis 5 side.

When the carriage 49 moves upward, the reversing mechanism 79 causes the reversing operation of the optical pickup 37. That is, the carriage 49 moves the lifting member 70.
When moving up from the lower position to the upper position by
The reversing gear 80 provided on the carriage 49 meshes with the reversing rack 81. For this reason, the reversing gear 80 moving upward with respect to the reversing rack 81 fixed to the support frame 82 is forcibly rotated (see FIG. 8B). Due to the rotation of the reversing gear 80, the optical pickup 37, together with the pickup support 38 directly connected to the support shaft 53 thereof, is inverted by 180 ° from the upward state corresponding to the A surface of the disk D to the downward state corresponding to the disk B surface. (See FIG. 3 and FIG. 8C).

In this way, when the carriage 49 rises to reach the upper chassis 5 and the optical pickup 37 is reversed, the motor 77 of the elevating mechanism 68 stops. At this time, the pinion 52 of the carriage 49 engages with the rack 51 of the upper chassis 5. Thus, carriage 4
The motor 55 that drives the pinion 52 of 9 is rotationally driven,
When the carriage 49 is moved in the inner circumferential direction of the disk D along the upper chassis 5, the guide hole 39 of the pickup support 38 is engaged with the guide shaft 53, and the engagement piece 59 is engaged with the guide plate 61. The optical pickup 37 travels with the carriage 49 to the innermost peripheral portion, which is the start position of the B surface of the disc D, and the carriage 49 is moved in the outer peripheral direction of the disc as the disc D rotates, and the signal is read by the optical pickup 37. Being a disc B
The face is regenerated.

When the reproduction of the surface of the disc B is completed in this way, the carriage 49 is lowered from the upper chassis 5 to the lower chassis 4 by the elevating mechanism 68 and the optical pickup 37 is inverted again by the reversing mechanism 79 by the reverse operation. It returns to the started position of the lower chassis 4 and waits.

Here, during the reproducing operation of the surface A of the disk D by the optical pickup 37, the flexible wiring film 86 connected to the pickup support 38 is shown in FIG.
As is apparent from the above, the optical pickup 3 is hung on the outer side of the guide rod 89 arranged outside the outer periphery of the disk D and connected to the wiring board 87 on the upper chassis 5.
The flexible wiring film 86 does not come into contact with the disk D during the movement of 7.

As described above, in the pickup moving mechanism in the disc player of the present invention, after the optical pickup 37 reproduces one side of the disc D, the optical pickup 37 moves between the lower chassis 4 and the upper chassis 5 together with the carriage 49. Since the optical pickup 37 is moved up and down linearly by 68 and the reversing mechanism 79 can perform the reversing operation of the optical pickup 37 during the up and down movement, the optical pickup 37 moves from the surface A of the disk D to the position B.
The switching operation to the surface can be performed quickly and reliably.

Further, in the pickup moving mechanism according to this example, the reversing axis of the optical pickup 37, that is,
Since the support shaft 53 for reversibly supporting the optical pickup 37 on the carriage 49 is set in the direction orthogonal to the moving direction of the optical pickup 37, that is, the direction orthogonal to the radial direction of the disc D, the depth of the disc player main body. Can be shortened.

That is, the support shaft 53 is attached to the optical pickup 37.
If the structure is set in the same direction as the moving direction of, the carriage 49 and the reversing mechanism 79 are arranged on the outer side of the rear chassis 6, and the depth dimension of the disc player main body becomes longer accordingly, but in the case of this example. Since the support shaft 53 is set in the direction orthogonal to the moving direction of the optical pickup 37, the carriage 49 and the reversing mechanism 79 are arranged laterally of the optical pickup 37, as is clear from the figure. Therefore, the depth dimension of the disc player body can be shortened and the device can be downsized.

Further, in the pickup moving mechanism according to the present invention, particularly as the configuration of the reversing mechanism 79, the support shaft 53 rotating integrally with the pickup support 38 penetrates the pinion 52 of the carriage 49, and the reversing gear is provided at the outer end thereof. 80, and the reversing gear 8 during the lifting and lowering operation of the carriage 49.
The reversing rack 81 for reversing the pickup support 38 together with the optical meshing 37 is attached to the lower chassis 4 that performs the skew operation via the support frame 82. Therefore, the inversion gear is accompanied by the skew operation of the lower chassis 4. The 80 and the reversing rack 81 also move integrally with the movement of the lower chassis 4. For this reason, the reversing gear 80 and the reversing rack 81 are independent of the skew operation of the lower chassis 4 and the upper chassis 5.
As shown in FIG. 6, the distance dimension A between the reversing gear 80 and the reversing rack 81 can be kept constant at all times. Therefore, the reversing gear 80 and the reversing rack 81 may be disengaged from each other or the meshing position may be displaced. Therefore, the reversing operation of the optical pickup 37 can be performed accurately and smoothly, and the high-speed reversing operation of the optical pickup can be performed.

The present invention is not limited to the embodiments described above and shown in the drawings, and various modifications can be made without departing from the spirit of the invention. For example, if the reversing rack 81 of the reversing mechanism 79 is mounted on the upper chassis 5 instead of being mounted on the lower chassis 4, the same effect as described above can be obtained.

[0043]

As described above, according to the present invention, the optical pickup moves up and down linearly between the lower chassis and the upper chassis, and the reversing mechanism causes the optical pickup to reverse during the vertical movement. Therefore, the operation of switching the optical pickup to both the front and back sides of the disk can be performed quickly and reliably.

Further, since the reversing gear of the reversing mechanism for reversing the optical pickup and the reversing rack are attached to at least one of the lower chassis and the upper chassis which perform the skewing operation, the reversing gear and the reversing rack are installed. The inversion of the optical pickup can be performed accurately and smoothly, and the optical pickup can be inverted at high speed without any disengagement or displacement of the engagement position.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a pickup moving mechanism in a disc player according to the present invention.

FIG. 2 is a side sectional view of a pickup moving mechanism according to the present invention.

FIG. 3 is a partially cutaway perspective view of a pickup moving mechanism during a reversing operation of an optical pickup.

FIG. 4 is a schematic plan view of the entire disc player.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is a front view of a tangential skew adjustment unit of the lower chassis.

FIG. 7 is a front view of a tangential skew adjustment unit of the upper chassis.

FIG. 8 is a diagram for explaining the reversing operation of the optical pickup.

[Explanation of symbols]

 1 pickup moving mechanism 2 disk player housing 4 lower chassis 5 upper chassis 6 rear chassis 8 fixed chassis 9 support shaft 13 first movable bearing plate 15 adjustment screw 17 base plate 18 support shaft 21 second movable bearing plate 26 turntable 28 spindle motor 29 chucking device 30 tray 31 opening 32, 33 guide shaft 36 support piece for guide shaft regulation 37 optical pickup 38 pickup support 39 guide hole 40 tilt detector 43 rotation shaft 44 cam 49 carriage 50, 51 rack 52 pinion 53 support shaft 55 motor 59 engaging piece 60, 61 guide plate 64a, 64b leaf spring 65 stopper plate 67a, 67b leaf spring 68 pickup lifting mechanism 69 lifting guide shaft 70 lifting member 71, 72 engaging pin 73, 4 engaging hole 75 rack portion 76 drive gear 77 motor 79 reversing mechanism 80 reversing gear 81 reversing rack 85 spring 86 flexible wiring film 86a, 86b folded habit 87 wiring board 89 guide rod D Disk

Claims (1)

[Claims] 1. A parallel upper chassis and a lower chassis corresponding to both front and back surfaces of an optical disc, a rear chassis connecting the upper chassis and the lower chassis, and inner and outer peripheries of the optical disc on the upper chassis and the lower chassis. Self-propelled carriages that mesh with and transport racks provided in the respective directions, and are supported by the carriages so as to be reversible about an axis in a direction orthogonal to the moving direction, and are parallel to the racks on the upper and lower chassis. An optical pickup that is moved along guide shafts that are respectively supported in the inner and outer peripheral directions of the optical disc; a tilt mechanism that tilts the upper chassis and the lower chassis in an interlocking manner to perform a skew operation of the optical pickup; Along with the optical pickup, move the carriage along the rear chassis and A pickup elevating mechanism for linearly moving up and down between the chassis and a reversing mechanism for reversing the optical pickup as the carriage moves up and down are provided so that one optical pickup corresponds to the front and back surfaces of the optical disc. A disc player capable of moving and reversing the optical disc to perform double-sided reproduction of an optical disc, wherein the reversing mechanism includes a reversing gear attached to a support shaft that supports the optical pickup in a reversible manner, and a lower portion that performs the skew operation. A pickup moving mechanism in a disc player, comprising: a reversing rack mounted on at least one of a chassis and an upper chassis, the reversing gear meshing with the reversing rack for reversing the optical pickup.