JP2001351251A - Recording and reproducing device for disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk recording and reproducing device which enables easily performing tilt adjustment of respective guide shafts, with respect to disk recording surface, while miniaturizing the device as a whole. SOLUTION: The moving direction of a head 4 for a chassis 1, formed into a nearly rectangular shape, is set in an inclined direction ranging from the central part to a corner part of the chassis 1. A lead pitch p1 of an adjusting screw 13, which adjusts the displacement of one end side of one guide shaft 7 and a lead pitch p2 of an adjusting screw 18, which adjusts the displacement of one end side of the other guide shaft 8 are made to correspond to the ratio of support spans L1, L2 which range from support parts (a), (b) to adjusting parts (b), (d) and are set, so as to establish the relation L1:L2=p1:p2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for recording and reproducing discs such as DVDs, CDs, and video CDs.

[0002]

2. Description of the Related Art Conventionally, a disk recording / reproducing apparatus of this type basically includes a head driving mechanism for reproducing information recorded on a disk or driving a head for recording information on the disk in a radial direction of the disk. Two guide shafts which are inserted into the bearings of the head and guide the head movably in the radial direction of the disk, and position adjustment of one end of each of the guide shafts in a direction approaching or away from the recording surface of the disk. And a tilt adjusting means for adjusting the angle of the guide shaft with respect to the recording surface of the disk, and a rectangular chassis for accommodating them.

The tilt adjusting means adjusts one end of each guide shaft toward and away from the recording surface of the disk by means of a rotation adjusting member, and adjusts the swing of each guide shaft about a fulcrum at the other end. (Tilt adjustment). This allows
The parallelism of each guide axis to the recording surface of the disk is secured with high precision, and the axis of the light beam emitted from the head is adjusted at right angles to the recording surface of the disk to realize highly efficient information reading. I have.

In a disk recording / reproducing apparatus, when the head moves to the outer periphery of the information track of the disk, the head projects outward from the outer peripheral end of the disk. Is a major factor in determining the size of

[0005] Therefore, the moving direction of the head is set so as to be inclined from the center of the chassis to the corner, so that the head moved to the outermost periphery of the information track of the disk fits in the space inside the corner of the chassis. By doing so, the size of the chassis is reduced.

[0006]

By the way, in this type of disk recording / reproducing apparatus, particularly, a disk recording / reproducing apparatus for a vehicle, it is desired to secure a space for incorporating various mechanisms and equipment and to minimize the space. Due to demands, the chassis is not always square. Also, the center of rotation of the disk is not always set at the center of the chassis. As a result, when the moving direction of the head is set to the inclined direction from the center part to the corner part of the chassis as described above, the outer ends of the two guide shafts for guiding the head are close to the outer peripheral part of the chassis. And the length of both guide shafts may be different. In this case, since the rotation adjusting member in the tilt adjusting means of the guide shaft is provided near the end of the guide shaft, the support span between the fulcrum-side portion of each guide shaft and the adjusting portion is different.

Further, although the lengths of the two guide shafts are the same, the support span between the fulcrum portion and the adjustment portion of the support member supporting the guide shafts may be different between the two guide shafts.

On the other hand, conventionally, an adjusting screw having the same lead pitch has been used as a rotation adjusting member of each adjusting portion. Therefore, even if the adjustment screw is rotated by the same amount to adjust the displacement of one end of each guide shaft by the same amount, since the support span of each guide shaft is different, the inclination angle of each guide shaft with respect to the disk recording surface is adjusted. The amount (tilt adjustment angle) will be different.

That is, in order to change the inclination angle of the guide shaft with respect to the disk recording surface by a predetermined amount, the amount of adjustment of the adjustment screw is different for each guide shaft, and the tilt adjustment characteristics are different for each guide shaft. . Therefore, when adjusting the tilt while associating both guide shafts with each other,
There was a problem that a delicate tilt adjustment operation was difficult to perform.

The present invention solves the above-mentioned conventional problems, and delicately adjusts the tilt of both guide shafts with respect to the disk recording surface while rationally setting the head moving direction to reduce the size of the entire apparatus. An object of the present invention is to provide a disk recording / reproducing apparatus which can be easily performed.

