JPS5940331A - Optical pickup holding device - Google Patents

Abstract

PURPOSE:To fix assuredly an optical pickup with a simple constitution, by providing a pickup attachment member and a shifting lock screw which is screwed into the pickup attachment member and fixes the attachment member in shifting from a base point. CONSTITUTION:When a pickup 25 is held at a base point, a lock pin 139 is put through a screw hole 135 of a subchassis 18 and a through hole 136 of a projected part 137 and then fastened. Thus the pin 139 is fitted to a through hole 138 of a pickup attachment member 77 having a slightly shifted matching part 141 by means of a slopping part 142 formed at the tip of the pin 139. Therefore the member 77 is shifted in the direction Y in the figure, and a switch driving part 131 moves to detach from an operation part 260 of a switch 26 for detection of pickup position. Then the pin 139 is held by the subchassis 18 by a fastening E ring 144 to prevent from detachment. In such a way, the pickup 25 is held with the part 131 set with a slight space from the part 260.

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 in particular to improvements in the holding device for the optical big amplifier. Regarding.

Technical background of invention C and its problems] Recently, in the field of audio equipment, digital recording and reproducing methods using PCM (pulse coat modulation) technology are being adopted in order to achieve as high fidelity as possible. . Tsumashi, this is what is called digital audio conversion.
This is because it has been established in principle that the audio characteristics of T-ZAGO depend on the characteristics of the recording medium, making it much superior to conventional analog systems. In this case, a system that uses a disk as a recording medium is called a DAD system, and its playback method is also optical,
Electrostatic and mechanical methods have been proposed, but
Regardless of which playback method is adopted, the playback device that embodies it must be capable of satisfying various advanced functions and performances not found in conventional playback methods. .

For example, among optical playback systems, the one proposed as a CD (compact disc) system has a diameter of 12 mm.
An optical disk with a thickness of 1.2 mm is driven by the CLv (constant linear velocity) method at variable rotational speeds of approximately ZOO~500 r, p, m. It is easy to understand that the pitch is 1.6 μm and a huge amount of information is recorded on one side, enabling stereo reproduction of approximately 114 intervals.

In addition, the above disc is a digital (Pc
t) Pit (unevenness with different reflectance) corresponding to conversion data
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 an optical pickup holding device that has a simple configuration and can securely fix an optical pickup.

[JI of invention! i, essential]

That is, the present invention provides an optical pickup for reproducing a disc in a linear tracking manner, a pickup mounting member for supporting the pick amplifier so as to play back the disc in a linear tracking manner, and an optical pickup that is screwed into the pickup mounting member. The pickup mounting member is characterized by comprising a transfer lock screw that fixes the pickup mounting member in a state shifted from the base position.

[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 a perspective view of the external appearance of an optical disc record playback device using the CD system, and shows a DAD (hereinafter referred to as disk) loading mechanism section 11 provided on the front panel of a cabinet 10.
The disc is rotated in the direction of the arrow ^ in the figure by operating the eject (EJECT) key 12 in a so-called kangaru-pocket style, and a disc (not shown) is inserted vertically into the pocket for vertical playback. , which is carried into and loaded into the driving position, and the details will be described later.

Note that (POWHR) 1″3 in FIG. 1 is a power key that is operated prior to operating the eject key I2.Hereinafter, on the upper right side of the loading mechanism unit 11, there is a display unit 14 and a so-called A first operation unit 15 provided with a reverse key (Rgv) for backward operation, a fast forward key (FF) for forward operation, and a play key (PLAY) for play operation.
Also located in the middle row are the next gray key (NKXPL AY) and repeat key (Rgpg
A second operation section 16 is provided with a BOSE key (PAUSE) and a stop key (STOP). Also in the lower row, there is a third operation section with number keys 0, 1, 2...9, a memory read key (uugAD), a memory key (MgMoRY), and a clear key (cLg8R). I7 is located.

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, which is arranged in parallel with a substantially box-shaped main chassis 19 at a predetermined interval.
Extensions 20.2 are provided at both ends of the main chassis 190, respectively.
1. And the above sub-chassis 1
At 8, the lower portions of both ends of the front holder 22 are rotatably supported, and the front holder 24 has a lid 23 attached to its front part, and is always supported by an arrow δ A by a torsion spring (not shown). biased in the direction. In addition, the above subshane 1
A rear holder 24 having a substantially U-shaped side surface is provided between the front holder 8 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. Here, the front and rear holders 22.24 include:
The front holder 2 is coated with a resin such as polyurethane resin to protect the disc, details of which will be described later.
For example, a pair of arm portions, which will be described later, are formed at the lower end portion of the disk drive member 2 for regulating the disk position.

Here, the opening 18 formed in the sub-chassis 18
1, an optical pickup 25 for signal reading supported by a mounting device to be described later is protrudingly provided. This pickup 25 is attached to the main shaft 19 by arrow C.
The opening 18 of the above-mentioned bunker 18 is supported so as to be slidable in the direction D, and is driven by a pickup drive mechanism to be described later.
1 is slidably driven.

