JP3057604B2 - Pickup optical axis adjustment device for optical disc playback device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to an optical disc reproducing apparatus for reproducing information recorded on an optical disc such as an optical video disc and a digital audio disc. Optical axis adjustment of the optical disc reproducing device for performing tangential adjustment to make the optical axis of the optical pickup reading the signal of the optical disc orthogonal to the optical disc in a plane orthogonal to the straight line passing through the center of the turntable. Related to the device.

[Conventional technology]

Conventionally, a pickup optical axis adjusting device of an optical disc reproducing apparatus for performing this kind of tangential adjustment is described.
These are shown in FIGS. 31 and 32.

In the figure, reference numeral 60 denotes a guide mounted on a substrate, and an optical pickup mounted on a mounting body 61.
62 is guided from the center of the optical disc toward the outer periphery.

The guide shaft 60 has two fitting portions 61a, 61 of the mounting body 61.
b is fitted and guided, so that the mounting body 61 is
Never lean against.

A screw 65 is screwed and a pressing spring 66 is mounted between the mounting member 61 and the slide piece 64 guided by the guide piece 63 of the board on the side opposite to the fitting portions 61a and 61b. ing.

Therefore, if the screw 65 is tightened against the pressing spring 66,
The mounting body 61 rotates around the guide shaft 60.

Therefore, the optical axis c of the optical pickup 62 can be inclined left and right with respect to the surface of the optical disc, so that its tangential adjustment can be performed.

[Problems to be solved by the invention]

In the conventional optical axis adjusting device of such a pickup, the dimension l of the center of the screw 65 and the optical axis c in the direction of the guide axis 60 cannot be made large due to its mechanism.

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

Therefore, if the rotation operation of the screw 65 is performed from the side, since the rotation centers are orthogonal to each other, the operation becomes very difficult.

In addition, if the operation is performed from the lower surface, holes must be formed in some parts such as a substrate, and there are disadvantages in that the strength of these components is deteriorated and the place where the adjustment work is performed is limited.

[Object of the invention]

The present invention solves the above-mentioned problem of the conventional optical disc adjusting device of the optical disc reproducing apparatus, and adjusts the tangential so that the tangential adjustment can be performed from above the outer periphery of the set disc. The purpose is to make it easier to do.

[Summary of the Invention]

The present invention relates to a pickup optical axis adjustment device of an optical disc reproducing apparatus for achieving the above-mentioned object, and relates to an optical disc drive in which a guide shaft of the optical pickup extends in substantially the same direction as a disc ejection and storage direction. In a disc reproducing apparatus, an optical pickup is mounted, and is slid while being guided by a guide shaft, and is rotatable around the guide shaft. An auxiliary mounting plate having a slide piece that is pivotally supported by the mounting body so as to rotate against the elastic force with the direction as a center axis and has a sliding piece that slides on the support plate, and an outer diameter of the disk set on the turntable. Adjustment means provided on the auxiliary mounting plate on the outside and adjusting the amount of rotation of the mounting body with respect to the auxiliary mounting plate is provided, and the amount of rotation is adjusted by the adjusting means with the slide piece as a fulcrum, With body is rotated around the guide shaft and adjusts the optical axis of the optical pickup.

(Example of the invention)

Next, an example of the embodiment of the present invention, diameter 30cm, 20cm, 12c
An optical disc reproducing apparatus capable of reproducing any of the optical discs of m and 8 cm will be described below.

In FIG. 5, reference numeral 1 denotes a motor mounted on a chassis a. A cam gear 3 meshes with a gear 2 rotated from the motor 1 via a reduction mechanism, and meshes with a toothless gear 4 integral with the cam gear 3. By means of the interlocking gear, a vertically long gear 5 having a vertically elongated tooth is driven.

In FIG. 6 (a), reference numeral 6 denotes a slide plate which is supported by the chassis a so as to be movable only in the left-right direction, and an elevating plate which is supported by the cam holes 6a so as to be movable only in the vertical direction by the chassis a. 7 pin 7a is inserted.

Therefore, when the slide plate 6 slides left and right,
The pin 7a is guided by the cam hole 6a, and the lift plate 7 moves up and down.

