JPS59135670A - Optical disk record reproducing device - Google Patents

Abstract

PURPOSE:To attain miniaturization and high accurate control simply and surely by providing a rack gear along a driving shaft to a section to be supported of a pickup and meshing a worm gear with the rack gear. CONSTITUTION:When the pickup 32 is moved in the arrow C, a motor 58 is driven counter clockwise and a driving gear 57 is driven in the same direction. The driving gear 57 drives clockwise a transmission gear 56 and the worm gear 55 provided coaxially via the transmission gear 56 and a guide rod 54. Since the worm gear 55 is meshed elastically with the rack gear 53 of a pickup fitting base 52, the pickup fitting base 52 is driven linearly in the arrow C attended with the rotation of the worm gear 55. Thus, the pickup fitting base 52 is guided to guide support sections 521, 522 and a clipping section 59 to which a guide rod 54 being the rotating center of the worm gear 55 and the transmission gear 56 is inserted and moved in the arrow C together with the pickup 32. When moving the pickup 32 in the direction of the arrow D, it is moved by reversing the motor 58.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to an improvement of an optical disc record playback device suitable for an optical DAD (digital audio disc) system. [Technical Background of the Invention and Problems thereof] Nearby Nowadays, in the field of audio equipment, digital recording and reproducing systems using PCM (Pulse Coat Modulation) technology are emerging in order to achieve as high fidelity as possible. In other words, this is called digital audio, and the principle is that the audio characteristics are independent of the characteristics of the recording medium and are much superior to the conventional analog system. This is because it has been established. In this case, a system that uses a disk (disk) as a recording medium is called a DAD system, and its reproduction methods include an optical type, an electrostatic type, and a mechanical type. Regardless of which of these playback methods is adopted, the playback device that embodies it must be capable of satisfying various advanced functions and performances not found in conventional playback methods. Ru.

For example, in an optical disc record playback device that uses the CD (compact disc) method among optical playback methods, digital (PCM) is used for transparent resin discs.
12m in diameter and 1.2m thick, coated with a metal thin film that forms bits (irregularities with different reflectances) corresponding to the conversion data.
My optical disc is driven by the CLV (Constant Linear Velocity) method at a variable rotational speed of about 200 to 500 r, p, m. In this case, this disc requires various advanced functions and performance because the track pitch is 1.6 μm and it stores a huge amount of information that can be played in stereo for about an hour on one side. It is easy to understand that.

The next requirement for the above-mentioned optical disc record playback device is that each mechanical part can operate reliably with an organic and simple configuration with no waste, and that it can also be miniaturized while consuming power. Further improvements should be made to implement power-saving measures to reduce the amount of electricity generated.

Incidentally, one of the specific targets of such a request is a disk loading mechanism. In other words, there are two types of disk loading mechanisms: vertical and horizontal.The horizontal type is said to be more advantageous in terms of controllability of the disk drive, but the horizontal type This is because the formula does not achieve high accuracy with the simplest possible configuration.

In this case, it is not just a matter of being able to load the disc horizontally; rather, there are various requirements for the optical disc record playback device as a whole in relation to the disc playback mechanism, including the pickup drive mechanism and the disc drive mechanism. It must be able to correspond to

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and provides an optical disc record playback device that has a simple configuration, can promote downsizing, and can easily and reliably perform high-precision control. The purpose is to

[Summary of the invention]

That is, the present invention provides an optical disc record playback device comprising a pickup feeding mechanism that can freely transport a pickup for playback in the radial direction of an optical disc, wherein the pickup feeding mechanism moves one end of the pickup in the transporting direction. They are installed in the same direction and are supported by a drive shaft with a worm gear fitted in the middle, and a rack gear is provided along the drive shaft on the side of the supported part of the pickup, and the rack gear is connected to the drive shaft. It is characterized by being made by meshing worm gears.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. That is, FIG. 1 shows the external appearance of a CD type optical disc record reproducing apparatus to which the present invention is applied, and 11 is a cabinet. On the front panel of this cabinet II, a DAD (hereinafter referred to as disk) loading mechanism section 12 is installed.
It is provided in a so-called horizontal loading type, which can be moved in and out in the directions of arrows A and B in conjunction with the operation of the ADING) key 13, and the disc is placed horizontally on the tray section for playback. It is carried in and installed approximately horizontally at the drive position, and details will be described later.

