JPS59135650A - Reproducing device of optical disk record - Google Patents

Abstract

PURPOSE:To attain simply and surely the control of high accuracy with simple constitution by clamping a disk loaded to a turning tray supported freely turnably in interlocking with the going and coming of the tray main body to a turntable so as to be reproduced in interlocking with the going and coming of the tray main body or releasing the clamp. CONSTITUTION:When the tray 20 comes to a stop by reaching a dik drive position, a turing disk 36 is descended while being turned to the tray 20 in interlocking with the driving of a moving rack 39 by a reducer gear 27 so as to hold the disk 33 onto the turntable 34 and a through-hole 352 of a turning disk 35 is opposed to an orbit of a pickup 32. When the tray 20 comes to a stop by being arrived at the disk drive position, a clamper lever 45 of a clamper mechanism 18 is operated by driving a lock gear 28 by a reducer gear 27 via the moving ack 39 and the disk 33 is pressed into contact onto the turntable 34.

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 T)AD (digital audio disc) system.

[Technical background of the invention and its problems]

Recently, in the field of audio equipment, a digital recording and playback method using PCM (pulse coat modulation) technology has appeared and is becoming popular in order to achieve as high fidelity as possible.In other words, this is digital audio. This is because it has been established in principle that the audio characteristics do not depend on the characteristics of the recording medium and are far superior to conventional analog systems. be. In this case, a system that uses a disk as a recording medium is called a DAD system, and optical, electrostatic, and mechanical playback methods are known. 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.
A metal thin film is coated to form bits (irregularities with different reflectances) corresponding to the conversion data, and the diameter is 12 cm and the thickness is 1.
Two optical discs are driven at variable rotational speeds of about 200 to 500 r, p, m by CLV (constant linear velocity) method. 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 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 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 loading mechanism for horizontally loading an optical disc and a clamper mechanism for holding the disc horizontally so that it can be played on a turntable. The mechanism includes a tray body which is installed horizontally so that it can be moved in and out, and a rotating tray that is rotatably supported to move up and down in conjunction with the movement of the tray body in and out of the tray body. The clamper mechanism is rotatably supported in conjunction with the insertion and removal states of the tray main body, and presses the disc placed on the rotating tray in the inserted state onto the turntable. On the other hand, it is characterized by having a clamper member that clamps reproducibly and releases the clamp in the extended state.

[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. A DAD (hereinafter referred to as disk) loading mechanism section 12 is mounted on the front panel of this cabinet 1.
The disc drive 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 OATING) key 13, and the disc is placed horizontally on the tray section for playback. It is carried in and installed approximately horizontally in the position, and the detailed training will be described later.

Note that the first factor 14 is an IT source 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 structure section 12, and this display section The lower row of 15 includes a play key (PLAY) for play operation, a stop key (5TOP), a next key (NEXT), a first forward key (F, F) for fast forward operation, and a backward key for bank word operation. (BWD).

Bose key (PAUSE), repeat key (REPE)
An operating section 16 having a control panel (AT), etc. 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. In FIG. 2, reference numeral 17 denotes an approximately inverted concave mounting structure 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, 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 173 and 174 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 21.
2 has the 1st. Second. Third. Fourth and fifth reduction gears 23
0 to 22 are sequentially meshed, and the mounting structure 1
A lock gear 28 for locking, which corresponds to the fifth reduction gear 27, is installed at one end of the base end of the upper surface of the gear 7.

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 30 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 28, 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 of the locking member 3 and the mounting portion 175, so that the locking member 3 is biased in the counterclockwise direction in the drawing. There is.

On the other hand, the second eccentric cam 30 is connected to the first eccentric cam 2.
9, and has first and second locking grooves 30 for the clamper lock at the lowest and highest eccentric positions.
1.302 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 inserted through the hole of the pickup 32 and the disk 33 (indicated by double dotted lines in FIG. 2) is attached to the through hole 177, which will be described later. The disc playback mechanism section 19 moves in the loading direction (direction of arrows A and B).
It is arranged at a predetermined angle with respect to the

Further, the mounting structure 17 has the mounting portion 1 on the upper surface thereof.
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 12 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 20 corresponding to the disk 33 is formed approximately in the center of the tray 20, and a plurality of guide grooves 20 are formed at predetermined intervals on the inner peripheral wall of the through hole 201.
02 (only one location is shown in FIG. 4 for convenience of illustration) are formed to be inclined downward. And the above-mentioned through hole 20
A rotary plate 35 on which the disk 33 is placed is installed. This rotary plate 35 has a plurality of ′′ corresponding to the plurality of guide grooves 202 of the through hole 20 on its peripheral edge, and a protrusion 35 (only one location is shown in FIG. 4 for convenience of illustration) in a predetermined manner. The plurality of protrusions 351 are guided by the plurality of guide grooves 202 with respect to the tray 20, and are freely rotatable in the clockwise and half-hour directions in the figure, and are also vertically movable.

