JPH02103769A - Recording disk reproducing device - Google Patents

Abstract

PURPOSE:To perform the stable recording and reproducing against vibration by holding a subchassis being placed with a turntable in its position by a holding means during the recording and reproducing. CONSTITUTION:Positioning guides 115a and 115b are provided as the holding means in the opposite part to a recording and reproducing position of roller 33 and 34 at the tips of brackets 21 and 22 of a roller bearing 35. As to these positioning guides 115a and 115b, when the brackets 21 and 22 as the subchassis is turned until its recording and reproducing position, the rollers 33 and 34 are held between the positioning guides 115a and 115b, so that the vibration can be prevented even when the vibration is likely generated due to unbalance of a recoding disk during the recording and reproducing time. By this method, the recording and reproducing can stably performed against the vibration.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an audio or video information recording/reproducing device using laser light, and particularly to an optical recording disk reproducing device.

(Prior art) For several years now, in the audio and video fields, information has been stored by irradiating a recording disk (hereinafter referred to as a disk) with laser light.
Optical video discs have been introduced that reproduce signals as changes in the amount of returned light due to pit diffraction. Regarding the playback device, in order to improve operability and use space efficiently, discs can be loaded from the front of the playback device.
The front loading method that performs unloading is the mainstream. Hereinafter, a loading mechanism of a conventional optical disc front-loading type reproducing apparatus will be described with reference to the accompanying drawings FIGS. 20 to 25.

FIG. 21 shows a state in which the slide table 202 for loading and unloading discs is pulled out from the front of the recycling bag fif 200, and FIG. 20 shows a state in which it is closed.

In FIG. 22, a slide table 202 has a disk 201 placed on it and an elevating plate 203 that is movable up and down. The motor 204 rotates as the motor 204 rotates, and holds the disc 201 at high speed during playback operation.
A turntable 205 is attached that rotates the E and the turntable together.

Furthermore, a center spindle 206 for positioning the center of the disk 201 is also attached to rotate together with the turntable 205. disc clamper 20
7 is a support arm 208 rotatably attached to a center stay 210 fixed to an arm 208 so as to cross both sides of the playback device, and rotating around a fulcrum 209;
It performs a downward movement and serves to press the disc 201 onto the turntable 205.

In the above configuration, in order to load a disc, first, as shown in FIG.
Place the disks from disk 201' to disk 201 (A).

Next, as shown in FIG. 23, slide table 202 is pushed in and closed. In this state, the disk 201 is still placed on the elevating plate 203.

Then, as shown in FIG. 24, the elevating plate 203 is lowered to a position lower than the turntable 205. This places the disc 201 on the turntable 205.

Thereafter, the arm 208 rotates downward using the pin 209 as a fulcrum, and the disc clamper 207 presses down the disc 201, which is placed on the turntable 205. It is clamped and loading is completed.

When unloading, the operation is the opposite of the above, i.e.
The arm 208 rotates upward about the pin 209,
Disc clamper 207 rises.

Next, the elevating plate 203 rises and lifts up the disc 201 placed on the second side of the turntable 205.
Place it on top of 3. The elevating plate 203 is the slide table 20
After rising to the predetermined position of 2, the slide table 20
2 and take out the disc 201. In addition, the second
2 to 24, mechanisms for raising and lowering the elevating plate 203 and the disk clamper 207 are not shown.

In the conventional structure described above, since the disk clamper 207 must be lowered to clamp the disk 201, a mechanism for moving the disk clamper 207 up and down is required. Furthermore, it is necessary to incorporate a mechanism for moving the elevating plate 203 up and down, which requires a large number of parts and hinders miniaturization of the device.

Furthermore, the slide table 202 and the lift plate 203 are constructed as separate pieces, and in order for the lift plate 203 to move up and down with respect to the slide table 202, the slide table 202 has a hole through which the lift plate 203 passes. It is provided. However, since the slide table 202 is frequently put in and taken out, it must not be easily damaged in case a force is accidentally applied in the vertical direction. Therefore, the elevating plate 203 has a separate piece structure, and has the disadvantage that it has to have a thick structure in order to prevent the above-mentioned large hole from breaking.

Therefore, the inventor first developed a system for the part 11'4 of the conventional playback device.
We have proposed a new recording disk loading mechanism that has fewer points, has a simpler loading mechanism, and aims to reduce the size of the device, improve productivity, and improve reliability (Japanese Patent Application No. 59-266331). reference).