As shown in FIG. 3, the lift plate 7 has two rollers 8A, 8B supported in the horizontal direction, and two rollers 8A, 8B supported in the vertical direction at the same position in the front-rear direction as the rollers 8A, 8B. Two rollers 9
A and 9B are attached.

The rollers 8A and 8B have guide grooves 10a formed on one side of the tray 10 on which the optical disc b is placed as shown in FIGS. 8 and 10, and the rollers 9A and 9B have the guide grooves 10a. The guide groove 10b on the bottom is fitted.

Therefore, the guide grooves 10a and 10b of the tray 10
Guided by A, 8B, 9A, 9B, it can move in the front-rear direction of FIG.

On the other side of the tray 10, there is provided a guide groove 10c which is open upward at one end as shown in FIG. 4, and the guide groove 10c has a roller horizontally supported by a chassis a. 11 and an arm plate 13 pivotally supported by a shaft 12 of the chassis a.
, A roller 13A that is supported in the horizontal direction is inserted.

Therefore, the tip of the arm plate 13 is in the raised position and the roller 1
When 1, 13A are at the same horizontal position, the tray 10 can move 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 surface opening at one end of the guide groove 10c coincide with each other, the arm plate 13
When the roller 11 rotates about the shaft 12, the roller 11
Withdrawing from the upper opening of c, the tray 10 can be lowered.

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

Further, as shown in FIG.
The vertically long gear 5 moves up and down while being rotatably mounted on a shaft 7c provided on the shaft a and being supported by the shaft 14 of the chassis a and the shaft 7a.

Therefore, the vertical gear 5 does not disengage with the gear for driving the vertical gear 5 even if the lift plate 7 moves up and down.
Accordingly, the rack 10d of the tray 10 which moves up and down is always engaged with the rack 10d.

Further, as shown in FIG. 5, a Y-shaped groove 6c is formed in the arm 6b of the slide plate 6, and a pin 3a protruding from the upper surface of the cam gear 3 is a Y-shaped enlarged end of the groove 6c. , The slide plate 6 is moved by pushing the groove 6c, and then escapes from the Y-shaped enlarged end portion of the groove 6c.

On the upper surface of the cam gear 3, two arc-shaped portions 3b ₁ and 3b ₂ centered on the center thereof, and a cam portion 3 connecting the arc-shaped portions 3b ₁ and 3b ₂
b ₂ , and the cam portion 3 which is directed from the arcuate portion 3b ₂ to the outer diameter side
cam groove 3b consisting of b ₄ are bored.

The pin 15A, which is guided by the pin 14A of the chassis a, the guide groove portion 14B, and the guide hole 15a of the locking plate 15, and protrudes from the lower surface of the locking plate 15 that moves linearly,
Inserted in b.

Therefore, when the pin 15b is at the arcuate portion 3b ₁ of the cam groove 3b is the cam gear 3 is never locking plate 15 is moved be rotated, the pin 15b reaches the cam portion 3b _3, engaging The stop plate 15 moves to the right in FIG. 5 according to the rotation of the cam gear 3.

Then, when the pin 15b reaches the arcuate portion 3b _2, locking plate 15 also rotates and the cam gear 3 is not moved, the locking plate 15 reaches the cam portion 3b ₄ is moved to the left again, The end of the cam portion 3b ₄ is reached.

In this way, the pin 15b is connected to the arc-shaped portion 3b ₁ and the cam portion 3b.
_At the end of ₄ , 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. Blocks the board from sliding.

Then, when the pin 15b is in the arcuate portion 3b _2, locking plate 15 is moved to the right as FIG. 9, the arm portion 6b
Is stopped.

At this time, the pin 3a of the cam gear 3 enters the groove 6c, pushes it, and slides the slide plate 6.

A tension spring 17 is provided between the locking plate 15 and the guide portion 14B to urge the locking plate 15 rightward in FIG.

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

Therefore, after inserting the shaft 19 into the bearing 23a, the shaft 19 is
When the support plate 23 is inserted from above, the support plate 23 is pivotally supported by the chassis a, and the stop plate 55 for fixing the upper surface of the shaft 19 is fixed to the chassis a by screws 56.
, The shaft 19 is prevented from coming off.

