JPS63241757A - Disk clamping mechanism - Google Patents

Abstract

PURPOSE:To surely support a disk selectively with simple structure by providing respectively a turntable corresponding to the disks of different diameters and a disk clamper and by the composition to energize it, to allow and check the contact. CONSTITUTION:A disk 17 or 20 is mounted on the turntable 18 or 21 and the pin 23b or 23c of a clamper supporting plate 23 comes on the horizontal face 30b2 or 30c2 of cam part 30b or 30c with the movement of a cam rack 30 in the arrow mark D direction. At this time, a disk clamper 24 or 25 is brought into contact with the disk 17 or 20 with the energizing of a spring 28, the pin 23c or 23b is slightly floated and the disk 17 or 20nis interposed between the clamper and turntable. The supporting plate 23 is thus moved like a seesaw by the selection of the turntable to surely support the disk 7 with simple structure. Since the distance between the spring 28 and two differs, the force to press the disk can be varied.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a disc playback device that can play multiple types of discs with different diameters, such as video discs and compact discs. , particularly regarding improvements to its disk clamp mechanism. (Prior Art) As is well known, a so-called compatible type disc allows playback by selectively mounting multiple types of discs with different diameters, such as a laser video disc with a diameter of 30 cm and a compact disc with a diameter of 12 cm+. disc playback devices have become popular. In this type of disc playback device, turntables are generally installed in the device to correspond to discs of different diameters, and the discs are placed on the designated turntables. The disc is sandwiched and supported between the turntable and the disc clamper. In this case, a disc clamper is installed on each turntable, and only the disc clamper corresponding to the turntable on which the disc is placed is selectively moved toward the turntable to create a gap between the disc clamper and the turntable. The discs are sandwiched and supported by the discs. However, the above-mentioned compatible disc playback device is still in the development stage.
Regarding the above-mentioned disk clamper, each disk clamper is selectively driven by an independent disk clamp g1 structure, which results in a more complicated and larger configuration, and also makes assembly difficult and economical. Various problems arise, including disadvantages. (Problems to be Solved by the Invention) As described above, in the conventional disc clamp II provided in a compatible type disc playback device, each disc clamper is provided with an independent one. However, there are problems in that the number of parts increases and the configuration becomes complicated, which is economically disadvantageous. Therefore, this invention has been made in consideration of the above circumstances, and is an extremely good and economically advantageous system that has a small number of parts, a simple configuration, and can selectively and reliably support each disk. The purpose of the present invention is to provide a disk clamp ll111. [Structure of the Invention] (Means for Solving the Problems) That is, the disk clamp mechanism according to the present invention has the following features:
First and second disk clampers are rotatably supported above the first and second turntables arranged in parallel at positions corresponding to the first and second turntables, respectively. A clamper support member is installed, and the clamper support member is biased in a direction in which the first and second disk clampers come into contact with the first and second turntables. and a first position regulation that allows and prevents the first and second disc clampers from coming into contact with the first and second turntables by moving the clamper support member in a substantially seesaw shape using a cam mechanism. and a second position regulation that prevents and allows the first and second disc clampers from contacting the first and second turntables. (Function) According to the above configuration, the clamper support members that rotatably support the first and second disk clampers are moved in a substantially seesaw shape, and the first and second disk clampers are selectively operated. Since the disc clamping mechanism is made to contact the first and second turntables, the number of parts is reduced and the configuration is simplified compared to the conventional disc clamping mechanism in which each disc clamper is provided with an independent disc clamping mechanism. Furthermore, each disk can be selectively and reliably supported, which is also economically advantageous. (Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. In FIG. 4, reference numeral 11 denotes a disc playback device, which has a tray 12 that can be moved in and out horizontally, that is, in the directions of arrows A and B in the figure, through a disc loading opening 11b formed in a front panel 11a. are doing. This tray 12 is mounted on a carrier 13, and when a disc loading switch (not shown) is operated while the tray 12 is housed inside the disc playback device 11, for example, the tray 12 is loaded approximately half way as shown in FIG. It is adapted to be automatically projected to the outside of the device 11. When the user manually pulls out the tray 12 in the direction of the arrow in FIG. 4, the tray 12 is separated from the carrier 13 and placed in a full oven state, as shown in FIG. Further, the tray 12 is returned into the apparatus 11 to the position shown in FIG. 4 by being manually pushed in the direction of arrow B by the user in the full oven state shown in FIG. When the tray 12 is roughly pressed in the direction of arrow B, the tray 12 is automatically pulled in the direction of arrow B by the action of the carrier 13 and housed in the apparatus 11. Here, the upper surface of the tray 12 has a diameter of 30 mm, for example.
