JPS5940380A - Disk clamp mechanism - Google Patents

Abstract

PURPOSE:To improve the operatbility of a disk clamp mechanism with a simple constitution, by using a holder part which is supported at the front of a cabinet in a free opening/closing way to clamp a disk as well as a disk holder which is set at the holder side in an open state and projected in a closed state. CONSTITUTION:When a disk 45 is put into a holder part and a cover 23 is closed, a reflective photosensor 28 delivers a disk presence detecting signal DSET to a control circuit 49. The circuit 49 delivers a laser ON/OFF control signal LDC to a laser APC circuit 50, and a pickup 25 is energized by the circuit 50 to emit the laser. When the cover 23 is closed before the disk 45 is loaded, the signal DSET sent from the sensor 28 is not supplied to the circuit 49. Therefore no laser is emitted from the pickup 25. When the cover 23 is opened after the disk 45 is loaded, the signal DLK sent from a switch 471 is not supplied to the circuit 49. Thus no laser is emitted from the pickup 25.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an optical disc record playback device suitable for an optical DAD (digital audio disc) system, and particularly to an improvement of its disc clamp mechanism.

[Technical background of the invention and its problems]

Recently, in the field of audio equipment, digital recording and playback methods using PCM (pulse coat modulation) technology are being developed to achieve as high fidelity as possible, and the audio characteristics are becoming more and more popular. This is because it has been established in principle that it is far superior to conventional analog systems, regardless of the characteristics of the recording medium.

In this case, a system that uses a disk as a recording medium is called a DAD system, and optical, electrostatic, and mechanical playback methods have been proposed. Regardless of which regeneration method is adopted, the regeneration equipment that embodies it must be capable of satisfying various sophisticated functions and performances that are not found in US-based equipment. Ru.

For example, among optical playback systems, the one proposed as a CD (compact disc) system has a diameter of 12 mm.
crn, CLV optical disc with thickness 1.2+m++
(constant linear velocity) method approx. 200 to 500 r, p
The disc has a track pitch of 1.6 μm, and a huge amount of information is recorded on one side, allowing for approximately one hour of stereo playback. This is easily understandable.

The above disc is a transparent resin disc and a digital (PC) disc.
M) Bits corresponding to conversion data (irregularities with different reflectances)
It is made by depositing a metal thin film that forms a

[Purpose of the invention]

The present invention has been made in view of the above points, and an object of the present invention is to provide a disk clamping mechanism which has a simple structure and is highly operable.

[Summary of the invention]

That is, the present invention provides a first
a holder, and a second holder that is rotatable to the first holder and is opposed to the front surface of the 7"4 disk, and a part of the holder that is supported on the front surface of the cabinet so as to be openable and closable. , provided to be able to move in and out between the first and second,
located on the second holder side in an open state, and in a closed state.

The present invention is characterized in that it includes a disc holder that is protruded from the second holder in a state in which the disc is clamped, and a disc clamp portion that clamps the disc with the disc holder that is protruded from the second holder.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings, in which the present invention is applied to a CD type optical disc record reproducing apparatus. That is, FIG. 1 shows an external perspective view of an optical disc record playback device using the CD system, and shows a DAD (hereinafter referred to as a disc) loading mechanism section 1 provided on the front panel of a cabinet IO.
1 is a so-called kangaru-pocket type disc that rotates in the direction of arrow (4) in the figure when the eject key 12 is operated, and a disk (not shown) is inserted vertically into the pocket. This is carried into and loaded into the drive position for vertical playback, and the details will be described later.

Note that (POWER) 13 in FIG. 1 is a power key that is operated prior to operating the eject key 12. Hereinafter, on the upper right side of the loading mechanism section 11, there is a display section 14 and a so-called pack word. A first operation section 15 is provided with a reverse key (REV) for operation, a fast forward key (FF) for forward operation, and a play key (PLAY) for play operation. Also in the middle row are the next play key (NEXPLAY) and repeat key (REPEAT).
, pause key (PAUSE) and stop key (S
A second operating section 16 is provided with a second operating section (TOP). Also on the bottom row are the numeric keys 0, 1, 2...9, the memory read key (M-READ), and the memory +
- (MEMORY) and clear key (CLEA)
A third operating section 17 is arranged.

That is, FIGS. 2 and 3 show the states before and after disk loading, respectively. First, in FIG. 2, reference numeral 18 denotes a substantially plate-shaped sub-chassis. This sub-chassis 18 is arranged in parallel with a substantially box-shaped main chassis 19 at a predetermined interval, and extends at both ends of the main chassis 190. Depart 20.
21. The lower portions of both ends of the front holder 22 are rotatably supported by the sub-chassis 18, and the front holder 24 has a lid 23 attached to its front part and is always supported by a torsion spring (not shown). It is biased in the direction of the arrow @). Further, a rear holder 24 having a substantially U-shaped side surface is provided between the sub-chassis 18 and the front holder 22, and the lower portions of both ends of the rear holder 24 are rotatably supported by the front holder 22. 0 above, the front and rear holders 22.24
The front holder 22 is coated with a resin such as polyurethane resin to protect the disk, details of which will be described later, and a pair of arm portions, which will be described later, are formed at the lower end of the front holder 22 to regulate the position of the disk. There is.

Here, the opening 18 formed in the sub-chassis 18
An optical pip-up 25 for signal reading supported by a mounting device, which will be described later, is protrudingly provided in the upper part. This pip-up 25 is attached to the main chassis 19 with an arrow (C).
), (D) directions, and is slidably driven through the opening 181 of the sub-chassis 18 by a pickup drive mechanism, which will be described later.

A switch 26 for detecting the big-up position is provided approximately at the upper end of the rear surface of the sub-chassis 18. In the state (base position &), the pip-up 26 is turned on by a switch drive device, which will be described later, and is supported at the upper end of the pip-up 26.Also, a disk holder 27 is provided approximately at the center of the sub-chassis 18. It is rotatably supported.

