JPS59135651A - Reproducing device of optical disk record - Google Patents

Abstract

PURPOSE:To attain simply and surely the control of high accuracy by providing the 1st rack member driving a loading mechanism, the 2nd rack member supported freely slidably to the 1st rack member and a notch part in response to the root of gear at the emshing start position of the 2nd rack member so as to prevent the 1st and 2nd transmission gear system from being locked. CONSTITUTION:The notch part 397 preventing locking due to meshing is formed to the vicinity of the root of gear of the 1st tooth part 393 from the root to a prescribed position. Further, the over-cut tooth part 398 preventing locking due to meshing is formed, where the tooth tip of, e.g., two teeth from the root is cut in an acute angle as shown in hatched lines in the 1st tooth part 393. Since the 1st tooth part 393 of a moving rack 39 is prevented from being locked because of simultaneous meshing of the 3rd and 5th reducer gears 25, 27 by means of the elasticity of the nothc part 397, overload to a motor 21 is prevented. The overload due to simultaneous meshing by delivering the torque of the motor 21 from the 3rd reducer gear 25 and a fixed rack 38 to the tooth part 393 of the moving rack 39 and the reducer gear 27 is prevented and smoother operation is attained.

Description

DETAILED DESCRIPTION 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 using PCM (pulse coat modulation) technology has appeared and is becoming popular in order to achieve as high fidelity as possible. This is what is called digital audio, and the principle is that the audio characteristics are far superior to conventional analog systems without depending on the characteristics of the recording medium. 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 its playback method is an optical one. Electrostatic type and mechanical type are known. Regardless of which of these playback methods is adopted, the playback device that embodies it must be able to satisfy various advanced functions and performances not found in conventional devices. required.

For example, in an optical disc record playback device that uses the CD (compact disc) method among optical playback methods, the digital (PCM)
) A metal thin film that forms pits (irregularities with different reflectances) corresponding to the conversion data is coated with a diameter of 12 saws and a thickness of 1.
Two optical discs are driven in a CLV (Constant Linear Velocity) system at variable rotational speeds of about 200-500 rpm. 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 to have each mechanical part operate reliably with an organic and simple configuration with no waste, to promote compactness and power consumption. The aim is to make further improvements by taking power-saving measures to reduce the amount of energy used.

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. 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 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 clamper mechanism for holding the disc horizontally so that it can be played on a turntable. a first rack member that drives the clamper mechanism; a second rack member that drives the clamper mechanism and is slidably supported with respect to the first rack member; and the first and second rack members. It selectively applies a driving force to the transmission gear system, and has first and second transmission gear systems configured to mesh together at the time of switching, and has a tooth base at the meshing start position of the second rack member. 5- The present invention is characterized in that a notch is provided correspondingly to the first and second transmission gear systems to prevent the first and second transmission gear systems from collapsing.

[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 disk record reproducing apparatus to which the present invention is applied, and numeral 1 indicates a cabinet. A DAD (hereinafter referred to as disk) loading mechanism section 12 is mounted on the front panel of this cabinet 11.
OATING ) Arrow A in conjunction with the operation of key 13.

It is provided in a so-called horizontal loading type that can be moved in and out in the B direction, and the disk is placed horizontally on the tray part and is carried in and installed approximately horizontally to the disk drive position for playback. This will be discussed 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; In the lower row, there are play key 6 (PLAY) for play operation, stop key (5TOP), next key (NEXT), fast forward key (F-F) for fast forward operation, and backward key for backward operation. key (BWD), pause key (PAUSE), REPEAT
).

An operating section 16 having a control panel and the like is arranged in parallel with 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 2 is installed near one end of the bottom surface.
1 is arranged. This motor 21 has a driving gear 22 coaxially provided on its rotating shaft 211, and this driving gear 22 has a first gear. Second. Third. Fourth and fifth reduction gears 2
3 to 27 are meshed sequentially.

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 28 inserted through both ends of a substantially concave mounting portion 175 formed in the mounting structure 17, and a first eccentric for lock driving is provided near both ends of the lock gear 28. A cam 29 and a second eccentric cam 30 for driving the crank/mother are 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 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 31 and the mounting portion 175, so that the locking member 31 is biased counterclockwise in FIG. .

On the other hand, the second eccentric cam 30 is connected to the first eccentric cam 2.
9, and first and second locking grooves 301 for the clamper lock are provided at the lowest and highest eccentric positions.
．． 302 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 pickup 32 and the hitisque 33 (indicated by the two-dot chain line in FIG. 2) is attached to the through hole 177, which will be described later. The disc playback mechanism section 19 is arranged at a predetermined angle with respect to the loading direction (one direction of arrows A and B9).

