JPH0573781U - Carousel for mounting a disc in a disc player - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the diameter of a rotary tray that holds a plurality of disks at equal angular intervals around a rotary shaft. [Structure] A plurality of disks 7, 8, 9 around the rotary shaft 1a,
The recesses forming the disk mounting portions 2, 3 and 4 have predetermined steps so that they can be mounted in a partially overlapped state while avoiding the rotating clamped portions 7a, 8a and 9a at the center of each disk. The recesses H are formed continuously, and the step H between the inner bottom surfaces of each of the recesses is set as at least the thickness T of the disk plus a predetermined allowance (t1 + t2), and the inner diameter W of each recess is set. Is set by adding a predetermined margin d to the outer diameter D of the disk.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disk mounting rotary tray of a disk reproducing apparatus for mounting a plurality of disks around a rotary shaft at equal angular intervals, and more particularly to a tray structure that can be made compact.

[0002]

[Prior Art]

 Recently, a disc reproducing apparatus that optically reproduces information recorded on a disc recording medium has become widespread. In particular, there is a remarkable widespread use of a disc reproducing apparatus for reproducing music information recorded on a disc recording medium having a diameter of 12 cm or 8 cm, that is, a so-called CD (compact disc). This type of disc player is typically equipped with a type in which one CD is loaded for playback and a magazine (disc cartridge) preloaded with a plurality of CDs. There is a type in which each CD is selected and used for playback.

In recent years, a rotating tray on which three CDs can be placed side by side at equal angular intervals is used. By controlling the rotation of the rotating tray by 120 °, the CDs placed on it can be selectively. A disc reproducing apparatus of the type used for reproduction has also been developed. The disk reproducing apparatus using the rotary tray of this kind has an advantage that its structure is relatively simple. However, on the other hand, the carousel requires a size (diameter) on which three CDs are placed side by side in a plane. Therefore, it cannot be denied that the size of the disk reproducing apparatus, especially the width dimension, becomes large. Moreover, if four or more CDs are to be accommodated, the diameter of the carousel will be dramatically increased each time the number of accommodated CDs is increased, and it will no longer be practical.

[0004]

[Problems to be solved by the device]

 As described above, in the conventional disc reproducing apparatus using the rotary tray, there is a problem that the width dimension of the disc reproducing apparatus becomes large according to the diameter of the rotary tray, which causes a problem in downsizing. there were.

The present invention has been made in consideration of such circumstances, and an object thereof is to mount a disc having a highly practical structure that enables the width dimension of the disc reproducing device to be kept small. To provide a carousel.

[0006]

[Means for Solving the Problems]

 The disk mounting rotary tray of the disk reproducing apparatus according to the present invention has a plurality of disk mounting portions for mounting a plurality of disks at equal angular intervals around a rotation axis, and particularly, a plurality of disk mounting sections. The recesses that form the disk mounting parts are continuously formed with a certain level difference so that the disks can be mounted in a partially overlapped state while avoiding the rotating clamped part at the center of each disk. Then, the step between the inner bottom surfaces of each of these recesses is set as a dimension of at least the thickness of the disc plus a certain allowance, and the inner diameter of each recess is determined as the outer diameter of the disc plus the allowance. It is characterized by

Further, in the case of mounting three discs, in particular, the inner diameter is provided at a portion of the inner peripheral surface of the recess of the upper disc mounting portion that is in contact with the inner peripheral surface of the recess of another disc mounting portion. It is characterized by the provision of a disc retaining protrusion that protrudes inward by the extra margin of the disc.

[0008]

[Action]

 According to the disk mounting rotary tray having such a structure, the recesses having the predetermined inner diameters forming the respective disk mounting portions are arranged in a predetermined relationship in such a manner that they are overlapped with each other while avoiding the rotating sandwiched portion at the center of each disk. Since the discs are formed continuously with a step difference, each disc does not have to be covered with other discs at the center of the disc to be rotated, and a predetermined gap is created between the discs. They are formed and mounted on the disk mounting portions. As a result, it becomes possible to independently clamp the rotating clamped portions of the respective discs and rotate them for reproduction.

Further, in the case of mounting three discs, since the disc removal preventing protrusion is provided in the disc mounting portion in the upper stage, the discs mounted there will slide unintentionally. Therefore, it will not fall down to another disk mounting part.

[0010]

【Example】

 Hereinafter, a disk mounting rotary tray of a disk reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

The disc loading rotary tray is rotatably incorporated into the disc reproducing apparatus main body at a predetermined angle, and a plurality of discs (here, compact discs; CDs) mounted around the rotation axis are The recording unit is selectively opposed to a reproduction unit including a turntable mechanism and an optical head mechanism and used for reproducing the recorded information.

FIG. 1A shows a plan configuration of a disk mounting rotary tray according to this embodiment, and FIG. 1B shows a cross section of a portion indicated by a chain line A in FIG. 1A. The structure is shown schematically.

The disk mounting rotary tray shown in this embodiment is designed to mount three CDs having a diameter of 12 cm, and is located in the lower surface of the disk-shaped tray body 1 made of a synthetic resin material. The core has a rotating shaft 1a. Then, on the upper surface of the tray body 1, three disk mounting portions 2, 3 and 4 for mounting three CDs, respectively, are used as recesses to form an equiangular interval (120 in this example) around the rotary shaft 1a. (Intervals) are formed.

Each of the disk mounting portions 2, 3, and 4 is a circular recess having an inner diameter W, and the height of the inner bottom surface thereof is made different in order. In particular, the disk mounting portions 2, 3, 4 are arranged so that the storage areas partially overlap each other while avoiding the circular holes 2a, 3a, 4a for inserting the turntables formed at the center positions of the mounting areas. Then, each circular concave portion is continuously formed with a step.

With respect to the inner diameter W of each circular recess, the outer dimension of the CD is defined as D, and the allowable center deviation of the disc clamp by the turntable (the allowable positional deviation of the CD relative to the turntable that can reliably clamp the CD). When the capacity d is considered to be a margin for mounting the disc, it is set as (D + d).

Further, as shown in FIG. 2, the step H between the inner bottom surfaces of the circular recesses is such that the thickness of the CD 11 is T and the turntable 12 through which the circular holes 2a, 3a, 4a are inserted is the disk mounting portion. The height dimension for lifting CD11 on 2,3,4 is t1, in order to keep the non-contact relationship with another CD13 which is placed on the upper disc loading part at this time. When the gap size is t2, these allowances are taken into account and determined as (T + t1 + t2). Therefore, the three disc mounting portions 2, 3, 4 form circular recesses deeper than the disc mounting portion 2 located at the upper stage by a step H (= T + t1 + t2) to form the middle-stage disc mounting portion 3. Further, a circular concave portion is formed deeper than the disc mounting portion 3 by a step H (= T + t1 + t2) to form the lower disc mounting portion 4. At this time, the depth of the circular concave portion forming the upper disc mounting portion 2 may be set to the step height H, but since the CD is not provided above it, basically the disc mounting portion 2 is not provided. As the depth of the circular recessed portion, it is sufficient to have the above-mentioned CD lifting height dimension t1.

In FIG. 2, reference numeral 14 is a clamper for sandwiching the CD 11 with the turntable 12.

In this way, while forming the step and avoiding the circular holes 2a, 3a, 4a, the storage areas are partially overlapped with each other to form the circular concave portion continuously, so that the circular concave portion is formed around the rotary shaft 1a. According to the carousel with three disk mounting parts 2, 3, 4 equiangularly spaced, the CDs are sequentially loaded from the lower disk mounting part 4 to the middle and upper disk mounting parts 3, 2. As they are placed, as shown in FIG. 3, these three CDs 7,8,9 have the respective clamped portions 7a, 8a, 9a for rotation at the center of the disc of each CD 7,8,9. They will be stored on the rotating tray in a partially overlapped state, avoiding them.

However, if the rotary tray is rotated by 120 ° about the rotary shaft 1a, one of the disc mounting portions 2, 3 and 4 is sequentially moved to the position of the reproducing unit and is placed there. The inserted CDs 7, 8 and 9 are alternatively arranged opposite to the reproducing unit. In this state, for example, if the reproducing unit is raised to the rotary tray side by a predetermined height, the CDs 7, 8 and 9 mounted on the disc mounting portions 2, 3 and 4 at the positions facing the reproducing unit will be removed. The turntable which is inserted from the lower side of the rotary tray through the circular holes 2a, 3a, and 4a is lifted by the height t1 described above. The CDs 7, 8 and 9 are sandwiched between a clamper (not shown) located above them and a turntable, and are rotationally driven to be used for information reproduction by the optical head.

It should be noted that the disc reproducing apparatus may be configured such that the reproducing tray is lowered to the reproducing unit side by a predetermined height instead of raising the reproducing unit to the rotating tray side by a predetermined height. Needless to say.

Here, by the relative movement of the rotary tray and the turntable 12 in the height direction, the turntable 12 is inserted into the circular holes 2a, 3a, 4a to enter the upper surface side of the rotary tray. It goes without saying that the amount of movement is determined according to the disc mounting portions 2, 3, 4 facing the reproducing unit. Specifically, in comparison with the case where the lower disk mounting portion 4 faces the reproducing unit, when the middle disk mounting portion 3 faces the turntable, the turntable is extra by the step H. If the upper disk mounting portion 2 is moved, the turntable is further moved by the amount of the step H, that is, 2H. As a result, the CDs 7, 8 and 9 placed on the disc mounting portions 2, 3 and 4, respectively, are lifted from the inner bottom surface of the recess by the height t1 to be used for reproduction.

The circular holes 2a, 3a, 4a described above are provided as holes having a diameter through which the above-mentioned turntable can be inserted, corresponding to the rotating clamped portions 7a, 8a, 9a of the CDs 7, 8, 9 respectively. Of course, what is said is. Further, the optical head passes through the groove holes 2b, 3b, 4b formed from the circular holes 2a, 3a, 4a of the disk mounting portions 2, 3, 4 toward the outer peripheral side of the tray, and the disk mounting portions 2, 3, 3, respectively. It is exposed to the CDs 7, 8 and 9 placed on the 4. The shape of these slots 2b, 3b, 4b and the formation positions on the disk mounting parts 2, 3, 4 depend on the specifications such as the shape and structure of the optical head mechanism in the playback unit and the mounting position of the playback unit on the rotary tray. It goes without saying that it will be determined accordingly.

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

The amount of protrusion of the end portion of the disc retaining protrusion 5 is determined, for example, as the above-mentioned marginal dimension d degree that is defined by the inner diameter W of the circular recess forming the disc mounting portion 2 in relation to the disc diameter D. Has been. The height h of the end portion of the disc retaining protrusion 5 from the bottom surface inside the recess is set slightly lower than this height because the lifting height of the CDs 7, 8 and 9 by the turntable is t1 as described above. To be done.

However, the disk slip-out preventing projections 5 prevent the CD 7 from slipping laterally from the disk mounting portion 2. That is, as shown in FIG. 5, the inner peripheral surface of the concave portion of the disc mounting portion 2 is adjacent to the rotary tray on which the three discs are partially overlapped and mounted as described above. It is largely shaved by the other disk mounting portions 3 and 4 formed by the above. 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 above-mentioned inner diameter allowance d and the overlapping amount of the mounting areas. In this case, there is a risk that the CD 7 on the disc mounting portion 2 will slide laterally through this opening and slip off to the other disc mounting portions 3 and 4.

However, even in such a case, according to the above-described disk slip-out preventing protrusion 5, the opening width can be narrowed by the amount of the inward projection, and can be made smaller than the disk diameter D. It becomes possible to effectively prevent the CD 7 from slipping off. Moreover, since the height of the disc retaining protrusion 5 is kept lower than the lifting height t1 of the CD7 by the turntable, the disc retaining protrusion 5 becomes an obstacle when the CD7 is clamped on the turntable and rotated. There is nothing.

By the way, the above-mentioned embodiment is premised on mounting only a CD having a diameter of 12 cm, but it is also possible to mount a CD having a diameter of 8 cm. In this case, as shown in FIG. 6, circular concave portions 2c, 3c, 4c for 8 cm diameter CD may be formed coaxially on the inner bottom surfaces of the respective disk mounting portions 2, 3, 4 respectively. .. The depth of these circular recesses 2c, 3c, 4c from the inner bottom surface of the recesses of the respective disk mounting portions 2, 3, 4 may be such that it is as shallow as possible to restrict the displacement of a CD having a diameter of 8 cm. .. When the depth of the circular recesses 2c, 3c, 4c is t3, the step H between the disk mounting portions 2, 3, 4 described above may be set as (T + t1 + t2 + t3).

In this case, the same disk disengagement projection 5 as the disk disengagement projection 5 described above is also formed on the inner peripheral surface of the circular recess 2c adjacent to the inner peripheral surface of the other disk mounting portions 3 and 4. It goes without saying that 6 should be formed.

The present invention is not limited to the above embodiment. In the embodiment, the rotary tray having a structure for mounting three discs has been described, but the same applies to the case where two discs are mounted or when four or more discs are mounted. Can be realized. Further, instead of integrally forming the disc retaining protrusion on the tray main body made of synthetic resin, it is possible to incorporate a separate member. In addition, the shape and dimensions of each part may be determined according to the specifications, and various modifications can be made without departing from the spirit of the invention.

[0030]

[Effects] As described above, according to the disk mounting rotary tray of the present invention, a plurality of disks are partially overlapped with each other while avoiding the rotary clamped portion at the center of the disk. Since the rotating trays are mounted at equal angular intervals, the entire diameter of the rotary tray can be reduced. As a result, it is possible to reduce the width of the disc reproducing device to a compact size. Further, since the disc mounting portion is formed with a predetermined step, it is possible to selectively reproduce the discs with the discs partially overlapped.

Further, in the case of mounting three discs, the disc is prevented from coming off at a portion of the inner peripheral surface of the concave portion of the upper disc mounting portion which is in contact with the inner peripheral surface of the concave portion of another disc mounting portion. Since the protrusions are provided, the disc mounted on the disc mounting portion in the upper stage does not fall laterally, and the effects such as stable placement and holding can be obtained.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a planar configuration and a partial sectional configuration of a carousel according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining a step between the bottom surfaces in the recess of the disk mounting portion.

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

FIG. 4 is a partial perspective view schematically showing the structure of a disc removal prevention protrusion.

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

FIG. 6 is a perspective view showing another embodiment of the present invention.

[Explanation of symbols]

1 ... Tray body, 1a ... Rotary shaft, 2,3,4 ... Disk mounting part, 2a, 3a, 4a ... Circular hole, 2b, 3b, 4b ... Groove hole, 5,6 ... Disk retaining protrusion, 7, 8,9,11… CD (disc), 7a, 8
a, 9a… Clamping part for rotation, 12… Turntable, 14… Clamper.

Claims (2)

[Scope of utility model registration request] 1. A plurality of disc mounting portions for mounting a plurality of discs at equal angular intervals around a rotation axis, and the disc mounting portions are selectively moved to a disc reproducing position by rotation. In the disc mounting rotary tray of the disc reproducing apparatus, each disc mounting portion is a tray for placing a plurality of discs in a partially overlapped state while avoiding the rotating sandwiched portion at the center of each disc. The main body is composed of concave portions continuously formed with a predetermined step, and the step between the inner bottom surfaces of the concave portions forming the disc mounting portions is set as at least the thickness of the disc plus a margin, and the concave portions are formed. An inner diameter of the disk is set as an outer diameter of the disk plus a margin, respectively. 2. The disk mounting rotary tray of the disk reproducing apparatus according to claim 1, wherein the disk mounting portion comprises three recesses of an upper stage, a middle stage and a lower stage, and an inner periphery of the recess of the upper stage disk mounting unit. A disc reproducing device characterized in that a disc slip-out preventing protrusion protruding inwardly within a margin of the inner diameter is provided at a portion of the surface which is in contact with the inner peripheral surface of the recess of another disc mounting portion. The carousel for disk loading.