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

A pressing spring 24 is mounted between the bearings 18 and 23a to urge the support plate 23 upward in FIG.

On one side of the support plate 23, a tension spring is provided between the support plate 23 and the chassis a.
25 is mounted and urges the side of the supporting plate 23 downward, and the supporting plate 23 is opposed to the tension spring 25 about the shaft 19,
You can exercise like a seesaw.

A contact piece 23b is attached to one end of the side of the support plate 23 which is urged downward, and the contact piece 23b is urged by a tension spring 25 as shown in FIG. Stop plate 15
Of the push-up cam 15c.

Therefore, as the locking plate 15 moves, the support plate 23 moves in a seesaw shape as described above. Here, the push-up cam 15c is made from the horizontal section 15c ₂ and the inclined portion 15c ₃ and the inclined portion 15c ₁ as shown in FIG. 5 (b). In particular, there is the horizontal section 15c ₂ and the height thereof height to level the support plate 23.

Also, a motor 26 is attached to this support plate 23,
A gear 27 driven from the pulley 26a via an interlocking mechanism
Then, the rack 21a of the mounting body 21 is engaged with the mounting body 21, and the rotation of the motor 26 guides the mounting body 21 to the guide shaft 22, thereby performing a linear motion.

Further, on the support plate 23, as shown in FIG.
a is rotatably mounted and the long hole 28b of the rotating plate 28 is fixed to the support plate 23 with a screw 23c, whereby the rotating of the rotating plate 28 is prevented.

A concave portion 28c is provided at the tip of the rotating plate 28, and the support plate 23
The protrusion 29a of the rotating piece 29 rotatably attached to the groove 28 is inserted into the recess 28c.

Accordingly, when the screw 23c is warmed and the rotating piece 29 is rotated, the recess 28c is pushed by the protruding piece 29a, and the rotating plate 28 is rotated, and the screw is rotated.
By tightening 23c, the rotating plate 28 is fixed at that position.

A projection 28d is formed at the other end of the rotating plate 28, and the projection 28d is in contact with a contact piece 30 fixed to the chassis a by the urging of the pressing spring 24.

Accordingly, when the rotating plate 28 rotates to the imaginary line in the drawing as described above, the support plate 23 is moved to the position of the imaginary line against the urging of the pressing spring 24.

Thus, the center of the turntable 32 attached to the spindle motor 31 is aligned with the optical pickup 20.
The support plate 23 can be adjusted such that the optical axis moves.

On the other hand, as shown in FIGS. 17 to 20, a concave portion 33b is provided on the upper surface of the auxiliary mounting plate 33 on which a slide piece 33a that slides along one side 23d of the support plate 23 is provided.
The concave portion 33b is pressed against the protrusion 21b projecting from the lower surface of the mounting body 21 by the urging force of the pressing spring 34 provided between the screw 33c erected in 3 and the mounting body 21.

Therefore, the auxiliary mounting plate 33 projects
It can move like a seesaw around the contact point between 21b and recess 33b.

Then, a screw is inserted into the auxiliary mounting plate 33 through the mounting body 21.
33d is screwed.

Therefore, if this screw 33d is tightened, the auxiliary mounting plate 33
The compression spring 34 is compressed as described above, and as shown in FIG. 19, the side of the screw 33d rises around the recess 33b, and the side of the slide piece 33a moves downward so as to rotate. That is, in FIG. 18, the auxiliary mounting plate 33 rotates counterclockwise.

By the way, as shown in FIG. 20, the slide piece 33a
The support plate 23 has a shape such that vertical movement is restricted with respect to one side 23d.

Therefore, as described above, when the screw 33d is tightened, the slide piece 33a attempts to rotate so that the side thereof is lowered,
On the contrary, the mounting piece 21 is lifted up using the slide piece 33a as a fulcrum without lowering the slide piece 33a.

Thus, when the screw 33d is tightened, the mounting body 21 rotates about the guide shaft 22.

