JPS59135668A - Optical disk record reproducing device - Google Patents

Abstract

PURPOSE:To attain the titled device capable of sure driving with a simple constitution by providing a rack gear having elasticity along a driving shaft to the side to be supported of a pickup to mesh a worm gear in elastic contact. CONSTITUTION:A notched part 397 for preventing locking due to meshing is formed to the 1st tooth section 393 in the vicinity of the base of teeth from the base to a prescribed position. Then, the tooth part 393 is formed by the notched tooth part 398 for preventing locking due to meshing, having the tooth tip of e.g., two teeth from the base notched in sharp angle as shown by a slant line. Further, when a reducer gear 27 is meshed with the notch tooth part 398 of the tooth part 393 of a moving rack 39 by utilizing the elasticity of the notch part 397, a reducer gear 25 is detached from the tip of the fixed rack 38 almost at the same time. Thus, the locking state caused by simultaneous meshing of the reducer gears 25, 27 is prevented for the tooth part 393 by means of the elasticity of the notch part 397 and overload to a motor 21 is prevented, allowing to save electric power.

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 method using PCM (pulse code modulation) technology has appeared and is becoming popular in order to achieve as high fidelity as possible. In other words, this is called digital audio, and the principle is that the audio characteristics are independent of the characteristics of the recording medium and are much superior to the conventional analog system. 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 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 methods. be done.

For example, in an optical disc record playback device that uses the CD (Conno 4 CD) method among optical playback methods, bits (irregularities and convexities with different reflectances) corresponding to digitized (PCM) data are placed on a transparent resin disk. ) with a diameter of 12 ern and a thickness of 1.
A two-tone optical disc is driven at a variable rotational speed of approximately 200 to 500 rpm using a CLV (constant linear velocity) method. In this case, the disc has a track pitch of 1.
Considering that it is 6 μm and records a huge amount of information that can be played in stereo for about an hour on one side, it is easy to see that it requires various advanced functions and performance. .

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. 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 allows easy attachment and detachment of the optical disc, and has not yet achieved high precision with the simplest possible configuration.

In this case, it is not enough to simply load the disc horizontally, but there are various aspects of the optical disc record playback device as a whole in relation to the disc playback mechanism including the big drive mechanism, disk drive mechanism, etc. It must be able to respond to requests.

[Purpose of the invention]

This invention has been made in view of the above points, and an object of the present invention is to provide an improved optical disc record playback device that can reliably drive a disc playback mechanism with the simplest possible configuration. There is.

[Summary of the invention]

That is, the optical disc record reproducing apparatus according to the present invention is equipped with a big-aggregation transport mechanism that allows a reproducing pickup to be freely transported in the radial direction of the optical disc, and the pickup transport mechanism has one end of the pickup. It is constructed in the same direction as the transfer direction, and is supported by a drive shaft with a worm gear fitted in the middle,
An optical disc characterized in that an elastic spiral gear is provided along the drive shaft on the supported portion side of the pickup, and the worm gear is elastically engaged with the rack gear. Record playback device ((Aro.

[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. And this cabinet.

On the front panel of the drive 11, a DAD (hereinafter referred to as disk) loading mechanism 12 moves an arrow (
4) It is installed in a so-called horizontal loading type that can be freely moved in and out in the (B) direction, and the disc is placed horizontally on the tray section and then loaded horizontally into the drive position for playback. will be described later.

Note that 14 in FIG. 1 is a power key that is operated prior to operating the loading key 13. Hereinafter, a display section 15 is disposed on the upper right side of the loading mechanism section 12; At the bottom of the screen, there is a gray key (PLAY) for play operation, and a stop key (5TOP).
, Next key (NEXT), 7 First 7 Oward key (F, F) for 7 first backward operation
, Pack word key (BWD) for pack word operation
), pause key (PAUSE), repeat key (
An operating section 16 having REPEAT ) and is arranged parallel to the loading key 13 .

