JP2003288763A - Feed mechanism of disk reading apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a feed mechanism of a disk reading apparatus which facilitates molding, which does not require a severe dimension management, and which also further securely prevents the droppage due to a large impact. <P>SOLUTION: A first engagement protrusion 34i capable of being engaged with a screw groove 32a is fixed to the main body of the disk reading apparatus. A second engagement protrusion 34j engaged with the screw groove 32a in the position apart from the first engagement protrusion 34i and having elasticity is fixed to the main body of the disk reading apparatus. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feeding mechanism of a disc reading apparatus, and more particularly, to a disc medium diametrical direction by moving the disc reading apparatus forward and backward along the axial direction in association with rotation of a lead screw. The present invention relates to a feeding mechanism that moves a disk reading device.

[0002]

2. Description of the Related Art Conventionally, a magnetic disk or a CD-R
A disk reading device for reading an optical disk such as an OM or a DVD-ROM (including recording / recording) has a disk medium by moving the disk reading device forward / backward along the axial direction as the lead screw rotates. There is known a device (lead screw system) in which an optical disk reading device is moved in the diametrical direction.

4 (A) and 4 (B) show an example of a feed mechanism adopting such a lead screw system (see Japanese Utility Model Publication No. 2-29577). In FIG. 4 (A),
Reference numeral 1 is a magnetic head for reading information recorded on a magnetic disk (not shown), 2 is a disk reading apparatus main body holding the magnetic head 1 (overall view is omitted), and 3 and 4 are a pair of the disk reading apparatus main body 2 and an integral pair. It is a supporting leg.

Through holes 3a and 4a are formed on the surfaces of the support legs 3 and 4 which face each other. This through hole 3
As shown in FIG. 4 (B), a guide rail 5 for guiding the disc reading apparatus body 2 extends through both a and 4a so as to extend therebetween. The guide rail 5 is also provided on the other end side (not shown) of the disc reading device body 2. Further, a cylindrical spring accommodating hole 3b is formed on the protruding end surface of the support leg portion 3. The coil spring 6 is housed in the spring housing hole 3b so that a part of the coil spring 6 is exposed. Further, a pair of female screw holes 4b are formed in the projecting end surface of the support leg portion 4. A screw 8 for fixing the base plate 7 to the protruding end surface of the support leg portion 4 is screwed into the female screw hole 4b.

On the other hand, a plate 10 is fixed to the base plate 7 via screws 9. A guide pin 11 having a tapered tip is provided in the middle of the plate 10. A coil spring 6 is elastically contacted with the back surface of the plate 10 near the tip.

The tip of the guide pin 11 engages with the screw groove 12a of the lead screw 12 which is rotated by the driving of a motor (not shown), and when the lead screw 12 rotates, the guide pin 11 is inserted into the screw groove 12a. The tip is guided and the disc reader 2
While being guided by the guide rail 5, the lead screw 1
2. Move along the axis direction of 2. At this time, the bending of the plate 10 caused by the movement of the disc reading device 2 is absorbed by the elasticity of the coil spring 6.

[0007]

By the way, in the feeding mechanism of the disk reading apparatus constructed as described above, since one guide pin 11 is engaged with the screw groove 12a, this engaging portion is formed. When a large impact is applied to the plate (for example, vibration from the vehicle body when used as a vehicle-mounted disk reading device), the bending of the plate 10 cannot be completely absorbed by the coil spring 6, and the guide pin 11 falls off from the screw groove 12a. There was a problem that it would end up.

Therefore, as shown in FIGS. 3A to 3C, the plate 10 is replaced with a thin leaf spring plate 13 having elasticity, and the tip of the leaf spring plate 13 is provided with a screw 14 therebetween. Fix the resin engagement member 15,
The engaging member 15 is provided with a pair of engaging projections 15a and 15b which are engaged with two spaced apart screw grooves 12a of the guide screw 12 at the same time, and the leaf spring plate 13 is momentarily bent due to a large impact. Even if the engaging protrusion 1
It is conceivable that one of 5a and 15b is configured so as not to fall off as long as it is engaged with the screw groove 12a (see Japanese Patent Laid-Open No. 11-328886).

However, when such a pair of engaging protrusions 15a and 15b are integrally formed on the resin engaging member 15, the molding error of the screw groove 12a which continues spirally and the engaging protrusions 15a and 15b are formed. Molding error (engaging member 15
It is difficult to maintain a reliable engagement state due to sink marks during molding of the screw (the occurrence of backlash and cramped engagement), and the cross-sectional shape of the screw groove 12a and the engagement protrusions 15a and 15b.
There was also a problem that the molding was forced to take into consideration delicate dimensional control such as the cross-sectional shape of the.

