JPH01122070A - Information recording disk playing device - Google Patents

Abstract

PURPOSE:To remove unfavorable influence upon a regenerating signal caused by external vibration by enlarging the compliance of a vibration absorbing means in the direction of the center shaft of rotation of a spindle motor and the direction of the movement of a pickup giving influence upon the servo system of the pickup and simultaneously giving proper resonance sharpness. CONSTITUTION:The flat supporting member 1 of an information recording disk playing device is fitted to a base member 2 through the vibration absorbing member 3, and the member 3 sheathes a flagged screw 4 screwed on the base member 2. Besides, on the supporting member 1, a carriage 6 provided with the built-in optical pickup including the spindle motor 5 and an objective lens 6a, and a guide groove 1a as a guiding means to guide the carriage 6 so as to move along the recording surface of a disk 7, are formed. The member 3 is formed into a hollow shape whose upper end part is opened so as to make the supporting member 1 movable against the base member 2 in the direction (Z) of the center shaft of rotation of the motor 5, the direction (Y) of the movement of the carriage 6, the direction (X) orthogonal to said both directions and the direction of the rotation of the motor 5.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an information recording disk playing device such as an optical disk.

BACKGROUND ART FIG. 21 shows a conventional example disclosed in Japanese Unexamined Patent Publication No. 51-36907. In this conventional example, a support member 1 supporting a spindle motor 5 is attached to a base member 2 via vibration absorbing means 11 which is a combination of a plurality of leaf springs 9a, 9b and a coil spring 10.

FIG. 18 shows yet another conventional example, in which a spring member 13 having a substantially U-shaped cross section is fixed to the base member 2 at one end, and an intermediate member is attached to the other end of the spring member 13. A pair of spring members 16 having a substantially U-shaped cross section are provided, one end of which is fixed via a spring 14, and the other end of which supports the support member 1. These spring members 16 constitute vibration absorbing means. . Note that this configuration is disclosed in Japanese Patent Application Laid-open No. 51-6790.
It is disclosed in Publication No. 2. In such an information recording disk playing device, the entire disk playing means including the spindle motor and the pickup is attached to the base member via vibration absorbing means, so that the disk playing means is protected from external vibrations. FIGS. 13 and 14 show a typical conventional information recording disk performance device equipped with vibration absorbing means.

As shown in FIGS. 17 and 18, a flat support member 1 is attached to a base member 2, and four vibration absorbing members 3 made of rubber or the like are mounted on a base member 2.
It is attached via. The vibration absorbing member 3 is externally fitted onto a flanged screw 4 implanted on the base member 2. On the support member 1, there is a spindle motor 5, a carriage 6 which has a built-in optical pickup including an objective lens 6a, and a carriage 6 that runs along the recording surface of the disk 7 placed on the disk supporting surface 5a of the spindle motor 5. A guide means (not shown) is mounted for guiding the carriage 6 so that it moves.

As is clear from FIG. 18, the vibration absorbing member 3 is formed in the shape of a hollow body with an open upper end, so that the supporting member 1 is positioned in the first direction with respect to the base member 2 in the direction of the rotation center axis of the spindle motor 5. direction (direction of arrow Z), a second direction (direction of arrow Y) which is the moving direction of the carriage 6, a third direction (direction of arrow X) perpendicular to the first and second directions, and a rotational direction of the spindle motor 5 (direction of arrow θ2 direction).

The optical pickup described above focuses and irradiates the recording surface of the disk 7 with a laser beam that passes through the objective lens 6a, and reads recorded information based on changes in the reflected light. Nevertheless, in order to accurately focus and track the irradiated light on the recording track, servo drives (focus servo and tracking servo, respectively) are used to move the objective lens 6a finely at high speed in the first and second directions. Let's do it.

By the way, when vibrations of large amplitude are applied from the outside,
This affects the servo drive and causes noise such as skipping. Therefore, the vibration absorbing member 3 described above is provided to absorb this external vibration. Specifically, as shown by the solid line 8a in FIG. 19, by appropriately setting the compliance of the vibration absorbing member 3, the above-mentioned support member 1
The natural frequency of the movable parts consisting of the performance means mounted thereon is set as low as possible, and the resonance kurtosis Q is set appropriately to expand the frequency band of external vibrations that can be suppressed. be.