Reference numeral 14 in FIG. 1 is a power key that is operated prior to operating the loading key 13. Hereinafter, a display section 15 is disposed on the upper right side of the loading mechanism section 12, and the display section 15 is The lower row contains a play key (PLAY) for play operation, a stop key (5TOP), a next key (NEXT), a fast forward key (F-F) for fast forward operation, and a pack word key (BWD) for punk word operation. ), Bozeky (PA
An operation section 16 having a USE ), a repeat key (nEpEAT5, etc.) is arranged parallel to the loading key 13.

Here, FIG. 2, FIG. 3, and FIG. 4 show the states of the loading mechanism section 12 during, during, and after disk loading, respectively. First, in FIG. 2, the mounting structure 17 has an approximately inverted concave shape to which the loading mechanism section 12 including the beam 2 pumping mechanism 18, the disk playback mechanism section 19, etc. are attached; A substantially rectangular holding tray 20 is disposed so as to be movable in the directions of arrows A and B.

That is, as shown in FIG. 5, this mounting structure 17 is provided with a pair of flange portions 171° 171 for installing the cabinet 1 (see FIG. 1) at both ends thereof.
A substantially concave guide portion 172 is formed at the tip of the upper surface.

The guide portion 172 is provided with a pair of guide rollers 113 and 114 on the inside of both sides thereof, and a loading drive motor 2 is provided near one end of the bottom surface thereof. This motor 2 has a driving gear 22 coaxially provided on its rotating shaft 211.
The first thing is. Second. Third. The fourth and fifth reduction gears 23 to 27 are sequentially meshed.

In fact, a lock gear 28 for locking corresponding to the fifth reduction gear 27 is installed at one end of the base end of the upper surface of the mounting structure 17.

The lock gear 28 has its rotation shaft 28 inserted through both ends of a substantially concave mounting portion 175 formed in the mounting structure 17, and a first eccentric cam for lock driving is provided near each end of the lock gear 28. 29 and a second eccentric cam 3Q for driving the clamper are coaxially provided. Furthermore, the mounting part 1
75 is provided with a rotating shaft 176 substantially parallel to the rotating shaft 281, and the locking member 31 is supported on this rotating shaft 176. This locking member 31 has a lock groove 311 formed at its distal end, and a driving sliding contact portion 312 for slidingly contacting the first eccentric cam 29 at its base end. A spring (not shown in FIG. 5 for convenience) is engaged between the base end portion of the locking member 31 and the mounting portion 175, so that the locking member 31 is biased counterclockwise in the figure.

On the other hand, the second eccentric cam 3o is similar to the first eccentric cam 2.
9, and first and second locking grooves 301 for the clamper lock are provided at the lowest and highest eccentric positions.
, 302 are formed.

Here, the mounting structure 17 has a through hole 177 formed approximately in the center of its upper surface. A pickup 32 and a turntable 34 having a fitting part 341 inserted through the hole of the disk 33 (indicated by the dotted chain line in FIG. 2) are attached to the through hole 177, which will be described later. The playback mechanism section 19 is in the loading direction (arrow A, B direction)
It is arranged at a predetermined angle with respect to the

Further, a pair of support stands 1'18, 17B for supporting the clamper lever are erected on the upper surface of the t-height body 17 at both ends thereof corresponding to the mounting portions 175.

