JPH0520814B2 - - Google Patents

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 a holding device for an optical pickup.

[Technical background of the invention and its problems]

Recently, in the field of audio equipment, digital recording and playback methods that utilize PCM (pulse coat modulation) technology are being adopted in order to achieve as high fidelity as possible. In other words, this is called digital audio conversion, and the principle is that the audio characteristics are far superior to conventional analog systems without depending on the characteristics of the recording medium. This is because it has been established. 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 playback method is adopted, the playback device that embodies it is still required to be capable of satisfying various advanced functions and performances not found in conventional methods.

For example, among the optical playback methods, the one proposed as the CD (compact disc) method uses an optical disc with a diameter of 12 cm and a thickness of 1.2 mm.
Approximately 200 to 500 r.pm by CLV (constant linear velocity) method
The disc is driven at a variable rotational speed of 1.6 μm, and it is said that the disc has a track pitch of 1.6 μm and can store a huge amount of information, which can be played back in stereo for about an hour on one side. It is also easy to understand.

The above-mentioned disk is made by covering a transparent resin disk with a metal thin film that forms pits (irregularities with different reflectances) corresponding to digital (PCM) data.

For example, in a CD system, one of the requirements is to take measures to protect the optical pickup used to play back the information recorded on the disc. For such optical pickups, there is a risk that the pickup position detection switch that constitutes the pickup drive control system may be damaged due to displacement due to vibrations during transportation, including transportation of the disc playback device. , it is necessary to take measures to protect the switch during transport.

[Purpose of the invention]

This invention was made in view of the above points,
An object of the present invention is to provide an optical pickup holding device which has a simple structure and can securely hold an optical pickup during transportation, thereby realizing reliable protection of a switch for detecting a pickup position.

[Summary of the invention]

That is, the present invention provides an optical pick-up for reproducing a disk in a linear tracking manner, and supporting the pick-up so that the disk can be reproduced in a linear tracking manner.
A pick-up mounting member having a hole, a pick-up position detection switch provided at one end of the movable range of the pick-up and detecting that the pick-up is at a base position, and the pick-up mounting member in a state in which the switch is turned on. A support member is provided with a screw hole corresponding to a position controlled by the hole of the pick-up mounting member, and a fitting portion having an inclined portion inserted into the hole of the pick-up mounting member is provided at a distal end thereof, and a transfer lock screw which fixes the pick-up mounting member at a distance from the position where the switch is turned on by being screwed into the optical pick-up holding device.

[Embodiments of the invention]

(Apparatus to which the Invention is Applied) Hereinafter, an embodiment of the present invention as applied to a CD type optical disc record reproducing apparatus will be described in detail with reference to the drawings. That is,
FIG. 1 shows an external perspective view of an optical disc record playback device using the CD system. This is a so-called kangaroo pocket type that rotates in the direction of arrow B in the figure when operated, and a disk (not shown) is vertically inserted into the pocket and loaded into the drive position for vertical playback. 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, and hereinafter, the loading mechanism section 11 is
A display section 14, a so-called reverse key (REV) for back-forward operation, a first-forward key (FF) for first-forward operation, and a play key (PLAY) for play operation are provided on the upper right side of the screen. Also in the middle row, where the first operation unit 15 is arranged, a second operation unit is provided with a next break key (NEXPL AY), a repeat key (REPEAT), a Bose key (PAUSE), and a stop key (STOP). 16 is arranged. Similarly, in the bottom row, 0,
The third key has number keys 1, 2...9, a memory read key (MREAD), a memory key (MEMORY), and a clear key (CLEAR).
An operating section 17 is arranged.

That is, FIGS. 2 and 3 show the state before and after disk loading, respectively. First, in FIG. 2, 18 is a substantially plate-shaped sub-chassis, and this sub-chassis 18 is connected to a substantially box-shaped main chassis 19.
and are arranged side by side at a predetermined interval, and are connected by extensions 20 and 21 at both ends of the main chassis 19, respectively. And the above sub chassis 1
8, the lower portions of both ends of the front holder 22 are rotatably supported, and the front holder 22 has a lid 23 attached to its front part, and is always biased in the direction of arrow B by a torsion spring (not shown). ing. In addition, the sub chassis 18 and the front holder 2
A rear holder 24 having a substantially U-shaped side surface is provided between the rear holder 2 and the front holder 2, 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, 2
4 are coated with a resin such as polyurethane resin to protect the disks, 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 disks. There is.

Here, an optical pick-up 25 for signal reading supported by a mounting device to be described later is protruded from an opening 181 formed in the sub-chassis 18. The pick-up 25 is supported by the main chassis 19 so as to be slidable in the directions of arrows C and D, and is slidably driven through the opening 181 of the sub-chassis 18 by a pick-up drive mechanism to be described later. A pick-up position detection switch 26 is provided approximately at the center of the upper end of the back surface of the sub-chassis 18.
This switch 26 is turned on by a switch driving device, which will be described later, which is supported at the upper end of the pick-up 26 when the pick-up 25 is located most in the direction of arrow C (base position).

