JPH02232818A - Pickup inclination adjusting mechanism for player - Google Patents

Abstract

PURPOSE:To easily adjust inclination in a tracking direction and a tangential direction by fitting an adjustment board to a slider so that the optical axis of an objective lens can pass through a turning origin and thus providing a tracking adjusting means and a tangential adjusting means. CONSTITUTION:When the height of a pickup (PU) 34, namely, an interval between an objective lens 34a and a disk D is to be adjusted loosening a screw 32 adjusts the height of the PU 34 because a holder 30 is guided by a support shaft 29a2(29a3) and raised by the energizing force of a coil spring 31. Next, in the case of adjusting the inclination of the PU 34 in the tracking direction, fastening a screw 26 to raise one part of an adjustment board 29 makes the PU 34 inclined in the tracking direction toward the inner circumference of the disk D because the PU is turned in a clock-wise direction against the energizing force of tension springs 33A-33C with support shafts 29c and 29d as a center. When the adjustment board 29 is turned, the inclination in the tracking direction can be easily adjusted because the board is turned with support shafts 29c1 and 29d1 as the center.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a digital audio disc (CD),
The present invention relates to a pickup tilt adjustment mechanism for a player that reproduces information recorded on a disc such as a laser video disc (LD).

[Conventional technology]

In order to accurately reproduce the information recorded on a disc with a player, it is necessary to accurately position the tilt of the pickup in the tracking direction and the tilt in the tangential direction and control it with a servo mechanism. FIG. 9 is a perspective view showing a pickup tilt adjustment mechanism of a conventional player, and FIG. 10 is an exploded perspective view of FIG. In FIG. 9 and FIG. IO, ■ indicates a spindle motor attached to a mechanical chassis (not shown), and 2 indicates a turntable attached to the rotating shaft of the spindle motor 1. It is to be placed. Reference numeral 3 denotes a slider, which is driven in the radial direction of the turntable 2, that is, in the X on one end
Block portion 3b provided in the Y-axis direction perpendicular to the axis
and first to third side wall portions 30 to 3 surrounding the bottom portion 3a on three sides.
It is composed of e.

The bottom portion 3a is provided with a screw hole 3a+ into which a screw portion of a first adjustment screw IO to be described later is screwed, and the block portion 3
b has a hole 3b+ into which a support shaft 6 provided on a lever 4, which will be described later, is rotatably fitted, and a recess 3bz into which a part of a dowel 8 and a first spring 9, which will be described later, are loaded.
Screw holes 3bff, 3b4 into which the second adjustment screw 14 and the screw l3 for attaching the second leaf spring l2, which will be described later, are screwed together.
is provided.

The first side wall 3c facing the block 3b has a recess 3c+ into which one end of the round piece 8 is pressed, and a projection 3c+ which separates a pickup 7, which will be described later, by a predetermined distance from the first side wall 3c. is provided.

A recessed portion 3b provided in the block portion 3b. and the center of
A straight line connecting the centers of the recesses 3c+ provided in the first side wall 3c is substantially parallel to the X axis. Reference numeral 4 indicates a lever, and the first lever has a contact portion 4a that contacts the lower surface of the pickup 7.
a flat part 4a, and a vertical part 4b continuous to the first flat part 4a.
A hole 4c+ is provided in which the head of the first adjusting screw 10 comes into contact and the screw portion passes through, and a second flat part 4C is provided at one end of the vertical part 4b on the opposite side to the flat part 4a. It is configured.

Reference numeral 5 designates a first leaf spring attached to the first flat part 4a of the lever 4, and the first spring urges the lower surface of the pickup 7 on the opposite side of the contact part 4a of the lever 4 upward. 5a, and a second spring portion 5b that biases the pickup 7 against the first side wall portion 3c of the slider 3.

Reference numeral 6 indicates a support shaft provided outside the vertical portion 4b of the lever 4, and a hole 3b formed in the block portion 3b of the slider 3.
It is rotatably fitted into the t.

