JPH0775074B2 - Player pickup centering adjustment mechanism - Google Patents

Description

The present invention relates to a pickup centering adjusting mechanism for a player for reproducing information recorded on a disc such as a digital audio disc (CD) and a laser video disc (LD). It is about.

[Conventional technology]

In order to accurately reproduce the information recorded on the disc with the player, the pip-up core, that is, the optical axis of the objective lens, includes the turntable axial direction including the radius of the turntable parallel to the straight line on which the slider moves. Must match the plane of.

Conventionally, when adjusting the centering of the pickup as described above, with the slider drive mechanism that drives the slider fixed to the mechanical chassis, the spindle motor with the turntable attached is temporarily fixed to the mechanical chassis and the pickup objective is adjusted. When the path of the optical axis of the lens coincided with the radius of the turntable, the mounting screw was tightened to permanently fix the spindle motor to the mechanical chassis.

[Problems to be Solved by the Invention]

Since the conventional player's pickup is centered as described above, when the mounting screw is tightened to permanently fix the spindle motor to the mechanical chassis, the spindle motor moves with respect to the mechanical chassis. It will shift.

Therefore, the centering of the pickup is troublesome, and there is an inconvenience that the adjustment work requires a long time.

The present invention has been made to solve the above-mentioned inconvenience, and provides a pickup centering adjusting mechanism for a player, which allows easy and accurate centering of the pickup.

[Means for Solving the Problems]

A pickup centering adjustment mechanism for a player according to the present invention is a slider driven in a radial direction of a turntable, an adjustment plate on which a pickup is mounted and which is attached so as to be movable in a tangential direction of the slider, and the adjustment plate. A plurality of biasing means provided between the slider and the adjusting plate so as to press the slider against one side wall of the slider in the tangential direction; Centering adjustment means for adjusting the centering of the pickup by moving the pickup.

[Action]

In the pickup centering adjustment mechanism of the player according to the present invention, the adjustment plate is attached to the slider in a state of being movable in the tangential direction. Therefore, when the centering adjustment means is adjusted, the adjustment plate moves in the orthogonal direction. The centering of the pickup can be adjusted.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

1 is a plan view showing a pickup centering adjusting mechanism of a player according to an embodiment of the present invention, FIG. 2 is an enlarged plan view showing a slider and an adjusting plate from which a pickup is removed, and FIG. 3 is an exploded view of FIG. FIG. 4 is a perspective view, FIG. 4 is an enlarged plan view showing a pickup height adjusting mechanism portion, and FIG. 5 is an enlarged side view in which a part of the pickup height adjusting mechanism is cut away.

In FIGS. 1 to 5, reference numeral 21 denotes a mechanical chassis, reference numeral 22 denotes a turntable on which the disk D is mounted, which is attached to the mechanical chassis 21 and is attached to a rotary shaft of a spindle motor (not shown).

Reference numerals 23A and 23B denote the first and second guide shafts attached to the mechanical chassis 21 in parallel with the radial direction (X axis) of the turntable 22, and the first guide shaft 23A is the drive side. The second guide shaft 23B is on the driven side.

A linear motor 24 is attached to the mechanical chassis 21, and drives a slider 25 described later.

Reference numeral 25 denotes a slider, which is partially connected to the drive core of the linear motor 24 and is driven by the linear motor 24 in the X-axis direction along the first and second guide shafts 23A and 23B.
The bottom portion 25a and the first and second guide shafts 23A and 23B, respectively
It is composed of first and second side wall portions 25b, 25c that extend upward and face each other in the X-axis direction on the side of.

Then, on the upper surface of the bottom portion 25a, the turntable 2 including the X-axis
Projections 25a ₁ of the protrusion serving as the rotation origin of adjusting plate 29 described later to the first planar second axis direction is provided.

Further, in the bottom portion 25a, a first screw hole 25a _{2 into} which a first adjusting screw 26 for adjusting the inclination of the pickup 34, which will be described later, in the tracking direction is screwed on the first plane, and is orthogonal to the first plane. Pick up on the second plane (including the Y-axis)
A second screw hole 25a _{3 into} which a second adjusting screw 27 for adjusting the inclination of the tangential direction of 34 is screwed, and the pickup 34
An opening portion 25a ₄ is provided for adjusting the height, the first to third engaging portion 25a for engaging the end portions of the first to third tension spring 33A~33C described later ₅ ~ 25a ₇ are provided.

The first side wall portion 25b has a first groove portion that guides the third support shaft 29c ₁ provided on the adjusting plate 29 in the vertical direction and the Y-axis direction on a plane.
25b ₁ is provided, and the second side wall portion 25c is provided with a second groove portion 25c ₁ for guiding the fourth support shaft 29d ₁ provided on the adjusting plate 29 in the vertical direction and the Y-axis direction on a plane, and the adjusting plate 29c. the third screw hole 25c ₂ in which the third adjustment screw 28 for adjusting the centering is screwed is provided with pick-up 34 is moved in the Y-axis direction.

Reference numeral 26 denotes a first adjusting screw that is screwed into a first screw hole 25a ₂ provided in the bottom portion 25a of the slider 25, and adjusts the inclination of the pickup 34 in the tracking direction.

Reference numeral 27 denotes a second adjusting screw that is screwed into the second screw hole 25a ₃ provided in the bottom portion 25a of the slider 25, and adjusts the inclination of the pickup 34 in the tangential direction.

Reference numeral 28 denotes a third adjusting screw which is screwed into a third screw hole 25c ₂ provided in the second side wall portion 25c of the slider 25, and the adjusting plate 29 is set to Y
The centering of the pickup 34 is adjusted by moving the pickup 34 in the axial direction.

29 is a protrusion 25a ₁ provided on the bottom 25a of the slider 25 and
The adjustment plate placed on the plane formed by the second adjustment screws 26 and 27 is shown, and includes a bottom portion 29a, an engaging portion 29b extending downward in the Y-axis direction at one end of the bottom portion 29a, and a first portion, respectively. In the X-axis direction on the side of the second guide shafts 23A, 23B, the first and second side wall portions 29c, 29d extending upward and facing each other and the Y-axis direction on the side facing the locking portion 29a, It is composed of a third side wall portion 29e extending upward.

Then, a hole 29a ₁ into which a screw part of a fourth adjusting screw 32 described later is inserted in the bottom part 29a and a _first hole of a holder 30 described later.
A first support shaft 29a ₂ inserted through 30b and a _second support shaft 29a ₃ for preventing rotation of the holder 30 are provided, and the first side wall part 29c is attached to the first side wall part 25b of the slider 25. First groove portion 25b provided
_Since the third support shaft 29c ₁ guided by engaging with ₁ and the other end of the first tension spring 33A are locked, the bottom portion 2 of the slider 25 is
First locking portion 29 corresponding to first locking portion 25a ₅ provided on 5a
c ₂ is provided.

Further, the second side wall 29b has a fourth spindle 29d ₁ guided by engaging with a second groove 25c ₁ provided in the second side wall 25c of the slider 25, and a second tension spring. The second locking portion 2 provided on the bottom portion 25a of the slider 25 for locking the other end of 33B.
A second engaging portion 29d ₂ corresponding to 5a ₆ is provided, and a third engaging portion provided on the bottom portion 25a of the slider 25 is provided on the third side wall portion 29e.
A second locking portion 29e ₁ corresponding to 25a ₇ is provided.

Reference numeral 30 denotes a holder, which is a pickup mounting portion 30a for positioning and mounting the pickup 34 with a screw, a first hole 30b through which the first support shaft 29a ₂ of the adjusting plate 29 is inserted, and a second hole of the adjusting plate 29. The groove 30c with which the support shaft 29a ₃ engages, and the fourth adjusting screw 3
A screw hole 30d into which the second screw portion is screwed is provided.

Reference numeral 31 denotes a coil spring in which the first support shaft 29a ₂ of the adjustment plate 29 is inserted into the coil portion, and one end of the second support shaft 29a ₃ of the adjustment plate 29.
And the other end is also locked to a part of the holder 3, and the holder 30 viewed from above is urged clockwise around the first support shaft 29a ₂ and the groove portion of the holder 30. A part of 30c is abutted against the second support shaft 29a ₃ so as not to rattle, and the holder 30 is biased upward away from the adjustment plate 29.

32 is intended to be screwed to the fourth shows the adjustment screw, the head is in contact with the lower surface of the adjustment plate 29, screw holes 30d of the holder 30 screw portion passes through the hole 29a ₁ of the adjusting plate 29.

33A to 33C are the first to third locking portions 25a _{5 to} 25a ₇ of the slider 25.
Shows the first to third tension spring is stretched between the first to third engaging portion 29c _2, 29d _2, 29e ₁ of the adjusting plate 29 and adjustment plate
29 is urged toward the slider 25 toward the turntable 22 and toward the mechanical chassis 21.

Therefore, the adjusting plate 29 has the first to third tension springs 33A to 33C.
The biasing force of the
The protrusion 25a ₁ provided on the bottom portion 25a of 25 and the first and second adjusting screws 26, 27 and the direction of the plane formed by the third adjusting screw 28 are urged so that there is no rattling. .

Reference numeral 34 denotes a pickup attached to the pickup attaching portion 30a of the holder 30, and an objective lens 34a that is driven in the vertical direction is provided on the upper portion.

FIGS. 6 (a) and (b), FIGS. 7 (a) and (b) and FIGS. 8 (a) and (b) show the height of the pickup, the inclination in the tracking direction and the inclination in the tangential direction, respectively. It is explanatory drawing which adjusts.

Next, the operation will be described.

First, in the state of FIG. 6 (a), the height of the pickup 34,
That is, when adjusting the gap between the objective lens 34a and the disk D, if the fourth adjusting screw 32 is loosened, the holder 30 is guided to the first and second support shafts 29a ₂ and 29a ₃ by the urging force of the coil spring 31. As a result, the height of the pickup 34 can be adjusted as shown in FIG. 6 (b).

Therefore, by rotating the fourth adjusting screw 32,
Since the holder 31 can be moved up and down, the height of the pickup 34 can be easily and accurately adjusted by the fourth adjusting screw 32.

Next, when adjusting the inclination of the pickup 34 in the tracking direction in the state shown in FIG. 7A where the height adjustment of the pickup 34 has been completed as described above, the first adjusting screw 26 is tightened to adjust the adjusting plate 29. When you lift a part of the
Centering on the fourth support shafts 29c ₁ and 29d ₁ , the first to third tension springs 3
Since it rotates clockwise against the biasing force of 3A to 33C,
As shown in FIG. 7B, the inclination in the tracking direction can be inclined to the inner circumference of the disc D.

When the adjusting plate 29 rotates, the third and fourth support shafts 29c ₁ , 2
9d ₁ is guided by the planes of the side walls forming the _first and second groove portions 25b ₁ and 25c ₁ .

Therefore, by rotating the first adjusting screw 26,
Since the adjusting plate 29 rotates about the third and fourth support shafts 29c ₁ and 29d ₁ , the first adjusting screw 26 makes it easy to tilt in the tracking direction without changing the height of the pickup 34. Can be adjusted.

Next, in the case where the tilt in the tangential direction is adjusted in the state of FIG. 8A in which the height of the pickup 34 and the tilt in the tracking direction are completed as described above,
When a part of the adjusting plate 29 is lifted up by tightening the adjusting screw 27 of No. 3, the adjusting plate 29 counters the urging 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 tilt can be tilted to the left of the disk D, as shown in FIG. 8 (b).

Therefore, by rotating the second adjusting screw 27,
Since the adjusting plate 29 rotates about a straight line parallel to the X axis,
With the second adjusting screw 27, the inclination in the tangential direction can be easily adjusted without changing the height of the pickup 34.