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. This through hole 352 is inserted into the rotary disk 3 as shown in FIG. 4 after the disk is loaded.
5 is guided by the plurality of guide grooves 202 with its plurality of protrusions 351 and is rotated counterclockwise in the figure and lowered, so that it is tilted at a predetermined angle with respect to the loading direction. The details of the 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, 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 35 of the rotary plate 35
4 is the rotary plate 3 relative to the tray 2o as described above.
5 is rotated counterclockwise in the figure after disk loading, the recess 3 of the tray 20 as shown in FIG.
53 and 354, respectively, are separated by t.

The tray 2o also includes guide members 36 at both ends thereof.
37 is formed with one end thereof extending in correspondence with the guide portion 172 of the mounting structure 17 (n-5n).

These guide members 36 and 37 have guide grooves 36 and 37, respectively.
1 (the direction of the guide member 37 is not shown for convenience of illustration) is formed in contrast to each guide roller 173, 174 of the guide portion 172 of the mounting structure 17.

Therefore, the tray 2o is movable in the directions of arrows A and B with the guide grooves 361 of the guide members 36 and 37 engaging and guided by the rows 2173 and 174 of the guide portion 172 of the mounting structure 17. There is.

Here, a fixed rank 38 for loading drive and a movable rack 39 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 12, and has guide pins 381 and 382 protruding from the upper surface at a predetermined interval. will be established.

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 pins 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, 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. One end of the drive member 40 is rotatably supported by this pin 396, and the other end of the drive member 46 is rotatably supported by a pin 355 protruding from the rotary disk 35. be done.

Further, as shown in FIG. 2 again, a locking protrusion 41 is formed at the base end of the tray 20, and this protrusion 41 is provided with a lock for the locking member 3 of the mounting structure 17. A lock pin 411 is formed corresponding to the groove 311.

Here, the operation of the loading mechanism section 12 configured as shown in -h will be described in detail.

That is, when the loading key 13 (see FIG. 1) is operated in the state shown in FIG. 2 before disc loading (disc mounting position) in order to mount the disc 33 on the turntable 34, the motor 2 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 dentition 25 mated to the proximal end of fixed rack 38
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 detached from the tip of the fixed rank 38, and at this time, the fifth reduction gear 27, which is further decelerated and super-moved in the same direction, is removed from the first tooth portion 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 is 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. For this reason, the plurality of protrusions 351 of the rotary plate 35 correspond to the plurality of guide grooves 200 of the tray 20.
It is lowered while rotating counterclockwise in the figure. Here, the rotary plate 35 has a through hole 35 for laser irradiation.
2 indicates the feeding direction of the pickup 32 (the details of which will be described later).
In other words, it corresponds to 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 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 3, and the lock member 3 resists the biasing force of the spring 60 and rotates against its rotation shaft 17.
6 in the counterclockwise direction in the figure. Therefore, the locking groove 311 of the locking member 31 shown in FIG. At the same time, the protrusion 282 provided on the rotating shaft 281 turns off the switch 42 and stops 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 20 in the direction of arrow A by performing an operation substantially opposite to that when loading the disc 33 on the turntable 34 to reach the disc loading position shown in FIG. 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
The mounting members 43 are supported in a connected manner on the support stands 118 and 178. 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, and the intermediate portion of the clamper lever 45 is rotatably supported on this shaft 44VC. This clamper lever 45 has an extending portion 451 formed at its base end, and this extending portion 451 is connected to the mounting portion 17 of the mounting structure 17.
In addition, the two-member lever 45 has a clamper formed of a magnetic material in a cylindrical shape with a bottom at its tip facing the turntable 34. Part 46 is supported with appropriate play. This clamper portion 46 has a collar portion 461 formed at its tip that locks the vicinity of the hole in the disk 33, and is fitted into the fitting portion 341 of the turntable 34 via the disk 33 due to its magnetic force. It is something that

