JPS61236059A - Disk clamping device - Google Patents

Abstract

PURPOSE:To eliminate the necessity to provide the separate rotating driving system and the turn table for respective disks by fitting a centering member to engage to the inner diameter of the disk of one side size to a turn table part and fitting the centering member to engage to the inner diameter of other side disk to a pressuring means. CONSTITUTION:A turn table link 21, which is a part of the disk tray, and a turn table 19 are linked, a new turn table part is formed, and centering members 31 and 34 to match with respective disks are fitted with a turn table part and a pressuring means. Thus, for the disk with a different inner diameter, it is not necessary to provide an exclusive-use rotating driving system and an exclusive-use turn table.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a disc clamping device in a recording and reproducing apparatus for video discs, compact discs, and the like.

2. Description of the Related Art In recent years, so-called compatible players have been developed and put on the market that are capable of recording and reproducing various discs with a single device. For example, these devices record and play back video discs and audio compact discs using the same device. One of the problems in this case is that the sizes of the respective disks are different. For example, the inner diameter of an optical video disc is approximately φ35ml5. The outer diameter is approximately φ300111&, the inner diameter of the compact disc is approximately φ16, and the outer diameter is approximately φ12.
It is 0 cranes. In particular, the diameter of the turntable on which a large video disc is mounted and clamped overlaps the signal recording area of a compact disc, making it impossible to share the diameter. Therefore, in order to clamp and center each disk at an optimal position, a mechanism suitable for each disk size is required.

Hereinafter, the above-mentioned clamping device for disks of different sizes will be explained with reference to the drawings.

FIG. 6 is a diagram schematically showing a conventional device. Here, 1
2 is an opening provided in the device main body 1, and 3 is a disk tray. The disc tray 3 is projected from the opening 2 by a means not shown, and when a desired disc 4 is placed thereon, it is housed again in the main body of the apparatus. Once it is above the rotational drive system 6, the disk tray 3 is moved downward by means, also not shown, and the disk 4 is placed on the turntable 6&. After that, the clamp member 1o located above moves downward, and the disc 4 is placed on the turntable 6! Press onto L to clamp. Thereafter, the disk is rotated to a desired rotational speed by the rotary drive system 6, and a signal recording and reproducing pickup (not shown) records and reproduces signals from the underside of the disk 4.

On the other hand, when discs 5 of different sizes are placed on the disc tray 3, the type of the disc is identified by means not shown. Then, in response to the identified signal, the rotary drive unit rotates in the direction of arrow 9 about rotation axis 8 . A rotary drive system 7 corresponding to the disk 6 is arranged below the disk 6.

It is equipped with a turntable 7a adapted to the inner diameter of the disc 5 and the clamping area.

Problems to be Solved by the Invention However, the above-mentioned configuration requires separate rotational drive systems, which requires a large amount of space within the device body and increases costs.

In view of the above-mentioned problems, the present invention provides a disk clamping device that can reduce the size of the device body and is inexpensive.

Means for Solving the Problems In order to solve the above problems, the disc clamping device of the present invention has a turntable section on which discs with different inner diameters are placed, and a vertically slidable member that engages with the inner diameter of one of the discs. A tapered centering member is attached with a spring biased upward, and engages with the inner diameter of the other disk and slides up and down on the disk pressing means that presses the inner diameter of the above-mentioned fii disk from above. The present invention is characterized in that the tapered centering member is mounted with a downward spring bias.

Operation The present invention has the above-mentioned configuration. For each disc, especially for discs with different inner diameters, a part of the disc tray is used to form a turntable part that matches the disc size each time, and one rotary drive unit is used. Since the main body can produce two types of turntable sizes, there is no need to have separate rotation drive units for each, and discs of different sizes can be reliably clamped and centered.

EXAMPLE Hereinafter, a disk clamp device according to an example of the present invention will be described with reference to the drawings.