A circular concave first disc mounting portion 14 on which a cm video disc can be mounted is formed. Further, the tray 12 is provided with a diameter 1 mm, for example, at a position within the first disk mounting portion 14 near the front end surface of the tray 12 in the direction of external protrusion.
A circular concave second disk mounting portion 15 is formed on which a 2CI1 compact disk can be placed. In this case, the second disk mounting section 15 is formed at a position where a straight line connecting its center and the center of the first disk mounting section 14 is oblique with respect to the direction in which the tray 12 enters and exits. has been done. Then, the tray 12 shown in FIG.
The protruding position is such that the second disc mounting portion 15 is completely exposed to the outside, that is, a position where the compact disc can be loaded and unloaded. Further, the full oven position of the tray 12 shown in FIG. 5 is such that the first disk mounting portion 14 is completely exposed to the outside, that is, a position where video disks can be loaded and removed. The tray 12 has a first disk mounting section 1.
A circular notch 12a is formed in the center of the disk 4, and a second disk a holder 15 is connected to the notch 12a.
A linear notch 12b is formed through the center of the disc holder 12 to the peripheral edge of the first disk mounting portion 14. Here, in the disc playback device 11, the sixth
As shown in the figure, a main chassis 16 formed by bending a metal plate into a substantially U-shape is installed. At approximately the center of the bottom surface of the main chassis 16, the tray 12
is completely accommodated in the disc playback device [11],
At a position corresponding to the lower side of the notch 12a, a turntable 18 for placing a video disc (indicated by a two-dot chain line in the figure) 17 and a disc motor 19 for rotationally driving the turntable 18 are provided. is installed. Further, in the main chassis 16, when the tray 12 is completely housed in the disc playback device 11, a compact disc ( A turntable 21 for placing a turntable 20 (indicated by a two-dot chain line in the figure) and a disk motor (not shown) for rotationally driving this turntable 21 are installed. Further, an optical pickup 22 is installed in the main chassis 16 so as to be movable below the notch 12b while the tray 12 is completely housed in the disc playback device 11. Here, a clamper support plate 23 is installed on the main chassis 16 so as to span between its upper ends in the figure. This clamper support plate 23 is provided with the turntable 18.
Disk clampers 24 are placed at positions corresponding to 21, respectively.
．． 25 is rotatably supported. Each disc clamper 24, 25 is selectively pressed against the turntable 18, 21 by the action of a disc clamping mechanism, the details of which will be described later. For this reason, for example, the first disk mounting portion 1 of the tray 12
When the video disc 17 is placed on the tray 12 and the tray 12 is accommodated in the disc playback device 11, the video disc 17
is sandwiched between the turntable 18 and the clamper 24 via the notch 12a, and the disc motor 19
The optical pickup 22 is rotated by the action of the notch 1.
The video disc 17 is then played back via the video disc 2b. In addition, in the playback state of this video disc 17,
Turntable 21 on which compact disc 20 is placed
and its disk motor etc. are optical pickup 22
The turntable 21 is automatically retracted to a position out of the moving path of the turntable 21, and the height of the turntable 21 is lowered so as not to interfere with the playback of the video disc 17. Further, for example, the compact disc 20 is placed 1lEf on the second disc mounting portion 15 of the tray 12, and the tray 12
When the compact disc 20 is housed in the disc playback device 11, the compact disc 20 is inserted into the turntable 21 through the notch 12b.
