JPH0241815B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present 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 its problems]

Recently, in the field of audio equipment, digital recording and reproducing methods that utilize PCM (pulse coat modulation) technology have emerged and are becoming popular in order to achieve as high fidelity as possible. In other words, this is what is called digital audio conversion, and the principle is that the audio characteristics are independent of the characteristics of the recording medium and are far superior to conventional analog systems. This is because it has been established. In this case, a system that uses a disk as a recording medium is called a DAD system, and known playback methods include optical, electrostatic, and mechanical. Regardless of which of these playback methods is adopted, the playback device that embodies it is still required to have various advanced functions and performance that are not found in conventional devices. be done.

For example, in an optical disc record playback device that uses the CD (compact disc) method among optical playback methods, pits (irregularities with different reflectances) are formed on a transparent resin disk in accordance with digitized (PCM) data. An optical disk with a diameter of 12 cm and a thickness of 1.2 mm, which is coated with a metal thin film, is heated at approximately 200 to 500 rpm using the CLV (Constant Linear Velocity) method.
Drive at variable rotational speed of pm. In this case, this disc has a track pitch of 1.6 μm and contains a huge amount of information that can be played in stereo for about an hour on one side, so it has various advanced functions and performance. It is easy to understand what you need.

The next requirement for the above-mentioned optical disc record playback device is to be able to operate each mechanical part reliably with an organic and simple configuration with no waste, to promote miniaturization, and to reduce power consumption. 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, as this type of disk loading mechanism, vertical and horizontal types are considered, and the horizontal type is said to be more advantageous in terms of disk drive controllability. This is because the horizontal type has not achieved high precision with the simplest possible configuration.

In this case, it is not enough to simply load the disc horizontally, but also to meet various requirements of the optical disc record playback device as a whole in relation to the disc playback mechanism including the pick-up drive mechanism and the disc drive mechanism. It must be something that can be handled.

[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 equipped with a pick-up feeding mechanism for freely transporting a pick-up for playback in the radial direction of an optical disc, wherein the pick-up feeding mechanism is provided at one end of the pick-up. a bearing part that rotatably supports a drive shaft having a worm gear fitted therein, which is installed in the same direction as the transfer direction; The invention is characterized in that it has a rack gear meshed with the gear, a notch is provided in the bearing part, and the drive shaft is rotatably supported by a plurality of contact points.

[Embodiments of the Invention] Before describing one embodiment of the present invention, a basic example of a CD-type optical disc record reproducing apparatus to which the present invention is applied 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 which is the basis of the present invention, and 11 is a cabinet. The front panel 111 of the cabinet 11 has a so-called horizontal loading mechanism in which a DAD (hereinafter referred to as disk) loading mechanism 12 can be moved in and out in the directions of arrows A and B in conjunction with the operation of a loading (LOADING) key 13. The disc is placed horizontally on the tray portion and is carried and mounted approximately horizontally to the disc drive position for playback, and the details will be described later.

Note that 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; At the bottom of the , there is a play key (PLAY) for play operation,
Stop key (STOP), next key (NEXT), first forward key (F・F) for first forward operation, backword key (BWD) for backward operation, pause key (PAUSE), repeat key (REPEAT) , etc., the operation section 16 has the loading key 13.
are arranged in parallel.

Here, FIG. 2, FIG. 3, and FIG. 4 respectively show the states of the loading mechanism section 12 before, during, and after disk loading.
First, in FIG. 2, 17 is the clamper mechanism 1
8, the loading mechanism section 12, disk reproducing mechanism section 19, etc. are attached to the mounting structure 17, which has an approximately inverted concave shape. It is arranged to be movable in the B direction. That is, as shown in FIG. 5, the mounting structure 17 is provided with a pair of ribs 171, 171 for installing the cabinet 11 (see FIG. 1) at both ends thereof, and
A generally concave guide portion 172 is formed at the tip of the upper surface. This guide portion 172 has a pair of guide rollers 173 and 1 on the inside of both sides thereof.
74, and a loading drive motor 21 is disposed near one end of the bottom surface thereof.
This motor 21 has a drive gear 2 on its rotating shaft 211.
2 are provided coaxially, and this drive gear 22
First, second, third, fourth and fifth reduction gears 23 to 27 are sequentially meshed with each other.

