JPH02189720A - Pickup optical axis adjustor for optical disk reproducing device - Google Patents

Abstract

PURPOSE:To attain ease of the tangential adjustment by devising the device such that the tangential adjustment is implemented from outer and upper side from an outer circumferential of a set disk. CONSTITUTION:An auxiliary mount plate 33 is supported by a mount body 21 and a distance between the auxiliary mount plate 33 and the mount body 21 is varied by the adjustment of one adjustment means, then the auxiliary mount plate 33 is tilted around a support point. When the adjustment means is made up of, e.g., screws 33c, 33d and a compression spring 34, continuous adjustment is attained by tightening and loosening of the screws 33c, 33d. Moreover, since the adjustment means is provided to a location apart in the direction of a guide axis 22, the adjustment means is placed at the outer side from the outer diameter of the optical disk (b) set to the turntable. Thus, the adjustment is attained while the optical disk (b) is set and the tangential adjustment is facilitated by the ease of the adjustment.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to an optical disc reproducing apparatus for reproducing information recorded on an optical disc such as an optical video disc or a digital audio disc. Pickup optical axis of an optical disc playback device for performing tangential adjustment to make the optical axis of the optical pickup that reads the signal perpendicular to the optical disc in a plane perpendicular to the straight line passing through the center of the turntable. Relating to an adjustment device.

[Conventional technology]

The third pickup optical axis adjustment device of an optical disc playback device for performing this type of tangential adjustment in the past.
It is shown in Fig. 1 and Fig. 32.

In the same figure, 60 is attached on the board, //-
(The optical pickup 62 attached to the mounting body 61 is guided from the center of the optical disc toward the outer periphery.

This guide shaft 60 has two fitting parts 62 of the mounting body 62.
Since a and 62b are fitted and guided, the mounting body 62 will not tilt with respect to the guide shaft 60.

On the side opposite to the fitting parts 61a and 61b of this mounting body 61,
Slide piece 6 guided by guide piece 63 of the board
4, a screw 65 is screwed together with the push spring 6.
6 is installed.

Therefore, when the screw 65 is tightened against the push spring 66, the mounting body 61 rotates about the guide shaft 60 in the direction of the arrow in FIG. 32.

Therefore, since the optical axis C of the optical pickup 62 can be tilted left and right with respect to the surface of the optical disc, its tangential adjustment can be performed.

[Problem to be solved by the invention]

Due to its mechanism, such a conventional optical axis adjustment device for a pickup cannot have a large dimension 2 between the center of the screw 65 and the optical axis C in the direction of the guide axis 60.

Since this tangential adjustment is performed by setting an optical disc, the screw 65 cannot be rotated from above, and the adjustment must be performed from the bottom or side.

Therefore, if the screw 65 is rotated from the side, the rotation centers are perpendicular to each other, making the operation extremely difficult.

Also, if you do it from the bottom, you will have to make holes in some parts such as the board, which may reduce the strength of these parts,
There were drawbacks such as the limited location for adjustment work.

[Purpose of the invention]

The present invention solves the above-mentioned problems of the pickup optical axis adjustment device of the conventional optical disc playback device, and enables the tangential adjustment to be performed from above and outside the outer periphery of the set disc. The purpose is to make adjustments easier.

[Summary of the Invention] The present invention relates to a pickup optical axis adjusting device for an optical disc playback device to achieve the above-mentioned object, and an optical pickup is attached to the guide shaft of the support plate.
a mounting body on which a point is guided; an auxiliary mounting plate that is pivotally supported by the mounting body and on which a point slides on the support plate; and an example of a pivot point between the auxiliary mounting plate and the mounting body. and adjustment means for adjusting the dimensions therebetween.

[Embodiments of the invention]

Next, an example of the implementation of the present invention will be described with diameters of 30 cm and 20 cm.
, 12CII+, and 8 cm optical discs will be described below.

In Fig. 5, reference numerals 1 and 2 are motors attached to the chassis a, and a cam gear 3 meshes with a gear 2 rotated by the motor 1 via a reduction mechanism, and a partially toothed gear 4 integrated with the cam gear 3. The interlocking gears drive a vertically long gear 5 having vertically carved teeth.

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. 7 bottles 7a are 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 can be moved in the front-rear direction in FIG. 4 with respect to the elevating plate 7, with its guide grooves 10at10b being guided by the rollers 8A, 8B, 9A, and 9B.