The optical pickup 22 is sandwiched between the compact disc 20 and the clamper 25, and rotated by the action of the disc motor, so that the optical pickup 22 plays back the compact disc 20 through the notch 12b. Next, details of the disk clamp mechanism will be explained. In FIG. 1, the clamper support plate 23 rotatably supports a disk clamper 24 via a support 26 at approximately the center thereof. In addition, this clamper support plate 2
3 is formed with a support piece 23a projecting from the negative side thereof, and a disk clamper 25 is rotatably supported on this support piece 23a via a support 27. In this case, the support piece 23a is bent slightly upward in the figure from its base end. Here, at both ends of the clamper support plate 23, there are a pair of bins 23b whose outer peripheries are rotatable in a roller shape, respectively.
23c, 23d, and 23e are provided protrudingly, and
Cylindrical hooks 23f and 23g are provided in a protruding manner. Of these, the bins 23b and 23d are provided at positions where a straight line connecting them passes through the center of rotation of the disk clamper 25, and the bins 23c and 23e are provided at positions where a straight line connecting them passes through the center of rotation of the disk clamper 24. It is provided. Further, the hooks 23f and 23T) are installed between the bins 23b and 23c and between the bins 23d and 23c, respectively. And these bins 23b, 2
3c, 23d. 23e and hooks 23f, 23Q are slotted into long holes 1 formed in both side plates 16a, 16b of the main chassis 16.
They are loosely inserted into 6C to 16f, 16g, and 16h, respectively. Therefore, the clamper support plate 23 is movable in the vertical direction in FIG. The clamper support plate 23 also has hooks 23f and 23Q, and hooks 1 cut and raised on both sides of the bottom surface of the main chassis 16.
Coil-shaped springs 28 and 29 are respectively engaged between 6i and 16j, so that they are biased downward in the figure. On the other hand, both side plates 16a of the main chassis 16. A cam rack 30.31 is supported on the cam rack 16b so as to be slidable along the outer wall thereof in the directions of arrows C and D in the figure. These cam racks 30.31 have gears 32.33, which are rotatably supported by the main chassis 16, meshed with gears 30a and 31a formed at the lower end in the figure, respectively. .33 are integrally rotated by the rotational force of a motor (not shown), so that they are integrally moved in the directions of arrows C and [) in the figure. Here, the cam rank 30.31 is formed with first cam portions 30b, 31b that are engaged with the bins 23b, 23b protruding from the clamper support plate 23, respectively, and are engaged with the bins 23c, 23e. Second cam portions 30c and 31c are formed, respectively. Of these, the first cam portions 30b and 31b are connected to the first horizontal surface 30b1, 31b1 and the first horizontal surface 30b.
l. A second horizontal plane 30b2.31b2 lower than 31b1 and a third horizontal plane 30b2.31b2 lower than this second horizontal plane 30b2.31b2.
It has horizontal surfaces 30b3 and 31b3. Further, the second cam portions 30c and 31c are connected to the first horizontal surface 3.
0cl, 31cl, and this first horizontal surface 30cl,
31c2 and a second horizontal surface 30c2 lower than 31c1. In the above configuration, referring to FIG. 2 below,
Let's explain its operation. However, FIG. 2 shows the relationship between the clamper support plate 23 and the cam rack 30, and the relationship between the other clamper support plate 23 and the cam rack 31 is the same, so a description thereof will be omitted. First, when no disk is placed on any of the turntables 18, 21, the cam rack 30 is moved in the direction of arrow C, as shown in FIG. 2(a). For this reason, the bins 23b, 23 of the clamper support plate 23
c is the first of the first and second cam portions 30b and 30c.
are located on horizontal planes 30b1 and 30c1, respectively. Therefore, the clamper support plate 23 is placed at the highest position,
In other words, disk clamper 24.25 is turntable 1.
The location is restricted to the farthest position from 8.21. Next, when the video disc 17 is placed on the turntable 18, a detection means (not shown) detects that the video disc 17 has been loaded, and as shown in FIG. It is moved in the direction of the arrow in the figure. At this time, the movement of the cam rack 30 in the direction indicated by the arrow causes the bin 23b of the clamper support plate 23 to move toward the first cam portion 30b.
It is done until it rides on the second horizontal plane 30b2. At this time, the disk clamper 24 comes into contact with the video disk 17 due to the biasing force of the spring 28 and is lifted by the thickness thereof, so that the clamper support plate 2
The bin 230 of No. 3 is located on the second horizontal surface 3 of the second cam portion 30C.
It starts to rise slightly from 0C2. Therefore, the disc clamper 24 is pressed against the video disc 17 by the biasing force of the spring 28, and the video disc 17 is sandwiched and supported between the disc clamper 24 and the turntable 18. Furthermore, when the pin 23b of the clamper support plate 23 is on the second horizontal surface 30b2 of the first cam portion 30b, the support piece 23a of the clamper support plate 23 is slightly bent upward in the figure. Therefore, the disc clamper 25 is restricted to a position where it does not come into contact with the video disc 17. Furthermore, at this time, as described above, the turntable 21 on which the compact disc 20 is placed is retracted out of the movement path of the optical pickup, and
Since the height is controlled to be low, the video disc 17 can be played back without any problem. Next, place the compact disc 20 on the turntable 21.
When the compact disc 20 is loaded, a detection means (not shown) detects that the compact disc 20 is loaded, and the cam rack 30 is further moved in the direction indicated by the arrow in the figure, as shown in FIG. 2(C). At this time, the cam rack 30 is moved in the direction of the arrow until the bin 23b of the clamper support plate 23 is placed on the third horizontal surface 30b3 of the first cam portion 30b. At this time, the disc clamper 25 is brought into contact with the compact disc 20 by the biasing force of the spring 28 and lifted by the thickness thereof, so that the bin 23b of the clamper support plate 23 is moved to the third horizontal surface 30b3 of the first cam portion 30b. It will start to rise slightly. For this reason,
The disc clamper 25 is pressed against the compact disc 20 by the biasing force of the spring 28, so that the compact disc 20 is sandwiched and supported between the disc clamper 25 and the turntable 21. Moreover, at this time, the bin 23c of the clamper support plate 23 is
Since the disk clamper 24 remains on the second horizontal surface 30c2 of the second cam portion 30c and the support piece 23a of the clamper support plate 23 is slightly bent, the disk clamper 24 is positioned slightly above the turntable 18. regulated. Furthermore, at this time, the compact disc 20 does not reach the turntable 18, so the compact disc 20 can be played back without any problem. That is, in the state shown in FIG. 2(b), the clamper support plate 23 supports the spring 28 with the bin 23b as a fulcrum.
The disc clamper 24 is pressed against the video disc 17 by the urging force of the bin 2 in the state shown in FIG. 2(C).
The disc clamper 25 is moved approximately in a seesaw shape using the fulcrum 3c so that the disc clamper 25 is pressed against the compact disc 20 by the biasing force of the spring 28. Therefore, according to the configuration of the above embodiment, the disk clamper 24 supported by the same clamper support plate 23
．． 25, the first cam portions 30b, 31b and the second cam portion 30C831 formed on the cam rack 30.31.
By the action of c, the clamper support plate 23 is moved in a substantially seesaw shape and is moved in the direction of selectively contacting the turntable 18°21. Compared to a disc clamping mechanism, the number of parts is small, the configuration is simple, and each disc can be selectively and reliably supported, making it economically advantageous. , the distances between the hook 23f, to which the biasing force of the spring 28 is applied, and the bins 23b, 23c are made different, so that the biasing force of one spring 28 reduces the force with which the disc clamper 24.25 presses the disc 17.20. , can be changed, respectively, and has a unique configuration in this respect. In this case, in reality, the video disc 11 has a size of about 1 kq, and the compact disc 20 has a size of about 5 kq.