Furthermore, a locking 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 rotation shaft 281 of this lock gear 28 is inserted through both ends of a substantially concave mounting portion 175 formed in the mounting structure 17, and first eccentric cams 29 for lock driving are located near both ends of the mounting portion 175. A second eccentric cam 30 for driving the clamper is coaxially provided. Furthermore, a rotating shaft 176 is provided on the mounting portion 175 substantially parallel to the rotating shaft 281, and the locking member 31 is supported on this rotating shaft 176. This lock 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 lock member 31 and the attachment portion 175, and is biased counterclockwise in the figure.

On the other hand, the second eccentric cam 30 is eccentric in substantially the same manner as the first eccentric cam 29, and has first and second locking grooves 301 and 302 for clamper locks at its lowest and highest eccentric positions. It is formed.

Here, the mounting structure 17 has a through hole 177 formed approximately in the center of its upper surface. A turntable 34 having a fitting part 341 that is inserted into the hole of the pick-up 32 and the disk 33 (indicated by the two-dot chain line in FIG. 2) is attached to the through hole 177, which will be described later. Disc playback mechanism section 1
9 is disposed at a predetermined angle with respect to the loading direction (direction of arrows A and B).

Furthermore, support stands 178, 178 for supporting the clamper lever are erected on the upper surface of the mounting structure 17 at both ends corresponding to the mounting portion 175.

Here, the mounting structure 1 configured as described above is
The loading mechanism attached to 7 will be explained. That is, as shown in FIG. 2 again, the tray 20 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 in the approximate center of the tray 20, and a plurality of guide grooves 202 (see FIG. (Only one portion in the middle is shown) is formed to be inclined downward. A rotary plate 35 on which the disk 33 is placed is installed in the through hole 201. This turning plate 35
has a plurality of guide grooves 2 of the through hole 201 on its periphery.
A plurality of protrusions 351 (only one location is shown in FIG. 4 for convenience of illustration) corresponding to the tray 20 are formed at predetermined intervals, and the plurality of protrusions 351 correspond to the plurality of guides for the tray 20. It is guided by the groove 202 and can be rotated clockwise or counterclockwise in the figure, and can also be moved up and down.

In addition, in the rotary disk 35, there are laser irradiation through holes 352 located in the loading direction (that is, the directions of arrows A and B) before and during disk loading.
is formed from the center toward the outer circumference. After loading the disc, the rotary plate 35 is guided by the plurality of guide grooves 202 with its plurality of protrusions 351 and rotated counterclockwise in the figure, as shown in FIG. Since it is lowered, 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 disk attachment/detachment recesses 203, 204, and 35.
3 and 354 are formed so as to face each other before and during disk loading, as shown in FIGS. 2 and 3. Of these, the recesses 353 and 354 of the rotary disk 35 are formed as shown in FIG. As shown, they are spaced apart from the recesses 353 and 354 of the tray 20, respectively.

Furthermore, guide members 36 and 37 are formed at both ends of the tray 20 and extend from one end thereof in correspondence with the guide portions 172 of the mounting structure 17, respectively. These guide members 36 and 37 each have a guide groove portion 361 (for convenience of illustration, the guide member 37 is not shown).
3,174. Therefore, in the tray 20, each guide groove portion 361 of the guide members 36, 37 is connected to the guide portion 1 of the mounting structure 17.
It is engaged and guided by rollers 173 and 174 of 72 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 fixing rack 3
8 is the mounting structure 17 attached to the lower surface of the tray 20.
It is formed corresponding to the third reduction gear 25, and has guide pins 381,
382 is provided protrudingly.