Further, the engaging member 15 is a leaf spring plate 13.
Since it is a separate hard resin, the number of parts is increased and the assembling work and assembling accuracy are required, and it is hard to say that it has been sufficiently shock-absorbed (falling prevention).

In order to solve the above problems, the present invention not only facilitates molding, but also eliminates the need for strict dimensional control, and more reliably prevents the disc from falling off due to a large impact. It is an object to provide a feeding mechanism of a reading device.

It is another object of the present invention to provide a feed mechanism for a disc reading apparatus which can reduce the number of parts and the cost of assembling work. Further, it is an object of the present invention to provide a feeding mechanism of a disc reading device capable of ensuring a large contact area with respect to the screw groove and further improving the fall-off preventing effect.

[0013]

In order to achieve the object, a feeding mechanism of a disk reading apparatus according to claim 1 comprises:
A first engaging protrusion fixed to the disc reading device main body and engageable with a screw groove of a lead screw which is rotated by a driving source; and a first engaging protrusion fixed to the reading device main body. And a second engaging protrusion that is elastic and that engages with the screw groove at a position spaced apart from each other.

According to a second aspect of the present invention, there is provided a feed mechanism for a disc reading apparatus, wherein the first and second engaging projections are plates made of one thin metal plate having elasticity and fixed to the body of the disc reading apparatus. Is formed integrally with
The gist is that the second engagement protrusion has independent elasticity.

Further, in the feeding mechanism of the disk reading apparatus according to a third aspect of the present invention, at least one of the first and second engaging projections has a ridge line that matches a pitch inclination angle of the screw groove. To do.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of a feeding mechanism of a disk reading device of the present invention will be described for an optical pickup device, with reference to the drawings. In FIG. 2, 21 is an optical pickup device having an objective lens 22 facing an optical disc (not shown), 23 is a disc reading device body to which the optical pickup device 21 is fixed, and 24 is one of the disc reading device body 23. Then, a guide rail 25 for guiding one of the two is a feeding mechanism portion arranged on the other side of the disk reading device body 23.

The feed mechanism section 25 includes a drive motor 27 fixed to the apparatus main body 26 and an output shaft 27a of the drive motor 27.
A drive gear 28 fixed to the drive gear 28, an intermediate gear 29 that meshes with the drive gear 28, and a driven gear 30 that meshes with the intermediate gear 29.
The driven gear 30 is fixed in a penetrating state and the shaft member 32 is rotatably held by brackets 31 having both ends fixed to the device body 26, and the disk reading device body 23 is screwed through screws 33. And a fixed plate 34.

The disk reading device main body 23 has a pair of leg portions 23a having through holes through which the shaft member 32 penetrates.
23b is formed. In addition, positioning protrusions 23c and 23d are formed on the disk reading device body 23 so as to project therefrom.

The shaft member 32 which also serves as a lead screw has an axis parallel to the guide rail 24, and a screw groove 32a is formed near the center thereof so as to be located between the leg portions 23a and 23b.

The plate 34 is formed of a thin metal plate having elasticity and has positioning holes 34a and 34b which are positioned by the projections 23c and 23d penetrating through and at the same time rotation of which is restricted by the screw 33 as a fulcrum. Base part 3 formed
4c and the leg portions 23a and 23b, and the engaging tongue piece portion 3 extending along the axial direction of the shaft member 32.
4d is integrally formed.

The engaging tongue portion 34d is, as shown in FIG.
A first elastic portion 34f, which has a relatively hard elasticity and is continuous with the base portion 34c with an opening 34e formed at a boundary portion with the base portion 34c interposed therebetween, and from the first elastic portion 34f along the axial direction of the shaft member 32. A second elastic portion 34h, which has a relatively soft elasticity and is independent of the first elastic portion 34f, is provided by a bent portion 34g that projects and is located at the boundary with the first elastic portion 34f.

The screw groove 32a is formed in the first elastic portion 34f.
A first engaging protrusion 34i that engages with the second engaging portion 34h is formed, and a second engaging protrusion 34j that engages with the screw groove 32a is formed on the second elastic portion 34h at a position separated from the first engaging protrusion 34i. Has been formed.

These first and second engaging projections 34i, 3
4j is in a state in which the second engaging projection 34j is projected toward the screw groove 32a side more than the first engaging projection 34i by the bent portion 34g, and as shown in FIG.
When the second engaging protrusion 34j is engaged with the screw groove 32a without being sized according to the design dimension, the bent portion 34g is absorbed and the engaging tongue portion 34d is set as if it were flat (basic setting). ) Has been. In addition, the first and second engagement protrusions 34i and 34j are
Has a ridge line 34k, 34l that extends in the width direction intersecting the axial direction of the above and further matches the pitch inclination angle of the screw groove 32a.