A pressing force of 00 g is applied. Here, FIG. 3 shows means for supporting the disk clamper 24 on the clamper support plate 23. That is, the bush 3 is attached to the disc clamper 24 from the back side with the disc-shaped clamper holder 34 sandwiched therebetween.
5 is press-fitted. In this case, the disc clamper 24 and bush 35 are rotated integrally with respect to the clamper holder 34. The clamper holder 34 is provided with a plurality of (three in the illustrated case) elastic pieces 34a, 34b, and 34c cut and raised in the shape of tongues along its circumferential side. Moreover, these elastic pieces 34a, 34b, 34
At the tip of C, there is a hemispherical protrusion 34a1.3.
4b1°34C1 is formed. Furthermore, bent pieces 34d and 34e are formed on the peripheral edge of the clamper holder 34 at two positions facing each other with the center thereof in between. On the other hand, the clamper support plate 23 has circular arc-shaped through holes 23h, 23i, through which the elastic pieces 34a, 34b, 34c of the clamper holder 34 can be inserted, respectively.
23j is formed, and each through hole 23h, 2
Small diameter through holes 231, 231 on the circumference indicated by 3i, 23j. 23n is formed. And each elastic piece 34a of the clamper holder 34. 34b and 34c are connected to each through hole 2 of the clamper support plate 23.
3h. 231, 23J, and bent pieces 34d, 34
Hold e and rotate to remove protrusions 34al, 34bl,
The disk clamper 24 is attached by fitting the through holes 231.degree. 23a+, 23n. Therefore, the disk clamper '24 can be easily attached to the clamper support plate 23 with a simple configuration. Furthermore, in FIG. 3, the installation of the disc clamper 24 for clamping the video disc 17 was explained.
Of course, this can also be applied to the attachment of the disc clamper 25 that clamps the compact disc 20. It should be noted that the present invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without departing from the gist thereof. [Effects of the Invention] Therefore, as detailed above, according to the present invention, the number of parts is small, the configuration is simplified, and each disk can be selectively and reliably supported, which is also economically advantageous. It is possible to provide an extremely good disk clamping mechanism.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the disk clamping mechanism according to the present invention, FIG. 2 is a side view for explaining the operation of the same embodiment, and FIG. 3 is a mounting of the disk clamper in the same embodiment. 5 is an exploded perspective view showing the means, FIGS. 4 and 5 are perspective views respectively illustrating loading of a disc playback device to which the present invention is applied, and FIG. 6 is a schematic diagram of the inside of the disc playback device. FIG. 11... Disc playback device, 12... Tray, 13
...Carrier, 14...First disk mounting section, 1
5... Second disk mounting part, 16... Main chassis, 17... Video disc, 18... Turntable, 19... Disc motor, 20... Compact disc, 21...・Turntable, 22...
Optical pickup, 23... Clamper support plate, 24
．． 25...Disk clamper, 26.27...Support, 28.29...Spring, 30.31...Cam rack, 32, 33...Gear, 34...Clamper holder, 35...・Butshu. Figure 3

Claims (1)

[Claims] In a disk clamp mechanism that clamps a disk selectively placed on first and second turntables arranged in parallel, the first and second turntables are installed over the first and second turntables. a clamper support member that rotatably supports first and second disk clampers at positions corresponding to turntables 2 and 3; a biasing means for biasing in a direction to contact the turntable, and the clamper support member are moved in a substantially seesaw shape so that the first and second disk clampers come into contact with the first and second turntables; a first positional restriction that allows and prevents the first and second positional restrictions;
A disc clamping mechanism comprising: a cam mechanism that selectively performs a second position regulation of preventing and permitting the disc clamper from contacting the first and second turntables.