JPH08287626A - Feed mechanism - Google Patents

Abstract

PURPOSE: To simplify the assembly work and to simply and inexpensively manufacture a feed screw by equalizing an outer diameter of the feed screw along the whole length in the axial direction and providing a screw part along the whole length. CONSTITUTION: A screw pawl 56 is provided on the middle part of a housing 52 of an optical pickup 45, and is brought into press-contact with the feed screw 46. The feed screw 46 is energized by an L-shaped leaf spring 51 fixed to the outer side of a side of a bearing hole 32b to the side of the other bearing hole 32c. A driven gear 47 at the end part of the leaf spring is connected via a speed reducer to a rotary shaft of a motor. When the motor is driven, the feed screw 46 is rotated to move the screw pawl 56, and the optical pickup 45 is moved in the radial direction of a discoid storage medium. Since the feed screw 46 is identical along the whole length in outer diameter, the screw 46 can be inserted into a mechanical chassis 32 from its one side, and hence the feed mechanism superior in assembly workability is obtained.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a recording / reproducing head for recording and / or reproducing information on a disc-shaped recording medium such as an optical disc or a magneto-optical disc in the radial direction of the disc-shaped recording medium. The present invention relates to a feeding mechanism for moving.

[0002]

2. Description of the Related Art Conventionally, for example, a feeding mechanism of a disc recording / reproducing apparatus in which a disc such as an optical disc or a magneto-optical disc is used as a recording medium is shown in FIG.

The feeding mechanism shown in FIG. 8 is used in an optical disc reproducing apparatus using an optical disc as an information recording medium, and is provided with a feed screw 1, a mechanical chassis 2, an optical pickup 3, and a driven gear 4. . The feed screw 1 has small diameter portions 1a and 1b at both ends in the axial direction, and the screw portion 5 is provided only on the outer peripheral surface of the large diameter portion located inside thereof. This feed screw 1 has a small diameter portion 1a provided at both ends thereof,
1b is fitted in the bearing holes 2a, 2b of the mechanical chassis 2 and is rotatably supported. A driven gear 4 is press-fitted and fixed to the tip of one small diameter portion 1a penetrating one bearing hole 2a of the mechanical chassis 2.
A drive gear fixed to a rotation shaft of a motor (not shown) is connected to the motor via a reduction gear mechanism.

The feed screw 1 supported at both ends on the mechanical chassis 2 is slidably penetrated into the bearing holes 6 and 6 of the optical pickup 3, and the screw claw 7 provided on the optical pickup 3 is a feed screw. 1 is engaged with the thread portion 5. Therefore, when the feed screw 1 is rotationally driven, the screw claw 7 moves to the left and right in the axial direction according to the rotation direction,
This allows the optical pickup 3 to move in the radial direction of the optical disc.

[0005]

However, in the conventional feed mechanism as described above, the outer diameters of the small diameter portions 1a and 1b for supporting the feed screw 1 on the mechanical chassis 2 and the screw portion 5 are different. In order to improve the accuracy of the feed screw 1, it is necessary to set the concentricity of the small diameter parts 1a and 1b and the screw part 5 with high accuracy. In order to realize this, since the feed screw 1 is conventionally manufactured by cutting, not only the manufacturing of the feed screw 1 is time-consuming and expensive, but also the assembling work of the feed screw 1 is complicated. However, there is a problem that the assembly workability is poor.

The present invention has been made in view of such conventional problems, and provides a feed mechanism which can easily and inexpensively manufacture a feed screw and which is easy to assemble and is excellent in assembling workability. Is intended.

[0007]

In order to solve the above-mentioned problems and the like and to achieve the above-mentioned object, the present invention provides a feed mechanism of the present invention for recording and / or reproducing information on a disc-shaped recording medium. Recording / reproducing head, a feed screw having a spiral threaded portion with which a screw claw provided on the recording / reproducing head is engaged, a mechanical chassis for rotatably supporting the feed screw, and a drive screw for rotating the feed screw. In a feed mechanism equipped with an actuator for moving the recording / reproducing head in the radial direction of the disk-shaped recording medium, the feed screw has the same outer diameter over the entire axial length, and over the entire axial length. It is characterized by the provision of a screw part.