The disk receiver 27 is connected to a rotating shaft of a motor (not shown) supported on the back surface of the sub-chassis 18, and is driven to rotate in a predetermined state. A reflective photosensor 28 is provided to detect the presence or absence of a disc. and,
This rotation of the disk receiver 27 is caused by the rotation of the sub-chassis 18.
The disc holder provided in the disc holder is configured to be detected by a reflective photosensor 29 for rotation detection.

Further, one end of the sub-chassis 18 is provided with an eject mechanism (2), which will be described later.This eject mechanism (L) is activated by a loading control mechanism (described later) when the eject operation lever 31 is operated, for example, in the power ON state. Slide the lock slider 33 in the direction of arrow (E) through L to unlock the front holder 22, and also directly operate the lock slider 33 in the power OFF state to unlock the front holder 22. It is something to do. When the lock is released in this way, the front and rear holders 22 and 24 are attached to the sub-chassis 1.
8. A tongue and arm mechanism 34 (
(see Fig. 3) to open the opening state.

That is, in FIG. 3, 35 is the front holder 22.
A fan-shaped gear 35 is formed at the other end of the fan-shaped gear 35. The fan-shaped gear 35 is loaded onto the damper 437 via the reduction gears 36 supported by the extensions 21, respectively, and reaches the closed state. It is opened by being gir-loaded by the biasing force of the torsion spring and the torsion spring. On the other hand, the rear boulder 24 has a guide shaft 4 implanted in the extending portion 21 with respect to a guide groove 4o having a shape shown in FIG. By being inserted, a predetermined loading is performed in conjunction with the loading of the front boulder 22. And the front and rear holders 22.24
In the closed state, the front holder 22 and the rear holder 24
A disk 45 inserted between the two is pressed against the disk receiver 27 in a closed state by a disk clamp mechanism 46 supported by the front holder 22, and is rotated together.

Here, the above-mentioned optical disc record playback device automatically plays the disc 45 (see FIG. 3) when the lid 23 is closed.
is rotated and placed in a playback standby state, for example. That is, FIG. 4 shows the configuration of a safety device for radar, and at the lower end of the extending portion 20 at one end, two circuit-independent switches 47 for radar are installed to rotate the contact portion in the orientation direction. It is set up towards. The movable contact 470 of this switch 47 is opposed to the other end of a drive member 48 having a cross-shaped upper surface, one end of which is supported by the front holder 22 . Therefore, the switch 47 is turned on when the movable contact 470 is pressed by one end of the drive member 48 when the lid 23 is closed, and when the lid 23 is opened, it is rotated with the dose 23 and turned OFF. It is made to be done. Note that the switch 47 has a first switch 471 connected to a control circuit (not shown) as appropriate, and a second switch 47
2 is connected to a laser power source (not shown).

Here, the electrical circuit of the safety device for the radar will be described. That is, in FIG. 5, 471 is the first switch for detecting opening/closing of the lid, and this first switch 471 is connected to the input terminal of the control circuit 49. This control circuit 49 has another input terminal connected to the output end of the reflective photosensor 28 for detecting the presence or absence of the disc, and
The input end of the laser APC circuit 5o is connected to its output end. This laser APC circuit 50 has a second switch 472 connected to the laser power supply 51 at the other input terminal.
is connected, and its output end is connected to the pickup 25.

That is, as mentioned above, the disk 45 (
When the disc 23 is inserted and the lid 23 is closed, the reflective photosensor 28 receives a disc presence/absence detection signal (hereinafter referred to as DSET) and closes the lid 23.
A signal) is output to the control circuit 49. At this time, the first
The switch 471 outputs a lid opening/closing detection signal (hereinafter DL).
K signal) is output to the control circuit 49. Therefore, the control circuit 49 outputs a radar ON-OFF control signal (hereinafter referred to as LDC signal) to the laser APC circuit 50, and the pickup 25 is energized by the laser APC circuit 50 to which this LDC signal is input. A laser (LASEAR) is emitted. For example, if the disk 45 (see Figure 3) is not installed and the lid 2
3 is closed, the DSET signal from the reflective photosensor 28 is not input to the control circuit 49.
No laser is emitted from the pickup '25. In addition, when the lid 23 is opened with the disk 45 (see FIG. 3) inserted, the first switch 4
Since the DLK signal from No. 7 is not input to the control circuit 49, no radar is emitted from the pickup 25.

Furthermore, if the disk 45 (see FIG. 3) is not inserted into a part of the holder and the lid 23 is closed, for example, the reflective photosensor 28 will not output the DSET signal, causing the radar to be emitted from the pickup 25. is something that cannot be done.

In this way, a double safety structure is provided in which the radar is emitted from the pickup 25 only when the disk 45 is attached and the lid 23 is closed. Therefore, even if, for example, the control circuit 49 or the like fails, the switch 47 and the laser power supply 5, which are linked to the opening and closing of the lid 23, are turned off, thereby reliably preventing erroneous laser firing.

Next, the loading control mechanism 2 in the operating state of the optical disc record reproducing apparatus will be described.

That is, as shown in FIG. 4, the extending portion 20 provided with the radar switch 47 has first and second mounting portions 201 and 2θ2 formed at the upper and lower ends thereof, respectively, protruding outward. has been done. The first mounting part 2
01, the first solenoid plunger 52 is connected to the iron core part 52.
0 toward the lid 23. One end of the first drive member 53 is supported by this iron core portion 520 . The first drive member 53 is attached to the first mounting portion 201 near the iron core portion 520 at an intermediate portion thereof by an arrow (b).
, (■) directions, and the other end of the eject shaft 54 supports the eject lever 31 rotatably in the arrow (J) and (6) directions.
b) It is supported so that it can move freely in the direction.