Reference numeral 7 indicates a pickup, and an objective lens 7a that is driven in the vertical direction is provided at the top, as well as a through hole 7b into which a round bar 8 is fitted rotatably in the X-axis direction. Therefore, the optical axis of the objective lens 7a and the center of the hole 7b are
There is a shift amount of y0 in the Y-axis direction.

Reference numeral 8 indicates a round bar having one end formed in a conical shape, one end passing through the hole 7b of the pickup 7 engages with a recess 3cl formed in the first side wall 3c of the slider 3, and the other end is inserted into the recess 3b2 of the block 3b, and the recess 3c,
It rotates around one end that engages with the other end.

Therefore, the optical axis of the objective lens 7a of the pickup 7 and the center of rotation of the round bar 8 are offset by X0 in the X-axis direction. 9 is a concave portion 3b formed in the block portion 3b of the slider 3;
It shows the first spring loaded in the rod 8, which urges the other end of the round bar 8 upward.

Reference numeral 10 indicates a first adjustment screw for adjusting the inclination of the pickup 7 in the tangential direction.
A threaded portion is formed on the bottom portion 3a of the slider 3 so as to abut on the flat portion 4c of the slider 3, and the screw portion passes through the hole 4c of the second flat portion 4c and the second spring 11 that biases the second flat portion 4c upward. screw hole 3a. It is screwed together. Reference numeral 12 designates a second leaf spring that is attached to the block portion 3b of the slider 3 with a screw 13; The second spring portion 1 urges in the direction of the first side wall portion 3c of the third side wall portion 3c.
It is composed of 2b.

The first portion 12a is provided with a long hole 12a+ through which the threaded portion of the second adjustment screw l4 passes.

14 indicates a second adjustment screw for adjusting the inclination of the pickup 7 in the tracking direction; the head abuts the first spring portion 12a of the second leaf spring 12;
2 through the long hole 12a+ of the slider 3.
The screw hole 3b formed in b. are screwed together.

Next, the operation will be explained.

First, when adjusting the inclination of the pickup 7 in the tracking direction, by rotating the second adjustment screw l4,
The round bar 8 forms a recess 3c in the first side wall 3C of the slider 3. Since the pickup 7 rotates around the center, the inclination of the pickup 7 in the tracking direction can be adjusted by adjusting the second adjustment screw 14.

Furthermore, when adjusting the inclination of the pickup 7 in the tangential direction, the lever 4 is rotated about the support shaft 6 by rotating the first adjustment screw 10, but since the round bar 8 is present, the pickup Since the pickup 7 rotates around the round rod 8, the inclination of the pickup 7 in the tangential direction can be adjusted by adjusting the first adjustment screw 10.

[Problem to be solved by the invention]

Since the pickup inclination adjustment mechanism of the conventional player is configured as described above, when adjusting the inclination of the pickup 7 in the tracking direction, the pickup 7 is moved using the round bar 8.
When adjusting the inclination of the pickup 7 in the tangential direction, the pickup 7 rotates around the round bar 8 by rotating the portion that is in contact with the first side wall portion 3c.

Therefore, the origin for adjusting the tilt in the tracking direction and the tilt in the tangential direction of the pickup 7 is
This is the portion that is in contact with the first side wall portion 3c of the round bar 8.

The part of the dowel 8 that is in contact with the first side wall 3c and the optical axis of the objective lens 7a of the pickup 7 have a deviation of x0 in the X-axis direction and a deviation of yo in the Y-axis direction. Therefore, adjusting at least one of the tilt in the tracking direction and the tilt in the tangential direction of the pickup 7 will change the height of the pickup 7. Therefore, while adjusting the height of the pickup 7 appropriately, the tilt in the tracking direction or / Also, it is troublesome to adjust the inclination in the tangential direction, and the adjustment work takes a long time.

