JPS59135656A - Reproducing device of optical disk record - Google Patents

Abstract

PURPOSE:To attain simply and surely the control with high accuracy by providing two rack members and two transmission gear systems driving a loading mechanism and a clamper mechanism and cutting the tooth tip at the meshing start position of the two rack members so as to prevent locking of the two transmission gear systems. CONSTITUTION:The notch part 397 for preventing locking is formed at the vicinity of the tooth root from the root to a prescribed position of the 1st tooth part 393. Then, the notch tooth part 398 for preventing locking due to meshing is formed to the tooth part 393 by cutting the tooth tip of, e.g., two teeth from the root of teeth in an acute angle as shown in hatched lines. When a reducer gear 27 is meshed with the notch tooth part 398 of the tooth part 393 of the moving rack 39 by utilizing the elasticity of the notch part 397, a reducer gear 25 is detached from the tip of a fixed rack 38 almost at the same time. Since the gear part 393 of the moving rack 39 is formed so as to prevent the locking state caused by simultaneous meshing of the reducer gears 25, 27 in the tooth part 393 of the moving rack 39 by means of the elasticity of the notch part 397, overload to a motor 21 is prevented.

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, a digital recording and reproducing system that uses PCM (parent circuit modulation) technology has emerged and is becoming popular in order to achieve as high fidelity as possible. In other words, this is what is called digital audio, and the principle is to make the audio characteristics much better than the conventional analog system, which often depends on the characteristics of the recording medium. This is because it has been established. In this case, a disk (disk) is used as the recording medium.
The system that targets is called the DAD system,
Known reproduction 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 be capable of satisfying a variety of advanced functions and performance not found in conventional methods. .

For example, in an optical disc record playback device that uses the CD (Connoduct Disk) method among optical playback methods, the digital (PCM)
) Bits corresponding to converted data (irregularities with different reflectances)
diameter 12 cm s
An optical disk with a thickness of 1.2 μm is driven by a CtV (constant linear velocity) method at variable rotational speeds 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 contains a huge amount of information that can be played in stereo for about 1 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 enough to simply load the disc horizontally, but also to meet 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 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 power saving measures, 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 loading mechanism for horizontally loading an optical disc and a crankshaft mechanism for holding the disc in a horizontal position for playback with respect to a turntable. a first rack member that drives the mechanism; a second rack member that drives the crank t4r mechanism and is slidably supported with respect to the first rack member; and the first and second rack members. The device selectively applies a driving force to the rack member, and has first and second transmission gear systems configured to mesh together at the time of switching, and has a meshing start position of the second rack member. This is characterized in that the tips of the teeth are notched to prevent the first and second transmission gear systems from locking.

5- [Embodiment of the Invention] Hereinafter, an 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. A DAD (hereinafter referred to as disk) loading mechanism section 12 is mounted on the front panel of this cabinet 1.
LOADING) In conjunction with the operation of key 13, arrow A,
It is provided in a so-called horizontal loading type that can be freely moved in and out in the B direction, and the disc is placed horizontally on the tray section, and the disc is loaded and loaded approximately horizontally into the disc drive position for playback. This will be explained 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 In the lower row, there is a play key (PLAY) for play operation, a stop key (5TOP),
Next key 6 (NEXT), Fast forward key (F, F) for fast forward operation, Backward key (BwD) for Paraqua P operation, Pause key (PA)
An operation unit 16 having keys such as USE), RgpEAT, and the like is arranged parallel to the loading key 13.

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, reference numeral 17 denotes a mounting structure having a substantially reverse concave shape to which the loading mechanism section 12 including the clamper mechanism 18, the disc playback mechanism section 19, etc. are attached. A generally rectangular tray 20 is disposed so as to be movable in the directions of arrows A and B.

That is, as shown in FIG. 5, the mounting structure 17 is provided with a pair of collars 171° 171 for installing the cabinet 11 (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 173 and 174 on the inside of both sides thereof, and a loading drive motor 21 is provided near one end of the bottom surface of the guide portion 172.
will be placed. This motor 21 has a driving gear 22 coaxially provided on its rotating shaft 21.
2 has first, second, third, fourth and fifth reduction gears 23
27 are sequentially meshed.

Further, 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.