Note that a spring 47 is engaged between the tip of the clamper lever 45 and the mounting member 43,
The elastic force of the spring 47 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 two-member lever 45 mentioned above. That is, as shown in FIG. 9, this drive lever 48 has a proximal end thereof that slides into contact with the second eccentric cam 30 and has first and second lock grooves 301 and 302 of the second eccentric cam 30. A retaining portion 48 for selectively locking 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. 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 two claws 39 reach the position shown in FIG. 10 from the position shown in FIG. 9, and the second tooth portion 394 is locked. 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 is moved by sliding the engaging portion 481 of the drive lever 48, which is locked in the first lock groove 30, against the peripheral edge of the second eccentric cam 30. The first
As shown in FIG. 1, it is locked in the second lock groove 302. 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 of the shaft 28 as the second eccentric cam 30 rotates. It is rotated counterclockwise in the figure around the center. Here, as the drive lever 48 rotates, the clamper lever 4
5 in the same direction to fit the clamper portion 46 of the clamper lever 45 into the fitting portion 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 attachment of the disk 33 to 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 two claws 39 are moved in the direction of arrow A. Therefore, since the lock gear 2B is reversed, the drive lever 48 and the clamper lever 45 perform an operation substantially opposite to the above-mentioned clamping operation to return each 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 of the root thereof from the base end to a predetermined position to prevent meshing and locking. The tenth tooth portion 393 has, for example, a notched tooth portion 398 for preventing engagement and locking, 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 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. is promoted.

Further, the first tooth portion 39 of the movable rack 39 is
By forming the notched 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 rack 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 2o reaches the disk drive position and stops, the movable rack 39 is driven by the fifth reduction gear 22, and the locking member 28 is operated to drive the tray 20 to the disk drive position. It is designed to lock in position. Therefore, for example, when the disc 33 is being played back, the tray 20 is reliably locked at the disc drive position, which prevents erroneous operation and improves safety.

Furthermore, when the tray 20 reaches the disk drive position and is stopped, the movable rack 39 is driven by the reduction gear 27 of M5, and the rotation m35 rotates relative to the tray 20 in conjunction with this. The disc 33 is held by the turntable 34 while being lowered, and the through hole 352 of the rotating disc 35 is made to face the track of the pickup 32. For this reason, 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 is often used in the I'' shape of the device itself. It is something that contributes to the future.

Then, as described above, the clamper mechanism 18
0 reaches the disk drive position and is stopped, the fifth reduction gear 27 is moved to the locking table 28 via the movable rack 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.

Further, in the above-mentioned clamper mechanism 18, the clamper part 46 moves the disk 33 onto the rotary plate 35 of the tray 20.
The disk 33 is attached to and detached from the turntable 34 by raising and lowering the rotary disk 35 while being tangential to 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 rimper 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.
'l 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, the structure is such that the third and fifth reduction gears 25.2'l and the first tooth portions 393 of the fixed rack 38 and the movable two gears 39 are engaged with each other at the same time so that the transmission forces are transferred to each other. By doing so, 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 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. .

Therefore, 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 determined by the shapes of the disk 33 and the pickup 32 is By configuring the through hole 352 to be inclined with respect to the loading direction as described above, the shape thereof can be made small, thereby promoting miniaturization of the device.

Next, the disc playback mechanism section 1g that plays back the disc 33 will be explained. As shown in FIGS. 2 and 5 again, the mounting structure 12 has a substantially plate-shaped mounting body 5° in its through hole 177. is screwed in with a screw 5) 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, the pickup 32 is inserted into the laser irradiation through hole 352 of the rotary plate 35 because the rotary plate SS (see FIG. 4) is rotated and lowered as described above with the disc loading completed. 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 movement process, and for example, in the playback state, the pickup 32 moves from the inner circumference to the outer circumference of the disk 33 along the through hole 501 using a pickup feeding mechanism (described later). It is moved at a predetermined speed toward the

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 motor for driving the turntable 1 (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 to be rotationally driven to a predetermined state by.

Here, FIG. 14 shows a pickup feeding mechanism for moving the pickup 32 in a predetermined direction. That is, the pickup mounting base 52 has an elastic rack gear 53 (see FIG. 15) formed at one end thereof, and a pair of guide support parts 521 and 522 sandwiching the rack gear 53. A protruding support plate 520 is attached. This guide support part 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 these guide 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 52.
3 and 524, they are rotatably supported by bearing portions 512 and 518 formed on the mounting body 5o, respectively. One end of the guide s54 is connected to the bearing portion 512.
．． After one of the transmission gears 513 is inserted, the transmission gear 56 is further inserted.
are provided coaxially, and a drive gear 57 is meshed with this transmission gear 56.