When loosening the screw 33d, the operation principle is the same except that the rotation direction of the auxiliary mounting plate 33 is reversed, and the mounting body 33 is rotated in the opposite direction by the urging of the push spring 34, contrary to the above. Mounting body 21
This side of the go down.

That is, if the screw 33d is adjusted so that the amount of rotation between the auxiliary mounting plate 33 and the mounting body 21 is increased, the mounting body 21 is adjusted so as to lift upward with the slide piece 33a as a fulcrum,
Conversely, if the screw 33d is adjusted so that the amount of rotation between the auxiliary mounting plate 33 and the mounting body 21 is reduced, the mounting body 21 is adjusted so as to fall downward with the slide piece 33a as a fulcrum.

Therefore, the mounting body 21 rotates around the guide shaft 22, and the optical axis of the optical pickup 20 mounted on the mounting body 21 is set in the moving direction of the optical pickup 20 with respect to the optical disc b. It can be adjusted to tilt in the right angle direction.

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

As shown in Fig. 13, two cam pieces 21
c, 21d, and the cam piece 21
c, the actuating piece 35, 36 and the switch Sw ₁ is moved to 21d, Sw ₂ is attached to the operating piece 35 and 36, spring 37 and 38 pull away from the switch Sw _1, Sw ₂ is mounted I have.

When the optical axis of the optical pickup 20 is moved to a position III about 37 mm away from the center position I of the turntable 32, the switch Sw ₁ causes the operating piece 35 to be attached with a tension spring 37, as shown in FIG. O by being pushed by the cam piece 21c against the force
N state.

The switch Sw ₂ is pushed by the operating piece 36 by the cam piece 21 d pushing the operating piece 36 against the tension spring 38 at the II position where the optical axis of the optical pickup 20 is about 26 mm away from the I position, Turns on.

And at the IV position 55 mm away from the I position, the cam piece 21d
There order away from the operation piece 36, the actuating piece 36 is rotated by the force of the tension spring 38, the switch Sw ₂ is turned OFF.

The pickup 20 has its optical axis suspended at a V position 63 mm away from the I position.

Further, on one side of the chassis a, a clamper mounting plate 39 is rotatably mounted by a shaft 40 as shown in FIGS. 2 and 3, and between the clamper mounting plate 39 and the arm plate 13. Is provided with a tension spring 41.
The protrusion 13c of the arm plate 13 shown in the figure is in contact with the protrusion 39g of the clamper mounting plate 39.

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

At the tip of the clamper mounting plate 39, a concave portion 39a is formed, and the concave portion 39a and the clamper 42 are
It is rotatably in contact.

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

In the clamper housing 44, the protrusion 44a is inserted into the concave portion 39b of the clamper mounting plate 39, and the ridge 44b is inserted into the concave portion 39c from below the clamper mounting plate 39. , Cannot be moved in the direction of arrow A.

Opposite concave portions 44c are formed on left and right inner surfaces perpendicular to a line connecting the protrusions 44a and the ridges 44b of the clamper container 44, and the concave portions 44c are provided on the right and left sides of the clamper support 45. Protruding pin 45a is inserted.

A shaft 45b provided at the base end of the clamper support 45
Is inserted into the concave portion 39d of the clamper mounting plate 39, and the protrusion 46a of the washer 46 fixed by the screw 39e screwed to the clamper mounting plate 39 prevents the shaft portion 45b from being pulled out of the concave portion 39d.

The clamper support 45 has screws on the clamper mounting plate 39.
One end of the spring plate 47 fixed at 39e is pressed against and urges the protruding pin 45a downward.

Further, an L-shaped projecting wall 44 is provided before and after the clamper housing 44.
The protrusion 13d of the arm plate 13 is inserted between them so as to prevent the clamper housing 44 from moving in the direction of arrow B.

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

The clamper container 44 is, as described above, a clamper support 45.
Therefore, the clamper housing 44 and the clamper 42 housed in the clamper housing 44 are kept horizontal when ascending.

Further, as shown in FIGS. 5 and 22 to 25, the chassis a
, Three switches Sw ₃ , Sw ₄ , Sw ₅ are attached, and each switch Sw ₃ , Sw ₄ , Sw ₅ is provided with an operation piece 48, 49, 50 for turning on / off the switch. .