The present invention was made in order to solve the above-mentioned problems, and provides a pickup for a player in which the tilt in the tracking direction and/or the tilt in the tangential direction can be easily adjusted without changing the height of the pick amplifier. This provides a tilt adjustment mechanism.

[Means to solve the problem]

The pickup tilt adjustment mechanism of the player according to the present invention includes a slider that is driven in the radial direction of the turntable and has a protrusion that serves as a rotation origin on a first plane in the axial direction of the turntable that includes the radius, and a pickup. The adjustment plate is mounted on the slider, and the lower surface of the adjustment plate is pressed against the protrusion, and the adjustment plate is attached to the slider so that the optical axis of the objective lens of the pickup passes through the rotation origin. tracking adjustment means, which is provided on the slider on the first plane and rotates an adjustment plate around a straight line on a second plane perpendicular to the first plane to adjust the inclination of the pickup in the tracking direction; and a tangential adjustment means that is provided on the slider on the second plane and adjusts the inclination of the pickup in the tangential direction by rotating an adjustment plate about a straight line on the first plane.

[For production]

In the pickup tilt adjustment mechanism of the player according to the present invention, the adjustment plate is attached to the slider so that the optical axis of the objective lens of the pickup passes through the rotating origin of the protrusion, so that when the tracking adjustment means is adjusted, the pickup is
Since the pickup rotates around a straight line on the plane, the tilt in the tracking direction can be adjusted without changing the height of the pickup.

When the tangential adjustment means is adjusted, the pickup rotates around the straight line of the first plane, so the inclination in the tangential direction can be adjusted without changing the height of the pickup.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a plan view showing a pickup inclination adjustment mechanism of a player according to an embodiment of the present invention, FIG. 2 is an enlarged plan view showing a slider with the pickup removed and an adjustment plate, and FIG.
The drawings are an exploded perspective view of FIG. 2, FIG. 4 is an enlarged plan view showing the pickup height adjustment mechanism, and FIG. 5 is an enlarged side view with a part cut away showing the pickup height adjustment mechanism.

1 to 5, reference numeral 21 indicates a mechanical chassis, and 22 indicates a turntable on which the disk D is placed, which is attached to the mechanical chassis 21 and attached to the rotating shaft of a spindle motor (not shown).

23A and 23B indicate first and second guide shafts that are attached to the mechanical chassis 2l in parallel with the radial direction (X-axis) of the turntable 22, and the first guide shaft 23A is on the drive side; 2 guide shaft 23B
is the driven side.

Reference numeral 24 indicates a linear motor attached to the mechanical chassis 2l, which drives a slider 25, which will be described later.

25 denotes a slider, a part of which is connected to the drive core of the linear motor 24, and which is connected to the first and second guide shafts 23A,
23B in the X-axis direction, and is driven by the linear motor 24 in the X-axis direction along the bottom portion 25a and the first and second guide shafts 23A and 23B, respectively, which extend upward and face each other in the X-axis direction. 1. It is composed of second side wall parts 25b and 25c. On the upper surface of the bottom portion 25a, a protrusion 25a as a protrusion serving as a rotation origin of an adjustment plate 29, which will be described later, is located on a first plane in the axial direction of the turntable 22 including the X axis. is provided.

Further, on the bottom part 25a, a first plate is provided on the first plane for adjusting the inclination of the pickup 34 in the tracking direction, which will be described later.
A first screw hole 25a2 into which the adjustment screw 26 is screwed, and a second screw hole 25a2 which adjusts the inclination of the pickup 34 in the tangential direction on a second plane (including the Y-axis) orthogonal to the first plane. a second screw hole 25a into which the adjustment screw 27 is screwed;
and an opening 2 for adjusting the height of the pickup 34.
5a, and a first spring for locking one end of first to third tension springs 33A to 33C, which will be described later.
~Third locking portions 25a and ~25a7 are provided. Further, the first side wall portion 25b is provided with a third
A first groove portion 25b1 is provided for guiding the support shaft 29c+ in the vertical direction and the Y-axis direction on a plane, and a fourth support shaft 29d1 provided on the adjustment plate 29 is provided in the second side wall portion 25c for guiding the support shaft 29c+ in the vertical direction on a plane. , a second groove portion 25C1 that guides in the Y-axis direction, and a third screw hole 25C8 into which a third adjustment screw 28 that moves the adjustment plate 29 in the Y-axis direction and adjusts the centering of the pickup 34 is screwed. It is provided.