A switch 26 for detecting the position of the pickup amplifier is provided approximately at the upper end of the rear surface of the sub-chassis I8. ) is supported at the upper end of the pickup 26 by a switch to be described later,! It is turned on by the @ operating device.

A disk holder 27 is rotatably supported approximately at the center of the sub-chassis 18.

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 rotated and driven in a predetermined state.The disk receiver 27 is loaded near the lower end thereof. A reflective photosensor 28 is provided to detect the presence or absence of a disc. The rotation of the disc holder 270 is detected by a reflective photo sensor 29 for detecting rotation of the disc holder provided in the sub-chassis 18.

Furthermore, an IM mechanism 3o (described later) is provided at one end of the sub-chassis 18, and this eject mechanism is activated, for example, when the eject operation Ft=lever 31 is operated in the power ON state. The lock slider 33 is slid in the direction of arrow E through the loading control mechanism port to unlock the front holder 22, and the lock slider 33 is directly moved in the power OFF state.
The front boulder 22 is unlocked by operating the front boulder 22. When the lock is released in this way, the front and rear holders 22 and 24 are moved to the damper 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, and is meshed with a gear 38 supported by a damper 37 via reduction gears 36 supported by the extensions 21, respectively. Therefore, the front holder 22 is loaded into the closed state when pressed in the direction of the arrow 1, and is also loaded into the open state by its own weight and the biasing force of the torsion spring. On the other hand, the rear boulder 24 is connected to the sector gear 3 of the front holder 22.
Since the guide shaft 41 implanted in the extending portion 21 is inserted into the guide groove 4o of the illustrated shape of the guide portion 39 arranged in parallel with the Loading is performed. and,
In the closed state of the front and rear holders 22 and 24,
The disk 45 inserted between the front holder 22 and the rear holder 440 is pressed against the disk receiver 27 and rotated together with the disk clamp mechanism supported by the front holder 22 in the closed state. There is.

Here, the above-mentioned optical disc record playback device automatically drives the disc 45 (see FIG. 3) when the M23 is closed.
is rotated and placed in a playback standby state, for example. That is, FIG. 4 shows the configuration of a safety device against lasers. At the lower end of the extension part 20 at one end, two circuit-independent laser switches 47 are installed so that the contact part is directed toward the lid. 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 an abbreviated shape on the 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 turned OFF together with the lid 23 when the lid 23 is opened. It is designed so that 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 laser 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 490. This control circuit 49 has another input terminal connected to the output terminal of the reflective photosensor 28 for detecting the presence or absence of the disc, and
The input end of the laser APC circuit 50 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 third row m) is inserted and the lid 23 is closed, the reflective photosensor 28 outputs a disc presence detection signal (hereinafter referred to as D SET).
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, from this control circuit 49, the laser APC circuit 5
0, a laser 0N-OFF control signal (hereinafter referred to as LDC signal) is output, and the laser APC circuit 50 to which this LDC signal is input energizes the pickup 25 to emit a laser (LAGEAR). be.

Here, for example, if the disk 45 (see FIG. 3) is not attached and the lid 23 is closed, the reflective photosensor 2
Since the DBET signal from 8 is not input to the control circuit 49, no laser is emitted from the pickup 25. Furthermore, when the disc 45 (see FIG. 3) is inserted and the lid 23 is open, the DLK signal from the first switch 471 is not input to the control circuit 49, so the laser is emitted from the pickup 25. It is something that cannot be done.

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 [ There is no emission of radiation.

In this way, a double safety structure is provided in which the laser beam is emitted from the pickup 25 only when the disk 45 is attached and the lid 23 is closed. For this reason,
For example, even if the control circuit 49 etc. breaks down, the lid 23
The laser power source 51 is controlled by the switch 47 that is linked to the opening and closing of
Since this is turned off, erroneous laser emission is reliably prevented.

Next, the loading control mechanism 32 in the operating state of the optical disc record reproducing apparatus will be described. That is, as shown in FIG. 41, the extension part 20 provided with the laser switch 47 has first and second mounting parts 201 and 202 protruding outward from its upper and lower ends, respectively. It is formed. Of these, the first solenoid plunger 52 is attached to the first attachment portion 201 with the iron core portion 620 facing toward the lid 23 . and,
One end of the first drive member 53 is supported by the iron core portion 520 of the first drive member 53 . The first drive member 53 is attached at an intermediate portion thereof to the first mounting portion 201 near the iron core portion 520 by an arrow H.
, I, and the other end thereof is supported movably in the M direction, with the other end pointing to an eject shaft 64 that supports the eject lever 31 rotatably in the directions of arrows J and I. .

Here, the eject shaft 54 is formed to protrude from the eject lever 3I, and a torsion spring 55 is engaged at the tip thereof so as to bias the eject lever 31 in the direction of arrow M and in the direction of the arrow. It is worn.

Further, the eject lever 31 has a protrusion 3Iθ on the front unit that engages with a protrusion 330 of the lock slider 33, which is supported at one end of the sub-chassis 18 so as to be slidable in the directions of arrows E and F. is formed.

Here, the eject lever 31 is formed with a protruding part 311 for driving the switch, and when the eject lever 31 is operated, the eject switch 56 provided on the extending part 20 is driven. ing.