[0008]

The present invention has the above-mentioned configuration,
Since the feed screw can be inserted from one side of the mechanical chassis, the assembling work can be easily performed, and the feed screw can be easily and inexpensively manufactured.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 7 show an embodiment of the present invention.
2 is a perspective view of an external appearance of an optical disk reproducing apparatus to which the present invention is applied, FIG. 2 is a perspective view of a mechanical deck built in the optical disk reproducing apparatus of FIG. 1, and FIG. 3 is a mechanical chassis of the mechanical deck shown in FIG. FIG. 4 is a plan view for explaining the relationship, FIG. 4 is a cross-sectional view showing the mounting state of the feed screw, FIG. 5 is an enlarged cross-sectional view of the AA line portion of FIG. 3, and FIG. 6 is an intermediate for manufacturing the feed screw of the present invention. FIG. 7 is a sectional view of a screw shaft as a product, and FIG. 7 is a sectional view of a feed screw manufactured by subjecting FIG. 6 to a predetermined process.

The optical disk reproducing apparatus shown in FIG. 1 shows a specific example of an electronic apparatus to which the push button mechanism of the present invention is applied, and reads information recorded on a disk-shaped recording medium composed of an optical disk. Playback-only disc player device (product name: e-book player)
Is. This optical disk reproducing apparatus includes an exterior body 20 in which a mechanical deck 30 shown in FIG. 3 is incorporated, and a lid body 2 that is openably and closably connected to the exterior body 20 by a hinge 21.
2 is provided.

The exterior body 20 of this optical disk reproducing apparatus is
It is composed of a removable lower case 23 and an upper case 24 that are vertically stacked, and a large number of operation buttons 25 are exposed on the upper surface of the upper case 24. Hinge pieces 21a, 21a forming one member of the hinge 21 are attached to both ends of one side of the upper surface of the upper case 24, and the other member of the hinge 21 is provided between the hinge pieces 21a, 21a. The hinge part 21b which comprises it is interposed, and this hinge part 21b is integrally formed in one side of the cover 22.

Thus, the exterior body 20 is provided via the hinge 21.
A liquid crystal display 26 that displays information such as characters, symbols and images is attached to the inner surface of the lid 22 that is rotatably connected to the lid 22. Although not shown, the liquid crystal display 26 is a print that is housed in the exterior body 20 and supports the operation button 25 through an electrical connection unit that electrically connects the hinge portion 21b and the upper case 24. It is electrically connected to the substrate. Therefore, by rotating the lid 22 around the hinge 21, the liquid crystal display 2
While maintaining the electrical connection between 6 and the printed circuit board,
The lid 22 can be opened and closed with respect to the exterior body 20.

An opening window 27 for inserting and removing the disk cartridge 70 is provided on the side surface of the exterior body 20, and the opening window 27 is opened and closed by an opening / closing plate 28 rotatably supported by the upper case 24. It is possible. Inside the opening / closing plate 28, the insertion opening 31 of the mechanical deck 30 is arranged.
By pushing 8 to insert the disc cartridge 70 into the exterior body 20 through the opening window 27, the disc cartridge 70 is automatically mounted in the mechanical deck 30. An ejection button 29 for ejecting the disc cartridge 70 mounted on the mechanical deck 30 is provided below the opening window 27 so as to project laterally.

As shown in FIG. 3, the discharge button 29 comprises a button member 80 formed of a hollow block body and a plate-shaped spring member 81 continuously formed integrally with one side of the button member 80. It is configured. The spring member 81 of the discharge button 29 is
The button member 80 is bent at a substantially right angle in the lateral direction intersecting the front-back direction (pressing direction and returning direction). And
At the end of the spring member 81 opposite to the button member 80, a shaft-shaped stopper portion 8 having a diameter larger than the plate thickness of the spring member 81 is provided.
6 is formed. As the material of the discharge button 29,
For example, polypropylene (PP) and polyethylene (P
A synthetic resin such as E) can be applied.