[0011]

In order to achieve this object, a disk recording / reproducing apparatus according to the present invention sets a moving direction of a head with respect to a chassis in an inclined direction from a center to a corner of the chassis. Each of the guide shafts includes a displacement adjustment amount with respect to a unit operation amount of a rotation adjustment member that adjusts displacement of one end of the guide shaft and a displacement adjustment amount with respect to a unit operation amount of a rotation adjustment member that adjusts displacement of one end of the other guide shaft. Are different from each other in accordance with the ratio of the support span from the fulcrum portion to the adjustment portion.

With this configuration, even if the support span of each guide shaft is different, the angle of each guide shaft is adjusted by the same amount with respect to the disk recording surface by the same amount of rotation adjustment of the rotation adjusting member on each guide shaft. Thus, a disk recording / reproducing apparatus having the same tilt adjustment characteristics of both guide shafts can be obtained.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention provides a head drive mechanism for reproducing information recorded on a disk or driving a head for recording information on the disk in a radial direction of the disk; Two guide shafts which are inserted into bearings of the head and guide the head movably in the radial direction of the disk, and adjust the positions of one end of these guide shafts in a direction to be far from the recording surface of the disk. hand,
A tilt adjusting means for adjusting the angle of the guide shaft with respect to the recording surface of the disc, and a substantially rectangular chassis for accommodating the tilt adjusting means, wherein the tilt adjusting means is provided at one end of each guide shaft by a rotation adjusting member. A disk recording / reproducing apparatus configured to adjust the distance to a recording surface and to swing and displace each guide shaft around a fulcrum at the other end, wherein a moving direction of the head with respect to the chassis is adjusted by a chassis. Of the rotation adjustment member for adjusting the displacement of one end of one of the guide shafts and the rotation of the other guide shaft for adjusting the one end of the other guide shaft. The amount of displacement adjustment with respect to the unit operation amount of the adjustment member is made different from each other in accordance with the ratio of the support span from the fulcrum site to the adjustment site in each guide shaft. And characterized in, thereby having the following effects.

That is, even if the support span of each guide shaft is different, the same amount of rotation adjustment of the rotation adjustment member of each guide shaft is used to adjust the tilt of each guide shaft with respect to the disk recording surface by the same amount. Can be.

According to a second aspect of the present invention, there is provided the disk recording / reproducing apparatus according to the first aspect, wherein the head drive mechanism is configured to be a screw feed type, and one of the two guide shafts is connected to the head drive mechanism. It is characterized by being constituted by a screw shaft driven by a traverse motor, and thereby has the following operation.

That is, by using one of the guide shafts and the screw shaft for moving the head, the number of parts of the head drive mechanism can be reduced and the size can be reduced.

According to a third aspect of the present invention, there is provided the disk recording / reproducing apparatus according to the first or second aspect, wherein at least one of the rotation adjusting members is adjustable from the opposite side of the disk. This has the following effects. That is, the rotation adjusting member can be easily adjusted without the disk being in the way.

According to a fourth aspect of the present invention, there is provided the disk recording / reproducing apparatus according to any one of the first to third aspects, wherein the tilt adjusting means adjusts one end of each guide shaft by a spring. While biasing toward one side,
The adjustment screw regulates the movement in the biasing direction,
By changing the contact restriction position by the adjusting screw, each guide shaft is swingably displaced about the fulcrum portion on the other end side, and the lead pitch of the adjusting screw for adjusting the displacement of one end side of one guide shaft and The lead pitch of the adjustment screw for adjusting the displacement of one end of the other guide shaft is different from each other in accordance with the ratio of the support span from the fulcrum portion to the adjustment portion in each guide shaft. This has the following effects.

That is, even if the support span of each guide shaft is different, it is possible to adjust the tilt of each guide shaft by the same angle with respect to the disk recording surface by the rotation adjustment operation of the same amount of the adjusting screw in each guide shaft. it can. Further, the position of the guide shaft can be maintained without play by biasing the spring in one adjustment direction.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG.

FIG. 1 shows an example of a disk recording / reproducing apparatus according to the present invention. Specifically, a main body portion of a car navigation apparatus which is a DVD reproducing apparatus incorporated in an operation panel of an automobile is viewed from the back side. FIG.
FIG. 2 is a schematic perspective view in which main parts are enlarged.