On the other hand, the second attachment part 202 of the extension part 20 has a second
A solenoid plunger 57 is attached with an iron core 570 facing toward the lid 23, and one end of a second drive member 58 is supported by the iron core 570. This second 5 small shaft portion 57 is supported at its intermediate portion by the extension portion 20 of the iron core portion 560hfM so as to be rotatable in the directions of arrows J and K, and is formed at the other end. A holding portion 570 is formed on the protrusion 33 at the lower end of the lock slider 33.
Holding 1.

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 lock portion 332 locks the protrusion 5220 of the front holder 23 to lock the can 23 in the closed state.

Next, the operation of the loading control mechanism bow configured as described above will be explained. That is, when the lid 23 is closed, the protrusion 22 of the front holder 22
0 is firmly latched to 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 ejector (L/
Lock slider 3 in which bar 31 engages with projection 310 of torsion spring 53 against the spring force
3 to slide the lock slider 31 in the direction of arrow E. At this time, the lid 23 is attached to the front holder 2 by the lock portion 332 of the lock slider 33.
When the second protrusion 220 is released, it is loaded and opened as described above.

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 driving member 53 is rotated in the direction of the arrow, and the eject lever 31 is moved in the direction of the arrow. The protrusion 330 is in a non-coupled state. In this state, when the eject lever 31 is pressed, the protrusion 310 of the eject lever 31 does not press the protrusion 330 of the lock slider 33, and the protrusion 311 for actuating the switch does not press the protrusion 330 of the lock slider 33.
Turn on 5. Therefore, this eject switch 55
An eject signal (hereinafter referred to as an 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 pickup 25 is returned to the base point and the switch 26 for detecting the pickup position is turned on, and the disk holder is a reflective type for detecting rotation. When a stop detection signal (hereinafter referred to as DTAC signal) of the disk receiver 27 is inputted to the photo sensor 29, an ejection completion detection signal (hereinafter referred to as EJCT signal) is outputted to the second solenoid plunger 56.
is energized for a predetermined period of time to drive the second solenoid plunger 56 once. Therefore, the iron core portion 560 of the second solenoid plunger 56 rotates the second driving member 58 in the direction of arrow J, and moves the lock slider 33 with arrow E.
Press in the direction. This reservoir lid 23 is attached to the front holder 22.
When the lock is released in substantially the same way, it is loaded and becomes open.

Here, the electrical circuit of the loading control mechanism 32 will be described. That is, in FIG. 7, 52 is the first
This first solenoid plunger 52 has a solenoid drive circuit 59 connected to a power generation detection circuit 6°, and is driven depending on the power source.

A long eject switch 56, a laser switch 47,
The pickup position detection switch 26 and the reflective photosensor 29 are each connected to each input end of the control circuit 49, and the output end of the control circuit 49 is connected to the second solenoid plunger 57 via a solenoid drive circuit 61. ing.

If the power is turned off while the lid 23 is closed, the power detection signal from the power detection circuit 60 will not be output, so the first solenoid plunger 52 will not be driven by the force <as described above. The lid 23 is opened by pressing the eject lever 31.

On the other hand, when the power is turned on, the power supply detection circuit 601/
The stain source detection signal r- is output, and the first solenoid granger 52 is driven by one. When the EJgCT/C-5r is pressed and swept, the EJgCT signal from the eject switch 56 is sent to the control circuit 4.
9 is input.

Therefore, when the pickup 25 is at the base position, the control circuit 49 returns the pickup 25 to the base position and applies the SL signal of the pickup position detection switch 26 and a brake (not shown) when the disc holder 27 is rotating. The DTAC signals from the type photo sensor 29 are respectively input,
Moreover, when the DLK signal from the laser switch 47 is input, the EJECT signal is output. And this E
The solenoid drive circuit 61 to which the JECT signal is input,
The second solenoid plunger 57 is driven 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 has been ensured, M2
S is ejected, and its handling is extremely simple.

Next, a disc clamping mechanism for pressing the disc 45 against the disc receiver 27 with the lid 23 closed will be described. (See Figures 2 and 3) That is, Figures 8(a), (b), and 9(a)
, (b) and FIGS. 10(a) + (b) respectively show a state in which the disk 45 is inserted into the holder, a state in which the holder begins to rotate in the direction of the arrow, and a state in which the disk 45 is completely loaded into the disk receiver 27. It indicates the condition. 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 FIG. Further, on the front side of the front holder 22, a clamp regulating member 62 is attached to a rotating shaft 620 with a υ arrow N,
It is rotatably supported in the O direction. This lamp regulating member 6
2 is biased in the direction of arrow N by a spring 63;
The middle part of the substantially plate-shaped spring member 64 is attached to the front part by a screw 65.
It is widely supported. One end of this spring member 64 faces the through hole 221 of the front holder 22, and a bottomed cylindrical clamp portion 66 is rotatably supported at this one end. This clamp portion 66 has the disk 45 at its tip.
A collar portion 660 is formed to lock the vicinity of the hole, and is fitted into a protruding fitting portion 270 formed approximately at the center of the disk receiver 27. Further, at the other end of the spring member 64, a pair of suppressing portions '640, 64 are provided approximately in parallel.
1 is formed.