FIGS. 2, 3 and 4 respectively show the loading mechanism section 12 in its respective states before, during and after disk loading 6. As shown in FIG. First, the second
In the figure, reference numeral 17 denotes a mounting structure that extends over the main chassis, which has an approximately inverted concave shape, to which the loading mechanism section 12, Crano 4-mechanism 18, disk playback mechanism section 19, etc. are attached. A generally rectangular tray main body 20 for mounting is disposed so as to be movable in the direction of arrow (6), ω. That is, as shown in FIG. 5, this mounting structure 17 is provided with a pair of collars 171 and 171 for installing the cabinet 11 (see FIG. Guide part 1 with a substantially concave shape at the tip
72 is formed.

The guide portion 172 is provided with a pair of guide rollers 113 and 114 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, a second gear, and a second gear. 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.

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. A second eccentric cam 3o for driving the clamper is coaxially provided. Furthermore, the mounting part 1
75 is provided with a rotation shaft 176 substantially parallel to the rotation shaft 28, and the lock member 31 is supported on the rotation 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 proximal end of the opening member 31 and the mounting portion 175, so that the opening member 31 is biased counterclockwise in the figure. There is.

On the other hand, the second eccentric cam 30 is connected to the first eccentric cam 2.
9, and first and second locking grooves 30 for the clamper lock are provided at the lowest and highest eccentric positions.
1, 302 are formed.

Here, the mounting structure 17 has a through hole 177 formed approximately in the center of its upper surface. A pickup (transmission system) including a turntable 34 having a fitting part 34 inserted into the through hole 177 of the pick ring f32 and the optical disk 33 (shown by the dotted chain line in FIG. 2). ) The disk playback mechanism section 19, which will be described later and which integrates a drive mechanism and a disk drive mechanism, moves in the loading direction (arrow (4)
, CB) direction) and is arranged as a unit on a mounting body 50 that becomes a sub-chassis.

Further, the mounting structure 17 has the mounting portion 1 on the upper surface thereof.
A pair of support stands 1'18 and 118 for supporting the clamper lever are erected at both ends corresponding to the lever 75.

Here, a loading mechanism configured to be attached to the attachment structure 9-17 configured as described above will be explained. That is, as shown in FIG. 2 again, the tray main body 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. This tray body 20
A through hole 201 corresponding to the disk 33 is formed approximately in the center thereof, and a plurality of guide grooves 202 are formed at predetermined intervals on the inner peripheral wall of the through hole 201 (for convenience of illustration, only one place in FIG. 4 is formed). (only one of which is shown in the figure) is formed to be inclined downward.

A rotating tray 35 on which the disk 33 is placed is installed in the through hole 201. rotating tray 35 with
A plurality of protrusions 351 (for convenience of illustration, only one location is shown in FIG. 4) corresponding to the plurality of guide grooves 202 of the through hole 201 are formed at predetermined intervals on the peripheral edge of the tray. The plurality of protrusions 351 are guided by the plurality of guide grooves 202 with respect to the main body 20, and are freely rotatable clockwise and counterclockwise in the figure, and are also vertically movable.

The rotary tray 35 also has laser irradiation holes 35 located in the loading direction (i.e., arrows (4) and (B) directions) before and during the loading of the disc 10.
2 are formed from the center toward the outer circumference. The through holes 352 of the rotary tray 35 are inserted into the plurality of protrusions 351 after the disc is loaded, as shown in FIG.
is guided by the plurality of guide grooves 202, 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 are as follows. This will be described later.

Here, the tray main body 20 and the rotary tray 35 each have a pair of recesses 203 that serve as guide portions for attaching and detaching the disk.
, 204 and 353, 354 are formed at positions that coincide with each other (at least in the extended state of the tray body 20) as shown in FIGS. 2 and 3 before and during disk loading, respectively. Of these, the recesses 353 and 354 of the rotating tray 35 are formed as shown in FIG. As shown, the recess 35 of the tray main body 20
3 and 354, respectively.

Further, the tray main body 2o has guide members 3 at both ends thereof.
6.37 are formed extending from one end thereof, corresponding to the guide portions 172 of the mounting structure 17, respectively. These guide members 36 and 37 each have a guide groove portion 3.
61 (for convenience of illustration, the guide member 37 is not shown) are formed corresponding to the guide rollers 173 and 174 of the guide portion 172 of the mounting structure 17.