In this disk recording / reproducing apparatus, a traverse chassis 2 is mounted in a floating manner inside a chassis 1 formed into a thin rectangular shape by sheet metal pressing, and a disk D is mounted on the traverse chassis 2.
Loading mechanism (not shown), a disk driving motor 3, an information reproducing head 4, a head driving mechanism 5 for moving (traversing) the head 4 in the radial direction of the disk D, and a circuit board provided with a recording and reproducing circuit 6, etc. are assembled.

In FIG. 1, the disk D is mounted concentrically on a rotation output section of a disk drive motor 2 in a horizontal posture with its information recording surface facing upward, and a head 4 emits a light beam for reading information from the disk. The information recording surface of D is arranged so as to irradiate the information recording surface, is guided by being inserted through two guide shafts 7 and 8 arranged in parallel with each other, and is supported movably in the radial direction of the disk D.

The head drive mechanism 5 is of a screw feed type. One guide shaft 7 is provided with a spiral groove m on the outer periphery for screwing with a nut 4a provided at the end of the head 4. The guide shaft 7 is connected to a traverse motor 9 via a gear reduction mechanism 10, and the guide shaft 7 is rotated forward and reverse by the traverse motor 9. The head 4 is reciprocated in the radial direction of the disk D.

Here, the head moving direction A is set to an inclination direction of about 45 degrees from the center to the corner of the main body chassis 1. Specifically, with respect to the loading direction L of the disc D by the disc loading mechanism,
The head moving direction A is set to a direction inclined obliquely forward by about 45 degrees. Therefore, when the head 4 moves to the outermost peripheral portion of the information track of the disk D, the head 4 fits in the inner corner space of the main chassis 1. With such a configuration, planar miniaturization of the chassis 1 is achieved.

The chassis 1 is not limited to a rectangular shape but may have the following shape. That is, it is needless to say that the chassis 1 may be basically rectangular in shape, but may be chamfered at corners other than the corners where the heads 4 are stored. In the claims, the chassis 1 is expressed as a substantially rectangular shape to include such a shape.

In the disk recording / reproducing apparatus, it is necessary that the axis of the light beam of the head 4 is perpendicular to the information recording surface of the disk D with high accuracy. Means for adjusting (tilt adjustment) so that each guide shaft 7, 8 is parallel to the surface is provided.

Here, one guide shaft 7 which is also used as a head drive screw shaft is used as a main guide shaft, and its drive side end is fixed at a height position as a reference point (a).
The three ends (b), (c), and (d) of the outer end of the guide shaft 7 and both ends of the guide shaft can be adjusted in the near and far directions with respect to the disk D.

As shown in FIG. 3, an outer end of the guide shaft 7 is supported by a bearing member 11, and the bearing member 11 is supported by a plate-shaped spring 12 having one end connected to the traverse chassis 2. The bearing 12 is attached to the end, and the elastic deformation of the spring 12 allows the bearing member 11 to move in the near and far directions with respect to the disk D. In other words, one outer end of the guide shaft 7 is supported so as to be swingable in the near and far directions with respect to the disk D with the other end linked to the gear reduction mechanism 10 as a fulcrum. An adjusting screw 13 serving as a rotation adjusting member is mounted on the support piece 2b extended from the traverse chassis 2 so as to face a receiving piece 12a cut out at the free end of the spring 12 and a spring 12 is provided. The tip of the adjustment screw 13 restricts the contact of the bearing member 11 from moving toward the direction away from the disc D by the elasticity of the bearing member 11. Therefore, by screwing the adjusting screw 13, one end of the guide shaft 7 can be displaced toward the disk D against the leaf spring 12, and by loosening the adjusting screw 13, one end of the guide shaft 7 can be moved. The spring 12 can be displaced in a direction away from the disk D by an elastic biasing force.

As shown in FIG. 4, both ends of the other guide shaft 8 are provided with concave portions 14a, 1 of resin bearing blocks 14, 15, which are fixed to the traverse chassis 2.
5a, both free ends 16c, of a plate-shaped spring 16 supported so as to be displaceable only in the near and far directions with respect to the disk D and having an intermediate portion connected and supported by the traverse chassis 2.
Both ends of the guide shaft 8 are received and supported by 16d, and both ends of the guide shaft 8 are pressed and urged away from the disk D by the elasticity of the spring 16.

