JP2729878B2 - Disc playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

[0001] The present invention is a method of forming an equal angular interval around a rotation center axis.
Discs with trays with multiple disc mounting sections
Raw device, a disk on an adjacent disk mount
The present invention relates to a disc reproducing apparatus in which competitors overlap.

[0002]

2. Description of the Related Art Recently, a disk reproducing apparatus for optically reproducing information recorded on a disk recording medium has been widely used. In particular, there has been a remarkable spread of a disk reproducing apparatus for reproducing music information recorded on a disk recording medium having a diameter of 12 cm or 8 cm, that is, a so-called CD (compact disk). This type of disk reproducing apparatus, typically those of the type subjected to playback loaded one by one CD, in advance from a plurality of magazines CD is loaded (disk cartridge) one by one the CD There is a type that is selected and provided for reproduction.

[0003] using a rotary tray for placing side by side at equal angular intervals three CD around a rotation axis recently, the rotation tray by the rotation control by 120 °, placed therein CD A so-called carousel-type disc reproducing apparatus, which is alternatively provided for reproduction, has also been developed.

A disk reproducing apparatus using a rotating tray of this kind has an advantage that its operation is relatively simple. However, on the other hand, the rotating tray needs to have a size (diameter) on which three CDs are arranged in a plane, and the overall size of the disc reproducing apparatus, particularly the width, cannot be denied. . Therefore, multiple sheets are placed on the tray.
CDs are placed so that adjacent CDs overlap each other.
As a result, the diameter of the tray is reduced, and
Attempts have been made to reduce the size of the entire raw device.

[0005]

However, there are multiple copies on the tray.
If a number of CDs are stacked on top of each other,
Take them in order from the top and put them in order from the bottom
After all, when you change the CD,
The upper part, at least the upper part of all disc loading parts, is open.
Need to be done. However, there is no disc on the playback unit.
Clamper and clamper support for supporting the clamper
Are placed, so that the upper part of all the disc
The tray must be moved horizontally to open
No. However, if you do so, the tray will move horizontally
Space for the disc player.
Miniaturization is prevented. Moreover, a tray that can be rotated and raised and lowered
When trying to move freely in the horizontal direction, the tray drive
The structure is complicated and large, which is also a small disk playback device.
This is a disadvantage for shaping.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a highly practical disk reproducing apparatus which has a simple structure and is compact.

[0007]

According to the present invention, there is provided a disc reproducing apparatus for superposing a plurality of discs around a rotation axis.
Was rotatably the rotary tray having a plurality of disk placing portion for placing at equal angular intervals, and vertically movable support,
After this the carousel is rotated by a predetermined angle in the raised position alternatively to face the upper of the playback unit disk mounting portion, the phase of this carousel relative to the playback unit
On the other hand, while lowering to the turntable position, and interlocking with the movement of the rotating tray or the playback unit, the clamper for holding the disc between the turntable of the playback unit and the disc loading section is opened. The disk is moved from a retractable position at which a disk can be exchanged to a clamp position above a central portion of the disk mounting portion.

In particular, the rotation of the rotary tray and its vertical movement,
And the movement of the clamper is linked to each other by the rotation of one rotating body to perform a synchronous operation.

[0009]

According to the disk reproducing apparatus having such a structure,
Rotation control only by rotation of the rotary tray of the cam gear, said tray
And the reproduction unit can be operated in cooperation with each other, and the movement of the clamper can be linked to each other, so that a plurality of discs on the rotating tray can be selectively provided for reproduction by a simple control. In addition, when the rotating tray is in the raised position, the clamper is moved to the retracted position and the upper part of the disc mounting portion is opened for disc replacement, so that the disc can be easily attached to and detached from the rotating tray without being obstructed by the clamper. Can be done.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a disk reproducing apparatus according to an embodiment of the present invention. First, a rotating tray for loading a disk used in the apparatus of this embodiment will be described. Carousel are incorporated rotatable by a predetermined angle in the disk reproduction apparatus main body, the rotation axis a plurality of discs placed around the compact disc (in this case; CD) to the turntable mechanism and an optical head mechanism or the like The recording information is optically reproduced by alternately facing the reproducing unit composed of.

FIG. 1A shows a plan view of a rotary tray for loading a disk according to this embodiment, and FIG.
1 schematically shows a cross-sectional structure of a portion indicated by a dashed line A in FIG. The rotating tray shown in this embodiment has three CDs having a diameter of 12 cm placed thereon, and has a rotating shaft 1a at the center of the lower surface of a disc-shaped tray body 1 formed of a synthetic resin material. I have. Then, on the upper surface of the tray body 1,
Three disk mounting parts for mounting each CD
2, 3, and 4 are formed as circular recesses at equal angular intervals (120 ° intervals in this example) around the rotating shaft 1a.

Each of the disk mounting portions 2, 3, and 4 is a circular concave portion having an inner diameter W, and the height of the inner bottom surface of the concave portion.
(Depth). In particular, these disk mounting portions 2, 3, and 4 are arranged such that the respective storage regions partially overlap each other avoiding the circular holes 2a, 3a, and 4a for inserting the turntable formed at the center positions of the mounting regions. Then, each circular recess is formed continuously with a step.

The inner diameter W of each circular recess is defined as D, the outer dimension of the CD, and the center deviation allowable dimension of the disk clamp by the turntable (the allowable amount of the positional deviation of the CD with respect to the turntable capable of securely clamping the CD). ) d is set as (D + d) when d is considered as a margin for mounting the disk.

Further, as shown in FIG. 2, the step H between the inner bottom surfaces of the respective circular recesses is defined by the thickness of the CD 11 as T, as shown in FIG.
a, 3a and 4a are inserted in the turntable 12
The height dimension for lifting the CD 11 on the 2, 3, and 4 is t1, in order to maintain a non-contact relationship with another CD 13 which is placed on the upper disk loading portion and is located above at this time. The gap size is t
2 and (T + t1)
+ T2).

Therefore, the three disk mounting portions 2, 3, and 4 are located at a step H (= T + t1 +
t2), a circular recess is formed deeper, and the middle stage
3, and a further step H (=
A circular recess is formed deeper by (T + t1 + t2), and is formed as the lower disk mounting portion 4. At this time, the depth of the circular recess forming the upper disk mounting portion 2 may be set to the above-mentioned step size H, but since a CD is not provided above it, basically, the disk mounting portion 2 is not provided.
It is sufficient that the height of the above-described CD is about the height t1 of the CD. In FIG. 2, 1
Reference numeral 4 denotes a clamper for holding the CD 11 between the turntable 12 and the turntable 12.

In this way, by providing the steps and avoiding the circular holes 2a, 3a, 4a, the respective storage areas are partially overlapped to form a continuous circular concave portion, so that the circular concave portion is formed around the rotary shaft 1a. According to the rotating tray provided with three disk mounting portions 2, 3, and 4 at equal angular intervals, CDs are sequentially loaded from the lower disk mounting portion 4 to the middle and upper disk mounting portions 3, 2. As shown in FIG. 3, these three CDs 7, 8, and 9
Rotating pinched portions 7a, 8a, 9 at the center of the disc of each of CDs 7, 8, 9
The parts are stored on the rotating tray in a partially overlapping state, avoiding each of a.

Then, the rotating tray is moved around the rotating shaft 1a.
When the disc is rotated by 20 °, one of the disc mounting sections 2, 3, and 4 is sequentially moved to the position of the reproducing unit, and the CDs 7, 8, and 9 mounted thereon are selected by the reproducing unit. They are arranged to face each other. In this state, for example, if the reproducing unit is raised to the rotating tray side by a predetermined height, or if the rotating tray is lowered to the reproducing unit side by a predetermined amount, the disk mounting portions 2, The CDs 7, 8, 9 placed on the slots 3, 4 are lifted by the above-described height dimension t1 by the turntable which is inserted from below the rotary tray through the circular holes 2a, 3a, 4a. And CD7,8,9
Is the clamper 14 and the turntable 12
, And is rotationally driven to be used for information reproduction by the optical head.

Here, the rotating tray and the turntable 12 are used.
By moving the turntable 12 through the circular holes 2a, 3a, and 4a and entering the upper surface side of the rotating tray by the relative movement in the height direction with respect to the height of the disc, the amount of movement of the disc mounted on the disc facing the reproducing unit is increased. Needless to say, it is determined according to the depth of the inner bottom surface of the recesses of the placing portions 2, 3, and 4. More specifically, the turntable moves extra by the height of the step H when the middle disc placement unit 3 faces the playback unit as compared with the case where the lower disc placement unit 4 faces the playback unit. When the upper disk mounting portion 2 is opposed, the turntable is further moved by the step H, that is, by 2H. As a result, each disk mounting part 2,
The CDs 7, 8, and 9 placed on the CDs 3 and 4 are lifted by the height t1 from the bottom surfaces of the concave portions, respectively, and provided for reproduction.

The above-mentioned circular holes 2a, 3a, 4a are provided for
Needless to say, holes having a diameter that allows the turntable to pass therethrough are provided corresponding to the rotation holding portions 7a, 8a, and 9a of 8, 9. The optical head is mounted on each disc
Each of the disk mounting portions 2, 3, and 4 is formed from the circular holes 2a, 3a, and 4a of the circular holes 2b, 3b, and 4b formed toward the outer peripheral side of the tray.
CDs 7, 8, and 9 placed on 4 are to be played.

The shapes of the slots 2b, 3b, 4b and the positions of the disc mounting sections 2, 3, 4 are determined by the shape and structure of the optical head mechanism in the reproducing unit, the mounting position of the reproducing unit on the rotating tray, and the like. It is needless to say that it is determined according to the specification. For example, the circular holes 2a, 3a, 4a for inserting the turntable and the groove holes 2b, 3b, 4b for allowing the optical head to face the disk may be formed as one continuous long hole.

By the way, as shown in FIG. 4, the upper end of the inner peripheral surface of the concave portion of the upper disk mounting portion 2 is in contact with the inner peripheral surface of the concave portion of the other disk mounting portions 3 and 4, as shown in FIG. From the bottom surface to the bottom surface, a protrusion that forms an inward slope and protrudes inward is formed as a disk retaining protrusion 5.

The amount of protrusion of the end of the disk retaining projection 5 is determined, for example, by setting the inner diameter W of the circular concave portion forming the disk mounting portion 2 to about the aforementioned margin d defined in relation to the disk diameter D. ing. The height h of the end of the disc retaining projection 5 from the inner bottom surface of the recess is set slightly lower than the height because the lift height of the CD 7, 8, 9 by the turntable is t1 as described above. Is done.

Thus, such a disk retaining projection
Numeral 5 is for preventing the CD 7 from being shifted from the disc mounting portion 2 in the lateral direction. That is, in the rotating tray on which the three disks are partially overlapped and placed as described above, as shown in FIG. 5, the inner peripheral surface of the concave portion of the disk placing portion 2 is adjacent to the concave portion. Other disk mounts 3, 4 to be formed
It is greatly reduced by. As a result, the opening width P of the inner peripheral surface of the concave portion of the upper disk mounting portion 2 may exceed the disk diameter D depending on the inner diameter margin dimension d and the overlapping amount of the mounting area. In this case, the CD 7 on the disk mounting portion 2 slides laterally through this opening,
There is a possibility that the discs may shift to the other disc mounting units 3 and 4.

However, even in such a case, according to the above-described disk retaining projection 5, the opening width can be reduced by the amount of inward projection to make the opening diameter smaller than the disk diameter D. It is possible to effectively prevent the CD 7 from falling off. In addition, the height of the disc retaining protrusion 5 is the lifting height t of the CD 7 by the turntable.
Because it is kept lower than 1, C on the turntable
When the D7 is clamped and rotated, the disc retaining projection 5 does not interfere.

The above-described embodiment is based on the premise that only a CD having a diameter of 12 cm is mounted.
D can also be configured to be able to be placed. In this case, as shown in FIG. 6, circular recesses 2c, 3c, 4c for an 8 cm diameter CD may be formed coaxially on the inner bottom surfaces of the disk mounting portions 2, 3, 4, respectively. These circular recesses 2c, 3c,
The depth 4c from the bottom surface of the concave portion of each of the disk mounting portions 2, 3, 4 may be any depth that is small enough to restrict the displacement of a CD having a diameter of 8 cm. When the depth of each of the circular recesses 2c, 3c, and 4c is t3, each of the disk mounting portions 2,
The step H between steps 3 and 4 may be set as (T + t1 + t2 + t3).

In this case, the same disk retaining projection 5 as the disk retaining projection 5 described above is also provided on the inner peripheral surface of the concave portion of the circular concave portion 2c adjacent to the inner peripheral surface of the concave portion of the other disk mounting portions 3, 4. Needless to say, it is only necessary to form 6.

The disk reproducing apparatus according to the present embodiment using the rotating tray having the above-mentioned shape is schematically configured as shown in FIG.

A plurality of disk mounting sections 2, 3, 4
Are formed at equal angular intervals and are rotatably provided at a substantially central position on a chassis 22 forming the apparatus main body, and are provided to be vertically movable. In addition, a turntable mechanism and an optical head mechanism are provided at a portion (upper side in FIG. 7 in this example) of the lower surface of the chassis 22 facing one of the disk mounting portions 2 , 3 , and 4 of the rotating tray 21. Playback unit 23
However, the turntable faces one of the circular holes 2a, 3a, 4a of the disc mounting portions 2, 3, 4 and the optical head is
It is positioned and fixedly provided so as to be movable along one of b and 4b. In other words, the rotation of the rotation tray 21 causes the disc mounting units 2, 3, and 4 to rotate by the rotation thereof.
Alternatively, it is provided rotatably and vertically movable at a position opposing to it.

The chassis 22 has a rotating tray.
A clamper support 25 is provided on the side of 21 so that its base is rotatable and vertically movable. The clamper support 25 is a turntable of the reproducing unit 23.
A clamper 24 for holding the discs on the disc mounting sections 2, 3, and 4 is supported at its distal end (rotational end) between itself and the disc mounting section 12. The clamper support 25 moves the clamper 24 and itself to a retracted position that is always on the side of the rotary tray 21 by the rotation and the vertical movement of the clamper support 25, and the disc mounting portions 2a, 3a, and 4a of the rotary tray 21 are moved . The upper part is opened so that the disc can be exchanged, and at the time of disc reproduction, the clamper 24 is moved above the disc mounting portions 2a, 3a, and 4a that are selectively opposed to the reproduction unit 23, and Between the disk mounting portions 2a, 3a, and 4a.

FIG. 8 is a plan view showing a drive system of the rotary tray 21 and the clamper support 25. Reference numeral 26 denotes a motor as a drive source. The rotational force of the motor 26 is transmitted from a small-diameter gear 26a fixed to the rotating shaft to a cam gear 28 that moves the rotary tray 21 and the clamper support 25 up and down via a reduction gear 27. Rotational force from the motor 26 transmitted to the cam gear through the toothless gear 29 formed integrally on the rear surface of the cam gear 28, is transmitted to the gear 30 for rotating the carousel 21 by a predetermined angle.

The gear 30 is connected to the rotating tray 21 so as to be rotatable integrally with the rotating tray 21, and has three cam grooves 30a engaging with the ratchet mechanism 31 on its lower surface at equal intervals in the circumferential direction. (At 120 ° intervals). And gear
Each time the gear 30 is engaged with the toothless gear 29 and rotated through 120 °, it is positioned at the rotational position by the ratchet mechanism 31. Rotation of each 120 ° of the gear 30, the rotating tray 21 as described later are times <br/> rotation by 120 °, the disk loading portion 2a to the reproducing unit 23, 3a, 4a is-option They are positioned so as to face each other. Incidentally, the cam gear 28 has an external perspective shape shown in FIG.
0 (a) and (b), a first cam wall 32 whose height changes in the circumferential direction is provided on the outer peripheral side of the upper surface, as shown in a plan view,
Gear teeth 28b meshing with the reduction gear 27 are formed below the outer peripheral wall surface of the cam wall 32. Also, the first cam wall 32
Is provided with a second cam wall 33 having a cam surface whose radius changes in the circumferential direction .

The first cam wall 32 has an upper end cam surface.
To define the height position of the rotating tray 21 and the clamper support 25.
It is those that. Further, the second cam wall 33 has the above-mentioned
A central portion above the disk mounting portion 2, 3 and 4 facing the clamper support 25 and the clamper playback unit 23, the total disk
Click mounting portion 2a, 3a, is to move to the Oite horizontally between a retracted position out of the upper region of 4a.

The toothless gear 29 integrally provided on the back side of the cam gear 28 has a peripheral area corresponding to the number of disk mounting areas (3 "in this example) formed on the rotary tray 21. The gear teeth 29b selectively meshing with the gear 30 are formed at predetermined positions in these regions, respectively, except for the regions where the gear teeth 29b are formed in each region. The toothless gear 29 is rotated without meshing with the gear 30 at the toothless portion 29. The number of teeth of each of the gear teeth 29b is (の) of the number of teeth of the gear 30. When the cam gear 28 rotates 120 °, the gear
Reference numeral 30 selectively meshes with the gear teeth 29b and is driven to rotate by 120 °.

On the other hand, the aforementioned first and second cam walls 3
Reference numerals 2 and 33 divide the cam surface region into three equal parts in the circumferential direction in relation to the formation positions of the gear teeth 29b of the toothless gear 29, and form a cam surface of the same shape in each region.

That is, the first cam wall 32 is associated with the position of the toothless portion where the gear teeth 29b of the toothless gear 29 is cut off in the rotation direction (counterclockwise direction in the figure) of the cam gear 28. A cam surface having a V-shaped groove whose upper end surface changes in the height direction is formed. The second cam wall 33 connects two concentric surfaces 33a and 33b having different radii to each other in relation to the position of the missing tooth portion where the gear tooth 29b of the missing tooth gear 29 is interrupted. , A cam surface having a concave portion formed in the radial direction. A surface 33c of the concave portion forming the cam surface on the side of the cam gear 28 in the rotation direction of the cam gear 28 is formed obliquely so that a cam pin, which will be described later, which has fallen into the concave portion is gradually displaced outward with the rotation.

The first and second cam walls 32 and 33 having such a cam surface allow the cam gear 28 to have a 120
When rotating, the rotating tray 21 is moved up and down, and in connection with this, the horizontal movement and up and down movement of the clamper support 25 are performed. The action of the cam surface on the rotating tray 21 and the clamper support 25 is performed in a state where the toothless gear 29 is disengaged from the gear 30 as the cam gear 28 rotates.

That is, after the cam gear 28 rotationally drives the gear 30 to engage the gear 30 with the ratchet mechanism 31, the rotation of the cam gear 28 causes the cam tray to move up and down the rotary tray 21 by the cam surface. The horizontal movement and the vertical movement of the clamper support 25 are performed. Rotating tray by this cam gear 28
The rotational drive of the 21 and its vertical movement, and the horizontal movement of the clamper support 25 and its vertical movement are specifically performed as follows.

As shown in FIG. 11 as a schematic cross-sectional view showing the relationship between the support structure of the rotating tray 21 and the clamper support 25 and the cam surface of the cam gear 28, the rotating tray 21 protrudes from the center of the lower surface. Connect the hollow rotating shaft 1a to the chassis
An upper surface plate 22a, which forms a part of the chassis 22, is inserted therethrough, and is loosely fitted to a fixed shaft 41 protruding from a bottom plate 22b of the chassis 22, and is rotatably and vertically movable. Also this fixed axis
The gear 30 is rotatably supported at the base of 41.
The rotating tray 21 is provided with a pin fixed to the upper surface of the gear 30 in a spring receiver 42 fitted to the lower end of the rotating shaft 1a.
The gear 30a is engaged and rotates in conjunction with the rotation of the gear 30. The connection structure between the rotary tray 21 and the gear 30 via the spring receiver 42 and the pin 30a is held regardless of the vertical movement position of the rotary tray 21.

In the center of the lower surface of the rotating tray 21 where the rotating shaft 1a protrudes, the rotating shaft 21 is slightly separated from the center of rotation.
A cam pin 43 extending downward in parallel with the rotating shaft 1a is rotatably fitted to the base of the rotating shaft 1a. The tip of the cam pin 43 is in contact with the cam surface of the first cam wall 32 . The rotating tray 21 is biased downward by a compression spring 44 mounted between the spring receiver 42 fixed to the rotating shaft 1a and the upper plate 22a.

By the biasing force of the compression spring 44 and its own weight,
Carousel 21 moves up and down I mimic the cam surface of the first cam wall 32 caused by the rotation of the cam gear 28. When the cam pin 43 is located in the aforementioned V-shaped groove of the first cam wall 32, basically, the rotary tray 21 tends to descend to a height position defined by the groove bottom.

On the lower surface of the rotating tray 21, however, height position regulating members 45a, 45b for respectively defining the descending height position of the rotating tray 21 in accordance with the three disk mounting portions 2, 3, 4 described above. , 45c . These height position regulating members 45a, 45b, 45c are formed with a difference in height position corresponding to the step between the bottom surfaces in the recesses of the disk mounting portions 2, 3, 4 described above. The height position regulating members 45a, 45b, 45c are:
When the rotating tray 21 descends following the cam surface of the first cam wall 32, the rotating tray 21 contacts the height position reference member 46 provided on the upper surface plate 22a to define the descending height position of the rotating tray 21. Is what you do.

As a result, the rotating tray 21 is positioned at the height position defined by the height position regulating members 45a, 45b, 45c in accordance with the disk mounting portions 2, 3, 4 facing the reproducing unit 23. Is lowered to The lower position of the rotating tray 21 is such that the turntable 14 of the reproducing unit 23 fixedly attached to the upper surface plate 22a has the disk mounting portions 2, 3,.
It is needless to say that the disc is set as a position for lifting the disc mounted on 4 by the height t1 from below.

The vertical movement of the rotary tray 21 by the first cam wall 32 of the cam gear 28 is related to the rotation of the rotary tray 21 by 120 ° by the gear 30, and the rotation of the rotary tray 21 Blocked, that is, the disc mount
This is performed during the period in which the positions 2, 3, and 4 are alternatively positioned to face the reproducing unit 23. In other words, the rotating tray 21
Is rotated in one direction by 120 ° by the gear 30 when held in the upper position by the first cam wall 32. Then, the rotation of the rotating tray 21 and the vertical movement to the height position defined according to the disk mounting portions 2, 3, and 4 are alternately repeated.

On the other hand, the clamper support 25 is
As shown in (a) and (b), a rotating shaft 25a protruding from a support portion inserted into the lower surface side of the rotating tray 21 is supported on the upper surface plate 22a so as to be vertically movable and rotatable. Have been. The clamper support 25 is constantly biased downward by a compression spring 48 interposed between a spring receiver 47 fitted to the tip of the rotation shaft 25a and the lower surface of the upper plate 22a. The tip is in contact with the cam surface of the first cam wall 32.
The contact portion of the rotating shaft 25a with the cam surface of the first cam wall 32 is exactly 120 ° with respect to the portion where the cam pin 43 of the rotary tray 21 contacts the cam surface of the first cam wall 32. Defined as different positions. As a result, the clamper support 25
Is moved up and down simultaneously with the up and down movement of the rotating tray.

However, the clamper support 25 is not provided with a position regulating member for defining the lowering height position as seen in the rotary tray 21, and the lowering height position will be described later. It is defined by the height position of the turntable 12 of the reproducing unit 23.

A cam pin 49 of the clamper support 25 projecting downward from the tip of the support portion is provided so as to be able to abut on the outer peripheral wall of the second cam wall 33. The clamper support 25 is rotationally urged by a spring (not shown) so that the cam pin 49 comes into pressure contact with the outer peripheral wall of the second cam wall 33.

Therefore, the cam pin 49 is large in the second cam wall 33.
When pressed against the diameter surface 33a, the clamper support 25 and the clamp
Damper 24 retreats from the position above all of the disc loading sections 2, 3, and 4.
And the cam pin 49 presses against the small-diameter surface 33b of the second cam wall 33.
When touching, the clamper 24 selects the disc mounts 2, 3, and 4.
Is located at a position above the center (No. 9
And FIG. 12). That is, the rotation of the second cam wall 33
Accordingly, the clamper support 25 rotates horizontally.

The area of the small-diameter surface 33b of the second cam wall 33 is determined in relation to the position where the V-shaped groove of the first cam wall 32 is formed. The clamper 24 is positioned above the center of the disk mounting portion of the rotary tray 21 only during a period in which it is moved up and down by the V-shaped groove of the first cam wall 32. In the area of the large-diameter surface 33b excluding the area of the small-diameter surface 33b, the clamper 24 is moved to a retracted position on the side of the rotating tray 21 against a spring that biases the clamper support 25 to rotate. The upper portion of the rotating tray 21 above the disk mounting portion is opened so that the disk can be detached.

The first and second elements having the above-described functions are provided.
With the rotation of the cam gear 28, the clamper support 25 firstly moves the clamper 24
Is moved horizontally from the retracted position on the side of the rotating tray 21 to above the center of the disk playback position facing the playback unit of the rotating tray, and then simultaneously lowered in synchronization with the lowering of the rotating tray 21 . At this lowered position, the clamper 24 clamps the disk between the turntable 12 and the turntable 12 that lifts the disk on the rotary tray 21 from the disk mounting surface by a predetermined height t1, and holds the disk on the turntable 12 To be used for information reproduction by the optical head.

Thus, according to the embodiment having the above-described configuration, as shown in the operation diagram of FIG. 13, the rotating tray 21 is rotated by 120.degree. First cam wall of cam gear 28
The lowering and raising of the position of the reproducing unit 23 by the operation of 32 are alternately repeated. And rotating tray 21
When the disc is lowered to the position of the reproducing unit 23, the disc on the disc mounting portion of the rotating tray 21 facing the reproducing unit 23 is used for reproduction by the optical head.

As a result, the rotating tray 21 is arranged at equal angular intervals.
The three discs placed in a state where a part of the discs are superimposed on the rotating tray 21 in accordance with the setting of the playback mode in the state selected by rotating the rotating tray 21 by 120 °.
The clamp 21 is clamped on the turntable 12 by the lowering of the clamper 24 and the information is reproduced by the optical head. Then, after the rotation tray 21 and the clamper 24 are lifted with the release of the reproduction mode, the rotation tray 21 is rotated again by 120 ° to select the next disk and prepare for the setting of the next reproduction mode. By repeating such an operation alternately, the three disks on the rotating tray 21 are successively used for reproduction.

When the rotating tray 21 is rotated by 120 ° and a disc is selected, the clamper 24 is moved to the retracted position beside the rotating tray until the reproduction mode is set. The upper part of the mounting part is open. Therefore, in this state, the disk can be attached to and detached from the disk mounting portion, and the disk can be easily replaced.

[0053] Also in this embodiment apparatus, the rotation of each 120 ° of the carousel 21 in conjunction with the rotation of the cam gear 28 which is rotated by the motor 26, the movement (horizontal movement of vertical movement and the clamper 24 of the carousel 21 And up and down movement) are related to each other and are performed synchronously. Especially for the rotation of the carousel 21, it is assumed that the rotating tray 21 is only performed when it is held in the raised position, vertical movement of the carousel 21 and the clamper 24 is completed 120 ° rotation of the carousel 21, The rotation is performed only when the rotation tray 21 is held at the rotation position.
, So as to be unitarily controlled and driven. Therefore, a stable operation can be reliably performed with a very simple configuration, and the operation reliability can be sufficiently increased.

Further, the three divided areas of the cam gear 21 are effectively used, and the rotary tray 21 is moved up and down in one area, and the clamper 24 is moved up and down in another area. Therefore, these operation timings can be accurately defined with a very simple configuration. Further, since the movement of the clamper 24 is controlled by the first and second cam walls 32, 33 formed integrally with the cam gear 28, the movement of the clamper related to the vertical movement of the rotary tray 21 is also very smooth. can do.

In the above-described embodiment, one cam gear 21 is used to control the vertical movement of the rotary tray 21 and the movement of the clamper 24. However, these may be controlled using separate cam gears. good.

For example, as shown in FIG. 14, another cam gear 51 that rotates in conjunction with the cam gear 28 is provided, and the cam gear 51 is set to rotate three times for one rotation of the cam gear. The cam gear 51 may be configured to move and displace the clamper support 52 that supports the clamper 24.

Specifically, the cam gear 51 is constructed as shown in a schematic external perspective view in FIG.
Hook 53 on the cam surface in the radial direction as shown in FIG.
Is displaced, and the clamper support 52 engaged with the hook 53 is rotated and displaced in the horizontal direction. At the same time, the shaft 52a of the clamper support 52 is moved up and down on the cam surface of the cam gear 51 as shown in FIG.

With such a configuration, one of the rotating trays 21
Each time a rotation of 20 ° is made, the rotation tray 21 and the clamper 24 are moved up and down by one rotation of the cam gear 51, so that substantially the same operation and effect as in the above-described embodiment can be obtained. .

The present invention is not limited to the embodiment described above. In the embodiment, the rotating tray having a structure in which three disks are mounted has been described. However, the same configuration can be realized in a case where two disks are mounted or in a case where four or more disks are mounted. can do. Further, as means for regulating the lowering position of the rotating tray, a projection of a predetermined length is provided on the rotating tray side, and the height for defining the lowering position of the rotating tray by contacting the projection on the chassis side. a plurality of reference surfaces may be'll keep provided Unishi the of different.

[0060]

As described above, according to the disk reproducing apparatus of the present invention, the rotation of the rotary tray, its up and down movement, and the movement of the clamper are operated in synchronism with each other only by controlling the rotation of the cam gear. Since a plurality of discs on the tray can be selectively used for reproduction, the drive control is simple, and the drive mechanism can be easily and reliably constructed.

Further, when the rotary tray is at the raised position, the clamper is moved to the retracted position and the upper part of the disk mounting portion is opened so that the disk can be exchanged. And the handling of the disk can be facilitated.

[Brief description of the drawings]

FIG. 1 is a diagram schematically illustrating a configuration of a rotating tray according to an embodiment of the present invention.

FIG. 2 is a view for explaining a step between bottom surfaces in a concave portion of the disk mounting portion;

FIG. 3 is a diagram showing a state in which a disc is placed on a rotating tray.

FIG. 4 is a partial perspective view schematically showing the structure of a disk retaining projection.

FIG. 5 is a diagram showing a relationship between an upper disk mounting portion and a disk;

FIG. 6 is a perspective view showing another configuration example of the rotating tray.

FIG. 7 is a plan view illustrating a schematic configuration of an apparatus according to an embodiment.

FIG. 8 is a diagram schematically showing a rotation transmission system of the embodiment device.

FIG. 9 is a perspective view showing a schematic configuration of a cam gear.

FIG. 10 is a diagram showing characteristics of a cam gear and a plan configuration thereof.

FIG. 11 is a diagram showing a support structure of a rotating tray.

FIG. 12 is a diagram showing a relationship between a clamper support structure and a cam gear.

FIG. 13 is a diagram showing an operation diagram of the apparatus of the embodiment.

FIG. 14 is a diagram showing another example of the support structure of the clamper.

[Explanation of symbols]

1… Tray body, 1a… Rotary shaft, 2,3,4… Disc loading part,
2a, 3a, 4a: Circular hole, 2b, 3b, 4b: Slot hole, 5, 6, ... Disc retaining protrusion, 7, 8, 9, 11 ... CD (disk), 7a, 8a, 9a: Rotation clamp Division, 12 ... turntable, 14 ... clamper, 21
... Rotating tray, 22 ... Chassis, 23 ... Reproducing unit, 24 ...
Clamper, 25 ... clamper support, 26 ... motor, 28 ... cam gear, 29 ... missing tooth gear, 30 ... gear, 31 ... ratchet mechanism,
32: first cam wall, 33: second cam wall, 41: rotating shaft, 42
... Spring receiver, 43 ... Cam pin, 44 ... Compression spring, 45 ... Protrusion
(Height position regulating member), 46: projection, 25a: rotating shaft, 47: spring support, 48: compression spring, 49: cam pin, 51: cam gear,
52: clamper support, 53: hook member.

Claims (3)

(57) [Claims] To 1. A equiangular intervals around the rotation center axis, a plurality of
Place the disc mounts (2, 3, 4) on the adjacent disc mounts.
Tray (1) provided so that two discs overlap each other, and an optical reading unit and
Between the reproducing unit (23) having a turntable and the turntable.
A clamper (24) for holding the disc and a horizontally movable clamper support for supporting the clamper
(25) and rotating the tray with the motor (26) as a drive source.
The tray and the playback unit relatively vertically.
Contacting and separating, and raising and lowering the clamper support
By horizontally moving the clamper support, the clamper support and
And the clamper of all the disc mounting portions of the tray.
A disk reproducing apparatus comprising: a drive mechanism (28) for retracting from an upper position . 2. The distance between the tray and the reproducing unit is as follows.
The driving mechanism is performed by raising and lowering the tray, and the driving mechanism has a different height depending on the position in the circumferential direction.
The first cam (32) has a different radius depending on the circumferential position.
2 and the disc mounting portion at an equal angular interval with the cam (33).
Gear teeth (29a) with the same number of teeth provided at the same number of places
When the first cam drives the clamper support up and down, the first cam
Then, the tray is driven up and down, a second cam drives the clamper support horizontally, and a plurality of gear teeth rotates the tray intermittently.
2. The disk reproducing apparatus according to claim 1, wherein: 3. The apparatus according to claim 1, wherein the first cam is provided with a plurality of data on the tray.
Equi- angular spacing between multiple lower cam surfaces corresponding to the disk mounting part
With a high cam surface between each low cam surface
The higher cam surface of the clamper support and the tray.
The tray is also used for high-level regulation.
Has height position regulating parts (45a, 45b, 45c) according to the height difference
The restricting portion is brought into contact with the common fixing portion (46) by
In addition, a low position corresponding to each disk mounting portion is defined, and the clamper support supports the clamper and the turntable.
Low level is defined by sandwiching the disc between
Disk reproducing apparatus according to claim 2, characterized in that the the like.