For this reason, the tray main body 2o has its guide member 36.3.
Each of the guide groove portions 361 of 7 is connected to the guide portion 1 of the mounting structure 17.
It is engaged and guided by rollers 173 and 174 of 72 and is movable in the directions of arrows (A) and (B).

Here, the tray body 20 has a fixed rack 38 for loading drive and a movable rack 3 on the lower surface of one side end thereof.
9 are arranged in a stacked state as shown in FIG. That is, the fixed rack 38 is attached to the tray main body 2.
It is formed on the lower surface of the mounting structure 17 to correspond to the third reduction gear 25 of the mounting structure 17, and guide pins 381 and 382 are protruded from the upper surface at a predetermined interval.

On the other hand, guide holes 391 and 392 are formed in the movable groove 39 disposed on the upper surface of the fixed rack 38,
Guide pins 381 and 382 of the fixed rack 38 are inserted into the guide holes 391 and 392, respectively.

The movable rack 39 has a first tooth portion 393, which will be described in detail later, at its distal end corresponding to the fifth reduction gear 27 of the mounting structure 17, and a second tooth portion 393 at its base end. A toothed portion 394 is formed corresponding to the lock gear 28. Further, the movable rack 39 has a movable portion 395 formed at its distal end to protrude inwardly, and a bin 396 is formed at the distal end of the movable portion 395. One end of a driving member 40 is rotatably supported by this bin 396, and the other end of this driving member 46 is rotatably supported by a bin 355 protruding from the rotating tray 35. be done.

Also, as shown in FIG. 2 again, the tray main body 20 has four locking protrusions formed at its base end, and this protrusion 41 has a locking protrusion 41 for locking the locking member 31 of the mounting structure 17. A lock bin 411 is formed corresponding to the groove 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 disc loading shown in Figure 2, if the disc 33 is not loaded, the loading key 13. (See FIG. 1), the motor 21 is driven and the gear 22 is rotated counterclockwise in the figure. This rotational force is transmitted through the gear 22 to the first, second,
The signal is transmitted to the third, fourth, and fifth reduction gears 23 to 22. 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 body 20 is moved furthest in the direction of arrow (B) as shown in FIG. migrated and its movement is stopped. Here, this third
The reduction gears 14-25 are removed from the tip of the fixed rack 38, and at this time, the fifth reduction gear 27, which is further decelerated and driven in the same direction, engages the first tooth portion 393 of the movable rack 39. The second tooth portion 3 of this movable rack 39 is engaged with the base end.
The lock gear 28 is meshed with the lock gear 94. 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 the arrow (in the middle), so that the driving member 40 is moved toward the bin 35 of the rotary tray 35.
Press 5. Therefore, the plurality of protrusions 35 of the rotary tray 35 are connected to the plurality of guide grooves of the tray main body 20.
02 and is lowered while rotating counterclockwise in the figure.

Here, the rotating tray 35 has a through hole 3 for laser irradiation.
Reference numeral 52 corresponds to the feeding direction of the pickup 32 (that is, the arrow (C) and (D) directions), 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. 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 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. 11, the locking groove 311 of the locking member 31 locks the locking pin 41 of the locking protrusion 41 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 28 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. Therefore, the disc loading mechanism section 12 moves the tray main body 20 in the direction of the arrow (A) by performing an operation substantially opposite to that when mounting the disc 33 on the turntable 34, thereby loading the disc as shown in FIG. It is meant to reach the location.

Here, the clamper mechanism 18 that presses and supports the disc 33 against the turntable 34 in a state in which disc loading has been completed as described above will be described. That is, as shown in FIG. 2 again, the mounting structure 17
A mounting member 43 is supported in a connected manner on the support stands 1'18 and 17B. And this mounting member 43
A shaft 44 is supported substantially parallel to the mounting member 43 at the lower surface thereof, and the shaft 44 has a clamp/4'
- The intermediate portion of the lever 45 is rotatably supported. This clamper lever 45 has an extending portion 451 formed at its base end, and the extending portion 45 is inserted into a recess 179 for position regulation formed in the mounting portion 175 of the mounting structure 17. 17-ru. Further, at the tip of the clamper lever 45, a part 46 of the clamper lever 4, which is formed of a magnetic material and has a cylindrical shape with a bottom, is supported with an appropriate amount of play, facing the turntable 34.