Next, when the height of the pickup 34, the inclination in the tracking direction, and the inclination in the tangential direction are adjusted as described above, when the centering of the pickup 34 is adjusted,
Tighten the third adjusting screw 28 to fix the adjusting plate 29 in FIG. 1 and FIG.
When pushed down in the figure, the adjustment plate 29 will move to the protrusion 25a ₁ and the first and second
Of the adjusting screws 26, 27 of the first and second groove portions 25b ₁ ,
Guided by the third and fourth support shafts 29c ₁ and 29d ₁ engaging with 25c ₁ ,
First against the biasing force of the first to third tension springs 33A to 33C
Move to the bottom of Fig. 2 and Fig. 2.

Therefore, by rotating the third adjusting screw 28,
Since the adjusting plate 29 can be moved in the Y-axis direction, the centering of the pickup 34 can be easily and accurately adjusted by the third adjusting screw 28.

Then, 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 ₁ .

As described above, according to the above-described embodiment, by rotating the first and second adjusting screws 26 and 27, the inclination of the tracking direction and the tangential direction of the pickup 34 are changed without changing the height of the pickup 34. The tilt can be adjusted easily and accurately.

Then, by rotating the third adjusting screw 28, the adjusting plate 29 can be moved in the Y-axis direction, and the pickup
34 can be centered easily and accurately.

If the inclination of the pickup 34 in the tracking direction and the inclination of the tangential direction are adjusted, the pickup 34
Since the center of the pickup is misaligned, the centering of the pickup 34 is finally adjusted.

Further, in the embodiment described above was described using an example in which a projection 25a ₁ to the slider 25 as the projecting portion serving as the rotation origin of adjusting plate 29, those serving as the rotation origin as well as projections 25a _1, for example a slider It may be a tip portion of a screw screwed to 25.

〔The invention's effect〕

As described above, according to the present invention, the adjusting plate is attached to the slider so as to be movable in the tangential direction, and the centering adjusting means of the pickup for moving the adjusting plate in the tangential direction with respect to the slider is provided. Therefore, when the centering adjusting means is adjusted, the adjusting plate moves in the orthogonal direction, so that the centering of the pickup can be easily and accurately adjusted.

[Brief description of drawings]

1 is a plan view showing a pickup centering adjusting mechanism of a player according to an embodiment of the present invention, FIG. 2 is an enlarged plan view showing a slider and an adjusting plate from which a pickup is removed, and FIG. 3 is an exploded view of FIG. FIG. 4 is a perspective view, FIG. 4 is an enlarged plan view showing a pickup height adjusting mechanism portion, FIG. 5 is an enlarged side view showing a part of the pickup height adjusting mechanism, and FIGS. 6 (a) and 6 (b) are FIGS. 7 (a) and 7 (b) are explanatory views for adjusting the tilt in the tracking direction, and FIGS. 8 (a) and 8 (b) are for adjusting the tilt in the tangential direction. FIG. 22 …… turntable, 25 …… slider, 25a ₁ …… projection, 25b …… first side wall part, 25b ₁ …… first groove part, 25c ...
… Second side wall part, 25c ₁ …… Second groove part, 26 …… First adjusting screw, 27 …… Second adjusting screw, 28 …… Third adjusting screw, 29 …… Adjusting plate, 29c ₁ ...... 3rd support shaft, 26d ₁ ...... 4th
Groove, 30 …… Holder, 31 …… Coil spring, 32 …… Fourth
Adjusting screws, 33A to 33C ... first to third tension springs, 34 ...
… Pickup, 34… Objective lens.

Claims (1)

[Claims] 1. A slider driven in a radial direction of a turntable, an adjustment plate on which a pickup is mounted and movably attached to the slider in the tangential direction, and the adjustment plate which is mounted in the tangential direction of the slider. A plurality of urging means provided between the slider and the adjusting plate so as to be in pressure contact with one of the side wall portions; and the adjusting plate provided in the side wall portion and moved in the tangential direction to move the adjusting plate. A pickup centering adjusting mechanism for a player, comprising: centering adjusting means for adjusting the centering.