This lock gear 28 has its rotating shaft 281 inserted through both ends of a substantially concave mounting portion 1750 formed in the mounting structure 17, and a first eccentric cam 29 for lock driving and A second eccentric cam 30 for driving the crank is coaxially provided. Further, the mounting portion 175 is provided with a rotation shaft 176 substantially parallel to the rotation shaft 281, and the rotation shaft 176 is provided with the lock member 31.
is supported. This locking member 31 has a lock groove 31 formed at its tip, and a sliding contact portion 31 for one drive that slides into contact with the first eccentric cam 29 at its base end 1r.
2 is formed. A spring (not shown in FIG. 5 for convenience) is engaged between the locking member 3 and the mounting portion 175 at its base end, and is biased counterclockwise in the figure. .

On the other hand, the second eccentric cam 30 is connected to the first eccentric cam 2.
9, and first and second locking grooves 30 for cranometer and one lock are provided at the lowest and highest eccentric positions.
1.302 is formed.

Here, the mounting structure 12 has a through hole 177 formed approximately in the center of its upper surface. A turntable 34 having a fitting part 341 inserted through the hole of the pickup 32 and the disk 33 (indicated by the dotted line in FIG. 2) is attached to the through hole 177, which will be described later. The disc playback mechanism section 19 is in the loading direction (arrow A, B direction)
It is arranged at a predetermined angle with respect to the

The mounting structure 17 has the mounting portion 1 on its upper surface.
A pair of support stands 178, 178 for supporting the clamper lever are erected at both ends corresponding to 75.

Here, a loading mechanism configured to be attached to the attachment structure 17 configured as described above will be explained. That is, as shown in FIG. 2 again, the tray 20 is disposed on the mounting structure 17, on which the disk 33 shown by the two-dot chain line in the figure is mounted. A through hole 201 corresponding to the disk 33 is formed approximately in the center of the tray 20.
Double 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, respectively, and are inclined downward. And the above-mentioned through hole 2
A rotary plate 35 on which the disk 33 is placed is installed at 01. The rotary disk 35 has the above-mentioned through hole 20 on its periphery.
A plurality of protrusions 351 (corresponding to the plurality of guide grooves 202 of 1)
For convenience of illustration, the plurality of protrusions 351 are formed at predetermined intervals (only one location in FIG. 4 is shown), and the plurality of protrusions 351 are connected to the plurality of guide grooves
02, it can freely rotate in the direction of the clock and half-hour hand in the figure, and can freely move up and down.

Further, in the rotary disk 35, a laser irradiation through hole 352 located in the loading direction (that is, arrow A t B direction) before and during disk loading is formed from the center toward the outer circumference. The through holes 352 allow the rotary disk 35 to pass through the plurality of protrusions 351 into the plurality of guide grooves 20 as shown in FIG. 4 after the disk is loaded.
2 and is 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 concave portions 35.9 and 3 of the rotary disk 35 are
54, after disk loading, in which the rotary plate 35 is rotated counterclockwise in the figure with respect to the tray 20 as described above, from the recesses 953 and 354 of the tray 20, respectively, as shown in FIG. It is something that is separated.

The tray 20 also has guide members on both sides thereof.
6 and 37 are guide portions 172 of the mounting structure 17, respectively.
In response to that one end! It is formed in an extended state. These guide members 36 and 37 have guide groove portions 361 and (for convenience of illustration, the guide member 37 is not shown) corresponding to the guide rollers 173 and 174 of the guide portion 172 of the mounting structure 17, respectively. It is formed as follows. In this case, the tray 20 has its guide members 36, 37
Each guide groove portion 361 is connected to the guide portion 172 of the mounting structure 17.
are engaged and guided by rollers 173 and 174 of arrows A and B.
It is designed to be able to move freely in any direction.

Here, a fixed rack 38 and a movable rack 39 for driving loading are stacked on the lower surface of one end 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 guide bins 381 and 382 are protruded at a predetermined interval on the upper surface thereof. will be established.

Meanwhile, 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 inwardly, and a bin 396 is formed at the distal end of the movable 13 portion 395. One end of a drive member 40 is rotatably supported by this bin 396, and the other end of this drive member 46 is rotatably supported by a bin 355 protruding from the rotating disc 35. Ru.

Further, as shown in FIG. 2 again, the tray 20 is formed with a locking protrusion 41 at its base end, and this protrusion 41 has a locking groove 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 transmitted through the gear 22 to the first, second, third, fourth, and fifth reduction gears 23 to 27 (14-). At this time, the third
Since both front decelerations 25 are rotationally driven in the counterclockwise direction in the figure, the tray 20 is moved furthest in the direction of arrow B (disc 1 drive position) as shown in FIG. 7, and its movement is stopped.