This clan i+ part 46 has the above-mentioned disk 33 at its tip.
A flange portion 461 is formed to lock the vicinity of the hole, and the disc 33 is fitted into the fitting portion 341 of the turntable 34 by its magnetic force.

The clamper lever 45 has a spring 47 engaged between its tip and the mounting member 43.
The elastic force of the spring 470 urges it 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 sliding 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. For this reason, the above-mentioned [dynamic lever 4 B,! : The clamper lever 45 and the clamper lever 45 are adapted to be rotated together in conjunction with each other.

Here, the crank/mother mechanism 18 configured as described above is used.
The operation will be explained. That is, when the tray main body 2o is loaded in the direction of the arrow (middle) as described above,
The movable rack 39 reaches the position shown in FIG. 10 from the position shown in FIG.
8 and rotates the lock gear 28 counterclockwise in the figure. Therefore, the second eccentric cam 3°, which is provided coaxially with the lock gear 28, is driven to rotate in the same direction. At this time, the second eccentric cam 30 is attached to the engaging portion 4 of the drive lever 48 that is locked in the first lock groove 301.
81 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 30 rotates, and the drive lever 48 rotates around the shaft 281. It is rotated counterclockwise in the figure. Here, the drive lever 5-4g rotates the clamper lever 45 in the same direction as the drive lever 5-4g rotates.
Connect the crank i4 part 45 to the fitting part 3 of the turntable 34.
41. At this time, as described above, since the rotating tray 35 of the tray body 20 is lowered while being rotated relative to the tray body 20, the clamper portion 46 presses the disk 33 against the turntable 34 by its magnetic force. At this point, the loading of the disc 33 onto the turntable 34 is completed.

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

FIG. 13 shows details of the first tooth portion 393 of the movable rack 39. That is, the first tooth portion 393
A notch 397 for preventing meshing and locking is formed near the root of the tooth from the base end to a predetermined position. 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 of the movable rack 39 by utilizing the elasticity of the notch portion 397, the movable rack 39 is 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 21-' prevents the locked state caused by the simultaneous meshing of the third and fifth reduction gears 25 and 27 due to the elasticity of its notch portion 397, and also prevents the locking condition caused by the simultaneous meshing of the third and fifth reduction gears 25 and 27. This prevents overloading and promotes power saving measures.

Further, the first tooth portion 393 of the movable rack 39 is
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 overload conditions due to simultaneous engagement when shifting to 393, resulting in smoother operation and promoting power saving measures.

Next, the disk playback mechanism section 19 that plays back the disk 33 will be explained. As shown in FIGS. Mounting body 5o which becomes the sub-chassis of
is screwed in with a screw 51 via a damper at a predetermined angle with respect to the loading direction.

22- A substantially rectangular pickup guiding through hole 501 is formed in this mounting body 50, and the pickup 32 is disposed in the through hole 50 via a pickup mounting base 52. . Here, the pickup 32 is mounted on the rotating disc 35 (see FIG. 4) with the disc loading completed.
is rotated and lowered as described above, the arrows (C), (
D) It is arranged so that it can move freely in the direction. During the movement process, the pickup 32 irradiates the disk 33 with a laser beam and receives its reflected light.
The disk 33 is linearly moved at a predetermined speed from the inner circumference toward the outer circumference along the disk 33 .

Further, the turntable 34 constituting a disk drive mechanism 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 a turntable driving motor shaft (not shown) via a bearing 340, and is controlled by the motor in conjunction with the operation of the operating section 16 (see FIG. 1). It is designed to be rotationally driven in the state of.

Here, FIG. 14 shows a big-edge: 7" (feed) drive mechanism that moves the big-edge 7° 32 in a predetermined direction. That is, the pickup mounting base 52 has an elastic member at one end. A rack gear 5 comprising
3 (see FIG. 15), and a pair of guide support parts 521 and 522 are formed to sandwich this rack gear 53.
A support plate 520 made of resin and provided with a protrusion is attached. Guide holes 523 and 524 facing each other are formed in the guide support parts 521 and 522 substantially in the center thereof, and a guide rod 54 serving as a guide shaft and a drive shaft is inserted into the guide holes 523 and 524. 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, after the guide rod 54 has both ends passed through the guide holes 523 and 524, the guide rod 54 is inserted into the mounting body 5, respectively.
It is rotatably supported by bearing parts 512 and 51:j formed at 0. One end of the guide rod 54 passes through one of the bearings 512 and 513, and is further provided with a transmission gear 56 coaxially, and a drive gear 57 is meshed with the transmission gear 56. Ru. This drive gear 5
Reference numeral 7 is provided coaxially 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. .

On the other hand, at the other end of the pickup mounting base 52, a clamping portion 59 is formed which clamps and guides the vicinity of the periphery of the through hole 501 of the mounting body 50 as a rail. sandwiching part 5 with
9 has a guide row 2591 at its upper end corresponding to the upper surface of the peripheral edge of the through hole 501, and a guide protrusion 592 at its lower end corresponding to the lower surface of the peripheral edge of the through hole 501. It is.

In other words, in order to move the pickup 32 in the direction of arrow (c) in the pickup (feed) drive mechanism configured as described above, for example, the motor 58 is driven counterclockwise in the figure and the drive gear 52 is moved in the same direction. drive in the direction of rotation. 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, by making the worm gear 55 elastically mesh with the rack gear 53 of the pickup mount 52, the pickup mount 52 is linearly driven in the direction of arrow (C) as the gear 55 rotates. be done. For this reason, the pickup mounting base 52 is guided by the guide supports 521 and 522 and the sandwiching part 59 through which the guide rod 54, which is the center of rotation of the gear 55 and the transmission gear 56, is inserted. It will be moved to

26- Furthermore, when the pickup 32 is moved in the direction of the arrow (B), the motor 58 is reversed to perform an operation substantially opposite to the movement in the direction of the arrow (D) described above, and the pickup 32 is moved in the direction of the arrow. Therefore, its explanation will be omitted here for convenience.

Now, with the disk loading completed as described above, the play key (see FIG. 1) of the operating section 16 of the cabinet 11 is operated to play the disk 33.

Then, the turntable drive motor (not shown) is driven and the disc 3 mounted on the turntable 34 is driven.
3 is rotated to a predetermined state, and a laser beam is irradiated from the pickup 32 onto the signal recording surface of the disk 33 through a through hole 352 formed in the rotating tray 35 of the tray body 20. This radar beam hits the signal recording surface of the disk 33 and is reflected, and the reflected beam is received by the pick array f32.

At this time, the pickup 32 detects the intensity and temporal length of the light, outputs an electrical signal corresponding to the intensity, and outputs an electrical signal from which the digitally encoded signal is recorded on the disk 33 and extracted. Then, the pickup 32 is moved from the inner circumference to the outer circumference of the disk 33 by the pickup feeding mechanism, and reproduction of the disk 33 is completed.

Now, when the loading key 13 is operated again, the disc loading mechanism is reversed as described above, and the tray body 20 is moved to the position shown in FIGS. 4 and 3, and then to the disc mounting position shown in FIG. 2. This is where the disk 33 is attached and detached.

According to the optical disk record reproducing apparatus as described above, one end of the pickup 32 is connected to the pickup 3.
2, that is, in the same direction as the radial direction of the disk 33, is supported by a guide rod 54 serving as a drive shaft, and is elastically attached to the side of the supported portion of the pickup 32 along the guide rod 54 serving as a drive shaft. A rack gear 53 having
By elastically meshing the rack gear 53 with a worm gear 55 fitted in the middle of a guide rod 54 serving as a drive shaft, the pickup 33 is configured to be transportable with a vibration absorbing effect. , pickup (transfer)
This has the advantage that the drive mechanism, and by extension the disc playback mechanism section 19, can be reliably driven with the simplest possible configuration.