One of the suppressing parts 64θ faces the arm part 240 formed on the rear holder 24, and the other pressing part 641 faces the arm part 1 formed on the sub-palm 18.
It is facing 80.

Here, the operation of the disk clamp mechanism configured as described above will be described. -if, Fig. 8←), (
In the state where the disk 45 as shown in b) is inserted between the front holder 22 and the rear holder 23, the clamp regulating member 62 is such that the pressing parts 640, 641 of the spring member 64 are engaged with the arm parts 240, 180, respectively. Since they are not fitted together, they are rotated most in the direction of arrow N by the biasing force of the spring 63, and the beam 2 ring portion 66 does not protrude into the through hole 221 of the front holder 22. At this time, the disk 45 is supported at its peripheral edge by a disk position regulating device, which will be described later, and at the same time, one side thereof 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 arrow A, the damper mechanism U described above is reversed and the front holder 22 is moved in the direction of arrow A. Rotated. At this time, the guide shaft 41 is inserted into the guide groove 40 of the guide portion 39 of the rear holder 24, so that the rear holder 24 is rotated in the direction of the arrow while being slid in the direction of the disk receiver 2-7. 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, the clamp regulating member 62 is attached to the front and rear holders 22.2.
4 is rotated, the arm portion 240 of the rear holder 24 comes into contact with and presses one of the pressing portions 640 of the spring member 64, and is rotated in the direction of arrow 0. 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 closed by the lock portion 332 of the lock slider 33, as shown in FIGS. 10(a) and 10(b). Locked in position. At this time, the spring member 64 has the other pressing portion 641 pressed against the sub-chassis 18.
Because the clamp part 66 is pressed by the arm part 180 of the front holder 22, the clamp part 66 is projected from the through hole 221 of the front holder 22, and is fitted into the fitting part 270 of the disc receiver 27 via the disc 45, where the disc is inserted. 45 is completed.

Here, one of the suppressing parts 640 of the spring member 66 is used to protect the disc 45 by its spring force when the clamper part 66 presses the disc 45 too much, and when the disc 45 is in a state where protection is not required. In other words, the spring force has no effect on either of them.

In addition, when taking out the disk 45, the disk clamping mechanism performs the reverse operation of the above-mentioned loading operation by operating the eject lever 31 (see FIG. 4) as described above, and the disk 45 can be taken out easily. Therefore, its explanation will be omitted here.

In this way, the clamper section 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 D32450 can be attached and detached extremely easily.

Here, a disk position regulating device for regulating the position of the disk 45 when the disk 45 is loaded into the disk receiver 27 will be described. That is, FIGS. 11 and 12 respectively show a state in which the disk 45 is inserted into the holder portion and a state in which the disk 45 is completely loaded into the disk receiver 27. Here, in Figure 11, 45
is the disk described above, and the peripheral edge of this 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 has arms and portions 69° 20 at both ends that support the peripheral edge of the disk 45.
is formed. And these arm parts 69.70
At the upper end of each, there is a roughly V-shaped j holding part 69 in the middle part.
5,700 are formed, and these holding parts 690.7
The disk 45 is loaded in a substantially vertical state 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 71 is
It is rotatably supported at the lower end of the front holder 22.

Here, the disk position regulating member 68 has a rotating shaft 71
A torsion spring (not shown) is engaged so as to apply a spring force in the direction of arrow B, so that the lower end of the bottom thereof is engaged with the engagement portion 222 formed on the front holder 22. ing. Therefore, the disk position regulating member 68 and the front holder 22 rotate together.

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 disc position regulating member 68. By adjusting the adjusting member 72, the stroke of the disk position regulating member 68 is adjusted.

That is, as mentioned above, when N23 is open, the front
When the disk 45 is inserted between the surface holder 22 and the rear surface holder 24, as shown in FIG.
Supported by 0. At this time, the disk 45 is tilted by the holding portions 690, 700 of the disk position regulating member 68, and its surface portion is brought into contact with the front holder 22. Here, when the front holder 22 is rotated in the direction of arrow A, the disc 45 rotates together with the front holder 22 while its inclination angle is regulated by the holding portions 690 and 700 of the disc position regulating member 68. The hole of the disk 45 is made to face the fitting part 270 of the disk receiver 27. Furthermore, when the front holder 22 is pressed, the front holder 22 is locked by the locking mechanism as described above, and the disc 45 is pressed against the disc receiver 27 by the disc clamp mechanism described above. be. At this time, the bottom of the disk position regulating member 68 is engaged with the adjusting member 72 of the sub-chassis 18 . For this reason, the disk position regulating member 68
The arm portions 69 and 70 are separated from the peripheral edge of the disk 42 by a tone spring of the rotation shaft 71.

Furthermore, when the above-mentioned eject lever 31 (see Fig. 4) is operated to eject the loaded disk 45, the above-mentioned disk position regulating device operates in a manner substantially opposite to the loading operation. A description of the operation will be omitted here.

In this way, the disk 45 is moved to the disk position regulating member 68.
The lid 23 is configured to be regulated from the open state to the time when the lid 23 is pressed into contact with the disk receiver 27 by the disk clamp mechanism. For this reason, the disk 45 does not make clicking noises or dances due to changes in the inclination angle, and its protection is ensured.

Here, protection means formed on the front and rear holders 22, 24 for the disk 45 to be inserted will be described. (See Figure 2) That is, in Figure 13, 73 represents the front and rear holders 22 and 23.
The surface of this member 73 is made of, for example, synthetic resin, and has a suitable elasticity, for example, 20 to
A two-component polyurethane resin paint 75 mainly composed of, for example, urethane beads 74 foamed into spherical shapes of 60 μm is applied.

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 resin paint 75 Urethane beads 7
4 is in a state of being crushed by a disk 45.

Therefore, it goes without saying that the elasticity of the polyurethane resin paint 75 increases depending on the thickness of the urethane beads 74 layer, and the thickness of the layer can be adjusted as necessary. All you have to do is adjust it.

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 pickup mounting device (details of which will be described later) with a lens portion 250 corresponding to the disc holder 27. It is disposed in an opening 181 in the sub-chassis I8. The pickup 25 has a pair of guide portions 78.7 arranged in parallel above and below the main chassis 19 on its back side via the pickup mounting member 77.
8, and is supported at its lower end so as to be slidable in the directions of arrows P and Q on an optical pick amplifier feeding mechanism, which will be described in detail later.

Further, at the upper end of the pick amplifier mounting member 77, a switch driving device U, the details of which will be described later, is disposed. This switch driving device U has a driving portion 81 facing the operating portion 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 portion of the disk to be loaded). The switch 26 is driven in the state in which this state is reached.

Here, a pickup holding device (not shown), which will be described later, is provided at the lower end of the sub-chassis 18.
This pickup holding device allows the pickup 25 to be fixed to the subchassis 18, for example, when the DAD reproducing device is being transported.

Now, referring to the pickup mounting device U that adjusts the angle of the pickup 250, FIGS. 15 and 16 (a), (b), (c), and (d) show the entire pickup mounting device, respectively. - side, front, top and bottom sides;

Further, FIGS. 17 and 18 show the focus offset adjusting section and the base axis of the pickup 25 shown in FIG. 15.

That is, in FIG. 15, reference numeral 25 denotes a pink-up formed into a substantially rectangular parallelepiped, and this pickup 25 has a lens portion 250 formed at the lower front surface thereof, and a print for controlling the pickup 25 on the side surface thereof. A cast board 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 83.8
4 is a fixing screw 8 at the lower part of one side of the pickup 25.
5 is screwed on. The second mounting member 84
A long hole 840 is formed at a position corresponding to the upper part of one side of the pickup 25, and a first hexagon socket head screw 86 is inserted into the long hole 840 via a washer 87 to perform the first mounting. The member 83 and the pickup 25 are screwed together.

In addition, the first and second mounting members 83 and 84 have through holes 8 corresponding to the printed wiring board 82 of the pickup 25.
．． 30.1141 is formed, and this through hole 830
, 841, a focus set adjusting portion shown in FIG. 17 is formed. This focus set adjustment section 8
8, an eccentric cam 89 for adjustment is inserted into the through hole 842 formed in the second mounting member 84 through a wave washer 90, and this eccentric cam 89 is inserted into a screw 92 through a first bushing 91. It is screwed onto the first mounting member 83 and the pickup 25.

Here, near the first hexagon socket screw 86 at the upper end portions of the first and second mounting members 83 and 84, there is a groove for adjusting the pickup 25 in the directions of arrows R and S (track groove direction). One adjustment section 93 is formed, and this first adjustment section 93
With this operation, the pickup 25 is attached to the first mounting member 83.
At the same time, the first bushing 91 is rotated about the rotation axis to perform adjustment.

Further, the pickup 25 is provided with a substantially U-shaped pickup mounting member 77 on the back surface thereof. Both ends of the pickup attachment assembly 77 are placed on both ends of the second attachment member 84, and these ends are located approximately directly above the lens portion 250 of the pickup 25 and the 18th vertebrae.
As shown in the figure, a screw 95 is screwed onto the second mounting member 84 via a second bushing 94.

Further, an elongated hole 770 is formed at the upper end of the pickup mounting member 77, and a second hexagon socket screw 96 is inserted into the elongated hole 770 via a washer 97 to connect the second mounting member. 84 is screwed on.

Further, in the vicinity of the second hexagonal socket screw 96 at the upper end of the pink-up mounting portion 77 and the second mounting member 84, there are holes for adjusting the pickup 25 in the arrow ■ and W directions (radial tracking direction). Two adjustment portions 98 are formed.

Here, the pickup mounting device configured as above
Let's talk about the action of okyo. In other words, Big Amp 2
To adjust the focus offset knob No. 5 in the X and Y directions, first loosen the first hexagon socket screw 86 and the fixing screw 85.

Then, when the screw 92 of the focus offset adjustment section is rotated with a screwdriver (not shown), the eccentric cam 89 is rotated, and the pink-up 25 is moved together with the first mounting member 83 in the arrow XfQ or Y direction. In this way, a predetermined focus offset is set.

If you still wish to adjust the pickup 25 in the directions of arrows FL and B (track groove direction), use the first hexagon socket screw 86 and the fixing screw 85 in the same way as the focus offset adjustment.
loosen. When, for example, a screwdriver is inserted into the first adjustment part 93 and pressed in a predetermined direction, the big amplifier 25
is rotated together with the first mounting member 83 about the first bushing 92 in the direction of the arrow R or S to adjust the direction of the track groove.

Furthermore, when adjusting the arrow v and W directions (radial tracking direction) of the pickup 25, the second hexagon socket screw 96 is loosened. Then, when a screwdriver, for example, is inserted into the second adjustment part 98 and pressed in a predetermined direction, the big amplifier 25 is moved along with the first and second mounting members 83 and 84, with the second bushing 94 as the center, and the arrow
It is rotated to adjust the radial tracking direction.

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

In addition, the pickup 2 mentioned above? ) adjustment of the focus offset and adjustment of the track groove direction are performed in the first step, respectively.
This is done by loosening the hexagon socket screw 86 and the fixing flange 85, but by first setting the focus offset and then setting the track groove direction, the connection between the eccentric cam 89 and the second mounting member 84 can be adjusted. The focus offset position once set is not changed due to the overwhelming action of the wave washer 90 provided between the two.

By configuring the pickup mounting device H in this way, the pickup 25 can adjust its focus offset,
Adjustment in the track groove direction and adjustment in the radial tracking direction can be easily and reliably performed.

Next, referring to the pickup feeding mechanism, FIG. 19 shows the pickup feeding mechanism υ of FIG. 14 taken out.

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

In other words, 99 in FIG. 19 is the subchassis 1.
8 (see FIG. 14), and a first pulley 100 is fitted onto the shaft of this feed motor 99. The = side of the substantially loop-shaped belt 101 is wrapped around this first boot 9100, and this belt 101
The other end is wound around the second pulley 102.

A shaft 103 is fitted into the center of rotation of the second pulley 102, and a worm 104 is attached to the shaft 103 with a screw 10.
It is fixed by 5. The shaft 104 is supported by a substantially U-shaped bearing 106 so as to sandwich the worm 104, and this bearing 106 is connected to the subshaft 18 (
(see Fig. 14).

Further, the worm 104 is meshed with a worm gear 107, and this worm gear 107 is connected to the sub-chassis 18.
(See FIG. 14) is rotatably supported by a shaft 108 fitted to the shaft 108, and a third boob 9109 is integrally formed at one end thereof. This third pulley 1θ9 has
Pickup mounting base 110 and spring 11 in the middle part
One part of a substantially loop-shaped wire 112 with 1.5 turns is wound around the fourth pulley, and the other part of the wire 112 is wound around a fourth pulley. This fourth pulley 11
One end of the rotational center shaft 114 of No. 3 is supported by a bearing 115 supported by the sub-chassis I8 (see FIG. 14) using an E-ring 1° I6, and the other end is supported by the first
It is supported by a damper device 117 shown in FIG.

Here, as shown in FIG. 20, in this damper device 117, a blade member 120 of the illustrated shape of a rotating blade 119 is sealed together with grease 121 in a case 118, and the tip of the rotating blade 119 is provided with a substantially ring. A metal feeding portion 122 that protrudes in a shape is formed. This rotary blade 119 has the fourth pulley l in its center.
The rotation center shaft 114 of Z 3 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 prevention protrusion 124 formed at the other end.
．． 124 is a spring 125 whose one end is locked to the subchassis 18 (see FIG. 14), and the subchassis I8 (see FIG. 14).
(see FIG. 14), respectively. Therefore, the case 118 is stopped at the illustrated position relative to the rotation of the fourth pulley 113.

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

Here, the operation of the pick amplifier transport mechanism constructed as described above will be described.

That is, when moving the pickup 25 in the direction of arrow P, the feed motor 99 is driven clockwise in FIG. 19. Then the second goo +7 by belt IoIVrc
102 is rotated clockwise in FIG. 19 in substantially the same manner, 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 P together with the pink-up mount 110 by the wire 112.

By the way, the wire 119 wound 1.5 times around the third pulley 109 is moved in accordance with the rotation of the third pulley 109 because a predetermined magnetic force is maintained by the spring 111. It is something.

When moving the pickup 25 in the direction of arrow Q, the worm 104, worm gear 107, etc. are reversed by driving the feed motor 99 counterclockwise in the figure, and the pink up 25 is moved in the direction of arrow Q. It goes without saying that this is the case, so we will omit the explanation here.

Here, in the above-mentioned pick amplifier feeding mechanism, for example, if an impact force is applied to the pickup 25 from the outside,
The impact force is applied to the wire 112 and the fourth pulley IZ
3.

Therefore, the above-mentioned impact force is absorbed by the viscous resistance of the rotary blade 1190 of the damper device logo, the vane member 120, and the grease 121, thereby minimizing the influence of the above-mentioned impact force.