Further, a disk receiver 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 rotated in a predetermined state. A reflective photosensor 28 is provided to detect the presence or absence of. The rotation of the disk receiver 27 is detected by a reflective photosensor 29 provided on the sub-chassis 18 for detecting rotation of the disk receiver.

Furthermore, at one end of the sub-chassis 18,
An eject mechanism 30, which will be described later, is provided.
For example, when the eject operation lever 31 is operated while the power is on, the eject mechanism 30 slides a lock slider 33 in the direction of arrow E via a loading control mechanism 32, which will be described later, to unlock the front holder 22. along with power supply
In the OFF state, the front holder 22 is unlocked by directly operating the lock slider 33. When the lock is released in this way, the front and rear holders 22 and 24 are loaded and opened by a damper mechanism 34 (see FIG. 3) provided on the extension 21 at the other end of the subchassis 18. It is the state and what is done.

That is, in FIG. 3, 35 is a fan-shaped gear formed at the other end of the front holder 22, and this fan-shaped gear 35 is connected to the damper 37 via reduction gears 36 supported by the extensions 21, respectively. It meshes with the supported gear 38. Therefore, the front holder 22 is loaded into the closed state by being pressed in the direction of arrow A, 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 holder 24 is connected to the front holder 22.
The guide shaft 41 planted in the extension part 21 is inserted into the guide shaft 40 of the illustrated shape of the guide part 39 which is arranged in parallel with the fan-shaped gear 35. Then, a predetermined loading is performed. When the front and rear holders 22 and 24 are in the closed state, the disk 45 inserted between the front holder 22 and the rear holder 44 is held in the closed state by the disk clamp mechanism 46 supported by the front holder 22. 27 so that they rotate together.

Here, the above-mentioned optical disc record playback device automatically plays the disc 45 when the lid 23 is closed.
(see FIG. 3) is rotated to, for example, be in a playback standby state. 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 with the contact parts facing toward the lid. It will be established. The movable contact 470 of this switch 47 is opposed to the other end of a drive member 48 whose one end is supported by the front holder 22 and whose upper surface is substantially L-shaped. Therefore, when the lid 23 is closed, the switch 48 is operated by one end of the drive member 48 to connect the movable contact 4.
When 70 is pressed and turned ON and the lid 23 is opened, it is rotated together with the lid 23 and turned OFF. Note that the switch 47 is
The first switch 471 is appropriately connected to a control circuit (not shown), and the second switch 471 is connected to a control circuit (not shown) as appropriate.
72 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 control circuit 49.
connected to the input end of the The other input terminal of this control circuit 49 is connected to the output terminal of the reflective photosensor 28 for detecting the presence or absence of the disk, and the input terminal of the laser APC circuit 50 is connected to the output terminal thereof. The laser APC circuit 50 has its other input terminal connected to a second switch 472 connected to the laser power source 51, and its output terminal connected to the pickup 25.

That is, when the disk 45 (see FIG. 3) is inserted into the holder and the lid 23 is closed as described above, the reflective photosensor 28 outputs a disk presence/absence detection signal (hereinafter referred to as the DSET signal) to the control circuit 49. . At this time, a lid opening/closing detection signal (hereinafter referred to as DLK signal) is sent from the first switch 471.
is output to the control circuit 49. Therefore, from this control circuit 49, to the laser APC circuit 50,
A laser ON-OFF control signal (hereinafter referred to as an 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 (LASEAR). For example, if the disk 45 (see FIG. 3) is not attached and the lid 23 is closed,
Since the DSET signal from the reflective photosensor 28 is not input to the control circuit 49, the pickup 2
No laser is emitted from 5. Also,
When the disk 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 no laser is emitted from the pickup 25. It is.

Furthermore, if the disk 45 (see FIG. 3) is not inserted into the holder and the lid 23 is closed, for example, the reflective photosensor 28 will not output the DSET signal, and the pickup 25 will not emit the laser. It is something that cannot be done.

In this way, a double safety structure is provided in which the laser is emitted from the pickup 25 only when the disk 45 is attached and the lid 3 is closed. Therefore, even if the control circuit 49 or the like breaks down, the laser power source 51 is turned off by the switch 47 that is linked to the opening and closing of the lid 23.
This ensures that erroneous laser emission is prevented.

Next, the loading control mechanism 32 in the operating state of the optical disc record playback device
Let's talk about. That is, as shown in FIG. 4, 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. Among them, the first mounting part 201
The first solenoid plunger 52 is connected to the iron core portion 5.
20 is attached with the lid 23 facing toward the lid. This iron core portion 520 has a first drive member 53
is supported at one end. This first driving member 53
is rotatably supported by the first mounting portion 201 near the iron core portion 520 in the directions of arrows H and I at its intermediate portion, and the other end thereof is rotatable in the directions of arrows J and K. It is supported movably in the directions of arrows L and M by an eject shaft 54 that is rotatably supported.

Here, the eject shaft 54 is formed to protrude from the eject lever 31,
A torsion spring 55 is attached to the tip thereof so as to bias the eject lever 31 in the directions of arrows M and K.

Further, the eject lever 31 has a protrusion 310 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 protrusion 311 for driving a switch, and when the eject lever 31 is operated, the eject lever 31 drives the eject switch 56 provided on the extending portion 20. is being done.

On the other hand, a second solenoid plunger 57 is attached to the second mounting portion 202 of the extension portion 20 on the iron core portion 5.
The iron core portion 570 is attached with the iron core portion 570 facing toward the lid 23, and one end of the second driving member 58 is supported by the iron core portion 570. This second drive section 57 is supported at its intermediate portion by the extension section 20 near 560 of the iron core section 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 3 at the lower end of the lock slider 33.
He is holding 31.

Here, the lock slider 33 has a hook-shaped lock part 332 in the middle part of the front holder 2.
It is formed corresponding to the protrusion 220 at one end of 2. This lock portion 332 is connected to the lid 2.
3 is closed, the protrusion 220 of the front holder 23 is engaged to lock the lid 23 in the closed state.

Next, the operation of the loading control mechanism 32 configured as described above will be explained. In other words, when the lid 23 is closed, the protruding portion 220 of the front holder 22 is locked onto the lock slider 33 as described above.
It is locked by a locking portion 332. Therefore, as shown in FIG. 4, for example, when the power is turned off, when the eject lever 31 is pressed, the lid eject lever 31 resists the spring force of the torsion spring 53 and engages the protrusion 310. The engaged protrusion 330 of the lock slider 33 is pressed to slide the lock slider 31 in the direction of arrow E. On this occasion,
The lid 23 is loaded and opened as described above when the protrusion 220 of the front holder 22 is unlocked by the lock portion 332 of the lock slider 33.

On the other hand, when the power is turned on as shown in FIG. The protrusion 3 of this eject lever 31
10 is in a non-engaged state with the protrusion 330 of the lock slider 33. 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 driving the switch is ejected. Turn on switch 55. Therefore, the eject signal of the eject switch 55 (hereinafter referred to as
An EJECT signal) is input to a control circuit (not shown). Then, this control circuit sends a position detection signal (hereinafter referred to as SL signal) in which the pick-up 25 is returned to the base point and the switch 26 for detecting the pick-up position is turned on, and a reflective photosensor for detecting the rotation of the disk receiver. 29, a stop detection signal (hereinafter referred to as
When the DTAC signal) is input, an eject completion detection signal (hereinafter referred to as the EJCT signal) is output, and the second solenoid plunger 56 is energized for a predetermined period of time, thereby driving the second solenoid plunger 56. Therefore, the iron core portion 560 of the second solenoid plunger 56 rotates the second driving member 58 in the direction of the arrow J, thereby locking the lock slider 3.
3 in the direction of arrow E. Therefore, the lid 23 is loaded into the open state by releasing the locking of the front holder 22 in substantially the same manner.

Here, the electrical circuit of the loading control mechanism 32 will be described. That is, in FIG. 7, 52 is a first solenoid plunger 52, and this first solenoid plunger 52 is connected to a power supply detection circuit 60 via a solenoid drive circuit 59.
It is designed to be driven depending on whether the power is turned on or off.

Further, the ejection switch 56, the laser switch 47, the pick-up 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 the control circuit 49 is connected to the solenoid drive circuit 61. 2nd through
The solenoid plunger 57 is connected to the solenoid plunger 57.

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 60 is not output, so the first solenoid plunger 52 is not driven and the eject lever 31 is turned off as described above. The lid 23 is opened by the pressing operation.

On the other hand, when the power is turned on, the power detection circuit 60 outputs a power detection signal and the first solenoid plunger 52 is driven. Then, when the eject lever 31 is pressed, an EJECT from the eject switch 56 is released.
The signal is input to control circuit 49. Therefore, when the pickup 25 is not at the base position, the control circuit 49 returns it to the base position and outputs the SL signal of the pickup position detection switch 26 and the disk receiver 25.
7 is rotating, a brake (not shown) is applied, and the DTAC signal from the reflective photo sensor 29 is input, and the laser switch 47
When the DLK signal is input, the EJECT signal is output. Then, the solenoid drive circuit 61 to which this EJECT signal is input drives the second solenoid plunger 57 to move the lid 2 as described above.
3 is in the open state.

In this way, when the power is turned off only by pressing the eject lever 31, the lid 2 is mechanically closed.
When the ejection described in step 3 is performed and the power is on, the lid 23 is ejected after the necessary processing is reliably performed via the control circuit 49, etc., and its handling is very simple. This is the result.

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 Figures 2 and 3) That is, Figures 8a and b, Figures 9a and b, and Figures 10a and b show the state in which the disk 45 is inserted into the holder, and the holder is in the direction of arrow A. The state in which the disc 45 has started to rotate and the disc 45 is in the disc holder 27
This shows the loading completion state. Here, the eighth
In Figures a and b, reference numeral 22 denotes the front holder, and a through hole 221 is formed approximately in the center of the front holder 22. 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 rotatable in the directions of arrows N and O. This clamp regulating member 62 is biased in the direction of arrow N by a spring 63, and the intermediate portion of a substantially plate-shaped spring member 64 is supported by a screw 65 on the front surface thereof. 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 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. Furthermore, a pair of substantially parallel pressing portions 640 and 641 are formed at the other end of the spring member 64. One of the pressing parts 640 faces the arm part 240 formed on the rear holder 24, and the other pressing part 641 faces the arm part 180 formed on the sub-chassis 18.

Here, the operation of the disk clamp mechanism 46 configured as described above will be described. First, the 8th
In the state where the disk 45 as shown in FIGS.
180, the clamp portion 66 is rotated most in the direction of arrow N 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. At this time, the disk 45 is supported at its peripheral edge by a disk position regulating device 67, which will be described later, and by the front holder 22 at one side thereof.

Next, as shown in FIGS. 9a and 9b, when the front holder 22 is pressed in the direction of arrow A, the damper mechanism 34 described above is reversed and the front holder 22 is rotated in the direction of arrow A. . At this time, rear holder 2
4 is rotated in the direction of arrow A while being slid in the direction of the disk receiver 27 because the guide shaft 41 is inserted into the guide groove 40 of the guide portion 39. 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 connected to the front and rear holders 2.
2 and 24 are rotated, the arm portion 2 of the rear holder 24 is pressed against one pressing portion 640 of the spring member 64.
40 is brought into contact and pressed, and is rotated in the direction of arrow 0. Therefore, the clamp portion 6 of the spring member 64
0 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 arrow A, the front holder 22 is locked in the closed position by the lock portion 332 of the lock slider 33, as shown in FIGS. 10a and 10b.
At this time, the spring member 64 is
1 is pressed by the arm portion 180 of the sub-chassis 18, the clamp portion 66 protrudes from the through hole 221 of the front holder 22 and is fitted into the fitting portion 270 of the disk receiver 27 via the disk 45, At this point, the mounting of the disk 45 is completed.

Here, one pressing portion 64 of the spring member 66
0 protects the disc 45 by its spring force when the clamp part 66 presses too much, and when the disc 45 does not require protection, the spring force does not affect either of them. It is something.

In addition, when taking out the disk 45, the disk clamp mechanism 46 performs the reverse operation of the loading operation described above by operating the eject lever 31 (see FIG. 4) as described above, making it easy to take out the disk 45. Therefore, its explanation will be omitted here.

In this way, the clamp portion 66 against which the disk 45 is pressed is configured to be housed inside the front holder 22. Therefore, the clamp portion 66 does not get in the way when the disk 45 is attached or detached, and the disk 45 can be attached or detached very easily.

Here, the disk position regulating device 67 which regulates 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 show the state in which the disk 45 is inserted into the holder portion and the state in which the disk 45 is inserted, respectively.
This shows the state in which the disk holder 27 has been completely loaded. Here, in FIG. 11, reference numeral 45 denotes the disk, and the peripheral edge of this disk 45 is directed by a disk position regulating member 68 provided at the lower end of the front holder 22. As shown in FIG. This disk position regulating member 68 is formed in a substantially U-shape.
Arm portions 69 and 70 supporting the peripheral edge of the disk 45 are formed at both ends thereof. Approximately V-shaped holding portions 695, 700 are formed at the intermediate portions of the upper ends of these arm portions 69, 70, respectively, and the disk 45 is held approximately vertically while being in contact with these holding portions 690, 700. It is loaded into the state. Further, the disk position regulating member 68 is provided with a rotation shaft 71 whose both ends are fixed to the intermediate portion of the arm portions 69 and 70.
The rotation shaft 71 is rotatably supported at the lower end of the front holder 22.

Here, the disk position regulating member 68 has a torsion spring (not shown) engaged with the rotating shaft 71 so as to apply a spring force in the direction of arrow B, so that the lower end of the bottom thereof is connected to the front holder 22.
It is configured to be locked by a locking portion 222 formed in the. 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 disk position regulating member 68. By adjusting the adjusting member 72, 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 holder 24 with the lid 23 in the open state as described above, the disk 45 is moved by its own weight to the arm of the disk position regulating member 68, as shown in FIG. It is supported by parts 69 and 70. 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 the arrow A, the disc 45 is moved to the front holder 2 while its inclination angle is regulated by the holding parts 690, 700 of the disc position regulating member 68.
2 so that the hole of the disk 45 faces 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 lock mechanism as described above, and the disk 45 is pressed against the disk receiver 27 by the disk clamp mechanism 46 described above. It is. 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 arm portion 69 of the disk position regulating member 68,
70 is detached from the peripheral edge of the disk 42 by the torsion spring of the rotating shaft 71.

Further, when the above-mentioned eject lever 31 (see FIG. 4) is operated to take out the loaded disk 45, the above-mentioned disk position regulating device operates almost in the opposite direction to the loading operation.
The explanation of its operation will be omitted here.

In this way, the disk 45 is regulated by the disk position regulating member 68 from the state in which the lid 23 is opened until it is pressed into contact with the disk receiver 27 by the disk clamp mechanism 46. Therefore, the disk 45 does not make rattling noises or dances due to changes in the angle of inclination, and its protection is ensured.

Here, protection means formed on the front and rear holders 22 and 24 for the disk 45 to be inserted will be described. (See Figure 2)
That is, in FIG. 13, 73 is a member made of, for example, synthetic resin that forms the front and rear holders 22, 24, and the surface portion of this member 73 is coated with a material having appropriate elasticity, for example, 20 to 60 μm. A two-component polyurethane resin paint 75 mainly composed of, for example, urethane beads 74 foamed into a spherical shape is applied.