Here, the eject shaft 54 is formed to protrude from the eject lever 31, and a torsion spring 55 is provided at the tip thereof to bias the eject lever 31 in the arrow (b) direction and the arrow (6) direction. It is attached in such a way that

Further, the eject lever 31 has a protrusion 310 on the front surface thereof, and an arrow (6) at one end of the sub-chassis 18.
It is formed to engage with a protrusion 330 of the lock slider 33 that is slidably supported in the direction (F).

Here, the eject lever 3 is formed with a protrusion 3 for driving a switch.
1 is operated, an eject switch 56 provided on the extension portion 20 is driven.

On the other hand, a second solenoid plunger 57 is attached to the second attachment portion 202 of the extension portion 20 with the iron core portion 5σO facing toward the lid 23, and a second solenoid plunger 57 is attached to the iron core portion 5ho of the iron core portion 5ho. One end of the drive member 58 is supported. This second drive section 5
7 is the intermediate portion of the extending portion 2 near the iron core portion 570.
A protrusion 331 formed at the lower end of the lock slider 33 is supported so as to be rotatable in the directions of arrows (J) and k at the lock slider 33.
is holding.

Here, the lock slider 33 has a hook-shaped lock portion 332 formed in the middle thereof corresponding to the protrusion 220 at one end of the front holder 22 . When the lid 23 is closed, the locking part 332 locks the protruding part 220 of the front holder 23 and locks the dose 23 in the closed state. The operation of the loading control mechanism L will be explained. That is, when the lid 23 is closed, the protrusion 2 of the front holder 22 is closed as described above.
20 is locked by the lock portion 332 of the lock slider 33 and is in a locked state. Therefore, as shown in FIG. 4, for example, when the power is turned off, when the eject lever 31 is pressed, the eject lever
31 presses the protrusion 330 of the lock slider 33 engaged with the protrusion 310 against the spring force of the torsion spring 55, thereby causing the lock slider 33 to slide in the direction of the arrow. At this time, the lid 23 is loaded and opened as described above by releasing the locking of the protruding part 220 of the front holder 22 by the lock part 332 of the lock slider 33.

On the other hand, when the power is turned on as shown in Figure 6,
When the first plunger solenoid 51 is driven, the first drive member 53 is rotated in the direction of arrow (I) and moves the eject lever 31 in the direction of arrow (L). lock slider 33
The protrusion 330 is in a non-coupled state. In this state, when the eject lever 31 is operated to suppress the eject lever 31, the protrusion 310 of the eject lever 31 does not press the protrusion 330 of the lock slider 33, and the protrusion 31 for driving the switch does not press the protrusion 310 of the lock slider 33. Turn on the eject switch 5.
The eject signal No. 6 (hereinafter referred to as EJECT signal) is input to a control circuit (not shown). Then, this control circuit generates a position detection signal (hereinafter referred to as SL signal) in which the Villa Fudge 25 is returned to the base point and the switch 26 for detecting the pickup position is turned on, and the disc holder is a reflective type for detecting rotation. When a stop detection signal (hereinafter referred to as DTAC (hereinafter referred to as i)) of the disk receiver 27 is input to the photosensor 29, an eject completion detection signal (hereinafter referred to as EJE) is input.
CT signal) is output and the second solenoid plunger 57 is energized for a predetermined period of time, and the second solenoid plunger 57tNltj)J is activated. Therefore, the iron core portion 570 of the second solenoid planter 57 rotates the driving member 58 of the silk 2 in the direction of arrow (J), and presses the lock slider 33 in the direction of arrow (E). Therefore, the lid 23 is loaded and opened when the front holder 22 is unlocked in substantially the same manner.

Here, the electrical circuit of the loading control mechanism 32 will be described. In FIG. It is said to be driven according to the importance of the turtle.

In addition, the eject switch 66 and the radar switch 47
, the pickup position detection switch 26 and the reflective photosensor 29 are each connected to each input terminal of the control circuit 49, and the output terminal of this control circuit 49 is connected to the second solenoid granger 57 via a solenoid drive circuit 61. has been done.

That is, when the lid 23 is in the closed state and the power is turned off, the power detection signal from the power detection circuit 6o is not output, so the first solenoid plunger 52 is not driven and the eject lever 31 is activated as described above. The pressing operation causes the lid 23 to open.

On the other hand, when the power is turned on, a stain source detection signal is outputted by the power supply detection circuit 6°, and the first solenoid granger 52 is driven. When the eject lever 31 is depressed, an EJECT signal from the eject switch 56 is input to the control circuit 49. Therefore, when the pickup 25 is not at the base position, the control circuit 49 returns the pickup 25 to the base position and outputs the SL signal of the pickup position detection switch 26 and the disc receiver 27.
When the motor is rotating, a brake (not shown) is applied and a DTAC signal from the reflective photosensor 29 is input, and when a DLK signal from the laser switch 47 is input, an EJECT signal is output. The solenoid drive circuit 6 to which the EJECT signal is input drives the second solenoid sylanger 57 to open the lid 23 as described above.

In this way, when the power is off only by suppressing the eject lever 31, the lid 23 is mechanically ejected, and when the power is on, the necessary ejection is performed via the control circuit 49, etc. After the process is completed, remove the lid 2.
3 ejection is performed, and its handling is very simple.

Next, a description will be given of the disk clamp mechanism 46 that presses the disk 45 against the disk receiver 27 with the lid 23 closed (see FIGS. 2 and 3). Figure 9 (a), (
b) and FIGS. 10(, ), (b) are respectively disk 4
5 inserted into a part of the holder, part of the holder is marked with an arrow (A).
) shows a state in which the disc 45 has begun to rotate in the direction of 1, and a state in which the disc 45 has been completely loaded into the disc receiver 27.

Here, in FIGS. 8(a) and 8(b), reference numeral 22 denotes the front holder, and a through hole 221 is formed approximately in the center of the front holder 22. As shown in FIGS. Further, a clamp regulating member 62 is supported on the front surface of the front holder 22 by a rotation shaft 620 so as to be freely rotatable in the direction of the arrow (2) and (0). This clamp regulating member 62 is biased in the direction of the arrow by a spring 63, and a substantially plate-shaped spring member 64 is attached to the front surface of the clamp regulating member 62.
The middle portion of the screw 65 is supported by a screw 65. This spring member 64 has one end connected to the through hole 222 of the front holder 22.
A bottomed cylindrical clamp part 66 is rotatably supported at one end of the clamp part 66 .