In the above structure, the plate 34 is formed by a single punching process using a material made of a thin metal plate, and the positioning holes 34a and 34b, the base portion 34c, the engaging tongue portion 34d, the opening 34e, The one elastic portion 34f, the bent portion 34g, the second elastic portion 34h, the first engaging protrusion 34i, the second engaging protrusion 34j, and the ridge lines 34k and 34l can all be formed at the same time.

The plate 34 has projections 23c, 23
With the positioning holes 34a and 34b engaged with d, it can be fixed to the disc reading device main body 23 with one screw 33.

In this state, the first and second engaging projections 34
When i and 34j are engaged with the screw groove 32a, the first engaging protrusion 34i formed on the first elastic portion 34f having relatively hard elasticity is used as a main guide for guiding the screw groove 32a. The second engaging protrusion 34j formed on the second elastic portion 34k having relatively soft elasticity is guided to the screw groove 32a for absorbing shock.

The second engaging projection 34j has elasticity independent of the first engaging projection 34i, and
Along with the locus (see arrow B in FIG. 1B) as if the ridge line 34l rotates about the bent portion 34g as a fulcrum, that is, the ridge line 34l is not simply displaced in the vertical direction, With the position of the engagement protrusion 34i substantially unchanged, for example, a subtle pitch error generated in the screw groove 32a,
It is possible to engage with the screw groove 32a while absorbing a subtle error generated in the separation distance between the ridgelines 34k and 34l.

Further, since each of the ridge lines 34k and 34l is along the pitch inclination angle of the screw groove 32a, it is possible to secure a wide contact area with the screw groove 32a (a wide contact range width). In the first engaging protrusion 34i provided on the first elastic portion 34f that is relatively hard,
It is possible to favorably maintain the engaged state with the screw groove 32a for the main guide (improvement of the lock mechanism and the impact drop performance). Further, the second engaging projection 34j provided on the relatively soft second elastic portion 34h can exert a further function for absorbing backlash.

[0029]

As described above, in the feeding mechanism of the disc reading device according to the first aspect, the screw mechanism of the lead screw which is fixed to the body of the disc reading device and rotates under the drive of the driving source is engaged. A first engaging protrusion that can be fitted and a second engaging protrusion that is fixed to the reading device main body and that engages with the screw groove at a position separated from the first engaging protrusion and has elasticity. With the provision, not only the molding is easy and the strict dimensional control is not required, but also the falling off due to a large impact can be more surely prevented.

Further, in the feeding mechanism of the disc reading device according to the present invention, the first and second engaging protrusions are one thin metal plate having elasticity fixed to the disc reading device main body. Since the second engaging projection is provided with independent elasticity while being integrally formed on the plate made of, it is possible to reduce the number of parts and also the assembly work cost.

Further, in the feeding mechanism of the disk reading apparatus according to the third aspect, at least one of the first and second engaging projections has a ridge line that matches the pitch inclination angle of the screw groove. As a result, a large contact area with the screw groove can be ensured, and the fall prevention effect can be further improved.

[Brief description of drawings]

1A and 1B show a feeding mechanism of a disk reading device according to an embodiment of the present invention, FIG. 1A is a plan view of a plate, and FIG.
Is a cross-sectional view taken along the line AA of FIG. 1A, and FIG.

FIG. 2A is a plan view of a disk reader, FIG.
FIG. 3B is a side view of the disc reading device.

FIG. 3 shows a feeding mechanism of a conventional disc reading device,
(A) is a plan view of the main part, (B) is a front view of the main part, (C)
Is an explanatory diagram of a usage state.

4A and 4B are views showing a feeding mechanism of another conventional disk reading device, FIG. 4A is an exploded perspective view of a main part, and FIG. 4B is a sectional view of the main part.

[Explanation of symbols]

23 ... Disk reader main body 25 ... Feeding mechanism section 27 ... Drive motor (drive source) 32 ... Shaft member (lead screw) 32a ... screw groove 34 ... Plate 34c ... Base part 34i ... First engaging protrusion 34j ... Second engaging protrusion 34k ... ridge 34l ... ridge

Claims (3)

[Claims] 1. A first engaging projection fixed to a disk reading device main body and engageable with a screw groove of a lead screw which is rotated by a driving source, and a first engaging projection fixed to the reading device main body. A feed mechanism for a disk reader, comprising: a second engaging protrusion that is elastic and that engages with the screw groove at a position separated from the first engaging protrusion. 2. The first and second engaging projections are integrally formed on a plate made of one thin metal plate having elasticity and fixed to the body of the disk reading device, and the second engaging projection is also formed. The feeding mechanism of the disk reading device according to claim 1, wherein the compound protrusion has independent elasticity. 3. The disc reading device according to claim 1, wherein the at least one of the first and second engaging protrusions has a ridge line that matches a pitch inclination angle of the screw groove. Feeding mechanism.