Here, a loading mechanism configured to be attached to the attachment structure 11 configured as described above will be explained. That is, as shown in FIG. 2 again, the tray 2o, on which the disk 33 shown by the two-dot chain line in the figure is mounted, is disposed on the mounting structure 17. A through hole 201 corresponding to the disk 33 is formed approximately in the center of the tray 20.
A plurality of guide grooves 202 (only one location is shown in FIG. 4 for convenience of illustration) are formed at predetermined intervals on the inner circumferential wall of the through hole 201, each slanting downward. And the above-mentioned through hole 2
A rotary plate 35 on which the disk 33 is placed is installed at 01. This rotary disk 35 has the above-mentioned through hole 2θ at its peripheral edge.
A plurality of protrusions 351 (corresponding to a plurality of guide grooves 2θ2)
For the convenience of illustration, only one location in FIG. It is freely rotatable in the direction of the hour hand and can be moved up and down.

Further, in the rotary disk 35, a laser irradiation through hole 352 located in the loading direction (that is, the direction of arrows A and B) before and during disk loading is formed from the center toward the outer circumference. The through holes 352 allow the rotating disc 35 to pass the plurality of protrusions 35 into the plurality of guide grooves 202 as shown in FIG. 4 after the disc is loaded.
The device is guided by the device, rotated counterclockwise in the figure, and lowered, so that it is tilted at a predetermined angle with respect to the loading direction, and the details of its drive system will be described later.

Here, the tray 20 and the rotary plate 35 have a pair of disc loading/unloading recesses 203, 204, and 353 and 354, respectively, so that they face each other before and during disc loading, as shown in FIGS. 2 and 3. It is formed.

Among these, the recesses 353 and 354 of the rotary disk 35
As mentioned above, the rotary plate 35 is connected to the tray 20.
After loading the disc, which has been rotated counterclockwise in the figure, the recess 35 of the tray 20 as shown in FIG.
3,354, respectively.

The tray 20 also has guide members 36 at both ends thereof.
31 are formed extending from one end thereof in correspondence with the guide portions 172 of the mounting structure 17, respectively. In these guide members 36 and 37, guide groove portions 36 (for convenience of illustration, the guide member 37 is not shown) correspond to the guide rollers 173 and 174 of the guide portion 172 of the mounting structure 17, respectively. It is formed as follows. For this reason,
The tray 20 has guide grooves 361 of its guide members 36, 37, and rollers 1 of the guide portion 172 of the mounting structure 17.
It is engaged and guided by 73 and 174 and is movable in the directions of arrows A and B.

Here, a fixed rack 38 and a movable rack 39 for driving loading are stacked on the lower surface of one side of the tray 20, as shown in FIG. 6. That is, the fixed rack 38 is formed on the lower surface of the tray 20 in correspondence with the third reduction gear 25 of the mounting structure 17, and the guide bins 3 are formed on the upper surface at predetermined intervals.
81,382 are provided protrudingly.

On the other hand, guide holes 391 and 392 are formed in the movable rack 39 disposed on the upper surface of the fixed rack 38, and guide bins 381 and 382 of the fixed rack 38 are inserted into the guide holes 391 and 392, respectively. has been done. The movable rack 39 has a first toothed portion 393, the details of which will be described later, formed at its distal end corresponding to the fifth reduction gear 27 of the mounting structure 17, and a second toothed portion 393 formed at its proximal end. A toothed portion 394 is formed corresponding to the lock gear 28. Further, the movable rack 39 has a movable portion 395 formed at its distal end to protrude inward, and a bin 396 is formed at the distal end of the movable portion 395.

One end of the drive member 40 is rotatably supported by the bin 396, and the other end of the drive member 46 is rotatably supported by the bin 355 protruding from the rotating disc 35. .

Further, as shown in FIG. 2 again, the tray 20 has a locking protrusion 4 formed at its base end, and this protrusion 41 has a locking member 311 of the locking member 31 of the mounting structure 17. A lock bin 411 is formed correspondingly.

Here, the loading mechanism section 1 configured as described above is
The second operation will be explained in detail.