On the other hand, the movable rack 39 disposed on the upper surface of the fixed rack 38 has guide holes 391 and 392.
are formed, and guide pins 381, 382 of the fixing rack 38 are inserted into these guide holes 391, 392, respectively. Then, the movable rack 3
9 has a first tooth portion 3 at its tip, the details of which will be described later.
93 is formed to correspond to the fifth reduction gear 27 of the mounting structure 17, and a second tooth portion 394 is formed at the base end thereof to correspond to the lock gear 28. Further, a movable portion 395 is formed at the tip of the movable rack 39 to protrude inward, and a pin 396 is formed at the tip of the movable portion 395. And this pin 39
6, one end of a drive member 40 is rotatably supported, and the other end of this drive member 46 is connected to the rotary plate 3.
It is rotatably supported by a pin 355 protruding from 5.

Also, as shown in FIG. 2 again, the tray 20
A locking protrusion 41 is formed at its base end, and a locking pin 411 is formed in this protrusion 41 in correspondence with the locking groove 311 of the locking member 31 of the mounting structure 17.

Here, the operation of the loading mechanism section 12 configured as described above will be explained in detail.

That is, when the loading 13 (see FIG. 1) is operated to mount the disk 33 on the turntable 34 in the state before disk loading (disc mounting position) shown in FIG. 2, the motor 21 is driven and the gear 22 is Rotate counterclockwise in the middle. Then, this rotational force is applied to the gear 2
2 to the first, second, third, fourth and fifth reduction gears 23 to 27. At this time, the third reduction gear 2 meshed with the base end of the fixed rack 38
5 is rotationally driven in the counterclockwise direction in the figure, the tray 20 is moved furthest in the direction of arrow B (disk drive position) as shown in FIG. 7, and its movement is stopped. Here, the third reduction gear 25 is removed from the tip of the fixed rack 38, and at this time, the fifth reduction gear 27, which is further decelerated and driven in the same direction, is moved from the first reduction gear 27 of the movable rack 39. The lock gear 28 is meshed with the base end of the toothed portion 393, and the second toothed portion 394 of the movable rack 39. The movable rack 39 is then moved by the fifth reduction gear 27 to the position shown in FIG. At this time, the movable portion 395 of the movable rack 39 is moved in the direction of arrow B, so that the drive member 40 presses the pin 355 of the rotary plate 35. Therefore, the rotary plate 35 is lowered while being rotated counterclockwise in the figure with its plurality of protrusions 351 guided by the plurality of guide grooves 202 of the tray 20. Here, the rotary disk 35 has a through hole 352 for laser irradiation that 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 reaches the position shown in FIG. 10 from the position shown in FIG.
When engaged, the lock gear 28 is rotated counterclockwise in the figure. At this time, this lock gear 2
8, the first eccentric cam 29 presses the sliding contact portion 312 of the lock member 31, and the lock member 31 resists the biasing force of the spring 60 and rotates its rotation shaft 17.
6 in the counterclockwise direction in the figure. Therefore, as shown in FIG. 11, the locking groove 311 of the locking member 31 locks the locking pin 411 of the locking protrusion 41 of the tray 20, so that the tray 20 is in the disk loading completed state. The rotating shaft 28
A protrusion 282 provided on the motor 1 turns off the switch 42 and stops the motor 21.

Further, as shown in FIG. 4, when the disc 33 is mounted on the turntable 34 and the disc 33 is to be removed, the loading key 13 is first operated, and a control circuit (not shown) starts the motor 21. is driven in reverse. Therefore, the loading mechanism section 12 is connected to the disk 33.
The tray 20 is moved in the direction of arrow A by an operation that is substantially the reverse of that for mounting the disk on the turntable 34, and is brought to the disk mounting position shown in FIG.