Then, on the lower surface of the cam gear 3, the large diameter portion 3c _1, 3d ₁ and the small-diameter portion 3c _2, 3d ₂ and two cam grooves 3c obtained by connecting, 3d are formed.

A pin 51a is pivotally supported by the chassis a, and the pressing portion 51b is
The pin 51c of the lever 51 that pushes the button 48 is inserted into the cam groove 3c, the pin 52a is pivotally supported by the chassis a, and the pin 52c of the lever 52 that presses the operation piece 49 by the pressing portion 52b is inserted into the cam groove 3d.

Therefore, the pin 51c reaches the small-diameter portion 3c _2, the lever 51 is rotated, the pressing portion 51b presses the operation piece 48, the switch S
The w ₃ ON Suruga, reaches the small-diameter portion 3c ₁ lever 51 is rotated in the opposite direction, since the pressing portion 51b is separated from the operating piece 48, the switch Sw ₃ is turned OFF.

Similarly, the switch Sw ₄ is also turned ON at the large-diameter portion 3d _1, the OFF small diameter portion 3d _2.

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

Accordingly, the lever 53 by the locking plate 15 is moved in the vertical direction of Figure 25 is rotated, pushing the pressing part 53b is the operation piece 50, or away, it is intended to ON · OFF switch Sw _5.

Further, the mounting body 21 of the optical pickup 20 includes:
Optical pickup as shown in Figs. 13 to 16 and Fig. 27
The tilt sensor 54 is attached at a tilt of 15 degrees from the position 20 perpendicular to the moving direction to a position on the side of the center I of the 1.29 mm turntable 32.

The tilt sensor 54 includes a light emitter 54a and light receivers 54b and 54c on both sides of the light emitter 54a.
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 that the tilt of the optical disc b is detected.

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

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

In this state, when a 30 cm or 25 cm diameter video disc, 12 cm video or digital audio disc is placed on the tray 10 and a playback command is given to play these discs b, the motor 1 Is rotated.

When the cam gear 3 is rotated in the direction of arrow D in FIG. 8 by this rotation, the toothless gear 4 integral with the cam gear 3 is rotated, and the vertically long gear 5 meshing with the gear is driven.

Since the rack 10d of the tray 10 is meshed with the vertical gear 5, the tray 10 is provided with the rollers 8A, 8B, 9A, 9
Guide grooves 10a and 10b are guided by B, and rollers of chassis a
11, the guide groove 10c is guided by the roller 13A of the arm plate 13, and moves as shown in FIG. 6 (a) and FIG.

Then, the end of the guide groove 10a reaches the rollers 8A and 9A, and the upper surface opening of the end of the guide groove 10c reaches the roller 11. That is, the tray 10 is pulled into the playback device as shown in FIG.

In this way, when the pull-in of the tray 10 is completed,
Due to the missing tooth portion of the toothless gear 4, the driving of the vertically long gear 5 is stopped, and the tray 10 stops at that position.

At this time, the rotation of the cam gear 3, the pin 52c that has been in the small-diameter portion 3d ₁ moves to the large diameter portion 3d _2, the switch Sw ₄ as Figure 26 is turned ON, the motor 1 begins to rotate Is detected.

At the time of ejection, at the end, switch
Since Sw ₄ is turned off, the motor 1 is stopped, and the eject operation is completed.

As described above, before the tray 10 is pulled to the position of FIG. 6 (a), the arc-shaped portion 3b ₁ of the cam groove 3b is retaining plate 15
After passing through the position of the pin 15b, the cam portion 3b ₃ starts to contact the pin 15b, so that the locking plate 15 is moved to the position shown in FIG.
Move to the right, release the locking of the arm 6b, and
Slide is allowed.

Thus, when the locking plate 15 moves rightward, the cam groove 15
d, switch Sw ₅ is turned off by lever 53 as shown in FIG. 26
And the completion of the horizontal movement of the tray 10 is detected.

Before the locking plate 15 moves as shown in FIG. 5 and the locking of the arm portion 6b by the locking plate 15 is released, the pin 3a of the cam gear 3 enters the Y-shaped groove 6c.