This clamp portion 66 has a collar portion 660 formed at its tip to lock the vicinity of the hole of the disk 45, and is fitted into a protruding fitting portion 270 formed approximately at the center of the disk receiver 27. It is something that will be done. In addition, the spring member 6
A pair of pressing portions 640 and 641 are formed substantially parallel to each other at the other end of 4. One of the pressing portions 640 is opposed to the arm portion 240 formed on the rear holder 24, and the other suppressing portion 641 is opposite to the arm portion 240 formed on the rear holder 24.
It is opposed to an arm portion 180 formed at 8.

Here, the operation of the disk clamp mechanism L1 configured as described above will be described. First, Figure 8 (,), (b
) When the disk 45 as shown in FIG. Therefore, the clamp portion 66 is rotated most in the direction of arrow (6) by the biasing force of the spring 63, and the clamp portion 66 does not protrude into the through hole 221 of the front holder 22. This removal disk 45 has its peripheral edge supported by a disk position regulating device L2 described later, and one side of the disk 45 is supported by the front holder 22.

Next, as shown in FIGS. 9(a) and 9(b), when the front holder 22 is pressed in the direction of the arrow (A), the front holder 22 is moved so that the above-mentioned bump/mother mechanism 34 is reversed. It is rotated in the direction of arrow (A). At this time, the rear holder 24 is
Since the guide shaft 41 is inserted into the guide groove 40 of the guide portion 39, it is rotated in the direction of the arrow while sliding in the direction of the disk receiver 27. Here, the front holder 22 and the rear holder 24 are regulated by a regulating member (not shown) so that the distance between them is in a predetermined state. on the other hand,
As the front and rear holders 22, 24 are rotated, the arm portion 240 of the rear holder 24 comes into contact with one of the suppressing portions 640 of the spring member 64 and presses the clamp regulating member 62. 0) direction. Therefore, the clamp portion 60 of the spring member 64 begins to protrude from the through hole 221 of the front holder 22.

When the front holder 22 is further rotated in the direction of the arrow (A), the front holder 22 is rotated by the lock portion 332 of the lock slider 33 as shown in FIGS. is locked in the closed position. At this time, the spring member 64 has the other suppressing portion 641
8, the clamp part 66 protrudes from the through hole 221 of the front holder 22, and is combined with the coupling part 270 of the disc receiver 27 via the disc 45, and here, This completes the installation of the disk 45.

Here, one of the suppressing parts 640 of the spring member 66 is used to protect the disk 45 by its spring force when the clamp part 66 presses the disk 45 too much, so that the disk 45 is not required to be protected. In this case, the force of its repulsion is such that it has no idea of its shadow.

In addition, when taking out the disk 45, as described above, by operating the eject lever 31 (see FIG. 4), the disk cranometer mechanism 46 performs an operation opposite to the above-mentioned loading operation, so that the disk 45 can be taken out easily. Therefore, its explanation will be omitted here.

In this way, the clamp portion 66 against which the disk 45 is pressed
can be stored inside the front holder 22. Therefore, when attaching or detaching the disk 45, the clamp portion 6
6 does not get in the way, and the disk 45 can be attached and detached very easily. Here, a disk position regulating device [that regulates the position of the disk 45 when loading the disk 45 into the disk receiver 27] is installed. Let's talk about it. That is, FIG. 11 and FIG. 12 respectively show a state in which the disk 45 is partially inserted into the holder and a state in which the disk 45 is completely loaded into the disk receiver 27. Here, in Figure 11, 4
Reference numeral 5 designates the disk, and the peripheral edge of the disk 45 is supported by a disk position regulating member 68 provided at the lower end of the front holder 22. This disk position regulating member 68 is formed in a substantially U-shape, and arm portions 69 and 70 for supporting the peripheral edge of the disk 45 are formed at both ends thereof. At the upper ends of these arm portions 69 and 70, approximately U-shaped I holding portions 690 are provided at intermediate portions.
, 700 are formed, and these holding parts 690, 70 are formed.
The disk 45 is loaded in a substantially vertical position while being in contact with the disk 45. Further, the disk position regulating member 68 is provided with a rotating shaft 71 whose both ends are fixed to the intermediate portion of the arm portion 69, 70, and this rotating shaft 7) is rotated to the lower end of the front holder 22. Supported for free movement.

Here, the disk position regulating member 68 has a torsion spring (not shown) engaged with the rotating shaft 7 so as to apply a spring force in the direction of the arrow (J3), so that the lower end of the bottom thereof is in the front surface of the above-mentioned front surface. Locking part 2 formed on holder 22
22. For this reason, the disk position regulating member 68 is in a co-rotating state with the front holder 22.

Further, the sub-chassis 18 is provided with an adjusting member 72, for example, a screw, for adjusting the stroke, corresponding to the bottom of the disk position regulating member 68. The stroke of the disk position regulating member 68 is adjusted.

That is, when the disk 45 is inserted between the front holder 22 and the rear boulder 24 when the lid 23 is open as described above, the disk 45 is pushed by its own weight to the arm portion 69 of the disk position regulating member 68, as shown in FIG. .70
Supported by At this time, the disk 45 is tilted by the holding portions 690, 700 of the disk position regulating member 68, and its surface is brought into contact with the front boulder 22. Here, the front holder 22 is moved in the direction of arrow (4). When the disk 45 is rotated to the position shown in FIG. 27 and the fitting portion 270 thereof. When the front holder 22 is further pressed, the front holder 22 is locked by the lock mechanism as described above, and the disc 45 is pressed against the disc receiver 27 by the disc clamp mechanism 46 described above. be. At this time, the disk position regulating member 68 has its bottom connected to the adjusting member 72 of the sub-chassis 18.
is engaged with. For this reason, the disc position regulating member 6
The arm portions 69 and 8 are separated from the peripheral edge of the disk 450 by the torsion spring of the rotating shaft 71.