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 upper surface opening of the roller 11 and one end of the guide grooves 10 and C coincide with each other, when the arm plate 13 rotates around the shaft 12, the roller 11
is removed from the upper surface opening of the guide groove 10c, and the tray 10 becomes able to descend.

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 and the shaft 7d of the chassis a, 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 6c is bored in the arm portion 6b of the slide plate 6, and the pin 3a protruding from the upper surface of the cam gear 3 is inserted into the 7-shaped enlarged tip of the groove 60. Kara groove 6
After entering the slot 6c and moving the slide plate 6 by pushing the groove 6c, the puller exits from the enlarged end portion of the figure 7 shape of the groove 6c.

On the upper surface of the cam gear 3, there are two arcuate portions 3b, 3b, and the arcuate portions 3b centered on the center of the cam gear 3.

and 3bz, and a cam portion 3b3 and an arcuate portion 3b.

A cam groove 3b consisting of a cam portion 3b4 extending toward the outer diameter side is bored.

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 3b1 of the cam groove 3b, the locking plate 15 will not move even if the cam gear 3 rotates, but when the pin 15b reaches the cam portion 3bz, the locking plate 15 will not move. 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 the pin 15b reaches the cam portion 3b, the locking plate 15 moves to the left again and the cam It reaches the end of the section 3b4.

In this way, the pin 15b forms the arcuate portion 3b.

and cam portion 3b, and when the locking plate 15 is moving to the left, its tip contacts the end surface of the arm portion 6b of the slide plate 6 as shown in FIGS. 8 and 10. This prevents the sliding plate from sliding.

When the pin 15b is in the arcuate portion 3b 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 60,
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 Fi23 will be attached to the chassis a.
A stop plate 55 that is pivotally supported by the
If the shaft 19 is fixed to the chassis a at 6, the shaft 19 is 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.

Further, a tension spring 25 is installed between one side of the support plate 23 and the chassis a, and urges that side of the support plate 23 downward. 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(b), c is composed of an inclined portion 15c+, a horizontal portion 15C2, and an inclined portion 15C3. 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 rank 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. As a result, rotation of the rotating plate 28 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 the slide piece 33a that slides along the direction d is attached.
screws 33c and the mounting body 2 installed vertically on the auxiliary mounting plate 33.
1, the recess 33b is pressed against the protrusion 21b protruding from the lower surface of the mounting body 21.

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. It is possible to adjust the circumference when the optical pickup 20 is tilted in a direction perpendicular to the moving direction.

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, and the actuating pieces 35 and 36 include a switch Sw.
, , Sw, tension springs 37, 38 are mounted in the direction away from them.

When the optical axis of the optical pickup 20 moves from the center position (2) of the turntable 32 to a position (2) approximately 37 mm away, the switch Sw opens the operating piece 3 as shown in FIG.
5 is turned on by being pushed by the cam piece 21c against the bias of the tension spring 37.

The switch Swz is set so that the optical axis of the optical pickup 20 is 1.
At position III, which is approximately 26 mm away from the position, the cam piece 21d pushes the actuating piece 36 against the tension spring 38, thereby being pushed by the actuating piece 36, and becomes in the ON state.

Then, at position ■, which is 55 mm away from position ■, cam piece 2
1d separates from the actuating piece 36, the actuating piece 36 rotates by the force of the tension spring 38, and the switch Sw.

becomes OFF.

Also, the optical axis of the pickup 20 is 63 m from the position
It is waiting and stopped at position ■, m away.

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.
A protruding pin 45a protruding from the left and right sides is 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 protrusion 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 raised.

Furthermore, as shown in Fig. 5 and Fig. 22 to Fig. 25, three switches Sw, , 5w45w5 are attached to the chassis a, and each switch Sw, , Sw4, Sws can be turned on or off. Operation piece 48, 49.50
is provided.

The lower surface of the cam gear 3 has large diameter portions 3c+, 3d,
Two cam grooves 3c connecting the small diameter portion 3c2t3dz
, 3d are formed.

A pin 51a is pivotally supported on the chassis a, a pressing portion 51b pushes the operating piece 48, a pin 51c of the lever 51 is inserted into the cam groove 30, a pin 52a is pivotally supported on the chassis a, and the pressing portion 52b pushes the operating piece 49. 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 3C2, the lever 5
1 is rotated, the pressing part 51b presses the operating piece 48, turning on the switch Sw, 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, switch SW4 is also turned on at large diameter section 3d.
and turns off at the small diameter portion 3dz.

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.

Furthermore, as shown in FIGS. 13 to 16 and 27, the mounting body 21 of the optical pickup 20 has a 1.29 mm turn 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 table 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, a diameter of 30 cm, 2
When a 5 cm video disc, 12 cm video disc, or digital audio disc is placed and a play command is given to play these discs b, motor 1
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 lOd of the tray 10 is engaged with this vertically elongated gear 5, the tray 10 is
8B2, 9A, 9B guide the guide grooves 10a, l/Ob, and the guide groove 10C is guided by the roller 11 of the chassis a and the roller 13A of the arm plate 13, as shown in FIGS. 6(a) and 9. Move to.

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 bottle 52c that was in the small diameter part 3d moves to the large diameter part 3d2, so the second
As shown in FIG. 6, it is detected that the switch SW4 is turned on and the motor 1 starts 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 mentioned 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 passed through the position of the pin 15b of the locking plate 15, and the cam portion 3b3
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, switch 3 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 into the 7-shaped groove 60.

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

Therefore, the pin 7a is guided to the cam hole 6a of the slide plate 6, the elevating plate 7 is lowered, and the rollers 8A, 8B,
The tray 10 with guide grooves 10a and 10b inserted into 9A 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 plate 15 moves as shown in FIG.
3b, and the contact piece 23b is lowered once as shown in FIG.

In this way, when the descent 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 SW is turned on, so that the elevating plate 7 is lowered. Completion of the operation 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, horizontal support during horizontal movement of the tray 10 is performed by four rollers 8A, 8B, 11, and 13A, but during vertical movement, rollers 8A, 8B,
There will be three 13A.

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 connected to the roller 8.
With respect to A, 8B, 9A, 9B, 13A, the angle is as shown in Fig. 12, and the rollers 8A, 8B, 9A, 9B,
If 13A is cylindrical, these are the guide grooves 10.
It digs into a, 10b, and 10c, deforms them, and prevents them 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, IQb, and 10C as described above.

Thus, 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 3b4 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 3b4 of the cam groove 3b is connected to the pin 1.
When reaching position 5b, 1. as shown in Figure 25. pin 5
2c reaches the small diameter portion 3d2 of the cam groove 3d, and the switch SW
4 becomes OFF.

When the horizontal portion 15c2 of the push-up cam 15c reaches the contact piece 23b, it is detected that the support plate 23 has become substantially horizontal with the shaft 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
, is on, the support plate 23 is horizontal.

At this time, the optical axis of the optical pickup 20 is at position 3, 63 mm from the center of the turntable 32 in FIG. 13, and the switches S W 1 and SW are OFF as shown in FIG. 28.

FIG. 29 shows that the motor 2 is activated by the switches Sv, Sw2 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 mentioned above, when the setting of disk b is completed and the switches Sw, SW2 are OFF, the optical pickup 20 moves to the disk b in step S1 as shown in FIG.
Try to get focus by reflection.

At this time, if the disc is not set or the diameter is 12cm.
In the case of a disc with a diameter of m or 8 cm, the focus signal FS cannot be obtained because the light is not reflected at the position (3).

Further, in the case of a video disc b having a diameter of 20 cm or 30 cm, since the focus signal FS is obtained, the switch Swz is moved to the position (2) where it is turned on in step S2.

Since TOC information is recorded on this disk b at a position approximately 55 mm in radius from the position 2, the optical pickup 20 reads this TOC information and plays back this disk b in step S3.

At the end of this playback, if there is a next playback command in step 4, the process returns to step S3 in step S4 in accordance with the playback command, and the disc b is played back.

However, if there is no regeneration command, step S is performed.

As step Sb, the process returns to the position ■ via the position ■.

In step S1 described above, if the focus signal FS is not obtained, in step S, the switch Sw, which has been turned ONL once, is sent to the position (2) where it is turned off again.

Then, in step S8, focus confidence % F is again set.
S (operates), but if the focus signal FS is not obtained here as well, it is assumed that disk b is not set, and the process moves to step S5.

However, when the focus signal FS is obtained at this position, it is assumed that a disc with a diameter of 12 cm or 8 cm is set, and the TO of the digital audio disc recorded at this position (■), which has a radius of approximately 26 mm, is
The C information is read in step S9.

Then, when this information is read, the disk b
As, step S,. Then, the playback is performed.

When the playback is completed, in step S14, if there is a next playback command, the process returns to step Sll in accordance with the playback command, but if there is no playback command, the process returns to step S5.

However, in the case of a CDV (compact disc with image), the TOC information at this position (2) is read, the TOC information is moved to the (2) position where the switch SW4 is turned on in step SI2, and the playback is performed in step S11.