Then, the locking of the arm 6b by the locking plate 15 is released, the pin 15b reaches the arcuate portion 3b ₂ , and when the locking plate 15 is held at that position, the groove 6c is pushed by the pin 3d and slides. Plate 6 is the seventh
As shown in FIG. 6A, it is moved to the left with respect to FIG.

Therefore, the pin 7a is guided by the cam hole 6a of the slide plate 6, the elevating plate 7 descends, and the tray 10 in which the guide grooves 10a, 10b are inserted into the rollers 8A, 8B, 9A, 9B also descends. try to.

At this time, since the upper surface opening at 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 upper surface opening.

When the elevating plate 7 is lowered, the arm plate 13 in which the pin 13b is inserted into the connection hole 7b rotates in the direction of lowering the tip because the pin 13b moves down together with the elevating plate 7.

Accordingly, the roller 13A of the arm plate 13 also descends by the same amount as the descending amount of the elevating plate 7, and pushes down the guide groove 10c, so that the roller 11A
, And this side of the tray 10 is also lowered.

As the tray 10 descends, the disk b placed thereon is transferred onto the turntable 32.

On the other hand, as the locking plate 15 moves as shown in FIG. 5, the lower portion 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 descends once as shown in FIG. .

Thus, the lowering of the elevating plate 7 by the movement of the slide plate 6 is completed, retaining plate 15 starts moving in the opposite direction again by the cam portion 3b _4, the switch Sw ₅ is turns ON, the lifting plate 7 Completion of the descending operation is detected.

The downward rotation of the distal end of the arm plate 13 causes the tension spring 41 to rotate the clamper mounting plate 39 such that the distal end thereof is lowered.

Therefore, as described above, the clamper 42, which has been kept horizontal when ascending, is placed on the disk b transferred on the turntable 32 as it is.

Then, the tip of the arm plate 13 still continues to descend, but the clamper 42 rotates the clamper support 45 by the bias of the spring plate 47, and extends the tension spring 41,
No further descending.

Thus, 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 lifting plate 7 means the detection of the completion of the clamper.

As described above, the horizontal support of the tray 10 during the horizontal movement is performed by the four rollers 8A, 8B, 11, and 13A, while the vertical movement is supported by the three rollers 8A, 8B, and 13A. Become.

Also, if the arm plate 13 is twisted due to some resistance or variation in dimensions, etc., the height of the rollers 8A, 8B on one side and the roller 13A on the other side will be out of order, and the height of the tray 10 will be inclined. There is a fear.

Then, the guide grooves 10a, 10b, 10c are moved by the rollers 8A, 8B, 9A, 9B, 1
With respect to 3A, the angle becomes as shown in FIG. 12, and rollers 8A, 8B,
When 9A, 9B and 13A are cylindrical, these are the guide grooves 1
Bites 0a, 10b, and 10c are deformed, and the sliding is not performed smoothly.

To prevent such a situation, the rollers 8A, 8B, 9A, 9B,
11 and 13A, as shown in FIGS. 11 and 12, have a spherical shape with an enormous tip to prevent biting into the guide grooves 10a, 10b and 10c as described above.

Thus, the transfer of the disk b to the turntable 32,
After the clamp by the clamper 42 is completed, the cam gear 3 continues to rotate, the pin 15b reaches the cam 3b ₄ of the cam groove 3b, and the locking plate 15
Is moved toward the left side in FIG. 5, and the arm 6b is locked to prevent the slide plate 6 from moving.

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

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.

When the intermediate portion of the cam portion 3b ₄ of the cam groove 3b reaches the position of the pin 15b, as shown in FIG.
reaches the small diameter portion 3d ₂ of d, the switch Sw ₄ is turned OFF.

The horizontal portion 15c ₂ of the lifting cam 15c reaches the contact piece 23b,
When the motor 23 is detected to be substantially horizontal with the shaft 19 as a center, the motor 1 is stopped. If, like the motor overruns, when the contact piece 23b is beyond the horizontal portion 15c _2, lever 53 pin 53c is moved by the cam groove 15d is to turn off the switch Sw _5. That is, support plate 23 at a position switch Sw ₅ is on the switch Sw ₄ is OFF 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 Sw ₁ and Sw ₂ are OFF as shown in FIG.

