JPH02189722A - Optical disk reproducing device - Google Patents

Abstract

PURPOSE:To improve the reliability because of a simplified mechanism, to save the space and to reduce the cost by using one motor so as to apply clamping by a clamper of an optical disk and the tilt adjustment making the optical axis of the optical pickup and an optical disk face orthogonal to each other. CONSTITUTION:A tilt cam 15c is formed to a lock member locking an elevating descending cam member elevating and descending a clamper clamping an optical disk (b) to its elevating and descending end position. Then tilt adjustment is applied by driving again the lock member by making a contact piece 23b of a mount member with an optical pickup 20 mounted thereupon for straightforward motion in contact with the cam by energizing. Since the clamping and the tilt adjustment of the optical disk (b) are attained by the drive member, one drive motor is enough for the adjustment. Thus, the mechanism is simplified, number of components is reduced, the space is saved, the cost is decreased and the reliability is improved.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to an optical disc reproducing apparatus for reproducing signals recorded on an optical disc such as an optical video disc or a digital audio disc. The present invention relates to a tilting means for clamping the optical disk between a turntable and a clamper, for aligning a moving straight line of an optical pickup for reading signals with respect to the clamped optical disk, and for making the optical axis perpendicular to the clamped optical disk. It is something.

[Conventional technology]

In the conventional optical disc reproducing apparatus equipped with the above-mentioned optical disc clamp and optical pickup tilting means, each of them is operated by an independent drive device.

That is, a disc loading mechanism that pulls an optical disc into the playback device, sets it on a turntable, and clamps it with a clamper, and keeps the optical axis of the optical pickup always perpendicular to the warping of the optical disc. The tilt mechanism is driven by a separate motor.

[Problem to be solved by the invention]

In the conventional optical disc playback device described above, two motors are required for this purpose.

After the optical disk is clamped by the clamp, a locking mechanism is required to hold the clamper in that position.

This not only complicates the mechanism, increases the risk of failure, and lowers the reliability of the bank, but also has drawbacks such as a decrease in space factor due to the two motors and their mechanisms.

[Purpose of the invention]

The present invention is intended to solve the above-mentioned problems in conventional optical disc playback devices, and uses a single motor to clamp an optical disc by a clamper and to connect the optical axis of an optical pickup to the optical disc surface. The purpose is to perform orthogonal tilt adjustment, improve cheek confidence, save space, and reduce costs by simplifying the mechanism.

[Summary of the invention]

The present invention relates to an optical disc playback device for achieving the above-mentioned object, and in which a tilt cam is formed in a locking member that locks an elevating cam member that raises and lowers a clamper that clamps an optical disc at the end position of the elevating cam member. The contact piece of the mounting member on which the optical pickup is mounted and moves linearly is brought into contact with the mounting member by force, and the tilt adjustment is performed by re-driving the locking member.

〔Example〕

Next, an example of the implementation of the present invention will be described with a diameter of 30 cm and a 20C1
An optical disc reproducing apparatus capable of reproducing any of 1, 12CI, and 8C11 optical discs will be described below.

In FIG. 5, reference numeral 1 denotes a motor attached to a chassis a. A cam gear 3 meshes with a gear 2 rotated by the motor 1 via a speed reduction mechanism, and meshes with a partially toothed gear 4 integrated with the cam gear 3. A vertically long gear 5 having vertically carved teeth is driven by the interlocking gear.

In FIG. 6(a), reference numeral 6 denotes a slide plate that is supported movably only in the left and right directions on the chassis a, and an elevating plate that is supported on the chassis a so as to be movable only in the vertical direction is provided in the cam hole 6a of the slide plate. No. 7 pin 7a is inserted.

Therefore, when the slide plate 6 slides in the left-right direction, the pin 7a is guided to the cam hole 6a, and the elevating plate 7 moves up and down.

As shown in FIG. 3, this elevating plate 7 includes two rollers 8A and 8B that are pivoted in the horizontal direction, and two rollers that are pivoted in the vertical direction at the same position in the front and back direction as these rollers 8A and 8B. Two rollers 9A and 9B are attached.

The rollers 8A and 8B have a guide groove 10a formed on one side of the tray 10 on which the optical disc b is placed as shown in FIGS. The guide groove 10b on the bottom is fitted.