This type of pickup (transmission,! l)) drive mechanism is required to be equipped with a vibration absorption mechanism because it is required to prevent undesired vibrations, shocks, etc. from affecting the pickup and the pickup (!l). However, in this invention, a worm gear 55 fitted on a guide rod 54 is used as a drive shaft for an elastic rack gear 53 without using a special vibration absorption mechanism such as a normally used oil damper. This is because a vibration absorbing effect can be provided simply by elastically meshing them.

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

29- [Effects of the Invention] Therefore, as described in detail above, the present invention provides an optical disc record playback device that is improved so that the disc playback mechanism can be reliably driven with the simplest possible configuration. It becomes possible to do so.

[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. 4 are perspective views showing the operating state of FIG. 2, FIG. 5 is a perspective view showing a part of FIG. 2, and FIGS. 6, 7, and 8 are perspective views of FIG. 2. ,
Figures 3 and 4 are perspective views showing some details, Figures 9, 10, and 11 are Figures 2, 3, and 4, respectively.
A perspective view showing some other details of the figure, Fig. 12 (-), (b
) is a plan view 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 with the pickup mechanism shown in Fig. The perspective views shown in Figures 15(,) and (b) are respectively the first
FIG. 4 is a plan view and a sectional view showing some details of FIG. 4; 1...Cabinet, G, 12...Loading machine m
s, J s...Loading key, 14...Power key, 15...Display section, 16...Operation section, 17...
Mounting structure, 18... Clamper mechanism, 19... Disc playback mechanism section, 20... Tray body, 171...
Flange part, 172... Guide part, 173.174... Roller, 21... Motor, 211... Rotating shaft, 22...
... Drive gear, 23... First reduction gear, 24...
Second reduction gear, 25...Third reduction gear, 26...
・Fourth reduction gear, 27...Fifth reduction gear, 28・
... Lock gear, 281 ... Rotating shaft, 175 ... Mounting part, 29 ... First eccentric cam, 30 ... Second eccentric cam, 31 ... Lock member, 31 ...・Lock groove, 312...Sliding contact part, 301...First locking groove, 3
02... Second locking groove, 176... Rotation shaft, 177
...Through hole, 32...Pickup, 33...Optical disc, 34...Mating part, 34...Turntable, 178...Support stand, 201...Through hole, 20
2... Guide groove, 35... Rotating tray, 351...
Projection, 352... Through hole, 203, 204... Recess, 353, 354... Recess, 36.37... Guide member, 371... Guide groove, 38... Fixed rack,
39...Movable rack, 381. 382... Guide bottle, 391, 392... Guide hole, 393... First tooth part, 394... Second tooth part,
395...Movable part, 396...Bin, 40...Driving member, 355...Bin, 41...Protrusion part, 41...Lock bin, 282...Protrusion part, 42...・Switch, 43...Mounting member, 44...Shaft, 45...
Crane i9-lever, 45mm... extended ifl, 1'19
...Concave part, 46...Cran/4' part, 46...
・Brim part, 47... Spring, 48... Drive lever, 481... Engagement part, 49... Torsion spring, 50... Mounting body, 51... Screw, 52...
Pickup mounting base, 501... Through hole, 53... Rack gear, 521, 522... Guide support part, 54...
... Guide rod, 55 ... Worm gear, 512, 51
3... Bearing portion, 56... Transmission gear, 57... Drive gear, 58... Motor, 581... Rotating shaft, 59...
... Sandwiching part, 591 ... Guide roller, 592 ... Guide protrusion, 397 ... Notch part, 398 ... Notch tooth part,
6o... Spring, 520... Support plate. Applicant's agent Patent attorney Takehiko Suzue 33- Figure 7 Figure 8 Figure 10 Figure 11 J So 4

Claims (1)

[Claims] In an optical disc record playback device comprising a pickup transport mechanism that can freely transport a reproducing pickup in the radial direction of the optical disc, the pickup transport mechanism moves one end of the pickup in the same direction as the transport direction. It is supported by a drive shaft with a worm gear fitted in the middle, and an elastic rack gear is provided along the drive shaft on the side of the supported part of the pickup, and the rack gear is An optical disk record reproducing device characterized in that the worm gears are elastically engaged with each other.