On the other hand, the center of gravity of the disc to be played is offset in the radial direction from the center of rotation, although it is set within an allowable range according to the standard. Therefore, as the disk rotates, an uneven load occurs, which causes internal vibrations on the movable portion side. When the disk is, for example, a CDV, the frequency of vibration due to such an unbalanced load is approximately 30 Hz to 45 Hz as shown in FIG. In order to reduce the internal vibration caused by this unbalanced load, it is necessary to set the natural frequency of the movable part larger than this frequency band. However, in this case, the vibration absorption effect against external vibrations that can be suppressed is reduced.

It is also possible to suppress internal vibrations due to unbalanced loads by using a material with a large internal loss for the vibration absorbing member 5, but in this case, the resonance kurtosis decreases as shown by the dashed line 8c in FIG. , the effect of suppressing external vibrations is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned points, and its purpose is to reduce external vibrations to a playing means including a spindle motor and a pickup, and internal vibrations due to unbalanced loads accompanying rotation of a disk. An object of the present invention is to provide an information recording disk performance device equipped with a vibration absorbing means that can effectively suppress vibrations.

In the information recording disk performance device according to the present invention, the vibration absorbing means interposed between the base member and the support member supporting the spindle motor, the pickup, and the pickup guide means is configured to rotate in the direction of rotation of the spindle motor and the rotation of the motor in accordance with the spin direction. It is characterized in that the compliance in the central axis direction and in the tangential direction perpendicular to the direction of movement of the pickup is smaller than that in other directions.

Embodiment Hereinafter, an information recording disk performance device as an embodiment of the present invention will be described with reference to the accompanying drawings.

FIGS. 1 and 2 show an information recording disk performance device as a first embodiment of the present invention.

As shown in FIG. 1, a support member 1 formed into a flat plate shape is attached to a base member 2 via four vibration absorbing members 3 made of rubber, for example. The vibration absorbing member 3 is externally fitted onto a flanged screw 4 screwed into the base member 2. On the support member 1, there is a spindle motor 5, a carriage 6 incorporating an optical pickup including an objective lens 6a, and a carriage 6 along the recording surface of the disk 7 placed on the disk holding surface 5a of the spindle motor 5. Guide means (not shown) are provided for guiding the carriage to move. As is clear from FIG. 2, the vibration absorbing member 3 is formed into a hollow body with an open upper end. As a result, the support member 1 is moved relative to the base member 2 in the first direction, that is, the focus direction (arrow 2 direction), which is the direction of the rotation center axis of the spindle motor 5, and in the second direction, that is, the tracking direction, that is the moving direction of the carriage 6. The vibration absorbing member 3 moves freely within the range of deflection in the third direction perpendicular to the first and second directions, that is, the tangential direction (arrow X direction), and the rotational direction of the spindle motor 5 (arrow θ2 direction). It is possible.

Two guide grooves 1a extending in the second direction (direction of arrow Y), which is the moving direction of the carriage 6, are formed in the support member 1, and two guide pins 2 protruding from the base member 2 are formed in the support member 1.
a is in sliding contact with this guide groove 1a. These guide grooves 18
and the guide pin 2a, the base member 2 of the support member 1
A regulating means is configured to regulate movement of the spindle motor in the rotational direction (direction of arrow θ2) and the third direction (tangential direction: direction of arrow X). Further, the regulating means and the above-mentioned vibration absorbing member 3 constitute a vibration absorbing means. With this configuration, the vibration absorbing means can rotate in the rotational direction of the spindle motor 5 (direction of arrow θ2).
The compliance in the third direction (tangential direction: arrow X direction) is smaller than that in other directions. The optical pickup described above directs a laser beam onto the recording surface of the disk 7 through an objective lens 6.
This objective is used to accurately focus and track the irradiated light on the recording track despite the surface wobbling of the disk 7. Servo drive (focus servo and tracking servo, respectively) is performed to finely move the lens 6a at high speed in the first direction and the second direction.

In other words, the compliance of the vibration absorbing means is increased in the direction of the rotation center axis of the spindle motor (focus direction: direction of arrow Z) and in the direction of movement of the optical pickup (tracking direction: direction of arrow Y), which affects the servo system of the optical pickup. At the same time, by providing appropriate resonance kurtosis, the frequency band of external vibrations that can be suppressed in the direction of the rotational center axis and the pickup movement direction is widened, and the occurrence of sound skipping caused by external vibrations is prevented. By setting the compliance of the vibration absorbing means small in the rotational direction and tangential direction (arrow X direction), which affect the quality of the reproduced signal, internal vibrations due to unbalanced loads accompanying disk rotation can be effectively suppressed in the rotational direction and tangential direction. This improves the quality of the reproduced signal.

Note that a viscoelastic member 2b formed in an annular shape is interposed between the guide groove 1a and the guide pin 2a constituting the above-mentioned regulating means. However, this viscoelastic member 2b is a guide pin 2a.
It is fitted into the small diameter part formed at the tip of the.

FIGS. 3 and 4 show an information recording disc playing device as a second embodiment of the present invention. The information recording disk performance device is shown in Figures 1 and 2 except for the parts explained below.
It has the same structure as the information recording disk playing device shown in the figure, and will not be described in detail, and the same or corresponding parts as the information recording disk playing device shown in FIGS. 1 and 2 are the same. Reference signs are used. Further, this also applies to the description of other embodiments to be described later.

As shown in FIGS. 3 and 4, two linear spring members 19
extend in parallel in the tangential direction (arrow X direction), and both ends of one linear spring member are fixed to the support member 1 and the base member 2 with screws 19a. The linear spring member 19 is a plate-shaped spring that is sheared so that its central portion is linearly reduced in diameter. These pair of linear spring members 19 are connected in the spindle motor rotation direction (arrow θ2 direction) of the support member 1 with respect to the base member 2.
and acts as a regulating means for regulating movement in the tangential direction (direction of arrow X).

This configuration provides the same effects as the information recording disk performance device of the first embodiment described above. Note that the linear spring member is not limited to the one having the above-mentioned configuration, and may be formed by simply bending a linear spring member, as shown in FIG.

In addition to these linear spring members, the information recording disk playing apparatus of each of the above embodiments may also be used by using a regulating member 21 shown in FIG. 6 and installing this regulating member 21 between the supporting member 1 and the base member 2. It has the same effect as. As shown in the figure, the regulating member 21 is made of resin or steel plate, and has a plurality of grooves 21a and 21b formed therein to provide flexibility.
It is flexible only in the direction of the rotation center axis of the spindle motor 5 (focusing direction: arrow Z direction) and the pickup moving direction (tracking direction: arrow Y direction).

FIGS. 7 and 8 show an information recording disk performance device as a fourth embodiment of the present invention. As shown in FIG. 7, in the information recording disc performance device, the spindle motor rotation direction (arrow θ
A pair of dashpots 22 are provided as regulating means for regulating movement in the two directions) and the tangential direction (arrow X direction).

Although the configuration is well known, as shown in FIG. 8, the dashpot 22 is connected to a cylinder 22a, an oil 22b filled in the cylinder, a piston 22c reciprocating within the cylinder, and the piston 22c. rod 2
2d.

A spherical member 22e is provided at the tip of the rod 22d, and the edge of the opening 3d formed in the base member 2 and the receiver fixed with screws on the base member 2 are connected to the four parts formed in the member 23. 23a, the spherical member 22e is held in the focus direction (arrow Z direction), and the base member 2 and the receiver are in smooth sliding contact with the member 23.