FIG. 29 is a block diagram of a circuit for controlling the rotation of the motor 26 and the reproduction output PO of the optical pickup 20 by the switches Sw ₁ and Sw ₂ and the focus signal FS of the optical pickup 20. Shown in the figure.

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

As described above, when the setting of the disc b is completed and the switches Sw ₁ and Sw ₂ are OFF, as shown in FIG. 30, as a step S ₁ , the optical pickup 20 obtains the focus by the reflection of the disc b. And

At this time, the disc b is not set or the diameter is 12cm
Alternatively, in the case of an 8 cm disk, the light is not reflected at the V position, so that the focus signal FS cannot be obtained.

In the case of a video disc b having a diameter of 20 cm or 30 cm,
Since the focus signal FS is obtained, as a step S _2,
Switch Sw ₂ is moved to the IV position NO.

The disc b, and at a radius of about 55mm of the IV position, because TOC information is recorded, the optical pickup 20 reads the TOC information, in step S _3, to reproduce the disc b.

When this reproduction end, if there is a next reproduction instruction is a step 4, in step S ₄ in accordance with the reproduction instruction, the process returns to step S _3, reproduces the disc b.

However, when there is no playback directive, as a step S _5,
Via IV position, returns to the V position as step S _6.

In step S ₁ described above, when the focus signal FS is not obtained, and once ON Step S ₇ switches
It is sent to the II position where Sw ₂ turns off again.

Then, operates to obtain again the focus signal FS in step S _8, when no focus signal FS can be obtained even in this case, as the disk b is not set, the process proceeds to step S _5.

However, when the focus signal FS is obtained at this position, it is assumed that a disk having a diameter of 12 cm or 8 cm is set, and the TOC information of the digital audio disk recorded at a position of a radius of about 26 mm, which is the II position, is obtained. read as a step S _9.

Then, when the information is read, as the disc b, Step S _10, the reproduction is performed.

When the reproduction is completed, in step S _14, when there is a next reproduction instruction in accordance with the reproduction command, step
Return to S _13, but if no regeneration command, the process returns to step S _5.

However, in the CDV (pictorial compact disk), read the TOC information of the II position, switch SW ₄ is moved to the III position ON in step S _12, step S
The reproduction is performed as ₁₁ .

Then, when the playback of the video portion is completed, step S
In _12, the process proceeds to step S _13, in which audio reproduction is performed.

In this way, the playback of the disc b is performed. 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. According to the direction of the inclination, the rotation is made forward or reverse.

Then, since the locking plate 15 moves according to the rotation,
The amount by which the contact piece 23b is pushed up by the push-up cam 15c changes about the position VI in FIG. 26, and the support plate 23 is inclined about the shaft 19.

When the inclination of the support plate 23 coincides with the inclination of the disk b, and the two become parallel, and the light receiving amounts of the photoreceptors 54b and 54c become the same, the motor 1 stops.

Thus, the tilt adjustment of the optical pickup 20 is performed.

The line Y connecting the light receiving bodies 54b and 54c and the light emitting body 54a of the tilt sensor 54 is, as shown in FIG.
Is mounted at an angle of 15 degrees with respect to the movement line Z of the optical axis.

This angle is different from the movement line Z in FIG.
b, 54c, when the line X connecting the light emitter 54a is parallel, the diameter is 30cm
Angle with the line Z when playing the innermost circumference 55mm of the disc b
This is based on an intermediate point between 21.4 degrees and an angle of 8 degrees when reproducing the outermost 147 mm, that is, (8 + 21.4) /2=14.7＝15.

1.29 ≒ 3 mm from the optical axis VII of the optical pickup 20
The reason for shifting inward is that when the optical axis VII is at the outermost circumference 147 mm,
The center of the tilt sensor 54 is from the center I of the turntable 32
It is intended to be at a position of 147 mm.