1 and 2 show a disc clamping device according to an embodiment of the present invention, 11 is a recording and reproducing machine, 12 is an opening provided in the recording and reproducing machine 11, 13 is a disc tray support frame, and 14 is a disc A tray, 15 is a moving means for moving the disk tray support frame into and out from the opening 12 of the main body of the apparatus, 16 is a moving means for moving the disk tray 14 up and down, 17 is a mounted i&disk, and 18 is a rotation drive system. , 19 is a turntable with a rotary drive system, and 2o is located above the turntable 19 and is a disk pressing means that can move up and down.

FIG. 3 shows a view from above when the disk tray has advanced in the direction of arrow 39 and is stored in the device, and 2
17 & indicated by a dashed dotted line indicates the position where a video disc and a 17Jj compact disc are placed, respectively. Of course, these are not placed at the same time. 1
9 is a turntable with the same rotational drive system as in FIG. 2, a turntable link that is part of the 21-piece tray 14, and 25i
lt) A circular opening provided with v-141tC,
The turntable link 21 is fixed and supported. Reference numeral 22 denotes a pickup for recording and reproducing signals, which is capable of scanning in the disk radial direction by moving means f''L as shown in the figure.23
24 is an objective lens, and 24 is a slit provided in the tray 14, which is wider than the pickup 22 so as not to come into contact with the pickup 22 when the disk tray 14 moves downward. In addition, the slit 24 is a circular opening 2
5 are connected. Reference numeral 26 denotes a step provided on the tray 14, on which the video disc 17& is placed while being guided. Further, 27 is a step for guiding the compact disc 17b.

FIG. 4 is a sectional view of the tray 14, and the reference numerals are the same as in FIG. 3.

In FIG. 6, reference numeral 29 is a tapered center boss provided at the center of the turntable 19, and is urged upward by a spring 33. Further, 28 is a recess provided in the pressing means 2o, and is tapered so as to fit into the center boss 29. Reference numeral 3o denotes a bush loft that presses the pressing means 2o downward, and can be moved up and down by a moving means (not shown). 36 is a locking member fixed to the pressing means 20, and the locking member 36
When the holder moves upward, the pressing means 20 is pulled and lifted upward. Reference numeral 31 denotes a tapered centering member attached to the pressing means 2o, and is urged downward by a spring 32. Further, 34 is a tapered centering member f' attached to the turntable 19, and is biased upward by a spring 35. Reference numerals common to other drawings indicate the same elements.

The operation of the disk clamping device constructed as described above will be described below with reference to FIGS. 1 to 5.

In FIG. 2, the disc tray support frame 13 is connected to the opening 12.
When it protrudes further, the operator can place the disc 17 on the disc tray 14. Thereafter, the disc tray support frame 13 is housed in the apparatus, and at this time, the type of disc, that is, the size, is identified by an identifying means (not shown). This can be accomplished using known techniques by providing the disc tray 14 with some kind of optical detection means. Referring to FIG. 3, the following operations will be explained in detail. When it is determined that a compact disc 17b with a small inner diameter is placed on the disc tray 14, the disc tray support frame 13 moves until the center of the disc 17b comes to the center of the turntable 19 and stops. do. FIG. 3 shows this state. Thereafter, the disk tray 14 is moved downward by the disk tray moving means 16 shown in FIG. When the disk 17b descends to the surface of the turntable 19, only the disk 17b remains on the turntable 19, and the disk tray 14 continues to descend further, breaking contact with the disk 17b.At this time, the inner diameter of the disk 17b is brought into contact with the centering member. It engages with a part of the taper of 34. (FIG. 5) The centering member 34 is urged upward by a spring 35, and functions to eliminate eccentricity even if the disc 1 is placed on the turntable 19 in an eccentric state. After that, the disk pressing means 20
is lowered, and a part of the taper of the recess 28 and the center boss 29 fit together. Since the center boss 29 is also urged upward by the spring 33, the pressing means 2o also fits into the center boss 29 without eccentricity. The bushing rod 30 is lowered to 1, and the pressing portion 37 of the pressing means 20 presses the disk 17b against the surface of the turntable 19, whereby the disk 17bid is clamped. Now in FIG. 3 - video disc 1 of large size, in this case large inner diameter.
When the video disc 72L is placed on the disc tray 14, the disc tray support frame 13 moves further inward by a distance than in the above case, and the center of the video disc 171L comes to the center position of the turntable 19 and stops. Thereafter, the disc tray 14 descends in the same manner as described above, but at this time, the turntable link 21 engages with the turntable portion 19 and separates from the disc tray 14, as shown in FIG. The inner periphery of the turntable link 21 engages with the outer periphery of the turntable portion in a tapered shape. When the disc tray 14 further descends, the disc 17a is placed on the turntable link 21 and stops. Thereafter, the pressing means 2o descends, and the pressing part 38 presses and clamps the disk 171L, but before that, a tapered centering member 31 attached to the pressing means 2o and biased downward by a spring.
engages the inner diameter of the disc 17&, making the disc 17& non-eccentric. Disk 17& is disk 17b
Since it is also thick, the pressing portion 38 is not in contact with the disk 17b in FIG. 5.