FIG. 9 and FIG. 10 show an information recording disk performance device as a fifth embodiment of the present invention. In this embodiment, the vibration absorbing means consists of only four temporary springs 25 having the same diameter. The leaf spring 25 extends in the pickup moving direction (tracking direction: arrow Y direction), has one end connected to the base member 2 with a screw, and extends in the direction of the spindle motor rotation center axis (
a first portion 25a that is flexible in the focus direction (direction of arrow Z); The second portion 25b extends in the pickup moving direction, one end is continuous with the other end of the second portion 25b, the other end is connected to the support member 1 with a screw, and is flexible in the direction of the spindle motor rotation center axis. and a third portion 25c. With this configuration, the vibration absorbing means has smaller compliance in the rotation direction of the spindle motor 5 (arrow θ2 direction) and the third direction (tangential direction: arrow X direction) than in other directions. .

FIG. 11 shows an information recording disk performance device as a sixth embodiment of the present invention. In this embodiment, the vibration absorbing means includes, for example, three viscoelastic members 27a and 28a, which are fixed on the base member 2 and have insertion holes 27a and 28a that extend in the direction of the spindle motor rotation center axis (focus direction: arrow Z direction). 28, and three pin members 30 that protrude from the base member 2 and are inserted into the various holes 27a and 28a.

Two viscoelastic members 27 except one viscoelastic member 28
The insertion hole 27a formed in is an elongated hole that extends substantially parallel to the pick-up moving direction (tracking direction: arrow Y direction). The compliance in the third direction (tangential direction: arrow X direction) is smaller than that in other directions.

Here, the effects of the present invention will be clarified with reference to FIGS. 13 to 16.

FIG. 13(a) shows the acceleration generated in the support member 1 in the tracking direction (direction of arrow Y) when a constant impact is applied from the outside with the compliance of the vibration absorbing means being small in all directions. b) shows a time axis error signal that occurs when playing an unbalanced loaded disc.

Figures 14 (a) and (b) show the vibration characteristics when the compliance of the vibration absorbing means is reduced only in the horizontal direction, and Figures 15 (a) and (b) show the vibration characteristics when the compliance of the vibration absorbing means is reduced in all directions. The vibration characteristics are shown when the value is increased to . Figures 13(a), (b) and 14(a)
) and (b), when the compliance is made small in all directions or only in the horizontal direction, the time axis error signal is reduced, but the acceleration increases. Moreover, as shown in FIGS. 15(a) and 15(b), when the compliance is increased in all directions, the acceleration is reduced, but the time axis error signal increases.

FIGS. 16(a) and 16(b) show vibration characteristics when the compliance is reduced only in the tangential direction and focus direction according to the invention of the present application. As shown, it is clear that both the acceleration and time axis error signals are reduced.

Effects of the Invention As detailed above, in the information recording disk performance device according to the present invention, the vibration absorbing means interposed between the base member and the support member that supports the spindle motor, the pickup, and the pickup guide means, The compliance in the rotational direction of the pickup and the tangential direction perpendicular to the rotation center axis direction of the spindle motor and the moving direction of the pickup is smaller than that in other directions.

In other words, the compliance of the vibration absorbing means is kept thick (maintained) in the direction of the spindle motor's rotation center axis (focusing direction), which affects the pickup's servo system, and in the direction of movement of the pickup (tracking direction), while at the same time providing appropriate resonance kurtosis. By doing so, the frequency band of external vibrations that can be suppressed in the rotation center axis direction and the pick-up movement direction is widened to prevent sound skipping caused by external vibrations, and the above-mentioned rotation that affects the quality of the reproduced signal is prevented. By setting the compliance of the vibration absorbing means small in the rotational direction and tangential direction, internal vibrations caused by bias and load caused by disk rotation can be effectively suppressed in the rotational direction and tangential direction, thereby improving the quality of the reproduced signal. There is.

[Brief explanation of the drawing]

FIG. 1 is a diffusion exploded view of an information recording disk performance device as a first embodiment of the present invention, FIG. 2 is a vertical sectional view of a part of the information recording disk performance device shown in FIG. 1, and FIG. 4 and 5 are perspective views of the linear spring member, FIG. 6 is a perspective view of the regulating member, and FIG. FIG. 8 is a plan view of an information recording disc playing device as a fourth embodiment; FIG. 8 is a partial vertical sectional view of the information recording disc playing device shown in FIG. 7;
10 are a plan view and a side view, respectively, of an information recording disk playing device as a fifth embodiment of the present invention, and FIG. 11 is a partial cross section of an information recording disk playing device as a sixth embodiment of the present invention. 12(a) and 12(b) are partial detailed views of the information recording disk playing device shown in FIG. 11, FIGS. 13 to 16 are diagrams showing vibration characteristics, and FIG. 17
22 through 22 are diagrams for explaining a conventional information recording disk performance device. Explanation of symbols of main parts 1... Support member 1a... Guide groove 2... Base member 2a... Guide pin 2b... Viscous Elastic member 3...Vibration absorbing member 5...Spindle motor 6...Carriage 7...Discs 9a, 9b, 2'5...Plate Spring 10...
- Coil spring 11... Vibration absorbing means 13.16... Spring member 19... Linear spring member 21... Regulation member 22... Dashpot 27.28... Viscoelastic member applicant Pioneer Corporation

Claims (10)

[Claims] (1) a spindle motor, a pickup, a guide means supporting the pickup so as to be movable along a plane parallel to a disk supporting surface of the spindle motor, a support member supporting the spindle motor and the guide means; and a base member supporting a support member, wherein the support member is attached to the base member via a vibration absorbing means, the vibration absorbing means being configured to rotate in the direction of rotation of the spindle motor and the spindle. An information recording disk performance device characterized in that compliance in the rotation center axis direction of the motor and in a tangential direction perpendicular to the moving direction of the pickup is smaller than that in other directions. (2) The vibration absorbing means includes a vibration absorbing member that is interposed between the support member and the base member and is flexible in the rotational direction, tangential direction, and other directions; 2. The information disc performance device according to claim 1, further comprising a regulating means for regulating movement in a tangential direction. (3) The regulating means includes a guide groove provided on one of the support member and the base member extending in the moving direction of the pickup, and a guide pin provided on the other of the support member and the base member and slidingly in contact with the guide groove. An information recording disc performance device according to claim 2, characterized in that the information recording disc performance device comprises: (4) The information recording disc performance device according to claim 3, wherein a viscoelastic member is interposed between the guide groove and the guide pin. (5) Claim 2, characterized in that the regulating means comprises a linear spring member extending in the tangential direction, installed between the supporting member and the base member, and connected to the linear spring member. The information recording disk performance device described above. (6) The restricting means extends in the tangential direction, is bridged between the support member and the base member, is connected to the restricting means, and is flexible only in the direction of the rotation center axis of the spindle motor and in the direction of movement of the pickup. The information recording disc performance device according to claim 2, characterized in that it comprises a regulating member. (7) The information recording disc playing device according to claim 2, wherein the regulating means is a dashpot. (8) The vibration absorbing means includes a leaf spring, and the leaf spring has a first portion that extends in the direction of movement of the pickup, has one end coupled to the base member, and is flexible in the direction of the rotation center axis of the spindle motor. a second portion extending in the rotational center axis direction, one end of which is continuous with the other end of the first portion, and flexible in the moving direction; and a second portion extending in the moving direction and having one end of the second portion. The information recording disc playing device according to claim 1, further comprising a third portion that is continuous with the other end, the other end is connected to the support member, and is flexible in the direction of the rotation center axis. . (9) The vibration absorbing means includes a viscoelastic member that is interposed between the support member and the base member and has an insertion hole extending in the direction of the rotation center axis of the spindle motor, and a viscoelastic member that is interposed between the support member and the base member. and a pin member that is protruded and inserted into the insertion hole, and the insertion hole formed in the other viscoelastic members except for one of the viscoelastic members has a length extending substantially parallel to the moving direction of the pickup. 2. The information recording disk performance device according to claim 1, wherein the information recording disk is a hole. (10) The information recording disk performance device according to claim 1, wherein the other direction includes a rotation center axis direction of the spindle motor and a moving direction of the pickup.