This drive gear 57 is coaxially provided with a rotating shaft 58 of a pickup feeding motor 58 installed on the lower surface of the mounting body 5o, and is configured to transmit the rotational force of the motor 58 to the transmission gear 56. being done.

On the other hand, the pick-up mounting base 52 is formed at its other end with a clamping portion 5g that clamps and guides the vicinity of the peripheral edge of the through hole 501 of the mounting body 5o.

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.

That is, in order to move the pickup 32 in the direction of the arrow C in the pickup feed it configured as described above, the motor 58 is driven counterclockwise in the drawing, for example, and the drive straight wheel 57 is rotationally driven in the same direction. Then, the drive gear 57 rotates the transmission gear 56 clockwise in the drawing, and rotates and removes the worm gear 55, which is coaxially provided via the transmission end wheel 56 and the guide rod 54, in the same direction.

At this time, this worm gear 55 or the pickup mounting base 5
The pick amplifier mounting base 52 is linearly driven in the direction of arrow C as the worm wheel 55 rotates due to its elastic meshing relationship with the second rack gear 53. Therefore, the pickup mounting base 52 is guided by the guide support portions 521 and 522 and the clamping portion 59 through which the guide rod 54, which is the rotation center of the worm gear 55 and the transmission gear 560, is passed through, and is moved together with the pickup 32 in the direction of arrow C. Furthermore, when moving the pickup 32 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. The explanation thereof will be omitted here for the sake of 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 pickup 3 is rotated.
2 was configured to move 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 disc loading completed as described above, the play key (see FIG. 1) of the operating section 16 of the cabinet 11 is operated to play the disc 33.

Then, the turntable drive motor (not shown) is driven and the disc 3 mounted on the turntable 34 is driven.
3 to a predetermined state, and the through hole 35 formed in the rotary plate 35 of the tray 20 from the pickup 32
A laser beam is irradiated onto the signal recording surface of the disk 33 via the laser beam 2. 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 and generates an electrical signal according to the intensity. 0, from which the digitally encoded signal is recorded on the disk 33 and taken out. Then, the pickup 32 is moved to the disk 3 by the pickup feeding mechanism.
The loading key 13 is moved from the inner circumference to the outer circumference of the disc 33 and the playback of the disc 33 is completed.
When the 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 mounting position shown in FIG. It is something that can be 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 the drawing]

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. Fig. 4 is a perspective view 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 respectively Figure 2,
A perspective view showing some details of FIGS. 3 and 4, No. 91. Figures 10 and 11 are Figures 2, 3, and 4, respectively.
Side view showing some other details of the figure, Fig. 12(a) +
(b> is a plan view showing one part 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 pickup mechanism in Fig. 2. T perspective view taken out and shown in Figure 15 (a), (b>at
FIG. 15 is a plan view and a sectional view showing some details of FIG. 14, respectively. 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, z 9 ... Disc playback machine handle, 20 ... Tray, 21 ° ° Motor, 22 ... Drive gear, 23 ... First reduction gear, 2
4... second reduction gear, 25... third reduction gear,
26... Fourth reduction gear, 27... Fifth reduction gear, 28... Lock gear, 29... First eccentric cam,
30... Second eccentric cam, 31... Lock member, 1
76...Rotating shaft, 177...Through hole, 32...Bitter up, 33...Disk, 34...Turntable, 135...Rotating plate, 36.37...Guide 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, 46...・
-Brim part, 47...Spring, 48...Drive lever, 49...Torsion spring, 5o...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. Applicant's representative Patent attorney Takehiko Suzue Figure 7 Figure 8 Figure 10 Figure 11 J':34 Figure 15-316- (b)

Claims (1)

[Claims] In an optical disc record playback device comprising a loading mechanism for horizontally loading an optical disc and a clamper mechanism for holding the disc in a horizontal position for playback on a turntable, the disc loading mechanism is horizontally mounted. It has a tray body that is provided to be able to come in and out, and a rotary tray that is rotatably supported to be vertically movable in conjunction with the tray body being moved in and out of the tray body and is used for placing the disk, and the clamper The mechanism is rotatably supported in conjunction with the loading/unloading state of the tray main body, and reproducibly clamps the disc placed on the rotating tray to the turntable while pressing the disc against the rotating tray in the loaded state. An optical disc record playback device comprising a clamper member that releases the clamp in the extended state.