The support pieces 2c and 2d extending from the traverse chassis 2 are provided with adjusting screws 17 and 18 as rotation adjusting members facing both ends of the guide shaft 8, respectively. The ends of the adjusting screws 17 and 18 restrict the abutting movement of the guide shaft 8 in the direction away from the disk D by the elasticity so that the guide shaft 8 holds the posture of the guide shaft 8 with respect to the disk D. I have.

The three portions (b), (c), and (d) on the end portions of the guide shafts 7 and 8 are position-adjustable in the far and near directions with respect to the disk D as described above. b), (c), (d) each adjustment screw 13,1
By adjusting the guide shafts 7 and 8 so as to be parallel to the information recording surface of the disk D by adjusting the forward and backward movements of the heads 7 and 18, the optical axis of the head 4 can be adjusted with respect to the information recording surface. Can be set at right angles.

When the axis of the light beam of the head 4 is perpendicular to the information recording surface, the signal reading efficiency becomes highest. Therefore, in the actual adjustment operation, the information reading of the inspection disk is performed by the head 4. Is performed, and each part (b), (c),
The adjustment in (d) will be performed.

The above configuration and adjustment operation are basically the same as those of the prior art. However, in the present invention, the following contrivances have been made in order to further facilitate the delicate tilt adjustment operation.

That is, when the moving direction of the head 4 is set to the inclined direction from the center of the main body chassis 1 to the corner as described above, the outer sides of the two guide shafts 7 and 8 for guiding the head 4 are set. Since the end portion is supported near the outer peripheral portion of the main body chassis 1, depending on the shape of the main body chassis 1, the arrangement space of other mechanisms and equipment to be incorporated, and the like,
The two guide shafts 7, 8 are not supported symmetrically at all, and the lengths of the two guide shafts 7, 8 are different. In this case, the adjusting screw 1 of the outer guide shaft adjusting means
Since 3 and 18 are arranged near the ends of the guide shafts 7 and 8,
The support span L1 between the fulcrum-side part a and the adjustment part b of each guide shaft 7 is different from the support span L2 between the fulcrum-side part c and the adjustment part d of the guide shaft 8.

If the adjusting screws 13 and 18 have the same lead pitch, the adjusting screws 13 and 18 are rotated by the same amount because the supporting spans L1 and L2 of the guide shafts 7 and 8 are different. Even if one end of each of the guide shafts 7 and 8 is displaced and adjusted by the same amount by operation, the amount of adjustment of the inclination angle of each of the guide shafts 7 and 8 with respect to the disk recording surface becomes different. for that reason,
The tilt adjustment characteristics are different from each other, and when each is finely adjusted, it is easy to perform an excessive operation or an insufficient operation.

Therefore, in the present invention, as shown in FIG.
The lead pitch (movement amount per rotation) of the adjusting screw 13 with respect to the guide shaft 7 having the smaller support span L1 is p
1. Assuming that the lead pitch of the adjusting screw 18 with respect to the guide shaft 8 having the larger support span L2 is p2, L1: L2 = p
The lead pitches p1, p2 of the adjusting screws 13, 18 are set differently so that 1: p2.

As described above, by setting the lead pitches p1, p2 of the adjusting screws 13, 18 in proportion to the supporting spans L1, L2 of the guide shafts 7, 8, the adjusting screws 13, 18 are adjusted. Are rotated by the same amount in the same direction, and the amount of adjustment of the inclination angle of each guide shaft 7, 8 with respect to the disk recording surface is the same. That is, it is easy to make the tilt adjustment characteristics of the guide shafts 7 and 8 equal to each other and to finely adjust each of the guide shafts 7 and 8 without any mistakes.

The present invention can be embodied in the following modes.

Even if both guide shafts 7 and 8 have the same length,
A similar problem is brought about when the supporting span of the supporting member supporting each of the guide shafts 7 and 8 is different from the supporting span between the supporting point portion and the adjusting portion, and the present invention can be applied.

In the above embodiment, all the adjustment parts can be adjusted from the side opposite to the disk D so that the adjustment workability is high. It is also possible to do from the side.