Further, the mounting structure 17 has the mounting portion 1 on the upper surface thereof.
A pair of support stands 178 and 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 201 corresponding to the disk 33 is formed approximately in the center of the tray 20.
A plurality of guide grooves 202 (only one location is shown in FIG. 4 for convenience of illustration) are formed at predetermined intervals on the inner circumferential wall of the through hole 201, each slanting downward. And the above-mentioned through hole 2
A rotary plate 35 on which the disk 33 is placed is installed at 01. This rotary disk 35 has the above-mentioned through hole 20 in its periphery.
A plurality of 10 protrusions 351 (only one location is shown in FIG. 4 for convenience of illustration) corresponding to the plurality of guide grooves 202 of 1 are formed at predetermined intervals. The protrusion 351 is guided by the plurality of guide grooves 202 and is freely rotatable in the direction of the clock and half-hour hand in the figure, and is also movable up and down.

Further, in the rotary disk 35, a laser irradiation through hole 352 located in the loading direction (that is, the direction of arrows A and B) before and during disk loading is formed from the center toward the outer circumference. 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 35 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, a pair of disc loading/unloading recesses 203, 204 and 353, 354 are provided in the tray 20 and rotating plate 35 so that they face each other before and during disc loading, respectively, as shown in FIGS. 2 and 3. It is formed. Among these, the concave portion 353.35 of the rotary disk 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,. 954, respectively.

Further, the tray 2o has guides t41 (materials 36 and 37 attached to the system interior 172 of the mounting structure 17, respectively) at both ends thereof.
It is formed so as to extend from one end thereof in correspondence with the above. These guide members 36 and 37 have guide groove portions 36) (for convenience of illustration, the guide member 37 is not shown) corresponding to each guide roller 173 and 174 of the guide portion 172 of the mounting structure 17. It is formed as follows. Therefore, the tray 20 is movable in the directions of arrows A and B as the guide grooves 361 of the guide members 36 and 37 are engaged with and guided by the rollers 173 and 174 of the guide part 172 of the mounting structure 17. There is.

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 from the upper surface at predetermined intervals. will be established.

- 10,000, 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 respectively formed in the guide holes 391 and 392. It has been inserted. 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 ridge 39 so as to protrude inward from the movable portion 39.
A pin 396 is formed at the tip. One end of a driving member 40(r) is rotatably supported by this pin 396, and the other end of this driving member 46 is rotatably supported by a pin 355 protruding from the rotary disk 35. Supported by

Also, as shown in FIG. 2 again, the tray 20 has four locking protrusions formed at its base end, and these protrusions have three locking members of the mounting structure 17. A lock bin 411 is formed corresponding to the lock groove 311.

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

That is, when the loading key 13 (see FIG. 1) is operated to mount the disc 33 on the turntable 34 in the state before disc loading (disc mounting position) shown in FIG. 2, the motor 21 is driven and the gear 2
2 is rotated counterclockwise in the figure. This rotational force is then transmitted to the first gear 22 through the gear 22. The signal is transmitted to the second, third, and fourteenth reduction gears 23 to 22. At this time, since the third reduction gear 25 meshed with the base end of the fixed rack 38 is rotated counterclockwise in the figure, the tray 2
0 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 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 removed from the first end of the movable rack 39. This movable rack 3 is meshed with the base end of the teeth 393.
The lock gear 28 is meshed with the second tooth portion 394 of 9. 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 drive member 40 is moved from the rotary plate 35.
Press the bottle 355. Therefore, the plurality of protrusions 35 of the rotary plate 35 are guided by the plurality of guide grooves 202 of the tray 20 and rotated counterclockwise in the figure, so that the rotary plate 35 is lowered. Here, the rotating disc 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.

- 10,000, when the movable rack 39 reaches the position shown in FIG. 10 from the position shown in FIG. The gear 28 is rotated counterclockwise in the figure. At this time, the first eccentric cam 29 of the lock gear 28 presses the sliding contact portion 312 of the lock member 3 and
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 bin 411 of the locking protrusion 4 of the tray 20, and when the tray 20 is in the disk loading completed state, When locked, 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, 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 the motor 21 is driven in reverse by a control circuit (not shown). be done.

Therefore, the loading mechanism section 12
3 is mounted on the turntable 34, the tray 20 is moved in the direction of the arrow A, and the second tray 20 is moved in the direction of the arrow A.
The mechanism 18 for holding 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 below. That is, as shown in FIG. 2 again, the mounting structure 1
The mounting member 43 is supported in a continuous manner on the support stand 178.1'llll of No. 7. And this mounting member 4
A shaft 44 is supported on the lower surface of the clamp lever 44 approximately in parallel with the mounting member 43 at the center thereof, and an intermediate portion of a clamper lever 45 is rotatably supported on the shaft 44. This clamper lever 45 has an extending portion 45 formed at its base end, and this extending portion 451 is inserted into four position regulating portions 179 formed in the mounting portion 175 of the mounting structure 17. . Further, the clamper lever 45 has a clamp A' portion 4 formed of a bottomed cylindrical magnetic material at its tip facing the turntable 34.
6 is supported with appropriate play. This crank t4 part 46 has a collar portion 461 formed at its tip to lock the vicinity of the hole in the disk 33, and its magnetic force allows the turntable 34 to be attached to the turntable 33 via the disk 33.
It is fitted into the fitting part 341 of.

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.

Also, the above Cranno J? A substantially concave drive lever 48 is rotatably supported at both ends of the shaft 44 supported by the lever 45. 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. Then, the drive lever 4
8 is a torsion spring 4 wound around the shaft 44.
One end of the torsion spring 49 is engaged, and the other end of the torsion spring 49 is engaged with the base of the crank 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. The lock gear 28 is engaged with the lock gear 28, and the lock gear 28 is rotated counterclockwise in the figure. Therefore, the second eccentric cam 3o, which is provided coaxially with the lock +'M wheel 28, is rotationally driven in the same direction. At this time, the second eccentric cam 30 was locked in the first lock groove 301. Engagement portion 48 of drive lever 48
1 is brought into sliding contact with the peripheral edge of the second eccentric cam 30, and is locked in the second lock groove 302 as shown in FIG. Therefore, as shown in FIGS. 12(a) and 12(b), the engaging portion 481 of the drive lever 48 is pressed against the peripheral edge as the second eccentric cam 300 rotates, and the driving lever 48 is rotated around the shaft 28. Rotated counterclockwise. 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 mentioned above, the rotary plate 3 of the tray 20
5 is rotated and lowered relative to the tray 20, the clamper portion 46 uses its magnetic force to clamp the disk 3.
3 is pressed against the turntable 34, and the mounting of the disk 33 onto the turntable 34 is completed here.

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

Here, FIG. 13 shows the first tooth portion 3 of the movable rack 39.
93 is shown in detail. That is, the first tooth portion 393 has a notch 397 formed in the vicinity 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 and locking formed at an acute angle as shown by diagonal lines in the figure at the tip of two teeth from its base end.

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 becomes fixed at approximately the same time. The third reduction gear 25 is removed from the tip of the 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. This will promote power saving measures.

The first tooth portion 393 of the movable ridge 39
By forming the notched tooth portion 398 in the above-described manner, 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 tooth portion of the movable rack 39. This prevents an overload condition due to simultaneous meshing when shifting to 393, allowing smooth operation and promoting power saving measures.

22- Then, as described above, when the tray 20 reaches the disk drive position and stops, the movable rack 39 is driven by the fifth reduction gear 27, and the locking member 28 is operated to move the tray 20 to the disk drive position. It is designed to lock in the 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 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.

Then, as described above, the clamper mechanism 18
0 reaches the disk drive position and is stopped, the fifth reduction gear 27 is connected to the lock gear 28 via the movable rack 39.
When the disc 33 is driven, a cranometer 45 is operated to press the disk 33 against 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 crannow 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 in pressure contact with the turntable 34.

Therefore, the disk 33 can be easily and reliably attached to and removed from the turntable 34 in a predetermined state, and the crank/mother 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 the third and fifth reduction gears 25.2 having different reduction ratios, to which the driving force from the same power source is transmitted in series.
7 was used to satisfy the requirements. Therefore, the configuration of the loading drive system is simple and inexpensive, and
The operation of each part can be reliably and smoothly controlled.

1. The fixed rack 38 and the movable rack 39 use third and fifth reduction gears 25 and 27 having different reduction ratios of the same drive system, respectively, to control the operation of each part,
Moreover, these third and fifth reduction gears 25, 27 and the first rotating portions 393 of the fixed rack 38 and 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
Laser illumination of the rotary plate 35 on which the disk is placed -25 = The through hole 352 for the elbow is set approximately in the loading direction at the disk mounting position, and is tilted at a predetermined angle with respect to the loading direction when the loading is completed. It was configured to allow

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 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 5° in its through hole 177. 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 26 is formed in this mounting body 50.
The pickup 3 is connected to the pickup 1 via the pickup mounting base 52.
2 is arranged. Here, when the disk loading is completed, the rotary disk 35 (see FIG. 4) is rotated and lowered as described above, so that the pickup 32 is inserted into the through hole 352 of the rotary disk 35 for laser irradiation. Correspondingly, it is disposed at a predetermined angle with respect to the loading direction and is movable in the directions of arrows C and D. The pickup 32 irradiates and receives a laser beam onto the disk 33 during its movement process, and for example, in the playback state, a pickup feeding mechanism (to be described later) moves the inner peripheral portion of the disk 33 along the through hole 50. It is moved at a predetermined speed toward the outer periphery.

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

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. This guide support part 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.
3.524, they are rotatably supported by bearing portions 512.513 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 is coaxially provided, and a drive gear 57 is meshed with this transmission gear 56. The drive gear 57 is coaxially provided with a rotating shaft 581 of a pickup feed motor 58 installed on the lower surface of the mounting body 5θ, and is configured to transmit the rotational force of the motor 58 to the transmission gear 56. is being done.

On the other hand, the pick-up mounting base 52 has a sandwiching portion 59 formed at the other end thereof for pinching and guiding the vicinity of the peripheral edge of the through hole 501 of the mounting body 50.

This sandwiching 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 50.
It has the following.

That is, in order to move the pickup 32 in the direction of arrow C in the big 29-up feed mechanism configured as described above, 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 elastic toothing engagement with the rack gear 53 of the pickup mount 52, the pickup mount 52 is connected to the worm gear 55.
It is linearly driven in the direction of arrow C as it rotates. Therefore, the pickup mounting base 52 is guided by the guide support portions 521 and 522 through which the guide rod 54, which is the center of rotation of the worm gear 55 and the transmission gear 56, and the sandwiching portion 59 move together with the pickup 32 in the direction of arrow C. It will be moved to

When the pickup 32 is to be moved in the direction indicated by the arrow, the motor 58 is reversed (30), thereby eliminating an operation substantially opposite to the movement in the direction indicated by the arrow, and moving the pickup 32 in the direction indicated by the arrow. Therefore, its explanation will be omitted here for the sake of convenience.

In this manner, 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.
By rotationally driving the worm gear 55 meshed with the rack gear 53, the rack gear 53 is driven and the pickup 32 is moved in a straight spinning manner. Therefore, the configuration of the transmission system can be simplified, and the pickup 32 can be easily and reliably controlled with high precision. Also, by simplifying the configuration of the transmission system, downsizing can be promoted. In addition, the number of parts is reduced and the cost is reduced.

Now, with the disc loading completed as described above, the play key (see FIG. 1) of the operating section 160 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, 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 to the disk 3 by the pickup feeding mechanism.
The reproduction of the disc 33 is completed after the disc 33 is moved from the inner circumference to the outer circumference of the disc 33. Here, when the loading key 13 is operated again, the disc 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 disc loading position shown in FIG. 2. However, the disk 33 is attached and detached here.

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, and FIG. 2 is a perspective view showing the disc loading mechanism and disc playback mechanism shown in FIG. 3 and 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 respectively 33 - Perspective views showing some details of Figures 2, 3 and 4; Figures 9, 10 and 11 are other parts of Figures 2, 3 and 4, respectively; Perspective view showing details, Figure 12 (a
) and (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 pickup mechanism in Fig. 2. Perspective views taken out and shown in Figures 15(a) and 15(b)
) are a plan view and a cross-sectional view showing some details of FIG. 14, respectively. DESCRIPTION OF SYMBOLS 11... Cabinet, 12... Rope ink mechanism part, 13... Loading key, 14... Power key, 15... Display part, 16... Operation part, 12... 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, 2
6... Fourth reduction gear, 27... Fifth reduction gear,
28... Lock gear, 29... First eccentric cam, 3
0... Second eccentric cam, 31... Lock member, 34
- 176...Rotation axis, '99. , +t・Through hole, 32
...Pickup, 33...Disc, 34...
Turntable, 35... Turntable, 36.37...
Guide member, 38, I, fixed rack, 39, movable rack, 40, drive member, 41, protrusion, 42,...
・Switch, 43...Mounting member, 44...Shaft, 45
... Clamper lever, 46 ... Clamper part, 4
61... Boxwood part, 47... Spring, 48...
Drive lever, 49... Torsion spring, 50.
... Mounting body, 51... Screw, 52... Kick-up mounting base, 53... Rack gear, 54... Guide rod, 5
5... Worm gear, 56... Transmission gear, 57...
・Drive gear, 58... Motor, 59... Sandwiching part, 6
0...Spring. Applicant's Representative Patent Attorney Takehiko Suzue Figure 7 Figure 8 Figure 7 Figure 10 Figure 11 J! :+4 Ii15 -332- (b)

Claims (1)

[Claims] In an optical disc record playback device comprising a loading mechanism that horizontally loads an optical disc and a clamper mechanism that holds the disc horizontally so that it can be played on a turntable, a first drive mechanism that drives the loading mechanism a second rack member that drives the crank/river mechanism and is slidably supported with respect to the first rack member; It selectively applies a driving force, and has first and second transmission surfaces configured to contact each other at the time of switching, and corresponds to the starting position of the tube metal of the second rack member. to provide a notch, and the first
and an optical disc record reproducing device characterized in that locking of the second transmission vehicle system is prevented.