That is, when the loading key 13 (see FIG. 1) is operated to mount the disc 33 on the turntable 34 in the state before disc loading (disc mounting position) shown in FIG. 2, the motor 21 is driven and the gear 2
2 is rotated counterclockwise in the figure. This rotational force is then transmitted to the first gear 22 through the gear 22. Second. The third degree is transmitted to the fourth and fifth reduction gears 23 to 27. On this occasion,
Third reduction gear meshed with the base end of the fixed rank 38 @ special ZS
Since the tray 20 is rotationally driven in the counterclockwise direction in the figure, the tray 20 is located most in the direction of arrow B (disk drive position) as shown in FIG.
, and its movement is stopped. Here, this third
The reduction gear 25 is removed from the tip of the fixed rank 38, and at this time, the fifth reduction gear 27, which is further decelerated and driven in the same direction, is moved to the first gear 39 of the movable rack 39.
3, and the lock gear 28 is meshed with the second tooth portion 394 of this movable rack 39. Then, the movable rack 39 marked -h is moved to the position shown in FIG. 8 by L to the fifth reduction gear 27. At this time, the movable rack 39 has its movable portion 395 aligned with the arrow B.
The drive member 40 presses the bin 355 of the rotary plate 35 by being moved in the direction. Therefore, the plurality of protrusions 351 of the rotary plate 35 are connected to the plurality of guide grooves 20 of the tray 20.
2 and is lowered while rotating counterclockwise in the figure. Here, the rotating disk 35 is guided by the through hole 3 for laser irradiation.
52 corresponds to the feeding direction of the pickup 32 (that is, the direction of arrows C and D), which will be described in detail later.On the other hand, the movable rack 39 corresponds to the 9th direction as described above.
When the position shown in the figure reaches the position shown in FIG. 10 and the second tooth portion 394 meshes with the lock gear 28, the lock gear 28 is rotated counterclockwise in the figure. At this time, the first eccentric cam 29 of the lock gear 28 presses the sliding contact portion 312 of the lock member 31 and
1 resists the biasing force of the spring 60 and rotates its rotation axis 1.
It is rotated counterclockwise in the figure around 76. Therefore, as shown in FIG. 11, the locking groove 311 of the locking member 31 in this square locks the locking pin 411 of the locking protrusion 41 of the tray 2.0, and the locking member 31 locks the locking pin 411 of the locking projection 41 of the tray 2.0.
is locked in the disk loading completed state, and the protrusion 282 provided on the rotating shaft 28 turns off the switch 42 to stop the motor 21.

Further, as shown in FIG. 4, in order to take out the disc 33 with the disc 33 mounted on the turntable 34, when the loading key 13 is operated, the motor 21 is driven in reverse by a control circuit (not shown). be done. For this reason, the loading mechanism section 12 moves the tray 2o in the direction of arrow A by performing an operation substantially opposite to that when loading the disc 33 on the turntable 34, and moves the tray 2o to the disc loading position shown in FIG. It is.

Here, the clamper mechanism 18 that holds the disc 33 in pressure contact with the turntable 34 in a state where the disc loading is completed as described above will be described. That is, as shown in FIG. 2 again, the mounting structure 17
A mounting member 43 is supported in a connected manner on the support stands 118 and 118. On the lower surface of this mounting member 43, a shaft 4 is provided approximately parallel to the mounting member 43 at approximately the center thereof.
4 is supported on this shaft 44, and an intermediate portion of a clamper lever 45 is rotatably supported on this shaft 44. This clamper lever 45 has an extending portion 451 formed at its base end; 45 is the mounting part 176 of the above mounting structure IV.
It is inserted through four position regulating portions 179 formed in the. Further, at the distal end of the clamper lever 45, facing the turntable 34, a two-clamper portion 46 formed of a magnetic material and having a cylindrical shape with a bottom is supported with an appropriate amount of play. This clamper part 4 B #tsotD
A collar portion 46 that locks the vicinity of the hole of the disk 33 at the tip
1 is formed, and is fitted into the fitting portion 341 of the turntable 34 via the disk 33 due to its magnetic force. A spring 47 is engaged between them, and the elastic force of this spring 4r urges the turntable 34 in a direction away from it.