Further, when the above-mentioned iso-extreper 31 (see FIG. 4) is operated in order to take out the loaded disk 45, the above-mentioned disk position regulating device operates in a manner substantially opposite to the loading operation. 1 The explanation of its operation will be omitted here. In this way, the disc 45 is pressed against the disc receiver 27 by the disc clamp mechanism L1 from the state where the lid 23 is opened by the disc position regulating member 68. The system was designed to regulate everything up to and including For this reason, the disk 45 does not make any clicking noises or thuds due to changes in the angle of inclination, and its maintenance can be ensured.

Here, the retention means formed on the front and rear holders 22, 24 for the inserted disk 45 will be described. (See Fig. 2) That is, in Fig. 13, 73 is a member made of, for example, synthetic resin, which forms the front and rear holders 22 and 24, and the surface portion of this member 73 has appropriate elasticity. For example 20-60
A 7'c2 liquid type polyurethane resin paint 75 is applied, mainly consisting of, for example, urethane beads 74 which are foamed into a spherical shape of μ.

Therefore, when the disk 45 (see FIG. 3) is attached or removed between the front holder 22 and the rear holder 24, for example, when the disk 45 comes into contact with the front and rear holders 22, 24, the polyurethane 414 and the oil paint 75 The urethane beads 74 are crushed by the disk 45.

Therefore, it goes without saying that the elasticity of the polyurethane resin paint 75 increases depending on the thickness of the urethane bead 74 layer, and the thickness of the tail and tail can be adjusted as necessary. It is a good idea to adjust the

Next, referring to the disk drive and playback mechanism section, FIG. 14 shows the disk drive and playback mechanism section constructed between the main chassis 19 and the sub-chassis 18.

That is, in FIG. 14, reference numeral 25 denotes the pickup, and the pickup 25 is supported by a pickup mounting member 77 of an optical big-ag mounting device (details of which will be described later) with a lens portion 250 corresponding to the disc holder 27. It is arranged in an opening 181 of the sub-chassis 18 . The pickup 25 has a pair of guide portions 78 , which are arranged vertically and vertically on the main chassis 19 on the back side of the pickup 25 via the pickup mounting member 77 .
Arrows CP) and (Q
) is supported so as to be slidable in the direction.

Furthermore, a switch driving device, the details of which will be described later, is provided at the upper end of the pickup mounting member 77. This switch driving device has a driving part 81 facing the operating part 261 of the switch 26 for detecting the pickup position, and is located at the sliding base position of the pickup 25 (the inner peripheral part of the disc to be loaded). 0Here, the lower end of the sub-chassis 18 is provided with a pickup holding device (to be described later).
(not shown) is provided, and by means of this pickup holding device, the pickup 25 is fixed to the subchassis 18, for example, when the DAD playback device is being transported.

Here, the pickup mounting device L1 that adjusts the angle of the pickup 25 will be described as shown in FIGS. 15 and 16 (a), (b), (c), (d).
) show the entire pickup mounting device 76, the negative side, the front, the top, and the bottom, respectively.

Also, FIGS. 17 and 18 show the pickup 2 in FIG. 15.
5 shows the focus offset adjustment unit and base axis of No. 5.

That is, in FIG. 15, reference numeral 25 denotes a pickup having a substantially rectangular parallelepiped shape, and this pickup 25 has a lens portion 250 formed at the lower front surface thereof, and a printing arrangement for controlling the pickup 25 on the lower side thereof. A mounting plate 82 is provided.

A substantially U-shaped second mounting member 84 is provided on one side of the pickup 25 via a substantially plate-shaped first mounting member 83 so as to surround the lower and upper surfaces of the pickup 25. These first and second mounting members 83.
84 is screwed onto the lower part of one side of the pickup 25 by a fixing screw 85. The second mounting member 8
4 has an elongated hole 840 formed at a position corresponding to the upper part of one side of the pickup 25, and this elongated hole 840 has a first
A hexagon socket screw 86 is inserted through a washer 89 and screwed into the first mounting member 83 and the picker 7a25.

Further, the first and second mounting portions 83 and 84 have through holes 8 corresponding to the printed wiring board 82 of the pickup 025.
30,841 are formed, and the through holes 830,8
A focus set adjustment section (2) shown in FIG. 17 is formed near the bottom of 41. In this focus set adjustment section LL, an eccentric cam 89 for adjustment is inserted into a through hole 842 formed in the second mounting member 84 through a wave washer 90, and this eccentric cam 89 is inserted into a through hole 842 formed in the second mounting member 84. It is screwed onto the first mounting member 83 and the pickup 25 by a screw 92 with a screw 92.

Here, in the vicinity of the first hexagonal socket screw 86 at the upper end portions of the first and second mounting members 83° 84, there are provided arrows (R) and (S) directions (track groove direction) of the pickup 25. A first adjustment section 93 for adjustment is formed, and this first adjustment section 93 is formed for adjustment.
By operating the adjustment section 93, the pickup 25 is rotated together with the first mounting member 83 about the first bushing 91 as a rotation axis, and adjustment is performed.

Further, the pickup mounting member 77, which is substantially U-shaped, is provided on the rear surface of the big center 7°25. Both ends of the pickup mounting member 77 are respectively placed on both ends of the second mounting member 840, and the both ends of the pickup mounting member 77 are placed on the first
As shown in FIG. 8, the screw 95 is inserted through the second bushing 94.
is screwed onto the second mounting member 84.

Furthermore, a long hole 7 is provided at the upper end of the pickup mounting member 77.
A second hexagon socket screw 96 is inserted into the elongated hole 770 in which 70 is formed through a washer 97, and is screwed onto the second mounting member 84.

Furthermore, adjustment of the pickup 25 in the arrow (G) and (T) directions (radial tracking direction) is provided near the second hexagon socket screw 96 at the upper end of the pickup mounting member 77 and the second mounting member 84. The second adjustment section 9
Here, the operation of the pickup mounting device L configured as described above will be described. That is, pickup 2
5 focus offset knob, arrow (3), (Y)
To adjust the direction, first loosen the first hexagon socket screw 86 and the fixing screw 85.

And focus offset adjustment part L! When the screw 92 is rotated with a screwdriver (not shown), the eccentric cam 89 is rotated, and the pickup 25 is moved together with the first mounting member 83 in the direction of the arrow (G) or (B). Focus offset is adjusted.

Further, when adjusting the arrow (R) and (S) directions (track groove direction) of the pickup 25, the first hexagon socket screw 86 and the fixing screw 85 are loosened in substantially the same way as the 1st focus offset adjustment. When, for example, a screwdriver is inserted into the first adjustment part 93 and pressed in a predetermined direction, the pickup 25 rotates in the direction of the arrow (R) or (S) around the first bushing 92 together with the first mounting member 83. The track groove direction is adjusted by moving the track groove.

Further, when adjusting the pickup 25 in the direction of the arrows (T) and (radial tracking direction), the second hexagon socket screw 96 is loosened. Then, the second A adjustment section 9
For example, when a screwdriver is inserted into 8 and pressed in a predetermined direction, the pickup 25 is attached to the first and second mounting members 83 and 84.
At the same time, the second bushing 94 is rotated in the direction of the arrow (B) or (G) to perform adjustment in the radial tracking direction.

Here, the first hexagonal socket screw 86 and the fixing screw 85 or the second hexagonal socket screw 96, which have been loosened in order to perform each of the above adjustments, are each tightened after each adjustment is completed. It is designed to lock in position.

Note that the above-mentioned adjustment of the focus offset of the pickup 25 and adjustment of the track groove direction are performed by loosening the first hexagon socket screw 86 and the fixing screw 85, respectively. First, set the 3x offset. By setting the track groove direction after that, the once set focus offset position can be changed by the overwhelming action of the wave washer 9o provided between the eccentric cam 89 and the second mounting member 84.

In this way, the pickup mounting device L! With this configuration, the pickup 25 can easily and reliably adjust its focus offset, track groove direction, and radial tracking direction.

Next, the pickup feeding mechanism 79 will be described.
FIG. 19 shows the big-a-no-transfer mechanism 79 shown in FIG. 14 taken out.

Moreover, FIG. 20 shows the damper device of FIG. 19 taken out.

That is, in FIG. 19, 99 is the sub-chassis 1.
8 (see FIG. 14), and a first pulley 10θ is fitted onto the shaft of the feed motor 99. One side of a substantially loop-shaped belt 101 is stretched over this first pulley 100, and this pertonation. 1
The other end is wound around the second pulley IQ2.

A shaft 103 is fitted to the center of rotation of the second pulley 1o2, and a worm 104 is attached to the shaft 103 by the screw 10.
5. It is fixed. The shaft 104 is supported by a substantially U-shaped bearing 106 so as to sandwich the worm 104f, and the bearing 105 is supported by the sub-chassis 18 (see FIG. 14).

Further, the worm 104 is meshed with a worm gear 107, and the worm gear 107 is connected to the sub-chassis 1.
8 (see Fig. 14), and a third no.
09 is integrally formed. This third pulley 1o
9, one part of a substantially loop-shaped wire wire 12 having a pickup mount 110 and a spring 111 in the middle is wound 1.5 times, and this wire 11
2 is wound around the fourth pulley. The rotation center shaft 114 of this fourth pulley 113 has one end supported by a bearing 115 supported by the sub-chassis 18 (see FIG. 14).
is supported by an E-ring 116, and the other end is supported by a damper device 17 shown in FIG. 19.

Here, as shown in FIG. 20, this damper device 112 has a blade member 120 of the illustrated shape of a rotary blade 119 enclosed in a case 118 together with grease 12. A fitting portion 122 that protrudes into a substantially ring shape is formed in the holder. This rotary blade 119 has the fourth pulley 11 at its center.
The rotation center shaft 114 of the fourth pulley 113 is fitted, and its fitting portion 122 is fitted to the other surface of the fourth pulley 113.

Further, the case 118 has a spring-locking protrusion 123 formed at one end thereof, and a rotation-preventing protrusion 5124 formed at the other end.
, 124 are a spring 125 whose one end is locked to the sub-chassis 18 (see FIG.
(See FIG. 14) are respectively locked to locking portions (not shown) formed in the bottom. Therefore, the case 118 is stopped at the illustrated position with respect to the rotation of the fourth boolean IJ IJ 3.

Incidentally, the pickup 25 shown by the dotted chain line in FIG. 14, which is attached to the pickup attachment member 77 as described above, is fixed to the pickup mount 110.

Here, the operation of the pickup feeding mechanism configured as described above will be described.

That is, when moving the pickup 25 in the direction of arrow ψ), the feed motor 99 is driven clockwise in FIG. 19. Then, the second pulley 1 is moved by the belt 101.
02 is rotated clockwise in FIG. 19 in substantially the same way, the third pulley 109 is rotated counterclockwise in FIG. 19 by the worm 104 and worm gear 107. Therefore, the pickup 25 is moved in the direction of arrow e) together with the pickup mounting base 110 by the wire 112. By the way, the wire 119 wound 1.5 times around the third pulley 109 is connected to the spring 111. By maintaining a predetermined tension, the third pulley 109 is moved in response to the rotation of the third pulley 109.

In addition, when moving the shock absorber f25 in the direction of the arrow (Q), the worm 104 and the worm gear 10 are moved by driving the feed motor 99 counterclockwise in the figure.
7 etc. is reversed and the pickup 25 is moved in the direction of the arrow (Q), and the explanation thereof will be omitted here.

Here, in the pickup feed M mechanism 79, for example, if an impact force is applied from the outside to the big roller fzs, the impact force will be applied to the wire 112 and the fourth pulley 11.
3.

Therefore, the impact force is absorbed by the viscous resistance of the blade member 120 of the rotary blade 119 of the damper device 117 and the grease 121, thereby minimizing the influence of the impact force.

By the way, conventionally, in the pickup feeding mechanism, when an impact force is applied to the pickup 25 from the outside, the impact force is transmitted to the wire 112 via the pickup mounting base 110, causing a collision between the shell ohm 104 and the worm gear 107, and reducing the impact force. was being accelerated. However, by providing the damper device 117 in the pickup feeding mechanism in this way, the impact force from the outside is absorbed by the damper device 117, and the impact force is accelerated to the pickup 25. It is something that cannot be communicated.

Next, the switch driving device SO (see FIG. 14) that drives the switch 26 for detecting the pickup position will be described. FIG. 20 shows the switch driving device 80 of FIG.
This is what is extracted and shown.

That is, in FIG. 20, 77 indicates the pickup 2.
5 is a pickup mounting member that is supported, and at the upper end of this pickup mounting member 77, there is a substantially plate-shaped adjustment member 126 formed in an oval shape on the side. Through hole 77 of mounting part hole 77
It is screwed in with a screw 128 in a state where it is locked at zero.

The adjustment member 126 is made of an elastic material, for example, a metal material, and has an abbreviated protrusion 129 in the middle of one end, and the tip thereof is parallel to the other end of the adjustment member 126. It is formed by

A driving section 1 having an inclined section 130 corresponding to the protruding section 129 is provided at an intermediate portion of the other end of the adjusting member 126.
31 is protruded i''L) The inclined part L30 of this drive part 131
An elongated hole 132 is formed in the elongated hole 132. An adjustment screw 133 is inserted into the elongated hole 132 and is screwed into the protrusion 129. The inclination angle of the inclination part 130 of the drive part 131 is adjusted.

That is, the drive section 131 of the adjusting member 129 attached to the pickup mounting member 77 is positioned in the direction of the pickup 2 with respect to the pickup position detection switch 26 (see FIG. 14).
5 is the reference point position mentioned above (inner circumference of loaded disk)
The adjustment screw 133t is adjusted so that the drive section 131 drives the switch 26 in the state where the switch 26 is located.

By integrally forming the driving part 131 and the adjusting member 126 in this way, fine adjustment can be easily performed compared to the driving part 131 and the adjusting member 126 that are formed separately, and the number of parts is reduced. Moreover, the work efficiency is improved.

Note that the switch driving device 80 is capable of driving not only the switch 26 for detecting the pickup position but also a photoelectric switch, a reed switch, etc. If a portion is formed, it can be easily driven.

Next, we will talk about the big pickup holding device that holds the pickup 25 at the base position (toward the inner circumference of the loaded disc). Figures 22(a) and 22(b) show the pickup 25 before and after it is fixed. It shows. That is, in FIG. 22(,), 18 is the sub-chassis, and the lower end of this sub-chassis 18 has a locking portion 134 protruding toward the main chassis 19 (see FIG. 14).
is formed. A screw hole 135 is formed in this locking portion 134, and a protrusion portion 137 having a through hole 136 is formed on the back surface of the sub-chassis 18 in correspondence with this screw hole 135. The through hole 136 is formed to have approximately the same diameter as the effective diameter of the screw hole 135.

At the lower end of the pickup mounting member 77 to which the pickup 25 is attached, a through hole 138 is formed in the protrusion 13 corresponding to the switch 26 for detecting the pickup position.
The through hole 138 is formed to have approximately the same diameter as the through hole 136 of No. 7.
6 is driven by the switch driving device 80, the switch 2 is slightly moved from the through hole 136 of the protrusion 137
It is formed in six directions.

Further, the lock bin 139 that fixes the pickup 26 near the base position (inner circumferential direction of the loaded disc) has a screw hole 135 in the bush chassis 18 that is located in the middle of the lock bin 139.
The threaded portion 140 is shaped accordingly. A fitting portion 14 is formed in the lock bin 139 from one end to the tip of the threaded portion 140 in correspondence with the through hole 136 of the protruding portion 137 and the through hole 138 of the pickup mounting member 77. , a sloped part 142 for insertion at its tip.
is formed.

Here, from the other end to the base end of the screw portion 140 of the lock bin 139, the diameter is approximately the same as the effective diameter of the screw 5140, and at the base end, for example, a parallel head 14 is formed.
3 is formed.

That is, when holding the pick-up 25 at the base position of the pickup 25 shown in FIG. It can be inserted into the through hole 136 and tightened by screwing the screw portion 140 together. Then, the lock bin 139 is inserted and fitted into the through hole 138 of the pickup mounting member 77 with the fitting part 141 shifted by the inclined part 142 at the tip thereof. For this reason, the pickup mounting member 77 is as shown in FIG. 22(b).
As shown in FIG.
6117) It is detached from the operation section 260.

Here, the lock bin 139 is held at that position on the sub-chassis 18 using, for example, a tightening ring 144 for preventing detachment.

In this way, the big acoustic sensor 25 is held at a position where the drive section 13 for driving the switch is slightly separated from the operation section 260 of the switch 26 for detecting the pickup position. For this reason, the switch 26 is protected, for example, in the transfer state.

Here, in the pickup holding device described above, the pickup mounting member 770 is configured on the opposite side to the switch 26 for detecting the pickup position, but it is not limited to this, and it is equally effective to configure it on the same side. It goes without saying that this invention is not limited to the embodiments described above and illustrated, but that various modifications can be made without departing from the spirit of the invention.

〔Effect of the invention〕

As described above, according to the invention, it is possible to provide an extremely good disk clamping mechanism that has a simple configuration and is easy to operate.

[Brief explanation of drawings]

FIG. 1 is an external perspective view showing an optical disc record playback device to which the present invention is applied, FIG. 2 is a side perspective view showing the loading mechanism shown in FIG. 1 taken out, and FIG.
4 is a detailed perspective view showing the pickup safety device and loading control mechanism of FIG. 2, and FIG. 5 is a block diagram showing the electrical circuit of the pickup safety device of FIG. 4. 6 is a detailed perspective view showing the operation of FIG. 4, FIG. 7 is a block diagram showing the electrical circuit of the loading control mechanism of FIG. 4, and FIGS. 8(a) and (b)
) are side and front views showing the disk clamping mechanism according to one embodiment of the present invention in FIG. 3, FIG. 9(a),
(b) and Fig. 10 (-), (b) are respectively the 8th
Figures (a), (b) (r) Side and front views showing the middle and rear of the crankshaft, Figure 11 is a side view showing the disc position regulating device in Figure 3, Figure 12 is the disc clamp in Figure 11. 13 is a partial sectional view showing a part of the holder shown in FIG. 2; FIG. 14 is a side perspective view showing the disk drive section and playback mechanism section shown in FIG. 1 taken out; FIG. 15 is a side view showing the rear. The figures are a perspective view showing the optical pickup mounting device of FIG. 14, and FIGS. 16(a), (b), and (e). (d) is a side, front, top, and bottom view showing the optical pickup mounting device in FIG. 15, and FIG. 17 is a cross-sectional view showing details of the focus offset adjustment section in FIG.
Fig. 8 is a sectional view showing details of mounting the pickup mounting member shown in Fig. 15, Fig. 19 is a perspective view showing the birafatuji feed mechanism shown in Fig. 14, and Fig. 20 is a part showing the damper device shown in Fig. 19. 21 is a perspective view showing the switch driving device in FIG. 14, FIG. 22 (,) is a sectional view showing the pickup holding device, and FIG. 22(b) is a perspective view showing the switch driving device in FIG. 22 (,). 010...Cabinet, 1...Loading mechanism section, 12...Eject key, 13...POWER key, 14...Display section, 15...First sectional view showing the holding state. an operation section, 16... a second operation section,
17...Third operation unit, 18...Sub chassis, 1
9... Main chassis, 20° 21... Extension part, 2
2...Front holder, 23...Lid, 24...Rear holder, 25...Pickup, 26...Switch for detecting pickup position, 27...Disc holder, 2
8... Reflective photo sensor, 29... Reflective photo sensor, S... Eject mechanism, 31... Eject lever, U... Loading control mechanism, 33... Mouth,
slider, 34... damper mechanism, 35... sector gear, 36... reduction gear, 37... damper, 38...
... Gear, 39 ... Guide part, 4θ ... Guide groove, 4 No. ... Guide shaft, 45 ... Disk clamp mechanism, 47 ... Laser switch, 48
... Drive part phase, 49 ... Control circuit, 50 ... Laser power supply circuit, 51 ... Laser power supply circuit, 52 ... First solenoid sylanger, 53 ... First drive member , 54... Eject shaft, 55... Torsion spring, 56... Eject switch, 57... Second solenoid plunger, 58... Second drive member, 59... Solenoid drive circuit, 60... Power supply detection circuit, 61... Solenoid drive circuit, 62... Clamp regulating member, 63... Spring, 64... Spring member,
65... Screw, 66... Clamp part, 67... Disc position regulating device, 68... Disc position regulating member, 69.70... Arm part, 71... Rotating shaft, 72
...adjustment member, 73... member, 74... urethane beads, 75... polyurethane resin paint, mu''...
Optical pickup mounting device, 77... Pickup mounting member, 78... Guide section, 79... Optical pickup feeding mechanism, go... Switch drive device, 8...
... Drive unit, 82... Printed wiring board, 83... First mounting member, 84... Twentieth mounting member, 85... Fixing screw, 86... First hexagonal socket' IA child, s y・
・・Washer, 8B・・Focus off-center) R adjustment part, 89・・Eccentric cam, 90-°° wave washer, 91
...first bushing, 92...a child, 93...first adjustment section, 94...second bushing, 95...screw, 96...second hexagon socket Screw, 97... Washer, 98... Second adjustment member, 99... Feed motor, IQO... First pulley, 101... Belt, 1
θ2...second goo'), 1o3...axis, 104.
...Worm, 105...Screw, 106...Bearing,
207...Worm gear, JOB...-axis% 109
...3rd (D-j'-'), 11θ...pickup mounting base, 11th...spring, 112...wire, 113...4th pulley 1.1.14...・Rotation center shaft, 115...Bearing, 116...B ring,
117...4 dampers M, sx1g...Case, 1
19...Rotating blade, 120...Blade member, 12
No... Grease, 122... Fitting part, 123, 12
4... Locking part, 125... Spring, 126... Adjustment member, 127... Hook part, 128... Screw, 12
9... Projection part, 13o... Inclined part, 131... Drive part, 132... Long hole, 133... Screw, 134...
...Locking part, 135...Screw hole, 136...Through hole,
137...Protrusion, 138...Through hole, 139...
Lock pin, 140... Threaded part, 14... Fitting part ~ 142... Inclined part, 143... Head, 144...
...E-ring. Applicant's representative Patent attorney Takehiko Suzue Figure 8 (b) 67-/ Figure 9 (a) Figure 9 (b) Figure 10 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14] Fig. 15 7 Fig. 16 (a) (b) Sob (C) (d) Fig. 17 9 Fig. 20 Fig. 21

Claims (1)

[Claims] It has a first holder facing the back surface of the disk, a second holder rotatably attached to the first holder and facing the front surface of the disk, and is supported on the front surface of the cabinet so as to be openable and closable. a part of the holder, and the first and second
The second holder is provided so as to be able to move in and out between the holders, and in the open state, the second holder
A disc clamping mechanism 0, characterized in that it is provided with a disc clamp part that is located on the holder side of the holder and that clamps the disc with a disc holder that protrudes from the second holder in a closed state.