Therefore, when attaching and detaching the disk 45 (see FIG. 3) between the front holder 22 and the rear holder 24,
For example, the disk 45 is attached to the front and rear holders 2.
2 and 24, the urethane beads 74 of the polyurethane resin paint 75 are crushed by the disk 45.

Therefore, the disk 45 is protected by the urethane beads 74 of the polyurethane resin paint 75 and is prevented from being scratched.

Here, 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 may be adjusted as necessary.

Next, referring to the disk drive and playback mechanism section, FIG. 14 shows the main chassis 19.
This figure shows a disk drive and playback mechanism constructed between the sub-chassis 18 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 76, which will be described in detail later, with the lens portion 250 corresponding to the disk holder 27. It is disposed in an opening 181 of the sub-chassis 18. The pick-up 25 is connected to a pair of guide portions 7 arranged vertically and vertically on the main chassis 19 at its back side via the pick-up mounting member 77.
8 and 78, and is supported at its lower end so as to be slidable in the directions of arrows P and Q by an optical pick-up feed mechanism 79, the details of which will be described later.

Further, at the upper end of the pickup mounting member 77, a switch drive device 80, the details of which will be described later, is provided. This switch drive device 80 has a drive section 81 facing the operating section 261 of the switch 26 for detecting the pick-up position, and reaches the sliding base position of the pick-up 25 (the inner peripheral part of the disk to be loaded). With the above switch 2
6.

Here, at the lower end of the sub-chassis 18,
A pick-up holding device (not shown), which will be described later, is provided, and the pick-up holding device is used to fix the pick-up 25 to the sub-chassis 18, for example, when transporting the DAD playback device.

Now, referring to the pick-up mounting device 76 that adjusts the angle of the pick-up 25, FIGS. 15 and 16 a, b, c, and d show the entire pick-up mounting device 76, one side of the pick-up mounting device 76,
It shows a front part, an upper part, and a lower part.

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

That is, in FIG. 15, reference numeral 25 denotes a pick-up having a substantially rectangular parallelepiped shape. This pick-up 25 has a lens portion 250 formed at the lower front surface thereof, and a printing arrangement for controlling the pick-up 25 on one side thereof. A mounting plate 82 is provided. and,
A substantially U-shaped second mounting member 84 is provided on one side of the pick-up 25 via a substantially plate-shaped first mounting member 83 so as to surround the lower and upper surfaces of the pick-up 25. These first and second
The mounting members 83 and 84 are attached to the pick-up 25.
It is screwed onto the lower part of one side with a fixing screw 85. Of these, the second mounting member 84 has a long hole 8 at a position corresponding to the upper part of one side of the pick-up 25.
40 is formed, and a first hexagon socket screw 86 is inserted into this elongated hole 840 via a washer 87 to connect the first mounting member 83 and the pick-up 25.
are screwed together.

In addition, the first and second mounting members 83, 84
Through holes 830 and 841 are formed corresponding to the printed wiring board 82 of the pickup 25, and
A focus set adjusting section 88 shown in FIG. 17 is formed near the bottom of the through holes 830, 841.
In this focus set adjustment section 88, an eccentric cam 89 for adjustment is inserted into a through hole 842 formed in the second mounting member 84 via a corrugated washer 90, and this eccentric cam 89 is inserted into the first bush 91.
The first mounting member 83 is attached by screws 92 through
and is screwed onto the pick-up 25.

Here, the first and second mounting members 83, 8
A first adjustment portion 93 for adjusting the pick-up 25 in the directions of arrows R and S (track groove direction) is formed near the first hexagon socket screw 86 at the upper end of the pickup 25. By operating the section 93, the pick-up 25 is rotated together with the first mounting member 83 about the first bush 91 as a rotation axis, and adjustments are made.

Further, the pick-up 25 is provided with a substantially U-shaped pick-up mounting member 77 on the back surface thereof. Both ends of the pick-up mounting member 77 are respectively placed on both ends of the second mounting member 84, and both ends of the pick-up mounting member 77 are placed on both ends of the second mounting member 84.
As shown in FIG. 18, a screw 95 is screwed onto the second mounting member 84 through a second bushing 94 substantially perpendicularly to the lens portion 250 of the lens portion 250 . Furthermore, a long hole 770 is provided at the upper end of the pick-up mounting member 77.
A second hexagonal socket screw 96 is inserted into this elongated hole 770 via a washer 97 and screwed onto the second mounting member 84.

Furthermore, the pick-up mounting member 77 and the second
The arrow V of the pick-up 25 is located near the second hexagon socket screw 96 at the upper end of the mounting member 84.
A second adjustment section 98 is formed to perform adjustment in the W direction (radial tracking direction).

Here, the operation of the pick-up mounting device 76 constructed as described above will be described. That is,
To adjust the focus offset of the pickup 25, that is, in the directions of the arrows X and Y, first loosen the first hexagon socket screw 86 and the fixing screw 85. Then, the screw 92 of the focus offset adjustment section 88
When rotated with a screwdriver (not shown), the eccentric cam 89 is rotated, and the pick-up 25 is moved together with the first mounting member 83 in the direction of the arrow X or Y, thereby adjusting a predetermined focus offset. It is.

Also, when adjusting the arrow R and S directions (track groove direction) of the pick-up 25, use the first hexagon socket screw 8 in the same way as the focus offset adjustment.
6 and fixing screw 85. Then, when a screwdriver, for example, is inserted into the first adjustment part 93 and pressed in a predetermined direction, the pick-up 25 is rotated in the direction of arrow R or S about the first bush 92 together with the first mounting member 83 in the direction of the track groove. Adjustments will be made.

Furthermore, when adjusting the direction of arrows V and W (radial tracking direction) of the pickup 25, loosen the second hexagon socket screw 96. When, for example, a screwdriver is inserted into the second adjustment part 98 and pressed in a predetermined direction, the pick-up 25
is an arrow V or W with the second bushing 94 as the center along with the first and second mounting members 83 and 84.
It is rotated to adjust 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 tightened in a state where each adjustment is completed, and the adjustment position is It is designed to lock.

Note that the adjustment of the focus offset of the pick-up 25 and the adjustment of the track groove direction as described above are as follows.
First hexagon socket screw 86 and fixing screw 8, respectively.
5, by first setting the focus offset and then setting the track groove direction, the corrugated washer provided between the eccentric cam 89 and the second mounting member 84 can be adjusted. 9
The position of the focus offset, once set, is not changed due to the overwhelming effect of zero.

By configuring the pick-up mounting device 76 in this manner, the focus offset, adjustment in the track groove direction, and adjustment in the radial tracking direction of the pick-up 25 can be easily and reliably adjusted.

Next, referring to the pick-up feed mechanism 79 , FIG. 19 shows the pick-up feed mechanism 79 of FIG. 14 taken out.

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

That is, in FIG. 19, 99 is a feed motor provided on the back side of the sub-chassis 18 (see FIG. 14), and the shaft of this feed motor 99 has a
The first pulley 100 is fitted. One side of a substantially loop-shaped belt 101 is wound around the first pulley 100, and the other side of the belt 101 is wound around the second pulley 100.
A pulley 102 is wound around the pulley 102. A shaft 103 is fitted into the rotation center of the second pulley 102, and a worm 104 is fixed to the shaft 103 by a screw 105. The shaft 104 is supported by a substantially U-shaped bearing 106 so as to sandwich the worm 104, and this bearing 106 is supported by the sub-chassis 18 (see FIG. 14).

Further, the worm 104 is connected to the worm gear 10
The worm gear 107 is rotatably supported by a shaft 108 fitted to the sub-chassis 18 (see FIG. 14), and a third pulley 109 is integrally formed at one end of the worm gear 107. There is. This third pulley 109 has one part of a substantially loop-shaped wire 112 with a pick-up mount 110 and a spring 111 in the middle part.
The wire 112 is wound 1.5 times, and the other end of the wire 112 is wound around the fourth pulley 113. 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) using an E-ring 116, and the other end shown in FIG. It is supported by a damper device 117 shown.

Here, as shown in FIG.
The blade member 120 having the shape shown in 9 is grease 121.
This rotary plate 119 is enclosed with
A connecting portion 122 that protrudes in a substantially ring shape is formed at the tip. And this rotating plate 11
9 has a central rotation shaft 114 of the fourth pulley 113 fitted into its center, and a fitting portion 122 thereof fitted to the other surface of the fourth pulley 113.

Further, the case 118 has a spring locking protrusion 123 formed at one end, and a rotation prevention protrusion 124 at the other end. The spring 125 is locked to the sub-chassis 18 (see FIG. 14), and a locking portion (not shown) formed on the sub-chassis 18 (see FIG. 14) is locked, respectively. Therefore, the case 118 is the fourth case.
The rotation of the pulley 113 is stopped at the illustrated position.

The pick-up mounting base 110 has a pick-up 25 attached to the pick-up mounting member 77 as shown in the dashed double-dashed line in FIG. 19 as described above.
is fixed.

The operation of the pick-up feed mechanism 79 constructed as described above will now 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 belt 101 causes the second
Since the third pulley 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. For this reason, pick up 2
5 is moved in the direction of arrow P together with the pick-up mount 110 by a wire 112.

By the way, the wire 119 wound 1.5 times around the third pulley 109 is maintained at a predetermined tension by the spring 111.
It is moved in response to the rotation of the pulley 109.

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

Here, in the pick-up feeding mechanism 79, if an impact force is applied to the pick-up 25 from the outside, for example, the impact force will be applied to the wire 11.
The signal is transmitted to the second and fourth pulleys 113. Therefore, the impact force is absorbed by the viscous resistance of the blade member 120 of the rotary plate 119 of the damper device 117 and the grease 121, and the influence of the impact force is minimized.

By the way, conventionally, in the pick-up feeding mechanism, when an impact force is applied to the pick-up 25 from the outside, the impact force is transmitted to the wire 112 via the pick-up mounting base 110, causing a collision between the worm 104 and the worm gear 107, and causing an impact. The power was accelerating. However, by providing the damper device 117 in the pick-up feed mechanism 79 in this way, the impact force from the outside is absorbed by the damper device 117.
7, the impact force is accelerated and is not transmitted to the pickup 25.

Next, the switch driving device 80 (see FIG. 14) for driving the pick-up position detection switch 26 will be described. FIG. 21 shows the switch driving device 80 of FIG. 14 taken out.

That is, in FIG. 21, reference numeral 77 denotes a pickup mounting member on which the first half of the pickup 25 is supported. At the upper end of this pickup mounting member 77, there is a substantially plate-shaped adjustment member 126 whose side surface is substantially L-shaped. A hook portion 127 formed at one end is engaged with a through hole 770 of the pick-up mounting member 77 by a screw 128.

The adjustment member 126 is made of an elastic metal material, for example, and has a substantially L-shaped protrusion 129 in the middle of one end thereof, and the tip thereof is parallel to 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 . is formed. An adjustment screw 133 is inserted into the elongated hole 132 and is screwed into the protrusion 129. Depending on how tightly the adjustment screw 133 is tightened, the drive portion 131
The inclination angle of the inclined portion 130 is adjusted.

That is, the drive unit 131 of the adjusting member 129 attached to the pick-up mounting member 77 is configured to move the pick-up 25 to the above-mentioned reference point position (the inner periphery of the loaded disc) with respect to the switch 26 for detecting the pick-up position (see FIG. 14). The adjustment screw 133 is operated so that the drive section 131 drives the switch 26 when the switch 26 is located at the switch 26.

By integrally forming the driving section 131 and the adjusting member 126 in this way, fine adjustment can be performed more easily than when the driving section 131 and the adjusting member 126 are formed separately, and the number of parts is reduced. Become,
Moreover, workability is improved.

Note that in the switch driving device 180, the switch 26 for detecting the pick-up position is
It is possible to drive not only a photoelectric switch but also a photoelectric switch, a reed switch, etc. For example, a reed switch can be easily driven by forming a magnet part in the driving part 131.

(One Embodiment) Next, the pick-up 25 whose drive is controlled as described above is held at a position where it does not come into contact with the earlier switch 16 which is deviated from the base position (inner peripheral direction of the disk to be loaded) during transfer including transportation. A pickup holding device according to an embodiment of the present invention will be described in detail with reference to FIG. 22. That is, FIGS. 22a and 22b show the pickup 25 before and after the fixation, respectively.
9 (in Fig. 2, the first
A locking portion 134 is formed so as to protrude in the direction (see FIG. 4). A screw hole 135 is formed in the locking portion 134, and a protrusion 1 having a through hole 136 on the back surface of the sub chassis 18 corresponds to the screw hole 135.
37 is formed. This through hole 136 is the screw hole 13
It is formed to have approximately the same diameter as the effective diameter of No. 5.

At the lower end of the pick-up mounting member 77 to which the pick-up 25 is attached, there is a through hole 1 corresponding to the switch 26 for detecting the pick-up position.
38 is formed to have approximately the same diameter as the through hole 136 of the protrusion 137. Here, this through hole 138 is slightly larger than the through hole 136 of the protrusion 137 when the pick-up position detection switch 26 is driven by the switch drive loading 80 .
It is formed so that it can be placed in six directions.

Further, a screw portion 140 is formed in the middle portion of the lock pin 139 for fixing the pick-up 25 near the base position (inner circumferential direction of the disk to be loaded) corresponding to the screw hole 135 of the sub-chassis 18. A fitting portion 141 is formed on the lock pin 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 pick-up mounting member 77. , a sloped portion 142 for insertion is formed at its tip. Here, the length from the other end of the threaded portion 140 of the lock pin 139 to the base end is formed to be approximately the same as the effective diameter of the threaded portion 140, and the base end has a parallel head 14, for example.
3 is formed.

That is, when holding the pick-up 25 at the base position of the pick-up 25 shown in FIG. 136, screw the threaded portion 140 together, and tighten. Then, the lock pin 139 has an inclined portion 142 at its tip.
As a result, the fitting portion 141 is inserted and fitted into the through hole 138 of the pick-up mounting member 77 with a slight deviation. Therefore, the pick-up mounting member 77
As shown in FIG. 2B, the switch driving section 131 is moved in the direction of the arrow Y and is separated from the operating section 260 of the pick-up position detecting switch 26.

Here, the lock pin 139 is held in the sub-chassis 18 at that position using, for example, a tightening E-ring 144 to prevent it from coming off.

In this way, the pick-up 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 pick-up position. For this reason, the switch 26 is protected, for example, during the transfer state.

Here, in the above-mentioned pick-up holding device, the switch 26 for detecting the pick-up position is arranged on the opposite side of the pick-up mounting member 77, but the switch 26 is not limited to this, but it may be arranged on the same side as it is equally effective. .

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 present invention, an optical pick-up that can securely hold the optical pick-up during transportation with a simple configuration and realize reliable protection of the pick-up position detection switch is provided. A retention device can be provided.

[Brief explanation of the drawing]

Figure 1 shows a CD-type DAD to which this invention is applied.
FIG. 2 is a side perspective view showing the loading mechanism shown in FIG. 1 taken out;
Figure 3 is a side perspective view showing details of Figure 2;
The figure is a detailed perspective view showing the pick-up safety device and loading control mechanism of Figure 2, and Figure 5 is a detailed perspective view of the pick-up safety device and loading control mechanism of Figure 4.
6 is a detailed perspective view showing the operation of FIG. 4, and FIG. 7 is a block diagram showing the electrical circuit of the loading control mechanism shown in FIG. 4. The configuration diagram, FIGS. 8a and 8b, is a side and front view showing the disk clamp mechanism of FIG. 3, and FIGS. 9a, b, and 10, respectively.
Figures a and b are side and front views showing the middle and rear parts of the clamp in Figures 8a and b, respectively, and Figure 11 is the third
Side view showing the disk position regulating device in Figure 12.
The figure is a side view showing the disk after being clamped in Fig. 11, Fig. 13 is a partial sectional view showing the holder part in Fig. 2, and Fig. 14 is a side view showing the disk drive part and playback mechanism part shown in Fig. 1 taken out. Side perspective view shown in Figure 15
14 is a perspective view of the optical pick-up mounting device shown in FIG. 14; FIGS. 16 a, b, c, and d are side, front, top, and bottom views of the optical pick-up mounting device shown in FIG. 15, respectively; 17 is a cross-sectional view showing details of the focus offset adjustment section shown in FIG. 15, FIG. 18 is a cross-sectional view showing details of mounting the pick-up mounting member shown in FIG. 15, and FIG.
Perspective view showing the pick-up feed mechanism in Figure 20.
The figure is a partial sectional view showing the damper device of FIG. 19,
21 is a perspective view showing the switch driving device of FIG. 14, FIG. 22a is a sectional view showing a pick-up holding device according to an embodiment of the invention, and FIG. 22b
FIG. 22 is a sectional view showing the holding state of FIG. 22a. 10... Cabinet, 11... Loading mechanism section, 12... Eject key, 13...
POWER key, 14...Display section, 15...First operation section, 16...Second operation section, 17...Third operation section, 18...Sub chassis, 190...Main chassis, 20, 21... ...Extending portion, 22...Front holder, 23...Lid, 24...Rear holder, 2
5... Pick-up, 26... Switch for detecting pick-up position, 27... Disk holder, 28
... Reflective photo sensor, 29 ... Reflective photo sensor, 30 ... 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 ... Disk, 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 driving 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, 6
DESCRIPTION OF SYMBOLS 1... Solenoid drive circuit, 62... Clamp regulating member, 63... Spring, 64... Spring member, 65
...Screw, 66...Clamp part, 67 ...Disk position regulating device, 68...Disc position regulating member, 69, 70...Arm part, 71...Rotation shaft,
72... Adjustment member, 73... Member, 74... Urethane beads, 75... Polyurethane resin paint, 7
6... Optical pick-up mounting device, 77... Pick-up mounting member, 78... Guide portion, 79 ...
Optical pick-up feeding mechanism, 80 ...Switch drive device, 81...Drive unit, 82...Printed wiring board, 83...First mounting member, 84...Second mounting member, 85...Fixing screw, 86...First hexagon socket screw, 87...Washer, 88 ...Focus offset adjustment section, 89...Eccentric cam, 90...
... Waveform washers, 91 ... First washers, 92
...Screw, 93...First adjustment section, 94...Second
Bush, 95... Screw, 96... Second hexagon socket screw, 97... Washer, 98... Second adjustment member, 99... Feed motor, 100... First pulley, 101... Belt, 102... Second pulley, 103... Shaft, 104... Worm, 10
5... Screw, 106... Bearing, 107... Worm gear, 108... Shaft, 109... Third pulley, 110... Pick-up mounting base, 111...
Spring, 112...Wire, 113...Fourth pulley, 114...Rotation center shaft, 115...
Bearing, 116... E-ring, 117 ... Damper device, 118... Case, 119... Rotating blade, 120... Vane member, 121... Grease,
122... Fitting part, 123... Locking part, 124...
... Locking part, 125 ... Spring, 126 ... Adjustment member, 127 ... Hook part, 128 ... Screw, 12
9... Protrusion part, 130... Inclined part, 131... Drive part, 132... Long hole, 133... Screw, 134
...Locking part, 135...Screw hole, 136...Through hole, 137...Protrusion part, 138...Thread hole, 139
...Lock pin, 140...Screw part, 141...
Fitting part, 142... Inclined part, 143... Head, 1
44...E ring.

Claims (1)

[Scope of Claims] 1. An optical pick-up for reproducing a disk in a linear tracking manner, and a pick-up mounting having a hole for supporting the pick-up so that the disk can be reproduced in a linear tracking manner. a pick-up position detection switch that is provided at one end of the movable range of the pick-up and detects that the pick-up is at a base position; A support member is provided with a corresponding screw hole, and a fitting portion having an inclined portion at the tip thereof to be inserted into the hole of the pick-up mounting member is provided, and by screwing into the screw hole of the support member. An optical pick-up holding device comprising a transfer lock screw for fixing the pick-up mounting member at a distance from a position where the switch is turned on.