Further, a substantially concave drive lever 48 is rotatably supported at both ends of the shaft 44 supported by the clamper lever 45. That is, as shown in FIG. 9, this drive lever 48 has the second eccentric cam 30 at its base end.
An engaging portion 481 that slides into sliding contact with and selectively locks the first and second locking studs SO1, 5oz- of the M2 eccentric cam 30.
is formed. One end of a torsion spring 49 wound around the shaft 44 is engaged with the drive lever 48, and the other end of this torsion spring 49 is engaged with the base of the clamper lever 45. For this reason, the drive lever 48 and the clamper lever 45
and are adapted to be rotated together in conjunction with each other.

Here, the operation of the clamper mechanism 18 configured as described above will be explained. That is, when the tray 20 is loaded in the direction of arrow B as described above, the movable rack 39 reaches the position shown in FIG. 10 from the position shown in FIG. The lock gear 28 is meshed with the gear 28 to rotate the lock gear 28 counterclockwise in the figure. Therefore, the second eccentric cam 30 provided coaxially with the lock gear 28 is rotationally driven in the same direction. At this time, the second eccentric cam 30 causes the engaging portion 481 of the drive lever 48 that is locked in the first lock groove 30 to slide into contact with the peripheral edge of the second eccentric cam 30 and move. It is locked in the second lock groove 302 as shown in FIG. Therefore, as shown in FIGS. 12(a) and 12(b), the engaging portion 48 of the drive lever 48 is pressed against the peripheral edge as the second eccentric cam 30 rotates, and the drive lever 48 is rotated about the shaft 281. It is rotated counterclockwise in the figure. Here, as the drive lever 48 rotates, the clamper lever 4
5 in the same direction to fit the clamper part 46 of the clamper lever 45 into the fitting part 341 of the turntable 34. At this time, as described above, the rotating plate 35 of the tray 20 The clamper part 46 presses the disk 33 against the turntable 34 by its magnetic force, and the mounting of the disk 33 on the turntable 34 is completed here. It is.

Further, in the clamped state of the disk 33 as described above, when the disk loading mechanism is reversed as described above, the movable rack 39 is moved in the direction of arrow A. Therefore, since the lock gear 28 is reversed, the drive lever 48 and the clamper lever 45 perform an operation substantially opposite to the above-mentioned clamping operation, and each returns to its original position, and the explanation thereof will be omitted for the sake of convenience. do.

Here, FIG. 13 shows the first tooth portion 3 of the movable rack 39.
93 is shown in detail. That is, the first tooth portion 393 has a notch 397 formed in the vicinity thereof from the base end to a predetermined position to prevent engagement and locking. The first tooth portion 393 has, for example, two tooth tips cut out at an acute angle as shown by diagonal lines in the figure from the base end thereof, and a notched tooth portion 398 is formed thereon.

Then, when the fifth reduction gear 27 is engaged with the notch tooth portion 398 of the first tooth portion 393 by utilizing the elasticity of the notch portion 397, the movable rack 39 is moved to the fixed rack at approximately the same time. The third reduction gear 25 is removed from the tip of the gear 38. In this way, the first tooth portion 393 of the movable rack 39
The elasticity of the notch 397 prevents the locked state caused by the simultaneous meshing of the third and fifth reduction gears 25 and 27, thereby preventing overload on the motor 21 and saving power. It is promoted.

Further, the first tooth portion 39 of the movable rack 39 is
By forming the notch tooth portion 398 on the third gear, as described above, the rotational force of the motor 21 is transmitted from the third reduction gear 25 and the fixed rank 38 to the fifth reduction gear 27 and the first of the movable two gears 39. This prevents an overload condition due to simultaneous meshing when shifting to the tooth portion 393, allowing smoother operation and promoting power saving measures.

