JPH03212887A - Information recording disk player - Google Patents

Abstract

PURPOSE:To always perform the reading of information with a pickup smoothly by providing a bottom part and plural side wall parts at a longitudinal supporting member, forming the cross-section of them in almost drain shape, and setting each wall plane of the side wall parts in non-parallel with each other. CONSTITUTION:A supporting member 11 extending in a direction to move the pickup is provided with a flat shape bottom part 11a and the side wall parts 11b-11e in every direction coupled integrally with the edge of the bottom part so as to cross to the bottom part, and is formed in shape of container whose upper plane is opened as a whole. Also, the supporting member 11 is formed in such a way that the shape of the cross-section perpendicular to a direction to guide the pickup is formed in almost drain shape, and each wall plane of the side wall parts 11b and 11c and the mutual side planes of a pair of side wall parts 11d and 11e are set in non-parallel. In such a way, it is possible to increase the rigidity of the supporting member, and to decrease the distortion quantity of the supporting member even when an external force is applied, and to always perform the reading of recording information with the pickup smoothly.

Description

TECHNICAL FIELD The present invention relates to an information recording disc player, and more particularly to the structure of a support member supporting a pickup, its guide means, and a spindle motor.

Figure 6 shows the main parts of a conventional information recording disc player. As shown in the figure, the conventional device includes a guide shaft 2 that guides an optical pickup 1 and a spindle motor 3.
is mounted on a support member 4 extending in the direction in which the pickup 1 is to be guided.

By the way, especially when the pickup 1 is an optical type, it is important to maintain the relative position of the pickup 1 and the recording track of the information recording disk (not shown) rotated by the spindle motor 3 with high accuracy. To this end, in addition to increasing the manufacturing accuracy of each of the above-mentioned parts and the assembly accuracy of the parts, it is necessary to increase the rigidity of the support member 4 as much as possible to reduce the relative relationship between the above-mentioned parts due to the distortion of the support member 4. It is necessary to minimize misalignment.

However, simply making the support member larger in order to increase its rigidity results in an increase in the size and weight of the player as a whole.

In a conventional device configured under such conditions, the support member 4 has a portion 4 that supports the guide shaft 2, as shown in the figure.
The supporting member 4 is formed on a relatively thin flat plate and does not yet have sufficient rigidity, and when the player receives an external force, the supporting member 4 is greatly distorted, which may impede reading by the pickup 1.

Summary of the Invention [Object of the Invention] The present invention has been made in view of the above points, and its object is to provide an information recording disc player in which information can always be read smoothly by a pickup. .

[Structure of the Invention] In the information recording disc player according to the present invention, a longitudinal support member supporting a guide means for guiding a pickup and a spindle motor and extending in a direction in which the pickup is to be guided is provided with a bottom portion and a longitudinal support member that extends in the direction in which the pickup is to be guided. The method is characterized in that it has a plurality of side walls connected in such a manner that the cross section perpendicular to the direction has a substantially gutter-like shape, and the wall surfaces of each of the side walls are non-parallel to each other. ing.

[Operation of the invention] In the information recording disc player having such a configuration, the supporting member has extremely high rigidity but is light in weight.
Moreover, the waves incident on the inner wall surface of the support member and the reflected waves do not interfere with each other.

Embodiments Hereinafter, main parts of an information recording disc player as an embodiment of the present invention will be explained with reference to the accompanying drawings.

In FIGS. 1 to 5, a longitudinal support member 11 is fixed in a player housing (not shown) via a chassis 12, is made of resin, etc., and extends in the direction in which a pickup (described later) is to move. are doing. The support member 11 includes a flat bottom portion 11a and four side walls 11b integrally connected to the edges of the bottom portion so as to intersect with the bottom portion.
11e to 11e, and is in the form of a container with an open top surface as a whole. The support member 11 is integrally provided with a substantially cylindrical motor accommodating portion 11f further outside the side wall portion 11e on one end side in the longitudinal direction. As is particularly clear from FIG. 1, the motor accommodating portion 11f includes a rotor 13a1, a cylindrical stator 13b1, a spindle 13c,
The spindle motor 13 is provided with an upper cover (not shown) and a lower cover 13f, which respectively close the upper and lower openings of the stator 13b. The upper end of the motor accommodating portion 11f is covered by a clay wall 11g integral with the motor accommodating portion 11f, and the tip of the spindle 13c protrudes above the upper wall 11g. A turntable 15 carrying a disk (hereinafter simply referred to as a disk) 14 is fitted.

4 and 5 respectively show the IV-IV cross section and the v-■ arrow view including a partial cross section with respect to FIG. 2. As is particularly clear from these figures, the support member 11 is (described later) is formed so that the shape of the cross section perpendicular to the direction in which it is to be guided is approximately gutter-like, and the wall surfaces of the side wall portions 11b and llc are non-parallel to each other. The support member 11 also has a wide gutter-like cross-sectional shape parallel to the moving direction of the pickup, and the wall surfaces of the pair of side wall portions lid and lie included in the cross-sectional shape are non-parallel.

Due to this configuration, the moment of inertia of the supporting member 11 in each of the above-mentioned cross sections is extremely large, and high rigidity is obtained. Furthermore, as described above, since the wall surfaces of each side wall portion of the support member 11 are non-parallel to each other, waves incident on each wall surface and reflected waves do not interfere with each other, and the generation of standing waves is prevented. There is.

On the other hand, a substantially flat tilt base 17 formed of a steel plate or the like corresponds to the outer surface of the side wall portion 11b of the support member 11.
is disposed, and is swingably supported by a support bin 18 protruding from the side wall portion 11b. The support bin 18 is provided to extend parallel to the disk holding surface of the turntable 15. Therefore, the tilt base 17 swings in a plane perpendicular to the disk holding surface of the turntable 15. along the plane containing the central axis of rotation. A guide shaft 20 serving as a guide means is attached to the upper end of the tilt base 17 via a pair of resin attachment members 21, and a carriage 23 is slidably supported by the guide shaft. Note that two guide grooves 11h are formed in the support member 11 to slide on both ends of the guide shaft 20 and guide it.

Mounted within the carriage 23 are an optical system including an objective lens 24 and a servo mechanism that servo drives the objective lens in two directions: the direction of its optical axis (focus direction) and the direction perpendicular thereto (tracking direction). ing. Note that the carriage 23, optical system, and servo mechanism constitute an optical pickup. The optical pickup irradiates the recording surface of the disk 14 with a laser beam, receives reflected light from the recording surface, and reads recorded information based on changes in the reflected light.

As shown in FIGS. 1 to 3, a pair of protrusions 11i are protruded from the outer surface of the side wall portion 11b of the support member 11 in parallel with a support pin 18 that pivotally supports the tilt base 17. 27 are fixed to the tips of these protrusions 11i with screws.

A pinion 29 is pivotally attached to the tip of the support pin 18 and is fixed to the outer surface of the tilt base 17. A drive gear 27a fitted to the output shaft of the geared motor 27 meshes with this pinion 29.

On the other hand, a rack member 30 is attached to the side of the carriage 23, and this rack member 30 meshes with the pinion 29 described above. That is, the geared motor 27 is operated to apply a driving force to the carriage 23 so as to reciprocate along the guide shaft 20.

In addition, since the pinion 29 is attached to the support bin 18 coaxially with the tilt base 17, when the tilt servo operation described below is performed, the drive gear 27a meshing with the pinion 29 moves away from and approaches the pinion. The pinion 29 moves as the tilt base 17 swings.
It will revolve around. By adopting such a configuration, the geared motor 27 can be mounted not on the tilt base 17 but on the fixed support member 11, and therefore, the movable parts including the tilt base 17 and the guide shaft 20 can be mounted. The weight is reduced and the response of the tilt servo is improved, and vibrations generated by the geared motor 27 are prevented from being transmitted to the pickup.

Next, the means for determining the rocking position of the tilt base 17 will be explained.

As shown in FIGS. 1 to 3 and 5, a total of four protrusions 11j and llk, two protrusions 11j and llk, are formed near the end of the side wall 11b of the support member 11. A bracket 32 made of a bent steel plate is fixed to the tip with a screw.

A motor 34 having an output shaft fitted with a worm 33 is attached to the bracket 32 . Further, the bracket is provided with a worm wheel 35, and the worm 33 and the war wheel 35 mesh with each other. A worm 36 is formed coaxially and integrally with the worm wheel 35, and a drive nut 37 attached to the free end of the tilt base 17 is screwed into the worm 36.

On the other hand, an overhang 11g is formed at the lower end of the support member 11, and between the overhang and the free end of the tilt base 17, the tilt base 17 is moved in the direction of arrow P in FIG. A biasing tension coil spring 38 is interposed.

That is, by rotating the motor 34 in forward and reverse directions, the tilt base 17 is swung and positioned about the support bin 18. Although not shown, a swing angle detection means for detecting the swing angle of the tilt base 17 is provided. Also,
Although not shown, relative angle detection means is provided for detecting the relative angle between the optical axis of the irradiation light emitted from the optical pickup toward the disk recording surface and the disk recording surface.

The above-mentioned bracket 32, worm 33, motor 34,
Worm wheel 35, worm 36, drive nut 37
The tension coil spring 38, the swing angle detection means, and the relative angle detection means constitute a positioning means for determining the swing position of the tilt base 17. Further, the positioning means and the tilt base 17 constitute a tilt servo means for controlling the optical axis of the irradiation light emitted from the optical pickup so that it always intersects at right angles with the disk recording surface. In the information recording disc player, the tilt base 17 is swung as the carriage 23 moves, thereby maintaining the optical axis of the information reading beam and the disc recording surface perpendicular to each other.

Effects of the Invention As described in detail above, in the information recording disc player according to the present invention, the longitudinal support member supporting the guide means for guiding the pickup and the spindle motor and extending in the direction in which the pickup is to be guided is provided at the bottom and at the bottom. It has a plurality of side walls connected so as to intersect with the bottom, and is formed so that the cross section perpendicular to the above direction has a substantially gutter-like shape, and the wall surfaces of the side walls are non-parallel to each other. I am trying to be like that.

Because of this structure, the rigidity of the support member is extremely high, and the amount of distortion of the support member when external force is applied is kept to an extremely small level, so that the reading of recorded information by the pickup is always performed smoothly without being affected. be. In addition, since the wall surfaces of each side wall of the support member are non-parallel to each other, there is no interference between waves incident on the convex wall surface and reflected waves, and the generation of standing waves that adversely affect information reading by the pickup. It is being prevented.

[Brief explanation of drawings]

FIG. 1 is a diffused exploded perspective view of the main parts of an information recording disc player as an embodiment of the present invention, and FIGS.
FIGS. 4 and 5 are respectively a plan view and a front view of the apparatus shown in FIG. FIG. 2 is a perspective view of main parts of the information recording disc player of FIG. Explanation of symbols of main parts 11...Support member 11a...Bottom part 11b, llc, lid. 13...Spindle motor 14...Disk 17...Tilt base 27...Geared motor 34...Motor lie...Side wall Department

Claims (1)

[Claims] An information recording disc player comprising a guide means for guiding a pickup and a longitudinal support member carrying a spindle motor and extending in a direction in which the pickup is to be guided, the support member being a bottom portion and intersecting with the bottom portion. Information characterized in that it has a plurality of sidewalls connected in a manner similar to the above, and is formed so that a cross section perpendicular to the direction has a generally gutter-like shape, and the wall surfaces of each of the sidewalls are non-parallel to each other. Recording disc player.