Then, step SI when the playback of that video portion is finished.
In □, the process moves to step Sk3, and the audio is played back.

In this way, the disc b is played back, but during the playback of the video part of the LD, C, or DV, the tilt sensor 54 continues to remove the high part of the disc b, and the tilt is detected. According to the direction of the inclination, the motor 1 is rotated in either forward or reverse direction.

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.
When the line X connecting 4b, 54c, and the light emitter 54a is parallel, the angle between the line Z and the innermost circumference 55 of disk b with a diameter of 30 cm is 21.4 degrees, and the outermost circumference 147 is reproduced. The middle point between the angle of 8 degrees, i.e. (8+21.4)/2=
14.7L=, 15.

Also, 1°29- from the optical axis ■ of the optical pickup 20.
The reason why the optical axis ■ was shifted inward by 3 mm was that the outermost circumference was 147 m.
This is to ensure that the center of the tilt sensor 54 is located at a position 147 mm from the center I of the turntable 32 when it is at u+.

The detected angle θ of the tilt sensor 54 when the warpage angle θ7 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, θL=2.020 degrees at the circumference and 2.013 degrees at the outer circumference.

Therefore, the difference θ, -θ, from the actual warp angle θ7 is at most 0.
0.02 degrees, which is an improvement of 0.128 degrees compared to the conventional 0.148 degrees.

[Effects of the Invention] As described above, the auxiliary mounting plate of the present invention is pivotally supported by the mounting body, and by adjusting the adjustment means on the negative side of the auxiliary mounting plate to change the distance between the auxiliary mounting plate and the mounting body, the auxiliary mounting plate can be fixed. The board tilts around the pivot point.

Therefore, that side of the mounting body moves up and down in accordance with the inclination of the auxiliary mounting plate, so the mounting body rotates around the guide axis and aligns the optical axis of the optical pickup vertically in a plane perpendicular to the guide axis. can be adjusted to

If this adjusting means is a screw and a push spring as in the embodiment, continuous adjustment can be made by tightening and loosening the screw.

Furthermore, this adjustment means can be provided at a location away from the guide axis direction, rather than at the side of the optical pickup as in the conventional case, so it can be provided at a location outside the outer diameter of the optical disc centered on the turntable. It is possible to do so.

Therefore, the tangential work of the optical pickup can be facilitated by being able to set the optical disc and making adjustments, and by making the adjustment easy.

[Brief Description of the Drawings] Figures 1 to 30 show an optical disc playback device based on the present invention. Figure 1 is an overall plan view, and Figure 2 is a plan view with the case removed. , Fig. 3 is a plan view of the clamper section, Fig. 4 is a front view of the whole, Fig. 5 (a) is a plan view of the loading drive section, Fig. 5 (
b) is a sectional view of the push-up cam in the same figure as above; Fig. 6(a), [with]) and Fig. 7(a), □□□) are side views showing the operation of the elevating plate; Fig. 8 - Figure 10 is a plan view showing the operation of the loading drive section and the tray, Figures 11 and 12 are front views showing the relationship between the guide groove of the tray and the rollers, and Figure 13 is a plan view of the optical pickup operation section. , 14th
Figure 15 is a side view showing the tilting 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 Kunsential 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 the adjustment, Fig. 20 is a front view, 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, Figure 28 is the position of the optical big amplifier and the switch 29 is a block diagram of a circuit including a control circuit, FIG. 30 is a flowchart thereof, FIG. 31 is a plan view of a conventional pickup optical axis adjustment device, and FIG. 32 is a front view thereof. It is. a...Chassis, b...Optical disc, 20...
・Optical pickup, 21... Mounting body, 21b...
・Protrusion, 22... Guide shaft, 23... Support plate, 23
d...-side, 31... Spindle motor, 32...
・Turntable, 33... Auxiliary mounting plate, 33a...
・Slide piece, 33b... recess, 33c, 33d...
・Screw, 34...Press spring. Patent applicant: Pioneer Corporation Figure 18 Figure 24 Figure 3d Figure 25 ■ ■ VV Figure 28 Figure 29

Claims (1)

[Claims] A mounting body to which an optical pickup is attached and guided at two points by a guide shaft of a support plate; an auxiliary mounting plate that is pivotally supported by the mounting body and one point slides on the support plate; and the auxiliary mounting plate. A pickup optical axis adjusting device for an optical disc reproducing device, comprising: an adjusting means provided on one side of the pivot point between the plate and the mounting body, and capable of adjusting a dimension therebetween.