The head drive mechanism 5 slides and guides the head 4 with two dedicated guide shafts, and drives the head 4 with another screw shaft provided in parallel with these.
Can also be configured.

As the rotation adjusting member, besides using the adjusting screw as described above, a rotating cam can be used. In this case, the cam profile of each cam is made different according to the support span of each guide shaft, so that the tilt adjustment characteristics for each guide shaft can be made the same.

In the above-described embodiment, the present invention is embodied in a car navigation device having a disk reproducing function. However, the present invention is not limited to such a device, and the present invention is not limited to such a device. Playback device, C
It goes without saying that any device that performs recording / reproduction on a disk-shaped recording medium such as a D recording / reproducing device can be used.

[0045]

As described above, according to the present invention, the head moving direction is set in the inclined direction from the center part to the corner part of the chassis, thereby reducing the size of the chassis. Even if the support spans of the guide shafts are different, the tilt adjustment characteristics of each guide shaft can be made equal, the head moving direction can be rationally set, the size of the entire apparatus can be reduced, and the subtle tilt can be achieved. The effect of being able to provide a disk recording / reproducing device that can easily perform the adjusting operation is obtained.

[Brief description of the drawings]

FIG. 1 is a plan view showing a main part of a disk recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is an enlarged schematic perspective view of a main part of the disk recording / reproducing apparatus according to the embodiment.

FIG. 3 is a perspective view showing an adjustment portion of an outer end of one guide shaft.

FIG. 4 is a perspective view showing a support structure for the other guide shaft.

FIG. 5 is a side view showing a correlation between support states of each guide shaft.

[Explanation of symbols]

 Reference Signs List 1 chassis 4 head 5 head drive mechanism 7 guide shaft 8 guide shaft 9 traverse motor 12 spring 13 rotation adjustment member (adjustment screw) 16 spring 18 rotation adjustment member (adjustment screw) D disk L1 support span L2 support span p1 lead pitch p2 lead pitch

Claims (4)

[Claims] A head drive mechanism for driving a head for reproducing information recorded on the disk or recording information on the disk in a radial direction of the disk; Two guide shafts that are movably guided in the directions, and adjust the position of one end of these guide shafts in a direction toward and away from the recording surface of the disk to adjust the angle of the guide shaft with respect to the recording surface of the disk. A tilt adjusting means, and a substantially rectangular chassis for accommodating the tilt adjusting means, wherein the tilt adjusting means adjusts one end of each guide shaft toward and away from the recording surface of the disc by a rotation adjusting member, and adjusts each of the guides. A disk recording / reproducing apparatus configured to pivotally displace a shaft around a fulcrum portion on the other end side, wherein a moving direction of the head with respect to the chassis is: The tilt adjustment direction is set from the center to the corner of the chassis, and one end of one guide shaft is adjusted to be displaced and adjusted with respect to a unit operation amount of the rotation adjusting member, and one end of the other guide shaft is adjusted to be displaced. A disc recording / reproducing apparatus, wherein a displacement adjustment amount with respect to a unit operation amount of the rotation adjusting member is different from each other in accordance with a ratio of a support span from a fulcrum portion to an adjustment portion in each guide shaft. 2. The disk recording / reproducing apparatus according to claim 1, wherein the head drive mechanism is configured to be of a screw feed type.
A disk recording / reproducing apparatus, wherein one of the two guide shafts is constituted by a screw shaft driven by a traverse motor. 3. The disk recording / reproducing apparatus according to claim 1, wherein at least one of the rotation adjusting members is configured to be adjustable from the opposite side of the disk. Recording and playback device. 4. The disc recording / reproducing apparatus according to claim 1, wherein said tilt adjusting means urges one end of each guide shaft toward one side in an adjusting direction by a spring. The adjustment screw regulates the movement of the guide shaft in the biasing direction, and by changing the contact restriction position by the adjustment screw, each guide shaft is pivotally displaced around the fulcrum at the other end. The lead pitch of the adjusting screw for adjusting the displacement of one end of one guide shaft and the lead pitch of the adjusting screw for adjusting the displacement of one end of the other guide shaft are defined by the distance between the fulcrum portion and the adjusting portion of each guide shaft. A disc recording / reproducing apparatus, which differs from each other in accordance with the ratio.