Then, as described above, when the tray 20 reaches the disk drive position and stops, the movable rack 39 is driven by the fifth reduction gear 27, thereby operating the locking member 28, and the cough tray 20 is moved to the disk drive position. It is designed to lock. Therefore, for example, when the disc 33 is being played, the tray 20 is reliably locked at the disc drive position, preventing malfunctions and improving safety.

Further, when the tray 20 reaches the disk drive position and is stopped, the movable rack 39 is driven by the fifth reduction gear 27, and in conjunction with this, the rotary plate 35 rotates with respect to the tray 20. The disc 33 is held by the turntable 34 by being lowered while moving, and the through hole 352 of the rotary disc 35 is made to face the track of the pickup 32. Therefore, the rotary plate 35 has a simple configuration, and can be easily and reliably controlled so that it operates when the tray 20 reaches the disk drive position, and it greatly contributes to miniaturization of the mounting itself. It's something you get.

Then, as described above, the clamper mechanism 18
0 reaches the disk drive position and is stopped, the fifth reduction gear 27 is transferred to the lock gear 28 via the movable two gears 39.
By driving the clamper lever 45, the disc 33 is brought into pressure contact with the turntable 34. Therefore, the clamper mechanism 18 can be simplified in its configuration, thereby promoting miniaturization, and can perform simple and reliable control such that the disc 33 is attached to the turntable 34 in a predetermined state. It is.

In addition, in the above-mentioned clamper mechanism 18, the
The pump part 46 moves the disk 33 to the rotary plate 35 of the tray 2θ.
The disk 33 is attached to and detached from the turntable 34 by raising and lowering the rotary disk 35 while being in pressure contact with the turntable 34.

Therefore, the disc 33 can be easily and reliably attached to and removed from the turntable 34 in a predetermined state, and the clamper lever 45 has a simple structure and can operate reliably.

In the above-mentioned disk loading mechanism, all of its operations are performed by the third and fifth reduction gears 25.2 having different reduction ratios, to which the driving force from the same power source is transmitted in series.
7 was used to satisfy the requirements. Therefore, the configuration of the loading drive system is simple and inexpensive, and the operations of each part of the system can be controlled reliably and smoothly.

Further, the fixed rack 38 and the movable rack 39 operate each part using third and fifth reduction gears 25 and 21 having the same drive system and different reduction ratios, respectively.
Moreover, these third and fifth reduction gears 25.27! The fixed rank 38 and the first tooth portion 393 of the two movable teeth 39 are configured to mesh at the same time so that the transmission force is transferred to each other, so that the drive system can be controlled reliably and easily. It's something you get.

In the above loading mechanism, the disk 33
The through hole 352 for laser irradiation of the rotary plate 35 on which the disk is placed is arranged substantially in the loading direction at the disk mounting position, and is tilted at a predetermined angle with respect to the loading direction when loading is completed. .

For this reason, when the through hole 352 for laser irradiation is positioned in the loading direction or in the direction substantially perpendicular to the loading direction as in the conventional case, the loading mechanism determined by the shapes of the disk 33 and the pickup 32 is On the other hand, by configuring the through hole 352 to be inclined with respect to the loading direction as described above, its shape can be made smaller, which can promote downsizing of the device.

Next, the disc playback mechanism section 19 that plays back the disc 33 will be explained. As shown in FIGS. 2 and 5 again, the mounting structure 17 has a substantially plate-shaped mounting body 50 in its through hole 177. It is screwed in with a screw 51 at a predetermined angle with respect to the loading direction. A substantially rectangular through hole 501 for guiding the pickup is formed in this mounting body 50, and the pickup 32 is disposed in this through hole 501 via a pickup mounting base 52. Here, when the disk loading is completed, the rotary disk 35 (see FIG. 4) is rotated and lowered as described above, so that the pickup 32 is inserted into the through hole 352 of the rotary disk 35 for laser irradiation. Correspondingly, it is disposed at a predetermined angle with respect to the loading direction and is movable in the directions of arrows C and D. The pickup 32 irradiates and receives a laser beam onto the disk 33 during its moving process. It is moved at a predetermined speed toward the outer periphery.

Further, the turntable 34 is rotatably disposed in the mounting body 50 near one side of the through hole 501.

The base end of the turntable 34 is connected to the shaft of a turntable driving motor (not shown) via a bearing 340, and is controlled by the motor in a predetermined manner in conjunction with the operation of the operating section 16 (see FIG. 1). Here, FIG. 14 shows an important use of a pickup feeding mechanism for moving the pickup 32 in a predetermined direction. In other words, the pickup mounting base 52 is At one end thereof, a rack gear 53 (see FIG. 15) having elasticity is formed, and a support plate 520 from which a pair of guide support parts 521 and 522 are protruded so as to sandwich the rack gear 53 is attached. It will be worn. These guide support parts 521, 522
has guide holes 523, 52 facing each other approximately in the center thereof.
4 is formed, and guide rods 5 are formed in the system internal holes 523, 524.
4 is inserted. A worm gear 55 corresponding to the rack gear 53 of the pickup mount 52 is coaxially fitted at a predetermined interval in the middle of the guide rod 54 . Further, the guide rod 54 has both ends connected to the guide hole 62.
3 and 524, they are rotatably supported by bearing portions 512 and 5'13 formed on the mounting body 50, respectively. One end of the guide rod 54 is connected to the bearing portion 51.
2.513, a transmission gear 56 is further coaxially provided, and a drive gear 57 is meshed with this transmission gear 56. The drive gear 57 is coaxially provided with a rotating shaft 581 of a pickup feed motor 58 installed on the lower surface of the mounting body 50, and is configured to transmit the rotational force of the cough motor 58 to the transmission gear 56. being done.

On the other hand, a clamping part 59 is formed at the other end of the pickup mounting base 52 for pinching and guiding the vicinity of the peripheral edge of the through hole 501 of the mounting body 50.

This clamping part 59 has a guide row 2591 at its upper end corresponding to the upper surface of the peripheral edge of the through hole 501 and a guide protrusion 592 at its lower end corresponding to the lower surface of the peripheral edge of the through hole 501.
It has the following.

That is, in order to move the pickup 32 in the direction of arrow C in the pickup feeding mechanism configured as described above, for example, the motor 5B is driven counterclockwise in the figure to rotate the drive gear 5r in the same direction. Then, the drive gear 57 rotates the transmission gear 56 clockwise in the drawing, and rotates the worm gear 55, which is coaxially provided via the transmission gear 56 and the guide rod 54, in the same direction.

At this time, this worm gear 55 is connected to the pickup mounting base 5.
By being in an elastic meshing relationship with the second rack gear 53, the pickup mount 52 is driven linearly in the direction of arrow C as the worm gear 55 rotates. Therefore, the pickup mounting base 52 is guided by the guide support portions 521 and 522 through which the guide rod 54, which is the center of rotation of the worm gear 55 and the transmission gear 56, and the clamping portion 59 move together with the pickup 32 in the direction of arrow C. It will be moved to

Further, when the pickup 32 is moved in the direction indicated by the arrow, the motor 58 is reversed to perform an operation substantially opposite to the movement in the direction indicated by the arrow, and is moved in the direction indicated by the arrow. The explanation will be omitted for convenience.

In this way, in the above-mentioned pickup feeding mechanism, the rack gear 53 corresponding to the movement position of the pickup 32 is provided on the pickup mounting base 52 which is movably provided to support the pickup 32, and the rack gear 53 is meshed with the rack gear 53. By rotationally driving the worm gear 55, the rack gear 53 is driven and the big up 3 is rotated.
Since the pickup 2 is configured to move in a straight line, the configuration of the transmission system can be simplified, and the pickup 32 can be easily and reliably controlled with high precision.

Furthermore, the configuration of the transmission system can be simplified, which facilitates downsizing, and the number of parts is reduced, resulting in lower costs.

Here, when the disk loading is completed as described above, if the play key (see FIG. 1) of the operation section 16 of the cabinet 1 is operated to play the disk 33, the The turntable drive motor is driven to rotate the disk 33 mounted on the turntable 34 to a predetermined state, and the disk 33 is transferred from the pickup 32 through the through hole 352 formed in the rotation plate 35 of the tray 20. A laser beam is irradiated onto the signal recording surface. This laser beam t hits the signal recording surface of the disk 33 and is reflected, and the reflected beam is received by the pickup 32. At this time, the pickup 32 detects the intensity and temporal length of the light, and generates an electrical A signal is output, recorded on the disk 33, and a digitally encoded signal is extracted.

Then, the pickup 32 is moved from the inner circumference to the outer circumference of the disk 33 by the pickup feeding mechanism, and reproduction of the nuclear disk 33 is completed.0Here, when the loading key 13 is operated again, the disk loading mechanism moves as described above. is reversed, the tray 20 is moved to the position shown in FIGS. 4 and 3, and reaches the disk loading position shown in FIG. 2, where the disk 33 is attached and detached.

It goes without saying that the present invention is not limited to the above embodiments, and that various modifications can be made without departing from the gist of the invention.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to provide an optical disc record playback device that has a simple configuration, can promote downsizing, and can easily and reliably perform high-precision control. can.

[Brief explanation of drawings]

FIG. 1 is an external perspective view showing an optical disc record playback device according to an embodiment of the present invention, FIG. 2 is a perspective view showing the disc loading mechanism and disc playback mechanism shown in FIG. 1, and FIG. 4 is a perspective view showing the operating state of FIG. 2, FIG. 5 is a perspective view showing a part of FIG. A perspective view showing some details of Figures 3 and 4, Figure 9, Figure 1
0 and 11 are perspective views showing other details of FIGS. 2, 3, and 4, respectively, and FIGS. 12(a) and 11 (
b) is a plan view showing the operation of the clamper lever in Fig. 2, Fig. 13 is a plan view showing some details of the movable rack in Fig. 2, and Fig. 14 shows the pick-up mechanism in Fig. 2 taken out. The perspective view, FIGS. 15(a) and 15(b) are a plan view and a sectional view showing some details of FIG. 14, respectively. DESCRIPTION OF SYMBOLS 11... Cabinet, 12... Loading mechanism part, 13... Loading key, 14... Power key, 15... Display part, 16... Operation part, 17... Mounting structure, 18 . . . 2-bar mechanism, 19 . . . Disc playback mechanism section, 20 . . . Tray, 21 . . . Motor,
22... Drive gear, 23... First reduction gear, 24
...Second reduction gear, 25...Third reduction gear, 2
6... Fourth reduction gear, 27... Fifth reduction gear,
28... Lock gear, 29... First eccentric cam, 3
0... Second eccentric cam, 31... Lock member, 17
6... Rotating shaft, 127... Through hole, 32... Pick-up, 33... Disc, 34... Turntable, 35... Rotating plate, 36. :1F...guidance member,
38...Fixed rack, 39...Movable rack, 40.
... Drive member, 41... Projection, 42... Switch, 43... Mounting member, 44... Shaft, 45... Clamper lever, 46... Clamper part, 461...
Tsuba Miyako, 47...Spring, 48...Drive lever, 49...Torsion spring, 50...Mounting body, 51...Screw, 52...Pickup mounting base, 5
3...Latsu Applicant's Representative Patent Attorney Takehiko Suzue Figure 7 Figure 8 Figure 10 Figure 11 Figure 94

Claims (1)

[Claims] In an optical disc record playback device comprising a pickup feeding mechanism that can freely transport a pickup for playback in a radial direction of an optical disc, the pickup feeding mechanism has one end of the pickup installed in the same direction as the transporting direction. The pickup is supported by a drive shaft with a worm gear fitted in the middle, a rack gear is provided along the drive shaft on the side of the supported part of the pickup, and the worm gear is meshed with the rack gear. Optical disc record playback device 0 characterized by the ability to close the disc.