As shown in FIG. 26, a sub-chassis 301 is supported on a main chassis 300 so as to be able to move up and down (rotate).
A motor 302 and a turntable 303 are mounted on a subchassis 301.

During recording and reproduction, a disk clamper 304 for clamping the recording disk with a turntable 303 is connected to a centasty 304 fixed to a main chassis 300, which is a stationary part.
5 is rotatably attached.

In this way, the disc clamper 304 does not move up or down,
Furthermore, since there is no lifting plate that moves up and down, the loading mechanism can be greatly simplified.

By the way, the present inventor conducted various tests on the device proposed earlier, and found that when the recording disk is rotated at high speed, the recording disk sometimes vibrates.

After various studies on the reason for this, we found that the thickness of the recording disk is not uniform over the entire surface, and due to this non-uniformity, the center of gravity of the recording disk shifts from its original center of rotation, resulting in imbalance when rotated at high speed. It is believed that there is.

This vibration not only increases the servo load on the optical head device, but also may impede recording and reproduction if the vibration is large.

(Problems to be Solved by the Invention) As described above, even in the useful recording disk reproducing apparatus proposed earlier by the present invention, as a result of study, it is considered that vibration countermeasures are necessary.

The present invention has been made in consideration of the following two circumstances.The purpose of the present invention is to reduce the number of parts, simplify the loading mechanism/QX, and enable stable recording and playback even against vibrations. The goal is to provide equipment.

[Structure of the Invention] (Means for Solving the Problems) A recording disk reproducing device of the present invention includes a main chassis, a sub-chassis supported to be movable up and down with respect to the main chassis, and a sub-chassis placed on the sub-chassis. a turntable rotatably driven by a motor; a disk clamper rotatably attached to a stationary part; and an elevating device that moves the subchassis up and down in order to clamp or release a recording disk between the disk clamper and the turntable. a moving means; and a moving means provided in the stationary part for maintaining the position of the sub-chassis in a direction substantially parallel to the plane of the recording disk when the sub-chassis is moved to a recording/reproducing position of the recording disk by the elevating and lowering movement means. and an optical head device for reproducing information or recording information from the recording disk.

(Function) In the device configured in this way, the sub-chassis on which the tongue table is placed is held in its position by the holding means provided on the stationary part during recording and playback, so that the recording disc is Even if the motor rotates at high speed and vibrations occur due to unbalance, in reality, vibrations rarely occur.

(Embodiment) A recording disk reproducing apparatus of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 are exploded perspective views of the recording disk reproducing apparatus of the present invention. 10 in FIG. 2 is a disk tray. The disk tray 10 is provided with steps 11.degree. 12.13 for guiding the outer shape of the disks so that disks of various sizes can be placed with their centers approximately at predetermined positions. Figure 27 (a), (b), and (c) show various disc shapes. For example, (a) and (b) are video discs, and (e) is a compact disc, and these discs have a disc tray. Positioning is performed at 10 steps 11, 12, and 13.

Grooves 14, 15 are provided on both sides of the disc tray 10 so that the disc tray 10 can slide horizontally without being supported when entering and exiting the player body.

FIG. 1 is an exploded perspective view showing an outline of the structure of a mechanism of a recording disk reproducing apparatus according to the present invention. Figure 1 shows the disk tray 1 in Figure 2 to make it easier to understand the component parts.
0 is omitted.

In FIG. 1, spindle motors 23 and 24 for video discs and compact discs are attached to the main chassis 20 by brackets 21 and 22, which are sub-chassis. 25°26 is a turntable for video discs and compact discs, 27.28
is the center spindle.

Brackets 21 and 22 to which the spindle motors 23 and 24 are attached have rods 29 inserted into holes 30 of brackets 2122.
a, 30 b, 31 a, 31 b to the rod mounting holes 32 a, 32 of the main chassis 20.
b, so that the brackets t11) and 21.22 can pivot around this rod 29. It is also possible to slide in the axial direction of the rod 29.

The bracket 21.22 has rollers 33.3 as shown.
4 are provided. There is a roller receiver 35 that supports the rollers 33 and 34.

By raising and lowering the roller 33 or 34, the bracket 21 or 22 is rotated around the rod 29, thereby raising and lowering the spindle motor 23 or 24, but a mechanism for this purpose is built into the roller receiver 35. It is.

That is, reference numeral 36 denotes a lifting arm for lifting and lowering the rollers 33 and 34, and a hole 38 of the lifting arm 36 engages with a pin 37 set in the roller receiver 35, so that it can rotate about the pin 37 as a pivot. ing.

The roller receiver 35 has an elevating cam 40 with a pin 39a,
39b and elongated holes 41a and 41b formed in the elevating cam 40
It is slidably mounted. The lifting cam 40 is provided with a cam slope 42, and the cylinder 43 of the lifting arm 36
It is in contact with

1I9) When the lifting arm 36 rotates, the bending part 44 provided at the tip of the lifting arm 36 closes the bracket 21 or 2.
The second roller 33 or 34 is raised and lowered.

A pickup 45 for reading recorded signals from the disk is attached to a carriage 46 for movement in the radial direction of the disk (in the y-axis direction in FIG. 1). The carriage 46 is 2
It is designed to slide on book guide rails 47° and 48.

A rack gear 49 is provided on the carriage 46 and is driven by a pinion gear 50.

The pinion gear 50 is a reduction gear 51a, 51b, 51
It is designed to be driven by the worm gear 53 of the feed drive motor 52 of the pickup 45 via the drive motor 52 of the pickup 45.

The ends of the guide rails 47, 48 on the inner circumferential side of the disk are fitted into elongated holes 54, 55 provided in the main chassis 20, and can be moved a certain distance in the vertical direction (Z-axis direction). ing.

There is a disk clamper 56 at the top of the position near the center of the main chassis 20 where the disk is loaded, which acts to hold down the disk from above.
6 is rotatably suspended from a clamper support plate 57.

The left and right ends of the clamper support plate 57 are connected to the main chassis 2.
Fixed to 0.

Incidentally, when loading a disc, the spindle motors 23 and 24 for the video disc and the compatible disc must be selected according to the type of disc and moved to the position where the disc is loaded.

A selection moving means for this purpose is rotatably attached to the main chassis 20 by a motor switching arm 58 with a pin 59.

A crank arm 60 is configured to rotate around a shaft 61 in order to rotate the motor switching arm 58.
A pin 62 is installed at the tip of the crank arm 60 and engages with a long hole 63 of the remoter switching arm 58.

Therefore, when the crank arm 60 rotates, the motor switching arm 58 rotates by a predetermined angle about the pin 59 as a fulcrum.

The motor switching arm 58 is prevented from moving the brackets 21 and 22 via a connecting plate 64 provided at its tip.

A pin 64 at the tip of the connecting plate 64 engages with an elongated hole 66, 67 in the bracket 21-22.

Next, the most characteristic part of the present invention will be explained.

Regarding this part (see Figures 1, 10, and 16).

Roller 3 at the tip of bracket 21.22 of roller receiver 35
Positioning guides 115a, which are the holding means of the present invention, are provided at the portions facing the recording/reproducing positions No. 3 and 34.

115b is provided.

These positioning guides 115a and 115b are arranged so that when the brackets 21 and 22, which are subshafts, rotate to the recording and reproducing position, the rollers 33 and 34 move to the positioning guide 115a.
, 115b, it is possible to prevent vibration even when the recording disk is likely to vibrate due to imbalance during recording and reproduction.

These positioning guides 115a and 115b are provided with rollers 33,
Since the positioning guides 115a and 115b are used to guide both sides of the recording disk, they are particularly useful for preventing vibrations in the direction along the plane of the recording disk. It is particularly effective against vibrations that are harmful to recording and reproduction.

The disk tray 10 shown in FIG. 2 is taken in and out in the y-axis direction in FIG. 1, and a tray guide roller 68a is used for this purpose.
, 68b are provided inside the main chassis 20. (A tray guide roller is also provided inside the side surface of the main chassis 20 facing this.) There is a rack 69 that has the function of transporting the disk tray 10 by a motor drive and raising and lowering the spindle motors 23 and 24.

The rack 69 has long holes 70 and 71 and is supported by guide pins 72 and 73 so that it can move in the y-axis direction.

The rack 69 can be moved by a pinion gear 74 from a drive motor via a speed reduction belt and gears.

A bridge portion 74 between elongated holes 70 and 71 of the rack 69 can engage with a notch 76 of a lifting lever 75 for lifting and lowering the spindle motors 23 and 24. In a predetermined section of the operating stroke of the rack 69, the bridge portion 74 and the notch portion 76 engage with each other, so that the movement of the rack 69 is transmitted to the elevating lever 75.

The lift lever 75 is supported by a support pin 75' and rotates around this support pin 75'.

The elevating lever 75 is provided with a long hole 77, which engages with a pin 78 set on the elevating cam 40. As a result, the movement of the lift lever 75 is converted into a sliding movement of the lift cam 40 in the X-axis direction, and the spindle motors 23, 24
The lifting and lowering operations are performed.

3, 4, and 5 show the configurations of some mechanisms whose descriptions are omitted in FIG. 1 to avoid complication.

The crank arm 60, which functions to switch the spindle motors for compact discs and video discs by moving them to the position where discs are loaded, is connected from a switching drive motor 81 to a worm gear 82. as shown in FIG. Worm wheel 83, small gear 84. The rotational motion is transmitted through deceleration by the large gear 85, etc., and the position of the spindle motors 23, 24 is changed.

When loading the disc, spindle motor 2
3 and 24 rise from below the disk and lift the disk from the disk tray 10. At this time, the guide rails 47.4 of the pickup 45
Hold the edge of the No. 8 disc slightly toward the center and lift it up. As shown in FIG.
．． The front end of 48 is the elongated hole 5 provided in the main chassis 20.
4゜55, but this guide rail 47゜48
The front ends of the rails further engage holes 87 and 88 in the rail support plate 86. The rail support plate 86 is connected to the main chassis 2.
It is engaged with the notch 89.90 of 0, and can slide in the Z-axis direction.

Further, a leaf spring 91 is attached to the rail support plate 86 as shown in FIG.

The brackets 21 and 22 in FIG. 1 have protrusions that come into contact with the left and right ends 92a and 92b of the leaf spring 91 of the rail support plate 86 and push them when the brackets 21 and 22 are raised. Sections 93, 94, 95°96 are provided.

When the protrusion 93.94 or 95.96 presses down the leaf spring 91, the front end of the guide rail 47.48 of the pickup 45 moves into the elongated hole 54, 5 of the main chassis 20.
5, so that the position of the pickup 45 in two axial directions can be determined reliably.

The disc tray 10 is taken in and taken out from the main body of the playback device, but as shown in FIG. 6(a), the section S from the state where it is stored in the main body of the total stroke S of taking in and out is carried out by the motor drive by the rack 69, and the rest is The S-s section is manually inserted and removed.

Therefore, there are two states: a state in which the disc tray 10 and the rack 69 move together, and a state in which the disc tray 10 is disengaged from the rack 69 and only the disc tray 10 is moved manually.

Therefore, the mechanism for coupling and disassociating the disk tray 10 and the rack 69 is
They are provided on the 0 side and the rack 69 side. This will be explained with reference to FIGS. 2 and 5.

Reference numeral 106 in FIG. 2 denotes a roller arm, which is attached to the lower surface of the disk tray 10 by a support fitting 107.

One end 108 of the roller arm 106 is formed into a roller (or cylindrical shape). The other end is engaged with a support fitting 107 with a pin 109 parallel to the X axis.
It becomes possible to rotate around the axis (1!lI).

FIG. 5 shows a counterpart mechanism related to this. The rack 69 in FIG. 5 has pins 72.73 engaged in elongated holes 70.71 so as to be slidable in the y-axis direction. The pins 72 and 73 are mounted on a bracket 97 fixed to the main chassis 20.

The bracket 97 is provided with a roller holder 98 that serves to guide and hold the roller 108 of the disk tray 10 described above.

The bracket 97 is provided with an elongated hole 99 to prevent the elevating lever 75 shown in FIG. 1 from interfering with the bracket 97.

In FIG. 5, the rack 69 is driven by a pinion 74, and the pinion 74 is driven by the gears 100, 1.
01, pulleys 102, 103, belt 104, etc., the rotational force is transmitted by being decelerated from a drive motor 105.

The operation of the recording disc reproducing apparatus of the present invention having the configuration as described in -1- will be explained below.

(tU) (1) Loading a disc As shown in FIG. 6(a), pull out the disc tray 10, place the disc 200 on it, and push in the disc tray 10.

Assuming that the stroke of putting in and taking out the disc tray 10 is S, if you manually move the section S-6, then the remaining S
In this section, the disk tray 10 is automatically conveyed by a motor drive.

As shown in FIG. 7(a), when the roller 108 of the disk tray 10 is pushed to near position A, the position of the disk tray 10 is detected by a sensor (not shown), etc., and the rack drive motor is activated. 105 (FIG. 5) is started, and the rack 69 begins to move as shown in FIG. 7(b). Disk at this time!・The roller 108 of the ray 10 is
) as shown in the roller guide 110 and the recessed part 111 of the rack.
The disk tray 10 is stuck in the rack 6 and cannot escape from the recess 111.
It will be moved together with 9.

The roller 95 is connected to the roller guide 110 in FIG. 7(e).
It falls into the recess 112 of the rack, stops, and advances a little further by 69 racks.

The position of the roller 108 at this time is such that the disc tray 10 is completely housed in the main body of the playback apparatus.

(2) Turntable switching operation When the position of the rack 69 is detected by a sensor, a microswitch (not shown), etc. in the state shown in FIG. 7(C), the rack drive motor 105 is temporarily stopped.

Then, the playback device uses a sensor (not shown) to determine the type of the disc based on the difference in diameter of the discs placed on the disc tray 10, and the spindle motor 23 or 24 suitable for rotating the disc is activated to rotate the disc. The switching operation of the bracket 21 or 22 is performed so that the bracket 21 or 22 is located at the center of the bracket.

That is, the switching drive motor 81 shown in FIG. 3 operates, and the large gear 85
Rotation is transmitted to the crank arm 60, which is engaged with the crank arm 60, which rotates. And the motor switching arm 58 in FIG.
swings to the state shown in Figures 8 and 9. As a result, the brackets 21 and 22 to which the spindle motors 23 and 24 for the video disc and the compact disc are attached are guided by the rod 29 and slide in the X-axis direction, as shown in Fig. 8 or 9. A switching operation is performed to either state. Then move on to the next step.

Of course, if the type of the disk placed on the disk tray 10 matches the type of the spindle motor located at the center of the disk, there is no need to switch the spindle motors 23 and 24, and the next operation is performed as is. Let's move on to the steps.

(3) Lifting operation of the turntable When the spindle motor 23 or 24 corresponding to the disc type is selected in the state shown in Fig. 6(a), the spindle motor 23 or 24 rises as shown in Fig. 6(b). lift the disc from the disc tray 10 and press it against the disc clamper 56.

At the same time, the rail support plate 86 shown in FIG.
94 or 95.96 (see FIG. 1) and push the guide rails 47 and 48 upward against the upper ends of the elongated holes 54 and 55 of the guide rail receivers of the main chassis 20.

In this way, the pickup 45 is also lifted, and the relative height to the disk being lifted by the spindle motor 23 or 24 is maintained at a specified height, and the disk is loaded. .

The lifting operation of these spindle motors 23 or 24 will be explained using FIG. 1 and FIGS. 10 to 14.

The back side of the roller receiver 35 shown in FIG. 1 has a shape as shown in FIG. 10. When moving the spindle motor 23 or 24 for video discs or compact discs to the disc center position, the brackets 21 and 22 are connected to the rod 2.
Bracket 2 slides in the X-axis direction guided by 9.
1. The roller 33 or 34 at the tip of 22 is the roller receiver 35
is guided in the X-axis direction by the sill portion 113 of. The roller receiver 35 has a holding piece 1 that holds the rollers 33 and 34 so that the brackets 21 and 22 do not move unnecessarily in the two axial directions.
14a and 114b are provided. Furthermore, roller receiver 35
Positioning guides 115a and 115b, which are the most characteristic components of the present invention, are formed in the spindle motor 2, which is selected according to the type of disk and moved to the center.
Positioning guides 115a and 115b are used to position the rollers 33 and 34 of the brackets 21 and 22 so that when the spindle motors 23 and 24 are raised, the spindle motors 23 and 24 are accurately positioned in the X-axis direction and do not vibrate during recording and playback.
I try to keep it in place.

The spindle motor 23 or 24 is driven up and down by a motor 105 (see FIG. 5) for transporting the disc tray 10, and the disc tray 1o is moved to the main body of the playback device by the operations shown in FIGS. 7(a) to (C). After the spindle motor 23 or 24 is selected and changed over, the spindle motor 23 or 24 is moved up and down.

The disk tray 1 is
0 remains housed in the playback device, and the rack 69 is moved.

As a result, as shown in FIG. 13, the elevating lever 75 is rotated by the bridge portion 79 of the elongated holes 70, 71 of the rack 69 from the state shown by the two-dot chain line to the state shown by the solid line.

The rotation of the elevating lever 75 moves the pin 78 of the elevating cam 40 by a stroke L shown in FIG. When the elevating cam 40 is moved as shown in FIGS. 11 and 12, the cylinder 43 of the elevating arm 36 is pushed up by the cam slope 42, and the elevating arm 36 rotates about the pin 37, as shown in FIG. It moves as shown in (b). The bent portion 44 at the tip of the lifting arm 36 lifts the roller 33 at the tip of the bracket 21 or 22.

Due to this operation, the movement of the rack 69 causes the bracket 2 to
1 is lifted, and the spindle motor 23 and turntable 25 are lifted. And at the same time, the first
According to the configuration shown in the figure, when the bracket 21 or 22 is raised by 1", the front ends of the guide rails 47, 48 are lifted, and the pickup 45 is also raised by 1".

In this way, the disk and the pickup 45 are lifted as shown in FIG. 6(b), and the disk floats up from the disk tray 10 and is held between the disk clamper 56 and the turntable 25 or 26 in a rotatable state. The disc will then be loaded.

(4) Disk unloading operation The information reproduction operation is performed by rotating the disk at a predetermined speed and driving the pickup 45 along the guide rails 47 and 48 with the feed drive motor 52. To remove the disc after playback is complete, the reverse operation of loading the disc is performed. The rack 69 is moved from the position shown in FIG. 7(d) to the position shown in FIG. 7(C).

As a result, the state changes from FIG. 12(b) to FIG. 12(a), and the spindle motor 23 or 24 descends to
Or 22 rollers 33 or 34 are supported by the rail portion 113 of the roller receiver 35 shown in FIG. 10 (2R).

The pickup 45 is also raised to a slight height during loading, but when the bracket 21 or 22 is lowered, the pickup 45 is also lowered and returns to the state shown in FIG. 6(a).

As a result, the disc returns to the state on the disc tray 10 again. The rack 69 is then driven from the state shown in FIG. 7(C) to the state shown in FIG. 7(a). and disk tray 1
0 is pulled out to the S position by motor drive. From this state, the disc tray can be manually pulled out to the S position to remove the disc.

After removing the disc, when the disc tray is manually pushed to the S position, the rack 69 is driven to the states shown in FIGS. 7(a) to 7(e), and the disc tray 10 is stored in the playback device.

One way to move the disk tray in and out is to use a motor drive for only the section S of S in Figure 6, and manually move the remaining sections S-S, but there are other methods [7]
It is also conceivable to use motor drive for the entire stroke S.

In this case, as shown in FIG. 15, an independent drive motor 120 is provided to drive the spindle motor up and down, rather than being used also as a motor for transporting the disk tray. And warm 121. Worm wheel 122. The rack 12'4 provided on the elevating cam 40 is driven by decelerating with a pinion gear 123 or the like.

This eliminates the need to manually open and close the disc tray 10, further improving operability. Since the rack 69 for transporting the disc tray 10 can be integrally constructed with the disc tray 10, the number of mechanisms related to transporting the disc tray can be greatly reduced as follows.

The specific thing that will be reduced is the disk tray 10 in Figure 2.
Roller arm 106° support fitting 107 provided in
．． Roller 108. Pin 109. Pins 72, 73° bracket 97 supporting rack 69 in FIG. Roller holder 98. Furthermore, FIG. 13 shows the elevator lever 75. Support pin 7
5', pin 78, etc.

Next, FIGS. 17 to 19 are partially enlarged views showing other embodiments of the most characteristic part of the present invention.

This other embodiment differs from the embodiment shown enlarged in FIGS. 10 and 16 above in that a leaf spring 116, which is an elastic member, is provided to more reliably position and hold the rollers 33, 34. That's true.

This leaf spring 116 is, for example, one of the positioning guides 11
5a side to press the rollers 33 and 34 toward the other positioning guide 115b side. Of course, the positioning guide 115a is omitted and the leaf spring 116 is
may also be used as a guide.

By providing the elastic member (plate spring 116) in this way, the position of the brackets 21, 22 (subshear) can be held more reliably, and the vibration prevention effect is also improved.

Note that the holding means that is the most characteristic feature of the present invention is not limited to the actual flow side. That is, in the above embodiment, the positioning guide 1 for maintaining the position of the rollers 33 and 34 provided at the tips of the brackets 21 and 22 is used.
15a and 115b were provided, but the bracket 1-21.2
It is clear that retaining means may also be provided to hold the brackets 21, 22 in such a way that they directly position the subchassis 2 (subchassis).

In addition to the leaf spring 116, the elastic member may be a coil spring or the like.

In addition, loading and unloading operations are performed by rotating the sub-chassis brackets 21 and 22 within a small angle range, eliminating the need for the conventional lifting and lowering operations of the lifting plate and disk clamper, making the mechanism simple. Become.

[Effects of the Invention] As described in detail above, according to the present invention, a recording disk reproducing device can be obtained that has a small number of parts, can have a simple loading mechanism, and can perform stable recording and reproducing even against vibrations. It will be done.

[Brief explanation of drawings]

FIG. 1 is a structural exploded perspective view of a recording disk reproducing apparatus of the present invention, FIG. 2 is an external perspective view of a disk tray of the present invention, and FIGS. 3 to 5 are partial structural exploded perspective views of the present invention. , 6th
7 is a detailed explanatory side view and rear view of the present invention, FIGS. 8 and 9 are structural perspective views according to the present invention, and FIG. 10 is a detailed illustration of the present invention. FIGS. 11 and 12 are partial perspective views of the holding means of the invention; FIGS. 11 and 12 are partial top views and rear views of the invention; FIGS. 13 and 14 are partial top views and side views of the invention; FIG. 15 is a partial rear view of another embodiment of the present invention, FIG. 16 is a schematic perspective view of the holding means of the present invention, and FIGS. 17 to 19 are views of the holding means of the present invention. A schematic perspective view, a schematic top view, and a schematic front view to show other embodiments; FIGS. 20 and 21 are external views of the conventional apparatus and the present invention; FIGS. 22 to 24 are the conventional apparatus. 25 is a perspective view illustrating a conventional disk clamper portion; FIG. 26 is a schematic perspective view of a conventional improved recording disk reproducing device; FIG. 27 is a diagram showing the shapes of disks in various formats. It is a comparison diagram. DESCRIPTION OF SYMBOLS 10... Disk tray, 20... Main chassis, 21, . 22...Bracket (subchassis), 2
3゜24... Spindle motor, 25.26... Turntable, 29... Rod, 36... Elevating arm, 4°... Elevating cam, 45... Pickup (optical head device), 47 .48...Guide rail, 56...
・Disc clamper 58...Motor switching arm,
81... switching drive motor, 115a, 115. b...
・Positioning guide (holding means), 116...plate spring (
elastic member).

Claims (5)

[Claims] (1) A main chassis, a sub-chassis supported so as to be movable up and down relative to the main chassis, a turntable placed on the sub-chassis and rotated by a motor, and a turntable rotatably attached to a stationary part. a disc clamper; an elevating means for elevating the sub-chassis to clamp or release the recording disc between the disc clamper and the turntable; a holding means provided on the stationary part for holding the position of the sub-chassis in a direction substantially parallel to the plane of the recording disk when the sub-chassis is moved up to A recording disk reproducing device comprising: an optical head device; (2) The recording disk reproducing apparatus according to claim 1, further comprising an elastic member that elastically presses and holds the position of the subchassis. (3) The recording disk reproducing apparatus according to claim 1, wherein the elevating and lowering operation means is performed by rotatably mounting a roller on the sub-chassis and sliding an elevating and lowering cam means that comes into contact with the roller. (4) The recording disk reproducing apparatus according to claim 3, wherein the elevating cam means is slidable along the width direction of the main chassis. (5) The recording disk reproducing apparatus according to claim 3, wherein the holding means is a guide member provided so as to come into contact with both sides of the roller and sandwich the roller.