By the way, conventionally, in the pick amplifier feeding mechanism, when an external impact force is applied to the pink up 25, the impact force is transmitted to the wire 112 via the big amplifier mounting base 110, causing a collision between the shield ohm 104 and the worm gear 101. The impact force was accelerated. However, by providing the damper device logo on the pink-up feed mechanism U 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 8g (see FIG. 14) for driving the switch 26 for detecting the pickup position will be described. FIG. 20 shows the switch driving device B shown in FIG. 14.

That is, in FIG. 20, reference numeral 77 denotes a pickup mounting member on which the pink-up 25 is supported, and at the upper end of this big amplifier mounting member 77, there is a substantially plate-shaped adjustment member whose side surface is shaped like an abbreviated character. 126 is screwed with a screw 128 with a hook portion 127 formed at one end thereof being engaged with a through hole 770 of the pickup mounting member 77.

Further, this 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 thereof, and the tip thereof is arranged in parallel with the other end of the adjustment member 126. It is formed.

A driving part 131 having an inclined part 130 corresponding to the protruding part 129 is protruded from the middle part of the other end of the adjusting member 126, and the inclined part 130 of this driving part 131 has a long hole. 532 is formed. An adjusting screw 133 is inserted into the elongated hole 132 and is screwed onto the protruding portion 129. Depending on how tightly the adjusting screw 133 is tightened, the inclined portion 130 of the driving portion 131 can be adjusted. The inclination angle can be adjusted.

In other words, the drive unit 131 of the adjustment member 129 attached to the big amplifier mounting member 77 moves the pink up 25 to the above-mentioned base position (loaded) with respect to the big amplifier position detection switch 26 (see FIG. inner circumference of the disc)
The adjustment screw 133 is adjusted so that the drive unit 131 drives the switch 26 in the state where the switch 26 is located.

By integrally forming the driving section 131 and the adjusting member 126 in this way, fine adjustment can be easily performed and the number of parts can be reduced compared to when the driving section 131 and the adjusting member 126 are formed separately. This reduces the amount of work required and improves workability.

Note that the switch driving device 180 is capable of driving only the switch 26 for detecting the pink amplifier position, such as a photoelectric switch and a reed switch. If a magnet portion is formed, its driving can be easily expressed.

Next, let's talk about the pickup holding device that holds the pickup 25 at the base position (inner circumferential direction of the loaded disc). Figures f and f422 ←) (b) show the pickup 25 before and after it is fixed. It is. That is, in FIG. 22(a), I8 is the subchassis, and the lower end of this subchassis 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 132 having a through hole 136 is formed on the back surface of the sub-chassis 18 in correspondence with this screw hole 135. This 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 pink-up position.
It is formed to have approximately the same diameter as the through hole 136 of No. 7. Here, this through hole 138 is connected to the switch 2 for detecting the pickup position.
6 is driven by the switch drive loading bolt, the switch 26 is slightly moved from the through hole 136 of the protrusion 137.
It is formed so that it can be moved to different positions depending on the direction.

Also, a lock pink 139 fixes the pickup 26 near the base position (inner peripheral direction of the loaded disc).
The screw hole 135 of the sub-chassis I8 is located in the middle part of the
A threaded portion 140 is formed correspondingly. The lock bin 139 has a fitting portion 141 extending from one end of the threaded portion 140 to the tip thereof through the through hole 136 of the protruding portion 137.
and is formed corresponding to the through hole 138 of the big amplifier mounting member 77, and has a sloped portion 14 for insertion at its tip.
2 is formed.

Here, the dimension from the other end to the proximal end of the threaded portion 140 of the lock pin 139 is formed to be approximately the same as the effective diameter of the threaded portion 140, and the proximal end has a parallel head 143, for example.
is formed.

That is, when holding the pink-up 25 at the base position of the pickup 25 shown in FIG. It is inserted into the through hole 136, and the screw portion 140 is screwed together and tightened. Then, the lock bin 139 is inserted and fitted into the through hole 138 of the big amplifier mounting member 77 with the fitting part 141 slightly shifted by the inclined part 142 at the tip thereof.Therefore, the pink up mounting member 77 Figure 22(b)
As shown in FIG.
6 is removed from the operation section 260.

Here, the lock bin 139 is held at that position on the sub-chassis 18 using an E-ring 144 for preventing it from coming off, for example, for tightening.

In this way, the pickup 25 is held at a position where the drive section 131 for driving the switch is slightly separated from the operating 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 above-mentioned big amplifier holding device, the big amplifier mounting member 770 is configured on the opposite side to the switch 26 for detecting the pick amplifier position, but the configuration is not limited to this, and it is equally effective to configure it on the same side. It is.

It goes without saying that the present invention is not limited to the embodiments described above and illustrated, and 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 optical pickup holding device which has a simple structure and can securely fix an optical pink amplifier.

[Brief explanation of the drawing]

The first factor is the external perspective view showing the CD-type DAD playback device to which the present invention is applied. 4 is a detailed perspective view showing the pickup safety device and loading control mechanism of the vJ2 diagram; FIG. 5 is a block configuration diagram showing the electrical circuit of the pickup safety device for the fourth cause; 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 shown in FIG. 4, and FIG.
a) and (b) are side and front views respectively showing the disk clamp mechanism in Fig. 3, and Fig. 9 (a) and (b).
and Fig. 10<a)l (b) are respectively Fig. 8(a)
), (b) is a side and front view showing the middle and after clamping, FIG. 11 is a side view showing the 7-disk position regulating device in FIG. 3, and FIG. 12 is a side view showing the disk after clamping in FIG. 11. )I! FIG. 13 is a partial sectional view showing a part of the holder in FIG. 2, FIG. 14 is a side perspective view showing the disc drive section and playback mechanism section in FIG. 1 taken out, and FIG. 15 are perspective views showing the optical pickup mounting device of FIG. 14, 16th n (a) + (b), (c),
(d) is a side, front, top and bottom view showing the optical pickup mounting device of FIG. 15, respectively, and FIG.
5 is a sectional view showing details of the focus offset adjustment section, FIG. 18 is a sectional view showing details of mounting the pickup mounting member of FIG. 15, and FIG. 19 is a perspective view showing the pickup feeding mechanism of FIG. 14. Figure 20 is the graph of Figure 19.
21 is a perspective view showing the switch driving device of FIG. 14, FIG. 22(a) is a sectional view showing a pick amplifier holding device according to an embodiment of the invention, FIG. 22(b) is a sectional view showing the holding state of FIG. 22(a). DESCRIPTION OF SYMBOLS 10... Cabinet, 11... Loading mechanism section, 12... Eject key, 13... POWgR
key, 14...display section, 15...first operation section, 1
6... Second operating section, 17... Third operating section, 18
...Sub chassis, 19...Main chassis, 20
．． 21... Extension portion, 22... Front holder, 23...
・Lid, 24...Rear holder, 25...Pickup, 26...Switch for big amplifier position detection, 27
...Disc holder, 28...Reflection type photo sensor, 2
9... Reflective photo sensor,... Eject mechanism, 31... Eject lever, 32-... Loading control mechanism, 33... Lock slider, 34-...
damper mechanism, 35... sector gear, 36... reduction gear, 37... damper, 38... gear, 39... guide section, 40... guide groove, 41... guide shaft, 45...
Disc, 46...Disc clamp mechanism, 47...
・Laser switch, 48... Drive member, 49...
- Control circuit, 50... Laser APC circuit, 51...
Laser power supply circuit, 52... first solenoid plunger, 53... first drive member, 54... eject shaft, 55... torsion spring, 56... adjustment, ecto switch, 57... - Second solenoid plunger, 58... Second drive member, 59... Solenoid drive circuit, 60... Power supply detection circuit, 6... Solenoid drive circuit, 62... Clamp regulating member, 63・
... Spring, 64 ... Spring member, 65 ... Screw, 66
... Clamp part, 67-... Disk position regulating device,
68... Disk position regulating member, 69.70... Arm portion, 71... Rotating shaft, 72-... Adjusting member, 73
... member, 74... urethane beads, 75... polyurethane resin paint, 76-... optical pink-up mounting device, 77... pickup mounting member, 78...
Guide part, U...optical pink-up feed mechanism, SO/
...Switch, drive device, 81...Drive section, 82...
-Printed wiring board, 83...first mounting member, 84...
Second mounting member, 85...fixing screw, 86...first
hexagon socket screw, 87... washer, L... focus offset adjustment section, 89... eccentric cam, 90...
・Corrugated washer, 91...first bushing, 92...
・Screw, 93...First adjustment part, 94...Second bushing, 95...Screw, 96...Second hexagon socket screw, 97...Washer, 98... a second adjustment member;
99...Transmission motor, 100...First pulley, 1
01...Belt, 102...Second pulley, 103
... shaft, 104 ... worm, 105 ... screw,
106... Bearing, 107... Worm gear, IO2
... shaft, 109 ... third pulley, 110 ... pink up mounting base, 111 ... spring, 112 ...
...Wire, 113...Fourth pulley, 114...
・Rotation center axis, 115...bearing, II6...E ring, logo...Danno (device, 7zs...case, 1
19...Rotating blade, 120...Blade member, 12
I... Grease, 122... Fitting portion, 123...
Locking part, 124...Locking part, 125...Paper spring, 12
6... Adjustment member, I27... Hook part, 128...
・Screw, 129...Protrusion part, 130...Slope part, 1
31... Drive part, 132... Long hole, 133... Lost element, I34... Locking part, 135... Screw hole, 136
...Through hole, 137...Protrusion, 138...Through hole,
139...Lock bin, 140...Screw part, 141
... Fitting part, I42... Inclined part, 143... Head, I44... E-ring. Representative Patent Attorney Takehiko Suzue Figure 8 (a) Figure 8 (b) 67'/ Figure 10 Figure 10 Figure 11 A Figure 12 Figure 20 Figure 21

Claims (1)

[Claims] an optical pickup that plays back a disc in a linear tracking manner; a pickup mounting member that supports the pickup so as to play back the disc in a linear tracking manner; and a pickup mounting member that is screwed into the pickup mounting member. An optical pickup holding device characterized by comprising a transfer lock screw that fixes the optical pickup in a state shifted from a base position.