JPS59215066A - Optical disc record reproducing device - Google Patents

Abstract

PURPOSE:To prevent locking of the 1st and 2nd transmission gear systems by providing independently turnably with each other the 1st and 2nd transmission gear systems driving selectively the 1st and 2nd rack members of a disc loading mechanism and the 1st and 2nd gears of the 3rd transmission gear system. CONSTITUTION:A gear 26B having a larger diameter of a reduction gear 26A driven by a gear 25 driving a fixed rack 38 of a tray 20 of the disc loading mechanism 12 is engaged with the gear 25 and a gear 26C having a smaller diameter is engaged with a gear 27 driving a moving rack 39 of the tray 20. Although the gear 25 is removed from the tip of the fixed rack 38 in driving it toward the arrow B, since the gear 27 is engaged with a tooth 393 of a moving rack 39, some simultaneous meshing takes place. Since the load torque due to simultaneous engagement is absorbed by a spring member 26I inserted between the gears 26B and 26C, the gear locking due to simultaneous engagement is prevented surely.

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 using PCM (Hulls Court Modulation) technology has appeared and is becoming popular, in an effort to achieve as high fidelity as possible. In other words, this is called digital audio, and the principle is that the audio characteristics do not depend on the characteristics of the recording medium and are far superior to the conventional analog system. 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.
Optical, electrostatic, and mechanical methods are becoming known as playback methods. Regardless of which of these regeneration methods is adopted, the regeneration device that embodies it must be able to satisfy a variety of advanced functions and performance that are not found in conventional methods. required.

For example, in an optical disc record playback device that uses the CD (compact disc) method among optical playback methods, the digital (PcM)
) An optical disc with a diameter of 12 cnI and a thickness of 1.2 cm, which is coated with a thin metal film that forms bits (irregularities with different reflectances) corresponding to converted data, is converted into a CLV (constant linear velocity) system. It is driven at a variable rotational speed of approximately 200 to 500 r, p, m. In this case, this disc has a track pitch of 1.6 μm and contains a huge amount of information that can last about an hour of stereo playback on one side, and it also has various advanced functions and features. It is easy to see that performance is required.

The next requirements for the above-mentioned optical disc record playback device are that each mechanical part can operate reliably with an organic and simple structure with no waste, and that it can also be miniaturized while consuming The aim is to further improve the system by taking power-saving measures to reduce power consumption.

Incidentally, one of the specific targets of such a request is a disk loading mechanism. There are two types of disc 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]

This invention was 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 provide and.

[Summary of the invention]

That is, the present invention provides an optical disc reflex-1 reproducing apparatus comprising a loading mechanism for horizontally loading an optical disc and a clamper mechanism for holding the optical disc in a horizontal position for playback with respect to a turntable. a first rack member that drives the loading mechanism; a second rack member that drives the clamper mechanism and is slidably supported with respect to the first rack member; first and second transmission gear systems that selectively apply driving force to the second rack member and are configured to mesh together at the time of switching; and a third transmission gear system having first and fifth-second gears coupled together, the first and second gears of the third transmission gear system being rotatable independently of each other. The invention is characterized in that it is configured to prevent the first and second transmission gear systems from locking.

[Embodiments of the invention]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Before describing one embodiment of the present invention, a basic example of a CD-type optical disc load reproducing apparatus to which the present invention is applied will be described in detail with reference to the drawings. That is, FIG. 1 shows the appearance of a CD-type optical disc record playback device, which is the basis of the invention.
is a cabinet. And this cabinet 11
A DAD (hereinafter referred to as disk) loading mechanism section 12 is installed in the front panel 111 of the front panel 111 for loading (LOAD).
ING) The disc is provided in a so-called horizontal loading type that can be moved in and out in the directions of arrows A and B in conjunction with the operation of the key 13, and the disc is placed horizontally on the tray section for playback. It is carried in and installed approximately horizontally in the driving position, and details will be described later.

Reference numeral 14 in FIG. 1 is a power key that is operated prior to operating the loading key 13. Hereinafter, a display section 15 is disposed on the upper right side of the loading mechanism section 12, and the display section 15 is At the bottom, there is a play key (PLAY) and a stop key (5TOP) for play operation.
, next key (NEXT), first forward key (F, F) for fast forward operation, backward key (BwD) for pack word operation, PAUSE, repeat key (REPEAT)
), etc. is the loading key 13.
are arranged in parallel.

Here, FIG. 2, FIG. 3, and FIG. 4 respectively show the states of the loading mechanism section 12 before, during, and after disk loading. First, in FIG. 2, reference numeral 17 denotes a mounting structure having a substantially inverted concave shape to which the loading mechanism section 12 including the crankshaft mechanism 18, the disk 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 thereof. This motor 2 has a driving gear 22 coaxially provided on its rotating shaft 211).
The first thing is. Second. Third. The fourth and fifth reduction gears 23 to 27 are sequentially meshed.

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.

The lock gear 28 has its rotating shaft 281 inserted through both ends of a substantially concave mounting portion 175 formed in the mounting structure 17, and first eccentric cams 29 for lock driving are located near both ends of the mounting portion 175. and clan/? - A second eccentric cam 30 for driving is provided coaxially. 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. The 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.

The locking member 3 is provided with a spring (not shown in FIG. 5 for convenience) between its base end and the mounting portion 175.
is engaged 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 301 for the clamper lock are provided at the lowest and highest eccentric positions.
．． 302 is formed.

Incidentally, the mounting structure 17 has a through hole 177 formed at approximately the center of its upper surface. The pickup 32 and disk 33 (second
The disc playback mechanism section 19 (to be described later) has a fitting part 341 that is inserted through a hole shown in the figure (indicated by a two-dot chain line) to which a turntable 34 and the like is attached.
, direction B) at a predetermined angle.

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 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 20 corresponding to the disk 33 is formed approximately in the center of the tray 20.
A plurality of guide grooves 202 (for convenience of illustration, only one location is shown in FIG. 4) are formed on the inner peripheral wall of the through hole 201 at predetermined intervals of 10 mm, each slanting downward. A rotary plate 35 on which the disk 33 is placed is installed in the through hole 20. A plurality of protrusions 351 (only one location is shown in FIG. 4 for convenience of illustration) corresponding to the plurality of guide grooves 202 of the through-hole 201 are formed at predetermined intervals on the peripheral edge of the rotary disk 35. 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. The through hole 352 is inserted into the rotary disk 3 as shown in FIG. 4 after the disk is loaded.
5 connects the plurality of protrusions 351 to the plurality of guide grooves? Since it is guided by ρp and rotated counterclockwise in the figure and lowered, it is tilted at a predetermined angle with respect to the loading direction, and the details of its drive system will be described later.

Here, the tray 2θ and the rotary plate 35 have a pair of recesses 203, 204 and 353, 354 for disc loading and unloading 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 portions 353 and 354 of the rotary disk 35 are
As mentioned above, the rotary plate 35 is moved relative to the tray 2θ.
After loading the disc, which is rotated counterclockwise in the figure, the concave portion 3 of the l-lay 2o as shown in FIG.
53.354, respectively.

The tray 2o also has guide members 36 at both ends thereof.
37 are formed extending from one end thereof, corresponding to the guide portions 172 of the mounting structure 17, respectively. In these guide members 36 and 37, guide groove portions 36 (for convenience of illustration, the guide member 37 is not shown) correspond to the guide rollers 173 and 174 of the guide portion 172 of the mounting structure 17, respectively. It is formed as follows. For this reason,
The tray 20 has guide grooves 361 of its guide members 36, 37, and rollers 1 of the guide portion 172 of the mounting structure 17.
It is engaged and guided by 73 and 174 and is movable in the directions of arrows A and B.

Here, a fixed rack 38 for driving loading and a movable groove 39 are stacked on the lower surface of one side of the tray 20, as shown in FIG. 6. That is, the fixed rack 38 is formed on the lower surface of the tray 2o in correspondence with the third reduction gear 25 of the mounting structure 12, and the fixed rack 38 is formed on the upper surface thereof with guide bins 3 arranged at predetermined intervals.
81.382 is provided protrudingly.

On the other hand, guide holes 391 and 392 are formed in the movable rack 39 disposed on the upper surface of the fixed rack 38, and guide 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 described in above 13-1 has a first part at its tip, which will be described in detail later.
The tooth portion 393 is the fifth reduction gear 27 of the mounting structure 17.
A second tooth portion 394 is formed at the proximal end thereof to correspond to the lock gear 28 . The movable rack 39 also has a movable section 3 at its tip.
95 is formed to protrude inward, and a bottle 396 is formed at the tip of this movable portion 395. One end of the drive member 40 is rotatably supported by the bin 396, and the other end of the drive member 46 is rotatably supported by the bin 355 protruding from the rotating disc 35. Ru.

Further, as shown in FIG. 2 again, a locking protrusion 41 is formed at the base end of the tray 2°, and this protrusion 41 has a locking groove of the locking member 31 of the mounting structure #J7. A lock bin 411 is formed corresponding to 311.

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

That is, in the state before disk loading (disk device position) shown in FIG.
When the loading key 13 (see FIG. 1) is operated with the device mounted on the turntable 34, the motor 21 is driven and the gear 22 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. At this time, the third reduction gear 25 meshed with the base end of the fixed rack 380 is rotationally driven in the counterclockwise direction in the figure, so that the tray 20 is moved most in the direction of arrow B (disk drive position) as shown in FIG. K is transferred and the 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 first reduction gear 27 of the movable rack 39.
The lock gear 28 is meshed with the base end of the toothed portion 393 of the movable rack 39, and the lock gear 28 is meshed with the second toothed portion 394 of the movable rack 39. The movable rack 39 is the fifth movable rack.
is moved to the position shown in FIG. 8 by the reduction gear 27. At this time, the movable rack 39 has its movable portion 395
is moved in the direction of arrow B, causing the drive member 40 to press the bin 355 of the rotary plate 35. For this reason, the rotating plate 3
5 is lowered with its plurality of protrusions 351 being guided by the plurality of guide grooves 202 of the tray 20 and rotating counterclockwise in the figure. Here, the rotary disk 35 has a through hole 352 for laser irradiation that corresponds to the feeding direction (that is, the direction of arrows C and D) of the big roller f32, which will be described in detail later.

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 four-wheeled gear 28 presses the sliding contact portion 312 of the locking member 31 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.
The tray 20 is locked in the lock bin 41 when the disk loading is completed, and the protrusion 282 provided on the rotation shaft 281 is engaged with the switch 42.
is turned off to stop the motor 21.

Further, as shown in FIG. 4, in order to take out the disc 33 with the disc 33 mounted on the turntable 34, when the loading key 13 is operated, the motor 21 is driven in reverse by a control circuit (not shown). be done. For this reason, the loading mechanism section 12 moves the tray 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. It is.

Here, the clamp 17-par mechanism 18 that holds the disc 33 in pressure contact with the turntable 34 in a state where the disc loading has been completed as described above will be described. That is, as shown in FIG. 2 again, the support base 1'18.
A mounting member 43 is supported in a connected manner.

A shaft 44 is supported on the lower surface of the mounting member 43 at a substantially central portion thereof and substantially parallel to the mounting member 43, and a middle portion of a clamper lever 45 is rotatably supported on the shaft 44. be done. Clan) J? - The lever 45 has an extending portion 451 formed at its base end, and the extending portion 45 is inserted into a position regulating recess 179 formed in the mounting portion 125 of the mounting structure 17. . The clamper lever 45 also has the turntable 3 attached to its tip.
Clamp 17 formed of a cylindrical magnetic material with a bottom and facing 4.
The portion 46 is well supported with appropriate play.

This clamper portion 46 has a collar portion 461 formed at its tip to lock the vicinity of the hole in the disk 33, and due to its magnetic force, it is attached to the fitting portion 341 of the turntable 34 via the disk 33. K is made 18- so that it can be fitted.

Note that the clamper lever 45 has a spring 47 engaged between its tip and the mounting member 43.
This spring 470 elastic force: J! , and is biased in a direction away from the turntable 34.

Further, on a shaft 44 supported by the clamper lever 45, a substantially concave drive lever 48 is rotatably supported at both ends thereof. That is, as shown in FIG. 9, this drive lever 48 has the second eccentric cam 30 at its base end.
An engaging portion 481 is formed that slides into contact with and selectively locks the first and second lock grooves 301 and 302 of the second eccentric cam 30. One end of a torsion spring 49 wound around the shaft 44 is engaged with the drive lever 48, and the other end of the 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, clan A configured as above? - Mechanism 1
The operation of No. 8 will be explained. That is, when the tray 20 is loaded in the direction of arrow B as described above, the movable rack 39 reaches the position shown in FIG. 10 from the position shown in FIG. 28 and rotates the lock gear 28 in the time direction 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 attached to the engaging portion 481 of the drive lever 48 that is locked in the first lock groove 301.
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 with the rotation of the second eccentric cam 30, and is rotated around the shaft 281. It is rotated counterclockwise in the figure. Here, as the drive lever 48 rotates, the crank lever 45 is rotated in the same direction, and the clamper portion 46 of the clamper lever 45 is moved to the fitting portion 341 of the turntable 34.
to fit. At this time, as described above, since the rotary plate 35 of the tray 20 is lowered while being rotated relative to the tray 2θ, the clamper portion 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, when the disk 33 is in the flange state as described above, when the disk fourting 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 clamp lever 45 perform an operation substantially opposite to the above-mentioned clamp operation, and are returned to their original positions. Omitted for convenience.

Here, FIG. 13 shows details of the 21-1 tooth portion 393 of the movable rack 39. 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 meshing 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. As shown, 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. Measures will be encouraged.

Further, by forming the notched tooth portion 398 on the 122nd tooth portion 393 of the movable rack 39, the transmission of the rotational force of the motor 21 is transmitted between the third reduction gear 25 and the fixed rack 38, as described above. This prevents an overload condition due to simultaneous meshing when shifting from the gear to the fifth reduction gear 27 and the first tooth portion 393 of the movable rack 39, thereby ensuring smooth 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 drives the movable rack 39 to operate the sunroofing member 28, moving the tray 20 to the disk drive position. It is designed to be locked. 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 2o 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.
By driving the switch clamp 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, promoting miniaturization, and the disk 33 can be easily attached to the turntable 34 in a predetermined state, thereby achieving reliable control. It is something.

Further, in the above-mentioned clamper mechanism 18, the Clasono 4 part 46 moves the disk 33 onto the rotary plate 3 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 in pressure contact with the turntable 34.

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

In the above-mentioned disk loading mechanism, all of its operations are performed by the third and fifth reduction gears 25.2 having different reduction ratios, to which the driving force from the same power source is transmitted in series.
7 was used to satisfy the requirements. Therefore, the configuration of the rotating drive system is simple and inexpensive, and the operations of each part 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 27 having different reduction ratios of the same drive system, respectively,
Moreover, these 25-3 and 5th reduction gears 25.21 and the first tooth portions 393 of the fixed rack 38 and the movable rack 39 are configured to mesh with each other at the same time so that transmission forces are transferred to each other. This allows the drive system to 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 disc is placed is arranged substantially in the loading direction at the disk device 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, its shape can be made small, and the size of the device can be promoted.

26- 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 section in its through hole 177. The body 50 is screwed onto the screw 5 with a predetermined angle to the loading direction. A substantially rectangular pickup guide through hole 501 is formed in the mounting body 50, and a pick guide fs2 is disposed in the through hole 501 via a pickup mount 52. By the way, since the rotary disk 35 (see FIG. 4) is rotated and lowered as described above when the disk loading is completed, 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, and for example, in the playback state, the disk 33 is moved along the through hole 50 by a pickup feeding mechanism, which will be described later. It is moved from the inner circumference toward the outer circumference at a predetermined speed.

Further, the turntable 34 is rotatably disposed in the mounting body 50 near one side of the through hole 5θ.

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 to the state shown in FIG.

Here, FIG. 14 shows a pick-up conveying bale structure for moving the big rack f32 in a predetermined direction. That is, the pickup mounting base 52 has a rack gear 53 (see FIG. 15) having elasticity formed at one end thereof, and a pair of guide support parts 521 and 522 that sandwich the rack gear 53. A support plate 520 having a protruding structure is attached. These guide support parts 521, 522
has guide holes 523 and 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
A drive gear 57 is meshed with the transmission gear 56 . The drive gear 52 is coaxially provided with a rotating shaft 581 of a pickup feed motor 58 installed on the lower surface of the mounting body 50, and is configured to transmit the rotational force of the motor 58 to the transmission gear 56. is being done.

On the other hand, at the other end of the pickup mounting base 52, a clamping part 59 is formed for clamping and guiding the vicinity of the peripheral edge 29 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 501.
It has the following.

That is, in order to move the picker f32 in the direction of arrow C in the pickup feed mechanism configured as described above, 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 rotates the transmission gear 56 clockwise in the drawing, and rotates the worm gear 55, which is coaxially provided via the transmission gear 56 and the guide rod 54, in the same direction.

At this time, this worm gear 55 is connected to the pickup mounting base 5.
By being in an elastic meshing relationship with the second rack gear 53, the pickup mounting base 52 is driven linearly in the direction of arrow C as the shell worm gear 55 rotates. Therefore, the pickup mounting base 52 is mounted on the guide support portions 521 and 522 and the clamping portion 59 through which the guide rod 54, which is the center of rotation of the human gear 55 and the transmission gear 560, is inserted.

32 in the direction of arrow C.

Also, the above Big Ala f,? 2 is moved in the direction indicated by the arrow, by reversing the motor 58, an operation substantially opposite to the movement in the direction indicated by the arrow described above is performed, and the explanation thereof will be given here. is omitted for convenience.

In this manner, in the pickup feeding mechanism described above, the rack gear 53 corresponding to the movement position of the big gear f32 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 accuracy.

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 bi and qua f32. At this time, the pickup 32 detects the intensity and temporal length 1 of the light, outputs an electrical signal corresponding to the intensity, and outputs an electrical signal that is recorded on the disk 33 and a digitally encoded signal is extracted therefrom. Then, the big aperture f32 is moved from the inner periphery to the outer periphery of the disc 33 by the big aperture and f feeding mechanism, and reproduction of the disc 33 is completed. Here, when the rope ``ing key 13 is operated again, the ice loading mechanism is reversed as described above, and the tray 20 is moved to the position shown in FIGS. 4 and 3, and then to the disk device position shown in FIG. 2. This is where the disk 33 is attached and detached.

Next, one embodiment of the present invention will be described in detail with reference to the drawings. FIG. 16 shows the main parts of the optical disc record reproducing apparatus according to the invention, which improves the controllability of the loading drive section of the basic optical disc record reproducing apparatus described above. However, the first
In FIG. 6, the same parts as those of the optical disk record reproducing apparatus of the basic example are given the same reference numerals, and the explanation thereof will be omitted.

In other words, 26A in the figure is a fourth reduction gear rotationally driven by the third reduction gear 25 which drives the fixed rack 38 of the tray 20. The fourth reduction gear 26A has a larger diameter gear 26B than the third reduction gear 2.
5, and its small diameter gear 26C is meshed with a fifth reduction gear 27 that drives the movable rack 39.

Therefore, FIGS. 17 and 18 (a) and (b) respectively show details of the fourth reduction gear 26A,
26D is a rotating shaft installed in the guide portion 1-72 of the mounting structure 17. This rotating shaft 26D has the above-mentioned large diameter teeth:
IIL26B is rotatably supported, and this large diameter gear 2
A pair of substantially arc-shaped through holes 26E and 26F are formed in the end surface of 6B in the circumferential direction, respectively.

Further, the small diameter gear 26C is rotatably supported above the large diameter gear 26B on the rotating shaft 26f), and the small diameter gear 26C has protrusions zeG, z for position regulation.
6H is formed 34- corresponding to the through holes 26B and 26F of the large diameter gear 26f3. The small diameter gear 26C has a protrusion 2
6G and 26H are the through holes 26E of the large diameter gear 26B.
, 26F', and is provided so as to be in phase with the large-diameter gear 26B with a spring member 26I interposed therebetween.

That is, the fourth gear 26 configured as described above. The fixed rack 38 is moved by the third reduction gear 25 in the direction of arrow B.
When the movable rack 39 is driven in the direction, the teeth 393 of the movable rack 39 are not meshed with the fifth reduction gear 22.
Since the small diameter gear 26C is in a no-load state, the large diameter and small diameter gears 26B and 26C are rotationally driven as one unit. Then, when the fixed rack 38 is further driven in the direction of the arrow B, the third reduction gear 25 is separated from the tip thereof, and at this time, the fifth reduction gear 25 is detached from the tip thereof.
When the reduction gear 27 meshes with the teeth 393 of the movable rack 39, a slight simultaneous gear tooth condition occurs. In this case, the load force due to the simultaneous meshing is absorbed by the fourth reduction gear 26A. For example, the fourth reduction gear 26A resists the spring force of the spring member 26I, Among the gears 26'f3 and 26C, the smaller diameter gear 26C is rotated by the load force.

In the gear transmission mechanism configured as described above, the third reduction gear 25 drives the fixed rack 38.
The large diameter and small diameter gears 26B and 26C of the M4 reduction gear 26A, which is interposed between the M4 reduction gear 26A and the fifth reduction gear 27 that drives the movable rack 39, are constructed separately with the spring member 26 interposed therebetween. Therefore, the fourth reduction gear 26A transfers the load force caused by the simultaneous meshing of the third and fifth reduction gears 25 and 22 to its larger and smaller diameter gears 26B and 26.
This is absorbed by the spring member 26 interposed between C and can reliably prevent gear locking due to simultaneous meshing.

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

〔Effect of the invention〕

As described above, it is an object of the present invention 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. I can do it.

[Brief explanation of drawings]

FIG. 1 is an external perspective view showing an optical disc record playback device as a basic example of the present invention, FIG. 2 is a perspective view showing the disc loading mechanism section and 5"4 playback mechanism section of FIG. 3 and 4 are respectively perspective views showing the operating state of FIG. 2, FIG. 5 is an I11 perspective view showing a part of FIG. 2, and FIGS. 6, 7, and 8 are respectively A perspective view showing some details of Figures 2, 3 and 4, Figure 9
10 and 11 are perspective views showing other details of FIGS. 2, 3, and 4, respectively, and FIG. 12(a)
, 弽) are respectively plan views showing the operation of the cranno 4 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 crank no. 15(a) and 15(b) are plan views and cross-sectional views showing some details of FIG. 14, and FIG. 16 is an optical system according to an embodiment of the present invention. FIG. 17 is an exploded perspective view of the reduction gear shown in FIG. 16, and FIGS. 18(a) and 18(b) are cross sections showing details of the reduction gear shown in FIG. 16. It is a diagram. 1 No... Cabinet, 12... Loading mechanism section, 13... Loading key, 14... Power key, 15... Display section, 16... Operation section, 17... Mounting structure, 18... 2 pump mechanism, 19... Disk playback mechanism section, 20... Tray, 2... 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, -3
&- 176...Rotating shaft, 177...Through hole, 32...Pickup, 33-...Disc, 34...Turntable, 35...Turning plate, 36.37... Guide member, 38... fixed rack, 39... movable rack, 40
... Drive member, 41... Protrusion, 42... Switch, 43... Mounting member, 44... Shaft, 45... Clamper lever, 46... Clamper! ,461...
Brim part, 47...Spring, 48...lIt movement v
Bar, 49... Torsion spring, 50... Mounting body, 51... Screw, 52... Pick up mounting base, 53... Rack gear, 54... Guide rod, 55...
- Worm gear, 56... Transmission gear, 57... Drive gear, 58... Motor, 59... Pincer part, 60...
・Spring, 26A...Fourth reduction gear, 26B・
... Large diameter gear, 26C... Small diameter gear, 26D...
・Rotating axis 1. ? 6E126F...Through hole, 26G, 26
H: protrusion, 26I: spring member. Applicant's agent Patent attorney Takehiko Suzue 39- Figure 10

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 optical disc in a horizontal position for playback with respect to a turntable, the loading mechanism a first rack member that drives the
a second rack member that drives the crank mechanism and is slidably supported with respect to the first rack member; and a driving force selectively applied to the first and second rack members. The first and second transmission gear systems are configured to mesh with each other at the time of switching, and the first and second gears are meshed with both the first and second transmission systems. a third transmission gear system consisting of a third transmission gear system, and a first transmission gear system of the third transmission gear system
and a second gear are provided to be rotatable independently of each other, and are configured to prevent the first and second transmission gear systems from locking.