In order to allow the discharge button 29 to be attached to the exterior body 20, the lower case 23 is provided with a rectangular button hole 90 through which the button member 80 can slide in and out. The button member 8 is provided on the floor surface of the lower case 23 forming the button hole 90.
The guide ridge 91 having a T-shaped cross section that engages with the central slit 82 of 0 to form a guide in the front-rear direction and prevents it from coming off in the up-and-down direction, and moves the button member 80 in the depth direction more than a predetermined amount A claw stopper 92 for blocking is provided.

Further, inside the side wall 23a of the lower case 23 from which the spring member 81 of the discharge button 29 extends, a semi-cylindrical support member 93 for slidably supporting the spring member 81 with the side wall 23a. And a pair of support protrusions 94, 94 that are set to face each other with a gap slightly wider than the plate thickness of the spring member 81, and the spring member 81 is inserted between them to slide in the longitudinal direction. It is movably supported.

As shown in FIG. 2, the mechanical deck 30 has a rectangular box-shaped mechanical chassis 32 having an open upper surface and a front surface, and a mechanical chassis 32 housed in the mechanical chassis 32 and held slidably in the front-rear direction. A slider 33 and a cartridge holder 34 housed inside the slider 33 and supported in parallel with the mechanical chassis 32 in the vertical direction are provided. Guide grooves 35 extending in the up-and-down direction are provided in front and rear (four places in total) of both side surfaces of the mechanical chassis 32, and cam pieces 36 (four pieces in total) provided on the cartridge holder 34 are provided in these guide grooves 35.
Individual pieces) are movably engaged in the vertical direction. Further, each cam piece 36 of the cartridge holder 34 is attached to the slider 33.
It is also engaged with the cam grooves 37 (total of four places) provided obliquely extending in the vertical direction.

Reference numeral 40 shown in FIG. 2 is a shutter opening lever for opening the shutter 71 of the disk cartridge 70. The shutter release lever 40 has an engagement roller 41 at the front portion 40a that engages with the notch of the shutter 71 of the inserted disk cartridge 70, and the bearing hole provided at the opposite side thereof has the upper surface of the cartridge holder 34. A shaft portion 34a provided on the above is rotatably fitted. The shutter release lever 40 is normally urged forward by the wire spring 42, and the engagement roller 41 of the front portion 40 a is located at the insertion port 31. Reference numeral 43 is an arc groove for allowing the movement of the tip portion 40a of the shutter opening lever 40.

The cartridge holder 34, to which the shutter opening lever 40 is attached, has side plates 34b, 34b surrounding the left and right side surfaces of the disk cartridge 70.
And a lower surface plate 34 that is formed continuously with these side surface plates 34b and supports the lower surface of the side of the disk cartridge 70.
c, 34c are provided. The front surface of the cartridge holder 34 has a guide surface 39a inclined upward.
However, a guide surface 39b inclined sideways is formed on the front portion of each side plate 34b, and a guide surface 39c inclined downward is formed on each bottom plate 34c. These guide surfaces 39a, 39b, 39c are provided to guide the tip of the disk cartridge 70 and facilitate insertion into the insertion opening 31.

Cartridge holder 3 having such a structure
A chucking member 38 is rotatably supported substantially in the center of the member 4 with some play. Below the chucking member 38, as shown in FIG. 3, the turntable 4 rotatably supported by the mechanical chassis 32.
4 are installed so as to face each other. An optical pickup 45, which is movably supported by the mechanical chassis 32, is configured to be able to move toward and away from the turntable 44.