Reference numeral 26 indicates a first adjustment screw that is screwed into a first screw hole 25a2 provided in the bottom portion 25a of the slider 25, and is used to adjust the inclination of the pickup 34 in the tracking direction. Reference numeral 27 indicates a second adjustment screw that is screwed into a second screw hole 25a provided in the bottom portion 25a of the slider 25, and is used to adjust the inclination of the pickup 34 in the tangential direction.

28 is a third portion provided on the second side wall portion 25c of the slider 25.
A third adjusting screw is shown which is screwed into the screw hole 25c2, and the centering of the pickup 34 is adjusted by moving the adjusting plate 29 in the Y-axis direction.

29 is a protrusion 25a+ provided on the bottom 25a of the slider 25.
and first and second adjustment screws 26. 27 shows the adjustment plate placed on the plane formed by the bottom part 29a and the bottom part 2.
A retaining portion 29b extending downward in the Y-axis direction at one end of 9a, and first and second guide shafts 23A and 23B, respectively.
first and second side wall portions 29c and 29d extending upward and facing each other in the X-axis direction on the side thereof, and a third side wall portion extending upward in the Y-axis direction on the side facing the locking portion 29a. 29e.

The bottom portion 29a has a hole 29a+ through which a threaded portion of a fourth adjustment screw 32 (described later) is inserted, and a holder 30 (described later).
a first support shaft 29at inserted into the first hole 30b;
A second support shaft 29a3 for preventing rotation of the holder 30 is provided in the first side wall portion 29c and is guided by engaging with a first groove portion 25b1 provided in the first side wall portion 25b of the slider 25. The first locking portion 2 corresponds to the first locking portion 25a provided on the bottom 25a of the slider 25 in order to lock the third support shaft 29CI and the other end of the first tension spring 33A.
9C2 is provided. Further, the second side wall portion 29d includes a fourth support shaft 29dl that is guided by engaging with a second groove portion 25CI provided in the second side wall portion 25c of the slider 25, and a second tension spring 33.
In order to lock the other end of B, the bottom part 25 of the slider 25 is
A second locking portion 29dt corresponding to the second locking portion 25a provided at the bottom portion 25a of the slider 25 is provided on the third side wall portion 29e. A second locking portion 29e1 corresponding to the second locking portion 29e1 is provided.

Reference numeral 30 indicates a holder, which includes a pickup mounting portion 30a for positioning and screwing the pickup 34, and a first hole 30b into which the first support shaft 29a2 of the adjustment plate 29 is inserted.
and the groove 3 in which the second support shaft 29a of the adjustment plate 29 engages.
0c and a screw hole 30d into which the screw portion of the fourth adjustment screw 32 is screwed is provided.

Reference numeral 31 indicates a coil spring in which the first support shaft 29a2 of the adjustment plate 29 is inserted into the coil portion, and one end thereof is inserted into the second support shaft 29a2 of the adjustment plate 29.
At the same time, the other end is locked to a part of the holder 30, and the holder 30 seen from above is biased clockwise about the first support shaft 29a2. Holder 3
A part of the groove 30C of 0 is connected to the second support shaft 29as.
holder 3 so that they collide without shaking.
0 upwardly away from the adjustment plate 29. Reference numeral 32 designates a fourth adjustment screw whose head abuts against the lower surface of the adjustment plate 29, and whose screw portion passes through the hole 29a1 of the adjustment plate 29 and is screwed into the screw hole 30d of the holder 30.

33A to 33C are the first to third locking parts 2 of the slider 25
5a, to 25a, and the first to third locking portions 2 of the adjustment plate 29
9cz, 29dz, and 29e+, and the adjusting plate 29 is attached to the slider 25 in the direction of the turntable 22 and in the direction of the mechanical chassis 21. It is something that strengthens.

Therefore, the adjustment plate 29 is connected to the first to third tension springs 33A.
-33C, the direction of the turntable 22, the direction of the plane formed by the protrusion 25a1 provided on the bottom 25a of the slider 25, the first and second adjustment screws 26, 27, and the third adjustment screw 28 It will be biased in the direction of , and will not wobble.

Reference numeral 34 indicates a pickup attached to the pickup attachment portion 3oa of the holder 30, and an objective lens 34a that is driven in the vertical direction is provided at the top.

Figure 6 (a), (b), Figure 7 (a), Cb)
8(a) and 8(a) and 8(a) are explanatory diagrams for adjusting the height of the pickup, the tilt in the tracking direction, and the tilt in the tangential direction, respectively.

Next, we will explain the operation. First, when adjusting the height of the pickup 34, that is, the gap between the objective lens 34a and the disk D in the state shown in FIG. 30 is the first and second support shaft 29at
*Since the pick-up 34 rises while being guided by the pick-up 29a3, the height of the pick-up 34 can be adjusted as shown in FIG. 6(b).

Therefore, by rotating the fourth adjustment screw 32, the holder 30 can be moved up and down, so that the height of the pickup 34 can be easily and precisely adjusted by the fourth adjustment screw 32. Next, when adjusting the inclination of the pickup 34 in the tracking direction in the state shown in FIG. 7(a) in which the height adjustment of the pickup 34 is completed as described above, tighten the first adjustment screw 26 and close the adjustment plate 29. When a part of
The first to third tension springs 33 center around +t29+L.
Because it rotates clockwise against the urging force of A to 33C,
As shown in FIG. 7(b), the tracking direction can be tilted toward the inner circumference of the disk D.

Note that when the adjustment plate 29 rotates, the third and fourth support shafts 2
9c+, 29d+ are the first and second groove portions 25b+
s25c, is guided by the plane of the side wall that constitutes.

Therefore, by rotating the first adjustment screw 26, the adjustment plate 29 is moved between the third and fourth support shafts 29c. 29dl, the inclination in the tracking direction can be easily adjusted by the first adjustment screw 26 without changing the height of the pickup 34. Next, when adjusting the tilt in the tangential direction in the state shown in FIG.
When the adjustment screw 27 is tightened and a part of the adjustment plate 29 is lifted, the adjustment plate 29 will move against the biasing force of the first to third tension springs 33A to 33C about a straight line parallel to the X axis. Since it rotates clockwise, the tangential direction can be tilted to the left of the disk D, as shown in FIG. 8).

Therefore, by rotating the second adjustment screw 27, the adjustment plate 29 is rotated about a straight line parallel to the X axis, so that the second adjustment screw 27 can easily adjust the tilt in the tangential direction. 34 can be adjusted without changing the height.

Next, when adjusting the centering of the pickup 34 after adjusting the height, tracking direction inclination, and tangential direction inclination of the pickup 34 as described above, tighten the third adjustment screw 28 and adjust the adjustment plate. 29 first
When pushed downward in FIGS. 2 and 2, the adjustment plate 29
and is guided by third and fourth support shafts 29c+t29d+ that align the planes formed by the first and second adjustment screws 26.27 with the first and second grooves 25bt and 25c+,
It moves downward in FIGS. 1 and 2 against the urging force of the first to third tension springs 33A to 33C. Therefore, by rotating the third adjustment screw 28, the adjustment plate 29 can be moved in the Y-axis direction, so that the centering of the pickup 34 can be easily and precisely adjusted by the third adjustment screw 28. .

When the centering of the pickup 34 is completed, the optical axis of the objective lens 34a passes through the rotation origin of the protrusion 25a.

Thus, according to the embodiment described above, the first and second adjustment screws 26 . By rotating the pickup 27, the inclination in the tracking direction and the inclination in the tangential direction can be adjusted easily and accurately without changing the height of the pickup 34.

By rotating the third adjustment screw 28, the adjustment plate 29 can be moved in the Y-axis direction, and the pickup 34 can be centered easily and accurately. Note that adjusting the inclination in the tracking direction and the inclination in the tangential direction of the pickup 34 causes the center of the pickup 34 to shift, so the centering of the pickup 34 is adjusted last.

Further, in the above-described embodiment, an example has been described in which the slider 25 is provided with the protrusion 25a as a protrusion that serves as the origin of rotation of the adjustment plate 29.
For example, it may be the tip of a screw screwed into the slider 25.

〔Effect of the invention〕

As described above, according to the present invention, the adjustment plate is attached to the slider, which has a protrusion that serves as the rotation origin on a plane passing through the axis of the turntable, so that the optical axis of the objective lens of the pickup passes through the rotation origin. Tracking adjustment means and tangential adjustment means are provided to adjust the mounting, the tilt of the pickup in the tracking direction, and the tilt of the pickup in the tangential direction, so even if the tracking adjustment means and tangential adjustment means are adjusted, the height of the pickup will not change. Therefore, the tilt in the tracking direction and the tilt in the tangential direction can be adjusted easily and accurately, and the height, the tilt in the tracking direction, and the tilt in the tangential direction can be adjusted without changing the other. This has the effect of being easily adjustable.

The center of the pickup shifts when adjusting the inclination in the tangential direction, but by moving the adjustment plate on the plane formed by the protrusion, tracking adjustment means, and tangential adjustment means, the height of the pickup can hardly be changed. This has the effect of making it possible to adjust the centering without having to

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a pickup tilt adjustment mechanism of a player according to an embodiment of the present invention, FIG. 2 is an enlarged plan view showing the slider and adjustment plate with the pickup removed, and FIG. 3 is an exploded perspective view of FIG. 2. Figure 4 is an enlarged plan view showing the pickup height adjustment mechanism, Figure 5 is an enlarged side view with a part cut away showing the pickup height adjustment mechanism, and Figures 6 (a) and (b) are the pickup height adjustment mechanism. 7(a) and (b) are illustrations for adjusting the inclination in the tracking direction. Fig. 8(a) and (b) are illustrations for adjusting the inclination in the tangential direction. 9 is a perspective view showing a pickup tilt adjustment mechanism of a conventional player, and FIG. 10 is an exploded perspective view of FIG. 9. 22...Turntable, 25...Slider, 25a,...Protrusion, 26...First adjustment screw, 27...Second adjustment screw, 28...Third adjustment screw, 29...adjustment plate, 3
0... Holder, 31... Coil spring, 32... Fourth adjustment screw, 33A to 33C... First to third tension springs, 34... Pickup, 34a... Objective lens ．．

Claims (1)

[Scope of Claims] A slider that is driven in the radial direction of the turntable and has a protrusion that serves as a rotation origin on a first plane in the axial direction of the turntable that includes the radius, and a pickup are mounted, an adjusting plate placed on the slider; a lower surface of the adjusting plate being brought into pressure contact with the protrusion;
a plurality of biasing means in which the adjustment plate is attached to the slider so that the optical axis of the objective lens of the pickup passes through the rotation origin;
a tracking adjustment means for adjusting the inclination of the pickup in the tracking direction by rotating the adjustment plate around a straight line on a second plane perpendicular to the plane of , provided on the slider on the second plane, Said first
A pickup tilt adjustment mechanism for a player, comprising: tangential adjustment means for adjusting the tilt of the pickup in a tangential direction by rotating the adjustment plate about a straight line in a plane.