Here, the clamper mechanism 18 that holds the disk 33 in pressure contact with the turntable 34 in a state in which disk loading has been completed as described above will be described. That is, as shown in FIG. 2 again, the support bases 178, 1 of the mounting structure 17
The mounting member 43 is supported by the mounting member 78 in a continuous manner. A shaft 44 is supported on the lower surface of the mounting member 43 at a substantially central portion thereof and substantially parallel to the mounting member 43, and an intermediate portion of a clamper lever 45 is rotatably supported on this shaft 44. Ru.
This clamper lever 45 has an extending portion 4 at its base end.
51 is formed, and this extending portion 451 is inserted into a position regulating recess 179 formed in the mounting portion 175 of the mounting structure 17. Further, a clamper portion 46 formed of a magnetic material and having a bottomed cylindrical shape is supported at the distal end of the clamper lever 45 so as to face the turntable 34 with an appropriate amount of play. This clamper part 46 has a collar part 461 formed at its tip that locks the vicinity of the hole in the disk 33, and the magnetic force of the collar part 461 causes the turntable 34 to move through the disk 33.
It is adapted to be fitted into the fitting portion 341 of the.

A spring 47 is engaged between the tip of the clamper lever 45 and the mounting member 43, and the elastic force of the spring 47 biases the clamper lever 45 in a direction away from the turntable 34. It is something.

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, the ninth
As shown in the figure, this drive lever 48 has its base end slidably in contact with the second eccentric cam 30, and has first and second lock grooves 301 of the second eccentric cam 30.
An engaging portion 481 that selectively engages 302 is formed. One end of a torsion spring 49 wound around the shaft 44 is engaged with the drive lever 48.
The other end is engaged with the base of the clamper lever 45. Therefore, the drive lever 48 and the clamper lever 45 are configured to rotate 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. 28 and rotates the lock gear 28 counterclockwise in the figure. Therefore, the second eccentric cam 30, which is provided coaxially with the lock gear 28, is driven to rotate in the same direction. At this time, the second eccentric cam 30 is moved to the drive lever 48 which is locked in the first lock groove 301.
The engaging portion 481 of the second eccentric cam 30 is moved in sliding contact with the peripheral edge of the second eccentric cam 30 and is locked in the second locking groove 302 as shown in FIG. For this reason, the first
As shown in FIGS. 2a and 2b, the engaging portion 481 of the drive lever 48 is pressed against the peripheral edge as the second eccentric cam 30 rotates, and rotates counterclockwise in the drawings around the shaft 281. be moved. Here, the drive lever 48 rotates the clamper lever 45 in the same direction as the drive lever 48 rotates.
The clamper section 46 of No. 5 is fitted into the fitting section 341 of the turntable 34. At this time, as described above, since the rotary plate 35 of the tray 20 is lowered while being rotated relative to the tray 20, the clamper section 46 presses the disk 33 against the turntable 34 by its magnetic force. At this point, the mounting of the disk 33 onto the turntable 34 is completed.

Furthermore, 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 moves as shown by the arrow A.
direction. Therefore, the lock gear 28
Since this is reversed, the drive lever 48 and clamper lever 45 perform an operation substantially opposite to the above-mentioned clamping operation and are returned to their original positions, and a description thereof will be omitted for the sake of convenience.

Here, FIG. 13 shows the first part of the movable rack 39.
3 shows details of the tooth portion 393. That is, the first tooth portion 393 has a notch 397 formed in the vicinity of the root thereof from the base end to a predetermined position to prevent meshing and locking. The first tooth portion 393 has, for example, a notched tooth portion 398 for preventing engagement lock, which is formed by notching the tooth tips of two teeth at an acute angle as shown by diagonal lines in the figure, from the base end thereof.

As described above, 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 removed from the fixed rack at approximately the same time. 3rd from the tip of 38
The reduction gear 25 is disengaged. In this manner, the first tooth portion 393 of the movable rack 39 is configured to prevent a locked state caused by the simultaneous meshing of the third and fifth reduction gears 25 and 27 due to the elasticity of the notch portion 397 thereof. Therefore, overload on the motor 21 is prevented and power saving measures are promoted.

Furthermore, by forming a cutout tooth portion 398 on the first tooth portion 393 of the movable rack 39,
As mentioned above, the rotational force of the motor 21 is transmitted by the third
This prevents an overload condition due to simultaneous meshing when shifting from the fifth reduction gear 25 and the fixed rack 38 to the fifth reduction gear 27 and the first tooth portion 393 of the movable rack 39, resulting in smoother operation and a power saving measure. It can promote

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, which drives the tray 20 to the disk drive position. It is designed to lock in position.
Therefore, when the disk 33 is being played, for example, the tray 20 is reliably locked at the disk 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 is moved relative to the tray 20. The disc 33 is held by the turntable 34 and the through hole 352 of the rotary disc 35 is opposed to 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 the miniaturization of the device itself. It's something you get.

As described above, when the tray 20 reaches the disk drive position and is stopped, the clamper mechanism 18 causes the fifth reduction gear 27 to drive the lock gear 28 via the movable rack 39, so that the clamper lever 45 is activated. When operated, the disc 33 is brought into pressure contact with the turntable 34.
For this reason, the clamper mechanism 18 can be simplified in its configuration, promoting miniaturization, and can be easily and reliably controlled so 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 clamper section 46 moves the disk 33 onto the tray 2.
The disc 33 is attached to and detached from the turntable 34 by raising and lowering the rotary disc 35 while being in pressure contact with the rotary disc 35. Therefore, the disk 33 can be easily and reliably attached to and removed from the turntable 34 in a predetermined state.
The clamper lever 45 has a simple structure and can operate reliably.

In the above-mentioned disk loading mechanism, all the operations are satisfied using the third and fifth reduction gears 25 and 27 having different reduction ratios to which the driving force from the same power source is transmitted in series. Configured. Therefore, the configuration of the loading drive system is simple and inexpensive, and the operation of each part can be reliably and smoothly controlled.

In addition, the fixed rack 38 and the movable rack 39
The operation of each part is performed using third and fifth reduction gears 25 and 27 having different reduction ratios of the same drive system.
Since the reduction gears 25, 27 and the first teeth 393 of the fixed rack 38 and the movable rack 39 are configured to mesh at the same time so that transmission forces are transferred to each other, the drive system can be controlled reliably. This can be done easily.

In the above loading mechanism, the laser irradiation through hole 352 of the rotary plate 35 on which the disk 33 is placed is set substantially in the loading direction at the disk mounting position, and in a predetermined position with respect to the loading direction when loading is completed. It was configured to be inclined at an angle.

For this reason, the through hole 3 for laser irradiation is
52 is positioned in the loading direction or in a direction substantially perpendicular to the loading direction, the through hole 352 is positioned in the loading direction as described above for the loading mechanism section determined by the shapes of the disk 33 and the pickup 32. By configuring the device so that it is tilted, its shape can be made smaller, which can promote miniaturization of the device.

Next, the disc reproducing mechanism section 19 that reproduces the disc 33 will be explained.
As shown in the drawings and FIG. 5, a substantially plate-shaped mounting body 50 is screwed into the through hole 177 of the mounting structure 17 with a screw 51 at a predetermined angle with respect to the loading direction. This mounting body 50 has a substantially rectangular through hole 5 for guiding the pick-up.
01 is formed, and a pick-up 32 is disposed in this through-hole 501 via a pick-up mounting base 52. Here, the above-mentioned pick-up 32 is in a state where the disk loading is completed, and the above-mentioned rotary disk 35 is
(See FIG. 4) is rotated and lowered as described above, so the through hole 3 for laser irradiation of the rotary plate 35 is rotated and lowered as described above.
52, it is arranged 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 movement process. For example, in the playback state, the pickup 32 is moved from the inner periphery of the disk 33 along the through hole 501 by a pickup feeding mechanism (described later). It is moved toward the outer periphery at a predetermined speed.

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 drive motor (not shown) via a bearing 340, and the motor is activated in conjunction with the operation of the operation section 16 (see FIG. 1). It is designed so that it can be rotated to a predetermined state.

Here, FIG. 14 shows a pick-up feeding mechanism for moving the pick-up 32 in a predetermined direction. That is, an elastic rack gear 53 (see FIG. 15) is formed at one end of the pick-up mount 52, and a pair of guide support parts 521 for bearings are formed to sandwich the rack gear 53. , 522 is attached. This guide support part 52
1,522 are formed with guide holes 523, 524 facing each other at approximately the center thereof, and the guide holes 52
A driving guide rod 54 is inserted through 3,524. A worm gear 55 corresponding to the rack gear 53 of the pick-up mount 52 is coaxially fitted at a predetermined interval in the middle of the guide rod 54. Further, after the guide rod 54 has both ends inserted through the guide holes 523 and 524, the guide rod 54 is inserted into the bearing portions 512 and 51 formed in the mounting body 50, respectively.
3 is rotatably supported. One end of the guide rod 54 passes through one of the bearings 512 and 513, and then a transmission gear 56 is coaxially provided, and a drive gear 57 is in mesh with the transmission gear 56. be done. This drive gear 57 is coaxially provided with a rotation shaft 581 of a pickup feed motor 58 installed on the lower surface of the mounting body 50, and the rotational force of the motor 58 is transferred to the transmission gear 56.
It is designed to communicate to

On the other hand, a clamping part 59 is formed at the other end of the pick-up mounting base 52 for clamping and guiding the vicinity of the peripheral edge of the through hole 501 of the mounting body 50. The clamping part 59 has a guide roller 591 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 is what it is.

That is, in the pick-up feeding mechanism configured as described above, the pick-up 32 is moved in the direction of arrow C.
To move in this direction, for example, the motor 58 is driven counterclockwise in the figure, and the drive gear 57 is rotated 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, since the worm gear 55 is in an elastic meshing relationship with the rack gear 53 of the pick-up mount 52, the pick-up mount 52 is driven linearly in the direction of arrow C as the worm gear 55 rotates. Ru. For this reason, the above-mentioned pick-up mounting base 5
2 is guided by guide supports 521, 522 and a clamping part 59 into which the guide rod 54, which is the center of rotation of the worm gear 55 and the transmission gear 56, is inserted, and is moved in the direction of arrow C together with the pick-up 32. .

Further, when moving the pick-up 32 in the direction of arrow D, the motor 58 is reversed to perform an operation substantially opposite to the movement in the direction of arrow D described above, and is moved in the direction of arrow D. The explanation will be omitted for convenience.

As described above, in the above-mentioned pick-up feeding mechanism, the pick-up mounting base 52 which supports the pick-up 32 and is movably provided is provided with a rack gear 53 corresponding to the movement position of the pick-up 32, and is meshed with the rack gear 53. By rotationally driving the worm gear 55, the rack gear 53 is driven to move the pickup 32 in a straight line. Therefore, 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.

Now, with the disk loading completed as described above, the play key (see FIG. 1) of the operating section 16 of the cabinet 11 is operated without reproducing the disk 33. Then,
The turntable drive motor (not shown) is driven to rotate the disk 33 mounted on the turntable 32 to a predetermined state, and also to rotate the disk 33 mounted on the turntable 32 to a predetermined state. The signal recording surface of the disk 33 is irradiated with a laser beam. This laser beam 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, outputs an electrical signal corresponding to the intensity, and outputs an electrical signal that is recorded on the disk 33 and a digitally encoded signal is extracted therefrom. Then, the pick-up 32 is moved from the inner circumference to the outer circumference of the disk 33 by the pick-up feeding mechanism, and reproduction of the disk 33 is completed. Here, when the loading key 13 is operated again, the disk loading mechanism is reversed as described above, and the tray 20 is moved to the position shown in FIGS. 4 and 3, and the disk mounting position shown in FIG. At this point, the disk 33 is attached and detached.

Next, one embodiment of the present invention will be described in detail with reference to the drawings. FIG. 16 shows the main parts of the optical disc record reproducing apparatus according to the present invention.
(see Figure 4) with improved controllability. However, in FIG. 16, the same parts as those of the optical disk record reproducing apparatus of the basic example are given the same reference numerals, and the explanation thereof will be omitted.

That is, numeral 32 in the figure is the pick-up, and this pick-up 32 is attached to the pick-up mounting base 52 as described above. The pick-up mount 52 is rotated in conjunction with the rotation of the drive guide rod 54 inserted into the guide hole 523 (only one of which is shown in the figure) of the bearing guide support part 521 of the support plate 520, as described above. It is guided in a predetermined direction.

Here, the guide hole 523 of the guide support part 521 through which the intermediate portion of the guide rod 54 is inserted has a pair of notches, such as inclined portions 523A and 523B, at a predetermined position (for example, at the upper part in the figure) of the guide rod 54. It is formed into a substantially V-shape corresponding to the . As a result, the guide support portion 521 is connected to the inclined portion 52 of the guide hole 523.
3A, 523B to the guide rod 54.
It is supported in a state of point contact.

In this manner, the above-mentioned pick-up feed mechanism is configured such that the guide hole 523 of the guide support section 521 that supports the guide rod 54 is provided with inclined portions 523A and 523B so as to support the guide rod 54 in two-point contact. As a result, when the pick-up mounting base 52 is subjected to vibration due to an external impact, for example, the inclined portions 523A and 523B of the guide hole 523 reliably hold the guide rod 54 and prevent its displacement. .

Here, the guide hole 524 (see FIG. 14) of the other guide support part 522 of the support plate 520 is constructed in substantially the same manner as the guide hole 523 of the guide support part 521.

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 spirit 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 the drawing]

FIG. 1 is an external perspective view showing an optical disc record playback device which is a basic example of the present invention, and FIG.
The figures are a perspective view showing the disk loading mechanism section and the disk reproducing mechanism section of FIG. 1, and FIGS. 3 and 4.
The figures are a perspective view showing the operating state of Fig. 2, Fig. 5 is a perspective view showing a part of Fig. 2, and Fig. 6 is a perspective view showing the operating state of Fig. 2.
Figures 7 and 8 are perspective views showing some details of Figures 2, 3 and 4, respectively, and Figures 9, 10 and 11 are perspective views of Figures 2 and 3, respectively. Figures 12a and 12b are plan views showing the operation of the clamper lever in Figure 2, and Figure 13 is a part of the movable rack in Figure 2. 14 is a perspective view showing the pick-up mechanism shown in FIG. 2 taken out, FIG. 1 is a side view showing a main part of an optical disc record playback device according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 11... Cabinet, 12... Loading mechanism section, 13... Loading key, 14... Power key, 15... Display section, 16... Operation section, 17
...Mounting structure, 18...Clamper 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
Reduction gear, 26...Fourth reduction gear, 27...
Fifth reduction gear, 28... Lock gear, 29...
First eccentric cam, 30...Second eccentric cam, 31
... Lock member, 176 ... Rotation shaft, 177 ...
Through hole, 32...Pickup, 33...Disc, 34...Turntable, 35...Rotating plate,
36, 37...Guiding member, 38...Fixing rack,
39...Movable rack, 40...Driving member, 41...
...Protrusion part, 42 ... Switch, 43 ... Mounting member, 44 ... Shaft, 45 ... Clamper lever, 4
6...Clamper part, 461...Brim part, 47...
... Spring, 48 ... Drive lever, 49 ... Torsion spring, 50 ... Mounting body, 51 ...
Screw, 52... Pickup mounting base, 53... Rack gear, 54... Guide rod, 55... Worm gear, 56... Transmission gear, 57... Drive gear, 58
... Motor, 59 ... Clamping part, 60 ... Spring, 520 ... Support plate, 521, 522 ... Guide support part, 523, 524 ... Guide hole, 523A,
523B...Slope part.

Claims (1)

[Claims] 1. In an optical disc record playback device equipped with a pick-up feeding mechanism that can freely transport a pick-up for playback in the radial direction of an optical disc, the pick-up feeding mechanism is provided at one end of the pick-up and a bearing part that rotatably supports a drive shaft with a worm gear fitted in the middle, which is installed in the same direction as the pick-up; What is claimed is: 1. An optical disc record playback device, comprising: a rack gear; the bearing portion is provided with a notch, and the drive shaft is rotatably supported by a plurality of contact points.