Here, the third reduction gear 25 is detached 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 to the movable rack 39.
The lock gear 28 is meshed with the base end of the first tooth portion 3930 of the movable rack 39 , and the lock gear 28 is meshed with the second tooth portion 394 of the movable rack 39 . The movable rack 39 is then moved to the position shown in FIG. 8 by the fifth reduction gear 27. At this time, the movable portion 395 of the movable rack 39 is moved in the direction of arrow B, so that the driving member 40 presses the bin 355 of the rotary plate 35. In this case, the plurality of protrusions 351 of the rotary plate 35 are guided by the plurality of guide grooves 202 of the tray 20, and the rotary plate 35 is lowered while rotating counterclockwise in the figure. Therefore, the rotary plate 35 has a through hole 352 for laser irradiation, which will be described in detail later.
32 (namely, the directions of arrows C and D).

On the other hand, when the movable rack 39 reaches the position shown in FIG. 10 from the position shown in FIG. 28 is rotated ti=b in the counterclockwise direction 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 the lock member 3 rotates its rotation shaft 176 against the biasing force of the spring 60. It is rotated counterclockwise in the figure around the center. In this case, as shown in FIG.
1 locking pin 411 is locked, and the tray 20 is locked here in the disc loading completed state,
The protrusion 282 provided on the rotation shaft 281 is connected to the switch 4
2 is turned off to stop the motor 21.

Further, as shown in FIG. 4, when removing the disc 33 from a state where the disc 33 is mounted on the turntable 34, first, when the loading key 13 is operated, the motor 21 is reversed by a control circuit (not shown). Driven. For this reason, the loading mechanism section 12 moves the tray 20 in the direction of arrow A by performing an operation substantially opposite to that when loading the disc 33 on the turntable 34, and reaches the disc loading position shown in FIG. It is something.

The clamper mechanism 18 that presses and holds the disc 33 against the turntable 34 in a state in which disc loading has been completed as described above will now be described.

That is, as shown in FIG. 2 again, the mounting member 43 is supported in a continuous manner on the support bases 178, 178 of the mounting structure 17. On the lower surface of this mounting member 43, a shaft 44 is provided substantially parallel to the mounting member 43 at a substantially central portion thereof.
is supported, and a clamper lever 4 is supported on this shaft 44.
The middle part of 5 is rotatably supported 17-. This clamper lever 45 has an extending portion 45 formed at its base end, and this extending portion 45
1 is inserted into a position regulating recess 179 formed in the mounting portion 175 of the mounting structure 17. Further, a clamper part 46 formed of a magnetic material in the shape of a cylinder with a bottom is supported at the tip of the crank lever 45 with an appropriate amount of play, facing the turntable 34. . This Clasono 9 part 46 has the above-mentioned disk 3 at its tip.
A collar portion 461 is formed to lock the vicinity of the hole No. 3.
Due to the magnetic force, the disk 33 is fitted into the fitting portion 34 of the turntable 34.

Note that the clamper lever 45 has a spring 47 engaged between its tip and the additional member 43.
The elastic force of the spring 47 urges the turntable 34 in a direction away from it.

Still the above clan/'? - shaft 4 supported by lever 45;
A substantially concave drive lever 48 is rotatably supported at both ends of the drive lever 4 . That is, as shown in FIG. 9, this drive lever 48 has first and second lock grooves 301 and 302 of the second eccentric cam 30 in sliding contact with the second eccentric cam 30 at its base end. An engaging portion 481 is formed to selectively engage. 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. Therefore, the drive lever 48 and the clamper lever 45 are configured to rotate together in conjunction with each other.

Here, a crane or a mechanism 18 configured as described above is used.
The operation 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. 2B and rotates the lock gear 28 counterclockwise in the figure. In this case, the second eccentric cam 30 provided coaxially with this 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, which is locked in the first lock groove 301, to slide into contact with the peripheral edge of the second eccentric cam 30 and move to the second eccentric cam 30. As shown in FIG. 11, the drive lever 48 is engaged with the second locking groove 302. As shown in FIG. As the drive lever 48 rotates, it is pressed against the peripheral edge and rotated counterclockwise in the figure around the shaft 281.As the drive lever 48 rotates, the clamper lever 4
5 in the same direction to fit the clamper part 46 of the crankshaft or one lever 45 into the fitting part 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 part 46 presses the disk 33 against the turntable 34 by its magnetic force. At this point, the mounting of the disc 33 onto the turntable 34 is completed.

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. 3 shows the first tooth portion 39 of the movable rack 39.
This shows the details of 3. 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 is, for example, 2
As shown by diagonal lines in the figure, the tips of the teeth are notched at an acute angle to form a notched tooth portion 398 for preventing meshing and locking.

21- Then, as described above, when the fifth reduction gear 27 is engaged with the notch tooth portion 398 of the first tooth portion 393 using the elasticity of the notch portion 397, the movable rack 39 is engaged at approximately the same time. The third reduction gear 25 is removed from the tip of the fixed rack 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.

Furthermore, by forming the notched tooth portion 398 on the first tooth portion 393 of the movable rack 39, the transmission of the rotational force of the motor 21 is transmitted from the third reduction gear 25 and the fixed rack 38 to the first tooth portion 393 as described above. This prevents an overload condition due to simultaneous meshing between the reduction gear 27 of No. 5 and the first tooth portion 393 of the movable rack 39, allowing smoother operation and promoting power saving measures.

Then, as described above, when the tray 20 reaches the disk drive position and stops, the fifth reduction gear 27
When the movable rack 39 is driven, the locking member 28 is operated and the tray 20 is locked at the disk drive position. 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 orbit of the male 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.

Then, as described above, the clamper mechanism 18
0 reaches the disk drive position and is stopped, the fifth deceleration j seeking wheel 27 is moved to the lock gear 2 via the movable rack 39.
By driving 8, a clamper lever 45 is operated to press the disc 33 against the turntable 34. Therefore, the clamper mechanism I8 can be simplified in its configuration, thereby promoting miniaturization, and can perform simple and reliable control such that the disc 33 is mounted on the turntable 34 in a predetermined state. It is.

In addition, in the above-mentioned clamper mechanism 18, the clamper part 46 moves the disk 33 up and down with the disk 33 in pressure contact with the turntable 35 of the tray 20, thereby moving the disk 33 against the turntable 34. It is designed so that it can be attached and detached.

In this case, the disk 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 carried out by third and fifth reduction gears 25 e having different reduction ratios, to which the driving force from the same power source is transmitted in series.
27 was used to satisfy the requirements. The configuration of the Tonodame loading drive system is simple and inexpensive, and the operations of its various parts can be reliably and smoothly controlled.

Further, the fixed rack 38 and the movable rack 39 operate each part using third and fifth reduction gears 25 and 27 having the same drive system and different reduction ratios, respectively,
Moreover, these third and fifth reduction gears 25, 27 and the first tooth portions 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 and easily.

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 mounted is set 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. It was configured as follows.

For this reason, when the through hole 352 for laser irradiation is positioned in the loading direction or in a direction substantially perpendicular to the loading direction as in the conventional case, the loading mechanism part determined by the shape of the disk 33 and the big center 7'32 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 26-hole through hole 501 via a pickup mounting base 52. Here, the above pickup 3
2, the rotary plate 35 (
4) is rotated and lowered as described above, it has a predetermined angle with respect to the loading direction so as to correspond to the laser irradiation through hole 352 of the rotary plate 35, and arrow C, It is arranged so as to be movable in the D direction. The pickup 32 irradiates and receives a laser beam on the disk 33 during its movement process, and for example, in the playback state, the pickup 32 moves from the inner circumference of the disk 33 along the through hole 501 using 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 a predetermined position is set by the motor in conjunction with the operation of the operation section 16 (see FIG. 1). It is designed to be rotationally driven in the state of.

Here, FIG. 14 shows a pickup feeding mechanism for moving the pickup 32 in a predetermined direction. That is, an elastic rack gear 53 (see FIG. 15) is formed at one end of the pickup mounting base 52, and a pair of guide support parts 521 and 522 are formed to sandwich the rack gear 53. A protruding support plate 520 is attached. These guide support parts 521, 522
has guide holes 523, 52 facing each other approximately in the center thereof.
4 is formed, and a guide rod 5 is formed in this guide hole 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 52.
3 and 524, they are rotatably supported by bearing portions 512 and 513 formed on the mounting body 50, respectively. One end of the guide rod 54 is connected to the bearing portion 512.
．． After inserting one of the transmission gears 513, the transmission gear 5
6 are provided coaxially, and a drive gear 57 is meshed with this transmission gear 56. This driving gear 57 is installed on the lower surface of the mounting body 50 and is coaxially provided with a rotating shaft 581 of a Tsuquazzo feed motor 58, so as to transmit the rotational force of the motor 58 to the transmission gear 56. is 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 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 has the following.

In other words, the pickup feed υ configured as described above
In order to move the pickup 32 in the direction of arrow 29-C in the mechanism, for example, the motor 58 is driven counterclockwise in the figure to rotate the drive gear 57 in the same direction. Then, the drive gear 57 drives the transmission gear 56 one rotation clockwise in the drawing, and rotates and drives the worm gear 55, which is provided coaxially with the transmission gear 56 via the guide rod 54, in the same direction. . At this time, this worm gear 5
5 is in an elastic meshing relationship with the rack gear 53 of the pickup mount 52, so that the pickup mount 52 is linearly driven in the direction of arrow C as the worm gear 55 rotates. In this case, 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 toward the arrow C along with the pickup 32.
It is something that is moved in the direction.

When moving the big rollers 7' and 92 in the direction indicated by the arrow, the motor 58 is reversed to perform an operation 30- which is approximately the opposite of the movement in the direction indicated by the arrow, and is moved in the direction indicated by the arrow. Therefore, the explanation thereof will be omitted for the sake of convenience.

In this way, in the pickup feeding mechanism described above,
A rack gear 53 corresponding to the movement position of the pickup 32 is provided on a pickup mount 52 which is movably provided to support the pickup 32, and a worm gear 55 meshed with the rack gear 53 is rotationally driven. The rank gear 53 is driven to move the hookup 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 accuracy.

By simplifying the configuration of the transmission system, it is possible to promote miniaturization, and the number of parts is reduced, making it cheaper.

Now, with the disc loading completed as described above, the operating section 160 of the cabinet 11 (see FIG. 1) is operated to play the disc 33.

Then, the drive motor of the turntable (not shown) is moved to rotate the disk 33 mounted on the turntable 34 to a predetermined state, and also rotates the disk 33 mounted on the turntable 34 to a predetermined state. A laser beam is irradiated onto the signal recording surface of the disk 33 through the through hole 352 . This laser beam is applied to the disk 33
The light beam hits the signal recording surface 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 from which the digitally encoded signal is recorded on the disk 33 and 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
3 ends. Here, the above loading key 1
3 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 reaches the disk loading position shown in FIG. It is something that is frequently 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 power saving measures, 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 are perspective views showing the operating state of FIG. 2, FIG. 5 is a perspective view showing a part of FIG. 2, and FIGS. 6, 7, and 8 are perspective views of FIG. 2. ,
Diagonal 33 showing some details of Figures 3 and 4 - Parent view, Figures 9, 10 and 11 show other details of Figures 2, 3 and 4, respectively. Perspective view shown, 1st
2(a) and 2(b) are respectively plan views 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 is a plan view showing the operation of the clamper lever in FIG. 2. FIG. 15(a) is a perspective view showing the pickup mechanism of the
t(b) is 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 ... Clamper mechanism, 19... Disc playback mechanism section, 20... Tray, 21... Motor,
22... Drive gear, 23... Reduction gear for seedling 1, 24
...Second reduction gear, 25...Third reduction gear, 2
6... Fourth reduction gear, 27... Fifth reduction gear,
28... Lock mochi wheel, 29... First eccentric cam, 3
0... Second eccentric cam, 31... Lock member, 17
6...Rotating shaft, 177...Through hole, 32...Pick 34-up, 33...Disc, 34...Turntable, 35...Turnable disc, 36, 37... Guide member, 3
8...Fixed rack, 39...Movable arm, 40...
- Drive member, 41... protrusion, 42... switch,
43...Mounting member, 44...Shaft, 45...Cranno or one lever, 46...Cran/# part, 46.・
...Brim, 47...Spring, 48...Drive aL
/ Bar, 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...Pinching part, 60...
··spring. Applicant's representative Patent attorney Takehiko Suzue Figure 7 Figure 8 Figure 10 Figure 11 Figure 94 15 -412- (b)

Claims (1)

[Claims] In an optical disc record playback device comprising a loading mechanism for horizontally loading an optical disc and a crank mechanism for holding the disc in a horizontal position for playback with respect to a turntable, the loading mechanism is a first rack member that drives the clampers; a second rack member that drives the clampers and is slidably supported with respect to the first rack member; and the first and second rack members. The first one selectively applies a driving force to the first one and is configured to mesh together when switching.
and a second transmission gear system, and the teeth of the second front rack member at the meshing start position are cut out to prevent the first and second transmission gear systems from locking. An optical disc record playback device featuring: