JP2533734B2 - Disk mounting mechanism - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc recording / reproducing apparatus, and more particularly to an auto loading type disc reproducing apparatus capable of reproducing discs having different diameters. The present invention relates to a suitable disc mounting mechanism. An example of a conventional auto-loading type disc reproducing apparatus capable of reproducing discs having different diameters will be described with reference to the drawings. FIG. 1 is a perspective view showing an example of a conventional device, and FIG. 2 is a cross-sectional view of FIG. 1 taken along the line AA '. Next, the configuration of the conventional device 1 will be described. The conventional device 1 is composed of a main body 2 and a disc loading unit (hereinafter referred to as an auto loading unit) 3. The autoloading unit 3 rotates the disc 6, the turntable 4, the spindle 5 fitted into the center hole 7 of the disc 6, and the autoloading unit 3 in parallel with each other in the B-Ba direction. The rack gear 10 is in mesh with each other. Further, the main body 2 meshes with the rack gear 10 and rotates in the C-Ca direction so that the gear motor 11 and the auto-loading portion 3 for moving the auto loading part 3 in the B-Ba direction in parallel are provided in the main body 2. After being stored in the
It is composed of a pickup 9 which reproduces a rotating signal. Next, the operation of the conventional device will be described. Disk 6
When the signal is reproduced from, the gear motor 11 is rotated in the Ca-C direction and the rack gear is moved in parallel in the Ba-B direction to convey the autoloading unit 3 to the outside of the main body. After the auto-loading section 3 is carried out of the main body, and after the auto-loading section 3 is carried out of the main body, the disk 6 is visually checked by the user and sensed by hand.
The very small center hole 7 of the and the spindle 5 on the turntable are fitted together. After the fitting is completed, the gear motor is rotated in the Ca-C direction opposite to the previous one, and the auto loading unit 3 is housed in the main body. The clamper 8 presses the disc 6 against the turntable 4, and the turntable is rotated to rotate the disc 6, and the pickup 9 reproduces the signal recorded on the disc 6. In the above-mentioned conventional apparatus, when reproducing discs having different diameters, the disc 6 is brought out to the front of the turntable 6 and the center hole 7 which is very small with respect to the diameter of the disc 6 is visually observed by the user. It is necessary to fit the spindle 5 and the disk 6 to the turntable 4, and in most cases, the disk 6 is made of an impermeable material. There was some inconvenience. When the pickup 9 is arranged below the turntable 4 and the signal recording surface 12 of the disk 6 is mounted downward, the disk recording surface and the spindle 5 come into contact with each other and the signal recording surface 12 is scratched. There was a possibility to attach it. In addition, since the turntable 4 rotates, it has a built-in rotation mechanism and is heavy.
Since the turntable 4 is conveyed to the front, the gear motor 11
Was forced to use a powerful motor, and the rack gear 10 and the auto-loading unit 3 also needed to withstand the weight of the turntable 4. Next, a second conventional device which compensates for the drawbacks of the conventional device will be described with reference to the drawings. FIG. 3 is a perspective view of a positioning mechanism for mounting disks having different diameters in the second conventional device. FIG. 4 is an explanatory diagram showing the force received by the disc from the positioning mechanism of FIG. The configuration of the second conventional device will be described below.
A transfer device for transferring the inserted disc 6 to the turntable 4 is provided inside the insertion opening 13 of the disc 2 provided on the front surface of the conventional device 8. The transfer device is a drive roller 1
4, 14a, 14b and the drive roller 14a in the center thereof
The caster roller 16 includes a caster roller 16 arranged in a face-to-face relationship with the rotary shaft of the caster roller 16.
Since it is in a twisted position, it can be easily turned in either direction. The turntable 4 is in the lowered position when the disc 6 is not recorded and reproduced, and is raised only when the disc 6 is recorded and reproduced. Auxiliary rollers are provided on both sides (not shown) of the turntable 4 and cooperate with the transfer device to keep the disk 6 horizontal when the turntable 4 is in the lowered position. Two guide posts 15 and 15a are arranged at a position opposite to the transfer device of the turntable 4 at the same distance from the spindle 5 at the center of the turntable 4,
The distance is changed according to the size of the diameter of the disk 6 inserted from the insertion opening 1. Next, the operation of the second conventional example will be described. The disk 6 inserted from the insertion opening 13 of the disk 6 is sandwiched between the drive rollers 14, 14a, 14b and the caster roller 16 and transferred, and when it reaches the turntable 4 in the lowered position. , Disk 6
Edge of the guide post 15 (or 15 ') abuts,
Upon receiving the component force Fb shown in the figure, it is rotated in the direction of Fb. At this time, since the caster roller 16 easily faces the direction of Fb, the disk 6 rotates around the guide post 15 and contacts the guide post 15 to position the disk 6 on the turntable 4. Then, the spindle 5 together with the turntable 4 also rises, and the spindle 5 fits into the center hole 7 of the disk 6, and although not shown, a clamper equivalent to the first conventional device mounts the disk 6. Press down, guide posts 15 and 15a move away from disc 6, and turntable 4
Although not shown, a pickup equivalent to the pickup 9 of the first conventional device reproduces a signal from the disc 6 while rotating. In the above-mentioned second conventional apparatus, the disk 6 can be mounted on the turntable 4 even if the disk 6 is mounted without strictly considering the relationship between the center hole 7 of the disk and the spindle 5. The disk 6 is a drive roller 14, 14 ',
Since the disk 6 rotates between the 14 "and the caster roller 16 and rotates around the guide post 15, the signal recording surface of the disk 6 is easily scratched. Since it is necessary to change the distance exactly equal to that of the spindle 5, the mechanism for moving the guide post 15 may be more complicated than the disk reproducing mechanism. The summary is as follows: (1) When the disc 6 is mounted on the turntable 4, the disc 6 is likely to be scratched. (2) When the disc mounting mechanism is simplified,
It takes time to mount the disk 6, and if the disk 6 is simply mounted, the disk mounting mechanism becomes complicated and the manufacturing cost is high. The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, to prevent scratches on the signal recording surface of discs having different diameters, and to shorten the carrying distance of the auto loading section. It is an object of the present invention to provide a disk mounting mechanism having a simple structure that can quickly mount a disk. In order to achieve the above object, according to the present invention, a disc as a recording medium mounted on a disc mounting portion of an auto loading portion is carried into the apparatus main body or the apparatus. In the disc mounting mechanism that is carried out of the main body, the disc mounting portion has a plurality of step portions having different outer diameters corresponding to a plurality of discs having different disc outer diameters, and the plurality of step portions have a large diameter. The second disk is mounted
And a first step formed in the second step and having a small-diameter disc mounted thereon, the first step comprising:
The center position of the disc is eccentric with respect to the second step portion in the carrying-out direction, and the outer periphery of the disc is formed in contact with the outer periphery of the second step portion, and corresponds to the outer diameter dimension of the mounted disc. The apparatus is configured to be selectively moved to the outside of the apparatus body to the above position. According to the above-mentioned structure of the present invention, the first step portion on which the small diameter disc is mounted is the second step portion on which the large diameter disc is mounted.
Since it is located inside the step portion, the center position of the disc is eccentric with respect to the second step portion in the ejecting direction of the disc, and its outer circumference is in contact with the outer circumference of the second step portion,
When the small-diameter disc is mounted on the first step, as shown in FIG. 5 described later, the outer diameter of the second step becomes the maximum dimension of the disc loading part of the auto loading part. Of these, only the outer diameter of the first step may be exposed to the outside of the main body. That is, according to the configuration of the present invention, it is possible to minimize the transport distance of the auto loading unit when mounting the small-diameter disc. EXAMPLES The present invention will be described below with reference to examples. FIGS. 5 and 6 are perspective views showing an embodiment of the present invention in which the steps 19 and 20 are arranged with their centers displaced from each other.
In the auto loading unit 3 for placing the disc,
FIG. 5 shows a structure in which a step 19 on which a disc with a small diameter is placed is arranged in the carrying direction of the autoloading unit 3 and a center of each step is shifted compared to a step 20 on which a disc with a large diameter is placed. Shows. By thus shifting the centers of the respective stages of the auto-loading unit 3, when the disc 6 having a small diameter is mounted on the auto-loading unit 3 as shown in FIG. When a disc 6a having a diameter larger than that of the disc 6 is mounted on the disc, as shown in FIG.
The auto-loading unit 3 is carried out in the carrying-out direction of the apparatus by the length of. As described above, the present invention is to shift the center position of the step on which the disk of the automatic loading section 3 is placed. Therefore, with such a configuration, in the case of a disc having a small diameter, the carrying distance of the autoloading section 3 is shorter than that in the case of a disc having a large diameter.
The disc can be mounted in a short time, improving usability. According to the present invention, when a small-diameter disk is mounted, it is exposed to the outside of the main body by the outer diameter of the stepped part of the auto loading section on which the small-diameter disk is mounted. Therefore, it is possible to minimize the carrying distance of the auto-loading unit when mounting a small-diameter disc. Therefore, it becomes possible to quickly mount the disc.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a first conventional device. FIG. 2 is a cross-sectional view taken along the line AA ′ of FIG. FIG. 3 is a perspective view of a second conventional device. FIG. 4 is an explanatory diagram of FIG. 3. FIG. 5 is a perspective view of an embodiment of the present invention. FIG. 6 is a perspective view of an embodiment of the present invention. [Explanation of Codes] 1 ... Playback device for playing back discs with different diameters, 2 ... Main body, 3 ... Auto loading section, 4 ... Turntable,
5 ... Spindle, 6 ... Small diameter disc, 6a ... Large diameter disc, 19 ... Stage for placing disc 6, 20 ... Stage for placing disc 6a, 21 ... Guide hole.

Claims (1)

(57) [Claims] 1. In a disk loading mechanism for loading or unloading a disk as a recording medium loaded in the disk loading section of the disk loading section into or out of the apparatus main body, the disk loading section has a plurality of different disk outer diameters. A plurality of stepped portions having different outer diameters corresponding to the discs, and the plurality of stepped portions are formed in the second stepped portion on which the large-diameter disc is mounted, and the small-diameter portion. The disc includes a first step portion, and the first step portion has a center position of the disc which is eccentric in the carry-out direction with respect to the second step portion, and an outer periphery of the second step portion. A disc mounting mechanism, characterized in that the disc mounting mechanism is formed so as to be in contact with the outer circumference of the portion and is selectively moved in the outer direction of the apparatus main body to a position corresponding to the outer diameter dimension of the mounted disc.