When the warp angle θ _T of the disk b at this time is set to 2
Degrees, the detection angle θ _L of the tilt sensor 54 is 30 th
As shown in the figure According to the following equation, θ _L = 2.020 degrees on the circumference and 2.0 _{L on} the outer circumference
13 degrees.

Therefore, the difference θ _T −θ _{L from} the actual warp angle θ _T is 0.
At 02 degrees, it is improved by 0.128 degrees compared to the conventional 0.148 degrees.

〔The invention's effect〕

As described above, in the present invention, the auxiliary mounting plate is pivotally supported by the mounting body, and if the distance between the auxiliary mounting plate and the mounting body is changed by adjusting the adjusting means on one side thereof, the auxiliary mounting plate can be pivotally supported. Lean as center.

Therefore, the side of the mounting body moves up and down according to the inclination of the auxiliary mounting plate, so that the mounting body rotates about the guide axis, and the optical axis of the optical pickup is perpendicular to the plane orthogonal to the guide axis. Can be adjusted.

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

Further, since this adjusting means can be provided at a position separated in the guide axis direction instead of the side of the optical pickup as in the related art, the adjusting means is provided outside the outer diameter of the optical disc set on the turntable. It is possible to

Therefore, the tangential operation of the optical pickup can be facilitated by the fact that the adjustment can be performed by setting the optical disc and the ease of the adjustment.

[Brief description of the drawings]

1 to 30 show an optical disc reproducing apparatus according to the present invention. FIG. 1 is a plan view of the entirety, FIG. 2 is a plan view of the case with its case removed, and FIG. 4 is an overall front view, FIG. 5 (a) is a plan view of a loading drive unit, FIG. 5 (b) is a cross-sectional view of the push-up cam in the same drawing, FIG. 6 (a) FIGS. 7 (a) and 7 (b) and FIGS. 7 (a) and 7 (b) are side views showing the operation of the elevating plate, FIGS. 8 to 10 are plan views showing the operations of the loading drive unit and the tray, FIGS. FIG. 12 is a front view showing the relationship between the guide grooves and rollers of the tray, FIG. 13 is a plan view of the optical pickup operation unit, FIGS. 14 and 15 are side views showing the tilt operation thereof, and FIG. FIG. 17 is a side view showing adjustment of a moving axis of the optical pickup, FIG. 17 is a plan view of a tangential adjustment unit of the optical pickup, FIG. And FIG. 19 is a side view showing the adjustment, FIG. 20 is a front view thereof, FIG. 21 is an exploded perspective view of the clamper portion, and FIGS. 22 to 25 are plan views showing operation states of the switch by rotation of the cam gear. FIG. 26 is a diagram showing the detection of the operation state of each part by the operation of the switch. FIG. 27 is a plan view showing the operation dimensions and angles of the tilt sensor. FIG. 28 is a diagram showing the position of the optical pickup and the position of the switch. FIG. 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 adjusting device, and FIG. 32 is a front view thereof. is there. a ... chassis, b ... optical disk, 20 ... optical pickup, 21 ... mounting body, 21b ... protrusion, 22 ... guide shaft, 23 ... support plate, 23d ... one side, 31 ... ... Spindle motor, 32 ... Turntable, 33 ... Auxiliary mounting plate, 33
a… Slide piece, 33b… Recess, 33c, 33d… Screw, 34
...... Press spring.

Claims (1)

(57) [Claims] 1. An optical disc reproducing apparatus in which a guide shaft of an optical pickup extends in substantially the same direction as a direction in which a disc is ejected and stored, wherein an optical pickup is mounted and guided by the guide shaft. And an attachment body that slides around the guide shaft and is rotatable about the guide shaft, and the attachment body is rotated about a direction substantially perpendicular to the direction in which the disc is ejected and stored against the elastic force. Pivoted to
An auxiliary mounting plate having a slide piece that slides on a support plate; and an auxiliary mounting plate provided on the auxiliary mounting plate outside an outer diameter of a disk set on a turntable, and a rotation amount of the mounting body with respect to the auxiliary mounting plate. Adjusting means for adjusting the optical axis of the optical pickup by adjusting the amount of rotation by the adjusting means with the slide piece as a fulcrum. A pickup optical axis adjusting device, characterized in that: