JPH06105502B2 - Pickup optical axis adjustment device for optical disc player - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an optical disc reproducing apparatus for reproducing a signal of an optical disc such as an optical video disc and a digital audio disc, and a straight line passing through the center of a turntable. And an optical axis adjusting device for an optical pickup for matching a straight line passing through an optical axis of an optical pickup for reading a signal.

[Conventional technology]

In this type of conventional pickup optical adjustment device,
The spindle motor to which the turntable was attached was moved and fixed so that the center of the turntable was located on the extension of the moving straight line of the optical axis of the pickup.

As another means, the optical pickup is fixed to the support member by moving in a direction perpendicular to the guide shaft so that the optical axis of the optical pickup is on the center line of the turntable.

[Problems to be Solved by the Invention]

In this type of pickup optical axis adjustment device, if the spindle motor or the pickup is loosened, these will move freely and it will not be known to what extent they have been moved.

In addition, since it is difficult to make a slight movement, the adjustment work is difficult.

Since this adjustment is performed after assembling the optical disc reproducing apparatus, it is difficult to loosen or tighten the mounting screws of the spindle motor and the optical pickup, and the adjustment may change the grating. was there.

[Object of the Invention]

The present invention solves the above-mentioned problems of the adjustment of the optical axis of the pickup of the conventional optical disc reproducing apparatus, enables fine adjustment, and enables optical adjustment without loosening the mounting screw of the spindle motor or the optical pickup. It is an object of the present invention to facilitate the operation even after the disc reproducing apparatus is assembled.

[Outline of Invention]

In order to achieve the above object, the present invention provides a chassis supporting a spindle motor, a shaft rotatably supported in a tilt adjustable direction with respect to a shaft fixed to the chassis, and a guide shaft. An optical disc reproducing apparatus having a support plate to which an optical pickup that moves in the radial direction of the disc is attached, the support plate pivotally supported by the shaft is also supported in the axial direction. Urging means for slidably supporting the support plate slidably in the axial direction toward one side in the axial direction, and rotatably mounted on the support plate, and , Optical axis adjusting means for moving the support plate in the direction opposite to the urging direction of the urging means by pushing the chassis with its rotating tip end, By rotating the axis adjusting means, The center of the optical axis of the Kkuappu is obtained by an adjustable to match the center line of the turntable.

Example of Invention

Next, an example of implementation of the present invention, diameter 30 cm, 20 cm, 12 cm,
An optical disc reproducing device capable of reproducing any of the 8 cm optical discs will be described below.

In FIG. 5, reference numeral 1 denotes a motor attached to the chassis a. A cam gear 3 meshes with a gear 2 rotated from the motor 1 via a reduction mechanism, and a gear tooth gear 4 integrated with the cam gear 3 meshes with the toothless gear 4. The vertical gear 5 having longitudinal teeth is driven by the interlocking gear.

In FIG. 6 (a), 6 is a slide plate supported by the chassis a so as to be movable only in the left-right direction, and has a cam hole.
A pin 7a of an elevating plate 7 which is supported by the chassis a so as to be movable only in the vertical direction is inserted into the 6a.

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

As shown in FIG. 3, two rollers 8A and 8B that are horizontally supported, and two rollers 8A and 8B that are vertically supported at the same position in the front-rear direction as the rollers 8A and 8B. Two rollers 9A, 9
B is installed.

The rollers 8A and 8B have guide grooves 10a formed on one side surface 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 groove 10a. The guide groove 10b on the bottom is fitted.

Therefore, in the tray 10, the guide grooves 10a and 10b have rollers 8A,
Guided by 8B, 9A, 9B, the 4th
It can be moved forward and backward in the figure.

On the other side of this tray 10, FIG. 6 (b) and FIG. 7 (b)
As described above, a guide groove 10c that is open upward at one end is provided, and in this guide groove 10c, a roller 11 axially supported by the chassis a and a shaft 12 of the chassis a are axially supported. A roller 13A that is horizontally supported is inserted in the arm plate 13.

Therefore, the tip of the arm plate 13 is in the raised position and the rollers 11, 1
When 3A is in the same horizontal position, the tray 10 can move in the horizontal direction of FIG. 4 as described above.

Then, when the tray 10 moves to the end and the roller 11 and the upper surface opening of one end of the guide groove 10c coincide with each other, and the arm plate 13 rotates about the shaft 12, the roller 11 moves to the guide groove 10c.
The tray 10 can be lowered by pulling out from the upper opening of the tray.

A pin 13b is erected on the arm plate 13 and is inserted into the connecting hole 7b of the lift plate 7.
The arm plate 13 is rotated in accordance with the elevation of.

As shown in FIG. 4, the vertically long gear 5 is rotatably attached to a shaft 7c provided on the elevating plate 7, and the chassis a
The longitudinal gear 5 moves up and down while being supported by the shaft 14 and the shaft 7d.

Therefore, the vertically long gear 5 is not disengaged with the gear that drives the vertically long gear 5 even if the lifting plate 7 moves up and down.
It will always mesh with the rack 10d of the tray 10 that moves up and down together.

Further, as shown in FIG. 5, the arm portion 6b of the slide plate 6 is provided with a Y-shaped groove 6c, and the pin 3a projecting on the upper surface of the cam gear 3 is formed by the Y-shaped enlarged end portion of the groove 6c. After entering the groove 6c into the groove 6c and pushing the groove 6c to move the slide plate 6, the slide plate 6 is pulled out from the Y-shaped tip enlarged portion of the groove 6c.

On the upper surface of the cam gear 3, the two arcuate portions 3b ₁ around its center, 3b _2, the cam portion 3 connecting the circular arc-shaped portion 3b ₁ and 3b ₂
b ₃ and the cam portion 3 facing the outer diameter side from the arcuate portion 3b ₂
A cam groove 3b made of b ₄ is bored.

Then, the pin 16A of the chassis a, the guide groove portion 16B, and the guide hole 15a are guided, and the pin 15b protrudingly provided on the lower surface of the locking plate 15 which moves linearly is inserted into the cam groove 3b.

Therefore, when the pin 15b is at the arcuate portion 3b ₁ of the cam groove 3b is
Locking plate 15 also is cam gear 3 rotates is not moving, the pin 15b reaches the cam portion 3b _3, retaining plate 15 in accordance with rotation of the cam gear 3, is moved to the right in Figure 5 It becomes a state.

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 arcuate portion the pin 15b is 3b ₁ and the cam portion 3b ₄
At the end of, when the locking plate 15 is moving to the left,
As shown in FIGS. 8 and 10, the distal end of the arm portion of the slide plate 6
The slide plate is prevented from sliding by contacting the end face of 6b.

Then, the pin 15b is in the arcuate portion 3b _2, retaining plate 15 when moving to the right as FIG. 9, the movement preventing the arm portion 6b is released.

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

A tension spring 17 is installed between the locking plate 15 and the guide portion 16B to urge the locking plate 15 to the right in FIG.

Further, as shown in FIGS. 13 to 15, a guide shaft 22 for guiding the mounting body 21 of the optical pickup 20 is provided on a shaft 19 supported by two bearings 18 having an open upper surface of the chassis a. 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 and then inserting the shaft 19 into the bearing 18 from above, the support plate 23 is axially supported by the chassis a,
If the stopper plate 55 for fixing the upper surface of the shaft 19 is fixed to the chassis a with the screw 56, the shaft 19 is prevented from being pulled out.

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

A push spring 24 is mounted between the bearings 18 and 23a and urges the support plate 23 upward in FIG.

On one side of the support plate 23, a tension spring 25 is provided between the support plate 23 and the chassis a.
Is mounted to urge the side of the support plate 23 downward, and the support plate 23 can move in a seesaw-like manner about the shaft 19 against the tension spring 25.

A contact piece 23b is attached to one end of the supporting plate 23 that is biased downward, and the contact piece 23b is a tension spring.
The urging force of 25 pushes the push-up cam 15c of the locking plate 15 as shown in FIG.

Therefore, as the locking plate 15 moves, the support plate 23 makes a seesaw-like motion 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, the height of the horizontal portion 15c ₂ is set to the height that makes the support plate 23 horizontal.

Further, a motor 26 is attached to the support plate 23, and a gear 27 driven from its pulley 26a through an interlocking mechanism.
Then, the rack 21a of the mounting body 21 meshes with each other, and the mounting body 21 is guided by the guide shaft 22 by the rotation of the motor 26 to make a linear motion.

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

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

Therefore, if the screw 23c is loosened and the rotating piece 29 is rotated, the concave portion 28c is pushed by the protruding piece 29a and the rotating plate 28 is rotated, and the screw 23c is rotated.
When c is tightened, the rotating plate 28 is fixed at that position.

A projecting portion 28d is formed at the other end of the rotating plate 28, and the projecting portion 28d is in contact with the contact piece 30 fixed to the chassis a by the urging force of the pushing 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 of the imaginary line against the bias of the push spring 24.

Thus, 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, a recess 33b is provided on the upper surface of the auxiliary mounting plate 33 to which a slide piece 33a that slides along one side 23d of the support plate 23 is mounted, and the auxiliary mounting plate 3 is provided.
The recess 33b is pressed against the projection 21b projecting from the lower surface of the mounting body 21 by the urging force of the push spring 34 that is installed between the screw 33c standing upright in 3 and the mounting body 21.

Therefore, the auxiliary mounting plate 33 resists the push spring 34 and thus the protrusion 21.
It can move like a seesaw around the contact point between b and the recess 33b.

Then, the auxiliary mounting plate 33 penetrates the mounting body 21 and screws 33
d is screwed.

Therefore, when the screw 33d is tightened, the auxiliary mounting plate 33 compresses the pushing spring 34 as described above and rotates as shown in FIG. 19 to lift this side of the mounting body 21.

On the contrary, when the screw 33d is loosened, the mounting plate 33 is rotated in the opposite direction by the urging force of the pressing spring 34, and this side of the mounting body 21 is lowered.

Therefore, the mounting body 21 rotates about the guide shaft 22,
Optical pickup attached to this mount 21
It is possible to adjust that the optical axis of 20 is inclined with respect to the optical disc b in the direction perpendicular to the moving direction of the optical pickup 20.

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

As shown in FIG. 13, two cam pieces 21c,
21d is provided, and the cam piece 21c, 2c is provided on the chassis a.
Actuating pieces 35, 36 that are moved to 1d and switches Sw ₁ , Sw ₂ are attached, and tension springs 37, 38 are mounted on the operating pieces 35, 36 in a direction away from the switches Sw ₁ , Sw ₂ .

The switch Sw ₁ is located at about 3 degrees from the center position I of the turntable 32.
When the optical axis of the optical pickup 20 moves to the position III at a distance of 7 mm, the operating piece 35 moves the tension spring 37 as shown in FIG. 28.
It is turned on by being pushed by the cam piece 21c against the bias of.

The switch Sw ₂ is turned on when the optical axis of the optical pickup 20 is at III, which is about 26 mm away from the I position, and the cam piece 21d pushes the operating piece 36 against the tension spring 38 to push the operating piece 36.
It becomes a state.

Then, at the IV position 55 mm away from the I position, the cam piece 21d is separated from the operating piece 36, so that the operating piece 36 is rotated by the force of the tension spring 38, and the switch Sw ₂ is turned off.

Further, the pickup 20 has its optical axis stopped waiting at the V position 63 mm away from the I position.

Further, as shown in FIGS. 2 and 3, a clamper mounting plate 39 is rotatably mounted on one side of the chassis a by a shaft 40, and between the clamper mounting plate 39 and the arm plate 13. A tension spring 41 is installed, and the urging force of the tension spring 41 causes the protrusion 13c of the arm plate 13 and the protrusion 3 of the clamper mounting plate 39 shown in FIG.
9g is in contact.

Therefore, when the tip of the arm plate 13 is lowered, the clamper mounting plate 39 is also pulled by the tension spring 41, and the tip is also lowered, but when the tip of the arm plate 13 is raised, 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,
The recess 39a and the clamper 42 are rotatably in contact with each other via a ball 43.

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

In this clamper container 44, the protrusion 44a is inserted into the recess 39b of the clamper mounting plate 39 and the protrusion 44b is inserted into the recess 39c from the lower side of the clamper mounting plate 39, and the clamper container 44 is attached to the clamper mounting plate 39. , And cannot move in the direction of arrow A.

Further, opposed recesses 44c are formed on the left and right inner surfaces of the clamper housing 44 that are orthogonal to the line connecting the projections 44a and the ridges 44b, and the recesses 44c are provided on the left and right of the clamper support body 45 so as to project. The protruding pin 45a is inserted.

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

This clamper support 45 has screws 39 on the clamper mounting plate 39.
One end of the spring plate 47 fixed by e is pressed and the protruding pin 4
5a is urged downward.

Further, an L-shaped protruding wall 44d is provided in front of and behind the clamper housing 44.
Is formed, and the protrusion 13d of the arm plate 13 is inserted between them to prevent the clamper container 44 from moving in the direction of arrow B.

Then, when the arm plate 13 rises, the protrusion 13d becomes
The clamper housing 44 is raised at an angle parallel to the tip of the arm plate 13 by hitting the upper surface of the L-shaped 4d.

Since the clamper housing 44 is supported in parallel with the clamper support body 45 as described above, the clamper housing 44 and the clamper 42 housed therein are kept in a horizontal state when rising.

Further, as shown in FIGS. 5 and 22 to 25, three switches Sw ₃ , Sw ₄ , and Sw ₅ are attached to the chassis a, and each switch Sw ₃ , Sw ₄ , and Sw ₅ is respectively attached. The operation pieces 48, 49, 50 for turning this on and off are provided.

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.

The pin 51a is pivotally supported on the chassis a, and the pressing portion 51b is the operation piece 48.
The pin 51c of the lever 51 that presses is inserted into the cam groove 3c
The pin 52c of the lever 52, in which 2a is pivotally supported by the chassis a and the pressing portion 52b presses the operation piece 49, 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 Sw ₃
Is turned on, but when reaching the small diameter portion 3c ₁ , the lever 51 is rotated in the opposite direction, and the pressing portion 51b is separated from the operation piece 48, so the switch Sw ₃ is turned off.

Similarly, the switch Sw ₄ is turned on at the large diameter portion 3d ₁ and
It turns off at 3d ₂ .

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

Therefore, when the locking plate 15 moves in the vertical direction in FIG. 25, the lever 53 is rotated, and the pressing portion 53b pushes or releases the operation piece 50 to turn the switch Sw ₅ on and off.

Further, the mounting body 21 of the optical pickup 20 is
As shown in FIGS. 13 to 16 and 27, the optical pickup 20
On the other hand, the tilt sensor 54 is attached to the 1.29 mm turntable 32 inclined by 15 degrees from the position perpendicular to the moving direction to the position.

The tilt sensor 54 is provided with a light emitting body 54a and light emitting bodies 54b and 54c on both sides of the light emitting body 54a, and the light emitted from the light emitting body 54a is reflected by the optical disc b.

When the optical disc b is tilted with respect to the tilt sensor 54, a difference occurs in the amount of light received by the light receivers 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, and FIG.
This is shown in FIGS. 14, 14 and 22.

In this state, a video disc having a diameter of 30 cm, 25 cm, a video disc having a diameter of 12 cm, or a disc having a digital audio of 12 cm is placed on the tray 10, and when a reproduction command is given to reproduce 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 partly tooth-missing gear 4 integral with the cam gear 3 is rotated, and the longitudinal gear 5 in mesh with this is driven.

Since the rack 10d of the tray 10 is meshed with the vertically long gear 5, the tray 10 has the rollers 8A, 8B, 9A, 9B of the lifting plate 7.
Guide grooves 10a and 10b are guided to the roller 1 of chassis a.
1. While the guide groove 10c is guided by the roller 13A of the arm plate 13, the arm plate 13 moves as shown in FIGS. 6 (a) and 9.

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

Thus, when the tray 10 is completely pulled in, the drive of the longitudinal gear 5 is stopped by the toothless portion of the toothless gear 4, 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.

When ejecting, the switch Sw
_{Since 4} is turned off, the motor 1 is stopped and the eject operation is completed.

As described above, before the tray 10 is retracted to the position shown in FIG. 6 (a), the arcuate portion 3b ₁ of the cam groove 3b has finished passing the position of the pin 15b of the locking plate 15, and the cam portion 3b ₃ Starts to come into contact with the pin 15b, the locking plate 15 moves rightward to the position shown in FIG. 5, unlocking the arm 6b, and allowing the slide plate 6 to slide. .

Thus, when the locking plate 15 moves to the right, the cam groove 15
Switch Sw ₅ is turned off by lever 53, as shown in Fig. 26.
Then, 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 locking of the arm portion 6b by the locking plate 15 is released, the pin 3a of the cam gear 3 enters into the Y-shaped groove 6c.

Then, the locking of the arm portion 6b by the locking plate 15 is released, and the pin 6b
15b is reaches the arcuate portion 3b _2, the slide plate 6 the retaining plate 15 is held in that position the groove 6c is pushed by the pin 3d, as shown in FIG. 7 (a), Figure 6 Move to the left with respect to (a).

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 in the rollers 8A, 8B, 9A, 9B also descends together. try to.

At this time, since the groove 10c on the opposite side of the tray 10 has the upper surface opening at the end thereof at the position of the roller 11, the roller 11 can be removed from this upper surface opening.

The lowering of the elevating plate 7 causes the arm plate 13 having the pin 13b inserted into the connecting hole 7b to rotate in a direction in which the tip of the arm plate 13 is lowered because the pin 13b is lowered together with the elevating plate 7.

Therefore, the roller 13A of the arm plate 13 also descends by the same amount as the descending amount of the elevating plate 7, pushes down the guide groove 10c, pulls it out of the roller 11, and also lowers this side of the tray 10.

By the descent of the tray 10 as described above, the disk b placed on the tray 10 is transferred onto the turntable 2.

On the other hand, when 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 once descends as shown in FIG. .

In this way, when the lowering of the lifting plate 7 by the movement of the slide plate 6 is completed, the locking plate 15 starts moving in the opposite direction again by the cam portion 3b ₄ , and the switch Sw ₅ is turned on. Completion of the descending motion is detected.

The downward rotation of the tip of the arm plate 13 causes the tension spring 41 to rotate the clamper mounting plate 39 so that the tip thereof descends.

Therefore, as described above, the clamper 42, which was kept horizontal during the ascending, is placed on the disc 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 body 45 by the bias of the spring plate 47 and extends the tension spring 41, so that the clamper 42 does not descend further.

In this way, the clamper 42 presses the disk b against the turntable 32, 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 also means the detection of the completion of the clamper.

As described above, the horizontal support when the tray 10 is moved horizontally is performed by the four rollers 8A, 8B, 11 and 13A.
During the vertical movement, there are three rollers 8A, 8B and 13A.

Further, if the arm plate 13 is twisted due to some resistance or dimensional variation, the heights of the rollers 8A, 8B on one side and the rollers 13A on the other side are distorted, and the height of the tray 10 is inclined. There is a fear.

Then, the guide grooves 10a, 10b, 10c are aligned with the rollers 8A, 8B, 9A, 9B, 13A.
, The angle is as shown in Fig. 12, and the rollers 8A, 8B, 9
If A, 9B, and 13A are cylindrical, these are guide grooves 10
It bites into a, 10b, and 10c, deforms it, and the sliding is not performed smoothly.

In order to prevent such a situation, the rollers 8A, 8B, 9A, 9B, 1
As shown in FIGS. 11 and 12, 1, 13A have a spherical shape with a bulged tip to prevent the above-mentioned guide grooves 10a, 10b, 10c from being bitten.

Thus, the cam gear 3 continues to rotate even after the disc b is transferred to the turntable 32 and clamped by the clamper 42, the pin 15b reaches the cam portion 3b ₄ of the cam groove 3b, and the locking plate 15
Is moved to the left in FIG. 5 to lock the arm portion 6b to prevent the slide plate 6 from moving.

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

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

Then, when the middle portion of the cam portion 3b ₄ of the cam groove 3b reaches the position of the pin 15b, the pin 52c moves into the cam groove 3d as shown in FIG.
The switch Sw ₄ is turned off by reaching the small diameter part 3d ₂ of.

The horizontal portion 15c of the push-up cam 15c reaches the contact piece 23b, and the support plate 23
The motor 1 is stopped when it is detected that it has become substantially horizontal about the shaft 19. If the contact piece 23b moves over the horizontal portion 15c _{2 due} to overrun of the motor, the pin 53c is moved by the cam groove 15d, and the lever 53 turns off the switch Sw ₅ . That is, the support plate 23 is horizontal at the position where the switch Sw ₄ is off and the switch Sw ₅ is on.

At this time, the optical axis of the optical pickup 20 is at the V position 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 shows the switches Sw ₁ and Sw ₂ , the optical pickup
By the focus signal FS of 20, the rotation control of the motor 26,
FIG. 30 is a block diagram of a circuit for performing reproduction output PO of the optical pickup 20, and its flowchart is shown in FIG.

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, the switch b is set and the switch
When Sw ₁ and Sw ₂ are OFF, the optical pickup 20 tries to obtain the focus by the reflection of the disc b in step S ₁ as shown in FIG.

At this time, if the disk b is not set, or if the disk has a diameter of 12 cm or 8 cm, 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 20 cm and 30 cm, the focus signal FS is obtained, so that the switch Sw ₂ is moved to the IV position where it is turned on in step S ₂ .

This disc b has a radius of 55 mm at the IV position,
Optical pickup 20 because TOC information is recorded
Reads this TOC information, and in step S ₃ , reproduces the disc b.

At the end of this reproduction, if there is a next reproduction command as step 4, according to the reproduction command, as step S ₄ ,
Returning to step S ₃ , the disc b is reproduced.

However, when there is no playback command, in step S ₅ , IV
Position via returns to V position as step S _6.

If the focus signal FS is not obtained in step S ₁ described above, the switch Sw once turned on in step S ₇ is turned on.
₂ is sent to the II position where it 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 disc with a diameter of 12 cm or a diameter of 8 cm is set, and the TOC information of the digital audio disc recorded at the position of the radius of about 26 mm which is the II position is recorded. Read as step S ₉ .

When this information is read, the disc b
As, as a 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 S
Returning to step ₁₃ , however, if there is no reproduction command, the processing 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 ₁₁
As that play.

Then, when the reproduction of the video portion is finished, step S ₁₂
In, the process proceeds to step S _13, in which audio reproduction is performed.

In this way, the reproduction of the disc b is performed.
Tilt sensor 5 during playback of the LD or CDV video part
In No. 4, the inclination of the disk b is continuously removed, and when the inclination is detected, the motor 1 is rotated either forward or backward according to the direction of the inclination.

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 around the VI position in FIG. 26, and the support plate 23 is tilted around the shaft 19.

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

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

As shown in FIG. 27, the line Y connecting the light-receiving members 54b and 54c of the tilt sensor 54 and the light-emitting member 54a is attached at an angle of 15 degrees with respect to the moving line Z of the optical axis of the optical pickup 20. ing.

This angle is defined by the photodetectors 54b and 54c and the light emitter 54a with respect to the movement line Z.
If the line Y connecting the two is parallel, the angle 21.4 degrees with the line Z when reproducing the innermost 55 mm of the disk b having a diameter of 30 cm and the outermost circumference
When playing 147mm, it is halfway between the angle of 8 degrees, that is, (8 + 21.
4) /2=14.7≈15.

The optical pickup 20 is shifted inward by 1.29 from the optical axis VII because the center of the tilt sensor 54 is 147 mm from the center I of the turntable 32 when the optical axis VII is at the outermost circumference 147 mm.
It is intended to be in the position.

The detection angle θ _L of the tilt sensor 54 when the angle θ _T of the disc b set in this way is 2 degrees is According to the calculation, θ _L = 2.020 degrees on the circumference and 2.01
It will be 3 degrees.