One side of the optical pickup 45 is slidably engaged with a guide portion 32a provided on the mechanical chassis 32, and the other side has a feed screw 46 provided parallel to the guide portion 32a. Is rotatably inserted. The feed screw 46 can be manufactured, for example, as follows.

FIGS. 6 and 7 are for explaining the manufacturing process of the feed screw 46. FIG. 6 shows an intermediate product, which is formed by rolling a steel round bar to form a screw shaft 46a. 7 is a cross-sectional view, and FIG. 7 is a cross-sectional view of a finished product which is a feed screw 46 obtained by performing centerless grinding on the screw shaft 46a of FIG. The method of manufacturing the feed screw 46 will be described in detail below.

First, a round bar having the same outer diameter along the entire length in the axial direction is cut into a predetermined length to form a raw material shaft body, and the entire outer peripheral surface of the shaft body is thread-rolled. By
Mountains and valleys are formed over the entire length in the axial direction to form a complete threaded portion 5a. This is the screw shaft 4 as an intermediate product.
6a. Next, the screw shaft 46a is subjected to centerless grinding (or cutting) to remove only the ridge side of the screw portion 5a to form a flat portion, and to make the outer diameter of the flat surface as a reference of the optical pickup 45. Set the precision to a predetermined precision. The product produced by this is the feed screw 46 as a finished product.

The feed screw 46 manufactured in this way
As shown in FIG. 4, both ends are supported by a pair of bearing holes 32b and 32c provided in the mechanical chassis 32. The feed screw 46 is fixed to the outer side of the bearing hole 32b by an L-shaped leaf spring 51 fixed to the other bearing hole 32b.
It is biased toward the c side and is prevented from coming off by this leaf spring. A driven gear 47 is fitted and fixed to the end of the feed screw 46 on the plate spring 51 side by press fitting.
In this case, since the outer diameter of the feed screw 46 is flat, the driven gear 47 can be press-fitted. A drive gear fixed to a rotation shaft of a motor 48 is connected to the driven gear 47 via a reduction gear mechanism 49 so that power can be transmitted.

As described above, the feed screw 46 supported at both ends of the mechanical chassis 32 has a pair of bearing pieces 53 provided in the housing 52 of the optical pickup 45, and bearing holes 54 of the 53.
54 is slidably penetrated. Optical pickup 4
An elastic plate 55 having a screw claw 56 provided at the center is fixed to the housing 52 of No. 5, and the screw claw 56 is slidably engaged with the groove of the screw part 5 of the feed screw 46.
This elastic plate 55, as shown in FIG.
A fixed part 55a for fixing to the fixed part 55a and a gate-shaped arm part 55b connected to the fixed part 55a.
A screw claw 56 is formed at the center of 5b. The arm portion 55b is made flexible to give elasticity, and the spring force causes the screw claw 56 to be pressed against the screw portion 5 of the feed screw 46.

In this case, since the outer diameter of the feed screw 46 is formed to have the same diameter over the entire length, the feed screw 46 can be inserted from the side of the leaf spring 51, and therefore the feed screw 4 can be inserted.
Assembly line 6 can be carried out very easily.

Thus, by driving the motor 48, the rotational force of the drive gear is transmitted to the driven gear 47 via the reduction gear mechanism 49 to rotationally drive the feed screw 46, and the feed screw 46 is engaged. The threaded claw 56 is pressed by the thread of the feed screw 46 to move. As a result, the optical pickup 45 to which the screw claw 56 is fixed moves integrally, whereby the optical pickup 45 approaches the turntable 44 or separates from the turntable 44 depending on the rotation direction of the feed screw 46. Moving.

In the mechanical deck 30 on which the optical pickup 45 and the like are mounted, the slider 33 is in the retracted position and the upper end of the cam groove 37 of the mechanical deck 30 is in the mechanical position before the disk cartridge 70 is inserted. It is located at a position overlapping the guide groove 35 of the chassis 32. Therefore, the cartridge holder 34 having the cam piece 36 whose position is regulated by the guide groove 35 and the cam groove 37.
Is pushed up by the slider 33 and is in the upper position.

At this time, the slider 33 and the mechanical chassis 3
A return spring (not shown) is hung between the two and the hook 33 a of the stopper arm 73 rotatably supported on the back surface of the mechanical chassis 32 is engaged with the slider 33. , By this, the slider 33
The retracted state of is retained. This stopper arm 73
Is provided with an input portion 73b projecting into the mechanical chassis 32. The input portion 73b is provided with a torsion spring 74 supported by the mechanical chassis 32 when the slider 33 is retracted.
Is urged to the front side by the spring force.

From this state, the disk cartridge 70
Is inserted into the insertion opening 31 of the cartridge holder 34 and the input portion 73a is pressed by the tip thereof to rotate the stopper arm 73 rearward against the spring force of the torsion spring 74. Then, the slider 33 is disengaged, and the spring force of the return spring moves the slider 33 forward. Then, the cam groove 37 of the slider 33 moves forward, and the cam groove 37 overlapping the guide groove 35 of the mechanical chassis 32 moves to the lower end side.

As a result, the cam piece 36 is guided by the cam groove 37 to move to the lower end side, so that the cartridge holder 34 moves in parallel so as to be pulled down to the mechanical chassis 32 side. As a result, the disc cartridge 70 is mounted in the mechanical deck 30, and at this time, the shutter 71 is opened by the action of the engagement roller 11 of the shutter opening lever 40.

As a result, a part of the optical disk in the disk cartridge 70 is exposed from the opening, and the chucking member 38 supported by the cartridge holder 34 and the turntable 44 supported by the mechanical chassis 32 are exposed in the opening. Enters and the optical disc is sandwiched by both members 38 and 44, and the loading operation is completed. At this time,
An optical pickup movably mounted on the mechanical chassis 32 faces the opening of the disc cartridge 70, which enables reproduction of information recorded on the optical disc.

On the other hand, when the disk cartridge 70 is taken out from the mechanical deck 30, the eject button 29 may be pressed. In this case, when the ejection button 29 is pressed, the pressure receiving portion 33a of the slider 33 located behind the ejection button 29 is pushed in the depth direction by the ejection button 29, and the movement of the slider 33 causes the cam groove 37 to move rearward, so that the mechanical chassis The cam groove 37 overlapping the guide groove 35 of 32 moves to the upper end side. Therefore, the cam piece 36 is guided by the cam groove 37 and moves to the upper end side, whereby the cartridge holder 34 is pushed up and moves in parallel away from the mechanical chassis 32.

At the same time, the stopper arm pivots forward to engage and hold the slider 33, and the wire spring 42
The disc cartridge 70 is pushed forward to the extent that the tip portion can be pinched by the urging force of the shutter release lever 40 due to the spring force of, and the tip portion projects from the opening window 27.

The mechanical deck 30 having such a structure is elastically supported by the exterior body 20 via a plurality of vibration isolating members 50. The anti-vibration member 50 is formed by stamping a foamed plate-shaped foam material. As the material of the vibration damping member 50, for example, polyurethane foam or other foam material can be applied.

The anti-vibration member 50, which is formed by punching from such a foam material, is composed of a block body which is slightly elongated in the lateral direction, and an engaging hole extending in the lateral direction for attaching to the mechanical deck 30 is formed in the center. ing. Then, the four surfaces of the vibration isolator 50 excluding the front surface and the rear surface, that is, the upper and lower surfaces and the left and right side surfaces allow elastic deformation of the antivibration member 50 in the front-rear, left-right, and up-down directions, and have a desired spring constant. An arcuate cutout is provided to set the value.

In order to mount the vibration damping member 50 having such a structure on the mechanical deck 30, arm members 60 are provided on both front and rear sides of the mechanical chassis 32 as shown in FIGS. 2 and 3. ing. This arm member 60
Is a positioning portion 61 for positioning the anti-vibration member 50 at a predetermined position, an engagement portion 62 continuously provided at the tip of the positioning portion 61, and a engagement portion 62 continuously provided at the tip of the engagement portion 62. It is composed of the inserted insertion portion 63.

Further, the engaging portion 62 is sized and shaped so as to fit in the engaging hole of the vibration isolating member 50, and the upper and lower and left and right surfaces of the inserting portion 63 are provided with locking claws. A body 64 is provided. The vibration-proof member 50 fixed to the mechanical chassis 32 is fixed to the lower case 23 and the upper case 24 by a fixing member (not shown). This allows the mechanical chassis 32 to pass through the four vibration isolation members 50.
Are elastically supported by the exterior body 20.

The upper and lower cases 23 and 24 and the mechanical chassis 32 are preferably made of synthetic resin such as ABS resin and polyacetal (POM).
A metal material such as an aluminum alloy can also be used.
Further, as the material of the slider 33 and the cartridge holder 34, for example, a metal material such as a steel plate or a stainless alloy plate is suitable, but ABS resin or polyacetal (PO) is used.
It is also possible to use synthetic resins such as M).

Although the present invention has been described above, the present invention is not limited to the above-mentioned embodiment. For example, in the above-mentioned embodiment, an optical disk reproducing apparatus dedicated for reproducing information previously recorded on an information recording medium is provided. Although the applied example has been described, it is needless to say that the present invention can be applied to a feeding mechanism or the like for moving an optical pickup of a magneto-optical disk recording / reproducing apparatus capable of freely recording / reproducing information on / from an information recording medium. As described above, the present invention can be variously modified without departing from the spirit thereof.

[0041]

As described above, according to the feed mechanism of the present invention, the feed screw can be easily and inexpensively manufactured, and the feed screw can be inserted from one side of the mechanical chassis, which facilitates the assembly. Therefore, it is possible to provide a feeding mechanism having excellent assembling workability.

[Brief description of drawings]

FIG. 1 is an external perspective view of an optical disk reproducing device to which a feeding mechanism according to an embodiment of the present invention is applied.

2 is a perspective view showing an embodiment of a mechanical deck built in the optical disc reproducing apparatus of FIG. 1. FIG.

3 is a plan view showing an embodiment of a feeding mechanism of the present invention and showing a relationship between a mechanical deck from which the cartridge holder of FIG. 2 is removed and a discharge button.

FIG. 4 is an explanatory view showing a cross section of a main part of the feeding mechanism shown in FIG.

5 is an enlarged cross-sectional view taken along the line AA shown in FIG.

FIG. 6 is a cross-sectional view of a screw shaft which is an intermediate product for manufacturing the feed screw of the present invention.

7 is a cross-sectional view of a feed screw manufactured by subjecting the screw shaft of FIG. 6 to predetermined processing.

FIG. 8 is a cross-sectional view showing a conventional feeding mechanism.

[Explanation of symbols]

 20 Exterior Body 23 Lower Case 30 Mechanical Deck 32 Mechanical Chassis 33 Slider 34 Cartridge Holder 46 Feed Screw 51 Leaf Spring 54 Bearing Hole 55 Elastic Plate 56 Screw Claw

Claims (2)

[Claims] 1. A recording / reproducing head for recording and / or reproducing information on / from a disc-shaped recording medium, and a feed screw having a spiral screw portion with which a screw claw provided on the recording / reproducing head is engaged. In a feed mechanism including a mechanical chassis that rotatably supports the feed screw and an actuator that rotationally drives the feed screw to move the recording / reproducing head in the radial direction of the disk-shaped recording medium, the feed screw is A feed mechanism characterized in that the threaded portion is provided over the entire length in the axial direction on a shaft body having the same outer diameter over the entire length in the axial direction. 2. The feed mechanism according to claim 1, wherein the screw portion of the feed screw is a trapezoidal screw having a triangular screw with a flat tip.