As described above, according to this embodiment, the turntable link 21 and the turntable 19, which are part of the disc tray,
are combined to form a new turntable part, and by attaching a centering member suitable for each disc to the turntable part and the pressing means, a dedicated rotation drive system and a dedicated turntable can be used for discs with different inner diameters. It is not necessary to provide each of them.

The structures of the pressing member 20, turntable section 19, etc. described above are not limited to the embodiments.

Furthermore, in the embodiment described above, an auxiliary turntable called the turntable link 21 is provided when discs with different inner diameters are used, but when it is possible to share the turntable section, it is not necessary to provide an auxiliary turntable as in the embodiment. do not have. ! However, the disc is not limited to a video disc or a compact disc.

As described above, the disk clamp device according to the present invention has the following advantages:
When clamping discs with different inner diameters, a centering member that engages with the inner diameter of the disc of one size is attached to the turntable, and a centering member that engages with the inner diameter of the other disc is attached to the -te pressing means. Therefore, there is no need to provide separate rotation drive systems and turntables for each disk. Therefore, since the device only needs to be provided with one rotational drive system, it is possible to have a compact design that does not take up much space, and the manufacturing cost does not increase. Further, there is no need for a mechanism for rotating each rotary drive system, and there is no trouble. Furthermore, since the rotating shaft is fixed, mechanical positional accuracy is maintained with respect to the disk and signal pickup.

[Brief explanation of the drawing]

Fig. 1 shows a disc clamping device according to an embodiment of the present invention, and is a sectional view showing a state in which a disc with a particularly large inner diameter is clamped, and Fig. 2 is a schematic diagram of a recording/reproducing machine having the same clamping device. , Fig. 3 is an enlarged plan view of the disk tray of the same device seen from above, Fig. 4 is a sectional view of the disk tray of the same device, and Fig. 6 is a disk with a small inner diameter being clamped by the same disk clamp device. A sectional view showing the state, and FIG. 6 is a front view showing a conventional disk clamp device. 13... Disc tray support frame, 14...
...Disc tray, 171L...Video disc, 17h...Compact disc, 18.
Old...Rotary drive system, 19...Turntable,
20... Disc pressing means, 21...
Turntable link, 31... Centering member, 32... Spring, 34... Centering member, 35... Spring. Name of agent: Patent attorney Toshio Nakao and 1 other person14
---Te〉Sftray 1'/(L---Video Tisfu zo---Pf) f:, flat cloth 21-1-Guntefulsonk 19-m-turntable 38-11 years old pressure part pivot nm-Recording/reproducing machine 26--Taisugu, W floating means

Claims (1)

[Claims] A tapered centering member that is vertically slidable and engages with the inner diameter of one of the disks is attached to the turntable section on which two types of disks with different inner diameters are placed, and the inner diameter of the disk placed on the turntable section is attached. A disk clamping device characterized in that a tapered centering member that engages with the inner diameter of the other disk and is slidable up and down is attached to the pressing means that presses the vicinity from above.