Therefore, the difference θ _T −θ _{L from} the actual warp angle θ _T is 0.02 degrees at maximum, which is improved by 0.128 degrees as compared with 0.148 degrees of the conventional method.

〔The invention's effect〕

As described above, according to the present invention, by moving the optical axis adjusting means, the supporting plate on which the optical pickup is linearly movable is moved in the direction perpendicular to the moving direction to move the center of the turntable. It is possible to match the moving direction with the straight line passing through.

Therefore, when the optical axis adjusting means is constituted by a rotating plate having one point as a center, it is continuous and minute,
The adjustment can be made.

Further, since the optical axis adjusting means can be provided at a position apart from the optical pickup, the position can be easily adjusted even after assembly, and in combination with these, the adjustment work is smooth, Easily done.

Furthermore, since the support plate can be tilted like a seesaw around its axis, it can also be used as tilt adjusting means of the optical pickup.

Further, the urging of the supporting plate has an effect of suppressing the vibration when the vibration is transmitted to the supporting plate.

[Brief description of drawings]

1 to 30 show an optical disc reproducing apparatus according to the present invention. FIG. 1 is an overall plan view, FIG. 2 is a plan view with its case removed, and FIG. 3 is a clamper section. FIG. 4 is a front view of the whole, FIG. 5 (a) is a plan view of the loading drive unit, FIG. 5 (b) is a cross-sectional view of the push-up cam in the same figure, and FIG. ), (B) and FIGS. 7 (a), (b) are side views showing the operation of the lifting plate, and FIGS. 8-10 are plan views showing the operation of the loading drive unit and the tray, and FIG. FIG. 12 is a front view showing the relationship between the guide groove of the tray and the rollers, FIG. 13 is a plan view of the optical pickup operation section, FIGS. 14 and 15 are side views showing the tilting operation, and FIG. 16 is FIG. 17 is a side view showing the movement axis adjustment of the optical pickup, FIG. 17 is a plan view of the tangential adjustment section of the optical pickup, and FIG. And FIG. 19 is a side view showing the adjustment, FIG. 20 is a front view thereof, FIG. 22 is an exploded perspective view of the clamper portion, and FIGS. 22 to 25 are plan views showing the operating state of the switch by the rotation of the cam gear. Fig. 26 is a diagram showing the detection of the operating state of each part by the operation of the switch, Fig. 27 is a plan view showing the operating dimensions and angles of the tilt sensor, and Fig. 28 is the position of the optical pickup and the switch. FIG. 29 is a diagram showing an operating state, FIG. 29 is a block diagram of a circuit including a control circuit, and FIG. 30 is a flowchart thereof. a ... chassis, b ... optical disc, 18 ... bearing, 19 ...
Shaft, 20 ... Optical pickup, 21 ... Mounting body, 21a ... Rack, 22 ... Guide shaft, 23 ... Support plate, 23a ... Bearing, 23c ... Screw,
24 ... Push spring, 26 ... Motor, 27 ... Gear, 28 ... Rotating plate, 28
b ... long hole, 28c ... recess, 28d ... projection, 29 ... rotating piece, 29a ... projection piece, 30 ... contact piece, 31 ... spindle motor, 32 ... turntable.

Claims (1)

[Claims] 1. A chassis (a) for supporting a spindle motor (31), a shaft (19) rotatably supported in a tilt-adjustable direction with respect to a shaft (19) fixed to the chassis, and a guide shaft. An optical disc reproducing apparatus comprising: a support plate (23) having an optical pickup (20) that moves in the radial direction of the disc (b) along the (22). The support plate (23) rotatably supported is slidable also in the axial direction, and the support plate slidable in the axial direction is directed to one side in the axial direction. An urging means (24) for urging and a rotatably mounted on the support plate, and by pushing the chassis (a) at its rotating tip, the support plate is moved to the urging means. Optical axis adjusting means (28, 29) for moving in the direction opposite to the urging force against the urging force is provided. An optical disc characterized in that it is possible to adjust the optical axis center of the optical pickup (20) to coincide with the center line of the turntable (32) by rotating the optical axis adjusting means. Pickup optical axis adjustment device for playback device.