Therefore, the tray 10 has its guide groove 10a.

10b is guided by rollers 8A, 8B, 9A, and 9B, and can move in the front-back direction in FIG. 4 with respect to the elevating plate 7.

On the other side of this tray 10, there are
) is provided with a guide groove 10c that opens upward at one end, and this guide groove 10c is provided with a chassis a.
A roller 13A, which is supported horizontally, is inserted into a roller 11, which is supported horizontally.

Therefore, the tip of the arm plate 13 is in the raised position and the roller 1
When trays 1 and 13A are in the same horizontal position, the tray 10 is movable in the horizontal direction in FIG. 4, as described above.

Then, when the tray 10 moves to the end and the roller 11 and the upper opening of one end of the guide groove 10c are aligned, and the arm plate 13 rotates about the shaft 12, the roller 11 moves from the upper opening of the guide groove 10c. It is removed and the tray 10 can be lowered.

A pin 13b is provided upright on the arm plate 13 and inserted into the connecting hole 7b of the elevating plate 7, and as the elevating plate 7 moves up and down, the arm plate 13 is rotated.

Further, as shown in FIG. 4, the vertically elongated gear 5 is rotatably attached to a shaft 7c provided on the elevating plate 7, and is supported by the shaft 14 of the chassis a and the shaft 7d, while the elongated gear 5 is raised and lowered. do.

Therefore, the longitudinal gear 5 does not come out of engagement with the gear that drives it even when the elevating plate 7 goes up and down, and always meshes with the rack 10d of the tray 10 that goes up and down together with the elevating plate 7.

Further, as shown in FIG. 5, a 7-shaped groove 60 is bored in the arm portion 6b of the slide plate 6, and the pin 3a protruding from the top surface of the cam gear 3 is inserted into the 7-shaped enlarged tip of the groove 6C. Kara groove 6
After entering the slot 60 and moving the slide plate 6 by pushing the groove 6C, the puller exits from the enlarged 7-shaped tip of the groove 60.

On the upper surface of the cam gear 3, there are two arcuate portions 3b+ -3bt centered on the center thereof, and the arcuate portions 3b+ and 3bt.
A cam groove 3b is formed, which is made up of a cam portion 3b1 connecting the two, and a cam portion 3b extending toward the outer diameter side from the arcuate portion 3bz.

The pin 16A, the guide groove 16B, and the guide hole 15a of the chassis a are guided, and the pin 15b protruding from the lower surface of the locking plate 15 that moves linearly is guided by the cam groove 3b.
is inserted into.

Therefore, when the pin 15b is in the arcuate portion 3bl of the cam groove 3b, the locking plate 15 does not move even if the cam gear 3 rotates, but when the pin 15b reaches the cam portion 3bs, the locking plate 15 is moved to the right in FIG. 5 as the cam gear 3 rotates.

Next, when the pin 15b reaches the arcuate portion 3bz, the locking plate 15 does not move even if the cam gear 3 rotates, and when it reaches the cam portion 3b4, the locking plate 15 moves to the left again, and the cam portion It reaches the end of 3b4.

In this way, when the pin 15b is at the end of the arcuate portion 3b+ and the cam portion 3b4 and the locking plate 15 is moving to the left, the tip thereof is as shown in FIGS. 8 and 10. It comes into contact with the end surface of the arm portion 6b of the slide plate 6 to prevent the slide plate from sliding.

When the pin 15b is in the arcuate portion 3bz and the locking plate 15 is moving to the right as shown in FIG. 9, the prevention of movement of the arm portion 6b is released.

At this time, the pin 3a of the cam gear 3 enters the groove 6C,
This is pressed to slide the slide plate 6.

Note that a tension spring 17 is provided between the locking plate 15 and the guide portion 16B.
is installed, urging the locking plate 15 to the right in FIG.

Further, as shown in FIGS. 13 to 15, a guide shaft 22 for guiding a mounting body 21 of an optical pickup 20 is attached to a shaft 19 supported by two shaft bearings 18 whose upper surface is open. Two bearings 23a of the attached support plate 23 are supported on the outside of the bearing 18.

Therefore, after inserting the shaft 19 into the bearing 23a, if the shaft 19 is inserted into the bearing 18 from above, the support plate 23 will be pivotally supported by the chassis a, and the stop plate 55 that fixes the upper surface of the shaft 19 will be attached to the screw 56.
If the shaft 19 is fixed to the chassis a, the shaft 19 will be prevented from coming off.

If this screw 56 is removed and the stop plate 55 is removed, the support plate 23
and the parts attached thereto can be removed from the chassis a.

A push spring 24 is mounted between the bearing 18.23a and urges the support plate 23 upward in FIG.

In addition, an example of the support plate 23 has a tension spring 25 installed between it and the chassis a, and urges that side of the support plate 23 downward, so that the support plate 23 is centered around the axle load 9. as tension spring 25
It is designed to be able to move in a seesaw pattern against the wind.

A contact piece 23b is attached to one end of the downwardly biased side of the support plate 23, and the contact piece 23b
Due to the biasing force of the tension spring 25, the locking plate 15 is pressed against the push-up cam 15c as shown in FIG.

Therefore, as the locking plate 15 moves, the support plate 23 moves like a seesaw as described above. Here, the push-up cam 15
As shown in FIG. 5 0)), c is composed of an inclined portion 15c+, a horizontal portion 15ct, and an inclined portion 15C1. especially,
The height of the horizontal portion 15C2 is such that the support plate 23 is leveled.

A motor 26 is attached to the support plate 23, and the rack 21a of the mounting body 21 meshes with a gear 27 driven by a pulley 26a of the motor 26 via an interlocking mechanism. 21 is guided by a guide shaft 22 and moves linearly.

Furthermore, a shaft 28a of a rotating plate 28 is rotatably mounted on the support plate 23 as shown in FIG. 16, and a long hole 28b of the rotating plate 28 is fixed to the support plate 23 with a screw 23c. By doing so, rotation of the rotating plate 280 is prevented.

A recess 28c is provided at the tip of the rotating plate 28, and a projecting piece 29 of the rotating piece 29 rotatably attached to the support plate 23
a is inserted into this recess 28c.

Therefore, if you loosen the screw 23c and rotate the rotating piece 29,
The recess 28c is pushed by the projection 29a to rotate the rotary plate 28, and the rotary plate 28 is fixed at that position by tightening the screw 23c.

A protrusion 28d is formed on the other end of the rotating plate 28, and the protrusion 28d is in contact with a contact piece 30 fixed to the chassis a by the bias of the push spring 24.

Therefore, when the rotating plate 28 rotates to the imaginary line in the figure as described above, the support plate 23 is moved to the position indicated by the imaginary line against the bias of the push spring 24.

In this way, the support plate 23 can be adjusted so that the optical axis of the optical pickup 20 moves on the center line of the turntable 32 attached to the spindle motor 31.

On the other hand, as shown in FIGS. 17 to 20, one side 23 of the support plate 23
A recess 33b is provided on the upper surface of the auxiliary mounting plate 33 to which a slide piece 33a that slides along the direction d is attached, and a screw 33c provided upright on the auxiliary mounting plate 33 and the mounting body 21 are provided with a recess 33b.
The recess 33b is pressed against the protrusion 21b protruding from the lower surface of the mounting body 21 by the urging force of the push spring 34 installed between the recess 33b and the recess 33b.

Therefore, the auxiliary mounting plate 33 can move in a seesaw manner against the push spring 34, centering on the contact point between the protrusion 21b and the recess 33b.

A screw 33d is screwed into the auxiliary mounting plate 33 through the mounting body 21.

Therefore, if this screw 33d is tightened, the auxiliary mounting plate 3
3 compresses the push spring 34 as described above, rotates as shown in FIG. 19, and lifts this side of the mounting body 21.

On the other hand, if you loosen the screw 33d, the push spring 3
4, the mounting plate 33 rotates in the opposite direction, and the mounting body 21
This side will go down.

Therefore, the mounting body 21 rotates about the guide shaft 22 in the direction of the arrow in FIG. The tilt of the optical pickup 20 in the direction perpendicular to the moving direction can be adjusted three times.

That is, tangential adjustment of the optical pickup 20 can be performed.

On the lower surface of the mounting body 21, two cam pieces 21c and 21d are provided as shown in FIG. .

is attached to the actuating piece 35, 36, and the switch Sw
, , Sw, tension springs 37, 38 are mounted in the direction away from them.

The switch Sw moves the optical pickup 2 to a position ■ approximately 37 degrees away from the center position ■ of the turntable 32.
When the optical axis of 0 moves, the actuating piece 35 moves as shown in FIG.
is turned on by being pushed by the cam piece 21c against the bias of the tension spring 37.

The switch Sw is set so that the optical axis of the optical pickup 20 is 1.
When the cam piece 21d pushes the actuating piece 36 against the tension spring 38 at position III, which is about 26 ma+ away from the position,
It is pushed by the actuating piece 36 and becomes the ON state.

Then, at the ■ position, which is 5511 IIl away from the 1 position, the cam piece 21d separates from the actuation piece 36, so the actuation piece 36 is rotated by the force of the tension spring 38, and the switch Sw is rotated.

becomes OFF.

Further, the pickup 20 is in a standby state with its front shaft at position 2, which is 63 steps away from the 1st position.

Furthermore, a clamper mounting plate 39 is rotatably attached to one side of the chassis a by a shaft 40 as shown in FIGS. 2 and 3, and this clamper mounting plate 39 and the arm plate 13
A tension spring 41 is installed between the tension spring 41 and the tension spring 41, and its biasing force causes the protrusion 13c of the arm plate 13 and the protrusion 39g of the clamper mounting plate 39 shown in FIG. 21 to come into contact with each other.

Therefore, when the tip of the arm plate 13 descends, the clamper mounting plate 39 is also pulled by the tension spring 41 and its tip also descends, but when the tip of the arm plate 13 rises, the protrusion 39g is pushed up by the protrusion 13c. , the tip of the clamper mounting plate 39 also rises.

A recess 39a is formed at the tip of the clamper mounting plate 39, and the recess 39a and the clamper 42 are rotatably in contact with each other via a ball 43.

A clamper housing body 44 in which this clamper 42 is housed
There is a protrusion 44a on one side of the inside, and a protrusion 44 on the other side of the outside.
b is provided protrudingly.

This clamper housing 44 has a protrusion 44a inserted into a recess 39b of the clamper mounting plate 39 from the lower side of the clamper mounting plate 39.
The protrusion 44b is inserted into the recess 39c, so that the clamper accommodating body 44 cannot be moved in the direction of arrow A with respect to the clamper mounting plate 39.

Further, the protrusion 44a and the protrusion 44b of the clamper housing 44
Opposing recesses 44 are provided on the left and right inner surfaces perpendicular to the line connecting the
c is formed, and a clamper support 45 is formed in this recess 44c.
Projecting pins 45a projecting from the left and right sides are inserted.

A shaft portion 45b provided at the base end of the clamper support body 45
is inserted into the recess 39d of the clamper mounting plate 39, and the protruding piece 46a of the washer 46, which is fixed by a screw 39e screwed into the clamper mounting plate 39, prevents the shaft portion 45b from coming out of the recess 39d.

One end of a spring plate 47, which is fixed to the clamper mounting plate 39 with screws 39e, is pressed into contact with the clamper support 45, and urges the projecting pin 45a downward.

Furthermore, L-shaped projecting walls 4 are provided at the front and rear of the clamper housing 44.
4d is formed between which the protrusion 1 of the arm plate 13
3d is inserted to prevent the clamper housing 44 from moving in the direction of arrow B.

When the arm plate 13 is raised, the protrusion 13d hits the L-shaped upper surface of the protruding wall 44d, and the clamper housing 44 is raised to an angle parallel to the tip of the arm plate 13.

The clamper housing body 44 is connected to the clamper support body 4 as described above.
5, the clamper accommodating body 44 and the clamper 42 accommodated therein are kept in a horizontal state when rising.

Furthermore, as shown in FIGS. 5 and 22 to 25, the chassis a has three switches Sw, Sw.

SWs is installed, and each switch SW, SW4, S
The ws is provided with operation pieces 4B and 49.50 for turning it on and off, respectively.

The lower surface of the cam gear 3 has large diameter portions 3c+, 3d,
Two cam grooves 3c and 3d are formed that connect the small diameter portions 3cz and 3dz.

A bottle 51a is pivotally supported on the chassis a, and a pressing portion 51b pushes the operating piece 48. The bottle 51c of the lever 51 is inserted into the cam groove 3c. The pin 52c of the pushing lever 52 is inserted into the cam groove 3d.

Therefore, when the bottle 51c reaches the small diameter portion 3cz, the lever 5
1 is rotated, the pressing part 51b pushes the operating piece 48 and turns on the switch Sw3, but when it reaches the small diameter part 3c, the lever 51 is rotated in the opposite direction and the pressing part 51b is pushed away from the operating piece 48. Therefore, the switch Sw= is turned OFF.

Similarly, the switch Sw is turned on at the large diameter portion 3d+ and turned off at the small diameter portion 3d.

A cam groove 15d is also formed on the lower surface of the locking plate 15, and a pin 53a is pivotally supported on the chassis a, and a pin 53c of a lever 53 that presses the operating piece 50 with a pressing portion 53b is inserted into this cam groove 15d. has been done.

Therefore, the lever 53 is rotated by the locking plate 15 moving in the vertical direction in FIG.
This is to cause FF.

Further, as shown in FIGS. 13 to 16 and 27, the mounting body 21 of the optical pickup 20 has a distance of 1.29 m from a position perpendicular to the direction of movement of the optical pickup 20. A tilt sensor 54 is attached to the center of the turntable 32 at a position tilted by 15 degrees.

This tilt sensor 54 includes a light emitter 54a and a light emitter 54a.
Photoreceptors 54b and 54C are provided on both sides of 4a, and the light emitted from the light emitter 54a is reflected by the optical disk b.

If the optical disc b is tilted with respect to the tilt sensor 54, a difference occurs in the amount of light received by the photoreceptors 54b and 54c, so the tilt of the optical disc b is detected.

Next, the operation of this optical disc reproducing apparatus from the eject position will be explained.

The state in this position is shown in Figures 1, 3, 4, and 8.
14 and 22.

In this state, there are 30 holes and 25 holes in diameter on the tray 10.
C! When a video disc I, a 12 cm video disc, or a digital audio disc is loaded and a play command is given to play these discs B, the motor l
is rotated.

When the cam gear 3 is rotated in the direction of the arrow in FIG. 8 due to this rotation, the partially toothed gear 4 integrated with the cam gear 3 is rotated, and the vertically elongated gear 5 in mesh with the partially toothed gear 4 is driven.

Since the rack 10d of the tray 10 is engaged with this vertical gear 5, the tray 10 can be moved by the roller 8A of the elevating plate 7,
The guide groove 10aylob is guided by 8B, 9A, and 9B, and the guide groove 10C is guided by the roller 11 of the chassis a and the roller 13A of the arm plate 13.
a) Move as shown in Figure 9.

The end of the guide groove 10a is a roller 8A.

9A, the top opening at the end of the guide groove 10c reaches the roller 11. That is, the tray 10 is drawn into the reproduction apparatus as shown in FIG. 6(a).

In this way, when the retraction of the tray 10 is completed,
Due to the toothless portion of the toothless gear 4, the drive to the vertically elongated gear 5 is stopped, and the tray 10 is stopped at that position.

At this time, due to the rotation of the cam gear 3, the bin 52c that was in the small diameter part 3d+ moves to the large diameter part 3dz, so the second
As shown in FIG. 6, the switch Sw is turned on and it is detected that the motor 1 has started rotating.

Also, when ejecting, at the end, switch S
Since w is turned off, the motor 1 is stopped and the ejecting operation is completed.

As described above, before the tray 10 is pulled in to the position shown in FIG. 6(a), the arcuate portion 3b of the cam groove 3b has finished passing the position of the pin 15b of the locking plate 15, and the cam portion 3b,
starts to come into contact with the bottle 15b, the locking plate 15 moves to the right to the position shown in FIG. .

In this way, when the locking plate 15 moves to the right, the cam groove 1
5d, the switch S is turned on by the lever 53 as shown in FIG.
ws is turned OFF, and it is detected that the horizontal movement of the tray 10 is completed.

Before the locking plate 15 moves as shown in FIG. 5 and the arm 6b is unlocked from the locking plate 15, the pin 3a of the cam gear 3 enters the 7-shaped groove 6C.

Then, the locking of the arm portion 6b by the locking plate 15 is released,
When the bottle 15b reaches the arcuate portion 3b and the locking plate 15 is held at that position, the groove 6C is pushed by the bottle 3d and the slide plate 6 moves to the sixth position as shown in FIG. 7(a). Move it to the left with respect to figure (a).

Therefore, the bottle 7a is guided to the cam hole 6a of the slide plate 6, the elevating plate 7 is lowered, and its rollers 8A, 8B, 9
The tray 10 with guide grooves 10a and 10b inserted in A and 9B also tries to descend together.

At this time, since the top opening of the end of the groove 10c on the opposite side of the tray 10 is located at the position of the roller 11, the roller 11 can be removed from the top opening.

The above-mentioned lowering of the elevating plate 7 is performed by inserting the pin 13b into the connecting hole 7b.
The arm plate 13 into which the pin 13b is inserted rotates in the direction of lowering its tip as the pin 13b descends together with the elevating plate 7.

Therefore, the roller 13A of the arm plate 13 is also lowered by the same amount as the lowering amount of the lifting plate 7, pushing down the guide groove 10c, removing it from the roller 11, and lowering this side of the tray 10 as well.

By lowering the tray 10 in this manner, the disc b placed thereon is transferred onto the turntable 32.

On the other hand, as the locking Fi 15 moves as shown in FIG. 5, the lower part of the push-up cam 15c moves to the position of the contact piece 23b of the support plate 23, and the contact piece 23b is once lowered as shown in FIG.

In this way, when the lowering of the elevating plate 7 due to the movement of the slide plate 6 is completed, the locking plate 15 starts moving in the opposite direction again by the cam portion 3b4, and the switch Sw5 is turned on, so that the lowering operation of the elevating plate 7 is completed. completion is detected.

The downward rotation of the tip of the arm plate 13 is caused by the tension spring 41.
The clamper mounting plate 39 is rotated so that its tip is lowered.

Therefore, as described above, the clamper 42, which remained horizontal during the ascent, is placed on the disk b transferred onto the turntable 32 as it is.

The tip of the arm plate 13 continues to descend, but the clamper 42 rotates the clamper support 45 by the bias of the spring plate 47 and stretches the tension spring 41, so that it does not descend any further.

In this way, the disk b is pressed against the turntable 32 by the clamper 42, and the disk b is rotated by the rotation of the spindle motor 31.

The detection of the completion of the lowering of the elevating plate 7 also means the detection of the completion of the clamper.

As mentioned above, when the tray 10 is moved horizontally, the four rollers 8A, 8B, 11, and 13A provide support in the horizontal direction, but when the tray 10 moves vertically, the rollers 8A, 8B, and 1
There will be three of 3A.

Furthermore, if the arm plate 13 is twisted due to some resistance or dimensional variation, the heights of the rollers 8A, 8B on the negative side and the roller 13A on the other side will be inconsistent, and the height of the tray 10 will be tilted. There is a risk of this happening.

Then, the guide grooves 10a, 10b, 10c are aligned with the roller 8A.
, 8B, 9A, 9B, 13A, the angle is as shown in FIG. 12, and the rollers 8A, 8B, 9A, 9B, 1
If 3A is cylindrical, these are the guide grooves 10.
It digs into a s 10 b * 10 c, deforms it, and prevents it from sliding smoothly.

In order to prevent such a situation, the roller 8A.

8B, 9A, 9B, 11.13A are shown in Figures 11 and 12.
As shown in the figure, it has a spherical shape with an enlarged tip to prevent it from digging into the guide grooves 10a, 10b, and 10C as described above.

In this way, the disk b is transferred to the turntable 32,
The cam gear 3 continues to rotate even after the clamping by the clamper 42 is completed, and the pin 15b reaches the cam portion 3ba of the cam groove 3b, moving the locking plate 15 toward the left in FIG. 5, and locking the arm portion 6b. The slide plate 6 is stopped to prevent movement of the slide plate 6.

At this time, since the pin 3a has been removed from the Y-shaped enlarged portion of the groove 6c, the slide plate 6 will not be moved even if the cam gear 3 continues to rotate.

As described above, as the locking plate 15 moves to the left, the push-up cam 15c starts pushing up the contact piece 23b against the bias of the tension spring 25.

Then, the intermediate portion of the cam portion 3ba of the cam groove 3b is connected to the pin 1.
When the position 5b is reached, as shown in Fig. 25, the pin 52
c reaches the small diameter portion 3az of the cam groove 3d, and the switch Sw,
becomes OFF.

Horizontal portion 15C of push-up cam 15c! reaches the contact piece 23b, it is detected that the support plate 23 has become substantially horizontal with the axis 19 as the center, and the motor 1 is stopped.

If the contact piece 23b crosses the horizontal part 15c2 due to overrun of the motor, the pin 53c will move into the cam groove 15d.
The lever 53 turns off the switch Sws. That is, when switch Sw4 is off, switch Sw
In the position where s is on, the support plate 23 is horizontal.

At this time, the optical axis of the optical pickup 20 is at the V position of 63 mm from the center of the turntable 32 in FIG. 13, and the switches S Wl , S W! is OFF as shown in FIG.

FIG. 29 shows that the motor 2 is activated by the switches Sw, Sw, and the focus signal FS of the optical pickup 20.
6 rotation control, optical pickup 20 playback output PO
This is a block diagram of a circuit that performs
Shown in Figure 0.

In the figure, 55 is a control circuit, Ilo is an input/output port,
ROM is read-on memory, and RAM is random access memory.

As described above, when the setting of disk b is completed and the switches Sw, Sw, are OFF, the optical pickup 20 moves to the disk b in step Sl as shown in FIG.
Try to get focus by reflection.

At this time, disk b is not set or the diameter is 12C.
In the case of an I or 8 cm disc, the focus signal FS cannot be obtained because it is not reflected at the V position.

Further, in the case of the video disc b having a diameter of 20C11 or 30C11, since the focus signal FS is obtained, the switch Sw! Move to ■ position where is ON.

On this disk b, TOC information is recorded at the radial position 55 nu++ of the position ■, so the optical pickup 20 reads this TOC information and performs step S.
Then, this disk b is played back.

At the end of this reproduction, if there is a next reproduction command as step 4, the process returns to step S as step S4 in accordance with the next reproduction command, and the disc b is reproduced.

However, when there is no regeneration command, as step SS,
(2) and returns to the V position as step S.

If the focus signal FS is not obtained in step S, the switch Sw, which was once turned on, is sent to the position (2) where it is turned off again in step S7.

Then, in step S, the operation is performed again to obtain the focus signal FS, but here also the focus signal F
If S is not obtained, it is assumed that disk b is not set, and the process moves to step S.

However, when the focus signal FS is obtained at this position, it is assumed that a disc with a diameter of 12 cm or a diameter of 8 cI11 is set, and the T
The OC information is read as step S.

Then, when this information is read, the disk b
As a step SIO, the reproduction is performed.

When the playback is finished, in step S14, if there is a next playback command, the process returns to step S13 according to the playback command, but if there is no playback command, step S14 is performed.
Return to s.

However, in a CDV (compact disc with image), the TOC information at this ■ position is read and step SI! As a result, the switch Sw is moved to the position (2) where it is turned on, and the playback is performed at step S.

Then, step SI when the playback of that video portion is finished.
! In step SI3, the audio is played back.

In this way, the disc b is played back. During the playback of the video part of the LD or CDV, the tilt sensor 54 continues to remove the tilt of the disc b, and when the tilt is detected, the motor 1 is activated. Depending on the direction of the inclination, it is rotated either forward or backward.

Then, the locking plate 15 moves according to the rotation, so
The amount of push-up of the contact piece 23b by the push-up cam 15c is the 26th
The support plate 23 is tilted about the shaft 19 by changing centering around the position ■ in the figure.

When the inclination of the support plate 23 matches the inclination of the disk b so that both become parallel and the amounts of light received by the photoreceptors 54b and 54c become the same, the motor l stops.

In this way, the tilt adjustment of the optical pickup 20 is performed.

As shown in FIG. 27, the line Y connecting the light receiving bodies 54b, 54c1 and the light emitter 54a of the tilt sensor 54 is attached at an angle of 15 degrees with respect to the movement line Z of the optical axis of the optical pickup 20. There is.

This angle is different from the conventional movement line Z in FIG.
4b, 54c, and the light emitting body 54a, when the line X connecting the light emitting body 54a is parallel, the angle between the line Z and the line Z when reproducing the innermost circumference 55 mm of a disk b having a diameter of 30 cm is 21.4 degrees, and when the outermost circumference 147M is reproduced. The middle point between the angle of 8 degrees, i.e. (8+21.4)/2
Based on =14.7-15.

Also, 1°29- from the optical axis ■ of the optical pickup 20.
The reason why the center of the tilt sensor 54 is shifted inward by 3 m is when the optical axis ■ is at the outermost circumference of 147 mm.
The object is to be located at a position 147M from the center .

The detection angle θ of the tilt sensor 54 when the warpage angle θa of the disk b is 2 degrees when set in this way is the third
As shown in Figure 0, when calculated according to CO3α, θ is 2.020 degrees at the circumference and 2.013 degrees at the outer periphery.

Therefore, the difference θ, -θ1 from the actual warp angle θ is at most 0.
0.02 degrees, which is an improvement of 0.128 degrees compared to the conventional 0.148 degrees.

〔Effect of the invention〕

As described above, according to the present invention, the slide plate, which is an elevating cam member, and the locking plate, which is a locking member, are driven at necessary times by the rotation of the cam gear, which is a driving member, and the clamper is raised and lowered. It is held in that position.

When a warp is detected during playback of the optical disc, the drive member rotates again 1, and the locking member moves while locking the elevating cam member, locking one end of the mounting member. A tilt cam of the stop member is raised and lowered to perform a tilt operation.

Therefore, since the clamping, chilling, and ffl adjustment of the optical disk can be performed by the operation of the driving member, one driving motor is sufficient, compared to the conventional two motors.

In addition, the locking member has two roles: locking the elevating cam member and adjusting the tilt, which simplifies the mechanism and reduces the number of parts, which helps reduce costs and improve reliability. It is.

[Brief explanation of the drawing]

Figures 1 to 30 show an optical disc playback device based on the present invention. Figure 1 is an overall plan view, Figure 2 is a plan view with the case removed, and Figure 3 is a clamper section. 4 is a front view of the whole, FIG. 5(a) is a plan view of the loading drive section, and FIG.
b) is a sectional view of the push-up cam in the same figure as above, Figures 6(a), (b) and 7(a), (b)
is a side view showing the operation of the elevating plate, FIGS. 8 to 10 are plan views showing the operation of the loading drive unit and the tray, and FIGS. 11 and 12 are front views showing the relationship between the guide groove of the tray and the rollers. , Fig. 13 is a plan view of the optical pickup operating section, and Fig. 14 is a plan view of the optical pickup operating section.
Figure 15 is a side view showing the tilt operation, Figure 16 is a side view showing the adjustment of the moving axis of the optical pickup, Figure 17 is a plan view of the tangential adjustment section of the optical pickup, and Figure 18 is a side view showing the tilt operation. and Fig. 19 is a side view showing its adjustment, Fig. 20 is a front view thereof, Fig. 21 is an exploded perspective view of the clamper section, and Figs. 22 to 25 are plan views showing the operating state of the switch due to the rotation of the cam gear. Figure 26 is a line diagram showing the detection of the operating status of each part by the operation of the switch, Figure 27 is a plan view showing the operating dimensions and angles of the tilt sensor, and Figure 28 is the position of the optical pickup and the position of the switch. 29 is a block diagram of a circuit including a control circuit, and FIG. 30 is a flowchart thereof. a... Chassis, b... Optical disc, 1...
Motor, 3...cam gear, 3a...bin, 3b...
・Cam groove, 6...Slide plate, 6a...Cam hole, 6
b... Arm portion, 6C... Groove, 7... Lifting plate, 10.
... Tray, 13... Arm plate, 15... Locking plate,
15b... Bottle, 15c... Push-up cam, 20...
Optical pickup, 22... Guide shaft, 23...
Support plate, 23b... Contact piece, 25... Tension spring, 31
... spindle motor, 32... turntable,
39... Clamper mounting plate, 42... Clamper. Figure 17 Figure 18 Figure 19 Figure 20 Figure 22 ¥i, Figure 24C Figure 23 Figure 25

Claims (1)

[Claims] A lifting cam member that raises and lowers the clamper by the operation of a driving member, a locking member that is moved by the driving member and locks the operation of the lifting cam when the lifting cam member finishes raising and lowering the clamper, and a locking member that locks the lifting cam. A tilt cam and an optical pickup are mounted and supported for linear movement,
1. An optical disc playback device comprising: a mounting member provided with a contact piece that comes into contact with a tilt cam when biased.